U.S. patent number 9,214,118 [Application Number 14/505,145] was granted by the patent office on 2015-12-15 for display device and method for driving display device.
This patent grant is currently assigned to Japan Display Inc.. The grantee listed for this patent is Japan Display Inc.. Invention is credited to Fumitaka Gotoh, Tsutomu Harada, Amane Higashi, Kojiro Ikeda, Masaaki Kabe, Tae Kurokawa, Toshiyuki Nagatsuma, Akira Sakaigawa, Naoyuki Takasaki.
United States Patent |
9,214,118 |
Gotoh , et al. |
December 15, 2015 |
Display device and method for driving display device
Abstract
A display device includes: an image display unit that includes a
plurality of main pixels in an image display region, the image
display unit including sub-pixels; a light source that irradiates
the image display region; a light source control unit that controls
luminance of the light source; and a color information correction
processing unit that corrects first color information that is
obtained based on the luminance of the light source and an input
video signal to second color information, when color information of
at least one of a red pixel, a green pixel, and a blue pixel
included in the first color information exceeds a predetermined
threshold, the second information is corrected by degenerating
color information of the red pixel, the green pixel, and the blue
pixel, and by adding color information of the white pixel included
in the first color information based on the degenerated color
information.
Inventors: |
Gotoh; Fumitaka (Tokyo,
JP), Harada; Tsutomu (Tokyo, JP), Kabe;
Masaaki (Tokyo, JP), Kurokawa; Tae (Tokyo,
JP), Ikeda; Kojiro (Tokyo, JP), Nagatsuma;
Toshiyuki (Tokyo, JP), Sakaigawa; Akira (Tokyo,
JP), Takasaki; Naoyuki (Tokyo, JP),
Higashi; Amane (Tokyo, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
Japan Display Inc. |
Tokyo |
N/A |
JP |
|
|
Assignee: |
Japan Display Inc. (Tokyo,
JP)
|
Family
ID: |
52825803 |
Appl.
No.: |
14/505,145 |
Filed: |
October 2, 2014 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20150109350 A1 |
Apr 23, 2015 |
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Foreign Application Priority Data
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Oct 22, 2013 [JP] |
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2013-219703 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G09G
5/10 (20130101); G09G 3/3607 (20130101); G09G
2300/0452 (20130101) |
Current International
Class: |
G09G
3/36 (20060101); G09G 5/10 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2005-242300 |
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Sep 2005 |
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JP |
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2010-033009 |
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Feb 2010 |
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JP |
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2008-0062185 |
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Jul 2008 |
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KR |
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2011-0088398 |
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Aug 2011 |
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KR |
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Other References
Korean Office Action issued Jul. 20, 2015 for corresponding Korean
Application No. 10-2014-0139813. cited by applicant.
|
Primary Examiner: Faragalla; Michael
Attorney, Agent or Firm: Michael Best & Friedrich
LLP
Claims
What is claimed is:
1. A display device comprising: an image display unit that includes
a plurality of main pixels in an image display region, the image
display unit including sub--pixels that are a red pixel, a green
pixel, a blue pixel, and a white pixel; a light source that
irradiates the image display region with illumination light; a
light source control unit that controls luminance of the light
source; and a color information correction processing unit that
corrects first color information that is obtained based on the
luminance of the light source and an input video signal second
color information, wherein, when color information of at least one
of the red pixel, the green pixel, and the blue pixel included in
the first color information exceeds a predetermined threshold, the
second information is corrected by degenerating color information
of the red pixel, the green pixel, and the blue pixel and by adding
color information of the white pixel included in the first color
information based on the degenerated color information of the red
pixel, the green pixel, and the blue pixel.
2. The display device according to claim 1, wherein the color
information of the red pixel, the green pixel, and the blue pixel
included in the first color information is degenerated after the
color information of at least one of the red pixel, the green
pixel, and the blue pixel is extended.
3. The display device according to claim 1, wherein the color
information correction processing unit corrects the first color
information to the second color information while keeping a ratio
of color information of the red pixel, the green pixel, and the
blue pixel included in the first color information and degenerating
the color information.
4. The display device according to claim 1, wherein the color
information correction processing unit corrects the first color
information to the second color information by adding the sum total
of degeneration amounts of the color information of the red pixel,
the green pixel, and the blue pixel included in the first color
information to the color information of the white pixel included in
the first color information.
5. The display device according to claim 1, wherein the color
information correction processing unit corrects the first color
information to the second color information by changing an addition
amount of the color information of the white pixel included in the
first color information corresponding to a value ratio among the
red pixel, the green pixel, the blue pixel, and the white
pixel.
6. The display device according to claim 1, wherein the color
information correction processing unit corrects the first color
information to the second color information by changing an addition
amount of the color information of the white pixel included in the
first color information corresponding to an area of an image
displayed in the image display region.
7. A method for driving a display device, the method comprising:
degenerating color information of a red pixel, a green pixel, and a
blue pixel included in first color information to be displayed on a
predetermined main pixel, the first color information being
obtained based on luminance of light source and an input video
signal, when the color information of at least one of the red
pixel, the green pixel, and the blue pixel included in the first
color information exceeds a predetermined threshold; and correcting
the first color information to second color information by adding
color information of a white pixel included in the first color
information based on the degenerated color information of the red
pixel, the green pixel, and the blue pixel.
8. The method for driving a display device according to claim 7,
wherein at the degenerating, the color information of the red
pixel, the green pixel, and the blue pixel included in the first
color information is degenerated after the color information of at
least one of the red pixel, the green pixel, and the blue pixel is
extended.
9. The method for driving a display device according to claim 7,
wherein at the degenerating, the color information is degenerated
while a ratio of color information of the red pixel, the green
pixel, and the blue pixel included in the first color information
is kept.
10. The method for driving a display device according to claim 7,
wherein at the correcting, the color information correction
processing unit adds the sum total of degeneration amounts of the
color information of the red pixel, the green pixel, and the blue
pixel included in the first color information to the color
information of the white pixel included in the first color
information.
11. The method for driving a display device according to claim 7,
wherein at the correcting, an addition amount of the color
information of the white pixel included in the first color
information is changed corresponding to a value ratio among the red
pixel, the green pixel, the blue pixel, and the white pixel.
12. The method for driving a display device according to claim 7,
wherein at the correcting, an addition amount of the color
information of the white pixel included in the first color
information is changed corresponding to an area of an image
displayed in the image display region.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority from Japanese Application No.
2013-219703, filed on Oct. 22, 2013, the contents of which are
incorporated by reference herein in its entirety.
BACKGROUND
1. Technical Field
The present disclosure relates to a display device including an
image display unit in which an image display region is provided, a
method for driving the display device, and an electronic
apparatus.
2. Description of the Related Art
In recent years, RGBW-type display devices have attracted attention
that uses a white (W) pixel in addition to a red (R) pixel, a green
(G) pixel, and a blue (B) pixel (for example, refer to Japanese
Patent Application Laid-open Publication No. 2005-242300). In the
RGBW-type display device, white can be highlighted by using the
white pixel, so that light source luminance can be reduced as
compared with conventional RGB-type display devices and a
high-saturation image (also called as a high-chroma image) can be
displayed with low power consumption.
In the conventional RGBW-type display devices, to reduce the light
source luminance, image expansion processing is performed for an
input image signal to maintain value of a displayed image. In the
image expansion processing, image data of the red pixel, the green
pixel, and the blue pixel is extended corresponding to a rate of
reduction in the light source luminance, and the common portion of
the extended image data of the red pixel, the green pixel, and the
blue pixel is replaced with image data of the white pixel.
However, in the conventional RGBW-type display devices, a ratio
among the pieces of image data of the red pixel, the green pixel,
and the blue pixel may be changed before and after the image
expansion processing of the input image signal, a hue of the image
may be deteriorated to be dark, and deterioration of display
quality may be visually recognized in some cases.
For the foregoing reasons, there is a need for a display device
that can reduce the entire power consumption of the device by
reducing the light source luminance and prevent value (also called
as brightness or luminance) and a hue from being deteriorated to
reduce deterioration of display quality to be visually recognized,
a method for driving the display device, and an electronic
apparatus.
SUMMARY
According to an aspect, a display device include: an image display
unit that includes a plurality of main pixels including sub-pixels
that are a red pixel, a green pixel, a blue pixel, and a white
pixel in an image display region;
a light source that irradiates the image display region with
illumination light; a light source control unit that controls
luminance of the light source; and a color information correction
processing unit that corrects first color information to be
displayed on a predetermined main pixel that is obtained based or
the luminance of the light source and an input video signal to
second color information, when color information of at least one of
the red pixel, the green pixel, and the blue pixel included in the
first color information exceeds a predetermined threshold, by
degenerating the color information of the red pixel, the green
pixel, and the blue pixel and adding color information of the white
pixel included in the first color information based on the
degenerated color information of the red pixel, the green pixel,
and the blue pixel.
According to another aspect, a method for driving a display device,
the method includes: degenerating color information of a red pixel,
a green pixel, and a blue pixel included in first color information
to be displayed on a predetermined main pixel that is obtained
based on luminance of a light source and an input video signal when
the color information of at least one of the red pixel, the green
pixel, and the blue pixel included in the first color information
exceeds a predetermined threshold; and correcting the first color
information to second color information by adding color information
of a white pixel included in the first color information based on
the degenerated color information of the red pixel, the green
pixel, and the blue pixel.
According to another aspect, an electronic apparatus includes: a
display device including: an image display unit that includes a
plurality of main pixels including sub-pixels that are a red pixel,
a green pixel, a blue pixel, and a white pixel in an image display
region; a light source that irradiates the image display region
with illumination light; a light source control unit that controls
luminance of the light source; and a color information correction
processing unit that corrects first color information to be
displayed on a predetermined main pixel that is obtained based on
the luminance of the light source and an input video signal to
second color information, when color information of at least one of
the red pixel, the green pixel, and the blue pixel included in the
first color information exceeds a predetermined threshold, by
degenerating the color information of the red pixel, the green
pixel, and the blue pixel and adding color information of the white
pixel included in the first color information based on the
degenerated color information of the red pixel, the green pixel,
and the blue pixel; and a controller that controls the display
device.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a functional block diagram illustrating a configuration
example of a liquid crystal display device according to an
embodiment of the present disclosure;
FIG. 2 is a wiring diagram of an image display panel unit in the
liquid crystal display device illustrated in FIG. 1;
FIG. 3 is a schematic diagram of a surface light source device
according to the embodiment of the present disclosure;
FIG. 4 is a functional block diagram of surroundings of a signal
processing unit in the liquid crystal display device according to
the embodiment of the present disclosure;
FIG. 5A is an explanatory diagram illustrating a relation between
light source luminance of an RGB-type display device and a
displayed image in an image display region;
FIG. 5B is an explanatory diagram illustrating a relation between
light, source luminance of an RGBW-type display device and a
displayed image in an image display region;
FIG. 6A is a diagram illustrating an example of correction
processing of value (also called as brightness or luminance) of an
input image in a conventional RGBW-type display device;
FIG. 6B is a diagram illustrating another example of the correction
processing of the value of the input image in the conventional
RGBW-type display device;
FIG. 7A is a diagram illustrating an example of correction
processing of value of an input image in the display device
according to the embodiment;
FIG. 7B is a diagram illustrating another example of the correction
processing of the value of the input image in the display device
according to the embodiment;
FIG. 8 is a flowchart schematically illustrating a method for
driving the display device according to the embodiment;
FIG. 9 is a diagram illustrating another example of the display
device according to the embodiment;
FIG. 10 is a diagram illustrating another example of the display
device according to the embodiment;
FIG. 11 is a diagram illustrating an example of an electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 12 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 13 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 14 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 15 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 16 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 17 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 18 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 19 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 20 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 21 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 22 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure;
FIG. 23 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure; and
FIG. 24 is a diagram illustrating an example of the electronic
apparatus including the display device according to the embodiment
of the present disclosure.
DETAILED DESCRIPTION
The following describes an embodiment of the present invention in
detail with reference to the attached drawings. In the embodiment,
a liquid crystal display device is used as an example of a display
device. However, the invention can be applied to various display
devices, not only to the liquid crystal display device.
FIG. 1 is a functional block diagram illustrating a configuration
example of a liquid crystal display device according to the
embodiment. FIG. 2 is a wiring diagram of an image display panel
unit in the liquid crystal display device illustrated in FIG.
1.
As illustrated in FIG. 1, a liquid crystal display device 10
(hereinafter, simply referred to as a "display device 10" in some
cases) according to the embodiment includes a signal processing
unit 20 that receives an input signal (RGB data) from an image
output unit 11 and executes predetermined data conversion
processing to output the signal, an image display panel unit 30
that displays an image based on the output signal output from the
signal processing unit 20, an image display device drive circuit 40
that controls a display operation of the image display panel unit
30, a surface light source device 50 that irradiates an image
display region 30a (not illustrated in FIG. 1, refer to FIG. 2) of
the image display panel unit 30 with white light in a plane shape
from the back surface of the image display panel unit 30, and a
light source device control circuit (light source control unit) 60
that controls an operation of the surface light source device 50.
The configuration of the display device 10 is similar to that of a
display device assembly disclosed in Japanese Patent Application
Laid-open Publication No. 2011-154323. Various modifications
disclosed in Japanese Patent Application Laid-open Publication No.
2011-154323 can be applied to the display device 10.
The signal processing unit 20 is an arithmetic processing unit that
controls operations of the image display panel unit 30 and the
surface light source device 50. The signal processing unit 20 is
electrically coupled to the image display device drive circuit 40
that drives the image display panel unit 30 and the light source
device control circuit 60 that drives the surface light source
device 50. The signal processing unit 20 executes data processing
of the input signal (RGB data) that is input from the outside,
outputs an output signal to the image display device drive circuit
40, and generates a light source device control signal to be output
to the light source device control circuit 60.
After performing predetermined color conversion processing on input
signals (Rin, Gin, Bin) as RGB data represented by an energy ratio
among R (red), G (green), and B (blue), the signal processing unit
20 generates output signals (Rout, Gout, Bout, Wout) represented by
an energy ratio among R (red), G (green), B (blue), and W (white),
to which the fourth color W (white) is added. The signal processing
unit 20 then outputs the generated output signals (Rout, Gout,
Bout, Wout) to the image display device drive circuit 40, and
outputs the light source device control signal to the light source
device control circuit 60.
According to the embodiment, the signal processing unit 20 converts
the input signals (Rin, Gin, Bin) into the output signals (Rout,
Gout, Bout, Wout) to distribute quantity of transmitted light of
the surface light source device 50 to a fourth sub-pixel 49W of a
pixel 48 based on a W (white) component, so that the light can be
transmitted from the fourth sub-pixel 49W of which light
transmittance is the highest. Due to this, transmittance of the
entire color filter can be improved, so that quantity of light
passing through the color filter can be maintained even when the
light output from the surface light source device 50 is reduced,
and power consumption of the surface light source device 50 can be
reduced while maintaining the value of the image.
Each of the input signals (Bin, Gin, Bin) is the RGB data
indicating a specific color in the standard color gamut. Various
standards to be applied to image display can be used as the
standard color gamut. Examples thereof include, but are not limited
to, the color gamut of the sRGB standard, the color gamut of the
Adobe (registered trademark) RGB standard, and the color gamut of
the NTSC standard. The sRGB standard is defined by the
International Electrotechnical Commission (IEC). The Adobe
(registered trademark) RGB standard is defined by Adobe Systems.
The NTSC standard is defined by the National Television System
Committee.
As illustrated in FIG. 2, the image display panel unit 30 is a
color liquid crystal display device including the image display
region 30a. In the image display region 30a, the pixel 48 including
a first sub-pixel 49R for displaying a first color (red), a second
sub-pixel 49G for displaying a second color (green), a third
sub-pixel 49G for displaying a third color (blue), and the fourth
sub-pixel 49W for displaying a fourth color (white) is arranged in
a two-dimensional matrix. A first color filter for transmitting
light of the first color (red) is arranged between the first
sub-pixel 49G and a display surface of the image display panel unit
30. A second color filter for transmitting light of the second
color (green) is arranged between the second sub-pixel 49G and the
display surface of the image display panel unit 30. A third color
filter for transmitting light of the third color (blue) is arranged
between the third sub-pixel 49G and the display surface of the
image display panel unit 30. A transparent resin layer for
transmitting all colors is arranged between the fourth subpixel 49W
and the display surface of the image display panel unit 30. There
may be nothing between the fourth sub-pixel 49W and the display
surface of the image display panel unit 30.
In the example illustrated in FIG. 2, the first sub-pixel 49R, the
second sub-pixel 49G, the third sub-pixel. 49B, and the fourth
sub-pixel 49W are arranged similarly to a stripe array in the image
display panel unit 30. The configuration and arrangement of
sub-pixels included in one pixel is not specifically limited. For
example, in the image display panel unit 30, the first sub-pixel
49R, the second sub-pixel 49G, the third sub-pixel 49B, and the
fourth sub-pixel 49W may be arranged similarly to a diagonal array
(mosaic array). Alternatively, for example, they may be arranged
similarly to a delta array (triangle array), a rectangle array, or
the like. Generally, the arrangement similar to a stripe array is
suitable for displaying data and character strings in a personal
computer and the like. In contrast, the arrangement similar to a
mosaic array is suitable for displaying a natural image in a video
camera recorder, a digital still camera, and the like.
The image display device drive circuit 40 includes a signal output
circuit 41 (signal output unit) and a scanning circuit 42. The
signal output circuit 41 is electrically coupled to each sub-pixel
in each pixel 48 of the image display panel unit 30 via wiring
diode-transistor logic (DTL). The signal output circuit 41 outputs
a driving voltage to be applied to a liquid crystal included in
each sub-pixel based on the output signals (Rout, Gout, Bout, Wout)
output from the signal processing unit 20, and controls
transmittance of light emitted from the surface light source device
50 for each pixel 48. The scanning circuit 42 is electrically
coupled, via wiring switch control logic (SCL), to a switching
element for controlling an operation of each sub-pixel in each
pixel 48 of the image display panel unit 30. The scanning circuit
42 sequentially outputs scanning signals to a plurality of pieces
of wiring SCL, and applies each of the scanning signals to the
switching element of the sub-pixel in each pixel 48 to turn ON the
switching element. The signal output circuit 41 applies the driving
voltage to the liquid crystal included in the sub-pixel to which
the scanning signal from the scanning circuit 42 is applied. In
this way, an image is displayed on the entire image display region
30a of the image display panel unit 30.
The surface light source device 50 is a backlight including various
light sources and arranged on the back surface of the image display
panel unit 30. The surface light source device 50 illuminates the
image display panel unit 30 by emitting light from the light source
to the image display panel unit 30.
The light source device control circuit 60 controls lighting
quantity and/or a load of the light source in the surface light
source device 50 based on the light source device control signal
output from the signal processing unit 20, and adjusts an amount of
light and intensity of light emitted from the surface light source
device 50 to the image display panel unit 30. The light source
device control circuit 60 can also control the light source and the
intensity of light by controlling the lighting quantity and/or the
load of part of the light sources.
FIG. 3 is a schematic diagram of the surface light source device 50
according to the embodiment. As illustrated in FIG. 3, the surface
light source device 50 includes a light guide plate 52 and a light
source 54 arranged in the vicinity of an end face of the light
guide plate 52. The light, source 54 includes five light-emitting
diodes (LEDs) 54a to 54e as point light sources arranged at
predetermined intervals along one direction. An optical sheet and
the like (not illustrated) are arranged on an emitting surface side
of the light guide plate 52, a reflective sheet (not illustrated)
is arranged on a surface opposed to the emitting surface of the
light guide plate 52. The five LEDs 54a to 54e are electrically
coupled to the light source device control circuit 60. The light
guide plate 52 guides the light emitted from the five LEDs 54a to
54e to the inside via the end face, and emits the light guided to
the inside toward the image display panel unit 30 from a principal
plane. In the example of the embodiment, the light source 54
includes the five LEDs 54a to 54e. Alternatively, the number of
LEDs 54a to 54e included in the light source 54 may be
appropriately modified. The light source 54 is not limited to the
LEDs 54a to 54e, and may be configured using various point light
sources and line light sources.
Next, the following describes signal processing in the display
device 10 according to the embodiment in detail with reference to
FIG. 4. FIG. 4 is a functional block diagram of surroundings of the
signal processing unit 20 in the display device 10 according to the
embodiment. As illustrated in FIG. 4, the signal processing unit 20
of the liquid crystal display device 10 according to the embodiment
includes an .alpha.-value generation unit 21, a color information
generation unit 22, and a color information correction processing
unit 23.
The input, signals (Rin, Gin, Bin) including a video signal (RGB
data) represented by 8 bits (0 to 255) are input to the
.alpha.-value generation unit 21 from the outside. The
.alpha.-value generation unit 21 calculates an expansion
coefficient .alpha. of the input RGB data, and calculates 1/.alpha.
based on the calculated expansion coefficient .alpha.. The
.alpha.-value generation unit 21 outputs the calculated expansion
coefficient .alpha. and 1/.alpha. to the color information
generation unit 22 together with the input signals as output
signals.
The color information generation unit 22 generates a light source
device control signal (BLPWM) for controlling luminance of the
light source 54 based on the input signals input from the
.alpha.-value generation unit 21, and outputs the generated light
source device control signal to the light source device control
circuit 60.
The color information generation unit 22 performs linear conversion
as reverse .gamma. correction on the input RGB data. When the input
signal is the RGB data represented by 8 bits (0 to 255), for
example, the color information generation unit 22 normalizes each
value of an R component, a G component, and a B component of the
RGB data to be a value of 0 to 1. The color information generation
unit 22 calculates, with respect to the normalized RGB data, RGBW
data including data of the W (white) component for driving the
fourth sub-pixel 49W in the main pixel 48.
When the input signals (Rin, Gin, Bin) and the output signals
(Rout, Gout, Bout) are the RGB data represented by 8 bits (0 to
255), for example, the color information generation unit 22
converts the generated RGBW data into 8-bit data similarly to the
input signals and the output signals. The color information
generation unit 22 then executes .gamma. correction processing with
a .gamma. value (for example, .gamma.=2.2) of the input signal on
which .gamma. correction is performed, and calculates the output
signals (Rout, Gout, Bout, Wout) of the .gamma.-corrected RGBW
data.
The color information generation unit 22 extends the RGB data of
the input signals based on the following expressions (1) to (3)
corresponding to the luminance of the light source 54, and
calculates the extended RGB data (R', G', B'). R'=Gain.times.Rin
expression (1) G'=Gain.times.Gin expression (2) B'=Gain.times.Bin
expression (3)
(in the expressions (1) to (3), Gain represents an inverse number
of a light source luminance ratio.)
The color information generation unit 22 calculates the output
signal of the first sub-pixel 49R based on the input signal of the
first sub-pixel 49R, the expansion coefficient .alpha., and the
output signal of the fourth sub-pixel 49W. The color information
generation unit 22 calculates the output signal of the second
sub-pixel 49G based on the input signal of the second sub-pixel
49G, the expansion coefficient .alpha., and the output signal of
the fourth sub-pixel 49W. The color information generation unit 22
calculates the output signal of the third sub-pixel 49B based on
the input signal of the third sub-pixel 49B, the expansion
coefficient .alpha., and the output signal of the fourth sub-pixel
49W. The color information generation unit 22 generates the
calculated output signals of the first sub-pixel 49R, the second
sub-pixel 49G, the third sub-pixel 49B, and the fourth sub-pixel
49W, and outputs the generated output signals of the RGBW data
(first color information) to the color information correction
processing unit 23.
The color information correction processing unit 23 determines
whether image data of at least one or the first sub-pixel 49R, the
second sub-pixel 49G, and the third sub-pixel 49B included in the
RGBW data input from the color information generation unit 22
exceeds an expressible range (D_max) that is a predetermined
threshold of the display device 10. When the image data of at least
one of the first sub-pixel 49R, the second sub-pixel 49G, and the
third sub-pixel 49B exceeds the expressible range, the color
information correction processing unit 23 calculates a rate of
excessive amount of the data exceeding the expressible range with
respect to the expressible range. The predetermined threshold of
the display device 10 is not necessarily limited to the expressible
range, and may be appropriately modified.
Specifically, the information correction processing unit 23
calculates an excessive rate (D_over) of the extended image data
(R', G', B') with respect to the maximum display range (D_max) of
the display device 10 based on the following expression (4).
D_over=MAX(R', G', B')/D_max expression (4)
The color information correction processing unit 23 degenerates
each piece of the data of the first sub-pixel 49R, the second
sub-pixel 49G, and the third sub-pixel 49B corresponding to the
calculated excessive rate. The color information correction
processing unit 23 adds the sum total of degeneration amounts of
pieces of image data of the first sub-pixel 49R, the second
sub-pixel 49G, and the third sub-pixel 49B to the image data of the
fourth sub-pixel 49W to be corrected RGBW data (second color
information). Accordingly, the ratio among the first sub-pixel 49R,
the second sub-pixel 49G, and the third sub-pixel 49B is not
changed and the image data of the fourth sub-pixel 49W can be
added, so that high saturation and high value can be achieved even
when luminous intensity of the light source is reduced. The image
data to be added to the fourth sub-pixel 49W is not necessarily
limited to the sum total of the degeneration amounts of pieces of
the image data of the first sub-pixel 49R, the second sub-pixel
49G, and the third sub-pixel 49B, and may be appropriately
modified.
Specifically, when the extended image data exceeds the maximum
display range of the display device 10, the color information
correction processing unit 23 uses image data (R'', G'', B''),
which is the image data degenerated to be within the expressible
range, as RGB output signals (Rout, Gout, Bout) based on the
following expressions (5) to (7). When the extended image data does
not exceed the maximum display range of the display device 10, the
color information correction processing unit 23 uses the extended
image data (R', G', B') as the RGB output signals (Rout, Gout,
Bout) as it is. R''=R'/D_over expression (5) G''=G'/D_over
expression (6) B''=B'/D_over expression (7)
Subsequently, when the extended image data exceeds the maximum
display range, the color information correction processing unit 23
calculates the excessive amounts (R_over, G_over, B_over) based on
the following expressions (8) to (10). When the extended image data
does not exceed the maximum display range, the color information
correction processing unit 23 sets the excessive amount to 0.
R_over=R'-R'' expression (8) G_over=G'-G'' expression (9)
B_over=B'-B'' expression (10)
The color information correction processing unit 23 then converts
the calculated excessive amount into value to he allocated to an
output (Wout) of the fourth sub-pixel 49W based on the following
expression (11).
W_out=(R_over.times.R.sub.--Y+G_over.times.G.sub.--Y+B_over.times.B-
.sub.--Y)/W_Y expression (11)
(In the expression (11), R_Y represents a value ratio of an R
pixel, G_Y represents a value ratio of a G pixel, B_Y represents a
value ratio of a B pixel, and W_Y represents a value ratio of a W
pixel.)
The functions of the .alpha.-value generation unit 21, the color
information generation unit 22, and the color information
correction processing unit 23 may be implemented by hardware or
software, and are not specifically limited. Even if each component
of the signal processing unit 20 is configured by hardware, each
circuit does not need to be physically and independently
distinguished from each other, and a plurality of functions may be
implemented by a physically single circuit.
The following describes a relation between light source luminance
and a displayed image in the image display region 30a of the
RGB-type display device and the RGBW-type display device with
reference to FIG. 5A and FIG. 5B, FIG. 5A is an explanatory diagram
illustrating a relation between the light source luminance and the
displayed image in the image display region 30a of the RGB-type
display device 10, and FIG. 5B is an explanatory diagram
illustrating a relation between the light source luminance and the
displayed image in the image display region 30a of the RGBW-type
display device 10.
As illustrated in FIG. 5A, in the conventional RGB-type display
device, when the light source luminance is reduced from 100% to
70%, luminance of a white screen on the background of the image
display region 30a can be kept constant. A yellow high-saturation
image G1 (red (R) pixel: 255, green (G) pixel: 255) displayed in a
part of the image display region 30a is caused to be a
high-saturation intermediate-value image G2 because the value is
reduced and darkening is caused due to the reduction in the light
source luminance.
Accordingly, as illustrated in FIG. 5B, when the light source
luminance is reduced from 100% to 70% in the RGBW-type display
device according to the present disclosure, a white (W) pixel: 103
is added to a yellow high-saturation image G3 (red (R) pixel: 255,
green (G) pixel: 255) corresponding to a reduction amount of the
light source luminance. Accordingly, the value of the
high-saturation high-value image G3 as the input image is
compensated with the white pixel even if the light source luminance
thereof is reduced, so that a high-saturation high-value image G4
can be maintained.
Next, the following describes correction processing of the input
image in the conventional RGBW-type display device in detail with
reference to FIG. 6 and FIG. 6B. FIG. 6A is a diagram illustrating
an example of the correction processing of the value of the input
image in the conventional RGBW-type display device, and FIG. 6B is
a diagram illustrating another example of the correction processing
of the value of the input image in the conventional RGBW-type
display device.
FIG. 6A illustrates an example of the correction processing in
which the input image data includes red(R) green (G), and blue (B)
components. In this case, after light source (BL) luminance is
reduced from 100% to 50% in the expressible range (D_max) with
respect to the input image data, the image data including the red
(R), the green (G), and the blue (B) components is extended
corresponding to the reduction amount of the light source luminance
to keep the value of the image. As a result, the red (R), the green
(G), and the blue (B) components included in the image data become
red (R'), green (G'), and blue (B') components, each of which is
extended by 2 times. Regarding the red (R') component, an excess
part exceeding the expressible range is generated.
Subsequently, the common portion of the extended data of the red
(R'), the green (G'), and the blue (B') components is replaced with
a white (W) component. Due to this, each piece of the data of the
red (R'), the green (G'), and the blue (B') components is reduced,
and reduction of the light source luminance can be compensated with
the added white (W) component. Finally, the excess part exceeding
the expressible region of the image data of the red (R') component
is cut off to be within the expressible range (D_max), and the
correction processing is finished.
FIG. 6B illustrates an example of the correction processing in
which the input image data includes the red (R) and the green (G)
components. In this case, after the light source (BL) luminance is
reduced from 100% to 85% in the expressible range (D_max) with
respect to the input image data, the image data including the red
(R) and the green (G) components is extended corresponding to the
reduction amount of the light source luminance to keep the value of
the image. Accordingly, the red (R) and the green (G) components
included in the image data become the red (R') and the green (G')
components, each of which is extended by 1.25 times, so that the
reduction of the light source luminance can be compensated.
Finally, the excess part exceeding the expressible range of the red
(R') component that is generated in the expansion processing is cut
off to be within the expressible range (D_max), and the correction
processing is finished.
As described above, in the conventional RGBW-type display device,
the correction processing is performed for cutting off the excess
part of the red (R), the green (G), and the blue (B) image data
generated in the expansion processing of the input image data, the
excess part exceeding the expressible range of the display device.
Due to this, although it is possible to compensate the reduction in
value caused by the reduction in light source luminance in the
expansion processing, the ratio among the pieces of input image
data of red (R), green (G), and blue (B) may be changed to cause
change in a hue and the like before and after the expansion
processing. FIG. 6A and FIG. 6B illustrate an example of such a
case. Accordingly, in the embodiment, the correction processing is
performed to maintain the ratio among the pieces of image data of
red (R), green (G), and blue (B) as follows.
Next, the following describes the correction processing of the
input image in the display device according to the embodiment in
detail with reference to FIG. 7A and FIG. 7B. FIG. 7A is a diagram
illustrating an example of the correction processing of the input
image in the display device according to the embodiment, and FIG.
7B is a diagram illustrating another example of the correction
processing of the input image in the display device according to
the embodiment.
FIG. 7A illustrates an example of the correction processing in
which the input image data includes the red (R), the green (G), and
the blue (B) components. In this case, the color information
generation unit 22 reduces the light source (BL) luminance from
100% to 50% in the expressible range (D_max) with respect to the
input image data, and extends the image data including the red (R),
the green (G), and the blue (B) components corresponding to the
reduction amount of the light source luminance to keep the value of
the image. As a result, the red (R), the green (G), and the blue
(B) components included in the image data become the red (R'), the
green (G'), and the blue (B') components, each of which is extended
by 2 times. Regarding the red (R') component, an excess part
exceeding the expressible range is generated.
Subsequently, the color information generation unit 22 replaces the
common portion of the extended image data of the red (R'), the
green (G'), and the blue (B') components with the white (W)
component, generates the RGBW data (first color information.), and
outputs the generated RGBW data to the color information correction
processing unit 23.
The color information correction processing unit 23 then calculates
an excessive rate of the red (R') component data with respect to
the expressible region. Subsequently, the color information
correction processing unit 23 degenerates the image data of the red
(R'), the green (G'), and the blue (B') components to be the image
data of red (R''), green (G''), and blue (B'') components based on
the calculated excessive rate, adds the sum total of pieces of the
degenerated image data of red (B''), green (G'), and blue (B') to
the white (W) component to be corrected RGBW data (second color
information) including the red (R''), the green (G''), the blue
(B''), and white (W) components, and the correction processing is
finished.
FIG. 7B illustrates an example of the correction processing in
which the input image data includes the red (R) and the green (G)
components. In this case, the color information generation unit 22
reduces the light source (BL) luminance from 100% to 85% in the
expressible range (D_max) with respect to the input image data, and
extends the image data including the red (R) and the green (G)
components corresponding to the reduction amount of the light
source luminance to keep the value of the image. Accordingly, the
red (R) and the green (G) components included in the image data
become the red (R') and the green (G') components, each of which is
extended by 1.25 times. Regarding the red (R') component, an excess
part exceeding the expressible range is generated.
Subsequently, the color information generation unit 22 replaces the
common portion of the extended image data of the red (R'), the
green (G'), and the blue (B') components with the white (W)
component, generates the RGBW data (first color information), and
outputs the generated RGBW data to the color information correction
processing unit 23.
The color information correction processing unit 23 then calculates
an excessive rate of the red (R') component data with respect to
the expressible region. Subsequently, the color information
correction processing unit 23 degenerates the image data of the red
(R') and the green (G') components to be the image data of the red
(R'') and the green (G'') components based on the calculated
excessive rate, adds the sum total of pieces of the degenerated
image data of red (R') and green (G') to the white (W) component to
be the corrected RGBW data (second color information) including the
red (R''), the green (G''), and the white (W) components, and the
correction processing is finished.
As described above, the color information correction processing
unit 23 generates the corrected RGBW data from the RGBW data input
through the color information generation unit 22 such that all
pieces of image data of red (R'), the green (G'), and the blue (B')
are within the expressible range and the white (W) is further
increased while maintaining the ratio among the pieces of image
data of red (R'), green (G'), and blue (B'). Accordingly, the ratio
among red (R), green (G), and blue (B) in the input image data is
maintained and the input image data can be corrected to image data
to which white (W) replaced in the image expansion processing is
added, so that it is possible to prevent deterioration of the
display quality to be visually recognized that is caused by the
deterioration of the hue of the image even when the light source
luminance is reduced to reduce the entire power consumption of the
display device 10.
Next, the following describes a method for driving the display
device according to the embodiment. The method for driving the
display device according to the embodiment includes a first step
for degenerating color information of the first sub-pixel 49R, the
second sub-pixel 49G, and the third sub-pixel 49B included in the
first color information (RGBW data before correction) to be
displayed on the predetermined main pixel 48, which is obtained
based on the luminance of the light source and the input video
signal, when the color information of at least one of the first
sub-pixel 49B, the second sub-pixel 49B, and the third sub-pixel
49B exceeds the predetermined threshold, and a second step for
correcting the first color information to the second color
information (corrected RGBW data) by adding color information of
the fourth sub-pixel 49W included in the first color information
thereto based on the degenerated color information of the first
sub-pixel 49R, the second sub-pixel 49G, and the third sub-pixel
49B.
FIG. 8 is a flowchart schematically illustrating the method for
driving the display device according to the embodiment. As
illustrated in FIG. 8, first, the .alpha.-value generation unit 21
calculates the expansion coefficient .alpha. based on the input
image signal, and calculates 1/.alpha. based on the calculated
.alpha. (Step S1). Subsequently, the color information generation
unit 22 generates a light source device control signal based on the
input signal and outputs the signal to the light source device
control circuit 60. The color information generation unit 22 then
extends the image data of the first sub-pixel 49R, the second
sub-pixel 49G, and the third sub-pixel 49B based on the light
source luminance, and replaces the image data common to the first
sub-pixel 49R, the second sub-pixel 49G, and the third sub-pixel
49B with the fourth sub-pixel 49W to generate the RGBW data (first
color information). The color information generation unit 22
outputs the generated RGBW data to the color information correction
processing unit 23.
Next, the color information correction processing unit 23
determines whether the image data of at least one of the first
sub-pixel 49R, the second sub-pixel 49G, and the third sub-pixel
49B included in the RGBW data exceeds the predetermined threshold
(Step S2). The predetermined threshold herein means, for example,
the maximum expressible range of the display device 10, that is,
255 in a case of 8-bit image data. If the image data of at least
one of the first sub-pixel 49R, the second sub-pixel 49G, and the
third sub-pixel 49B exceeds the predetermined threshold (Yes at
Step S2), the color information correction processing unit 23
calculates an excessive amount of the image data of the first
sub-pixel 49R, the second sub-pixel 49G, and the third sub-pixel
49B exceeding the threshold (Step S3). The color information
correction processing unit 23 degenerates the excessive amount of
the first sub-pixel 49R, the second sub-pixel 49G, and the third
sub-pixel 49B in the RGBW data based on the calculated excessive
amount, and converts the data into the RGBW data to which the image
data of the fourth sub-pixel 49W is added based on the calculated
excessive amount (Step S4).
The color information correction processing unit 23 corrects the
data to the corrected RGBW data (second color information) based on
the converted RGBW data (Step 35). Finally, the color information
correction processing unit 23 outputs the corrected RGBW data as an
output signal to a screen display panel unit 30.
If the image data of at least one of the first sub-pixel 49R, the
second sub-pixel 49G, and the third sub-pixel 49B is equal to or
smaller than the predetermined threshold (No at Step S2), the color
information correction processing unit 23 does not calculate the
excessive amount of the first sub-pixel 49R, the second sub-pixel
49G, and the third sub-pixel 49B. In this case, the color
information correction processing unit 23 outputs, as the output
signal, the image data of the first sub-pixel 49R, the second
sub-pixel 49G, the third sub-pixel 49B, and the fourth sub-pixel
49W input from the color information generation unit 22 as the RGBW
data (second color information) to the image display panel unit
30.
In the above embodiment, the color information correction
processing unit 23 corrects the image data of the white pixel to
keep the same value as that of the input image data. However, a
correction amount of the image data of the white pixel can be
arbitrarily set. For example, by causing the correction amount of
the white pixel to be widely variable, the color information
correction processing unit 23 may perform correction processing so
as to keep only the ratio of the RGB data without correcting the
image data of the white pixel from the state in which the image
data of the white pixel is corrected to keep the same value as that
of the input image data.
For example, as illustrated in FIG. 9, under the condition that the
value ratio of red (R):green (G):blue (B):white (W) is
18:72:10:150, the color information correction processing unit 23
may set an addition amount of the white (W) pixel to be 50% of the
maximum addition amount considering the value ratio between green
(G) and white (W). In this case, the addition amount of the white
having the value that is substantially two times that of the green
(G) is caused to be about half of the green (G), so that the
corrected image can be prevented from being whitened.
In the embodiment described above, the color information correction
processing unit 23 uniformly adds the white (W) pixel to the RGBW
data in the image display region of all high-saturation images in
the image display region 30a. However, the addition amount of the
white (W) pixel to the RGBW data may be appropriately modified
corresponding to an area of the displayed image.
For example, the color information correction processing unit 23
may provide a predetermined threshold for an area of the
high-saturation image, and perform correction processing by
reducing the addition amount of the image data of the white pixel
when the area of the high-saturation image exceeds the threshold.
In the example illustrated in FIG. 10, a partial region A2 that is
half of the area of an image display region A1 is set as a
threshold of an area of a correction region. In this case, to
correct the entire part of the image display region A1 exceeding
the partial region A2, the color information correction processing
unit 23 may reduce the addition amount of the image data of the
white pixel as compared with a case of correcting the partial
region A2. Accordingly, the area of the image display region 30a to
which the white pixel is added is reduced, so that it is possible
to prevent color fading accompanying with increase of the white
light.
As described above, with the display device 10 according to the
embodiment, the color information correction processing unit 23
degenerates the RGB data based on the excessive amount of the image
data of RGB included in the RGBW data with respect to the
expressible range, and adds W data corresponding to the degenerated
RGB data. Accordingly, it is possible to provide the display device
10 that can prevent deterioration of the display quality to be
visually recognized caused by the deterioration of the value and
the hue even when the luminance of the LEDs 54a to 54e is reduced
to reduce the entire power consumption of the display device 10,
and the method for driving the display device 10.
Specifically, according to the embodiment, deterioration of both
the value and the hue of the image can be prevented by degenerating
the RGB data at a constant ratio and adding the sum total of the
degeneration amounts to the W data. Due to this, the effects
described above can be more remarkably exhibited.
Next, the following describes an electronic apparatus including the
display device 10 according to the embodiment and a controller for
controlling the display device 10 with reference to FIG. 11 to FIG.
24. FIG. 11 to FIG. 24 are diagrams illustrating an example of the
electronic apparatus including the display device 10 according to
the embodiment. The display device 10 can be applied to electronic
apparatuses in various fields such as a television apparatus, a
digital camera, a notebook-type personal computer, portable
terminal devices including a mobile phone, or a video camera. In
other words, the display device 10 can be applied to electronic
apparatuses in various fields that display a video signal input
from the outside or a video signal generated inside as an image or
video.
Application Example 1
The electronic apparatus illustrated in FIG. 11 is a television
apparatus to which the display device 10 is applied. The television
apparatus includes, for example, a video display screen unit 510
including a front panel 511 and a filter glass 512. The display
device 10 is applied to the video display screen unit 510. A screen
of the television apparatus has a function for detecting a touch
operation, in addition to a function for displaying an image.
Application Example 2
The electronic apparatus illustrated in FIG. 12 and FIG. 13 is a
digital camera to which the display device 10 is applied. The
digital camera includes, for example, a flash light-emitting unit
521, a display unit 522, a menu switch 523, and a shutter button
524. The display device 10 is applied to the display unit 522.
Accordingly, the display unit 522 of the digital camera has a
function for detecting a touch operation, in addition to a function
for displaying an image.
Application Example 3
The electronic apparatus illustrated in FIG. 14 represents an
external appearance of a video camera to which the display device
10 is applied. The video camera includes, for example, a main body
531, a lens 532 for photographing a subject arranged on a front
side of the main body 531, a start/stop switch 533 in
photographing, and a display unit 534. The display device 10 is
applied to the display unit 534. Accordingly, the display unit 534
of the video camera has a function for detecting a touch operation,
in addition to a function for displaying an image.
Application Example 4
The electronic apparatus illustrated in FIG. 15 is a notebook-type
personal computer to which the display device 10 is applied. The
notebook-type personal computer includes, for example, a main body
541, a keyboard 542 for an input operation of characters and the
like, and a display unit 543 for displaying an image. The display
device 10 is applied to the display unit 543. Accordingly, the
display unit 543 of the notebook-type personal computer has a
function for detecting a touch operation, in addition to a function
for displaying an image.
Application Example 5
The electronic apparatus illustrated in FIG. 16 to FIG. 22 is a
mobile phone to which the display device 10 is applied. The mobile
phone is, for example, configured by connecting an upper housing
551 and a lower housing 552 with a connecting part (hinge part)
553, and includes a display unit 554, a sub-display unit 555, a
picture light 556, and a camera 557. The display device 10 is
mounted as the display unit 554. Accordingly, the display unit 554
of the mobile phone has a function for detecting a touch operation,
in addition to a function for displaying an image.
Application Example 6
The electronic apparatus illustrated in FIG. 23 is a mobile phone,
that is, what is called a smartphone, to which the display device
10 and the like are applied. The mobile phone includes, for
example, a touch panel 562 arranged on a surface of a substantially
rectangular thin-plate housing 561. The touch panel 562 includes
the display device 10 and the like.
Application Example 7
The electronic apparatus illustrated in FIG. 24 is a meter unit
mounted on a vehicle. A meter unit (electronic apparatus) 570
illustrated in FIG. 24 includes a plurality of liquid crystal
display devices 571 such as a fuel gauge, a water-temperature
gauge, a speedometer, and a tachometer. The liquid crystal display
devices 571 are all covered with one exterior panel 572.
Each of the liquid crystal display devices 571 illustrated in FIG.
24 is configured by combining a liquid crystal panel 573 as liquid
crystal display means and a movement mechanism as analog display
means. The movement mechanism includes a motor as driving means and
an indicator 574 rotated by the motor. As illustrated in FIG. 24,
in the liquid crystal display device 571, a scale and a warning can
be displayed on a display surface of the liquid crystal panel 573,
and the indicator 574 of the movement mechanism can be rotated on
the display surface side of the liquid crystal panel 573. The
display device 10 according to the embodiment is applied to the
liquid crystal display device 571.
In FIG. 24, the liquid crystal display devices 571 are arranged in
one exterior panel 572. However, the embodiment is not limited
thereto. Alternatively, one liquid crystal display device may be
provided in a region surrounded by the exterior panel to display a
fuel gauge, a water-temperature gauge, a speedometer, a tachometer,
and the like on the liquid crystal display device.
According to the embodiment, the present invention discloses the
following display device, method for driving the display device,
and electronic apparatus.
A display device including: an image display unit that includes a
plurality of main pixels in an image display region, the image
display unit including sub-pixels that are a red pixel, a green
pixel, a blue pixel, and a white pixel; a light source that
irradiates the image display region with illumination light; a
light source control unit that controls luminance of the light
source; and a color information correction processing unit that
corrects first color information that is obtained base on the
luminance of the light source and an input video signal to second
color information, wherein, when color information of at least one
of the red pixel, the green pixel, and the blue pixel included in
the first color information exceeds a predetermined threshold, the
second information is corrected by degenerating color information
of the red pixel, the green pixel, and the blue pixel and by adding
color information of the white pixel included in the first color
information used on the degenerated color information of the red
pixel, the green pixel, and the blue pixel.
The above-described display device, wherein the color information
of the red pixel, the green pixel, and the blue pixel included in
the first color information is degenerated after the color
information of at least one of the red pixel, the green pixel, and
the blue pixel is extended.
The above-described display device, wherein the color information
correction processing unit corrects the first color information to
the second color information while keeping a ratio of color
information of the red pixel, the green pixel, and the blue pixel
included in the first color information and degenerating the color
information.
The above-described display device, wherein the color information
correction processing unit corrects the first color information to
the second color information by adding the sum total of
degeneration amounts of the color information of the red pixel, the
green pixel, and the blue pixel included in the first color
information to the color information of the white pixel included in
the first color information.
The above-described display device, wherein the color information
correction processing unit corrects the first color information to
the second color information by changing an addition amount of the
color information of the white pixel included in the first color
information corresponding to a value ratio among the red pixel, the
green pixel, the blue pixel, and the white pixel.
The above-described display device, wherein the color information
correction processing unit corrects the first color information to
the second color information by changing an addition amount of the
color information of the white pixel included in the first color
information corresponding to an area of an image displayed in the
image display region.
A method for driving a display device including: degenerating color
information of a red pixel, a green pixel, and a blue pixel
included in first color information to be displayed on a
predetermined main pixel, the first color information being
obtained based on luminance of a light source and an input video
signal, when the color information of at least one of the red
pixel, the green pixel, and the blue pixel included in the first
color information exceeds a predetermined threshold; and correcting
the first color information to second color information by adding
color information of a white pixel included in the first color
information based on the degenerated color information of the red
pixel, the green pixel, and the blue pixel.
The above-described method for driving the display device, wherein
at the degenerating, the color information of the red pixel, the
green pixel, and the blue pixel included in the first color
information is degenerated after the color information of at least
one of the red pixel, the green pixel, and the blue pixel is
extended.
The above-described method for driving the display device, wherein
at the degenerating, the color information is degenerated while a
ratio of color information of the red pixel, the green pixel, and
the blue pixel included in the first color information is kept.
The above-described method for driving the display device, wherein
at the correcting, the color information correction processing unit
adds the sum total of degeneration amounts of the color information
of the red pixel, the green pixel, and the blue pixel included in
the first color information to the color information of the white
pixel included in the first color information.
The above-described method for driving the display device, wherein
at the correcting, an addition amount of the color information of
the white pixel included in the first color information is changed
corresponding to a value ratio among the red pixel, the green
pixel, the blue pixel, and the white pixel.
The above-described method for driving the display device, wherein
at the correcting, an addition amount of the color information of
the white pixel included in the first color information is changed
corresponding to an area of an image displayed in the image display
region.
An electronic apparatus including: the above-described display
device; and a controller that controls the display device.
The present invention provides the display device that can reduce
the entire power consumption of the device by reducing the light
source luminance and prevent value and a hue from being
deteriorated to reduce deterioration of the display quality to be
visually recognized, the method for driving the display device, and
the electronic apparatus.
* * * * *