U.S. patent application number 15/288601 was filed with the patent office on 2017-01-26 for image display system and method of driving the same.
The applicant listed for this patent is SAMSUNG DISPLAY CO., LTD.. Invention is credited to YUNKI BAEK, JAEMIN HA, HEESOON JEONG, GIGEUN KIM, KYOUNGWON LEE, WON SIK OH, CHEOLWOO PARK, JINHO PARK.
Application Number | 20170025058 15/288601 |
Document ID | / |
Family ID | 49379776 |
Filed Date | 2017-01-26 |
United States Patent
Application |
20170025058 |
Kind Code |
A1 |
OH; WON SIK ; et
al. |
January 26, 2017 |
IMAGE DISPLAY SYSTEM AND METHOD OF DRIVING THE SAME
Abstract
An image display system includes a camera part and an image
display part. The image display part includes a user analyzer, a
gamma corrector, a gamma voltage generator, and a display panel.
The camera part takes a picture of a user and generates a user
image signal. The user analyzer calculates the user's viewing
direction based on the user image signal. The gamma corrector
generates a correction gamma value based on the viewing direction.
The gamma voltage generator generates a gamma voltage based on the
correction gamma value, and the display panel displays an image
corresponding to the gamma voltage. Accordingly, the image display
system provides the image having an optimized gamma curve to the
user in real time even without a separate input from the user.
Inventors: |
OH; WON SIK; (SEOUL, KR)
; BAEK; YUNKI; (SUWON-SI, KR) ; PARK; JINHO;
(SUWON-SI, KR) ; KIM; GIGEUN; (SEOUL, KR) ;
PARK; CHEOLWOO; (SUWON-SI, KR) ; LEE; KYOUNGWON;
(YONGIN-SI, KR) ; JEONG; HEESOON; (SUWON-SI,
KR) ; HA; JAEMIN; (YONGIN-SI, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAMSUNG DISPLAY CO., LTD. |
YONGIN-SI |
|
KR |
|
|
Family ID: |
49379776 |
Appl. No.: |
15/288601 |
Filed: |
October 7, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13613660 |
Sep 13, 2012 |
9478161 |
|
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15288601 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G09G 2320/0673 20130101;
H04N 5/202 20130101; G06K 9/00255 20130101; G09G 3/2092 20130101;
G09G 2320/028 20130101; G09G 3/3611 20130101; G09G 2354/00
20130101; G09G 2320/0626 20130101 |
International
Class: |
G09G 3/20 20060101
G09G003/20; H04N 5/202 20060101 H04N005/202; G06K 9/00 20060101
G06K009/00; G09G 3/36 20060101 G09G003/36 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 18, 2012 |
KR |
10-2012-0040401 |
Claims
1. An image display system comprising: a camera part configured to
take a picture of a user and configured to generate a user image
signal; a user analyzer configured to receive the user image signal
and configured to calculate a viewing direction and a viewing
distance of the user based on the user image signal; a gamma
corrector configured to generate a correction gamma value based on
the viewing direction and the viewing distance; a gamma voltage
generator configured to generate a gamma voltage based on the
correction gamma value; a display panel configured to display an
image corresponding to the gamma voltage; and a speaker module
configured to output a sound synchronized with the image.
2. The image display system of claim 1, wherein the user analyzer
comprises: a facial recognizer configured to receive the user image
signal and configured to recognize a face of the user; and a
viewing distance calculator configured to calculates the viewing
distance based on a size of the face; and a viewing direction
calculator configured to calculate the viewing direction of the
user based on the viewing distance and a position of the face.
3. The image display system of claim 1, wherein the speaker module
comprises: a sound corrector configured to receive sound data and
generate corrected sound data based on the viewing distance and the
viewing direction; and a speaker configured to receive the
corrected sound data and configured to output the sound.
4. The image display system of claim 3, wherein the sound corrector
is configured to correct an output level and an output timing of
the sound data and configured to generate the corrected sound
data.
5. An image display system comprising: a camera part configured to
take a picture of a user and configured to generate a user image
signal; a user analyzer configured to receive the user image signal
and configured to calculate a viewing direction of the user based
on the user image signal; a timing controller configured to receive
image data and correct the image data based on the viewing
direction; and a display panel configured to display an image
corresponding to the corrected image data.
6. The image display system of claim 5, further comprising a
look-up table configured to store a correction data value
corresponding to the viewing direction.
7. A method of driving an image display system, the method
comprising: taking a picture of a user and generating a user image
signal; calculating a viewing direction of the user based on the
user image signal; correcting image data based on the viewing
direction of the user; and displaying an image corresponding to the
corrected image data,
8. An image display system comprising: a camera configured to
generate an image signal of a user; a user analyzer configured to
generate positional information of the user from the image signal;
and a gamma corrector configured to correct a first gamma value
into a second gamma value corresponding to the positional
information.
9. The image display system of claim 8, further comprising a
speaker module configured to output a sound whose magnitude
corresponds to the positional information.
10. The image display system of claim 8, further comprising a light
source controller configured to adjust brightness of a light source
according to the positional information.
11. The image display system of claim 8, further comprising a data
corrector configured to change a data format of an image
corresponding to the image signal of the user into another data
format.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This U.S. non-provisional patent application is a divisional
of U.S. application Ser. No. 13/613,660, filed in the U.S. Patent
and Trademark Office on Sep. 13, 2012, which in turn claims
priority under 35 U.S.C. .sctn.119 of Korean Patent Application No.
10-2012-0040401 filed on Apr. 1.8, 2012, the contents of which are
herein incorporated by reference in their entirety.
TECHNICAL FIELD
[0002] Embodiments of the present disclosure relate to an image
display system and a method of driving the same. More particularly,
embodiments of the present disclosure relate to an image display
system that can increase display quality in consideration of a
user's viewing direction and a method of driving the same.
DISCUSSION OF THE RELATED ART
[0003] Various display devices for electronic devices, such as
computer monitors, mobile phones, or television sets have been
developed.
[0004] Gamma values of display devices are fixed when the display
devices are initially designed, so that the display quality of the
display devices depends on a distance from a user or the user's
position.
SUMMARY
[0005] Embodiments of the present disclosure provide an image
display system that can increase display quality and control image
brightness and sound in consideration of a user's position and a
method of driving the image display system.
[0006] An embodiment of the inventive concept provides an image
display system includes a camera part and an image display part.
The image display part includes a user analyzer, a gamma corrector,
a gamma voltage generator, and a display panel.
[0007] The camera part takes a picture of a user and generates a
user image signal. The user analyzer receives the user image signal
and calculates the user's viewing direction based on the user image
signal. The gamma corrector generates a correction gamma value
based on the viewing direction. The gamma voltage generator
generates a gamma voltage based on the correction gamma value. The
display panel displays an image corresponding to the gamma
voltage.
[0008] The user analyzer includes a facial recognizer and a viewing
direction calculator. The facial recognizer receives the user image
signal and recognizes the user's face, and the viewing direction
calculator calculates the user's viewing direction based on a
position of the face.
[0009] According to an embodiment, the image display system further
includes a light source and a light controller. The light source
provides light to the display panel. The light source controller
controls a brightness of the light source based on the viewing
direction.
[0010] According to an embodiment, the image display system further
includes a speaker module. The speaker module includes a sound
corrector and a speaker. The sound corrector receives a sound data
and generates a corrected sound data based on the viewing distance
and the viewing direction, The speaker receives the corrected sound
data and outputs the sound.
[0011] An embodiment of the inventive concepts provide an image
display system includes a camera part and an image display part.
The image display part includes a user analyzer, a timing
controller, and a display panel. The camera part takes a picture of
a user and generates a user image signal. The user analyzer
receives the user image signal and calculates the user's viewing
direction based on the user image signal. The timing controller
receives image data and corrects the image data based on the
viewing direction. The display panel displays an image
corresponding to the corrected image data.
[0012] An embodiment of the inventive concept provides a method of
driving an image display system includes taking a picture of a user
and generating a user image signal, calculating a viewing direction
of the user based on the user image signal, generating a correction
gamma value based on the viewing direction, generating a gamma
voltage based on the correction gamma value, and displaying an
image corresponding to the gamma voltage.
[0013] According to an embodiment, there is provided an image
display system including a camera configured to generate a user's
image signal, a user analyzer configured to generate the user's
positional information from the image signal, and a gamma corrector
configured to correct a first gamma value into a second gamma value
corresponding to the positional information.
[0014] The image display system may further include at least one of
a speaker module configured to output a sound whose magnitude
corresponds to the positional information, a light source
controller configured to adjust brightness of a light source
according to the positional information, or a data corrector
configured to change a data format of an image corresponding to the
user's image signal into another data format.
[0015] According to the embodiments, the gamma value or the image
data is corrected based on the user's viewing direction in real
time, and thus visibility of the image display system may be
increased regardless of the user's position.
[0016] The image display system may allow the brightness and the
sound of the image to be suited to the user in consideration of the
user's viewing direction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The embodiments of the present invention will become readily
apparent by reference to the following detailed description When
considered in conjunction with the accompanying drawings
wherein:
[0018] FIG. 1 is a perspective view showing an image display system
according to an exemplary embodiment of the present invention;
[0019] FIG. 2 is a block diagram showing the image display system
shown in FIG. 1;
[0020] FIG. 3 is a block diagram showing the user analyzer shown in
FIG. 2;
[0021] FIG. 4 is a view for describing a process of calculating a
user's viewing direction;
[0022] FIG. 5A is a graph showing gamma curves according to view
angles;
[0023] FIG. 5B is a graph showing gamma curves obtained by
compensating for the gamma curves shown in FIG. 5A;
[0024] FIG. 6 is a block diagram showing an image, display system
according to an exemplary embodiment of the present invention;
[0025] FIG. 7 is a block diagram showing an image display system
according to an exemplary embodiment of the present invention;
[0026] FIG. 8 is a block diagram showing the user analyzer shown in
FIG. 7;
[0027] FIG. 9 is a block diagram showing the speaker module shown
in FIG. 7;
[0028] FIG. 10 is a block diagram showing an image display system
according to an exemplary embodiment of the present invention;
[0029] FIG. 11 is a flowchart illustrating a method of driving an
image display system. according to an embodiment of the present
invention; and
[0030] FIG. 12 is a flowchart illustrating a method of driving an
image display system. according to an embodiment of the present
invention.
DETAILED DESCRIPTION
[0031] It will be understood that when an element or layer is
referred to as being "on", "connected to" or "coupled to" another
element or layer, it can be directly on, connected or coupled to
the other element or layer or intervening elements or layers may be
present. Like numbers may refer to like or similar elements
throughout the specification and the drawings. As used herein, the
term "and/or" includes any and ail combinations of one or more of
the associated listed items.
[0032] As used herein, the singular forms, "a", "an" and the are
intended to include the plural forms as well, unless the context
clearly indicates otherwise.
[0033] As will be appreciated by one skilled in the art,
embodiments of the present invention may be embodied as a system,
method, computer program product, or a computer program product
embodied in one or more computer readable medium(s) having computer
readable program code embodied thereon. The computer readable
program code may be provided to a processor of a general purpose
computer, special purpose computer, or other programmable data
processing apparatus. The computer readable medium may be a
computer readable signal medium or a computer readable storage
medium. The computer readable storage medium may be any tangible
medium that can contain, or store a program for use by or in
connection with an instruction execution system, apparatus, or
device.
[0034] Hereinafter, embodiments of the present invention will be
described in detail with reference to the accompanying drawings.
The present invention may be embodied in various different ways and
should not be construed as limited to the exemplary embodiments
described herein.
[0035] FIG. 1 is a perspective view showing an image display system
according to an exemplary embodiment of the present invention. FIG.
2 is a block diagram showing the image display system shown in FIG.
1.
[0036] Referring to FIGS. 1 and 2, the image display system
includes a camera part 100 and an image display part 1000.
[0037] The camera part 100 takes a picture of a user and generates
a user image signal m1. For example, the camera part 100 takes a
picture of a user positioned in front of the image display part
1000 at a predetermined distance and a predetermined angle,
generates a user image signal m1 including the user's position
information, and applies the user image signal m1 to the image
display part 1000. According to an embodiment, the camera part 100
includes a real time motion picture camera, and the user image
signal m1 includes a real time motion picture signal. The camera
part 100 has a preset upper and lower view angle and a preset left
and right view angle.
[0038] As shown in FIG. 1, the camera part 100 is embedded in the
image display part 1000. According to an embodiment, the camera
part 100 takes the picture of the user through an opening OP formed
on a front portion of the image display part 1000. However, the
camera part 100 is limited as being positioned in the image display
part 1000. Alternatively, the camera part 100 is separated from the
image display part 1000 and attached to an external side portion of
the image display part 1000.
[0039] The image display part 1000 includes a display area DA and a
non-display area NA disposed adjacent to at least a portion of the
display area DA. The opening OP is positioned at the non-display
area NA and exposes the camera part 100.
[0040] The image display part 1000 includes a display panel 200, a
timing controller 300, a gate driver 400, a data driver 500, a user
analyzer 600, a gamma corrector 700, and a gamma voltage generator
800.
[0041] The display panel 200 displays an image. The display panel
200 includes, but is not limited to, an organic light emitting
display panel, a liquid crystal display panel, a plasma display
panel, an electrophoretic display panel, or an electrowetting
display panel. Hereinafter, as an example, a liquid crystal display
panel is used as the display panel 200.
[0042] The display panel 200 includes a plurality of gate lines G1
to Gk applied with a gate signal and a plurality of data lines D1
to Dm applied with a data voltage. The gate lines G1 to Gk are
insulated from and cross the data lines D1 to Dm. The display panel
200 includes a plurality of pixel areas arranged in a matrix form,
and plural pixels are arranged in the pixel areas, respectively, As
shown in FIG. 2, an equivalent circuit of one pixel PXL of the
pixels is shown as an example. The pixel PXL includes a thin film
transistor 210, a liquid crystal capacitor 220, and a storage
capacitor 230.
[0043] According to an embodiment, the thin film transistor 210
includes a gate electrode, a source electrode, and a drain
electrode, The gate electrode is connected to a first gate line G1
of the gate lines G1 to Gk, the source electrode is connected to a
first data line DL1 of the data lines D1 to Dm, and the drain
electrode is connected to the liquid crystal capacitor 220 and the
storage capacitor 230.
[0044] The display panel 200 includes a first display substrate, a
second display substrate facing the first display substrate, and a
liquid crystal layer disposed between the first display substrate
and the second display substrate.
[0045] The first display substrate includes the gate lines G1 to
Gk, the data lines D1 to Dm, the thin film transistor 210, and a
pixel electrode (not shown) that functions as a first electrode of
the liquid crystal capacitor 220. The thin film transistor 210
applies the data voltage to the pixel electrode in response to the
gate signal.
[0046] The second display substrate includes a common electrode
(not shown) that functions as a second electrode of the liquid
crystal capacitor 220. The common electrode is applied with a
reference voltage. The liquid crystal layer is disposed between the
pixel electrode and the common electrode and functions as a
dielectric substance. The liquid crystal capacitor 220 is Charged
with a voltage corresponding to an electric potential between the
data voltage and the reference voltage.
[0047] The timing controller 300 receives image data Data and
control signals cont from an outside source of the image display
part 1000. The control signals include a horizontal synchronization
signal, a vertical synchronization signal, a main clock signal, and
a data enable signal.
[0048] The timing controller 300 converts a data format of the
image data Data to a data format suited for an interface between
the data driver 500 and the timing controller 300 and applies the
converted image data Data1 to the data driver 500. The timing
controller 300 applies a data control signal cont1, such as an
output start signal, a horizontal start signal, a horizontal dock
signal, or a polarity inversion signal, to the data driver 500 and
applies a gate control signal cont2, such as a vertical start
signal, a vertical dock signal, or a vertical clock bar signal, to
the gate driver 400.
[0049] The gate driver 400 is electrically connected to the gate
lines G1 to Gk disposed on the display panel 200 and applies the
gate signal to the gate lines G1 to Gk. For example, the gate
driver 400 generates the gate signal to drive the gate lines G1 to
Gk in response to the gate control signal cont2 from the timing
controller 300 and sequentially applies the gate signal to the gate
lines G1 to Gk.
[0050] The data driver 500 selects some of a plurality of gamma
voltages GMM1 to GMMi, which correspond to the converted image data
data1 in response to the data control signal cont1 provided from
the timing controller 300 and generates data voltages, and applies
the generated data voltages to the data lines D1 to DM.
[0051] The user analyzer 600 receives the user image signal m1 from
the camera 100 and calculates the user's viewing direction based on
the user image signal m1. The user analyzer 600 generates a user
position signal m2 including information about the user's viewing
direction and applies the user position signal m2 to the gamma
corrector 700.
[0052] The image display part 1000 further includes a first look-up
table LUT1 that stores a gamma value corresponding to the viewing
direction.
[0053] The gamma corrector 700 reads out the gamma value
corresponding to the viewing direction from the first look-up table
LUT1 and generates a correction gamma value gc. The gamma corrector
700 applies the correction gamma value gc to the gamma voltage
generator 800.
[0054] The gamma voltage generator 800 generates the gamma voltages
GMM1 to GMMi, which have been previously set for gray-scale levels,
respectively, in accordance with a gamma curve of the correction
gamma value gc and applies the gamma voltages GMM1 to GMMi to the
data driver 500.
[0055] FIG. 3 is a block diagram showing the user analyzer 600
shown in FIG. 2.
[0056] Referring to FIG. 3, the user analyzer 600 includes a facial
recognizer 610 and a viewing direction calculator 630.
[0057] The facial recognizer 610 extracts positions of a user's
eyes, nose, and mouth based on the user image signal m1 and
recognizes the user's facial features. According to an embodiment,
when the facial recognizer 610 does not recognize the user's facial
features, the image display part 1000 operates in a power saving
mode after a predetermined time.
[0058] The viewing direction calculator 630 calculates the user's
viewing direction based on the positions of the eyes, nose, and
mouth. For example, the viewing direction calculator 630 calculates
the viewing direction based on a center point of the user's two
eyes and the upper and lower view angle and the left and right view
angle of the camera part 100. According to an embodiment, the
viewing direction calculator 630 calculates the user's upper and
lower view angle and left and right view angle.
[0059] FIG. 4 is a view for describing a process of calculating a
user's viewing direction.
[0060] For convenience of description, FIG. 4 shows the user that
looks down the image display part 1000 from a front upper side of
the image display part 1000. However, according to an embodiment,
the process of calculating the viewing direction applies to an
example where the user views the image display part 1000 from
lower, left, and right sides of the image display part 1000. For
purposes of description, the user image signal m1 is represented as
a user image img.
[0061] Referring to FIGS. 3 and 4, the camera part 100 has a preset
upper and lower view angle .theta.1. The viewing direction
calculator 630 determines that the user looks down the image
display part 1000 when the user's face is positioned over a
reference position rr in the user image img. According to an
embodiment, the reference position rr is predetermined in the user
image img, and as an example, the reference position rr is
positioned at a center point of the user image img in FIG. 4. The
viewing direction calculator 630 calculates the center point cc
between the two eyes in the face fc and calculates a view angle
.theta.2 based on the center point cc and the upper and lower view
angle .theta.1. For instance, when the upper and lower view angle
.theta.1 is about 45 degrees and when the center point cc is
determined to be positioned at an upper central portion in the user
image img, the view angle .theta.2 is about +22.5 degrees.
Similarly, the view angle .theta.2 is about -22.5 degrees when it
is determined that the center point cc is positioned at a lower
central portion of the user image img. The viewing direction
calculator 630 stores a plurality of view angles corresponding to
positions of the center point cc.
[0062] FIG. 5A is a graph showing gamma curves according to view
angles, and FIG. 5B is a graph showing gamma curves obtained by
compensating for the gamma curves shown in FIG. 5A.
[0063] Referring to FIGS. 2 and 5A, there are differences between
the gamma curves obtained when the user views the image display
part 1000 from front, upper, and lower sides of the image display
part 1000. For example, the brightness perceived by the user is
relatively higher when the user looks down the image display part
1000 than when the user views the image display part 1000 from the
front side of the image display part 1000. The brightness perceived
by the user is relatively lower when the user looks up the image
display part 1000 than when the user views the image display part
1000 from the front side of the image display part 1000.
[0064] The correction gamma values that correct the gamma curves in
accordance with the user's view angles are shown in Table 1:
TABLE-US-00001 TABLE 1 View angle -20 deg. -10 deg. 0 deg. 10 deg.
20 deg. Correction 1.2 1.7 2.2 2.6 3 gamma value
[0065] Referring to Table 1, when the user looks up the image
display part 1000 and the view angle is about 20 degrees, the gamma
corrector 700 selects the correction gamma value of about 1.2.
Similarly, when the user looks down the image display part 1000 and
the view angle is about 20 degrees, the gamma corrector 700 selects
the correction gamma value of about 3.
[0066] When the correction gamma values are applied, the gamma
curves are substantially the same regardless of the view angles as
shown in FIG. 5B.
[0067] The image display system may provide the image having
optimized gamma curve to the user in real time even without a
separate input from the user.
[0068] FIG. 6 is a block diagram showing an image display system
according to an exemplary embodiment of the present invention.
[0069] The image display system has the same or substantially the
same in configuration and functions as the image display system
described in connection with FIG. 2 except that the image display
system illustrated in FIG. 6 further includes a light controller
900 and a light source 910.
[0070] Referring to FIG. 6, the light source 910 is disposed under
the display panel 200 and supplies light to the display panel 200.
According to an embodiment, a plurality of light sources 910 are
provided. According to an embodiment, the light source 910 includes
a point light source, such as a light emitting diode (LED), or a
line light source, such as a cold cathode fluorescent lamp
(CCFL).
[0071] The light source controller 900 controls the light source
910, The light source controller 900 receives the user position
signal m2 from the user analyzer 600 and controls the brightness of
the light source 910 based on the viewing direction. For instance,
the light source controller 900 controls the light source 910 so
that the brightness of the light source 910 decreases when the user
looks down the image display part 1000 since the brightness
perceived by the user is relatively higher when the user looks down
the image display part 1000 than when the user views the image
display part 1000 from the front of the image display part 1000.
The light source controller 900 controls the light source 910 so
that the brightness of the light source 910 increases when the user
looks up the image display part 1000 since the brightness perceived
by the user is relatively lower when the user looks up the image
display part 1000 than when the user views the image display part
1000 from the front of the image display part 1000. The image
display system may provide an image having an optimized gamma curve
to the user in real time even without a separate input from the
user.
[0072] FIG. 7 is a block diagram showing an image display system
according to an exemplary embodiment of the present invention,
[0073] The image display system has the same or substantially the
same in configuration and functions as the image display system
described in connection with FIG. 2 except that the image display
system illustrated in FIG. 7 further includes a speaker module 950
and includes a different configuration of the user analyzer.
[0074] Referring to FIG. 7, the user analyzer 601 generates a user
position signal m3 including information about a user's viewing
direction and viewing distance and applies the user position signal
m3 to the gamma corrector 700 and the speaker module 950.
[0075] The speaker module 950 outputs a sound in synchronization
with an image displayed on the display panel 200. The speaker
module 950 receives sound data s-data from an external source (not
shown), a sound synchronization signal cont3 from the timing
controller 300, and the user position signal m3 from the user
analyzer 600. The sound synchronization signal cont3 is used to
synchronize the image displayed on the display panel 200 with the
sound.
[0076] The speaker module 950 corrects an output level and timing
of the sound data s-data based on the user position signal m3 and
outputs the sound.
[0077] FIG. 8 is a block diagram showing the user analyzer shown in
FIG. 7.
[0078] Referring to FIG. 8, the user analyzer 601 includes as
facial recognizer 610, a viewing distance calculator 620, and a
viewing direction calculator 630. The facial recognizer 610 and the
viewing direction calculator 630, respectively, have the same or
substantially the same in structure and functions as the facial
recognizer and the viewing direction calculator described in
connection with FIG. 3.
[0079] The viewing distance calculator 620 calculates a distance,
e.g., a viewing distance, between the image display part 1000 and
the user. For example, the viewing distance calculator 620 stores a
plurality of viewing distance values in accordance with the size of
the user's face and calculates the viewing distance based on the
size of the user's face extracted from the user image signal
m1.
[0080] FIG. 9 is a block diagram showing the speaker module shown
in FIG. 7.
[0081] Referring to FIG. 9, the speaker module 950 includes a sound
corrector 960 and a speaker 970. The sound corrector 960 receives
the sound data s-data and the user position signal m3. The sound
corrector 960 corrects the output level and the output timing of
the sound data s-data based on the user's viewing distance and
viewing direction included in the user position signal m3 and
generates corrected sound data s-data1.
[0082] The speaker 970 receives the corrected sound data s-data1
and outputs the sound.
[0083] The image display system may provide an image having an
optimized gamma curve to the user in real time even without the
user's separate input.
[0084] FIG. 10 is a block diagram showing an image display system
according to an exemplary embodiment of the present invention.
[0085] The image display system have the same or substantially the
same in configuration and functions as the image display system
described in connection with FIG. 2 except that the timing
controller has a different configuration, a second look-up table
LUT2 is included, the gamma voltage generator 850 has different
functions, and the first look-up table LUT1 and the gamma corrector
700 are not provided. The image display system further includes a
second look-up table LUT2 that stores a plurality of data values
corresponding to the viewing direction.
[0086] The timing controller 350 receives image data Data and
control signals cont from an outside source of the image display
part 1000. The timing controller 350 receives a user position
signal m2 from the user analyzer 600. The control signals cont
include a horizontal synchronization signal, a vertical
synchronization signal, a main clock signal, and a data enable
signal.
[0087] The timing controller 350 corrects the image data Data based
on the viewing direction of the user and converts a data format of
the corrected image data Data to a data format suited for an
interface between the data driver 500 and the timing controller 300
and applies the converted image data data2 to the data driver 500.
The timing controller 350 applies a data control signal cont1, such
as an output start signal, a horizontal start signal, a horizontal
clock signal, or a polarity inversion signal, to the data driver
500 and applies a gate control signal cont2, such as a vertical
start signal, a vertical clock signal, or a vertical clock bar
signal, to the gate driver 400.
[0088] The timing controller 350 includes a data corrector 360. The
data corrector 360 receives the user position signal m2 and
corrects the image data Data based on the user's viewing direction.
According to an embodiment, the data corrector 360 reads out a data
value from the second look-up table LUT2, which corresponds to the
viewing direction of the user, and generates the corrected image
data. The data corrector 360 corrects gray scale information and
brightness information of the image data Data.
[0089] The gamma voltage generator 850 generates the gamma voltages
GMM1 to GMMi in accordance with a predetermined gamma curve and
applies the gamma voltage GMM1 to GMMi to the data driver 500.
Different from the image display system described in connection
with FIG. 2, the image display system illustrated in FIG. 10
corrects the image data Data without correcting the gamma value.
The image display system may provide an image having an optimized
gamma curve to the user in real time even without a separate input
from the user.
[0090] FIG. 11 is a flowchart illustrating a method of driving an
image display system according to an embodiment of the present
invention.
[0091] A user's picture is taken or the user's image is captured,
and a user image signal is generated (S10). The user's viewing
direction is calculated based on the user image signal (S30). A
correction gamma value is generated based on the user's viewing
direction (S50). A gamma voltage is generated based on the
correction gamma value (S70). An image corresponding to the gamma
voltage is displayed (S90).
[0092] FIG. 12 is a flowchart illustrating a method of driving an
image display system according to an embodiment of the present
invention.
[0093] A user's picture is taken or the user's image is captured,
and a user image signal is generated (S20). A viewing direction of
the user is calculated based on the user image signal (S40). Image
data is corrected based on the viewing direction of the user (S60).
An image corresponding to the corrected image data is displayed
(S80).
[0094] Although the exemplary embodiments of the present invention
have been described, it is understood that the present invention
should not be limited to these exemplary embodiments but various
changes and modifications can be made by one ordinary skilled in
the art within the spirit and scope of the present invention as
hereinafter claimed.
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