U.S. patent application number 15/915948 was filed with the patent office on 2018-07-19 for display device.
This patent application is currently assigned to JAPAN DISPLAY INC.. The applicant listed for this patent is JAPAN DISPLAY INC.. Invention is credited to Masaya ADACHI.
Application Number | 20180204888 15/915948 |
Document ID | / |
Family ID | 60911166 |
Filed Date | 2018-07-19 |
United States Patent
Application |
20180204888 |
Kind Code |
A1 |
ADACHI; Masaya |
July 19, 2018 |
DISPLAY DEVICE
Abstract
A plurality of pixels P and a plurality of light-transmitting
regions L are alternately disposed such that a light-transmitting
region M1 is disposed between two pixels closest to each other in a
X-direction and a light-transmitting region M2 is disposed between
two pixels closest to each other in a Y-direction. Each of the
light-transmitting regions is divided into a plurality of divided
regions by a plurality of wirings WX and a plurality of wirings WY.
The divided regions include first regions and second regions that
are different from each other in widths in at least one of the
X-direction and the Y-direction.
Inventors: |
ADACHI; Masaya; (Minato-ku,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
JAPAN DISPLAY INC. |
Minato-ku |
|
JP |
|
|
Assignee: |
JAPAN DISPLAY INC.
Minato-ku
JP
|
Family ID: |
60911166 |
Appl. No.: |
15/915948 |
Filed: |
March 8, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
15480799 |
Apr 6, 2017 |
9947725 |
|
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15915948 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01L 27/322 20130101;
H01L 51/5284 20130101; H01L 27/3213 20130101; H01L 27/326 20130101;
H01L 2251/5315 20130101; H01L 27/3218 20130101; H01L 27/3216
20130101; H01L 27/3276 20130101 |
International
Class: |
H01L 27/32 20060101
H01L027/32 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 7, 2016 |
JP |
2016-135144 |
Claims
1. A display device comprising: a pixel including sub pixels; a
first light-transmitting region adjacent to the pixel; wherein the
first light-transmitting region is divided into first divided
regions arranged in a first direction, the first divided regions
include a first region with a first width in the first direction
and a second region with a second width in the first direction, and
a value of the first width is different from a value of the second
width.
2. The display device according to claim 1, wherein wirings run in
a second direction intersecting the first direction, and the
wirings divide the first light-transmitting region into the first
divided regions.
3. The display device according to claim 2, wherein one of the
wirings runs between two of the sub pixels.
4. The display device according to claim 1, wherein a second
light-transmitting region is located at an opposite side of the
pixel from the first light-transmitting region, the second
light-transmitting region is divided into second divided regions
arranged in the first direction, the second divided regions include
a third region with a third width in the first direction and a
fourth region with a fourth width in the first direction, and a
value of the third width is different from a value of the fourth
width.
5. The display device according to claim 1, wherein a third
light-transmitting region is adjacent to the pixel in the first
direction, the third light-transmitting region is divided into
third divided regions arranged in the first direction, the third
divided regions include a fifth region with a fifth width in the
first direction and a sixth region with a sixth width in the first
direction, and a value of the fifth width is different from a value
of the sixth width.
6. The display device according to claim 1, further comprising
pixels including the pixel and light-transmitting regions including
the first light-transmitting region, wherein the pixels are
disposed in a staggered pattern, and the first light-transmitting
regions are disposed in a staggered pattern.
7. A display device comprising: a pixel including sub pixels; a
first light-transmitting region adjacent to the pixel in a first
direction; a second light-transmitting region and a third
light-transmitting region, the pixel being located between the
second light-transmitting region and the third light-transmitting
region in a second direction intersecting the first direction;
wherein the first light-transmitting region has a first width in
the first direction, the second light-transmitting region is
divided into first divided regions arranged in the first direction,
the first divided regions include a first region with a second
width in the first direction and a second region with a third width
in the first direction, the first width is larger than the second
width, and the third width is larger than the third width.
8. The display device according to claim 7, wherein a value of the
second width is different from a value of the third width.
9. The display device according to claim 7, wherein the third
light-transmitting regions is divided into second divided regions
arranged in the first direction, the second divided regions include
a third region with a fourth width in the first direction and a
fourth region with a fifth width in the first direction, the first
width is larger than the fourth width, and the third width is
larger than the fifth width.
10. The display device according to claim 7, wherein wirings run in
the second direction, and the wirings divide the second
light-transmitting region into the first divided regions.
11. The display device according to claim 10, wherein one of the
wirings runs between two of the sub pixels.
12. A display device comprising: a first pixel, a second pixel, and
a third pixel, each including sub-pixels; and a first
light-transmitting region, a second light-transmitting region, and
a third light-transmitting region through which light is
transmitted, wherein the first pixel, the first light-transmitting
region, and the second pixel are disposed in a first direction in
this order, the second light-transmitting region, the third pixel,
and the third light-transmitting region are disposed in the first
direction in this order, the first pixel and the second
light-transmitting region are disposed in a second direction that
intersects the first direction, each of the first to third
light-transmitting regions is divided into divided regions
including at least a first divided region and a second divided
region, the first divided region has a first width in the first
direction, the second divided region has a second width in the
first direction, and a value of the first width is different from a
value of the second width.
13. The display device according to claim 12, wherein the
sub-pixels include a first sub-pixel, a second sub-pixel, and a
third sub-pixel which are adjacent to one another in the first
direction, each of the first light-transmitting region, the second
light-transmitting region, and the third light-transmitting region
includes the first divided region and the second divided region,
and a third divided region, the first sub-pixel is adjacent to the
first divided region in the second direction, the second sub-pixel
is adjacent to the second divided region in the second direction,
and the third sub-pixel is adjacent to the third divided region in
the second direction.
14. The display device according to claim 12, wherein wirings run
in the second direction, and the wirings divide each of the first
to third light-transmitting regions into the divided regions.
15. The display device according to claim 14, wherein one of the
wirings runs between two of the sub pixels.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application is a continuation of U.S.
application Ser. No. 15/480,799, filed Apr. 6, 2017, which claims
priority from Japanese application JP2016-135144 filed on Jul. 7,
2016, the contents of each of which are hereby incorporated by
reference into this application.
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0002] The present invention relates to a display device.
2. Description of the Related Art
[0003] There has been known a so-called transparent display device
that displays an image on a display area and has a structure
allowing the object beyond the display area to be seen through.
JP2012-238544A discloses a transparent display device in which
adjacent three sub-pixels, including a red sub-pixel, a green
sub-pixel, and a blue sub-pixel constitute one pixel, and the
transparent display device has a transparent region
(light-transmitting region) adjacent to the pixel (refer to FIG. 14
(b) of JP2012-238544A).
[0004] In recent years, transparency of transparent display devices
is expected to be enhanced.
SUMMARY OF THE INVENTION
[0005] One or more embodiments of the present invention have been
conceived in view of the above, and an object thereof is to enhance
transparency of a display device having a light-transmitting
region.
[0006] A display device according to one aspect of the present
invention includes a plurality of pixels each including
light-emitting regions, colors of the light-emitting regions being
different from each other, a plurality of light-transmitting
regions; a plurality of first wirings extending in a first
direction; and a plurality of second wirings extending in a second
direction that intersects the first direction, wherein the pixels
and the light-transmitting regions are alternately disposed such
that at least one of the light-transmitting regions is disposed
between two of the pixels which are adjacent to each other in the
first direction and at least one of the light-transmitting regions
is disposed between two of the pixels which are adjacent to each
other in the second direction, each of the light-transmitting
regions is divided into a plurality of divided regions by at least
one of the first wirings and the second wirings, the divided
regions include a first region with a first width and a second
region with a second width which is a same direction of the first
width, the same direction is one of the first and second direction,
a value of the first width is different from a value of the second
width.
[0007] The display device according to another aspect of the
present invention includes a first pixel, a second pixel, and a
third pixel, each including a plurality of sub-pixels, and a first
light- transmitting region, a second light-transmitting region, and
a third light-transmitting region through which light is
transmitted, wherein the first pixel, the first light-transmitting
region, and the second pixel are disposed in a first direction in
this order, the second light-transmitting region, the third pixel,
and the third light-transmitting region are disposed in the first
direction in this order, the first pixel and the second
light-transmitting region are disposed in a second direction that
intersects a first direction, a plurality of wirings extending in
the second direction, each of the first to third light-transmitting
regions is divided into a plurality of divided regions including at
least a first divided region and a second divided region by the
wirings, the first divided region has a first width in the first
direction, the second divided region has a second width in the
first direction, and a value of the first width is different from a
value of the second width.
[0008] The display device according to another aspect of the
present invention includes a first pixel, a second pixel, and a
third pixel, each including a plurality of sub-pixels, a first
light-transmitting region, a second light-transmitting region, a
third light-transmitting region, a fourth light-transmitting
region, and a fifth light-transmitting region through which light
is transmitted, a plurality of first wirings extending in a second
direction t; and a plurality of second wirings extending in a first
direction that intersects the second direction, wherein the first
pixel, the first light-transmitting region, and the second pixel
are disposed in the first direction in this order, the second
light-transmitting region, the third pixel, and the third
light-transmitting region are disposed in the first direction in
this order, the first pixel and the second light-transmitting
region are disposed in the second direction, the first
light-transmitting region and the third pixel are disposed in the
second direction, the second pixel and the third light-transmitting
region are disposed in the second direction, the fourth
light-transmitting region includes an area between the first pixel
and the first light-transmitting region and an area between the
second light-transmitting region and the third pixel and extends in
the second direction, the fifth light-transmitting region includes
an area between the second pixel and the first light-transmitting
region and an area between the third light-transmitting region and
the third pixel and extends in the second direction, each of the
first to third light-transmitting regions is divided into a
plurality of fourth divided regions by the first wirings, both the
fourth light-transmitting region and the fifth light-transmitting
region is divided into a plurality of fifth divided regions by the
second wirings, one of the fourth divided region has a fourth width
in the first direction, one of the fifth divided region has a fifth
width in the first direction, and a value of the fourth width is
different from a value of the fifth width.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is a schematic sectional view schematically
illustrating a cross-sectional view of the display device around a
pixel switch transistor according to the first embodiment;
[0010] FIG. 2 is a schematic view illustrating a wiring structure
of the display device according to the first embodiment;
[0011] FIG. 3 is a diagram of an equivalent circuit per sub-pixel
of an active matrix constituting the display device according to
the first embodiment;
[0012] FIG. 4 is a schematic view of a light-emitting region and a
light-transmitting region in the display device according to the
first embodiment;
[0013] FIG. 5 is a schematic view illustrating a wiring structure
of the display device according to the second embodiment; and
[0014] FIG. 6 is a schematic view of light-emitting regions and
light-transmitting regions of the display device according to the
second embodiment.
DETAILED DESCRIPTION OF THE INVENTION
[0015] Embodiments of the present invention are described below
with reference to the accompanying drawings. The disclosure herein
is merely an example, and appropriate modifications coming within
the spirit of the present invention, which are easily conceived by
those skilled in the art, are intended to be included within the
scope of the invention as a matter of course . In the accompanying
drawings, widths, thicknesses, shapes, or other characteristics of
each part are schematically illustrated compared to actual
configurations for clarity of illustration. However, such a
schematic illustration is merely an example and not intended to
limit the present invention. In the present specification and
drawings, some elements identical or similar to those shown
previously are denoted by the same reference signs as the
previously shown elements, and thus repetitive detailed
descriptions of them may be omitted as appropriate.
[0016] Further, in the embodiments, when a positional relationship
between a component and another component is defined, the words
"on" and "below" suggest not only a case where the another
component is disposed immediately on or below the component, but
also a case where the component is disposed on or below the another
component with a third component interposed therebetween.
[0017] FIG. 1 is a schematic sectional view schematically
illustrating a cross-sectional view of the display device around a
pixel switch transistor according to the first embodiment. A
display device 100 is a so-called transparent display device that
displays an image on a display area A (see FIG. 2), while allowing
an object beyond the display device A to be seen through. The
display device 100 is a so-called top-emitting display device that
takes out light from an organic light-emitting diode 30 from a
direction opposite to a substrate 10 (R-arrow direction in FIG. 1),
and an active-driving type OLED (Organic Light Emitting Diode)
display device.
[0018] As shown in FIG. 1, the display device 100 includes the
substrate 10, a pixel switch transistor SST, the organic
light-emitting diode 30, a seal 40, a filler 50, and a counter
substrate 60, and has a structure in which these elements are
laminated. In the first embodiment, the organic light-emitting
diode 30 is used as a light emitting element, although a quantum
dot light-emitting element may also be used as a light emitting
element.
[0019] The pixel switch transistor SST includes a polysilicon
layer, which includes source/drain regions 21, 22, and a channel
region 23, a gate line layer 25, and source/drain electrodes 27.
Further, a first insulating interlayer 24 is provided on the
channel region 23, and a second insulating interlayer 28 is
provided on the source/drain electrodes 27. A first base film 70
made of a material such as silicon nitride (SiNx) is disposed
between the substrate 10 and the pixel switch transistor SST so
that an ion, such as natrium and kalium, is not mixed into the
channel region 23 and the gate line layer 25 from the substrate 10.
A second base film 71 made of silicon oxide (SiOx) is disposed
between the first base film 70 and the channel region 23. An
insulating film 80 is provided on the second base film 71.
[0020] The organic light-emitting diode 30 includes an organic EL
(Electro Luminescence) layer 31, a lower electrode 32 provided
below the organic EL layer 31, and an upper electrode 33 provided
on the organic EL layer 31. One of the lower electrode 32 and the
upper electrode 33 functions as an anode, and the other functions
as a cathode.
[0021] The organic EL layer 31 covers a light-emitting region of
the lower electrode 32, and is connected to one of the source/drain
electrodes 27 through a hole penetrating the second insulating
interlayer 28. A third insulating interlayer (bank) 90 is formed in
a non-light emitting region so as to separate the organic EL layer
31 from the lower electrode 32. The upper electrode 33 is provided
so as to cover the entire organic EL layer 31.
[0022] Here, the configuration of the organic EL layer 31 will be
discussed. The configuration of the organic EL layer 31 is well
known technology, and thus, is simplified in FIG. 1. The organic EL
layer 31 is configured by stacking an electron transport layer, a
light emitting layer, and a hole transport layer, from the cathode
side to the anode side in this order. A hole injection layer and a
hole blocking layer may be disposed between the anode and the light
emitting layer in addition to the hole transport layer. Further, an
electron injection layer or an electron blocking layer may be
disposed between the cathode and the light emitting layer in
addition to the electron transport layer. The light emitting layer
and the electron transport layer may be one layer made of materials
capable of serving their functions.
[0023] When a DC voltage is applied between the lower electrode 32
and the upper electrode 33, holes injected from the anode side
reach the light emitting layer through the hole transport layer,
while electrons injected from the cathode side reach the light
emitting layer through the electron transport layer, and thus the
electrons and the holes are recombined. With the recombination of
the electrons and the holes, the organic light-emitting diode 30
emits light having a predetermined wavelength. In order to
efficiently utilize light emitted from the light emitting layer,
the lower electrode 32 is preferably made of a material having a
high light reflectance. The lower electrode 32 maybe configured by
laminating a transparent conductive film made of a material such as
indium tin oxide (ITO) and a reflective film made of a material
such as silver.
[0024] The seal 40 is formed so as to cover the upper electrode 33.
The seal 40 preferably has high gas barrier property so as to
protect the organic light-emitting diode 30 from water, for
example, and is transparent to visible light. For example, a dense
inorganic layer, such as silicon oxide, or a laminated film of an
inorganic layer and an organic layer may be used as the seal 40.
The counter substrate 60 is formed on the seal 40 through the
transparent filler 50 made of a polymeric material.
[0025] The counter substrate 60 includes a color filter 61, a black
matrix BM disposed around the color filter 61, and a transparent
substrate 62 disposed on the color filter 61. Although a glass
substrate is used as the substrate 10, it is not limited thereto
and any substrate having insulation properties, such as a resin
substrate, may be used.
[0026] Next, referring to FIGS. 2 and 3, an outline of a circuit
configuration of the display device according to the first
embodiment will be discussed. FIG. 2 is a schematic view
illustrating a wiring structure of the display device according to
the first embodiment. FIG. 3 is a diagram illustrating an
equivalent circuit per sub-pixel of an active matrix constituting
sub-pixels of the display device according to the first
embodiment.
[0027] In FIG. 2, a region surrounded by dashed lines on the
substrate 10 indicates a display area A, which displays an image.
On the display area A, a plurality of sub-pixels SP are disposed in
a matrix. As shown in FIG. 2, a data driving circuit 110 that
outputs an image signal to a data line D, a scan driving circuit
120 that outputs a scanning signal to a gate line G, and an output
driving circuit 130 that drives an output switch transistor BCT are
disposed around the display area A. The output driving circuit 130
includes a reset switch transistor RST (see FIG. 3) that is used
common to the sub-pixels SP arranged in X-direction in FIG. 2. As
described in details later, as shown in FIG. 2, the output switch
transistor BCT is provided so as to be used common to three
sub-pixels SP adjacent to each other in the X-direction.
[0028] As shown in FIG. 3, each sub-pixel SP includes a pixel
switch transistor SST, an organic light-emitting diode 30, a
storage capacitor Cs, a pixel capacitor Cad, and a driver
transistor DRT. The storage capacitor Cs and the pixel capacitor
Cad are condensers. The pixel capacitor Cad is an element for
controlling a light emission current amount, and is not needed in
some cases. In the pixel switch transistor SST, the gate electrode
is connected to the gate line G, one of the source/drain electrodes
is connected to the data line D, and the other one of the
source/drain electrodes is connected to the storage capacitor Cs.
In the driver transistor DRT, the gate electrode is connected to
the storage capacitor Cs, the source electrode is connected to a
potential wiring E (see FIG. 2) through the output switch
transistor BCT, and the drain electrode is connected to one of
electrodes of the organic light-emitting diode 30. Further, the
other one of the electrodes of the organic light-emitting diode 30
is connected to current supply lines S1 and S2 (see FIG. 2), which
are used common to all sub-pixels SP, and is held at a
predetermined potential. The pixel switch transistor SST, the
driver transistor DRT, the output switch transistor BCT, and the
reset switch transistor RST are formed by the same conductivity
type thin-film transistors, such as n-channel type thin-film
transistors.
[0029] In the pixel circuit of the sub-pixel SP shown in FIG. 3,
the driver transistor DRT and the output switch transistor BCT are
connected to the organic light-emitting diode 30 in series between
a high-potential power supply line SLa (also simply referred to as
power supply line) and a low-potential power supply line SLb (also
simply referred to as power supply line), and the gate electrode is
connected to a scanning line Sga. The driver transistor DRT
includes a source electrode connected to the organic light-emitting
diode 30, a drain electrode connected to a reset wiring Sgr, and a
gate electrode. The output switch transistor BCT switches drain
electrodes of the high-potential power supply line SLa and the
driver transistor DRT to a conducting state or a non-conducting
state.
[0030] The pixel switch transistor SST is connected the data line D
and the gate electrodes of the driver transistor DRT, and switches
whether to capture a video signal Vsig, which is transmitted
through the data line D, into the gate electrode of the driver
transistor DRT. The captured signal is stored in the storage
capacitor Cs.
[0031] The three adjacent sub-pixels SP in the X-direction share
the output switch transistor BCT (see FIG. 2). This enables to
reduce to one third of the number of the output switch transistor
BCT and reduce light-shielded area, compared to a case where each
sub-pixel SP is provided with an output switch transistor BCT, and
thus it is possible to provide a display device having higher
transparency.
[0032] When a display is performed with a known driving method in
the sub-pixel circuit configuration described above, an output
current given to the organic light-emitting diode has a value that
does not depend on a threshold voltage of the driver transistor
DRT. Further, the effect of the mobility of the driver transistor
DRT can be compensated. As such, display defect caused by
characteristic variance in the driver transistor DRT, streak-like
irregularities, and roughness are prevented, and high-quality image
display is enabled with three or less number of transistors per
sub-pixel. In this case, the smaller number of transistors can
reduce an area shielded from light by the transistors and the
surrounding wiring, and thus it is possible to provide a display
device having higher transparency.
[0033] FIG. 4 is a schematic view of the light-emitting region and
the light-transmitting region in the display device according to
the first embodiment. The display device 100 includes a
light-emitting region L and a light-transmitting region M on the
display area A. In a case where light-emitting regions need to be
distinguished, a light-emitting region is described with, for
example, an alphabet letter (G, R, B) indicating a color in
addition to "L" indicating a light-emitting region. In a case where
light-emitting regions do not need to be distinguished, a
light-emitting region is simply described as a light-emitting
region L. Similarly, pixels P, light-transmitting regions M,
wirings W, and divided regions D are described with numbers as
appropriate only when these elements need to be distinguished.
[0034] A pixel P is formed of a plurality of light-emitting regions
L having at least three luminescent colors. In the first
embodiment, as shown in FIG. 4, a pixel P is formed of three-color
light-emitting regions divided into a light-emitting region LG
having green luminescent color, a light-emitting region LR having
red luminescent color, and a light-emitting region LB having blue
luminescent color. The light-emitting regions LG, LR, and LB are
regions in which sub-pixels SP (see FIG. 2) respectively disposed
in corresponding light-emitting regions are controlled in
brightness and emit light. In FIG. 4, a reference sign SP
indicating a sub-pixel is omitted. Similarly, the reference sign SP
is omitted in FIG. 6 illustrating the second embodiment.
[0035] The first embodiment employs a color filter method in which
all light-emitting regions L emit the same color (e.g., white), and
only light having a predetermined wavelength transmits each
light-emitting region L through a color filter 61 provided in a
counter substrate 60, but not limited to this. The present
embodiments may employ a color-separation method for splitting the
organic EL layer 31 to emit light of colors according to
luminescent colors of the respective light-emitting regions L.
[0036] The light-emitting region L is a region divided by wirings
W, and has sub-pixels SP arranged therein. The light-transmitting
region M is an opening region divided by wirings W, and allows an
object beyond the display area A to be seen through. The wirings W
shown in FIG. 4 are, for example, the gate line G and the data line
D described by referring to FIGS. 2 and 3, although any type of
wiring may be used. As such, a wiring extending in the X-direction
(first direction) is described as a wiring WX (first wiring), and a
wiring extending in the Y-direction (second direction) intersecting
the X-direction is described as a wiring WY (second wiring). As
shown in FIG. 4, n wirings WX (n is an integer) are arranged in the
Y-direction, and m wirings WY (m is an integer) are arranged in the
X-direction.
[0037] In the first embodiment, a pixel P is formed of a
light-emitting region LG having green luminescent color, a
light-emitting region LR having red luminescent color, and a
light-emitting region LB having blue luminescent color. The
light-emitting regions LG, LR, and LB are disposed adjacent to one
another in the X-direction. Specifically, the light-emitting region
LR is disposed adjacent to the light-emitting region LG in the
X-direction, and the light-emitting region LB is disposed adjacent
to the light-emitting region LR in the X-direction.
[0038] The pixels P and the light-transmitting regions M are
alternately arranged such that one light-transmitting region M is
disposed between two pixels P closest to each other in the
X-direction, one pixel P is disposed between two light-transmitting
regions M closest to each other in the X-direction, one
light-transmitting region M is disposed between two pixels P
closest to each other in the Y-direction, and one pixel P is
disposed between two light-transmitting region M closest to each
other in the Y-direction. For example, as shown in FIG. 4, a
light-transmitting region M1 is disposed between a pixel P1 and a
pixel P3, which are two pixels closest to each other in the
X-direction, and a pixel P4 is disposed between a
light-transmitting region M2 and a light-transmitting region M3,
which are two light-transmitting regions M closest to each other in
the X-direction. Further, the light-transmitting region M2 is
disposed between the pixel P1 and the pixel P2, which are two
pixels closest to each other in the Y-direction, and the pixel P4
is disposed between the light-transmitting region M1 and the
light-transmitting region M4, which are two light-transmitting
regions closest to each other in the Y-direction. With this
arrangement, the pixels P are arranged in a staggered pattern
respectively in the X-direction and the Y-direction, and the
light-transmitting regions M are arranged in a staggered pattern
respectively in the X-direction and the Y-direction.
[0039] The light-transmitting regions M are divided into divided
regions D with at least one of the wirings WX and the wirings WY.
The light-transmitting regions M can also be divided into divided
regions D with at least one of the wirings WX or at least one of
the wirings WY. Specifically, for example, the light-transmitting
region M1 is divided into three divided regions D1 to D3, which are
adjacent to one another in the X-direction, by the wiring WY9 and
the wiring WY10. Similarly, each of other light-transmitting
regions M is divided into three divided regions D1 to D3 adjacent
to one another in the X-direction by two wirings WY.
[0040] Here, in the light-transmitting regions M, there is a case
where diffraction of light is caused by influence of edges of the
wirings WX and WY. In particular, when regions are divided by the
wirings WX and WY at regular intervals, that is, when the wirings
WX and WY are arranged with a constant period (integral multiple),
strong diffraction of light occurs. When the strong diffraction of
light occurs, the light is scattered and the transparency is
reduced, and thus an object that is seen through the display device
appears blurred to the human eye. In the first embodiment, the
light-transmitting regions M are divided into divided regions D of
different widths so that different periods are mixedly used.
[0041] Specifically, when the width of the divided region D1 (first
region) in the X-direction is l1, the width of the divided region
D2 (first region) in the X-direction is l2, and the width of the
divided region D3 (second region) in the X-direction is l3,
l1=l2<l3. The divided regions D in other light-transmitting
regions M, such as the light-transmitting regions M2 and M3, are
constructed in a similar way. In this way, it is possible to
prevent the diffraction of light from being strong by
differentiating the width of l3 from the width of l1 and the width
of l2. This is not limited thereto. For example, it is possible to
further prevent the diffraction of light from being strong by
differentiating the width of l1 from the width of l2. In the
present embodiment, l3 is greater than 1 times l1 and l2, and less
than two times l1 and l2 so that l3 is not an integral multiple of
l1 and l2.
[0042] As shown in FIG. 4, in the first embodiment, divided regions
D have the same width h1 in the Y-direction. However, this is not
limited thereto. For example, it is possible to further prevent the
diffraction of light from being strong by differentiating the width
of the divided region D in the light-transmitting region M1 in the
Y-direction from the width of the divided region D in the
light-transmitting region M2 in the Y-direction.
[0043] The light-transmitting region M needs to allow an object
beyond the display area A to be seen through. As such, some
consideration is preferably needed regarding the arrangement of the
transistors so that a transistor provided on each sub-pixel SP
avoids projecting from the light-emitting region L and being
provided on the light-transmitting region M.
[0044] In the first embodiment, as shown in FIG. 2, an output
switch transistor BCT is used common to three sub-pixels SP.
Specifically, the output switch transistor BCT is configured to be
used common to sub-pixels SP that respectively correspond to the
light-emitting region LG, the light-emitting region LR, and the
light-emitting region LB. In other words, in the first embodiment,
the output switch transistor BCT is used common to light-emitting
regions L corresponding to all sub-pixels SP forming one pixel P.
This configuration enables to reduce the number of transistors
provided in one pixel P, thereby placing the transistors within the
light-emitting region L and ensuring the transparency of the
light-transmitting region M. The transistor is not limited to be
used common to three sub-pixels, but maybe used common to two
sub-pixels.
[0045] As described above, in the first embodiment, the divided
regions D having the widths different from one another in the
X-direction are provided. This configuration prevents the
diffraction of light from being strong, and enhances transparency
of the light-transmitting region M. Further, the output switch
transistor BCT is used common to three sub-pixels SP, and thus the
transistors are placed within the light-emitting region L and the
transparency of the light-transmitting region M is ensured.
[0046] Next, referring to FIGS. 5 and 6, the display device 100
according to second embodiment will be described. FIG. 5 is a
schematic view illustrating a wiring structure of the display
device according to the second embodiment. FIG. 6 is a schematic
view of light-emitting regions and light-transmitting regions of
the display device according to the second embodiment. As for the
same components as those of the first embodiment, description will
be omitted.
[0047] As shown in FIG. 6, in the second embodiment, one pixel P is
formed of three light-emitting regions LG, LR, and LB divided in
three colors. Specifically, one pixel P is formed of a
light-emitting region LG having green luminescent color and a
light-emitting region LR having red luminescent color, which are a
pair of light-emitting regions adjacent to each other in the
X-direction, and a light-emitting region LB having blue luminescent
color, which is adjacent to both of the light-emitting regions LG
and LR in the Y-direction.
[0048] In the second embodiment, similarly to the first embodiment,
the pixels P are arranged in a staggered pattern respectively in
the X-direction and the Y-direction in the display area A. Further,
light-transmitting regions M are disposed in respective sides of a
pixel P so as to be adjacent to the pixel P in the X-direction and
in the Y-direction.
[0049] For example, as shown in FIG. 6, the light-transmitting
region M11 and the light-transmitting region M12 are disposed in
respective sides of the pixel P1 in the X-direction so as to be
adjacent to the pixel P1, and the light-transmitting region M13 and
the light-transmitting region M14 are disposed in respective sides
of the pixel P1 in the Y-direction so as to be adjacent to the
pixel P2.
[0050] For example, the light-transmitting region M11 is divided
into two divided regions D11 and D12, which are adjacent to each
other in the Y-direction, by the wiring WX5. Other
light-transmitting regions M adjacent to one another in the
X-direction of pixels P, such as the light-transmitting region M12,
are configured in the same way as the light-transmitting region
M11.
[0051] For example, the light-transmitting region M13 is divided by
a wiring WX3 and a wiring WY6 into four divided regions, which are
a divided region D13 and a divided region D14 adjacent to each
other in the X-direction and a divided region D15 and a divided
region D16 adjacent to each other in the X-direction so as to be
adjacent to the divided regions D13 and D14 in the Y-direction.
Other light-transmitting regions M adjacent to one another in the
Y-direction of pixels P, such as the light-transmitting region M14,
are configured in the same way as the light-transmitting region
M13.
[0052] When the width of the divided region D11 in the X-direction
is 14, the width of the divided region D15 in the X-direction is
15, and the width of the divided region D16 in the X-direction is
l6, l4>l5=l6. In this way, it is possible to prevent the
diffraction of light from being strong by differentiating l5 and l6
from l4. This is not limited thereto. For example, it is possible
to further prevent the diffraction of light from being strong by
differentiating l5 from l6. In the second embodiment, l4 is greater
than twice l5 and l6, and less than three times l5 and l6 so that
l4 is not an integral multiple of l5 and l6.
[0053] In the second embodiment, similarly to the first embodiment,
the output switch transistor BCT is used common to a plurality of
sub-pixels SP. Specifically, the output switch transistor BCT is
used common to three sub-pixels SP that respectively correspond to
the light-emitting region LG, the light-emitting region LR, and the
light-emitting region LB. In other words, in the second embodiment,
the output switch transistor BCT is used common to light-emitting
regions L that correspond to all sub-pixels SP forming one pixel P.
This configuration reduces the number of transistors provided in
one pixel P, thereby placing the transistors within the
light-emitting regions L and ensuring transparency of the
light-transmitting regions M.
[0054] As described above, in the second embodiment, the
light-transmitting regions M are disposed adjacent to one another
in respective sides of the pixels P in the X-direction and the
Y-direction. This configuration increases a ratio of the
light-transmitting regions M in the display area A, and thus
enhances transparency. Further, the divided regions D, which are
different from one another in widths in the X-direction, are
provided, and thus it is possible to further prevent the
diffraction of light from being strong and enhance the transparency
of the light-transmitting regions M. Further, the output switch
transistor BCT is used common to three sub-pixels SP. This
configuration enables to place the transistors within the
light-emitting region L and widen the light-transmitting regions M,
thereby ensuring the higher transparency of the light-transmitting
regions M.
[0055] In one pixel P, combinations and arrangements of colors of
light-emitting regions L are not limited to examples shown in FIGS.
4 and 6, and may include at least a light-emitting region L in a
color having high visibility. The color having the highest
visibility among green, red, and blue is green, and each pixel P
described in the first embodiment includes a light-emitting region
L having green luminescent color. In this regard, the visibility
indicates a degree to which a person feels brightness, and light
having about 550 nm wavelength is known to have high visibility. As
shown in FIGS. 4 and 6, a ratio of a blue light-emitting region LB
in one pixel P is preferably greater than ratios of green
light-emitting region LG and red light-emitting region LR in the
pixel P. This approach is effective for reducing power consumption,
because typically, luminous efficacy of blue is significantly lower
than that of green and red in the current organic
electroluminescence.
[0056] While there have been described what are at present
considered to be certain embodiments of the invention, it will be
understood that various modifications may be made thereto, and it
is intended that the appended claims coverall such modifications as
fall within the true spirit and scope of the invention.
* * * * *