JP2016090595A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that can simplify formation of a pixel control circuit while suppressing a deterioration in image quality.SOLUTION: Pixels are each formed of a plurality of sub pixels. The sub pixels are each provided with a light emitting element including an electrode pixel and a pixel control circuit controlling power supply to the light emitting element. A display device is provided, as the plurality of sub pixels, blue sub pixels emitting in blue and sub pixels in three colors other than blue. The pixels each have sub pixels S in three colors. The number of blue sub pixels S(B) provided in the adjacent n pixels P is smaller than n.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device.

  Some display devices have four sub-pixels of red, green, blue, and white in one pixel. Each subpixel is provided with a pixel electrode and a pixel control circuit for controlling current or voltage supply to the pixel electrode. The pixel control circuit is composed of TFTs and capacitors.

  Patent Documents 1 and 2 below disclose a liquid crystal display device in which one pixel has sub-pixels of four colors of red, green, blue, and white. The liquid crystal display device of Document 1 has two red subpixels, two green subpixels, one blue subpixel, and one white subpixel in one pixel. In Patent Document 3, one pixel is configured by three sub-pixels of red, green, and blue, and the green sub-pixel is formed larger than the other sub-pixels.

JP-A-2005-99797 Japanese Patent No. 4679242 Japanese Patent No. 5141418

  In recent years, display devices have been improved in definition. Along with this, the size of each pixel is reduced. For this reason, the area of the region where the pixel control circuit can be formed is reduced, and the formation of the pixel control circuit has become more difficult than in the past. In particular, a self-luminous display device such as an organic EL display device has a larger number of elements (TFTs and capacitors) constituting one pixel control circuit than a liquid crystal display device. For this reason, it is more difficult to form a pixel control circuit.

  An object of the present invention is to provide a display device that can facilitate the formation of a pixel control circuit while suppressing deterioration in image quality.

  A display device according to the present invention includes a plurality of pixels each having a plurality of sub-pixels, a light-emitting element including a pixel electrode provided in each of the plurality of sub-pixels, and the plurality of the plurality of sub-pixels. A pixel control circuit that is provided in each of the sub-pixels and controls current supply to the light-emitting elements. In the display device, as the plurality of sub-pixels, a blue sub-pixel emitting blue light and a sub-pixel of three colors other than blue are provided. Each of the plurality of pixels has subpixels of three colors other than blue, and the number of blue subpixels provided in adjacent n pixels is smaller than n. According to this, it is possible to facilitate the formation of the pixel control circuit while suppressing the deterioration of the image quality.

  A display device according to the present invention includes a first pixel having a plurality of sub-pixels, a second pixel having a plurality of sub-pixels, adjacent to the first pixel, and each of the plurality of sub-pixels. And a pixel control circuit provided. The plurality of sub-pixels include a first-color sub-pixel, and the first-color sub-pixel is disposed across the first pixel and the second pixel, and The pixel control circuit provided in the sub-pixel of the color is formed across the first pixel and the second pixel. According to this, formation of the pixel control circuit can be facilitated.

It is a perspective view of a display device concerning one embodiment of the present invention. It is a top view which shows the example of the layout of the pixel in a TFT substrate. It is a figure which shows the cross section in the III-III line of FIG. It is a circuit diagram which shows the example of the pixel control circuit formed in each pixel. It is a figure which shows the area | region in which the pixel control circuit is formed. It is a figure which shows the area | region in which the pixel control circuit is formed. In this figure, elements and wirings constituting the pixel control circuit are shown. It is a top view which shows the modification of the layout of the pixel in a TFT substrate. It is a figure which shows the area | region in which the pixel control circuit which concerns on the example of FIG. 7 is formed.

  Hereinafter, an embodiment of the present invention will be described. The disclosure of the present specification is merely an example of the present invention, and appropriate modifications that maintain the gist of the present invention and that can be easily conceived by those skilled in the art are included in the scope of the present invention. Moreover, the width | variety of each part shown in a figure, thickness, a shape, etc. are represented typically and do not limit the interpretation of this invention. In this specification, an organic EL display device will be described as an example of a display device, but the present invention may be applied to a display device other than the organic EL display device.

  FIG. 1 is a perspective view of an organic EL display device 1 according to an embodiment of the present invention. The organic EL display device 1 has a TFT (Thin Film Transistor) substrate 2. The organic EL display device 1 has a counter substrate 21 that faces the TFT substrate 2.

  FIG. 2 is a plan view showing an example of the layout of the pixels P on the TFT substrate 2. In this figure, the hatched portion is a bank layer 8 to be described later. Light is emitted from an opening A1 (hereinafter referred to as a bank opening) formed in the bank layer.

  A plurality of pixels P are formed on the TFT substrate 2. The plurality of pixels P are arranged in the horizontal direction (X direction in FIG. 2) and the vertical direction (Y direction in FIG. 2). Each pixel P is composed of a plurality of sub-pixels S. The TFT substrate 2 has a blue sub-pixel S (B) that emits blue light as a sub-pixel. The TFT substrate 2 has sub-pixels S of three colors other than blue. An example of the TFT substrate 2 includes a red sub pixel S (R), a green sub pixel S (G), and a white sub pixel S (W) in addition to the blue sub pixel S (B). As will be described later, in the example of FIG. 2, one blue sub-pixel S (B) is provided for every two pixels P. That is, the number of blue sub-pixels S (B) is reduced compared to the number of pixels P.

  FIG. 3 is a cross-sectional view showing a cross section of each sub-pixel, and a cut surface thereof is indicated by a line III-III in FIG. FIG. 4 is a circuit diagram showing a circuit formed in each sub-pixel.

  As shown in FIG. 3, the TFT substrate 2 has a substrate 10. The substrate 10 is, for example, a glass substrate or a resin substrate. The TFT substrate 2 has a circuit layer 3. The circuit layer 3 includes wiring. In the circuit layer 3, scanning lines Lg extending in the horizontal direction, video signal lines Ld extending in the vertical direction, and power supply lines Ls extending in the vertical direction are formed as wirings (see FIG. 4). .

  In the circuit layer 3, a pixel control circuit Sc (see FIG. 4) provided in each subpixel S is formed. The pixel control circuit Sc includes a TFT and a capacitor, and controls current supply to the organic light emitting diode Od formed in each subpixel S (the organic light emitting diode corresponds to the light emitting element in the claims). As will be described later, the organic light emitting diode Od includes a pixel electrode 11, an organic layer 12, and a common electrode 13. As shown in FIG. 4, the pixel control circuit Sc includes a driving TFT 31, a storage capacitor 32, and a switching TFT 33. The gate of the switching TFT 33 is connected to the scanning line Lg, and the drain of the switching TFT 33 is connected to the video signal line Ld. The source of the switching TFT 33 is connected to the storage capacitor 32 and the gate of the driving TFT 31. The drain of the driving TFT 31 is connected to the power supply line Ls, and the organic light emitting diode Od is connected to the source of the driving TFT 31. When the gate voltage is applied to the scanning line Lg, the switching TFT 33 is turned on. At this time, when a video signal is supplied from the video signal line Ld, charges are accumulated in the storage capacitor 32. Then, when the electric charge is accumulated in the storage capacitor 32, the driving TFT 31 is turned on, a current flows from the power line Ls to the organic light emitting diode Od, and the organic light emitting diode Od emits light.

  The pixel control circuit Sc is a circuit for controlling current supply to the organic light emitting diode Od, and is a circuit including circuit elements excluding the organic light emitting diode Od among circuit elements formed in each subpixel S. The configuration of the pixel control circuit Sc is not limited to that shown in FIG. For example, the pixel control circuit Sc may further include an auxiliary capacitor for increasing the capacity in addition to the storage capacitor 32.

  As shown in FIG. 3, a planarizing film 4 is formed on the circuit layer 3. The TFT substrate 2 has a pixel electrode 11, an organic layer 12, and a common electrode 13 constituting the organic light emitting diode Od on the upper side of the planarizing film 4. The pixel electrode 11 is formed independently for each sub-pixel S. The organic layer 12 includes a charge transport layer, a charge injection layer, a light emitting layer, and the like, and is formed on the pixel electrode 11. The common electrode 13 is formed on the organic layer 12 and arranged over the plurality of subpixels S. An example of the organic layer 12 is configured such that light of a color corresponding to the color of each sub-pixel S exits from the organic layer 12 (coloring method). The organic layer 12 may be configured such that all the sub-pixels S emit light with the same color (for example, white) (color filter method). In the case of the color filter method, a color filter is formed on the counter substrate 21. In the case of the color filter method, the organic layer 12 may have a common stacked structure in all the subpixels S. The pixel electrode 11 is connected to the pixel control circuit Sc (more specifically, the driving TFT 31 (see FIG. 4)) formed in the circuit layer 3 through a contact hole (not shown) formed in the planarizing film 4. Connected to.

  As shown in FIG. 3, the TFT substrate 2 has a bank layer 8 that partitions two adjacent sub-pixels S. The bank layer 8 is formed on the planarizing film 4 and the pixel electrode 11. The bank layer 8 has an opening A1 at the position of each sub-pixel S (hereinafter, the opening A1 is referred to as a bank opening). The pixel electrode 11 is exposed in the bank opening A1, and the organic layer 12 is in contact with the pixel electrode 11 inside the bank opening A1. When a current flows through the organic layer 12 and the electrodes 11 and 13, light is emitted from the inside of the bank opening A1. As shown in FIG. 3, the common electrode 13 and the organic layer 12 may be covered with a protective layer 14 for preventing moisture from penetrating into the organic layer 12. A filler is disposed between the protective layer 14 and the counter substrate 21, and the counter substrate 21 is attached to the TFT substrate 2 (in FIG. 3, the filler and the counter substrate 21 are omitted).

  The laminated structure formed on the TFT substrate 2 is not limited to this. For example, when the pixel control circuit Sc has an auxiliary capacitor, a metal layer for forming the auxiliary capacitor may be formed between the circuit layer 3 and the pixel electrode 11. In this case, the pixel control circuit Sc is a circuit formed in a layer (the circuit layer 3 and the metal layer) below the pixel electrode 11. Further, the bank layer 8 and the protective layer 14 are not necessarily provided.

  FIG. 5 is a diagram showing a region where the pixel control circuit Sc is formed. FIG. 6 is a diagram showing in more detail the region where the pixel control circuit Sc is formed. In this figure, elements and wirings constituting the pixel control circuit Sc are shown. Hereinafter, a region where the pixel control circuit Sc is formed is referred to as a pixel circuit region E. 5 and 6, symbols E (R), E (G), E (B), and E (W) are the pixel circuit area of the red sub-pixel S (R) and the green sub-pixel S (G). The pixel circuit area corresponds to the pixel circuit area of the blue sub-pixel S (B) and the pixel circuit area of the white sub-pixel S (W), respectively. The pixel circuit region E is a region in which circuit elements of the pixel control circuit Sc are formed. The two video signal lines Ld and the sub-pixels S located on opposite sides of the sub-pixel S are opposite to each other. Defined by two scanning lines Lg. This will be described in detail later.

  As described above, the TFT substrate 2 has the blue subpixel S (B) and the subpixels S of three colors other than blue. In one example, as shown in FIG. 2, the TFT substrate 2 includes a red sub-pixel S (R), a green sub-pixel S (G), and a white sub-pixel S (W) in addition to the blue sub-pixel S (B). have. Each pixel P has a red sub-pixel S (R), a green sub-pixel S (G), and a white sub-pixel S (W). That is, the number of each of these three color sub-pixels S is n per n pixels P. On the other hand, the number of blue sub-pixels S (B) provided in n pixels P adjacent to each other is smaller than n. In one example, as shown in FIG. 2, the number of blue sub-pixels S (B) is one for two adjacent pixels P. The number of blue sub-pixels S (B) may be changed as appropriate. For example, the number of blue sub-pixels S (B) may be two for three adjacent pixels P, or may be one for three adjacent pixels P.

  In this embodiment, since the number of blue sub-pixels S (B) is smaller than the number of pixels P, the blue sub-pixel S (B) is provided in each pixel as compared with the conventional display device. It becomes easy to secure the pixel circuit area. The inventor of the present application shows that when an observer views a high-definition image, blue is less visible than other sub-pixels, so it is difficult to recognize two adjacent blue sub-pixels separately. discovered. In the present embodiment, subpixels S of three colors other than blue are provided in each pixel, while the number of blue subpixels S (B) is smaller than the number of pixels P. Therefore, it is possible to secure the pixel circuit area while suppressing a decrease in image quality for the observer. The sub-pixels of the three colors other than blue are not necessarily the red sub-pixel S (R), the green sub-pixel S (G), and the white sub-pixel S (W). Further, in addition to the sub-pixels of three colors, sub-pixels such as yellow and magenta may be included. Furthermore, the number of sub-pixels other than the blue sub-pixel S (B) may not be three. For example, the sub pixel other than the blue sub pixel S (B) may be composed of a red sub pixel S (R) and a green sub pixel S (G). Note that the color of the sub-pixel whose number is reduced compared to the number of the pixels P is not necessarily limited to blue, and the image quality in view of the fineness due to the reduction of the number of sub-pixels is acceptable. If possible, a color other than blue may be used.

  In the present embodiment, as described above, the number of blue sub-pixels S (B) is reduced. Therefore, when the average of the area of the pixel circuit region of each sub-pixel S in one pixel P is E, the area of the pixel circuit region of the blue sub-pixel S (B) included in one pixel P is larger than the average E. Small (this is because, in FIG. 5 as an example, only one half of the pixel circuit area of the blue sub-pixel S (B) is included in one pixel P). On the other hand, each of the areas of the pixel circuit regions of the other three-color sub-pixels S is larger than the average E. In other words, the area of the pixel circuit region of the blue sub-pixel S (B) included in one pixel P is smaller than the area of the pixel circuit region of the sub-pixel S of the other color.

  In one example, the area of the pixel circuit region of the blue sub-pixel S (B) (the area included in the two adjacent pixels P) is substantially equal to the area of the pixel circuit region of one sub-pixel S that emits light of another color. Is the same. The area of the pixel circuit region of the blue subpixel S (B) is not limited to this. For example, the area of the pixel circuit region of the blue subpixel S (B) may be slightly larger than the area of the pixel circuit region of one subpixel S that emits light of another color. The areas of the pixel circuit areas of the sub-pixels S of three colors other than blue may be different from each other.

  When the ratio (S2 / S1) of the area (S2) of the light emitting region to the area (S1) of the pixel circuit region in each subpixel is defined as the light emitting area ratio, the light emitting area ratio of the blue subpixel S (B) It may be larger than the light emission area ratio of the subpixels of three colors. The light emitting region can be defined as the region of the bank opening A1 when the bank layer 8 is provided on the TFT substrate 2. Further, the light emitting region may be defined as a region of the pixel electrode 11. In one example, the pixel circuit area of the blue subpixel S (B) in one pixel P is smaller than the pixel circuit area of the subpixels of other colors, while the light emission area of the blue subpixel S (B) in one pixel P is It has the same size as the light emitting area of other color sub-pixels.

  By setting the light emission area ratio as described above, it is possible to suppress the deterioration of the organic layer 12 from being accelerated. That is, when the light emission area of the blue sub-pixel S (B) included in one pixel P is made smaller than the light emission areas of the sub-pixels of other colors, as in the pixel circuit area, the blue luminance is ensured. In order to do so, it is necessary to increase the current supplied to the organic light emitting diode Od of the blue sub-pixel S (B). As a result, the organic layer 12 tends to deteriorate in the blue sub-pixel S (B). By making the light emission area ratio of the blue subpixel S (B) larger than the light emission area ratios of the other three color subpixels, such deterioration of the organic layer 12 can be suppressed.

  The light emitting area ratios of the three sub-pixels S other than blue may be different from each other. In this case, the light emission area ratio of the blue subpixel S (B) may be larger than the minimum value and smaller than the maximum value among the light emission area ratios of the other three color subpixels S. Further, the light emission area ratio of the blue sub-pixel S (B) may be larger than the maximum value among the light emission area ratios of the other three-color sub-pixels S.

  In one example, the area of the light emitting region of the blue subpixel S (B) included in one pixel P is the same as the area of the light emitting region of each of the other three color subpixels S. That is, when the average of the areas of the light emitting regions in one pixel P is F, the area of the light emitting region of the blue sub-pixel S (B) included in one pixel P is F. In another example, the area of the light emitting region of the blue sub-pixel S (B) included in one pixel P may be larger than F. This makes it easier to increase the brightness of blue. The light emission area of the blue sub pixel S (B) may be larger than the pixel circuit area of the blue sub pixel S (B).

  In the example of FIG. 2, each pixel P is a rectangle and is composed of two columns arranged in the vertical direction. In FIG. 2, when attention is paid to two adjacent pixels P in the horizontal direction, four sub-pixels S are arranged in the horizontal direction in the first column. Specifically, red sub-pixels S (R) and green sub-pixels S (G) are alternately arranged. In the second column, three subpixels S are arranged in the horizontal direction. One of the three subpixels S is a blue subpixel S (B). Therefore, two adjacent pixels P are composed of seven subpixels S.

  In the example of FIG. 2, the blue sub-pixel S (B) is disposed across two adjacent pixels P. In other words, the blue sub-pixel S (B) is shared by the two pixels P, half of the blue sub-pixel S (B) is located in the area of one pixel P, and the other half of the blue sub-pixel S (B). Is located in the area of the other pixel P. The blue sub-pixel S (B) is disposed between two sub-pixels S included in two adjacent pixels P. In the example of FIG. 2, the blue sub pixel S (B) is disposed between two white sub pixels S (W). The arrangement of the blue sub-pixel S (B) is not limited to this. For example, the blue sub pixel S (B) may be provided only in one of the two adjacent pixels P, and the blue sub pixel S (B) may not be provided in the other.

  The arrangement of the sub-pixels S in each pixel P is not limited to the example shown in FIG. For example, the arrangement of the sub-pixels S may be a stripe format. That is, the sub-pixels S of each pixel P may be arranged in one column in the horizontal direction. Even in this case, the blue sub-pixel S (B) may be arranged across the two pixels P. Further, the arrangement of the sub-pixels S may be a mosaic format.

  Two wirings of the same type are preferably formed between the pixel control circuit Sc of the sub-pixel S adjacent to the blue sub-pixel S (B) and the pixel control circuit Sc of the blue sub-pixel S (B). . By doing so, the wiring passing through the pixel circuit area of the blue sub-pixel S (B) can be reduced. In the circuit layer 3, a plurality of video signal lines Ld extending in the vertical direction and arranged in the horizontal direction are formed. In the example of FIG. 6, two video signals are provided between the pixel control circuit Sc of the blue sub pixel S (B) and the pixel control circuit Sc of the sub pixel S adjacent to the blue sub pixel S (B) in the horizontal direction. A line Ld is formed. In other words, two video signal lines are formed on the right side and the left side of the pixel control circuit Sc of the blue sub-pixel S (B). Thereby, the video signal line passing through the pixel circuit region E of the blue sub-pixel S (B) can be eliminated, and the layout of the pixel control circuit Sc is facilitated. In the example of FIG. 6, the white sub-pixel S (W) is adjacent to the blue sub-pixel S (B) in the horizontal direction, and two video signal lines Ld are formed between them.

  As shown in FIG. 6, the circuit layer 3 has a plurality of power supply lines Ls extending in the vertical direction. The plurality of power supply lines Ls are arranged in the horizontal direction. The power supply line Ls may intersect with the pixel electrode 11 of the blue sub-pixel S (B) in plan view. That is, the power supply line Ls may pass through the pixel circuit region E (B) of the blue subpixel S (B). The pixel control circuit Sc of the blue sub pixel S (B) may be connected to the power supply line Ls. Further, the power supply line Ls passes between the pixel control circuits Sc of the two subpixels S among the subpixels S of three colors other than blue. Both the pixel control circuits Sc of the two subpixels S are connected to the power supply line Ls. In the example of FIG. 6, the power supply line Ls is provided between the pixel control circuit Sc of the red sub pixel S (R) and the pixel control circuit Sc of the green sub pixel S (G), and two white sub pixels S (W ) Between the pixel control circuits Sc. According to this layout of the power supply lines Ls, the number of power supply lines Ls can be reduced, so that the pixel circuit region E can be easily secured. The layout of the power supply line Ls is not limited to the example shown in FIG. For example, the power supply line Ls is similar to the video signal line Ld, the pixel control circuit Sc of the sub pixel S (W) adjacent to the blue sub pixel S (B), and the pixel control circuit Sc of the blue sub pixel S (B). Between the two.

  As shown in FIG. 6, a plurality of scanning lines Lg extending in the horizontal direction are formed in the circuit layer 3 of the TFT substrate 2. The plurality of scanning lines Lg are arranged in the vertical direction. The scanning line Lg passes between the pixel control circuits Sc of two subpixels S adjacent in the vertical direction.

  The pixel circuit region E described above is defined by two video signal lines Ld located on opposite sides of the sub pixel S and two scanning lines Lg arranged on opposite sides of the sub pixel S. It is an area. When two subpixels S correspond to the area defined by the two video signal lines Ld and the two scanning lines Lg, half of the area defined by the two video signal lines Ld and the two scanning lines Lg. Is a pixel circuit region E of one sub-pixel S. Referring to FIG. 6, when attention is paid to the pixel circuit region E (G) of the green subpixel S (G) and the pixel circuit region E (R) of the red subpixel S (R) that are adjacent in the horizontal direction, The video signal line Ld is not formed between the two regions E (G) and E (R). In this case, half of the region surrounded by the two video signal lines Ld and the two scanning lines Lg sandwiching the two regions E (G) and E (R) is one pixel circuit region E (G), E ( R).

  As described above, the area of the pixel circuit region E of the blue sub-pixel S (B) included in one pixel P is smaller than the area of the pixel circuit region E of the sub-pixel S of the other color. As shown in FIG. 6, the video signal line Ld and the scanning line Lg extend in the vertical direction and the horizontal direction while being bent so that the pixel circuit area of the blue sub-pixel S (B) becomes small in this way. . The power supply line Ls may extend linearly in the vertical direction as shown in FIG.

  As shown in FIG. 6, the pixel control circuit Sc of each sub-pixel S is connected to the video signal line Ld adjacent thereto. The blue subpixel S (B) is connected to one of the two video signal lines Ld that sandwich the blue subpixel S (B). In one example, the signal supplied to the blue subpixel S (B) through the video signal line Ld corresponds to the average luminance of two pixels P adjacent in the horizontal direction. As another example, the signal supplied to the blue sub-pixel S (B) may correspond to only the luminance of one pixel P of the two adjacent pixels P in the horizontal direction.

  FIG. 7 is a plan view showing a modification of the layout of the pixels P on the TFT substrate 2. FIG. 8 is a diagram illustrating a region where the pixel control circuit Sc according to the example of FIG. 7 is formed. In these drawings, the same parts as those described so far are denoted by the same reference numerals. Here, items different from those described so far will be mainly described, and items not described are the same as those in the examples of FIGS.

  In the example of FIG. 7, each pixel P is composed of two columns arranged in the horizontal direction. When attention is paid to two adjacent pixels P in the vertical direction, four sub-pixels S are arranged in the vertical direction in the first column. Specifically, in the example of FIG. 7, the red sub-pixel S (R) and the green sub-pixel S (G) are alternately arranged in the first column. In the second column, three subpixels S are arranged in the vertical direction. One of the three subpixels S is a blue subpixel S (B). Therefore, two pixels P adjacent in the vertical direction are configured by seven sub-pixels.

  As shown in FIG. 7, the blue sub-pixel S (B) may be disposed across two adjacent pixels P in the vertical direction. In other words, the blue sub-pixel S (B) is shared by two adjacent pixels P in the vertical direction, and half of the blue sub-pixel S (B) is located in the area of one pixel P, and the blue sub-pixel S (B ) May be located in the area of the other pixel P. In the example of FIG. 7, the blue sub pixel S (B) is disposed between two white sub pixels S (W).

  As shown in FIG. 8, two scans are performed between the pixel control circuit Sc of the blue sub pixel S (B) and the pixel control circuit Sc of the sub pixel S adjacent to the blue sub pixel S (B) in the vertical direction. A line Lg may be formed. In other words, two scanning lines Lg may be formed on each of the upper side and the lower side of the pixel control circuit Sc of the blue sub-pixel S (B). Thereby, the scanning line Lg passing through the pixel circuit region of the blue sub-pixel S (B) can be eliminated, and the layout of the pixel control circuit Sc is facilitated. In the example of FIG. 8, the white sub pixel S (W) is adjacent to the blue sub pixel S (B) in the vertical direction, and two scanning lines Lg are formed between them. Each of the video signal line Ld and the power supply line Ls passes between the pixel control circuits Sc of two sub-pixels S adjacent in the horizontal direction. As described above, in the example of FIGS. 7 and 8, the blue sub-pixel S (B) is disposed so as to straddle two adjacent pixels P in the vertical direction. As a result, the wiring that passes through the pixel circuit region E (B) of the blue subpixel S (B) can be eliminated.

  Also in the example of FIG. 8, as in the example of FIG. 6, the area of the pixel circuit region E (B) of the blue subpixel S (B) included in one pixel P is the pixel circuit region of the subpixel S of another color. It is smaller than the area of E. The video signal line Ld and the power supply line Ls extend in the vertical direction while being bent so that the pixel circuit region E (B) of the blue sub-pixel S (B) becomes small. Further, the scanning line Lg extends in the horizontal direction while being bent so that the pixel circuit region E (B) of the blue sub-pixel S (B) becomes small.

  A signal supplied to the blue sub-pixel S (B) through the video signal line Ld corresponds to the average luminance of two pixels P adjacent in the vertical direction. The signal supplied to the blue sub-pixel S (B) may correspond to only the luminance of one pixel P among the two pixels P adjacent in the vertical direction.

  As described above, each pixel P is provided with sub-pixels S of three colors other than blue. On the other hand, the number of blue sub-pixels S (B) provided in adjacent n pixels P is smaller than n. As a result, it is possible to secure the pixel circuit area while suppressing deterioration in image quality for the observer.

  Further, the light emission area ratio of the blue subpixel S (B) is larger than the light emission area ratios of the other three color subpixels. It is possible to suppress the deterioration of the organic layer 12 in the blue subpixel S (B) from being accelerated.

  The present invention is not limited to the embodiment described above, and various changes may be made.

  As described above, the arrangement of the sub-pixels S is not limited to that shown in FIGS. 2 and 7, and may be a stripe format or a mosaic format.

  Further, the light emission area ratio of the blue sub-pixel S (B) may be the same as the light emission area ratios of the other three color sub-pixels.

1 organic EL display device, 2 TFT substrate, 3 circuit layer, 4 planarization film, 8 bank layer, E pixel circuit area, S sub pixel, S (B) blue sub pixel, S (R) red sub pixel, S ( W) S white subpixel, S (G) green subpixel, 10 substrate, 11 pixel electrode, 12 organic layer, 13 common electrode, 14 protective layer, 21 counter substrate, 32 storage capacitor, Od organic light emitting diode (light emitting element) , Sc Pixel control circuit, 31 driving TFT, 32 storage capacitor, 33 switching TFT.

Claims (16)

A plurality of pixels each having a plurality of sub-pixels;
A light emitting element including a pixel electrode provided in each of the plurality of sub-pixels;
A pixel control circuit that is provided in each of the plurality of sub-pixels and controls current supply to the light-emitting element,
As the plurality of sub-pixels, a blue sub-pixel that emits light in blue and a sub-pixel of three colors other than blue are provided,
Each of the plurality of pixels has sub-pixels of three colors other than the blue,
The display device, wherein the number of the blue sub-pixels provided in adjacent n pixels is smaller than n. The display device according to claim 1,
When the ratio (S2 / S1) of the area (S2) of the light emitting region to the area (S1) of the region where the pixel control circuit is formed in each of the sub pixels is defined as the light emitting area ratio, The light emitting area ratio is larger than the minimum value among the light emitting area ratios of the three color sub-pixels. The display device according to claim 1,
When the ratio (S2 / S1) of the area (S2) of the light emitting region to the area (S1) of the region where the pixel control circuit is formed in each of the sub pixels is defined as the light emitting area ratio, The light emitting area ratio is larger than the maximum value among the light emitting area ratios of the three color sub-pixels. The display device according to claim 1,
When the area of the region where the pixel control circuit is formed in each sub-pixel is a circuit area, the circuit area of the blue sub-pixel included in one pixel is smaller than the circuit area of the sub-pixels of other colors A display device characterized by that. The display device according to claim 1,
The blue sub-pixel is disposed across two pixels. A display device, wherein: The display device according to claim 1,
Two video signal lines are arranged between the pixel control circuit for the blue sub-pixel and the pixel control circuit for a sub-pixel of another color adjacent to the blue sub-pixel. apparatus. The display device according to claim 1,
Two scanning lines are arranged between the pixel control circuit of the blue sub-pixel and the pixel control circuit of a sub-pixel of another color adjacent to the blue sub-pixel. . The display device according to claim 1,
A wiring that intersects the pixel electrode of the blue sub-pixel in plan view and passes between pixel control circuits of two sub-pixels of the three-color sub-pixels is formed,
Both of the pixel control circuits of the two sub-pixels are connected to the wiring. The display device according to claim 1,
Two adjacent pixels have a first column in which four sub-pixels are arranged in a first direction, and a second column in which three sub-pixels are arranged in the first direction,
One of the three sub-pixels in the second column is the blue sub-pixel. A first pixel having a plurality of sub-pixels;
A second pixel having a plurality of sub-pixels and adjacent to the first pixel;
A pixel control circuit provided in each of the plurality of sub-pixels,
The plurality of sub-pixels includes a first color sub-pixel,
The first color sub-pixel is disposed across the first pixel and the second pixel,
The display device, wherein the pixel control circuit included in the first color sub-pixel is formed across the first pixel and the second pixel. The display device according to claim 10.
The display device, wherein the first color is a color having the lowest visibility among the colors of the plurality of sub-pixels. The display device according to claim 10.
The display device according to claim 1, wherein the first color is blue. The display device according to claim 10.
Of the pixel control circuit provided in the first color sub-pixel, the area of the portion located in the region of the first pixel is a pixel provided in a sub-pixel of a color different from the first color. A display device characterized by being smaller than an area of a control circuit. The display device according to claim 10.
Two video signals between a pixel control circuit provided in the first color sub-pixel and a pixel control circuit provided in another color sub-pixel adjacent to the first color sub-pixel. A display device in which lines are arranged. The display device according to claim 10.
Two scanning lines between a pixel control circuit provided in the first color sub-pixel and a pixel control circuit provided in another color sub-pixel adjacent to the first color sub-pixel. A display device, wherein: The display device according to claim 10.
Each of the plurality of sub-pixels includes a light emitting layer and an anode and a cathode electrically connected to the light emitting layer,
The pixel control circuit is electrically connected to the anode and the cathode and controls current supply to the light emitting element.

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