KR102372062B1 - Display Device - Google Patents

Abstract

An object of the present invention is to provide a display device capable of realizing display with high luminance.
The display device includes a pixel having a first subpixel of a first color, a second subpixel of a second color, a third subpixel of a third color, and a fourth subpixel of a fourth color, and the first subpixel , each of the second subpixel, the third subpixel and the fourth subpixel has a light emitting element emitting light of a third color, and each of the first subpixel, the second subpixel and the fourth subpixel includes: and a quantum dot layer that converts the wavelength of light of the third color generated from the light emitting device, wherein the first sub-pixel has a first color filter of the first color, and the second sub-pixel has a second color of the second color It has a color filter, and the fourth sub-pixel emits light of the fourth color without passing through the color filter.

Description

Display Device}

The present invention relates to a display device.

A display device using an organic light-emitting diode (OLED) as a light-emitting element is known (Patent Documents 1 to 3). As such a display device, a display device using a blue OLED as a light emitting element and using a quantum dot layer as a light conversion layer for converting the wavelength of light emitted from the OLED has been developed (Patent Document 3).

Patent Document 1: Japanese Patent Publication No. 5124051 Patent Document 2: Japanese Patent Laid-Open No. 2006-308768 Patent Document 3: Korean Patent Publication No. 10-2017-0096583

When the quantum dot layer is used as the light conversion layer, since the conversion rate by the quantum dot layer is not 100%, in the subpixel of each color, light from the quantum dot layer is emitted through the color filter. In the structure described in Patent Document 3, in the red sub-pixel, a quantum dot layer that converts blue light into red light and a red color filter are sequentially disposed on the blue OLED. In the green sub-pixel, a quantum dot layer for converting blue light into green light and a green color filter are sequentially disposed on the blue OLED. In the blue sub-pixel, a blue color filter is disposed on the blue OLED without passing through the quantum dot layer.

However, in the configuration in which the color filter is disposed, the luminous efficiency of the sub-pixel decreases due to absorption of light in the color filter, and it is difficult to realize high luminance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device capable of realizing display with high luminance in view of the above problems.

According to one aspect of the present invention, a pixel having a first subpixel of a first color, a second subpixel of a second color, a third subpixel of a third color, and a fourth subpixel of a fourth color, Each of the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel includes a light emitting element emitting light of the third color, and the first sub-pixel, the second Each of the sub-pixel and the fourth sub-pixel has a quantum dot layer for converting a wavelength of light of the third color generated from the light emitting device, and the first sub-pixel includes a first color filter of the first color wherein the second sub-pixel includes a second color filter of the second color, and the fourth sub-pixel emits light of the fourth color without passing through the color filter. provided

According to the present invention, display with high luminance can be realized.

1 is a block diagram showing a schematic configuration of a display device according to a first embodiment of the present invention.
2 is a diagram showing an example of arrangement of pixels and sub-pixels in a panel of the display device according to the first embodiment of the present invention.
3 is a circuit diagram showing a schematic configuration of a sub-pixel of the display device according to the first embodiment of the present invention.
4 is a schematic diagram showing a schematic configuration of a pixel of the display device according to the first embodiment of the present invention and light emission thereof.
5 is an xy chromaticity diagram illustrating color coordinates of a cyan sub-pixel of the display device according to the first embodiment of the present invention.
6 is a schematic diagram showing a schematic configuration of a pixel of a display device according to a second embodiment of the present invention and light emission thereof.
7 is an xy chromaticity diagram illustrating color coordinates of magenta sub-pixels of the display device according to the second embodiment of the present invention.
8 is a schematic diagram showing a schematic configuration of a pixel of a display device according to a third embodiment of the present invention and light emission thereof.
9 is an xy chromaticity diagram illustrating color coordinates of a yellow or white sub-pixel of a display device according to a third embodiment of the present invention.
10 is a schematic diagram showing a schematic configuration of a pixel of a display device according to a fourth embodiment of the present invention and light emission thereof.
11 is an xy chromaticity diagram illustrating color coordinates of cyan sub-pixels of a display device according to a fourth embodiment of the present invention.
12 is a schematic diagram showing a schematic configuration of a pixel of a display device according to a fifth embodiment of the present invention and light emission thereof.
13 is an xy chromaticity diagram illustrating color coordinates of yellow or white sub-pixels of a display device according to a fifth embodiment of the present invention.
14 is a schematic diagram showing a schematic configuration of a pixel of a display device according to a sixth embodiment of the present invention.
15 is a schematic diagram showing a schematic configuration of a pixel of a display device according to a seventh embodiment of the present invention.

<First embodiment>

A display device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5 .

First, a schematic configuration of the display device according to the present embodiment will be described with reference to FIGS. 1 to 3 . 1 is a block diagram showing a schematic configuration of a display device according to the present embodiment. 2 is a diagram showing an example of arrangement of pixels and sub-pixels in a panel of the display device according to the present embodiment. 3 is a circuit diagram showing a schematic configuration of a sub-pixel of the display device according to the present embodiment.

The display device according to the present embodiment uses an OLED as a light emitting element in a pixel, and displays an image based on input RGB data. The use of the display device according to the present embodiment may be, for example, a computer image output device, a television receiver, a smartphone, a game machine, or the like, but is not particularly limited.

As shown in FIG. 1 , the display device includes a timing controller TCON 1 , a panel 2 , a plurality of source drive ICs SDIC 3 , and a plurality of gate drive ICs GDIC 4 . The panel 2 includes a plurality of pixels arranged in a matrix, and functions as a display unit for displaying an image.

The timing controller 1 is communicatively connected to the plurality of source drive ICs 3 and the plurality of gate drive ICs 4 . The timing controller 1 includes a plurality of source drive ICs 3 and a plurality of gate drive ICs 4 based on timing signals (vertical synchronization signal, horizontal synchronization signal, data enable signal, etc.) input from an external system. control the timing of the operation.

As will be described later, the pixels in the panel 2 include a cyan (C) sub-pixel in addition to the red (R), green (G), and blue (B) sub-pixels. 4 It has as a sub-pixel. The timing controller 1 generates RGBC data representing the luminance of each sub-pixel of the panel 2 based on RGB data that is an input signal input from an external system, and converts the RGBC data to a plurality of source drive ICs 3 . output as an output signal to Note that the number of source drive ICs 3 and gate drive ICs 4 is not limited to those shown.

Each of the plurality of source drive ICs 3 supplies voltages (video signals) for driving a plurality of pixels in the panel 2 through a plurality of data lines under the control of the timing controller 1 . Each of the plurality of gate drive ICs 4 supplies a scan signal to a plurality of pixels in the panel 2 through a plurality of gate lines under the control of the timing controller 1 . In this way, the timing controller 1 functions as a display control device that controls the operation of the entire display device.

2A and 2B are arrangement diagrams of the pixels Pixel 20 and subpixels 21R, 21G, 21B and 21C in the panel 2, respectively. The panel 2 includes a plurality of pixels 20 arranged to form a plurality of rows and a plurality of columns. Each of the plurality of pixels 20 includes a sub-pixel 21R emitting red light, a sub-pixel 21G emitting green light, a sub-pixel 21B emitting blue light, and cyan emitting light. It includes a sub-pixel 21C. Also, hereinafter, when there is no need to distinguish colors of the sub-pixels 21R, 21G, 21B, and 21C, it is simply referred to as 'sub-pixel 21'.

The sub-pixels 21R, 21G, 21B, and 21C are arranged side by side in a predetermined direction in the pixel 20 as shown in FIG. 2A , for example. In this case, as will be described later, in the pixel 20 , in the order of the sub-pixel 21R, the sub-pixel 21G, the sub-pixel 21C, and the sub-pixel 21B, or the sub-pixel 21R, the sub-pixel ( 21C), the sub-pixel 21G, and the sub-pixel 21B are preferably arranged side by side in this order.

In addition, the sub-pixels 21R, 21G, 21B, and 21C may be arranged in a grid shape in the pixel 20 as shown in Fig. 2(b), for example. In this case, the sub-pixels 21R, 21G, 21B, and 21C may be arranged in a grid shape in an arbitrary positional relationship.

The luminance of the sub-pixels 21R, 21G, 21B, and 21C is controlled in accordance with the voltage output from the source drive IC 3 . When the sub-pixels 21R, 21G, 21B, and 21C emit light at a predetermined luminance ratio, the pixel 20 can display various colors by additive color mixing.

As described above, the display device of the present embodiment includes a cyan sub-pixel 21C as the fourth sub-pixel, and has a pixel configuration corresponding to the RGBC four-color display.

In addition, in this specification, red is called a 1st color, green is a 2nd color, blue is a 3rd color, cyan, magenta, yellow, or white may be called a 4th color. Also, in this specification, the red subpixel is the first subpixel, the green subpixel is the second subpixel, and the blue subpixel is the third subpixel, cyan, magenta, yellow or white subpixel is sometimes called the fourth subpixel. In addition, in this specification, a red color filter may be called a 1st color filter, and a green color filter may be called a 2nd color filter.

Moreover, in this embodiment, the quantum dot layer of each color as a light conversion layer is formed suitably in a sub-pixel. The quantum dot layer of each color functions as a wavelength conversion layer for emitting light of each color by converting the wavelength of the incident light emitted from the OLED. Specifically, for example, the red quantum dot layer converts blue light emitted from the blue OLED to emit red light. The green quantum dot layer converts blue light emitted from the blue OLED to emit green light. The cyan-colored quantum dot layer converts blue light emitted from the blue OLED to emit cyan-colored light. The yellow quantum dot layer converts blue light emitted from the blue OLED to emit yellow light. The quantum dot layer is constituted of a layer such as a resin in which quantum dots are dispersed, for example, made of a semiconductor material having a particle size, material, or the like corresponding to the output wavelength.

3 shows a schematic configuration of the sub-pixel 21 . In FIG. 3 , a subpixel 21 included in any one pixel 20 among a plurality of pixels 20 , a source drive IC 3 connected to the subpixel 21 , and the subpixel One gate drive IC 4 connected to 21 is shown.

The sub-pixel 21 includes a scan transistor M1 , a driving transistor M2 , and a diode D . The diode D is a light emitting element of a display device, and is an OLED. The scan transistor M1 and the driving transistor M2 are, for example, thin film transistors (TFT). In the present embodiment, it is assumed that the scan transistor M1 and the driving transistor M2 are of an n-channel type. However, the scan transistor M1 and the driving transistor M2 may be of a p-channel type. Also, when the driving transistor M2 is a p-channel type, the circuit configuration of the sub-pixel 21 may be different from that shown in FIG. 3 .

The cathode of the diode D is connected to a potential line that supplies the potential VSS. The anode of the diode D is connected to the source of the driving transistor M2. A drain of the driving transistor M2 is connected to a potential line that supplies a potential VDD. The gate of the driving transistor M2 is connected to the source of the scan transistor M1.

A data line DL is connected to the drain of the scan transistor M1. The source drive IC 3 supplies an image signal to the drain of the scan transistor M1 through the data line DL. A gate line GL is connected to the gate of the scan transistor M1. The gate drive IC 4 supplies a control signal to the gate of the scan transistor M1 through the gate line GL. The scan transistor M1 is turned on or off according to the level of the control signal input to the gate.

The current flowing between the drain and source of the driving transistor M2 is a voltage (video signal) input from the source driver IC 3 to the gate of the driving transistor M2 through the data line DL and the scan transistor M1. controlled based on A current flowing between the drain and source of the driving transistor M2 is supplied to the diode D, and the diode D emits light with a luminance corresponding to the current. In this way, the diode D emits light with a luminance corresponding to the video signal input to the sub-pixel 21 .

Next, the pixel 20 of the display device according to the present embodiment will be further described with reference to FIGS. 4 and 5 . 4A is a cross-sectional view showing a schematic configuration of a pixel 20 of the display device according to the present embodiment. Fig. 4B is a schematic diagram showing light emission of the pixel 20 of the display device according to the present embodiment. 5 is an xy chromaticity diagram illustrating color coordinates of a cyan sub-pixel 21C.

As shown in Fig. 4(a) , each pixel 20 in the panel 2 has a cyan (cyan) ( cyan) color sub-pixel 21C.

The panel 2 includes an element substrate 100 and a color filter substrate 200 . The color filter substrate 200 is disposed so as to face the element formation surface of the element substrate 100 . The display device according to the present embodiment is a top light emission type in which light is emitted from the element formation surface side of the glass substrate 30 of the element substrate 100 . That is, in the display device according to the present embodiment, the element formation surface side of the glass substrate 30 in the element substrate 100 is the display surface side.

The element substrate 100 has a glass substrate 30 which is a transparent substrate, and the blue OLED 32 which is a light emitting element which radiates blue light. In the following, the case of using the glass substrate 30 and the glass substrates 40, 50, and 60 described later as the substrate of the panel 2 will be described as an example. A transparent substrate may be used.

In each pixel 20 , on the element formation surface of the glass substrate 30 , four anode electrodes 34 made of metal electrodes are formed so as to correspond to the sub-pixels 21R, 21G, 21B, and 21C. On each anode electrode 34 , a blue organic light emitting layer 36 made of an organic light emitting material emitting blue light is formed. On each blue organic light-emitting layer 36 , a common cathode electrode 38 made of a transparent electrode is formed.

As described above, in each pixel 20 , an OLED 32 having an anode electrode 34 , a blue organic light emitting layer 36 , and a cathode electrode 38 is formed for each of the sub-pixels 21R, 21G, 21B, and 21C. has been A sealing film (not shown) or the like is formed on the entire surface of the glass substrate 30 on which the cathode electrode 38 is formed.

On the other hand, the color filter substrate 200 includes a glass substrate 40 which is a transparent substrate, color filters 42R, 42G, and quantum dot layers 44R, 44G, and 46G.

A red color filter 42R is formed on the surface of the glass substrate 40 facing the element substrate 100 so as to face the OLED 32 of the red subpixel 21R. A red quantum dot layer 44R is formed on the surface of the color filter 42R facing the element substrate 100 . The red quantum dot layer 44R functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit red light. Light emitted from the quantum dot layer 44R includes unconverted blue light together with red light.

As described above, the red sub-pixel 21R including the blue OLED 32 , the red quantum dot layer 44R and the red color filter 42R is configured.

Moreover, on the surface of the glass substrate 40 facing the element substrate 100, the green color filter 42G is formed so that it may oppose the OLED 32 of the green sub-pixel 21G. A green quantum dot layer 44G is formed on the surface of the color filter 42G facing the element substrate 100 . The green quantum dot layer 44G functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit green light. Light emitted from the quantum dot layer 44G includes unconverted blue light together with green light.

As described above, the green sub-pixel 21G including the blue OLED 32 , the green quantum dot layer 44G and the green color filter 42G is configured.

In addition, on the surface of the glass substrate 40 facing the element substrate 100, a green quantum dot layer 46G is formed so as to face the OLED 32 of the cyan subpixel 21C. The green quantum dot layer 46G functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit green light. Light emitted from the quantum dot layer 46G includes unconverted blue light together with green light. The quantum dot layer 46G is formed with a thickness adjusted so that the conversion rate for emitting cyan light, which is a mixed light of green light and blue light, is obtained. Therefore, for example, the quantum dot layer 46G is preferably formed thinner than the quantum dot layers 44R and 44G.

In this way, the blue OLED 32 and the cyan sub-pixel 21C having the green quantum dot layer 46G are configured. In addition, the sub-pixel 21C does not include a cyan color filter or other color filters. That is, the sub-pixel 21C emits cyan color light without passing through the cyan color filter or other color filters. In addition, when a sub-pixel as used herein does not have a color filter, a case in which the sub-pixel physically does not have a color filter and a case in which the sub-pixel has a transparent color filter are also included.

On the other hand, on the surface of the glass substrate 40 facing the element substrate 100, neither a color filter nor a quantum dot layer is formed so as to face the OLED 32 of the blue sub-pixel 21B. Therefore, the blue sub-pixel 21B includes the blue OLED 32 , but does not include a blue color filter, other color filters, or a quantum dot layer. That is, the sub-pixel 21B emits blue light without passing through the blue color filter or other color filters.

In addition, on the entire surface of the glass substrate 40 on which the color filters 42R, 42G and the quantum dot layers 44R, 44G, and 46G are formed, a sealing film (not shown) or the like is formed.

In this way, the pixel 20 having the sub-pixels 21R, 21G, 21B, and 21C is configured.

Fig. 4(b) schematically shows light emission of each of the sub-pixels 21R, 21G, 21B, and 21C. In Fig. 4(b), an arrow Lr indicates red light, an arrow Lg indicates green light, and an arrow Lb indicates blue light, and the number of each arrow indicates the amount of light. In addition, the arrangement of each component shown in Fig. 4(b) does not coincide with the arrangement of each component shown in Fig. 4(a) for convenience.

In the red sub-pixel 21R, first, the blue light Lb is emitted from the OLED 32 as shown in FIG. 4(b) . Then, the blue light Lb is converted into the red light Lr by the red quantum dot layer 44R and is emitted from the quantum dot layer 44R. At this time, since the conversion rate of the quantum dot layer 44R is not 100%, the unconverted blue light Lb is emitted from the quantum dot layer 44R together with the red light Lr. In addition, in the quantum dot layer 44R, a part of the blue light Lb loses activity or is absorbed. Subsequently, the red light Lr emitted from the quantum dot layer 44R passes through the red color filter 42R and is emitted from the display surface of the panel 2 . At this time, the blue light Lb emitted from the quantum dot layer 44R is absorbed by the color filter 42R.

In the green subpixel 21G, first, the blue light Lb is emitted from the OLED 32 as shown in FIG. 4(b) . Then, the blue light Lb is converted into green light Lg by the green quantum dot layer 44G and is emitted from the quantum dot layer 44G. At this time, since the conversion rate of the quantum dot layer 44G is not 100%, the unconverted blue light Lb is emitted together with the green light Lg from the quantum dot layer 44G. Also, in the quantum dot layer 44G, a part of the blue light Lb loses activity or is absorbed. Subsequently, the green light Lg emitted from the quantum dot layer 44G passes through the green color filter 42G and is emitted from the display surface of the panel 2 . At this time, the blue light Lb emitted from the quantum dot layer 44G is absorbed by the color filter 42G.

In the cyan sub-pixel 21C, blue light Lb is first emitted from the OLED 32 as shown in FIG. 4(b) . Subsequently, the blue light Lb is converted into green light Lg by the green quantum dot layer 46G and is emitted from the quantum dot layer 46G. At this time, since the quantum dot layer 46G is formed with the thickness adjusted as described above, cyan light including green light Lg and unconverted blue light Lb from the quantum dot layer 46G this is released 5 shows the color coordinates of the cyan sub-pixel 21C. In addition, since the quantum dot layer 46G is formed thinner than the quantum dot layers 44R and 44G, for example, the loss of activity and absorption of the blue light Lb is less than that of the quantum dot layer 44G. Subsequently, cyan light including green light Lg and blue light Lb emitted from the quantum dot layer 46G is emitted from the display surface of the panel 2 without passing through the color filter.

In the blue sub-pixel 21B, first, blue light Lb is emitted from the OLED 32 as shown in FIG. 4(b) . Next, the blue light Lb is emitted from the display surface of the panel 2 as it is without passing through the quantum dot layer or the color filter.

As described above, according to the present embodiment, the pixel 20 includes a sub-pixel 21C having no color filter in addition to the sub-pixels 21R, 21G, and 21B. Since the sub-pixel 21C does not have a color filter, the luminous efficiency is higher than that of the sub-pixels 21R and 21G. As described above, according to the present embodiment, since display can be performed using the sub-pixel 21C having high luminous efficiency, display with high luminance can be realized.

For example, in the present embodiment, light emission of the red sub-pixel 21R and the cyan sub-pixel 21C or the red sub-pixel 21R, the blue sub-pixel 21B, and the cyan sub-pixel ( 21C), white display can be realized. In either case, since white display is realized using the sub-pixel 21C having no color filter, white display with high luminance can be realized.

The sub-pixel 21C as the fourth sub-pixel is a sub-pixel having high luminous efficiency and frequently used for white display. For this reason, it is preferable to arrange|position in the center side rather than the edge side in the pixel 20. For example, when the sub-pixels 21R, 21G, 21B, and 21C are arranged side by side in one direction in the pixel 20 , the sub-pixel 21C is an arrangement of the sub-pixels 21R, 21G, 21B, and 21C. It is preferable that it is arrange|positioned at the 2nd or 3rd position from one end.

As described above, according to the present embodiment, a display with high luminance can be realized in a display device using an OLED and a quantum dot layer.

<Second embodiment>

A display device according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7 . In addition, the same reference numerals are assigned to the same components as those of the display device according to the first embodiment, and descriptions thereof are omitted or simplified.

The basic configuration of the display device according to the present embodiment is the same as that of the display device according to the first embodiment. The display device according to the present embodiment is different from the display device according to the first embodiment in that the pixel 20 has a magenta sub-pixel 21M in place of the cyan sub-pixel 21C. is different

Hereinafter, the pixel 20 in the display device according to the present embodiment will be described with reference to FIGS. 6 and 7 . 6A is a cross-sectional view showing a schematic configuration of a pixel 20 of the display device according to the present embodiment. 6(b) is a schematic diagram showing light emission of the pixel 20 of the display device according to the present embodiment. 7 is an xy chromaticity diagram illustrating color coordinates of a magenta sub-pixel 21M.

As shown in Fig. 6A, the pixel 20 in the panel 2 is magenta in addition to the red sub-pixel 21R, the green sub-pixel 21G, and the blue sub-pixel 21B. It also has a color sub-pixel 21M.

A red quantum dot layer 46R is formed on the surface of the glass substrate 40 facing the element substrate 100 so as to face the OLED 32 of the magenta sub-pixel 21M. The red quantum dot layer 46R functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit red light. Light emitted from the quantum dot layer 46R includes unconverted blue light together with red light. The quantum dot layer 46R is formed with a thickness adjusted so that the conversion rate for emitting magenta light, which is a mixture of red light and blue light, is obtained. Therefore, for example, the quantum dot layer 46R is preferably formed thinner than the quantum dot layers 44R and 44G.

In this way, the blue OLED 32 and the magenta sub-pixel 21M having the red quantum dot layer 46R are configured. In addition, the sub-pixel 21M does not include a magenta color filter or other color filters. That is, the sub-pixel 21M emits magenta light without passing through a magenta color filter or other color filters.

Fig. 6(b) schematically shows light emission of each of the sub-pixels 21R, 21G, 21B, and 21M. In FIG. 6(b) , arrow Lr indicates red light, arrow Lg indicates green light, and arrow Lb indicates blue light, and each number of arrows indicates the amount of light. In addition, the arrangement of each component shown in Fig. 6(b) does not coincide with the arrangement of each component shown in Fig. 6(a) for convenience.

In the magenta sub-pixel 21M, first, the blue light Lb is emitted from the OLED 32 as shown in FIG. 6(b) . Then, the blue light Lb is converted into the red light Lr by the red quantum dot layer 46R and is emitted from the quantum dot layer 46R. At this time, since the quantum dot layer 46R is formed with the thickness adjusted as described above, magenta light including red light Lr and unconverted blue light Lb from the quantum dot layer 46R is magenta. this is released 7 shows the color coordinates of the magenta sub-pixel 21M. In addition, since the quantum dot layer 46R is formed thinner than the quantum dot layers 44R and 44G, for example, the loss of activity and absorption of the blue light Lb is less than that of the quantum dot layers 44R and 44G. Subsequently, magenta light including red light Lr and blue light Lb emitted from the quantum dot layer 46R is emitted from the display surface of the panel 2 without passing through the color filter.

As described above, according to the present embodiment, the pixel 20 includes a sub-pixel 21M having no color filter in addition to the sub-pixels 21R, 21G, and 21B. Since the sub-pixel 21M does not have a color filter, the luminous efficiency is higher than that of the sub-pixels 21R and 21G. As described above, according to the present embodiment, since display can be performed using the sub-pixel 21M with high luminous efficiency, display with high luminance can be realized.

For example, in the present embodiment, the green sub-pixel 21G and the magenta sub-pixel 21M emit light or the green sub-pixel 21G, the blue sub-pixel 21B, and the magenta color sub-pixel ( 21M), white display can be realized. In either case, since white display is realized using the sub-pixel 21M having no color filter, white display with high luminance can be realized.

The sub-pixel 21M as the fourth sub-pixel is a sub-pixel that has high luminous efficiency and can be frequently used for white display. For this reason, it is preferable to arrange|position in the center side rather than the edge side in the pixel 20. For example, when the sub-pixels 21R, 21G, 21B, and 21M are arranged side by side in one direction in the pixel 20, the sub-pixel 21M is the sub-pixel 21R, 21G, 21B, and 21M. It is preferable that it is arrange|positioned at the 2nd or 3rd position from one end.

As described above, according to the present embodiment, a display with high luminance can be realized in a display device using an OLED and a quantum dot layer.

<Third embodiment>

A display device according to a third embodiment of the present invention will be described with reference to FIGS. 8 and 9 . In addition, the same reference numerals are assigned to the same components as those of the display devices according to the first and second embodiments, and descriptions thereof are omitted or simplified.

The basic configuration of the display device according to the present embodiment is the same as that of the display device according to the first embodiment. The display device according to the present embodiment is different from the display device according to the first embodiment in that the pixel 20 has a yellow or white sub-pixel 21YW in place of the cyan sub-pixel 21C. .

Hereinafter, the pixel 20 in the display device according to the present embodiment will be described with reference to FIGS. 8 and 9 . 8A is a cross-sectional view showing a schematic configuration of a pixel 20 of the display device according to the present embodiment. Fig. 8(b) is a schematic diagram showing light emission of the pixel 20 of the display device according to the present embodiment. 9 is an xy chromaticity diagram illustrating color coordinates of a yellow or white sub-pixel 21YW.

As shown in Fig. 8A, the pixel 20 in the panel 2 has a yellow or white portion in addition to the red sub-pixel 21R, the green sub-pixel 21G, and the blue sub-pixel 21B. A pixel 21YW is also included.

On the surface of the glass substrate 40 facing the element substrate 100, a red quantum dot layer 46R and a green quantum dot layer 46G are formed so as to face the OLED 32 of the yellow or white subpixel 21YW. has been The red quantum dot layer 46R functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit red light. Light emitted from the quantum dot layer 46R includes unconverted blue light together with red light. The quantum dot layer 46R is formed with a thickness adjusted so that the transmitted amount of blue light becomes a predetermined transmitted amount. Therefore, for example, the quantum dot layer 46R is preferably formed thinner than the quantum dot layers 44R and 44G. In addition, the green quantum dot layer 46G functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit green light. Light emitted from the quantum dot layer 46G includes unconverted blue light together with green light. The quantum dot layer 46G is formed with a thickness adjusted so that the transmitted amount of blue light becomes a predetermined transmitted amount. Therefore, for example, the quantum dot layer 46G is preferably formed thinner than the quantum dot layers 44R and 44G.

In this way, the yellow or white sub-pixel 21YW having the blue OLED 32 , the red quantum dot layer 46R, and the green quantum dot layer 46G is configured. In addition, the sub-pixel 21YW does not have a yellow color filter or other color filters. That is, the sub-pixel 21YW emits yellow light or white light without passing through the yellow color filter or other color filters.

The sub-pixel 21YW may be configured as a yellow sub-pixel or configured as a white sub-pixel by appropriately adjusting one or both of the blue light transmission amount of the red quantum dot layer 46R and the blue light transmission amount of the green quantum dot layer 46G. You may. Hereinafter, when the sub-pixel 21YW is configured as a yellow sub-pixel, it is denoted as a sub-pixel 21Y, and when the sub-pixel 21YW is configured as a white sub-pixel, it is denoted as a sub-pixel 21W.

Fig. 8(b) schematically shows light emission of each of the sub-pixels 21R, 21G, 21B, and 21YW. In FIG. 8(b) , arrow Lr indicates red light, arrow Lg indicates green light, and arrow Lb indicates blue light, and the number of arrows indicates the amount of light. In addition, the arrangement of each component shown in Fig. 8(b) does not coincide with the arrangement of each component shown in Fig. 8(a) for convenience.

In the yellow or white sub-pixel 21YW, first, blue light Lb is emitted from the OLED 32 as shown in FIG. 8(b) . Subsequently, the blue light Lb is converted into red light Lr by the red quantum dot layer 46R, is emitted from the quantum dot layer 46R, and is converted into green light Lg by the green quantum dot layer 46G, and is converted into quantum dots It exits from the layer 46G. At this time, since the quantum dot layers 46R and 46G are formed with the thickness adjusted as described above, the red light Lr and the green light Lg and the unconverted blue light Lb from the quantum dot layers 46R and 46G are formed. ), yellow light or white light containing 9 shows the color coordinates of the yellow or white sub-pixel 21YW. In addition, since the quantum dot layers 46R and 46G are formed thinner than the quantum dot layers 44R and 44G, the loss of activity and absorption of the blue light Lb is less than that of the quantum dot layers 44R and 44G. Subsequently, the yellow light or white light including the red light Lr, the green light Lg, and the blue light Lb emitted from the quantum dot layers 46R and 46G does not pass through the color filter and is not transmitted through the panel 2 . emitted from the display surface.

As described above, according to the present embodiment, the pixel 20 includes a sub-pixel 21YW having no color filter in addition to the sub-pixels 21R, 21G, and 21B. Since the sub-pixel 21YW does not have a color filter, the luminous efficiency is higher than that of the sub-pixels 21R and 21G. As described above, according to the present embodiment, since display can be performed using the sub-pixel 21YW having high luminous efficiency, display with high luminance can be realized.

For example, in the present embodiment, the light emission of the white subpixel 21W, the light emission of the blue subpixel 21B and the white subpixel 21W, or the light emission of the blue subpixel 21B and the yellow subpixel 21Y white display can be realized. In either case, since the white display is realized using the sub-pixel 21Y or the sub-pixel 21W which does not have a color filter, white display with high luminance can be realized.

The sub-pixel 21YW as the fourth sub-pixel is a sub-pixel having high luminous efficiency and frequently used for white display. For this reason, it is preferable to arrange|position in the center side rather than the edge side in the pixel 20. For example, when the sub-pixels 21R, 21G, 21B, and 21YW are arranged side by side in one direction in the pixel 20, the sub-pixel 21YW is the sub-pixel 21R, 21G, 21B, and 21YW. It is preferable that it is arrange|positioned at the 2nd or 3rd position from one end.

As described above, according to the present embodiment, a display with high luminance can be realized in a display device using an OLED and a quantum dot layer.

<Fourth embodiment>

A display device according to a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11 . In addition, the same reference numerals are assigned to the same components as those of the display devices according to the first to third embodiments, and descriptions thereof are omitted or simplified.

The basic configuration of the display device according to the present embodiment is the same as that of the display device according to the first embodiment. The display device according to the present embodiment is the first in that the pixel 20 has a cyan sub-pixel 21Cc having a different configuration from the cyan sub-pixel 21C according to the first embodiment. It is different from the display device according to the embodiment.

Hereinafter, the pixel 20 in the display device according to the present embodiment will be described with reference to FIGS. 10 and 11 . 10A is a cross-sectional view showing a schematic configuration of a pixel 20 of the display device according to the present embodiment. Fig. 10(b) is a schematic diagram showing light emission of the pixel 20 of the display device according to the present embodiment. 11 is an xy chromaticity diagram illustrating color coordinates of a cyan sub-pixel 21Cc.

As shown in FIG. 10( a ), the pixel 20 in the panel 2 has cyan in addition to the red sub-pixel 21R, the green sub-pixel 21G, and the blue sub-pixel 21B. It also has a color sub-pixel 21Cc.

A cyan quantum dot layer 46C is formed on the surface of the glass substrate 40 facing the element substrate 100 so as to face the OLED 32 of the cyan subpixel 21Cc. . The cyan quantum dot layer 46C functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit cyan light. Light emitted from the quantum dot layer 46C includes unconverted blue light together with cyan light. The quantum dot layer 46C has a thickness adjusted so that the conversion rate for emitting cyan light is formed. Therefore, for example, the quantum dot layer 46R is preferably formed thinner than the quantum dot layers 44R and 44G.

As described above, the blue OLED 32 and the cyan subpixel 21Cc having the cyan quantum dot layer 46C are configured. In addition, the sub-pixel 21Cc does not include a cyan color filter or other color filters. That is, the sub-pixel 21Cc emits cyan color light without passing through the cyan color filter or other color filters.

Fig. 10(b) schematically shows light emission of each of the sub-pixels 21R, 21G, 21B, and 21Cc. In FIG. 10(b) , arrow Lr indicates red light, arrow Lg indicates green light, arrow Lb indicates blue light, and arrow Lc indicates cyan light, and the number of arrows indicates the amount of light. In addition, the arrangement of each component shown in Fig. 10(b) does not coincide with the arrangement of each component shown in Fig. 10(a) for convenience.

In the cyan sub-pixel 21Cc, first, the blue light Lb is emitted from the OLED 32 as shown in FIG. 10(b) . Subsequently, the blue light Lb is converted into cyan light Lc by the cyan quantum dot layer 46C and is emitted from the quantum dot layer 46C. At this time, since the quantum dot layer 46C is formed with the thickness adjusted as described above, the quantum dot layer 46C includes cyan light Lc and unconverted blue light Lb. cyan) color light is emitted. 11 shows the color coordinates of the cyan sub-pixel 21Cc. When the cyan quantum dot layer 46C is used, an outer cyan color can be displayed in the xy chromaticity diagram rather than a cyan color due to a mixture of blue and green colors. In addition, since the quantum dot layer 46C is formed thinner than the quantum dot layers 44R and 44G, for example, the loss of activity and absorption of the blue light Lb are less than that of the quantum dot layers 44R and 44G. Subsequently, the cyan light including the cyan light Lc and the blue light Lb emitted from the quantum dot layer 46C passes through the color filter from the display surface of the panel 2 . is released

As described above, according to the present embodiment, the pixel 20 includes a sub-pixel 21Cc having no color filter in addition to the sub-pixels 21R, 21G, and 21B. Since the sub-pixel 21Cc does not have a color filter, the luminous efficiency is higher than that of the sub-pixels 21R and 21G. As described above, according to the present embodiment, since display can be performed using the sub-pixel 21Cc having high luminous efficiency, display with high luminance can be realized.

For example, in the present embodiment, light emission of the red subpixel 21R and the cyan subpixel 21Cc, or the red subpixel 21R, the blue subpixel 21B, and the cyan subpixel White display can be realized by light emission of (21Cc). In either case, since white display is realized using the sub-pixel 21Cc having no color filter, white display with high luminance can be realized.

The sub-pixel 21Cc as the fourth sub-pixel has high luminous efficiency and can be frequently used for white display. For this reason, it is preferable to arrange|position in the center side rather than the edge side in the pixel 20. For example, when the sub-pixels 21R, 21G, 21B, and 21Cc are arranged side by side in one direction in the pixel 20 , the sub-pixel 21Cc is an arrangement of the sub-pixels 21R, 21G, 21B, and 21Cc. It is preferable that it is arrange|positioned at the 2nd or 3rd position from one end.

As described above, according to the present embodiment, a display with high luminance can be realized in a display device using an OLED and a quantum dot layer.

<Fifth embodiment>

A display device according to a fifth embodiment of the present invention will be described with reference to FIGS. 12 and 13 . In addition, the same reference numerals are assigned to the same components as those of the display devices according to the first to fourth embodiments, and descriptions thereof are omitted or simplified.

The basic configuration of the display device according to the present embodiment is the same as that of the display device according to the first embodiment. The display device according to the present embodiment replaces the cyan sub-pixel 21C according to the first embodiment, and has a yellow or white color different from that of the yellow or white sub-pixel 21YW according to the third embodiment. It differs from the display device according to the first embodiment in that the pixel 20 has a sub-pixel 21YWy.

Hereinafter, the pixel 20 in the display device according to the present embodiment will be described with reference to FIGS. 12 and 13 . 12A is a cross-sectional view showing a schematic configuration of a pixel 20 of the display device according to the present embodiment. Fig. 12(b) is a schematic diagram showing light emission of the pixel 20 of the display device according to the present embodiment. 13 is an xy chromaticity diagram illustrating color coordinates of a yellow or white sub-pixel 21YWy.

As shown in Fig. 12A, the pixel 20 in the panel 2 has a yellow or white portion in addition to the red sub-pixel 21R, the green sub-pixel 21G, and the blue sub-pixel 21B. A pixel 21YWy is also included.

A yellow quantum dot layer 46Y is formed on the surface of the glass substrate 40 facing the element substrate 100 so as to face the OLED 32 of the yellow or white subpixel 21YWy. The yellow quantum dot layer 46Y functions as a light conversion layer that converts the wavelength of light, and converts the wavelength of the blue light emitted from the OLED 32 to emit yellow light. Light emitted from the quantum dot layer 46Y includes unconverted blue light together with yellow light. The quantum dot layer 46Y is formed with a thickness adjusted so that the transmitted amount of blue light becomes a predetermined transmitted amount. Therefore, for example, the quantum dot layer 46Y is preferably formed thinner than the quantum dot layers 44R and 44G.

In this way, the blue OLED 32 and the yellow or white sub-pixel 21YWy having the yellow quantum dot layer 46Y are configured. In addition, the sub-pixel 21YWy does not have a yellow color filter or other color filters. That is, the sub-pixel 21YWy emits yellow light or white light without passing through the yellow color filter or other color filters.

The sub-pixel 21YWy may be configured as a yellow sub-pixel or as a white sub-pixel by appropriately adjusting the amount of blue light transmission of the yellow quantum dot layer 46Y. Hereinafter, when the sub-pixel 21YWy is configured as a yellow sub-pixel, it is denoted as a sub-pixel 21Yy, and when the sub-pixel 21YWy is configured as a white sub-pixel, it is denoted as a sub-pixel 21Wy.

Fig. 12(b) schematically shows light emission of each of the sub-pixels 21R, 21G, 21B, and 21YWy. In FIG. 12( b ), arrow Lr indicates red light, arrow Lg indicates green light, arrow Lb indicates blue light, and arrow Ly indicates yellow light, and the number of arrows indicates the amount of light. In addition, the arrangement of each component shown in Fig. 12(b) does not coincide with the arrangement of each component shown in Fig. 12(a) for convenience.

In the yellow or white sub-pixel 21YWy, first, blue light Lb is emitted from the OLED 32 as shown in FIG. 12(b) . Next, the blue light Lb is converted into yellow light Ly by the yellow quantum dot layer 46Y, and is emitted from the quantum dot layer 46Y. At this time, since the quantum dot layer 46Y is formed with the thickness adjusted as described above, yellow light or white light including yellow light Ly and unconverted blue light Lb is emitted from the quantum dot layer 46Y. is released 13 shows the color coordinates of the yellow or white sub-pixel 21YWy. In addition, since the quantum dot layer 46Y is formed thinner than the quantum dot layers 44R and 44G, the loss of activity and absorption of the blue light Lb is less than that of the quantum dot layers 44R and 44G. Subsequently, the yellow light or white light including the yellow light Ly and the blue light Lb emitted from the quantum dot layer 46Y is emitted from the display surface of the panel 2 without passing through the color filter.

As described above, according to the present embodiment, the pixel 20 includes a sub-pixel 21YWy having no color filter in addition to the sub-pixels 21R, 21G, and 21B. Since the sub-pixel 21YWy does not have a color filter, the luminous efficiency is higher than that of the sub-pixels 21R and 21G. As described above, according to the present embodiment, since display can be performed using the sub-pixel 21YWy with high luminous efficiency, display with high luminance can be realized.

For example, in the present embodiment, the light emission of the white subpixel 21Wy, the light emission of the blue subpixel 21B and the white subpixel 21Wy, or the light emission of the blue subpixel 21B and the yellow subpixel 21Yy white display can be realized. In either case, since the white display is realized using the sub-pixel 21Yy or the sub-pixel 21Wy which does not have a color filter, a white display with high luminance can be realized.

The sub-pixel 21YWy as the fourth sub-pixel is a sub-pixel having high luminous efficiency and frequently used for white display. For this reason, it is preferable to arrange|position in the center side rather than the edge side in the pixel 20. For example, when the sub-pixels 21R, 21G, 21B, and 21YWy are arranged side by side in one direction in the pixel 20, the sub-pixel 21YWy is the sub-pixel 21R, 21G, 21B, and 21YWy. It is preferable that it is arrange|positioned at the 2nd or 3rd position from one end.

As described above, according to the present embodiment, a display with high luminance can be realized in a display device using an OLED and a quantum dot layer.

<Sixth embodiment>

A display device according to a sixth embodiment of the present invention will be described with reference to FIG. 14 . 14 is a schematic diagram showing a schematic configuration of a pixel of the display device according to the present embodiment. In addition, the same reference numerals are assigned to the same components as those of the display devices according to the first to fifth embodiments, and descriptions thereof are omitted or simplified.

In the above first to fifth embodiments, the configuration in which the OLED is formed on the element substrate 100 and the color filter and the quantum dot layer are formed on the color filter substrate 200 has been described, but it is not limited thereto. The OLED, the quantum dot layer, and the color filter may be formed on a single glass substrate.

In this embodiment, the case where the pixel which contains the same four sub-pixels as 1st Embodiment is formed on a single glass substrate is demonstrated. Also, the pixel including the same four sub-pixels as in the second to fifth embodiments can be formed on a single glass substrate in the same manner as in the present embodiment.

As shown in FIG. 14 , the pixel 20 in the panel 2 has a cyan sub-pixel in addition to the red sub-pixel 21R, the green sub-pixel 21G, and the blue sub-pixel 21B. A pixel 21C is also included.

The panel 2 has a glass substrate 50 , but does not have a color filter substrate opposing the glass substrate 50 . The display device according to the present embodiment is a top emission type in which light is emitted from the element formation surface side of the glass substrate 50 . That is, in the display device according to the present embodiment, the element formation surface side of the glass substrate 50 is the display surface side.

On the element formation surface of the glass substrate 50, which is a transparent substrate, four anode electrodes 34 are formed so as to correspond to the sub-pixels 21R, 21G, 21B, and 21C. On each anode electrode 34 , a blue organic light emitting layer 36 is formed. A common cathode electrode 38 is formed on each blue organic light emitting layer 36 . As described above, in each pixel 20 , an OLED 32 is formed for each of the sub-pixels 21R, 21G, 21B, and 21C as in the first embodiment. On the cathode electrode 38, the sealing film 52 which encapsulates the OLED 32 is formed.

On the encapsulation film 52 , a red quantum dot layer 44R is formed to face the OLED 32 of the red subpixel 21R. A red color filter 42R is formed on the quantum dot layer 44R. As described above, the red sub-pixel 21R including the blue OLED 32 , the red quantum dot layer 44R and the red color filter 42R is configured.

Further, on the encapsulation film 52 , a green quantum dot layer 44G is formed to face the OLED 32 of the green subpixel 21G. A green color filter 42G is formed on the quantum dot layer 44G. As described above, the green sub-pixel 21G including the blue OLED 32 , the green quantum dot layer 44G and the green color filter 42G is configured.

In addition, on the encapsulation film 52 , a green quantum dot layer 46G is formed to face the OLED 32 of the cyan subpixel 21C. As described above, a cyan sub-pixel 21C having a blue OLED 32 and a green quantum dot layer 46G is configured. In addition, the sub-pixel 21C does not include a cyan color filter or other color filters.

On the other hand, neither a color filter nor a quantum dot layer is formed on the encapsulation film 52 so as to face the OLED 32 of the blue sub-pixel 21B. Therefore, the blue sub-pixel 21B has the blue OLED 32 , but does not have a blue color filter, other color filters, or a quantum dot layer.

On the entire surface of the glass substrate 50 on which the sub-pixels 21R, 21G, 21B, and 21C are formed, an encapsulation film 54 for encapsulating the quantum dot layers 44R, 44G, 46G and the color filters 42R, 42G is formed. there is. On the sealing film 54, the cover film 56 which consists of a transparent resin film etc. is formed.

As in the present embodiment, a pixel including four sub-pixels may be formed on a single glass substrate.

<Seventh embodiment>

A display device according to a seventh embodiment of the present invention will be described with reference to FIG. 15 . 15 is a schematic diagram showing a schematic configuration of a pixel of the display device according to the present embodiment. In addition, the same reference numerals are assigned to the same components as those of the display devices according to the first to sixth embodiments, and descriptions thereof are omitted or simplified.

In the above first to sixth embodiments, the configuration of the top light emitting system has been described, but it is not limited thereto. The display device may be a back light emission type.

In the present embodiment, a case in which the display device including the same four sub-pixels as in the first embodiment is a back light emission type will be described. Also, the display device including the same four sub-pixels as in the second to fifth embodiments can be configured in the same manner as in the present embodiment as a bottom light emission method.

As shown in FIG. 15 , the pixel 20 in the panel 2 has a cyan sub-pixel in addition to the red sub-pixel 21R, the green sub-pixel 21G, and the blue sub-pixel 21B. A pixel 21C is also included.

The panel 2 has a glass substrate 60 , but does not have a color filter substrate opposing the glass substrate 60 . The display device according to the present embodiment is a bottom light emission type in which light is emitted from the side opposite to the element formation surface of the glass substrate 60 . That is, in the display device according to the present embodiment, the surface side opposite to the element formation surface side of the glass substrate 60 is the display surface side.

A red color filter 42R and a red quantum dot layer 44R are sequentially stacked on the element formation surface of the glass substrate 60 , which is a transparent substrate, to correspond to the red sub-pixel 21R.

In addition, on the element formation surface of the glass substrate 60 , a green color filter 42G and a green quantum dot layer 44G are sequentially stacked to correspond to the green sub-pixel 21G.

In addition, on the element formation surface of the glass substrate 60, a green quantum dot layer 46G is formed so as to correspond to the cyan sub-pixel 21C. The color filter is not formed to correspond to the cyan sub-pixel 21C.

On the other hand, on the element formation surface of the glass substrate 60, neither a color filter nor a quantum dot layer is formed so as to face the blue sub-pixel 21B.

The color filters 42R, 42G and the quantum dot layers 44R, 44G, and 46G are encapsulated on the entire surface of the element formation surface of the glass substrate 60 on which the color filters 42R, 42G and the quantum dot layers 44R, 44G, and 46G are formed. An encapsulation film 62 is formed.

Four anode electrodes 34 are formed on the encapsulation film 62 to correspond to the sub-pixels 21R, 21G, 21B, and 21C. On each anode electrode 34 , a blue organic light emitting layer 36 is formed. A common cathode electrode 38 is formed on each blue organic light emitting layer 36 . As described above, in each pixel 20 , an OLED 32 is formed for each of the sub-pixels 21R, 21G, 21B, and 21C as in the first embodiment. In addition, in this embodiment, since it is a back light emission system, the anode electrode 34 can be comprised as a transparent electrode.

As described above, the red sub-pixel 21R including the blue OLED 32 , the red quantum dot layer 44R and the red color filter 42R is configured.

In addition, a green sub-pixel 21G having a blue OLED 32 , a green quantum dot layer 44G, and a green color filter 42G is configured.

In addition, a cyan sub-pixel 21C having a blue OLED 32 and a green quantum dot layer 46G is configured. In addition, the sub-pixel 21C does not include a cyan color filter or other color filters.

On the other hand, on the element formation surface of the glass substrate 60, neither a color filter nor a quantum dot layer is formed so that the OLED 32 of the blue sub-pixel 21B may be opposed. Therefore, the blue sub-pixel 21B has the blue OLED 32 , but does not have a blue color filter, other color filters, or a quantum dot layer.

An encapsulation film 64 for sealing the OLED 32 is formed on the entire surface of the glass substrate 60 on which the cathode electrode 38 is formed.

As in the present embodiment, a pixel including four sub-pixels may be configured as a back light emission method.

<Example>

Next, the evaluation results of the display device according to the present embodiment will be described with reference to Table 1. In the evaluation, for the display devices of Examples 1 to 5 and Comparative Example 1, the luminous efficiency of each sub-pixel and white display was calculated by simulation.

In Examples 1 to 5, the luminous efficiency was calculated for the display devices according to the first to fifth embodiments, respectively. On the other hand, in Comparative Example 1, the luminous efficiency was calculated for a display device having a pixel configuration having the same red, green, and blue sub-pixels as in the first to fifth embodiments, but not having a fourth sub-pixel.

Table 1 shows the results of measuring the luminous efficiency of each sub-pixel for the display devices of Examples 1 to 5 and Comparative Example 1. The luminous efficiencies of red, green, and the fourth sub-pixel include conversion efficiencies of quantum dots. In addition, the luminous efficiency of red and green includes the absorption rate of the color filter. In addition, the luminous efficiency of each of the red, green, and blue sub-pixels of Examples 1 to 5 was the same as that of Comparative Example 1, as indicated by arrows in Table 1, respectively, in terms of the configuration of each sub-pixel.

<Table 1>

From the results shown in Table 1, in any of Examples 1 to 5, it was confirmed that the luminous efficiency of the fourth sub-pixel having no color filter was high. In addition, according to Examples 1 to 5, it was confirmed that the luminous efficiency of white display was higher than that of Comparative Example 1, and white display with high luminance was realized. As a result, in Examples 1 to 5, power consumption for white display can be reduced as compared with Comparative Example 1.

<Modified embodiment>

This invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, a change is possible suitably.

For example, in the said embodiment, although the case where OLED was used as a light emitting element was demonstrated as an example, it is not limited to this. Instead of OLED, various light emitting devices can be used.

Further, in the above embodiment, the case in which the pixel 20 has four sub-pixels 21R, 21G, 21B and the fourth sub-pixel has been described as an example, but the present invention is not limited thereto. The pixel 20 may have a plurality of four or more sub-pixels.

1: Timing controller
2: panel
3: Source drive IC
4: Gate drive IC
20: pixel
21: hatchery
21R, 21G, 21B, 21C, 21M, 21YW, 21Cc, 21YWy: sub-pixel
30: glass substrate
34: anode electrode
36: blue organic light emitting layer
38: cathode electrode
40: glass substrate
42R, 42G: color filter
44R, 44G: quantum dot layer
46G, 46R, 46C, 46Y: quantum dot layer
50: glass substrate
60: glass substrate
100: device substrate
200: color filter substrate
D: diode
DL: data line
GL: gate line

Claims (17)

a pixel having a first subpixel of a first color, a second subpixel of a second color, a third subpixel of a third color, and a fourth subpixel of a fourth color;
each of the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel includes a light emitting element emitting the light of the third color;
Each of the first sub-pixel, the second sub-pixel and the fourth sub-pixel has a quantum dot layer that converts the wavelength of the light of the third color generated from the light emitting device,
The first sub-pixel has a first color filter of the first color,
the second sub-pixel has a second color filter of the second color;
The fourth sub-pixel emits light of the fourth color without passing through a color filter,
The first sub-pixel has a first quantum dot layer that converts the light of the third color into the light of the first color as the quantum dot layer,
The second subpixel has a second quantum dot layer that converts the light of the third color into the light of the second color as the quantum dot layer,
The fourth subpixel has a third quantum dot layer having a single-layer structure as the quantum dot layer, and the third quantum dot layer is thinner than the first quantum dot layer and the second quantum dot layer. .
The method of claim 1,
The third sub-pixel emits light of the third color without passing through a color filter.
3. The method according to claim 1 or 2,
The third quantum dot layer is thinner than the first color filter and the second color filter.
The method of claim 1,
and the third quantum dot layer converts the light of the third color into the light of the first color or the light of the second color.
a pixel having a first subpixel of a first color, a second subpixel of a second color, a third subpixel of a third color, and a fourth subpixel of a fourth color;
each of the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel includes a light emitting element emitting the light of the third color;
Each of the first sub-pixel, the second sub-pixel and the fourth sub-pixel has a quantum dot layer that converts the wavelength of the light of the third color generated from the light emitting device,
The first sub-pixel has a first color filter of the first color,
the second sub-pixel has a second color filter of the second color;
The fourth sub-pixel emits light of the fourth color without passing through a color filter,
The first sub-pixel has a first quantum dot layer that converts the light of the third color into the light of the first color as the quantum dot layer,
The second subpixel has a second quantum dot layer that converts the light of the third color into the light of the second color as the quantum dot layer,
The fourth sub-pixel has a third quantum dot layer as the quantum dot layer,
The third quantum dot layer includes a layer that converts light of the third color into light of the first color, and converts light of the third color into light of the second color and side-contacts the one layer Including other floors,
Each of the one layer and the other layer of the third quantum dot layer is formed to be thinner than the first quantum dot layer and the second quantum dot layer.
The method of claim 1,
The third quantum dot layer converts the light of the third color into the light of the fourth color.
6. The method of claim 5,
Each of the one layer and the other layer of the third quantum dot layer has a width smaller than that of the first quantum dot layer and the second quantum dot layer.
3. The method according to claim 1 or 2,
The display device of claim 1, wherein the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel are arranged to be parallel to each other in one direction.
9. The method of claim 8,
The fourth sub-pixel is disposed at a second or third position among the arrangement of the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel arranged to be parallel in the one direction, A display device, characterized in that there is.
3. The method according to claim 1 or 2,
The display device according to claim 1, wherein the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel are arranged in a grid shape.
3. The method according to claim 1 or 2,
the first color is red,
the second color is green;
the third color is blue,
The fourth color is a cyan color, a magenta color, a yellow color, or a white color.
3. The method according to claim 1 or 2,
The light emitting element is an organic light emitting diode.
3. The method according to claim 1 or 2,
and the third sub-pixel does not include a quantum dot layer.
3. The method according to claim 1 or 2,
a first substrate on which the light emitting element is formed;
and a second substrate disposed to face the first substrate and having the quantum dot layer, the first color filter, and the second color filter formed thereon.
3. The method according to claim 1 or 2,
and a substrate on which the light emitting element, the quantum dot layer, the first color filter, and the second color filter are formed on one surface.
16. The method of claim 15,
The display device, wherein the one surface side of the substrate is a display surface side.
16. The method of claim 15,
The display device according to claim 1, wherein a side of the substrate opposite to the side of the one surface is a side of the display surface.

Images