TW201913200A - Stacked body and display device including the same - Google Patents

Abstract

The present invention provides a laminate applicable to a color conversion means and capable of providing colors with excellent color purity, and a display device having the same. The present invention discloses a laminate, including a substrate; a wavelength conversion layer disposed on a first surface side of the substrate; and a color filter disposed on the first surface side of the substrate and having an absorption peak in a range of 400 nm to 500 nm. At least one of the wavelength conversion layer and the color filter is configured to diffuse light with a wavelength of 400 nm to 500 nm.

Description

Laminated body and display device including the laminated body

The present invention relates to a laminated body capable of wavelength conversion of light and a display device including the laminated body.

As a representative example of a display device, a liquid crystal display device or an organic electroluminescence (EL) display device is known. The display device has a plurality of pixels each of which has three primary colors, that is, red, green, and blue, and the pixels are appropriately driven to perform full-color display.

The methods for performing full-color display are roughly divided into three-color methods (separated coating method), white methods (white + color filter method), and color conversion methods. The three-color method is a method mostly used in organic EL display devices, and a light-emitting layer that provides different light emission according to pixels is provided, and light emission from the light-emitting layer is directly used for image formation. The white method is a method that can be used in either a liquid crystal display device or an organic EL display device, and is a method that uses a color filter to adjust light from a white light emitting element or a white backlight. In this way, light based on the optical characteristics of the color filter can be obtained for each pixel. In the color conversion method, light from a light source such as a blue light emitting element or a blue backlight is used as the excitation light, and green light, red light, and blue light from the light source obtained from a fluorescent material that emits green or red are used. A combination of light emission for full color display. For example, Patent Documents 1 and 2 disclose liquid crystal display devices employing a color conversion method. [Prior Art Literature]

[Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2016-58586 [Patent Literature 2] Japanese Patent Laid-Open No. 2016-212348

[Problems to be Solved by the Invention] One of the problems of one embodiment of the present invention is to provide a laminated body which can be applied to a full-color display of a color conversion method and which can extract light with excellent color purity from a monochromatic light source, and includes The display device of the laminated body. [Technical means to solve the problem]

One embodiment of the present invention is a laminated body including: a substrate; a wavelength conversion layer on the first surface side of the substrate; and a color filter located on the first surface side of the substrate, overlapping with the wavelength conversion layer, and There are absorption peaks in the range of 400 nm to 500 nm. At least one of the wavelength conversion layer and the color filter diffuses light in a wavelength range of 400 nm to 500 nm.

One embodiment of the present invention is a laminated body including a substrate including a first region, a second region, and a third region on a first surface; a first wavelength conversion layer on the first surface side, and a first Area overlap; a second wavelength conversion layer on the first surface side and a second area; a light transmitting layer on the first surface side and a third area; and a color filter in the first area and the second area The region overlaps the first wavelength conversion layer and the second wavelength conversion layer. The color filter has an absorption peak in a range of 400 nm to 500 nm. At least one of the first wavelength conversion layer, the second wavelength conversion layer, and the color filter diffuses light in a wavelength range of 400 nm to 500 nm. The first wavelength conversion layer and the second wavelength conversion layer absorb the light and emit light in different colors.

One embodiment of the present invention is a laminated body including: a substrate; a wavelength conversion layer on the first surface side of the substrate; and a color filter on the first surface side of the substrate, overlapping with the wavelength conversion layer at 400 There is an absorption peak in a range of nm to 500 nm; and a light diffusion layer is located on the first surface side of the substrate and diffuses light in a wavelength range of 400 nm to 500 nm.

One embodiment of the present invention includes a substrate including a first region, a second region, and a third region on a first surface; a first wavelength conversion layer located on the first surface side and overlapping the first region; and a second wavelength The conversion layer is located on the first surface side and overlaps the second region; the light-transmitting layer is located on the first surface side and overlaps the third region; the color filter is converted to the first wavelength in the first region and the second region The layer overlaps the second wavelength conversion layer and has an absorption peak in the range of 400 nm to 500 nm; and a light diffusion layer in the first region and the second region with the first wavelength conversion layer, the second wavelength conversion layer, and the color The filters overlap and diffuse light in a wavelength range of 400 nm to 500 nm. The first wavelength conversion layer and the second wavelength conversion layer absorb light in a wavelength range of 400 nm to 500 nm and emit light in different colors.

One embodiment of the present invention is a display device including a display substrate, a pixel on the display substrate, and a laminate on the pixel. The laminated body is a laminated body including a substrate, a wavelength conversion layer located on the first surface side of the substrate, and a color filter located on the first surface side of the substrate and having an absorption peak in a range of 400 nm to 500 nm. . At least one of the wavelength conversion layer and the color filter diffuses light in a wavelength range of 400 nm to 500 nm. The wavelength conversion layer and the color filter are arranged so as to be sandwiched between the display substrate and the substrate and overlap the pixels.

One embodiment of the present invention is a display device including a display substrate, a first pixel, a second pixel, and a third pixel on the display substrate, and a laminate on the first pixel, the second pixel, and the third pixel. . The laminated body includes a substrate having a first region, a second region, and a third region on a first surface; a first wavelength conversion layer on the first surface side and overlapping the first region; and a second wavelength conversion layer on the first surface The first surface side overlaps the second area; the light-transmitting layer is located on the first surface side and overlaps the third area; and the color filter is located on the first surface side and overlaps the first area and the second area. The color filter has an absorption peak in a range of 400 nm to 500 nm. At least one of the first wavelength conversion layer, the second wavelength conversion layer, and the color filter diffuses light in a wavelength range of 400 nm to 500 nm. The first wavelength conversion layer and the second wavelength conversion layer absorb the light and emit light in different colors. The first wavelength conversion layer, the second wavelength conversion layer, the light transmitting layer, and the color filter are arranged so as to be sandwiched between the display substrate and the substrate. The first wavelength conversion layer, the second wavelength conversion layer, and the light-transmitting layer are arranged so as to overlap the first pixel, the second pixel, and the third pixel, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings and the like. However, the present invention can be implemented in various forms without departing from the gist thereof, and is not limitedly interpreted by the description of the embodiments exemplified below.

Regarding the drawings, in order to explain more clearly, the width, thickness, shape, and the like of each part may be schematically shown compared to the actual form, but it is an example and does not limit the explanation of the present invention. In this specification and the drawings, elements having the same functions as those of the illustrated drawings may be denoted by the same reference numerals, and redundant descriptions may be omitted.

When a certain film is processed to form a plurality of films, the plurality of films may have different functions and functions. However, these multiple films are derived from films formed as the same layer in the same step, and have the same layer structure and the same material. Therefore, in this specification and the technical solution, these multiple films are defined as those existing in the same layer.

(First Embodiment) In this embodiment, a structure of a laminated body 170 and a display device 100 including the laminated body 170 as one embodiment of the present invention will be described.

[1. Overall Configuration] A plan view of the display device 100 is shown in FIG. 1. The display device 100 includes a plurality of pixels 104 on the display substrate 102, and the display area 106 is defined on the display substrate 102 by using these pixels 104. Each pixel 104 includes various display elements such as a liquid crystal element or an organic EL element, a current-driven light emitting diode (Light Emitting Diode, LED), and a micro-electromechanical systems (MEMS) shutter. The arrangement of the pixels 104 is not limited, and various arrangements such as a stripe arrangement or a triangle arrangement can be used. In the present embodiment, a mode in which a liquid crystal element is used as a display element is described.

A driving circuit for driving the pixels 104 is provided in a region (peripheral region) surrounding the display region 106. In the example shown in FIG. 1, two gate-side driving circuits 108 or source-side driving circuits 110 are provided to sandwich the display area 106. Wirings (not shown) extend from the display region 106, the gate-side driving circuit 108, and the source-side driving circuit 110 to one side of the display substrate 102 and are exposed at the ends of the display substrate 102 to form terminals 114. The terminal 114 is electrically connected to a Flexible Printed Circuit (FPC) 116. A driver integrated circuit (IC) 112 for controlling the pixels 104 may be further mounted on the FPC 116 or the display substrate 102. Furthermore, the driver IC 112 may be used to implement the above-mentioned functions without providing the source-side driving circuit 110 in the peripheral region. The display element is controlled by the gate-side driving circuit 108 or the source-side driving circuit 110 and the like, whereby an image is displayed on the display area 106.

[2. Pixel] FIG. 2 is a schematic plan view of the pixel 104. Three adjacent pixels 104 are shown in FIG. 2. For clarification, the pixel electrode 152 or the capacitor electrode 151, the counter electrode 156, or a part of them are not depicted in a part of the pixels 104.

The display device 100 includes a plurality of scanning lines 122, a plurality of signal lines 120, and a plurality of capacitor lines 124 electrically connected to the plurality of pixels 104. The scanning line 122 and the capacitor line 124 are connected to the gate-side driving circuit 108 shown in FIG. 1, and the signal line 120 is connected to the source-side driving circuit 110 and / or the driver IC 112. Each scan line 122 and the capacitor line 124 are connected to a plurality of pixels 104 arranged in a direction in which the scan line 122 and the capacitor line 124 extend. Each signal line 120 is connected to a plurality of pixels 104 arranged in a direction in which the signal line 120 extends.

Each pixel 104 includes at least one transistor 130 and a capacitor 150 in addition to the liquid crystal element. The transistor 130 includes a semiconductor film 134, a gate electrode 132 as a part of the scanning line 122 (the portion protruding downward on the figure), and a source / sink as a part of the signal line 120 (the portion protruding on the right side in the figure). An electrode 136, a source / drain electrode 138, and the like. In this specification and the technical solution, the source electrode and the drain electrode are sometimes replaced with each other according to the direction of the current or the polarity of the transistor. Therefore, these are not specifically distinguished and both are referred to as source / drain electrodes.

A part of the source / drain electrode 138 also functions as one electrode (capacitive electrode) 151 of the capacitor 150. The capacitor 150 is formed by the capacitor electrode 151 and the capacitor line 124 and a gate insulating film (described later) 142 provided therebetween. The capacitor 150 has a function of holding a potential applied from the signal line 120 to the pixel electrode 152 through the transistor 130 for a predetermined time.

FIG. 3 is a schematic cross-sectional view taken along a chain line AA ′ in FIG. 2. A backlight unit 190 is provided below the display substrate 102, and blue light is supplied from the backlight unit 190 to the liquid crystal layer 160 side through the display substrate 102. Here, the so-called blue light is light having a light emission peak in a region of 400 nm to 500 nm, 435 nm to 500 nm, or 435 nm to 480 nm, and the emission spectrum thereof can also deviate from the wavelength range (hereinafter, blue Color wavelength range). In addition, there may be a plurality of emission peaks in the wavelength range. Although the details are omitted, the backlight unit 190 includes an LED or a light guide plate that emits blue light. The material of the active layer of the LED is not limited, and for example, blue light emission can be obtained by using a compound semiconductor such as InGaN.

A polarizing plate 126 is provided between the backlight unit 190 and the display substrate 102. In the configuration shown in FIG. 3, the polarizing plate 126 is provided so as to be in contact with the backlight unit 190 or the display substrate 102, but other layers or members may be interposed therebetween.

As shown in FIG. 3, the transistor 130 is provided on the display substrate 102 via a base film 140 having an arbitrary configuration. A gate insulating film 142 is provided on the gate electrode 132, and a semiconductor film 134, a source / drain electrode 136, and a source / drain electrode 138 are provided on the gate insulating film 142. The transistor 130 shown in FIG. 3 is a bottom-gate transistor, but the structure of the transistor 130 is not limited. The transistor 130 may be a top-gate transistor, or may have gates above and below the semiconductor film 134. Structure of the electrode. In addition, the vertical relationship between the semiconductor film 134 and the source / drain electrode 138 and the source / drain electrode 136 is not restricted.

The capacitor 150 may be disposed on the base film 140 and includes a part of the capacitor line 124, the gate insulating film 142, and the capacitor electrode 151. The display device 100 further includes an interlayer insulating film 144. The interlayer insulating film 144 is provided so as to cover the transistor 130 or the capacitor 150, and can be formed in a thickness that imparts a flat surface by absorbing the unevenness caused by them. The pixel electrode 152 is disposed on the interlayer insulating film 144. The pixel electrode 152 is electrically connected to the source / drain electrode 138 in a contact hole 146 formed on the interlayer insulating film 144.

The pixel 104 further includes a first alignment film 148 covering the pixel electrode 152. The first alignment film 148 is an insulating film having a function of aligning liquid crystal molecules in the liquid crystal layer 160 in a certain direction, and determines the initial alignment state of the liquid crystal molecules (when no potential difference is provided between the pixel electrode 152 and the counter electrode 156). A second alignment film 154, a counter electrode 156, and a polarizing plate 128 are provided on the first alignment film 148 via the liquid crystal layer 160. The light from the backlight unit 190 that has passed through the polarizing plate 126 is rotated by the liquid crystal layer 160 with its polarization plane, and exits through the polarizing plate 128. The rotation of the polarization plane is determined by the alignment of liquid crystal molecules in the liquid crystal layer. A potential difference is applied between the pixel electrode 152 and the counter electrode 156 based on an image signal supplied from the signal line 120, and the alignment state of the liquid crystal molecules changes from an initial alignment state to an alignment state determined by an electric field. Along with the change of the alignment state, the light transmittance of the liquid crystal element changes, and coordinated display is realized.

[3. Laminated Body] A laminated body 170 that performs wavelength conversion of light extracted from the backlight unit 190 through the liquid crystal layer 160 is formed on the pixel 104. The laminated body 170 includes a wavelength conversion layer 172 and a color filter 174, and may further include a light-transmitting layer 176 described later. The substrate 118 may be identified as one of the configurations of the laminated body 170, and the following description will be made based on the identification.

In the laminated body 170, the substrate 118, the wavelength conversion layer 172, and the color filter 174 overlap each other. That is, a wavelength conversion layer 172 and a color filter 174 are provided on one side of the main surface of the substrate 118 (a surface facing the counter electrode 156. Hereinafter, also referred to as a first surface). The wavelength conversion layer 172 and the color filter 174 are disposed between the substrate 118 and the display substrate 102.

Furthermore, the display device 100 may include, for example, a light-shielding film (black matrix) 164 overlapping the transistor 130 or the signal line 120 and the scanning line 122, or a protective film covering the light-shielding film 164 or the wavelength conversion layer 172 and the color filter 174. (Hereinafter, a protective layer) 162 is an arbitrary structure. An adhesive layer (not shown) is provided between the protective layer 162 and the polarizing plate 128, and the polarizing plate 128 and the laminated body 170 can be fixed by using the adhesive layer. The protective layer 162 may include a silicon-containing inorganic compound such as silicon nitride or silicon oxide, or a polymer material such as polyolefin or polycarbonate, polyester, epoxy resin, and acrylic resin. Although not shown, a substrate (glass substrate or plastic) that transmits visible light may be further provided between the polarizer 128 and the protective layer 162 (if the protective layer 162 is not provided, between the polarizer 128 and the laminated body 170). Substrate, etc.).

The detailed structure of the laminated body 170 is shown in FIG. 4. FIG. 4 is a schematic cross-sectional view taken along the dashed line BB ′ in FIG. 2, and illustrates a stacked body 170 provided on three adjacent pixels 104. In consideration of intelligibility, the structure below the counter electrode 156 is omitted here. Here, a pixel that takes out the light with the shortest wavelength, that is, blue light is set to 104b, a pixel that takes out the light with the longest wavelength (that is, red light) is set to 104r, and a pixel that takes out green light is set to 104g. . Here, green light refers to light that shows a peak of a spectrum in a wavelength range (hereinafter, a green wavelength range) of 500 nm to 600 nm, 500 nm to 580 nm, or 500 nm to 560 nm. On the other hand, the term "red light emission" refers to light having a peak in a spectrum in a wavelength range (hereinafter, a red wavelength range) of 600 nm to 800 nm, 600 nm to 750 nm, or 610 nm to 750 nm. The spectrum of each light may exist outside the above-mentioned wavelength range, and may have a plurality of peaks within these wavelength ranges.

In the pixel 104r, the laminated body 170 includes a wavelength conversion layer 172r and a color filter 174 that overlap each other. Similarly, in the pixel 104g, the laminated body 170 has a wavelength conversion layer 172g and a color filter 174 which overlap each other. On the other hand, the pixel 104b is not provided with the wavelength conversion layer 172g, the wavelength conversion layer 172r, and the color filter 174, and a light transmitting layer 176 is formed. Hereinafter, the wavelength conversion layer 172g and the wavelength conversion layer 172r will be referred to as a wavelength conversion layer 172 without any particular difference between them. The wavelength conversion layer 172g and the wavelength conversion layer 172r may be referred to as a first wavelength conversion layer and a second wavelength conversion layer, respectively.

3-1. Wavelength conversion layer The wavelength conversion layer 172g and the wavelength conversion layer 172r are films having functions of absorbing light from the backlight unit 190, that is, blue light, and giving green and red light emission, respectively. That is, it is a film which displays photoluminescence using blue light as excitation light. Thereby, green and red light can be obtained from the pixel 104g and the pixel 104r, respectively.

The wavelength conversion layer 172g and the wavelength conversion layer 172r having the functions described above include a pigment (hereinafter, a fluorescent material) that displays fluorescence and a matrix for dispersing the fluorescent material. The fluorescent material may be a dye or a pigment. Examples of the fluorescent material include organic compounds such as coumarin-based pigments, quinacridone-based pigments, anthracene-based pigments, fluorene-based pigments, pyran-based pigments, and quinolinol complex-based pigments, including gallium or selenium , Zinc, indium, cadmium and other compound semiconductors. When a compound semiconductor is used, a quantum dot whose size is controlled to several tens to tens of nm can be used. In this case, the emission color can be adjusted by controlling the size of the particles. Examples of the quantum dot include a compound of a metal such as zinc, cadmium, lead, and a group 16 element such as sulfur, selenium, and tellurium, and CdSe and ZnS are exemplified. Alternatively, a compound of a group 13 element such as indium or gallium and a group 15 element such as phosphorus or arsenic may be mentioned, and InP, GaAs, and the like are exemplified.

As the matrix, a polymer material that has a small absorption of visible light or does not have an absorption peak in the visible light region can be used. Examples include polymer materials such as polymethacrylate, polyacrylate, aromatic polycarbonate, polyolefin, and polystyrene. Alternatively, a photocurable resin such as an epoxy resin or an acrylic resin, or a thermosetting resin may be used. The wavelength conversion layer 172 can be formed by applying a mixed solution containing these matrices and a fluorescent material by an inkjet method or a printing method, and thereafter drying or curing.

The wavelength conversion layer 172 may further include an antioxidant to prevent oxidation of the fluorescent material. As the antioxidant, for example, a phosphorus-based antioxidant having a basic skeleton such as a trialkyl phosphite, an alkylallyl phosphite, and a triallyl phosphite can be used. A phenol-based antioxidant having a phenol skeleton with a large substituent such as a third butyl group, a sulfur-based antioxidant having a thioether group, and the like. Thereby, the lifetime of the fluorescent material dispersed in the wavelength conversion layer 172 can be improved, and deterioration of the wavelength conversion layer 172 can be prevented or suppressed.

3-2. Color Filter The color filter 174 is a film having a function of absorbing light from the backlight unit 190 which is not absorbed by the wavelength conversion layer 172g and the wavelength conversion layer 172r and transmitted. Therefore, the color filter 174 selectively absorbs blue light provided by the backlight unit 190. In other words, the color filter 174 is a film having characteristics such that it has absorption peaks in the blue wavelength region, does not show absorption in other wavelength regions, or has less absorption in other wavelength regions than in the blue wavelength region. Therefore, for example, yellow light (for example, light having a spectral peak in the range of 550 nm to 600 nm) is easily transmitted. The color filter 174 contains a pigment having the above-mentioned optical characteristics. The pigment may be any of a dye and a pigment. For example, the pigment may be selected from the Color Index (CI) Pigment Yellow 150, CI Pigment Yellow 213, CI Pigment Yellow 215, CI Pigment Yellow 185, CI Pigment Yellow 138, One or more of CI Pigment Yellow 139, CI Solvent Yellow 21, CI Solvent Yellow 82, CI Solvent Yellow 83: 1, CI Solvent Yellow 33, CI Solvent Yellow 162 and the like are selected.

Similarly to the wavelength conversion layer 172, the color filter 174 can be formed by using a mixed solution (suspension) containing a matrix and a pigment, and applying an inkjet method or a printing method.

3-3. Light-transmitting layer The light-transmitting layer 176 includes a material that does not have absorption or does not show absorption peaks in the blue region, and has a function of efficiently transmitting light from the backlight unit 190. Specifically, the polymer material may be included. With this configuration, blue light can be obtained from the pixel 104b.

In the example shown in FIG. 4, the substrate 118 is in contact with the color filter 174, the light-shielding film 164, and the light-transmitting layer 176. Although not shown, an insulating film may be provided between the substrate 118 and the color filter 174, between the substrate 118 and the light-shielding film 164, and between the substrate 118 and the light-transmitting layer 176. The insulating film may include, for example, a silicon-containing inorganic compound such as silicon oxide or silicon nitride, and may have a single-layer structure or a stacked structure. By providing the insulating film, the diffusion of impurities contained in the substrate 118 can be prevented.

3-4. Light Diffusion In the multilayer body 170 of the present embodiment, at least one of the color filter 174 and the wavelength conversion layer 172 diffuses light in at least a blue wavelength region of the light from the backlight unit 190. Make up.

For example, at least one of the color filter 174 and the wavelength conversion layer 172 is configured to include the light diffusion particles 180. The light diffusion particles 180 may include an inorganic compound or an organic compound. Examples of the inorganic compound include metal oxides, sulfides, sulfates, halides, nitrides, and silicates. Examples include calcium carbonate, barium sulfate, titanium dioxide, silicon dioxide (silicon dioxide rubber), and zirconia. , Aluminum silicate, etc. Examples of the organic compound include polymers having a basic skeleton of polymethacrylate, polyacrylate, polycarbonate, polystyrene, polyolefin, or polynorbornene. These polymers can be crosslinked between molecules. Alternatively, a polymer in which a halogen such as fluorine, chlorine, or bromine is introduced into a main chain or a side chain may be used. Examples of the fluorine-introduced polymer include fluorine-containing polyolefins such as polytetrafluoroethylene. When a polymer is used, the light diffusion particle 180 may have a three-dimensional structure with a hollow structure. That is, the light-diffusion particle 180 which has a core-shell structure and whose shell part consists of a polymer, and whose core part contains air can also be used.

Alternatively, at least one of the color filter 174 and the wavelength conversion layer 172 has a plurality of fine holes 182, and light diffusion can be achieved by using the difference between the refractive index of the air contained in the fine holes 182 and the matrix.

The shape of the light diffusion particles 180 or the pores 182 is not limited. The average particle diameter of the light diffusion particles 180 or the average diameter of the pores 182 may be set to 100 nm to 500 μm, 1 μm to 300 μm, or 10 μm to 100 μm. When the light-diffusing particles 180 are included in the wavelength conversion layer 172, when the total amount of the wavelength-converting layer 172 is 100% by weight, the concentration of the light-diffusing particles needs to be 5 to 20% by weight, Alternatively, it may be 5% by weight or more and 10% by weight or less. The color filter 174 or the wavelength conversion layer 172 containing the light diffusing particles 180 can be formed by adding light diffusing particles 180 to a mixed solution of a matrix and a pigment or a fluorescent material, and using an inkjet method or a printing method. The mixed solution is applied, followed by drying or hardening.

On the other hand, it is not necessary to provide a light diffusion function to the light transmitting layer 176. Therefore, the addition of the light diffusion particles 180 or the formation of the pores 182 need not be performed in the light-transmitting layer 176, as long as one or both of the color filter 174 and the wavelength conversion layer 172 are selectively performed.

It is known that in a display device employing a light conversion method, by laminating a wavelength conversion layer and a color filter, the color filter can absorb light to a certain extent that passes through the wavelength conversion layer without performing wavelength conversion. Thereby, color mixing caused by light with a short wavelength can be suppressed to a certain extent in a pixel that is provided with light with a longer wavelength (for example, a pixel that is provided with green or red).

However, if it is only a color filter, it is difficult to completely absorb light without wavelength conversion. Therefore, it is necessary to use a color filter with a very large thickness or to increase the pigment content rate of the color filter significantly. According to estimates by the inventors, in order to completely absorb light from the backlight unit that is not wavelength-converted by the wavelength conversion layer, a pigment content rate of 90% by weight or more is required in the case of a thin-film color filter of 1 μm or less. . In fact, a color filter having such a high pigment content rate cannot actually exist and be produced stably as an independent film.

On the other hand, the inventors have discovered that by constituting the wavelength conversion layer 172 or the color filter 174 so as to diffuse light in the blue wavelength region, the light conversion efficiency (ie, the appearance As a result, the light emission quantum efficiency is improved. As a result, the intensity of the light transmitted through the wavelength conversion layer 172 is reduced without performing wavelength conversion, and it is possible to effectively suppress the color mixing of light extracted from the pixels 104g and 104r. Therefore, by using the laminated body 170, blue, green, and red having high color purity can be obtained from the pixels 104b, 104g, and 104r, respectively, and a display device having a wide color gamut can be provided. Furthermore, the thickness of the color filter 174 can be reduced, or the pigment content rate of the color filter 174 can be reduced. As a result, it is possible to further reduce the thickness of the display device or reduce the manufacturing cost.

<Second Embodiment> The structure of the laminated body 101 is not limited to the structure shown in the first embodiment, and can be changed to various structures. For example, in the multilayer body 170 of the first embodiment, the wavelength conversion layers 172 are spaced apart from each other on the light shielding film 164 without contacting each other (FIG. 4). As shown in FIG. The transformation layers 172 may be in contact with and overlap each other. In the example shown in FIG. 5 (A), the wavelength conversion layer 172g and the wavelength conversion layer 172r are in contact with and overlap each other.

In the multilayer body 170 of the first embodiment, the color filters 174 are continuously formed and integrated between adjacent pixels 104 (FIG. 4). That is, one color filter 174 is shared by two adjacent pixels 104g and 104r. However, as shown in FIG. 5 (B), the color filters 174 may be spaced apart from each other between adjacent pixels 104. In this case, the light shielding film 164 may be in contact with the protective layer 162 or the wavelength conversion layer 172.

Alternatively, as shown in FIG. 6, a protective layer 162 is not provided, and a light transmitting layer 176 is provided on the pixel 104 g and the pixel 104 r so that not only the pixel 104 b but also the pixel 104 g or the pixel 104 r overlaps the wavelength conversion layer 172. In this case, the light-transmitting layer 176 may also function as an adhesive layer that bonds the laminated body 170 and the polarizing plate 128.

Even with such a configuration, the same effects as those of the laminated body 170 of the first embodiment can be achieved. Therefore, by applying the laminated body 170 of the present embodiment, not only a wide color gamut can be provided to a display device, but also a reduction in thickness of the display device or reduction in manufacturing costs can be achieved.

<Third Embodiment> In this embodiment, a laminated body 184 having a structure different from that of the laminated body 170 described in the first embodiment will be described. Regarding the similar or similar configuration to the first and second embodiments, the description may be omitted.

The laminated body 184 is different from the laminated body 170 in that the light-converting layer 180 is not added to the wavelength conversion layer 172 or the color filter 174, or the pores 182 are not formed, and the light-diffusing layer 178 is included.

More specifically, as shown in FIG. 7, the laminated body 184 includes a wavelength conversion layer 172, a color filter 174, and a light diffusion layer 178 that overlap each other. These are arranged on the first surface side of the substrate 118. Like the laminated body 170, the laminated body 184 may include a light transmitting layer 176. In the example shown in FIG. 7, the light transmitting layer 176 overlaps the pixel 104 b, the wavelength conversion layer 172 g and the wavelength conversion layer 172 r overlap the pixel 104 g and the pixel 104 r, respectively, and the color filter 174 and the light diffusion layer 178 overlap the pixel 104 g and the pixel 104r both overlap. The wavelength conversion layer 172 is located between the color filter 174 and the light diffusion layer 178, and the color filter 174 is located between the substrate 118 and the wavelength conversion layer 172.

As described above, the color filter 174, the wavelength conversion layer 172g, and the wavelength conversion layer 172r are not added with the light diffusion particles 180 or the pores 182 are not formed. In contrast, the light diffusion layer 178 includes a matrix and includes light diffusion particles 180 or fine holes 182. These matrices, light diffusing particles 180, and pores 182 are the same as those in the first embodiment.

In the laminated body 184, light from the backlight unit 190 is diffused in the light diffusion layer 178, and as a result, the external light conversion efficiency in the wavelength conversion layer 172 is improved. Therefore, the intensity of the light transmitted through the wavelength conversion layer 172 is reduced without performing wavelength conversion, and the transmitted light is efficiently absorbed by the color filter 174. Therefore, blue, green, and red having high color purity can be obtained from the pixels 104b, 104g, and 104r, respectively, and a display device having a wide color gamut can be provided. Furthermore, the thickness of the color filter 174 can be reduced, and the pigment content rate of the color filter 174 can be reduced, which contributes to further reduction in thickness of the display device or reduction in manufacturing costs.

<Fourth Embodiment> In the display device 100 which is one of the embodiments of the present invention, a pixel 105 having a structure different from that of the pixel 104 shown in the first embodiment may be used. The mode will be described below. Regarding configurations similar to those described in the first to third embodiments, or the same configuration, the description may be omitted.

A schematic plan view of the pixel 105 is shown in FIG. 8, and a schematic cross-sectional view taken along the chain line CC ′ of FIG. 8 is shown in FIG. 9. As shown in these figures, one of the different aspects of the pixel 105 from the pixel 104 is that the pixel electrode 152 has a comb-like shape and the pixel electrode 152 is formed on the counter electrode 156 via the insulating film 145. The pixel electrode 152 has a slit 153. The slit 153 may be a closed shape or an open shape. In the example shown in FIG. 8, both the closed-shaped slit 153 and the open-shaped slit 153 are included in the pixel electrode 152. The pixel electrode 152 is electrically connected to the transistor 130 through an interlayer insulating film 144 provided on the transistor 130 and a contact hole 146 provided on the planarization film 158.

The opposite electrodes 156 are arranged in a stripe shape in a direction in which the scanning line 122 extends, and are shared by the plurality of pixels 105. However, the counter electrode 156 may be arranged perpendicular to the scanning line 122, that is, parallel to the signal line 120. In the pixel 105 having the structure, an electric field is generated in the liquid crystal layer 160 in a direction substantially parallel to the upper surface of the display substrate 102, and is driven in an in-plane switching (IPS) mode by the electric field Display device 100.

Similarly to the display device 100 of the first embodiment, a laminated body 170 or a laminated body 184 may be provided on the pixel 105 having the above-mentioned structure. Therefore, by applying this embodiment mode, it is possible to provide an IPS-type liquid crystal display device having a wide color gamut and further thinning at a low cost.

<Fifth Embodiment> In this embodiment, an organic EL display device as one of the embodiments of the present invention will be described. Regarding configurations similar to those described in the first to fourth embodiments, or the same configuration, descriptions may be omitted.

The organic EL display device includes a plurality of pixels 104 or a gate-side driving circuit 108, a source-side driving circuit 110, a driver IC 112, and the like on a display substrate 102 similarly to the display device 100 shown in FIG. 1. Each of the plurality of pixels 104 includes an organic EL element.

A schematic plan view of three adjacent pixels 104 is shown in FIG. 10, and a schematic cross-sectional view taken along the chain line DD ′ in FIG. 10 is shown in FIG. 11. For clarification, the counter electrode 244 or the pixel electrode 240, the capacitor electrode 220, or a part thereof is not depicted in a part of the pixel 104. As shown in these figures, the organic EL display device includes a plurality of scan lines 202, a plurality of signal lines 200, and a plurality of current supply lines 204 electrically connected to the plurality of pixels 104. The scanning line 202 is connected to the gate-side driving circuit 108, and the signal line 200 is connected to the source-side driving circuit 110 and / or the driver IC 112. Each scan line 202 is connected to a plurality of pixels 104 arranged in a direction in which the scan line 202 extends, and each signal line 200 and a current supply line 204 are connected to a plurality of pixels 104 arranged in a direction in which these lines extend.

Each pixel 104 includes at least a switching transistor 210, a driving transistor 230, and a capacitor 250. The switching transistor 210 includes a gate electrode 214 as a part of the scanning line 202 (a portion protruding downward on the figure), and a source / drain electrode 216 as a part of the signal line 200 (a protruding portion on the right side in the figure). , Semiconductor film 212, source / drain electrode 218, and the like. The source / drain electrode 218 is connected to the capacitor electrode 220 existing on the same layer as the scan line 202 via the contact hole 224. The driving transistor 230 includes a gate electrode 234 as a part of the capacitor electrode 220 (a portion protruding downward in the figure), and a source / drain electrode 236 as a part of the current supply line 204 (a portion protruding toward the left in the figure). , A part of the semiconductor film 232, a source / drain electrode 238, and the like. A capacitor 250 is formed by using another part of the semiconductor film 232, a gate insulating film 252, and a capacitor electrode 220 described later, which contributes to the holding of the gate electrode of the driving transistor 230.

As shown in FIG. 11, a switching transistor 210 or a capacitor 250 represented by a driving transistor 230 is provided on the display substrate 102 via a base film 248 having an arbitrary configuration. A semiconductor film 232 is disposed on the base film 248. A channel formation region 232 a overlapping the gate electrode 234 and a doped region 232 b sandwiching the channel formation region 232 a are formed on the semiconductor film 232. The doped region 232 b facing the capacitor electrode 220 functions as one electrode of the capacitor 250.

An opening for exposing the source / drain electrode 238 is provided on the planarizing film 256 that covers the driving transistor 230 or the capacitor 250 and provides a flat surface, and the driving of the transistor 230 and the pixel electrode 240 on the planarizing film 256 is performed. Sexual connection. The pixel electrode 240 is configured to reflect visible light, and is formed to include, for example, a metal having a high reflectance such as aluminum or silver. Alternatively, a film of a conductive oxide that transmits visible light, such as indium tin oxide (ITO) or indium zinc oxide (IZO), may be provided on the metal. Thereby, it is possible to reduce the barrier to the hole injection into the electric field light emitting layer (hereinafter, the EL layer) 242 described below.

An end portion of the pixel electrode 240 is covered by a partition wall 258, and an EL layer 242 is formed on the pixel electrode 240 and the partition wall 258. The EL layer 242 may have any configuration. For example, a functional layer having various functions such as a charge injection layer, a charge transport layer, a light emitting layer, a charge block layer, and an exciton block layer may be appropriately combined to form the EL layer 242. In FIG. 11, as a representative functional layer, a hole injection / transport layer 242a, a light-emitting layer 242b, and an electron injection / transport layer 242c are depicted. In the EL display device of this embodiment, the EL layer 242 is configured so that blue light emission can be obtained in all the pixels 104. Therefore, the structure of the EL layer 242 may be the same among the pixels 104.

The light-emitting layer 242b that imparts blue light emission may be formed of a single compound or may have a so-called guest-guest structure. In the case of the host-guest type, as the host material, for example, nitrogen-containing aromatic compounds such as condensed aromatic compounds such as stilbene derivatives and anthracene derivatives, oxazole derivatives, aromatic amines, and phenanthroline derivatives can be used. Wait. The guest functions as a light-emitting material in the host-guest light-emitting layer 242b, and is selected from a fluorescent material or a phosphorescent material that imparts a light-emitting peak in a blue light-emitting region. Examples of the fluorescent material include compounds having a short conjugate length such as a coumarin derivative, a pyran derivative, a quinacridone derivative, a fluorene derivative, and an anthracene derivative. As the phosphorescent pigment, an iridium-based orthometal complex and the like can be used. In the case where the light emitting layer 242b is constituted by a single compound, the host material may be used. In this case, the host material functions as a light-emitting material.

A counter electrode 244 is provided on the EL layer 242. The counter electrode 244 is configured to transmit at least a part of visible light. Specifically, as the counter electrode 244, a layer including a conductive oxide that transmits visible light, such as ITO or IZO, a film formed of a thickness that transmits visible light, and a metal having a small work function such as magnesium, or a laminate thereof is used as the counter electrode 244. Be exploited. An organic EL element is constructed using the pixel electrode 240, the EL layer 242, and the counter electrode 244.

As an arbitrary configuration, a protective film 260 for protecting the organic EL element may be provided. The protective film 260 preferably has a low transmittance of water or oxygen, and includes silicon nitride, for example.

A stacked body 170 or a stacked body 184 is provided on each pixel 104. The light-transmitting layer 176 (see FIG. 6) of the laminated body 170 and the laminated body 184 overlaps with the pixel 104 b that obtains blue light emission, and the wavelength conversion layer 172 g and the color filter 174 overlap with the 104 g of green-light-emitting pixels. The laminated body 170 and the laminated body 184 are arranged so that the red light emitting pixels 104r are overlapped with 172r and the color filter 174. In the pixel 104b, light generated in the EL layer 242 passes through the light-transmitting layer 176 and blue light is observed. On the other hand, in the pixels 104g and 104r, the light generated in the EL layer 242 is converted into green light and red light by the wavelength conversion layer 172g and the wavelength conversion layer 172r, and passes through the wavelength conversion layer without wavelength conversion. The blue light of 172 is absorbed by the color filter 174. Therefore, blue, green, and red having high color purity can be obtained from the pixels 104b, 104g, and 104r, respectively, and a display device having a wide color gamut can be provided. Furthermore, the thickness of the color filter 174 can be reduced, and the pigment content rate of the color filter 174 can be reduced. As a result, it is possible to further reduce the thickness of the display device or reduce the manufacturing cost.

[Examples] In this example, the results of evaluating the optical characteristics of the wavelength conversion layer 172 having the structure described in the embodiment will be described.

[1. Synthesis of Fluorescent Materials] 1-1. Preparation of In (OLA) ₃ Solution In a three-necked flask equipped with a connecting tube facing a vacuum line and a nitrogen line, a thermocouple thermometer, and a septum, indium acetate (In (In ( OAc) ₃ ) 0.57 g, Oleic Acid (OLA) 1.66 g, and Octadecene (ODE) 7.52 g. While the inside of the flask was decompressed using an oil rotary vacuum pump, the resulting mixture was heated at 260 ° C. for 1 hour, and the resulting acetic acid, water, and oxygen were removed from the mixture. Thereby, an In (OLA) ₃ solution (solution A) was obtained.

1-2. Preparation of P (SiMe ₃ ) ₃ · octadecene solution In a glove box, 0.25 g of tris (trimethylsilyl) phosphine (P (SiMe ₃ ) ₃ ) and 0.98 g of ODE were mixed, and the obtained The P (SiMe ₃ ) ₃ · DED solution (solution B) was sealed in a pressure-resistant glass bottle (vial).

1-3. Synthesis of InP core In the flask, the solution A was heated to 300 ° C, and then a cannular tube was used to sequentially add to the solution A a 20% by weight ODE solution of zinc myristate prepared and degassed, and Solution B. Thereafter, the reaction was carried out at a reaction temperature of 270 ° C. for 2 hours, and the mixture was cooled to room temperature. In addition, Solution A, Solution B, and Zinc Myristate were used so that In (OLA) ₃ , P (SiMe ₃ ) _3, and zinc myristate as ligands became 2 mmol, 1 mmol, and 3 mmol, respectively.

The flask containing the obtained reaction solution was transferred to a glove box, and the reaction solution was transferred to a beaker. After putting 8 g of toluene in a beaker containing the reaction solution, 100 g of n-butanol was added to settle the particles. Thereafter, centrifugal separation was performed and the particles were sedimented and separated. The supernatant solvent was removed from the settled particles, and the particles were dispersed again in 20 g of toluene. The same operation was repeated 5 times. Thereafter, 100 g of n-butanol was added to the redispersion solution to settle the particles again. After removing the supernatant by decantation, the obtained particles were vacuum-dried (50 ° C, 1.0 Torr, 1 hour). 10 g of hexane was added to the dried particles, and re-dispersed to obtain a hexane dispersion of an InP core.

1-4. Synthesis of ZnS shell From the obtained core dispersion, the core dispersion containing 100 mg of InP core was taken out into a flask, mixed with a 3.75 mmol / ODE 5 g solution of Zn (OLA) ₂ and then After heating under vacuum at 60 ° C for 1 hour, hexane was removed. After making the inside of the flask nitrogen, the solution was heated to 200 ° C. and maintained at the same temperature for 30 minutes.

Thereafter, the reaction solution was heated to 210 ° C., and a solution of 5.75 mmol / ODE of dodecanethiol was added dropwise over 30 minutes, and then maintained at the same temperature for 1.5 hours. Furthermore, after adding a Zn (OLA) ₃ / ODE solution, dodecanethiol was added to the mixed solution using a syringe pump to synthesize quantum dots as fluorescent materials. Furthermore, in this synthesis, a ZnS shell is formed by the reaction of Zn (OLA) ₂ and dodecanethiol. The dodecanethiol added last was attached to the outer surface of the ZnS shell as a ligand (second ligand). That is, the obtained quantum dots have a core-shell type nanocrystal in which a ZnS shell is coated on an InP core, and dodecanethiol attached to the nanocrystal as a ligand.

[2. Evaluation of Fluorescent Material] The average particle diameter of the obtained quantum dots was measured using a transmission electron microscope (TEM: JEM-2010F manufactured by Japan Electronics Corporation). Specifically, the major and minor diameters of particles of 20 arbitrarily selected quantum dots were measured, and the diameter ((major diameter + minor diameter) / 2) of each particle was determined, and the average value was calculated. The average particle size of the quantum dots is 4.8 nm.

Quantum dots were evaluated by using an elemental mapping of an energy dispersive X-rayspectrometer (EDS) mounted on a TEM. As a result, it was confirmed that the number of particles containing only ZnS was less than one per 100 core-shell nanocrystals. As a result, it was confirmed that substantially all of Zn and S covered the core-shell nanocrystals including In and P.

[3. Formation of wavelength conversion layer 172] As the light diffusion particles 180, titanium oxide particles (A-190 manufactured by Sakai Chemical Co., Ltd., with an average particle diameter of 150 nm) or yttrium oxide particles (manufactured by Japan Yttrium Corporation, average particles) were used. Diameter 150 nm). As a dispersant for yttrium oxide particles, BYK-102 (manufactured by BYK-Chemie) was used, and as a dispersant for titanium oxide particles, 2-methacrylic acid succinate was used. Ethyl ester / benzyl methacrylate copolymer. As the antioxidant, a phosphorus-based antioxidant (JA-805 manufactured by Chengbei Chemical Industry Co., Ltd.) or a phenol-based antioxidant (AO-80 manufactured by ADEKA) is used. As the resin, cyclohexyl methacrylate / succinic acid mono (2-methacrylfluorenyl acrylate) copolymer was used, and as the crosslinking agent, dipentaerythritol hexaacrylate was used. The polymer of the resin and the crosslinking agent corresponds to a matrix of the wavelength conversion layer 172. As the radiation-sensitive compound, 2,4,6-trimethylbenzylidene diphenylphosphine oxide (LUCIRIN LR8953X manufactured by BASF) and an O-fluorenyl oxime compound (Eddie) ADEKA (NCI-930) is a mixture with a mass ratio of 1: 1. As a solvent when the wavelength conversion layer 172 was produced, propylene glycol monomethyl ether acetate was used.

A propylene glycol monomethyl ether acetate dispersion liquid containing a cross-linking agent, a resin, a radiation-sensitive compound, light diffusing particles 180, a dispersant, a fluorescent material, and an antioxidant was prepared, and the dispersion liquid was coated on a spinner using a spinner. After the alkali glass substrate was applied, pre-baking was performed on a hot plate at 90 ° C. for 2 minutes to form a coating film. Then, a high-pressure mercury lamp was used for radiation irradiation (exposure amount: 120 mJ / cm ² ) to form a cured film. The cured film was developed at 23 ° C. for 60 seconds using a 0.05% by weight potassium hydroxide aqueous solution. Thereby, a wavelength conversion layer 172 is formed. The conditions of the application by the spinner or the concentration of the dispersion liquid are adjusted so that the thickness of the wavelength conversion layer 172 becomes 10 nm. The composition of the main components in the dispersion is shown in Tables 1 to 3. The composition of the crosslinking agent, resin, and radiation-sensitive compound in the dispersion was 15% by weight, 15% by weight, and 3% by weight, respectively.

[4. Formation of color filter 174] CI Pigment Yellow 139 as a colorant, BYK-LPN21116 (manufactured by BYK-Chemie) as a dispersant, and methyl group as a resin were used. Acrylic acid / styrene / benzyl methacrylate / 2-hydroxyethyl methacrylate / 2-ethylhexyl methacrylate copolymer (weight average molecular weight 12,000), dipentaerythritol hexaacrylate as a crosslinking agent, as 2-benzyl-2-dimethylamino-4'-morpholinobutyrylene (IRGACURE 369 manufactured by BASF) and O-fluorenyl oxime compound ( A mixture of 1: 1 mass ratio of NCI-930 (manufactured by ADEKA) was used to prepare a dispersion liquid for forming a color filter 174 of propylene glycol monomethyl ether acetate containing the mixture. The composition of the coloring agent, the dispersant, the resin, the cross-linking agent, and the radiation-sensitive compound in the dispersion was 10.5 wt%, 3.1 wt%, 1.9 wt%, 5.1 wt%, and 0.6 wt%, respectively.

A dispersion liquid of propylene glycol monomethyl ether acetate containing a colorant, a dispersant, a resin, a cross-linking agent, and a radiation-sensitive compound was prepared, applied to the cured film by a spinner, and then performed on a hot plate at 90 ° C. Pre-bake for 2 minutes, thereby forming a coating film. Then, a high-pressure mercury lamp was used for radiation irradiation (exposure amount: 120 mJ / cm ² ) to form a laminated film of the wavelength conversion layer 172 and the color filter 174. The conditions of the application by the spinner or the concentration of the dispersion liquid are adjusted so that the thickness of the color filter 174 becomes 1 μm.

[5. Evaluation method] Measurement was performed using a full-beam measuring device manufactured by Otsuka Electronics. Specifically, a blue LED is used as a light source, and a wavelength conversion layer 172 or a laminated film of the color conversion layer 172 and a color filter 174 is arranged on the light source. The light passing through these layers or films is collected by an integrating sphere, and fluorescent Light intensity evaluation. The evaluation was performed by calculating the 450 nm and 650 nm light of each sample when the intensity at 450 nm (sample 1 in Table 1) of only the light transmitted through the alkali-free glass substrate was 100. Relative intensity (relative light receiving intensity) and compare.

[6. Effects of Light Diffusion Particles 180] In order to study the effects of the light diffusion particles 180, samples 1 to 5 were prepared. Samples 1 and 2 correspond to a control experiment. In these samples, only one of the alkali-free glass substrate or the alkali-free glass substrate, which does not contain any of the fluorescent material and the light diffusion particles 180, was used. matrix. On the other hand, Sample 3 is a sample in which a wavelength conversion layer 172 containing no light diffusion particles 180 is provided on an alkali-free glass substrate. Samples 4 and 5 are samples in which a wavelength conversion layer 172 containing yttrium oxide (Y ₂ O ₃ ) and titanium oxide (TiO ₂ ) as light diffusion particles 180 is formed, respectively.

The results of samples 1 and 2 show that the matrix itself does not absorb blue light at 450 nm, and it does not have the function of converting blue light to long-wavelength light (650 nm). From the results of Sample 3, it can be understood that by adding quantum dots as fluorescent materials, a part of the blue light is absorbed and converted into long-wavelength light. On the other hand, when yttrium oxide was used as the light diffusion particle 180 (sample 4), it was confirmed that blue light was further absorbed. When the wavelength conversion layer 172 containing titanium oxide was used (Sample 5), it was found that the relative light-receiving intensity at 450 nm significantly decreased, and the light-receiving intensity at 650 nm increased compared to the case where no light-diffusing particles 180 were present. It is more than twice as large. From the above, it can be seen that by adding the light diffusing particles 180, short-wavelength light efficiency is absorbed better, and is effectively converted into long-wavelength light. It was found that the use of titanium oxide can effectively perform wavelength conversion of short-wavelength light.

[Table 1] Table 1. Addition effect of light diffusing particles to the wavelength conversion layer a Relative intensity when the light-receiving intensity at 450 nm of sample 1 is set to 100

Table 2 summarizes the effects of the concentrations of the fluorescent material and the light diffusion particles 180. These samples 6 to 9 are samples in which a wavelength conversion layer 172 including a fluorescent material and titanium oxide having a composition shown in Table 2 was formed on an alkali-free glass. It can be seen that as a whole, as the respective concentrations of the fluorescent material and the light diffusing particles 180 increase, short-wavelength light is effectively absorbed and converted into long-wavelength light. According to the table, it can be said that the light conversion can be sufficiently promoted by adding the light diffusion particles 180 at a concentration of 5.0% to 10% by weight.

[Table 2] Table 2. Effects of the concentration of fluorescent materials and light diffusion particles a Relative intensity when the light-receiving intensity at 450 nm of sample 1 is set to 100

[7. Effect of Antioxidant] In order to study the effect of antioxidant, a wavelength conversion layer 172 containing a fluorescent material and titanium oxide as light diffusion particles 180 was formed on an alkali-free glass, and a color filter was provided thereon. Samples 10 to 12 of 174. In the sample 10, the wavelength conversion layer 172 does not contain an antioxidant, and in the sample 11 and the sample 12, the wavelength conversion layer 172 contains a phosphorus-based antioxidant and a phenol-based antioxidant, respectively. The results are shown in Table 3.

It can be understood from Table 3 that even if an antioxidant is added to the wavelength conversion layer 172, its optical characteristics are not greatly affected. That is, it was confirmed that in any of the samples 10 to 12, light with a short wavelength was efficiently converted into light with a long wavelength.

[Table 3] Table 3. Effects of antioxidants a Relative intensity when the light-receiving intensity at 450 nm of sample 1 is set to 100

However, it was confirmed that an antioxidant can suppress a significant decrease in the relative light-receiving intensity at 650 nm when these samples were heat-treated (post-baked) at 180 ° C for 20 minutes in a clean oven. That is, it can be seen that in the sample 10 shown in FIG. 12, the relative light-receiving intensity at 650 nm after the post-baking is significantly lowered to about 20% compared with that before the post-baking. The reason for this is considered to be that the quantum dots, which are fluorescent materials, lack thermal stability or chemical stability, and therefore part of them deteriorated by post-baking. On the other hand, it can be understood from the results of FIG. 12 that by adding an antioxidant, although the deterioration cannot be completely suppressed, the degree of the deterioration can be suppressed. From the above, it was confirmed that the antioxidant can reduce the deterioration rate of the fluorescent material without affecting the optical characteristics of the wavelength conversion layer 172.

In this specification, a display device including a laminated body 170 or a laminated body 184 as an embodiment of the invention has been described using a liquid crystal display device and an organic EL display device as examples. However, the display device is not limited to these, and may be used in various ways. In the display device, a laminated body 170 or a laminated body 184 is used. For example, it can be applied to various display devices such as a display device (MEMS display device) that performs coordinated control using a MEMS shutter, a surface-conduction electron-emitter display (SED), and a plasma display screen. The body 170 and the laminated body 184, and these display devices including the laminated body 170 and the laminated body 184 are also one embodiment of the present invention.

As long as the embodiments described as the embodiments of the present invention do not contradict each other, they can be implemented in appropriate combinations. Based on the embodiments, those skilled in the art can add, delete, or change design elements as appropriate, as long as the gist of the present invention is included in the scope of the present invention.

Even if it is another operation effect that is different from the operation effect obtained by each of the embodiments described above, it will be understood that those who are clarified based on the description in this specification or those skilled in the art can easily predict it. Effect.

100‧‧‧ display device

101, 170, 184‧‧‧ stacked

102‧‧‧Display Board

104, 104b, 104g, 104r, 105‧‧‧ pixels

106‧‧‧display area

108‧‧‧Gate-side driving circuit

110‧‧‧Source-side driving circuit

112‧‧‧Driver Integrated Circuit

114‧‧‧terminal

116‧‧‧FPC substrate

118‧‧‧ substrate

120, 200‧‧‧ signal line

122, 202‧‧‧scan lines

124‧‧‧Capacitor line

126, 128‧‧‧ polarizers

130‧‧‧ Transistor

132, 214, 234‧‧‧‧Gate electrode

134, 212, 232‧‧‧ semiconductor film

136, 138, 216, 218, 236, 238‧‧‧ source / drain electrodes

140, 248‧‧‧ basement membrane

142, 252‧‧‧Gate insulation film

144‧‧‧Interlayer insulation film

145‧‧‧Insulation film

146, 224‧‧‧ contact hole

148‧‧‧The first alignment film

150, 250‧‧‧ capacitors

151, 220‧‧‧ capacitor electrode

152, 240‧‧‧ pixel electrodes

153‧‧‧Slit

154‧‧‧Second alignment film

156, 244‧‧‧ Counter electrode

158, 256‧‧‧‧flattening film

160‧‧‧LCD layer

162‧‧‧protective layer

164‧‧‧Light-shielding film

172, 172g, 172r‧‧‧ wavelength conversion layer

174‧‧‧Color Filter

176‧‧‧light-transmitting layer

178‧‧‧light diffusion layer

180‧‧‧ light diffusion particles

182‧‧‧ fine holes

190‧‧‧ backlight unit

204‧‧‧Current supply line

210‧‧‧Switching transistor

230‧‧‧Drive Transistor

232a‧‧‧channel formation area

232b‧‧‧doped region

242‧‧‧EL layer

242a‧‧‧hole injection / conveying layer

242b‧‧‧Light emitting layer

242c‧‧‧electron injection / transport layer

258‧‧‧ next door

260‧‧‧protective film

A-A ’, B-B’, C-C ’, D-D’‧‧‧ hatching

FIG. 1 is a schematic plan view of a display device according to an embodiment of the present invention. 2 is a schematic plan view of a pixel of a display device according to an embodiment of the present invention. 3 is a schematic cross-sectional view of a pixel of a display device according to an embodiment of the present invention. 4 is a schematic cross-sectional view of a laminated body according to an embodiment of the present invention. 5 (A) and 5 (B) are schematic cross-sectional views of a laminate according to an embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of a laminate according to an embodiment of the present invention. FIG. 7 is a schematic cross-sectional view of a laminate according to an embodiment of the present invention. 8 is a schematic plan view of a pixel of a display device according to an embodiment of the present invention. 9 is a schematic cross-sectional view of a pixel of a display device according to an embodiment of the present invention. FIG. 10 is a schematic plan view of a pixel of a display device according to an embodiment of the present invention. 11 is a schematic cross-sectional view of a pixel of a display device according to an embodiment of the present invention. FIG. 12 shows the relative light-receiving intensity at 650 nm before and after post-baking of samples 10 to 12 of the example.

Claims (18)

A laminated body includes: a substrate; a wavelength conversion layer on the first surface side of the substrate; and a color filter on the first surface side of the substrate, overlapping with the wavelength conversion layer and at 400 There is an absorption peak in a range of nm to 500 nm, and at least one of the wavelength conversion layer and the color filter diffuses light in a wavelength range of 400 nm to 500 nm. The laminated body according to item 1 of the scope of patent application, wherein the color filter is located between the substrate and the wavelength conversion layer. The laminated body according to item 1 of the patent application scope, wherein the wavelength conversion layer or the color filter that diffuses the light contains light diffusing particles containing an inorganic compound or an organic compound, and the inorganic compound is selected The organic compound contains a polymer from among oxides, sulfides, sulfates, halides, nitrides, and silicates of the metal, and the light-diffusing particles containing the organic compound are hollow particles. The laminated body according to claim 1, wherein the wavelength conversion layer or the color filter that diffuses the light includes pores containing air. The laminated body according to item 3 of the scope of patent application, wherein the light diffusion particles are included in the wavelength conversion layer. The laminated body according to item 4 of the scope of patent application, wherein the pores are included in the wavelength conversion layer. The laminated body according to item 1 of the patent application range, wherein the wavelength conversion layer includes a fluorescent material that absorbs the light and imparts a light emission peak in a range of 500 nm to 750 nm. A display device includes: a display substrate, a pixel on the display substrate, and the laminated body according to item 1 of the scope of patent application, the wavelength conversion layer and the color filter are located on the pixel. It is arranged so as to be sandwiched between the display substrate and the substrate and overlap the pixel. A laminated body comprising: a substrate having a first region, a second region, and a third region on a first surface; a first wavelength conversion layer located on the first surface side and overlapping the first region; a second A wavelength conversion layer is located on the first surface side and overlaps the second region; a light transmitting layer is located on the first surface side and overlaps the third region; and a color filter is located on the first surface On one side, the first and second regions overlap the first wavelength conversion layer and the second wavelength conversion layer, and have absorption peaks in a range of 400 nm to 500 nm. At least one of the first wavelength conversion layer, the second wavelength conversion layer, and the color filter diffuses light in a wavelength range of 400 nm to 500 nm, and the first wavelength conversion layer and the first wavelength conversion layer The 2-wavelength conversion layer absorbs the light and emits light in colors different from each other. The laminated body according to claim 9 in which the color filter is located between the substrate and the first wavelength conversion layer, and between the substrate and the second wavelength conversion layer. . The laminated body according to item 9 of the scope of patent application, wherein the first wavelength conversion layer, the second wavelength conversion layer, or the color filter that diffuses the light contains an inorganic compound or an organic compound. Light-diffusing particles, the inorganic compound is selected from the group consisting of metal oxides, sulfides, sulfates, halides, nitrides, and silicates, the organic compound includes a polymer, and the light containing the organic compound Diffusion particles are hollow particles. The laminated body according to claim 9, wherein the first wavelength conversion layer, the second wavelength conversion layer, or the color filter that diffuses the light includes pores containing air. The laminated body according to claim 11, wherein the light diffusion particles are included in the first wavelength conversion layer and the second wavelength conversion layer. The laminated body according to claim 12, wherein the pores are included in the first wavelength conversion layer and the second wavelength conversion layer. The laminated body according to item 9 in the scope of patent application, wherein the first wavelength conversion layer and the second wavelength conversion layer include 650 nm to 650 nm to 600 nm, which absorb the light, respectively. A fluorescent material that gives a luminescent peak in the range of 750 nm. A display device includes: a display substrate, a first pixel, a second pixel, and a third pixel on the display substrate, and an application on the first pixel, the second pixel, and the third pixel as claimed The laminated body according to claim 9, wherein the first wavelength conversion layer, the second wavelength conversion layer, the light transmitting layer, and the color filter are sandwiched between the display substrate and the color filter. The substrate is arranged, and the first wavelength conversion layer, the second wavelength conversion layer, and the light-transmitting layer are arranged so as to overlap the first pixel, the second pixel, and the third pixel, respectively. . A laminated body comprising: a substrate; a wavelength conversion layer on the first surface side of the substrate; a color filter on the first surface side of the substrate, overlapping with the wavelength conversion layer and at 400 nm An absorption peak in a range of -500 nm; and a light diffusion layer located on the first surface side of the substrate, diffusing light in a wavelength range of 400 nm to 500 nm. A laminated body comprising: a substrate having a first region, a second region, and a third region on a first surface; a first wavelength conversion layer located on the first surface side and overlapping the first region; a second The wavelength conversion layer is located on the first surface side and overlaps the second region; the light-transmitting layer is located on the first surface side and overlaps the third region; a color filter is located on the first surface On the surface side, overlapping the first wavelength conversion layer and the second wavelength conversion layer in the first region and the second region, and having an absorption peak in a range of 400 nm to 500 nm; and light The diffusion layer is located on the first surface side and overlaps the first wavelength conversion layer, the second wavelength conversion layer, and the color filter in the first region and the second region, and Light in a wavelength range of 400 nm to 500 nm is diffused; the first wavelength conversion layer and the second wavelength conversion layer absorb light in a wavelength range of 400 nm to 500 nm and emit light in different colors.