JP2019040179A - Laminate and display including laminate - Google Patents

Abstract

To provide a laminate that is applicable to a color conversion system and can provide a color excellent in color purity, and a display including the laminate.SOLUTION: There is disclosed a laminate comprising: a substrate; a wavelength conversion layer located on a first surface of the substrate; and a color filter located on the first surface of the substrate and having an absorption peak within a range of 400 nm to 500 nm. At least one of the wavelength conversion layer and color filter is configured to diffuse light within a wavelength range of 400 nm to 500 nm.SELECTED DRAWING: Figure 4

Description

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

  As a typical example of a display device, a liquid crystal display device, an organic EL (Electroluminescence) display device, and the like are known. The display device has a plurality of pixels each providing one of the three primary colors, that is, red, green, and blue on the substrate, and full color display is performed by appropriately driving these pixels.

  Methods for performing full-color display are roughly divided into three-color methods (painting method), white methods (white + color filter method), and color conversion methods. The three-color method is a method often used in organic EL display devices, in which a light emitting layer that gives different light emission is installed for each pixel, and light emission from the light emitting layer is directly used for image formation. The white method is a method applicable to both a liquid crystal display device and an organic EL display device, and is a method of adjusting light from a white light emitting element or a backlight that gives white using a color filter. With this method, light based on the optical characteristics of the color filter can be obtained for each pixel. In the color conversion method, light from a blue light emitting element or a light source such as a backlight that gives blue is used as excitation light, and green light emission, red light emission obtained from a fluorescent material that emits green or red light, and blue light from the light source Full color display is performed by combining light emission. For example, Patent Documents 1 and 2 disclose liquid crystal display devices that employ a color conversion method.

JP-A-2006-58586 JP 2016-212348 A

  One embodiment of the present invention is applicable to full-color display of a color conversion method, and a stacked body that can extract light with excellent color purity from monochromatic light reduction, and a display device including the stacked body Is one of the issues.

  One embodiment of the present invention is a substrate, a wavelength conversion layer located on the first surface side of the substrate, and a first surface side of the substrate, overlapping the wavelength conversion layer and in a range of 400 nm to 500 nm. A laminate including a color filter having an absorption peak. 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 includes a substrate having a first region, a second region, and a third region on a first surface, a first surface located on the first surface side, and overlapping the first region. One wavelength conversion layer, a second wavelength conversion layer located on the first surface side and overlapping the second region, a light transmission layer located on the first surface side and overlapping the third region, and the first The multilayer body includes a color filter that overlaps the first wavelength conversion layer and the second wavelength conversion layer in the second region and the second region. The color filter has an absorption peak in the 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 substrate, a wavelength conversion layer located on the first surface side of the substrate, and located on the first surface side of the substrate, overlapping the wavelength conversion layer and absorbing in the range of 400 nm to 500 nm. A laminate including a color filter having a peak and a light diffusion layer located on the first surface side of the substrate and diffusing light in a wavelength range of 400 nm to 500 nm.

  One embodiment of the present invention includes a substrate having a first region, a second region, and a third region on a first surface, a first surface located on the first surface side, and overlapping the first region. 1 wavelength conversion layer, located on the first surface side, the second wavelength conversion layer overlapping the second region, the light transmission layer located on the first surface side, overlapping the third region, A color filter that overlaps the first wavelength conversion layer and the second wavelength conversion layer in the region and the second region and has an absorption peak in the range of 400 nm to 500 nm; and the first in the first region and the second region. A light diffusion layer is provided that overlaps the wavelength conversion layer, the second wavelength conversion layer, and the color filter and diffuses light in the wavelength range of 400 nm to 500 nm. The first wavelength conversion layer and the second wavelength conversion layer absorb light in the 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, pixels on the display substrate, and a stacked body positioned on the pixels. The laminate is a laminate comprising 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 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. The wavelength conversion layer and the color filter are disposed between the display substrate and the substrate so as to overlap the pixels.

  One embodiment of the present invention includes a display substrate, a first pixel, a second pixel, and a third pixel on the display substrate, and a first pixel, a second pixel, and a third pixel. It is a display apparatus which has a laminated body located in. The stacked body includes 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, The second wavelength conversion layer located on the first surface side and overlapping the second region, the light transmission layer located on the first surface side and overlapping the third region, and located on the first surface side And a color filter that overlaps the first region and the second region. The color filter has an absorption peak in the 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 transmission layer, and the color filter are disposed 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 transmission layer are disposed so as to overlap with the first pixel, the second pixel, and the third pixel, respectively.

1 is a schematic top view of a display device according to an embodiment of the present invention. 1 is a schematic top view of a pixel of a display device according to an embodiment of the present invention. 1 is a schematic cross-sectional view of a pixel of a display device according to an embodiment of the present invention. The cross-sectional schematic diagram of the laminated body of one Embodiment of this invention. The cross-sectional schematic diagram of the laminated body of one Embodiment of this invention. The cross-sectional schematic diagram of the laminated body of one Embodiment of this invention. The cross-sectional schematic diagram of the laminated body of one Embodiment of this invention. 1 is a schematic top view of a pixel of a display device according to an embodiment of the present invention. 1 is a schematic cross-sectional view of a pixel of a display device according to an embodiment of the present invention. 1 is a schematic top view of a pixel of a display device according to an embodiment of the present invention. 1 is a schematic cross-sectional view of a pixel of a display device according to an embodiment of the present invention. Relative light receiving intensity at 650 nm before and after the post-baking of Samples 10 to 12 in Examples.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention can be implemented in various modes without departing from the gist thereof, and is not construed as being limited to the description of the embodiments exemplified below.

  In order to make the explanation clearer, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part as compared to the actual embodiment, but are merely examples and limit the interpretation of the present invention. Not what you want. In this specification and each drawing, elements having the same functions as those described with reference to the previous drawings may be denoted by the same reference numerals, and redundant description may be omitted.

  When a plurality of films are formed by processing one film, the plurality of films may have different functions and roles. However, the plurality of films are derived from films formed as the same layer in the same process, and have the same layer structure and the same material. Therefore, in the present specification and claims, these plural films are defined as existing in the same layer.

(First embodiment)
In the present embodiment, a structure of a stacked body 170 that is one embodiment of the present invention and a display device 100 including the stacked body 170 will be described.

[1. overall structure]
A top view of the display device 100 is shown in FIG. The display device 100 includes a plurality of pixels 104 on a display substrate 102, and a display region 106 is defined on the display substrate 102 by these pixels 104. Each pixel 104 includes various display elements such as a liquid crystal element, an organic EL element, a current-driven light emitting diode (LED), and a micro electromechanical (MEMS) shutter. The arrangement of the pixels 104 is not limited, and various arrangements such as a stripe arrangement and a delta arrangement can be employed. In this embodiment, a mode using a liquid crystal element as a display element will be described.

  A drive circuit for driving the pixels 104 is provided in a region (peripheral region) surrounding the display region 106. In the example illustrated in FIG. 1, two gate side driver circuits 108 and a source side driver circuit 110 sandwiching the display region 106 are provided. A wiring (not shown) extends from the display region 106, the gate side driver circuit 108, and the source side driver circuit 110 to one side of the display substrate 102, and is exposed at an end portion of the display substrate 102 to form a terminal 114. The terminal 114 is electrically connected to a flexible printed circuit board (FPC) 116. A driver IC 112 for controlling the pixel 104 may be further mounted on the FPC 116 or the display substrate 102. Note that this function may be realized by the driver IC 112 without providing the source side driver circuit 110 on the peripheral region. The display element is controlled by the gate side driver circuit 108, the source side driver circuit 110, and the like, whereby an image is displayed in the display area 106.

[2. Pixel]
FIG. 2 shows a schematic top view of the pixel 104. In FIG. 2, three adjacent pixels 104 are shown. For the sake of clarity, the pixel electrode 152, the capacitor electrode 151, the counter electrode 156, and some of them are not drawn in some 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 that are 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 scanning line 122 and the capacitance line 124 are connected to a plurality of pixels 104 arranged in the direction in which the scanning line 122 and the capacitance line 124 extend, and each signal line 120 is arranged in a plurality in the direction in which the signal line 120 extends. Connected to the pixel 104.

  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 which is a part of the scanning line 122 (a part protruding downward in the drawing), and a source which is a part of the signal line 120 (a part protruding to the right side in the drawing). / Drain electrode 136, source / drain electrode 138, and the like. In the present specification and claims, the source electrode and the drain electrode may be interchanged depending on the direction of current, the polarity of the transistor, or the like. Accordingly, these are referred to as source / drain electrodes without particular distinction.

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

  FIG. 3 is a schematic cross-sectional view taken along the chain line AA ′ in FIG. 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 blue light is light having an emission peak in the region of 400 nm to 500 nm, 435 nm to 500 nm, or 435 nm to 480 nm, and the emission spectrum thereof deviates from this wavelength range (hereinafter referred to as blue wavelength region). Good. Moreover, you may have two or more light emission peaks in this wavelength range. Although details are omitted, the backlight unit 190 is configured by a blue light emitting LED, a light guide plate, or the like. Although there is no limitation in the material of the active layer of LED, blue light emission can be obtained by utilizing compound semiconductors, such as InGaN, for example.

  A polarizing plate 126 is provided between the backlight unit 190 and the display substrate 102. In the configuration illustrated in FIG. 3, the polarizing plate 126 is provided so as to be in contact with the backlight unit 190 and the display substrate 102, but another layer or member may be inserted between them.

  As shown in FIG. 3, the transistor 130 is provided on the display substrate 102 through 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 and source / drain electrodes 136 and 138 are provided thereon. Although the transistor 130 illustrated in FIG. 3 is a bottom-gate transistor, the structure of the transistor 130 is not limited. The transistor 130 may be a top-gate transistor and may have a structure in which gate electrodes are provided above and below the semiconductor film 134. Good. Further, there is no restriction on the vertical relationship between the semiconductor film 134 and the source / drain electrodes 138 and 136.

  The capacitor 150 can also be provided over 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 may be provided so as to cover the transistor 130 and the capacitor 150, and may be formed to have a thickness so as to absorb unevenness caused by these and provide a flat surface. A pixel electrode 152 is provided on the interlayer insulating film 144, and the pixel electrode 152 is electrically connected to the source / drain electrode 138 in a contact hole 146 formed in the interlayer insulating film 144.

  The pixel 104 further includes a first alignment film 148 that covers 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 the initial alignment of the liquid crystal molecules (when no potential difference is applied between the pixel electrode 152 and the counter electrode 156). ) Is determined. A second alignment film 154, a counter electrode 156, and a polarizing plate 128 are provided over the first alignment film 148 with the liquid crystal layer 160 interposed therebetween. The light from the backlight unit 190 that has passed through the polarizing plate 126 has its polarization plane rotated by the liquid crystal layer 160 and is emitted through the polarizing plate 128. The rotation of the polarization plane is determined by the orientation of the 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 liquid crystal molecules change from an initial alignment state to an alignment state determined by an electric field. With the change in the alignment state, the light transmittance of the liquid crystal element changes, and a gradation display is realized.

[3. Laminate]
On the pixel 104, a stacked body 170 that performs wavelength conversion of light extracted from the backlight unit 190 through the liquid crystal layer 160 is formed. The laminate 170 includes a wavelength conversion layer 172 and a color filter 174, and may further include a light transmission layer 176 described later. Note that the substrate 118 may be recognized as one of the structures of the stacked body 170, and the following description will be given under this recognition.

  In the stacked body 170, the substrate 118, the wavelength conversion layer 172, and the color filter 174 overlap each other. That is, the wavelength conversion layer 172 and the 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.

  Note that the display device 100 has an arbitrary configuration, for example, a light shielding film (black matrix) 164 that overlaps the transistor 130, the signal line 120, and the scanning line 122, or a protective film that covers the light shielding film 164, the wavelength conversion layer 172, and the color filter 174. (Hereinafter referred to as overcoat) 162 may be provided. Further, an adhesive layer (not shown) may be provided between the overcoat 162 and the polarizing plate 128, and the polarizing plate 128 and the laminated body 170 may be fixed using this. The overcoat 162 can include a silicon-containing inorganic compound such as silicon nitride or silicon oxide, or a polymer material such as polyolefin, polycarbonate, polyester, epoxy resin, or acrylic resin. Although not shown, a substrate (such as a glass substrate or a plastic substrate) that transmits visible light between the polarizing plate 128 and the overcoat 162 (between the polarizing plate 128 and the stacked body 170 when the overcoat 162 is not provided). ) May be further provided.

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

  In the pixel 104r, the stacked body 170 includes a wavelength conversion layer 172r and a color filter 174 that overlap each other. Similarly, in the pixel 104g, the stacked body 170 includes a wavelength conversion layer 172g and a color filter 174 that overlap each other. On the other hand, in the pixel 104b, the wavelength conversion layers 172g and 172r and the color filter 174 are not provided, and the light transmission layer 176 is formed. Hereinafter, the wavelength conversion layers 172g and 172r will be referred to as the wavelength conversion layer 172 unless any of these is particularly distinguished. Further, the wavelength conversion layers 172g and 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 layers 172g and 172r are films having a function of absorbing light from the backlight unit 190, that is, blue light, and emitting green and red light, respectively. That is, the film exhibits photoluminescence using blue light as excitation light. Thereby, green and red light can be obtained from the pixels 104g and 104r, respectively.

  The wavelength conversion layers 172g and 172r having such a function include a fluorescent dye (hereinafter referred to as a fluorescent material) and a matrix for dispersing the fluorescent material. The fluorescent material may be a dye or a pigment. Examples of fluorescent materials include organic compounds such as coumarin dyes, quinacridone dyes, anthracene dyes, pyrene dyes, pyran dyes, quinolinol complex dyes, and compounds containing metals such as gallium, selenium, zinc, indium, and cadmium. A semiconductor etc. are mentioned. When a compound semiconductor is used, quantum dots whose size is controlled from several nm to several tens of nm may 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, or lead and a group 16 element such as sulfur, selenium, or tellurium, and examples thereof include CdSe and ZnS. Alternatively, a compound of a group 13 element such as indium or gallium and a group 15 element such as phosphorus or arsenic is exemplified, and InP, GaAs, and the like are exemplified.

  As the matrix, a polymer material having a small absorption with respect to visible light or having no absorption peak in the visible light region can be used. Examples thereof include polymer materials such as polymethacrylic acid ester, polyacrylic acid ester, aromatic polycarbonate, polyolefin, and polystyrene. Alternatively, light 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 liquid containing the matrix and the fluorescent material by an inkjet method or a printing method, and then drying or curing.

  The wavelength conversion layer 172 may further include an antioxidant for preventing oxidation of the fluorescent material. As an antioxidant, for example, a phosphorus-based antioxidant having a basic skeleton of trialkyl phosphite, alkylallyl phosphite, triallyl phosphite, etc., and having a sterically hindered substituent such as a t-butyl group at the ortho position A phenol-based antioxidant having one or more phenol skeletons, a sulfur-based antioxidant having a thioether group, and the like can be used. 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 that is transmitted without being absorbed by the wavelength conversion layers 172g and 172r. 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 that has an absorption peak in the blue wavelength region and does not exhibit absorption in other wavelength regions, or has a characteristic that absorption in other wavelength regions is small compared to the blue wavelength region. . Therefore, for example, yellow light (for example, light having a spectrum peak in the range of 550 nm to 600 nm) is easily transmitted. The color filter 174 includes a pigment having such optical characteristics. The dye may be either a dye or a pigment. I. Pigment Yellow 150, 213, 215, 185, 138, 139, C.I. I. One or a plurality of dyes such as Solvent Yellow 21, 82, 83: 1, 33, and 162 can be selected.

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

3-3. Light Transmission Layer The light transmission layer 176 includes a material that does not absorb in the blue region or does not show an absorption peak, and has a function of efficiently transmitting light from the backlight unit 190. Specifically, the above-described polymer material can 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 transmission layer 176. Note that although not illustrated, insulating films 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 transmission layer 176. This insulating film can contain, for example, a silicon-containing inorganic compound such as silicon oxide or silicon nitride, and can have a single layer structure or a laminated structure. By providing this insulating film, diffusion of impurities contained in the substrate 118 can be prevented.

3-4. Light Diffusion In the laminate 170 of this embodiment, at least one of the color filter 174 and the wavelength conversion layer 172 is configured to diffuse at least the light in the blue wavelength region from the light from the backlight unit 190.

  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 diffusing particles 180 may include an inorganic compound or an organic compound. Inorganic compounds include metal oxides, sulfides, sulfates, halides, nitrides, silicates, etc., calcium carbonate, barium sulfate, titanium dioxide, silicon dioxide (silica gel), zirconium oxide, silicic acid Examples include aluminum. Examples of the organic compound include polymers having a basic skeleton of polymethacrylic acid ester, polyacrylic acid ester, polycarbonate, polystyrene, polyolefin, or polynorbornene. These polymers may be cross-linked between molecules. Alternatively, a polymer in which a halogen such as fluorine, chlorine or bromine is introduced into the main chain or side chain may be used. Examples of the polymer into which fluorine is introduced include fluorine-containing polyolefins such as polytetrafluoroethylene. When a polymer is used, the light diffusion particle 180 may have a three-dimensional structure having a hollow structure. That is, the light diffusing particles 180 having a core-shell structure, the shell portion being composed of a polymer, and the core portion containing air may be used.

  Alternatively, at least one of the color filter 174 and the wavelength conversion layer 172 has a plurality of pores 182, and light diffusion is realized using a difference in refractive index between air contained in the pores 182 and the matrix. Also good.

  There is no restriction | limiting in the shape of the light-diffusion particle | grains 180 and the pore 182. FIG. The average particle diameter of the light diffusing particles 180 and the average diameter of the pores 182 can be 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, the concentration is 5% by weight or more and 20% by weight or less, or 5% by weight or more and 10% by weight or less when the total amount of the wavelength changing layer 172 is 100% by weight. And it is sufficient. The color filter 174 and the wavelength conversion layer 172 containing the light diffusing particles 180 add the light diffusing particles 180 to a mixed solution of a matrix and a dye or a fluorescent material, and the mixed solution is added by an inkjet method or a printing method. It can be formed by coating and then drying or curing.

  On the other hand, the light transmission layer 176 does not need to be provided with a light diffusion function. Therefore, the addition of the light diffusing particles 180 and the formation of the pores 182 do not need to be performed in the light transmission layer 176, and may be performed selectively with respect to either the color filter 174 or the wavelength conversion layer 172, or both.

  In a display device employing a light conversion method, it is known that light passing through a wavelength conversion layer without wavelength conversion can be absorbed to some extent by the color filter by laminating a wavelength conversion layer and a color filter. Thereby, in a pixel that gives light having a relatively long wavelength (for example, a pixel that gives green or red), color mixing caused by light having a short wavelength can be suppressed to some extent.

  However, with color filters alone, it is difficult to completely absorb light that has not been wavelength-converted. For this purpose, a color filter with a very large thickness is used, or the dye content of the color filter is greatly increased. Need to increase. According to the calculation by the inventors, in order to completely absorb the light emitted from the backlight unit and not wavelength-converted by the wavelength conversion layer, it is 90% by weight or more in the case of a thin film color filter of 1 μm or less. Is required. A color filter having such a high pigment content is stably present as an independent film and is virtually impossible to produce.

  On the other hand, the inventors configured the wavelength conversion layer 172 or the color filter 174 to diffuse light in the blue wavelength region, so that the apparent light conversion efficiency of the wavelength conversion layer 172 (that is, the appearance) As a result, the intensity of light transmitted through the wavelength conversion layer 172 is reduced without being wavelength-converted, and the color mixture of light extracted from the pixels 104g and 104r can be effectively suppressed. I found it possible. Therefore, by using the stacked body 170, blue, green, and red with 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 of the color filter 174 can be reduced. As a result, the display device can be further thinned and the manufacturing cost can be reduced.

Second Embodiment
The configuration of the stacked body 101 is not limited to the structure shown in the first embodiment, and can be changed to various structures. For example, in the stacked body 170 of the first embodiment, the wavelength conversion layers 172 are not in contact with each other on the light shielding film 164 (FIG. 4), but as shown in FIG. The wavelength conversion layers 172 may be in contact with each other and may overlap. In the example shown in FIG. 5A, the wavelength conversion layers 172g and 172r are in contact with each other and overlap each other.

  In the stacked body 170 of the first embodiment, the color filter 174 is 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. 5B, the color filters 174 may be separated from each other between adjacent pixels 104. In this case, the light shielding film 164 may be in contact with the overcoat 162 or the wavelength conversion layer 172.

  Alternatively, as illustrated in FIG. 6, the light transmission layer 176 may be provided in the pixels 104 g and 104 r so as to overlap with the wavelength conversion layer 172 of not only the pixel 104 b but also the pixels 104 g and 105 r without providing the overcoat 162. In this case, the light transmission layer 176 can also function as an adhesive layer that bonds the stacked body 170 and the polarizing plate 128 together.

  Even if the configuration described above is adopted, the same effect as that of the stacked body 170 of the first embodiment can be realized. Therefore, by applying the laminate 170 of the present embodiment, not only a wide color gamut can be given to the display device, but also the display device can be made thinner and the manufacturing cost can be reduced.

<Third Embodiment>
In the present embodiment, a description is given of a stacked body 184 having a structure different from that of the stacked body 170 described in the first embodiment. A description of the configuration similar to or the same as that of the first and second embodiments may be omitted.

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

  More specifically, as illustrated in FIG. 7, the stacked 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. Similar to the stacked body 170, the stacked body 184 may include a light transmission layer 176. In the example shown in FIG. 7, the light transmission layer 176 overlaps with the pixel 104b, the wavelength conversion layers 172g and 172r overlap with the pixels 104g and 104r, respectively, and the color filter 174 and the light diffusion layer 178 overlap with both the pixels 104g and 104r. . 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 light diffusing particles 180 are not added or the pores 182 are not formed in the color filter 174 and the wavelength conversion layers 172g and 172r. On the other hand, the light diffusion layer 178 includes a matrix and includes light diffusion particles 180 or pores 182. These matrices, light diffusion particles 180, and pores 182 are the same as those in the first embodiment.

  In the laminate 184, the light from the backlight unit 190 is diffused in the light diffusion layer 178, and as a result, the apparent light conversion efficiency in the wavelength conversion layer 172 is improved. For this reason, the intensity of the light transmitted through the wavelength conversion layer 172 without wavelength conversion is reduced, and the transmitted light is efficiently absorbed by the color filter 174. Accordingly, blue, green, and red with 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 of the color filter 174 can be reduced, which contributes to further thinning of the display device and reduction of manufacturing costs.

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

  FIG. 8 is a schematic top view of the pixel 105, and FIG. 9 is a schematic cross-sectional view taken along the chain line CC ′ of FIG. As shown in these drawings, the pixel 105 is different from the pixel 104 in that the pixel electrode 152 has a comb-like shape and the pixel electrode 152 is formed over the counter electrode 156 with the insulating film 145 interposed therebetween. one of. The pixel electrode 152 has a slit 153. The slit 153 may be closed or open. In the example shown in FIG. 8, both the closed slit 153 and the open 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 over the transistor 130 and a contact hole 146 provided in the planarization film 158.

  The counter electrode 156 is arranged in a stripe shape in the direction in which the scanning line 122 extends, and is 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 such a 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 the display device 100 is driven in an IPS (In-Plane Switching) mode by the electric field.

  Similar to the display device 100 of the first embodiment, the stacked body 170 and the stacked body 184 can be provided also on the pixel 105 having such a structure. Therefore, by applying this embodiment, an IPS liquid crystal display device having a wide color gamut and being made thinner can be provided at low cost.

<Fifth Embodiment>
In the present embodiment, an organic EL display device which is one embodiment of the present invention will be described. The description of the configuration similar to or the same as that described in the first to fourth embodiments may be omitted.

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

  FIG. 10 is a schematic top view of three adjacent pixels 104, and FIG. 11 is a schematic cross-sectional view taken along the chain line DD ′ in FIG. For the sake of clarity, the counter electrode 244, the pixel electrode 240, the capacitor electrode 220, or a part thereof is not drawn in some pixels 104. As shown in these drawings, the organic EL display device includes a plurality of scanning lines 202, a plurality of signal lines 200, and a plurality of current supply lines 204 that are 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 scanning line 202 is connected to a plurality of pixels 104 arranged in a direction in which the scanning line 202 extends, and each signal line 200 and the current supply line 204 are connected to a plurality of pixels 104 arranged in a direction in which these wirings extend. Connected.

  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 which is a part of the scanning line 202 (a part protruding downward in the figure) and a source / drain electrode which is a part of the signal line 200 (a part protruding rightward in the figure). 216, a semiconductor film 212, a source / drain electrode 218, and the like. The source / drain electrode 218 is connected to the capacitor electrode 220 existing in the same layer as the scanning line 202 via the contact hole 224. The drive transistor 230 includes a gate electrode 234 which is a part of the capacitor electrode 220 (a part protruding downward in the figure) and a source / drain electrode which is a part of the current supply line 204 (a part protruding to the left side in the figure). 236, part of the semiconductor film 232, source / drain electrodes 238, and the like. A capacitor 250 is formed by another part of the semiconductor film 232, a gate insulating film 252, which will be described later, and the capacitor electrode 220.

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

  An opening exposing the source / drain electrode 238 is provided in the planarizing film 256 that covers the driving transistor 230 and the capacitor 250 and provides a flat surface. The electrical connection between the driving transistor 230 and the pixel electrode 240 on the planarizing film 256 is provided. A connection is made. The pixel electrode 240 is configured to reflect visible light, and is formed to include a metal having a high reflectance such as aluminum or silver. Alternatively, a conductive oxide film that transmits visible light, such as indium-tin oxide (ITO) or indium-zinc oxide (IZO), may be provided over the metal. Thereby, the hole injection barrier to the electroluminescent layer (hereinafter referred to as EL layer) 242 described below can be reduced.

  An end portion of the pixel electrode 240 is covered with a partition wall 258, and an EL layer 242 is formed over the pixel electrode 240 and the partition wall 258. The structure of the EL layer 242 is arbitrary. For example, the EL layer 242 is formed by appropriately combining functional layers 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. . In FIG. 11, a hole injection / transport layer 242a, a light emitting layer 242b, and an electron injection / transport layer 242c are illustrated as typical functional layers. 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 between the pixels 104.

  The light-emitting layer 242b that emits blue light may be formed of a single compound or may have a so-called host-guest structure. In the case of the host-guest type, examples of the host material include condensed aromatic compounds such as stilbene derivatives and anthracene derivatives, nitrogen-containing heteroaromatic compounds such as carbazole derivatives, aromatic amines, and phenanthroline derivatives. The guest is selected from a fluorescent material or a phosphorescent material which functions as a light emitting material in the host-guest type light emitting layer 242b and gives a light emission peak in the blue light emitting region. Examples of the fluorescent material include compounds having a relatively short conjugation length such as a coumarin derivative, a pyran derivative, a quinacridone derivative, a pyrene derivative, and an anthracene derivative. As the phosphorescent dye, an iridium-based orthometal complex or the like can be used. In the case where the light-emitting layer 242b is formed using a single compound, the above-described host material can be used. In this case, the host material functions as a light emitting material.

  A counter electrode 244 is provided over the EL layer 242. The counter electrode 244 is configured to transmit at least part of visible light. Specifically, a layer containing a conductive oxide that transmits visible light such as ITO or IZO, a film that is formed with a thickness that allows visible light to pass through, and that includes a metal with a relatively low work function such as magnesium, or These stacked layers are used as the counter electrode 244. An organic EL element is constructed by 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 can be provided. The protective film 260 preferably has a low water or oxygen permeability, and includes, for example, silicon nitride.

  On each pixel 104, a stacked body 170 or a stacked body 184 is provided. The light transmission layer 176 (see FIG. 6) of the stacked bodies 170 and 184 overlaps with the pixel 104b that obtains blue light emission, and the wavelength conversion layer 172g and the color filter 174 overlap with the pixel 104g that extracts green light emission, and the wavelength conversion layer 172r and the color filter. The stacked bodies 170 and 184 are arranged so that 174 overlaps the pixel 104r that extracts red light emission. In the pixel 104b, light generated in the EL layer 242 passes through the light transmission layer 176, and blue light is observed. On the other hand, in the pixels 104g and 104r, the light generated by the EL layer 242 is converted into green and red light by the wavelength conversion layers 172g and 172r, respectively, and is transmitted through the wavelength conversion layer 172 without wavelength conversion. Is absorbed by the color filter 174. Accordingly, blue, green, and red with 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 can be reduced. As a result, the display device can be further thinned and the manufacturing cost can be reduced.

  In this example, the result of evaluating the optical characteristics of the wavelength conversion layer 172 having the structure described in the above embodiment will be described.

[1. Synthesis of fluorescent material]
1-1. Preparation of In (OLA) ₃ solution In a three-necked flask equipped with a connecting tube to a vacuum line and a nitrogen line, a thermocouple thermometer, and a septum, 0.57 g of indium acetate (In (OAc) ₃ ), oleic acid (OLA) ) 1.66 g and octadecene (ODE) 7.52 g. The inside of the flask was heated at 260 ° C. for 1 hour while reducing the pressure using an oil rotary vacuum pump to remove acetic acid, water, and oxygen generated from this mixture. Thereby, an In (OLA) ₃ solution (solution A) was obtained.

1-2. Preparation of P (SiMe3) ₃ .octadecene solution 0.25 g of tris (trimethylsilyl) phosphine (P (SiMe ₃ ) ₃ ) and 0.98 g of ODE were mixed in a glove box, and the resulting P (SiMe3) ₃ · ODE solution (Solution B) was sealed in a pressure-resistant vial.

1-3. Synthesis of InP Core Solution A was heated to 300 ° C. in a flask, and 20 wt% ODE solution of zinc myristate separately prepared and degassed, and Solution B were sequentially added to Solution A using a cannula. Then, it was made to react at reaction temperature 270 degreeC for 2 hours, and it 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 serving as a ligand were 2 mmol, 1 mmol, and 3 mmol, respectively.

  The obtained flask containing the reaction solution was transferred into a glove box, and the reaction solution was transferred to a beaker. After 8 g of toluene was added to the beaker containing the reaction solution, 100 g of n-butanol was added to precipitate the particles. Thereafter, centrifugation was performed to separate the particles. 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 redispersed liquid, the particles were precipitated again, the supernatant was removed by decantation, and the obtained particles were vacuum dried (50 ° C., 1.0 Torr, 1 hour). 10 g of hexane was added to the dried particles and redispersed to obtain a hexane dispersion of InP core.

1-4. Synthesis of ZnS Shell From the obtained core dispersion, a 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 at 60 ° C. under vacuum for 1 hour. Heat to remove hexane. After making the inside of a flask nitrogen atmosphere, this 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 dodecanethiol 3.75 mmol / ODE 5 g solution was added dropwise over 30 minutes, and then maintained at the same temperature for 1.5 hours. Further, 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. In this synthesis, a ZnS shell is formed by the reaction of Zn (OLA) ₂ and dodecanethiol. Moreover, the dodecanethiol added at the end adheres to the outer surface of the ZnS shell as a ligand (second ligand). That is, the obtained quantum dot has a core-shell type nanocrystal in which an InP core is coated with a ZnS shell, and dodecanethiol attached to the nanocrystal as a ligand.

[2. Evaluation of fluorescent materials]
The average particle diameter of the quantum dots obtained using a transmission electron microscope (SEM: JEM-2010F manufactured by JEOL Ltd.) was measured. Specifically, the major axis and minor axis of 20 arbitrarily selected quantum dots were measured, the diameter of each particle ((major axis + minor axis) / 2) was determined, and the average value was calculated. The average particle size of the quantum dots was 4.8 nm.

  The quantum dots were evaluated by elemental mapping using EDS (energy dispersive X-ray analysis) mounted on the SEM. As a result, it was confirmed that the number of particles containing only ZnS was less than 1 per 100 core-shell nanocrystals. From this, it was confirmed that substantially all of Zn and S covered the core-shell nanocrystal containing In and P.

[3. Formation of wavelength conversion layer 172]
As the light diffusing particles 180, titanium oxide particles (A-190 manufactured by Sakai Chemical Co., Ltd., average particle size 150 nm) or yttrium oxide particles (manufactured by Japan Yttrium Co., Ltd., average particle size 150 nm) were used. Moreover, BYK-102 (manufactured by Big Chemie) was used as a dispersant for yttrium oxide particles, and 2-methacryloyloxyethyl succinic acid / benzyl methacrylate copolymer was used as a dispersant for titanium oxide particles. As antioxidant, phosphorus antioxidant (Johoku Chemical Co., Ltd. JA-805) or phenolic antioxidant (Adeka AO-80) was used. Cyclohexyl methacrylate / succinic acid mono (2-methacryloyl acrylate) copolymer was used as the resin, and dipentaerystol hexaacrylate was used as the crosslinking agent. The resin and the polymer of the crosslinking agent correspond to the matrix of the wavelength conversion layer 172. As the radiation sensitive compound, a mixture of 2,4,6-trimethylbenzoyldiphenylphosphine oxide (Lucirin LR8953X manufactured by BASF) and O-acyl oxime compound (NCI-930 manufactured by ADEKA) in a mass ratio of 1: 1 was used. . Propylene glycol monomethyl ether acetate was used as a solvent for producing the wavelength conversion layer 172.

A dispersion of propylene glycol monomethyl ether acetate containing a crosslinking agent, a resin, a radiation sensitive compound, light diffusing particles 180, a dispersing agent, a fluorescent material, and an antioxidant is prepared, and this dispersion is converted to an alkali-free glass using a spinner. After coating on the substrate, a coating film was formed by prebaking on a hot plate at 90 ° C. for 2 minutes. Next, irradiation with radiation (exposure 120 mJ / cm ² ) was performed using a high-pressure mercury lamp to form a cured film. Development was performed at 23 ° C. for 60 seconds using a 0.05 wt% potassium hydroxide aqueous solution with respect to the cured film. Thereby, the wavelength conversion layer 172 was formed. The conditions for coating with a spinner and the concentration of the dispersion were adjusted so that the wavelength conversion layer 172 had a thickness of 10 nm. The composition ratios of main components in the dispersion are as shown in Tables 1 to 3. The composition of the crosslinking agent, the resin and the radiation sensitive compound in the dispersion was 15% by weight, 15% by weight and 3% by weight, respectively.

[4. Formation of color filter 174]
As a coloring agent, C.I. I. Pigment Yellow 139, BYK-LPN21116 (manufactured by Big Chemie) as a dispersant, methacrylic acid / styrene / benzyl methacrylate / 2-hydroxyethyl methacrylate / 2-ethylhexyl methacrylate copolymer as a resin, and dipentaerystol as a crosslinking agent Mass ratio of 2-benzyl-2-dimethylamino-4′-morpholinobutyrophenone (IRGACURE369 manufactured by BASF) and O-acyloxime compound (NCI-930 manufactured by ADEKA) as a radiation sensitive compound is 1: 1. A dispersion for forming a color filter 174 of propylene glycol monomethyl ether acetate containing these mixtures was prepared. The composition of the colorant, the dispersant, the resin, the crosslinking agent, and the radiation-sensitive compound in the dispersion is 10.5% by weight, 3.1% by weight, 1.9% by weight, 5.1% by weight, and 0.8%, respectively. It was 6% by weight.

A dispersion of propylene glycol monomethyl ether acetate containing a colorant, a dispersant, a resin, a crosslinking agent, and a radiation-sensitive compound is prepared, applied onto the cured film with a spinner, and then heated on a hot plate at 90 ° C. A coating film was formed by pre-baking for a minute. Next, irradiation with radiation was performed using a high-pressure mercury lamp (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 application using a spinner and the concentration of the dispersion were adjusted so that the thickness of the color filter 174 was 1 μm.

[5. Evaluation method]
Measurement was performed using a total luminous flux measuring device manufactured by Otsuka Electronics. Specifically, a blue LED is used as a light source, a wavelength conversion layer 172 or a laminated film of the wavelength conversion layer 172 and the color filter 174 is disposed on the light source, and light transmitted through these layers and films is collected by an integrating sphere. Fluorescence intensity evaluation was performed with light. The evaluation is performed by calculating and comparing the relative intensities (relative light receiving intensities) of light at 450 nm and 650 nm in each sample when the intensity at 450 nm (sample 1 in Table 1) of the light transmitted only through the alkali-free glass substrate is 100. I went there.

[6. Effect of light diffusion particle 180]
In order to examine the effect of the light diffusing particles 180, samples 1 to 5 were prepared. Samples 1 and 2 correspond to blank experiments, and in these samples, only a non-alkali glass substrate or only a matrix formed on the non-alkali glass substrate and containing neither the fluorescent material nor the light diffusion particles 180 is used. It was. On the other hand, Sample 3 is a sample in which a wavelength conversion layer 172 that does not include the light diffusing 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 ) is formed as the light diffusing particles 180, respectively.

  The results of Samples 1 and 2 indicate that the matrix itself hardly absorbs 450 nm blue light and does not have a function of converting blue light into long wavelength light (650 nm). From the result of the sample 3, it is understood that a part of blue light is absorbed and converted into light having a long wavelength by adding quantum dots that are fluorescent materials. On the other hand, when yttrium oxide is used as the light diffusing particles 180 (sample 4), it can be confirmed that blue light is further absorbed. Further, when the wavelength conversion layer 172 containing titanium oxide is used (sample 5), the relative light receiving intensity at 450 nm is greatly reduced, and the light receiving intensity at 650 nm is 2 as compared with the case where the light scattering particles 180 are not present. It was found to increase more than twice. From the above, it was found that by adding the light diffusing particles 180, the short wavelength light is more efficiently absorbed and effectively converted into the long wavelength light. In particular, it has been found that wavelength conversion of light having a short wavelength can be effectively performed by using titanium oxide.

  Table 2 summarizes the influence of the concentration of the fluorescent material and the light diffusing particles 180. These samples 6 to 9 are samples in which a wavelength conversion layer 172 containing a fluorescent material and titanium oxide having the composition shown in Table 2 is formed on alkali-free glass. As an overall trend, it can be seen that short wavelength light is effectively absorbed and converted to long wavelength light as the respective concentrations of the fluorescent material and the light diffusing particle 180 increase. From this table, it can be said that the light conversion can be sufficiently accelerated by adding the light diffusion particles 180 at a concentration of 5.0 wt% to 10 wt%.

[7. Effect of antioxidants]
In order to verify the effect of the antioxidant, samples 10 to 12 in which a wavelength conversion layer 172 containing titanium oxide as a light-scattering particle 180 and a fluorescent material is formed on non-alkali glass, and a color filter 174 is provided thereon. Produced. Sample 10 does not contain an antioxidant in wavelength conversion layer 172, while samples 11 and 12 contain a phosphorous and phenolic antioxidant in wavelength conversion layer 172, respectively. The results are shown in Table 3.

  As understood from Table 3, the addition of an antioxidant to the wavelength conversion layer 172 does not significantly affect the optical characteristics. That is, it was confirmed that the short wavelength light was efficiently converted into the long wavelength light in any case of the samples 10 to 12.

  However, it was confirmed that the antioxidant can suppress a significant decrease in the relative light reception intensity at 650 nm when these samples were subjected to a heat treatment (post-bake) for 20 minutes at 180 ° C. in a clean oven. That is, as shown in FIG. 12, in sample 10, the relative received light intensity at 650 nm after post-baking is greatly reduced to about 20% compared to before post-bake. This is presumably because the quantum dots that are fluorescent materials lack thermal or chemical stability and are partially degraded by post-baking. On the other hand, it can be understood from the results of FIG. 12 that the addition of an antioxidant prevents the deterioration completely but suppresses the degree of the deterioration. 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 liquid crystal display device and an organic EL display device have been described as examples of the display device including the laminates 170 and 184 which are embodiments of the invention. However, the display device is not limited to these. The laminates 170 and 184 can be applied to various display devices. For example, the stacked bodies 170 and 184 may be applied to various display devices such as a display device (MEMS display device) that performs gradation control using a MEMS shutter, a display device (SED) having a surface conduction electron-emitting device, and a plasma display panel. These display devices including the stacked bodies 170 and 184 are also one embodiment of the present invention.

  The embodiments described above as the embodiments of the present invention can be implemented in appropriate combination as long as they do not contradict each other. Based on each embodiment, those in which those skilled in the art appropriately added, deleted, or changed the design of components are also included in the scope of the present invention as long as they have the gist of the present invention.

  Of course, other operational effects that are different from the operational effects provided by the above-described embodiments, which are apparent from the description of the present specification or can be easily predicted by those skilled in the art, are naturally included in the present invention. It is understood that

  DESCRIPTION OF SYMBOLS 100: Display apparatus, 101: Laminated body, 102: Display board | substrate, 104: Pixel, 104b: Pixel, 104g: Pixel, 104r: Pixel, 105: Pixel, 106: Display area, 108: Gate side drive circuit, 110: Source Side drive circuit, 114: terminal, 116: FPC board, 118: board, 120: signal line, 122: scanning line, 124: capacitance line, 126: polarizing plate, 128: polarizing plate, 130: transistor, 132: gate electrode , 134: semiconductor film, 136: source / drain electrode, 138: source / drain electrode, 140: base film, 142: gate insulating film, 144: interlayer insulating film, 145: insulating film, 146: contact hole, 148: first 1 alignment film, 150: capacitor, 151: capacitor electrode, 152: pixel electrode, 153: slit, 154: second alignment film, 156: Counter electrode, 158: planarization film, 160: liquid crystal layer, 162: overcoat, 164: light shielding film, 170: laminate, 172: wavelength conversion layer, 172g: wavelength conversion layer, 172r: wavelength conversion layer, 174: color Filter: 176: Light transmission layer, 178: Light diffusion layer, 180: Light diffusion particle, 182: Fine pore, 184: Laminate, 190: Backlight unit, 200: Signal line, 202: Scan line, 204: Current supply Line 210: Switching transistor 212: Semiconductor film 214: Gate electrode 216: Source / drain electrode 218: Source / drain electrode 220: Capacitance electrode 224: Contact hole 230: Drive transistor 232: Semiconductor film 232a: channel formation region, 232b: doped region, 234: gate electrode, 236: source / drain 238: source / drain electrode, 240: pixel electrode, 242: EL layer, 242a: hole injection / transport layer, 242b: light emitting layer, 242c: electron injection / transport layer, 244: counter electrode, 248: base film 250: capacitance, 252: gate insulating film, 256: planarization film, 258: partition wall, 260: protective film

Claims (18)

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, overlapping the wavelength conversion layer and having an absorption peak in the range of 400 nm to 500 nm. ,
At least one of the wavelength conversion layer and the color filter is a laminate that diffuses light in a wavelength range of 400 nm to 500 nm.   The laminate according to claim 1, wherein the color filter is located between the substrate and the wavelength conversion layer. The wavelength conversion layer for diffusing the light or the color filter includes light diffusing particles containing an inorganic compound or an organic compound,
The inorganic compound is selected from metal oxides, sulfides, sulfates, halides, nitrides, silicates,
The organic compound includes a polymer,
The laminate according to claim 1, wherein the light diffusion particles containing the organic compound are hollow particles.   The laminate according to claim 1, wherein the wavelength conversion layer or the color filter that diffuses the light includes pores containing air.   The laminate according to claim 3, wherein the light diffusion particles are included in the wavelength conversion layer.   The laminate according to claim 4, wherein the pores are included in the wavelength conversion layer.   The laminate according to claim 1, wherein the wavelength conversion layer includes a fluorescent material that absorbs the light and gives an emission peak in a range of 500 nm to 750 nm. Display board,
The pixel on the display substrate, and the laminate according to claim 1 located on the pixel,
The wavelength conversion layer and the color filter are sandwiched between the display substrate and the substrate, and are disposed so as to overlap the pixels. 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 wavelength conversion layer located on the first surface side and overlapping the second region;
A light transmission layer located on the first surface side and overlapping the third region; and the first wavelength conversion located on the first surface side in the first region and the second region. A color filter having an absorption peak in the range of 400 nm to 500 nm, overlapping the layer and the second wavelength conversion layer,
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 are laminated bodies that absorb the light and emit light in different colors.   The laminate according to claim 9, wherein 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 first wavelength conversion layer, the second wavelength conversion layer, or the color filter that diffuses the light includes light diffusion particles including an inorganic compound or an organic compound,
The inorganic compound is selected from metal oxides, sulfides, sulfates, halides, nitrides, silicates,
The organic compound includes a polymer,
The laminate according to claim 9, wherein the light diffusing particles containing the organic compound are hollow particles.   The laminate 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 laminate according to claim 11, wherein the light diffusion particles are included in the first wavelength conversion layer and the second wavelength conversion layer.   The laminate according to claim 12, wherein the pores are included in the first wavelength conversion layer and the second wavelength conversion layer.   The first wavelength conversion layer and the second wavelength conversion layer include a fluorescent material that absorbs the light and gives emission peaks in a range of 500 nm to 600 nm and a range of 650 nm to 750 nm, respectively. Laminated body. Display board,
The first pixel, the second pixel, and the third pixel on the display substrate, and the first pixel, the second pixel, and the third pixel, respectively. Having a laminate,
The first wavelength conversion layer, the second wavelength conversion layer, the light transmission layer, and the color filter are arranged so as to be sandwiched between the display substrate and the substrate,
The display in which the first wavelength conversion layer, the second wavelength conversion layer, and the light transmission layer are arranged so as to overlap with the first pixel, the second pixel, and the third pixel, respectively. apparatus. substrate,
A wavelength conversion layer located on the first surface side of the substrate;
A color filter located on the first surface side of the substrate, overlapping the wavelength conversion layer and having an absorption peak in the range of 400 nm to 500 nm, and located on the first surface side of the substrate, from 400 nm to 500 nm The laminated body provided with the light-diffusion layer which diffuses the light of the wavelength range. 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 wavelength conversion layer located on the first surface side and overlapping the second region;
A light transmissive layer located on the first surface side and overlapping the third region;
Located on the first surface side, overlaps the first wavelength conversion layer and the second wavelength conversion layer in the first region and the second region, and has an absorption peak in the range of 400 nm to 500 nm. A color filter, which 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 is 400 nm Comprising a light diffusing layer for diffusing light in the wavelength range from to 500 nm,
The first wavelength conversion layer and the second wavelength conversion layer are laminated bodies that absorb light in a wavelength range of 400 nm to 500 nm and emit light in different colors.