WO2018230346A1 - Light guide plate and display device - Google Patents

Abstract

This light guide plate has: a light guide member which guides incident light and has a first surface and a second surface on the side opposite the first surface; a polarizer layer positioned in the upper section of the light guide member; and a light diffusion member positioned on the second surface of the light guide member. The light diffusion member includes light-diffusing particles and either a pigment or a fluorescent material.

Description

Light guide plate and display device

The present invention relates to a light guide plate and a display device.

In recent years, there are high demands for improving color reproducibility and high definition of liquid crystal display panels. A high-definition liquid crystal display panel has a problem of improving the light use efficiency because the pixel size is small.

For example, Patent Document 1 discloses a film capable of improving the color purity of a liquid crystal display panel by blocking unnecessary wavelengths other than RGB wavelengths while allowing pure RGB wavelengths emitted from a light source to transmit as much as possible. A liquid crystal display panel is disclosed.

JP 2016-75892 A

High-definition liquid crystal display panels are required to further improve color reproducibility and light utilization efficiency because of the small pixel size.

In view of such a problem, an embodiment of the present invention has an object to provide a light guide plate and a display device that can improve light use efficiency.

A light guide plate according to an embodiment of the present invention includes a light guide member that has a first surface and a second surface opposite to the first surface to guide incident light, and a polarization that is disposed above the light guide member. And a light diffusion member disposed on the second surface of the light guide member, the light diffusion member including light diffusion particles and a dye or a phosphor.

A light guide plate according to an embodiment of the present invention has a first surface and a second surface opposite to the first surface, guides incident light, and is disposed on the first surface of the light guide member. The polarizer layer and a light diffusing member disposed on the second surface of the light guide member, the light diffusing member including light diffusing particles and a dye or phosphor.

The polarizer layer included in the light guide plate according to an embodiment of the present invention may be a layer having a metal pattern.

The polarizer layer included in the light guide plate according to an embodiment of the present invention may include a metal pattern and an insulating layer embedded between the metal patterns.

A plurality of diffusion members included in the light guide plate according to the embodiment of the present invention may be arranged separately in the plane of the second surface.

The light guide plate according to an embodiment of the present invention may further include a light diffusion layer that diffuses light between the polarizer layer and the first surface.

The light diffusion layer of the light guide plate according to an embodiment of the present invention may include either a wavelength conversion member that converts the wavelength of light or a wavelength selection member that selects the wavelength of light.

In the light guide plate according to an embodiment of the present invention, the first surface may be in contact with the polarizer layer.

The light diffusion layer of the light guide plate according to an embodiment of the present invention may have one surface in contact with the first surface and the surface opposite to the one surface in contact with the polarizer layer.

The dye included in the light guide plate according to an embodiment of the present invention may have at least one absorption peak in the visible light band.

The ratio of the dye contained in the light diffusing member included in the light guide plate according to the embodiment of the present invention may be 0.01 × 10 ⁻⁴ parts by mass or more and 10 × 10 ⁻⁴ parts by mass or less.

The phosphor of the light guide plate according to an embodiment of the present invention includes a wavelength conversion member that absorbs blue wavelength light and emits red wavelength light, and absorbs blue wavelength light and emits green wavelength light. It may be at least one of a wavelength converting member that emits light.

The polarizer layer included in the light guide plate according to an embodiment of the present invention has a blue wavelength p-wave reflectance that is relatively higher than a red wavelength reflectance and a green wavelength reflectance. The transmittance of the p-wave of the wavelength may be lower than the transmittance of the red wavelength and the transmittance of the green wavelength.

The plurality of light diffusion members included in the light guide plate according to an embodiment of the present invention may include two or more different pattern shapes.

The plurality of light diffusing members included in the light guide plate according to an embodiment of the present invention have an island-shaped pattern shape, and the island-shaped pattern shape is an island shape as it goes inward from the end of the second surface. The pattern shape may be enlarged.

A display device according to an embodiment of the present invention includes the light guide plate described above, a light source that emits light, and a liquid crystal display panel. The light source is disposed adjacent to an end of the light guide plate, and the liquid crystal display The panel is disposed on the first surface side of the light guide plate.

The display device according to an embodiment of the present invention may further include a light diffusion layer that diffuses light between the polarizer layer and the first surface.

The light diffusion layer of the display device according to an embodiment of the present invention may include either a wavelength conversion member that converts the wavelength of light or a wavelength selection member that selects the wavelength of light.

The display device according to an embodiment of the present invention may further include a reflector that reflects light.

It is typical sectional drawing which shows the structure of the light-guide plate which concerns on one Embodiment of this invention. It is a typical perspective view which shows the structure of the light-guide plate which concerns on one Embodiment of this invention. It is typical sectional drawing which shows the structure of the light-guide plate which concerns on one Embodiment of this invention. It is typical sectional drawing which shows the structure of the light-guide plate which concerns on one Embodiment of this invention. It is typical sectional drawing which shows the structure of the light-guide plate which concerns on one Embodiment of this invention. It is typical sectional drawing which shows the structure of the display apparatus which concerns on one Embodiment of this invention. 1 is a schematic plan view showing a display panel included in a display device according to an embodiment of the present invention. It is a typical top view showing a pixel contained in a display panel which a display concerning one embodiment of the present invention has. It is typical sectional drawing of the display panel which the display apparatus which concerns on one Embodiment of this invention has. It is a figure which shows the result of having simulated the relationship between the transmittance | permeability of the material A and the material B which are dyes used for the light-guide plate which concerns on one Embodiment of this invention, and a wavelength. It is a figure which shows the result of having simulated the relationship between the intensity | strength of the wavelength which permeate | transmits the said member, and the wavelength in the member which combined the light diffusing particle and dye used for the light-guide plate which concerns on one Embodiment of this invention, and a color filter. is there. It is a figure which shows the result of having simulated the relationship between the intensity | strength of the wavelength which permeate | transmits the said member, and the wavelength in the member which combined the light diffusing particle and dye used for the light-guide plate which concerns on one Embodiment of this invention, and a color filter. is there. It is the figure which calculated and plotted the chromaticity coordinate based on the result of the simulation shown to FIG. 11A and FIG. 11B. It is a figure which shows the result of having simulated the relationship between the intensity | strength of the wavelength which permeate | transmits the said light-guide plate, and a wavelength when changing the ratio of the dye mix | blended with the light-diffusion particle | grains used for the light-guide plate which concerns on one Embodiment of this invention. is there. It is the figure which computed and plotted chromaticity coordinates from the result of the simulation shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention can be implemented in many different modes without departing from the scope of the invention. That is, the present invention is not construed as being limited to the description of the embodiments exemplified below. In addition, in order to clarify the description, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part as compared to the actual mode. However, the schematic drawings are merely examples, and do not limit the interpretation of the present invention.

In the present specification and each drawing, the same elements as those described in the previous drawings are denoted by the same reference numerals (or numerals followed by a, b, etc.), and the description will be omitted as appropriate. There is. The letters “first” and “second” attached to each element are convenient signs used to distinguish each element, and have more meanings unless otherwise specified. Absent.

In this specification, “upper” includes not only the case of being placed directly on a certain object or region, but also the case of being placed with another object or region in between. The same applies to the term “below”. In addition, terms such as “upper” and “lower” indicate a relative vertical relationship between objects or regions, and do not mean an absolute vertical relationship. Specifically, the direction away from the main surface of the substrate is defined as “up” with reference to the main surface of the substrate (surface on which elements are formed), and the direction approaching the main surface of the substrate is defined as “down”. Define.

When a single film is processed to form a plurality of patterns, each of the plurality of patterns may have a different function and / or role. However, these plural patterns are derived from films formed as the same layer in the same process. That is, these plural patterns have the same layer structure and include the same material. Therefore, in this specification, it is defined that these plural patterns exist in the same layer.

(First embodiment)
In the present embodiment, a configuration and a manufacturing method of a light guide plate according to an embodiment of the present invention will be described.

1. Configuration FIG. 1 is a schematic cross-sectional view showing a configuration of a light guide plate 400 in the first embodiment.

1 includes a light diffusing member 170, a light guide member 10, a light diffusing layer 11, a light guide plate 400 including a reflective polarizing layer 60, a light source 12, and a reflecting plate 13. The light diffusing member 170 includes light diffusing particles (A), a colorant (B), and a phosphor. The reflective polarizing layer 60 includes a metal pattern and an insulating member 62. The metal pattern is, for example, a wire grid 61. In the present specification, a configuration using a wire grid 61 as an example of a metal pattern will be described. The light diffusing member 170 may include, for example, light diffusing particles and a phosphor 174, may include light diffusing particles and a dye, or may include only light diffusing particles. By reducing the number of members included in the light diffusing member 170, a light guide plate with reduced manufacturing costs can be provided.

1.1. Light diffusing particles (A)
The light diffusing particles (A) can be converted into light 170 </ b> A that radially diffuses the incident light 12 </ b> A from the light source that has passed through the light guide member 10. That is, the light diffusing member 170 can diffuse the incident light 12A from the light source in all directions around the light diffusing member 170. Since the light diffusion member 170 can diffuse light, the light diffusion member 170 on the light guide member 10 is arranged in a pattern with a space between the light diffusion member 170 and the light diffusion member 170. Is preferred. By disposing the light diffusing member 170 and the light diffusing member 170 at an interval, the light reflected by the reflecting plate 13 of the adjacent light diffusing member 170 and the light reflected by the reflective polarizing layer 60 are easily transmitted.

Inorganic particles and organic particles can be used as the light diffusing particles (A). As inorganic particles, calcium carbonate particles, barium sulfate particles, titanium dioxide particles and the like can be preferably used. As the organic particles, core-shell type organic particles, hollow organic particles, and irregular organic particles having a non-spherical shape are preferable. The light diffusion particles (A) used in the present embodiment can be used alone or in combination of two or more.

The average particle diameter D (cumulative 50% particle diameter D50) of such light diffusing particles (A) is preferably 200 nm to 1000 nm, and more preferably 300 nm to 500 nm. Inorganic particles having an average particle diameter D within the above range can be obtained by appropriately selecting from commercially available products based on the particle size distribution. In addition, core-shell particles, organic particles, irregularly shaped particles, and the like can be prepared by the methods described in International Publication No. 2005/071014 and JP2013-93205A, and thus description thereof is omitted.

The absolute value | Δn | of the difference in refractive index between the light diffusing particles (A) and the photopolymerizable component (D) described later after polymerization is preferably 0.02 ≦ | Δn | ≦ 1.3. For example, when a photopolymerizable monomer or photopolymerizable oligomer having no hydroxyl group is used as the photopolymerizable component (D), calcium carbonate particles (refractive index: n = 1.59) are used as the light diffusing particles (A). ), At least one of barium sulfate particles (refractive index: n = 1.64) and titanium dioxide particles (refractive index: n = 2.7), the above conditions are satisfied.

In 100 parts by mass of the light diffusing member, the content of the light diffusing particles (A) is preferably 0.5 to 30 parts by mass. The content ratio of the light diffusing particles (A) in the light diffusing member is preferably 0.5% by mass to 30% by mass based on the total mass of the light diffusing member.

1.2. Colorant (B)
The colorant (B) can absorb light of a predetermined wavelength from the incident light 12A from the light source that has passed through the light guide member 10 and transmit light of other wavelengths. That is, the colorant (B) has a wavelength selection role capable of selectively absorbing and transmitting a predetermined wavelength. Therefore, the light guide plate 400 having the colorant (B) can selectively absorb, for example, a wavelength exhibiting red light and transmit light other than the wavelength exhibiting red light, thereby expanding the color gamut. it can.

The light diffusion member according to the present embodiment can contain a colorant (B). The colorant (B) is preferably a bluing agent. The “blueing agent” in the present invention is a component that adjusts the hue by absorbing light in a wavelength region such as orange to yellow in the visible light region.

When the light guide member is a resin substrate, the resin substrate tends to absorb light in the blue wavelength range among the light emitted from the light source. For this reason, the light intensity | strength of the blue wavelength region reduces more for the light which guided the inside of the light guide member longer. As a result, in the light diffusing member away from the light source, the light that has passed through the light guide member for a longer time reaches, and therefore, yellowish light tends to be emitted. Therefore, by using a light diffusing member containing a colorant such as a bluing agent, such a change in color tone can be offset.

As the bluing agent, dyes and pigments are preferable. For example, inorganic dyes and pigments such as ultramarine, bitumen and cobalt blue, phthalocyanine bluing agents, condensed polycyclic bluing agents (for example, indigo bluing agents). Organic dyes and pigments such as anthraquinone-based bluing agents). Among these, a condensed polycyclic bluing agent is preferable, and an anthraquinone bluing agent is more preferable.

As the anthraquinone-based bluing agent, a bluing agent containing an anthraquinone ring represented by the following formula (1) or a compound represented by the following formula (2) can be used.

Such anthraquinone-based bluing agents are also available as commercial products, for example, Plast Blue 8510, Plast Blue 8514, Plast Blue 8516, Plast Blue 8520, Plast Blue 8540, Plast Blue 8580, Plast Blue 8590 or more All manufactured by Arimoto Chemical Industry Co., Ltd.), Macrolex Violet B, Macrolex Violet 3R, Macrolex Blue RR (all manufactured by Bayer), Dial Resin Blue B, Dial Resin Violet D, Dial Resin Blue J, Dial Resin Blue N, Dialresin Blue G (all from Mitsubishi Chemical), Sumiplast Violet B (Sumitomo Chemical), Tetrazole Blue RL (Manufactured by Sandoz), and the like. The colorant (B) used in the present embodiment can be used alone or in combination of two or more.

Among these commercially available bluing agents, Plast Blue 8510, Plast Blue 8514, Plast Blue 8516, Plast Blue 8520, Plast Blue 8540, Plast Blue 8580, and Plast Blue 8590 are particularly preferred, and Plast 14590 is preferred.

The content ratio of the colorant (B) in the light diffusing member according to this embodiment is 0.01 × 10 ⁻⁴ parts by mass to 10 × 10 ⁻⁴ parts by mass with respect to 100 parts by mass of the light diffusing particles (A). It is preferably 0.1 × 10 ⁻⁴ parts by mass to 1 × 10 ⁻⁴ parts by mass. The adhesiveness of the light-diffusion member which concerns on this embodiment can be improved as content of a coloring agent (B) is the said range.

1.3. Other components The light-diffusion member which concerns on this embodiment may contain components other than the above-mentioned light-diffusion particle (A) and a coloring agent (B). For example, the viscosity and photocurability of the light diffusing member can be controlled by using phosphate ester (C), photopolymerizable component (D), photopolymerization initiator, aliphatic urethane (meth) acrylate, and the like. . Moreover, the surface tension of the light diffusing member and the wettability to the light guide member can be controlled by using a surfactant such as silicon and fluorine. Furthermore, by using a binder described in International Publication No. 2005/071014 or JP2013-93205A, a light diffusing member with improved mechanical strength such as adhesion can be produced.

1.3.1. Phosphate ester (C)
When the light guide member is a glass substrate, the light diffusing member according to this embodiment preferably contains a phosphate ester (C). The phosphate ester (C) preferably has a polymerizable functional group, and the polymerizable functional group may be radically polymerizable or cationically polymerizable. Such phosphate ester (C) is preferably a phosphate ester represented by the following general formula (3). In addition, when phosphate ester (C) is radically polymerizable, in this invention, phosphate ester (C) and the photopolymerizable component (D) mentioned later are handled as a different component.

（式（３）中、Ｒ１は水素原子又はメチル基、Ｒ２は２価の有機基、ｎは１又は２の整数を示す。）

(In formula (3), R1 represents a hydrogen atom or a methyl group, R2 represents a divalent organic group, and n represents an integer of 1 or 2.)

Phosphoric acid ester (C) is suitably used for improving the balance between hardness, scratch resistance, wear resistance and low curling property when the light diffusion member is a cured coating film. In the general formula (1), R2 is a divalent organic group, preferably a divalent hydrocarbon group, and preferably a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms. .

Examples of the phosphate ester (C) used in the present embodiment include mono- or bis (2- (meth) acryloyloxyethyl) acid phosphate, mono- or bis (2- (meth) acryloyloxypropyl) acid phosphate. Mono- or bis (3- (meth) acryloyloxypropyl) acid phosphate, mono- or bis (6- (meth) acryloyloxyhexyl) acid phosphate, mono- or bis (10- (meth) acryloyloxydecyl) acid phosphate Fate, mono- or bis (1-chloromethyl-2- (meth) acryloyloxyethyl) acid phosphate, 2-methacryloyloxyethyl phenyl acid phosphate, etc., and lactone-modified products, polyoxyalkylene-modified products, etc. It can gel. Of these, mono- or bis (2- (meth) acryloyloxyethyl) acid phosphate is preferable from the viewpoint of obtaining a cured product having high hardness. The phosphate ester (C) used in the present embodiment can be used singly or in combination of two or more.

Examples of the phosphate ester (C) include Kyoeisha Chemical Co., Ltd. trade names: Light Ester P-1M, P-2M, Nippon Kayaku Co., Ltd. trade names: KAYAMER PM-2, PM-21, etc. Can be used.

In 100 parts by mass of the light diffusing member, the content Mc of the phosphate ester (C) is preferably 0.07 parts by mass to 5 parts by mass, and more preferably 0.2 parts by mass to 2 parts by mass. . The content ratio of the phosphoric acid ester (C) in the light diffusing member is preferably 0.07% by mass to 5% by mass based on the total mass of the light diffusing member, and 0.2% by mass to 2% by mass. It is more preferable that When the content of the phosphate ester (C) is in the above range, the adhesion of the light diffusing member according to this embodiment can be improved.

1.3.2. Photopolymerizable component (D)
When using a photocurable light diffusing member, the photopolymerizable component (D) is preferably radically polymerizable, and more preferably has a photopolymerizable functional group such as a vinyl group. As the photopolymerizable component (D), for example, a photopolymerizable monomer or a photosensitive polymer can be used. As specific examples of such a photopolymerizable component (D), for example, compounds described in International Publication No. 2005/071014 and JP-A-2013-93205 can be used in a timely manner.

Examples of the photopolymerizable monomer that can be used include vinyl aromatic compounds, unsaturated nitriles, (meth) acrylic acid esters, unsaturated carboxylic acid esters, and unsaturated amides.

Examples of vinyl aromatic compounds include styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, p-tert-butylstyrene, divinylbenzene, diisopropenylbenzene, o-chlorostyrene, m -Use chlorostyrene, p-chlorostyrene, 1,1-diphenylethylene, p-methoxystyrene, N, N-dimethyl-p-aminostyrene, N, N-diethyl-p-aminostyrene, vinylpyridine, etc. Can do.

Unsaturated nitriles include (meth) acrylonitrile, α-chloroacrylonitrile, α-chloromethylacrylonitrile, α-methoxyacrylonitrile, α-ethoxyacrylonitrile, crotonic acid nitrile, cinnamic acid nitrile, itaconic acid dinitrile, maleic acid dinitrile, fumarate Acid dinitrile and the like can be used.

(Meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec -Butyl (meth) acrylate, tert-butyl (meth) acrylate, n-amyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) (Meth) acrylic acid esters such as acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2- (n-propoxy) ethyl (meth) acrylate; 2-hydroxyethyl (meth) acrylate Hydroxyl group-containing (meth) acrylic acid esters such as 2-hydroxypropyl (meth) acrylate and 3-hydroxypropyl (meth) acrylate; (meth) acrylic acid monoesters of polyalkylene glycols such as polyethylene glycol and polypropylene glycol; cyanoethyl Cyano group-containing (meth) acrylic acid esters such as (meth) acrylate and cyanopropyl (meth) acrylate; 2-phenoxyethyl (meth) acrylate, 2-phenoxypropyl (meth) acrylate, 3-phenoxypropyl (meth) acrylate (Meth) acrylic acid aryloxyalkyl esters such as methoxypolyethylene glycol, ethoxypolyethylene glycol, methoxypolypropylene glycol, ethoxypolypropylene (Meth) acrylic acid monoesters of alkoxypolyalkylene glycol such as recall; (meth) acrylic acid monoesters of aryloxypolyalkylene glycol such as phenoxypolyethylene glycol and phenoxypolypropylene glycol; ethylene glycol, propylene glycol, 1,4 -(Meth) acrylic acid diesters of alkylene glycols such as butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol; polyalkylene glycols such as polyethylene glycol and polypropylene glycol (the number of alkylene glycol units is, for example, 2 to 23) (meth) acrylic acid diester, both-end hydroxypolybutadiene, both-end hydroxypolyisoprene, both-end hydroxybutyl (Meth) acrylic acid diesters of polymers having hydroxyl groups at both ends such as tadiene-acrylonitrile copolymer and hydroxypolycaprolactone at both ends; glycerin, 1,2,4-butanetriol, trimethylolalkane (the carbon number of alkane is For example, 1-3), tetramethylolalkane (alkane has 1 to 3 carbon atoms, for example), (meth) acrylic acid diester, (meth) acrylic acid triester or (meth) acrylic diester of trihydric or higher polyhydric alcohol such as pentaerythritol ) (Meth) acrylic acid oligoesters such as acrylic acid tetraesters; (meth) acrylic acid esters such as (meth) acrylic acid triesters or (meth) acrylic acid tetraesters of polyalkylene glycol adducts of trihydric or higher polyhydric alcohols Acid oligoesters; etc. Kill.

As unsaturated carboxylic acid esters, unsaturated carboxylic acid esters such as methyl crotonate, ethyl crotonate, propyl crotonate, butyl crotonate, methyl cinnamate, ethyl cinnamate, propyl cinnamate and butyl cinnamate Etc. can be used.

Examples of unsaturated amides include (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, N, N-bis (2-hydroxyethyl) (meth) acrylamide, N Unsaturated amides such as N, N'-methylenebis (meth) acrylamide, N, N'-ethylenebis (meth) acrylamide, N, N'-hexamethylenebis (meth) acrylamide, crotonic acid amide, cinnamic acid amide, etc. Can be used.

As the photopolymerizable polymer, a known polymer can be used without particular limitation as long as a photopolymerizable group is introduced into the polymer skeleton, but a radical polymerizable polymer is preferable. Examples of the polymer skeleton of such a photopolymerizable polymer include a polyethylene skeleton, a polyurethane skeleton, a polyester skeleton, a polyamide skeleton, a polyimide skeleton, a polyoxyalkylene skeleton, and a polyphenylene skeleton, and preferably a polyethylene skeleton and a polyurethane skeleton. It is. Examples of the photopolymerizable group include (meth) acryloyl group, alkenyl group, cinnamoyl group, cinnamylideneacetyl group, benzalacetophenone group, styrylpyridine group, α-phenylmaleimide, phenylazide group, sulfonylazide group, carbonylazide Group, diazo group, o-quinonediazide group, furylacryloyl group, coumarin group, pyrone group, anthracene group, benzophenone group, benzoin group, stilbene group, dithiocarbamate group, xanthate group, 1,2,3-thiadiazole group, cyclopropene Group, azadioxabicyclo group, and the like. Preferred photopolymerizable groups are (meth) acryloyl group and cinnamoyl group, and particularly preferred is (meth) acryloyl group.

When the light diffusing member contains the photopolymerizable component (D), the content Md of the photopolymerizable component (D) is preferably 50 parts by mass to 95 parts by mass in 100 parts by mass of the light diffusing member. More preferably, it is 65 to 80 parts by mass. The content of the photopolymerizable component (D) in the light diffusing member is preferably 50% by mass to 95% by mass and 65% by mass to 80% by mass based on the total mass of the light diffusing member. It is more preferable. When the content ratio of the photopolymerizable component (D) is within the above range, the light diffusing particles (A) contained in the light diffusing member according to this embodiment can be held with sufficient strength, and light diffusion is performed in the manufacturing process. Generation | occurence | production of a foreign material, such as particle | grains (A) peeling, can be suppressed effectively.

When the light diffusing member contains a photopolymerizable component (D), the content of the phosphate ester (C) is Mc (parts by mass), and the content of the photopolymerizable component (D) is Md (parts by mass). In this case, it is preferable to satisfy the relationship Mc / (Mc + Md) = 0.001 to 0.1, more preferably Mc / (Mc + Md) = 0.001 to 0.06, and Mc / (Mc + Md ) = 0.005 to 0.06 is particularly preferable. When the value of Mc / (Mc + Md) is in the above range, the light extraction efficiency of the light diffusing member according to this embodiment can be improved.

1.3.3. Photopolymerization initiator When a photocurable light diffusion member is used, it is preferable to contain a photopolymerization initiator. Such a photopolymerization initiator can be appropriately selected from those usually used in the field of ultraviolet curable resins. As the photopolymerization initiator, compounds described in International Publication Nos. 2005/071014 and JP2013-93205A can be used as appropriate.

Examples of photopolymerization initiators include α-diketone compounds such as diacetyl, methylbenzoylformate, and benzyl; acyloins such as benzoin and pivaloin; acyloins such as benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin isobutyl ether Ethers; polynuclear quinones such as anthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 1,4-naphthoquinone; acetophenone, 2-hydroxy-2-methyl-propiophenone, 1-hydroxycyclohexyl phenyl ketone, 2 Acetophenones such as 1,2-dimethoxyphenylacetophenone, 2,2-diethoxyacetophenone, trichloroacetophenone; benzophenone, methyl-o-ben Yl benzoate, benzophenones such as Michler's ketone; xanthone, thioxanthone, xanthone such as 2-chlorothioxanthone and the like.

When the light diffusion member contains a photopolymerization initiator, the content of the photopolymerization initiator in 100 parts by mass of the light diffusion member is preferably 0.1 parts by mass to 20 parts by mass, and 0.5 parts by mass More preferably, it is 10 parts by mass. The content of the photopolymerization initiator in the light diffusing member is preferably 0.1% by mass to 20% by mass, and more preferably 0.5% by mass to 10% by mass.

1.3.4. Other components It is preferable that the light-diffusion member which concerns on this embodiment contains a hydroquinone derivative. Examples of hydroquinone derivatives include hydroquinone, hydroquinone monomethyl ether, mono-tert-butylhydroquinone, catechol, p-tert-butylcatechol, p-methoxyphenol, p-tert-butylcatechol, 2,5-di-tert-butylhydroquinone. , Hydroxy aromatic compounds such as 2,6-di-tert-butyl-m-cresol, pyrogallol, β-naphthol, benzoquinone, 2,5-diphenyl-p-benzoquinone, p-toluquinone, p-xyloquinone, etc. It is preferable.

When the light diffusing member contains a hydroquinone derivative, the content of the hydroquinone derivative in 100 parts by weight of the light diffusing member is preferably 0.001 part by weight to 2 parts by weight, and 0.01 part by weight to 1 part by weight. It is more preferable that The content of the hydroquinone derivative in the light diffusing member is preferably 0.001% by mass to 2% by mass, and preferably 0.01% by mass to 1% by mass based on the total mass of the light diffusing member. Is more preferable. When the content of the hydroquinone derivative is within the above range, the whiteness of the light diffusing member according to this embodiment can be further improved. Hydroquinone derivatives are generally known as storage stabilizers (polymerization inhibitors). However, in the case of nitrosamine metal salts such as N-nitrosophenylhydroxylamine aluminum salt generally used as the same storage stabilizer, it is sometimes difficult to improve the whiteness because the light diffusing member is yellowed. is there.

1.4. Phosphor The phosphor 174 can convert light having a wavelength exhibiting a predetermined color into light having a wavelength exhibiting another color from the incident light 12 </ b> A from the light source that has passed through the light guide member 10. That is, the phosphor 174 has a role of wavelength conversion. Therefore, the light guide plate 400 having the phosphor 174 can convert, for example, the wavelength of light exhibiting blue into the wavelength of light exhibiting green or red, and can expand the color gamut with less energy loss.

The phosphor used in the present invention is a combination of at least one phosphor having a main absorption wavelength band other than RGB and a main emission wavelength band corresponding to RGB. Also good.

For example, the phosphor used in the present invention has a main absorption wavelength band of 430 nm or less (for example, 380 nm to 430 nm), 480 nm to 510 nm, or 560 nm to 600 nm as a wavelength band other than RGB, and a wavelength corresponding to RGB. The band may have a main emission wavelength band of 430 nm to 480 nm, 510 nm to 580 nm, or 600 nm or more (for example, 600 nm to 650 nm), and at least one of these phosphors can be used in combination.

Specific examples of the phosphor include anthracene series, anthraquinone series, arylmethine series, azo series, azomethine series, bimane series, coumarins (coumarins). coumarin system, 1,5-diazabicyclo [3.3.0] octadiene system, diketopyrrole system, naphthalenol-imine system, 1,5-diazabicyclo [3.3.0] octadiene system, diketopyrrole system, naphthalenol-imine , Naphthalimide, perylene, phenolphthalein, pyrrole Pyrroline system, pyran system, pyrene system, porphycene system, porphyrin system, quinacridone system, rhodamine and rubrine system Examples thereof include stilbene phosphors.

Preferably, two or more kinds of phosphors selected from the group consisting of perylene-based, azo-based, pyrrolemethine-based, pyran-based and coumarin-based phosphors. Combinations can be used, more preferably a combination of perylene, pyrrolemethine, pyran and coumarin phosphors.

1.5. Light Guide Member The light guide member 10 has a substantially rectangular parallelepiped shape, and has an exit surface S1, an exit surface S2 opposite to the exit surface S1, and four end surfaces S31 to S34 intersecting the exit surface S1 and the exit surface S2. And have. In the present embodiment, the four end surfaces S31 to S34 are substantially orthogonal to the exit surface S1 and the exit surface S2. The light guide member 10 has a role of guiding light from the light source 12 upward. Here, although S1 and S2 are exit surfaces, they also serve as entrance surfaces and / or reflection surfaces.

Generally, in an edge light type optical system, when light is generated from a light source, heat is generated, and accordingly, the temperature of the light guide member also increases. Therefore, when a resin plate is used as the light guide member, the dimensional change due to heat of the light guide member is larger than the dimensional change of the display panel because the thermal expansion coefficient of the resin plate is high. However, due to the narrow frame of the display panel, it is difficult to correct the dimensional change of the light guide member at the frame portion of the display panel. For this reason, the material of the light guide member may be a resin plate having a small dimensional change due to heat, but is preferably a glass substrate. When the light guide member is a glass substrate, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 350 nm to 750 nm is preferably 50% or more.

The thermal expansion coefficient of the light guide member is preferably 120 × 10 ⁻⁷ / ° C. or less. When the thermal expansion coefficient exceeds the above range, the difference in dimensional change due to heat between the display panel and the light guide member tends to increase. The strain point of the light guide member is preferably 550 ° C. or higher. When the strain point is less than the above range, the heat resistance of the light guide member tends to be lowered. For example, when a reflective film or a diffusion film is formed on the surface of the light guide member at a high temperature, the light guide member is easily thermally deformed. Here, the “strain point” can be measured based on JIS R3103.

1.6. Light Diffusing Layer The light diffusing layer 11 has a resin including a member that diffuses light. The light diffusion layer 11 has a role of diffusing light from the light guide member 10. Therefore, the light diffusion layer 11 can be a more uniform surface light source.

1.7. Reflective Polarizing Layer The reflective polarizing layer 60 including the wire grid 61 and the insulating member 62 reflects the S wave and transmits the P wave in the incident light. The light transmitted through the reflective polarizing layer 60 is the outgoing light 64 of the optical system 200. A plurality of wire grids 61 are arranged on the reflective polarizing layer 60 in parallel with a direction extending in one direction at regular intervals. An insulating member 62 is filled between each of the plurality of wire grids 61 arranged on the reflective polarizing layer 60. The transmittance and reflectance of the reflective polarizing layer 60 may be wavelength-dependent. For example, blue light may have low transmittance and high reflectance with respect to green light and red light. The light reflected by the reflective polarizing layer 60 passes through the light diffusing layer 11, the light guide member 10, and the light diffusing member 170 and is reflected by the reflecting plate 13, whereby the light is recycled. That is, the use efficiency of light can be improved by using the light guide plate 400 having the reflective polarizing layer 60.

The wire grid 61 is a thin line having a line width equal to or shorter than the shortest wavelength of transmitted light to be used. A plurality of wire grids 61 are arranged in parallel with the extending direction, and are formed on the transparent substrate using a conductive material. It is preferable that the intervals at which the wire grids 61 are arranged are periodic. The intervals at which the wire grids 61 are arranged may be aperiodic. For example, when the light shielding layer is formed on the same plane as the plurality of wire grids 61, the line widths of the thin line and the light shielding layer may be different, and thus become aperiodic.

It is well known that the performance of a wire grid is represented by the relationship between the spacing of the wire grid, the wavelength of incident light, the angle of incident light (incident angle), and the refractive index of the substrate. If the interval at which the wire grids 61 are arranged is equal to or shorter than the shortest wavelength of transmitted light to be used, the reflective polarizing layer 60 can transmit p-polarized light and reflect s-polarized light. Specifically, when the range of transmitted light used is a visible light wavelength of 400 nm to 700 nm, the shortest wavelength of transmitted light used is 400 nm. For example, the interval is 360 nm or less and the line width is 180 nm or less. And it is sufficient. The line width is preferably 1/2 or less of the interval. When the line width is about ½ or less of the interval, the reflective polarizing layer 60 reflects almost the electric field component that oscillates parallel to the wire grid 61 with respect to the incident light, and the electric field component that oscillates perpendicularly. Transparent. Therefore, by adjusting the line width and interval of the wire grid 61 included in the reflective polarizing layer, it is possible to provide a reflective polarizing layer that selectively extracts light of a specific wavelength. Further, it is possible to provide a reflective polarizing layer that extracts either one of the S wave and the P wave. It is assumed that the P wave is a component of light whose electric field vibrates vertically in the incident plane, and the S wave is a component of light whose electric field vibrates in parallel with the incident plane.

The performance of the wire grid is also related to the film thickness of the wire grid. For example, the film thickness of the wire grid may be such that the light transmittance is 1% or less. For example, the film thickness of the wire grid is preferably 30 nm or more. Specifically, when the range of transmitted light in which the wire grid 61 is used is a wavelength of visible light of 400 nm to 700 nm, the shortest wavelength of transmitted light to be used is 400 nm. For example, the interval between the wire grids is 360 nm. The film thickness of the wire grid may be 360 nm. If the film thickness of the wire grid is too thin, the transmitted light cannot be ignored and light of a specific wavelength cannot be selectively extracted. On the other hand, if the film thickness of the wire grid is too thick, the light utilization efficiency may decrease, and transmitted light cannot be ignored. Therefore, the film thickness is preferably ½ or less of the interval, as with the line width. The performance of the wire grid is also related to the refractive index between the grids of the wire grid. By filling a transparent dielectric such as resin between the grids, the wavelength dependence of transmittance and reflectance (for example, blue has a low transmittance and a high reflectance with respect to green and red) can be imparted. I can do it.

The material for forming the wire grid 61 is preferably a conductive metal. Further, it is preferable that the material forming the wire grid 61 has a high reflectance with respect to the transmitted light to be used and a high adhesion to the insulating member 62. Examples thereof include, but are not limited to, conductive metal materials such as aluminum, silver, platinum, etc., or alloys thereof.

1, the cross-sectional shape of the wire grid 61 is a rectangle, but is not limited to a rectangle. The cross-sectional shape of the wire grid 61 may be a square, a trapezoid, a triangle, or various shapes can be adopted without departing from the gist of the present invention. it can.

1.8. Light source The light source 12 can be a light source that emits blue light. Specifically, a blue light emitting diode (LED) can be used. The light source 12 may be a light source that emits white light. Specifically, a white light emitting diode (LED) may be used. In FIG. 1, although the light source 12 has shown the example arrange | positioned at S1 surface (right end surface toward the paper surface) of the light guide member 10, arrangement | positioning of the light source 12 is not limited to this example. For example, the light source 12 may be disposed on the S2 surface (the left end surface toward the paper surface). A plurality of light sources 12 may be provided. By providing a plurality of light sources 12, the amount of light incident on the light guide plate 400 can be increased, so that the light guide plate 400 can emit stronger light.

1.9. Reflector The reflector 13 has a role of reflecting light from the light source 12, light reflected by the reflective polarizing layer 60, light diffused by the light diffusion member 170, and external light.

FIG. 2 is a schematic perspective view showing the configuration of the light guide plate 400 in the first embodiment. Since each layer, each member, and components included in the light guide plate 400 have been described with reference to FIG. In FIG. 2, the light diffusing member 170 and the light diffusing member 170 are arranged in a pattern with a space therebetween, and the pattern size of the light diffusing member 170 is increased from the side closer to the light source 12. Is shown. The farther from the light source 12, the light from the light source 12 becomes difficult to reach and the intensity of the light may be weakened. Therefore, by increasing the pattern size of the light diffusing member 170, the area where the light is diffused can be increased. It is possible. The arrangement of the light diffusing member 170 and the pattern shape are not limited to the example shown in FIG. For example, the arrangement of the light diffusing members 170 may not be regular, and the pattern shape of the light diffusing members 170 may be a triangle or a quadrangle. The present invention may be selected as appropriate without departing from the scope of the present invention.

As described above, the light guide plate 400 according to an embodiment of the present invention includes the light guide member 10, the reflective polarizing layer 60, and a plurality of patterned light diffusion members 170. The light guide member 10 has an end surface, an upper surface, and a lower surface. The reflective polarizing layer 60 is disposed on the upper surface of the light guide member 10, and a plurality of the reflective polarizing layers 60 are arranged in parallel with the direction in which the wire grid 61 having a width equal to or less than the blue wavelength of the light incident from the end surface of the light guide member 10 extends. Wire grid 61 and insulating member 62 filling between the plurality of wire grids 61. The plurality of patterned light diffusion members 170 includes at least one of a dye and a phosphor. Since the light guide plate according to an embodiment of the present invention having such a configuration can select and / or convert the wavelength of predetermined light out of incident light, the color gamut can be expanded. Further, since the selected and / or converted predetermined light, incident light, and diffused light are reflected and the light can be recycled, the light use efficiency can be improved.

2. Manufacturing method 2.1. Light diffusing particles (A)
A reaction vessel having a capacity of 2 liters was charged with 109.5 parts of water, 0.2 parts of sodium dodecylbenzenesulfonate (trade name: F65, manufactured by Kao Corporation) and 0.5 parts of sodium persulfate. On the other hand, 90 parts of methyl methacrylate, 10 parts of methacrylic acid, 2.5 parts of octyl thioglycol as a molecular weight regulator, 0.1 part of an emulsifier (trade name: F65, manufactured by Kao Corporation) and 40 parts of water are mixed and stirred. An aqueous dispersion of the monomer mixture was prepared. 20% of the aqueous dispersion of the monomer mixture is charged into the reaction vessel, and the temperature in the reaction vessel is raised to 75 ° C. while stirring the liquid in the reaction vessel to conduct a polymerization reaction for 1 hour, and then the temperature is raised to 75 ° C. The aqueous dispersion of the remaining monomer mixture was continuously added to the reaction vessel over 2 hours while maintaining, and further aged for 2 hours to obtain an aqueous dispersion of seed particles having a solid content of 40% and a particle diameter of 0.2 μm. Got the body.

186 parts of water was charged into a reaction vessel having a capacity of 2 liters, and 25 parts of the above-mentioned aqueous dispersion of seed particles and 0.5 parts of sodium persulfate were added thereto. Meanwhile, 79.5 parts of methyl methacrylate, 20 parts of methacrylic acid, 0.5 part of divinylbenzene (purity 81%), 3 parts of octylthioglycol, emulsifier (trade name: F65, manufactured by Kao Corporation) An aqueous dispersion of a monomer mixture was prepared by mixing and stirring 1 part and 40 parts of water. Next, the temperature in the reaction vessel was increased to 80 ° C. while stirring, and the aqueous dispersion of the monomer mixture was continuously charged into the reaction vessel over 3 hours. Thereafter, the mixture was further aged for 2 hours to obtain an aqueous dispersion of first polymer particles having a solid content of 31% and a particle size of 0.41 μm.

Into a reaction vessel having a capacity of 2 liters, 240 parts of water was charged, 48.4 parts of the above aqueous dispersion of the first polymer particles, 20 parts of styrene, and 0.4 part of sodium persulfate were charged. While the liquid was stirred, the temperature was raised to 80 ° C. and maintained, and styrene was polymerized in 30 minutes to obtain polymer particles in which styrene was combined with the first polymer particles. Meanwhile, 56.5 parts of styrene, 3 parts of ethylene glycol dimethacrylate, 0.1 part of an emulsifier (trade name: F65, manufactured by Kao Corporation), and 40 parts of water are mixed and stirred to form a second polymerizable monomer. An aqueous dispersion was prepared, and the liquid in the reaction vessel was kept at 80 ° C. with stirring, and the aqueous dispersion of the second polymerizable monomer was continuously charged into the reaction vessel over 4 hours. At this time, when 2 hours had elapsed after the start of the addition of the aqueous dispersion of the second polymerizable monomer, 0.5 part of acrylic acid was charged all at once into the reaction vessel and copolymerized with styrene. Further, after all of the aqueous dispersion of the second polymerizable monomer was charged into the reaction vessel, 20 parts of divinylbenzene (purity 81%) were charged at once, and styrene and acrylic acid were applied to the surface layer of the first polymer particles. Then, core-shell polymer particles obtained by polymerizing and laminating ethylene glycol dimethacrylate and divinylbenzene were obtained. Approximately 15 minutes after completion of the addition of all the second polymerizable monomers, 5 parts of a 20% aqueous ammonia solution were added all at once while continuing stirring, the temperature was raised to 90 ° C., and the mixture was aged and stirred for 2 hours. Thereafter, 0.3 part of t-butyl hydroperoxide and 0.1 part of formaldehyde resin were added, and the mixture was allowed to stand for 1 hour to prepare an aqueous dispersion.

The obtained aqueous dispersion was dried using a spray dryer (Pilot Series L-12 type) manufactured by Okawara Kako Co., Ltd. and light diffusion with a particle diameter of 1.1 μm, an inner diameter of 0.9 μm and a volume porosity of 55%. Particles (A) were obtained.

2.2. Light Guide Plate A method for manufacturing the light guide plate 400 will be briefly described. In addition, the manufacturing method is not limited to the content described here, The method normally used in the technical field of this invention is employable.

Here, a method for manufacturing the light guide plate 400 using, for example, an electron beam drawing apparatus, photolithography, or screen printing will be described.

The light diffusion layer 11 is formed on the upper surface (S1) of the light guide member 10. The light diffusion layer 11 is formed by applying a first insulating member in which titanium dioxide particles, calcium carbonate particles, and barium sulfate particles are added to a polyimide-based or acrylic-based resin. Incident light can be diffused by adding titanium dioxide particles, calcium carbonate particles, and barium sulfate particles to a polyimide or acrylic resin. The coating method may be a spin coating method or a dipping method. As the light guide member 10, for example, an acrylic plate can be used. Further, the upper surface of the acrylic plate may be formed with a concavo-convex pattern or a dot pattern in advance by laser, printing and mold. By forming a concavo-convex or dot pattern on the upper surface of the light guide member 10, light incident on the light guide member 10 from the light source 12 disposed in the vicinity of the end surface of the light guide member 10 is guided. Radiation can be performed from the upper surface of the member 10.

Subsequently, a second insulating member made of polyimide or acrylic resin is applied so as to be in contact with the light diffusion layer 11. Alternatively, an inorganic compound such as silicon oxide, silicon nitride oxide, silicon oxynitride, or silicon nitride may be formed. The coating method may be a spin coating method or a dipping method. The film may be formed chemically using a CVD apparatus or the like, or physically formed using a vacuum deposition method, a sputtering method, an ion plating method, or the like. Note that the second insulating member is not necessarily formed. Since the upper surface of the light guide member 10 can be flattened by forming the second insulating member on the light guide member 10, the wire grid 61 can be uniformly formed on the flat surface. Accordingly, light can be uniformly incident, emitted, and diffused.

Next, the reflective polarizing layer 60 is formed. First, a conductive metal for forming the wire grid 61 is formed. For example, aluminum is formed using a sputtering apparatus. Further, a photoresist is applied, and portions other than the pattern of the wire grid 61 are drawn and developed by electron beam drawing. Since the photoresist remains on the pattern of the wire grid 61, the wire grid 61 can be formed by performing etching using the photoresist as a mask and removing the photoresist.

Subsequently, a polyimide or acrylic resin to be the insulating member 62 is applied. The insulating member 62 is a third insulating member. Alternatively, an inorganic compound such as silicon oxide, silicon nitride oxide, silicon oxynitride, or silicon nitride is formed. The coating method may be a spin coating method or a dipping method. The film may be formed chemically using a CVD apparatus or the like, or physically formed using a vacuum deposition method, a sputtering method, an ion plating method, or the like. In this way, the space between the plurality of wire grids 61 can be filled with the resin or the inorganic compound. By filling the space between the plurality of wire grids 61 with a resin or an inorganic compound, the strength of the reflective polarizing layer 60 can be increased.

Further, the resin or the inorganic compound is planarized using a chemical mechanical polishing apparatus (Chemical Mechanical Polisher, CMP). At this time, the wire grid 61 may be polished so as to be exposed on the surface. By forming the third insulating member, the upper surface of the reflective polarizing layer 60 can be flattened, so that the reflective polarizing layer 60 can uniformly enter and / or emit and / or reflect light.

Subsequently, for example, with the lower surface (S2) of the light guide member 10 facing upward, the light diffusion member 170 containing the light diffusing particles (A) and at least one of a dye and a phosphor in S2 of the light guide member 10. Apply. The light diffusing member 170 can be formed by screen printing using a printing plate for forming a pattern. The pattern formation of the light diffusing member 170 is not limited to screen printing. For example, it may be performed by an ink jet method. By using screen printing, the light diffusing member 170 can be formed in a pattern relatively easily. Further, the light diffusing member 170 may be cured by irradiation with radiation such as heat drying or ultraviolet rays as necessary. The light diffusing member 170 is cured to improve the adhesion between the light diffusing member 170 and the light guide member 10. Further, the mechanical strength of the light diffusing member 170 can be increased.

The light guide plate 400 can be manufactured by the manufacturing method as described above.

The light guide plate 400 according to an embodiment of the present invention configured and manufactured as described above can expand the color gamut. In addition, the light use efficiency can be improved. Furthermore, since the light guide plate 400 according to an embodiment of the present invention is manufactured using an apparatus and a method that are usually used in the technical field of the present invention without using a special manufacturing process or manufacturing apparatus, the manufacturing cost is reduced. Can be provided.

(Second Embodiment)
In this embodiment, an example of another light guide plate according to an embodiment of the present invention will be described. In addition, description may be abbreviate | omitted regarding the structure similar to 1st Embodiment.

FIG. 3 is a schematic plan view showing the configuration of the light guide plate 440. The optical system 240 shown in FIG. 3 shows an example in which the light guide plate 440 does not have the light diffusion layer 11. The light guide plate 400 shown in FIG. 1 is different from the light guide plate 440 shown in FIG. 6 in that the light guide plate 400 shown in FIG. Except for this point, it is the same as FIG.

Since the light guide plate 440 does not have the light diffusion layer 11, it is possible to provide a light guide plate with reduced manufacturing costs compared to the case of having the light diffusion layer 11. Further, since the light diffusing layer 11 is not provided, the energy loss associated with the light diffusing layer 11 can be reduced, so that the color gamut can be further expanded with less energy loss. Moreover, since the light reflected by the wire grid reflective polarizing layer can be more efficiently recycled, the light utilization efficiency can be further improved.

FIG. 4 is a schematic plan view showing the configuration of the light guide plate 450. The optical system 250 illustrated in FIG. 4 illustrates an example in which the light guide plate 450 includes the wavelength selection layer 14. The light guide plate 400 shown in FIG. 1 is different from the light guide plate 450 shown in FIG. 4 in that the light guide plate 450 shown in FIG. 4 does not have the light diffusion layer 11 but has the wavelength selection layer 14. . Except for this point, it is the same as FIG.

The wavelength selection layer 14 can be formed, for example, by applying a material in which the dye 172 is added to a polyimide or acrylic resin. The coating method may be a spin coating method or a dipping method. The wavelength selection layer 14 may be coated with a resin to which a dye corresponding to each color is added depending on the color corresponding to each pixel included in the display panel included in the display device described later. For example, by selectively applying a resin added with a dye corresponding to blue on the light guide member 10 by using a printing plate, a blue color is formed on the light guide member 10 by using another printing plate. The resin mixed with the dye corresponding to green may be applied at a position different from the position where the resin mixed with the dye corresponding to is selectively applied.

FIG. 4 shows an example in which the light diffusing member 170 includes the dye 172 and the phosphor 174, but is not limited to this example. For example, the light diffusing member 170 may include only the phosphor 174 as shown in FIG. 3, or the light diffusing member 170 may include only the dye 172 as shown in FIG. As shown, the light diffusing member 170 may not include the dye 172 and the phosphor 174. In the light guide plate 450 illustrated in FIG. 7, the number of members included in the light diffusion member 170 is reduced, so that a light guide plate with reduced manufacturing costs can be provided.

Since the light guide plate 450 does not have the light diffusion layer 11 but has the wavelength selection layer 14, a predetermined wavelength can be selectively absorbed and transmitted, so that the color gamut can be expanded. In addition, since the light reflected by the wire grid reflective polarizing layer can be recycled with respect to a predetermined wavelength, the light use efficiency can be improved uniformly with a good balance with respect to the wavelength.

FIG. 5 is a schematic plan view showing the configuration of the light guide plate 460. An optical system 260 illustrated in FIG. 5 illustrates an example in which the light guide plate 460 includes the wavelength conversion layer 15. The light guide plate 400 shown in FIG. 1 is different from the light guide plate 460 shown in FIG. 5 in that the light guide plate 460 shown in FIG. 5 does not have the light diffusion layer 11 but has the wavelength conversion layer 15. . Except for this point, it is the same as FIG.

The wavelength conversion layer 15 can be formed by applying a phosphor 174, for example. The coating method may be a spin coating method or a dipping method. The wavelength conversion layer 15 may be coated with a phosphor that is converted into a color corresponding to each color by a color corresponding to each pixel included in a display panel included in the display device described later. For example, after selectively applying a phosphor that is converted from blue to red on the light guide member 10 by using a printing plate, a blue color is formed on the light guide member 10 by using another printing plate. The phosphor that is converted from blue to green may be applied at a position different from the position where the phosphor that is converted from red to red is selectively applied.

Since the light guide plate 460 does not have the light diffusion layer 11 but has the wavelength conversion layer 15, light having a wavelength exhibiting a predetermined color can be converted into light having a wavelength exhibiting another color. The color gamut can be expanded. Further, since the reflected light by the reflective polarizing layer can be recycled with respect to a predetermined wavelength, the light utilization efficiency can be improved uniformly with respect to the wavelength.

3 to 5 show examples in which the light diffusing member 170 includes light diffusing particles, a dye, and a phosphor, but the present invention is not limited to this example. For example, the light diffusing member 170 may include light diffusing particles and a phosphor, the light diffusing member 170 may include light diffusing particles and a dye, or the light diffusing member 170 may include only light diffusing particles. May be included. In the light guide plate 450 illustrated in FIGS. 3 to 5, the number of members included in the light diffusion member 170 is reduced, so that a light guide plate with reduced manufacturing costs can be provided.

(Third embodiment)
In the present embodiment, a configuration and a manufacturing method of a liquid crystal display panel according to an embodiment of the present invention will be described. In addition, description may be abbreviate | omitted regarding the structure similar to 1st Embodiment and 2nd Embodiment.

1. Configuration of Liquid Crystal Display Panel FIG. 6 is a schematic cross-sectional view showing the configuration of a display device including an optical system 200 having a light guide plate 210 and a liquid crystal display panel 300 according to an embodiment of the present invention. The liquid crystal display panel 300 includes a first glass substrate 20, a TFT array 30, a first light transmissive conductive layer 70, a first alignment film 80, a liquid crystal layer 90, a second alignment film 100, a second light transmissive conductive layer 110, A second glass substrate 120, a polarizing plate 130, and a polarizing plate 131 are included. Note that the liquid crystal display panel 300 may not include the polarizing plate 131.

The TFT array 30 is a layer in which a pixel region 104, gate side driving circuits 108 and 109, and a source side driving circuit 112 are formed by a plurality of thin film transistors, capacitor elements, resistance elements, various wirings, and the like. The TFT array 30 has a role of driving the liquid crystal display panel 300. The first light-transmitting conductive layer 70 and the second light-transmitting conductive layer 110 have a role of controlling a liquid crystal element included in the liquid crystal layer 90 by applying a voltage to each. The first alignment film 80 and the second alignment film 100 are liquid crystal elements included in the liquid crystal layer 90 when a voltage is applied to each of the first light transmitting conductive layer 70 and the second light transmitting conductive layer 110. Has the role of orientation. The liquid crystal display panel 300 can be realized by sandwiching these components between the first glass substrate 20 and the second glass substrate 120. The polarizing plate 130 has a role of aligning and transmitting random polarized light to polarized light in a specific direction. 6 illustrates an example in which the liquid crystal display panel 300 includes the color filter layer 40 including the red color filter layer 50, the green color filter layer 51, and the blue color filter layer 52. The color filter layer 40 may not be provided.

FIG. 7 is a schematic plan view showing the configuration of the liquid crystal display panel 300 according to an embodiment of the present invention.

The liquid crystal display panel 300 includes a first glass substrate 20, a pixel region 104, gate side driving circuits 108 and 109, a source side driving circuit 112, a connector 114, and an integrated circuit (IC) 116.

On the first glass substrate 20, the pixel region 104, the gate side drive circuits 108 and 109, and the source side drive circuit 112 are formed. The connector 114 is connected to the first glass substrate 20. An integrated circuit (IC) 116 is provided on the connector 114.

The pixel area 104 includes a plurality of pixels 106. The plurality of pixels 106 are arranged along one direction and a direction intersecting with one direction. The number of arrangement of the plurality of pixels 106 is arbitrary. For example, m pixels 106 in the X direction and n pixels 106 in the Y direction are arranged. m and n are each independently a natural number greater than 1. The pixel area 104 becomes a display area. Each of the pixels 106 includes a display element, and the display element includes a liquid crystal element.

For example, display elements corresponding to the three primary colors of red (R), green (G), and blue (B) can be provided in each of the three pixels. A full color liquid crystal display panel can be provided by supplying 256 steps of voltage or current to each pixel. Further, there is no limitation on the arrangement of the plurality of pixels 106. For example, a stripe arrangement or a delta arrangement may be adopted. In the liquid crystal display panel 300 according to an embodiment of the present invention, an example of a stripe arrangement will be described.

The connector 114 has a role of supplying a video signal, a timing signal for controlling the operation of the circuit, a power source, and the like to the gate side driving circuits 108 and 109 and the source side driving circuit 112. The connector 114 may use a flexible printed circuit (FPC). A video signal, a timing signal for controlling the operation of the circuit, a power source, and the like are supplied from an external circuit to the gate side driving circuits 108 and 109 and the source side driving circuit 112 via the connector 114.

The gate side driver circuits 108 and 109 and the source side driver circuit 112 drive each pixel 106 using the supplied video signal, a timing signal for controlling the operation of the circuit, a power source, and the like, and display an image in the pixel region 104. Have a role to play.

All of the gate side drive circuits 108 and 109 and the source side drive circuit 112 may not be formed on the first glass substrate 20. For example, an integrated circuit (IC) including part or all of the functions of the gate side driver circuit and the source side driver circuit may be disposed on the first glass substrate 20 or the connector 114. Note that the integrated circuit (IC) 116 illustrated in FIG. 7 has some functions of a gate-side driver circuit and a source-side driver circuit.

FIG. 8 is a schematic plan view showing the pixel 106 included in the liquid crystal display panel 300 according to an embodiment of the present invention. The pixel shown in FIG. 8 can be applied to a VA (Vertical Alignment) method or a TN (Twisted Nematic) method in which a voltage is applied in a direction perpendicular to the first glass substrate 20 to control a liquid crystal element. Note that the pixels 106 included in the liquid crystal display panel 300 according to an embodiment of the present invention are not limited to the pixels shown in FIG. For example, the pixel 106 included in the liquid crystal display panel 300 according to an embodiment of the present invention can be applied to an IPS (In Plane Switching) method in which a voltage is applied to the first glass substrate 20 in a horizontal direction to control a liquid crystal element. It may be.

8 includes a thin film transistor 190, a capacitor 196, a source wiring 191, a gate wiring 192, a capacitive potential line 193, and a first light-transmitting conductive layer 70. The pixel 106 shown in FIG. The thin film transistor 190 includes a semiconductor layer 32, a gate electrode 34, source / drain electrodes 36 and 38, and first openings 39a and 39b. The source / drain electrodes 36 and 38 are electrically connected to the semiconductor layer 32 through the first openings 39a and 39b. The first translucent conductive layer 70 is electrically connected to the source / drain electrode 38 via the second opening 194 and the third opening 195. A capacitor element 196 is formed by the source / drain electrode 38, the gate insulating film 33 described later, and the capacitor potential line 193. The source / drain electrodes 36 and the source wiring 191 are electrically connected. The gate electrode 34 and the gate wiring 192 are electrically connected. By applying a voltage to each of the first light transmissive conductive layer 70 and the second light transmissive conductive layer 110 described later, an electric field is generated in a direction perpendicular to the first glass substrate 20 and is included in the liquid crystal layer 90. The liquid crystal element to be controlled is controlled, and the liquid crystal display panel can display an image.

2. Method for Manufacturing Liquid Crystal Display Panel A method for manufacturing the liquid crystal display panel 300 will be described with reference to FIGS. In addition, unless otherwise indicated, the manufacturing method of the liquid crystal display panel of this invention is demonstrated to the example using the photolithographic technique generally used in manufacture of a liquid crystal display panel. As long as it is a manufacturing method of a liquid crystal display panel, not only a photolithography technique but the method normally used in the technical field of this invention can be employ | adopted.

FIG. 9 is a schematic cross-sectional view showing a manufacturing method of the liquid crystal display panel 300 when the pixel configuration of FIG. 5 is applied. 3 is a schematic cross-sectional view in which three pixels included in the liquid crystal display panel 300 are enlarged. FIG.

First, the fabrication of the TFT side substrate will be described. A TFT array 30 is formed on the first glass substrate 20. The TFT array 30 includes a base film 31, a semiconductor layer 32, a gate insulating film 33, a gate electrode 34, an interlayer film 35, source / drain electrodes 36 and 38, first openings 39 a and 39 b, a capacitance potential line 193, and a resin layer 37. including. A thin film transistor 190 and a capacitor element 196 are formed in the TFT array 30.

The resin layer 37 has a role of relaxing unevenness when a film, a wiring, a transistor, or the like of a layer below the resin layer 37 is formed. Therefore, the film and pattern formed after the resin layer can be formed on a flat surface. The characteristics of the material forming the resin layer 37 are preferably a material having high transparency in the visible light region, a material having high heat resistance, and high adhesion to the wavelength conversion layer.

Next, a second opening 194 for electrically connecting the first translucent conductive layer 70 and the source / drain electrode 38 is formed. The second opening 194 opens the resin layer 37.

Subsequently, the first translucent conductive layer 70 is formed. The first light-transmissive conductive layer 70 is connected to the source / drain electrodes 38 of the pixel, and has a role of driving a liquid crystal element included in the liquid crystal layer 90 to which a voltage corresponding to a video signal is applied. As a material for forming the first light-transmissive conductive layer 70, for example, a material that transmits light, such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), or the like can be used. A first alignment film 80 is formed on the first translucent conductive layer 70. The first alignment film 80 has a role of insulating the first light-transmitting conductive layer 70 and the second light-transmitting conductive layer 110 formed on the side facing the liquid crystal layer 90 so as not to conduct. As a material for forming the first alignment film 80, for example, a polyimide resin or the like is used. FIG. 9 shows an example in which the first alignment film 80 is formed on the first light-transmissive conductive layer 70, but light shielding is performed between the first light-transmissive conductive layer 70 and the first alignment film 80. There may be a layer in which a film is formed or an inorganic compound layer. The light-shielding film layer has a role of blocking visible light, and the inorganic compound layer has a role of insulating from the conductive layer on the opposite surface.

As described above, a substrate on the TFT side can be produced.

Next, the opposite substrate will be described. The counter substrate includes a second glass substrate 120, a color filter layer 40, a second light transmissive conductive layer 110, and a second alignment film 100.

The color filter layer 40 is formed on the second glass substrate 120. What is necessary is just to select the order of formation of the color filter layer 40 suitably. For example, the red color filter layer 50 may be formed, the green color filter layer 51 may be formed, and the blue color filter layer 43 may be formed. The color filter layer may be formed on the entire surface by coating and then formed by photolithography using a photomask. Note that the forming method is not limited to this method.

Subsequently, after forming the second light-transmissive conductive layer 110, the second alignment film 100 is applied. The second light transmissive conductive layer 110 applies a voltage vertically to the liquid crystal element included in the liquid crystal layer 90 disposed between the second light transmissive conductive layer 110 and the first light transmissive conductive layer 70. It has a role to control the liquid crystal element. As a material for forming the second light-transmissive conductive layer 110, a material that transmits light, such as ITO or IZO, can be used. The second alignment film 100 has a role of insulating the second light-transmissive conductive layer 110 and the first light-transmissive conductive layer 70 formed on the side facing the liquid crystal layer 90 so as not to conduct. As a material for forming the second alignment film 100, for example, a polyimide resin or the like is used. Although FIG. 9 shows an example in which the second alignment film 100 is formed under the second light-transmissive conductive layer 110 toward the paper surface, the second light-transmissive conductive layer 110 and the second alignment film are illustrated. Between 100, there may be a layer on which a light-shielding film is formed or an inorganic compound layer. The light-shielding film layer has a role of blocking visible light, and the inorganic compound layer has a role of insulating from the conductive layer on the opposite surface.

As described above, the opposite substrate can be manufactured.

For example, the TFT side substrate and the counter side substrate thus manufactured are bonded to each other with a liquid crystal layer 90 interposed therebetween using a sealing material. Furthermore, the liquid crystal display panel 300 can be manufactured by bonding the polarizing plate 130 and the polarizing plate 131 to the second glass substrate 120.

Provided is a display device capable of improving the light utilization efficiency by using a display device including the display panel having the above-described configuration and an optical system having a light guide plate according to an embodiment of the present invention. Can do. In addition, it is possible to provide a display device that has good color reproducibility and can realize a bright and clear display. Furthermore, since a special manufacturing apparatus is not required and an existing manufacturing facility can be used, a display device that can reduce manufacturing costs can be provided.

(Fourth embodiment)
In this embodiment, the result of simulating the relationship between the transmittance and wavelength of a light diffusing member containing light diffusing particles and a dye will be described. In addition, in a member in which light diffusing particles and dyes used for the light guide plate and a color filter are combined, the result of simulating the relationship between the wavelength intensity and the wavelength transmitted through the member, and the chromaticity coordinates are calculated and plotted. The results will be described. Furthermore, it is a figure. The result of simulating the relationship between the intensity of the wavelength and the wavelength transmitted through the light guide plate when the ratio of the dye blended in the light diffusing particles used in the light guide plate is changed, and the result of calculating and plotting the chromaticity coordinates Will be explained.

1. The result of having simulated the relationship between the transmittance | permeability and wavelength of the light-diffusion member containing light-diffusion particle | grains and dye FIG. 10: Transmission of the material A and material B which are dyes used for the light-guide plate which concerns on one Embodiment of this invention. It is the result of having simulated the relationship between a rate and a wavelength.

According to FIG. 10, the light diffusing member including the light diffusing particles and the material A has an extremum of absorption near 590 nm. That is, the light diffusing member including the light diffusing particles and the material A can selectively prevent light in the vicinity of 590 nm from being transmitted. Further, according to FIG. 10, the light diffusing member including the light diffusing particles and the material B has an absorption extreme value in the vicinity of 500 nm. That is, the light diffusing member including the light diffusing particles and the material B can selectively prevent the light in the vicinity of 500 nm from being transmitted.

2. FIG. 11A and FIG. 11B show a result of simulating the relationship between the intensity of the wavelength and the wavelength transmitted through the member in a combination of the light diffusing particles and dye used in the light guide plate and the color filter. It is the result of having simulated the relationship between the intensity | strength of the wavelength which permeate | transmits the said member, and the wavelength in the member which combined the light diffusing particle used for the light-guide plate which concerns on a form, the material A and material B which are dyes, and a color filter. .

FIG. 11A shows the relationship between the wavelength and intensity of the light source LED, the relationship between the wavelength and intensity when the light source LED and the blue color filter are used, and the wavelength and intensity when the light source LED and the green color filter are used. And the relationship between the wavelength and the intensity when the LED as the light source and the red color filter are used. It can be seen that there is a mixed color of blue and green in the vicinity of 500 nm indicated by the arrow. It can also be seen that there is a mixed color of green and red in the vicinity of 590 nm indicated by the arrow.

FIG. 11B shows the relationship between the wavelength and intensity of the LED as the light source, the relationship between the wavelength and intensity when using the LED as the light source, the blue color filter, the light diffusing particles, and the materials A and B as the dye. Relationship between wavelength and intensity when using certain LED, green color filter, light diffusing particle and dye material A and material B, and light source LED, red color filter, light diffusing particle and dye material The relationship between wavelength and intensity when A and material B are used is shown. FIG. 11A shows that by using the light diffusing particles and the materials A and B, which are dyes, there is almost no color mixture of blue and green in the vicinity of 500 nm indicated by the arrow. In addition, it can be seen that there is almost no mixed color of green and red near 590 nm indicated by an arrow. That is, the light diffusing member including the light diffusing particles and the material B can selectively prevent the light in the vicinity of 500 nm from being transmitted.

3. FIG. 12 is a diagram in which chromaticity coordinates are calculated based on the simulation results shown in FIGS. 11A and 11B and plotted based on the simulation results shown in FIGS. 11A and 11B. The chromaticity coordinates were calculated from the result of multiplying the transmission coefficient of each wavelength obtained by simulation for each material by the values of x, y and z obtained from the color matching function of each wavelength. The calculation of chromaticity coordinates can be adopted as long as it is a method that is usually used in the technical field of the present invention. Table 1 shows the calculation results of the chromaticity coordinates and the color reproducibility of each of BT709, NTSC, and BT2020.

The broken lines shown in FIG. 12 are chromaticity coordinates when the light diffusing particles and the materials A and B that are dyes are not used. The solid line shown in FIG. 12 is chromaticity coordinates when the light diffusing particles and the materials A and B which are dyes are used. It can be seen that the triangle indicated by the solid line is larger and the color reproducibility is better than the triangle indicated by the broken line. Further, as shown in Table 1, BT709 is obtained when the light diffusing particles and the materials A and B, which are dyes, are used, as compared with the case where the materials A and B, which are the light diffusing particles and the dyes, are not used. , NTSC, and BT2020, the color reproducibility is improved by about 10%.

4). The result of simulating the relationship between the intensity of the wavelength transmitted through the light guide plate and the wavelength when the ratio of the dye blended in the light diffusing particles used in the light guide plate is changed. FIG. 13 relates to an embodiment of the present invention. It is the result of having simulated the relationship between the intensity | strength of the wavelength which permeate | transmits the said light-guide plate, and a wavelength when changing the ratio of the material A which is a dye mix | blended with the light-diffusion particle | grains used for a light-guide plate. In addition, the ratio of the material A to mix | blend is 4 levels of 0 mass%, 10 * 10 <^-6> mass%, 100 * 10 <^-6> mass%, and 1000 * 10 <^-6> mass%.

As shown in FIG. 13, by increasing the proportion of the material A, the light intensity in the vicinity of 590 nm indicated by the arrow is weakened. That is, by applying a light diffusing member including light diffusing particles and material A to the light guide plate, light in the vicinity of 590 nm can be selectively prevented from being transmitted.

5). FIG. 14 is a diagram in which chromaticity coordinates are calculated from the simulation results shown in FIG. 13 and plotted. Similarly to FIG. 11, the chromaticity coordinates were calculated from the result of multiplying the transmission coefficient of each wavelength obtained by simulation for each material by the values of x, y, and z obtained from the color matching function of each wavelength. The calculation of chromaticity coordinates can be adopted as long as it is a method that is usually used in the technical field of the present invention. Table 2 shows the calculation result of the chromaticity coordinates and the color reproducibility of each with BT2020.

The broken line shown in FIG. 14 is the chromaticity coordinate of the LED used in the experiment. The dashed-dotted line shown in FIG. 14 is a chromaticity coordinate when the ratio of the material A to mix | blend is 0 mass%. The solid line shown in FIG. 14 is a chromaticity coordinate when the ratio of the material A to be blended is 1000 × 10 ⁻⁶ mass%. It can be seen that the triangle indicated by the solid line is larger than the triangle indicated by the alternate long and short dash line, and the color reproducibility is better. Further, as shown in Table 2, the color reproducibility is improved by increasing the proportion of the material A to be blended. That is, color reproducibility can be improved by increasing the ratio of the material A that is a dye blended in the light diffusing particles used in the light guide plate.

Each embodiment of the present invention described above, or a part described in each embodiment, can be combined as appropriate within a range that does not contradict each other. In addition, those in which a person skilled in the art has added, deleted, or changed a design based on each embodiment, or those in which a process has been added, omitted, or changed in conditions also include the gist of the present invention. As long as it falls within the scope of the present invention.

In addition, even if the operational effects are different from the operational effects provided by the aspects of the embodiments of the present invention described above, those that are apparent from the description of the present specification or that can be easily predicted by those skilled in the art. , To be construed as provided by the present invention.

DESCRIPTION OF SYMBOLS 10 ... Light guide member, 11 ... Light-diffusion layer, 12 ... Light source, 12A ... Incident light from a light source, 13 ... Reflector plate, 13A ... Reflected light from a reflector plate, 13B ... Incident light from a reflector plate to a light guide plate, DESCRIPTION OF SYMBOLS 14 ... Wavelength selection layer, 15 ... Wavelength conversion layer, 20 ... 1st glass substrate, 30 ... TFT array, 31 ... Base film, 32 ... Semiconductor layer, 33 ... Gate insulating film, 34 ... Gate electrode, 35 ... Interlayer film, 36, 38 ... source / drain electrodes, 37 ... resin layer, 39a, 39b ... first opening, 40 ... color filter layer, 50 ... red color filter layer, 51 ... green color filter layer, 52 ... blue color filter layer, 60 ... reflective polarizing layer, 61 ... wire grid, 62 ... insulating member, 64 ... emitted light of optical system 200, 70 ... first light-transmissive conductive layer, 80 ... first alignment film, 90 ... liquid crystal layer, 100 ... second Alignment film, 104 ... pixel 106, pixel, 108, 109 ... gate side driving circuit, 110 ... second translucent conductive layer, 112 ... source side driving circuit, 114 ... connector, 116 ... integrated circuit (IC), 120 ... second glass substrate , 130, 131 ... Polarizing plate, 170 ... Light diffusing member, 170A ... Diffusing light, 190 ... Thin film transistor, 191 ... Source wiring, 192 ... Gate wiring, 193 ... Capacitance potential line, 194 ... Second opening, 196 ... Capacitance Element, 200, 240, 250, 260 ... Optical system, 300 ... Liquid crystal display panel, 400, 440, 450, 460 ... Light guide plate

Claims (21)

A light guide member having a first surface and a second surface opposite to the first surface to guide incident light;
A polarizer layer disposed on the light guide member;
A light diffusing member disposed on the second surface of the light guide member;
Have
The light diffusing member is a light guide plate including light diffusing particles and a dye or a phosphor. A light guide member having a first surface and a second surface opposite to the first surface to guide incident light;
A polarizer layer disposed on the first surface of the light guide member;
A light diffusing member disposed on the second surface of the light guide member;
Have
The light diffusing member is a light guide plate including light diffusing particles and a dye or a phosphor. The light guide plate according to claim 1, wherein the polarizer layer is a layer having a metal pattern. The light guide plate according to claim 1, wherein the polarizer layer includes a metal pattern and an insulating layer embedded between the metal patterns. 2. The light guide plate according to claim 1, wherein a plurality of the light diffusing members are spaced apart from each other within the second surface. The light guide plate according to claim 1, further comprising a light diffusion layer that diffuses light between the polarizer layer and the first surface. The light guide plate according to claim 6, wherein the light diffusion layer includes one of a wavelength conversion member that converts a wavelength of light and a wavelength selection member that selects a wavelength of light. The light guide plate according to claim 1, wherein the first surface is in contact with the polarizer layer. The light guide plate according to claim 6, wherein one surface of the light diffusion layer is in contact with the first surface, and a surface opposite to the one surface is in contact with the polarizer layer. The light guide plate according to claim 1, wherein the dye has at least one absorption beak in a visible light band. The light guide plate according to claim 1, wherein a ratio of the dye contained in the light diffusing member is 0.01 × 10 ⁻⁴ parts by mass or more and 10 × 10 ⁻⁴ parts by mass or less. The phosphor is at least one of a wavelength conversion member that absorbs blue wavelength light and emits red wavelength light, and a wavelength conversion member that absorbs blue wavelength light and emits green wavelength light. The light guide plate according to claim 1. The polarizer layer has a blue wavelength p-wave reflectivity relatively higher than a red wavelength reflectivity and a green wavelength reflectivity, and the blue wavelength p-wave reflectivity is 2. The light guide plate according to claim 1, wherein the light guide plate has a lower transmittance than that of the red wavelength and the transmittance of the green wavelength. The light guide plate according to claim 1, wherein the plurality of light diffusion members include two or more different pattern shapes. The plurality of light diffusing members have an island-shaped pattern shape, and the island-shaped pattern shape is enlarged from the end of the second surface toward the inside. The light guide plate according to 1. The light guide plate according to claim 1;
A light source that emits light;
A liquid crystal display panel,
The light source is disposed adjacent to an end of the light guide plate;
The liquid crystal display panel is a display device disposed on the first surface side of the light guide plate. The display device according to claim 16, wherein the light emitted from the light source is white light or blue light. The display device according to claim 16, further comprising a light diffusion layer that diffuses light between the polarizer layer and the first surface. The display device according to claim 18, wherein the light diffusion layer includes any one of a wavelength conversion member that converts a wavelength of light and a wavelength selection member that selects a wavelength of light. The display device according to claim 17, further comprising a reflector that reflects light. Curable resin composition for constituting a light diffusion layer for diffusing light.

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