JPH11281811A - Hologram color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hologram color filter which has excellent dimensional precision and flatness and can easily be manufactured in high yield with high productivity as a spacer between a hologram color filter layer and a liquid crystal layer. SOLUTION: This hologram color filter 1 is constituted by stacking a spacer consisting of a transparent resin film 5 and/or transparent resin coating film on the holographic color filter formed on a glass substrate 11 and further stacking a transparent electrode 15 on the spacer. In this case, the holographic color filter diffracts luminous flux which is made incident from a specific direction selectively by >=2 wavelength ranges and converges it on scattered dots in an array shape at a fixed distance from the hologram surface adjacently by the different wavelength range, and the spacer transmits the diffracted converged light to nearby the transparent electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hologram color filter, and more particularly to a hologram color filter used for a color liquid crystal display.

[0002]

2. Description of the Related Art A hologram color filter for a color liquid crystal display device utilizing the wavelength selectivity of a volume hologram has been proposed in Japanese Patent Publication No. Hei 2-500937. The principle will be described with reference to FIG. This figure is a cross-sectional view of a color liquid crystal display device, in which a liquid crystal layer 14 such as a twisted nematic liquid crystal is sandwiched between transparent glass plates 12 and 13, and a liquid crystal layer 14
A transparent pixel electrode 16 including a TFT is provided on a surface in contact with the liquid crystal layer 14 of the transparent glass plate 12 on the illumination side, and a common counter electrode 15 is provided on a surface in contact with the liquid crystal layer 14 on the illumination side. An alignment film or the like is provided on the surface. The pixel electrode 16 can be controlled independently for each of the R (red), G (green), and B (blue) pixels.
As shown, the liquid crystal layer 14 includes an R pixel 1R, a G pixel 1
It can be divided into regions of G and B pixels 1B. This pixel 1R,
The dimension Δ of 1G and 1B is, for example, 10 μm.

The hologram color filter layer 2 is disposed between the transparent glass plate 12 on the illumination side and the transparent glass plate 11 on the incident side. As shown in the figure, the hologram color filter layer 2 includes, for example, a volume hologram layer for R light diffraction 2R, a volume hologram layer for G light diffraction 2G, B
It consists of three layers of the volume hologram layer for light diffraction 2B, or one layer in which a volume hologram for R light diffraction, a volume hologram for G light diffraction, and a volume hologram for B light diffraction are multiplex-recorded in one layer.

[0004] The volume hologram layer for R light diffraction 2R is adjacent to or partially overlaps the surface thereof, and the R pixels 1R, G
Pixels 1G, composed of three pixels repetitive pitch array of recorded R diffracting hologram 2R ₁ at the same pitch of the B pixels 1B, G light diffraction volume hologram layer 2G, B
Similarly, the volume hologram layer 2B for light diffraction is also adjacent to or partially overlapped in the plane, and the R pixel 1R, the G pixel 1
A hologram 2G ₁ for G light diffraction recorded at the same pitch as the repetition pitch of the three pixels G and B pixels 1B
The array consists of an array of B light diffraction hologram 2B _1. However, the centers of the hologram 2R ₁ for R light diffraction, the hologram 2G ₁ for G light diffraction, and the hologram 2B ₁ for B light diffraction are shifted from each other by Δ.

The holograms for R light diffraction 2R ₁ , G
Hologram 2G ₁ for light diffraction, hologram 2B for B light diffraction
Each of ₁ selectively diffracts light in the R wavelength region, light in the G wavelength region, and light in the B wavelength region in the backlight 50 incident at a predetermined angle through the transparent glass plate 11 on the incident side, Since the transparent glass plate 12 has a property of condensing light in the vicinity of the surface of the liquid crystal layer 14 side, the condensing positions of the respective diffracted lights 30R, 30G, and 30B are the positions of the R pixel 1R, G pixel 1G, and B pixel 1B. It corresponds to.

[0006] With such a configuration, the white backlight 50, which has been linearly polarized into, for example, S-polarized light by a polarizing plate or the like on the incident side (not shown), is spectrally condensed by the hologram color filter layer 2, and the R pixel 1R , G pixel 1G, B pixel 1
B, red and green-blue light are incident on each pixel, the polarization plane is rotated by an angle corresponding to the control state of each pixel in the liquid crystal layer 14, and a polarizing plate (not shown) disposed on the emission side is rotated by the polarization plane. By transmitting at an intensity corresponding to the rotation state, an image represented by a set of R pixels 1R, G pixels 1G, and B pixels 1B is displayed.

The hologram color filter layer 2 sandwiched between the transparent glass plates 11 and 12 constitutes a hologram color filter.
mm to 1.1 mm, preferably about 0.7 mm, each layer 2R, 2G, 2B of the hologram color filter layer 2.
Is about several μm each, and the transparent glass plate 12 is 50 μm
Thicknesses of the order of magnitude are used.

Conventionally, in such a hologram color filter, a volume type hologram photosensitive layer such as a photopolymer is formed on a thick transparent glass plate 11 for easy handling and the like. After photographing three holograms 2R ₁ , 2G ₁ , and 2B ₁ simultaneously or sequentially on the layer, 50 holograms are formed on the hologram photosensitive layer.
It was manufactured by bonding a thin transparent glass plate 12 having a thickness of about μm using an adhesive or the like.

However, the transparent glass plate 12 has a size of 50 μm.
It is difficult to handle because of the thickness of about m, and the gap between the transparent electrode 15 and the hologram layer 2 is required to have a high dimensional accuracy of several μm or less due to the demand for color reproducibility. In order to form an alignment film or the like on the liquid crystal layer 14 side of the transparent glass plate 12, the transparent glass plate 12 is required to have high flatness. Further, in bonding the thin transparent glass plate 12, it is necessary to monitor the gap in the order of μm, perform high-precision positioning, and consider shrinkage after the adhesive is cured, which deteriorates productivity and yield. Cause.

Therefore, as a method for increasing the dimensional accuracy between the thin transparent glass plate 12 and the hologram layer 2, the surface of the thin transparent glass plate 12 functioning as a spacer between the hologram color filter layer 2 and the liquid crystal layer 14 is used. A method of directly forming a hologram photosensitive layer on the transparent glass plate 12 is considered.
Forming a film by a method such as laminating requires the transparent glass plate 1
Since 2 is a very thin glass plate of about 50 μm, the strength is low, and it is very difficult including the subsequent handling.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a dimensional accuracy and flatness as a spacer between a hologram color filter layer and a liquid crystal layer. An object of the present invention is to provide a hologram color filter which has good properties, can be easily produced, has good yield, and can be manufactured with high productivity.

[0012]

According to a first hologram color filter of the present invention which achieves the above object, a spacer made of a transparent resin film is laminated on a holographic color filter formed on a glass substrate, and a spacer is formed on the holographic color filter. The holographic color filter further includes a transparent electrode laminated thereon, wherein the holographic color filter selectively diffracts a light beam incident from a predetermined direction for each of two or more different wavelength regions to be adjacent to each other for each different wavelength region. Further, it is characterized in that the light is condensed at different discrete points in an array at a certain distance from the hologram surface, and that the spacer transmits diffracted condensed light to the vicinity of the transparent electrode.

According to the second hologram color filter of the present invention, a spacer composed of a laminated body of a transparent resin film and a transparent resin coating film is laminated on a holographic color filter formed on a glass substrate, and a transparent film is further formed on the spacer. A holographic color filter in which electrodes are stacked, wherein the holographic color filter selectively diffracts a light beam incident from a predetermined direction for each of two or more different wavelength regions, and is adjacent to each of different wavelength regions; It is characterized in that the light is condensed at different discrete points in an array at a certain distance from the hologram surface, and the spacer transmits the diffracted condensed light to the vicinity of the transparent electrode.

In the first and second hologram color filters, when a transparent resin film is laminated on a holographic color filter formed on a glass substrate, the transparent resin film is laminated via an adhesive layer. .

A third hologram color filter according to the present invention is a hologram color filter comprising a holographic color filter formed on a glass substrate, a spacer comprising a transparent resin coating film laminated thereon, and a transparent electrode further laminated on the spacer. Wherein the holographic color filter selectively diffracts a light beam incident from a predetermined direction for each of two or more different wavelength regions and is adjacent to each of the different wavelength regions, and is arranged in an array at a certain distance from the hologram surface. And the spacer transmits the diffracted condensed light to the vicinity of the transparent electrode.

In the fourth hologram color filter of the present invention, a spacer composed of a laminate of a transparent resin film and a transparent resin film is laminated on a holographic color filter formed on a glass substrate, and a transparent electrode is further formed on the spacer. A holographic color filter, wherein the holographic color filter selectively diffracts a light beam incident from a predetermined direction for each of two or more different wavelength regions to be adjacent to each other for each of different wavelength regions. It is characterized in that the light is condensed at different discrete points in an array at a certain distance from the surface, and the spacer transmits diffracted condensed light to the vicinity of the transparent electrode.

In the first to fourth hologram color filters, the surface roughness of the spacer laminated on the holographic color filter is 0.1 μm or less.
The retardation is 100 nm or less, and the difference between the refractive index of the spacer and the refractive index of the holographic color filter is 0.1 or less.

The hologram color filter of the present invention comprises:
The use of a transparent resin film as a spacer between the holographic color filter and the liquid crystal layer makes it easy to handle, and the use of a transparent resin coating film enables the spacer to have an optical thickness and flatness. Since the characteristics can be easily adjusted, a hologram color filter with high yield and high productivity can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first to fourth hologram color filters of the present invention will be described below with reference to the sectional views of FIGS. In the figure, 1 is a hologram color filter, 2 is a holographic color filter (hereinafter also referred to as a hologram color filter), 2R
Is a holographic lens array for R, 2G is a holographic lens array for G, 2B is a holographic lens array for B, 3 is an oxygen barrier film, 4 is an adhesive layer, 5 is a transparent resin film, and 6 is a transparent resin coating film. , 11 are glass substrates, and 15 is a transparent electrode.

As shown in FIG. 1, in the first hologram color filter, a spacer made of a transparent resin film 5 is laminated on a hologram color filter 2 formed on a glass substrate 11 with an adhesive layer 4 interposed therebetween. It has a structure in which the transparent electrode 15 is further laminated on the spacer.

The glass substrate 11 is made of a rigid material having no flexibility, such as quartz glass, Pyrex glass, or a synthetic quartz plate.
Alternatively, a flexible material having flexibility such as a transparent resin film or an optical resin plate can be used. As the glass, Corning "7059", "1378",
"AL" and "AN635" manufactured by Asahi Glass Co., Ltd., "OA2" and "OA10" manufactured by Nippon Electric Glass Co., Ltd., "NA45" and "NA35" manufactured by NH Techno Glass Co., Ltd., "AF45" manufactured by Shot Company, etc. Among them, especially Corning 7
059 glass is a material having a small coefficient of thermal expansion, excellent in dimensional stability and workability in high-temperature heat treatment, and is a non-alkali glass containing no alkali component in the glass. Suitable for. The film thickness is, for example, 0.5 mm to 1.1 mm, and preferably 0.7 mm.

The hologram color filter layer 2 is provided on the glass substrate 11. As shown in the figure, the hologram color filter layer 2 includes, for example, three layers of an R light diffraction volume hologram layer 2R, a G light diffraction volume hologram layer 2G, and a B light diffraction volume hologram layer 2B, or one layer. And a hologram for R light diffraction, a volume hologram for G light diffraction, and a volume hologram for B light diffraction. Examples of the volume hologram recording material include known volume hologram recording materials such as a silver salt material, a dichromated gelatin emulsion, a photopolymerizable resin, and a photocrosslinkable resin, and include a matrix polymer, a photopolymerizable compound, and a photopolymerization initiator. A photosensitive material for use in dry volume phase hologram recording, comprising a sensitizing dye and a sensitizing dye, is preferably used. The coating solution may be formed by spin coating. For example, Omnidex 706M (manufactured by DuPont, having a film thickness of 20) may be used.
.mu.m).

As a method of forming the hologram color filter layer 2, a case of a three-layer structure will be exemplified. After spin-coating the photosensitive material on the glass substrate 2 and performing a heat treatment, polyvinyl alcohol is further applied as a oxygen blocking film 6 as an interlayer protective film by a spin coat method, and a heat treatment is performed to optically adhere. , R photosensitive material layer. A computer hologram (CGH) as an original is brought into close contact with the R photosensitive material layer, exposed to a laser beam having a wavelength for recording 2R for holographic lens array 2R, heated, and heated to form a holographic lens array for R. 2R is obtained. By the same operation, the holographic lens array 2 for G is placed on the holographic lens array 2R for R.
The holographic lens array 2B for B and the oxygen barrier film 6 are laminated on the holographic lens array 2G for G and the oxygen barrier film 6 via the oxygen barrier film 6 to form the hologram color filter layer 2.

Further, as a method for producing a hologram color filter, for example, as a hologram 2R _1, 2G _1, the 2B ₁ array methods replication having wavelength selectivity shown in FIG. 5, without using the CGH, the hologram 2R _1, 2G ₁ ,
2B may be used volume hologram having the same characteristics and _one of the array. The holograms 2R ₁ , 2G ₁ , 2
It may be made by two-beam interference exposure regardless of the array B ₁ replication. In such a case, interference may be caused in the volume hologram photosensitive layer by using parallel light similar to zero-order light as reference light and condensed light similar to diffracted light as object light.
In order to obtain an array of condensed light such as diffracted light, for example, a microlens array may be used.

Next, the transparent resin film 5 which characterizes the present invention will be described. The transparent resin film 5 functions as a spacer between the hologram color filter 2 and the transparent electrode for liquid crystal display, and forms an optical path of the diffracted light by the hologram color filter. Is 0.1
Or less, preferably 0.05 or less, and the film has a surface roughness of 0.1 μm or less, preferably 0.05 μm or less.
Or less, the birefringence is small, and the retardation value is preferably 100 nm or less, preferably 10 nm or less. Therefore, as the transparent resin film, unstretched ethylene-vinyl alcohol copolymer resin (EVAL) film, acrylic resin film, unstretched polyvinyl alcohol film, polynorbornene film, and polyimide resin excellent in heat resistance, which are excellent in these optical properties, are used. A film is exemplified. The thickness of the film is appropriately set so that the condensed light diffracted by the hologram color filter is transmitted to the vicinity of the transparent electrode, and is, for example, 50 μm.

These transparent resin films 5 are preferably laminated on the hologram color filter 2 via the adhesive layer 4. As the adhesive layer 4, an acrylic resin, an acrylate resin, a vinyl acetate resin, or a copolymer thereof, a styrene-butadiene copolymer, a natural rubber,
Casein, gelatin, rosin ester, terpene resin,
Examples include phenolic resins, styrene resins, chromanindene resins, polyvinyl ethers, silicone resins, and the like. Also, alpha-cyanoacrylate, silicone, maleimide, styrene, polyolefin, resorcinol, and polyvinyl ether adhesives The solvent solution is preferably applied by spin coating to a uniform thickness of 1 μm to 30 μm.

The transparent resin film 5 is preferably transferred on the adhesive layer 4 by a transfer method using a transfer member laminated on a temporary base material in a releasable manner, and the transparent resin film 5 is provided with the adhesive layer interposed therebetween. In the state of being laminated on the hologram color filter, the surface roughness of the spacer comprising the transparent resin film 5 including the adhesive layer is 0.1 μm or less, preferably 0.05 μm or less, and the retardation value is 100 nm or less, preferably 10 nm. It is preferable that the hologram color filter has the following properties.

On the transparent resin film 5, a transparent electrode 15 is formed of indium tin oxide (ITO), zinc oxide (ZnO),
It is formed by a general film forming method such as a sputtering method, a vacuum evaporation method, and a CVD method using tin oxide (SnO) or an alloy thereof, and a predetermined pattern is formed by etching using a photoresist as necessary. It is what it was. The thickness of the transparent electrode 6 is about 20 to 500 nm, preferably about 100 to 300 nm.

Next, the second hologram color filter of the present invention will be described with reference to FIG. The second hologram color filter of the present invention is obtained by applying a transparent resin coating film 6 on the transparent resin film 5 in the above-described first hologram color filter, and then forming a transparent electrode 15.
Is formed.

The transparent resin coating film 6 is provided as a spacer for adjusting the optical characteristics such as the surface roughness and film thickness of the five transparent resin films including the adhesive layer in the first hologram color filter. .

The transparent resin coating film is formed from a UV-curable resin composition in which at least a photopolymerizable acrylate polymer, a difunctional or higher polyfunctional photopolymerizable acrylate monomer, and an initiator are mixed in a solvent.

As the photopolymerizable acrylate polymer,
Examples thereof include epoxy acrylates such as o-cresol novolak epoxy acrylate and phenol novolak epoxy acrylate, polyester acrylate, polyurethane acrylate, polyether acrylate, oligomer acrylate, alkyd acrylate, polyol acrylate, and melamine acrylate. The photopolymerizable acrylate polymer is preferably contained in the resin composition in a solid content ratio of 40 to 70% by weight.

Further, it is preferable that such a photopolymerizable acrylate polymer has an acidic group introduced therein so as to enable development of the resin composition with alkali development. As the acidic group to be introduced, a carboxyl group, a sulfone group,
Preferred are a thiocarboxyl group, a sulfine group and the like. The introduction of such an acidic group can be performed by reacting a hydroxyl group in the photopolymerizable acrylate polymer with an acid anhydride such as phthalic anhydride, succinic anhydride, and maleic anhydride. It is about 30 to 70%, preferably about 50%.

Further, as the acrylate monomer,
1,4-butanediol diacrylate, diethylene glycol diacrylate, neopentyl glycol diacrylate, pentaerythritol triacrylate,
Examples include trimethylolpropane triacrylate, pentaerythritol acrylate, dipentaerythritol hexaacrylate, and the like. The acrylate monomer has a solids content ratio of 30 to 6 in the resin formulation.
It is preferably contained in the range of 0% by weight.

As the initiator, benzophenone,
Alternatively, Irgacure 184, Irgacure 36
9, Irgacure 651, Irgacure 907 (all trade names of Ciba Specialty Chemicals),
Darocur (trade name of Merck) and the like. Such initiators have a solids content ratio of 1 to
It is preferably contained in the range of 3% by weight.

Further, a silane coupling agent may be further added to the resin composition. Examples of the silane coupling agent to be used include vinyl silane, acrylic silane, epoxy silane, amino silane and the like. Specifically, vinyltrichlorosilane, vinyltris (β-methoxyethoxy) silane, vinyltriethoxysilane, vinyltrimethoxysilane, or the like can be used as vinylsilane. Further, as the acrylic silane, γ-methacryloxypropyltrimethoxysilane,
γ-methacryloxypropylmethyldimethoxysilane and the like can be mentioned. As epoxysilane, β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane and the like can be mentioned. As aminosilane, N-
β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropylmethylditrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltri Methoxysilane and the like can be used. As other silane coupling agents, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropylmethyldimethoxysilane, γ-chloropropylmethyldimethoxysilane, γ-
Chloropropylmethyldiethoxysilane and the like can be used.

When a photopolymerizable acrylate polymer having an acidic group introduced is used as the photopolymerizable acrylate polymer, an epoxy resin can be added to the resin composition. This epoxy resin reacts with unreacted acidic groups present after exposure and development, and
For imparting alkali resistance to the film. Examples of the epoxy resin to be used include a phenol novolak type epoxy resin and a cresol novolak type epoxy resin. Such an epoxy resin is contained in the resin composition in a solid content ratio of 10 to 30% by weight. When the content of the epoxy resin is less than 10% by weight, sufficient alkali resistance cannot be imparted to the coating film. On the other hand, when the content of the epoxy resin exceeds 30% by weight, the amount of the epoxy resin which is not subjected to photocuring is reduced. , And the storage stability and developability of the resin composition are undesirably reduced.

The resin composition may be solvent-free, as described in Example 5 below, but when a solvent is used, its evaporation rate is relative to the evaporation rate of butyl acetate of 100. It is preferable to use a solvent whose value is in the range of 10 to 25. Further, a mixed solvent composed of n kinds of solvents (n is an integer of 2 or more) is used as a solvent of the resin composition, and a mixing ratio (a1:...: An (a1) of each solvent constituting the mixed solvent is used. + ... + an = 1))
And the evaporation rate as a relative value when the evaporation rate of butyl acetate of each solvent constituting the mixed solvent is 100 (A1,...)
., An) (a1 × A1 +... + An × A)
n) may be in the range of 10 to 25.

As a result, the transparent resin coating film 6 has no macroscopic film thickness unevenness such as uneven streaks or striations or scale-like unevenness, and has a microscopic film thickness unevenness. The degree of unevenness is small and good flatness can be obtained. If the evaporation rate of the solvent is less than 10 in relative value, or if the sum of the product of the mixing ratio and the evaporation rate is less than 10, the evaporation rate is too fast, for example, to a coating film formed using a spin coater. Indicates radial stripe-shaped film thickness unevenness (striation) from the center to the periphery
On the other hand, when the evaporation rate of the solvent exceeds 25 as a relative value, or when the sum of the product of the mixing ratio and the evaporation rate exceeds 25, the evaporation rate is too slow, and the mist-like or scale-like film thickness unevenness occurs. This is not preferable because it occurs over the entire coating film.

The evaporation rate of butyl acetate as described above is 10
Examples of the solvent having an evaporation rate in a range of 10 to 25 as a relative value when it is 0 include 3-methoxybutanol (relative value 12), 3-methoxybutanol acetate (relative value 14), and ethylcellosolve. Acetate (relative value 21) and the like can be mentioned. Further, as a mixed solvent in which the sum of the product of the mixing ratio of the constituent solvents and the evaporation rate is in the range of 10 to 25, a 0.5: 0.5 mixed solvent of propylene glycol monoethyl ether acetate and propylene glycol monobutyl ether is used. (Sum of product of mixing ratio and evaporation rate 22.5), 0.8: 0.2 mixed solvent of 3-methoxybutanol acetate and propylene glycol monoethyl ether acetate (sum of product of mixing ratio and evaporation rate 15) 0.8: 0.2 of 3, methoxybutanol acetate and propylene glycol monobutyl ether
A mixed solvent (sum of the product of the mixing ratio and the evaporation rate of 16.4), a mixed solvent of ethylcellulorub and butylcellosolve of 0.4: 0.6 (sum of the product of the mixing ratio and the evaporation rate of 16) and the like can be mentioned. it can.

The coating film 6 can be formed by applying a resin composition by a method such as spin coater, roll coater, spray, printing and the like. The solid concentration in the resin composition is preferably in the range of 10 to 50% by weight. When a spin coater is used, the number of rotations is 500 to 1500.
It is preferable to set within the range of times / minute.

Exposure to the coating film 6 can be performed by irradiating ultraviolet rays through a photomask. Also,
For the development after exposure, solvent development is possible, but alkali development is preferable in view of waste liquid treatment and the like, and in this case, a photopolymerizable acrylate polymer having an acidic group introduced as described above can be used.

After forming the coating film 6 in this manner, the transparent electrodes 15 are laminated similarly to the first hologram color filter, and the second hologram color filter is formed.

Since the transparent resin coating film 6 is formed by a coating method capable of forming a film having excellent film thickness and surface characteristics, the gap between the hologram color filter layer 2 and the transparent electrode 15 is reduced. This enables more precise control.

Further, in a state where the transparent resin coating film 6 is laminated on the transparent resin film 5, the thickness of the spacer can be adjusted to a desired thickness and the variation width thereof can be made ± 1% or less. And the surface roughness is 0.1 μm or less,
Preferably 0.05 μm or less, low birefringence, and a retardation value of 100 nm or less, preferably 10 nm
The hologram color filter having excellent color reproducibility can be obtained.

Next, a third hologram color filter of the present invention will be described with reference to FIG. In the third hologram color filter of the present invention, the transparent resin film 5 described in the second hologram color filter is laminated instead of the transparent resin film 5 in the first hologram color filter.

The transparent resin coating film 6 functions as a spacer between the hologram color filter 2 and the transparent electrode for liquid crystal display, and forms an optical path of the diffracted light by the hologram color filter. By adopting the forming material and the coating method described in the section of the filter, the difference between the refractive index of the filter and the refractive index of the hologram color filter is 0.1 or less, preferably 0.05.
Hereinafter, the surface roughness of the coating film can be 0.1 μm or less, preferably 0.05 μm or less, the birefringence is small, and the retardation value can be 100 nm or less, preferably 10 nm or less. In addition, the layer thickness on the hologram color filter layer 2, that is, the thickness as a spacer can be adjusted to a desired thickness when diffracted and condensed light is transmitted, and the variation width thereof can be made ± 1% or less. ,
A hologram color filter with excellent color reproducibility can be obtained.

After the transparent resin coating film 6 is cured by ultraviolet light,
The transparent electrodes 15 are layered in a pattern to form a third hologram color filter.

Next, a fourth hologram color filter of the present invention will be described with reference to FIG. The fourth hologram color filter of the present invention is obtained by laminating the transparent resin film 5 described in the section of the first hologram color filter on the transparent resin coating film 6 in the third hologram color filter.

The transparent resin film 5 has a surface smoothness,
By using a film having excellent uniformity of the film thickness, the film thickness of the spacer can be adjusted to a desired film thickness in a state where the transparent resin film 5 is laminated on the transparent resin coating film 6, and the surface roughness thereof can be adjusted. 0.1 μm or less, preferably 0.0
A hologram color filter having 5 μm or less, low birefringence, and a retardation value of 100 nm or less, preferably 10 nm or less, can be provided with excellent color reproducibility.

The first to the fourth inventions thus produced
The fourth hologram color filter is provided with an alignment film or the like on the surface of the common opposing electrode 15 (FIG. 5) to form one transparent substrate, and the transparent pixel electrode 16 including TFT and the alignment film on the surface of the other transparent substrate 13. And the like, and by sandwiching a liquid crystal layer 14 such as a bitonic nematic liquid crystal between the transparent substrates,
A color liquid crystal display device as shown in FIG. 5 is completed.

[0052]

The present invention will be described below in detail with reference to examples.

(Example 1) Omnidex 706M (manufactured by DuPont, film thickness: 20 μm) as a hologram recording material
A glass substrate (AL material, manufactured by Asahi Glass Co., Ltd.) having a film thickness of 1.1 mm provided with a hologram color filter using was prepared.

On this hologram color filter layer,
An adhesive layer is formed by applying a 10 μm-thick film of Norland NOA61 (manufactured by Norland Co., Ltd.) after drying by spin coating, and then forming an ethylene-vinyl alcohol copolymer film (EVAL) on the adhesive layer. EF
-E, manufactured by Kuraray Co., Ltd., film thickness 50 μm, refractive index 1.5
0) was laminated by a transfer method, adhered, and the temporary substrate was peeled off.

The laminate composed of the adhesive layer and the resin film has a thickness of 60 μm, a fluctuation range of ± 0.75%, a surface roughness of the laminate of 0.07 μm, a retardation of 50 nm, and a laminate of Of the hologram color filter was 0.002.

On this transparent resin film, an ITO electrode was formed in a thickness of 200 nm by a sputtering method to produce a first hologram color filter of the present invention.

Using this hologram color filter, an alignment film is provided on its electrode surface by a conventional method to form one transparent substrate, and a transparent pixel electrode including a TFT and an alignment film are provided on the surface of another transparent substrate. Then, a twisted nematic liquid crystal was sandwiched between the transparent substrates, and a color liquid crystal display device shown in FIG. 5 was manufactured and operated. As a result, a color liquid crystal display device having excellent color reproducibility was obtained.

Example 2 Omnidex 706M (manufactured by DuPont, film thickness 20 μm) as a hologram recording material
A glass substrate (AL material, manufactured by Asahi Glass Co., Ltd.) having a film thickness of 1.1 mm provided with a hologram color filter using was prepared.

On this hologram color filter layer,
After an adhesive layer was formed in the same manner as in Example 1, an ethylene-vinyl alcohol copolymer film (EVAL EF-E, manufactured by Kuraray Co., Ltd., 50 μm thick) was formed on the adhesive layer.
m, refractive index 1.50) were laminated by a transfer method, bonded, and the temporary substrate was peeled off.

Then, on the resin film, the composition: o-cresol novolak epoxy acrylate (50% of hydroxyl groups reacted with phthalic anhydride): 9.5 parts by weight Dipentaerythritol hexaacrylate: 9.5 parts by weight Part: Irgacure 369: 1.0 part by weight Solvent (3-methoxybutanol): 80 parts by weight is applied by spin coating (500 rpm) to a thickness of 5 μm after drying, and then 2.0 kW ultra-high pressure mercury Irradiate with ultraviolet light for 10 seconds using a lamp to cure in a pattern so as to leave a hologram color filter area and a slight margin, and then immerse in a 0.05% potassium hydroxide aqueous solution (liquid temperature 23 ° C.) for 1 minute. It was immersed and developed with alkali, and a transparent resin coating film was laminated.

The laminate composed of the adhesive layer, the resin film, and the transparent resin coating film has a thickness of 55 μm, and its variation range is ± 5 μm.
0.38%, and the surface roughness of the laminate is 0.05 μm,
The retardation was 50 nm, and the difference between the refractive index of the laminate and the refractive index of the hologram color filter was 0.003.

On this transparent resin film, an ITO electrode was formed in a thickness of 200 nm in the same manner as in Example 1 to produce a second hologram color filter of the present invention.

Using the second hologram color filter, a color liquid crystal display was manufactured and operated in the same manner as in Example 1, and a color liquid crystal display having excellent color reproducibility was obtained.

Example 3 Omnidex 706M (manufactured by DuPont, film thickness 20 μm) as a hologram recording material
A glass substrate (AL material, manufactured by Asahi Glass Co., Ltd.) having a film thickness of 1.1 mm provided with a hologram color filter using was prepared.

On this hologram color filter layer,
Composition o-cresol novolak epoxy acrylate (50% of hydroxyl groups reacted with phthalic anhydride) 9.5 parts by weight Dipentaerythritol hexaacrylate 9.5 parts by weight Irgacure 369 1.0% by weight Parts: Solvent (3-methoxybutanol): 80 parts by weight is applied by spin coating (500 rpm) to a thickness of 5 μm after drying, and then irradiated with ultraviolet rays for 10 seconds using a 2.0 kW ultrahigh pressure mercury lamp. To form a pattern so as to leave a hologram color filter area and a slight margin, and then immerse in a 0.05% aqueous potassium hydroxide solution (liquid temperature 23 ° C.) for 1 minute for alkali development, and apply a transparent resin. The films were stacked. This coating and developing treatment was repeated 10 times.

The laminate composed of the transparent resin coating film has a thickness of 50 μm, a fluctuation range of ± 0.35%, a surface roughness of the laminate of 0.07 μm, and a retardation of 75 n.
m, the difference between the refractive index of the laminate and the refractive index of the hologram color filter was 0.001.

An ITO electrode was formed on this transparent resin film in the same manner as in Example 1 to produce a third hologram color filter of the present invention.

Using the third hologram color filter, a color liquid crystal display was produced and operated in the same manner as in Example 1, and a color liquid crystal display having excellent color reproducibility was obtained.

Example 4 Omnidex 706M (manufactured by DuPont, film thickness 20 μm) as a hologram recording material
A glass substrate (AL material, manufactured by Asahi Glass Co., Ltd.) having a film thickness of 1.1 mm provided with a hologram color filter using was prepared.

On this hologram color filter layer,
Composition o-cresol novolak epoxy acrylate (50% of hydroxyl groups reacted with phthalic anhydride) 9.5 parts by weight Dipentaerythritol hexaacrylate 9.5 parts by weight Irgacure 369 1.0% by weight Parts: Solvent (3-methoxybutanol): 80 parts by weight is applied by spin coating (500 rpm) to a thickness of 5 μm after drying, and then irradiated with ultraviolet rays for 10 seconds using a 2.0 kW ultrahigh pressure mercury lamp. And cured in a 0.05% aqueous potassium hydroxide solution (liquid temperature: 23 ° C.) for 1 minute to carry out alkali development to laminate a transparent resin coating film.

On the transparent resin coating film, as an adhesive layer, Noland NOA61 (manufactured by Norland Co.) was applied by spin coating to form a film having a thickness of 10 μm after drying, and then an ethylene layer was formed on the adhesive layer. -Vinyl alcohol copolymer film (EVAL, manufactured by Kuraray Co., Ltd., film thickness 5)
0 μm and a refractive index of 1.50) were laminated by a transfer method, bonded, and the temporary substrate was peeled off.

The laminate composed of the transparent resin coating film, the adhesive layer and the resin film has a thickness of 65 μm, and its variation range is ±
0.75%, and the surface roughness of the laminate is 0.07 μm,
The retardation was 50 nm, and the difference between the refractive index of the laminate and the refractive index of the hologram color filter was 0.002.

An ITO electrode was formed on this laminate in the same manner as in Example 1 to produce a fourth hologram color filter of the present invention.

Using the fourth hologram color filter, a color liquid crystal display was manufactured and operated in the same manner as in Example 1, and a color liquid crystal display having excellent color reproducibility was obtained.

(Example 5) P as a hologram recording material
ET film (1) (film thickness 25 μm) / hologram sensitive material (film thickness 6 μm) / polyvinyl alcohol layer (film thickness 5 μm)
m) / PET film (2) (film thickness: 50 μm), a hologram recording film (20 μm thickness, manufactured by DuPont) was placed on a 1.1 mm-thick glass substrate (AL material manufactured by Asahi Glass Co., Ltd.). Then, the PET film (1) was peeled off and laminated from the light-sensitive material side, and then the PET film (2) was removed, followed by hologram exposure to produce a hologram color filter.

On this hologram color filter, a solvent-free resin compound having the following composition: monomer (Aronix M-150: manufactured by Toa Gosei Chemical Co., Ltd.) 25 parts by weight monomer (Aronix M-5600) : Toa Gosei Chemical Co., Ltd.) 25 parts by weight Urethane acrylate (Shikko UV-3000B: manufactured by Nippon Synthetic Chemical Co., Ltd.) 50 parts by weight Monomer (HK-2: Toa) 1 part by weight Photoinitiator (Irgacure 184: Ciba Specialty Chemicals) ... 4 parts by weight by spin coating (500 rpm) to a film thickness of 60 µm.
m, and then cured by irradiating ultraviolet rays for 10 seconds using a 2.0 kW ultra-high pressure mercury lamp, and a transparent resin coating film was laminated.

The transparent resin coating film has a thickness of 60 μm, a variation range of ± 0.30%, and a surface roughness of 0.0
6 μm, the retardation is 75 nm, and the difference between the refractive index of the resin film and the refractive index of the hologram color filter is 0.003.
Met.

An ITO electrode was formed on the transparent resin coating film in the same manner as in Example 1 to produce a hologram color filter.

Using this hologram color filter, a color liquid crystal display was manufactured and operated in the same manner as in Example 1, and a color liquid crystal display having excellent color reproducibility was obtained.

[0080]

As is apparent from the above description, the hologram color filter of the present invention can be used as a spacer.
This is a hologram color filter that has good dimensional accuracy and flatness compared to conventional glass thin plates, and can be manufactured easily, with good yield, and with high productivity.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a first hologram color filter of the present invention.

FIG. 2 is a diagram for explaining a second hologram color filter of the present invention.

FIG. 3 is a diagram for explaining a third hologram color filter of the present invention.

FIG. 4 is a diagram for explaining a fourth hologram color filter of the present invention.

FIG. 5 is a sectional view of a color liquid crystal display device using a hologram color filter according to the present invention.

[Explanation of symbols]

1 is a hologram color filter, 1R, 1G and 1B are pixels, 2 is a hologram color filter layer, 3 is an oxygen blocking film, 4 is an adhesive layer, 5 is a transparent resin film, 6 is a transparent resin coating film, and 11 to 13 are A transparent glass plate, 14 is a liquid crystal layer, and 15 is a transparent electrode.

Claims (6)

[Claims] 1. A holographic color filter in which a spacer made of a transparent resin film is laminated on a holographic color filter formed on a glass substrate, and a transparent electrode is further laminated on the spacer. , A light beam incident from a predetermined direction is selectively diffracted into two or more different wavelength regions, and condensed at different discrete points adjacent to each of the different wavelength regions and arranged at a fixed distance from the hologram surface. A hologram color filter, wherein the spacer transmits diffracted condensed light to the vicinity of the transparent electrode. 2. A holographic color filter comprising: a holographic color filter formed on a glass substrate; a spacer composed of a transparent resin film and a transparent resin coating film sequentially laminated; and a transparent electrode further laminated on the spacer. The holographic color filter selectively diffracts a light beam incident from a predetermined direction for each of two or more different wavelength regions, and is adjacent to each of the different wavelength regions, and is an array of a certain distance from the hologram surface. A hologram color filter, wherein light is condensed at different discrete points, and the spacer transmits diffracted condensed light near the transparent electrode. 3. The hologram color according to claim 1, wherein when the transparent resin film is laminated on the holographic color filter formed on the glass substrate, the transparent resin film is laminated via an adhesive layer. filter. 4. A holographic color filter comprising a holographic color filter formed on a glass substrate, a spacer made of a transparent resin coating film laminated thereon, and a transparent electrode further laminated on the spacer. Selectively diffracts a light beam incident from a predetermined direction for each of two or more different wavelength regions, and converges at each of discrete spots adjacent to each of the different wavelength regions and at a certain distance from the hologram surface. A hologram color filter, wherein the hologram color filter emits light, and the spacer transmits diffracted condensed light to the vicinity of the transparent electrode. 5. A holographic color filter comprising a holographic color filter formed on a glass substrate, a spacer comprising a transparent resin film and a transparent resin film laminated in this order, and a transparent electrode further laminated on the spacer. The holographic color filter selectively diffracts a light beam incident from a predetermined direction for each of two or more different wavelength regions, and is adjacent to each of the different wavelength regions and has an array shape at a certain distance from the hologram surface. A hologram color filter, wherein light is condensed at another discrete point, and the spacer transmits diffracted condensed light to the vicinity of the transparent electrode. 6. The spacer laminated on the holographic color filter has a surface roughness of 0.1 μm or less, a retardation of 100 nm or less, and a difference in refractive index between the spacer and the holographic color filter of 0.
The hologram color filter according to claim 1, wherein the number is 1 or less.