JPH0571994A - Manufacture of stereoscopic image display device - Google Patents

Abstract

(57) [Summary] [Purpose] The cross-sectional shape is trapezoidal or stepwise,
Provided is a method for manufacturing a stereoscopic image display panel capable of forming stereoscopic images having different heights at predetermined positions on a substrate with good reproducibility. [Structure] The photocurable resin layer 2 formed on the substrate 1
A three-dimensional image pattern is formed at a predetermined position on the substrate 1 by exposing, curing, and developing the photomask 4a to remove the uncured portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stereoscopic image display panel in which a predetermined image pattern is formed at a predetermined position on a substrate.

Such a display panel can be used for, for example, a vehicle meter or a display panel.

[0003]

2. Description of the Related Art Conventionally, images such as letters and numbers on a display board are often formed on a substrate by printing, and are generally flat images.

However, in recent years, as the trend toward higher grades has increased, in order to give a high-class feeling to images such as these letters and numbers, studies have been conducted to convert the images from flat ones to three-dimensional ones. ing.

Moreover, it is desirable that the three-dimensional image formed on the display board has a trapezoidal or stepped cross-sectional shape from the viewpoint of decorativeness and visibility. As a method for making the image on the display board three-dimensional, thick-walled printing, transfer of irregularities by hot stamping, and the like are conceivable, but all of them have drawbacks that the image forming method is complicated and mass productivity is poor.

As another method for forming a three-dimensional image such as letters and numbers on a display board, a photocurable resin layer is formed on a substrate and the photocurable resin layer is exposed through a photomask. JP-A-2-122220 proposes a method of forming a predetermined three-dimensional image on a substrate by curing and removing the uncured portion.

According to the above-mentioned method, for the portion where the high convex portion is formed, the light transmittance of the photomask is increased to increase the curing degree of the photocurable resin, and the portion where the low convex portion is formed is increased. On the other hand, by lowering the light transmittance of the photomask and lowering the photocurable resin, the solubility in the developing solution is adjusted, and the height of the cross-sectional shape of the convex portion is increased to obtain a three-dimensional image. It is the one to be formed.

However, the photocurable resin is generally
Even if it is not completely cured, the portion that has reached a certain level of curing degree will not be removed by development, so it is difficult to control the height of the convex portion by increasing the curing degree above this level. Funny

Further, since the portion where the degree of curing does not reach a certain level is removed by the development, it is difficult to control the height of the convex portion with the degree of curing below this level. Therefore, in the above method, since the height of the convex portion must be controlled within the range of the limited degree of curing of the photocurable resin,
There is a problem that it is difficult to reproducibly form a stereoscopic image having a trapezoidal or stepped cross section and the height of which can be freely controlled.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to obtain a three-dimensional image having a trapezoidal or stepped cross-sectional shape and different heights from a substrate. It is an object of the present invention to provide a method for manufacturing a stereoscopic image display panel that can be formed at a predetermined position above with good reproducibility.

[0011]

A method of manufacturing a stereoscopic image display panel according to the present invention comprises a photocurable resin layer formed on a substrate,
It is premised that a three-dimensional image pattern having a trapezoidal sectional shape or a stepped sectional shape is formed at a predetermined position on the substrate by exposing and curing through a photomask and removing the uncured portion by development.

First, the first invention will be described. In the present invention 1, the photocurable resin layer comprises a photopolymerizable composition comprising a linear copolymer, a photopolymerizable unsaturated compound and a photopolymerization initiator sensitized by actinic rays as a component, The absorption wavelength region is composed of a plurality of layers each containing a different photopolymerization initiator.

The linear copolymer comprises an α, β-unsaturated ethylenic monomer containing a carboxyl group and an α, β-unsaturated ethylenic monomer other than the above.
It is preferable to use a β-unsaturated ethylenic monomer as a constituent. The α, β-unsaturated ethylenic monomer containing a carboxyl group, contains a carboxyl group,
Any monomer that can be copolymerized with the α, β-unsaturated ethylenic monomer may be used, and examples thereof include (meth) acrylic acid, crotonic acid, maleic acid (anhydride), fumaric acid, and itaconic acid. Examples thereof include saturated carboxylic acids.

Examples of the α, β-unsaturated ethylenic monomers other than the above are, for example, styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene and α-
Styrenes such as methylstyrene, p-ethylstyrene, 2,4-dimethylstyrene, pn-hexylstyrene, pn-octylstyrene, p-methoxystyrene, p-phenylstyrene, and 3,4-dimethylchlorostyrene. Vinylnaphthalenes such as α-vinylnaphthalene; ethylene, propylene, butylene or C _{5 to} C ₃₀
And higher α-olefins; vinyl halides such as vinyl chloride, vinyl bromide and vinyl fluoride; vinyl esters such as vinyl acetate, vinyl propionate and vinyl butyrate; methyl (meth) acrylate, (meth ) Propyl acrylate, n-butyl (meth) acrylate, (meth)
Isobutyl acrylate, n-octyl (meth) acrylate, lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-chloroethyl (meth) acrylate, α-chloro (meth) acrylic acid methyl ester, (Meth) acrylic acid esters such as phenyl (meth) acrylate and dimethylaminoethyl (meth) acrylate; vinyl ethers such as vinyl methyl ether and vinyl ethyl ether; vinyl ketones such as vinyl methyl ketone and vinyl ethyl ketone; N -N-vinyl compounds such as vinylpyrrole and N-vinylindole; (meth) acrylonitrile and (meth) acrylic acid amides.

When the amount of the portion corresponding to the α, β-unsaturated ethylenic monomer containing a carboxyl group in the constituents of the linear copolymer becomes small, it becomes insoluble in the alkaline aqueous solution, so that it depends on the alkaline aqueous solution. If it becomes impossible to develop, and if it becomes too large, the compatibility with the coating solvent or other components decreases and the resolution also decreases. Therefore, the range of 10 to 40% by weight is preferable, and 15 to 35% by weight is more preferable. Is.

The amount of the components other than the portion corresponding to the α, β-unsaturated ethylenic monomer containing a carboxyl group in the constituents of the linear copolymer is 60 to 90% by weight.
If the weight average molecular weight of the linear copolymer is small, so-called cold flow is likely to occur, and conversely, if it is large, it becomes difficult to dissolve in an alkaline aqueous solution and it is difficult to develop, and the resolution is lowered. The range of 10,000 to 500,000 is preferable, and the range of 50,000 to 300,000 is more preferable.

The photopolymerizable unsaturated compound used in the present invention is preferably at least one compound selected from the group consisting of compounds represented by the following general formula (I).

[0018]

[Chemical 1]

In the formula (I), R ¹ and R ² are hydrogen groups or methyl groups, n is an integer of 1 to 15, R ³ is a hydrocarbon group of 1 to 10 carbon atoms, and m is 1 to 100. And X is a divalent hydrocarbon group having 2 to 20 carbon atoms.

Here, the divalent hydrocarbon group represented by X is a hydrocarbon group composed of a linear, branched, alicyclic or aromatic moiety, for example, a hexamethylene group or tolylene. Group, isophorone group, tetramethylxylylene group, naphthylene group and the like.

As the method for producing the above-mentioned unsaturated compound, any method may be adopted. For example, diisocyanate and diol are mixed and reacted at a ratio matching the composition ratio of the desired compound, and a urethane oligomer having an isocyanate group at the end is reacted. After forming, the (meth) acrylate having a hydroxyl group may be added and reacted with the isocyanate group at the terminal. At this time, if necessary, the reaction may be carried out by dissolving in an organic solvent such as ethyl acetate, methyl ethyl ketone, or toluene, and a catalyst such as dibutyltin dilaurate may be added.

When the amount of the unsaturated compound in the photopolymerizable resin composition decreases, the flexibility of the photopolymerizable resin composition layer after exposure and development decreases, and when the amount increases, cold flow easily occurs. Since the resolution decreases, it is preferably 5 to 150 parts by weight, and more preferably 10 to 100 parts by weight, relative to 100 parts by weight of the linear copolymer.

The weight average molecular weight of the unsaturated compound is
When it becomes smaller, the flexibility of the resin composition layer after exposure and development decreases, and when it becomes larger, the development time becomes longer.
〜15,000 is preferred, more preferably 1,500
~ 10,000.

The photopolymerization initiator used in the present invention may be any one having a property of absorbing a light beam having a specific wavelength and activating the unsaturated compound to initiate polymerization. Examples of the photopolymerization initiator having a light absorption wavelength range of 250 to 300 nm include benzophenone and
3,4′-dimethyl-4-methoxybenzophenone, methylphenylglyoxylate and the like can be mentioned.

The absorption wavelength range of light rays is 300 to 350.
Examples of the photopolymerization initiator in the range of nm include p-
Dimethylaminobenzoate (2-butoxy) ethyl, 2-
Hydroxy-2-methyl-1-phenylpropane-1-
On, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexylphenyl Examples thereof include ketones and benzyl dimethyl ketal.

The absorption wavelength range of light rays is 350 to 400.
As the photopolymerization initiator in the range of nm, for example, benzoin isopropyl ether, benzoin isobutyl ether, benzine, thioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone,
2,4-diisopropylthioxanthone and the like can be mentioned.

The photopolymerization initiator having a light absorption wavelength range of 400 nm or more includes, for example, camphorquinone. The amount of the photopolymerization initiator in the photopolymerizable resin composition is 0. 0, based on 100 parts by weight of the linear copolymer.
A range of 1 to 10 parts by weight is preferable.

In the photopolymerizable resin composition used in the present invention 1, a photopolymerizable monomer such as tetraethylene glycol diacrylate; dioctyl phthalate, triethylene dioctyl phthalate, triethylene glycol diacetate, p- Plasticizers such as toluenesulfonamide and N-ethyltoluenesulfonamide; hydroquinone, p
-A thermal polymerization inhibitor such as methoxyphenol; a stabilizer; an ultraviolet absorber; an antioxidant; a solvent such as methyl ethyl ketone or toluene may be added.

As the substrate in the present invention 1, for example,
Polycarbonate, polyethylene terephthalate (PE
Sheets or films of T), acrylic resin, etc., glass plates, ceramic plates, metal plates, etc. are preferably used. Further, the base material may be printed in advance.

In the present invention 1, the photocurable resin layer is composed of a plurality of layers containing photopolymerization initiators having different wavelength absorption regions of light rays. As a method of forming the photocurable resin layer on the above-mentioned substrate, when a thick one is molded at once, the solvent contained in the photocurable resin layer is difficult to evaporate, and there is a problem such as foaming when dried at a high temperature. Occurs.

Therefore, the photocurable resin composition is previously formed into a film having a constant thickness by a casting method or the like, and the film is thermocompression-bonded to a substrate using, for example, a laminator. By laminating, a thick photocurable resin composition can be obtained.

When a plurality of photo-curable resin layers are formed on a substrate, a method of film-forming the photo-curable resin composition and sequentially laminating each layer on the substrate, Any method may be adopted in which a curable resin composition is formed into a film and a plurality of layers are laminated together and then thermocompression-bonded on a substrate.

Next, a method of forming a three-dimensional image on the photocurable resin layer will be described. First, as shown in FIG. 1, for example, a photocurable resin layer 2 consisting of three layers A, B, and C containing photopolymerization initiators having different wavelength absorption regions of light rays is formed on the substrate 1. Then, the photocurable resin layer 2
As shown in FIG. 2, a cut-off filter 4a that selectively transmits light rays corresponding to the wavelength absorption region of the layer A and a photomask 3a having a predetermined image pattern are exposed to expose only the layer A. Harden. here,
The cut-off filter 4a activates only the photopolymerization initiator of the A layer and does not activate the photopolymerization initiators of the B layer and the C layer, so that the B layer and the C layer are not cured.

Then, the layer B is exposed through a cutoff filter 4b that selectively transmits light rays corresponding to the wavelength absorption region of the layer B and a photomask 3b having a predetermined image pattern, and as shown in FIG. Selectively cure.

Further, similarly, a cut-off filter 4 which selectively transmits light rays corresponding to the wavelength absorption region of the C layer 4
c and a photomask 3c having a predetermined image pattern, and exposed to selectively cure only the C layer as shown in FIG.

After the photo-curable resin layer 2 consisting of three layers A, B and C is sequentially cured in the order as described above (the cured portion is indicated by hatching), the uncured portion of the photo-curable resin layer 2 is cured. By removing and developing (the portion without hatching), a three-dimensional image 2'having a stepwise cross section can be formed as shown in FIG.

As the exposure light source used in the present invention,
It is not particularly limited, and conventionally known ones can be used, and, for example, an ultrahigh pressure mercury lamp, a metal halide lamp and the like are preferably used.

The developing solution used for developing is not particularly limited, but may be, for example, 0.5.
A sodium carbonate aqueous solution having a concentration of ˜5% by weight is preferably used. The developing device is not particularly limited, and a known device can be used.

Next, the present invention 2 will be described. In the second aspect of the present invention, the photocurable resin layer is composed of a layer containing a photopolymerizable composition composed of a linear copolymer, a photopolymerizable unsaturated compound and a photopolymerization initiator.

In the present invention 2, as the linear copolymer and the photopolymerizable unsaturated compound, those used in the present invention 1 can be used. The amount of the unsaturated compound in the photopolymerizable composition is preferably 5 to 150 parts by weight, more preferably 10 to 100 parts by weight, based on 100 parts by weight of the linear copolymer.

The photopolymerization initiator used in the present invention 2 may be any one having a property of activating the above unsaturated compound by actinic rays such as ultraviolet rays and visible rays to initiate polymerization.

Those activated by ultraviolet rays include:
For example, sulfides such as diphenyl monosulfide and disulfide; xanthones such as thioxanthone and 2-ethylthioxanthone; azo compounds such as hydrazine and azobisisobutyronitrile; benzoin;
Examples thereof include aromatic carbonyl compounds such as benzyl dimethyl ketal.

Examples of those activated by visible light include 2-nitrofluorene and thiomichiller ketone. When the amount of the photopolymerization initiator in the photopolymerizable composition is small, the curing reaction of the photocurable resin layer proceeds, and conversely, when the amount is large, the curing reaction of the photocurable resin layer proceeds with a small amount of light, The resolution is lowered and it becomes difficult to obtain a fine image.

Therefore, the amount of the photopolymerization initiator in the photopolymerizable composition is 0.1 to 100 parts by weight of the linear copolymer.
A range of 10 parts by weight is preferred. In addition, the photopolymerizable resin composition used in the present invention 2 includes a photopolymerizable monomer such as tetraethylene glycol diacrylate; dioctyl phthalate, triethylene glycol diacetate, p-toluene sulfonamide, N-ethyltoluene. A plasticizer such as sulfonamide; a thermal polymerization inhibitor such as hydroquinone or p-methoxyphenol; a stabilizer; an ultraviolet absorber; an antioxidant; a solvent such as methyl ethyl ketone or toluene may be added.

As the substrate used in the present invention 2, those used in the present invention 1 can be used. In addition, in the second aspect of the invention, the photocurable resin layer can be formed on the substrate by the method used in the first aspect of the invention.

As the light source for exposure, the developing solution and the developing device used in the second aspect of the present invention, those used in the first aspect of the present invention can be used. Next, a method of forming a three-dimensional image on the photocurable resin layer will be described.

First, on the substrate 1, for example, as shown in FIG. 6, a layer 21a having a low concentration of photopolymerization initiator and a layer 21c having a high concentration of photopolymerization initiator are arranged in this order from the light source side. After the laminated photo-curable resin layer 21 is formed, the photo-curable resin layer 21 is exposed through the photo mask 31, so that in the layer 21a, almost light rays travel straight and correspond to the image pattern of the photo mask 31. To cure. On the other hand, in the layer 21c, curing occurs even with weak light scattered in the layer 21c, so that the curing progresses in a more divergent manner than the image pattern, and the photocurable resin layer 21 has the curing as shown in FIG. In addition, it is possible to form a three-dimensional image 21 'having an inverted cup-shaped cross section.

Next, the present invention 3 will be described. In the present invention 3, the photocurable resin layer contains a photopolymerizable composition comprising a linear copolymer, a photopolymerizable unsaturated compound and a photopolymerization initiator as a component, It is composed of a single layer containing fine particles for scattering or a composite layer in which a layer containing fine particles for light scattering and a layer not containing fine particles for light scattering are laminated.

As the linear copolymer and the photopolymerizable unsaturated compound, those used in the present invention 1 can be used. The amount of the unsaturated compound in the photopolymerizable composition is preferably 5 to 150 parts by weight, more preferably 10 to 100 parts by weight, based on 100 parts by weight of the linear copolymer.

The photopolymerization initiator used in the present invention 3 may be the same as that used in the present invention 2. The amount of the photopolymerization initiator in the photopolymerizable composition is preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the linear copolymer.

Examples of the light-scattering fine particles used in the present invention 3 include fine particles of glass, methyl methacrylate resin, styrene resin, silica and the like. By setting the average particle diameter of the light-scattering fine particles to 5 μm or less, the photocurable resin layer can maintain the transparency that does not hinder the transmission of light.

In the photopolymerizable resin composition used in the present invention 3, a photopolymerizable monomer such as tetraethylene glycol diacrylate; dioctyl phthalate, triethylene glycol diacetate, p-toluene sulfonamide, N -Plasticizers such as ethyltoluenesulfonamide;
A thermal polymerization inhibitor such as hydroquinone or p-methoxyphenol; a stabilizer; an ultraviolet absorber; an antioxidant; a solvent such as methyl ethyl ketone or toluene may be added.

As the substrate in the present invention 3, the present invention 1 is used.
The one used in can be used. The present invention 3
Then, the photocurable resin layer can be formed on the above-mentioned substrate by the method used in the present invention 1. However, when a predetermined thickness cannot be obtained by one photocurable resin layer, for example, A plurality of photo-curable resin layers may be formed on the substrate by laminating them by the thermal laminating method.

Next, a method for forming a three-dimensional image on the photocurable resin layer will be described. First, for example, as shown in FIG. 8, a photo-curable resin layer 22a composed of only a layer containing light-scattering fine particles is formed on the substrate 1, and the photo-curable resin layer 2 is formed.
The light is exposed to light through the photomask 32 having a predetermined image pattern on the light-curing resin layer 22a.
The photocurable resin layer 22a is cured by proceeding while scattering through the inside.

Next, by developing and removing the unexposed portion of the photocurable resin layer 22a, as shown in FIG.
It is possible to form a stereoscopic image 22 'having a trapezoidal sectional shape.

Further, as shown in FIG. 10, the photo-curable resin layer 23 is used as a composite layer of a layer 23a containing no light-scattering fine particles and a layer 22a containing light-scattering fine particles from the photo-mask 33 side. By exposing through 33, the light travels almost straight through the layer 23a containing no light-scattering fine particles, but in the layer 22a containing light-scattering fine particles, the light propagates while scattering to cure each layer, and as shown in FIG. It is possible to form a three-dimensional image 23 'having an inverted cup-shaped cross section.

As the light source for exposure, the developing solution and the developing device used in the present invention 3, those used in the present invention 1 can be used. Next, the present invention 4 will be described.

In the present invention 4, the photocurable resin layer is composed of a layer containing a photopolymerizable composition comprising a linear copolymer, a photopolymerizable unsaturated compound and a photopolymerization initiator.

In the present invention 4, the linear copolymer and the photopolymerizable unsaturated compound used in the present invention 1 can be used, and the photopolymerization initiator used in the present invention 2 can be used. Can be used respectively.

The amount of unsaturated compound in the photopolymerizable composition is
The amount is preferably 5 to 150 parts by weight, more preferably 10 to 100 parts by weight, based on 100 parts by weight of the linear copolymer. Further, the amount of the photopolymerization initiator in the photopolymerizable composition is preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the linear copolymer.

In the photopolymerizable resin composition used in the present invention 4, a photopolymerizable monomer such as tetraethylene glycol diacrylate; dioctyl phthalate, triethylene glycol diacetate, p-toluene sulfonamide, N -Plasticizers such as ethyltoluenesulfonamide;
A thermal polymerization inhibitor such as hydroquinone or p-methoxyphenol; a stabilizer; an ultraviolet absorber; an antioxidant; a solvent such as methyl ethyl ketone or toluene may be added.

As the substrate used in the present invention 4, those used in the present invention 1 can be used. Further, in the present invention 4, the photocurable resin layer can be formed on the substrate by the method used in the present invention 1.

As the light source for exposure, the developing solution and the developing device used in the present invention 4, those used in the present invention 1 can be used. Next, a method of forming a three-dimensional image on the photocurable resin layer will be described.

First, for example, as shown in FIG. 12, a photocurable resin layer 24 is formed on the substrate 1, and then the light scattering plate 6 is formed.
By exposing and curing the photocurable resin layer 24 through the photomask 34 and the photomask 34, a three-dimensional image 24 'having a trapezoidal sectional shape can be formed as shown in FIG.

The light-scattering plate 6 used in the present invention 4 is not particularly limited as long as it has an effect of scattering light in an arbitrary direction, and for example, frosted glass, matte-processed polyethylene terephthalate (PET) film and the like can be used. It is suitable.

Further, either the light scattering plate 6 or the photomask 33 may be on the light source side.

[0067]

EXAMPLES The present invention will be described below based on examples.

(Example 1) [Preparation of unsaturated compound capable of photopolymerization] Hexamethylene diisocyanate 504 g (3 mol) was placed in a 5-liter four-necked flask equipped with a reflux condenser, a dropping funnel, a thermometer and a mechanical stirrer. And 826 g of dry methyl ethyl ketone (MEK) and 1 g of dibutyltin dilaurate (catalyst) as a solvent are added, and 916 g of polyethylene glycol (2 mol, average molecular weight: 458) while stirring.
Was added and the mixture was heated to reflux for 5 hours.

Then, 232 g (2 mol) of 2-hydroxyethyl acrylate was added dropwise, the mixture was refluxed for another 5 hours for reaction, and MEK was evaporated to prepare a photopolymerizable unsaturated compound.

[Preparation of Photopolymerizable Resin Composition] 1) Photopolymerizable resin composition (A) linear copolymer in the wavelength absorption region of 400 nm or more 100 parts by weight (methyl methacrylate / butyl methacrylate / methacrylic acid) = Weight ratio 50/25/25, weight average molecular weight: 150,000) Photopolymerizable unsaturated compound 75 parts by weight Photopolymerizable monomer (tetraethylene glycol diacrylate) 75 parts by weight Photopolymerization initiator (camphorquinone) 2.5 parts by weight The above substances were dissolved in 250 parts by weight of MEK to prepare a solution of the photopolymerizable resin composition. 2) Photopolymerizable resin composition (B) in the wavelength absorption region of 350 to 400 nm The same as the photopolymerizable resin composition of 1) above except that 2.5 parts by weight of benzyl was used as a photopolymerization initiator. Prepared. 3) Photopolymerizable resin composition in the wavelength absorption range of 250 to 300 nm (C) The photopolymerizable resin composition of 1) above except that 2.5 parts by weight of methylphenylglyoxylate is used as a photopolymerization initiator. It was prepared in the same manner as the product.

[Preparation of Photocurable Resin Film] 1) above
Each of the solutions of the photopolymerizable resin compositions of 3 to 3) is cast on a PET film D having a thickness of 500 μm and dried at 80 ° C. for 10 minutes, and then three types having a thickness after drying of 85 μm ( A photocurable resin film of A, B, C) was produced.

[Production of Photocurable Resin Film Laminate] On a substrate 1 of a polycarbonate sheet having a thickness of 500 μm,
The PET film D of the photocurable resin film A is peeled off, two sheets are laminated by a heat laminating method, and then two photocurable resin films B are further laminated on the PET film D in the same manner. Two curable resin films C were laminated to produce a laminate 2 shown in FIG.

However, the uppermost photocurable resin film C
Was laminated with the PET film D attached on the upper side.

[Production of Stereoscopic Image Display Panel] As shown in FIG. 2, a photomask 3a that allows light to pass through only the portions corresponding to characters and scales is placed on the laminated body 2 and cut to shield light rays having a wavelength of 400 nm or less. Through the off filter 4a,
The photocurable resin film A was cured by irradiating it with a light having an intensity of 300 mJ / cm ^{2 with} a 3 KW ultra-high pressure mercury lamp.

Then, as shown in FIG. 3, a photomask 3b is superposed on the laminated body 2 and passed through a cut-off filter 4b which shields light having a wavelength of 300 nm or less, and a light having an intensity of 300 mJ / cm ² by a 3 KW ultra-high pressure mercury lamp. Was irradiated to cure the photocurable resin film B.

Finally, as shown in FIG. 4, a photomask 3c was placed on the laminated body 2, and a light having an intensity of 300 mJ / cm ² was irradiated by a 3 KW ultra-high pressure mercury lamp without using a cutoff filter. The curable resin film C was cured.

After the exposure of the photocurable resin films A, B and C was completed, the PET film D of the laminate 2 was peeled off and developed with an aqueous sodium carbonate solution at 30 ° C. and a concentration of 1% by weight. As shown in FIG. 5, a display board 5 having a stereoscopic image 2 ′ in which portions corresponding to characters and scales are convex was obtained.

(Example 2) [Preparation of photopolymerizable unsaturated compound] In the same manner as in Example 1, a photopolymerizable unsaturated compound was prepared.

[Preparation of Photopolymerizable Resin Composition] Same as Example 1 except that 2.5 parts by weight and 7.5 parts by weight of benzyl methyl ketal were used in place of camphorquinone as the photopolymerization initiator. Then, two kinds of photopolymerizable resin compositions having different concentrations of the photopolymerization initiator were prepared.

[Preparation of Photocurable Resin Film] A solution of the above-mentioned two kinds of photopolymerizable resin compositions was applied to a P of 500 μm thickness.
After casting on an ET film and drying at 80 ° C. for 10 minutes, two types of photocurable resin films each having a thickness after drying of 100 μm and different photopolymerization initiator concentrations were produced.

[Production of Photocurable Resin Film Laminate] On a polycarbonate sheet substrate 1 having a thickness of 500 μm,
As shown in FIG. 6, first, the PET film of the photocurable resin film 21c having the higher concentration of the photopolymerization initiator is peeled off, and the two are laminated by a thermal laminating method.
On top of that, the PET film of the photocurable resin film 21a having the lower concentration of the photopolymerization initiator was peeled off, and the three sheets were laminated by a thermal lamination method to prepare a laminate 21 having a thickness of 500 μm. However, the uppermost photocurable resin film 21a was laminated with the PET film 21b attached on the upper side.

[Preparation of Stereoscopic Image Display Panel] The laminate 21
As shown in FIG. 6, a photomask 31 that allows light to pass through only the portions corresponding to the characters and the scale is overlaid, and a light beam having an intensity of 1000 mJ / cm ² is irradiated by an ultra-high pressure mercury lamp. And 21c were cured.

Next, the PET film 21 of the laminated body 21
A display panel having a stereoscopic image 21 'in which portions corresponding to letters and scales are convex as shown in FIG. 51 was produced.

(Example 3) [Preparation of photopolymerizable unsaturated compound] In the same manner as in Example 1, a photopolymerizable unsaturated compound was prepared.

[Preparation of Photopolymerizable Resin Composition] 2.5 parts by weight of benzyl methyl ketal was used in place of camphorquinone as a photopolymerization initiator, and glass beads (average particle size 1.0 μm) were used as light scattering particles. A photopolymerizable resin composition was prepared in the same manner as in Example 1 except that 20 parts by weight was added.

[Preparation of Photocurable Resin Film] A solution of the photopolymerizable resin composition was cast on a PET film having a thickness of 500 μm and dried at 80 ° C. for 10 minutes. A 100 μm photocurable resin film was produced.

[Production of Photocurable Resin Film Laminate] On a polycarbonate sheet substrate 1 having a thickness of 500 μm,
As shown in FIG. 8, the PET film 22b of the photocurable resin film 22a was peeled off, and five sheets were laminated by a thermal laminating method to prepare a laminated body 22 having a thickness of 500 μm.

However, the uppermost photocurable resin film 22
The layer a was laminated with the PET film 22b attached on the upper side.

[Preparation of Stereoscopic Image Display Panel] The laminate 22
As shown in FIG. 8, a photomask 32 that allows light to pass through only the portions corresponding to the characters and the scale is overlaid, and a light beam having an intensity of 1000 mJ / cm ² is irradiated by an ultra-high pressure mercury lamp. Was cured.

Next, the PET film 22 of the laminated body 22
A display panel having a stereoscopic image 22 'in which portions corresponding to letters and scales are convex as shown in FIG. 9 after peeling off b and developing with an aqueous sodium carbonate solution at a concentration of 1% by weight at 30.degree. 52 was produced.

(Example 4) [Preparation of photopolymerizable unsaturated compound] In the same manner as in Example 1, a photopolymerizable unsaturated compound was prepared.

[Preparation of Photopolymerizable Resin Composition] The photopolymerizable resin composition was prepared in the same manner as in Example 1 except that 2.5 parts by weight of benzylmethyl ketal was used instead of camphorquinone as the photopolymerization initiator. A resin composition was prepared.

[Preparation of Photocurable Resin Film] A solution of the above photopolymerizable resin composition was cast on a PET film having a thickness of 500 μm, dried at 80 ° C. for 10 minutes, and then the thickness after drying was A 100 μm photocurable resin film was produced.

[Production of Photocurable Resin Film Laminate] On a polycarbonate sheet substrate 1 having a thickness of 500 μm,
As shown in FIG. 10, after the two photo-curable resin films 22a produced in Example 3 were laminated by the thermal laminating method, the PE of the photo-curable resin film 23a was formed thereon.
The T film 23b was peeled off, and three sheets were laminated by a thermal laminating method to prepare a laminated body 23 having a thickness of 500 μm.

However, the uppermost photocurable resin film 23
The layer a was laminated with the PET film 23b on the upper side.

[Production of Stereoscopic Image Display Panel] The laminate 23
As shown in FIG. 10, a photomask 33 that allows light to pass through only the portions corresponding to the characters and the scale is overlaid, and a light beam having an intensity of 1000 mJ / cm ² is irradiated by an ultra-high pressure mercury lamp,
The photocurable resin films 22a and 23a were cured.

Next, the PET film 23 of the laminated body 23
11b is peeled off and developed with an aqueous sodium carbonate solution having a concentration of 1% by weight at 30 ° C., and as shown in FIG. 11, a display board having a stereoscopic image 23 ′ in which portions corresponding to characters and scales are convex. 53 was produced.

Example 5 [Preparation of Photopolymerizable Unsaturated Compound] A photopolymerizable unsaturated compound was prepared in the same manner as in Example 1.

[Preparation of Photopolymerizable Resin Composition] The photopolymerizable resin composition was prepared in the same manner as in Example 1 except that 2.5 parts by weight of benzyl methyl ketal was used instead of camphorquinone as the photopolymerization initiator. A resin composition was prepared.

[Preparation of Photocurable Resin Film] A solution of the photopolymerizable resin composition was cast on a PET film having a thickness of 500 μm and dried at 80 ° C. for 10 minutes. A 100 μm photocurable resin film was produced.

[Production of Photocurable Resin Film Laminate] On a polycarbonate sheet substrate 1 having a thickness of 500 μm,
As shown in FIG. 12, the photocurable resin film 24a
5 sheets are laminated by the thermal lamination method to obtain a thickness of 500μ.
A laminate 24 of m was produced.

However, the uppermost photocurable resin film 24
The layer a was laminated with the PET film 24b attached on the upper side.

[Preparation of Stereoscopic Image Display Panel] The laminate 24
As shown in FIG. 12, the ground glass plate 6 is superposed on the lower side of the photomask 34, through which light is transmitted only in the portions corresponding to the characters and the scale, and 1000 mJ / cm ² is applied from above the photomask 34 by an ultra-high pressure mercury lamp. The photocurable resin film 24a was cured by irradiating it with a strong light beam.

Next, the PET film 24 of the laminated body 24
b is peeled off and developed with an aqueous solution of sodium carbonate having a concentration of 1% by weight at 30 ° C., and as shown in FIG. 13, a stereoscopic image 24 ′ in which the portions corresponding to the characters and the scales have a trapezoidal shape.
A display panel 54 having

[0105]

According to the method for producing a three-dimensional image display panel of the present invention, a photocurable resin layer made of a specific photopolymerizable resin composition is formed on a substrate, exposed and cured to form a cross section. Since the shape can be freely selected to be either stepped or trapezoidal, and the height can be freely controlled, a stereoscopic image can be produced with good reproducibility, providing a display panel with excellent decorativeness and visibility. can do.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing three types of photocurable resin layers formed on a substrate and having different light wavelength absorption regions in the present invention.

FIG. 2 is a schematic cross-sectional view showing a state of exposing a photocurable resin layer formed on a substrate in the present invention.

FIG. 3 is an explanatory diagram showing a situation in which a photocurable resin layer formed on a substrate is exposed to light in the present invention.

FIG. 4 is an explanatory view showing a situation in which a photocurable resin layer formed on a substrate is exposed to light in the present invention.

FIG. 5 is an explanatory diagram showing a stepwise stereoscopic image formed on a substrate in the present invention.

FIG. 6 is an explanatory diagram showing a situation in which a photocurable resin layer formed on a substrate and composed of two types of layers having different concentrations of a photoinitiating polymer is exposed in the present invention.

FIG. 7 is an explanatory view showing a trapezoidal three-dimensional image formed on a substrate in the present invention.

FIG. 8 is an explanatory view showing a situation in which a photo-curable resin layer containing light-scattering fine particles formed on a substrate is exposed in the present invention.

FIG. 9 is an explanatory view showing a trapezoidal three-dimensional image formed on a substrate in the present invention.

FIG. 10 is an explanatory view showing a situation in which a photocurable resin layer formed on a substrate and containing a layer containing no light-scattering fine particles and a layer containing light-scattering fine particles is exposed in the present invention.

FIG. 11 is an explanatory diagram showing an inverted cup-shaped three-dimensional image formed on a substrate in the present invention.

FIG. 12 is an explanatory view showing a situation in which a photocurable resin layer formed on a substrate is exposed through a light scattering plate in the present invention.

FIG. 13 is an explanatory diagram showing a trapezoidal three-dimensional image formed on a substrate in the present invention.

[Explanation of symbols]

 1 Substrate 2, 21, 22, 23, 24 Photocurable resin film 3a, 3b, 3c Photomask 31, 31, 32, 33, 34 Photomask 4a, 4b, 4c Cutoff filter 5, 51, 52, 53, 54 Display panel 6 Light scattering plate

Claims (4)

[Claims] 1. A photocurable resin layer formed on a substrate,
A method of manufacturing a display panel, which comprises exposing through a photomask and curing, and removing an uncured portion to form a predetermined image pattern, wherein the photocurable resin layer is a photopolymerization initiator having a different light absorption wavelength range. Composed of a plurality of layers containing
Each photocurable resin layer is irradiated with a light ray corresponding to the absorption wavelength range of the photopolymerization initiator contained in the photocurable resin layer, exposed, and cured to produce a stereoscopic image display panel. Method. 2. A method of manufacturing a display panel, which comprises exposing and curing a photocurable resin layer formed on a substrate through a photomask and removing an uncured portion to form a predetermined image pattern. A method for producing a three-dimensional image display panel, wherein the curable resin layer is composed of a plurality of layers having different concentrations of a photopolymerization initiator, and the photocurable resin layer is exposed and cured. 3. A photocurable resin layer formed on a substrate,
A method of manufacturing a display panel, which comprises exposing through a photomask, curing, and removing an uncured portion to form a predetermined image pattern, wherein the photocurable resin layer is a single layer containing light-scattering fine particles, or A method for producing a stereoscopic image display panel, comprising a composite layer in which a layer containing light-scattering fine particles and a layer not containing light-scattering fine particles are laminated, and the light-curable resin layer is exposed and cured. .. 4. A method of manufacturing a display panel, which comprises exposing a photo-curable resin layer formed on a substrate through a photo mask to expose and cure it, and removing an uncured portion to form a predetermined image pattern. A method for producing a stereoscopic image display panel, which comprises exposing the curable resin layer through a light scattering plate to cure the resin layer.