JP2000329911A - Transflective reflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a semitransmitting reflection type liquid crystal display device in which a bright screen with good visibility can be obtd. even when the screen is observed at an angle to avoid reflection of external light, by constituting a reflection plate to have the distribution of the quantity of reflected light in such a manner that the quantity of reflected light shows max. at an angle shifted by a specified angle or more from the regular reflection angle. SOLUTION: The intensity curve of reflected light depending on reflection angles for the incident light in a certain direction shows the max. at the angle shifted by >=5 deg. from the regular reflection angle. The intensity curve of reflected light depending on reflection angles for the incident light in a certain direction is obtd. by measuring the intensity of reflected light when the incident light from a light source enters the reflection plate at an incident angle θ0 and plotting the intensity of reflected light to the reflection angle θ. As for the brightness of the display screen of the obtd. liquid crystal display device, the number of max. points present at the reflection angles shifted by >=5 deg. from the regular reflection angle θ1 is preferably one or two in the intensity curve of the reflection light depending on reflection angles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transflector.

[0002]

2. Description of the Related Art A liquid crystal display device is used in various fields such as an electronic organizer, a portable information terminal, an amusement device, and a mobile phone, in addition to a notebook type word processor and a notebook type personal computer. As a transflective liquid crystal display device, a transflective liquid crystal display device having a configuration in which a first polarizing plate, a liquid crystal cell, a second polarizing plate, and a transflective plate are arranged in this order is known. Here, as the liquid crystal cell, for example, a twisted nematic type cell, a super twisted nematic type cell, a guest host type cell and the like are used.

However, since all display devices tend to be inferior in visibility from the outermost surface of the display device, for example, an angle at which reflection of external light on the first polarizing plate is avoided, reflection of external light is prevented. There has been a demand for a liquid crystal display device having better visibility even when viewed from an avoided angle.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present inventors have proposed a transflective liquid crystal display device which can provide a bright and good visibility screen even when viewed from an angle where external light is not reflected. As a result of intensive studies to develop a semi-transmissive reflection plate that gives the above, it has been found that such a problem can be solved by using a semi-transmissive reflection plate having a specific reflection light amount distribution, and the present invention has been accomplished.

[0005]

That is, the present invention provides a transparent metal layer, a layer of a mixture of fine particles and resin, and a substrate which are laminated in this order, so that the intensity of reflected light with respect to incident light from one direction is reduced. It is an object of the present invention to provide a semi-transmissive reflection plate characterized in that a reflection angle dependence curve shows a reflection light quantity distribution in which the reflection light quantity is maximized at an angle shifted from the regular reflection angle by 5 ° or more.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The substrate of the present invention is made of, for example, a thermoplastic resin such as polyethylene terephthalate, polyester, polycarbonate, polyacryl, polyolefin, or glass. The thickness of the base material is appropriately selected according to the liquid crystal display device used,
Usually, it is about 10 μm to 5 mm, and may be plate-like, sheet-like or film-like.

The semi-transmissive reflection plate of the present invention has a local maximum value at an angle of 5 ° or more from the regular reflection angle in a reflection angle dependence curve of the intensity of reflected light with respect to incident light from one direction. Here, the reflection angle dependence curve of the intensity of the reflected light with respect to the incident light from one direction is obtained by adding the incident angle (θ) to the reflector (1).
FIG. 1 is a curve measured by irradiating incident light (2) from a light source (5) at 0) and plotting the intensity of the reflected light (3) against the reflection angle (θ) (FIG. 1). In addition,
In terms of the brightness of the display screen of the obtained liquid crystal display device, the specular reflection angle (θ
It is preferable that the number of local maxima appearing at a reflection angle separated from the direction (4) in (1) by 5 ° or more is one or two. Further, the maximum value may be at a reflection angle separated by less than 5 ° from the specular reflection direction (4), but so-called “glare” occurs due to reflection of external light, and the visibility is not sufficiently improved. Due to the tendency, it is preferable that the value does not have a maximum value at less than 5 °.

As a specific example of such a substrate, the following (1)
Or the base material shown in (2) and the like can be mentioned. (1) The substrate surface has a shape in which a triangular prism is adjacent to a ridge line direction and one side surface of the triangular prism is arranged in parallel with the substrate surface, and a cross section perpendicular to the ridge line of the triangular prism is provided. In (1), the angle between one side parallel to the reflecting plate surface of the triangle formed by each triangular prism and the vertex forming the ridge line is 2.
5 ° to 90 °, preferably 2.5 ° to 45 °, more preferably 2.5 ° to 12 °. Substrates in which the triangles are substantially congruent or similar to each other and are oriented in the same direction.

An example of such a substrate will be described with reference to FIGS. On the surface of the substrate, triangular prisms are adjacent in the ridge direction,
The triangular prism has a shape arranged so that one side surface is parallel to the reflecting plate surface (FIG. 2). The triangle formed by each of the triangular prisms in a cross section perpendicular to the ridge line of the triangular prism has an angle (elevation angle, α) between one side parallel to the base material surface and a vertex forming the ridge line of 2.5 ° or more. 90 °.
The apex angle (β) of the triangle is not particularly limited. The shape of each triangle is substantially congruent (FIG. 3). The top of the triangular prism may be at an acute angle or may be rounded and have a smooth shape.

The pitch of the triangle of the cross section, that is, the length (L) of one side of the triangle parallel to the base material surface is not particularly limited.
It is usually 10 μm or more in terms of ease of processing, and preferably in the range of 10 to 500 μm from the viewpoint that visibility is not impaired.

In order to prevent the occurrence of moire fringes due to interference between the pixel pitch of the liquid crystal cell and the triangular pitch of the transflective plate when such a transflective plate is incorporated in a liquid crystal display device, For example, it is practically preferable to match the pixel pitch of the liquid crystal cell with the triangular pitch of the transflective plate, to change the length of the base of adjacent triangles, or to set the triangular pitch to 100 μm or less.

(2) The surface of the substrate has a structure in which concave or convex groups having an asymmetric cross section in at least one direction are densely formed over the entire surface, and each concave or convex is substantially formed. They are arranged in the same shape and in the same direction, and the angle formed by each concave or convex surface is 2.5 ° to 9 °.
A substrate having 0 °, preferably 2.5 ° to 45 °, more preferably 2.5 ° to 12 °.

An example of such a substrate will be described with reference to FIG. The concave or convex formed on such a surface may have an asymmetrical cross section in at least one direction, and the other cross sectional shape may be an asymmetrical shape or a symmetrical shape. . Such a group of concaves or convexes is formed densely over the entire surface of the substrate. The concave or convex tops may be pointed or may be rounded and smooth. Each concave or convex has substantially the same shape. The directions of the concave or convex are substantially the same. The angle between the concave or convex and the horizontal plane is 2.5 ° to 90 °
°. Specific examples of such a concave or convex cross-sectional shape are shown in FIGS.

The substrate surface can be formed by a usual method, for example, the following method. (1) A method in which a negative mold having a desired shape is formed on a roll, and the mold is transferred to the substrate surface by a roll transfer method. (2) A negative mold having a desired shape is formed in a concave shape on a roll, and an ultraviolet curable resin or an electron beam curable resin is applied to fill the negative concave portion, and then the roll is coated with a film-shaped base material. A method of irradiating an ultraviolet ray or an electron beam to cure the ultraviolet curable resin or the electron beam curable resin and to adhere the cured resin to the substrate, and then peeling the substrate together with the cured resin from a roll (JP-A-3-223883, JP-A-6-324205). (3) A solvent casting method in which a negative type is formed on a casting belt, and a desired shape is imparted during casting.

A mixture layer of fine particles and resin is formed on the surface of the substrate. As the fine particles, for example, silica, calcium carbonate or the like, pearl pigments such as synthetic mica or natural mica whose surface is coated with titanium dioxide, plate-like fish scale foil, fine particles having a pearl luster such as hexagonal plate-like basic lead carbonate And inorganic fine particles such as polymethyl methacrylate beads, acrylic beads such as polymethyl methacrylate beads, polystyrene beads such as cross-linked polystyrene beads, polycarbonate beads, melamine / formalin beads, benzoguanamine / formalin beads, and organic silica beads. Is exemplified. The particle size of the fine particles is not particularly limited. For example, when the fine particles are organic fine particles,
It is 50 μm, preferably 1 μm to 20 μm, more preferably 1 μm to 10 μm. Such fine particles are used alone or in combination of two or more.

As the resin, for example, acrylic resin, urethane resin, epoxy resin, polyester resin,
Examples include, but are not limited to, alkyd resins.

Preferred examples of the mixture layer of fine particles and a resin include a (meth) acrylate derivative (a) having one or more (meth) acryloyloxy groups in the molecule, a photopolymerization initiator (b), and an organic solvent. Containing an aggregate obtained from ultrafine colloidal silica (c) dispersed therein and an amine compound (d) capable of coagulating the ultrafine silica, and cured by irradiation with active energy rays. A cured coating layer having surface irregularities is exemplified.

The (meth) acrylate derivative (a) having one or more (meth) acryloyloxy groups in the molecule is a (meth) acrylate having one or more (meth) acryloyloxy groups in the molecule. Monomer [Hereinafter referred to as (meth) acrylate monomer. ], A (meth) acrylate oligomer having two or more (meth) acryloyloxy groups in the molecule [hereinafter referred to as a (meth) acrylate oligomer]. At least one compound having a (meth) acryloyloxy group. In addition,
The (meth) acryloyloxy group means an acryloyloxy group and a methacryloyloxy group, the (meth) acrylate derivative means an acrylate ester derivative and a methacrylate derivative, respectively, and the (meth) acrylate monomer is an acrylate monomer and The methacrylate monomer and the (meth) acrylate oligomer mean an acrylate oligomer or a methacrylate oligomer, respectively.

As the (meth) acrylate monomer,
Monofunctional (meth) acrylate monomer having one (meth) acryloyloxy group in the molecule [hereinafter referred to as monofunctional (meth) acrylate monomer. ], 2 in the molecule
Difunctional (meth) acrylate monomers having two (meth) acryloyloxy groups [hereinafter referred to as bifunctional (meth) acrylate monomers]. And at least 3 in the molecule
Multifunctional (meth) acrylate monomer having a number of (meth) acryloyloxy groups [hereinafter, referred to as a polyfunctional (meth) acrylate monomer. ]. One or more (meth) acrylate monomers can be used.

Specific examples of the monofunctional (meth) acrylate monomer include tetrahydrofurfuryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate,
Hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3
-Phenoxypropyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentenyl (meth) acrylate, benzyl (meth) acrylate, Isobornyl (meth) acrylate, phenoxyethyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, ethyl carbitol (meth) acrylate, trimethylolpropane mono (meth) acrylate, pentaerythritol Mono (meth) acrylate, phenoxy polyethylene glycol (meth) acrylate, as well as carboxyl group-containing (meth) acrylate monomer, -(Meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, carboxyethyl (meth) acrylate, 2- (meth) acryloyloxyethyl succinic acid, N- (meth) acryloyloxy-N ', N'
-Dicarboxy-p-phenylenediamine, 4- (meth) acryloyloxyethyl trimellitic acid and the like. Further, the monofunctional (meth) acrylate monomer includes a vinyl group-containing monomer such as N-vinylpyrrolidone and a (meth) acryloylamino group-containing monomer such as 4- (meth) acryloylamino-1-carboxymethylpiperidine. Is done.

Examples of the bifunctional (meth) acrylate monomer include alkylene glycol di (meth) acrylates, polyoxyalkylene glycol di (meth) acrylates, halogen-substituted alkylene glycol di (meth) acrylates and aliphatic polyol di (meth) acrylates. Representative examples include (meth) acrylates, di (meth) acrylates of an alkylene oxide adduct of bisphenol A or bisphenol F, and epoxy di (meth) acrylates of bisphenol A or bisphenol F.
The present invention is not limited to these, and various types can be used. Specific examples of the bifunctional (meth) acrylate monomer include ethylene glycol di (meth) acrylate,
1,3-butanediol di (meth) acrylate, 1,
4-butanediol di (meth) acrylate, 1,6-
Hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane di (meth) acrylate, pentaerythritol di (meth) acrylate, ditrimethylol propane di (Meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth)
Acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, polytetramethylene glycol di (meth) acrylate, and silicon di ( (Meth) acrylate, hydroxypivalic acid ester neopentyl glycol di (meth) acrylate, 2,2-bis [4- (meth) acryloyloxyethoxyethoxyphenyl] propane,
2,2-bis [4- (meth) acryloyloxyethoxyethoxycyclohexyl] propane, 2,2-bis [4- (meth) acryloyloxyethoxyethoxyphenyl] methane, hydrogenated dicyclopentadienyldi (meth) acrylate And tris (hydroxyethyl) isocyanurate di (meth) acrylate.

Examples of the polyfunctional (meth) acrylate monomer include glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, and pentaerythritol triacrylate. Poly (3) or higher aliphatic polyol such as (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate (Meth) acrylate is a typical example, and poly (meth) acrylate of a halogen-substituted polyol having a valency of 3 or more, and alkylene oxide addition of glycerin are also used. Birds of tri (meth) acrylate, alkylene oxide adducts of trimethylolpropane (meth) acrylate, 1,1,1-tris [(meth)
Acryloyloxyethoxyethoxy] propane, tris (hydroxyethyl) isocyanurate tri (meth)
Acrylates, silicon hexa (meth) acrylate, and the like.

The (meth) acrylate oligomer is a bifunctional or higher polyfunctional urethane (meth) acrylate oligomer [hereinafter, referred to as a polyfunctional urethane (meth) acrylate oligomer. ] Bifunctional or higher functional polyfunctional polyester (meth) acrylate oligomer [hereinafter referred to as polyfunctional polyester (meth) acrylate oligomer]. ] Bifunctional or higher polyfunctional epoxy (meth) acrylate oligomer [hereinafter referred to as polyfunctional epoxy (meth) acrylate oligomer] And the like. (Meta)
One or more acrylate oligomers can be used.

Examples of the polyfunctional urethane (meth) acrylate oligomer include a urethanization reaction product of a (meth) acrylate monomer having at least one (meth) acryloyloxy group and at least one hydroxyl group in one molecule and a polyisocyanate, and polyols. Is reacted with a polyisocyanate, and a urethanization reaction product of an isocyanate compound obtained with a (meth) acrylate monomer having at least one (meth) acryloyloxy group and at least one hydroxyl group in one molecule, and the like.

The (meth) acrylate monomer having at least one (meth) acryloyloxy group and a hydroxyl group in one molecule used in the urethanization reaction includes 2
-Hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, glycerin di (meth) acrylate, trimethylolpropanedi (Meth) acrylate, pentaerythritol tri (meth)
Acrylate, dipentaerythritol penta (meth)
Acrylate and the like.

The polyisocyanate used in the urethanization reaction includes hexamethylene diisocyanate, lysine diisocyanate, isophorone diisocyanate,
Dicyclohexylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, diisocyanates obtained by hydrogenating aromatic isocyanates among these diisocyanates (for example, diisocyanates such as hydrogenated tolylene diisocyanate and hydrogenated xylylene diisocyanate), triphenylmethane Examples thereof include di- or tri-polyisocyanates such as triisocyanate and dimethylenetriphenyltriisocyanate, and polyisocyanates obtained by multiplying diisocyanates.

As the polyols used in the urethanization reaction, generally used are aromatic, aliphatic and alicyclic polyols, as well as polyester polyols and polyether polyols. Usually, aliphatic and alicyclic polyols include 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, neopentyl glycol, trimethylolethane,
Trimethylolpropane, ditrimethylolpropane,
Examples include pentaerythritol, dipentaerythritol, dimethylol heptane, dimethylol propionic acid, dimethylol butyric acid, glycerin, hydrogenated bisphenol A, and the like.

The polyester polyol is obtained by a dehydration condensation reaction between the above polyols and a polybasic carboxylic acid (anhydride). Specific compounds of polybasic carboxylic acids include (anhydride) succinic acid, adipic acid, (anhydride) maleic acid, (anhydride) itaconic acid,
Examples thereof include (anhydride) trimellitic acid, (anhydride) pyromellitic acid, hexahydro (anhydride) phthalic acid, (phthalic anhydride), isophthalic acid, and terephthalic acid. Examples of the polyether polyol include a polyoxyalkylene glycol, and a polyoxyalkylene-modified polyol obtained by reacting the polyol or phenol with an alkylene oxide.

The polyfunctional polyester (meth) acrylate oligomer is obtained by a dehydration condensation reaction of (meth) acrylic acid, polybasic carboxylic acid (anhydride) and polyol. Examples of polybasic carboxylic acids (anhydrides) used in the dehydration condensation reaction include (anhydride) succinic acid, adipic acid, (anhydride) maleic acid, (anhydride) itaconic acid, (anhydride) trimellitic acid, and (anhydro) pyro. Menlitic acid, hexahydro (anhydride) phthalic acid, (phthalic anhydride), isophthalic acid, terephthalic acid and the like can be mentioned. Further, as the polyol used in the dehydration condensation reaction, 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol,
Propylene glycol, neopentyl glycol, trimethylolethane, trimethylolpropane, ditrimethylolpropane, pentaerythritol, dipentaerythritol, dimethylolheptane, dimethylolpropionic acid, dimethylolbutyrionic acid, glycerin,
And hydrogenated bisphenol A.

The polyfunctional epoxy (meth) acrylate oligomer is obtained by an addition reaction between polyglycidyl ether and (meth) acrylic acid. As polyglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether,
Tripropylene glycol diglycidyl ether, 1,
Examples thereof include 6-hexanediol diglycidyl ether and bisphenol A diglycidyl ether.

The photopolymerization initiator (b) starts the curing of the photocurable composition for mat coating by irradiation with active energy rays, and generally known photopolymerization initiators can be used. Specifically, benzoin, benzophenone, benzoin ethyl ether, benzoin isopropyl ether, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropane-1- Examples include, but are not limited to, on, azobisisobutyronitrile, benzoyl peroxide and the like.

In the colloidal silica (c), examples of the organic solvent as a dispersing solvent include methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, ethylene glycol, ethylene glycol monoethyl ether (hereinafter referred to as ethyl). Cellosolve.), Ethylene glycol mono n
Alcohol solvents such as propyl ether, toluene,
Aromatic hydrocarbons such as xylene; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; acetates such as ethyl acetate and butyl acetate; and dimethylacetamide; one or more of these can be used. .

In the present invention, the colloidal silica (c)
The particle size of the ultrafine silica is usually 800 nm or less, preferably about 5 to 600 nm, and the concentration is not particularly limited. For example, the ultrafine silica is prepared in an organic solvent which is easily available as a commercial product. Those containing 20 to 40% by weight can be used. Examples of the commercially available colloidal silica (c) include, for example, methanol silica sol (trade name: silica particle diameter: 10) in which the organic solvent is methyl alcohol.
１５15 nm, solid content: 30% by weight, Nissan Chemical Industries, Ltd.
MA-ST-M [silica particle size: 20 to 25]
nm, solid content: 40% by weight, manufactured by Nissan Chemical Industries, Ltd.] or trade name OSCAL1132 [silica particle size: 10 to 10%.
20 nm, solid content: 30 to 31% by weight, manufactured by Catalyst Chemical Industry Co., Ltd.], and the solvent is ethyl alcohol.
SCAL1232 [silica particle size: 10 to 20 nm, solid content: 30 to 31% by weight, manufactured by Catalyst Chemical Industry Co., Ltd.], trade name OSCAL1 in which the solvent is n-propyl alcohol
332 [silica particle size: 10-20 nm, solid content: 30-
31% by weight, manufactured by Catalyst Chemical Industry Co., Ltd.] or IPA-ST (silica particle size: 10 to 15 nm, solid content: 30% by weight, manufactured by Nissan Chemical Industries, Ltd.) in which the solvent is isopropyl alcohol or Trade name OSCAL1432 [silica particle size: 10 to 20 nm, solid content: 30 to 31% by weight,
Catalyst Chemical Industry Co., Ltd.], trade name NBA-ST [silica particle size: 10 to 15] in which the solvent is n-butyl alcohol
nm, solid content: 20% by weight, manufactured by Nissan Chemical Industries, Ltd.] or trade name OSCAL1532 [silica particle size: 10 to 10%
20 nm, solid content: 30 to 31% by weight, manufactured by Catalyst Chemical Industry Co., Ltd.], and the solvent is ethylene glycol (trade name: EG-ST [silica particle size: 10 to 15 nm, solid content: 2]
0% by weight, manufactured by Nissan Chemical Industry Co., Ltd.], OSCAL1632 (trade name: silica particle size: 10 to 20 nm, solid content: 30 to 31% by weight, manufactured by Catalyst Chemical Industry Co., Ltd.) wherein the solvent is ethyl cellosolve. The solvent is ethylene glycol mono n-propyl ether, trade name NPC-ST [silica particle size: 10 to 15 nm, solid content: 30% by weight, manufactured by Nissan Chemical Industries, Ltd.] or trade name NPC-ST-2 [ Silica particle size: 400 to 500 nm, solid content: 20% by weight,
Nissan Chemical Industry Co., Ltd.], trade name DMAC-ST in which the solvent is dimethylacetamide [silica particle size: 10 to 1
5 nm, solid content: 20% by weight, manufactured by Nissan Chemical Industry Co., Ltd.]
Or, the trade name DMAC-ST-ZL [silica particle size: 7
0-100 nm, solid content: 20% by weight, manufactured by Nissan Chemical Industry Co., Ltd.], and XBA-ST (trade name: silica particle size) in which the solvent is a mixed solvent of xylene and n-butyl alcohol.
10-15 nm, solid content: 30% by weight, manufactured by Nissan Chemical Industry Co., Ltd.], and the solvent is methyl isobutyl ketone. Chemical Industry Co., Ltd.]. Colloidal silica (c) is one or two of these
More than seeds can be used.

Amine compound (d) capable of coagulating ultrafine silica particles [hereinafter referred to as amine compound (d)]. ]
Means from low molecular weight compounds having a plurality of amine structures in the molecule to high molecular weight compounds. Examples of the amine structure include a primary amine structure, a secondary amine structure, and a tertiary amine structure. The plurality of amine structures of the amine compound (d) may be the same or different.

(1) A low-molecular compound having a plurality of amine structures in a molecule is a low-molecular compound having a plurality of amine structures in a molecule having a molecular weight of about 60 to less than about 1000 and It refers to those having two or more amine structures. Specific examples thereof include the following aliphatic polyamines, alicyclic polyamines, aromatic polyamines, and nitrogen-containing heterocyclic polyamines having a plurality of cyclic hindered amine structures in the molecule [hereinafter referred to as cyclic hindered amine compound (1)]
That. And a nitrogen-containing heterocyclic polyamine other than the cyclic hindered amine compound (1).

Aliphatic polyamines Ethylenediamine, propylenediamine, 1,3-diaminopropane, 1,4-diaminobutane, hexamethylenediamine, 2,5-diamino-2,5-dimethylhexane, 2,2,4-trimethylhexa Methylenediamine, N, N-dimethylaminopropylamine, N, N-
Aliphatic diamines such as diethylaminopropylamine and aminoethylethanolamine; diethylenetriamine;
Dipropylene triamine, 1,3,6-tri (methylamino) hexane, bis (hexamethylene) triamine,
N- (3-aminopropyl) -1,3-propanediamine, N- (3-aminopropyl) -N-methyl-1,3
-Aliphatic triamines such as propanediamine; aliphatic tetra- or pentaamines such as triethylenetetramine and tetraethylenepentamine; alkanoldiamines such as N- (aminoethyl) ethanolamine.

Alicyclic polyamine isophoronediamine, bis (4-amino-3-methyldicyclohexyl) methane, bis (4-aminocyclohexyl) methane, mensendiamine, bis (aminomethyl) cyclohexane, 3,9-bis (3 -Aminopropyl) -2,4,8,10-tetraoxaspiro (5,
5) Undecane and the like.

Aromatic polyamine m-phenylenediamine, p-phenylenediamine, m
-Xylylenediamine, bis (4-aminophenyl) methane, bis (4-aminophenyl) sulfone, bis (4
-Amino-3-ethylphenyl) methane and the like.

Cyclic hindered amine compound (1) As the cyclic hindered amine structure, for example, a compound represented by the general formula (A) (Wherein, R ¹ , R ² , R ³ and R ⁴ are the same or different alkyl groups, and R ⁵ is a hydrogen atom, an alkyl group, an acetyl group or an alkoxy group). ,
A divalent residue obtained by removing R ⁵ or a hydrogen atom at the 4-position of the piperidine ring from the monovalent group, represented by the general formula (B): (Wherein, R ¹ , R ² , R ³ , and R ⁴ have the same meanings as described above). Specifically, a 2,2,6,6-tetramethylpiperidyl group,
2,2,6,6-pentamethylpiperidyl group, 4-hydroxy-2,2,6,6-tetramethyl-1-piperidyl group, 2,2,6,6-tetramethyl-1,4-piperidindiyl And the like. Preferred cyclic hindered amine structures include 2,2,6,6-tetramethyl-
4-piperidyl group and 1,2,2,6,6-pentamethyl-4-piperidyl group.

Specific examples of the cyclic hindered amine compound (1) include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate [commercially available under the trade name Sumisorb 577, Sumitomo Chemical Co., Ltd.] Bis (1,2,2,6,6-pentamethyl-4-piperidyl) [manufactured by Sankyo LS-765 as a commercial product, manufactured by Sankyo Co., Ltd.], tetrakis (2,2,6) 6-tetramethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate [commercially available as ADK STAB LA-57, manufactured by Asahi Denka Kogyo KK], tetrakis (1,
2,2,6,6-pentamethyl-4-piperidyl) 1,
2,3,4-butanetetracarboxylate [commercially available as ADK STAB LA-52, manufactured by Asahi Denka Kogyo Co., Ltd.] (mixed 2,2,6,6-tetramethyl-4)
-Piperidyl / tridecyl) 1,2,3,4-butanetetracarboxylate [commercially available as ADK STAB LA-67, manufactured by Asahi Denka Kogyo Co., Ltd.]
2,2,6,6-pentamethyl-4-piperidyl / tridecyl) 1,2,3,4-butanetetracarboxylate [commercially available as ADK STAB LA-62, manufactured by Asahi Denka Kogyo KK], 8 -Acetyl-3-dodecyl-
7,7,9,9-Tetramethyl-1,3,8-triazaspiro [4.5] decane-2,4-dione [commercially available as Sanol LS-440, manufactured by Sankyo Co., Ltd.] And the like, but are not limited thereto.

Nitrogen-containing heterocyclic polyamines other than cyclic hindered amine compound (1) N-aminoethylpiperazine, 1,3-di (4-piperidyl) propane, 2-aminopyridine, 3-aminopyridine, 4-aminopyridine, 2,3-diaminopyridine, 2,5-diaminopyridine, 2,6-diaminopyridine, 2-pyridinemethanamine, 3-pyridinemethanamine, 4-pyridinemethanamine, 4,4'-dipyridyl, 1,3- Di (4-pyridyl) ethylene, vinylpyridine telomer, vinylpyridine oligomer and the like.

(2) A high molecular compound having a plurality of amine structures in a molecule is a high molecular compound having a plurality of amine structures in a molecule having a molecular weight of 1,000 or more and having an average amine structure in the molecule. It refers to two or more nitrogen-containing oligomers or polymers (hereinafter collectively referred to simply as nitrogen-containing polymers). The nitrogen-containing polymer includes an oligomer type or polymer type light stabilizer having an average of two or more cyclic hindered amine structures in the molecule as described above, and a polymerizable light stabilizer having one such cyclic hindered amine structure in the molecule. Polymer [Hereinafter, these are collectively referred to as cyclic hindered amine compound (2). ], A homopolymer of a polymerizable amine, a copolymer of two or more polymerizable amines, a monomer having one or more polymerizable amines and an olefinically unsaturated group (excluding the polymerizable amines). And the like.

As the cyclic hindered amine compound (2), a mixed {1,2,2,6,6-pentamethyl-4-piperidyl / β, β, β ′, β′-tetramethyl-3,9 having a molecular weight of about 2,000 -[2,4,8,10-tetraoxaspiro (5.5) undecane] diethyl} -1,2,2
3,4-butanetetracarboxylate [commercially available as ADK STAB LA-63 or 63P (trade name, manufactured by Asahi Denka Kogyo Co., Ltd.)]
6-tetramethyl-4-piperidyl / β, β, β ′,
β'-tetramethyl-3,9- [2,4,8,10-tetraoxaspiro (5.5) undecane] diethyl}-
1,2,3,4-butanetetracarboxylate [commercially available as ADK STAB LA-68LD, manufactured by Asahi Denka Kogyo KK], 2,2,6,6-tetramethyl-4-
Homopolymer of piperidyl methacrylate [commercially available as ADK STAB LA-87, manufactured by Asahi Denka Kogyo KK], 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate [commercially available Examples thereof include homopolymers of ADK STAB LA-82 (trade name, manufactured by Asahi Denka Kogyo Co., Ltd.), but are not limited thereto.

As the polymerizable amine, a polymerizable monoamine such as a vinyl monomer having one amine structure in a molecule and an isopropenyl monomer having one amine structure in a molecule is preferable. Examples of the polymerizable monoamine include vinyl monomers having a primary amine structure in a molecule such as vinylamine and allylamine; vinyl monomers having a secondary amine structure in a molecule such as diallylamine, N-methylallylamine and N-ethylallylamine; 2-vinylpyridine, 3-vinylpyridine, vinylpyridine such as 4-vinylpyridine, 2-methyl-5-vinylpyridine, 2-vinylpyridine,
Vinyl monomers having a heteroaromatic ring having a nitrogen atom as a heteroatom as a tertiary amine structure in the molecule, such as alkyl-vinylpyridine such as methyl-6-vinylpyridine and 5-methyl-2-vinylpyridine; N-vinyl -2-Pyrrolidone, N-vinylcarbazole, N-acryloylmorpholine and other vinyl monomers having a nitrogen atom as a tertiary amine structure in the molecule and a non-aromatic heterocycle having a substituent at the nitrogen atom Triallylamine, N-methyldiallylamine, N, N-dimethylallylamine, N,
N-dimethylaminoethyl (meth) acrylate, N,
N, N-dialkylaminoalkyl (meth) acrylates such as N-diethylaminoethyl (meth) acrylate, N, N-dimethylacrylamide, N, N-diethylacrylamide, N- [3- (dimethylamino) propyl] methacrylamide And vinyl or isopropenyl monomers having an aliphatic tertiary amine structure in the molecule, but are not limited thereto.

Examples of the monomer having an olefinically unsaturated group (excluding the polymerizable amine) used for copolymerization with the polymerizable amine include 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate. A) acrylate, hydroxyalkyl (meth) acrylate such as 2-hydroxybutyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, alkyl (meth) acrylate such as butyl (meth) acrylate, styrene, vinyl acetate, Acrylonitrile and the like, but are not limited thereto.

Preferred amine compounds (d) include cyclic hindered amine compounds (1) and (2), homopolymers or copolymers of vinyl monomers having a heteroaromatic ring having a nitrogen atom as a hetero atom in the amine structure in the molecule. Coalescing,
And a homopolymer of N, N-dialkylaminoalkyl (meth) acrylate and a copolymer of N, N-dialkylaminoalkyl (meth) acrylate with styrene or hydroxyalkyl (meth) acrylate. Among homopolymers or copolymers of vinyl monomers having a heteroaromatic ring having a nitrogen atom as a hetero atom in an amine structure in the molecule, homopolymers of vinylpyridines such as vinylpyridine and alkyl-vinylpyridine, N , N-dialkylaminoalkyl (meth) acrylate, styrene or a vinylpyridine-based polymer such as a copolymer of hydroxyalkyl (meth) acrylate and vinylpyridines is preferred.

The amount of the photopolymerization initiator (b) used is (meth)
It is generally used in an amount of 1 to 10 parts by weight, preferably 2 to 5 parts by weight, based on 100 parts by weight of the acrylate derivative (a). If the amount of the photopolymerization initiator is more than the above range, the cured film will be colored, and if it is less than the above range, a sufficient curing speed tends to be not obtained.

The mixing ratio of the colloidal silica (c) and the amine compound (d) is usually the same as that of the colloidal silica (c).
The amine compound (d) is used in an amount of 0.5 to 60 parts by weight, preferably 1 to 50 parts by weight, based on 100 parts by weight of the ultrafine silica. If the compounding amount of the amine compound (d) is larger than the above range, it becomes difficult to control the aggregation of the aggregate obtained from the colloidal silica (c) and the amine compound (d), and the cured film has a glossy or uneven appearance. This tends to make it difficult to adjust the surface irregularities, for example, On the other hand, if the amount is less than the above range, aggregates are not sufficiently produced, and there is a tendency that surface irregularities that can provide antiglare properties cannot be obtained.

When the cyclic hindered amine compounds (1) and (2) are used as the amine compound (d), the cyclic hindered amine compounds (1) and (2) can be used as long as the amount is within the above-mentioned range. It also exhibits properties as a light stabilizer and forms a cured film having weather resistance. Further, the cyclic hindered amine compounds (1) and (2) were added to ultrafine silica 1 in colloidal silica (c).
When used in an amount of 12 parts by weight or more with respect to 00 parts by weight, deterioration of the water resistance of the cured film due to the inclusion of silica can be prevented, and conversely, the water resistance can be improved.

The aggregate is blended so that the ultrafine silica is usually 0.5 to 30 parts by weight, preferably 0.5 to 20 parts by weight, based on 100 parts by weight of the (meth) acrylate derivative (a). Just do it. When the weight of the ultrafine silica particles is larger than the above range, the particle size of the aggregates becomes non-uniform, and it becomes difficult to adjust the surface unevenness, for example, the cured film has gloss blur or bumps. If less than the above range,
Agglomerates are not sufficiently produced, and there is a tendency that surface irregularities that can provide antiglare properties cannot be obtained.

The composition forming the mixture layer of fine particles and resin may contain, in addition to such aggregates, an inorganic filler (e) having an average particle diameter of 1 μm or more, preferably 1 to 7 μm. This case is preferable because the target mixed layer can be easily obtained even when coating is performed using a coating device to which a strong shearing force is applied. Such inorganic fillers include, for example, amorphous fine particles such as silica and calcium carbonate, talc, mica, glass flakes, synthetic hydrotalcite and the like, and the like, having a plate-like structure, silicates and carbonates. And a plate-like filler having a chemical composition such as Above all, amorphous silica and plate-like fillers are preferably used from the viewpoints of dispersion stability at the time of mixing with colloidal silica (c) and fineness of surface unevenness of the cured film. When amorphous silica is used as the inorganic filler (e), not only ordinary silica fine powder but also an organic or inorganic surface-treated powder can be used. As a commercially available product, for example, trade name Sylysia 350
[Average particle size: 1.8 μm, Fuji Silysia Chemical Ltd.
Manufactured by Shirohovic 200 [average particle size: 1.
8 μm, organic material surface treatment, Fuji Silysia Chemical Ltd.
Nipseal E-220A (average particle size 1.5 μm, manufactured by Nippon Silica Industry Co., Ltd.), Nipseal SS-50 (average particle size 1.3 μm, organic material surface treatment, Nippon Silica Industry Co., Ltd.) Made), etc.,
It is not limited to these. When a plate-like filler is used as the inorganic filler (e), the plate-like filler may be obtained by any production method. Specific examples of preferred plate-like fillers include trade name L
MS-300 [average particle diameter: 1.3 to 1.6 μm, manufactured by Fuji Talc Kogyo Co., Ltd.], trade name LMS-200 [average particle size of 1.5 to 1.8 μm, manufactured by Fuji Talc Kogyo Co., Ltd.] ,
Trade name LMS-100 [average particle diameter 1.8 to 2.0 μ
m, manufactured by Fujitalc Industries, Ltd.], trade name: High Filler #
5000PJ [average particle diameter: 1.3 to 2.3 μm, manufactured by Matsumura Sangyo Co., Ltd.], trade name Micromica MK-100 [average particle diameter: 1.0 to 5.0 μm, Corp Chemical Co., Ltd.]
Somasif ME-100 (trade name).
0 to 5.0 μm, manufactured by Corp Chemical Co., Ltd.], but is not limited thereto.
In addition, one or more of these inorganic fillers (e) can be used.

When the inorganic filler (e) is used in combination, the mixing ratio of the ultrafine silica of colloidal silica (c) and the inorganic filler (e) is 10% by weight: 90% by weight to 90% by weight: 10% by weight. %, Preferably 20% by weight: 80% by weight to 80% by weight: 20% by weight. If the amount of the ultrafine colloidal silica (c) is less than 10% by weight, fineness of the surface unevenness of the cured film is lost.
The sum of the parts by weight of the ultrafine colloidal silica (c) and the inorganic filler (e) is 0.5 to 50 parts by weight, preferably 0.5 to 30 parts by weight, per 100 parts by weight of the methacrylate derivative (a). It is blended so as to be parts by weight.

The photocurable composition forming the mixture layer of the fine particles and the resin may contain a solvent and various additives such as a thickener, an antioxidant and an ultraviolet absorber.

The photocurable composition forming the mixture layer of fine particles and resin may contain a light stabilizer composed of a compound having one cyclic hindered amine structure in the molecule. Specifically, 4-benzoyloxy-2,2,
6,6-Tetramethylpiperidine [commercially available as SANOL LS-744, manufactured by Sankyo Co., Ltd.], 1- [2-
{3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy} ethyl] -4- {3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionyloxy {-2,2,6,6-tetramethylpiperidine [commercially available under the trade name SANOL LS-26
26, manufactured by Sankyo Co., Ltd.], 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate [commercially available as ADK STAB LA-82, Asahi Denka Kogyo Co., Ltd.]
Manufactured), 2,2,6,6-tetramethyl-4-piperidyl methacrylate [Adeka Stab L as a commercially available product]
A-87, manufactured by Asahi Denka Kogyo Co., Ltd.].

Examples of the solvent include alcohols such as ethyl alcohol, n-propyl alcohol, isopropyl alcohol and n-butyl alcohol, ethylene glycol monomethyl ether, ethyl cellosolve, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monobutyl ether and the like. Alcohol solvents such as alkylene glycol monoalkyl ethers are particularly preferred in view of the dispersion stability of aggregates obtained from colloidal silica (c) and amine compound (d), and aromatic hydrocarbons such as toluene and xylene; Acetates such as ethyl acetate and butyl acetate, and ketones such as acetone and methyl ethyl ketone can also be used.

To form a mixture layer of fine particles and a resin, a (meth) acrylate derivative (a), a photopolymerization initiator (b), colloidal silica (c) and, if necessary, an inorganic filler (e) ), And then add and mix the amine compound (d) to the mixture. In order to produce an aggregate, first, colloidal silica (c) and an amine compound (d) are mixed, and then a (meth) acrylate derivative (a) and a photopolymerization initiator (b) are added to the mixture. It can also be obtained by mixing. The latter method is suitable when using a (meth) acrylate derivative (a) containing an amino group.

As a method of applying the mixture of the fine particles and the resin, any method can be used as long as a desired uniform thickness can be obtained. The direct gravure method, reverse gravure method, die coating method, comma coating method An appropriate material can be selected from known methods such as a kiss coat method, a Meyer bar method, a curtain flow method, a spray method, a spin coat method, and a dipping method according to the properties of the substrate. The thickness of the coating is usually preferably 0.5 to 20 μm, and particularly preferably 1.0 to 10 μm in view of the strength and durability of the coating.

As a method of curing the composition coated with the mixture of the fine particles and the resin using an active energy ray, the composition may be cured by irradiating ultraviolet rays using a normal high-pressure mercury lamp or metal halide lamp.

On the upper surface of the mixture layer of the substrate / fine particles and the resin, a metal having high reflectivity such as aluminum or silver is deposited. The method of depositing such a metal is not particularly limited, and depends on the type of the substrate and the metal to be deposited.
For example, deposition may be performed by a normal deposition method such as a vacuum deposition method, a sputtering method, and an ion plating method. The thickness of the vapor-deposited layer obtained by vapor-deposition is appropriately selected according to the target reflectance, but transparency is essential and 5 nm to 5 nm.
If it is about 0 nm, it shows practically sufficient reflectance and transmittance. Further, a semi-transmissive reflection plate in which a zinc sulfide layer and a metal layer are combined may be used.

When silver is used, it is preferable to provide a protective layer on the upper or lower surface of the vapor deposition layer in order to prevent the deterioration of the vapor deposition layer. As the protective layer, for example, acrylic resin, epoxy resin, polyester resin, urethane resin,
A coating film such as an alkyd resin may be used. Such a coating film can be applied by a usual method such as a roll coating method, a gravure coating method, and a spray coating method. Further, a thin film of an inorganic substance such as SiO ₂ may be formed by an evaporation method or the like. The thickness of the protective layer is usually in the range of about 5 nm to 10 μm.

The transflective plate of the present invention can be used as a transflective polarizer by laminating it on a polarizer using, for example, an acrylic adhesive. By using such a transflective polarizing plate mounted on a liquid crystal display device, a transflective liquid crystal display device having excellent visibility from a direction in which external light is not reflected can be obtained. Examples of the configuration of the transflective liquid crystal display device include a polarizer, a TN cell, a polarizer, and a transflector arranged in this order, a polarizer, a retardation plate, an STN cell, and a polarizer. Examples thereof include a transflective plate arranged in this order, a GH type cell and a transflective plate arranged in this order, but are not limited thereto. Further, in these configurations, a phase difference plate is further provided on the upper surface and / or lower surface of the liquid crystal cell.
One or two or more optical functional films such as a viewing angle compensation film may be arranged. Further, a haze film may be appropriately laminated.

[0062]

The transflective liquid crystal display device using the transflective plate of the present invention, when compared with a conventional transflective liquid crystal display device, has an advantage when viewed from an angle where external light is not reflected. Also, the display screen is bright and has excellent visibility.

[0063]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 A substrate has a shape in which a triangular prism is adjacent to a ridge direction, and one side surface of the triangular prism is arranged so as to be parallel to a horizontal plane of the substrate. The angle (α) formed by one side of the cross section parallel to the horizontal plane of the triangle formed by each triangular prism and the apex forming the ridge is 7.5 °.
And the triangles were substantially congruent with each other and oriented in the same direction (the apex angle (β) of the triangle was 82.5 ° and the repetition pitch (L) was 30 μm). 100 parts of a urethane acrylate oligomer obtained by the reaction of pentaerythritol triacrylate and hexamethylene diisocyanate as the (meth) acrylic acid ester derivative (a), and 1-part as the photopolymerization initiator (b)
5 parts of hydroxycyclohexylphenyl ketone, 8 parts of colloidal silica (c) silica sol IPA-ST (30% by weight of isopropanol dispersion of silica having an average particle diameter of 10 to 20 nm) "manufactured by Nissan Chemical Industries, Ltd." A mixture of fine particles and a resin was produced using 1.6 parts of ADK STAB LA-63P as the compound (d) and 8 parts of Silohobic 100 (silica having an average particle size of 1.4 μm) as the inorganic filler (e). That is, (meth) acrylate derivative (a), photopolymerization initiator (b),
The colloidal silica (c), the inorganic filler (e) and the ethyl cellosolve are mixed, and then the mixture is mixed for 1 hour while gradually adding the amine compound (d) while stirring the mixture with a three-one motor at 400 rpm. The resulting composition was obtained. Ethyl cellosolve was used in such an amount that the nonvolatile content of the resulting composition was 40% by weight.

The composition thus obtained was applied to the reflector substrate by the Meyer bar method to form a coating, dried at 60 ° C. for 5 minutes, and then applied to the substrate in air with a high-pressure mercury lamp ( Eye Cure UE021-403, manufactured by Eye Graphics
C, 500 V, 150 using H02-L41 (2)).
The coating was cured by irradiating ultraviolet rays at a power of 80 W / cm for 5 seconds from a distance of mm to form a mixture layer of fine particles and a resin. Further, aluminum was vapor-deposited on the surface (evaporated film thickness: 20 nm) to obtain a reflection plate (FIG. 2). This reflector was irradiated with light from the direction of the incident angle (θ0) of 45 °, and the reflection angle dependence curve of the reflected light intensity was measured. FIG. 9 shows the results. The angle at which the intensity of the reflected light becomes maximum (maximum value) was + 21 ° from the vertical direction. Specular reflection angle (θ1)
Is 45 °, the deviation from this angle is 24 °.

This reflector is bonded to a polarizing plate (SG made by Sumitomo Chemical Co., Ltd.) via an acrylic adhesive, and a transflective polarizing plate (a polarizing plate and a transflector are laminated in this order). Get) This transflective polarizing plate is referred to as S
A TN cell is mounted on one surface, and a retardation plate (SEF manufactured by Sumitomo Chemical Co., Ltd.) and a polarizing plate (SG manufactured by Sumitomo Chemical Co., Ltd.) are mounted on the opposite surface in this order. Transmission / reflection type STN type liquid crystal display device (polarizing plate, retardation plate and S
A liquid crystal display device in which a TN liquid crystal cell, a polarizing plate, and a transflective plate are arranged in this order is obtained. This transflective STN
When the type liquid crystal display device is driven, it is bright even when viewed from an angle where external light is not reflected, and there is no generation of moiré fringes, and visibility is good.

Example 2 Silicone beads "Tospearl 120" (21.7 parts by weight) and acrylic resin (21.7 parts by weight) were mixed with ethyl cellosolve (100 parts by weight). The mixture was applied to a substrate similar to that used in Example 1 by using a Meyer bar to form a coating, dried at 90 ° C. for 5 minutes, and then dried in air with a high-pressure mercury lamp (Icure UE021 manufactured by Eye Graphics Co., Ltd.).
Using -403C, 500V, H02-L41 (2)), the coating was cured by irradiating ultraviolet rays at a power of 80 W / cm for 5 minutes from a distance of 150 mm to form a mixture layer of fine particles and a resin. Further, aluminum was vapor-deposited on the surface (evaporation thickness: 20 nm) to obtain a transflective plate (FIG. 2). For this transflective plate, the incident angle (θ0) 4
Light was irradiated from a direction of 5 °, and the reflection angle dependence curve of the reflected light intensity was measured. FIG. 9 shows the results. The angle at which the intensity of the reflected light was maximum (maximum value) was + 20 ° from the vertical direction. Since the regular reflection angle (θ1) is 45 °, the deviation from this angle is 25 °.

The transflective plate is bonded to a polarizing plate (SG manufactured by Sumitomo Chemical Co., Ltd.) via an acrylic adhesive to form a transflective polarizing plate (a polarizing plate and a reflecting plate are laminated in this order). Get). This transflective polarizing plate is referred to as S
A TN cell is mounted on one surface, and a retardation plate (SEF manufactured by Sumitomo Chemical Co., Ltd.) and a polarizing plate (SG manufactured by Sumitomo Chemical Co., Ltd.) are mounted on the opposite surface in this order. Transmission / reflection type STN type liquid crystal display device (polarizing plate, retardation plate and S
A TN liquid crystal cell, a polarizing plate and a reflecting plate are laminated in this order). When this transflective STN type liquid crystal display device is driven, it is bright even when viewed from an angle where reflection of external light is avoided, and there is no generation of moire fringes, and visibility is good.

Example 3 Polymethyl methacrylate beads (average particle size: 3 μm) per 100 parts by weight of polyester acrylate resin
After adding 37.5 parts by weight and mixing, the mixture was diluted with ethyl cellosolve so that the resin concentration became 40%. Further, a silicon-based leveling agent and a polymerization initiator were added to obtain a mixed composition. The composition thus obtained was applied to the same substrate as that used in Example 1 by a kiss-touch gravure roll reverse method (roll rotation speed: 75 rpm) to form a coating, dried, and then applied to the substrate. Ultraviolet rays having an intensity of 230 mJ / cm ² were irradiated in air using a high-pressure mercury lamp to cure the coating, thereby forming a mixture layer of fine particles and a resin. Further, aluminum is vapor-deposited on the surface (deposited film thickness 2).
0 nm) to obtain a transflective plate (total light reflectance 58%,
Total light transmittance 9%). The semi-transmissive reflection plate was irradiated with light from a direction at an incident angle (θ0) of 30 °, and a reflection angle dependence curve of the intensity of the reflected light was measured. The angle at which the intensity of the reflected light was maximum (maximum value) was + 15 ° from the vertical direction. Since the regular reflection angle (θ1) is 30 °, the deviation from the angle is 15 °. This reflective plate is bonded to a polarizing plate (SR, manufactured by Sumitomo Chemical Co., Ltd.) via an acrylic adhesive to form a transflective polarizing plate (a polarizing plate and a transflective plate are laminated in this order). Obtained. This transflective polarizing plate is mounted on the lower surface of the STN cell, and a retardation plate (SEF manufactured by Sumitomo Chemical Co., Ltd.) and a polarizing plate (SR manufactured by Sumitomo Chemical Co., Ltd.) are arranged in this order on the opposite surface. To obtain a transflective STN liquid crystal display device (a polarizing plate, a retardation plate, an STN liquid crystal cell, a polarizing plate, and a transflective plate are laminated in this order). When this transflective STN liquid crystal display device is driven, it is bright even when viewed from an angle where reflection of external light is avoided, and there is no generation of moiré fringes, and visibility is good.

[Brief description of the drawings]

FIG. 1 is a diagram showing an incident angle and a reflection angle of a light beam on a reflection plate.

FIG. 2 is a perspective view illustrating an example of a reflection plate.

FIG. 3 is a cross-sectional view in a direction perpendicular to a ridge line of a triangular prism of the reflector shown in FIG. 2;

FIG. 4 is a perspective view showing an example of a reflection plate.

FIG. 5 is a cross-sectional view illustrating an example of a cross section of a reflection plate.

FIG. 6 is a cross-sectional view illustrating an example of a cross section of a reflection plate.

FIG. 7 is a cross-sectional view illustrating an example of a cross section of a reflection plate.

FIG. 8 is a cross-sectional view illustrating an example of a cross section of a reflection plate.

FIG. 9 is a diagram illustrating a reflection angle dependence curve of the intensity of reflected light of the reflector obtained in Example 1, wherein the vertical axis indicates the reflectance, and the horizontal axis indicates the angle.

FIG. 10 is a diagram showing a reflection angle dependence curve of the intensity of the reflected light of the reflector obtained in Example 2, wherein the vertical axis represents the reflectance, and the horizontal axis represents the angle.

[Explanation of symbols]

 1: Reflector 2: incident light 3: reflected light 4: specular reflection direction 5: light source 6: reflector plate α: elevation β: apex

Claims (4)

[Claims] A transparent metal layer, a mixture layer of fine particles and a resin, and a substrate are laminated in this order, and a reflection angle dependence curve of a reflected light intensity with respect to incident light from one direction has a regular reflection angle. A reflection light amount distribution in which the amount of reflected light is maximized at an angle deviated by 5 ° or more from the transflective plate. 2. A transflective polarizing plate comprising the reflecting plate according to claim 1 and a polarizing plate laminated via an adhesive layer. 3. A transflective liquid crystal display device comprising the transflective plate according to claim 1 disposed on the back side of a liquid crystal cell. 4. A transflective liquid crystal display device comprising the transflective polarizing plate according to claim 2 disposed on the back side of a liquid crystal cell.