JP2002365731A - Front surface plate for transmission type projection screen and lenticular lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen constituted to degrade a contrast to a lesser extent by improving the hard coating layer on an observer side surface of a transmission type projection screen and reducing the light scattering by external light. SOLUTION: The hard coating layer is provided with an effect of absorbing external light in addition to an AG(anti-glare) technique. Namely, the front surface plate consists of the constitution colored on the observer side surface by dispersing and compounding adequate coloring agents and light diffusive particulates or black light diffusive particulates into the hard coating layer, by which only the excessive external light is absorbed and the transmission type projection screen improved in the contrast is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen for a transmission type projection TV constituted by combining at least a Fresnel lens sheet and a lenticular sheet.
(Hereinafter referred to as a transmission type projection screen).

[0002]

2. Description of the Related Art A transmission type projection screen is
Generally, it is composed of a combination of a Fresnel lens sheet and a lenticular sheet. Depending on the mode of use, a front plate having the function of a protection plate is further disposed on the outermost surface on the observer side.

When the front plate is not provided, a hard coat layer for protecting the screen is provided on a flat surface opposite to the lenticular lens forming surface of the lenticular sheet corresponding to the outermost surface of the screen. It is common to form.

When the front plate is provided, the observer side surface of the front plate is the outermost surface of the screen, so that it is necessary to form a hard coat layer on the surface to protect the screen. .

A hard coat layer formed on the observer side surface of the front plate needs to have sufficient strength to protect the screen, and at the same time, scatters external light to cause the screen to be scattered. Various functions such as an antiglare function for reducing glare and an antistatic function for preventing dirt due to adhesion of dust and the like are required. In general, a technique of adding an antistatic agent has been used to impart an antistatic function.

In order to provide an anti-glare function, a hard
A technique of mixing light diffusing fine particles in a coating solution for forming irregularities on the surface of a hard coat layer (AG; anti-glare) is employed. However, when a large amount of light diffusing fine particles is added to a hard coat layer having a small coating thickness, light scattering occurs on the surface, so that when the screen is observed obliquely, the entire screen becomes white. The problem is that the image is seen and the screen contrast is reduced.

[0007] The contrast is indicated by “brightness / darkness” of a display image viewed on a screen. As described above, when light is scattered by external light (sunlight or indoor illumination light) on the screen surface. The "dark luminance" of the denominator in the above equation also increases, and the overall contrast decreases. In particular, when the image projected from the projector is observed obliquely from the front of the screen where the image light is emitted, the weight occupied by the light scattering is higher than that of the projected image light, and the contrast in the oblique direction is significantly reduced. The cause has not been elucidated in principle, and only phenomena have been confirmed experimentally.However, such a problem is remarkable especially when indoor lighting brightness is low, and compared to Japan. This is more remarkable when viewing a transmission projection TV in a living environment in Europe and the United States where indoor lighting brightness is low.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended to improve the hard coat layer on the surface on the observer side so that light scattering by external light is reduced and the contrast is lowered. It is an object of the present invention to provide a screen having a configuration with a small number of components.

[0009]

In the present invention, the above object is achieved by providing the hard coat layer with an external light absorbing effect in addition to the above-mentioned AG method. That is, in the hard coat layer, a suitable coloring agent and light diffusing fine particles, or black light diffusing fine particles are dispersed and blended, and the surface on the observer side is colored, so that only extraneous external light is emitted. It is an object of the present invention to provide a transmission type projection screen which absorbs and improves contrast. The hard coat layer is formed on the viewer side of the front plate. Alternatively, in a case where the lenticular sheet is disposed on the viewer side without the front plate, the lenticular sheet is formed on the light diffusion layer which is the outermost surface of the lenticular sheet.

According to the first to sixth aspects of the present invention, in a front plate for a transmission type projection screen comprising at least three optical members of a Fresnel lens sheet, a lenticular sheet, and a front plate, the front plate is provided on the viewer side. A colored hard coat layer is formed on the surface to be formed.

According to the invention of claims 7 to 18, in the lenticular sheet constituting the transmission type projection screen in combination with the Fresnel lens sheet arranged on the projector (light source) side, the surface of the lenticular sheet on the viewer side is provided. And forming a colored hard coat layer.

The binder constituting the hard coat layer may be pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, or a mixture thereof. Radiation-curable resins consisting of bodies are preferred.

The colorants dispersed and mixed in the binder include azo dyes, anthraquinone dyes, and the like.
Quinophthalone dyes, methine dyes, condensed polycyclic dyes,
Reactive dyes, carbon black, inorganic pigments titanium white, titanium erotic, iron oxide (red, yellow brown), ultramarine,
Cobalt blue, chrome oxide green, spinel green
Cadmium yellow, cadmium red, organic pigments such as aniline black, phthalocyanine, perylene, and pyrrole.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. <Embodiment 1: Front Plate> The front plate for a transmission type projection screen in the present embodiment uses the above-mentioned radiation curable resin as a binder, the above-mentioned colorant and light diffusing fine particles, or black light diffusing fine particles. Can be obtained by applying a mixture obtained by dispersing and blending on a plastic plate by various coating methods, and then curing by irradiation with ultraviolet rays.

The above-mentioned plastic plate does not need to be colorless and transparent, and may be a light-transmitting colored plastic plate in which a colorant is dispersed and mixed, or a plastic plate in which black light diffusing fine particles are dispersed and mixed. There may be.

The mixing ratio of the colorant dispersed and mixed in the radiation-curable resin is desirably 0.01 to 20 parts by weight.

<Embodiment 2: Lenticular sheet> Further, in the case where a transmissive projection screen is constituted by a combination of a Fresnel lens sheet and a lenticular sheet arranged on the projector (light source) side without using the front plate described above, The lenticular sheet has the function of the front plate. In this case, a colored hard coat layer as described above is formed on the surface of the lenticular sheet on the viewer side.

There are various variations in the method of forming a colored hard coat layer on the surface of the lenticular sheet on the viewer side. Below, according to the drawings,
Variations of various lenticular sheets constituting a transmission type projection screen in combination with the Fresnel lens sheet 1 will be described.

The basic structure of the lenticular sheet will be described with reference to FIG. 1. A semi-cylindrical convex cylindrical lens group is formed on one surface (the Fresnel lens sheet side) of a transparent support 3 by a cured product of a radiation-curable resin. A lenticular lens portion 2 arranged side by side at a pitch of 3 mm or less is formed. On the other flat surface on the side opposite to the lens portion of the transparent support 3, the non-convergence of the semi-cylindrical convex cylindrical lens group is formed. A stripe-shaped light-shielding pattern 4 (black stripe = BS) is formed at a position corresponding to the boundary of each unit lens corresponding to the light part, and a light-transmitting resin is further applied on the light-shielding pattern via an adhesive layer 5. A light-diffusing layer 7 having a structure containing a light-diffusing agent 6 as a binder is formed. And a formed configuration in which the hard coat layer 9 consisting of the colorant 8 mixed dispersed.

In the present embodiment, it is essential that the colorant 8 is dispersed and mixed in the hard coat layer.

In the case of FIG. 1, the light diffusing agent 6 is contained in the hard coat layer 9 in addition to the coloring agent 8.

FIG. 2 shows a light diffusion layer 7 containing a coloring agent 8 in addition to a light diffusion agent 6 in a light transmitting resin serving as a binder.
FIG. 2 is an explanatory diagram relating to a lenticular sheet having a configuration in which a hard coat layer 9 similar to that of FIG. 1 is formed thereon.

FIG. 3 shows a structure in which a hard coat layer 9 similar to that shown in FIG. 1 is formed on a light diffusion layer 7 in which black light diffusing fine particles 10 are dispersed and mixed in a light transmitting resin serving as a binder. It is explanatory drawing which concerns on the lenticular sheet. It is not necessary to change all the light diffusing agents 6 dispersed and mixed in the light diffusing layer 7 into the black light diffusing fine particles 10, and the light diffusing agent 6 (not black) and the black light diffusing fine particles 10 are mixed as desired. May be blended.

FIG. 4 is an explanatory view of a lenticular sheet having a structure in which a hard coat layer 9 in which black light diffusing fine particles 10 are dispersed and mixed in place of the colorant 8 is formed on the light diffusing layer 7. .

FIG. 5 shows a light diffusion layer 7 containing a colorant 8 in addition to a light diffusion agent 6 in a light transmissive resin serving as a binder.
FIG. 5 is an explanatory diagram relating to a lenticular sheet having a configuration in which a hard coat layer 9 similar to that of FIG. 4 is formed thereon.

FIG. 6 shows that a hard coat layer 9 similar to that shown in FIGS. 4 and 5 is formed on a light diffusion layer 7 obtained by dispersing and mixing black light diffusing fine particles 10 in a light transmitting resin serving as a binder. It is explanatory drawing which concerns on the lenticular sheet of the structure comprised.

The light diffusing layer 7 shown in FIGS. 1 to 6 is a light diffusing layer having a structure in which the light diffusing agent 6 and / or the black light diffusing fine particles 10 are dispersed and mixed in a binder.
The light diffusing layer 7 is not limited to these, and is formed by dispersing and mixing a light diffusing agent 6 and / or black light diffusing fine particles 10 on the surface of a light transmitting plastic or a colored light transmitting plastic. May be used. (Not shown)

Acrylic resin, polyurethane resin, polyester resin, polyvinyl chloride resin, polyvinyl acetate resin, polystyrene resin, polycarbonate resin may be used as a binder or a translucent (colored) plastic constituting the light diffusion layer. Resin, polypropylene resin,
A single substance or a mixture selected from a polyarylate resin, a polysulfone resin, a polyethersulfone resin, an epoxy resin, a polyolefin resin, a fluorinated polyimide resin, a norbornene resin, a nylon resin, and the like are preferable. is there.

The binder constituting the hard coat layer 9 may be pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, or A radiation-curable resin composed of a mixture is preferred.

The colorant 8 dispersed and mixed in the binder includes azo dyes, anthraquinone dyes, quinophthalone dyes, methine dyes, condensed polycyclic dyes, reactive dyes, carbon black, and inorganic black. Pigments such as titanium white, titanium erotic, iron oxide (red, yellow brown), ultramarine, cobalt blue, chromium oxide, spinel green, cadmium erotic, cadmium red, organic pigments aniline black, phthalocyanine , Perylene, and pyrrole-based simple substances or mixtures thereof.

Colorant 8 dispersed and mixed in hard coat layer 9
Is added to the radiation curable resin in an amount of 0.01
The hard coat layer 9 preferably has a thickness of 5 to 35 μm.

As the transparent support 3, it is preferable to use a film base made of polyethylene terephthalate resin, polycarbonate resin, polypropylene resin or the like.

The light diffusing agent 6 is appropriately selected irrespective of organic / inorganic, such as silica, calcium carbonate, aluminum hydroxide, acrylic resin, organic silicone resin, polystyrene, urea resin, and formaldehyde condensate.

[0034]

Embodiments of the present invention in which a colored hard coat layer is formed on a front plate will be described below.

<Example 1> Binder for hard coat layer
Dipentaerythritol hexaacrylate (KAYARAD-D manufactured by Nippon Kayaku Co., Ltd.)
PHA) 90 parts by weight, 15 parts by weight of methacryloyloxyethyltrimethylammonium chloride (Kyoeisha light ester DQ-100) as an antistatic agent,
Dimethylol tricyclodecane diacrylate (Kyoeisha Chemical Light Acrylate DCP) as an adhesion monomer
-A) 10 parts by weight, 5 parts by weight of 1-hydroxycyclohexyl phenyl ketone (Irgacure 184 manufactured by Ciba Geigy) as a photoinitiator, and 13 parts by weight of light diffusing fine particles having an average particle size of 5.43 μm and a refractive index of 1.535. In addition, a coloring agent obtained by combining various dyes including an azo dye.
3 parts by weight were mixed and dissolved in methanol, coated on a transparent styrene methacrylate copolymer resin plate with a curtain coater at a thickness of 30 μm, and evaporated to remove the solvent in an oven. By curing by irradiating ultraviolet rays, a front plate for a transmission type projection screen provided with a hard coat layer was obtained.

The obtained front panel for liquid crystal projection screen was mounted on a 43-inch TV set made by Samsung Electronics together with a Fresnel lens sheet and a lenticular sheet to obtain contrast and external light reflectance. It was measured.
The measurement was performed using a BM-7 (manufactured by Topcon Corporation) at the screen front (measuring angle 0 °), measuring angle 30 °, and measuring angle 45 °, respectively, and the angle of contrast and external light reflectance was measured. Dependency evaluation was performed. In contrast measurement, the illuminance at the center of the screen surface was 0 Lx and 20
Each test was performed at 0 Lx.

<Example 2> A front plate for a transmission type projection screen having a hard coat layer was obtained in the same manner as in Example 1 except that the amount of the coloring agent added was 0.75 parts by weight. .

Example 3 A front plate for a transmission type projection screen having a hard coat layer was obtained in the same manner as in Example 1 except that the amount of the coloring agent added was 1.5 parts by weight. .

Comparative Example 1 A front plate for a transmission type projection screen provided with a hard coat layer was obtained in the same manner as in Example 1 except that the colorant was not mixed and dissolved.

<Comparative Example 2> When forming a methacrylate styrene copolymer resin plate, a coloring agent obtained by combining various dyes including an azo dye was used in an amount of 0.002 parts by weight based on 100 parts by weight of the styrene methacrylate copolymer resin. A hard-coat layer was not applied to the colored styrene methacrylate copolymer resin plate obtained by mixing a part of the mixture to obtain a comparative sample of a front plate for a transmission type projection screen. The measurement of the contrast and the external light reflectance was performed in the same manner as in the above Examples and Comparative Examples.

Table 1 shows the results of evaluation of the front plates for transmission projection screens relating to the above <Examples> and <Comparative Examples>. Table 2 shows the ratio of the contrast and the external light reflectance of each <Example> to <Comparative Example 1>.

[0042]

[Table 1]

[0043]

[Table 2]

As is clear from Table 2, in the present invention, the contrast ratio increases and the external light reflectance ratio tends to decrease as the measurement angle increases, as compared with Comparative Example 1. In other words, this shows that the tendency of the screen to appear white when the screen is observed from an oblique direction is suppressed, and a good front panel for transmission type projection screen was obtained.

[0045]

According to the present invention, the hard coat layer on the observer side surface is colored and improved, whereby light scattering due to external light is reduced.
There is provided a transmission type projection screen having a configuration that does not cause a decrease in contrast. In particular, in the present invention, higher contrast and lower external light reflectance are realized as compared with the conventional transmission type projection screen, and the phenomenon that the entire screen, which is a problem when observing the screen from an oblique direction, appears white, is considered. This effect can be solved, and the effect becomes even more remarkable when viewing the transmission projection TV in a living environment in Europe and the United States where the indoor lighting luminance is low.

[0046]

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of the configuration of a lenticular sheet according to the present invention.

FIG. 2 is an explanatory view showing an example of a configuration of a lenticular sheet according to the present invention.

FIG. 3 is an explanatory view showing an example of the configuration of a lenticular sheet according to the present invention.

FIG. 4 is an explanatory view showing an example of a configuration of a lenticular sheet according to the present invention.

FIG. 5 is an explanatory view showing an example of the configuration of a lenticular sheet according to the present invention.

FIG. 6 is an explanatory view showing an example of a configuration of a lenticular sheet according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fresnel lens sheet 2 ... Lenticular lens part 3 ... Transparent support 4 ... Striped light-shielding pattern (black stripe = BS) 5 ... Adhesive layer 6 ... Light diffusing agent 7 ... Light diffusing layer 8 ... Coloring agent 9 ... Hard coat layer

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G02F 1/1335 H04N 5/74 C 5C058 H04N 5/74 G02B 1/10 Z F term (reference) 2H021 BA24 2H042 BA02 BA12 BA15 BA19 2H088 EA12 EA18 HA26 MA02 MA20 2H091 FA27X FA28X FA31X FA50X FB02 LA16 LA17 MA07 2K009 AA15 BB13 BB14 CC09 CC21 CC24 DD02 DD05 EE01 EE03 5C058 DA01 DA02 EA32 EA36

Claims (18)

[Claims] 1. A front plate for a transmission type projection screen comprising at least three optical members of a Fresnel lens sheet, a lenticular sheet, and a front plate, wherein a transparent plastic plate is used as a base material, and a screen observation of the base material is performed. A front plate for a transmission type projection screen, wherein a hard coat layer formed by dispersing and mixing a colorant with a radiation-curable resin as a binder is formed on a surface on the user side. 2. The hard coat layer is formed by dispersing and mixing light diffusing fine particles in addition to a coloring agent to a binder made of a radiation curable resin.
A front plate for a transmission type projection screen as described in the above. 3. A front plate for a transmission type projection screen comprising at least three optical members of a Fresnel lens sheet, a lenticular sheet, and a front plate, wherein a transparent plastic plate is used as a base material, and the screen is on the viewer side. A front plate for a transmission type projection screen, wherein a hard coat layer formed by dispersing and mixing black light diffusing fine particles with a radiation curable resin as a binder is formed on the surface. 4. The transparent projection according to claim 1, wherein a transparent colored plastic plate prepared by dispersing and blending a coloring agent is used as a base material instead of the transparent plastic plate. Front panel for screen. 5. The colorant is an azo dye, an anthraquinone dye, a quinophthalone dye, a methine dye, a condensed polycyclic dye, a reactive dye, carbon black, an inorganic pigment such as titanium white, titanium black, Iron oxide (red, yellow brown), ultramarine, cobalt blue, chromium oxide, spinel green, cadmium yellow, cadmium red, organic pigment aniline black, phthalocyanine, perylene, pyrrol The front plate for a transmission type projection screen according to any one of claims 1 to 4, which is a single substance or a mixture. 6. The radiation-curable resin is a simple substance or a mixture of pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, trimethylolpropane tri (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. The front plate for a transmission type projection screen according to any one of claims 1 to 5, comprising a body. 7. A lenticular sheet constituting a transmissive projection screen in combination with a Fresnel lens sheet disposed on a projector (light source) side, wherein said lenticular sheet is formed by curing a radiation-curable resin on one surface of a transparent support. A lenticular lens portion in which semi-cylindrical convex cylindrical lens groups are juxtaposed at a pitch of 0.3 mm or less is formed by the object, and on the other flat surface on the side opposite to the lens portion of the transparent support,
A stripe-shaped light-shielding pattern is formed at a position corresponding to a boundary of each unit lens corresponding to a non-light-collecting portion of the semi-cylindrical convex cylindrical lens group, and furthermore, light transmission is performed on the light-shielding pattern via an adhesive layer. Light-diffusing layer having a configuration containing a light-diffusing agent using a hydrophilic resin as a binder, and a radiation-curable resin as a binder, and a colorant dispersed and mixed on the surface (observer side) of the light-diffusing layer. A lenticular sheet for a transmission type projection screen, wherein the lenticular sheet has a configuration in which a hard coat layer is formed. 8. The hard coat layer is formed by dispersing and mixing light diffusing fine particles in addition to a coloring agent to a binder made of a radiation-curable resin.
A lenticular sheet for a transmission type projection screen according to the above. 9. The lenticular sheet for a transmission type projection screen according to claim 7, wherein said hard coat layer is obtained by dispersing and mixing black light diffusing fine particles in a binder made of a radiation curable resin. 10. The light diffusing sheet according to claim 1, wherein the light diffusing layer is a light diffusing sheet having a structure in which light diffusing fine particles are dispersed and mixed in a light transmitting colored plastic in which a coloring agent is dispersed and mixed. A lenticular sheet for a transmission type projection screen according to any one of 7 to 9. 11. The light diffusing sheet according to claim 7, wherein the light diffusing layer is a light diffusing sheet having a structure in which black light diffusing fine particles are dispersed and mixed in translucent plastic. A lenticular sheet for a transmission type projection screen according to the above. 12. The light diffusion layer according to claim 1, wherein the light diffusion layer is a light diffusion sheet having a structure in which black light diffusing fine particles are dispersed and mixed in a light transmitting colored plastic in which a coloring agent is dispersed and mixed. A lenticular sheet for a transmission projection screen according to any one of claims 7 to 9. 13. The light-diffusing layer has a structure in which a light-transmitting plastic plate is used as a base material, and at least one surface is coated with an ink obtained by dispersing and mixing light-diffusing fine particles in a binder. The lenticular sheet for a transmission type projection screen according to any one of claims 7 to 9, wherein: 14. An ink comprising a light-diffusing layer and a light-transmitting colored plastic plate in which a coloring agent is dispersed and mixed, and a light-diffusing fine particle dispersed and mixed in a binder on at least one surface. The lenticular sheet for a transmission type projection screen according to any one of claims 7 to 9, wherein the lenticular sheet is configured to be formed by coating. 15. The lenticular sheet for a transmission type projection screen according to claim 13, wherein the light diffusing fine particles dispersed and mixed in the binder are black. 16. The coloring agent may be an azo dye, an anthraquinone dye, a quinophthalone dye, a methine dye, a condensed polycyclic dye, a reactive dye, carbon black, or an inorganic pigment such as titanium white or titanium black. Iron oxide (red, yellow brown), ultramarine, cobalt blue, chromium oxide, spinel green, cadmium yellow, cadmium red, organic pigment aniline black, phthalocyanine, perylene, pyrrol The lenticular sheet for a transmission type projection screen according to any one of claims 7 to 15, comprising a single substance or a mixture. 17. The radiation-curable resin serving as a binder constituting the hard coat layer may be pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol hexa. The lenticular sheet for a transmission type projection screen according to any one of claims 7 to 16, comprising a simple substance or a mixture of (meth) acrylate. 18. An acrylic resin as a binder or a translucent (colored) plastic constituting the light diffusion layer.
Polyurethane resin, polyester resin, polyvinyl chloride resin, polyvinyl acetate resin, polystyrene resin, polycarbonate resin, polypropylene resin,
Claims consisting of a single substance or a mixture selected from polyarylate resin, polysulfone resin, polyethersulfone resin, epoxy resin, polyolefin resin, fluorinated polyimide resin, norbornene resin, nylon resin, etc. Item 18. A lenticular sheet for a transmission projection screen according to any one of Items 7 to 17.