JPH09114000A - Projection screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a magnified image, projected in light view environment brightly with high contrast by coloring a polarizing layer, constituting the projection screen, with a color tone of black which has transparency and is sort of chromatic. SOLUTION: The reflection type projection screen 1 has a reflecting layer, printed in silver print ink, on one surface of a base material 2 and the polarizing layer 4 which is colored by mixing an achromatic black tone color material 7 slightly containing a chromatic color material and sort of chromatic is formed on the reflecting layer 3. As for the rate of mixing of the color material with the polarizing layer 4, about 45% transmissivity is excellent in terms of the transmissivity of all light beams as a polarizing film, but for the improvement of the screen contrast, <=45% is preferable. On the polarizing layer 4, transparent synthetic resin 6 is provided by coating or laminating to form a light diffusing layer 5 having a fine unevenness light diffusing surface 6a as its surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a projection screen such as a reflection type projection screen or a transmission type projection screen for a projection device such as a video projector, by coloring the polarizing layer of the screen under a particularly bright viewing environment. The present invention relates to a projection screen for displaying a projected magnified image with bright and high contrast.

[0002]

2. Description of the Related Art In recent years, various video projectors have been developed, and it has become possible to easily project a television image on a large screen and enjoy it. However, the screen should not be affected by external light. , Often used in a darkened room.

Recently, a projection screen has been developed which can be observed even in a relatively bright room.
It is being used in various fields.

A bead screen for improving the retroreflective characteristics, a white screen, for increasing the contrast (density difference between the highlight portion and the shadow portion of the projected image) of the above screen and having a brightness that is easier to see. Examples include a screen and a polarizing screen having a polarizing layer for suppressing the influence of outside light (noise light) other than image light.

In these projection screens, the reflective layer has a transparent layer on its reflective surface, and a transmissive screen has a transparent layer.
Each is an achromatic white transparent layer.

[0006]

The above-mentioned white projection screen has no spectral absorption performance and reflects all the light in the visible region with substantially the same spectral reflectance, so that there is no change in the hue of the projected light. However, the color tone of the image on the screen tends to be tinged with white as a whole, and when the screen is used in a bright room, the illumination light and outside light in the room are reflected by the white screen. It is easy to generate noise light.

Therefore, in the reflection type screen, the color tone of the reflection surface or the transparent layer of the reflection surface and the transmission layer of the transmission type screen (screen under natural light not projecting an image, respectively). It is not possible to suppress the generation of noise light by coloring the color or the screen color of the highlight part when an image is projected) in an achromatic and black tone, and imparting light absorption performance to the screen surface. However, the brightness of the screen is reduced due to the decrease in whiteness of the screen, resulting in a dark screen.

An object of the present invention is to provide at least a polarizing layer of a transparent layer or a transmissive layer in which projection image light proceeds, which constitutes a projection screen, with a transparent chromatic color, which is a black color tone. The purpose is to enable a magnified image projected in a bright viewing environment to be displayed with bright and high contrast.

[0009]

The present invention is a projection screen in which the polarizing layer of the projection screen is colored with a transparent chromatic color black color material.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The projection screen of the present invention will be described below in detail according to the embodiments.

FIG. 1 is a side sectional view of a reflection type projection screen 1 according to the first embodiment. The screen 1 has one surface of a base material 2 and a silver printing ink (ink toned with aluminum powder). ) Is formed by printing (or by aluminum vapor deposition or aluminum foil attachment).

On the reflective layer 3, an achromatic color material 7 (a dye or a pigment, or a color material in which these are mixed) containing an achromatic color material and having an achromatic color is used. It is provided with a transparent chromatic colored black polarizing layer 4 mixed and colored.

The polarizing layer 4 is a uniaxially stretched polyethylene terephthalate film which serves as a support (base layer) for the polarizer with an adhesive layer on both sides of the polarizer made of a polyvinyl alcohol film on which iodine is adsorbed. And the like, and the base layer is colored by mixing a black color material 7 (a dye or a pigment or a color material in which these are mixed) having a chromatic color. The polarization axis direction (stretching axis direction) of the polarizer is set to the same direction as the polarization axis orthogonal to the incident optical axis of the projected image.

As the black color material, any single dye of chromatic dyes (blue dyes, green dyes, red dyes, and other chromatic dyes) or any two of them Use a small amount of a mixture of three or more dyes.

The mixing ratio of the coloring material to the polarizing layer 4 is
When defined by the total light transmittance as a polarizing film,
It is preferable that the transmittance is about 45%, but it is preferably 45% or less in order to improve the screen contrast.

As the black coloring material to be used, for example, an anthraquinone-based transparent chromatic-colored black organic dye is used, and as the chromaticity (hue) of the present invention, lightness (L) and hue are used. In (a) and saturation (b),
The a and b values are not 0, but the closer they are to 0, the better the chromaticity.

Further, as the visual hue of the polarizing phase 4 colored with the black color material, an achromatic gray tone obtained by mixing a plurality of transparent color materials such as dyes and pigments Alternatively, it is a black tone, and is not strictly an achromatic color, but is a gray tone or a black tone with a chromatic color.

A transparent synthetic resin 6 is formed on the polarizing layer 4.
A light diffusion layer 5 formed by applying or laminating (resin paint, ink, or film) is provided.

As shown in FIG. 1, the light-diffusing layer 5 has fine irregularities formed on its surface to form a light-diffusing surface 6a, or does not have the light-diffusing surface 6a. A light diffusing property is imparted by mixing a diffusing material (fine powder such as kaolin). In addition, L indicates the incident direction and the emission direction of the image projection light.

FIG. 2 is a side sectional view of the reflection type projection screen 1 according to the second embodiment.

On the polarizing layer 4 colored with the black color material 7 provided on the reflection layer 3, a black color (black or gray color) color material 7 (a dye or a pigment or a color material containing a mixture thereof). The light diffusing layer 5 is formed by applying or laminating a transparent synthetic resin 6 (resin paint, ink, or film) mixed with and colored.

FIG. 3 is a side sectional view of the transmission type projection screen 11 according to the third embodiment.

The screen 11 is provided with a polarizing layer 4 colored with a black color material 7 on one surface of a transparent base material 12.

A transparent synthetic resin 6 is formed on the polarizing layer 4.
A light diffusion layer 5 formed by applying or laminating (paint, ink, or film) is provided.

The substrate 1 on which the light diffusion layer 5 is formed is
One side of 2 may be either glossy (smooth) or matte (fine concavo-convex), but the other side is preferably smooth.

FIG. 4 is a side sectional view of the transmission type projection screen 11 according to the fourth embodiment.
On one surface of the transparent substrate 12, a polarizing layer 4 colored with a chromatic-colored black-tone coloring material 7 is provided, and on the polarizing layer 4, a chromatic-colored black-tone coloring material 7 (dye or pigment or The light diffusing layer 5 is formed by applying or laminating a transparent synthetic resin 6 (resin paint, ink, or film) that is colored by mixing a coloring material mixed with these.

[0027]

EXAMPLES Specific examples of the projection screen of the present invention will be described in detail below.

Example 1 A sheet of polyethylene terephthalate (thickness: 25 μm) having a glossy (smooth) surface is used as a reflection type projection screen substrate.
m, or 25 to 35 μm, or 35 μm or more and 2
00 μm to 300 μm or less) was used.

First, the light reflection layer (thickness: 15) is printed on the entire gloss surface of the base material by a gravure printing method using a silver ink mixed with aluminum powder and dried.
˜30 μm) was formed.

Next, a polyvinyl alcohol film (thickness: 25 to 30 μm) on which iodine was adsorbed was formed on the reflective layer.
A polarizing layer in which a base layer made of a uniaxially stretched polyethylene terephthalate film colored with a black coloring material is mixed on both sides of a polarizer made of The thin film (thickness; 15 μm or less) was attached via a translucent pressure-sensitive adhesive layer. As the black color material, any single dye of chromatic dyes (blue dyes, green dyes, red dyes, and other chromatic dyes), or any one of them 2
A small amount of a dye containing more than one compound was used.

Next, a glossy (smooth) biaxially stretched polypropylene film (thickness: 15 to 25 μm) mixed with a light diffusing material (fine powder of kaolin) was used as a light diffusing layer on the polarizing layer. The reflection type projection screen of the present invention was prepared by laminating by heating or by using an adhesive material and an adhesive material (film thickness: 15 μm or less).

Example 2 As the light diffusion layer, a transparent black-colored glossy (smooth) biaxially oriented polypropylene mixed with a black coloring material and a light diffusion material (kaolin fine powder). A reflective projection screen of the present invention was prepared in the same manner as in Example 1 except that a film (thickness: 15 to 25 μm) was used.

<Example 3> The same procedure as in Example 1 or Example 2 was repeated except that a polyethylene terephthalate sheet having a matte surface (fine unevenness) was used as the reflective projection screen substrate. The reflective projection screen of the present invention was produced.

Example 4 As a polarizing layer, a polyethylene terephthalate film (thickness: 25 μm, or 25 to 35 μm, or 35 to 120 μm) in which a black dye is mixed and then uniaxially stretched to impart a polarizing property is used. A reflective projection screen of the present invention was prepared in the same manner as in Examples 1 to 3 except for the above.

<Example 5> The same as Examples 1 to 4 except that a biaxially oriented polypropylene film having a matte surface (with or without a light diffusing material) was used as the light diffusing layer. Similarly, a reflective projection screen of the present invention was prepared.

<Example 6> A reflective projection screen of the present invention was prepared in the same manner as in Examples 1 to 5 except that polyvinyl chloride was used as the reflective projection screen substrate.

<Example 7> A reflective projection screen of the present invention was prepared in the same manner as in Examples 1 to 6 except that an aluminum vapor deposition layer (deposition film thickness: about 3000 Å) was formed as the reflection layer. Created.

<Example 8> A reflective projection screen of the present invention was prepared in the same manner as in Examples 1 to 6 except that an aluminum foil (about 25 µm) was used as the reflective layer.

<Example 9> As a constituent resin of the light diffusion layer,
Reflection type projection screens of the present invention were prepared in the same manner as in Examples 1 to 8 except that polyvinyl chloride was used.

<Embodiment 10> As a transmission type projection screen substrate, the surface thereof is glossy (smooth).
Polyvinyl chloride sheet (thickness: 100-300μ
m) was used.

First, a uniaxially colored chromatic black color having transparency by mixing a black coloring material on both sides of a polarizer made of a polyvinyl alcohol film having adsorbed iodine via an adhesive layer. The polarizing layer to which a base layer made of a stretched polyethylene terephthalate film was attached was attached via a thin film (film thickness; 15 μm or less) translucent adhesive layer. As the black color material, any single dye of chromatic dyes (blue dyes, green dyes, red dyes, and other chromatic dyes), or two or more of them A small amount of a complex dye was used.

Next, as a light diffusing layer, a glossy (smooth) biaxially oriented polypropylene film (thickness: 15 to 25 μm) mixed with a light diffusing material (fine powder of kaolin) was formed on the above polarizing layer. The reflection type projection screen of the present invention was prepared by laminating by heating or by using an adhesive material and an adhesive material (film thickness: 15 μm or less).

<Embodiment 11> As a transmission type projection screen substrate, a polyvinyl chloride sheet (thickness: 100 to 30) having a matte surface (fine irregularities) on its surface.
The transmission type projection screen of the present invention was prepared in the same manner as in Example 10 except that 0 μm) was used.

<Example 12> The above-mentioned Example 10 or Example 10 was used except that a polypropylene film (thickness: 25 to 35 µm) which was uniaxially stretched and mixed with a black dye to impart a polarizing property was used as the polarizing layer. A transmissive projection screen of the present invention was prepared in the same manner as in Example 12.

<Example 13> The same as Examples 10 to 11 except that a biaxially stretched polyethylene terephthalate film having a matte surface (with or without a light diffusing material) was used as the light diffusing layer. Similarly, a transmissive projection screen of the present invention was prepared.

<Example 14> A transparent black-colored glossy (smooth) biaxially stretched polyethylene containing a black colorant and a light diffuser (fine kaolin powder) as a light diffuser layer. Terephthalate film (thickness: 15-25
.mu.m) was used, but in Examples 10 to 13 above.
A transparent projection screen of the present invention was prepared in the same manner as in.

Example 15 A transparent colored layer is formed by applying a synthetic resin mixed with a black coloring material to the other surface of the base material of the transmission type projection screen prepared in the above-mentioned Examples 10 to 14. Then, a transmissive projection screen of the present invention was prepared.

[0048]

In the projection screen of the present invention, among the constituent layers of the screen, as the transparent polarizing layer in which the projected image light advances, a polarizing layer colored in black with a transparent chromatic color is used. It is possible to eliminate the drawback that the image on the screen is tinged with white as a whole, and even when using the screen in a bright room, noise due to reflection on the screen due to illumination light in the room or outside light It can block light and is effective in improving image contrast.

[Brief description of the drawings]

FIG. 1 is a partial enlarged side sectional view showing a laminated structure of a reflection type projection screen according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged side sectional view showing a laminated structure of a reflection type projection screen according to a second embodiment of the present invention.

FIG. 3 is a partial enlarged side sectional view showing a laminated structure of a transmission type projection screen according to a third embodiment of the invention.

FIG. 4 is a partially enlarged side sectional view showing a laminated structure of a transmission type projection screen according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Reflective projection screen 2 ... Substrate
3 ... Reflective layer 4 ... Polarizing layer 5 ... Light diffusing layer 6 ... Transparent synthetic resin 6a ... Light diffusing surface
7 ... Color material 11 ... Transmission type projection screen 12 ... Transparent base material L ... Incident / emitted light of projected image

Claims (2)

[Claims] 1. A projection screen, characterized in that the polarizing layer of the projection screen is colored with a transparent chromatic-colored black coloring material. 2. The black coloring material having a chromatic color has a spectral absorption performance for visible light in a specific wavelength range.
The described projection screen.