JPH07128741A - Reflection type screen - Google Patents

Abstract

PURPOSE:To obtain such a screen that influences of external light can be reduced as much as possible and even a large-size screen can be rolled up without any problems. CONSTITUTION:A polarizing film 13 consists of fine polarizing chips 15 adhered with a light-absorbing black matrix 16 which surrounds each chip. Since the incident light R, G, B of an image is linearly polarized light, it is transmitted through the polarizing film 13, reflected by the metallic reflecting layer 12, then again transmitted through the same polarizing film 13 and observed. In this process, most of the external light is absorbed by the polarizing film 13 and the light-absorbing black matrix 16. Thereby, the influence of external light is hardly given so that bright images can be obtd. Further, since the polarizing film 13 is an assembled body of fine polarizing chips 15, no strain is produced even when the screen is rolled up. Thus, no deterioration of polarizing characteristics is caused. Thus, a large-size screen can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to color separation of light from a light source, irradiating each liquid crystal panel forming a predetermined image, synthesizing linearly polarized light passing through the liquid crystal panel, and projecting the combined light on a screen. In a projection type liquid crystal projection for displaying a predetermined image, the present invention particularly relates to improvement of a large screen.

[0002]

2. Description of the Related Art Generally, the screen surface of a reflective screen 10 has a white surface, a glass bead surface, a metallic surface, or the like. In the projection type liquid crystal projection, the glass bead surface is generally used because it is necessary to efficiently reflect the reflected light in a specific direction. However, such a screen surface reflects external light as well as a predetermined color image from the projector, so that the image is difficult to see in a bright environment. That is, a clear image cannot be obtained in a bright environment.

Recently, a reflection type screen 10 having a three-layer structure has been put into practical use in which half of the external light is blocked to reduce the influence of the external light and display a clear image. As shown in FIG. 5, a metal reflection layer 12 is formed on a base material 11, and a deflection film 13 and a diffusion film 14 are laminated on the metal reflection layer 12. In such a configuration, R from the projection type liquid crystal projection main body,
G, B image light is linearly deflected (the deflection direction of the deflection film 13 and the deflection directions of R, G, B image lights are made to coincide)
Therefore, the light is transmitted through the deflection film 13 and the metal reflection layer 1
The light is reflected at 2 and again transmitted through the same polarizing film 13 to be observed. On the other hand, half of the external light is absorbed by the deflection film 13, and the other half is observed in the same manner as the R, G, B image light.

[0004]

However, this type of screen is still affected by half of the external light, and the image is slightly blurred. In addition, the deflection film 13
Since it is a large one, it cannot be rolled up and a large screen cannot be constructed. Because the deflection film 13
If it is bent when it is rolled up, distortion will occur and the deflection characteristics will deteriorate. For this reason, conventionally, the large screen is not bent, and there is a limit to the configuration of the large screen. It is conceivable to connect several deflection films 13 together in order to obtain a large screen, but this is not preferable because the joints are conspicuous.

It is an object of the present invention to obtain a product which can minimize the influence of external light and can be wound up without trouble even on a large screen.

[0006]

According to the present invention, a reflective screen having a multi-layer structure in which a metal reflection layer 12, a deflection film 13, and a diffusion film 14 are laminated on a substrate 11 is used. Is a reflection type screen which is laminated so as to be surrounded by a black matrix 16 of a light absorbing material.

[0007]

[Function] R from the projection type liquid crystal projection main body,
Since the G and B image lights are linearly polarized, the deflection film 1
3 is transmitted, reflected by the metal reflection layer 12 and transmitted through the same deflection film 13 again for observation. At this time, half of the external light is almost absorbed by the polarizing film 13 and the black matrix 16 of the light absorbing material. Therefore, the influence of external light is almost eliminated, and the image becomes clear. Also,
Since the deflection film 13 is an assembly of the minute deflection pieces 15, no distortion is generated even when wound up, and the deflection characteristics are not deteriorated. Therefore, a large screen can be formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a metal reflection layer 12 is formed on a base material 11, and a deflection film 13 and a diffusion film 14 are formed on the metal reflection layer 12.
Is sequentially laminated, but the configuration of the deflection film 13 is different from the conventional one. That is, the deflecting film 13 of the present invention has a structure in which the minute deflecting pieces 15 are bonded to the portion surrounded by the black matrix 16 of the light absorbing material. This minute deflection piece 15 is, for example, as shown in FIG.
As shown in (a) and (b), it is formed into a square shape and attached to a black matrix 16 of a grid-shaped light absorbing material. At this time, the size of the minute deflection piece 15 is set to be approximately the same as one pixel, for example.

In such a structure, since the R, G and B image lights from the projection type liquid crystal projection main body are linearly polarized, they are transmitted through the deflection film 13 and the metal reflection layer 1 is formed.
It is reflected at 2 and again transmitted through the same polarizing film 13 for observation. At this time, half of the external light is the deflection film 13
And is almost absorbed by the black matrix 16 of the light absorbing material. Therefore, the influence of external light is almost eliminated, and the image becomes clear. Further, since the deflection film 13 is an assembly of the minute deflection pieces 15, no distortion is generated even when wound up and the deflection characteristics are not deteriorated. Therefore, a large screen can be formed.

In the above-described embodiment, the minute deflecting piece 15 has a square shape. However, the minute deflecting piece 15 is not limited to this, and may have a circular shape as shown in FIG. 2 or a hexagonal shape as shown in FIG. It can be shaped. Further, in order to enable only the winding while sacrificing the influence of the absorption of the external light, as shown in FIG. 4, the black deflector 16 of the light absorbing material is used as the space 17 and the minute deflecting piece 15 is provided with the transparent adhesive. Bond at 18.

[0011]

As described above, according to the present invention, since the deflecting film 13 is the minute deflecting piece 15, the deflecting characteristic is not deteriorated even if the deflecting film 13 is bent at the time of winding, and a large screen can be constructed. Further, since the deflecting film 13 is constituted by bonding the minute deflecting pieces 15 so as to be surrounded by the black matrix 16 of the light absorbing material, the influence of external light is almost eliminated, and a clear image is obtained even in a bright place outside. .

[Brief description of drawings]

1A and 1B show an embodiment of a reflective screen according to the present invention, in which FIG. 1A is a partially cutaway plan view and FIG. 1B is a sectional view.

FIG. 2 is a plan view showing a second embodiment of the reflective screen according to the present invention.

FIG. 3 is a plan view showing a third embodiment of the reflective screen according to the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the reflection type screen according to the present invention.

FIG. 5 is a cross-sectional view of a conventional reflective screen.

[Explanation of symbols]

Reference numeral 10 ... Reflective screen, 11 ... Substrate, 12 ... Metal reflective layer, 13 ... Polarizing film, 14 ... Diffusing film, 15 ...
Minute deflector, 16 ... Black matrix of light absorbing material,
17 ... space, 18 ... transparent adhesive.

Claims (2)

[Claims] 1. A reflective screen having a multi-layer structure in which a metal reflective layer 12, a deflection film 13, and a diffusion film 14 are laminated on a base material 11, and the deflection film 13 is formed by laminating fine deflection pieces 15. And a reflective screen. 2. The reflection type screen according to claim 1, wherein the deflection film 13 is formed by bonding the minute deflection pieces 15 so as to be surrounded by a black matrix 16 of a light absorbing material.