JPH05323260A - Liquid crystal projection type television - Google Patents

Abstract

PURPOSE:To provide the high-resolution display device consisting of low- resolution liquid crystal light valves by providing N-set of liquid crystal projection devices which form images on a screen one over another and providing each of the liquid crystal projection device with pixels which are 1/N as many as pixels that the formed image on the screen requires. CONSTITUTION:The projection lights from six liquid crystal projection devices 1-6 provided behind the screen 7 are put one over another to form one image. Liquid crystal light valves of the six liquid crystal projection devices 1-6 have resolution 1/6 as high as the resolution on the formed image on the screen 7 requires. The lights from the respective liquid crystal projection devices 1-6 are projected, pixel by pixel, successively in order. Consequently, the projection image on the screen 7 has desired resolution. The projection devices can be put in one housing including the screen by using plural mirrors so that the projection lights from the liquid crystal projection devices are not projected directly on the screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projection television (liquid crystal projector).

[0002]

2. Description of the Related Art A light beam emitted from a light source is separated into three primary color components of green, blue and red by a dichroic mirror, and an optical shutter (light valve) for changing the transmittance of liquid crystal according to the luminance information of a video signal is passed through each of them. A liquid crystal projection television is known in which a dichroic mirror is combined and an image is formed on a screen via a lens.

[0003]

However, the technique for improving the resolution in the above-mentioned conventional device is mainly the improvement of the light valve itself, so that it is naturally limited and very expensive. Similarly, there is a limit to the brightness.

Therefore, an object of the present invention is to provide a liquid crystal projection type television which solves the above problems.

[0005]

In order to achieve the above object, the present invention has a screen and N (N is an integer) number of liquid crystal projection devices for superimposing images on the screen to form an image. Each of the liquid crystal projection devices is characterized by having one-Nth of the number of pixels required for the image formed on the screen.

[0006]

According to the present invention, each liquid crystal light valve has a low resolution, while high brightness can be obtained.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Reference numeral 7 denotes a screen on the back of which the projection lights from the six liquid crystal projectors 1 to 6 are superimposed on each other so that one image is formed. Image on. Each of the liquid crystal light valves of the six liquid crystal projectors 1 to 6 has a resolution (pixel number) that is ⅙ of the resolution (pixel number) required for the image formed on the screen 7, and FIG. The pixel arrangement of the projection light from six liquid crystal projectors 1-6 is shown. Each number indicates a pixel in the projection light from the liquid crystal projection device of the same number.

At this time, in this embodiment, the number of liquid crystal projection devices is N = 6, but in general, it is easy to divide m in the horizontal direction and n in the vertical direction to N = m × n. It can be analogized. Further, in the present embodiment, a plurality of liquid crystal projection devices are shown as if they were separate housings for the sake of drawing representation. Instead of directly projecting onto the screen, by using a number of mirrors and projecting the reflected light onto the screen, it is possible to store the screen including the screen in one housing.

With such a configuration, a desired value can be obtained for the resolution of the projected image on the screen 7.

[0011]

As described above, according to the present invention, the following effects can be obtained.

(1) Since a high-resolution display device can be realized with an inexpensive low-resolution liquid crystal light valve, a total low-cost set can be expected even if a plurality of devices are used.

(2) Since a plurality of light sources are used, an inexpensive standard light source can be used. Further, for the same reason, a large amount of light can be obtained and high brightness can be expected.

(3) Furthermore, even if the aperture ratio of the liquid crystal is low,
Apparently, the aperture ratio of N times is compensated.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a diagram showing a pixel array.

[Explanation of symbols]

 1-6 Liquid Crystal Projector 7 Screen

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tomohiro Mihara 4-15-3 Nishishinjuku, Shinjuku-ku, Tokyo Sanseido Shinjuku Building, 4th Floor, Advanced Video Technology Laboratory Co., Ltd. (72) Inventor Hiroyuki Fukumori Shinjuku-ku, Tokyo 4-15-3 Nishi-Shinjuku Sanseido Shinjuku Building 4F Advanced Video Technology Laboratory Co., Ltd.

Claims (1)

[Claims] 1. A screen, and N (N is an integer) liquid crystal projection devices for superimposing images on the screen to form an image, and each of the liquid crystal projection devices forms an image on the screen. A liquid crystal projection television characterized in that it has 1 / N of the pixels required for an image.