JPS59230383A - Projection television system - Google Patents

Abstract

PURPOSE:To allow the viewer to enjoy a television magnified picture with a very inexpensive system by constituting the system with a transmission type TFT active matrix liquid crystal color display element, back light source, an expanding lens system and a projection screen. CONSTITUTION:The light from light sources 8, 9 is given to the transmission type TFT active matrix liquid crystal color display elements 6, 7 via an optical diffusion plate 10 and projected on a screen 13 via magnification lenses 11, 12. Since it is meaningless if two display bodies pick up the entirely identical picture, the display is shared by separating the television signal into one interlace and the other and displayed pictures are overlapped while being more or less shifted so as to produce the interlace effect on the screen 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the configuration of a projection television.

1. An object of the present invention is to provide an inexpensive projection television system.

Conventionally, projection televisions use special expanding beam tubes because it is impossible to display large images directly using a CRT. However, its configuration was complicated and expensive. On the other hand, large-scale projection systems include 80 film projectors, but these cannot display television broadcasts.

The present invention provides a projection television that can enlarge and project television broadcasts at a price comparable to that of the 8 Dragon projector.

The present invention will be explained below based on the drawings.

FIG. 1 is a diagram showing the basic configuration of a projection television system according to the present invention.

Reference numeral 1 denotes a color liquid crystal display device, and since resolution and high definition are particularly required, a TPT active matrix type transmissive color liquid crystal display is used. Reference numeral 2 denotes a light diffusing plate, which allows the light from the light source 3 to enter uniformly.

It also schematically shows a 4/Ii magnifying lens system. A 2-5-screen screen is recommended, but a white wall is also acceptable. The technology for receiving television broadcasting, driving the color liquid crystal display device 1, and displaying a color television image is a separately proposed method, and will therefore be omitted. By making the color liquid crystal display device 1 with a display size of 2 to 3 inches diagonally, it can be mass-produced more efficiently and at a lower cost. Therefore, in order to enlarge this to a size of approximately 1 m×]m, the magnification ratio is 20 to 30 times. This can be done by applying the enlargement method of an 81uI projector. Also, 8
Although a mechanical feed mechanism occupies an important part in both inter-projector and slide projector, the system of the present invention does not require any mechanical moving parts, so the system configuration is very inexpensive.

Therefore, if you install the main unit on the ceiling or the like and project it onto the wall when you use it, it will not take up any indoor space. You can enjoy inexpensive projection TV.

However, the only drawback of the present invention is that the current technology
The problem is that a 3-inch diagonal liquid crystal display cannot have the same resolution as a film. 3- Therefore, the more you enlarge the projected image, the worse the image quality will be.

In order to solve this problem, we propose a method using a plurality of display bodies as shown in FIG. In FIG. 2, 6 and 7 are color liquid crystal display devices, 8 and 9 are light sources, 10 is a light diffusion plate,
11 and 12 are a magnifying lens system and a screen 131d. The light sources 8.9 can also be identical. The resolution of the broadcast TV signal is around 500 lines horizontally and 600 lines vertically.
The number of pixels on the liquid crystal display is 250 x 25
0 or so can be produced easily in mass production, so by superimposing four display images, it is possible to display an image quality close to the original level of a television signal. However, even when two display bodies are used, it is possible to improve the image quality. It would be meaningless if two displays showed exactly the same picture, so for example, one side of the interlaced TV signal and the other are divided to share the display, and on the screen, the displayed image is slightly changed to create an interlaced effect. Shift and overlap. This can be done with a simple mechanical position adjustment mechanism, and it is also easy to divide the television signal into interlaces in terms of circuitry.

Other advantages of a projection television system using a liquid crystal display include less flickering of images due to the memory effect of the liquid crystal, low power consumption, and the ability to use common cheap light sources.

As described above, the projection television system of the present invention is highly effective because it allows the enjoyment of enlarged television images with a very inexpensive system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of a projection television system according to the present invention. 1--Color liquid crystal display device 2--Light diffusing plate 3--Light source 4--Magnifying lens system 5--Screen FIG. 2 shows another example of the basic configuration of the present invention. 6.7... Color liquid crystal display device 8.9... φ light source lO... Light diffusing plate 5-11, 12 #--Magnifying lens system 13/Fist bone screen or above Applicant: Suwa Seikosha Co., Ltd. 61 Procedure amendment Zhan (spontaneous) Patent Application No. 106081 of 1988 2, Name of Invention Gloziection Television System 3, Relationship with the person making the amendment case Applicant 2-4-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo (256) Stock Company: Suwa Seikodai 4, Agent: Tsuneyaguchi Nakamura, Representative Director 6, Specification to be amended, Drawing 7, Contents of amendment (self-proposed) 1. Line 3 from the bottom of page 2 of the specification ~The second line of the same line, ``2 is a light diffusing plate, which is used to make the light from light source 3 enter uniformly.'' is replaced with ``2 is a light parallel plate, which makes the light from light source 3 parallel. It should not be made into light and incident." 2. In the negative 10th line of specification 4, the statement ``10 is a light diffusing plate'' is corrected to ``10 is a light parallel plate.'' 5. In the seventh line from the bottom of page 5 of the specification, the phrase "2... light diffusing plate" is amended to "2... light parallel plate." 4. In the first line from the bottom of page 5 of the specification, the phrase "10...Light diffuser plate" should be corrected to "10...Light parallel plate." 5. Drawings Figures 1 and 2 are amended and attached as separate sheets. 2-

Claims (1)

[Scope of Claims] 1. A projection television system comprising a transmissive TPT active matrix liquid crystal display element, a backlight light source, a magnifying lens system, a dosing screen, and a television signal processing circuit. 2. It includes a plurality of the liquid crystal color display elements and a magnifying lens system, and is configured so that the displayed images of each display element are slightly shifted and then superimposed on the screen, resulting in an overall high-resolution image quality. Claim 1:
The projection television system described in Section 1.