JPS63182979A - LCD TV projector system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a display device that projects an image from a video signal, particularly a portable liquid crystal television projector using a liquid crystal television.
It's about systems.

<Prior Art> Conventionally, as video display devices such as televisions, the following types are known: (1) pocket liquid crystal television, (2) CRT television, (3) rear projection television, and (4) projection television. .

<Problems to be solved by the invention> By the way, the first pocket LCD TV was small with a screen size of about 15 to 4 inches, and had excellent mobility and could be viewed anywhere. However, the screen was small. Due to the narrow field of view, it was not possible for a large number of people to view it.

Secondly, as the screen size of the second CRT TV increases, the weight increases exponentially, and a 40-inch CRT TV weighs about 1,000 cm, making it difficult to move and requiring a very large device. Therefore, it required a large space to install.

In addition, although the weight of the third type of rear projection TV is slightly reduced, it has a built-in red, green, and blue CRT, so
The weight is about half that of RT TV, so it is difficult to reduce the weight significantly.

Finally, the fourth type of projection TV is difficult to set up and uses a three-tube projection lens for red, green, and blue, which causes color shift, which is especially noticeable on small screens, and the screen is also dedicated. screen is required.

Of the above types of devices, the screen size cannot be changed with the exception of projection TVs, and even if the screen size of projection TVs can be changed, adjustments must be made each time, and each device has its own advantages and disadvantages. Therefore, they were supposed to select and use equipment that suited their purpose.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide a video display system using a liquid crystal television that can be easily used for various purposes.

<Means for Solving the Problems> The configuration of the present invention for achieving the above-mentioned object will be explained using FIG. 1 corresponding to an embodiment.

The present invention relates to a liquid crystal television 1, a projector device 2 to which the liquid crystal television 1 is detachably attached in order to project an image on the liquid crystal television 1, and a rear projection screen 9 provided on the top of the projector device 2. This is a projector system consisting of a total reflection mirror 8 that is movable up and down and provided at the front of the projector device 2 for projection.

Function> First, when the liquid crystal television 1 is used alone, it becomes a portable liquid crystal television.

Next, when the LCD TV 1 is attached to the projector device 2, when the total reflection mirror 8 is lowered to the solid line position shown in the figure, that is, within the optical path of the projector device 2, the image surface of the LCD TV 1 is changed to the total reflection mirror. When the total reflection mirror 8 is moved up to the position indicated by the two-dot chain line shown in the figure, that is, outside the optical path of the projector device 2, the image plane of the LCD television 1 is projected onto the external screen 10. The image is enlarged and projected.

By combining the liquid crystal television 1 and the projector device 2 as described above, it can be easily used as a portable liquid crystal television, a rear projection television, or a projection television, depending on the purpose of use.

<Example> An embodiment of the present invention will be described based on FIG.

1 is a transmissive liquid crystal television, and 2 is a projector device. This projector device 2 is composed of a light source 3, a reflection plate 4, a condenser lens 5, a transmission type LCD TV mounting part 6, and a projection lens 7, and a total reflection mirror 8 is pivotally supported in the front part thereof so as to be movable up and down. The lowering position located in the optical path (
(indicated by a solid line), an elevated position located outside the optical path (indicated by a two-dot chain line), and (C). A screen 9 is provided.1
0 is a projection screen.

In this embodiment with the above configuration, when the transmissive liquid crystal television 1 is removed from the projector device 2, the transmissive liquid crystal television 1 can be used alone as a portable liquid crystal television.

Next, when the transmissive liquid crystal television 1 is attached to the television mounting part 6 of the projector device 2, the light generated from the light source 3 is incident on the transmissive liquid crystal television 1 via the reflection plate 4 and the condenser lens 5, and is transmitted. The light passing through the liquid crystal television 1 is modulated as brightness and darkness by changing the transmittance of the image on the liquid crystal television.

At this time, if a color liquid crystal television is used as the liquid crystal television 1, color images are modulated.

In the state shown by the solid line in which the total reflection mirror 8 is located in the optical path, the obtained modulated light is imaged from the rear side by the projection lens 7 via the total reflection mirror 8 on the rear projection type NuClean 9, and from the front side. You can see the video.

In the case of this rear projection type, an arbitrary projection magnification can be set depending on the focusing distance of the projection lens 7 and the positional relationship between the total reflection mirror 8 and the screen 9.

Furthermore, in the state shown by the two-dot chain line in which the total reflection mirror 8 has moved and is located outside the optical path, an image of the obtained modulated light is directly projected onto the screen 10 by the projection lens 7. In this projection type, the projection magnification is determined by the focal length of the projection lens 7 and the distance to the screen 10, and by arbitrarily selecting the distance to the screen 10, the size of the image can be freely set.

Note that the screen 10 does not need to be a dedicated screen, and may be a white wall, a shoji screen, etc., and it goes without saying that images can be projected anywhere.

<Effects of the Invention> As explained above, the present invention can appropriately configure not only a portable LCD television, but also a rear projection television and a projection television by combining an LCD television and a projector device. This has the effect of making it possible to provide images from a small screen to a large screen of 50 inches or more with a very small and lightweight device.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of an embodiment of a liquid crystal television projector system according to the present invention. DESCRIPTION OF SYMBOLS 1...Transmissive liquid crystal television, 2...Projector device, 3...Light source, 4...Reflector, 5...Condenser lens, 6...Liquid crystal TV mounting part, 7...Projection Lens, 8... Total reflection mirror, 9... Rear projection type screen, 10... Projection type screen ---La night: 1st child Levi's eyes 7--general 1 many years old 8- total reflection mirror 9-11 rear projection type and free

Claims (1)

[Claims] 1. A liquid crystal television, a projector device to which the liquid crystal television is detachable for projecting the image surface of the liquid crystal television, and a projector device attached to the front of the projector device for projecting onto a rear projection screen provided at the top of the projector device. What is claimed is: 1. A liquid crystal television projector system comprising a total reflection mirror that can be raised and lowered, and can be configured into a portable liquid crystal television, a rear projection type device, and a projection type device.