JPH0358082A - Multi-crt projection type projector - Google Patents

Abstract

PURPOSE:To constitute one picture on a screen and to obtain a large picture by projecting pictures of plural CRTs arranged in matrix on the screen through optical lenses. CONSTITUTION:The matrix-arranged CRTs 1 of a multi-CRT projection type TV are equipped with time-base extension processing parts 2. Each processing part 2. Each processing part 2 divides the video signal of an image into video signals of parts of the image with a horizontal/vertical synchronizing signal and a clock signal and inputs them to the CRTs 1. Then an optical system 4 projects the respective pictures on the screen. Consequently, one picture is constituted on the screen to obtain the large picture. Further, video signals of overlaps of adjacent peripheries are inputted to adjacent CRTs 1 and put one over the other partially to make joins of images inconspicuous.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel multi-CRT projection type projector that projects images of a plurality of CI{Tiii'M onto a screen.

[Background of the Invention] In recent years, a multi-CRT display system has been proposed in which a plurality of CRTs are arranged in a matrix and different images or a single image are displayed on the plurality of CRTs. on the other hand,
A CRT, a screen that reflects the image on the CRT screen,
A projection type projector has been proposed that includes an optical system for projecting the image onto a screen.

[Problems to be Solved by the Invention] However, although the multi-CRT display system described above is suitable for large screens, since a plurality of CRTs are arranged, the CRT screens cannot be displayed continuously; There was a problem that the images were difficult to see.

On the other hand, in a projection type projector, there is a limit to the brightness of C}IT, and it is impossible to obtain an image identical to that of a CRT screen. In addition, there are problems specific to assigning one CI{T to each of R, G, and B of an image, such as deterioration of image quality due to the coating of the lens of the optical system provided in each CRT, the tilt angle, etc.

This invention solves the above problems by combining the above multi-CRT display system and a projection type projector.
Focusing on the fact that it is possible to realize a large screen, multiple CR
A new multi-CR that displays the images on the T screen as if they form one screen on the screen, making it possible to enlarge the screen and obtain an easy-to-see image.
The purpose of the present invention is to provide a T projection type projector.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a plurality of CRTs arranged in a matrix, a screen for displaying images of the plurality of CRT screens, and a screen for displaying the images on the screen. The plurality of CRTs are equipped with an optical lens for taking pictures;
The gist is that the screen image is displayed on the above screen.

Further, in the present invention, when configuring the images of the plurality of CRT screens as one screen on the screen, partially overlapping images are displayed on adjacent CRT screens among the plurality of CRTs. It is.

[Function] With the above configuration, images of CRT screens arranged in a matrix are projected onto the screen. At this time, the joints of the images projected onto the screen are made inconspicuous by the optical system. Therefore, it is possible to obtain an image on a large screen, and also to obtain an image that is easy to view.

Furthermore, when displaying one image on the entire screen, the image is divided and displayed on multiple CRT screens, but each adjacent CRT screen displays a partially overlapping image, and When the image on the CRT screen is projected onto the screen, a portion of the image is overlappingly projected by the optical system, so that a single image with inconspicuous seams is projected onto the screen.

[Implementation example] Embodiments of the present invention will be described below with reference to FIG.

In Figures 1 and 2, a multi-CRT projection television includes multiple CRTs (for example, regular color cathode ray tubes) arranged in a matrix (for example, 3 x 3).
is provided. Further, in a multi-CRT projection television, each of the CRTs 1 is equipped with a time axis expansion processing (signal division) section 2 that divides the video signal. When the video signal of the image shown in Figure 3 is input, the multiple CRTs 1 receive the video signal of a part of the image (a, b, ..., i screen) by the horizontal/vertical synchronization signal and clock signal. The video signals of screens a, b, . . .

Furthermore, multi-CRT projection televisions. An optical system (lens) 4 for projecting images of the a l b I..., i screens of a plurality of CRTs 1 onto a predetermined area of a screen 3 (shown in FIG. 6) is provided for each CRTI.

Here, for example, as shown in FIGS. 4 and 5,
When an image is projected onto the screen 3, the image displayed on each CRT screen 1a will be explained.

First, the video signal of the image projected onto the screen 3 is divided by the time axis expansion processing section 2. As shown by the diagonal lines in FIG. A video signal with overlapping parts is input. That is, for example, for CRT1 of screen a, adjacent CRT1
A video signal that partially overlaps the b-screen and d-screen is input. In addition, the other CRT 1 has the CR of the above a screen.
Similar to T1, a video signal that partially overlaps the screen 1a of the adjacent CRT 1 is input. Then, as shown by the broken line in FIG. 5, adjacent and partially overlapping images are displayed on each CRT screen 1a by these video signals, but as shown in FIG. The images are partially overlapped by the optical system 4, and this overlapped image is projected onto the screen 3.
The joints between the images on each CRT screen 1a are not noticeable.In addition, in each of the CRT screens 1 mentioned above, when the images are partially overlapped and projected onto the screen 3, the brightness of the overlapped part becomes high, so it corresponds to the above overlapped part. The brightness of this area is lower than that of the central area. That is, for example, the seventh
As shown in the figure, explaining the CRT screen 1a of screen b, the brightness at both ends of the CRT screen 1a is lower than that at the center. Therefore, as shown in FIG. 8, for example, the gains of the signals corresponding to both end portions are made smaller than those of the central portion. In addition, although FIG. 7 and FIG. 8 are related to the horizontal direction of the CRT @ surface 1a,
Similar processing is performed in the vertical direction. This results in
The brightness distribution on the screen 3 is made uniform, making it possible to make the projected image easier to see. In this way, multiple CRTs
1 are arranged in a matrix, and the images of the CRT screens 1a are projected onto a predetermined area of the screen 3 by an optical system, and the images of the adjacent CRTs 1 are partially overlapped and projected onto the screen 3. Therefore, the seams between images on the screen 3 are not noticeable, and a large, easy-to-read image can be obtained. [Effects of the Invention] As explained above, according to the multi-CRT projection type projector of the present invention, a plurality of CRTs are arranged in a matrix, and the CRT screens partially display images of adjacent CRTs. Since the overlapping images are displayed and the overlapping parts of these images are projected on the screen in an overlapping manner by an optical system, the joints of the images on the screen are not noticeable, and an easy-to-see image can be obtained on the large screen.

[Brief explanation of drawings]

FIG. 1 is a CI {T arrangement diagram of a multi-CRT projection projector showing an embodiment of the present invention, and FIG.
A schematic partial block diagram of the RT projection type projector, FIGS. 3 to 5 are diagrams for explaining images in the multi-CRT projection type projector, and FIG. 6 is a schematic partial block diagram of the multi-CRT projection type projector. The image diagrams, FIGS. 7 and 8 are diagrams for explaining the brightness correction of each CRT screen in the multi-CRT projection type projector. In the figure, 1 is a CRT, la is a CRT screen, 2 is a time axis expansion processing (signal division) section, 3 is a screen, and 4 is an optical system (lens).

Claims (2)

[Claims] (1) comprising a plurality of CRTs arranged in a matrix, a screen for displaying images of the plurality of CRT screens, and an optical lens for projecting the images onto the screen; A multi-CRT projection type projector characterized by displaying images on a screen. (2) When configuring the images of the plurality of CRT screens as one screen on the screen,
The multi-CRT according to claim 1, wherein partially overlapping images are displayed on adjacent CRT screens.
projection type projector.