JPH0965263A - Video projector equipment - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To reduce the image quality by displaying a normal moving image and a still image such as characters on the same screen by reducing the effect of the phosphor screen burn-in phenomenon due to the projection of the still image. An object of the present invention is to provide a video projector device that can be prevented. SOLUTION: In a video projector device for inputting a moving image signal and an information signal and projecting and displaying a moving image and a still image on the same screen, a moving image projection unit 1 for projecting a moving image and information projection for projecting a still image. An image projection unit having a section 9; a signal selection section 17 for independently selecting a moving picture signal to be output to the moving picture projection section 1 and an information signal to be output to the information projection section 9; The control unit 18 controls the signal selection unit 17 so that the information projection unit 9 is selected when the moving image projection unit 1 is selected and the information signal is output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video projector device for projecting a normal moving image and a still image such as characters from an information device such as a computer on the same screen.

[0002]

2. Description of the Related Art In general, a CRT projection type projection television for color display has one CRT projection tube which emits R (red), G (green) and B (blue) colors as one unit. The unit or a plurality of units are combined, and the image is enlarged by the projection lens and displayed on the screen.

This CRT projection type projection television is capable of enlarging a small television image with a projection lens and projecting it on a screen to easily obtain a large screen. is there.
In addition to simply providing a moving image on a large screen, character information from an information device such as a computer is often superimposed as a still image on the moving image (superimpose).

FIG. 5 is a block diagram showing the configuration of such a conventional device. A moving image signal for displaying a normal moving image input from the input terminal Ta and an information signal for displaying a still image such as a table or characters input from the input terminal Tb are input to the selection circuit 50, and the control of the control unit 51 is performed. Either is selected by. The selected moving image signal or information signal is input to the video processing unit 52, distributed to the three primary color signals, and output to the respective video amplifiers 53, 54, 55. For example, the video amplifier 53 amplifies the R (red) signal to the CRT projection tube 56, the video amplifier 54 amplifies the G (green) signal to the CRT projection tube 57, and the video amplifier 55 to the BRT.
The (blue) signal is amplified and output to the CRT projection tube 58, respectively. A moving image based on a moving image signal or a still image based on an information signal is projected on the screen. For example, when displaying an image related to a baseball game or a bowling game, a background image is displayed by a moving image signal and a scoreboard table for baseball or bowling is displayed by an information signal.

When the selection circuit 50 is switched to the information signal side, the displayed scoreboard table for baseball, bowling, etc. is displayed at a fixed position on the screen. Also, when the selection circuit 50 is switched to the moving image signal side, the moving image is displayed as a background image.

[0006]

However, in the above-mentioned prior art, when a still image is displayed, the scoreboard table or the like is always displayed at a predetermined position. Therefore, when used for a long time, the fluorescent screen of each CRT projection tube is A so-called burn-in phenomenon of burning occurs, and when the display is switched to the display of a moving image, a still image such as a scoreboard table appears in the moving image due to the burning-in phenomenon, the image quality is significantly deteriorated, and the viewer is uncomfortable.

In order to reduce the burn-in phenomenon, a method of gradually moving the scoreboard table or the like on the screen is adopted, but it sometimes gives viewers a feeling of strangeness.

Therefore, the present invention uses two projection means, one projection means is used for displaying a moving image and the other projection means is used for displaying a still image, and both projection means are used to display one screen. It is an object of the present invention to provide a video projector device capable of displaying images in a superimposed manner and preventing the adverse effect of the burn-in phenomenon caused by a still image on the display of a moving image.

[0009]

A video projector apparatus according to claim 1 of the present invention is a video projector apparatus for inputting a moving image signal and an information signal and projecting and displaying a moving image and a still image on the same screen. A video projecting unit having a first projecting unit for projecting a moving image and a second projecting unit for projecting a still image; a moving image signal output to the first projecting unit and information output to the second projecting unit. Signal selection means for independently selecting signals and signal selection so that the first projection means is selected when outputting a moving image signal and the second projection means is selected when outputting an information signal. And control means for controlling the means.

According to a second aspect of the present invention, in the video projector apparatus according to the first aspect, the first and second projection means are each constituted by a CRT projection unit.

According to a third aspect of the present invention, in the video projector apparatus according to the first aspect, the first projection means is composed of a CRT projection unit for displaying a moving image, and the second projection means is a liquid crystal for displaying a still image. Composed of a projection unit.

According to a fourth aspect of the present invention, in the video projector apparatus according to the third aspect, the liquid crystal projection unit is composed of a monochrome liquid crystal projection unit.

[0013]

In the invention according to claim 1, the image projecting means has the first projecting means and the second projecting means, the moving image is projected from the first projecting means, and the still image is projected from the second projecting means. Project an image. The control section controls the signal selecting means to output the moving image signal to the first projecting means and to independently select and output the information signal to the second projecting means.

According to the second aspect of the present invention, the first and second projection means are each configured by a CRT projection unit to project a moving image and a still image.

According to a third aspect of the invention, the first projection means is composed of a CRT projection unit to project a moving image,
The projection unit of is configured with a liquid crystal projection unit to project a still image.

In the invention according to claim 4, the liquid crystal projection unit is constituted by a monochrome liquid crystal projection unit, and a black and white still image is projected.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing the configuration of a video projector device of the present invention, and FIG.
It is a schematic block diagram which shows the external appearance of the Example of FIG. FIG.
7 shows an example of a display screen on which a moving image and a still image according to the present invention are simultaneously displayed.

The video projector device according to the present invention comprises:
It is composed of a 6-tube type CRT projection unit using two sets of projection units having three CRT projection tubes for R, G, and B, and one projection unit is used for normal moving image projection of moving images and the other is used. The projection unit is used for projecting information such as characters and still images.

In FIG. 1, reference numeral 1 denotes a moving image projection section that projects a moving image as a first projection means. Video projection unit 1
Forms a video processing unit 2 for distributing a moving image signal into three primary color signals (R, G, B), video amplifiers 3, 4, 5 for amplifying each signal of R, G, B and one projection unit. It is composed of CRT projection tubes 6, 7, and 8 for R, G, and B.

Reference numeral 9 is an information projecting section for projecting an information image such as characters as a second projecting means. The information projecting unit 9, like the moving image projecting unit 1, distributes the information signal to the three primary color signals (R, G, B), the video processing units 10, R, G ,.
Video amplifiers 11, 12, 1 for amplifying the B signals respectively
3 and the CRT projection tubes 14, 15 and 16 for R, G and B forming the other projection unit. A video projection means is formed by the information projection section 9 and the moving picture projection section 1.

Reference numeral 17 denotes a signal selection unit, which is configured to include a mute circuit, for example, for a moving image moving image signal input from an input terminal T1 and a still image such as a scoreboard table input from an input terminal T2. Select the information signal. More specifically, the signal selection unit 17 selects a moving image signal or an information signal under the control of the control unit 18, outputs the moving image signal to the line L1 and outputs the information signal to the line L2.

The signal selection unit 17 mutes (suppresses) the output of the video processing unit 10 while the moving image signal is being supplied, and mutes the output of the video processing unit 2 while the information signal is being supplied. I am trying to do it.

FIG. 2 is a schematic diagram showing the appearance of the embodiment shown in FIG. The moving image projection unit 1 and the information projection unit 9 are arranged side by side on the rear surface of the apparatus body 20, and the screen 21 is arranged on the opposite surface. A video amplification / processing unit 22 includes the video processing unit 2 and the video amplifiers 3 to 5 of the moving image projection unit 1 and the video processing unit 10 and the video amplifiers 11 to 13 of the information projection unit 9 described above.

In the above structure, when a moving picture signal is input from the input terminal T1, the control section 18 outputs a control signal to the signal selecting section 17 to output the moving picture signal to the line L1.
The moving image signal input to the moving image projection unit 1 via the line L1 is distributed to the three primary color signals of R, G, B by the video processing unit 2 and amplified by the respective video amplifiers 3, 4, and 5.
The R, G, B moving image signals amplified from the respective video amplifiers 3, 4, 5 are displayed as moving images on the screen 21 (FIG. 2) from the respective CRT projection tubes 6, 7, 8.

On the other hand, when the information signal is input from the input terminal T2, the control section 18 outputs the control signal to the signal selection section 17 and outputs the information signal to the line L2 during that period. The information signal input to the information projection unit 2 via the line L2 is distributed to the three primary color signals of R, G, and B in the video processing unit 10 and amplified by the respective video amplifiers 11, 12, and 13. The R, G, and B information signals amplified from the video amplifiers 11, 12, and 13 are transmitted to the respective CRT projection tubes 14,
From 15 and 16, for example, a scoreboard table or the like is displayed as a still image on the screen 21. Therefore, the moving image and the still image are superimposed on the screen 21, and the viewer can watch the still image such as the score together with the moving image.

FIG. 3 shows an example of a display screen according to the above-mentioned embodiment. The diagonal lines indicate the moving image P projected from the moving image projection unit 1.
a is shown. A still image of the baseball scoreboard table Pb and the count number Pc is projected from the information projection unit 9 and displayed on the moving image Pa in a superimposed manner. The display positions of the scoreboard table Pb and the still images of the count number Pc are displayed at the same position on the screen 21. Therefore, when a still image is displayed at the same position for a long time, the CRT projection tubes 14 to 16 of the information projection unit 9 may have a burn-in phenomenon.

However, in this example, a CR for displaying a moving image signal
Image sticking does not occur in the T projection tubes 6 to 8, and when only a moving image is displayed, the effect of the image sticking of the CRT projection tubes 14 to 16 does not appear in the moving image. Also,
In this example, the CRT projection unit dedicated to the information signal is used to superimpose the still image on the moving image and project it onto the screen 21, so that even if the burn-in phenomenon occurs, only the still image portion becomes slightly dark. There is no effect on the moving image.

FIG. 4 is a schematic configuration diagram showing another embodiment. In the above-described embodiment, the CRT projection units are used for moving images and still images, respectively, so that even if the CRT projection unit of the information projection unit has a burn-in phenomenon, the influence on the moving image projection unit is eliminated. In the example, as the information projection unit, for example, a monochrome (black and white) liquid crystal projection unit that does not cause a burn-in phenomenon is used.

In FIG. 4, reference numeral 40 denotes a main body of the apparatus, which has a screen 41 on the front surface thereof, and an image projecting section 42 as an image projecting unit disposed behind the screen 41. The image projection unit 42 includes three primary colors R, G, which project a normal moving image.
A CRT projection unit 43 having a CRT projection tube for B,
And a monochrome liquid crystal projection unit 44 for projecting a still image such as the front of a scoreboard. Further, the video projecting unit 42 distributes and amplifies the moving image signal into R, G, and B and outputs it to the CRT projection unit 43, and also amplifies and outputs the information signal to the liquid crystal projection unit 44 and outputs it. A section 45 is provided. The video amplification / processing unit 45 is an integration of the video processing units and the amplification units of the embodiment shown in FIG. However, since the monochrome liquid crystal projection unit is used in this example, the information signal is displayed in white or black, but there is no particular problem in the display of a baseball scoreboard or the like. Further, similar to the above-described embodiment, the moving image signal and the information signal are input from the signal selection unit controlled by the control unit from the input terminals T1 and T2 (see FIG. 1).

In the above structure, when a moving image signal is input through the input terminal T1, it is distributed to the R, G, B signals by the video amplification / processing section 45, amplified and output to the CRT projection unit 43, and the screen is displayed. A moving image is displayed on 41.

When an information signal is input to the input terminal T2, it is amplified by the video amplification / processing section 45 during the period and output to the liquid crystal projection unit 44, and the score and the like are superimposed on the moving image as a monochrome still image. Then screen 41
Displayed above.

In this example, since the liquid crystal projection unit is used for projecting information, even if the scoreboard table, the score, etc. are displayed at a predetermined position, the phenomenon of sticking of the fluorescent screen unlike the CRT projection tube does not occur. , A still image without deterioration of image quality can be obtained.

Further, by using a monochrome unit as the liquid crystal projection unit, a color signal processing circuit is not required and the construction and adjustment are facilitated.

Although the liquid crystal projection unit for monochrome is used in this example, it goes without saying that a color liquid crystal projection unit can be used. In this case, video amplification
In the processing unit 45, when an information signal is input, it is divided into R, G, B signals and projected through the R, G, B liquid crystal panel, and the same configuration as the embodiment of FIG. .

[0035]

As described above, according to the video projector apparatus of the present invention as set forth in claim 1, since the moving image and the still image are respectively projected from the dedicated projection units, the projection for the still image is performed. Even if a burn-in phenomenon occurs in the unit, it does not have any influence on the display portion of the moving image, and there is an advantage that deterioration of image quality can be reduced.

According to the second aspect of the present invention, since units having the same structure can be used for the respective projection units for moving images and still images, there is an advantage that maintenance and adjustment work can be facilitated.

According to the third aspect of the present invention, since the liquid crystal projection unit is used as the still image projection unit, the phosphor burn-in phenomenon does not occur as compared with the CRT projection unit, and the image quality is impaired. In addition, there is an advantage that the device can have a long life.

According to the fourth aspect of the present invention, since the monochrome projection unit is used as the still image liquid crystal projection unit, there is an advantage that the configuration is easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a video projector device of the present invention.

FIG. 2 is a schematic configuration diagram showing an appearance of the embodiment of FIG.

FIG. 3 is a diagram showing an example of a display screen of the embodiment of FIG.

FIG. 4 is a schematic configuration diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moving image projection part (1st projection means) 6-8, 14-16 CRT projection tube 9 Information projection part (2nd projection means) 17 Signal selection part (signal selection means) 18 Control part (control means) 44 Liquid crystal Projection unit

Continued Front Page (72) Inventor Fumihiko Sakai 3-3-9 Shimbashi, Minato-ku, Tokyo Toshiba Abu E. Co., Ltd.

Claims (4)

[Claims] 1. A video projector apparatus for inputting a moving image signal and an information signal and projecting and displaying a moving image and a still image on the same screen, wherein a first projection means for projecting the moving image and the still image are displayed. An image projecting means having a second projecting means for projecting; a signal selecting means for independently selecting a moving image signal to be output to the first projecting means and an information signal to be output to the second projecting means; A control means for controlling the signal selecting means so as to select the first projecting means when outputting the moving image signal and to select the second projecting means when outputting the information signal. A video projector device characterized by: 2. The video projector device according to claim 1, wherein the first and second projection means are each constituted by a CRT projection unit. 3. The video projector apparatus according to claim 1, wherein the first projection means is a CRT projection unit, and the second projection means is a liquid crystal projection unit. 4. The video projector device according to claim 3, wherein the liquid crystal projection unit is a monochrome liquid crystal projection unit.