JPH01194576A - Video display device - Google Patents

Abstract

PURPOSE:To enable a picture having high definition to be observed by attenuating the signal of the end part of a displayed picture toward the end part of the picture when the picture is displayed on a display device whose aspect ratio is different from that of the video picture to be displayed. CONSTITUTION:When the picture whose aspect ratio is different from that possessed by the display screen of the display device is displayed on that display screen of the device such as a case that an usual television picture is displayed on the display screen of a device suitable for receiving an HDTV picture, the signal of the end part of the display picture is attenuated toward the end part of the picture. Thus, even if the display device is used for the plural kinds of picture displays whose aspect ratio is different, the video display device which the difference of the luminance at the end part of the picture is inconspicuous can be obtained.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for displaying an image on a display device having a different aspect ratio from the video image to be displayed, in particular when displaying an image on a display surface of a device suitable for HDTV image reception. The present invention relates to a video display device suitable for displaying television images.

[Prior art] A normal television receiver has a screen with a different aspect ratio (horizontal:
The size ratio (vertical) is 4:3, and the fluorescent surface also has a size ratio of approximately this. In contrast, in the high-definition television system called HDT or high-definition, this ratio is reduced to 5.
=3 or 16:9 has been proposed. Naturally, a television receiver with a horizontally long display screen like this is required, but in this case, the images to be received are not only HDTV images, but also conventional television images (with an aspect ratio of 4). :3) will also need to be displayed. For example, if an image with a width to height ratio of 4:3 is displayed on the fluorescent surface of a receiver with a width to height ratio of 16=9, the image will appear at both ends or one side of the screen, as shown in Figures 3 to 5. This results in blank spaces that are not displayed. If used for a long period of time under such conditions, the luminance will deteriorate due to deterioration of the phosphor in the image display part or the browning phenomenon of the panel glass, and after that, the phosphor surface gold surface will be replaced to display the HDTV screen. When used, uneven brightness will occur. especially,
This brightness unevenness is very noticeable because there is a step on the border between the edge and margin of the 4:3 screen.
When displaying TV images, the image quality will be significantly degraded.

[Problems to be Solved by the Invention] The present invention solves the above conventional problems and provides a video display in which differences in brightness at the edges of images are not noticeable even when used to display multiple types of images with different aspect ratios. The purpose is to provide equipment.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, when an image having an aspect ratio different from that of the display surface of the device is displayed on the display surface of the device, one display image The signal at the end is attenuated toward the end.

[Function] When using a normal display device, not just a cathode ray tube, it is possible to avoid deterioration of display brightness or change of display color after long periods of use due to deterioration of components related to displaying a single image. It's difficult. As described above, in the present invention, the signal and brightness at the edge of the display image are attenuated toward the edge, that is, faded out, so that the display brightness decreases due to deterioration of the components at the edge of the image, in other words, a burn-in phenomenon. This has minimized the effects of burn-in phenomena such as reductions in display brightness and changes in display colors in specific areas of the screen that correspond to the edges of previously displayed images, making them virtually inconspicuous. . FIG. 1 shows an example of a signal with both ends faded out according to the present invention, and FIG. 2 shows an example of a normal video signal.

The wider the fade-out area, the less noticeable the border line will be, but the effective screen area will be reduced, so a compromise must be made at an appropriate point.

In addition, instead of just fading out, if you display no signal gray in the margin area, it will be more effective to reduce uneven brightness in the low range, and it is also possible to display channels, information, small screen displays, etc. in this margin area. Of course, it is also possible.

Furthermore, if the entire rask is moved left and right at a slow speed that is invisible to the naked eye at the same time as fading out, it is effective to reduce brightness unevenness by superimposing the fade-out effect.

[Example] A specific method for attenuating the signals at both ends of the rask is to pass the received rask signal through a special attenuator that causes particularly large attenuation at both the left and right ends, but does not cause attenuation at the center of the screen. good. this.

In order to directly produce an image display signal, the deflection circuit must be of a multi-scan type (multi-frequency deflection type).

In addition, when storing the output of the above special attenuator in memory, the deflection system remains one type (for example, HDT
(for V) can be displayed by rearranging only the video signals. As the memory in this case, it is possible to use the frame memory normally built into an EDTV or HDTV as is.

In the above embodiment, in the television receiver, one of the receivers is
Although we have explained the case where a 4:3 image is displayed on a 6:9 display screen, any other aspect ratio may be used, and the application is not limited to TV viewing, but can be used for displays in general, Of course, it can be applied to various purposes such as industrial use and monitoring use.

[Effects of the Invention] As explained above, according to the present invention, after a device displays an image having a different aspect ratio from that of the display surface of the device for a long period of time, an image having the same aspect ratio as the display surface of the device is displayed. When displaying an image that you have, differences in brightness and color will no longer occur or be noticeable at the boundaries of the previous image display area.
It becomes possible to observe images of good quality.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a signal with both ends faded out according to the present invention, Fig. 2 is a diagram showing an example of a normal video signal, and Figs. 3 to 5 are illustrations of blank areas. Figure 5

Claims (1)

[Claims] 1. When an image having an aspect ratio different from that of the display surface of the device is displayed on the display surface of the device, the signal at the edge of the displayed image is attenuated toward the edge. video display equipment.