JPH04354279A - Television receiver - Google Patents

Abstract

PURPOSE:To obtain a television receiver capable of displaying effective video information in the vertical direction of the video image on the full screen of the television receiver while minimizing the deterioration of a video image and display quality occurring at both ends of the screen so as to prevent the effective video information from being lost when a video software of a Vista- vision size is projected, in the television receiver equipped with a display screen having wide aspect ratio. CONSTITUTION:The scanning width in the vertical direction is narrowed so as to prevent the effective video information from being lost, the scanning width in the horizontal direction is kept at a width enough to prevent a warp from appearing at both end parts. By converting a video signal into a digital signal by an A/D converter 4, storing it in a FIFO memory 6, reading it out at a clock faster than a writing clock and restoring it into an analog signal in a D/A converter 8, the time axis in the horizontal direction can be compressed, the horizontal width of the video image can be adjusted and thus, the video image can be displayed on the full width of the screen.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a television receiver having a display screen with a wide aspect ratio such as 16:9, and more specifically, it is suitable for playing Vista Vision size NTSC format video software. related to television receivers.

0002

[Prior Art] In Fig. 3, the aspect ratio of the display surface is 4:3.
This is a diagram showing a state in which, for example, a video software of Vista Vision size is displayed on a television receiver of 1.
is the display screen of the television receiver, 2 is the video area with an aspect ratio of 4:3 including the overscanned part that is not displayed on display screen 1, and 3 is the no-signal area provided to make it Vista Vision size. It is.

Furthermore, FIGS. 4 and 5 are diagrams showing examples in which the above-mentioned Vista Vision size video software is displayed on a television receiver whose display surface 1 has a horizontal aspect ratio of 16:9. This shows a case where overscanning is performed evenly in the horizontal and vertical directions, and FIG. 5 shows a case where the subtitle super area 4 is inserted at the bottom end of the video, so overscanning is performed upward.

The reason why the horizontal scanning width is widened so that the video area 2 is larger than the display surface 1 is as follows.
This is to prevent ringing, bending, etc. that occur at both ends of the image area 2 from appearing on the display surface 1. Along with this, the vertical scanning width also becomes wider, and the upper and lower ends protrude from the display surface 1. ing.

[0005]

[Problem to be Solved by the Invention] When displaying VistaVision size video software images on a conventional wide aspect ratio television receiver, the amount of vertical protrusion as shown in Figures 4 and 5. If there are too many lines, the scanning lines become coarse and the image quality deteriorates, and effective video information in the vertical direction protrudes from the display surface 1 and is lost.

In order to improve these problems, the video area 2 is expanded so that the effective video information in the vertical direction is contained within the display surface 1.
If the size of the image is reduced, image distortion such as ringing or bending at the left and right edges of the screen will appear on the display surface 1, causing problems such as deterioration of image quality.

[0007] This invention was made to solve the above-mentioned problems, and it is possible to use video software with an aspect ratio of 4:3 in which wide aspect ratio video is recorded in a wide aspect ratio television receiver. A screen compression method that can display images to fill the entire display surface, minimizing image degradation at both ends of the screen and deterioration of image quality, while also preventing loss of effective image information in the horizontal and vertical directions. The purpose is to obtain a television receiver equipped with the following.

[0008]

[Means for Solving the Problems] A television receiver according to the present invention narrows the scanning width in the vertical direction and narrows the scanning width in the horizontal direction so that effective video information in the vertical direction is not lost. The time axis compression means compresses the horizontal time axis of the video signal so that the effective horizontal video information just fits within the display surface.

[0009]

[Operation] The means for narrowing the scanning width in the vertical direction according to the present invention narrows the scanning width in the vertical direction in accordance with the aspect ratio of the image information to be displayed so that the effective image in the vertical direction is not lost. In addition, the horizontal time axis compression means compresses the time axis of the video signal so that it fits within the full width of the display screen without narrowing the horizontal scanning width, so the horizontal and All valid video information in the vertical direction can be displayed.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of this embodiment, and is a block circuit diagram of a horizontal time axis compression circuit for a video signal. In the figure, 4 is an A/D converter, 5 is a write clock generation circuit, 6 is a FIFO (first in first out) memory, 7 is a read clock generation circuit, and 8 is a D/A converter.

Next, the operation of this embodiment will be explained. The vertical scanning width is adjusted by a vertical width adjusting means (not shown) so that the effective video information in the vertical direction is displayed over the entire vertical width of the display surface 1.

Next, the scanning width in the horizontal scanning direction is adjusted by a horizontal width adjusting means (not shown) so that ringing, bending, etc. do not appear on both sides of the display surface 1. .

Next, the video signal input to the A/D converter 4 of the time axis compression circuit (shown in FIG. 2(a)) is converted into a digital signal by the clock of frequency f1 generated by the write clock generation circuit 5. and written to the FIFO memory 6. The digital signal stored in the memory 6 for 1H, for example, is read out with a clock of frequency f2 (f1<f2) generated by the read clock generation circuit 8,
It is returned to an analog signal by the D/A converter 7, and the signal is converted to an analog signal in FIG.
) is a video signal whose time axis is compressed. The amount of time axis compression can be determined by selecting an appropriate ratio of clock frequencies f1 and f2, so that effective video information in the horizontal direction can be displayed across the entire width of display surface 1, and the scanning width in the horizontal direction remains unchanged. , ringing, bending, etc. do not appear at both ends of the display surface 1.

[0014]

As described above, according to the present invention, in a wide aspect ratio television receiver, the vertical scanning width is narrowed so that effective vertical images are not lost, and the horizontal scanning width is By compressing the time axis of the video signal without narrowing the scanning width so that the video width fills the entire width of the display screen, it is possible to maintain the VistaVision size without image distortion or deterioration occurring at the left and right edges of the screen. Images such as video software can be displayed on the entire screen of a television receiver having a wide aspect ratio display surface.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of an embodiment of the present invention.

FIG. 2 is a waveform diagram of a video signal before and after time-base compression according to the present embodiment.

FIG. 3 is a diagram showing one form of screen display on which VistaVision size video software is displayed on a television receiver with an aspect ratio of 4:3.

FIG. 4 is a diagram showing one form of screen display on which VistaVision size video software is displayed on a television receiver with an aspect ratio of 16:9.

FIG. 5 is a diagram showing another form of screen display in which VistaVision size video software is displayed on a television receiver with an aspect ratio of 16:9.

[Explanation of symbols]

4 A/D converter 5 Write clock generation circuit 6 FIFO memory 7 Read clock generation circuit 8 D/A converter

Claims (1)

[Claims] 1. In a television receiver having a display screen with a wide aspect ratio, means for displaying valid information in the vertical direction of an image to fill the vertical width of the display screen by changing the scanning width in the vertical direction; The present invention is characterized by comprising a time axis compression means for compressing the time axis of the video signal while maintaining the horizontal scanning width of the signal to a predetermined width, and displaying valid video information in the horizontal direction to fill the width of the display surface. television receiver.