JP2656487B2 - TV receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver suitable for displaying images of television systems having different aspect ratios.

[Conventional technology]

Conventionally, a method converter between a current television and a high-definition television having different aspect ratios is described in Proceedings of the 1986 National Convention of the Institute of Television Engineers, pp. 307,308. High definition television has an aspect ratio of 5: 3 (or 16:
9). To display this image on the current television receiver (aspect ratio 4: 3), either cut the left and right edges, provide a black background at the top and bottom, or display the entire image, or reduce it horizontally. There is a method of displaying the entire screen as a long image.

In order to display an image of the current television on a high-definition television receiver, there is a method of displaying the image with the left and right ends blackened vertically and displaying the image as a horizontally wide image by expanding the left and right sides.

[Problems to be solved by the invention]

The above-described prior art has a problem that a part of the image is missing, the image size is reduced when displaying the entire screen, or the image becomes horizontally long or vertically long.

SUMMARY OF THE INVENTION An object of the present invention is to provide a television receiver which can change a position where an image is missing according to the content of the image in accordance with the preference of a viewer.

[Means for solving the problem]

An object of the present invention is to provide a display device for displaying an image conforming to a first television system, and a signal for a second television system having an aspect ratio different from that of the first television system on the display device. This is achieved by changing the image position of the second television system in accordance with an instruction from the display position designating device, comprising a signal conversion device for creating a signal, a display position designating device and its image receiving device.

[Action]

The signal conversion device knows the image position to be cut of the signal of the second television system according to the instruction from the display position designation means, deletes the portion, and converts it to the signal of the first television system.

Preferably, the display position means is configured to be operated by a remote device.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. In the figure, a signal of a second television system input from an input terminal 1 is supplied by a signal conversion circuit 2 to a display device 3 conforming to the first television system having a different aspect ratio.

FIG. 2 shows the state of the input image and the display image. FIG. 3A shows a case where an image of the second television system having an aspect ratio of 5: 3 is displayed on a receiver of the first television system having an aspect ratio of 4: 3. The entire image of the input television signal is displayed in the vertical direction of the display device 3, and a part of the image is cut in the horizontal direction. The viewer can move the left end position A of the display screen to the left and right as indicated by an arrow, for example, by using display position designation means such as the remote controller 4. The signal from the remote controller 4 is received by the receiving circuit 5, and in the case of a cut position change instruction, a control signal 6 is generated to change the display image start position a of the signal converter 2.

FIG. 2B shows an image when a current television signal having an aspect ratio of 4: 3 is displayed on a high-definition television receiver having an aspect ratio of 5: 3. In this case, when the input image is displayed in the horizontal direction so as to fill the image frame of the display device 3, an image portion cut in the vertical direction occurs. The remote control device 4 instructs the vertical movement of the display start position a.

FIG. 3 shows an example of the configuration of the signal conversion device 2,
The television signal of the second system is written into the frame memory 7,
The data is read out at the timing of the first method, supplemented by the interpolation circuit 8, and converted into a television signal of the first method. The read timing of the frame memory is controlled by the control signal 6 from the receiving circuit 5.
And the movement of the display start position can be realized. In the figure, the position of the interpolation circuit 8 can be set before the frame memory 7. The control of the frame memory 7 by the control signal 6 can be realized by a method of controlling the write timing in addition to controlling the read timing.

FIG. 4 shows an example of a specific signal waveform when a 5: 3 television signal is displayed on a 4: 3 display device. (A) is an input television signal, (b) and (c) are horizontal. A signal conversion device that deletes 1/5 of the right ((b)) or left ((c)) of the directional image portion and time-expands the remaining image signal to 5/4 times for display on a display device This output signal is 2. The image portion to be deleted only needs to be 1/5 of the total of the left and right sides, and can be arbitrarily specified by the display position specifying means.

FIG. 5 shows an example of a waveform diagram of an embodiment in which a horizontal drive signal (or a vertical drive signal) of a display device is signal-converted without changing a video signal. FIG. 3A shows an input television signal having an aspect ratio of 5: 3, and an image in an arbitrary horizontal direction of 4/5 is displayed on a display device having an aspect ratio of 4: 3. FIG.
Is an example of a horizontal drive signal waveform of the display device. By changing the part of the arrow by the control signal from the display position designating means, the right end and the left end are combined so that the 1/5 part is not displayed.

〔The invention's effect〕

According to the present invention, the cut position of a television image having a different aspect can be changed according to the preference of a viewer, so that a television image of a different system can be received without losing a part of an important image, and It is possible to enjoy various television programs.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of an image display area in the embodiment of the present invention, and FIG. 3 is a block diagram of a main part of the embodiment of the present invention shown in FIG. 4 and 5 are waveform diagrams for explaining the operation of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Input terminal, 2 ... Signal conversion device, 3 ... Display device, 4 ... Remote control device, 5 ... Receiving circuit, 7 ... Frame memory, 8 ... Interpolation circuit.

Claims (1)

(57) [Claims] 1. A television having an input terminal to which an image signal of a second television system is inputted, and a display device conforming to the first television system having an aspect ratio different from that of the second television system. In the television receiver, means for designating a display area in which a part of the image of the second television system is deleted, and designating the display area in an image signal input from the input terminal A signal conversion device for generating a signal for displaying an image signal in a display area designated by the means on the display surface of the display device.