Character display apparatus

A character display and display device technology, applied in static indicators, cathode ray tube indicators, digital non-picture data transmission and other directions, can solve the problem of character display signal band limitation, limited frequency band, impossible to display characters, etc.

Inactive Publication Date: 2003-04-09
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when this processing is performed, the frequency band used in the processing is limited, and thus the frequency band of character display signals such as small characters is limited, making it impossible to display such small characters

Method used

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  • Character display apparatus
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Examples

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Embodiment Construction

[0015] The present invention will now be described with reference to the accompanying drawings.

[0016] Fig. 2 is a block diagram of an example of a television receiver employing the character display device of the present invention.

[0017] As shown in FIG. 2, a signal received at an antenna 1 is applied to a channel selector 2 so that a desired television signal is received. The received video signal is added to the video processing circuit 3. The signal from the tuner 2 is supplied to the sync separation circuit 4, and the sync signal thus separated is supplied to the video processing circuit 3. The video processing circuit 3 processes the video signal supplied thereto so that images are displayed on multiple display screens such as two display screens not only in multi-screen display but also in double-speed scanning.

[0018] The processed video signal is output from the video signal processing circuit 3 as three primary color signals. The three primary color signals...

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Abstract

According to this character display apparatus, a limit of a frequency band of a character display signal is removed and small characters, etc., also can be displayed satisfactorily. A sync signal from a sync separating circuit (4) is supplied to a character generating circuit (8) in which a display signal of arbitrary characters or the like is formed by RGB three primary color signals in synchronism with predetermined dot clocks. The signal and dot clocks are supplied to the line memory (9). Further, dot clocks are supplied to a multiplying circuit (10) and clock multiplied with an arbitrary multiplying ratio are supplied to the line memory (9) so that the written display signal is read out from the line memory (9). The read out display signal is supplied to a superimposing circuit (5), in which it is superimposed upon the three primary color signals of video signal and supplied to a cathode-ray tube (6), thereby resulting in characters, etc., being displayed.

Description

technical field [0001] The present invention relates to a character display device, more particularly, to a character display device used in a television receiver. Background technique [0002] There is currently commercially available a television receiver capable of displaying desired characters such as text on a picture on a cathode ray tube (CRT) in a superimposed form. This type of television receiver is suitable for adding a character display signal generated by a character generating circuit or the like to the video signal immediately before the CRT. [0003] On the other hand, a television receiver having a 16:9 aspect ratio CRT is also currently on the market. figure 1 An example of such an aspect ratio CRT television receiver is shown. [0004] If such a television receiver displays a video signal with an aspect ratio of 4:3 on the entire display screen, the video signal will inevitably be enlarged and displayed in the horizontal direction. Thus, when displaying...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G5/26H04N5/445H04N7/025H04N7/03H04N7/035H04N9/64
CPCH04N5/44504H04N7/08
Inventor 吉见晃
Owner SONY CORP
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