Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1996-09-27
1998-11-17
Saras, Steven J.
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
345 11, 345 12, 348173, G09G 500, H04N 320
Patent
active
058383123
ABSTRACT:
The synchronization signal processing circuit of a monitor for protecting the cathode ray tube includes a rectifying unit for rectifying a synchronization signal supplied from the outside; a first inverting unit for inverting the rectified signal and generating a first inverted signal; a control unit for controlling the output of the first inverted signal according to the synchronization signal by being switched on; a second inverting unit for delaying the rectified signal for a predetermined time period, inverting the delayed rectified signal, and generating a second inverted signal; and a synchronization signal outputting unit for buffering the first and second inverted signals and applying the buffer signal to a microprocessor, a video signal processor and a deflection circuit respectively. Accordingly, even while there is no input from the keyboard for a certain time period, the fluorescent screen of the CRT can be protected since the point of the screen to which the video signal is injected changes.
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Daewoo Electronics Co. Ltd.
Saras Steven J.
Vail Seth D.
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