State indication circuit for a display system

Details State indication circuit for a display system State indication circuit for a display system

1996-03-20

1998-05-26

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345 13, 345211, 345212, 348500, 348536, G04G 500

Patent

active

057573662

ABSTRACT:
A horizontal synchronizing signal Hs and a vertical synchronizing signal Vs are converted to digital data, respectively, by corresponding frequency-to-voltage conversion circuits 10 and 20 and AD conversion circuits 30 and 40. These digital data are compared with regulation values corresponding to the operation frequencies of a CRT display 2000 stored in the regulation value memory 90 by a frequency decision circuit 50 so that abnormality of frequency of the horizontal synchronizing signal and vertical synchronizing signal is decided. At an abnormal time, the state indication data corresponding to the abnormal state are read out from the state indication data memory 70. The display control circuit 60 constitutes a new video signal based on the state indication data and supplies the new signal to the CRT display in place of the video signal from the computer 1000 through the switch 80.

REFERENCES:
patent: 5029284 (1991-07-01), Utsumi et al.
patent: 5031118 (1991-07-01), Morizot
patent: 5298920 (1994-03-01), Shindo
patent: 5394171 (1995-02-01), Rabii
patent: 5635960 (1997-06-01), Onagawa

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