Computer graphics processing and selective visual display system – Data responsive crt display control – Data responsive deflection control
Patent
1994-09-20
1997-03-11
Hjerpe, Richard
Computer graphics processing and selective visual display system
Data responsive crt display control
Data responsive deflection control
345213, G09G 108
Patent
active
056106220
ABSTRACT:
A CRT (cathode ray tube) controller for controlling one CRT device in an interlace mode has a synchronizing circuit of bi-directional construction, in order to make possible synchronous operation of the CRT controller with other circuits (other CRT controllers or a TV system). When the CRTC is used as a master circuit of a CRT display system, a synchronizing signal is derived from the synchronizing circuit in synchronization on with a count signal of a vertical scanning counter and an output of an interlace controller of the CRTC, and is supplied to a synchronizing terminal of the other CRTCs. Scanning counters and a flip-flop for controlling an interlace operation of the other CRTCs are reset to their initial state in synchronization with the synchronizing signal. When the CRTC is used as a slave circuit, scanning counters and a flip-flop of the CRTC are reset to their initial state in synchronization with the external synchronizing signal.
REFERENCES:
patent: 3898377 (1975-08-01), Fairbairn et al.
patent: 4200869 (1980-04-01), Murayama et al.
patent: 4309700 (1982-01-01), Kraemer
patent: 4379293 (1983-04-01), Boisvert et al.
patent: 4434420 (1984-02-01), Bujalski
patent: 4437093 (1984-03-01), Bradley
patent: 4450442 (1984-05-01), Tanaka et al.
patent: 4484187 (1984-11-01), Brown et al.
patent: 4491832 (1985-01-01), Tanaka
patent: 4495594 (1985-01-01), Eggebrecht et al.
patent: 4720708 (1988-01-01), Takeda et al.
patent: 4899139 (1990-02-01), Ishimochi et al.
patent: 4904990 (1990-02-01), Takeda et al.
Katsura Koyo
Takeda Hiroshi
Yoshida Shigeaki
Hitachi , Ltd.
Hjerpe Richard
Nguyen Chanh
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