Display control device

Details Display control device Display control device

1984-12-26

1988-01-19

Curtis, Marshall M.

Communications: electrical

Visual indication

Movable

375107, 340745, G09G 100

Patent

active

047207086

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 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: 4425581 (1984-01-01), Schweppe et al.
patent: 4450442 (1984-05-01), Tanaka
patent: 4455554 (1984-06-01), Demke
patent: 4484187 (1984-11-01), Brown et al.
patent: 4491832 (1985-01-01), Tanaka
patent: 4495594 (1985-01-01), Eggebrecht et al.
patent: 4500991 (1985-02-01), Lubcke
IBM Technical Disclosure, Interlaced Raster Scan Display, vol. 20, No. 4, (Sep. 1977), pp. 1548-1549.

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