Display control device for controlling first and second displays

Details Display control device for controlling first and second displays Display control device for controlling first and second displays

1994-04-13

1996-11-26

Hjerpe, Richard

Computer graphics processing and selective visual display system

Plural display systems

Diverse systems

345213, G09G 500

Patent

active

055790259

ABSTRACT:
A display control device performs, in accordance with an application program prepared for a first display, a display control for a second display which has a different display timing from the first display. The device includes a clock generation circuit for generating a basic clock for driving the second display, a first controller and a second controller. The first controller includes a first timing control register capable of rewriting in accordance with the application program. The second controller includes a second timing control register for setting a display timing of the second display and generating a synchronizing signal for the second display on the basis of contents of the second timing control register and the basic clock. The first controller is operated by the basic clock and generates a timing signal for the second display on the basis of the synchronizing signal for the second display and the contents of the first timing control register. Even in a case where contents of the first timing control register have been rewritten by the application program, the first controller generates various timing signals based on the basic clock and the synchronizing signal for the second display and, therefore, it does not affect the display operation of the second display.

REFERENCES:
patent: 4760387 (1988-07-01), Ishii et al.
patent: 4926166 (1990-05-01), Fujisawa et al.
patent: 5111190 (1992-05-01), Zenda
patent: 5138305 (1992-08-01), Tomiyasu
patent: 5218274 (1993-06-01), Zenda
Seiko Epson Corp., '89 CMOS LSI Data Book, 1989, pp. D-62 through D-67 and an unnumbered page.

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