Character display control circuit

Details Character display control circuit Character display control circuit

1998-09-04

2000-05-16

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Character generating

345468, G06T 1700

Patent

active

060644028

ABSTRACT:
Data about display start positions are stored in an H register. An H start counter counts an original oscillation signal ORGCLK after the termination of a flyback period, and a comparator detects a start position. Flip flops and NOR gates form a clock having a cycle one and a half times as long as that of the original oscillation signal from the start position, and either the signal having a 1.5-fold cycle or the original oscillation signal is selected according to the level of a mode signal MODE. Thus, it is possible to obtain a clock OSDCLK having a frequency the same as that of the original oscillation signal up to the start position and a clock OSDCLK having a frequency corresponding to magnification from a display position. Therefore, by controlling display of characters based on the clock OSDCLK, display start positions can be made even regardless of magnification.

REFERENCES:
patent: 5768490 (1998-06-01), Hersch et al.
patent: 5831636 (1998-11-01), Merchant et al.
patent: 5870085 (1999-02-01), Laksono
patent: 5936636 (1999-08-01), Gelfenbain
patent: 5940084 (1999-08-01), Motokado et al.
patent: 5940085 (1999-08-01), Chandavarker et al.

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