Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-09-20
1999-08-17
Wu, Xiao
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345213, G09G 336
Patent
active
059400617
ABSTRACT:
A clock sent from a clock generator is subjected to frequency division by a plurality of frequency dividers responsible for different fractions of an input frequency. A switch selects and outputs any of the outputs of the plurality of frequency dividers, and thus varies the frequency of the clock within one horizontal scanning period. The clock is used to sample a video signal, whereby an image to be displayed on a liquid-crystal panel can be compressed or stretched according to a position in the horizontal direction of a screen. Thus, it can be prevented to give a sense of incompatibility even when a video signal indicating an aspect ratio different from the aspect ratio of the screen is displayed.
REFERENCES:
patent: 5406308 (1995-04-01), Shiki
patent: 5534940 (1996-07-01), Sato et al.
Tozaki Shozo, "Liquid Crystal Panel Drive and Control Circuit", Patent Abstracts of Japan, vol. 17, No. 287, Jan. 22, 1993.
Ko Hidemasa, et al. "Liquid Crystal Display Device", Patent Abstracts of Japan, vol. 17, No. 161, Nov. 13, 1992.
Kabushiki Kaisha Toshiba
Wu Xiao
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