Half tone display driving circuit for crystal matrix panel and h

Details Half tone display driving circuit for crystal matrix panel and h Half tone display driving circuit for crystal matrix panel and h

1989-08-18

1991-08-06

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340793, 340805, 340767, 358236, G09G 336, G09G 300

Patent

active

050381393

ABSTRACT:
In a half tone display driving circuit for a liquid crystal matrix panel, a pulse for half tone display is phase modulated so that pulse signals which are out of phase relative to each other are applied to adjacent columns of the liquid crystal matrix panel, or from the phase-modulated pulse a gray scale pulse (tone pulse) is prepared in which the frequency of occurrence of voltage edges is decreased. The dephased pulse signals or the gray scale pulse (tone pulse) is used to prevent a decrease in brightness of display when the liquid crystal matrix panel is driven for half tone display.

REFERENCES:
patent: 4511926 (1985-04-01), Crossland et al.
patent: 4743096 (1988-05-01), Wakai et al.
patent: 4748510 (1988-05-01), Umezawa
patent: 4775891 (1988-10-01), Aoki
patent: 4779083 (1988-10-01), Ishii et al.
patent: 4795239 (1989-01-01), Yamashita et al.
patent: 4857906 (1988-08-01), Conner
patent: 4859998 (1989-08-01), Kawamura et al.

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