Liquid crystal driving apparatus

Details Liquid crystal driving apparatus Liquid crystal driving apparatus

1994-12-27

1996-12-24

Tung, Kee M.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345147, G09G 510

Patent

active

055877214

ABSTRACT:
In order to enable sharing between a TFT liquid crystal panel and an STN liquid crystal panel as well as provide a colorful gray scale representation, each signal electrode drive circuit for driving a liquid crystal includes a signal conversion means for converting a gray scale display voltage for TFT driving to a gray scale display pulse signal having a pulse width corresponding to the gray scale level. Accordingly, the apparatus for driving a liquid crystal panel such as a TFT liquid crystal panel in which the gray scale control is performed by using the voltage level can be used as the drive apparatus for a liquid crystal panel such as an STN liquid crystal panel in which the gray scale control is performed by pulse width modulation, and a multilevel gray scale representation is achieved because a gray scale display voltage is converted to a gray scale display pulse signal having a pulse width corresponding to the gray scale level.

REFERENCES:
patent: 4427978 (1984-01-01), Williams
patent: 5041823 (1991-08-01), Johnson et al.

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