Driver circuit for active matrix display

Details Driver circuit for active matrix display Driver circuit for active matrix display

1995-11-14

2000-02-08

Luu, Matthew

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 87, 345 96, G09G 320

Patent

active

060232579

ABSTRACT:
A driver circuit for driving an active matrix liquid crystal display without producing flicker. The inversion frequency of the voltage applied to the liquid crystal panel of the display is examined, the frequency being intrinsic to the display. The difference between voltages applied to opposite sides of the liquid crystal panel is found from the transmissivity of the liquid crystal material, by making use of an image sensor. The found value is converted into digital form by an analog-to-digital converter and stored in a correcting value storage device. When the active matrix display is in use, the difference signal which is found for each pixel and stored in the storage device is added to an image signal applied to the active matrix display, thus preventing flicker intrinsic to the liquid crystal panel.

REFERENCES:
patent: 5041823 (1991-08-01), Johnson et al.
patent: 5206633 (1993-04-01), Zalph
patent: 5625373 (1997-04-01), Johnson

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