Liquid crystal display having common voltages

Details Liquid crystal display having common voltages Liquid crystal display having common voltages

2006-09-05

2006-09-05

Shalwala, Bipin (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S089000

Reexamination Certificate

active

07102604

ABSTRACT:
A liquid crystal display including a plurality of pixels arranged in a matrix includes a variable common voltage generator. The variable common voltage generator includes a frame memory storing image data for one frame, an average gray calculator calculating the average gray of the image data for one frame, a comparator comparing the calculated average gray from the average gray calculator with a reference gray and generating an adjusting value based on the compared result, and a D/A converter selecting a voltage having an appropriate value among a plurality of voltages generated based on the adjusting value from the comparator and applying the selected voltage as a common voltage.

REFERENCES:
patent: 6118421 (2000-09-01), Kawaguchi et al.
patent: 6166714 (2000-12-01), Kishimoto
patent: 6466191 (2002-10-01), Choi et al.
patent: 6853406 (2005-02-01), Lee et al.

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