Passive matrix addressed LCD pulse modulated drive method with pixel area and/or time integration method to produce covay scale
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United States of America Patent
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Nov 13, 2001
Issued Date -
N/A
app pub date -
Dec 2, 1999
filing date -
Nov 30, 1993
priority date (Note) -
Expired
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Abstract
A method of driving a liquid crystal device, which comprises matrix-addressed driving a liquid crystal device comprising a liquid crystal, particularly a ferroelectric liquid crystal, disposed between a pair of substrates and comprising finely distributed domains differing in threshold voltage for use in switching said liquid crystal, said method being a pulse modulation method comprising modulating at least one of pulse voltage and pulse width, a pixel electrode division method, or a time integration method. Also claimed is a liquid crystal device driven by any of said methods. The liquid crystal device provides a further improved analog multiple gray-scale level display, realizes a large-area display at a low cost, and enables drive at full color video rate.
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