Half tone display driving circuit for crystal matrix panel and half tone display method thereof
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United States of America Patent
Stats
-
Aug 6, 1991
Grant Date -
N/A
app pub date -
Aug 18, 1989
filing date -
Aug 29, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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