Liquid crystal backlight device and method for controlling the same
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United States of America Patent
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Oct 2, 2012
Grant Date -
Mar 15, 2007
app pub date -
Dec 13, 2005
filing date -
Sep 9, 2005
priority date (Note) -
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Abstract
A liquid crystal backlight device and a method for controlling the same are applied to a liquid crystal display apparatus, in which a backlight module is disposed behind a liquid crystal panel to illuminate the panel. The backlight device produces stable illumination to solve the hold type problem due to the hold-type effect of liquid crystal occurred in the prior art. The control method is used to acquire a stable display time from the liquid crystal characteristics and then process the scan signal to match the display data. Controls of the backlight activation signal, including on/off, time delay, and duty cycle adjustment, are then performed to generate a pulse-width modulated signal and a brightness modulated signal so as to produce stable backlight illumination effect. A better display effect can therefore be accomplished.
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