Driving a liquid crystal display
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United States of America Patent
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Apr 6, 2004
Issued Date -
N/A
app pub date -
Jan 31, 2001
filing date -
Jan 31, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention includes methods and apparatus for driving a cholesteric display system using a dynamic drive scheme. The dynamic drive scheme is used to drive the electrodes of the cholesteric display in order to provide desired pixel states. Pixel states are controlled by the voltage applied across the pixel. The present invention uses pulse width modulation (PWM) during the dynamic drive scheme in order to control the voltage applied across the pixels. PWM modulation may be used during any phase (e.g., preparation phase, selection phase, evolution phase, and/or final phase) of the dynamic drive waveform depending on the needs of the cholesteric display system.
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