Apparatus having a DAC-controlled ramp generator for applying voltages to individual pixels in a color electro-optic display device
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United States of America Patent
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-
Aug 6, 2002
Grant Date -
N/A
app pub date -
Mar 29, 2000
filing date -
Mar 29, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electro-optic display device, such as a liquid crystal display device which serves as a modulator for projected light, a global DAC controlled ramp generator is used in conjunction with track and hold circuit for each column of the display to convert incoming digital display signals to analog signals for all columns. Row address circuitry addresses each row of the display, thereby to address the individual pixels of the display device with such analog signals. The limitation on an increase in frame rate, resulting from the finite conversion time (cycle time) of the DAC and the finite speed of the track and hold circuits, is overcome by providing a multi-phase clock and multiplexer which enables a selection from among several analog levels during each ramp cycle.
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