Method of gray scale generation for displays using a sample and hold circuit with a variable reference voltage
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United States of America Patent
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N/A
Issued Date -
May 30, 2002
app pub date -
Nov 29, 2000
filing date -
Nov 29, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A circuit and method for generating pulse width modulated signal from an analog video signal. The circuit includes a pulse width modulated signal generating circuit portion and a voltage sampling circuit portion. The voltage sampling circuit portion includes a first switch, a voltage storage device for storing a portion of the analog video signal as a voltage value according to the first switch activated according to sample time information within a portion of time of the analog video signal, and a second switch for outputting the stored voltage value to the pulse width modulated signal generating circuit portion when activated according to a next portion of time of the analog video signal. When the stored voltage value is outputted to the pulse width modulated signal generating circuit, the pulse width modulated signal generating circuit portion for generating a pulse width modulated signal by comparing the outputted voltage value to a waveform.
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