Power supply and reference voltage circuit for TFT LCD source driver
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United States of America Patent
Stats
-
Nov 8, 2005
Grant Date -
Nov 28, 2002
app pub date -
May 24, 2002
filing date -
May 24, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A liquid crystal power supply is provided which generates a high-precision drive power supply voltage supplied to a driver circuit by using a low-precision reference voltage generating circuit. The power supply circuit includes a DC/DC converter which generates a voltage having a size based on an oscillation signal from a power supply voltage and outputs the generated voltage as a drive power supply voltage; a stabilized power supply circuit which generates a highest-level reference potential for generating a gray-scale voltage in a driver circuit; a comparison unit which outputs a difference voltage according to a difference between the drive power supply voltage and the highest-level reference potential; an internal reference voltage generating unit; an error amplifying unit which amplifies a difference between the reference voltage and the difference voltage; and a PWM conversion unit which outputs an oscillation signal in response to the amplified difference.
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