Source drive amplifier for flat panel display
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United States of America Patent
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N/A
Issued Date -
Dec 20, 2007
app pub date -
Jun 15, 2006
filing date -
Jun 15, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An output buffer (100) for a TFT-LCD display device includes a push-pull output stage having a first device (Mp) for supplying current to an output (Vout) and a second device (Mn) for drawing current from the output. A first pre-amplifier (101) is coupled to an input (Vin) of the buffer for driving the first device to supply current to the output. A second pre-amplifier (102) is coupled to the input of the buffer for driving the second device to draw current from the output. A first switchable offset is associated with the first pre-amplifier (101) and a second switchable offset is associated with the second pre-amplifier (102). A switchable current source (Ip) is configured to supply current to the output and a switchable current sink (In) is configured to draw current from the output. A switching input O.sub.1 configured to activate both the first switchable offset and the switchable current source, and a complementary switching input O.sub.2 is configured to activate the second switchable offset and the switchable current sink.
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