Low power source driver for liquid crystal display
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United States of America Patent
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May 23, 2006
Issued Date -
N/A
app pub date -
Jun 25, 2003
filing date -
Jun 25, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is a source driver for receiving an input voltage and generating an output voltage to drive a data line in a liquid crystal display apparatus. In the source driver, first and second P-channel MOS transistors are together used as a primary source follower to trace the input voltage thereby eliminating the body effect and keeping the loading charge loss constant. First and second N-channel MOS transistors are used, as a secondary source follower. A capacitor is used for boosting the voltage of the drain of the first N-channel MOS transistor on the level of at least the input voltage plus the threshold voltage of the N-channel MOS transistor. In addition, an extra switch is used to reach the accurate output voltage when the output voltage is approaching the input voltage.
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