Source driver of liquid crystal display and the driving method
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United States of America Patent
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Feb 5, 2008
Grant Date -
Jan 3, 2008
app pub date -
Jun 30, 2006
filing date -
Jun 30, 2006
priority date (Note) -
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Abstract
A source driver has many channels, and each channel has a DAC, a clamp circuit and a fine tune circuit. The DAC selects a first reference voltage and a second reference voltage from a plurality of gamma voltages according to (N-1) most significant bits of an N-bit signal. The clamp circuit receives the two reference voltages and clamps an output voltage between the two reference voltages. The fine tune circuit adjusts the clamped output voltage to a target level according to the least significant bit of the N-bit signal.
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