Liquid crystal display driver with threshold voltage drift compensation
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United States of America Patent
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Dec 23, 1997
Grant Date -
N/A
app pub date -
Mar 6, 1995
filing date -
Mar 6, 1995
priority date (Note) -
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Abstract
A shift register for scanning a liquid crystal display includes cascaded stages. A given stage is formed with an input transistor switch that is responsive to an output pulse of a stage upstream in the chain of the cascaded stages. An output pulse of the given stage is produced in a pull-up transistor of a push-pull amplifier. A pull-down transistor is responsive to a control signal that tracks a variation of a threshold voltage of the pull-down transistor. A difference between the control signal and the threshold voltage is maintained small in a manner to reduce a change in a conductivity of the pull-down transistor when a drift in the threshold voltage of the pull-down transistor occurs.
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