Shift register and control method thereof
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United States of America Patent
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Jan 10, 2017
Grant Date -
Jul 23, 2015
app pub date -
Jan 13, 2015
filing date -
Jan 20, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A shift register has a first switch, a pull-up circuit, and a pull-down circuit. The first switch receives a first clock signal. The pull-up circuit is configured to turn on the first switch to pull up a voltage level of an output terminal of the shift register. The pull-up circuit has a second switch and a first control circuit. The first control circuit is coupled to a first system power terminal to avoid an excessive voltage difference between two nodes of the first control circuit. The pull-down circuit is configured to pull down the voltage level of the output terminal of the shift register when the first switch is turned off, and further configured to keep a voltage level of a control node of a switch coupled between the output terminal and a second system power terminal at a low voltage.
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