Shift register that suppresses operation failure due to transistor threshold variations, and liquid crystal driving circuit including the shift register
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United States of America Patent
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Feb 26, 2008
Grant Date -
Sep 29, 2005
app pub date -
Mar 9, 2005
filing date -
Mar 29, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A shift register having a plurality of stages connected in cascade shifts an output signal by a plurality of clocks having different phases. Each of the stage includes an input diode to which a signal is input from a preceding stage, a capacitor for holding charge having a voltage level of the input signal, a first transistor that is turned on or off by the held voltage level to output an output signal to a following stage in synchronization with a clock signal, and a second transistor connected between the input diode and an output terminal. A control electrode of the second transistor is connected to the input diode in the following stage. The second transistor has a clamping function for discharging the accumulated charge and turning off the first transistor when the clock signal is phase-shifted.
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