Patent ID: 6281890
Filing Date: 2001-08-28
Classification: G09G

Abstract:
A liquid crystal drive circuit for driving a liquid crystal panel, comprising:a shift register unit for receiving an input signal and clock, and outputting a signal obtained by shifting the input signal on the basis of the clock;an output selection circuit for receiving the signal output from said shift register unit, and a frame signal, and outputting a switching control signal;an output buffer for receiving the switching control signal, and at least two different voltages, and selecting and outputting one of the input voltages on the basis of the switching control signal;a selection control circuit for receiving the signal output from said shift register unit, and for, when the signal has a predetermined value, judging that an operation is abnormal and generating a selection control signal; anda clock control circuit for, when said selection control circuit generates the selection control signal, inputting a signal having a given value to said shift register unit in place of the clock to make said shift register unit operate as an inverter array.