Patent ID: 7573972

Claim:
A switch set for use in a bi-directional shift register module, the shift register module comprising a first shift register, a second shift register, and a third shift register, the second shift register coupled to the first shift register, the third shift register coupled to the second shift register, the shift register module sequentially transmitting shift register signals according to a first clock signal and an inversed clock signal of the first clock signal, the switch set comprising: a first switch device, comprising: a first control end for receiving a second clock signal; a second control end for receiving an inversed clock signal of the second clock signal; a third control end for receiving the second clock signal; a first input end for receiving a start signal; a second input end coupled to an output end of the second shift register; a first output end coupled to an input end of the first shift register for coupling the first input end of the first switch device to the input end of the first shift register when the second clock signal is at a first predetermined voltage; and a second output end coupled to the input end of the first shift register for coupling the second input end of the first switch device to the input end of the first shift register when the inversed clock signal of the second clock signal is at the first predetermined voltage; and a second switch device, comprising: a first control end for receiving the inversed clock signal of the second clock signal; a second control end for receiving the second clock signal; a third control end for receiving the inversed clock signal of the second clock signal; a first input end coupled to the output end of the first shift register; a second input end coupled to an output end of the third shift register; a first output end coupled to an input end of the second shift register for coupling the first input end of the second switch device to the input end of the second shift register when the inversed clock signal of the second clock signal is at the first predetermined voltage; and a second output end coupled to the input end of the second shift register for coupling the second input end of the second switch device to the input end of the second shift register when the second clock signal is at the first predetermined voltage.