Patent ID: 7868868

Claim:
A shift register for a liquid crystal display, comprising: control means for receiving a high-level supply voltage and a first multi-step clock signal to generate a first control signal using the high-level supply voltage in response to any one of a start pulse and an output signal of a previous stage and to generate a second control signal using the high-level supply voltage in response to the first multi-step clock signal; and output means for receiving a second multi-step clock signal and applying the second multi-step clock signal to an output node in response to the first control signal to generate a multi-step output signal and for discharging the output node in response to the second control signal, wherein each of the first multi-step clock signal, the second multi-step clock signal and the output multi-step signal has a high level and a low level, and the high level has a first voltage level in the first period of the high level and a second voltage level lower than the first voltage level in the latter period of the high level.