Patent ID: 7612770

Claim:
A system for displaying images, comprising: a signal driving circuit comprising: a plurality of shift registers connected in series and controlled only by a first clock and a second clock, and operative to generate corresponding driving pulses in turn in response to a start pulse, wherein each of the shift registers comprises: a pulse generation unit with a first clock input terminal and operative to receive one of the first and the second clocks and a first power terminal coupled to a first power voltage; and a leakage protection unit coupled to the pulse generation unit, electrically separating the first power voltage from a clock signal received from the first clock and the second clock at first clock input terminal, wherein the leakage protection unit comprises: a first switching element comprising a first coupled to the first power terminal, a control terminal coupled to the start pulse, and a second terminal; a second switching element comprising a first terminal coupled to the second terminal of the switching element, and a second terminal coupled to a first node; a third switching element comprising a first terminal coupled to the first node, and a control terminal and a second terminal both coupled to the second clock input terminal; and a fourth switching element coupled between the first rower voltage on the first rower terminal and the received clock by the first clock input terminal in the pulse generation unit, and comprising a control terminal coupled to the first node.