Patent ID: 8134531

Claim:
A source line driver circuit of an active matrix type display device comprising: scanning lines; source lines intersecting with the scanning lines; a pixel portion including a plurality of pixels connected to the scanning lines and the source lines; a k (where k is an integer greater than or equal to 2) number of video signal lines to which video signals divided into a k number of signals are input; a first shift register that generates and outputs a plurality of first pulses, where a start pulse signal and a first clock signal are input to the first shift register, a writing starting period is synchronized with the start pulse signal, and writing finishing periods are delayed sequentially in accordance with the first clock signal; a second shift register that generates and outputs a second pulse, where the start pulse and a second clock signal, a period thereof being the same as a period of the first clock signal but a phase thereof being delayed, are input to the second shift register, a writing starting period is synchronized with the start pulse, and writing finishing periods are delayed sequentially in accordance with the second clock signal; a plurality of logic circuits, which perform logic operations on two adjacent first pulses of odd-numbered steps, where the logic circuits output portions in which the two first pulses do not overlap as sampling pulses of odd-numbered steps, and which perform logic operations on two adjacent second pulses of even-numbered steps, where the logic circuits output portions in which the two second pulses do not overlap as sampling pulses of even-numbered steps; a plurality of switches to which the source lines are connected and by which the source lines and the video signal lines conduct between each other in accordance with the sampling pulse, wherein a k number of the switches are connected to an output of the logic circuit, and wherein the k number of the switches connected to the same logic circuit are each connected to a different video signal line.