Peripheral driver circuit of liquid crystal electro-optical device

Abstract

In a peripheral driver circuit of a liquid crystal electro-optical device is comprised of a shift register circuit arranged by a plurality of registers, and a circuit for supplying power to each register. When an input signal is entered into an nth register, a supply of power to at least a portion of registers other than the nth register is stopped. The shift register circuit is constructed of a P-channel type TFT and a resistor. The circuit for supplying the power controls the supply of power to the shift register by using the output of the shift register circuit. This circuit for supplying the power is arranged by a P-channel type TFT and a resistor. The consumption power of the circuit for supplying the power is equal to and lower than that of the shift register circuit.

1 . A semiconductor device comprising: 
 a plurality of pixels arranged in a matrix form;    a driver circuit for driving said pixels, said driver circuit comprising:    a shift register circuit having a serial-connected plurality of registers; and    a power supply circuit having a plurality of control circuits connected to each of said registers to supply power to each of said registers;    wherein when an input signal to said shift register circuit is held in nth register of said shift register circuit, the power supplied to registers except the nth, (n−1)th and (n+1)th register of said shift register circuit is decreased (n is an integer).