Patent ID: 6380920
Filing Date: 2002-04-30
Classification: G09G

Abstract:
A drive circuit for an electro-optical device, to which N-bit digital image data is input (N is a positive integer), said drive circuit converting the digital image data to a voltage signal corresponding to one of 2N gray scales and supply the voltage signal to a signal line, comprising:a plurality of pairs of shift registers that latch signals respectively representing bits of the image data and for holding the latched signals; a D/A converter that performs D/A conversion of the image data latched by said shift registers N-bits by N-bits, to generate voltage signals corresponding to 2N gray scales and to supply the voltage signals to a signal line; and a switch group that selectively supplies said D/A converter with the image data latched by one of the shift registers of each of the plurality of pairs of shift registers, said plurality of pairs of shift registers repeatedly and alternatively performing an operation of supplying said D/A converter with image data held by one of the shift registers of each of said plurality of pairs of shift registers when image data is latched by an other one of the shift registers.