Patent ID: 6697041
Filing Date: 2004-02-24
Classification: G09G

Abstract:
A display drive device includinga plurality of cascade connected drive circuits for driving a display element in accordance with an image data signal, each of the drive circuits comprising a hold memory for latching a predetermined amount of the time division incoming image data signal in accordance with a latch signal, each of the drive circuits converting the latched image data signal to an analog signal and supplying the analog signal to the display element, wherein a latch signal generator circuit is provided in the drive circuit located in the last stage of the plurality of cascade connected drive circuits for generating the latch signal, wherein each of the drive circuits includes: a shift register for shifting and transmitting a start pulse signal in synchronization with a clock signal; a sampling memory for sampling and storing the time division incoming image data signal in accordance with an output signal of each stage of the shift register; a hold memory for latching the predetermined amount of the image data signal in accordance with the latch signal; and an output circuit for converting the latched image data signal to an analog signal and supplying the analog signal to the display element, wherein the latch signal generator circuit provided in the last stage is a delay circuit that generates the latch signal based on the start pulse signal supplied by the drive circuit in the last stage.