Patent ID: 6980203
Filing Date: 2005-12-27
Classification: G09G

Abstract:
1. A display driver circuit which drives a plurality of signal electrodes in a display panel which also has a plurality of scan electrodes intersecting the signal electrodes by multi-line selection in which three lines are simultaneously selected, the display driver circuit comprising: a RAM which stores display data for driving the display panel, the display data for two lines being read out at a time from the RAM; first to fourth latch circuits which retain the display data read from the RAM; a selector circuit which selects the display data for three consecutive lines from among the display data retained in the first to fourth latch circuits and outputs the selected display data, based on a given select control signal; and a signal electrode driver circuit which drives the signal electrodes by using given operation results based on the display data for three lines selectively output from the selector circuit; wherein the first and second latch circuits retain the display data for first and second lines which is collectively read from the RAM on the falling edge of a first clock signal; and wherein the third and fourth latch circuits retain the display data for third and fourth lines which is collectively read from the RAM after the reading of the display data for the first and second lines, on the falling edge of a second clock signal obtained by dividing the first clock signal from the rising edge of the first clock signal.