Patent ID: 6956549

Claim:
An LCD driver, comprising: a counter for counting input clocks for each image signal received, said counter adapted to return to the initial state thereof to repeat said counting as the count of said counter has reached a specified number; at least one comparator for comparing said count received from said counter and each image signal received, said comparator generating a sequence of pulses each having a prescribed duty factor in accordance with the magnitude of said image signal; a clock generator for generating at least one kind of clock having a frequency lower than the fundamental frequency of a fundamental clock, the clock generator adapted to select either one of said fundamental clock and said at least one kind of lower-frequency clock to provide said counter with the selected clock as said input clock; and a clock-switching instruction circuit for providing said clock generator with a selection signal that instructs said clock generator to select: said lower-frequency clock while said count of said counter does not exceed a first preset number after said counter started with a given initial number; said fundamental clock while said count exceeds said first preset number but does not exceed a second preset number; and said lower frequency clock when said count exceeds said second preset number.