Patent ID: 7952550

Claim:
A liquid crystal driver for driving a liquid crystal display panel which includes P source lines, P being a natural number, the driver comprising: a gray level voltage generator for generating N gray level voltages which have different voltage values from one another, N being a natural number; an operational amplifier for amplifying an input voltage; P selectors corresponding to the P source lines; P connection switching sections corresponding to the P selectors and disposed between the P selectors and the P source lines; and a controller for controlling the P connection switching sections, wherein: each of the P selectors receives pixel data indicative of a gray level to select one of the N gray level voltages generated by the gray level voltage generator which corresponds to the pixel data and outputs the selected gray level voltage, each of the P connection switching sections has a voltage write mode and a voltage retention mode, in the voltage write mode, each of the connection switching sections supplies an output of a corresponding one of the P selectors to the operational amplifier and supplies an output of the operational amplifier to a corresponding one of the P source lines, in the voltage retention mode, each of the connection switching sections supplies an output of a corresponding one of the P selectors to a corresponding one of the P source lines, and the controller is configured to: set each of the P connection switching sections into the voltage write mode at least once; for each of the P connection switching sections set into the voltage write mode, after passage of a first predetermined interval, shift said each of the P connection switching sections from the voltage write mode to the voltage retention mode; and after all of the P connection switching sections have been set to the voltage write mode at least once and shifted to the voltage retention mode, maintain all of the P connection switching sections in the voltage retention mode until a second predetermined interval passes.