Patent ID: 8344979

Claim:
A method for over-driving a liquid crystal display (LCD), for compensating a gray level brightness of the LCD, the method comprising: outputting a current frame data by a data buffer unit; storing the current frame data into a frame memory unit, and outputting a previous frame data by the frame memory unit; searching several look-up tables (LUTs) for a driving voltage in a corresponding LUT according to the current frame data and the previous frame data; receiving the current frame data by a position scanning unit to determine a current position; and outputting the driving voltage by a multiplexer at the current position,. wherein the LCD has N horizontal scan lines, and the step of receiving the current frame data by the position scanning unit to determine the current position comprises: dividing the N horizontal scan lines into at least two regions; up-converting a data enable (DE) signal; starting a sequential counter to count and scan the N horizontal scan lines; when the counting and scanning operation is performed on one region of the at least two regions, determining by the position scanning unit that the current position is the region of the at least two regions; and when the counting and scanning operation is performed on another region of the at least two regions, determining by the position scanning unit that the current position is the other region.