Patent ID: 8217875

Claim:
A signal processing device for a liquid crystal display panel, the signal processing device comprising: a memory that stores image data provided from an external device in a frame unit and outputs previously stored image data of a previous frame, hereinafter referred to as previous image data, in response to image data of a present frame, hereinafter referred to as present image data; a look-up table that stores a plurality of reference gray scales therein, receives the present image data from the external device and the previous image data from the memory, and outputs a reference gray scale as previous compensation image data based on a combination of the present image data and the previous image data, the reference gray scale output from the look-up table corresponding to an image displayed on the liquid crystal display panel; a first data compensator that converts the present image data into first sub-image data and second sub-image data having a different gray scale from that of the first sub-image data and converts the previous compensation image data into third sub-image data and fourth sub-image data having a different gray scale from that of the third sub-image data; and a second data compensator that converts the first sub-image data into a first compensation image data using the first and third sub-image data from the first data compensator and converts the second sub-image data into a second compensation image data using the second and fourth sub-image data from the first data compensator.