Patent ID: 8378943

Claim:
A signal processing device for a liquid crystal display panel, the signal processing device comprising: a memory that stores an image data provided from an external device in a frame unit and outputs a previously stored image data of a previous frame, hereinafter referred to as a previous image data, in response to an image data of a present frame, hereinafter referred to as a 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 the reference gray scale as a 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 a first sub-image data and a 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 a third sub-image data and a 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, wherein the second data compensator comprises: a first look-up table that stores a plurality of first reference compensation values added to the gray scale of the first sub-image data and outputs a first reference compensation value mapped by the first and third sub-image data provided from the first data compensator; a first dynamic capacitance compensation converter that calculates the first sub-image data from the first data compensator and the first reference compensation value from the first look-up table to generate the first compensation image data; a second look-up table that stores a plurality of second reference compensation values added to the gray scale of the second sub-image data and outputs a second reference compensation value mapped by the second and fourth sub-image data provided from the first data compensator; a calculator that calculates the second reference compensation value from the second look-up table with a predetermined variable to convert the second reference compensation value into a third reference compensation value; and a second dynamic capacitance compensation converter that calculates the second sub-image data from the first data compensator with the third reference compensation value from the calculator to generate the second compensation image data.