Patent ID: 7884793

Claim:
A liquid crystal display comprising: a liquid crystal panel assembly including a plurality of pixels; a gray signal modifier generating a modified gray signal; and a data driver converting the modified gray signal into corresponding image signals to provide for the pixels. wherein the gray signal modifier comprises: a frame memory storing data segments of a current gray signal and a previous gray signal; a buffer memory unit receiving data segments of the current gray signal from an external source, providing the data segments of the current gray signal for the frame memory, and receiving and storing the data segments of the previous gray signal stored in the frame memory; and a gray signal converter converting all of the data segments of the current gray signal from an external source into the modified gray signal based on the data segments of the previous gray signal stored in the buffer memory, the data segments of current gray signal, and a lookup table, wherein the data segments of the current gray signal are converted into the modified gray signal to improve the response speed of liquid crystal molecules in the liquid crystal panel assembly, and wherein the buffer memory unit comprises: a write buffer memory unit performing write-in operation for storing a first data segment of the current gray signal and performing read-out operation for reading a second data segment of the current gray signal stored therein to provide for the frame memory; and a read buffer memory unit performing write-in operation for storing a first data segment of the previous gray signal from the frame memory and performing read-out operation for reading a second data segment of the previous gray signal stored therein to provide for the converter, and wherein each of the write buffer memory unit and the read buffer memory unit comprises a buffer memory simultaneously performing read-out operation and write-in operation, and wherein the read-out operation of the write buffer memory unit is faster than the write-in operation of the write buffer memory unit, and the write-in operation of the read buffer memory unit is faster than the read-out operation of the read buffer memory.