Liquid crystal display and method for driving the same

1. A liquid crystal display comprising:

a frame processor that performs data compensation of at least one horizontal line carrying no data among horizontal lines of an input current frame;

a timing controller that controls a driving operation of the frame compensated by the frame processor; and

a data driver that supplies the frame compensated by the frame processor to a liquid crystal display panel under control of the timing controller,

wherein the frame processor compares a current frame with previous frames, generates a compensation approval signal according to a comparison result and inserts compensation data into horizontal lines carrying no data among horizontal lines of the current frame in response to the compensation approval signal, and

wherein data of the current frame and data of a second last frame to be supplied the liquid crystal display panel have the same polarity while the data of the current frame and data of a last frame to be supplied to the liquid crystal display panel have an opposite polarity,

wherein the frame processor includes:

a frame memory that stores the last frame and the second last frame that have been input before the current frame;

a comparator that compares the current frame with the last and second last frames stored in the frame memory, generates a first compensation approval signal when the current frame and the second last frame are identical while the current frame and the last frame are different, and generates a frame pattern recognition signal when a regular frame pattern, which repeats regularly every 3 frames, is recognized, a history counter that receives the frame pattern recognition signal from the comparator and counts the number of occurrences of the regular frame pattern and generates a second compensation approval signal when the counted number of occurrences of the regular frame pattern is equal to a predetermined reference frame pattern count, and

a data compensator that performs data compensation of at least one horizontal line carrying no data among horizontal lines of the current frame only the first compensation approval signal from the comparator and the second compensation approval signal from the history counter are inputted.

2. The liquid crystal display according to claim 1 , wherein the current frame, the last frame and the second last frame each include a progressive pattern.

3. The liquid crystal display according to claim 1 , wherein the compensation data is preset in the data compensator.

4. The liquid crystal display according to claim 1 , wherein the compensation data is an average of data of input odd and even frames.

5. The liquid crystal display according to claim 1 , wherein the compensation data is data of a highest gray level among data of input odd and even frames.

6. The liquid crystal display according to claim 1 , wherein the compensation data is data of a lowest gray level among data of input odd and even frames.

7. The liquid crystal display according to claim 1 , wherein the timing controller and the frame processor are implemented as a single chip.

8. The liquid crystal display according to claim 1 , wherein the frame processor further includes:

a frame compressor that compresses and stores an input frame in the frame memory;

a first restoration unit that decompresses a current frame compressed by the frame compressor to restore the current frame before compression and outputs the restored current frame to the comparator; and

a second restoration unit that reads a compressed previous frame from the frame memory and decompresses the compressed previous frame to restore a previous frame before compression and outputs the restored previous frame to the comparator.

9. The liquid crystal display according to claim 8 , wherein, when the current frame restored by the first restoration unit is input, the comparator generates and outputs a read signal to the second restoration unit.

10. The liquid crystal display according to claim 9 , wherein the second restoration unit reads previous frames stored in the frame memory in response to the read signal.