Patent ID: 7583245

Claim:
A method of driving a memory in a liquid crystal display device comprising: storing current frame data in an input line memory at a first speed; reading the current frame data the input line memory at a second speed faster than the first speed, and storing the current frame data read from the input line memory in a frame memory at the second speed; reading a previous frame data stored in the frame memory at the second speed, and storing the previous frame data read from the frame memory in an output line memory at the second speed; reading the previous frame data stored in the output line memory at the first speed; comparing the current frame data with the previous frame data read from the output line memory at the first speed; and selecting a predetermined modulation data in accordance with the result of the comparison, wherein storing the current frame data in the input line memory by the first speed comprises: storing an odd-numbered line data of the current frame data in a fist input line memory at the first speed during an odd-numbered line period, and storing an even-numbered line data of the current frame data in a second input line memory at the first speed during an even-numbered line period, and wherein storing the current frame data stored in the input line memory by the second speed in the frame memory includes: storing the odd-numbered line data of the current frame data stored in the first input line memory in the frame memory during a ½ period of the even-numbered line period; and storing the even-numbered line of the current frame data stored in the second input line memory of the frame memory during a ½ period of the odd-numbered line period.