Patent ID: 8854351

Claim:
A method of driving an electrophoretic display device displaying an image during an image frame divided into a plurality of sub-frames, the method comprising: determining sub-frame periods of the plurality of sub-frames based on a predetermined resolution of the image, the plurality of sub-frames having sub-frame periods that differ from one another; initializing a plurality of unit pixels included in the electrophoretic display device by applying a common voltage to a common electrode and by applying a first voltage to a plurality of pixel electrodes, each pixel electrode corresponding to a respective one of the plurality of unit pixels; and controlling gray levels of the plurality of unit pixels by selectively applying one of the common voltage and a second voltage to each pixel electrode during each sub-frame, wherein the plurality of sub-frames include first through n-th sub-frames, where n is a natural number>=two, and wherein a sub-frame period of a k-th sub-frame is greater than a sub-frame period of a (k−1)-th sub-frame, where k is a natural number>=two and <=n; and wherein a first unit pixel of the plurality of unit pixels has a darkest gray level when the second voltage is applied to a first pixel electrode corresponding to the first unit pixel during an entire period of the first sub-frame through the n-th sub-frame, and wherein a second unit pixel of the plurality of unit pixels has a lightest gray level when the common voltage is applied to a second pixel electrode corresponding to the second unit pixel during the entire period of the first sub-frame through the n-th sub-frame.