Patent ID: 8319726

Claim:
A controller for controlling an electrophoretic display device, the electrophoretic display device including: a display unit having a plurality of pixels, each of the plurality of pixels having: an electrophoretic element containing a plurality of electrophoretic particles being sandwiched between a pixel electrode and a common electrode that face each other, the controller controlling the electrophoretic display so that the electrophoretic display is driven by a driving method comprising: during a first partial rewriting period, when an image that is displayed on the display unit is rewritten, partially rewriting the image that is displayed on the display unit by: supplying a common voltage to the common electrode, supplying a second voltage to the pixel electrode of each of first pixels among the above-mentioned plurality of pixels, the above-mentioned each of the first pixels displaying a first gradation before the rewriting of the image and then displaying a second gradation that is different from the first gradation after the rewriting of the image, the second voltage being set so as to correspond to the second gradation, and supplying a voltage that is the same as the common voltage to the pixel electrode of each of pixels other than the first pixels among the above-mentioned plurality of pixels or putting the pixel electrode of each of pixels other than the first pixels among the above-mentioned plurality of pixels into a high impedance state; and during a second partial rewriting period, when the image that is displayed on the display unit is rewritten, partially rewriting the image that is displayed on the display unit by: supplying the common voltage to the common electrode, supplying a first voltage to the pixel electrode of each of second pixels among the above-mentioned plurality of pixels, the above-mentioned each of the second pixels displaying the second gradation before the rewriting of the image and then displaying the first gradation after the rewriting of the image, the first voltage being set so as to correspond to the first gradation, and supplying a voltage that is the same as the common voltage to the pixel electrode of each of pixels other than the second pixels among the above-mentioned plurality of pixels or putting the pixel electrode of each of pixels other than the second pixels among the above-mentioned plurality of pixels into a high impedance state.