Patent ID: 8355196

Claim:
An electrophoretic display device comprising: a plurality of pixel electrodes; a common electrode; and an electrophoretic ink layer comprising a plurality of cavities, each cavity being arranged between one of the pixel electrodes and the common electrode, and comprising a suspension fluid with a black color, a plurality of first type charged particles dispersed in the suspension fluid, and a plurality of second type charged particles dispersed in the suspension fluid; wherein, three cavities constitutes a pixel unit, the first type charged particles and the second type charged particles in each pixel unit are one of red, green, and blue (RGB) particles, and one of yellow, magenta, and cyan (YMC) particles, respectively; when applying a voltage to one of the pixel electrodes by causing the RGB particles and the YMC particles both to move away from the common electrode, the cavity corresponding to the pixel electrode displays the black color of the suspension fluid; when only one cavity of one pixel unit displays the black color, the pixel unit displays a mixed color combined by two of the RGB particles or YMC particles; when two cavities of one pixel unit display the black color, the pixel unit displays the color of one of the RGB particles or YMC particles; and when three cavities of one pixel unit all display black color, the pixel unit displays the black color.