Patent ID: 8503063

Claim:
A multi-color display device comprising a plurality of microcups, wherein a) said microcups are separated by partition walls, b) each of said microcups is filled with a display fluid comprising white charged pigment particles dispersed in a solvent of a color selected from the group consisting of dark red, dark green, and dark blue wherein the dark red, dark green and dark blue appear black at a high level of color density, and the solvent is not of the same color in all the microcups, c) said microcups are sandwiched between a first layer and a second layer wherein said first layer comprises a common electrode and said second layer comprises a plurality of pixel electrodes, and d) each area corresponding to a pixel electrode displays a white color state by driving the white charged pigment particles to be near or at the common electrode, displays a dark color state which appears black by driving the white charged pigment particles to be near or at the pixel electrode, and displays a medium color of the solvent by driving the white charged pigment particles to an area between the common electrode and the pixel electrode, wherein the medium color of the solvent has a reflectance at least five times the reflectance of the dark color state.