Patent ID: 11948523
Assignee: E INK CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A method, comprising:
providing a color electrophoretic display comprising a controller; a light-transmissive electrode at a viewing surface; a backplane electrode; and a color electrophoretic medium disposed between the light-transmissive electrode and the backplane electrode, the color electrophoretic medium comprising (a) a fluid; (b) a plurality of first and a plurality of second particles dispersed in the fluid, the first and second particles bearing charges of opposite polarity, the first particle being a light-scattering particle and the second particle having one of the subtractive primary colors; and (c) a plurality of third and a plurality of fourth particles dispersed in the fluid, the third and fourth particles bearing charges of opposite polarity, the third and fourth particles each having a subtractive primary color different from each other and from the second particles; and
causing the colors white, yellow, red, magenta, blue, cyan, green, and black color to be displayed at the viewing surface of the color electrophoretic display by applying one of a plurality of time dependent drive voltages to the backplane electrode while applying one of the following drive voltages to the light-transmissive electrode:
a high voltage for a first time, a low voltage for a second time, and a high voltage for a third time, or
a low voltage for a first time, a high voltage for a second time, and a low voltage for a third time.