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

Claim 6:
7. 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;
(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,

wherein the controller is configured to cause the colors white, yellow, red, magenta, blue, cyan, green, and black color to be displayed at the viewing surface by providing one of a plurality of time dependent drive voltages to the backplane electrode while providing 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.