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

Claim 3:
4. 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 particles being light-scattering particles and the second particles 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
applying drive voltages including a first high voltage and a first low voltage to the light transmissive electrode, and drive voltages including a second high voltage, a zero voltage, and a second low voltage to the backplane electrode, such that the colors white, yellow, red, magenta, blue, cyan, green, and black are displayed at the viewing surface, wherein the magnitudes of at least two of the first high voltage, the first low voltage, the second high voltage, and the second low voltage are not the same, and wherein the drive voltages provided to the light-transmissive electrode comprise one of the following:
the first high voltage for a first time, the first low voltage for a second time, and the first high voltage for a third time; or
the first low voltage for a first time, the first high voltage for a second time, and the first low voltage for a third time.