Patent ID: 9671668
Date: 2017-06-06
CPC Classifications: G02F,G09G

Claim:
1. A method for driving an electrophoretic display comprising a first surface on a viewing side, a second surface on a non-viewing side and an electrophoretic fluid which fluid is sandwiched between a common electrode and a layer of pixel electrodes and comprises a first type of particles, a second type of particles, a third type of particles, a fourth type of particles, a fifth type of particles and a sixth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein: (a) the six types of pigment particles have optical characteristics differing from one another; (b) the first and second types of particles carry opposite charge polarities; (c) the third and fifth types of particles carry the same charge polarity as the first type of particles, the first type having a higher zeta potential than the third type, and the third type having a higher zeta potential than the fifth type of particles; and (d) the fourth and sixth types of particles carry the same charge polarity as the second type of particles, the second type having a higher zeta potential than the fourth type, and the fourth type having a higher zeta potential than the sixth type, the method comprising: (i) applying a driving pulse or a pulsing waveform alternating between a driving voltage and no driving voltage, to a pixel in the electrophoretic display, wherein the pixel is in a color state of the first type of particles and the driving pulse or the driving voltage has a polarity driving the sixth type of particles towards the viewing side, to drive the pixel towards a color state of the sixth type of particles at the viewing side, or (ii) applying a driving pulse or a pulsing waveform of alternating between a driving voltage and no driving voltage, to a pixel in the electrophoretic display, wherein the pixel is in a color state of the second type of particles and the driving pulse or the driving voltage has a polarity driving the fifth type of particles towards the viewing side, to drive the pixel towards a color state of the fifth type of particles at the viewing side.