Color display device
First Claim
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1. An electrophoretic fluid comprising a first type of pigment particles, a second type of pigment particles and a third type of pigment particles, all of which are dispersed in a solvent or solvent mixture, wherein:
- (a) the first type of pigment particles and the second type of pigment particles carry opposite charge polarities;
(b) the third type of pigment particles has a charge level being less than about 50% of the charge level of the first type or the second type of pigment particles; and
(c) the three types of pigment particles have different levels of threshold voltage, or different levels of mobility, or both.
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Abstract
The present invention provides a solution for a highlight or multicolor display device, in which each display cell can display high quality color states. More specifically, an electrophoretic fluid is provided which comprises three types of pigment particles, having different levels of size, threshold voltage or charge intensity.
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Citations
22 Claims
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1. An electrophoretic fluid comprising a first type of pigment particles, a second type of pigment particles and a third type of pigment particles, all of which are dispersed in a solvent or solvent mixture, wherein:
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(a) the first type of pigment particles and the second type of pigment particles carry opposite charge polarities; (b) the third type of pigment particles has a charge level being less than about 50% of the charge level of the first type or the second type of pigment particles; and (c) the three types of pigment particles have different levels of threshold voltage, or different levels of mobility, or both. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification