Color display device with color filters
First Claim
Patent Images
1. A display device comprising:
- (a) an electrophoretic medium comprising a first type of particles, a second type of particles and a third type of particles, all dispersed in a solvent or solvent mixture;
the first, second and third types of particles having respectively first, second and third optical characteristics differing from one another;
the first type of particles having a charge of one polarity and the second and third types of particles having charges of the opposite polarity, and the second type of particles having an electric field threshold characteristic; and
(b) a plurality of pixels wherein each pixel has three sub-pixels, two of the three sub-pixels each has a color filter, wherein the two color filters and the third type of particles have three different colors, and the third sub-pixel has a color filter which is clear and colorless or has no color filter.
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Abstract
The present invention provides a multicolor display device which can display high quality color states. More specifically, an electrophoretic fluid is provided which comprises three or four types of particles and color filters are placed on the viewing side of the display device.
219 Citations
20 Claims
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1. A display device comprising:
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(a) an electrophoretic medium comprising a first type of particles, a second type of particles and a third type of particles, all dispersed in a solvent or solvent mixture;
the first, second and third types of particles having respectively first, second and third optical characteristics differing from one another;
the first type of particles having a charge of one polarity and the second and third types of particles having charges of the opposite polarity, and the second type of particles having an electric field threshold characteristic; and(b) a plurality of pixels wherein each pixel has three sub-pixels, two of the three sub-pixels each has a color filter, wherein the two color filters and the third type of particles have three different colors, and the third sub-pixel has a color filter which is clear and colorless or has no color filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 18, 19)
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11. A display device comprising
(a) an electrophoretic medium comprising a first type of particles, a second type of particles, a third type of particles and a fourth type of particles, all dispersed in a solvent or solvent mixture; - the first, second, third and fourth types of particles having respectively first, second, third and fourth optical characteristics differing from one another and two of the four types of particles being non-white and non-black;
the first type of particles having a high positive charge, the second type of particles having a high negative charge, the third type of particles having a low positive charge, and the fourth type of particles having a low negative charge; and(b) a plurality of pixels wherein each pixel has three sub-pixels, one of the sub-pixels has a color filter which color filter and the two types of non-white and non-black particles have three different colors, and the remaining two sub-pixels have color filters which are clear and colorless or have no color filter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 20)
- the first, second, third and fourth types of particles having respectively first, second, third and fourth optical characteristics differing from one another and two of the four types of particles being non-white and non-black;
Specification