Color display device
First Claim
1. An electrophoretic display comprising a first surface on a viewing side, a second surface on a non-viewing side, and an electrophoretic fluid sandwiched between a common electrode at the viewing side and a layer of pixel electrodes at the non-viewing side;
- the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein;
(a) the five 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 fourth types of particles carry the same charge polarity as the first type of particles, and the first type, the third type and the fourth type of particles have progressively lower magnitudes; and
(d) the fifth type of particles carries the same charge polarity as the second type of particles, but their magnitude is lower than that of the second type of particles; and
wherein application, to a pixel, of a mid-driving voltage causes a mixture of the particles of the first type and second type to stay in middle of the pixel and causes the particles of the third type to break away from the mixture and move at or near the viewing side; and
wherein the application of the mid-driving voltage further causes the particles of the fifth type to break away from the mixture and move at or near the pixel electrode.
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Accused Products
Abstract
The present invention is directed to a color display device in which each pixel can display at least five high-quality color states, and an electrophoretic fluid for such an electrophoretic display. In one aspect, the different types of particles exhibit different levels of attraction force to display different color states. In another aspect, the different types of particles exhibit different levels of mobility in different driving voltage ranges to display different color states.
232 Citations
20 Claims
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1. An electrophoretic display comprising a first surface on a viewing side, a second surface on a non-viewing side, and an electrophoretic fluid sandwiched between a common electrode at the viewing side and a layer of pixel electrodes at the non-viewing side;
- the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein;
(a) the five 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 fourth types of particles carry the same charge polarity as the first type of particles, and the first type, the third type and the fourth type of particles have progressively lower magnitudes; and (d) the fifth type of particles carries the same charge polarity as the second type of particles, but their magnitude is lower than that of the second type of particles; and wherein application, to a pixel, of a mid-driving voltage causes a mixture of the particles of the first type and second type to stay in middle of the pixel and causes the particles of the third type to break away from the mixture and move at or near the viewing side; and wherein the application of the mid-driving voltage further causes the particles of the fifth type to break away from the mixture and move at or near the pixel electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18)
- the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein;
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10. An electrophoretic display comprising a first surface on a viewing side, a second surface on a non-viewing side and an electrophoretic fluid sandwiched between a common electrode at the viewing side and a layer of pixel electrodes at the non-viewing side;
- the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein;
(a) the five 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 fourth types of particles carry the same charge polarity as the first type of particles, and the first type, the third type and the fourth type have progressively lower magnitudes; and (d) the fifth type of particles carries the same charge polarity as the second type of particles, but their magnitude is lower than that of the second type of particles; and (i) application, to a pixel, of a first high driving voltage having the same polarity as that of the first type of particles causes the pixel to show the color of the first type of particles at the viewing side and have the second type of particles at or near the pixel electrode, wherein the first high driving voltage causes the particles of the third type to stay near the viewing side and below the particles of the first type and causes the particles of the fourth type to stay near the viewing side and below the particles of the third type; (ii) application, to a pixel, of a second high driving voltage having the same polarity as that of the second type of particles causes the pixel to show the color of the second type of particles at the viewing side and have the first type of particles at or near the pixel electrode, wherein the second high driving voltage causes the particles of the fifth type to stay near the viewing side and below the particles of the second type; (iii) application, to a pixel, of a first low driving voltage having the same polarity as that of the fourth type of particles causes the pixel to show the color of the fourth type of particles at the viewing side and have the fifth type of particles at or near the pixel electrode, wherein the particles of the first, second and third types stay in middle of the pixel in a mixed state as the first low driving voltage is not strong enough to overcome attraction forces between the particles of the first, second and third; and (iv) application, to a pixel, of a second low driving voltage having the same polarity as that of the fifth type of particles causes the pixel to show the color of the fifth type of particles at the viewing side and have the fourth type of particles at or near the pixel electrode, wherein the particles of the first, second and third types stay in middle of the pixel in a mixed state as the second low driving voltage is not strong enough to overcome attraction forces between the particles of the first, second and third. - View Dependent Claims (11)
- the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein;
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19. An electrophoretic display comprising a first surface on the viewing side, a second surface on the non-viewing side and an electrophoretic fluid which fluid is sandwiched between a common electrode and a layer of pixel electrodes at the non-viewing side;
- the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of, all of which are dispersed in a solvent or solvent mixture, wherein;
(a) the five types of pigment particles have optical characteristics differing from one another; (b) the first and second types of particles carry opposite charge polarities; and (c) the third, fourth and fifth types of particles carry the same charge polarity as the first type of particles and the first type, third type, fourth type and fifth type of particles have progressively lower magnitudes; and wherein application, to a pixel, of a higher medium driving voltage causes a mixture of the particles of the first type and the second type to stay in middle of the pixel and causes the particles of the third type to break away from the mixture and move at or near the viewing side. - View Dependent Claims (20)
- the electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles, a fourth type of particles and a fifth type of, all of which are dispersed in a solvent or solvent mixture, wherein;
Specification