Color electrophoretic display
First Claim
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1. An electrophoretic display comprising:
- an electrophoretic display fluid which comprises non-charged or slightly charged color particles, a first type of charged pigment particles, and a second type of charged pigment particles, all of which are dispersed in a solvent or solvent mixture, wherein the first and the second types of charged pigment particles are oppositely charged and one type has a color darker than the other type, and the non-charged or slightly charged color particles (i) remain stationary during operation of the display and are uniformly dispersed throughout the display fluid,and (ii) have a transparent polymeric matrix with dye molecules solubilized therein wherein the refractive index of the polymeric matrix matches that of the display fluid; and
a first layer on the viewing side comprising a common electrode and a second layer comprising pixel electrodes of different sizes, and the electrophoretic display fluid is sandwiched between the first and the second layers;
whereby in an area corresponding to a pair of a large pixel electrode and a small pixel electrode,(a) the color of the first type of charged pigment particles is displayed when the first type of charged pigment particles is at or near the first layer,(b) the color of the second type of charged pigment particles is displayed when the second type of charged pigment particles is at or near the first layer, and(c) the color of the non-charged or slightly charged color particles is displayed when the darker-colored charged pigment particles are at or near the small pixel electrode and the lighter-colored charged pigment particles are at or near the large pixel electrode.
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Abstract
This invention relates to an electrophoretic display fluid comprising non-charged or slightly charged color particles and at least one type of charged pigment particles, all dispersed in a solvent or solvent mixture, and an electrophoretic display device utilizing such a display fluid. The electrophoretic fluid of the present invention provides improved image qualities.
107 Citations
22 Claims
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1. An electrophoretic display comprising:
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an electrophoretic display fluid which comprises non-charged or slightly charged color particles, a first type of charged pigment particles, and a second type of charged pigment particles, all of which are dispersed in a solvent or solvent mixture, wherein the first and the second types of charged pigment particles are oppositely charged and one type has a color darker than the other type, and the non-charged or slightly charged color particles (i) remain stationary during operation of the display and are uniformly dispersed throughout the display fluid, and (ii) have a transparent polymeric matrix with dye molecules solubilized therein wherein the refractive index of the polymeric matrix matches that of the display fluid; and a first layer on the viewing side comprising a common electrode and a second layer comprising pixel electrodes of different sizes, and the electrophoretic display fluid is sandwiched between the first and the second layers; whereby in an area corresponding to a pair of a large pixel electrode and a small pixel electrode, (a) the color of the first type of charged pigment particles is displayed when the first type of charged pigment particles is at or near the first layer, (b) the color of the second type of charged pigment particles is displayed when the second type of charged pigment particles is at or near the first layer, and (c) the color of the non-charged or slightly charged color particles is displayed when the darker-colored charged pigment particles are at or near the small pixel electrode and the lighter-colored charged pigment particles are at or near the large pixel electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electrophoretic display comprising:
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an electrophoretic display fluid which comprises non-charged or slightly charged color particles and only one type of charged pigment particles, both of which are dispersed in a solvent or solvent mixture, wherein the non-charged or slightly charged color particles (i) remain stationary during operation of the display and are uniformly dispersed throughout the display fluid, and (ii) have a transparent polymeric matrix with dye molecules solubilized therein wherein the refractive index of the polymeric matrix matches that of the display fluid; a first layer on the viewing side comprising a common electrode and a second layer comprising in-plane and pixel electrodes, wherein the electrophoretic display fluid is sandwiched between the first and the second layers; and a background layer; whereby in an area corresponding to a set of in-plane and pixel electrodes, (a) the color of the charged pigment particles is displayed when the charged pigment particles are at or near the first layer, (b) the color of the background layer is displayed when the charged pigment particles are at or near the in-plane electrodes and the non-charged or slightly charged color particles are scattered in the display fluid, and (c) the color of the non-charged or slightly charged color particles is displayed when the charged pigment particles are at or near the second layer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification