Multi-color electro-optic displays
First Claim
1. An electro-optic display comprising at least first, second and third layers of electro-optic material, the first layer being capable of displaying at least one optical state which cannot be displayed by the second layer, and the third layer being capable of displaying at least one optical state which cannot be displayed by the first and second layers, the display further comprising a first electrode disposed on one side of the first, second and third layers, and a second electrode disposed on the opposed side of the first, second and third layers from the first electrode, there being no electrode between the first and second layers or between the second and third layers;
- wherein the first, second and third layers of electro-optic materials are stacked directly on top of the first electrode; and
wherein the second electrode is stacked directly on top of the third layer of electro-optic material.
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Abstract
An electro-optic display comprising at least two separate layers of electro-optic material, with one of these layers being capable of displaying at least one optical state which cannot be displayed by the other layer. The display is driven by a single set of electrodes between which both layers are sandwiched, the two layers being controllable at least partially independently of one another. Another form of the invention uses three different types of particles within a single electrophoretic layer, with the three types of particles being arranged to shutter independently of one another.
150 Citations
23 Claims
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1. An electro-optic display comprising at least first, second and third layers of electro-optic material, the first layer being capable of displaying at least one optical state which cannot be displayed by the second layer, and the third layer being capable of displaying at least one optical state which cannot be displayed by the first and second layers, the display further comprising a first electrode disposed on one side of the first, second and third layers, and a second electrode disposed on the opposed side of the first, second and third layers from the first electrode, there being no electrode between the first and second layers or between the second and third layers;
- wherein the first, second and third layers of electro-optic materials are stacked directly on top of the first electrode; and
wherein the second electrode is stacked directly on top of the third layer of electro-optic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- wherein the first, second and third layers of electro-optic materials are stacked directly on top of the first electrode; and
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19. An electro-optic display comprising first and second layers of cavities disposed adjacent one another with no electrode between the first and second layers, the sections of each of first and second layers of cavities lying adjacent the other layer being of substantially pyramidal form tapering towards the other layer, at least one of the first and second layers comprising colored particles dispersed in a fluid and capable of moving through the fluid on application of an electric field to the display;
- wherein the first and second layers of electro-optic materials are stacked directly on top of the first electrode; and
wherein the second electrode is stacked directly on top of the second layer of electro-optic material. - View Dependent Claims (20, 21)
- wherein the first and second layers of electro-optic materials are stacked directly on top of the first electrode; and
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22. An electro-optic display comprising at least first, second and third layers of electro-optic material, the display further comprising a first electrode disposed on one side of the first, second and third layers, and a second electrode disposed on the opposed side of the first, second and third layers from the first electrode, there being no electrode between the first and second layers, or between the second and third layers, the first, second and third layers having the following properties:
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(a) the first layer 1 has a voltage and/or impulse threshold, is state stable, and its color depends upon the polarity of the applied voltage; (b) the second layer has either a lower threshold than the first layer, is state stable, and its color depends upon the polarity of the applied voltage; and (c) the third layer has no threshold, is not state stable, switches faster than the second layer, and reaches the same state whether driven with a positive or a negative impulse and relaxes to its opposite extreme when no potential is applied;
wherein the first, second and third layers of electro-optic materials are stacked directly on top of the first electrode; and
wherein the second electrode is stacked directly on top of the third layer of electro-optic material. - View Dependent Claims (23)
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Specification