Electro-optic displays, and materials and methods for production thereof

• US 7,843,624 B2
• Filed: 06/25/2008
• Issued: 11/30/2010
• Est. Priority Date: 03/08/2006
• Status: Active Grant

• Current Assignee: E Ink Corporation (E Ink Holdings Incorporated)
• Original Assignee: E Ink Corporation (E Ink Holdings Incorporated)
• Inventors: Danner, Guy M., Northrop, Valerie C., Rifai, Sandra
• Primary Examiner(s): Choi; William C
• Application Number:
  US12/146,063
• Publication Number:
  US 20080316582A1
• Time in Patent Office: 888 Days
• Field of Search: 359/245, 359/254, 359/296, 345/107, 430/32, 204/600
• US Class Current: 359/296
• CPC Class Codes: G02B 26/026 based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements

Abstract

A first sub-assembly useful in an electro-optic display is produced by: providing an electro-optic sub-assembly comprising a layer of electro-optic medium; providing an adhesive sub-assembly comprising an adhesive layer, the adhesive layer being larger than the layer of electro-optic medium and having one or more apertures; adhering the adhesive sub-assembly to the electro-optic sub-assembly so that a part of the adhesive layer adheres to the layer of electro-optic medium but the aperture(s) are spaced from the layer of electro-optic medium. A second sub-assembly comprises a conductive layer and a layer of electro-optic medium. The conductive layer has a main section covered by the electro-optic medium, an exposed section free from the electro-optic medium, and a weak section connecting the main section and the exposed section, so that the exposed section can be manipulated to rupture the weak section, thus separating the exposed section from the main section without substantial damage.

Claims

1. A process for the production of an article of manufacture useful in the production of an electro-optic display, the process comprising:

providing an electro-optic sub-assembly comprising a layer of electro-optic medium;

providing an adhesive sub-assembly comprising an adhesive layer, the adhesive layer being larger in at least one dimension than the layer of electro-optic medium, the adhesive layer having at least one aperture extending therethrough; and

adhering the adhesive sub-assembly to the electro-optic sub-assembly so that a part of the adhesive layer adheres to the layer of electro-optic medium but the at least one aperture in the adhesive layer is spaced from the layer of electro-optic medium.

2. A process according to claim 1 wherein the electro-optic sub-assembly comprises a light-transmissive electrically-conductive layer.

3. A process according to claim 2 wherein the electro-optic sub-assembly further comprises at least one supporting or protective layer on the opposed side of the electrically-conductive layer from the layer of electro-optic medium.

4. A process according to claim 1 wherein the electro-optic sub-assembly comprises a second adhesive layer disposed on one surface of the layer of electro-optic medium, and wherein, the adhesive sub-assembly is adhered to the surface of the layer of electro-optic medium not covered by the second adhesive layer.

5. A process according to claim 4 wherein the electro-optic sub-assembly further comprises a release sheet covering the surface of the second adhesive layer remote from the layer of electro-optic medium.

6. A process according to claim 1 wherein the electro-optic sub-assembly comprises a release sheet covering the surface of the layer of electro-optic medium to be adhered to the adhesive sub-assembly, this release sheet being removed from the layer of electro-optic medium before the layer of electro-optic medium is contacted with the adhesive sub-assembly.

7. A process according to claim 1 wherein the adhesive sub-assembly comprises a release sheet covering one surface of the adhesive layer.

8. A process according to claim 7 wherein the at least one aperture in the adhesive layer continues through the release sheet.

9. A process according to claim 1 wherein the electro-optic medium is a rotating bichromal member or electrochromic medium.

10. A process according to claim 1 wherein the electro-optic medium is an electrophoretic material comprising a plurality of electrically charged particles disposed in a fluid and capable of moving through the fluid under the influence of an electric field.

11. A process according to claim 10 wherein the electrically charged particles and the fluid are confined within a plurality of capsules or microcells.

12. A process according to claim 10 wherein the electrophoretic material is of the polymer-dispersed type, with the electrically charged particles and the fluid present as a plurality of discrete droplets surrounded by a continuous phase comprising a polymeric material.

13. A process according to claim 10 wherein the fluid is gaseous.

14. A sub-assembly useful in the production of an electro-optic display, the sub-assembly comprising:

a layer of electro-optic medium; and

an adhesive layer larger in at least one dimension than the layer of electro-optic medium, the adhesive layer having at least one aperture extending therethrough;

a part of the adhesive layer adhering to the layer of electro-optic medium but the at least one aperture in the adhesive layer being spaced from the layer of electro-optic medium.

15. A sub-assembly according to claim 14 wherein a plurality of discrete areas of the layers of electro-optic medium are disposed on a substrate, the discrete areas being separated by lands free from the electro-optic medium, and wherein a plurality of apertures pass through the adhesive layer, one end of each aperture terminating in one of the lands.

16. An electro-optic display comprising a sub-assembly according to claim 15 and a backplane adhered to the adhesive layer, the backplane comprising at least one first electrode disposed adjacent the layer of electro-optic medium and at least one second electrode spaced from the layer of electro-optic medium, the at least one second electrode being in electrical contact with the light-transmissive electrically-conductive layer via the at least one aperture in the adhesive layer.

17. An electronic book reader, portable computer, tablet computer, cellular telephone, smart card, sign, watch, shelf label or flash drive comprising a display according to claim 16.

18. A sub-assembly according to claim 14 further comprising a light-transmissive electrically-conductive layer disposed on the surface of the layer of electro-optic medium remote from the adhesive layer.