Components and methods for use in electro-optic displays

• US 7,839,564 B2
• Filed: 10/17/2006
• Issued: 11/23/2010
• Est. Priority Date: 09/03/2002
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: E Ink Holdings Incorporated
• Inventors: Walls, Michael D., Ritter, John E., Steiner, Michael L., Danner, Guy M., Paolini, Richard J. Jr., Duthaler, Gregg M., Sohn, Seungman, Honeyman, Charles Howie, McCreary, Michael D., Whitesides, Thomas H.
• Primary Examiner(s): Mack; Ricky L
• Assistant Examiner(s): Thomas; Brandi N
• Application Number:
  US11/550,114
• Publication Number:
  US 20070109219A1
• Time in Patent Office: 1,498 Days
• Field of Search: 359/296, 359/315, 359/316, 359/321, 359/322, 359/245, 359/242, 359/252, 359/253
• US Class Current: 359/315
• CPC Class Codes: G02F 1/133354 Arrangements for aligning or assembling substrates
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/153 Constructional details
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/16757 Microcapsules
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: G02F 2203/60 Temperature independent

Abstract

An electro-optic display comprises, in order, a backplane comprising a plurality of pixel electrodes; a layer of a solid electro-optic medium; a main adhesive layer; and at least one of a light-transmissive protective layer and a light-transmissive electrically-conductive layer. The electro-optic layer may be in direct contact with the backplane or separated therefrom by a thin auxiliary layer of adhesive. The main adhesive layer may be colored to provide a color filter array. An inverted front plane laminate useful in forming such a display comprises the same layers except that the backplane is replaced by a release sheet. The display combines good low temperature performance and good resolution at higher temperatures.

Claims

1. An article of manufacture comprising, in this order:

a release sheet;

a layer of a solid electro-optic medium;

an adhesive layer; and

at least one of a light-transmissive protective layer and a light-transmissive electrically-conductive layer,

the article of manufacture further comprising an auxiliary adhesive layer interposed between the release sheet and the electro-optic layer, the auxiliary adhesive layer having a thickness not greater than about 10 μ

m.

2. An article of manufacture according to claim 1 wherein the adhesive layer comprises a least two sections having differing colors.

3. An article of manufacture according to claim 2 wherein the adhesive layer has sections having at least three different colors.

4. An article of manufacture according to claim 3 wherein the adhesive layer has yellow, cyan and magenta, or red, green and blue, or red, green, blue and clear sections.

5. An article of manufacture according to claim 2 wherein the adhesive layer is colored using at least one pigment.

6. An article of manufacture according to claim 5 wherein the pigment has an average particle size in the range of about 5 to about 50 nm.

7. An article of manufacture according to claim 1 wherein the adhesive layer comprises at least one of an ultra-violet absorber and a light-scattering or light-diffusing material.

8. An article of manufacture according to claim 1 comprising both a light-transmissive protective layer and a light-transmissive electrically-conductive layer, the electrically-conductive layer being disposed between the protective layer and the adhesive layer.

9. An article of manufacture according to claim 1 wherein the electro-optic medium comprises an electrochromic or rotating bichromal member medium.

10. An article of manufacture according to claim 1 wherein the electro-optic medium comprises an electrophoretic medium having a plurality of electrically charged particles disposed in a fluid and capable of moving through the fluid on application of an electric field to the electro-optic medium.

11. An article of manufacture according to claim 10 wherein the electrically charged particles and the fluid are encapsulated within a plurality of capsules or cells.

12. An article of manufacture according to claim 10 wherein the electrically charged particles and the fluid are present as a plurality of discrete droplets held within a polymeric continuous phase.

13. An article of manufacture according to claim 10 in which the fluid is gaseous.

14. An article of manufacture comprising, in this order:

a release sheet;

a layer of a solid electro-optic medium;

an adhesive layer; and

at least one of a light-transmissive protective layer and a light-transmissive electrically-conductive layer,

the article of manufacture further comprising an auxiliary adhesive layer interposed between the release sheet and the electro-optic layer, the auxiliary adhesive layer having a thickness not greater than about one half of the thickness of the adhesive layer on the opposed side of the electro-optic layer.

15. An article of manufacture according to claim 14 wherein the adhesive layer comprises a least two sections having differing colors.

16. An article of manufacture according to claim 15 wherein the adhesive layer has sections having at least three different colors.

17. An article of manufacture according to claim 16 wherein the adhesive layer has yellow, cyan and magenta, or red, green and blue, or red, green, blue and clear sections.

18. An article of manufacture according to claim 15 wherein the adhesive layer is colored using at least one pigment.

19. An article of manufacture according to claim 18 wherein the pigment has an average particle size in the range of about 5 to about 50 nm.

20. An article of manufacture according to claim 14 wherein the adhesive layer comprises at least one of an ultra-violet absorber and a light-scattering or light-diffusing material.

21. An article of manufacture according to claim 14 comprising both a light-transmissive protective layer and a light-transmissive electrically-conductive layer, the electrically-conductive layer being disposed between the protective layer and the adhesive layer.

22. An article of manufacture according to claim 14 wherein the electro-optic medium comprises an electrochromic or rotating bichromal member medium.

23. An article of manufacture according to claim 14 wherein the electro-optic medium comprises an electrophoretic medium having a plurality of electrically charged particles disposed in a fluid and capable of moving through the fluid on application of an electric field to the electro-optic medium.

24. An article of manufacture according to claim 23 wherein the electrically charged particles and the fluid are encapsulated within a plurality of capsules or cells.

25. An article of manufacture according to claim 23 wherein the electrically charged particles and the fluid are present as a plurality of discrete droplets held within a polymeric continuous phase.

26. An article of manufacture according to claim 23 in which the fluid is gaseous.