Electrochromic display device

• US 5,995,273 A
• Filed: 02/25/1998
• Issued: 11/30/1999
• Est. Priority Date: 02/25/1998
• Status: Expired due to Term

• Current Assignee: Ashwin-Ushas Corporation
• Original Assignee: Ashwin-Ushas Corporation
• Inventors: Chandrasekhar, Prasanna
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): BURKE, MARGARET A
• Application Number:
  US09/030,170
• Time in Patent Office: 643 Days
• Field of Search: 359/265, 359/267, 359/269, 359/270, 359/273, 252/62.2, 252/583, 252/582, 252/586
• US Class Current: 359/270
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials
• CPC Class Codes: G02F 1/15165 Polymers
• CPC Class Codes: G02F 1/153 Constructional details
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 2202/022 polymeric

Abstract

An electrochromic device is provided having an electrochromic conducting polymer layer in contact with a flexible outer layer. A conductive reflective layer is disposed between the electrochromic conducting polymer and a substrate layer. A liquid or solid electrolyte contacts the conductive reflective layer and a counter electrode in the device. A liquid electrolyte may comprise, for example, a mixture of sulfuric acid, poly(vinyl sulfate), and poly(anethosulfonate). A solid electrolyte may comprise, for example, a mixture of sulfuric acid, poly(vinyl sulfate), poly(anethosulfonate), and poly(vinyl alcohol). The electrochromic conducting polymer layer may comprise, for example, poly(diphenyl amine), poly(4-amino biphenyl), poly(aniline), poly(3-alkyl thiophene), poly(phenylene), poly(phenylene vinylene), poly(alkylene vinylenes), poly(amino quinolines), or poly(diphenyl benzidine) and one or more dopants such as poly(styrene sulfonate), poly(anethosulfonate), poly(vinyl sulfate), p-toluene sulfonate, trifluoromethane sulfonate, and poly(vinyl stearate).

Claims

1. A flexible electrochromic device comprising

(a) a flexible outer layer;

(b) an electrode comprising;

(i) an electrochromic conducting polymer layer in contact with the flexible outer layer;

(ii) an electrolyte-permeable substrate layer;

(iii) a conductive reflective layer disposed between the substrate layer and the electrochromic conducting polymer layer;

(c) one or more counter electrodes; and

(d) an electrolyte in contact with said conductive reflective layer and said one or more counter electrodes.

2. An electrochromic device according to claim 1, wherein the conductive reflective layer is in the form of a grid.

3. An electrochromic device according to claim 1, wherein one or more counter electrodes comprise

(a) a second conducting polymer layer;

and

(b) a second substrate layer in contact with said second conducting polymer layer.

4. An electrochromic device according to claim 1, wherein said electrochromic conducting polymer layer further comprises one or more dopants.

5. An electrochromic device according to claim 1, wherein the electrochromic conducting polymer of said electrochromic conducting polymer layer is selected from the group consisting of poly(aniline), poly(diphenyl amine), poly(4-amino biphenyl), poly(3-alkyl thiophene), poly(phenylene), poly(phenylene vinylene), poly(alkylene vinylenes), poly(amino quinolines), poly(diphenyl benzidine), and combinations thereof.

6. An electrochromic device according to claim 4, wherein said dopant is selected from the group consisting of poly(styrene sulfonate), poly(anethosulfonate), poly(vinyl sulfate), p-toluene sulfonate, trifluoromethane sulfonate, 3-hydroxy-42,7-naphthalenesulfonic acid, poly(vinyl stearate), and combinations thereof.

7. An electrochromic device according to claim 6, wherein the electrochromic conducting polymer of said electrochromic conducting polymer layer is poly(aniline) and said dopant is selected from the group consisting of poly(vinyl sulfate), poly(anethosulfonate), and combination thereof.

8. An electrochromic device according to claim 7, wherein said dopant is poly(vinyl sulfate).

9. An electrochromic device according to claim 1, wherein said outer layer comprises one or more polymer selected from the group consisting of poly(ethylene terephthalate), poly(ethylene), poly(propylene), poly(methyl methacrylate), poly(ethyl methacrylate), acrylonitrile methyl acrylate copolymers, ethylene vinyl acetate, fluorinated ethylenepropylene resins, fluorinated poly(alkylenes), poly(vinyl alcohol), poly(ethylene glycol), poly(vinyl chloride).

10. An electrochromic device according to claim 9, wherein said outer layer comprises poly(ethylene).

11. An electrochromic device according to claim 9, wherein said outer layer comprises poly(methyl methacrylate), poly(ethyl methacrylate) or mixture thereof.

12. An electrochromic device according to claim 1, wherein said electrolyte-permeable substrate layer contains pores having a pore size less than about 50 μ

m.

13. An electrochromic device according to claim 12, wherein said electrolyte-permeable substrate layer contains pores having a pore size from about 0.05 μ

m to about 20 μ

m.

14. The electrochromic device according to claim 1, wherein the electrolyte-permeable substrate layer comprises a material selected from the group consisting of poly(propylene), poly(ethylene terephthalate), poly(tetrafluoroethylene), poly(ethylene), nylon, poly(vinylidene fluoride), and combinations thereof.

15. The electrochromic device according to claim 1, wherein the conductive reflective layer is formed from a metal selected from the group consisting of Ir, Pt, Au, Rh, Cu, Ag, and Ni and combinations thereof.

16. An electrochromic polymeric matrix comprising:

(a) one or more conducting polymers selected from the group consisting of poly(diphenyl amine), poly(4-amino biphenyl), poly(aniline), poly(3-alkyl thiophene), and poly(diphenyl benzidine); and

(b) poly(anethosulfonate) as a dopant polymer.

17. An electrochromic polymeric matrix according to claim 16 wherein the conducting polymer is poly(aniline), and the composition comprises poly(vinyl sulfate) as a further dopant polymer.

18. An electrochromic device comprising

(a) an electrode comprising an electrochromic material;

(b) one or more counter electrodes; and

(c) an aqueous electrolyte in contact with the electrochromic material and the one or more counter electrodes, which electrolyte comprises sulfuric acid, poly(vinyl sulfate) and poly(anethosulfonate).

19. An electrochromic device according to claim 18 wherein the electrolyte further comprises poly(vinyl alcohol).

20. An electrochromic device comprising

(a) an electrode comprising an electrochromic material;

(b) one or more counter electrodes; and

(c) a nonaqueous electrolyte in contact with the electrochromic material and the one or more counter electrodes, which electrolyte comprises;

(i) poly(ethylene oxide);

(ii) poly(ethylene glycol);

(iii) poly(anethosulfonate);

(iv) poly(vinyl sulfate); and

(v) one or more dopants selected from the group consisting of poly(anethosulfonate), p-toluene sulfonate, trifluoromethane sulfonate, poly(vinyl stearate), and poly(vinyl sulfate).

21. An electrochromic polymeric matrix comprising:

(a) one or more conducting polymers selected from the group consisting of poly(diphenyl amine), poly(4-amino biphenyl), poly(3-alkyl thiophene), and poly(diphenyl benzidine); and

(b) one or more dopant polymer selected from the group consisting of poly(anethosulfonate) and poly(vinylsulfate).