Method and system for lowering the drive potential of an electrochromic device

• US 20070188841A1
• Filed: 02/10/2006
• Published: 08/16/2007
• Est. Priority Date: 02/10/2006
• Status: Abandoned Application

• Current Assignee: Ntera Incorporated (Ntera Holdings Incorporated)
• Original Assignee: Ntera Incorporated (Ntera Holdings Incorporated)
• Inventors: Moeller, Martin, Corr, David, Vlachopoulos, Nikolaos, Mulroy, David
• Application Number:
  US11/351,579
• Publication Number:
  US 20070188841A1
• Time in Patent Office: Days
• US Class Current: 359/265
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
• CPC Class Codes: G02F 1/163 Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor

Abstract

An electrochromic (EC) device having a low starting potential, thereby having a lower drive potential is disclosed. A potential is applied to the EC device to lower the starting potential. Methods and systems for manufacturing EC devices and adjusting the drive potential of an existing EC device are also disclosed.

Claims

1. A method for lowering the drive potential of an electrochromic device comprising a first electrode, a second electrode, and an electrolyte, the method comprising applying a potential between the first and second electrodes.

2. The method of claim 1, wherein the potential applied between the first and second electrodes is between approximately +/−

0.1 and approximately +/−

10 V.

3. The method of claim 2, wherein the potential applied between the first and second electrodes is between approximately +/−

1.5 and approximately +/−

3 V.

4. The method of claim 1, wherein the drive potential of the electrochromic device is lowered by a magnitude of at least approximately 10 mV.

5. The method of claim 4, wherein the drive potential of the electrochromic device is lowered by a magnitude of at least at least approximately 2 V.

6. The method of claim 1, wherein the first electrode comprises an electrochromic material;

the second electrode comprises a bipolarisable material; and

the potential applied between the first and second electrodes is between approximately +0.5 V and approximately +5 V.

7. A method of manufacturing an electrochromic device having a low drive potential, the method comprising:

(a) assembling a first electrode, a second electrode, and an electrolyte to form an electrochromic device; and

(b) applying a potential between the first and second electrodes to lower the drive potential of the electrochromic device.

8. The method of claim 7, wherein the potential applied between the first and second electrodes is between approximately +/−

0.1 and approximately +/−

10 V.

9. The method of claim 8, wherein the potential applied between the first and second electrodes is between approximately +/−

1.5 and approximately +/−

3 V.

10. The method of claim 7, wherein the drive potential of the electrochromic device is lowered by a magnitude of at least approximately 10 mV.

11. The method of claim 10, wherein the drive potential of the electrochromic device is lowered by a magnitude of at least approximately 2 V.

12. The method of claim 7, wherein the first electrode comprises an electrochromic material;

the second electrode comprises a bipolarisable material; and

the potential applied between the first and second electrodes is between approximately +0.5 V and approximately +5 V.

13. A method of manufacturing an electrochromic device, the method comprising:

(a) assembling a first electrode, a second electrode, and an electrolyte to form an electrochromic device; and

(b) incorporating computer software for applying a potential between the first and second electrodes to lower the drive potential of the electrochromic device.

14. The method of claim 13, wherein the potential applied between the first and second electrodes is between approximately +/−

0.1 and approximately +/−

10 V.

15. The method of claim 14, wherein the potential applied between the first and second electrodes is between approximately +/−

1.5 and approximately +/−

3 V.

16. The method of claim 13, wherein the drive potential of the electrochromic device is lowered by a magnitude of at least approximately 10 mV.

17. The method of claim 16, wherein the drive potential of the electrochromic device is lowered by a magnitude of at least approximately 2 V.

18. The method of claim 13, wherein the first electrode comprises an electrochromic material;

the second electrode comprises a bipolarisable material; and

the potential applied between the first and second electrodes is between approximately +0.5 V and approximately +5 V.

19. An electrochromic device having a low drive potential comprising a first electrode, a second electrode, an electrolyte, and means for applying a potential between the first and second electrodes.

20. The electrochromic device of claim 19, wherein the means for applying a potential between the first and second electrodes comprises computer software.

21. The electrochromic device of claim 19, wherein the potential applied between the first and second electrodes is between approximately +/−

0.1 and approximately +/−

10 V.

22. The electrochromic device of claim 21, wherein the potential applied between the first and second electrodes is between approximately +/−

1.5 and approximately +/−

3 V.

23. The electrochromic device of claim 19, wherein the drive potential is lowered by a magnitude of at least approximately 10 mV.

24. The electrochromic device of claim 23, wherein the drive potential is lowered by a magnitude of at least approximately 2 V.

25. The electrochromic device of claim 19, wherein the first electrode comprises an electrochromic material;

the second electrode comprises a bipolarisable material; and

the potential applied between the first and second electrodes is between approximately +0.5 V and approximately +5 V.

26. A method for lowering the overvoltage needed to operate an electrochromic device comprising a first electrode, a second electrode, and an electrolyte, the method comprising applying a potential greater than zero between the first and second electrodes.

27. The method of claim 26, wherein the magnitude of the potential applied between the first and second electrodes is greater than the magnitude of the normal drive potential used in the electrochromic device.

28. The method of claim 26, wherein the potential applied between the first and second electrodes is a varying waveform.

29. An electrochromic device having an adjustable starting potential comprising a first electrode, a second electrode, an electrolyte, and an electrical device for applying an electrical potential between the first and second electrodes.

30. The electrochromic device of claim 29 further comprising a detector.

31. The electrochromic device of claim 29 further comprising a tester.

32. The electrochromic device of claim 29 further comprising an internal logic unit.

33. A method of manufacturing an electrochromic device having a high contrast ratio at a low drive potential comprising a first electrode, a second electrode, and an electrolyte, the method comprising applying a potential greater than zero between the first and second electrodes.

34. A method of operating an optical device comprising:

(a) applying a potential to the optical device for a period of time sufficient to reduce an operating potential;

(b) measuring the contrast of the optical device to determine thereby if the operating potential has been sufficiently reduced; and

(c) reapplying the potential to the optical device if the operating potential has not been sufficiently reduced.

35. A method for changing the drive potential of an electrochromic device comprising a first electrode, a second electrode, and an electrolyte, the method comprising applying a potential between the first and second electrodes.

36. The method of claim 35 wherein said changing comprises increasing the drive potential.

37. The method of claim 35 wherein said applying a potential is performed for a period of time ranging between +/−

3 milliseconds and 5 minutes.

38. A method for changing the drive potential of an electrochromic device comprising a first electrode, a second electrode, and an electrolyte;

the method comprising temporarily subjecting at least part of the electrochromic device to one or more field forces, said field forces selected from the group consisting of a plasma, an electric field, a magnetic field, and combinations thereof.