Claims
- 1. An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response times less than 50 milliseconds comprising:
- transparent electronically conductive display electrode means;
- counterelectrode means for establishing a potential difference relative to said display electrode means;
- a layer of electrochromic material comprising a rare earth diphthalocyanine complex disposed on said display electrode means; and
- an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current;
- wherein said electrolyte material is a concentrated aqueous solution of metal salt which solution freezes at a temperature below approximately -50 C.
- 2. The display cell recited in claim 1, wherein: said rare earth diphthalocyanine complex is selected from the group consisting of rare earth elements in the lanthanide series, yttrium, and scandium.
- 3. The display cell recited in claim 1, wherein: said electrolyte material comprises an aqueous calcium chloride solution.
- 4. The display cell recited in claim 3 wherein: said calcium chloride represent about 30% by weight of said solution.
- 5. The display cell recited in claim 1 wherein: said electrolyte material comprises an aqueous lithium chloride solution.
- 6. The display cell recited in claim 5, wherein: said lithium chloride represents about 25% by weight of said solution.
- 7. An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response time of less than 50 milliseconds comprising:
- transparent electronically conductive display electrode means;
- counterelectrode means for establishing a potential difference relative to said display electrode means;
- a layer of electrochromic material comprising a rare-earth diphthalocyanine complex disposed on said display electrode means; and
- an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current;
- wherein said electrolyte material is a concentrated aqueous solution of calcium chloride which solution freezes at a temperature below -15.degree. C.
- 8. The display cell recited in claim 7 wherein:
- said calcium chloride represents about 30% by weight of said solution.
- 9. An electrochromic display cell capable of assuming a plurality of visually distinct optical states at very low temperatures with response time of less than 50 milliseconds comprising:
- transparent electronically conductive display electrode means;
- counterelectrode means for establishing a potential difference relative to said display electrode means;
- a layer of electrochromic material comprising a rare-earth diphthalocyanine complex disposed on said display electrode means; and
- an electrolyte material interposed between said film on said display electrode means and said counterelectrode means in order to pass ionic current;
- wherein said electrolyte material is a concentrated aqueous solution of lithium chloride which solution freezes at a temperature below -15.degree. C.
- 10. The display cell recited in claim 9 wherein:
- said lithium chloride represents about 25% by weight of said solution.
Parent Case Info
This application is a continuation-in-part of the U.S. patent application Ser. No. 36,967, filed May 8, 1979, now abandoned, which in turn was a continuation-in-part of the U.S. patent application Ser. No. 948,364, filed Oct. 4, 1978, now U.S. Pat. No. 4,184,751, which in turn was a continuation of U.S. patent application Ser. No. 752,950, filed Dec. 20, 1976, and now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2024269 |
Dec 1971 |
DEX |
2756551 |
Jun 1978 |
DEX |
Non-Patent Literature Citations (2)
Entry |
C. A., vol. 77, pp. 397-398, 107325(b) 1972; Citing Moskalev, P. N. et al., Zh. Fiz. Khim, vol. 46(7), pp. 1778-1781 (1972). |
C. A., vol. 74, p. 337, 17653(r) 1970; Citing Moskalev, P. N. et al., Opt. Spektrosk., vol. 29(2), pp. 414-415 (1970). |
Continuations (1)
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Number |
Date |
Country |
Parent |
752950 |
Dec 1976 |
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Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
36967 |
May 1979 |
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Parent |
948364 |
Oct 1978 |
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