Claims
- 1. A driving circuit for driving an electrochromic display cell to conduct coloration operations and bleaching operations thereon, said cell including a counter electrode, segment electrodes, and an electrochromic substance contained therebetween, comprising:
- at least two driving terminal means for receiving driving voltages applied thereto;
- voltage divider means connected to said driving terminal means for developing said driving voltages and for applying said driving voltages to said driving terminal means;
- switching means connected to said segment electrodes of said electrochromic display cell for presenting first and second switched states thereto corresponding, respectively, to said coloration and bleaching operations; and
- control means for controlling the time for conducting said coloration and bleaching operations on said electrochromic display cell by controlling the switching of said switching means between said first and second switched states such that the quantity of electrical charge passing through said cell during said bleaching operation is greater than the quantity of electrical charge passing through said cell during said coloration operation;
- said control means in said bleaching operation maintaining said switching means in said second state for a period of time sufficient to permit the resistance of said electrochromic substance to increase and preclude the passage of said electrical charge through said cell.
- 2. A driving circuit in accordance with claim 1, wherein said driving circuit comprises constant voltage driving circuit means for maintaining the voltage across said display cell constant.
- 3. A driving circuit in accordance with claim 1, wherein said driving circuit comprises constant current driving circuit means for maintaining the voltage across said display cell constant, said electrochromic display cell further including reference electrode means for sensing the charge passing through said display cell.
Priority Claims (1)
Number |
Date |
Country |
Kind |
51/111381 |
Sep 1976 |
JPX |
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Parent Case Info
This is a continuation of copending application Ser. No. 833,653, filed on Sept. 15, 1977, abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3839857 |
Berets et al. |
Oct 1974 |
|
3950936 |
Oguey et al. |
Apr 1976 |
|
Non-Patent Literature Citations (1)
Entry |
Giglia, "Features of an Electrochromic Display Device", American Cyanamid Co., pp. 1-13, May 1976. |
Continuations (1)
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Number |
Date |
Country |
Parent |
833653 |
Sep 1977 |
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