Counter electrode arrangement of an electrochromic display device
First Claim
1. An electrochromic display device having at least one display electrode comprisingan electrolyte associated with the display electrode,a counter electrode in contact with said electrolyte that is maintained charged to a given potential during operation,a donor electrode for transferring a charge to said counter electrode during operation,a reference electrode for sensing the potential of said counter electrode during operation, andelectric circuit means responsive to the potential sensed by said reference electrode to cause said donor electrode to transfer charge to said counter electrode so as to maintain said counter electrode at the given potential.
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Abstract
An electrochromic display device comprises a single counter electrode and a plurality of display electrodes. The counter electrode is charged and is maintained at a given potential by a donor electrode which transfers charge to the counter electrode in response to the action of a reference electrode. A potentiostat operates to supply current to the donor electrode in accordance with the potential of the counter electrode as sensed by the reference electrode. Both the donor electrode and the counter electrode are preferably of platinum black. The donor electrode is preferably arranged in the manner of a frame about the display area. The counter electrode is preferably grid-shaped.
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Citations
7 Claims
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1. An electrochromic display device having at least one display electrode comprising
an electrolyte associated with the display electrode, a counter electrode in contact with said electrolyte that is maintained charged to a given potential during operation, a donor electrode for transferring a charge to said counter electrode during operation, a reference electrode for sensing the potential of said counter electrode during operation, and electric circuit means responsive to the potential sensed by said reference electrode to cause said donor electrode to transfer charge to said counter electrode so as to maintain said counter electrode at the given potential.
Specification