Electrochromic display device
First Claim
1. In an electrochromic display device having a container with at least one transparent part for observing the display and containing a first electrode, a second electrode and an electrochemical electrochromic substance contacting said first electrode and said second electrode, the improvement which comprisesa coating of a product of a redox reaction of the color indicating ions of the electrochemical electrochromic substance formed on said second electrode under conditions when said first electrode does not have a coating of said product.
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Abstract
An improved electrochromic display device having a transparent container containing an indication electrode, a counter-electrode and an electrochromic solution contacting the electrodes is disclosed. The improvement is that the counter-electrode is provided with a coating of a reduction product of the color displaying ions or an oxidation product of the color displaying ions of the electrochromic solution. By means of forming the coating of a color displaying product, when a current flows across the indication electrode and counter-electrode, the same redox reaction takes place at both electrodes but the reactions proceed in opposite directions. As a result, the redox reaction can be caused to proceed with a voltage lower than the redox potential of the reaction itself and hence, electrode contamination by additional electrolytic reaction products can be avoided thereby prolonging the life of the device.
18 Citations
14 Claims
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1. In an electrochromic display device having a container with at least one transparent part for observing the display and containing a first electrode, a second electrode and an electrochemical electrochromic substance contacting said first electrode and said second electrode, the improvement which comprises
a coating of a product of a redox reaction of the color indicating ions of the electrochemical electrochromic substance formed on said second electrode under conditions when said first electrode does not have a coating of said product.
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11. In an electrochemical electrochromic display device including a container having at least one transparent portion for display observation and having therein a first electrode, a second electrode and a solution of an electrochemical electrochromic substance containing color displaying ions in contact with both of said electrodes, a color display being caused by impressing a voltage across said electrodes in contact with the electrochemical substance in said container,
the improvement comprising a coating of the reduction product of said color displaying ions or the oxidation product of said color displaying ions of the electrochemical electrochromic substance formed on said second electrode only under conditions when no voltage is impressed across said electrodes, said first electrode being substantially void of said coating.
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14. In an electrochemical electrochromic display device including a container having at least one transparent portion for display observation and having therein a first electrode, a second electrode and a solution of an electrochemical electrochromic substance containing color displaying ions in contact with both of said electrodes, a color display being caused by impressing a voltage across said electrodes in contact with the electrochemical substance in said container,
the improvement comprising a coating of the reduction product of said color displaying ions or the oxidation product of said color displaying ions of the electrochemical electrochromic substance formed on said second electrode only under conditions when no voltage is impressed across said electrodes, said second electrode made of a metal upon which said reduction or oxidation product is deposited by the difference in redox potentials as between said metal and said electrochemical electrochromic substance, said first electrode being substantially void of said coating.
Specification