Electrochromic composition and electrochromic display device using same
First Claim
1. An electrochromic composition comprising a solvent, an electrochromic compound which is colored in a reduced state, the solubility to the solvent of which is not less than 10-2 mol/100 g-solvent in said reduced state and not less than 10-1 mol/100 g-solvent in an oxidized state, and an additive compound selected from the group consisting of (a) ammonia, (b) an amine where all substituents thereof are radicals selected from the group of aliphatic radicals, alicyclic radicals and aromatic radicals and (c) an alkali compound selected from the group consisting of hydroxides, carbonates, and phosphates, said electrochromic compound occurring in said reduced state and the solution of the reduced electrochromic compound being basic due to the presence of said additive compound.
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Abstract
An electrochromic composition is composed of a solvent, an electrochromic compound having a high solubility to the solvent, and a compound selected from a group of ammonia, organic amine and alkali. The solubility of the electrochromic compound to the solvent is not less than 10-2 mol/100 g-solvent in a reduced state and not less than 10-1 mol/100 g-solvent in an oxidized state. A masking agent may be added to the EC compound. The EC composition is sealed in an EC display cell.
39 Citations
32 Claims
- 1. An electrochromic composition comprising a solvent, an electrochromic compound which is colored in a reduced state, the solubility to the solvent of which is not less than 10-2 mol/100 g-solvent in said reduced state and not less than 10-1 mol/100 g-solvent in an oxidized state, and an additive compound selected from the group consisting of (a) ammonia, (b) an amine where all substituents thereof are radicals selected from the group of aliphatic radicals, alicyclic radicals and aromatic radicals and (c) an alkali compound selected from the group consisting of hydroxides, carbonates, and phosphates, said electrochromic compound occurring in said reduced state and the solution of the reduced electrochromic compound being basic due to the presence of said additive compound.
- 9. An electrochromic display device comprising an electrochromic display cell and an electrochromic composition filled in said cell, said electrochromic composition comprising a solvent, an electrochromic compound which is colored in a reduced state, the solubility of the solvent of which is not less than 10-2 mol/100 g-solvent in said reduced state and not less than 10-1 mol/100 g-solvent in an oxidized state, and an additive compound selected from the group consisting of (a) ammonia, (b) an amine where all substituents thereof are radicals selected from the group of aliphatic radicals, alicyclic radicals and aromatic radicals and (c) an alkali compound selected from the group consisting of hydroxides, carbonates, and phosphates, said electrochromic compound occurring in said reduced state and the solution of the reduced electrochromic compound being basic due to the presence of said additive compound.
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23. A method of operating an electrochromic display device comprising a pair of oppositely disposed electrode plates each bearing on the inner surface thereof an electrode and an electrochromic composition sealed between said pair of oppositely disposed electrode plates, said electrochromic composition comprising an electrochromic compound which is colored in a reduced state and a solvent, the solubility of said electrochromic compound to said solvent being not less than 10-2 mol/(100g solvent) in said reduced state and not less than 10-1 mol/(100g solvent) in an oxidized state, and an additive selected from the group consisting of (a) ammonia, (b) an amine where all substituents thereof are radicals selected from the group of aliphatic radicals, alicyclic radicals and aromatic radicals, and (c) an alkali compound selected from the group consisting of hydroxides, carbonates, and phosphates, said electrochromic compound occurring in said reduced state and the solution of the reduced electrochromic compound being basic due to the presence of said additive compound, said method comprising the steps of
energizing said device by applying an electrical potential across said plates and extinguishing said device by only removing said potential therefrom.
Specification