Electrochromic display device
First Claim
1. 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 consisting essentially of an electrochromic compound which is colored in and present in its reduced state and a solvent selected from the group consisting of (a) water and (b) water and alcohol, the solubility of said electrochromic compound to said solvent being 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, said electrochromic composition being sealed between said pair of electrode plates in said reduced state.
0 Assignments
0 Petitions
Accused Products
Abstract
An electrochromic display device composed of a pair of oppositely disposed electrode plates at one of which is transparent, and an electrochromic composition sealed between the pair of electrode plates. The electrochromic composition is composed of an electrochromic compound coloring in a reduced state and a solvent. The electrochromic compound coloring in a reduced state is sealed between the electrode plated in a reducing atmosphere. The solubility of the electrochromic compound to the solvent is 10-2 mol/(100 g solvent) or more in a reduced state and 10-1 mol/(100 g solvent) or more in an oxidized state. The solvent is preferably composed of water and at least 70% by weight of alcohol. The alcohol is desirably polyhydric alcohol.
28 Citations
24 Claims
- 1. 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 consisting essentially of an electrochromic compound which is colored in and present in its reduced state and a solvent selected from the group consisting of (a) water and (b) water and alcohol, the solubility of said electrochromic compound to said solvent being 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, said electrochromic composition being sealed between said pair of electrode plates in said reduced state.
-
22. 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 being composed of an electrochromic compound which is colored in a reduced state and a solvent selected from the group consisting of (a) water and (b) water and alcohol where the alcohol is not less than 70% by weight of the total amount of the solvent, the solubility of said electrochromic compound to said solvent being 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, said electrochromic composition being sealed between said pair of electrode plates in said reduced state, 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