Electrochromic display device
US4349818A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1980 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Jul 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electrochromic display device comprises; an electrolyte held between two substrates at least one of which is transparent. A display electrode is formed on a surface of one substrate and has an electrochromic substance film formed thereon, the surface being in contact with the electrolyte. A first counter electrode is formed on a counter surface of the other substrate in opposed spaced-apart relationship with respect to the display electrode, and a second counter electrode is formed on a face of either one of the substrates, the face being in contact with the electrolyte. Circuitry applies a first voltage between the display electrode and the first counter electrode to effect coloration of the display electrode, and applies a second voltage between the first and second counter electrodes to establish an electric field therebetween effective to remove a negative ion region which forms in the vicinity of the first counter electrode during coloration of the display electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.