Electrochromic display device
US4401984A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1980 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Oct 10, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/163
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrochromic display device has an electrolyte contained between two spaced-apart substrates. A set of display elements including first and second display elements are disposed on the surface of at least one of the substrates in contact with the electrolyte, and a counter electrode is disposed on the surface of the other substrate in contact with the electrolyte. Each of the display elements comprises a transparent electrode and an electrochromic layer disposed on the transparent electrode such that the display element exhibits either colored or bleached states depending on the amount of electric charge held by the display element. A charge transfer voltage is selectively applied between preselected bleached and colored display elements to effect transfer of electric charges through the electrolyte to thereby change the display state. Deterioration of the coloration exhibited by the colored display elements is compensated by applying a constant voltage between the first display element and the counter electrode, the value of the constant voltage being lower than that of the charge transfer voltage, and control circuitry controls the application of the constant voltage such tha…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.