Electrochromic display device
US4253741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1976 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Aug 26, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/161
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Electrochromic display device employed in a liquid EC system in which an electrode and electrochromic material applied thereon are segmented to define segments corresponding to elements of a displaying pattern and electrode segment portions in excess of the area required to define the displaying pattern are coated with an insulator material, excess area portions of electrochromic material also being similarly coated if necessary, whereby there is reduced build-up of reverse EMF upon activation of the cell and longer color persistence is achieved without use of a complicated drive circuit. To simplify device manufacture for mass-production purposes electrochromic material may be applied in a single layer on an electrode and the display pattern is defined by insulator material applied on selected areas of the electrochromic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.