Electrochromic display device exhibiting uniform coloration density
US4401983A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1980 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Jul 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/163
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A driving circuit for an electrochromic display device in which electric charges for coloration in a colored segment group are transferred to a bleached segment group to change the display state by the application of a voltage between the colored segment group and the bleached segment group comprises an electric charge transfer control circuit for producing an electric charge transfer signal only when the display information displayed by the electrochromic display device is being changed, and an electric charge transfer-time control circuit for setting the electric charge transfer-time at a time more than the maximum transfer time required by the electrochromic display device both during low temperature operation and during electric charge transfer using the maximum number of segments for which electric charge transfer can be carried out by the electrochromic display device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.