Electrochromic display device
US4521081A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1982 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Mar 25, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1524
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for forming an electrochromic film to be used in an electrochromic device is provided. The process includes a step of introducing a mixture of oxygen gas and inert gas at a predetermined mixing ratio into a reactor in which is provided an electrode having thereon a sheet of tungsten as a target and a counter-electrode holding thereon a substrate under a predetermined total pressure condition and a step of applying a predetermined voltage between said electrodes while maintaining the substrate at a predetermined temperature. The present process allows to provide a WO.sub.3 -sputtered film on the substrate. The present invention also provides an electrochromic display device in which the electrochromic film is operated under control not to reach the color saturation condition, thereby preventing the occurrence of separation of the film and thus ensuring a long-term servicelife.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.