Electrochromic device
US4775227A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1986 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | Jun 3, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1516
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrochromic device consists of the layers: tin-oxide-coated glass; rare earth diphthalocyanine (REDPC); membrane electrolyte; REDPC; tin-oxide-coated glass. The REDPC is the electrochromic layer and contains a mixture of rare earths as obtained from a natural deposit without being individually separated. The REDPC is preheated to purify it and then sublimed into position as the device is assembled. The device is driven by a controller which is limited to the voltage range +2V to -1V, whereby only the colors red, green and blue are obtainable, that is, although the REDPC at -1.5V would show purple, this is deliberately foregone to prolong its life. The REDPC may be further mixed with tin phthalocyanine chloride or ruthenium, iron, zinc or cobalt phthalocyanine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.