1986-06-03
1988-10-04
Laroche, Eugene R.
G02F 101
Patent
active
047752270
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.
REFERENCES:
patent: 4184751 (1980-01-01), Nicholson
patent: 4306774 (1981-12-01), Nicholson
patent: 4432612 (1984-02-01), Nicholson et al.
patent: 4474433 (1984-10-01), Nicholson et al.
patent: 4571029 (1986-02-01), Skotheim et al.
LaRoche Eugene R.
McCutcheon Nathan W.
National Research Development Corporation
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