Electrochromic variable color tone nonglaring mirror

Details Electrochromic variable color tone nonglaring mirror Electrochromic variable color tone nonglaring mirror

1987-08-10

1989-05-23

LaRoche, Eugene R.

G02F 117

Patent

active

048324671

ABSTRACT:
The invention relates to a nonglaring mirror which is an electrochromic (EC) device in principle. The mirror comprises a transparent front substrate provided with a transparent first electrode layer, a back substrate provided with a second electrode layer opposite to the first electrode layer, first and second EC layers formed on the first and second electrode layers, respectively, an electrolyte liquid which fills up the space between the two substrates and reflecting means for providing a reflective surface to the second substrate. The material of the first EC layer is an organic polymer which is colorless or very pale in color in its electrochemically reduced state and undergoes electrochemical oxidation in two stages to assume a characteristic color in the first-stage oxidized state and another color in the second-stage oxidized state, and intermediate colors in intermediately oxidized states. It is very favorable to use a polymer made up of repeating structural units of N,N,N',N'-tetraphenyl-p-phenylenediamine. The second EC layer is usually formed of a transition metal oxide, e.g. WO.sub.3, which takes on color in its electrochemically reduced state.

REFERENCES:
patent: 3844636 (1974-10-01), Maricle et al.
patent: 3990984 (1976-11-01), Barret et al.
patent: 4205988 (1988-06-01), Ozaki et al.
patent: 4285575 (1981-08-01), Imataki et al.
patent: 4465339 (1984-08-01), Baucke et al.
patent: 4613211 (1986-09-01), Papir et al.

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