Electrochromic element

Details Electrochromic element Electrochromic element

1996-12-11

1998-12-08

Font, Frank G.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359267, 359262, 359271, 359273, G02B 1700

Patent

active

058478582

ABSTRACT:
The electrochromic element comprises an electrochromic layer (22) whose transmission properties change when a voltage difference is applied across the element. Said electrochromic layer (22) comprises a first metal oxide of the group formed by WO.sub.3, MoO.sub.3, Nb.sub.2 O.sub.5, MnO.sub.2 and ZrO.sub.2 (and combinations thereof) and a second metal oxide containing V.sub.2 O.sub.5, TiO.sub.2 and/or ZnO. If the concentration of the second metal in the mixture ranges from 1 to 15 at. %, preferably from 3 to 10 at. %, the electrochromic layer (22) is transparent and colorless if no guest atoms are incorporated in the layer, and it is (color neutral) grey if a substantial concentration of guest atoms is incorporated in the layer.
Electrochromic elements are provided, for example, on the outer surface of a display screen of a display device.

REFERENCES:
patent: 4231641 (1980-11-01), Randin
patent: 4652090 (1987-03-01), Uchikawa
patent: 4824222 (1989-04-01), Green

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