US 4,053,209 AGranted

Electrochromic device

AssigneeCanon Kabushiki Kaisha

InventorsToshitami Hara, Yoshioki Hajimoto, Yoshiaki Shirato, Masaaki Matsushima

Life of this patent

Estimating the term…

Loading patent…

Abstract

An electrochromic device for use in a display apparatus which is basically constructed with an electrochromic layer containing therein a metal oxide compound, an auxiliary electrochromic layer containing therein at least one kind of metal compound which contains at least one kind of metal element, wherein the difference in electro-negativity between the metal element in the metal compound and the metal element contained in the metal oxide constituting the electrochromic layer is 0.4 or less, both the electrochromic layer and the auxiliary electrochromic layer being laminated, and a pair of electrodes holding between them the laminated electrochromic layer and auxiliary electrochromic layer, at least one of the pair of electrodes being light transmissive.

Claims28

Dependent claims

An electrochromic device comprising a pair of opposed electrodes, at least one of which is light transmissive, having disposed therebetween a laminated electrochromic layer consisting essentially of a metal oxide selected from the group consisting of WO.sub.3, MoO.sub.3 and TiO.sub.2, and a laminated auxiliary electrochromic layer consisting essentially of a compound of a metal;

wherein said metal oxide and said metal compound are selected such that the difference in electronegativity between the metal of said metal oxide and a metal of said metal compound is not greater than 0.4;
and wherein said metal compound is selected from the group consisting of ZrO.sub.2, Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5, V.sub.2 O.sub.5, TiO.sub.2, BaTiO.sub.3, CaTiO.sub.3, SrTiO.sub.3, Y.sub.2 O.sub.3 -containing ZrO.sub.2, AgI, Ag.sub.2 S, AgSI, Ag.sub.3 SBr, Ag.sub.6 I.sub.4 WO.sub.4, and mixtures thereof.

Dependencies are inferred from the claim text.