Patent ID: 7460289
Filing Date: 2008-12-02
Classification: G02F

Abstract:
1. An electrochromic device comprising a single supporting substrate on which are disposed: (a) a working electrode comprising a porous layer of an electrically conducting or semiconducting material, the working electrode comprising material which is electrochromic per se and/or at least a portion of said working electrode bearing electrochromic material; (b) a counter electrode comprising a porous layer of an electrically conducting or semiconducting material, wherein said counter electrode does not have physical contact with said working electrode; (c) a layer of an electrically insulating material which is ion-permeable and which separates the working electrode and the counter electrode layers; and (d) an ion porous electrical current supporting layer interposed between the working electrode and the electrically insulating layers; wherein said electrochromic material has a major surface at least a portion of which forms at least a portion of an external surface of the device.