Electrochromic device
AssigneeCorning Incorporated
InventorsBernard A. G. Eid, Jean-Pierre Themont
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Abstract
This invention relates to an electrochromic device comprising a layer (2') of an electrochromic product held between two conducting layers (5',6') each formed on one face of a transparent plate (3',4'), electrodes formed on each of the conducting layers, and a source of direct current for selectively supplying these electrodes with electrical energy. Electrodes (8', 9', 10, 11) are of elongated shape and extend over facing surfaces of the two conducting layers (5',6'), essentially symmetrical with respect to the plane of the electrochromic layer (2'). The invention has application to windows in the building industry or the automobile industry (windshields, windows, rear view mirrors, etc.)
Claims6
An electrochromic device comprising an electrochromic layer (2') held between two conducting layers (5',6') and being bounded by at least two essentially straight edges, at least four electrodes (8',9',10,11) of elongated shape extending over facing surfaces of said two conducting layers (5',6') with means for selectively supplying these electrodes with electrical energy, said electrodes being disposed facing two-by-two in parallel in the vicinity of each of the straight edges and being essentially symmetrical with respect to the plane of said electrochromic layer (2'), the distance between said edges of said electrochromic layer (2') being such that l<0.5l.sub.c and, preferably l<0.3l.sub.c where (l.sub.c) is a critical width defined by the equation ##EQU2## where Z is the real impedance of electrochromic layer (2');
- S is the surface of electrochromic layer (2');
- and
- R.sub.S is the resistance of the surface of conducting layers (5'6') in ohms/square.
Dependencies are inferred from the claim text.