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Electrochromic device

  • US 5,353,148 A
  • Filed: 08/21/1992
  • Issued: 10/04/1994
  • Est. Priority Date: 09/16/1991
  • Status: Expired due to Fees
First Claim
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1. 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<

  • 0.5lc and, preferably l<

    0.3lc where (lc) 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

    RS is the resistance of the surface of conducting layers (5'"'"'6'"'"') in ohms/square.

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