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Solid electrochromic element

  • US 4,293,194 A
  • Filed: 12/20/1979
  • Issued: 10/06/1981
  • Est. Priority Date: 12/27/1978
  • Status: Expired due to Term
First Claim
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1. A solid electrochromic element which comprises a dielectric material layer, an electron blocking layer, a solid electrochromic substance layer and a second electrode successively laminated on a first electrode and in which a voltage is applied between said first and said second electrode to thereby cause coloration of said solid electrochromic substance layer, the improvement residing in that said electron blocking layer is formed by at least two layers, of which the layer adjacent to the electrode to which a positive voltage is applied is formed by an N-type semiconductor and the layer adjacent to the electrode to which a negative voltage is applied is formed by a P-type semiconductor.

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