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Faster addressing of electrochromic displays

  • US 4,099,839 A
  • Filed: 09/23/1976
  • Issued: 07/11/1978
  • Est. Priority Date: 07/18/1975
  • Status: Expired due to Term
First Claim
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1. In an electro-optical display device which contains a plurality of elements, each of said elements comprising a light transmitting substrate with a persistent electrochromic material as a light modulating material, a counter-electrode, and an ion conductive material in contact with said electrochromic material and said counter-electrode, an improved method to sequentially address each element comprising:

  • 1. providing means for a pulse of direct current, and2. one capacitor per element with said capacitor being in parallel connection with said element and the counter-electrode to transfer said pulse to the element for a fixed limited time interval, wherein the transfer interval is sufficiently long so as to accomplish writing or erasing of said element and the transfer interval occurs independently of the addressing.

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