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Low-velocity electron excited fluorescent display device

  • US 4,208,613 A
  • Filed: 03/23/1978
  • Issued: 06/17/1980
  • Est. Priority Date: 06/30/1975
  • Status: Expired due to Term
First Claim
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1. A low-velocity electron excited fluorescent display device comprising an anodic plate having a fluorescent screen on one side thereof, a cathode standing face to face with said fluorescent screen and a sealed evacuated tube in which said anodic plate and said cathode are enclosed wherein said fluorescent screen is comprised of a fluorescent composition comprising a mechanical mixture of indium oxide (In2 O3) and a silver activated zinc sulfide phosphor (ZnS:

  • Ag) said indium oxide and said phosphor being present in a weight ratio of 1;

    9 to 9;

    1, the amount of silver contained in said phosphor being from 10-5 to 10-3 gram per one gram of zinc sulfide.

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