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Air ion and charge detector

  • US 4,286,210 A
  • Filed: 08/16/1979
  • Issued: 08/25/1981
  • Est. Priority Date: 08/16/1979
  • Status: Expired due to Term
First Claim
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1. An air ion and electric field detector comprisingtwo electroconductive surfaces insulated from each other,a liquid crystal display having a large-area reference electrode and two small-area indicating electrodes, one in the shape of a plus sign and one in the shape of a minus sign, the reference electrode connected to one of the conductive surfaces, the two indicating electrodes connected to the other surface through two diodes, one oriented to pass the current to the plus sign, the other from the minus sign to the conductive surface.

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