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Method for remotely detecting an electric field using a liquid crystal device

  • US 4,818,072 A
  • Filed: 03/18/1988
  • Issued: 04/04/1989
  • Est. Priority Date: 07/22/1986
  • Status: Expired due to Term
First Claim
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1. A method of detecting an electric field generated by an electrical component, comprising the steps of:

  • (I) providing a device having at least one liquid crystal display element, said display element comprising;

    (a) a first conductor, at least part of which is transparent;

    (b) a second conductor aligned relative to said first conductor such that a portion of one of said conductors extends significantly beyond the other; and

    (c) a liquid crystal material optically responsive to an electric field and positioned between said first and second conductors;

    (II) bringing said device into the proximity of said electrical component, but without making electrical contact with either said component or with ground, such that said first and second conductors are positioned at different areas of intensity of said electric field; and

    (III) observing the optical state of said liquid crystal display element.

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