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Picture display device

  • US 4,525,710 A
  • Filed: 02/16/1982
  • Issued: 06/25/1985
  • Est. Priority Date: 02/16/1982
  • Status: Expired due to Fees
First Claim
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1. In a picture display device having field effect transistors deposited on a semiconductor layer formed on an insulating substrate in a column and row configuration;

  • a first electrode which is one electrode of said field effect transistor;

    a second electrode which is a transparent electrode deposited on a transparent substrate opposite to said first electrode; and

    a liquid crystal held between the first electrode and the second electrode and to which a voltage is applied by the first and second electrodes, the improvement comprising;

    detecting means for detecting the existence of picture signals and producing a detection signal if the picture signals are temporarily interrupted for more than a given period of time; and

    means for inverting the voltage polarity applied to the liquid crystal held between the first electrode and the second electrode in response to the detection signal.

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