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Dual function electro-optical display device exhibiting a bistable image or a fugitive image depending the applied voltage

  • US 5,604,616 A
  • Filed: 04/03/1995
  • Issued: 02/18/1997
  • Est. Priority Date: 04/03/1995
  • Status: Expired due to Term
First Claim
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1. A dual function electro-optical display device, comprising:

  • a liquid crystal medium having at least two possible light modulating modes, a first nematic mode being responsive to a first voltage to form a fugitive image, and a second cholesteric mode being responsive to a second voltage to form a persistent image.

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