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Luminescent writing or display device

  • US 4,927,748 A
  • Filed: 02/27/1989
  • Issued: 05/22/1990
  • Est. Priority Date: 02/27/1989
  • Status: Expired due to Term
First Claim
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1. An improved writing and display device for producing a luminescent image upon the application of a pressure thereon comprisinga transparent plastic sheet having means comprising a primary low volatile plasticizer, and containing a luminescent tinting material integrally dispersed throughout said plastic sheet,an opaque white sheet disposed contiguous to said transparent sheet to be in direct interfacing relationship therewith,said transparent sheet and tinting materials therein being in overlying relationship and in direct contacting relationship to said opaque sheet,and said sheets each having an exposed smooth surface for direct contact at the inteface thereof,said means being capable of prohibiting the migration of said tinting material from said transparent sheet and onto said underlying opaque sheet in direct contact therewith,and at least one of said sheets being pliable so that upon the application of pressure thereon, the respective smooth surfaces of said sheets are urged into intimate contact at the points of the applied pressure to form a luminescent image along the points of applied pressure that will be retained so long as said sheets are adhered to one another along the points of applied pressure,whereby any protective insert between said transparent and opaque sheet during non-use of said display device is rendered unnecessary.

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