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Reflective display apparatus

  • US 3,947,091 A
  • Filed: 09/19/1974
  • Issued: 03/30/1976
  • Est. Priority Date: 09/19/1974
  • Status: Expired due to Term
First Claim
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1. A reflective type display apparatus comprising:

  • a. display means having transparent areas and areas capable of light scattering, said areas together defining indicia to be displayed;

    b. light reflective means disposed at the back of said display means;

    c. transparent light refracting means disposed at the front of said display means and providing a transparent region between said display means and an observer wherein the index of refraction is greater than that of the environmental medium in which the display is operating, said transparent light refracting means configured to include (i) a rear surface in juxtaposition with said display means, and (ii) a front surface nonparallel to said rear surface; and

    d. light absorptive means disposed continuously along a path between said front surface and said display means up to and touching said light reflective means, whereby substantially no light can enter the apparatus except from the front surface of said transparent light refracting means;

    said light absorptive means further disposed relative to said front surface such that at least some specularly reflected rays propagating from said transparent areas are routed to said absorptive means only after internal reflection from said front surface, whereby said front surface is employed to provide an image of, and extend the effect of, said absorptive means.

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