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Switchable viewfinder display

  • US 20070041684A1
  • Filed: 05/06/2004
  • Published: 02/22/2007
  • Est. Priority Date: 05/09/2003
  • Status: Abandoned Application
First Claim
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1. A symbol generator for presenting information in an optical viewfinder comprising:

  • a first ESBG device having a front side facing towards the viewer and a rear side;

    wherein said ESBG is sandwiched between first and second transparent plates;

    wherein said transparent plates together function as a light guide;

    wherein each said ESBG device contains information encoded in a multiplicity of separately switchable grating regions;

    a plurality of independently switchable transparent electrodes elements, said independently electrodes substantially overlaying said separately switchable grating regions; and

    means for coupling illumination into said transparent plates;

    said ESBG being operative to project the images of said information towards said viewer when said ESBG rear side is illuminated using light of a first wavelength and no electric field is applied to said ESBG.

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