×

Compact back projection device having either a diffractive optical component or two optical mixing components

  • US 5,734,447 A
  • Filed: 04/03/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 04/07/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A back projection device comprising:

  • an image generator which generates a small-sized image;

    a projection optical component which converts the small-sized image into a large-sized image;

    a screen on which a final image is formed;

    at least one onward reflection component located at an acute angle to the screen; and

    an optical mixing component, having a predetermined length, located between said at least one onward reflection component and said screen, wherein the large-sized image is substantially reflected along an entirety of said predetermined length for a first range of incident angles and wherein an image reflected by the onward reflection component is substantially transmitted along the entirety of said predetermined length for a second range of incident angles to form the final image,wherein the optical mixing component is a diffractive optical component having a reflectivity which is selective as a function of a range of incident angles.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×