×

Backlighting system with faceted light pipes

  • US 5,202,950 A
  • Filed: 09/23/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 09/27/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A backlighting system for a liquid crystal display, said system having an illuminated front surface, comprising:

  • a first faceted light pipe proximal the illuminated front surface of the backlight having a generally planar front surface for providing light to said illuminated front surface, having a faceted back surface wherein said back surface includes a plurality of generally planar portions parallel to said front surface and a plurality of facets formed at an angle to said front surface and located connecting said back surface parallel portions, and having at least one end surface for receiving light to be transmitted through said front surface;

    a first light source means located adjacent said end surface for receiving light of said first faceted light pipe for providing light to said first light pipe;

    a second faceted light pipe proximal the back surface of the first faceted light pipe having a generally planar front surface situated such that light exiting said front surface enters the back surface of the first faceted light pipe, having a faceted back surface wherein said back surface includes a plurality of generally planar portions parallel to said front surface and a plurality of facets formed at an angle to said front surface and located connecting said back surface parallel portions, and having at least one end surface for receiving light to be transmitted through said front surface; and

    ,a second light source means located adjacent said end surface for receiving light of said second faceted light pipe for providing light to said second light pipe.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×