×

Polarized, LED-based illumination source

  • US 8,029,142 B2
  • Filed: 11/12/2010
  • Issued: 10/04/2011
  • Est. Priority Date: 05/19/2005
  • Status: Expired due to Fees
First Claim
Patent Images

1. An illumination source, comprising:

  • an array of one or more light emitting diodes (LEDs) capable of emitting light at a first wavelength;

    a first light collecting/focusing unit to form at least some of the light at the first wavelength into a telecentric beam;

    a phosphor capable of generating light at a second wavelength when illuminated by light at the first wavelength, the telecentric beam being directed to the phosphor;

    a reflective polarizer disposed to transmit light at the second wavelength, received from the phosphor, in a first polarization state and to reflect light at the second wavelength in a second polarization state back to the phosphor; and

    a polarization control element disposed between the phosphor and the reflective polarizer.

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