Polarized, led-based illumination source

Details Polarized, led-based illumination source Polarized, led-based illumination source

2008-10-16

2010-12-21

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Polarizer or interference filter

C353S037000, C353S050000, C353S081000, C353S094000, C353S054000, C353S121000, C362S555000, C385S133000

Reexamination Certificate

active

07854514

ABSTRACT:
An illumination source includes a number of light emitting diodes (LEDs) operating at a first wavelength. Light from the LEDs illuminates a phosphor material that generates light at a second wavelength. A reflective polarizer transmits light at the second wavelength in a first polarization state and reflects light at the second wavelength in a second polarization state orthogonal to the first polarization state. The light at the second wavelength reflected by the reflective polarizer is directed back towards the phosphor material without an increase in angular range. In some embodiments the LEDs, having a conformal layer of phosphor material, are attached directly to the first surface of a liquid cooled plate. A liquid coolant contacts a second surface of the plate.

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