Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2010-11-12
2011-10-04
Epps, Georgia (Department: 2878)
Optics: image projectors
Polarizer or interference filter
C353S037000, C353S050000, C353S091000, C353S094000, C362S555000, C385S133000
Reexamination Certificate
active
08029142
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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Conner Arlie R.
Donnelly Sean M.
Oehler Peter R.
3M Innovative Properties Company
Cruz Magda
Epps Georgia
Storvick Kristofor L.
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