Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2005-12-23
2009-06-02
Lee, Diane I (Department: 2851)
Optics: image projectors
Polarizer or interference filter
C353S084000, C353S094000, C353S054000, C362S612000, C362S555000, C359S583000, C359S629000
Reexamination Certificate
active
07540616
ABSTRACT:
Light emitting diodes (LEDs) emit light at a first wavelength. A phosphor material close to LEDs converts at least some of the light to a second wavelength. The light at both wavelengths passes through a light collecting unit. A reflecting polarizer transmits both wavelengths in a first polarization state and reflects light at both wavelengths in a second, orthogonal, polarization state. Light reflected by the reflective polarizer is directed back towards the phosphor material without any substantial increase in angular range. The resulting output light beam contains polarized light at the first and second wavelengths. In some embodiments, an array of LEDs includes LEDs that emit light at a first wavelength and others that emit light at a second wavelength. The phosphor material is disposed on the LEDs emitting the light at the first wavelength.
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3M Innovative Properties Company
Cruz Magda
Lee Diane I
LandOfFree
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