Illumination apparatus

Details Illumination apparatus Illumination apparatus

2007-04-03

2007-04-03

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S089000, C353S094000, C353S102000, C353S121000

Reexamination Certificate

active

10930418

ABSTRACT:
An apparatus including a spatially modulated extended light source configured to project an output having at least one region of diminished illumination, and an array of polarizing beam splitters (PBSs) positioned proximal to the spatially modulated extended light source. The light source includes at least two light outputs configured to project unpolarized light; and at least one gap interspersed between the light outputs. The array of PBSs is configured to receive the output from the light source, convert the unpolarized light to light having a first polarized state, and remove the at least one region of diminished illumination. A method including splitting unpolarized light emitted from each light emission aperture of a spatially modulated extended light source into a first beam having a first polarized state and a second beam having a second polarized state, converting the second beam from the second polarized state to the first polarized state, and transmitting the first beam having the first polarized state and the second beam having the first polarized state.

REFERENCES:
patent: 6222674 (2001-04-01), Ohta
patent: 6473240 (2002-10-01), Dehmlow
patent: 6513937 (2003-02-01), Dehmlow
patent: 6726329 (2004-04-01), Li et al.
patent: 7055965 (2006-06-01), Koba
patent: 7101048 (2006-09-01), Travis

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