Illumination system eliminating laser speckle and projection TV employing the same
First Claim
Patent Images
1. An illumination system comprising:
- a laser light source which emits a plurality of laser beams including beamlets and having different wavelengths along different optical axes; and
a diffractive optical element which spatially averages the laser beamlets by superimposing the laser beamlets on a display device to remove speckles of the laser beamlets, and which shapes each of the laser beamlets to have a cross-sectional shape matching the cross-sectional shape of the display device,wherein the diffractive optical element has fragments corresponding to the different wavelengths of the plurality of laser beams.
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Abstract
Provided are an illumination system, a projection TV employing the illumination system, and a projection method. The illumination system includes: a laser light source which emits a plurality of laser beams including beamlets along different optical axes; and a diffractive optical element which spatially averages the laser beamlets by superimposing the laser beamlets to remove speckles of the laser beamlets and which shapes each of the laser beamlets.
14 Citations
10 Claims
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1. An illumination system comprising:
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a laser light source which emits a plurality of laser beams including beamlets and having different wavelengths along different optical axes; and a diffractive optical element which spatially averages the laser beamlets by superimposing the laser beamlets on a display device to remove speckles of the laser beamlets, and which shapes each of the laser beamlets to have a cross-sectional shape matching the cross-sectional shape of the display device, wherein the diffractive optical element has fragments corresponding to the different wavelengths of the plurality of laser beams. - View Dependent Claims (2, 3, 4)
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5. A projection TV comprising:
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a laser light source which emits a plurality of laser beams including beamlets and having different wavelengths along different optical axes; a diffractive optical element which spatially averages the laser beamlets by overlapping the laser beamlets to remove speckles of the laser beamlets; a display device which forms images using the laser beamlets that have passed through the diffractive optical element; and a projection lens unit which enlarges and projects the images onto a screen, wherein the diffractive optical element overlaps the laser beamlets on the display device, and shapes each of the laser beamlets to have a cross-sectional shape matching the cross-sectional shape of the display device, and wherein the diffractive optical element has fragments corresponding to the different wavelengths of the plurality of laser beams. - View Dependent Claims (6, 7, 8, 9)
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10. A projection method comprising:
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emitting a plurality of laser beams including beamlets and having different wavelengths along different optical axes from a laser light source; focusing each of the laser beamlets on a different diffraction pattern of a diffractive optical element; spatially averaging the laser beamlets; superimposing the laser beamlets on a display device; shaping each of the plurality of laser beamlets to have a cross-sectional shape matching the cross-sectional shape of the display device; forming images using the laser beamlets that have passed through the diffractive optical element and have become incident on the display device; and enlarging and projecting the images onto a screen, wherein the diffractive optical element has fragments corresponding to the different wavelengths of the plurality of laser beams.
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Specification