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 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.
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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.
26 Citations
12 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 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. - View Dependent Claims (2, 3, 4, 10)
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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 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 and which shapes each 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. - View Dependent Claims (6, 7, 8, 9, 11)
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12. A projection method comprising:
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emitting a plurality of laser beams including beamlets, along different optical axes, from a laser light source;
focusing each of the laser beams on a different diffraction pattern of a diffractive optical element;
spatially averaging the laser beamlets;
shaping each of the plurality of laser beamlets to have a cross-sectional shape matching the shape of a display device;
forming images using the laser beamlets that have passed through the diffractive optical element and have become incident on the display device;
enlarging and projecting the images onto a screen.
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Specification