Projection type image display device
First Claim
1. A projection type image display device comprising:
- at least one laser light source that emits laser light;
a spatial light modulation element that modulates the laser light in response to a picture signal;
a pixel separation element that spatially separates the modulated laser light exiting from the spatial light modulation element into a plurality of light beams using birefringence;
a projection optical system that projects the modulated laser light exiting from the pixel separation element upon a screen;
anda pixel separation element modulator that controls the pixel separation element so as to modulate temporally the direction of birefringence of the pixel separation element.
1 Assignment
0 Petitions
Accused Products
Abstract
Red, green, and blue laser light emitted from laser light sources 1-3 is transformed into substantially parallel beams by collimator lenses 4-6, collected by microlens arrays 7-9, and rendered uniform by rod integrators 10-12, whereupon it is used to illuminate spatial light modulation elements 16-18 and subjected to modulation. The modulated laser light exiting from the spatial light modulation elements 16-18 is recombined using a beam-combining prism 19 and subjected to pixel separation using a birefringent plate 20, which is rotationally driven by a birefringent plate rotary drive unit 26, after which it is projected upon a screen 22 using a projection optical system 21. The birefringent plate 20 spatially separates the modulated laser light using birefringence. When pixels are spatially separated by the birefringent plate, the pixel grid region is made smaller, the distribution of brightness on the screen is rendered uniform, and speckle noise is reduced.
25 Citations
9 Claims
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1. A projection type image display device comprising:
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at least one laser light source that emits laser light; a spatial light modulation element that modulates the laser light in response to a picture signal; a pixel separation element that spatially separates the modulated laser light exiting from the spatial light modulation element into a plurality of light beams using birefringence; a projection optical system that projects the modulated laser light exiting from the pixel separation element upon a screen; and a pixel separation element modulator that controls the pixel separation element so as to modulate temporally the direction of birefringence of the pixel separation element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification