Laser projection system with a spinning polygon for speckle mitigation
First Claim
1. A laser projection system comprising:
- (i) a coherent light source including at least one laser configured to emit an output beam;
(ii) a scanning optics, the scanning optics comprising at least one scanning reflector, the scanning reflector positioned in an optical path of the output beam; and
(iii) a rotating polygon prism;
wherein;
(a) the scanning reflector is configured to direct the output beam towards the polygon prism and scan the output beam across a projection surface to generate a projected image comprising successive image frames; and
(b) the polygon prism is configured to transmit the scanned output beam through its body, and create a virtual image of the scanning reflector, such that said virtual image of the scanning reflector laterally moves within a plane and is projected onto the projector surface at a different incident angle Θ
at each successive image frame such that a different speckle pattern is generated at each successive image frame as said polygon prism rotates, thereby reducing speckle contrast in the projected image at the projection surface.
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Accused Products
Abstract
A laser projection system comprises: (i) a coherent light source including at least one laser configured to emit an output beam carrying signal data; (ii) a scanning optics, the scanning optics comprising at least one scanning reflector, the scanning reflector positioned in an optical path of the output beam; and (iii) a rotating polygon prism; wherein (a) the scanning reflector is configured to direct the output beam towards the polygon prism and scan the output beam across a projection surface; and (b) the polygon prism is configured to transmit the scanned output beam through its body, and create a virtual image of the scanning reflector, such that said virtual image of the scanning reflector is moving when said polygon prism rotates.
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Citations
20 Claims
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1. A laser projection system comprising:
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(i) a coherent light source including at least one laser configured to emit an output beam; (ii) a scanning optics, the scanning optics comprising at least one scanning reflector, the scanning reflector positioned in an optical path of the output beam; and (iii) a rotating polygon prism;
wherein;(a) the scanning reflector is configured to direct the output beam towards the polygon prism and scan the output beam across a projection surface to generate a projected image comprising successive image frames; and (b) the polygon prism is configured to transmit the scanned output beam through its body, and create a virtual image of the scanning reflector, such that said virtual image of the scanning reflector laterally moves within a plane and is projected onto the projector surface at a different incident angle Θ
at each successive image frame such that a different speckle pattern is generated at each successive image frame as said polygon prism rotates, thereby reducing speckle contrast in the projected image at the projection surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A laser projection system comprising:
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(i) a coherent light source including at least one laser configured to emit an output beam; (ii) a rotating polygon prism having a substantially transparent body; and (iii) a scanning optics situated between said coherent light source and said rotating polygon, said scanning optics comprising at least one scanning reflector and situated (a) to intercept the output beam provided by the coherent light source, (b) to direct the output beam towards the polygon prism, and (c) to scan the output beam across a projection surface, wherein the polygon prism is configured to transmit the scanned output beam through its body such that a rotation of the polygon prism changes an angle of incidence Θ
of the scanned output beam such that a virtual image of the at least one scanning reflector laterally moves within a plane and is projected upon the projection surface to vary a speckle pattern at the projection surface over time, thereby reducing speckle contrast produced by the scanned output beam at the projection surface. - View Dependent Claims (20)
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Specification