Diffuser having shape profile for reducing speckle noise and a laser projection system employing the same
First Claim
1. A diffuser employed in a laser projection system for reducing speckle noise, the diffuser comprising a scattering pattern,wherein the scattering pattern comprises a plurality of scattering ribbons arranged in a direction of a first axis and extending in a direction parallel to a second axis, andeach of the plurality of scattering ribbons comprises a second surface, wherein a height of the second surface with respect to a first surface defined by the first axis and the second axis varies based on a measuring point on the first axis, and the second surface satisfies the Equations
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Accused Products
Abstract
A diffuser having a shape for reducing speckle noise and a laser projection system including the diffuser are provided. The diffuser is employed by a laser projection system to reduce speckle noise, and includes a scattering pattern. The scattering pattern includes a plurality of scattering ribbons, and a curved surface of each of the plurality of scattering ribbons satisfies equations so that speckle noise is minimized for an aperture size of an optical system.
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Citations
18 Claims
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1. A diffuser employed in a laser projection system for reducing speckle noise, the diffuser comprising a scattering pattern,
wherein the scattering pattern comprises a plurality of scattering ribbons arranged in a direction of a first axis and extending in a direction parallel to a second axis, and each of the plurality of scattering ribbons comprises a second surface, wherein a height of the second surface with respect to a first surface defined by the first axis and the second axis varies based on a measuring point on the first axis, and the second surface satisfies the Equations
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2. A diffuser employed in a laser projection system for reducing speckle noise, the diffuser comprising a scattering pattern,
wherein the scattering pattern comprises a plurality of scattering ribbons arranged in a direction of a first axis and extending in a direction parallel to a second axis, and each of the plurality of scattering ribbons comprises a second surface, wherein a height of the second surface with respect to a first surface defined by the first axis and the second axis varies based on a measuring point on the first axis, and the second surface satisfies the Equation
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7. A laser projection system comprising:
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a laser light source; an optical modulator which modulates light generated from the light source corresponding to image information; a projection lens unit which projects modulated light on a screen; and a diffuser disposed on an optical path facing the screen, wherein; the diffuser oscillates with respect to an optical axis and comprising a scattering pattern, the scattering pattern has an optimized shape profile to minimize speckle noise with respect to an aperture of the laser projection system, the scattering pattern comprises a plurality of scattering ribbons arranged in a direction of a first axis and extending in a direction parallel to a second axis, each of the plurality of scattering ribbons comprises a second surface, a height of the second surface with respect to a first surface defined by the first axis and the second axis varies based on a measuring point on the first axis, and wherein the second surface satisfies the Equations - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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8. A laser projection system comprising:
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a laser light source; an optical modulator which modulates light generated from the light source corresponding to image information; a projection lens unit which projects modulated light on a screen; and a diffuser disposed on an optical path facing the screen, wherein; the diffuser oscillates with respect to an optical axis and comprising a scattering pattern, the scattering pattern has an optimized shape profile to minimize speckle noise with respect to an aperture of the laser projection system, the scattering pattern comprises a plurality of scattering ribbons arranged in a direction of a first axis and extending in a direction parallel to a second axis, each of the plurality of scattering ribbons comprises a second surface, a height of the second surface with respect to a first surface defined by the first axis and the second axis varies based on a measuring point on the first axis, and wherein the second surface satisfies the Equation
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Specification