Speckle reduction in laser illuminated projection displays having a one-dimensional spatial light modulator
First Claim
1. A method of projecting light from a coherent light source onto a one-dimensional spatial light modulator as a line of light having a length and a width, the method comprising the steps of:
- dividing the light from the light source in a manner such that the divided light is effectively formed into a rectangular, two-dimensional array of N1×
N2 mutually incoherent light-sources;
projecting light from the mutually incoherent light-sources along a first axis onto the spatial light modulator to form the length of the line of light;
projecting light from the mutually incoherent light-sources along a second, orthogonal axis, onto the spatial light modulator to form the width of the line of light; and
wherein the light-dividing step is accomplished without using any moving components.
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Accused Products
Abstract
A projection display including a one-dimensional light modulator includes an optical arrangement for projecting light from a laser onto the modulator in the form of a line of light. Light from the laser is divided to create in effect a two-dimensional array of mutually incoherent light sources. Light from one axis of the array is projected onto the modulator to form the length of the line of light and light from the other axis of the array is projected onto the modulator to form the width of the line of light. Division of the light is accomplished without the use of any moving component.
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Citations
17 Claims
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1. A method of projecting light from a coherent light source onto a one-dimensional spatial light modulator as a line of light having a length and a width, the method comprising the steps of:
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dividing the light from the light source in a manner such that the divided light is effectively formed into a rectangular, two-dimensional array of N1×
N2 mutually incoherent light-sources;projecting light from the mutually incoherent light-sources along a first axis onto the spatial light modulator to form the length of the line of light; projecting light from the mutually incoherent light-sources along a second, orthogonal axis, onto the spatial light modulator to form the width of the line of light; and wherein the light-dividing step is accomplished without using any moving components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for projecting light onto a one-dimensional spatial light modulator comprising:
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a light source generating a coherent light beam; first means for creating a plurality of mutually incoherent light portions along a first axis perpendicular to the propagation axis of the light beam; second means for creating a plurality of mutually incoherent light portions along a second axis perpendicular to said first axis; and optics for projecting the incoherent light portions onto the one-dimensional spatial light modulator to create a line of light, with the light propagating along said first axis defining the length of the line and with the light propagating along said second axis defining the width of the line. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification