Projection system
First Claim
Patent Images
1. A display device for use in a projection apparatus comprising:
- a light source;
means effective to direct a beam of light onto at least one deformable mirror array, the deformable mirror array being effective to reflect the light beam to produce a spatially modulated beam at a non zero angle to the incident beam;
wherein the light path to the deformable mirror array comprises a prism assembly including at least two air gaps effective to cause the incident light beam to pass along a first direction to be incident on said one deformable mirror device, and to cause the spatially modulated light beam produced by said one deformable mirror device to pass along a second direction different from the first direction, the two air gaps being arranged to provide mutual compensation for astigmatism.
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Accused Products
Abstract
A projection system includes a light source (16) and a prism assembly (41) including at least one air gap (45) effective both to deflect incident light on to at least one reflective spatial light modulator (10), and to transmit modulated light produced by the spatial light modulator (10).
41 Citations
16 Claims
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1. A display device for use in a projection apparatus comprising:
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a light source; means effective to direct a beam of light onto at least one deformable mirror array, the deformable mirror array being effective to reflect the light beam to produce a spatially modulated beam at a non zero angle to the incident beam; wherein the light path to the deformable mirror array comprises a prism assembly including at least two air gaps effective to cause the incident light beam to pass along a first direction to be incident on said one deformable mirror device, and to cause the spatially modulated light beam produced by said one deformable mirror device to pass along a second direction different from the first direction, the two air gaps being arranged to provide mutual compensation for astigmatism. - View Dependent Claims (2, 10)
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3. A display device for use in a projection apparatus comprising:
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a light source; means effective to direct a beam of light onto at least one deformable mirror array, the deformable mirror array being effective to reflect the light beam to produce a spatially modulated beam at a non zero angleto the incident beam; wherein the light path to the deformable mirror array comprises a prism assembly including at least two air gaps effective to cause the incident light beam to pass along a first direction onto said one deformable mirror device, and to cause the spatially modulated light beam produced by said one deformable mirror device to pass along a second direction different from the first direction, the light paths in and out of the prism assembly being substantially coaxial. - View Dependent Claims (4)
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5. A display device for use in a projection apparatus comprising:
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a light source; means effective to direct a beam of light onto at least one deformable mirror array effective to reflect the light beam incident on the array to produce a spatially modulated beam at a non zero angle to the incident beam; and at least one dichroic surface for splitting light from the light source into different colour component beams and subsequently recombining the spatially modulated light into a single beam, in which said dichroic surface is arranged such that the beams to and from the deformable mirror device intersect the dichroic surface at two different regions of the surface, and the dichroic surface is designed such that the first and second regions have different spectral characteristics. - View Dependent Claims (7, 8, 9)
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6. A display device for use in a projection apparatus comprising:
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a light source; means effective to direct a beam of light onto a plurality of deformable mirror arrays, each effective to reflect the light beam incident on the array to produce a spatially modulated beam at a non zero angle to the incident beam; including at least one dichroic surface arranged to split light from the light source into different colour component beams and subsequently to recombine the spatially modulated light into a single beam, wherein the dichroic surface is arranged such that the beams to and from the deformable mirror device intersect the dichroic surface at different angles thereby to achieve a controlled loss at the dichroic surface and adjust the colorimetry of the display device. - View Dependent Claims (11)
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12. A projection apparatus comprising:
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a light source; at least one deformable mirror array; means effective to direct a beam of light onto said at least one deformable mirror array, the deformable mirror array being effective to reflect the light beam to produce a spatially modulated beam at a non zero angle to the incident beam; wherein the light path to the deformable mirror array comprises a prism assembly including at least two air gaps effective to cause the incident light beam to pass along a first direction to be incident on said one deformable mirror array, and to cause the spatially modulated light beam produced by said one deformable mirror array to pass along a second direction different from the first direction, the two air gaps being arranged to provide mutual compensation for astigmatism. - View Dependent Claims (16)
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13. A projection apparatus comprising:
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a light source; at least one deformable mirror array; means effective to direct a beam of light onto said at least one deformable mirror array, the deformable mirror array being effective to reflect the light beam to produce a spatially modulated beam at a non zero angle to the incident beam; wherein the light path to the deformable mirror array comprises a prism assembly including at least two air gaps effective to cause the incident light beam to pass along a first direction onto said one deformable mirror array, and to cause the spatially modulated light beam produced by said one deformable mirror array to pass along a second direction different from the first direction, the light paths in and out of the prism assembly being substantially coaxial.
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14. A projection apparatus comprising:
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a light source; at least one deformable mirror array; means effective to direct a beam of light onto said at least one deformable mirror array effective to reflect the light beam incident on the array to produce a spatially modulated beam at a non zero angle to the incident beam; and at least one dichroic surface for splitting light from the light source into different color component beams and subsequently recombining the spatially modulated light into a single beam, in which said dichroic surface is arranged such that the beams to and from the deformable mirror array intersect the dichroic surface at two different regions of the surface, and the dichroic surface is designed such that the first and second regions have different spectral characteristics.
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15. A projection apparatus comprising:
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a light source; means effective to direct a beam of light onto a plurality of deformable mirror arrays, each effective to reflect the light beam incident on the array to produce a spatially modulated beam at a non zero angle to the incident beam; including at least one dichroic surface arranged to split light from the light source into different color component beams and subsequently to recombine the spatially modulated light into a single beam, wherein the dichroic surface is arranged such that the beams to and from the deformable mirror device intersect the dichroic surface at different angles thereby to achieve a controlled loss at the dichroic surface and adjust the colorimetry of the display device.
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Specification