High-contrast display system with scanned conformal grating device
First Claim
1. An improved projection system that includes a conformal grating electromechanical system (GEMS) device for forming an image on a medium, comprising:
- a) a light source providing illumination;
b) a linear array of conformal GEMS devices receiving the illumination;
c) an obstructing element for blocking a zeroth order reflected light beam from reaching the medium;
d) a cross-order filter, placed substantially near a Fourier plane of a lens system, for blocking a plurality of diffracted cross-order light beams from reaching the medium;
e) a scanning element for moving non-obstructed diffracted light beams relative to the medium, and f) a controller for providing a data stream to the linear array of conformal GEMS devices.
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Accused Products
Abstract
An improved projection system that includes a conformal grating electromechanical system (GEMS) device for forming an image on a medium, and also including: a light source providing illumination; a linear array of conformal GEMS devices receiving the illumination; an obstructing element for blocking a zeroth order reflected light beam from reaching the medium; a cross-order filter placed substantially near a Fourier plane of a lens system for blocking a plurality of diffracted cross-order light beams from reaching the medium; a scanning element for moving non-obstructed diffracted light beams relative to the medium; and a controller for providing a data stream to the linear array of conformal GEMS devices.
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Citations
33 Claims
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1. An improved projection system that includes a conformal grating electromechanical system (GEMS) device for forming an image on a medium, comprising:
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a) a light source providing illumination;
b) a linear array of conformal GEMS devices receiving the illumination;
c) an obstructing element for blocking a zeroth order reflected light beam from reaching the medium;
d) a cross-order filter, placed substantially near a Fourier plane of a lens system, for blocking a plurality of diffracted cross-order light beams from reaching the medium;
e) a scanning element for moving non-obstructed diffracted light beams relative to the medium, and f) a controller for providing a data stream to the linear array of conformal GEMS devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 30, 32)
a polarization sensitive beam splitter;
a waveplate; and
a stop to block the zeroth order reflected light beam.
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10. The improved projection system as claimed in claim 1, wherein the cross-order filter blocks (+1,+1), (+1,−
- 1), (−
1,+1) and (−
1,−
1) orders of the diffracted cross-order light beams.
- 1), (−
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11. The improved projection system as claimed in claim 1, wherein the scanning element is an appropriately-sized scanning mirror so that the diffracted cross-order light beams pass above and below the scanning mirror, thus being functionally equivalent to the cross-order filter.
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12. The improved projection system as claimed in claim 1, wherein the obstructing element and the cross-order filter are structurally integrated.
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30. The improved projection system as claimed in claim 1, wherein the light source is a laser.
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32. The improved projection system as claimed in claim 1, wherein a grating period is oriented perpendicular to a long axis of the linear array.
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13. An improved projection system that includes a conformal grating electromechanical system (GEMS) device for forming a multi-color image on a medium, comprising:
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a) a plurality of light sources providing illumination;
b) at least one linear array of conformal GEMS devices receiving the illumination;
c) an obstructing element for blocking a zeroth order reflected light beam from reaching the medium;
d) a cross-order filter, placed substantially near a Fourier plane of a lens system, for blocking a plurality of diffracted cross-order light beams from reaching the medium;
e) a scanning element for moving non-obstructed diffracted light beams relative to the medium; and
f) a controller for providing a data stream to at least one linear array of conformal GEMS devices receiving the illumination. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 33)
a polarization sensitive beam splitter;
a waveplate; and
a stop to block the zeroth order reflected light beam.
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22. The improved projection system as claimed in claim 13, wherein the cross-order filter blocks (+1,+1), (+1,−
- 1), (−
1,+1), and (−
1,−
1) orders of the diffracted cross-order light beams.
- 1), (−
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23. The improved projection system as claimed in claim 13, wherein the scanning element is an appropriately-sized scanning mirror so that the diffracted cross-order light beams pass above and below the scanning mirror, thus being functionally equivalent to the cross-order filter.
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24. The improved projection system as claimed in claim 13, wherein the obstructing element and the cross-order filter are structurally integrated.
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25. The improved projection system as claimed in claim 13, further comprises at least three light sources of different colors.
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26. The improved projection system as claimed in claim 25, wherein the at least three light sources each illuminate a different and respective linear array of conformal GEMS devices.
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27. The improved projection system as claimed in claim 26, further comprises a color-combining element.
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28. The improved projection system as claimed in claim 27, wherein each different and respective linear array of conformal GEMS devices has its own obstructing element prior to the color-combining element, and a single cross-order filter is placed after the color-combining element.
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29. The improved projection system as claimed in claim 27, wherein the obstructing element and the cross-order filter are structurally integrated.
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31. The improved projection system as claimed in claim 13, wherein the plurality of light sources are lasers.
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33. The improved projection system as claimed in claim 13, wherein a grating period is oriented perpendicular to a long axis of the linear array.
Specification