Charge controlled mirror with improved frame time utilization and method of addressing the same
First Claim
Patent Images
1. A charge controlled mirror (CCM), comprising:
- an array of electrostatically actuable micromirrors;
a pixelized beam addressing surface in electrical communication with said array where each pixel has first and second portions that exhibit secondary emission coefficients that are respectively less than and greater than one for a given beam energy; and
a conductive grid spaced apart from said addressing surface for collecting secondary electrons that are ejected from said first and second portions of said addressing surface.
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Abstract
A beam addressed electrostatically-actuated charge controlled mirror (CCM) with frame time utilization approaching 100% is provided by partially coating the CCM'"'"'s pixelized beam addressing surface with a material having the opposite electron affinity. Each pixel of the pixelized beam addressing surface has first and second portions that exhibit secondary emission coefficients that are respectively less than and greater than one for the same beam energy. A beam or beams that are capable of subpixel resolution selectively address each pixel'"'"'s first and second portions to control the amount of charge on the pixelized beam addressing surface and its localized potentials.
59 Citations
21 Claims
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1. A charge controlled mirror (CCM), comprising:
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an array of electrostatically actuable micromirrors; a pixelized beam addressing surface in electrical communication with said array where each pixel has first and second portions that exhibit secondary emission coefficients that are respectively less than and greater than one for a given beam energy; and a conductive grid spaced apart from said addressing surface for collecting secondary electrons that are ejected from said first and second portions of said addressing surface. - View Dependent Claims (2, 3, 4)
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5. A charge controlled mirror (CCM), comprising:
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an array of electrostatically actuable micromirrors, each said micromirror having an addressing surface that exhibits a secondary emission coefficient less than one; an array of control pads that partially cover the respective micromirrors'"'"' addressing surfaces and which exhibit a secondary emission coefficient greater than one; and a grid that is spaced apart from said array of micromirrors and held at a fixed positive potential with respect to said micromirrors. - View Dependent Claims (6)
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7. A light modulator, comprising:
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a charge controlled mirror (CCM) comprising; an array of electrostatically actuable micromirrors; a pixelized beam addressing surface in electrical communication with said array in which each pixel has a first and second portions that exhibit secondary emission coefficients that are respectively less than and greater than one for a given beam energy; and a conductive grid spaced apart from said addressing surface for collecting secondary electrons that are ejected from said first and second portions; and a source that selectively addresses each pixel'"'"'s first and second portions with a charge beam having subpixel resolution at said beam energy to write a charge pattern onto the pixelized beam-addressing surface. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of addressing a charge controlled mirror (CCM) having a pixelized beam addressing surface in which each pixel has first and second portions that exhibit secondary emission coefficients that are respectively less than and greater than one for a given beam energy comprising:
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selectively directing a charge beam onto said first and second portions at the given beam energy to eject secondary electrons and respectively lower and raise the pixel potential to a desired value; and collecting the secondary electrons to hold the pixel potential. - View Dependent Claims (18, 19, 20, 21)
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Specification