Reduced micromirror mirror gaps for improved contrast ratio
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United States of America Patent
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Feb 22, 2000
Grant Date -
N/A
app pub date -
Nov 23, 1998
filing date -
Nov 26, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A micromirror array fabricated on a semiconductor substrate 708. The micromirrors in the micromirror array logically divided into an interior active region 704 which selectively modulates light striking the mirrors in the interior active region 704, and an exterior border region 702 for producing a dark border around the image produced by the interior active region 704. A gap between each mirror allows adjacent mirrors to rotate. The gap 712 between mirrors in the interior active region 704 of the array is larger than the gap 710 between at least some of the mirrors in the exterior border region 702. The smaller gap 710 in the exterior region 702 is enabled by restricting mirrors in the exterior region 702 to a single direction of rotation.
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