High-contrast screen with random microlens array
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United States of America Patent
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-
Mar 2, 2004
Grant Date -
Oct 10, 2002
app pub date -
Feb 7, 2002
filing date -
Feb 7, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
Screens for use with image-forming illumination (53,54) are provided, as well as methods for producing such screens. The screens include an array of lenses (51), a substrate, and a layer of light-absorbing material (55) in which apertures are formed using aperture-forming illumination (52) which passes through the lenses (51). The optical properties of the lenses (51) and the thickness of the substrate are selected so as to maximize the light-blocking area of the layer of light-absorbing material (55) while allowing long-wavelength image-forming illumination (54) to pass through the apertures substantially unimpeded. The array of lenses can be an array of randomized, anamorphic microlenses.
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