Subwavelength optical microstructure light collimating films
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United States of America Patent
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Mar 12, 2002
Grant Date -
N/A
app pub date -
Nov 12, 1999
filing date -
Nov 12, 1999
priority date (Note) -
Expired
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Abstract
A light collimating film has a sheeting having a first side and a second side, wherein the first side includes a series of prisms, and the second side includes a plurality of subwavelength optical microstructures. Another embodiment includes a back lighting display device having a lighting means, a display panel, and a sheeting having a first side and a second side, wherein the first side includes a series of prisms, and the second side includes a plurality of subwavelength optical microstructures. A preferred embodiment includes a back lighting display device having a first collimating film having a first surface with a subwavelength optical microstructure thereon and a second surface with linear prisms having an included angle of greater than about 95 degrees, and a second collimating film having a first surface with a subwavelength optical microstructure thereon and a second surface with linear prisms having an included angle of less than about 85 degrees.
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