TURNING FILM, DISPLAY APPARATUS, AND PROCESS
First Claim
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1. A light redirecting article for redirecting light toward a target angle, the light redirecting article comprising:
- (a) an input surface for accepting incident illumination over a range of incident angles;
(b) an output surface comprising a plurality of light redirecting structures each light redirecting structure having;
(i) an exit surface sloping away from normal in one direction as defined by a first base angle P1 relative to the input surface; and
(ii) a second surface sloping away from normal, in the opposite direction relative to the exit surface, as defined by a second base angle P2 relative to the input surface;
wherein first and second surfaces are opposed to each other at an angle α
that is in the range from 35 to 55 degrees;
wherein the light redirecting article is formed from a material having an index of refraction less than 1.60; and
wherein the target angle θ
out is in the range from 5 to 25 degrees.
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Abstract
A light redirecting article for redirecting light toward comprises:
- a light exit surface with features meeting certain requirements;
- wherein first and second surfaces of the features are opposed to each other at an angle α that is in the range from 35 to 55 degrees;
- wherein the light redirecting article is formed from a material having an index of refraction less than 1.60; and
- wherein the target angle is from 5 to 25 degrees.
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Citations
20 Claims
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1. A light redirecting article for redirecting light toward a target angle, the light redirecting article comprising:
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(a) an input surface for accepting incident illumination over a range of incident angles; (b) an output surface comprising a plurality of light redirecting structures each light redirecting structure having; (i) an exit surface sloping away from normal in one direction as defined by a first base angle P1 relative to the input surface; and (ii) a second surface sloping away from normal, in the opposite direction relative to the exit surface, as defined by a second base angle P2 relative to the input surface; wherein first and second surfaces are opposed to each other at an angle α
that is in the range from 35 to 55 degrees;wherein the light redirecting article is formed from a material having an index of refraction less than 1.60; and wherein the target angle θ
out is in the range from 5 to 25 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A display apparatus comprising:
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(a) an illumination source for emitting illumination over a range of angles; (b) a light redirecting article for redirecting light toward a target angle, the light redirecting article comprising; (1) an input surface for accepting incident illumination over a range of incident angles; (2) an output surface comprising a plurality of light redirecting structures each light redirecting structure having; (i) an exit surface sloping away from normal in one direction as defined by a first base angle β
1 relative to the input surface; and(ii) a second surface sloping away from normal, in the opposite direction relative to the exit surface, as defined by a second base angle β
2 relative to the input surface;wherein first and second surfaces are opposed to each other at an angle α
that is in the range from 35 to 55 degrees;wherein the light redirecting article is formed from a material having an index of refraction less than 1.60; and wherein the target angle θ
out is in the range from 5 to 25 degrees; and(c) a light gating device for forming an image by modulating the output light from the light redirecting article. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification
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Current AssigneeRohm and Haas Denmark Finance A/S (Dow, Inc.)
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Original AssigneeRohm and Haas Denmark Finance A/S (Dow, Inc.)
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InventorsMi, Xiang-Dong, Greener, Jehuda
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Application NumberUS11/762,089Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current359/238CPC Class CodesG02B 6/0053 Prismatic sheet or layer; B...
