Polarizing turning film with reduced color separation
First Claim
Patent Images
1. A turning film comprising a light entry and a light exit surface comprising first prismatic structures on the exit surface and second prismatic structures or lenticular structures on the light entry surface, wherein(a) the first prismatic elements are characterized by a far base angle (β
-
1) and a near base angle (β
2); and
(b) the second prismatic or lenticular elements are characterized by a far base angle (γ
1) and a near base angle (γ
2);
provided that the values of the angles in subparagraphs (a) and (b) are selected to provide a reduced degree of color separation compared to the same film with only the first prismatic elements on the exit surface.
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Abstract
The disclosure describes a turning film and a backlight containing the film. The turning film comprises a light entry and a light exit surface comprising first prismatic structures on the exit surface and second prismatic structures or lenticular structures on the light entry surface, wherein
- (a) the first prismatic elements are characterized by a far base angle (β1) and a near base angle (β2); and
- (b) the second prismatic or lenticular elements are characterized by a far base angle (γ1) and a near base angle (γ2);
- provided that the values of the angles in subparagraphs (a) and (b) are selected to provide a reduced degree of color separation compared to the same film with only the first prismatic elements on the exit surface.
21 Citations
6 Claims
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1. A turning film comprising a light entry and a light exit surface comprising first prismatic structures on the exit surface and second prismatic structures or lenticular structures on the light entry surface, wherein
(a) the first prismatic elements are characterized by a far base angle (β -
1) and a near base angle (β
2); and(b) the second prismatic or lenticular elements are characterized by a far base angle (γ
1) and a near base angle (γ
2);provided that the values of the angles in subparagraphs (a) and (b) are selected to provide a reduced degree of color separation compared to the same film with only the first prismatic elements on the exit surface. - View Dependent Claims (2, 3, 4, 5, 6)
-
1) and a near base angle (β
Specification
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Current AssigneeSKC Haas Display Films Co., Ltd. (Dow, Inc.)
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Original AssigneeRohm and Haas Denmark Finance A/S
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InventorsHong, Qi, Mi, Xiang-Dong
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Application NumberUS12/074,978Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current359/487CPC Class CodesG02B 6/0053 Prismatic sheet or layer; B...G02B 6/0056 for producing polarisation ...
