Curved retarder-based optical filters
First Claim
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1. A method for manufacturing a curved filter having a retardation axis in a desired orientation, the method comprising:
- providing a planar retarder film having an optical axis;
providing a planar polarization film;
predetermining an angle at which the planar retarder film would be laminated to the planar polarization film;
laminating the planar retarder film and the planar polarization film at the predetermined angle;
bending the laminated retarder and polarization films, whereby a stress is exerted on the retarder film, the stress causing a stress-induced birefringence in the retarder film; and
wherein the predetermined angle substantially compensates for the stress-induced birefringence and allow the optical axis of the retarder film to be in the desired orientation.
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Abstract
Curved polarization filters and methods of manufacturing such filters. The method includes laminating a planar polarization layer to a planar retarder layer at a predetermined orientation and bending the laminate to create a curved filter. The strain on the retarder layer results in stress-induced birefringence, and the predetermined orientation of the retarder substantially compensates for the stress-induced birefringence. In some embodiments, the predetermination is based on mathematical models. In some other embodiment, the predetermination is based on experimental data.
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Citations
23 Claims
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1. A method for manufacturing a curved filter having a retardation axis in a desired orientation, the method comprising:
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providing a planar retarder film having an optical axis; providing a planar polarization film; predetermining an angle at which the planar retarder film would be laminated to the planar polarization film; laminating the planar retarder film and the planar polarization film at the predetermined angle; bending the laminated retarder and polarization films, whereby a stress is exerted on the retarder film, the stress causing a stress-induced birefringence in the retarder film; and wherein the predetermined angle substantially compensates for the stress-induced birefringence and allow the optical axis of the retarder film to be in the desired orientation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical filter in a curved configuration, the filter comprising:
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a retarder layer coupled to a polarizer layer; wherein the retarder layer and polarizer layer are configured to have a compound curvature, wherein the retarder layer is made of a material having a strain optic coefficient K, a thickness of d, and a retardance of Γ
, and wherein the ratio - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An optical filter in a curved configuration, the filter comprising:
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a polarization layer; and a retarder layer laminated to the polarization layer at a predetermined angle, wherein the retarder and polarization layers are bent to the curved configuration, wherein the retarder layer has a stress-induced birefringence, and further wherein the predetermined angle substantially compensates for the stress-induced birefringence and disposes the optical axis of the retarder film in a desired orientation. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification