Optical film with variable angle prisms
Assignee3M Company
InventorsMark E. Gardiner, Sanford Cobb, Kenneth A. Epstein, Wade D. Kretman
Life of this patent
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Abstract
An optical turning film has a first surface including an array of prisms. The array has a plurality of first prisms, with each of the first prisms having a first prism configuration, and a plurality of second prisms, with each of the second prisms having a second prism configuration different from the first prism configuration. The optical film also has a second surface opposing the first surface, and light rays incident to the first surface are directed by the plurality of first prism and the plurality of second prisms along a direction substantially parallel to a viewing axis.
Claims18
An optical turning film comprising:
- a first surface;
- an array of prisms formed in the first surface, wherein the array of prisms has:
- a plurality of first prisms, each of the first prisms having a first prism angular orientation with respect to a normal to the first surface;
- a plurality of second prisms, each of the second prisms having a second prism angular orientation, different from the first angular orientation, with respect to the normal;
- and
- a second surface opposing the first surface.
An optical turning film comprising:
- a first surface;
- an array or prisms formed in the first surface, wherein the array of prisms has:
- a plurality of first prisms, each of the first prisms having a first prisms reflecting surface and a first prisms refracting surface and a first prism included angle between the first prisms reflecting surface and the first prisms refracting surface;
- a plurality of second prisms, each of the second prisms having a second prisms reflecting surface and a second prisms refracting surface and a second prisms included angle between the first prisms reflecting surface and the first prisms refracting surface, different than the first prisms included angle;
- and
- a second surface opposing the first surface.
Dependencies are inferred from the claim text.