Optical film with variable angle prisms
First Claim
Patent Images
1. 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, wherein at least one of the first prisms and the second prisms comprises a curved facet.
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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.
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Citations
28 Claims
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1. An optical turning film comprising:
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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, wherein at least one of the first prisms and the second prisms comprises a curved facet.
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2. An optical turning film comprising:
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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, wherein the first prisms angular orientation and the second prisms angular orientation each comprise an angle in the range from −
1.5°
to 1.5°
.
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3. An optical turning film comprising:
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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 refracting surface and a first prism reflecting surface, the first prism refracting surface and the first prism reflecting surface formed at an included angle with respect to each other, and a first prism bisecting angle formed between adjacent prisms of the plurality of first prisms;
a plurality of second prisms, each of the second prisms having a second prism refracting surface and a second prism reflecting surface, the second prism refracting surface and the second prism reflecting surface formed at the included angle with respect to each other, and a second prisms bisecting angle, different from the first prisms bisecting angle, formed between adjacent prisms of the plurality of second prisms; and
a second surface opposing the first surface. - View Dependent Claims (4, 5, 6, 7)
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8. An optical turning film comprising:
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a first surface;
an array of prisms formed in the first surface, wherein the array of prisms comprises;
a plurality of first prisms, each of the first prisms having a first prism configuration, and a plurality of second prisms, each of the second prisms having a second prism configuration different from the first prism configuration;
a second surface opposing the first surface; and
wherein light rays incident to said first surface are refracted and reflected by the plurality of first prisms and the plurality of second prisms along a preferred viewing axis and wherein the first prism configuration includes a first prisms angular orientation with respect to the first surface and the second prism angular configuration includes a second prisms angular orientation, different than the first prisms angular orientation, with respect to the first surface. - View Dependent Claims (9, 10, 11, 12)
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13. A backlight comprising:
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a lightguide having an input surface and an output surface;
a light source disposed in relation to the input surface to introduce light rays into the lightguide via the input surface;
a turning film with a first surface and a second surface and an array of prisms formed in the first surface, the turning film disposed with the first surface dispose in relation to the output surface of the lightguide such that light rays exiting the output surface of the lightguide encounter the array or prisms and are reflected and refracted by the array of prisms such that the light rays exit the turning film via the second surface and substantially along a desired angular direction; and
wherein the array of prisms includes a first plurality of prisms, each of the first plurality of prisms having a first prism configuration, and a second plurality of prisms each having a second prism configuration, different than the first prism configuration, the first prism configuration and the second prism configuration being such the light rays exiting the second surface correspond to a substantially uniform sampling of the light rays entering the lightguide at the input surface. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of reducing non-uniformities in an output of a backlight system, the backlight system including a lightguide with an input surface and an output surface, a light source arranged to introduce light rays into the lightguide via the input surface and wherein the light rays exit the lightguide via the output surface at a glancing angle thereto, the method comprising:
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configuring a turning film with an array of prisms structures in a first surface thereof, the array of prisms comprising first prisms having a first prism configuration and second prisms having a second prism configuration, different from the first prisms configuration, such that an output from a second surface of the turning film is a substantially uniform sampling of the input surface of the lightguide; and
disposing the turning film within the backlight system with the first surface of the turning film adjacent the output surface of the lightguide. - View Dependent Claims (25, 26, 27, 28)
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Specification