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US 2011/0032727 A1Published application
Backlight reflectors having a prismatic structure
Assignee3M Innovative Properties Company
InventorsBrian A. Kinder, Gary T. Boyd, Stephen K. Eckhardt, Chun-Yi Ting, Han-Lin Tung, Linda M. Rivard, Tao Liu
Life of this patent
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Abstract
A back reflector for a lightguide in a turning film backlight includes a prism film layer in direct contact with a reflective layer. The lightguide includes a light guiding region having a refractive index that is substantially spatially uniform. The reflective layer may be specular or diffuse and may include a multilayer polymeric film.
Claims28
A turning film backlight, comprising:
- a lightguide, a light guiding region of the lightguide having an exit surface, a back surface, and at least one input edge, the light guiding region having a substantially spatially uniform refractive index;
- at least one light source arranged to supply light to the input edge of the lightguide;
- a turning film arranged to direct light emerging from the lightguide exit surface toward an illumination field;
- a reflector disposed along the back surface of the lightguide, the reflector comprising:
- a reflective layer;
- and
- a prism layer in contact with the reflective layer, the prism layer comprising a series of substantially linear prisms.
4 more elements
A method of making a turning film backlight, comprising:
- arranging a back reflector along a back surface of a lightguide, a light guiding portion of the lightguide having a substantially spatially uniform index of refraction, the back reflector comprising a reflective layer in contact with a prism layer having rows of substantially linear prisms, the back reflector oriented so that prism peaks of the prism layer point toward the back surface of the lightguide;
- arranging a turning film along an exit surface of the lightguide;
- and
- orienting a light source to supply light into an input edge of the lightguide.
1 more element
Dependencies are inferred from the claim text.