LIGHT REDIRECTING FILMS AND FILM SYSTEMS
First Claim
1. A light redirecting film system comprising a backlight including at least one input edge for receiving light from a light source, and at least one light output surface for emitting light, the backlight having deformities that cause most of the light entering the input edge to be emitted from the light output surface at relatively low angles, and a light redirecting film in close proximity to the light output surface for receiving light emitted from the light output surface, the light redirecting film having a pattern of individual optical elements of well-defined shape that vary at different locations on the film to redistribute the light emitted from the light output surface toward a direction normal to the film.
6 Assignments
0 Petitions
Accused Products
Abstract
Light redirecting films and film systems include a thin optically transparent substrate having a pattern of individual optical elements of well defined shape on or in the substrate. At least some of the optical elements may vary at different locations on the substrate to redistribute or redirect light passing through the substrate.
114 Citations
25 Claims
- 1. A light redirecting film system comprising a backlight including at least one input edge for receiving light from a light source, and at least one light output surface for emitting light, the backlight having deformities that cause most of the light entering the input edge to be emitted from the light output surface at relatively low angles, and a light redirecting film in close proximity to the light output surface for receiving light emitted from the light output surface, the light redirecting film having a pattern of individual optical elements of well-defined shape that vary at different locations on the film to redistribute the light emitted from the light output surface toward a direction normal to the film.
- 18. A light redirecting film system comprising a backlight including at least one input edge for receiving light from a light source, and at least one light output surface for emitting light, and a light redirecting film in close proximity to the light output surface for receiving light emitted from the light output surface, the backlight having individual optical elements that partially collimate light along one axis, and the light redirecting film having a pattern of individual optical elements of well-defined shape that partially collimate the light emitted by the backlight along another axis perpendicular to the one axis.
- 22. A light redirecting film system comprising a backlight including at least one input edge for receiving light from a light source, and at least one light output surface for emitting light, the backlight having individual optical deformities of well-defined shape for causing 60 to 70% or more of the light received through the input edge to be reflected or refracted out of the light output surface, and a light redirecting film in close proximity to the light output surface for receiving light emitted from the light output surface, the light redirecting film having a pattern of individual optical elements of well-defined shape to redistribute the light emitted by the backlight toward a direction normal to the film.
Specification
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- Resources
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Current AssigneeDelaware Display Group LLC (Acacia Research Corporation)
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Original AssigneeRambus Inc.
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InventorsMcCollum, Timothy A., Parker, Jeffery R., Ezell, Robert M.
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current362/619
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CPC Class CodesA61B 2090/309 using white LEDsA61M 2021/0044 by the sight senseA61M 21/02 for inducing sleep or relax...A61N 2005/063 comprising light transmitti...A61N 2005/0652 Arrays of diodesA61N 5/0621 Hyperbilirubinemia, jaundic...F21V 11/00 Screens not covered by grou...F21V 5/10 comprising photoluminescent...G02B 6/0018 Redirecting means on the su...G02B 6/002 by shaping at least a porti...G02B 6/0021 for housing at least a part...G02B 6/0028 Light guide, e.g. taperG02B 6/0031 Reflecting element, sheet o...G02B 6/0036 2-D arrangement of prisms, ...G02B 6/0038 Linear indentations or groo...G02B 6/0043 provided on the surface of ...G02B 6/0053 Prismatic sheet or layer; B...G02B 6/006 to produce indicia, symbols...G02B 6/0061 to provide homogeneous ligh...G02B 6/0065 Manufacturing aspects; Mate...View All
