Bright View Technologies Corporation

General Electric Company

Ge Medical Systems Global Technology Company, LLC

Other

Research Triangle Institute

Nextreme Thermal Solutions, Inc.

Bing A Shen

Kenneth L Walker

Ken G Purchase

Thomas Alan Rinehart

Matthew K Pope

John W Wilson

David Michael Hoffman

Thomas L Toth

Jennifer Aspell

Rama Venkatasubramanian

Cynthia Watkins

Jiang Hsieh

George E Possin

Steven Jude Duclos

Hui David He

Jayesh Bharathan

David Alan Koester

Matthew Aaron Halsmer

Pratima V Addepalli

Robert C Hendry

Gregory Scott Zeman

Randall G Alley

Erdogan O Gurmen

O Erdogan Gurmen

Aziz Ikhlef

Tyler Justin Sprenger

Christopher B McLaurin

Gurmen O Erdogan

A light transmissive substrate that transforms light having a Lambertian distribution includes a substrate having a plurality of microstructures on a first surface, where each of the plurality of microstructures comprises an array of folded micro-pyramid microstructures, wherein each folded micro-pyramid microstructure comprises a base section with a roof angle and a recess being formed in a shape of a micro-pyramid and comprising a recess roof angle, wherein light having a Lambertian distribution that enters the first surface of the substrate is transformed into light having a distribution with a maximum intensity at an angle away from nadir and a minimum intensity at nadir that exits a second surface of the substrate.

Microstructures for transforming light having lambertian distribution into batwing distributions

An edge-lit back light unit includes a specular reflector and an edge-lit light guide film positioned above the specular reflector, both configured to provide peak optical distribution and FWHM angle of diffusion along a light propagation direction. A diffuser film above the edge-lit light guide film has a bottom-side that faces the edge-lit light guide film and a top-side that faces away from the edge-lit light guide film, and has a plurality of parallel prism microstructures on the bottom-side, some have an apex direction that is generally along the light propagation direction. The diffuser film has a plurality of parallel prism microstructures on the top-side having an apex direction that is rotated with respect to the apex direction of the plurality of parallel prism microstructures on the bottom-side such that the apex direction of the parallel prism microstructures on the top-side is generally perpendicular to the light propagation direction. A pair of crossed BEFs above the diffuser film have a plurality of parallel prism microstructures on one side and face away from the diffuser film, wherein the plurality of parallel micro prisms of one of the BEFs is oriented perpendicular to the plurality of micro prisms of the other BEF. The apex direction of the plurality of parallel prism microstructures on the bottom side of the diffuser film is substantially aligned with the plurality of parallel micro prisms of at least one of the brightness enhancement films.

Edge-lit back light unit using prism microstructures

A light transmissive substrate for transforming a Lambertian light distribution into a batwing light distribution. The light transmissive substrate includes a first surface comprising a plurality of microstructures, and a second surface on a side of the substrate opposite the first surface. The substrate is configured to receive light in a Lambertian distribution from a light source at the first surface and transform the light into a batwing distribution exiting the second surface. The batwing distribution having a peak intensity at about ±30° to about ±60° from X and Y axes, and a minimum intensity at nadir.

Microstructures for transforming light having Lambertian distribution into batwing distributions

An edge-lit back light unit for a backlit display includes a reflector, an edge-lit light guide film, a diffuser film, and a pair of crossed brightness enhancement films with increased efficiency. The diffuser film has an angular light distribution output that is matched to light acceptance angles of the pair of crossed brightness enhancement films to provide increased on-axis brightness without having to increase power to the edge-lit back light unit.

Edge-lit back light unit with improved efficiency

An optical film for a back light unit that includes an array of light emitting diodes. The optical film includes a substrate, and a plurality of regions of spatially modulated microstructures on at least one side of the substrate. The spatially modulated microstructures have different sizes and/or shapes configured to create a gradient structure within each region. The gradient structure within each region is constructed and arranged to cause more spreading of light when positioned directly above an individual light emitting diode and less spreading of light at locations not directly above an individual light emitting diode. Within the back light unit, the gradient structure converts light beams emitted by the respective light emitting diode at different angles into a more uniform and higher on-axis luminance upon exiting the back light unit.

Optical film for back light unit and back light unit including same

A light transmissive structure includes a light transmissive substrate having first and second opposing faces, and an array of microprism elements on the first face. Each microprism element includes a first inclined surface disposed at a first inclined angle relative to the second face, and a second inclined surface disposed at a second inclined angle relative to the second face. The first inclined angle is less than the second inclined angle, and a peak angle between the first inclined surface and second inclined surface is in the range of about 70 degrees to about 100 degrees. The second inclined surface has a convex curvature when viewed from angles perpendicular thereto. The light transmissive structure is configured to receive light from a light source facing the first face in a first direction and redistribute light emerging from the second face in a second direction different from the first direction.

Light transmissive structures for redistribution of light and lighting systems including same

A back light unit includes an array of LEDs positioned in rows and columns that emit light from a top surface. A light splitting optical film includes a plurality of inverted pyramids positioned on a first side facing the top surface of the array where each of the plurality of inverted pyramids forms an apex oriented in a direction away from the top surface of the array. A plurality of linear prisms is positioned in a parallel configuration on a second side facing away from the top surface of the array where at least some of the linear prisms form an apex being oriented such that a direction of the apex forms a desired angle with respect to a direction of a row of the array of light emitting diodes.

Back light unit for backlit displays

A light transmissive substrate for transforming a Lambertian light distribution into a batwing light distribution. The light transmissive substrate includes a first surface comprising a plurality of microstructures, and a second surface on a side of the substrate opposite the first surface. The substrate is configured to receive light in a Lambertian distribution from a light source at the first surface and transform the light into a batwing distribution exiting the second surface. The batwing distribution having a peak intensity at about &#xb1;30&#xb0; to about &#xb1;60&#xb0; from X and Y axes, and a minimum intensity at nadir.

A back light unit includes an array of light emitting diodes, at least two optical films positioned above the array of light emitting diodes, and a pair of brightness enhancement films positioned above the at least two optical films. A majority of the optical films are light splitting optical films having a plurality of light splitting microstructures on at least one surface thereof.

A light transmissive substrate for transforming a Lambertian light distribution includes a base film having a first side and a second side opposite the first side, a plurality of first microstructures disposed on the first side of the base film and a plurality of first valleys. Each of the first valleys is defined by a pair of adjacent first microstructures. A filler material is disposed in the plurality of first valleys and defines a substantially planar surface spaced from and substantially parallel to the first side of the base film. The substrate also includes a plurality of second microstructures disposed on the substantially planar surface of the filler material and a plurality of second valleys. Each of the second valleys is defined by a pair of adjacent second microstructures.

Vertically integrated transmissive microstructures for transforming light having Lambertian distribution

Growing community of inventors

Durham, NC, United States of America

Bing A Shen