Patent ID: 11906842
Assignee: BRIGHTVIEW TECHNOLOGIES, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 24:
25. A back light unit comprising:
a) an array of light emitting diodes; and
b) an optical film positioned above the array of light emitting diodes, the optical film comprising:
i) a substrate;
ii) a plurality of first regions of spatially modulated microstructures on at least one side of the substrate, the spatially modulated microstructures having different sizes and/or shapes configured to create a gradient structure within each first region, each of the plurality of first regions being substantially circular in shape in plan-view, wherein a center of at least one of the plurality of first regions is positioned directly over a light emitting diode comprising the array of light emitting diodes, the gradient structure within each first region being constructed and arranged to cause a first level of spreading of light when positioned directly above an individual light emitting diode and a second level of spreading of light at locations not directly above an individual light emitting diode, the second level being less that the first level;
iii) a plurality of second regions of spatially modulated microstructures on the at least one side of the substrate; and
iv) a plurality of third regions of spatially modulated microstructures on a side of the substrate that is different from the at least one side of the substrate.