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US 11,307,333 B2Granted
Asymmetric turning film with top-hat light output distributions
Assignee3M Innovative Properties Company
InventorsRobert M. Emmons, Kenneth A. Epstein
Life of this patent
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Abstract
An optical system including a light guide and a turning film that includes a first major surface, where the first major surface is substantially smooth and a second major surface including a plurality of asymmetric microstructures each respective asymmetric microstructure including a first side, where the first side is substantially planar, and a second side including a first surface segment defining a substantially planar surface and a second surface segment defining a non-planar surface.
Claims23
An optical system, comprising:
- a light guide;
- and
- a turning film, comprising:
- a first major surface, wherein the first major surface is substantially smooth;
- and
- a second major surface comprising a plurality of asymmetric microstructures each respective asymmetric microstructure, comprising:
- a first side, wherein the first side is substantially planar;
- and
- a second side, comprising:
- a first surface segment defining a substantially planar surface;
- and
- a second surface segment defining a non-planar surface,
- wherein a full width at 90% maximum relative brightness is at least 35% as wide as a full width at 20% maximum relative brightness,
- wherein an output distribution of relative brightness to down-guide angle includes a flat-top region between −15 and 5 degrees having less than 5% peak to valley variability of the output distribution.
11 more elements
Dependencies are inferred from the claim text.