Light guides

A lightguide comprising:

• a lightguiding layer comprising a first major surface, an opposing second major surface, and a side surface, the lightguiding layer receiving light from the side surface, the received light propagating within the lightguiding layer by total internal reflection from at least the first major surface;
• a light extracting layer comprising a structured major surface facing the first major surface of the lightguiding layer, the structured major surface comprising:
• a first plurality of first optical structures, each first optical structure extracting light from the lightguiding layer;
• and
• a second plurality of second optical structures, each second optical structure not extracting light from the lightguiding layer;
• and
• an optical coupling layer adhering each first optical structure, but no second optical structure, to the first major surface of the lightguiding layer.

A lightguide comprising:

• a lightguiding layer comprising a first major surface, an opposing second major surface, and a side surface, the lightguiding layer receiving light from the side surface, the received light propagating within the lightguiding layer by total internal reflection from at least the first major surface;
• and
• a structured surface facing the first major surface of the lightguiding layer and comprising:
• a plurality of first linear optical structures, each first linear optical structure extracting light from the lightguiding layer at a plurality of first, but not second, locations, along the length of the optical structure by frustrating total internal reflection at the first locations on the first major surface of the lightguiding layer.