Film-based lightguide with interior light directing edges in a light mixing region

A film-based lightguide comprising:

• a film including a body having lateral edges opposing each other in a width direction, a first surface, and a second surface opposing the first surface in a thickness direction of the film orthogonal to the width direction;
• a light emitting region of the film defined by a plurality of light extracting features;
• a plurality of coupling lightguide strips extending from the body of the film and folded and stacked such that ends of the plurality of coupling lightguide strips form a light input surface;
• and
• a light mixing region of the film positioned along the film between the plurality of coupling lightguide strips and the light emitting region, the light mixing region has a maximum width in the width direction and comprises a plurality of interior light directing edges positioned between the lateral edges of the body of the film, wherein the plurality of coupling lightguide strips have a total width in the width direction at the light mixing region, the total width of the plurality of coupling lightguide strips at the light mixing region is less than 0.9 times the maximum width of the light mixing region in the width direction, and pairs of the plurality of interior light directing edges define a plurality of channels that totally internally reflect light propagating therein.

A film-based lightguide comprising:

• a film including a lightguide region and lateral edges opposing each other in a width direction, a first surface, and a second surface opposing the first surface in a thickness direction of the film orthogonal to the width direction, the lightguide region comprising a light emitting region defined by a plurality of light extracting features and a light mixing region;
• and
• a plurality of coupling lightguide strips extending from the lightguide region of the film,
• wherein the light mixing region of the film is positioned along the film between the plurality of coupling lightguide strips and the light emitting region, the light mixing region comprises a plurality of interior light directing edges positioned between the lateral edges of the film, and the interior light directing edges totally internally reflect light propagating in the light mixing region and redistribute light flux propagating within the lightguide region.