Multi-function composite optical film

An optical film having a structured light input surface and a light output surface opposite to the structured light input surface, comprising:

• a substrate having a first surface and a second surface opposite to the first surface, wherein the first surface of the substrate defines the light output surface of the optical film;
• and
• a structured layer having a third surface and a fourth surface opposite to the third surface, wherein the third surface of the structured layer is on the second surface of the substrate and the fourth surface of the structured layer defines the structured light input surface of the optical film;
• wherein the fourth surface of the structured layer comprises a plurality of prisms, wherein each of the plurality of prisms extends substantially along a first direction, wherein each of the plurality of prisms has a height relative to the second surface of the substrate, wherein the height of each of at least one of the plurality of prisms varies along the first direction.

An optical film having a structured light input surface and a light output surface opposite to the structured light input surface, comprising:

• a substrate having a first surface and a second surface opposite to the first surface, wherein the first surface of the substrate defines the light output surface of the optical film;
• and
• a structured layer having a third surface and a fourth surface opposite to the third surface, wherein the third surface of the structured layer is on the second surface of the substrate and the fourth surface of the structured layer defines the structured light input surface of the optical film;
• wherein the fourth surface of the structured layer comprises a plurality of prisms, wherein each of the plurality of prisms extends continuously along a first direction and has a pair of faces intersecting to form a ridge, wherein the plurality of prisms are disposed along a second direction substantially perpendicular to the first direction, wherein the ridge of each of the plurality of prisms has a height relative to the second surface of the substrate, wherein the height of each of the plurality of prisms varies along the first direction.