Illumination apparatus and film

A light extracting film having an input surface for being optically coupled with the top surface of a light guide and an output surface for providing light, wherein the input surface comprises a plurality of light extracting features, each light extracting feature comprising:

• (i) a first side comprising two or more planar segments;
• and
• (ii) a second side comprising two or more planar segments,
• wherein the first and second sides intersect at an apex, and at least two of the light extracting features have lengths that are much smaller than the dimension of the light extracting film measured in the same direction.

A display apparatus comprising:

• (a) at least one light source;
• (b) a light guide for accepting light from the at least one light source and for guiding the light using total internal reflection, the light guide having a top surface;
• (c) a light extracting film having an input surface optically coupled with the top surface and an output surface for providing light;
• and
• (d) a light gating device for modulating the light to form an image thereby,
• wherein the input surface comprises a plurality of light extracting features which are optically coupled to the top surface of the light guide, each light extracting feature having:
• (i) a first side comprising two or more planar segments;
• and
• (ii) a second side comprising two or more planar segments, and wherein the first and second sides intersect at an apex.

An illumination apparatus comprising:

• (a) at least one light source;
• (b) a light guide for accepting light from the at least one light source and for guiding the light using total internal reflection;
• (c) a light extracting film having an input surface optically coupled with the light guide and an output surface parallel to the input surface for providing light,
• wherein the input surface comprises a plurality of light extracting features which are optically coupled to the light guide, such features being extended in a longitudinal direction and having a cross section in the plane perpendicular to the longitudinal direction, the cross section comprising
• (i) a first side comprising at least two but not more than six linear segments, and
• (ii) a second side comprising at least two but not more than six linear segments,
• wherein at least one of the plurality of light extracting features has a length measured in the longitudinal direction that is less than the length of the light extracting film measured in the longitudinal direction.