Optical substrates having light collimating and diffusion structures

An optical film, comprising:

• a substrate having a light input surface and a light output surface opposite to the light input surface;
• a prismatic structure disposed on the light output surface of the substrate, wherein the prismatic structure comprises a plurality of prisms extending in a first direction;
• and
• a lenticular structure disposed on the light input surface of the substrate, wherein the lenticular structure comprises a plurality of lenticular segments each of which is non-cylindrical, wherein the overall light input surface of the substrate has no lenticular segment extending from a first edge of the light input surface to a second edge of the light input surface opposite to the first edge of the light input surface thereon, wherein each of the plurality of lenticular segments has a largest dimension in a second direction, wherein the first direction and the second direction are substantially parallel.

An optical film, comprising:

• a substrate having a light input surface and a light output surface opposite to the light input surface;
• a prismatic structure disposed on the light output surface of the substrate, wherein the prismatic structure comprises a plurality of prisms extending in a first direction;
• and
• a lenticular structure disposed on the light input surface of the substrate, wherein the lenticular structure comprises a plurality of lenticular segments, wherein at least two lenticular segments overlap each other, wherein the overall light input surface of the substrate has no lenticular segment extending from a first edge of the light input surface to a second edge of the light input surface opposite to the first edge of the light input surface thereon, wherein each of the plurality of lenticular segments has a largest dimension in a second direction, wherein the first direction and the second direction are substantially parallel.