Daylight redirecting window film laminates

A daylight redirecting window film laminate having a layered structure with a total thickness of less than one millimeter, comprising:

• a first optical film having a generally smooth light input surface and an opposing generally smooth light output surface;
• a first optically transmissive adhesive layer coextensive with and bonded to the generally smooth light input surface;
• a second optically transmissive adhesive layer coextensive with and bonded to the generally smooth light output surface;
• a second optical film coextensive with the first optical film and having a light input surface facing the first optical film and an opposing textured light output surface facing away from the first optical film, the textured light output surface comprising a plurality of light scattering surface microstructures;
• and
• a parallel array of channels formed in the light input surface of the second optical film and each individual one of the parallel array of channels having an average width which is less than 50 micrometers and less than a depth of the individual one of the parallel array of channels,
• wherein the parallel array of channels defines a linear array of optically transmissive structures protruding transversely towards the first optical film and each having a first wall, an opposing second wall and a third wall joining the first and second walls, wherein the third wall is bonded to the second optically transmissive adhesive layer, and wherein at least one of the first and second walls is configured to reflect light using a total internal reflection.

A daylight redirecting window film laminate having a layered structure with a total thickness of less than one millimeter, comprising:

• a first optically transmissive film substrate;
• a first optically transmissive adhesive layer coextensive with and adhered to a first broad-area surface of the first optically transmissive film substrate;
• a second optically transmissive adhesive layer coextensive with and adhered to an opposing second broad-area surface of the first optically transmissive film substrate;
• a second optically transmissive film substrate disposed parallel to the first optically transmissive film substrate;
• a light redirecting optical layer disposed between and coextensive with the first and second optically transmissive film substrates;
• a parallel array of channels formed within the light redirecting optical layer and longitudinally extending from a first edge to an opposite second edge of the layered structure, each individual one of the channels having an average width which is less than 50 micrometers and less than a depth of the individual one of the channels;
• and
• a plurality of light scattering surface microstructures formed in a broad-area surface of the second optically transmissive film substrate which is facing away from the light redirecting optical layer,
• wherein the parallel array of channels defines a plurality of total internal reflection surfaces and a plurality of optically transmissive structures protruding transversely through at least a partial thickness of the light redirecting optical layer and each having a first wall, an opposing second wall and a third wall joining the first and second walls, and wherein a terminal end of each of the optically transmissive structure associated with the third wall is bonded to the second optically transmissive adhesive layer.