초록 ▼

A plurality of microstructures is provided, with each microstructure having at least a first side and at least a second side terminating at a peak. At least some of the peaks can include an elevated portion to space the peaks away from adjacent optical sheets, surfaces, films, substrates, or other l

A plurality of microstructures is provided, with each microstructure having at least a first side and at least a second side terminating at a peak. At least some of the peaks can include an elevated portion to space the peaks away from adjacent optical sheets, surfaces, films, substrates, or other layers to minimize wet-out, Newton's rings, abrasions, moir�� fringes, or other undesirable optical conditions. In other embodiments, an optical film is also provided that includes a first plurality of microstructures having a base, a first side, and a second side, and a second plurality of microstructures having a base, a first side, and a second side, the first side including a first planar surface, and the second side including a second planar surface and a third planar surface.

대표청구항 ▼

What is claimed is: 1. An optical film for enhancing the brightness of light produced by a light source, said optical film having a first face and a second face, the first face comprising at least one plurality of prisms having a first side and a second side terminating at a peak, said plurality of

What is claimed is: 1. An optical film for enhancing the brightness of light produced by a light source, said optical film having a first face and a second face, the first face comprising at least one plurality of prisms having a first side and a second side terminating at a peak, said plurality of prisms having a first uniform set of pitch, height, angle at the peak, and side length, and further wherein at least some of the peaks include elevated portions extending above the peaks. 2. The optical film of claim 1, wherein the optical film redirects light in a collimating fashion. 3. The optical film of claim 1, wherein the elevated portions extend above the peaks to space an adjacent surface away from the peaks to reduce visible defects. 4. The optical film of claim 3, wherein the elevated portions space the adjacent surface away from the peaks by at least about 0.3 micrometers. 5. The optical film claim 1, wherein the optical film forms a part of a rear-projection screen, a computer display or monitor, an overhead projection display, or a liquid crystal display. 6. The optical film of claim 1, wherein the second face of the optical film includes the microstructures that have a series of base planes and a series of plateaus at a window side of the microstructures, the base planes and the plateaus running along a first axis, the plateaus and base planes alternating along a second axis, the plateaus not being coplanar with the base planes. 7. The optical film of claim 6, wherein at least some of the plateaus include an elevated portion extending above the plateaus. 8. The optical film of claim 1, wherein the second face of the optical film includes the microstructures selected from linear prisms, prisms, pyramids, truncated pyramids, lenticulars, cones, moth-eye structured surfaces, diffractive structures, diffractive structured surfaces, textured surfaces, lenses, base planes and plateaus, or lens arrays. 9. The optical film of claim 1, further comprising a microstructure pattern provided on second face of the optical film. 10. The optical film of claim 9, wherein at least some areas of the second face include an elevated portion extending above the second face. 11. The optical film claim 1, wherein a differentially-cured pattern is formed on and/or within the second face of the optical film. 12. The optical film of claim 11, wherein the pattern is formed by placing a mask over the second face of the optical film, the mask including opaque areas and transparent areas, and curing the optical film with a radiation source, wherein the opaque areas block the radiation to cause the area of the second face of the optical film underneath the opaque areas to be cured at a different amount of time or rate than the area underneath the transparent areas, resulting in the pattern. 13. The optical film of claim 1, further comprising a moth-eye structured surface provided on second face of the optical film. 14. The optical film of claim 13, wherein at least some areas of the window side include an elevated portion extending above the window side. 15. The optical film of claim 1, wherein the plurality of prisms have an included angle of between about 60 and 120 degrees. 16. The optical film of claim 1, wherein the elevated portions space the optical film away from an adjacent film, surface, or structure. 17. The optical film of claim 16, wherein the adjacent film, surface, or structure includes at least one of a light-redirecting film, collimating film, abrasion reduction layer, light guide, polarizing structure, or a diffuser. 18. An optical film for enhancing the brightness of light produced by a light source, said optical film having a first face and a second face, the first face comprising: at least a first plurality of prisms, said first plurality of prisms having a first set of pitch, height, angle at the peak, and side length; at least a second plurality of prisms, said second plurality of prisms having a second set of pitch, height, angle at the peak, and side length, wherein at least one of the values of pitch, height, angle at the peak, or side length of the first set is different from the corresponding value in the second set, and further wherein the prisms of the first plurality and the prisms of the second plurality are grouped in zones that periodically alternate along the film. 19. The optical film of claim 18, wherein at least some of the peaks include elevated portions extending above the peaks.