Patent ID: 8223335

Claim:
A system for alignment measurement for a rolling embossed double-sided optical film for forming patterns on both sides of a substrate, the system comprising: a roller unit, comprising: a first roller with a first brightness enhancement film pattern and a first alignment pattern thereon, and a second roller with a second brightness enhancement film pattern and a second alignment pattern thereon, wherein the first roller is positioned opposite to the second roller so that both sides of the substrate contact the first roller and the second roller respectively, the first brightness enhancement film pattern and the first alignment pattern form respectively a first brightness enhancement film region and a first alignment region on one side of the substrate and the second brightness enhancement film pattern and the second alignment pattern form respectively a second brightness enhancement film region and a second alignment region on the other side of the substrate, and the first brightness enhancement film region and the second brightness enhancement film region are opposite to each other, while the first alignment region and the second alignment region are not opposite to each other; a measuring unit for measuring diffraction patterns in the first alignment region and the second alignment region, respectively; and a control unit electrically connected to the roller unit and the measuring unit to adjust a relative position between the first roller and the second roller according to the diffraction patterns measured by the measuring unit.