| 摘要 |
The present invention provides an optical sheet having a plurality of light guide plate patterns, each light guide plate pattern having a micro-patterned output surface for emitting light, and a micro-patterned bottom surface opposing to the output surface, made in steps comprising: extruding a first resin into the nip between a first pressure roller and a first patterned roller to form a first layer at a first patterned roller surface temperature T1 and a first nip pressure P1, the first layer having an unpatterned surface and a patterned surface, the patterned surface having a micro-pattern transferred from the first patterned roller, and conveying the first layer into a nip between a second patterned roller and a second pressure roller in a second extrusion station; and extruding a second resin into the nip between the second pressure roller and the second patterned roller and onto the unpatterned surface of the first layer to form a second layer at a second patterned roller surface temperature T2 and a second nip pressure P2, the second layer having a micro-pattern transferred from the second patterned roller; the combined first and second layers forming the optical sheet comprising the plurality of light guide plate patterns.
|
