Optical substrates having light collimating and diffusion structures
US10725330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2018 |
| Grant date | Jul 28, 2020 |
| Priority date | — |
| Expiry date | Jan 2, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133507
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention discloses a method of forming a prism sheet. The method comprises: providing a substrate having a major light input surface and a major light output surface opposite to the major light input surface; forming a prismatic structure on the major light output surface of the substrate; and forming an uneven structure on the major light input surface of the substrate, wherein forming the uneven structure on the major light input surface of the substrate comprises: providing a hard tool having a smoothly-curved shape such that the penetrating width of the hard tool increases as the penetrating depth of the hard tool increases; penetrating the hard tool into a mold and repeatedly moving the hard tool up and down to form a plurality of smoothly-curved concave shapes along a first path on the mold; and using the cut surface of the mold to emboss a thin film on the second path corresponding to the first path on the major light input surface of the substrate to form a plurality of convex shapes one-to-one corresponding to the plurality of smoothly-curved concave shapes on the second path on the major light input surface of the substrate; wherein the hard tool is not pulled away …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.