Light diffusion film, method of specifying surface shape of light diffusion film, and recording medium on which surface shape specification program is recorded
US9296162B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 23, 2012 |
| Grant date | Mar 29, 2016 |
| Priority date | — |
| Expiry date | Jan 8, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133606
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention solves glare of an embossed matte film of a conventional product produced and sold by the applicant of the present application, and provides a light diffusion film and the like having a surface shape of an irregular pattern that significantly suppresses the glare even when an LED light source is used and also maintains the good optical characteristics. The following is believed sufficient for maintaining good optical characteristics of an embossed matte film and also for solving the glare. To maintain the optical characteristics, the surface shape was defined by use of an inclination angle histogram profile of an embossed surface. In order to solve the glare, the size of unit patterns which make up an entire pattern and do not cause glare was defined by use of the value of the average length RSm of the roughness curve element of the embossed surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.