Light-scattering film, polarizing plate and image display
US7813038B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2007 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Jul 18, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light-scattering film is provided and includes a transparent support having thereon at least a light-scattering layer. When substantially parallel light is incident on a surface of the film at an incident angle of 5°, the reflectance for an angle θ in the light-receiving part measured in a plane containing the film normal line and the incident direction is R(θ), the value obtained by normalizing R(θ) by the reflectance of regular reflection is Rrel(θ), and the value calculated from the maximum variation |dRrel(θ)/dθ|max for the angle θ is a scattering coefficient A (formula 1), the reflection coefficient B (formula 2) calculated from the scattering coefficient A and the 5° specular reflectance Rs is from 2.0 to 5.0.Scattering coefficient A=1/(10×|dRrel(θ)/dθ|max) (Formula 1)Reflection coefficient B=2.2×log 10(Rs)−7.5×log 10(A)+5.9 (Formula 2)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.