Light diffusion film, plane light source device and liquid crystal display apparatus for enhancing a constant luminance and diffusing a light
US6917396B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2002 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | May 30, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A transmissive display apparatus comprises a liquid crystal display unit; and a plane light source unit that comprises a tubular light source, a light guide, and a light-diffusing film having anisotropy that provides a consistent luminance in a display surface, and/or ultraviolet (UV) absorbability that absorbs the UV from the light source and prevents deterioration of a prism sheet in the display unit and liquid display cell. In the film, a light-scattering characteristic F(θ) represents a relationship between the light-scattering angle θ and a scattered light intensity F fulfills Fy(θ)/Fx(θ)≧1.01 over a range of θ=4 to 30°, wherein Fx(θ) and Fy(θ) represent the light-scattering characteristics in an X-axial direction and Y-axial direction of the film, respectively. The film comprises a light-diffusing layer composed of a plurality of resins which are different from each other in refractive index, and a transparent layer laminated on at least one side thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.