Light diffuser for point light source and direct type point light source backlight device
US9341754B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2010 |
| Grant date | May 17, 2016 |
| Priority date | — |
| Expiry date | Feb 27, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/0278
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a direct type point light source backlight using point light sources, a light diffuser is provided that can achieve coexistence of superior luminance, luminance uniformity (front and oblique views), and a color unevenness characteristic even with a desired backlight thickness and a few number of point light sources without using a number of optical films together.Specifically, provided is a light diffuser for point light sources, the light diffuser having a plurality of convex portions formed on a surface thereof, wherein the convex portion has a substantially triangular pyramid shape whose bottom surface is a triangle, and an inclined angle θ with respect to a bottom surface of a side surface of the substantially triangular pyramid shape and a refractive index A of a material forming the convex portion satisfy the following equations (1) and (2).θ≧−40A°+115.2° (1)θ≦25A°+22.25° (2)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.