Backlight module and reflective cover used therein
US7123316B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 28, 2006 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Apr 28, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0038
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A backlight module (30) includes a light source (42) for emitting light, a light guide plate (50), and a reflective cover (41). The light guide plate includes a light incidence surface (51), a light-emitting surface (53) connecting with the light incidence surface, and a bottom surface (52) opposite to the light-emitting surface. The light source faces the light incidence surface. The reflective cover includes a reflective unit having two reflective surfaces (411, 412) defining a space with a bottom. The light source is accommodated in the bottom of the space. A cross-sectional profile of the reflective surfaces is defined by an equation in a polar coordinate ρ(φ). The equation is:wherein, ρ represents a polar axis of the polar coordinate, φ represents a clockwise angle of the polar coordinate, and θ represents an anti-clockwise divergence angle of the light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.