Backlight module and reflective cover used therein

Details Backlight module and reflective cover used therein Backlight module and reflective cover used therein

2006-10-17

2006-10-17

Ton, Toan (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

C349S064000, C362S341000, C362S609000

Reexamination Certificate

active

07123316

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:{∫π/2φ-θ⁢ρ⁡(φ)⁢sin⁡(φ-θ)⁢ⅆ(φ-θ)=∫0θ⁢1cos2⁡(θ)⁢ⅆθρ⁡(φ)=ρ0⁢{cos⁡(θ/2)/[cos⁡(φ-θ)/2]}2, 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.

REFERENCES:
patent: 5335152 (1994-08-01), Winston
patent: 2004/0027041 (2004-02-01), Nishikawa
patent: 2006/0098453 (2006-05-01), Kuo
Roland Winston and Harald Ries; “Nonimaging reflectors as functionals of the desired irradiance”; pp. 1902-1908, J. Opt. Soc. Am. A vol. 10, No. 9 Sep. 1993.

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