Light guide plate, light guide plate unit, and planar...

Details Light guide plate, light guide plate unit, and planar... Light guide plate, light guide plate unit, and planar...

2011-01-11

2011-01-11

O Shea, Sandra L (Department: 2875)

Illumination

Edge lighted panel

Light guide

C362S615000, C349S065000

Reexamination Certificate

active

07866872

ABSTRACT:
The light guide plate includes a light exit plane, two light entrance planes, two symmetrical inclined rear planes increasingly distanced from the light exit plane from the two light entrance planes toward a center of the light exit plane, a curved portion joining the two inclined rear planes and scattering particles for scattering light travelling inside the light guide plate. The light guide plate satisfies given ranges set for a length between the two light entrance planes, a thickness of each of the two light entrance planes, a thickness at the center of the curved portion, a radius of curvature thereof, tapers of the inclined rear planes, and a particle diameter and a density of the scattering particles, and conditions that a light use efficiency be 55% or greater and that a middle-high ratio represented by the brightness distribution at the light exit plane be greater than 0% and not greater than 25%.

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