Plane light source unit

G - Physics – 02 – F

Patent

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Details

G02F 1/1335 (2006.01) F21V 8/00 (2006.01)

Patent

CA 2099067

A plane light source unit which may be advantageously used as a backlighting means for a liquid crystal display device, and which comprises a transparent light guide having a side end surface as a light incident surface, a surface perpendicular to the light incident surface as a light emitting surface, and a light reflecting layer provided on an opposite surface to the light emitting surface; and a second element having a large number of prism units formed on the light emitting surface of the transparent light guide which receives the light emitted from the transparent light guide and emits the light in a predetermined direction; wherein at least one of the light emitting surface and the opposite surface of said transparent light guide has a directional light emitting function which emits the incident light from the light incident surface of the transparent light guide in an oblique direction to the incident light and has a regulation function which makes the luminance of the light through the light emitting surface uniform over the whole surface thereof.

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