Light adjusting sheet for a planar lighting device and a...

G - Physics – 02 – B

Patent

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G02B 5/02 (2006.01) F21V 5/04 (2006.01) F21V 8/00 (2006.01) G02F 1/1335 (2006.01)

Patent

CA 2088113

A light adjusting sheet for a planar lighting device includes a plurality of convex and concave streaks arranged alternately and approximately parallel to each other on one surface. The streaks may have a cross section of a sine curve. Another light adjusting sheet consists of a plurality of single sheets each having the above configuration, stacked together. A planar lighting device includes the light adjusting sheet of the above configuration, wherein peak lines of the convex streaks and bottom lines of the concave streaks are arranged to make a predetermined angle with an axis of a linear light source. The liquid crystal display includes a liquid crystal display element placed on front of the planar lighting device of the above configuration.

Cette invention concerne une feuille de réglage de l'éclairement pour dispositif d'éclairage plan qui comprend sur une face une série de crêtes et de creux alternés et à peu près parallèles. Les crêtes et creux peuvent présenter une forme sinusoïdale. Une autre feuille de réglage de l'éclairement se compose d'une série de feuilles empilées ayant toutes la configuration ci-dessus où l'axe de symétrie longitudinale des crêtes et des creux fait un angle prédéterminé avec un axe d'une source lumineuse linéaire. L'afficheur à cristaux liquides comprend un élément d'affichage à cristaux liquides placé sur le devant du dispositif d'éclairage plan selon la configuration ci-dessus.

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