Light conductive plate and plane illuminating apparatus using the same
AssigneeColcoat Co., Ltd.
InventorsYasuhiro Asada, Kiichi Emori
Life of this patent
Estimating the term…
Abstract
A light conductive plate used in a side light source type plane illuminating apparatus having a light source arranged on one side portion of a transparent light conductive plate, has a dimming pattern composed of a plurality of curves provided on the back of said light conductive plate. Portions of each of the curves of the dimming pattern located nearer the edge near a light source extend substantially perpendicular to the edge and portions of each of the curves of the dimming pattern located farther from the edge near a light source extend substantially parallel to the edge.
Claims13
A light conductive plate in an illuminating apparatus having a light source arranged at a side portion of a transparent light conductive plate, comprising:
- a light conductive plate part having an edge adjacent a light source of an illuminating apparatus;
- a dimming pattern composed of a plurality of curves provided on one surface of said light conductive plate part, wherein portions of each of said curves of said dimming pattern located nearer said edge near a light source extend substantially perpendicular to said edge and portions of each of said curves of said dimming pattern located farther from the edge near a light source extend substantially parallel to said edge.
A light conductive plate in an illuminating apparatus having a light source arranged at a side portion of a transparent light conductive plate, comprising:
- a light conductive plate part having an edge adjacent a light source of an illuminating apparatus;
- a dimming pattern composed of a plurality of curves provided on one surface of said light conductive plate part, wherein said dimming pattern is composed of a plurality of intersecting curves having center points or origin points which are substantially equally spaced along a straight line or a circle, wherein a number of points of intersection of said curves increases with distance away from said edge.
A side light source type plane illuminating apparatus comprising:
- a light source;
- a light conductive plate having an edge adjacent the light source;
- a dimming pattern composed of a plurality of curves provided on one surface of said light conductive plate, wherein the dimming pattern curve is composed of one of printing, a concave portion and a convex portion, and wherein said dimming pattern is composed of a plurality of intersecting curves having center points or origin points which are substantially equally spaced along a straight line or a circle, wherein a number of points of intersection of said curves increases with distance away from said edge.
A liquid crystal image display device comprising:
- a liquid crystal display panel;
- a light source;
- a light conductive plate positioned for illuminating said liquid crystal display panel from a back thereof and having an edge adjacent the light source;
- a dimming pattern composed of a plurality of curves provided on one surface of said light conductive plate, wherein the dimming pattern curve is composed of one of printing, a concave portion and a convex portion, and wherein said dimming pattern is composed of a plurality of intersecting curves having center points or origin points which are substantially equally spaced along a straight line or a circle, wherein a number of points of intersection of said curves increases with distance away from said edge;
- a light diffusing plate arranged between said liquid crystal display panel and said light conductive plate, said dimming pattern being formed on a surface of said light conductive plate opposite said light diffusing plate;
- and
- a light reflecting surface on said surface of said light conductive plate opposite said light diffusing plate.
Dependencies are inferred from the claim text.