Light guide plate and backlight device

Abstract

A light guide plate 10 comprising an entry surface 11 on at least one side surface, a rectangular exit surface 12 orthogonal to the entry surface 11 and a reflecting surface 13, wherein the reflecting surface 13 has a deflection pattern that receives a ray of light incoming from the entry surface 11 or the exit surface 12 at a certain angle to the normal to the exit surface 12 and outputs the ray of light at a reduced angle to the normal, the deflection pattern has a plurality of arcuate deflection pattern elements formed on a plurality of concentric circles, the exit surface 12 has an anisotropic diffusion pattern that transmits so as to spread, a ray of light incoming from the deflection pattern at an angle up to a specified angle with respect to the normal the exit surface 12, the anisotropic diffusion pattern spreads the ray of light incoming from the deflection pattern so that the width of diffusion in a direction orthogonal to the radial direction of arcs of the concentric circles is larger than that in the radial direction, and the center of the concentric circles is positioned on any one of the side surfaces of the light guide plate 10 or in the vicinity thereof.

Description

technical field [0001] The present invention relates to a light guide plate for introducing light emitted from a light source, and a backlight device provided with the light guide plate for illuminating liquid crystal display elements and the like from the back. Background technique [0002] Conventionally, in order to illuminate liquid crystal display devices such as mobile phones, a light guide plate for guiding light emitted from a light source to the liquid crystal display device and a backlight device for illuminating the liquid crystal display device including the light guide plate from the back are provided. [0003] Figure 1A , Figure 1B And FIG. 1C is an external view showing a conventional light guide plate (for example, refer to Japanese Patent No. 3151830.). Figure 1A represents a stereogram, Figure 1B Indicates a top view. Figure 1A The light emitting diode 120 of the light source is also represented in the same time. [0004] The light guide plate 110 is...

AI Technical Summary

Problems solved by technology

[0012] In the conventional light guide plate, the ratio of the light emitted from the exit surface to the light incident from the incident surface is very small, and there is a problem in the utilization efficiency of the light emitted from the light source.

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