Light guide plate, light guide unit arrangement structure and surface light source

Abstract

The invention discloses a light conductive plate, a light conductive unit arrangement structure and a surface light source device, wherein the light conductive plate comprises a base plate and a plurality of light conductive units on the surface of the base plate, the light conductive units are arranged along two coordinate axis at the surface of the base plate that the light conductive unit row arranged along one coordinate axis is provided with the arrangement offset towards to another coordinate axis.

Description

technical field [0001] The present invention relates to a light guide plate and its arrangement structure of light guide units, in particular to a light guide plate and its arrangement structure of light guide units applicable to point light sources or linear light sources. Background technique [0002] FIG. 1 is a schematic diagram showing a conventional design of a light guide plate with a point light source. The point light source is, for example, a light emitting diode (LED) 102 . As shown in FIG. 1 , since the radiated light wave of the point light source is a spherical wave front, the known design matches the light radiation direction of the point light source, and the light guide unit 104 on the substrate 106 is arranged in a ring along the r and θ directions of the polar coordinates. The rings are regularly arranged concentric circles, so that the light guide plate 100 can obtain better light guide efficiency (light output efficiency), and each light guide unit 104 ...

AI Technical Summary

Problems solved by technology

[0006] Furthermore, based on the configuration of the regular arrangement of multiple rings, when the known design divides the light guide plate 100 into a plurality of light guide blocks according to the light radiation direction of the point light source, it will result in two adjacent light guide blocks as shown in FIG. 1 . There is no light guide unit 104 on the boundary between the blocks (ie around the dotted line)

In this way, the light passing through the boundary area will not encounter the micro-scattering element 104 and be difficult to be led out of the light guide plate 100, so that dark lines (corresponding to the position shown by the dotted line in FIG. 1) will be formed on the light guide plate 100, which will affect the visual effect.

[0007] In addition, please refer to FIG. 1 again. It is known that the long-axis direction M of the light guide unit 104 is substantially perpendicular to the light radiation direction N of the light emitting diode (δ=90°), which will cause the light beam scattered through the light guide unit 104 to be too concentrated. The brightness of the light guide unit 104 itself is too high compared with the surroundings to form obvious bright spots, which affects the visual effect

Furthermore, when the above-mentioned vertical configuration is applied to the design in which the light guide plate 100 is divided into a plurality of light guide blocks, the density of the light guide units 104 in the light guide blocks near the light emitting diodes 102 will be too high, resulting in the uniformity of the overall luminance. The adjustment is limited

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