Direct Back-Lit Light Guide Structure, Light Guide Plate And Back-Lit Module

摘要

A direct back-lit light guide structure is applied to a light guide plate and a back-lit module. The light guide plate has a light-ejection surface and a light-inject surface opposite to the light-ejection surface. The back-lit module comprises at least one point-light source located on the light-ejection surface. The direct back-lit light guide structure comprises at least one asymmetric concave structure formed on the light-ejection surface, and each the point-light source is corresponding to one asymmetric concave structure in such a manner that the point-light source projects light directly toward the asymmetric concave structure. Each the asymmetric concave structure has a central lowest point. The point-light source is located right below the central lowest point. The direct back-lit light guide structure has advantages of better optical uniformity, higher illumination efficiency, fewer point-light sources required, lower cost, narrower side-frame and thinner light guide plate.

主权项

1. A direct light guide structure, applied to a light guide plate of a direct back-lit module, the light guide plate having a light-ejection surface and a light-inject surface opposing to the light-ejection surface, an orthogonal X-Y-Z coordinate system being defined with the light guide plate, a thickness of the light guide plate being extended in a Z direction, an X direction and a Y direction extending on the light-inject surface, the back-lit module having at least one point-light source located aside to the light-inject surface, the direct light guide structure comprising:
at least one concave structure, located on the light-ejection surface of the light guide plate, each of the at least one point-light source being disposed corresponding to the at least one concave structure so as to have a light ray emitted by the at least one point-light source to irradiate the at least one concave structure; wherein each of the at least one concave structure has a central lowest point located at a place right above the corresponding at least one point-light source, and the central lowest point and the light-ejection surface are connected by continuous configurations.