| 主权项 |
1. A backlight module, comprising:
light sources; a light guide plate including a light-incident surface and hollow structures disposed therein, wherein the light sources are close to the light-incident surface of the light guide plate, and each of the hollow structures corresponds to one of the light sources and comprises two air layers with an included angle there-between, and the two air layers are a first hollow layer and a second hollow layer; wherein a normal direction is vertical to the light-incident surface, and there is a first oblique angle between the first hollow layer and the normal direction, and there is a second oblique angle between the second hollow layer and the normal direction; wherein the first oblique angle β 1 satisfies the below equation:
β 1 <45°-θ LGP /2; wherein the second oblique angle β 2 satisfies the below equation:
β 2 <45°-θ LGP /2; wherein θ LGP indicates a refraction angle of light rays which are emitted into the light guide plate along the normal direction; wherein the hollow structures have a hollow depth D along a thickness direction of the light guide plate, and there is a minimum distance L between the hollow structures and a light-mixing line of the backlight module, and the light rays have a minimum refraction angle δ on the light-mixing line, and the hollow depth D, the minimum distance L and the minimum refraction angle δ satisfy the below equation:
sin δ≦nLGP×sin (a tan (L/D)); wherein nLGP indicates a refractive index of the light guide plate, and the thickness direction is parallel to the light-incident surface, and at the light-mixing line in the light guide plate, the light rays of the adjacent light sources are mixed, and the hollow depth D is a depth of the hollow structures in the light guide plate. |
