| CPC G02F 1/133607 (2021.01) [G02F 1/133603 (2013.01)] | 16 Claims |
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1. A diffusion plate capable of being assembled to a backlight module; said backlight module comprising a substrate and a plurality of light-emitting elements arranged in an array on the substrate; said diffusion plate being located above the substrate and comprising:
a plate body; said plate body having an upper surface and a lower surface;
a plurality of pyramid-like structures, arranged in an array on the upper surface of the plate body;
wherein, each said pyramid-like structure comprises:
a bottom surface, the bottom surface has N vertices and N bottom edges; wherein N is an integer not less than three;
a first convex portion, said first convex portion protrudes upward from the bottom surface by a first height; the first convex portion includes N first side-edges extending obliquely upward from the N vertices of the bottom surface, respectively; the N first side-edges of the first convex portion are not only equal in length but also extend upward at a same first inclination angle; and
a second convex portion, protrudes upward from a top of the first convex portion to a second height; the second convex portion includes N second side-edges extending obliquely upward from top-ends of the N first side-edges of the first convex portion; the N second side-edges of the second convex portion are not only equal in length but also extend upward at a same second inclination angle;
wherein, the first inclination angle refers to the included angle between the first side-edge and the bottom surface; the second inclination angle refers to the included angle between the second side-edge and the bottom surface; both the first inclination angle and the second inclination angle are less than 90°; the first inclination angle is not equal to the second inclination angle;
wherein, the light-emitting elements comprises a first light-emitting element; the first light-emitting element is substantially located below a center point of the bottom surface of one of the pyramid-like structures corresponding to the first light-emitting element, and emits light substantially upward toward the corresponding pyramid-like structure;
wherein, the first convex portion of the corresponding pyramid-like structure has N first side-faces formed by said N first side-edges; each said first side-face is able to refract the light emitted by the first light-emitting element and thereby generate a first light-splitting point corresponding to the first light-emitting element; in addition, the second convex portion of the corresponding pyramid-like structure has N second side-faces formed by said N second side-edges; each said second side-face is able to refract the light emitted by the first light-emitting element and thereby generate a second light-splitting point corresponding to the first light-emitting element; and thereby, the light emitted by the first light-emitting element can be refracted by the corresponding pyramid-like structure into two times of N light-splitting points;
wherein, a material of the diffusion plate includes at least one of the following: polycarbonate (PC), polystyrene (PS), polymethyl methacrylate (PMMA), polypropylene (PP), or a Copolymer of any aforementioned material.
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