Light guide plate, method for fabricating the same and backlight unit
AssigneesBoe Technology Group Co., Ltd., Beijing Boe Display Technology Co., Ltd.
InventorsZhidan Zhang, Hongli Zhu, Daekeun Yoon, Qing Ma, Hai Chi, You Li
Life of this patent
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Abstract
Embodiments of the invention relate to a light guide plate, a method for fabricating the same and a backlight unit. The light guide plate comprises a low density region and a plurality of high density regions, wherein the plurality of high density regions are separately disposed on a light incident side of the light guide plate.
Claims9
A light guide plate, comprising:
- a low density region and a plurality of high density regions, the plurality of high density regions are disposed on a light incident side of the light guide plate and the plurality of high density regions are disposed separately from one another, the low density region is in contact with each of the plurality of high density regions, each of the plurality of high density regions forms a portion of a light incident surface of the light incident side of the light guide plate and has a tapered shape, and each of the plurality of high density regions is on the light incident surface,
- wherein the high density regions are made of polymethylmethacrylate or polycarbonate or styrene methyl methacrylate resin, the low density region is made of polymethylmethacrylate or styrene methyl methacrylate resin or polystyrene, wherein the low density region is a region having a lower material density as compared to the high density regions, wherein the material density is defined as its mass or weight per unit volume, wherein the high density regions are located in a region of the light guide plate corresponding to a region between two separate neighboring dot light sources, when a plurality of separate dot light sources are used as a side light source, wherein the high density regions are located in a triangular dark region on the light guide plate generated by two neighboring separate dot light sources.
An injection molding method for fabricating a light guide plate having regions of different material densities, wherein the regions of different material densities comprises a low density region and a plurality of high density regions, the low density region is in contact with each of the plurality of high density regions, the plurality of high density regions are disposed separately from one another, each of the plurality of high density regions forms a portion of a light incident surface of a light incident side of the light guide plate and has a tapered, and each of the plurality of high density regions is on the light incident surface, wherein a mold used in the low density region by the method is configured as a core-pulling mold , wherein the high density regions are made of polymethylmethacrylate or polycarbonate or styrene methyl methacrylate resin, the low density region is made of polymethylmethacrylate or styrene methyl methacrylate resin or polystyrene, wherein the material density is defined as its mass or weight per unit volume, wherein the high density regions are located in a region of the light guide plate corresponding to a region between two separate neighboring dot light sources, when a plurality of separate dot light sources are used as a side light source, wherein the high density regions are located in a triangular dark region on the light guide plate generated by two neighboring separate dot light sources.
Dependencies are inferred from the claim text.