CN-122018071-A - Light guide plate and backlight module thereof

Abstract

The invention discloses a light guide plate and a backlight module thereof, wherein the light guide plate is provided with a light incident side surface, an upper surface and a lower surface which are oppositely arranged, and the upper surface and the lower surface are respectively adjacent to the light incident side surface. The upper or lower surface is provided with a plurality of concave lattice point structures, each lattice point structure is provided with a light-facing surface and a backlight surface, the included angle between a light-facing surface line segment and a vertical line is 50-60 degrees, the included angle between a backlight surface line segment and the vertical line is 30-50 degrees, the included angle between a reference surface extending from any two point connecting lines of the edge lines of the backlight surface and the backlight surface is 10-30 degrees, and the backlight module comprises the light guide plate and an LED light bar correspondingly arranged on the light-entering side surface of the light guide plate. The brightness of the backlight module can be effectively improved through the structural angle configuration of the lattice point structure, so that the whole backlight module has higher brightness and light utilization efficiency.

Inventors

• WU JIANJUN
• Li Jiangyanting

Assignees

• 苏州茂立光电科技有限公司

Dates

Publication Date

20260512

Application Date

20260305

Claims (10)

1. 1. The utility model provides a light guide plate, has income light side, upper surface and lower surface, upper surface with the lower surface is relative setting and respectively with go into the light side is adjacent, its characterized in that: The upper surface or the lower surface of the light guide plate is provided with a plurality of lattice point structures, each lattice point structure is of a concave structure and is provided with a light-receiving surface and a backlight surface, wherein in the cross section of each lattice point structure which is perpendicular to the upper surface and the lower surface and perpendicular to the light incident side surface, an included angle between a first line segment formed by the light-receiving surface and the vertical line is 50-60 degrees, an included angle between a second line segment formed by the backlight surface and the vertical line is 30-50 degrees, and an included angle between a reference surface vertically extended from a connecting line of any two points on the edge line of the backlight surface and the backlight surface is 10-30 degrees.
2. 2. The light guide plate according to claim 1, wherein the depth of each dot structure is 5-8 μm.
3. 3. The light guide plate of claim 1, wherein each of the backlight surfaces is a cambered surface.
4. 4. A backlight module, comprising: A light guide plate according to claim 1 to 3, and The LED light bar is arranged corresponding to the light incident side surface so as to provide the side light incident ray of the light guide plate.
5. 5. The backlight module according to claim 4, further comprising a reflective sheet disposed at the bottom side of the light guide plate.
6. 6. A backlight module according to claim 5, wherein the reflective sheet has a metallic silver coating and is matte-treated.
7. 7. The backlight module according to claim 4, further comprising a diffusion sheet stacked on the top side of the light guide plate.
8. 8. The backlight module according to claim 7, further comprising a brightness enhancement structure stacked on top of the diffusion sheet.
9. 9. The backlight module according to claim 8, wherein the brightness enhancement structure comprises a first prism sheet and a second prism sheet stacked one above the other, wherein the prism direction of the first prism sheet and the prism direction of the second prism sheet intersect each other, and the intersection angle is about 90 degrees.
10. 10. The backlight module according to claim 9, wherein the brightness enhancement structure comprises an optically transparent adhesive layer disposed between the first prism sheet and the second prism sheet, so that the first prism sheet and the second prism sheet are adhered to each other.

Description

Light guide plate and backlight module thereof Technical Field The invention relates to the technical field of optical modules, in particular to a light guide plate and a backlight module thereof. Background In the prior art, the light guide plate is used for guiding and uniformly distributing light to a target surface, and its main applications include a Liquid Crystal Display (LCD) backlight module, an advertisement display and other optical display devices. The existing light guide plate generally controls the emission characteristics of light rays through various optical design means so as to achieve the effects of uniform light emission and effective light utilization. As display products increasingly require brightness, light uniformity, and energy efficiency, light guide plate designs face more challenges. In practical applications, the design of the light guide plate needs to consider a plurality of conditions, including how to consider light uniformity, light-emitting brightness, light efficiency and manufacturing feasibility. The requirements of different application scenes on light output characteristics, dimension specifications and processing precision are different, so that the design of the light guide plate needs to be optimally balanced among multiple conditions. Therefore, how to improve the brightness and uniformity of the light guide plate while maintaining the manufacturability and cost of the structure is reasonable is still a problem to be solved in the prior art. In view of this, the present inventors conceived and proposed a light guide plate and a backlight module thereof based on a long-term experience of designing and applying an optical module, so as to overcome the problems in the prior art. Disclosure of Invention The present invention provides a light guide plate and a backlight module thereof, wherein the light guide plate is provided with a dot structure with a specific angle configuration, so that the light inside the light guide plate can be guided and adjusted in the emitting process, thereby improving the light emitting behavior and being helpful for improving the overall light utilization performance. In order to achieve the above object, in one embodiment of the present invention, a light guide plate is disclosed, which has a light incident side, an upper surface and a lower surface, wherein the upper surface and the lower surface are disposed opposite to each other and are respectively adjacent to the light incident side, and the light guide plate is characterized in that the upper surface or the lower surface of the light guide plate has a plurality of dot structures, each dot structure has a concave structure and has a light incident surface and a backlight surface, wherein in a cross section of each dot structure perpendicular to the upper surface and the lower surface and perpendicular to the light incident side, an included angle between a first line segment formed by the light incident surface and the vertical line is 50-60 degrees, an included angle between a second line segment formed by the backlight surface and the vertical line is 30-50 degrees, and an included angle between a reference surface vertically extending from a connection line of any two points on an edge line of the backlight surface and the backlight surface is 10-30 degrees. Therefore, the light can obtain better guiding and emitting effects on the light guide plate, and the brightness of the light emitting plate is improved, so that the overall light utilization efficiency is improved. In another embodiment, the depth of each dot structure is disclosed to be 5-8 μm, and by controlling the depth of the dot structure within the above range, the light can obtain a proper effect at the dot structure, so as to avoid influencing the brightness expression due to the too deep or too shallow structure, and be helpful for considering the optical effect and the manufacturing stability. Further, in still another embodiment, each of the backlight surfaces is disclosed as an arc surface. Therefore, the light has a smoother steering effect in the reflecting or guiding process, thereby being beneficial to improving the overall brightness expression and improving the light emitting stability. Based on the same technical concept, in one embodiment, the invention provides a backlight module, which comprises the light guide plate described in the previous embodiments, and an LED light bar arranged corresponding to the light incident side surface so as to provide the light incident on the light guide plate side. Through the configuration, the light can be effectively guided into the light guide plate in a side-in mode, and the light can be stably transmitted and effectively utilized by matching with the structural design of the light guide plate. In another embodiment, the backlight module further includes a reflective sheet disposed at the bottom of the light guide plate, so that the light dissipated downwards