US 12,326,590 B2
Light guide plate, backlight module, and display device
Hao Chen, Kaohsiung (TW); Chin-Ting Weng, Kaohsiung (TW); Chia-Yin Chang, Kaohsiung (TW); and Feng-Nien Tsai, Kaohsiung (TW)
Assigned to Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed by Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed on Jun. 26, 2024, as Appl. No. 18/754,198.
Application 18/754,198 is a continuation of application No. 17/817,658, filed on Aug. 5, 2022, granted, now 12,044,879.
Application 17/817,658 is a continuation of application No. PCT/CN2021/131127, filed on Nov. 17, 2021.
Claims priority of application No. PCT/CN2020/130229 (WO), filed on Nov. 19, 2020.
Prior Publication US 2024/0345309 A1, Oct. 17, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0055 (2013.01) [G02B 6/0053 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A light guide plate configured to be coupled with a light source, wherein the light guide plate comprises:
a light-emitting surface;
a bottom surface opposite to the light-emitting surface;
a light-incident surface connected between the light-emitting surface and the bottom surface, and light emitted by the light source entering the light guide plate through the light-incident surface;
a plurality of stripe-shaped microstructures disposed on at least one of the light-emitting surface and the bottom surface; and
a plurality of light-guiding microstructures disposed between any adjacent two of the stripe-shaped microstructures and arranged along an extending direction of each of the stripe-shaped microstructures;
wherein each of the light-guiding microstructures comprises a light-facing surface and an opposite light-facing surface interconnected to each other, and an inclination degree of the light-facing surface is smaller than an inclination degree of the opposite light-facing surface;
wherein the light-facing surface comprises a first reflective surface and a second reflective surface connected to each other, an inclination degree of the first reflective surface is smaller than an inclination degree of the second reflective surface, and one of the first reflective surface and the second reflective surface is connected to the opposite light-facing surface;
wherein the light guide plate comprises an opposite light-incident surface opposite to the light-incident surface;
each of the stripe-shaped microstructures comprises a first portion, a second portion, and a third portion, wherein the first portion has a first width and is close to the light-incident surface, the second portion has a second width and is close to the opposite light-incident surface, and the third portion is between the first portion and the second portion and has a third width; and
the third width is larger than the first width, and the first width is larger than the second width.