US 12,468,082 B2
Backlight module and display device
Wei-Hsuan Chen, Kaohsiung (TW); Chun-Hau Lai, Kaohsiung (TW); and Wen-Hao Cai, Kaohsiung (TW)
Assigned to Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed by Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed on Oct. 25, 2024, as Appl. No. 18/927,724.
Application 18/927,724 is a continuation of application No. PCT/CN2023/090823, filed on Apr. 6, 2023.
Claims priority of application No. 202210460207.1 (CN), filed on Apr. 28, 2022.
Prior Publication US 2025/0044495 A1, Feb. 6, 2025
Int. Cl. F21V 8/00 (2006.01); G02F 1/1335 (2006.01)
CPC G02B 6/0053 (2013.01) [G02B 6/0036 (2013.01); G02F 1/133607 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A backlight module, comprising:
a surface light source;
an optical film, installed on an emitting side of the surface light source; and
a light control film, comprising a first reference surface and multiple first optical structures positioned on the first reference surface, wherein the first reference surface is located on one side of the light control film facing away from the optical film, each of said first optical structures comprises a first optical surface and a second optical surface, wherein the first optical surface and the second optical surface are arranged along a first direction, the first optical surface and the first reference surface form a first included angle θ1, the second optical surface and the first reference surface form a second included angle θ2, the first included angle θ1 is an acute angle, and the first included angle 01 is smaller than the second included angle θ2;
wherein the light control film further comprising a second reference surface relative to the first reference surface and multiple second optical structures arranged along the first direction on the second reference surface, each of the first optical structures extends along a second direction, where the first direction is not parallel to the second direction, each of the second optical structures extends along the second direction, each of the second optical structures consists of a third optical surface and a fourth optical surface, the third optical surface and the second reference surface form a third included angle θ3, the fourth optical surface and the second reference surface form a fourth included angle θ4, and the third included angle θ3 is acute and smaller than the fourth included angle θ4;
wherein the light emitted by the surface light source has an output angle δ relative to the forward direction of the backlight module when passing through the optical film; and
wherein the output angle δ of the optical film, the first included angle θ1 of at least one of said first optical structures, the third included angle θ3 of at least one of said second optical structures, and the critical angle θc of the light control film satisfy the following relationship: δ+(θ1+θ3)<θc.