A backlight module, a display module, and a display device.

By designing an optical film with grooves and a Lambertian LED structure in the backlight module, the problem of insufficient brightness and viewing angle of direct-lit backlight modules is solved, achieving an increase in brightness and viewing angle while maintaining brightness, making it suitable for display devices with high requirements for brightness and viewing angle.

CN224287299UActive Publication Date: 2026-05-26BEIJING BOE DISPLAY TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
BEIJING BOE DISPLAY TECH CO LTD
Filing Date
2025-04-25
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Direct-lit backlight modules have a smaller brightness and viewing angle, which cannot meet the display needs of applications with high brightness and viewing angle requirements, such as medical display equipment, video walls, and classroom displays.

Method used

An optical film is designed in the backlight module, including a substrate and multiple diffusion structures. The side of the diffusion structure away from the back plate has a groove, and the incident light diffuses out from the groove. The brightness viewing angle is improved by adjusting the arrangement direction and gap width of the diffusion structure. At the same time, the dimming part of the lamp bead is removed, and a Lambertian lamp bead and a tilted base plate structure are used to optimize the light distribution.

Benefits of technology

The brightness and viewing angle of the backlight module have been improved, the light emission angle has been increased, the appearance of bright and dark stripes has been avoided, and the application requirements for high brightness and viewing angle have been met, while maintaining or improving the overall brightness.

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    Figure CN224287299U_ABST
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Abstract

A backlight module, a display module, and a display device are disclosed. The backlight module includes: a back plate, comprising side plates connected end-to-end and a bottom plate located on one side of the side plates, the side plates and the bottom plate forming a cavity with an opening on one side; a plurality of light strips disposed on the side of the bottom plate facing the opening; a diffuser plate located on the side of the plurality of light strips away from the back plate; at least one optical film located on the side of the diffuser plate away from the back plate; the optical film includes a substrate and a plurality of diffusion structures; the plurality of diffusion structures are located on the side of the substrate away from the back plate, and the arrangement direction of the plurality of diffusion structures intersects the edge of the substrate; wherein the side of the diffusion structure away from the back plate has at least one groove, and light incident on the diffusion structure diffuses out from the groove.
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