Backlight module, and display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-12366774-B2
Application number	US-202218271700-A
Country	US
Kind code	B2
Filing date	Jul 27, 2022
Priority date	Jul 27, 2022
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A backlight module, and a display device and a driving method thereof, which relate to the technical field of displaying. The backlight module includes a substrate, and a plurality of light sources and a plurality of reflector cups arranged at one side of the substrate; each reflector cup includes a lower port, an upper port, a cup body connected between the lower port and the upper port, and a plurality of micro structures arranged on an inner wall surface of the cup body; the plurality of light sources are separately located at the lower ports of the different reflector cups; and light-emitting surfaces of the light sources face the upper ports; the micro structures have a plurality of reflecting surfaces: the reflecting surfaces are configured for reflecting light emitted by the light sources.

First claim

The invention claimed is:

1. A backlight module, comprising a substrate and a plurality of light sources and a plurality of reflector cups arranged at one side of the substrate, wherein
each reflector cup comprises a lower port, an upper port, a cup body connected between the lower port and the upper port, and a plurality of micro structures arranged on an inner wall surface of the cup body,
the plurality of light sources are separately located at the lower ports of different reflector cups, and light-emitting surfaces of the light sources face the upper ports,
the micro structures have a plurality of reflecting surfaces, the reflecting surfaces are configured for reflecting light emitted by the light sources, and normal directions of at least two reflecting surfaces in the micro structures and a normal direction of the inner wall surface of the cup body covered by the micro structures are different from one another,
the inner wall surface of the cup body comprises a curved surface protruding away from one side of an internal space of the reflector cup; a curvature of the curved surface sequentially changes in a first direction; and the first direction is a direction pointing from the lower port pointing to the upper port,
a position with a largest curvature on the inner wall surface of the cup body is a first position, and
in a normal direction of the substrate, a distance between the first position and the lower port is less than a distance between the first position and the upper port.

2. The backlight module according to claim 1 , wherein the plurality of reflecting surfaces comprise a first reflecting surface and a second reflecting surface; the first reflecting surface and the second reflecting surface share a same edge; and the same edge is an edge of the first reflecting surface and the second reflecting surface away from the inner wall surface of the cup body.

3. The backlight module according to claim 2 , wherein the same edge is perpendicular to a boundary of the lower port or the upper port.

4. The backlight module according to claim 2 , wherein an angle between the first reflecting surface and the second reflecting surface is greater than or equal to 90° and less than 180°; and/or, a length of the same edge is greater than or equal to 0.2 mm and less than or equal to 2 mm.

5. The backlight module according to claim 1 , wherein the plurality of reflecting surfaces comprise a third reflecting surface and a fourth reflecting surface; the third reflecting surface and the fourth reflecting surface share a same vertex; and the same vertex is a vertex of the third reflecting surface and the fourth reflecting surface away from the inner wall surface of the cup body.

6. The backlight module according to claim 1 , wherein the micro structures are raised structures or sunken structures arranged on the inner wall surface of the cup body.

7. The backlight module according to claim 1 , wherein the plurality of micro structures are arranged closely and/or are arranged in an array on the inner wall surface of the cup body.

8. The backlight module according to claim 1 , wherein the lower port and the upper port are both rectangular; the inner wall surface of the cup body comprises two first sub wall surfaces disposed oppositely and two second sub wall surfaces disposed oppositely;
wherein the two first sub wall surfaces are in a same shape and mirror symmetry, and the two second sub wall surfaces are in a same shape and mirror symmetry.

9. The backlight module according to claim 1 , wherein an orthographic projection of the lower port on the substrate is located within a range of an orthographic projection of the upper port on the substrate; and/or
a center of the orthographic projection of the lower port on the substrate overlaps with a center of the orthographic projection of the upper port on the substrate; and/or
an orthographic projection of the inner wall surface of the cup body on the substrate is located within the range of the orthographic projection of the upper port on the substrate.

10. The backlight module according to claim 1 , wherein the inner wall surface of the cup body comprises a plurality of sub wall surfaces, and an angle between two adjacent sub wall surfaces is a chamfer.

11. The backlight module according to claim 1 , wherein the plurality of reflector cups are arranged in an array; the upper ports of two adjacent reflector cups comprise a first upper port and a second upper port;
wherein the first upper port has a first side edge close to the second upper port, the second upper port has a second side edge close to the first upper port, and the first side edge is parallel to the second side edge.

12. The backlight module according to claim 1 , wherein a minimum distance between two adjacent upper ports is greater than or equal to 0.2 mm and less than or equal to 2 mm.

13. The backlight module according to claim 1 , wherein in the normal direction of the substrate, a distance between the lower port and the upper port is greater than or equal to 10 mm and less than or equal to 30 mm.

14. A display device, comprising a display panel, and the backlight module according to claim 1 , located at a backlight side of the display panel.

15. The display device according to claim 14 , wherein the backlight module comprises a plurality of backlight partitions, each backlight partition comprises at least one light source, and the light sources located in the same backlight partition simultaneously emit light or do not emit light;
the display device further comprises a control module, a display driving module, and a backlight driving module;
wherein the control module is connected to the display driving module and the backlight driving module respectively, and is configured to receive a display signal and generate, according to the display signal, backlight driving signals corresponding to the backlight partitions;
the backlight driving module is further connected to the backlight partitions, and is configured to drive, according to the backlight driving signals, the backlight partitions to emit light or not emit light; and
the display driving module is further connected to the display panel, and is configured to drive, according to the display signal, the display panel to perform displaying.

16. A driving method, applied to the display device according to claim 14 , wherein the backlight module comprises a plurality of backlight partitions; each backlight partition comprises at least one light source; the light sources located in the same backlight partition simultaneously emit light or do not emit light; and the driving method comprises:
receiving a display signal;
according to the display signal, generating backlight driving signals corresponding to the backlight partitions;
according to the backlight driving signals, driving the backlight partitions to emit light or not emit light;
according to the display signal, driving the display panel to perform displaying.

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Chi Weining
• Han Rui
• Yoon Daekeun
• Ma Qing
• Cui Dong
• Zhang Zhipeng
• Wang Fengping
• Zhai Yue
• Li Wenyang
• Qi yongle
• Leng Shouyang
• Li Biqi

Classifications

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F1/133605 Primary

  including specially adapted reflectors · CPC title

• G02F1/1336

  Illuminating devices · CPC title