Backlight Module

• US 20170184916A1
• Filed: 09/25/2015
• Published: 06/29/2017
• Est. Priority Date: 09/22/2015
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: FAN, Yong
• Granted Patent: US 9,841,627 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0078 Side-by-side arrangements, e.g. for large area displays
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• CPC Class Codes: H01L 33/405 Reflective materials

Abstract

A backlight module includes a substrate having an opening on top, a first reflective plate disposed on a bottom surface of the substrate, light guide plates disposed on the first reflective plate with intervals in between, backlight source components, and a plurality of optical films disposed on the opening of the substrate. The backlight source components comprise heat sink shelves, and point light sources that are fixed on the heat sink shelves and inserted in the interval between two neighboring light guide plates. The present invention effectively reduces the width and thickness of the backlight module, and is instrumental for a narrow-frame and ultra-thin design, effectively reduce production cost. Meanwhile, the arrangement ensures good backlight uniformity, and is instrumental in reducing the distance needed for light mixing. Additionally, the defect of dark band appearing around the backlight module of traditional backlight modules can be effectively eliminated.

Claims

1. A backlight module, comprising:

a substrate having an opening on top;

a first reflective plate, disposed on a bottom surface of the substrate;

a plurality of light guide plates, disposed on the first reflective plate with intervals in between;

backlight source components comprising heat sink shelves, and point light sources that are fixed on the heat sink shelves and inserted in the interval between two neighboring light guide plates; and

a plurality of optical films disposed on the opening of the substrate.

2. The backlight module of claim 1, wherein

the heat sink shelf comprises a horizontal part and a vertical part that are perpendicular to each other;

the point light sources are fixed on the vertical part which goes through the first reflective plate and inserts in the interval between two neighboring light guide plates;

the horizontal part is sandwiched between the first reflective plate and the bottom surface of the substrate.

3. The backlight module of claim 1, wherein the point light sources are a plurality of light-emitting diodes (LEDs) disposed circularly on the heat sink shelves.

4. The backlight module of claim 1, wherein the point light sources are quantum tubes.

5. The backlight module of claim 1, further comprising a diffuser plate, which is disposed between the set of optical films and the substrate.

6. The backlight module of claim 5, further comprising supporting pillars disposed on the light guide plate to support the diffuser plate.

7. The backlight module of claim 1, further comprising dot diffusion films sticking on and covering the interval between any two neighboring light guide plates.

8. The backlight module of claim 1, wherein walls of the substrate comprise a first part that is neighboring to the bottom surface of the substrate, and a second part that extends from the first part and folds outward as it goes upward;

a second reflective plate is adhered to the internal surface of both the first part and the second part.

9. The backlight module of claim 8, wherein the angle between the first part with the second reflective plate adhering to it and the bottom surface of the substrate is no larger than 90°

.

10. The backlight module of claim 8, wherein the height from the bottom surface of the substrate to the top of the first part with the second reflective plate adhering to it is larger than the thickness of the light guide plate.

11. The backlight module of claim 2, wherein walls of the substrate comprise a first part that is neighboring to the bottom surface of the substrate, and a second part that extends from the first part and folds outward as it goes upward;

a second reflective plate is adhered to the internal surface of both the first part and the second part.

12. The backlight module of claim 11, wherein the angle between the first part with the second reflective plate adhering to it and the bottom surface of the substrate is no larger than 90°

.

13. The backlight module of claim 11, wherein the height from the bottom surface of the substrate to the top of the first part with the second reflective plate adhering to it is larger than the thickness of the light guide plate.

14. The backlight module of claim 5, wherein walls of the substrate comprise a first part that is neighboring to the bottom surface of the substrate, and a second part that extends from the first part and folds outward as it goes upward;

a second reflective plate is adhered to the internal surface of both the first part and the second part.

15. The backlight module of claim 14, wherein the angle between the first part with the second reflective plate adhering to it and the bottom surface of the substrate is no larger than 90°

.

16. The backlight module of claim 14, wherein the height from the bottom surface of the substrate to the top of the first part with the second reflective plate adhering to it is larger than the thickness of the light guide plate.

17. The backlight module of claim 6, wherein walls of the substrate comprise a first part that is neighboring to the bottom surface of the substrate, and a second part that extends from the first part and folds outward as it goes upward;

a second reflective plate is adhered to the internal surface of both the first part and the second part.

18. The backlight module of claim 17, wherein the angle between the first part with the second reflective plate adhering to it and the bottom surface of the substrate is no larger than 90°

.

19. The backlight module of claim 17, wherein the height from the bottom surface of the substrate to the top of the first part with the second reflective plate adhering to it is larger than the thickness of the light guide plate.

20. A backlight module, comprising:

a substrate having an opening on top;

a first reflective plate, disposed on a bottom surface of the substrate;

a plurality of light guide plates, disposed on the first reflective plate with intervals in between;

backlight source components comprising heat sink shelves, and point light sources that are fixed on the heat sink shelves and inserted in the interval between two neighboring light guide plates;

a plurality of optical films disposed on the opening of the substrate; and

dot diffusion films, sticking on and covering the interval between any two neighboring light guide plates.