BACKLIGHT MODULE, METHODS OF MANUFACTURING THE SAME, AND DISPLAY DEVICE

• US 20180046023A1
• Filed: 09/19/2016
• Published: 02/15/2018
• Est. Priority Date: 01/08/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: KIM, Ki Man
• Granted Patent: US 10,466,401 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 6/0011 the light guides being planar or of plate-like form
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133524 Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 2203/055 wavelength filtering

Abstract

A backlight module, and a manufacturing method thereof, and a display device are provided. The backlight module includes a backlight source, a light guide plate, at least one optical film, and a multilayer coating; the multilayer coating is provided at at least one side of the at least one optical film; the multilayer coating is configured for decreasing light transmittance of at least one given wavelength; the backlight source is provided at a side of the light guide plate, and configured for providing white light, the light guide plate is configured for guiding the white light toward the optical film, and the white light is emitted out after transmitting through the optical film.

Claims

1. A backlight module, comprising:

a backlight source, a light guide plate, at least one optical film, and a multilayer coating;

wherein,

the multilayer coating is provided at at least one side of the at least one optical film;

the multilayer coating is configured for decreasing light transmittance of at least one given wavelength;

the backlight source is provided at a side of the light guide plate and configured for providing white light, the light guide plate is configured for guiding the white light toward the optical film, and the white light is emitted out after transmitting through the optical film.

2. The backlight module according to claim 1, wherein a material of the light guide plate is glass and the multilayer coating is configured for decreasing transmittance of yellow light.

3. The backlight module according to claim 2, wherein the multilayer coating is configured for gradually decreasing the transmittance of yellow light in a direction, which is away from the backlight source, along the light guide plate.

4. The backlight module according to claim 3, wherein the at least one optical film comprises any one of a diffuser film, a prism film or a reflective polarizer.

5. The backlight module according to claim 1, wherein the optical film comprises a diffuser film, the diffuser film is provided at a light-emitting side of the light guide plate, and the multilayer coating is provided at a light-incident side of the diffuser film.

6. The backlight module according to claim 1, wherein the optical film comprises a prism film, the prism film is provided at a light-emitting side of the diffuser film, and the multilayer coating is provided at a light-incident side of the prism film.

7. The backlight module according to claim 1, wherein the optical film comprises a first prism film and a second prism film, the first prism film is close to the diffuser film, and

the backlight module comprises two multilayer coatings, one of which is provided at a light-incident side of the first prism film, and the other of which is provided at a light-incident side of the second prism film.

8. The backlight module according to claim 7, wherein the optical film further comprises a reflective polarizer, and the backlight module further comprises another multilayer coating;

and

the reflective polarizer is provided at a light-emitting side of the second prism film, and the another multilayer coating is provided at a light-incident side and/or a light-emitting side of the reflective polarizer.

9. The backlight module according to claim 1, wherein the multilayer coating comprises a plurality of silicon dioxide layers and a plurality of titanium dioxide layers, and the plurality of silicon dioxide layers and the plurality of titanium dioxide layers are alternately provided.

10. The backlight module according to claim 9, wherein a thickness of the multilayer coating is gradually increased in the direction, which is away from the backlight source, along the light guide plate.

18. A display device, comprising:

the backlight module according to claim 1, and

a liquid crystal display panel,

wherein, the backlight module is configured for providing back light for the liquid crystal display panel for display.

19. The display device according to claim 18, further comprising a lower polarizer and an upper polarizer respectively provided at a light-incident side and a light-emitting side of the display panel, and a second multilayer coating layer,

wherein, the second multilayer coating layer is provided at a light-incident side of the lower polarizer.

20. The backlight module according to claim 1, wherein a thickness of the multilayer coating is gradually increased in the direction, which is away from the backlight source, along the light guide plate.

11. A method of manufacturing a backlight module, comprising:

providing a backlight source, a light guide plate, and at least one optical film; and

forming a multilayer coating at at least one side of the at least one optical film;

wherein the multilayer coating is configured for decreasing light transmittance of at least one given wavelength;

the backlight source is provided at a side of the light guide plate and configured for providing white light, the light guide plate is configured for guiding the white light toward the optical film, and the white light is emitted out after transmitting through the optical film.

12. The method of manufacturing the backlight module according to claim 11, wherein the multilayer coating is configured for decreasing transmittance of yellow light.

13. The method of manufacturing the backlight module according to claim 12, wherein the multilayer coating comprises a plurality of silicon dioxide layers and a plurality of titanium dioxide layers.

14. The method of manufacturing the backlight module according to claim 13, wherein forming of the multilayer coating at at least one side of the at least one optical film comprises:

alternately forming the plurality of silicon dioxide layers and the plurality of titanium dioxide layers at at least one side of the at least one optical film through a laminating process.

15. The method of manufacturing the backlight module according to claim 14, wherein the laminating process is a thermal evaporation process under a vacuum condition.

16. The method of manufacturing the backlight module according to claim 15, wherein,

a pressure of the thermal evaporation process is 10⁻

6-10<sup>−

7</sup> Pa;

a temperature for thermally evaporating silicon dioxide is higher than 150°

C.; and

a temperature for thermally evaporating titanium dioxide is higher than 350°

C.

17. The method of manufacturing the backlight module according to claim 16, wherein the temperature for thermally evaporating silicon dioxide is 150°

C.-300°

C.; and

the temperature for thermally evaporating titanium dioxide is 350°

C.-500°

C.