Backlight module and display device

Patent metadata

Field	Value
Publication number	US-10120117-B2
Application number	US-201615109425-A
Country	US
Kind code	B2
Filing date	May 25, 2016
Priority date	Apr 22, 2016
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

The present invention provides a backlight module. The backlight module includes a plastic frame, a backlight source and a light guide plate. The backlight source and the light guide plate are received in the plastic frame. The light guide plate includes a light incident surface and a light emitting surface. The backlight source includes a circuit board, a reflecting collimator lens fixed to the circuit board and a LED lamp disposed inside the reflecting collimator lens. The reflecting collimator lens includes a parabolic reflecting surface, and the LED lamp is located at a center location of the parabolic reflecting surface. The light incident surface is covered with a color polarizing layer, and the parabolic reflecting surface faces toward the color polarizing layer. The present invention also discloses a display device.

First claim

What is claimed is:

1. A backlight module, comprising
a plastic frame;
a backlight source; and
a light guide plate;
wherein, the backlight source and the light guide plate are received in the plastic frame; the light guide plate includes a light incident surface and a light emitting surface; the backlight source includes a circuit board, a reflecting collimator lens fixed to the circuit board and a LED lamp disposed inside the reflecting collimator lens; the reflecting collimator lens includes a parabolic reflecting surface, and the LED lamp is located at a center location of the parabolic reflecting surface; the light incident surface is covered with a color polarizing layer, and the parabolic reflecting surface faces toward the color polarizing layer.

2. The backlight module according to claim 1 , wherein, the light guide plate includes a bottom surface disposed oppositely to the light emitting surface, the light incident surface is connected with the bottom surface and the light emitting surface, and an included angle is formed between the light incident surface and the bottom surface.

3. The backlight module according to claim 2 , wherein, the first color film layer is made of one of ZnS, TiO 2 , CeO, CeO 2 , Ta 2 O 5 and SnO 2 .

4. The backlight module according to claim 2 , wherein, the second color filter is made of one of SiO 2 , MgF 2 , NaAlF 6 , ThF 4 and BaF 2 .

5. The backlight module according to claim 2 , wherein, the included angle between the light incident surface and the bottom surface is greater than 0 degree and less than 90 degrees.

6. The backlight module according to claim 1 , wherein, the color polarizing layer includes a first color film layer and a second color film layer overlapped with the first color film layer, and a refractive index of the first color film layer is greater than a refractive index of the second color film layer.

7. The backlight module according to claim 6 , wherein, the color polarizing layer further includes a glass substrate, and the glass substrate is used for carrying the first color film layer and the second color film layer.

8. The backlight module according to claim 6 , wherein, the first color film layer is made of one of ZnS, TiO2, CeO, CeO2, Ta2O5 and SnO2.

9. The backlight module according to claim 6 , wherein, the second color filter is made of one of SiO2, MgF2, NaAlF6, ThF4 and BaF2.

10. The backlight module according to claim 1 , wherein, the color polarizing layer includes multiple first color film layers and multiple second color film layers, the first color film layers and the second color film layers are disposed alternately and are overlapped, and a refractive index of each first color film layer is greater than a refractive index of each second color film layer.

11. A display device including a backlight module and a liquid crystal panel, and the backlight module, comprises:
a plastic frame;
a backlight source; and
a light guide plate;
wherein, the backlight source and the light guide plate are received in the plastic frame; the light guide plate includes a light incident surface and a light emitting surface; the backlight source includes a circuit board, a reflecting collimator lens fixed to the circuit board and a LED lamp disposed inside the reflecting collimator lens; the reflecting collimator lens includes a parabolic reflecting surface, and the LED lamp is located at a center location of the parabolic reflecting surface; the light incident surface is covered with a color polarizing layer, and the parabolic reflecting surface faces toward the color polarizing layer; the liquid crystal panel is installed on the backlight module, a light emitted from the backlight source enters the liquid crystal panel after emitted from the light emitting surface of the light guide plate.

12. The display device according to claim 11 , wherein, the light guide plate includes a bottom surface disposed oppositely to the light emitting surface, the light incident surface is connected with the bottom surface and the light emitting surface, and an included angle is formed between the light incident surface and the bottom surface.

13. The display device according to claim 12 , wherein, the first color film layer is made of one of ZnS, TiO 2 , CeO, CeO 2 , Ta 2 O 5 and SnO 2 .

14. The display device according to claim 12 , wherein, the included angle between the light incident surface and the bottom surface is greater than 0 degree and less than 90 degrees.

15. The display device according to claim 11 , wherein, the color polarizing layer includes a first color film layer and a second color film layer overlapped with the first color film layer, and a refractive index of the first color film layer is greater than a refractive index of the second color film layer.

16. The display device according to claim 15 , wherein, the second color filter is made of one of SiO 2 , MgF 2 , NaAlF 6 , ThF 4 and BaF 2 .

17. The display device according to claim 15 , wherein, the color polarizing layer further includes a glass substrate, and the glass substrate is used for carrying the first color film layer and the second color film layer.

18. The display device according to claim 11 , wherein, the color polarizing layer includes multiple first color film layers and multiple second color film layers, the first color film layers and the second color film layers are disposed alternately and are overlapped, and a refractive index of each first color film layer is greater than a refractive index of each second color film layer.

Assignees

• Shenzhen China Star Optoelect

Inventors

• Fan Yong

Classifications

• G02B5/207 Primary

  comprising semiconducting materials · CPC title

• G02B6/0031

  Reflecting element, sheet or layer · CPC title

• G02B6/002

  by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces · CPC title

• G02B6/0026 Primary

  Wavelength selective element, sheet or layer, e.g. filter or grating · CPC title

• G02F1/13362

  providing polarized light, e.g. by converting a polarisation component into another one · CPC title