Backlight module and display device using same

• US 10,571,625 B2
• Filed: 02/15/2019
• Issued: 02/25/2020
• Est. Priority Date: 04/19/2018
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Tsai, Chia-Yi, Hsu, Yao-Pin, Huang, Li-Chiao, Tai, Ming-Cheng
• Primary Examiner(s): Breval, Elmito
• Application Number:
  US16/276,912
• Publication Number:
  US 20190324194A1
• Time in Patent Office: 375 Days
• Field of Search: None
• 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: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light

Abstract

A backlight module includes a substrate, a plurality of light sources on a surface of the substrate, a color conversion layer on a side of the plurality of light sources away from the substrate, and a frame between the substrate and the color conversion layer. Each light source is a light emitting diode chip configured for emitting light of a first color. The color conversion layer is configured for converting light to light of a second color. The frame surrounds the light sources. The frame includes dyes configured to absorb the light of the first color.

Claims

1. A backlight module, comprising:

a substrate;

a plurality of light sources on a surface of the substrate, each of the plurality of light sources being a light emitting diode chip configured for emitting light of a first color;

a color conversion layer on a side of the plurality of light sources away from the substrate, the color conversion layer being configured for converting light of the first color to light of a second color; and

a frame between the substrate and the color conversion layer, the frame surrounding the plurality of light sources;

wherein the frame comprises dyes configured to absorb the light of the first color.

2. The backlight module of claim 1, wherein the substrate is a circuit board.

3. The backlight module of claim 1, wherein the light of the first color is blue light;

the light of a second color is yellow light;

the frame comprises dyes of yellow color.

4. The backlight module of claim 1, further comprising a plurality of additional color conversion layers;

wherein each of the plurality of additional color conversion layers corresponds to and covers one of the plurality of light sources.

5. The backlight module of claim 4, wherein light of the first color is blue light;

each of the plurality of additional color conversion layers is a red conversion layer, light of the second color is green light;

the frame comprises dyes of green color.

6. The backlight module of claim 4, wherein light of the first color is blue light;

each of the plurality of additional color conversion layers is a green conversion layer, the light of the second color is red light;

the frame comprises dyes of red color.

7. A backlight module, comprising:

a reflective film;

a light guiding plate stacked on a side of the reflective film;

a color conversion layer stacked on a side of the light guiding plate away from the reflective film, the color conversion layer being configured for converting color of light;

a frame surrounding the reflective film, the light guiding plate, and the color conversion layer; and

a plurality of light sources between the frame and the light guiding plate, each of the plurality of light sources is a light emitting diode chip being configured for emitting light;

wherein the frame comprises dyes configured to absorb the light from the plurality of light sources.

8. The backlight module of claim 7, wherein each of the plurality of light sources emits blue light;

the color conversion layer is a yellow conversion layer;

the frame comprises dyes of yellow color.

9. The backlight module of claim 7, wherein each of the plurality of light sources emits blue light and green light;

the color conversion layer is a red conversion layer;

the frame comprises dyes of red color.

10. The backlight module of claim 7, wherein each of the plurality of light sources emits blue light and red light;

the color conversion layer is a green conversion layer;

the frame comprises dyes of green color.

11. The display device of claim 10, wherein the backlight module further comprises a reflective film and a light guiding plate stacked on a side of the reflective film;

the color conversion layer is stacked on a side of the light guiding plate away from the reflective film;

the frame surrounds the reflective film, the light guiding plate, and the color conversion layer; and

the plurality of light sources is between the frame and the light guiding plate.

12. The display device of claim 11, wherein each of the plurality of light sources emits blue light;

the color conversion layer is a yellow conversion layer;

the frame comprises dyes of yellow color.

13. The display device of claim 11, wherein each of the plurality of light sources emits blue light and green light;

the color conversion layer is a red conversion layer;

the frame comprises dyes of red color.

14. The display device of claim 11, wherein each of the plurality of light sources emits blue light and red light;

the color conversion layer is a green conversion layer;

the frame comprises dyes of green color.

16. The display device of claim 10, wherein the backlight module further comprises a substrate;

the plurality of light sources are on a surface of the substrate;

the color conversion layer is on a side of the plurality of light sources away from the substrate, the color conversion layer is configured for converting light to light of a second color; and

the frame is between the substrate and the color conversion layer, the frame surrounds the plurality of light sources;

the substrate is a circuit board.

17. The display device of claim 16, wherein each of the plurality of light sources emits blue light;

the light of a second color is yellow light;

the frame comprises dyes of yellow color.

18. The display device of claim 16, wherein the backlight module further comprises a plurality of additional color conversion layers;

wherein each of the plurality of additional color conversion layers corresponds to and covers one of the plurality of light sources.

19. The display device of claim 18, wherein each of the plurality of light sources emits blue light;

each of the plurality of additional color conversion layers is a red conversion layer, light of the second color is green light;

the frame comprises dyes of green color.

20. The display device of claim 18, wherein each of the plurality of light sources emits blue light;

each of the plurality of additional color conversion layers is a green conversion layer, light of the second color is red light;

the frame comprises dyes of red color.

15. A display device, comprising:

a backlight module; and

a display panel stacked on the backlight module;

the backlight module, comprising;

a plurality of light sources, each of the plurality of light sources being a light emitting diode chip configured for emitting light;

a color conversion layer configured for receiving and converting color of light from the plurality of light sources; and

a frame by a side of the plurality of light sources;

wherein the frame comprises dyes configured to absorb a portion of the light from the plurality of light sources.