Backlight module and illuminating device

Abstract

The invention relates to a backlight module and an illuminating device. The backlight module includes the illuminating device, a first substrate, a second substrate and a coating layer. The illuminating device further includes a lamp filled with a gas and a fluorescent material coated on the surface of the lamp. The coating layer further comprises a quantum dot material.

Description

BRIEF DESCRIPTION OF DRAWINGS

The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

FIG. 1 shows the color gamut of a conventional CCFL in comparison with those defined by the CIE 1931 and the NTSC;

FIG. 2 is a diagram showing wave length versus intensity in a conventional CCFL;

FIG. 3 is a schematic representation of an illuminating device of the invention;

FIG. 4 shows a cross section taken along A-A′ line in FIG. 3 of the illuminating device of the invention;

FIG. 5 is a diagram showing wave length versus intensity of the illuminating device of the invention;

FIG. 6 shows the color gamut of the illuminating device of the invention in comparison with that defined by the NTSC;

FIG. 7 shows a cross section taken along A-A′ line in FIG. 3 of the illuminating device of the invention; and

FIGS. 8-15 show cross sections of the backlight module of the invention.

Claims

1. An illuminating device, comprising: a lamp filled with a gas;a fluorescent material coated on an inner wall of the lamp; anda coating layer having at least a quantum dot material, wherein the coating layer is coated on the inner wall or an outer wall of the lamp.

2. The illuminating device as claimed in claim 1, wherein the gas comprises an inert gas, a gas with mercury vapor or particles, or an electroluminescent material.

3. The illuminating device as claimed in claim 1, wherein the lamp comprises glass, plastic, ceramic or a transparent material.

4. The illuminating device as claimed in claim 1, wherein the lamp is a rectangular, looped, arced, polygonal, flat, regular or non-regular shape.

5. The illuminating device as claimed in claim 1, wherein the lamp is a mercury vapor fluorescent lamp, an external electrode fluorescent lamp (EEFL), a cold cathode vapor fluorescent lamp (CCFL) or a gas discharge lamp.

6. The illuminating device as claimed in claim 1, wherein the fluorescent material comprises a powdered material which can emit red, blue, or green color rays, excited by ultraviolet ray.

7. The illuminating device as claimed in claim 1, wherein the quantum dot material comprises II-VI, III-V or IV-VI semiconductor nano-crystal.

8. The illuminating device as claimed in claim 1, wherein the quantum dot material is CdSe, ZnS, CdTe, PbS, CdS, PbSe or a mixture thereof.

9. The illuminating device as claimed in claim 1, wherein the quantum dot material has an absorption spectrum of a 300 nm-400 nm ultraviolet spectrum, a 400 nm-700 nm visible spectrum or a 700 nm-2500 nm infrared spectrum.

10. A backlight module, comprising: a first substrate;a second substrate disposed opposite to the first substrate;an illuminating device placed between the first and second substrates and comprising: a lamp filled with a gas; anda fluorescent material coated on an inner wall of the lamp; anda coating layer having at least a quantum dot material, wherein the coating layer is coated on the first substrate, the second substrate or the lamp.

11. The backlight module as claimed in claim 10, wherein the first substrate and the second substrate are a diffuser and a reflector, respectively.

12. The backlight module as claimed in claim 10, wherein the coating layer is partially or fully coated on the first substrate or the second substrate.

13. The backlight module as claimed in claim 10, wherein the gas comprises an inert gas, a gas with mercury vapor or particles, or an electroluminescent material.

14. The backlight module as claimed in claim 10, wherein the lamp is a mercury vapor fluorescent lamp, an external electrode fluorescent lamp (EEFL), a cold cathode vapor fluorescent lamp (CCFL) or a gas discharge lamp.

15. The backlight module as claimed in claim 10, wherein the fluorescent material comprises a powdered material which can emit red, blue, or green color rays, excited by ultraviolet ray.

16. The backlight module as claimed in claim 10, wherein the quantum dot material comprises II-VI, III-V or IV-VI semiconductor nano-crystal.

17. The backlight module as claimed in claim 10, wherein the quantum dot material is CdSe, ZnS, CdTe, PbS, CdS, PbSe or a mixture thereof.

18. The backlight module as claimed in claim 10, wherein the quantum dot material has an absorption spectrum of a 300 nm-400 nm ultraviolet spectrum, a 400 nm-700 nm visible spectrum or a 700 nm-2500 nm infrared spectrum.

19. The backlight module as claimed in claim 10, wherein the coating layer comprises a plurality of quantum dot materials coated on the first substrate or the second substrate in sequence or after mixing, and each of the quantum dot materials has different materials and dimensions.

20. The backlight module as claimed in claim 10, wherein the coating layer is coated on the inner wall or outer wall of the lamp.