Quantum dot light emitting device, backlight module, and liquid crystal display device

• US 10,203,547 B2
• Filed: 11/15/2016
• Issued: 02/12/2019
• Est. Priority Date: 06/16/2016
• Status: Active Grant

• Current Assignee: Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Hisense Electric Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Inventors: Li, Fulin
• Primary Examiner(s): Nguyen, Dung
• Application Number:
  US15/351,981
• Publication Number:
  US 20170059129A1
• Time in Patent Office: 819 Days
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 2202/043 pleochroic
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body

Abstract

This disclosures provides a quantum dot light emitting device, a backlight module, and a liquid crystal display device, the quantum dot light emitting device including: a light emitting device configured to generate exciting light at a first wavelength; a first quantum dot package layer configured to absorb the exciting light at the first wavelength, and to generate converted light at a second wavelength; and a second quantum dot package layer configured to absorb the exciting light at the first wavelength, and to generate converted light at a third wavelength; wherein the first quantum dot package layer is located between the light emitting device and the second quantum dot package layer, and the third wavelength is shorter than the second wavelength, and longer than the first wavelength.

Claims

1. A quantum dot light emitting device comprising:

a light emitting device configured to generate exciting light at a first wavelength;

a first quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a second wavelength;

a second quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a third wavelength; and

a dichroism component arranged between the first quantum dot package layer and the second quantum dot package, the dichroism component configured to transmit the light at the first wavelength and the light at the second wavelength, and reflect the light at the third wavelength;

wherein the first quantum dot package layer is arranged between the light emitting device and the second quantum dot package layer, and wherein the third wavelength is shorter than the second wavelength, and longer than the first wavelength.

2. A quantum dot light emitting device comprising:

a light emitting device configured to generate exciting light at a first wavelength;

a first quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a second wavelength;

a second quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a third wavelength;

wherein the first quantum dot package layer is arranged between the light emitting device and the second quantum dot package layer, wherein the third wavelength is shorter than the second wavelength, and longer than the first wavelength, and wherein a shortest distance between opposite surfaces of the first quantum dot package layer and the light emitting device is more than 3 mm.

3. The quantum dot light emitting device according to claim 2, wherein inner and outer surfaces of the first quantum dot package layer and the second quantum dot package layer are arc-shaped, wherein the outer surfaces protruding outward are light exit surfaces, and wherein the inner surfaces protruding inward are light incident surfaces.

4. The quantum dot light emitting device according to claim 3, further comprising a circuit board on which the light emitting device is arranged, wherein the first quantum dot package layer and the second quantum dot package layer are connected with the circuit board, and disposed around the light emitting device.

5. The quantum dot light emitting device according to claim 2, further comprising a package substrate disposed in a groove structure, wherein the light emitting device is arranged on a bottom of the package substrate in the groove structure, and wherein the first quantum dot package layer and the second quantum dot package layer are disposed at an opening of the groove.

6. The quantum dot light emitting device according to claim 5, wherein light exit surfaces of the first quantum dot package layer and the second quantum dot package layer are planar.

7. The quantum dot light emitting device according to claim 2, further comprising a sealing component disposed formed on an outer surface of the second quantum dot package layer and configured to seal the second quantum dot package layer.

8. The quantum dot light emitting device according to claim 2, wherein the converted light at the second wavelength is allowed to transmit through the second quantum dot package layer without exciting the second quantum dot package layer.

9. A liquid crystal display device comprising:

a backlight module; and

a liquid crystal display panel arranged above the backlight module;

wherein the backlight module comprises a quantum dot light emitting device, wherein the quantum dot light emitting device comprises a light emitting device configured to generate exciting light at a first wavelength, a first quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a second wavelength, a second quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a third wavelength, and a dichroism component configured to transmit the light at the first wavelength and the light at the second wavelength, and reflect the light at the third wavelength, wherein the dichroism component is arranged between the first quantum dot package layer and the second quantum dot package layer, wherein the first quantum dot package layer is arranged between the light emitting device and the second quantum dot package layer, and wherein the third wavelength is shorter than the second wavelength, and longer than the first wavelength.

10. A liquid crystal display device comprising:

a backlight module; and

a liquid crystal display panel arranged above the backlight module;

wherein the backlight module comprises a quantum dot light emitting device, wherein the quantum dot light emitting device comprises a light emitting device configured to generate exciting light at a first wavelength, a first quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a second wavelength, and a second quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a third wavelength, wherein the first quantum dot package layer is arranged between the light emitting device and the second quantum dot package layer, wherein the third wavelength is shorter than the second wavelength, and longer than the first wavelength, and wherein a shortest distance between opposite surfaces of the first quantum dot package layer and the light emitting device is more than 3 mm.

11. The liquid crystal display device according to claim 10, wherein inner and outer surfaces of the first quantum dot package layer and the second quantum dot package layer are arc-shaped, wherein the outer surfaces protruding outward are light exit surfaces, and wherein the inner surfaces protruding inward are light incident surfaces.

12. The liquid crystal display device according to claim 11, wherein the quantum dot light emitting device further comprises a circuit board on which the light emitting device is arranged, and wherein the first quantum dot package layer and the second quantum dot package layer are connected with the circuit board, and disposed around the light emitting device.

13. The liquid crystal display device according to claim 10, wherein the quantum dot light emitting device further comprises a dichroism component arranged between the first quantum dot package layer and the second quantum dot package layer, and wherein the dichroism component is configured to transmit the light at the first wavelength and the light at the second wavelength, and reflect the light at the third wavelength.

14. The liquid crystal display device according to claim 10, wherein the quantum dot light emitting device further comprises a diffusing particle layer disposed on a side of the first quantum dot package layer proximate to the light emitting device.

15. A quantum dot light emitting device comprising:

a light emitting device configured to generate exciting light at a first wavelength;

a first quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a second wavelength;

a second quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a third wavelength; and

a diffusing particle layer disposed on a side of the first quantum dot package layer proximate to the light emitting device;

wherein the first quantum dot package layer is arranged between the light emitting device and the second quantum dot package layer, and wherein the third wavelength is shorter than the second wavelength, and longer than the first wavelength.

16. A liquid crystal display device comprising:

a backlight module; and

a liquid crystal display panel arranged above the backlight module;

wherein the backlight module comprises a quantum dot light emitting device, wherein the quantum dot light emitting device comprises a light emitting device configured to generate exciting light at a first wavelength, a first quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a second wavelength, a second quantum dot package layer configured to absorb the exciting light at the first wavelength, and generate converted light at a third wavelength, and a diffusing particle layer disposed on a side of the first quantum dot package layer proximate to the light emitting device, wherein the first quantum dot package layer is arranged between the light emitting device and the second quantum dot package layer, and wherein the third wavelength is shorter than the second wavelength, and longer than the first wavelength.