Display device with quantum dot phosphor and manufacturing method thereof

• US 8,269,411 B2
• Filed: 10/07/2010
• Issued: 09/18/2012
• Est. Priority Date: 12/30/2009
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Yu, Yi-Cheng, Wang, Chih-Lin, Liu, Ru-Shi, Lin, Chun-Che
• Primary Examiner(s): Santiago, Mariceli
• Application Number:
  US12/899,841
• Publication Number:
  US 20110156575A1
• Time in Patent Office: 712 Days
• Field of Search: 313498-512, 313110-112, 313483-487, 445/24, 445/25, 257 98-100
• US Class Current: 313/501
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C09K 11/565 with zinc cadmium
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133603 with LEDs

Abstract

A display device and a method of manufacturing the same are provided. The display device includes an illuminate unit and a color filter. The illuminate unit has a light-emitting chip and a plurality of quantum dot phosphors for generating a color light which has an optical spectrum including the first blue peak wavelength, a first green peak wavelength, and a first red peak wavelength. The color filter is disposed in the light path of the color light, wherein the color filter has a transmittance spectrum having a second blue peak wavelength, a second green peak wavelength, and a second red peak wavelength. The first blue peak wavelength, the first green peak wavelength, and the first red peak wavelength respectively match the second blue peak wavelength, the second green peak wavelength, and the second red peak wavelength in order to enhance the color performance of the display device.

Claims

1. A display device, comprising:

an illumination unit having a light-emitting chip and a plurality of quantum dot phosphors, wherein the light-emitting chip emits light to excite the quantum dot phosphors to generate a color light, the color light has an optical spectrum having a first blue peak, a first green peak, and a first red peak, and at each peak value each peak has a respective wavelength, including a first blue peak wavelength, a first green peak wavelength, and a first red peak wavelength; and

a color filter, disposed in a light path of the illumination unit, for filtering the color light, wherein a transmittance spectrum of the color filter has a second blue peak, a second green peak, and a second red peak, and at each peak value each peak has a respective wavelength, including a second blue peak wavelength, a second green peak wavelength, and a second red peak wavelength;

wherein a ratio of the first blue peak wavelength to the second blue peak wavelength is between 0.96 and 1.04, a ratio of the first green peak wavelength to the second green peak wavelength is between 0.95 and 1.05, a ratio of the first red peak wavelength to the second red peak wavelength is between 0.82 and 1.21.

2. The display device of claim 1, wherein a ratio of a full width at half maximum of the first green peak to that of the second green peak is smaller than 0.45.

3. The display device of claim 1, wherein a ratio of a full width at half maximum of the first red peak to that of the second red peak is smaller than 0.25.

4. The display device of claim 1, wherein a full width at half maximum of the first blue peak, of the first green peak, and of the first red peak are smaller than 50 nm.

5. The display device of claim 1, wherein the first blue wavelength is between 440 nm and 457 nm, and the second blue wavelength is between 440 nm and 457 nm.

6. The display device of claim 1, wherein the first green wavelength is between 510 nm and 535 nm, and the second green wavelength is between 510 nm and 535 nm.

7. The display device of claim 1, wherein the first red wavelength is between 640 nm and 780 nm, and the second red wavelength is between 640 nm and 780 nm.

8. The display device of claim 1, wherein a material of the quantum dot phosphor is CdSe, and a diameter of the quantum dot phosphor is between 2.3 nm and 5.5 nm.

9. The display device of claim 1, wherein at least one of the quantum dot phosphors has a core and a layer covering the core.

10. The display device of claim 9, wherein a material of the core of the quantum dot phosphor is CdSe, a diameter of the core is between 2.3 nm and 5.5 nm, and a material of the layer of the quantum dot phosphor is ZnS, a thickness of the layer of the quantum dot phosphor is between 0.2 nm and 1.7 nm.

11. A manufacturing method of a display device, comprising:

providing a color filter having a plurality of color resists, wherein the transmittance spectrum of the color filter has a second blue peak, a second green peak, and a second red peak, and at each peak value each peak has a respective wavelength, including a second blue peak wavelength, a second green peak wavelength, and a second red peak wavelength;

providing an illumination unit having a light-emitting chip and a plurality of quantum dot phosphors, wherein the light-emitting chip emits light to excite the quantum dot phosphors to generate a color light, the color light has an optical spectrum having a first blue peak, a first green peak, and a first red peak, and at each peak value each peak has a respective wavelength, including a first blue peak wavelength, a first green peak wavelength, and a first red peak wavelength; and

adjusting the transmittance spectrum of the color filter in a manner that a ratio of the first blue peak wavelength to the second blue peak wavelength is between 0.96 and 1.04, a ratio of the first green peak wavelength to the second green peak wavelength is between 0.95 and 1.05, and a ratio of the first red peak wavelength to the second red peak wavelength is between 0.82 and 1.21.

12. The manufacturing method of claim 11, wherein the step of adjusting the transmittance spectrum of the color filter includes adjusting the thickness of the color resist.

13. The manufacturing method of claim 11, wherein the step of adjusting the transmittance spectrum of the color filter includes adjusting the material of the color resist.

14. A manufacturing method of a display device, comprising:

providing a color filter having a plurality of color resists, wherein the transmittance spectrum of the color filter has a second blue peak, a second green peak, and a second red peak, and at each peak value each peak has a respective wavelength, including a second blue peak wavelength, a second green peak wavelength, a second red peak wavelength;

providing an illumination unit having a light-emitting chip and a plurality of quantum dot phosphors, wherein the light-emitting chip emits light to excite the quantum dot phosphors to generate a color light, the color light has an optical spectrum having a first blue peak, a first green peak, and a first red peak, the first blue peak, and at each peak value each peak has a respective wavelength, including a first blue peak wavelength, a first green peak wavelength, and a first red peak wavelength; and

adjusting the optical spectrum of the color light in a manner that a ratio of the first blue peak wavelength to the second blue peak wavelength is between 0.96 and 1.04, a ratio of the first green peak wavelength to the second green peak wavelength is between 0.95 and 1.05, and a ratio of the first red peak wavelength to the second red peak wavelength is between 0.82 and 1.21.

15. The manufacturing method of claim 14, wherein the step of adjusting the optical spectrum of the color light includes adjusting a diameter of the quantum dot phosphor.

16. The manufacturing method of claim 14, wherein the step of adjusting the optical spectrum of the color light includes adjusting a material of the quantum dot phosphor.

17. The manufacturing method of claim 14, wherein the step of adjusting the optical spectrum of the color light includes:

forming a core; and

forming a layer covering the core to form one of the quantum dot phosphors.

18. A display device, comprising:

an illumination unit having a light-emitting chip and a plurality of quantum dot phosphors, wherein the light-emitting chip emits light to excite the quantum dot phosphors to generate a color light, the color light has an optical spectrum having a first blue peak, a first green peak, and a first red peak, and at each peak value each peak has a respective wavelength, including a first blue peak wavelength, a first green peak wavelength, and a first red peak wavelength; and

a color filter, disposed in a light path of the illumination unit, for filtering the color light, wherein a transmittance spectrum of the color filter has a second blue peak, a second green peak, and a second red peak, and at each peak value each peak has a respective wavelength, including a second blue peak wavelength, a second green peak wavelength, and a second red peak wavelength;

wherein the first blue peak wavelength, the first green peak wavelength, and the red peak wavelength respectively match with the second blue peak wavelength, the second green peak wavelength, and the second red peak wavelength.

19. The display device of claim 18, wherein a ratio of the first blue peak wavelength to the second blue peak wavelength is between 0.96 and 1.04.

20. The display device of claim 18, wherein a ratio of the first green peak wavelength to the second green peak wavelength is between 0.95 and 1.05.

21. The display device of claim 18, wherein a ratio of the first red peak wavelength to the second red peak wavelength is between 0.82 and 1.21.