Member for backlight unit using quantum dots and method of manufacturing the same

• US 9,188,310 B2
• Filed: 02/07/2011
• Issued: 11/17/2015
• Est. Priority Date: 08/16/2010
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Kang, Mun Suk
• Primary Examiner(s): Truong, Bao Q
• Application Number:
  US13/817,404
• Publication Number:
  US 20130194783A1
• Time in Patent Office: 1,744 Days
• Field of Search: 362/84, 362 971- 974, 427/67, 257/13, 257/79
• US Class Current: 1/1
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: Y10S 977/774 Exhibiting three-dimensional carrier confinement, e.g. quantum dots
• CPC Class Codes: Y10S 977/952 Display

Abstract

A member for a backlight unit using quantum dots is provided comprising a frame where a blue LED is mounted and a light transmitting layer over the frame, wherein the light transmitting layer includes a quantum dot.

Claims

1. A member for a backlight unit using quantum dots comprising:

a frame including a top surface and a concave portion lower than the top surface;

a plurality of blue LEDs mounted on the concave portion;

a light transmitting layer including a high molecular material and quantum dots buried in the high molecular material, the light transmitting layer having a first surface and a second surface opposite the first surface; and

a light guide spaced from the light transmitting layer,

wherein the light transmitting layer is spaced from the top surface of the frame out of the concave portion, and

wherein the light transmitting layer is between the plurality of blue LEDs and the light guide so that the plurality of blue LEDs are adjacent the first surface of the light transmitting layer to direct light into the first surface and the light guide is adjacent the second surface of the light transmitting layer to receive light emitted from the second surface.

2. The member for a backlight unit of claim 1, wherein the quantum dot includes one or more of a red quantum dot and a green quantum dot that is smaller than the red quantum dot.

3. The member for a backlight unit of claim 1, wherein a diameter of the quantum dot ranges from 2 nm to 5 nm.

4. The member for a backlight unit of claim 1, wherein the high molecular material is a polymer resin that includes one or more of a silicon resin, an epoxy resin, and an acrylic resin.

13. The member for a backlight unit of claim 2, wherein a diameter of the quantum dot ranges from 2 nm to 5 nm.

14. The member for a backlight unit of claim 2, wherein the light transmitting layer includes the quantum dot in a polymer resin.

15. The member for a backlight unit of claim 14, wherein the polymer resin includes one or more of a silicon resin, an epoxy resin, and an acrylic resin.

17. The member for a backlight unit of claim 1, wherein the light transmitting layer contacts the top surface of the frame.

18. The member for a backlight unit of claim 1, wherein the light transmitting layer is located on the top surfaces of at least two frames.

19. The member for a backlight unit of claim 18, wherein the light transmitting layer contacts the top surfaces of the two frames.

20. The member for a backlight unit of claim 1, wherein the thickness of the high molecular material ranges from 1 μ

m to 1 mm.

5. A method of manufacturing a member for a backlight unit using quantum dots, the method comprising:

mixing a high molecular resin with a quantum dots solution so that the quantum dots solution is dispersed in the high molecular resin;

printing the mixture on a substrate to have a predetermined thickness;

curing the printed mixture, cutting the cured mixture to a predetermined shape, and removing the substrate to form a light transmitting layer, the light transmitting layer having a first surface and a second surface opposite the first surface;

mounting the light transmitting layer on a frame including a top surface and a concave portion lower than the top surface;

positioning a light guide spaced from the light transmitting layer on a side opposite the frame; and

positioning the light transmitting layer between the plurality of blue LEDs and the light guide so that the plurality of blue LEDs are adjacent the first surface of the light transmitting layer to direct light into the first surface and the light guide is adjacent the second surface of the light transmitting layer to receive light emitted from the second surface,

wherein a plurality of blue LEDs is mounted on the concave portion, and

wherein the light transmitting layer is spaced from the top surface of the frame out of the concave portion.

6. The method of claim 5, wherein the quantum dot includes one or more of a red quantum dot and a green quantum dot that is smaller than the red quantum dot.

7. The method of claim 5, wherein a diameter of the quantum dot ranges from 2 nm to 5 nm.

8. The method of claim 5, wherein the quantum dot has one of a circular shape, a triangular shape, a rectangular shape, and an elliptical shape, or quantum dots having two or more shapes among the circular shape, the triangular shape, the rectangular shape, and the elliptical shape are contained.

9. The method of claim 5, wherein the high molecular resin is a polymer resin that includes one or more of a silicon resin, an epoxy resin, and an acrylic resin.

10. The method of claim 5, wherein the substrate is a glass substrate.

11. The method of claim 5, wherein the thickness of the quantum dot solution-mixed polymer resin distributed on the substrate ranges from 1 μ

m to 1 mm.

12. The method of claim 5, wherein curing the printed mixture is performed at a temperature of 50°

C. to 200°

C. for 1 to 24 hours.

16. The method of claim 6, wherein a diameter of the quantum dot ranges from 2 nm to 5 nm.