Light emitting diode package, method of fabricating the same, and display apparatus having the same

Patent metadata

Field	Value
Publication number	US-9235082-B2
Application number	US-201113231816-A
Country	US
Kind code	B2
Filing date	Sep 13, 2011
Priority date	Mar 31, 2011
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A light emitting diode package, a method of fabricating the same, and a display apparatus having the same are provided. The light emitting diode package includes a light emitting diode, a quantum dot layer, a band pass filter, disposed in a housing. The light emitting diode emits light of a first color. The quantum dot layer includes a plurality of quantum dots disposed on the light emitting diode to absorb a portion of the light emitted by the diode, and then emit light of a second color. The band pass filter is disposed on the quantum dot layer and has a first pass band corresponding to the light emitted from the diode and a second pass band corresponding to the light emitted from the quantum dots.

First claim

What is claimed is:

1. A display apparatus comprising:
a backlight unit comprising a first light emitting diode package; and
a display panel configured to display an image,
wherein the first light emitting diode package comprises:
a first light emitting diode configured to emit a first wavelength light; and
a first quantum dot layer comprising first quantum dots and second quantum dots,
wherein the first quantum dot layer is disposed on the first light emitting diode, the first quantum dots absorb the first wavelength light and emit a second wavelength light and the second quantum dots absorb the first wavelength light and emit a third wavelength light, wherein the first quantum dots and the second quantum dots are mixed together and dispersed within the first quantum layer,
wherein the first wavelength light has a first peak wavelength that is shifted to one side of a spectral band of a first color, wherein the second wavelength light has a second peak wavelength that is shifted to one side of a spectral band a second color, and wherein the third wavelength light has a third peak wavelength that is shifted to one side of a spectral band of a third color, and
wherein an amount of a wavelength shift of the second peak wavelength and the third peak wavelength is adjustable by a size of the first quantum dots and the second quantum dots.

2. The display apparatus of claim 1 , further comprising an air layer disposed between the first quantum dot layer and the first light emitting diode.

3. The display apparatus of claim 1 , wherein the first wavelength light comprises a first blue light that is shifted left from a peak wavelength of a blue color, the second wavelength light comprises a first green light that is shifted left from a peak wavelength of a green color, and the third wavelength light comprises a first red light that is shifted left from a peak wavelength of a red color.

4. The display apparatus of claim 3 , further comprising a second light emitting diode package, wherein the second light emitting diode package comprises:
a second light emitting diode configured to emit a fourth wavelength light; and
a second quantum dot layer comprising third quantum dots and fourth quantum dots, wherein the second quantum dot layer is disposed on the second light emitting diode, the third quantum dots absorb the fourth wavelength light and emit a fifth wavelength light and the fourth quantum dots absorb the second wavelength light and emit a sixth wavelength light.

5. The display apparatus of claim 4 , wherein the fourth wavelength light comprises a second blue light, the fifth wavelength light comprises a second green light, and the sixth wavelength light comprises a second red light.

6. The display apparatus of claim 5 , wherein the first and second blue light have wavelengths ranging from about 425 nm to about 475 nm,
the first and second green light have wavelengths ranging from about 500 nm to about 550 nm, and
the first and second red light have wavelengths ranging from about 600 nm to about 650 nm.

7. The display apparatus of claim 5 , wherein the first and second blue pass bands transmit wavelengths in a range from about 400 nm to about 500 nm,
the first and second green pass bands transmit wavelengths in a range from about 500 nm to about 580 nm, and
the first and second red pass bands transmit wavelengths in a range from about 580 nm to about 700 nm.

8. The display apparatus of claim 5 , wherein the first light emitting diode package emits a first light and the second light emitting diode package emits a second light that has a different light intensity from the first light,
the backlight unit alternately emits the first light and the second light, and
the display panel receives the first light and the second light to display a three-dimensional image.

9. The display apparatus of claim 5 , wherein the backlight unit comprises a light guide plate guiding the first light and the second light to the display panel, a first printed circuit board disposed adjacent to a first side of the light guide plate, and a second printed circuit board disposed adjacent to a second side of the light guide plate, and
each of the first and second printed circuit boards includes a plurality of light emitting diode packages.

10. The display apparatus of claim 5 , wherein
the second blue light is shifted to an opposite side of the spectral band of the blue color, second green light that is shifted to an opposite side of the spectral band of the green color, and the second red light that is shifted to an opposite side of the spectral band of the red color.

11. The display apparatus of claim 10 , wherein an interval between the first peak wavelength of the first blue light and the fourth peak wavelength of the second blue light is at least a full width at half maximum (FWHM) of one of the first and second blue light,
an interval between the second peak wavelength of the first green light and the fifth peak wavelength of the second green light is at least a FWHM of one of the first and second green light, and
an interval between the third peak wavelength of the first red light and the sixth peak wavelength of the second red light is at least a FWHM of one of the first and second red light.

12. the display apparatus of claim 4 , further comprising:
a second band pass filter disposed on the second quantum dot layer; and
a second housing receiving the second light emitting diode, the second quantum dot layer, and the second band pass filter.

13. The display apparatus of claim 6 , wherein each of the first and second quantum dot layers has a thickness of about 100 nm to about 1,000 μm.

14. The display apparatus of claim 1 , further comprising:
a first band pass filter disposed on the first quantum dot layer; and
a first housing receiving the first light emitting diode, the first quantum dot layer, and the first band pass filter.

15. The display apparatus of claim 1 , wherein each of the first quantum dots and the second quantum dots has a core formed of a first material having a first band gap, a shell surrounding the core and formed of a second material having a second band gap that is larger than the first band gap.

16. A display apparatus comprising:
a first light emitting diode package; and
a second light emitting diode package;
wherein the first light emitting diode package comprises a first light emitting diode configured to emit a first wavelength light and a first quantum dot layer comprising first quantum dots and second quantum dots that are mixed together and dispersed within the first quantum layer,
wherein the first quantum dots absorb the first wavelength light and emit a second wavelength light and the second quantum dots absorb the first wavelength light and emit a third wavelength light,
wherein the second light emitting diode package comprises a second light emitting diode configured to emit a fourth wavelength light and a second quantum dot layer comprising third quantum dots and fourth quantum dots that are mixed together and dispersed within the second quantum layer,
wherein the third quantum dots absorb the fourth wavelength light and emit a fifth wavelength light and the fourth quantum dots absorb the second wavelength light and emit a sixth wavelength light;
wherein the first wavelength light has a first peak wavelength that is shifted to one side of a spectral band of a first color, wherein the second wavelength light has a second peak wavelength that is shifted to one side of a spectral band of a second color, and wherein the third wavelength light has a thir

Assignees

• Shin Myeong-Ju
• Jung Jaewoo
• Kim Youngsic
• Baek Seung Hwan
• Lee Yeongbae
• Samsung Display Co Ltd

Inventors

• Shin Myeong-Ju
• Jung Jaewoo
• Kim Youngsic
• Baek Seung Hwan
• Lee Yeongbae

Classifications

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F1/133621

  providing coloured light (G02F1/133617, G02F1/133533 take precedence) · CPC title

• G02F1/1336 Primary

  Illuminating devices · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• H10H20/8515

  not being in contact with the bodies · CPC title