Light source unit, display device including the light source unit, and manufacturing method of the display device

Patent metadata

Field	Value
Publication number	US-10578790-B2
Application number	US-201815863878-A
Country	US
Kind code	B2
Filing date	Jan 6, 2018
Priority date	Jan 11, 2017
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

A light source unit includes: a light source circuit board; light sources disposed on the light source circuit board and which emit light; a wavelength converter disposed on the light sources to be spaced apart from the light sources and to partially overlap with the light sources; a first glass disposed between the light sources and the wavelength converter; and a second glass disposed on the wavelength converter and at least partially in direct contact with, and coupled to, the first glass.

First claim

What is claimed is:

1. A light source unit, comprising:
a light source circuit board;
light sources disposed on the light source circuit board and which emit light;
a wavelength converter disposed on the light sources to be spaced apart from the light sources and to partially overlap with the light sources;
a first glass disposed between the light sources and the wavelength converter; and
a second glass disposed on the wavelength converter and at least partially in direct contact with, and coupled to, the first glass,
wherein the first glass and the second glass are at least partially fused to each other where a physical interface between the first glass and the second glass directly contacting each other does not exist, and
wherein any other material except for the first glass and the second glass is absent at a portion where the second glass is coupled to the first glass.

2. The light source unit of claim 1 , wherein the contact surface between the first glass and the second glass includes:
a first portion where the physical interface between the first glass and the second glasses exists;
a second portion where the physical interface between the first glass and the second glass does not exist; and
a third portion overlapping with the wavelength converter.

3. The light source unit of claim 2 , wherein
the wavelength converter is in contact with the first glass or the second glass,
the wavelength converter is completely surrounded by the first glass and the second glass,
the first portion, the second portion and the third portion of the contact surface between the first glass and the second glass are on a same level as each other, and
the first portion is disposed between the second portion and the third portions.

4. The light source unit of claim 2 , wherein
a first surface of the first glass facing to the second glass has a concave groove, and
the wavelength converter is received in the concave groove.

5. The light source unit of claim 4 , further comprising:
a third glass disposed between the light sources and the first glass and at least partially in direct contact with, and coupled to, the first glass,
wherein
the third glass is in direct contact with the light source circuit board, and
the light sources are sealed by the third glass and the light source circuit board.

6. The light source unit of claim 4 , wherein
a gap is defined between the wavelength converter and the second glass.

7. The light source unit of claim 2 , wherein
a first surface of the second glass facing to the first glass has a concave groove, and
the wavelength converter is received in the concave groove.

8. The light source unit of claim 7 , further comprising:
a third glass disposed between the light sources and the first glass and at least partially in direct contact with, and coupled to, the first glass,
wherein
the third glass is in direct contact with the light source circuit board, and
the light sources are sealed by the third glass and the light source circuit board.

9. The light source unit of claim 7 , wherein
a gap is defined between the first glass and the wavelength converter.

10. The light source unit of claim 2 , wherein
a seed-like shaped structure exists in the second portion,
the seed-like shaped structure has a long axis and a short axis,
the short axis is arranged in substantially parallel to the contact surface between the first glass and the second glass, and
a width of the second portion is in a range of about 60 micrometers to 120 mircometers.

11. The light source unit of claim 1 , wherein
the light sources are disposed to be spaced apart from one another in a first direction, and
a width of the wavelength converter in a second direction, which intersects the first direction, is 1.2 to 2 times greater than a width of the light sources in the second direction.

12. The light source unit of claim 1 , wherein
the light sources emit light having a blue wavelength,
the wavelength converter comprises:
a resin material; and
a wavelength conversion material dispersed in the resin material, and
the wavelength conversion material of the wavelength converter consists essentially of a red wavelength conversion material and a green wavelength conversion material.

13. The light source unit of claim 1 , further comprising:
a green wavelength conversion material dispersed in the first glass,
wherein
the light sources emit light having a blue wavelength,
the wavelength converter includes a resin material and a wavelength conversion material dispersed in the resin material, and
the wavelength conversion material of the wavelength converter consists essentially of a red wavelength conversion material.

14. A display device, comprising:
a light guide plate having a light-entering side and a light-exiting side;
a light source unit disposed on the light-entering side of the light guide plate; and
a display panel disposed on the light-exiting side of the light guide plate,
wherein the light source unit comprises:
light sources which emit light;
a wavelength converter disposed between the light sources and the light guide plate to be spaced apart from the light sources;
a first glass disposed between the light sources and the wavelength converter; and

a second glass disposed between the wavelength converter and the light guide plate and at least partially in direct contact with, and coupled to, the first glass,
wherein the first glass and the second glass are at least partially fused to each other where a physical interface between the first glass and the second glass directly contacting each other does not exist, and
wherein any other material except for the first glass and the second glass is absent at a portion where the second glass is coupled to the first glass.

15. The display device of claim 14 , wherein the display panel is supported by the light guide plate.

16. The display device of claim 15 , wherein
a bonding pattern is defined between the light guide plate and the display panel,
the light guide plate and the display panel are coupled to each other by the bonding pattern, and
in a plan view, the bonding pattern extends along edges of the light guide plate, but not along an edge corresponding to the light-entering side of the light guide plate.

17. The display device of claim 14 , wherein the light-entering side of the light guide plate and the second glass of the light source unit are in direct contact with, and coupled to, each other.

18. The display device of claim 17 , wherein
the contact surface between the second glass and the light guide plate comprises:
a first portion where the physical interface between the second glass and the light guide plate exists;
a second portion where the physical interface between the second glass and the light guide plate does not exist; and
a third portion overlapping with the wavelength converter, and
wherein the second portion is on a different level from the third portion.

Assignees

• Samsung Display Co Ltd

Inventors

• Son Young Hye
• Kwon Yong Hoon
• Kim Won Jin
• Seo Woo Suk
• Song Si Joon
• Choi Kwang Wook

Classifications

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02B6/009

  of the light source in the package (G02B6/0021 takes precedence) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• G02B6/0023 Primary

  provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source · CPC title