Backlight unit, display device, and method of manufacturing display device

Patent metadata

Field	Value
Publication number	US-10845647-B2
Application number	US-201816042613-A
Country	US
Kind code	B2
Filing date	Jul 23, 2018
Priority date	Aug 16, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A display device includes a backlight unit and a display panel disposed above the backlight unit, where the backlight unit includes a light guide plate, a housing which is disposed at one side of the light guide plate and accommodates a wavelength converting member, and a flexible glass film which covers one side of the housing, and a first laser welding part is disposed between the flexible glass film and the housing.

First claim

What is claimed is:

1. A backlight unit comprising:
a light guide plate;
a housing which is disposed at one side of the light guide plate and accommodates a wavelength converting member; and
a flexible glass film which covers one side of the housing,
wherein a first laser welding part is disposed between the flexible glass film and the housing.

2. The backlight unit of claim 1 , wherein the flexible glass film includes:
a cover portion which covers the one side of the housing;
a spaced-apart portion overlapping the light guide plate and spaced apart from the light guide plate; and
a contact portion contacting the light guide plate.

3. The backlight unit of claim 2 , wherein the spaced-apart portion is curved with a predetermined curvature.

4. The backlight unit of claim 2 , wherein a second laser welding part is disposed between the light guide plate and the contact portion.

5. The backlight unit of claim 4 , wherein the second laser welding part includes a plurality of welding dots.

6. The backlight unit of claim 4 , wherein the second laser welding part includes a first line and a second line which extend in parallel to each other and include a plurality of welding dots or a welding line.

7. The backlight unit of claim 1 , wherein a thickness of the flexible glass film is in a range of about 5 micrometers to about 50 micrometers.

8. The backlight unit of claim 1 , wherein the first laser welding part includes a continuous welding line.

9. The backlight unit of claim 1 , wherein a second laser welding part is disposed between the light guide plate and the housing.

10. The backlight unit of claim 1 , wherein the wavelength converting member includes a plurality of sub-wavelength converting members, and the flexible glass film includes a plurality of sub-flexible glass films corresponding to the plurality of sub-wavelength converting members.

11. A display device comprising:
a backlight unit; and
a display panel disposed above the backlight unit, wherein the backlight unit includes:
a light guide plate;
a housing which is disposed at one side of the light guide plate and accommodates a wavelength converting member; and
a flexible glass film which covers one side of the housing, and
a first laser welding part is disposed between the flexible glass film and the housing.

12. The display device of claim 11 , wherein the flexible glass film includes:
a cover portion which covers the one side of the housing;
a spaced-apart portion overlapping the light guide plate and spaced apart from the light guide plate; and
a contact portion contacting the light guide plate.

13. The display device of claim 12 , wherein a second laser welding part is disposed between the light guide plate and the contact portion.

14. The display device of claim 11 , wherein a thickness of the flexible glass film is in a range of about 5 micrometers to about 50 micrometers.

15. The display device of claim 11 , wherein the first laser welding part includes a continuous welding line.

16. The display device of claim 11 , wherein a second laser welding part is disposed between the light guide plate and the housing.

17. The display device of claim 11 , wherein:
the display panel includes a first substrate and a second substrate facing each other; and
the flexible glass film includes a cover portion which covers the one side of the housing and a panel contact portion extending from the cover portion and welded to the first substrate.

18. A method of manufacturing a display device, the method comprising:
preparing a light guide plate and a housing which is disposed at one side of the light guide plate and accommodates a wavelength converting member; and
placing a flexible glass film at one side of the housing and welding the housing and the flexible glass film using a femtosecond laser.

19. The method of claim 18 , wherein:
the flexible glass film includes a cover portion welded to the housing, a spaced-apart portion extending from the cover portion, and a contact portion extending from the spaced-apart portion and contacting the light guide plate; and
the method further comprises welding the light guide plate and the contact portion using a femtosecond laser.

20. The method of claim 18 , further comprising welding the light guide plate and the housing using a femtosecond laser.

21. The backlight unit of claim 1 , wherein the housing further includes a cover glass disposed at the one side, and the first laser welding part is disposed between the cover glass and the flexible glass film.

Assignees

• Samsung Display Co Ltd

Inventors

• Seo Woo Suk
• Kim Sung Chul
• Kim Won Jin
• Kim Jung Hyun
• Nam Seok Hyun
• Song Si Joon
• Choi Kwang Wook

Classifications

• G02B6/0033

  Means for improving the coupling-out of light from the light guide · CPC title

• G02B6/0013 Primary

  Means for improving the coupling-in of light from the light source into the light guide (coupling light into light guides in general G02B6/42) · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02F1/133614

  using photoluminescence, e.g. phosphors illuminated by UV or blue light · CPC title

• G02F1/133331

  Cover glasses · CPC title