Display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10295146-B2
Application number	US-201514957070-A
Country	US
Kind code	B2
Filing date	Dec 2, 2015
Priority date	Feb 9, 2015
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A display device includes a display panel and a backlight unit. The display panel receives a light to display an image and has a first radius of curvature. The backlight unit is disposed under the display panel to provide the light to the display panel and has a second radius of curvature. The backlight unit includes a plurality of light sources and a plurality of scattering units. The light sources emit the light and the scattering units scatter at least a portion of the light.

First claim

What is claimed is:

1. A display device comprising:
a display panel having a first radius of curvature, responding to light by displaying variable visual images; and
a backlight unit disposed providing the light to the display panel, the backlight unit having a second radius of curvature,
the backlight unit comprises:
a plurality of light sources emitting the light; and
a plurality of scattering units scattering at least a portion of the light,

wherein:
a distance of arc between the light sources arranged in a first direction being in a range from about 80 mm to about 120 mm; and
the distance (D 1 ) of arc between the light sources arranged in the first direction and the first radius of curvature (R 1 ) satisfying a relational formula of 1/50≤D 1 /R 1 ≤ 3/50.

2. The display device of claim 1 , the scattering units being sandwiched between the light sources arranged in a matrix form along a first direction and a second direction substantially perpendicular to the first direction when viewed in a thickness direction of the display panel.

3. The display device of claim 2 , when viewed in the thickness direction of the display panel, the light sources comprised of:
a first light source;
a second light source spaced apart from the first light source in the first direction;
a third light source spaced apart from the first light source in the second direction; and
a fourth light source spaced apart from the third light source in the first direction,
at least one scattering unit of the scattering units being sandwiched between the first, second, third, and fourth light sources.

4. The display device of claim 1 , the light sources being arranged in a matrix form along a first direction and a third direction when viewed in a thickness direction of the display panel,
the third direction crosses each of the first direction and a second direction which is substantially perpendicular to the first direction, and
the scattering units being sandwiched between the light sources.

5. The display device of claim 4 , when viewed in a thickness direction of the display panel, the light sources comprising:
a first light source;
a second light source spaced apart from the first light source in the first direction;
a third light source spaced apart from the first light source in the third direction; and
a fourth light source spaced apart from the third light source in the first direction,
at least one scattering unit of the scattering units being sandwiched between the first, second, third, and fourth light sources.

6. The display device of claim 1 , when viewed in a thickness direction of the display panel, comprising:
the light sources being disposed to correspond to vertices of a parallelogram, and
the scattering units being disposed inside the parallelogram.

7. The display device of claim 6 , comprised of the scattering units overlapping a cross point of diagonal lines of the parallelogram.

8. The display device of claim 1 , comprised of each of the scattering units having a thickness greater than a thickness of each of the light sources.

9. The display device of claim 1 , comprised of a number of the scattering units being smaller than a number of the light sources.

10. The display device of claim 1 , comprised of each of the scattering units comprising at least one of:
at least one metal selected from the group consisting of gold, silver, aluminum, platinum, palladium, cobalt, ruthenium, copper, indium, nickel, and iron;
an alloy of at least one metal selected from the group consisting of gold, silver, aluminum, platinum, palladium, cobalt, ruthenium, copper, indium, nickel, and iron;
TiO2; SiO2; BaSO4; and CaCO3.

11. The display device of claim 1 , comprised of each of the scattering units comprising at least one of polycarbonate (PC), polyethyleneterephthalate (PET), polyethylene (PE), polypropylene (PP), polysulfone (PSF), polymethylmethacrylate (PMMA), triacetylcellulose (TAC), cycloolefin (COP), and cycloolefin copolymer (COC).

12. The display device of claim 1 , the backlight unit further comprising:
a reflection sheet disposed under the light sources and the scattering units to reflect at least a portion of the light; and
a diffusion plate disposed on the light sources and the scattering units to diffuse the light, wherein a vertical distance (H 1 ) between the diffusion plate and the reflection sheet and the distance (D 1 ) of arc between the light sources arranged in the first direction satisfy a relational formula of 6.5≤H 1 /D 1 ≤9.0.

13. The display device of claim 2 , when viewed in a thickness direction of the display panel, comprised of the scattering units being symmetrically disposed with respect to the light sources.

14. The display device of claim 2 , when viewed in a thickness direction of the display panel, comprised of the scattering units being non-symmetrically disposed with respect to the light sources.

15. A method of manufacturing a display device, comprising:
preparing a display panel having a first radius of curvature; and
providing a backlight unit having a second radius of curvature under the display panel,
the providing the backlight unit comprised of providing a plurality of light sources and a plurality of scattering units,
wherein:
a distance of arc between the light sources arranged in a first direction being in a range from about 80 mm to about 120 mm; and
the distance (D 1 ) of arc between the light sources arranged in the first direction and the first radius of curvature (R 1 ) satisfying a relational formula of 1/50≤D 1 /R 1 ≤ 3/50.

16. The method of claim 15 , the provision of the light sources and the scattering units comprising:
providing the light sources in a matrix form along a first direction and along a second direction substantially perpendicular to the first direction when viewed in a thickness direction of the display panel; and
providing the scattering units sandwiched between the light sources.

17. The method of claim 15 , the provision of the light sources and the scattering units comprising:
providing the light sources in a matrix form along a first direction and along a third direction when viewed in a thickness direction of the display panel; and
providing the scattering units sandwiched between the light sources,
the third direction crossing each of the first direction and a second direction, the second direction being substantially perpendicular to the first direction.

18. The method of claim 15 , the provision of the backlight unit further comprising:
providing a reflection sheet under the light sources and the scattering units; and
providing a diffusion plate on the light sources and on the scattering units, wherein a vertical distance (H 1 ) between the diffusion plate and the reflection sheet and the distance (D 1 ) of arc between the light sources arranged in the first direction satisfies a relational formula of 6.5≤H 1 /D 1 ≤9.0.

19. A display device comprising:
a display panel having a first radius of curvature, responding to light by displaying variable visual images; and
a backlight unit disposed under the display panel to provide the light to the display panel, the backlight unit having a second radius of curvature, the backlight unit comprising:
a plurality of light sources emitting the light; and
a plurality of scattering units having curved bottoms, scattering at least a portion of the light,
wherein:
a distance of arc between the light sources arranged in a first direction being in a range from about 80 mm to abo

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Kang-Woo
• Kim Dawoon
• Kim Yu-Dong
• Song Hyun-Hwa
• Shin Myeong-Ju
• Chung Seunghwan

Classifications

• G02B5/0278

  used in transmission · CPC title

• G02F1/133606 Primary

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F1/133611

  including means for improving the brightness uniformity · CPC title

• F21Y2105/00

  Planar light sources · CPC title

• G02F1/133603 Primary

  with LEDs · CPC title