Backlight unit and display device including backlight unit

Patent metadata

Field	Value
Publication number	US-11860474-B2
Application number	US-202218079435-A
Country	US
Kind code	B2
Filing date	Dec 12, 2022
Priority date	Oct 31, 2014
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A display device including a display panel; a frame at a rear of the display panel; a plurality of light source assemblies between the display panel and the frame, the light source assemblies providing light for the display panel; and a reflecting sheet between the display panel and the frame and including a first sheet part forming a central area of the reflecting sheet; a second sheet part forming a side area of the reflecting sheet around the first sheet part, the second sheet including vertical dot areas formed on first and second vertical sides of the reflecting sheet and horizontal dot areas formed on first and second horizontal sides of the reflecting sheet; and a plurality of partial ring-shaped dot areas formed on the first sheet part partially around corresponding light source assemblies without completely surrounding the corresponding light source assemblies.

First claim

What is claimed is:

1. A display device comprising:
a display panel;
a frame at a rear of the display panel;
a plurality of light source assemblies between the display panel and the frame, the light source assemblies providing light for the display panel; and
a reflecting sheet between the display panel and the frame,
wherein the reflecting sheet includes:
a first sheet part forming a central area of the reflecting sheet;
a second sheet part forming a side area of the reflecting sheet around the first sheet part, the second sheet part including vertical dot areas formed on first and second vertical sides of the second sheet part and horizontal dot areas formed on first and second horizontal sides of the second sheet part; and
a plurality of partial ring-shaped dot areas formed on the first sheet part partially around corresponding light source assemblies without completely surrounding the corresponding light source assemblies.

2. The display device of claim 1 , wherein the light source assemblies include light sources mounted on substrates extending lengthwise on the first sheet part, and include lenses covering corresponding light sources, and
wherein outermost lenses comprise first outermost lenses areas on first and second horizontal sides of the first sheet part and comprise second outermost lenses on first and second vertical sides of the first sheet part.

3. The display device of claim 2 , wherein the partial ring-shaped dot areas are disposed in a direction facing the first and second horizontal sides of the second sheet part.

4. The display device of claim 2 , wherein the partial ring-shaped dot areas partially surround at least some inner lenses on the first sheet part that are disposed within the outermost lenses on the first sheet part.

5. The display device of claim 2 , wherein the partial ring-shaped dot areas comprises at least three rows of dots partially surrounding at least some of the outermost lenses on the first sheet part, and
wherein a size of dots in the at least three rows of dots are the same as each other.

6. The display device of claim 5 , wherein a first row of dots closest to a corresponding light source include dots spaced closer together than a second row of dots adjacent to the first row of dots.

7. The display device of claim 5 , wherein a density of a first row of dots closest to a corresponding light source is denser than a second row of dots adjacent to the first row of dots.

8. The display device of claim 2 , wherein each lens includes three legs for coupling the lens to the first sheet part.

9. The display device of claim 2 , wherein the reflecting sheet further comprises:
a supporter member configured to provide a separation between the reflecting sheet and a diffuser plate positioned above the reflecting sheet; and
a supporter dot area formed around the supporter on the first sheet part.

10. The display device of claim 9 , where the supporter is disposed between rows of the plurality of lens.

11. The display device of claim 2 , wherein the partial ring-shaped dot areas spread out in ring-shaped rows of dots away from a center of a corresponding light source.

12. The display device of claim 1 , wherein a surrounding area of a corresponding light source other than a corresponding partial ring-shaped dot area includes an empty dot area.

13. The display device of claim 12 , wherein the corresponding partial ring-shaped dot area and the empty dot area completely surround the corresponding light source.

14. The display device of claim 1 , wherein a size of dot in the partial ring-shaped dot areas are the same.

15. The display device of claim 1 , wherein a size of dots in the vertical dot areas are the same.

16. The display device of claim 1 , wherein a size of dots in the horizontal dot areas are the same.

17. The display device of claim 1 , wherein a size of dots in the horizontal dot areas are the same as a size of dots in the vertical dot areas.

18. The display device of claim 1 , wherein the second sheet part further comprises corner non-dot areas at corners of the second sheet part.

19. The display device of claim 1 , wherein the horizontal and vertical dot areas comprise a single band of dot rows having dots with a same size as each other.

20. A backlight unit comprising:
a plurality of light source assemblies; and
a reflecting sheet including:
a first sheet part forming a central area of the reflecting sheet;
a second sheet part forming a side area of the reflecting sheet around the first sheet part, the second sheet part including vertical dot areas formed on first and second vertical sides of the second sheet part and horizontal dot areas formed on first and second horizontal sides of the second sheet part; and
a plurality of partial ring-shaped dot areas formed on the first sheet part partially around corresponding light source assemblies without completely surrounding the corresponding light sources.

Assignees

• Lg Electronics Inc

Inventors

• Oh Sewon
• Kim Eunseok

Classifications

• G02F1/133603 Primary

  with LEDs · CPC title

• F21V7/04

  Optical design · CPC title

• G02F1/133605 Primary

  including specially adapted reflectors · CPC title

• G02F1/133606

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

• G02F1/133608

  including particular frames or supporting means · CPC title