Backlight unit and a display apparatus including the same

Patent metadata

Field	Value
Publication number	US-9897738-B2
Application number	US-201514980005-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Feb 5, 2015
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A display apparatus includes a display panel which receives light to display an image. A light guide plate guides the light toward the display panel. A light source unit is disposed at a first side of the light guide plate to provide the light to the light guide plate. The light source unit includes a printed circuit board which includes a first area and a second area. A first light source is disposed on the first area and generates the light. A first stepped part is disposed on the second area and faces the first light source. A first adhesive part is disposed on the second area. The first stepped part reflects the light which is generated from the first light source toward the light guide plate, and the first adhesive part attaches the printed circuit board to the light guide plate.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel which receives light to display an image;
a light guide plate which guides the light toward the display panel;
a light source unit which is disposed at a first side of the light guide plate to provide the light to the light guide plate; and
a bottom chassis which accommodates the light guide plate and the light source unit, wherein the bottom chassis comprises a recessed portion in which the light source unit is accommodated, a bottom portion in which the light guide plate is accommodated, and an inclined portion connecting the recessed portion to the bottom portion, and the bottom chassis further comprises a light absorbing member which is disposed on the inclined portion,
wherein the light source unit comprises:
a printed circuit board which includes a first area and a second area;
a first light source which is disposed on the first area and generates the light;
a first stepped part which is disposed on the second area and faces the first light source; and
a first adhesive part which is disposed on the second area,
wherein the first stepped part reflects the light which is generated from the first light source toward the light guide plate, and the first adhesive part attaches the printed circuit board to the light guide plate.

2. The display apparatus of claim 1 , wherein the second area overlaps the light guide plate in a plan view.

3. The display apparatus of claim 1 , wherein the display apparatus further includes a second light source, a second stepped part, and a second adhesive part, wherein the first area and the second area, respectively, extend along a first direction, and
wherein the first and second light sources are arranged along the first direction, and the first and second stepped parts and the first and second adhesive parts are alternately arranged along the first direction.

4. The display apparatus of claim 1 , wherein a thickness of the first adhesive part is greater than a thickness of the first stepped part.

5. The display apparatus of claim 1 , wherein the light source unit further comprises a reflective part which is disposed between the first stepped part and the printed circuit board, and between the first adhesive part and the printed circuit board.

6. The display apparatus of claim 1 , wherein the first stepped part comprises a light reflective material.

7. The display apparatus of claim 6 , wherein the first stepped part comprises a step compensating member and a reflection layer including the light reflective material, and the reflection layer is disposed on the step compensating member.

8. The display apparatus of claim 1 , wherein the first stepped part comprises a light reflecting part and a light absorbing part.

9. The display apparatus of claim 1 wherein a reflection layer comprising a light reflective material is disposed on the bottom chassis.

10. The display apparatus of claim 1 , further comprising a reflective sheet which is disposed between the light guide plate and the bottom chassis.

11. The display apparatus of claim 1 , wherein the light source is a side-emitting light source.

12. A backlight unit comprising:
a light source unit for providing light;
a light guide plate for receiving the light and guiding the light; and
a bottom chassis for holding the light source unit and the light guide plate, wherein the bottom chassis comprises a recessed portion in which the light source unit is held, a bottom portion in which the light guide plate is held, and an inclined portion connecting the recessed portion to the bottom portion, and the bottom chassis further comprises a light absorbing member which is disposed on the inclined portion,
wherein the light source unit comprises:
a printed circuit board including a first area and a second area;
at least one light source which is disposed on the first area and generates the light;
at least one stepped part which is disposed on the second area and faces the light source; and
at least one adhesive part which is disposed on the second area,
wherein the stepped part reflects the light, which is generated from the light source, toward the light guide plate, and the adhesive part attaches the printed circuit board to the light guide plate.

13. The backlight unit of claim 12 , wherein the second area overlaps the light guide plate in a plan view.

14. The backlight unit of claim 12 , wherein the stepped part comprises a light reflecting part and a light absorbing part.

15. The backlight unit of claim 14 , wherein a reflection layer comprising a light reflective material is disposed on the bottom chassis.

16. A display apparatus comprising:
a display panel;
a light guide plate including an incident light surface and a light emitting surface, wherein the incident light surface is a side surface of the light guide plate;
a light source unit; and
a bottom chassis for holding the light source unit and the light guide plate, wherein the bottom chassis comprises a first portion in which the light source unit is held, a second portion in which the light guide plate is held, and a sloped portion connecting the first portion to the second portion, and the bottom chassis further comprises a light absorbing member which is disposed on the sloped portion, the light source unit comprising:
a printed circuit board having a first region and a second region, the first and second regions, respectively, extending along a first direction;
a light source disposed in the first region of the printed circuit board, wherein the light source emits light to a top surface of the printed circuit board, and the light source faces the incident light surface of the light guide plate;
a stepped part reflecting light emitted from the light source, wherein the stepped part is disposed in the second region of the printed circuit board in front of a light emitting surface of the light source; and
an adhesive part disposed in the second region of the printed circuit board, wherein the adhesive part has a first height with respect to the printed circuit board, the stepped part has a second height with respect to the printed circuit board, and the first height is greater than the second height.

17. The display apparatus of claim 16 , wherein the stepped part includes a light reflecting part and a light absorbing part.

Assignees

• Samsung Display Co Ltd

Inventors

• Song Min Young
• Kang Dongyeon
• Oh Sunhee

Classifications

• G02B6/0046

  Tapered light guide, e.g. wedge-shaped light guide · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G02B6/0023

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

• G02B6/0031 Primary

  Reflecting element, sheet or layer · CPC title

• G02B6/0091

  of the light source relative to the light guide (G02B6/0021 takes precedence) · CPC title