Edge type backlight unit and method for manufacturing the same

• US 8,764,267 B2
• Filed: 07/13/2011
• Issued: 07/01/2014
• Est. Priority Date: 07/14/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Miok
• Primary Examiner(s): DZIERZYNSKI, EVAN P
• Application Number:
  US13/182,094
• Publication Number:
  US 20120014135A1
• Time in Patent Office: 1,084 Days
• Field of Search: 362/612, 362/613, 362/623
• US Class Current: 362/623
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

An edge type backlight unit and a method for manufacturing the same are disclosed. The edge type backlight unit includes light sources for providing light, a printed circuit board (PCB) on which the light sources are mounted, a metal bracket that contacts the printed circuit board and dissipates heat of the printed circuit board, and a thermal hardener formed between the printed circuit board and the metal bracket. The printed circuit board supplies an electrical signal for driving the light sources to the light sources.

Claims

1. An edge type backlight unit comprising:

light sources configured to provide light;

a printed circuit board (PCB) on which the light sources are mounted and, configured to supply an electrical signal for driving the light sources to the light sources;

a metal bracket configured to contact the printed circuit board;

a thermal hardener formed between the printed circuit board and the metal bracket; and

a cover bottom configured to contact a side and bottom surfaces of the metal bracket,

wherein both sides of the printed circuit board contact the metal bracket, and a bottom surface of the printed circuit board contacts the thermal hardener.

2. The edge type backlight unit of claim 1, further comprising:

a light guide plate configured to convert light from the light sources into a surface light source and uniformly emit the light to a display surface of a display panel;

a reflector sheet disposed under the light guide plate; and

at least one optical sheet disposed between the light guide plate and the display panel,

wherein the cover bottom covers sides and bottom surfaces of the metal bracket, the light guide plate, and the reflector sheet.

3. The edge type backlight unit of claim 2, wherein the metal bracket includes a main body horizontally disposed on the cover bottom, a sidewall vertically bent from one end of the main body, and a dam which is vertically bent from the sidewall and is formed in a direction parallel to the main body,

wherein an area coated with the thermal hardener is provided in a space between the main body, the sidewall, and the dam.

4. The edge type backlight unit of claim 3, wherein a length of the dam is shorter than a length of the main body.

5. The edge type backlight unit of claim 2, wherein the metal bracket includes a main body horizontally disposed on the cover bottom, a first corner, which is bent from one end of the main body at an inclined angle, which is greater than 0°

and less than 90°

, a sidewall, which is bent from the first corner at the inclined angle and is vertical to the main body, a second corner bent from the sidewall at the inclined angle, and a dam which is bent from the second corner at the inclined angle and is formed in a direction parallel to the main body,

wherein an area coated with the thermal hardener is provided in a space between the main body, the first corner, the sidewall, the second corner, and the dam.

6. The edge type backlight unit of claim 5, wherein a length of the dam is shorter than a length of the main body.

7. The edge type backlight unit of claim 2, wherein the metal bracket includes a main body horizontally disposed on the cover bottom, a sidewall, which is curved from one end of the main body, and a dam which is curved from the sidewall and is formed in a direction parallel to the main body,

wherein an area coated with the thermal hardener is provided in a space between the main body, the sidewall, and the dam.

8. The edge type backlight unit of claim 7, wherein a length of the dam is shorter than a length of the main body.

9. A method for manufacturing an edge type backlight unit comprising:

standing a metal bracket and fixing the metal bracket to a jig;

coating an coating area of the metal bracket with a thermal hardener of a liquid state;

receiving a printed circuit board, on which light sources are mounted, on the thermal hardener;

applying heat to the thermal hardener and the printed circuit board to attach the thermal hardener to the printed circuit board; and

separating the metal bracket from the jig to attach the metal bracket to a cover bottom,

wherein the metal bracket contacts the printed circuit board, and

wherein both sides of the printed circuit board contact the metal bracket, and a bottom surface of the printed circuit board contacts the thermal hardener.

10. The method of claim 9, wherein the coating of the coating area of the metal bracket includes coating the coating area of the metal bracket with the thermal hardener of the liquid state using a dispenser.