Backlight assembly and liquid crystal display including the same

• US 9,158,152 B2
• Filed: 04/05/2011
• Issued: 10/13/2015
• Est. Priority Date: 06/09/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Noh, Cheol-Yong, Choi, Seong-Sik
• Primary Examiner(s): Glick, Edward
• Assistant Examiner(s): CHUNG, DAVID Y
• Application Number:
  US13/080,043
• Publication Number:
  US 20110304794A1
• Time in Patent Office: 1,652 Days
• Field of Search: 349/58, 349/65
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means

Abstract

A liquid crystal display includes a backlight assembly. The backlight assembly includes a light guide plate, a light source module which emits light to a side surface of the light guide plate, and a housing which accommodates the light guide plate and the light source module. The light source module includes a printed circuit board on which a plurality of a point light source is mounted, and a light source fixing board which supports the printed circuit board. The housing includes a bottom portion on which the light guide plate is placed, and a fixing portion which extends from an edge of the bottom portion. An extension portion of the light source fixing board, which is adjacent to a corner of the light guide plate, and an end of the fixing portion of the housing, are coupled to a reinforcing member.

Claims

1. A backlight assembly comprising:

a light source module comprising;

a light guide member;

a plurality of first point light sources which is disposed adjacent to a first side of the light guide member,

a support portion which is elongated in a first direction and fixes the first point light sources in place,

a base portion which extends from an edge of the support portion and is overlapped by the light guide member, and

an extension portion which is adjacent to a corner of the light guide member, and extends in the first direction from an end of the base portion and further than an end of the support portion;

a housing comprising;

a bottom portion which supports the light guide member;

a fixing portion which extends from an edge of the bottom portion, the fixing portion comprising;

a first bent portion which extends from the edge of the bottom portion in the direction perpendicular to the bottom portion,

a second bent portion which is parallel to and faces the first bent portion, and

a first connecting portion which connects the first bent portion to the second bent portion; and

a reinforcing member which is coupled and fixed to each of the extension portion of the light source module and the fixing portion of the housing, and disposed between the extension portion of the light source module and the fixing portion of the housing in a direction perpendicular to the bottom portion, the reinforcing member comprising;

a first coupling portion which is coupled directly to the extension portion of the light source module; and

a second coupling portion which extends from an end of the first coupling portion, directly coupled to the first connecting portion of the fixing portion, the second coupling portion comprising;

a second connecting portion which extends directly from an end of the first coupling portion; and

a third bent portion and a fourth bent portion which respectively extend from edges of the second connecting portion in a direction of the bottom portion of the housing, and are parallel to each other.

2. The backlight assembly of claim 1, wherein the extension portion of the light source module is connected to the first connecting portion of the fixing portion of the housing, by the reinforcing member.

3. The backlight assembly of claim 1, wherein outer surfaces of the third bent portion and the fourth bent portion of the second coupling portion respectively contact inner surfaces of the first bent portion and the second bent portion of the fixing portion of the housing, such that a portion of the fixing portion surrounds a portion of the reinforcing member.

4. The backlight assembly of claim 1,

wherein

the reinforcing member comprises a plurality of a coupling hole,

the light source module comprises a plurality of a first through hole;

and

the fixing portion of the housing comprises a plurality of a second through hole; and

wherein the coupling holes, the first through holes and the second through holes are respectively aligned with each other, such that a fixing member extends through an aligned coupling hole, first through hole and second through hole.

5. The backlight assembly of claim 4, wherein the fixing member in the coupling holes is a screw or a rivet.

6. The backlight assembly of claim 1, further comprising a plurality of a second point light source disposed adjacent to a second side of the light guide member which faces the first side of the light guide member.

7. The backlight assembly of claim 1,

wherein the base portion of the light source module comprises a step part which protrudes in a direction of the light guide member, and

wherein the step part includes an insertion groove indented into a side surface thereof, such that an edge of the bottom portion of the housing is in the insertion groove.

8. The backlight assembly of claim 1, wherein the fixing portion of the housing is connected directly to a short side of the bottom portion of the housing.

9. AT backlight assembly comprising:

a light source module comprising;

a light guide member;

a plurality of first point light sources which is disposed adjacent to a first side of the light wide member,

a support portion which is elongated in a first direction and fixes the first point light sources in place,

a base portion which extends from an edge of the support portion and is overlapped by the light guide member, and

an extension portion which is adjacent to a corner of the light guide member, and extends in the first direction from an end of the base portion and further than an end of the support portion;

a housing comprising;

a bottom portion which supports the light guide member; and

a fixing portion which extends from an edge of the bottom portion; and

a reinforcing member which is coupled and fixed to each of the extension portion of the light source module and the fixing portion of the housing, and disposed between the extension portion of the light source module and the fixing portion of the housing in a direction perpendicular to the bottom portion,

wherein an entire surface of the bottom portion of the housing includes protrusions and recesses.

10. A backlight assembly comprising:

a light source module comprising;

a plurality of point light sources on a support portion elongated in a first direction, and

a light source fixing board which extends further than an end of the support portion, in the first direction, and includes the point light sources thereon;

a housing comprising;

a bottom portion overlapping the light source fixing board, and

a fixing portion which extends from an edge of the bottom portion and is fixed to the light source fixing board, the fixing portion comprising;

a first bent portion which extends from the edge of the bottom portion in the direction perpendicular to the bottom portion,

a second bent portion which is parallel to and faces the first bent portion, and

a first connecting portion which connects the first bent portion to the second bent portion; and

a reinforcing member which is disposed adjacent to at least one corner of the housing, interposed between the light source fixing board and the housing in a direction perpendicular to the bottom portion, coupled and fixed to each of the light source fixing board and the housing, the reinforcing member comprising;

a first coupling portion which is coupled to the light source fixing board; and

a second coupling portion which extends from an end of the first coupling portion, coupled to the first connecting portion of the fixing member, the second coupling portion comprising;

a second connecting portion which extends directly from an end of the first coupling portion; and

a third bent portion and a fourth bent portion which respectively extend from edges of the second connecting portion in a direction of the bottom portion of the housing, and are parallel to each other.

11. The backlight assembly of claim 10, wherein the light source fixing board comprises:

the support portion which fixes the point light sources in place,

a base portion which extends from an edge of the support portion and is overlapped by a light guide member of the light source module, and

an extension portion which is adjacent to a corner of the light guide member, and extends in the first direction from an end of the base portion and further than the end of the support portion.

12. A liquid crystal display comprising:

a backlight assembly providing light; and

a liquid crystal display panel disposed on the backlight assembly and displaying an image by using the light,

wherein the backlight assembly comprises;

a light source module comprising;

a light guide member,

a plurality of a point light source which is disposed adjacent to a side of the light guide member,

a support portion which is elongated in a first direction and fixes the point light sources in place,

a base portion which extends from an edge of the support portion and is overlapped by the light guide member, and

an extension portion which is adjacent to a corner of the light guide member, and extends in the first direction from an end of the base portion and further than an end of the support portion;

a housing comprising;

a bottom portion which supports the light guide member, and

a fixing portion which extends from an edge of the bottom portion, the fixing portion comprising;

a first bent portion which extends from the edge of the bottom portion in the direction perpendicular to the bottom portion,

a second bent portion which is parallel to and faces the first bent portion, and

a first connecting portion which connects the first bent portion to the second bent portion; and

a single unitary indivisible reinforcing member which is coupled and fixed to each of the extension portion of the light source module and the fixing portion of the housing, disposed between the extension portion of the light source module and the fixing portion of the housing in a direction perpendicular to the bottom portion, the single unitary indivisible member comprising;

a first coupling portion which is coupled to the light source fixing board; and

a second coupling portion which extends from an end of the first coupling portion, coupled to the first connecting portion of the housing, the second coupling portion comprising;

a second connecting portion which extends directly from an end of the first coupling portion; and

a third bent portion and a fourth bent portion which respectively extend from edges of the second connecting portion in a direction of the bottom portion of the housing, and are parallel to each other.

13. The liquid crystal display of claim 12, wherein

the single unitary indivisible reinforcing member overlaps both the extension portion of the light source module and the fixing portion of the housing;

the extension portion of the light source module includes a first through hole;

the fixing portion of the housing includes a second through hole;

the single unitary indivisible reinforcing member includes a third through hole and a fourth through hole; and

the first and third through holes are aligned with each other, and the second and fourth through holes are aligned with each other, when the single unitary indivisible reinforcing member coupled and fixed to each of the extension portion of the light source module and the fixing portion of the housing.