KR101655459B1 - A backlight unit and a display apparatus - Google Patents

Abstract

A backlight unit according to an embodiment of the present invention includes a bottom cover having a bottom surface and side walls, and a cable draw-out hole for drawing a cable to the bottom surface; A light emitting module in the bottom cover; A light guide plate disposed on one side of the light emitting module in the bottom cover; An optical sheet on the light guide plate; A support member coupled to the bottom cover and having a portion disposed on the optical sheet; And a top cover disposed on the support member and coupled with the bottom cover.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a backlight unit and a display device.

Among display devices, a liquid crystal display device requires a backlight unit that provides light for displaying an image.

Wherein the backlight unit includes a light source for generating light, and optical sheets disposed on a light path between the light source and the liquid crystal display device, wherein the display device includes a display panel disposed on a path of light emitted from the backlight unit, .

The embodiment provides a backlight unit and a display device having a new structure.

The embodiment provides a backlight unit and a display device that are easy to assemble.

A backlight unit according to an embodiment of the present invention includes a bottom cover having a bottom surface and side walls, and a cable draw-out hole for drawing a cable to the bottom surface; A light emitting module in the bottom cover; A light guide plate disposed on one side of the light emitting module in the bottom cover; An optical sheet on the light guide plate; A support member coupled to the bottom cover and having a portion disposed on the optical sheet; And a top cover disposed on the support member and coupled with the bottom cover.

A display device according to an embodiment of the present invention includes a bottom cover having a bottom surface and side walls, and a cable draw-out hole for drawing a cable to the bottom surface; A light emitting module in the bottom cover; A light guide plate disposed on one side of the light emitting module in the bottom cover; An optical sheet on the light guide plate; A support member coupled to the bottom cover and having a portion disposed on the optical sheet; A display panel supported by the support member and disposed on the optical sheet; And a top cover disposed on the support member and coupled with the bottom cover.

The embodiment can provide a backlight unit and a display device having a new structure.

The embodiment can provide a backlight unit and a display device that are easy to assemble.

1 is an exploded perspective view of a display device according to an embodiment;
FIG. 2 is a cross-sectional view of the display device of FIG. 1 taken along the line I-I '; FIG.
3 is a view showing a light emitting module provided inside the bottom cover in the display device according to the embodiment.
4 is a view showing a support member in a display device according to an embodiment.
5 and 6 are a front view and a rear view of the bottom cover according to the embodiment.
7 to 10 are views for explaining the structure of a support member in a display device according to an embodiment.
11 is a view for explaining a display panel in a display device according to the embodiment;
12 to 15 are views for explaining a structure for preventing the flow of a reflection sheet, a light guide plate, and an optical sheet in a display device according to an embodiment.
Figs. 16 and 17 are views for explaining a structure for providing a path for electrically connecting a power supply device or a printed circuit board disposed on the back side of the connector and the bottom cover in the display device according to the embodiment. Fig.
Figs. 18 and 19 are diagrams for explaining a top cover of a display device according to the embodiment; Fig.

In the description of the embodiments, it is to be understood that each layer (film), region, pattern or structure may be referred to as being "on" or "under" a substrate, each layer It is to be understood that the terms " on "and " under" include both " directly "or" indirectly " do. In addition, the criteria for the top / bottom or bottom / bottom of each layer are described with reference to the drawings.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

Hereinafter, a backlight unit and a display device according to embodiments will be described in detail with reference to the accompanying drawings.

A display device according to an embodiment of the present invention includes a backlight unit and a display panel that receives light from the backlight unit and displays an image. Therefore, in the embodiment, the backlight unit is also described together with the display device.

The display device according to the embodiment may be formed in a rectangular shape having two long sides and two short sides. In the case where the display device is mounted on a wall or erected by using a stand structure, one long side is disposed on the lower side, the other long side is disposed on the upper side, and the two short sides are disposed on the left and right sides, respectively. For convenience of explanation, the long side disposed on the lower side is referred to as a first long side, the long side disposed on the upper side is referred to as a second long side, the short side disposed on the left side is referred to as a first short side, Is referred to as the second short side. However, this does not limit the claims of the present invention.

In the display device according to the embodiment, the control interface of at least one of the remote control unit signal receiving unit, the volume control unit, the channel control unit, and the screen control unit may be disposed on the first long side.

In the embodiment, the direction in which the top cover and the display panel are disposed is referred to as the front side and the direction in which the bottom cover is disposed is referred to as the back side. However, this does not limit the claims of the present invention.

FIG. 1 is an exploded perspective view of a display device according to an embodiment, FIG. 2 is a sectional view taken along line I-I 'of FIG. 1, and FIG. 3 is a cross- FIG. 4 is a view showing a supporting member in the display device according to the embodiment. FIG.

1 to 4, a display device according to an embodiment includes a bottom cover 10, a light emitting module 80 in the bottom cover 10, a reflective sheet 20 on the bottom cover 10, A light guide plate 30 on the reflective sheet 20, an optical sheet 40 on the light guide plate 30, a display panel 60 on the optical sheet 40, And a support member 50 disposed between the bottom cover 10 and the top cover 70.

The bottom cover 10 has a rectangular planar shape having a first long side, a second long side, a first short side, a second short side, and includes a bottom side and four side walls vertically extending from the bottom side . The bottom cover 10 accommodates the light emitting module 80, the reflective sheet 20, the light guide plate 30, and the optical sheet 40.

5 and 6 are a front view and a rear view of the bottom cover according to the embodiment.

As shown in FIG. 5, the bottom cover 10 may be formed of, for example, a metal material. The bottom cover 10 may have a rigidity At least one first convex portion 10a extending in a first direction and at least one second convex portion 10b extending in a second direction perpendicular to the first direction. The first convex portion 10a and the second convex portion 10b may be formed by pressing the bottom cover 10 and have a protruded shape as compared with the adjacent portions.

The first convex portion 10a may extend in the first direction on the bottom cover 10 and the second convex portion 10b may extend on the bottom cover 10 in a rectangular shape, And extend in a second direction. The first convex portion 10a and the second convex portion 10b support the reflective sheet 20 and the first convex portion 10a is formed so that the reflective sheet 20 can be supported in a flat state. And the uppermost surface of the second convex portion 10b may be disposed on the same horizontal plane. That is, the top surfaces of the first convex portion 10a and the second convex portion 10b may be formed at the same height.

A first radiation member 11 may be provided between the second convex portions 10b and a plurality of the first radiation members 11 may be installed. For example, the first heat-radiating member 11 may be formed of a heat pipe.

Since the second convex portion 10b is formed to be protruded, an inclined surface is formed at a portion adjacent to the first heat radiation member 11 and at a portion adjacent to the first convex portion 10a. The inclined surface of the portion adjacent to the first heat radiation member 11 may be formed more gently than the inclined surface adjacent to the first convex portion 10a in order to facilitate the installation of the first heat radiation member 11. [

A fixing member 13 is coupled to the bottom cover 10. The fixing member 13 may be provided with a coupling hole 13c and may be fixed to the bottom cover 10 through a coupling member such as a screw and the first radiation member 11 may be fixed to the bottom cover 10 So that it can be firmly fixed. The top surface of the fixing member 13 is disposed on the same horizontal plane as the top surfaces of the first and second convex portions 10a and 10b so that the reflective sheet 20 can be supported in a flat state It is possible.

The fixing member 13 includes a body portion 13a extending in the first direction and a branch portion 13b extending in the second direction from the body portion 13a. A plurality of branch portions 13b may be formed on one body portion 13a and at least a part of the branch portions 13b may be disposed on the first heat radiation member 11, 11) can be tightly fixed to the bottom cover (10).

6, a plurality of stud pins 14 are formed on a back surface of the bottom cover 10 so that a power supply device or a printed circuit board disposed on the back surface of the bottom cover 10 can be fixed do. The plurality of stud pins 10 may be combined with a power source device, a printed circuit board, or the like to further enhance the rigidity of the bottom cover 10.

In the first long side of the bottom cover 10, coupling holes 10h and 10i are formed so as to be coupled with the first support member 51 and the top cover 70 through a coupling member such as a screw, A coupling protrusion 10g is formed on the second long side, the first short side and the second short side of the bottom cover 10 so as to be hooked to the top cover 70.

Although not shown, an H beam may be coupled to the back surface of the bottom cover 10 to compensate for the rigidity of the bottom cover 10.

Referring again to FIGS. 2 and 3, the second radiation member 12 is coupled to the first long side of the bottom cover 10.

The second radiation member 12 may be fixed to the bottom cover 10 through a coupling member such as a screw and may be disposed on a part of the first radiation member 11 So that the first radiation member 11 can be closely fixed to the bottom cover 10 together with the fixing member 13.

The uppermost surface of the protruding portion 12a is located on the uppermost surface of the fixing member 13, the first convex portion 10a and the second convex portion 12a, May be disposed on the same horizontal plane as the uppermost surface of the first substrate 10b.

The second heat radiation member 12 is in contact with the first heat radiation member 11 and transmits heat generated from the light emission module 80 to the first heat radiation member 11 to enable effective heat emission .

The second radiation member 12 has a support portion 12b extending along the side wall of the bottom cover 10 and the support member 12b of the second radiation member 12 is provided with the light emitting module 80 do.

The light emitting module 80 includes at least one light emitting device 82 and a light emitting module substrate 81 having a circuit pattern for supporting the light emitting device 82 and providing power to the light emitting device 82 do. The light emitting module 80 may further include a connector 83 for electrically connecting the light emitting module substrate 81 to an external power supply unit or a printed circuit board. The light emitting module 80 may be formed of a lamp such as a CCFL or other types of light emitting devices such as an OLED, It is also possible.

The light emitting element 82 is disposed only on the first long side or the second long side of the display panel 60. In the embodiment, it is exemplified that the light emitting element 82 is disposed on the first long side.

The number of the light emitting devices 82 may vary according to the size of the display panel 60, that is, the inch of the display panel 60, in order to provide light having a desired luminance and a uniform distribution. The number of the light emitting devices 82 is preferably 2.5 to 3.5 times the number of inches of the display panel 60. It is difficult to provide light having appropriate luminance and uniform distribution when the number of light emitting devices 82 is less than or equal to 2.5 times the number of inches of the display panel 60. [

For example, when the display panel 60 is 47 inches, 118 to 164 light emitting devices 82 may be installed. In the embodiment, the display panel 60 is 47 inches and the light emitting devices 82 are installed in 138 pieces.

The light guide plate 30 is provided on the bottom cover 10 and the second heat radiation member 12 to emit the light emitted from the light emission device 82 in the form of a surface light source. The reflective sheet 20 is disposed between the light guide plate 30 and the bottom cover 10 to reflect the light emitted from the light emitting device 82 in the direction in which the light guide plate 30 is disposed, . The reflective sheet 20 may not be formed and may be coated with a material having high reflectivity to the light guide plate 30 or the bottom cover 10 without being present as a separate sheet.

The optical sheet (40) is disposed on the light guide plate (30). For example, the optical sheet 40 may include a first diffusion sheet 41, a prism sheet 42, and a second diffusion sheet 43. It is also possible that the optical sheet 40 is not formed, only one diffusion sheet is formed, or only one prism sheet is formed. The number and kinds of the optical sheets 40 may be variously selected depending on the required luminance characteristics.

The display panel (60) is disposed on the optical sheet (40). The display panel 60 may be a liquid crystal display panel.

Figs. 7 to 10 are views for explaining the structure of a support member in the display device according to the embodiment, and Fig. 11 is a view for explaining a display panel in the display device according to the embodiment.

1 to 4 and 7 to 10, the support member 50 includes a first support member 51, a second support member 52, a third support member 53, (54). The fourth support member 54 may be formed of two separate fourth support members 54a and 54b.

For example, the first support member 51 may be disposed on the first long side, and the fourth support member 54 may be disposed on the second long side. The second support member 52 may be disposed on the first short side, and the third support member 53 may be disposed on the second short side.

The second supporting member 52, the third supporting member 53 and the fourth supporting member 54 may be formed of, for example, a metal material such as a metal Or may be formed of a material.

The first supporting member 51 and the fourth supporting member 54 are coupled to the first long side and the second long side of the bottom cover 10 and the second supporting member 52 and the third supporting member 53, Is coupled to the first short side and the second short side of the bottom cover 10.

2, the support member 50 allows the reflective sheet 20, the light guide plate 30, and the optical sheet 40 to be tightly coupled to the bottom cover 10, Thereby supporting the panel 60.

Referring to FIGS. 2, 7, 8 and 11, the first support member 51 includes a first portion (not shown) disposed on the bottom cover 10, the light emitting module 80, And a second portion 51b that is bent vertically from the first portion 51a and is disposed on the outer side of the bottom cover 10. [

A recess 51c is formed in the first portion 51a so that the first flexible printed circuit board 61 of the display panel 60 can extend outside the bottom cover 10, A first engagement hole 51d is formed in the bottom cover 10 so as to be coupled to the bottom cover 10 via a coupling member such as a screw or a coupling member such as a screw together with the bottom cover 10 and the top cover 70 . The second portion 51b may be provided with a chip placement hole 51e through which a chip 63 coupled to the printed circuit board 62 of the display panel 60 may be disposed, A coupling hole 51f is formed so as to be able to be coupled through the coupling member such as a screw together with the base 10 and the top cover 70. [

The second support member 52 is disposed on the bottom cover 10 so that the reflective sheet 20, the light guide plate 30 and the optical sheet 40 can be brought into close contact with the bottom cover 10, A second portion 52b protruding upward from the first portion 52a to prevent the display panel 60 from flowing and a second portion 52b protruding upward from the first portion 52a, And a third portion 52c and a fourth portion 52e that are disposed on the inner side and the outer side of the side wall of the bottom cover 10 by being alternately arranged and spaced apart from each other. The second support member 52 may be forcedly engaged with the side wall of the bottom cover 10 by the third portion 52c and the fourth portion 52e. The third portion 52c is formed with a coupling protrusion 52d and the coupling protrusion 52d is inserted into the second support member coupling hole 10c formed in the bottom cover 10 to be hooked have. A chip placement groove 52f may be formed in the fourth portion 52e and a chip (not shown) coupled to the second flexible printed circuit board 64 of the display panel 60 may be formed in the chip placement groove 52f. Quot;) can be disposed. An insulating tape may be formed on the first portion 52a in contact with the second flexible printed circuit board 64, or an insulating coating layer may be formed.

The third support member 53 may have the same structure as that of the second support member 52, and a duplicate description thereof will be omitted. Since the fourth support member 54 may be formed in the same or similar structure as the second support member 52 and the third support member 53, the overlapping description will be omitted.

Since the fourth support member 54 is disposed on the side of the second long side, it needs to be formed long. In this case, since the fourth support member 54 may be bent or damaged, the fourth support member 54 may be divided into two parts to be more firmly coupled to the bottom cover 10. On the other hand, since the first support member 51 is formed in a larger area than the fourth support member 54, it is less likely to be warped or damaged, and is more robust when it is formed of a synthetic resin material. It may not be formed.

12 to 15 are views for explaining a structure for preventing the flow of the reflective sheet, the light guide plate and the optical sheet in the display device according to the embodiment.

12 and 13, the reflective sheet 20, the light guide plate 30, and the optical sheet 40 are prevented from flowing in the portion of the bottom cover 10 adjacent to the first long side, A first boss 10d is formed to be spaced apart from the light emitting element 82 by a predetermined distance.

The first boss insertion groove 21 corresponding to the first boss 10d is formed in the reflective sheet 20 and the first boss insertion groove 21 corresponding to the first boss 10d is formed in the light guide plate 30. [ (31) is formed.

The first boss insertion grooves 21 and 31 are coupled to the first bosses 10d so that the reflective sheet 20 and the light guide plate 30 are prevented from flowing.

Although not shown in detail, the optical sheet 40 may also have a first boss insertion groove corresponding to the first boss 10d.

14, a second boss (not shown) for preventing the reflection sheet 20, the light guide plate 30, and the optical sheet 40 from flowing is provided at a portion adjacent to the second short side of the bottom cover 10 10e are formed.

A second boss insertion groove 22 corresponding to the second boss 10e is formed in the reflective sheet 20 and a second boss insertion groove 22 corresponding to the second boss 10d is formed in the light guide plate 30. [ (32) are formed.

The second boss insertion grooves 22 and 32 are coupled to the second boss 10e to prevent the reflection sheet 20 and the light guide plate 30 from flowing.

Although not shown in detail, the optical sheet 40 may have a second boss insertion groove corresponding to the second boss 10e.

The second boss 10e may be formed on the second short side or the third short side of the bottom cover 10, or may be formed on only one of them.

15, a connector insertion groove 23 corresponding to the connector 83 is formed in the reflective sheet 20, and connector insertion grooves 33 (corresponding to the connector 83) corresponding to the connector 83 are formed in the light guide plate 30 Is formed.

The connector 83 electrically connects the light emitting module substrate 81 on which the light emitting device 82 is formed to a power supply device or a printed circuit board disposed on the back surface of the bottom cover 10, The reflective sheet 20 and the light guide plate 30 are held in contact with the grooves 23 and 33 so that the reflective sheet 20 and the light guide plate 30 can be separated from the light emitting device 82 by a predetermined distance.

Although not shown in detail, a connector insertion groove corresponding to the connector 83 may be formed in the optical sheet 40 as well.

Figs. 16 and 17 are views for explaining a structure for providing a path for electrically connecting a power supply device or a printed circuit board disposed on the back side of the connector and the bottom cover in the display device according to the embodiment. Fig.

16 and 17, a cable lead-out hole 10f is formed at a corner portion of the bottom cover 10, that is, a portion where the first long side meets the first short side, A cable lead-out groove 12d corresponding to the cable lead-out hole 10f is formed at an end of the second heat-radiating member 12, The cable outlet hole 10f is formed on the bottom surface of the bottom cover 10 and connects the front surface and the back surface of the bottom cover 10. [

Since the cable lead-out hole 10f and the cable lead-out groove 12d are formed in a portion facing the connector 83, a cable (not shown) coupled to the connector 83 is connected to the bottom cover 10, So that the connector 83 and the power supply unit or the printed circuit board provided on the back surface of the bottom cover 10 can be easily connected.

The cable lead-out hole 10f and the cable lead-out groove 12d may also be formed at a portion where the first long side and the second short side meet.

18 and 19 are views for explaining the top cover of the display device according to the embodiment.

18 and 19, the top cover 70 includes a first portion 70a disposed on a front surface of a display device, and a second portion 70b disposed on a side surface of the display device And a second portion 70b.

A coupling hole 71 is formed in the first long side of the first portion 70a so as to be coupled with the bottom cover 10 and the first supporting member 51 through a coupling member such as a screw.

A coupling hole 72 is formed in the first long side of the second portion 70b so as to be coupled with the bottom cover 10 and the first support member 70 through a coupling member such as a screw. In the second long side, the first short side, and the second short side of the second portion 70b, a coupling hole 73 to be hooked to the coupling projection 10g of the bottom cover 10 is formed.

The top cover 70 may be formed in the form of a rectangular frame including a first long side, a second long side, a first short side and a second short side.

In the display device according to the embodiment, the top cover 70 is coupled to the bottom cover 10 through a coupling member such as a screw at the first long side, and is hooked at the second long side, the first short side and the second short side .

The top cover 70 is hooked on the side surface of the bottom cover 10 and the top cover 70 is screwed on the front and side surfaces of the bottom cover 10. Since the screws are inserted and fastened in directions orthogonal to each other on the front surface and the side surface, the top cover 70 and the bottom cover 10 can be more firmly coupled.

The hooking has the advantage that the convenience and speed of the assembling process are ensured and the coupling through the coupling member can ensure the rigidity of the assembly.

The top cover 70 may be in contact with the first flexible printed circuit board 61 and the second flexible printed circuit board 64 coupled to the display panel 60. In order to secure electrical insulation, An insulating tape may be formed on an area where the top cover 70 is in contact with the first flexible printed circuit board 61 and the second flexible printed circuit board 64, or an insulating coating layer may be formed.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

The present invention relates to a liquid crystal display device and a method of manufacturing the same.

Claims (12)

A bottom cover having a bottom surface and side walls and having cable draw-out holes for pulling out cables at corner portions of the bottom surface;
A light emitting module in the bottom cover; And
A heat dissipation member including a plurality of protrusions disposed on a bottom surface of the bottom cover, and a support portion extending between side walls of the bottom cover and the light emitting module;
A light guide plate disposed on a bottom surface of the bottom cover and emitting light emitted from the light emitting module to a surface light source; And
And a reflective sheet disposed between the light guide plate and the bottom surface of the bottom cover,
The light emitting module includes a module substrate disposed on a supporting portion of the heat dissipating member, a plurality of light emitting devices arranged on the module substrate and corresponding to one side of the light guide plate, and a connector connected to the module substrate and adjacent to the cable draw- ,
The light emitting device includes a light emitting diode,
Wherein the light guide plate has a connector insertion groove at a portion corresponding to the connector,
Wherein the reflective sheet has a connector insertion groove in a portion corresponding to the connector. The method according to claim 1,
Wherein the bottom cover has a first long side, a second long side facing the first long side, a first short side and a second short side between the first long side and the second long side, Wherein at least one of the two long sides and at least one of the first short side and the second short side meet. The method according to claim 1,
An optical sheet on the light guide plate; And
And a support member coupled to the bottom cover and having a portion disposed on the optical sheet,
Wherein the optical sheet includes a connector insertion groove corresponding to the connector. 4. The method according to any one of claims 1 to 3,
And the connector is in contact with the connector insertion groove of the light guide plate. 5. The method of claim 4,
Wherein the radiation member has a cable lead-out groove at a portion corresponding to the cable lead-out hole. A bottom cover having a bottom surface and side walls and having cable draw-out holes for pulling out cables at corner portions of the bottom surface;
A light emitting module in the bottom cover;
A heat dissipation member including a plurality of protrusions disposed on a bottom surface of the bottom cover, and a support portion extending between side walls of the bottom cover and the light emitting module;
A light guide plate disposed on a bottom surface of the bottom cover and disposed on one side of the light emitting module;
A display panel disposed on the light guide plate; And
And a reflective sheet disposed between the light guide plate and the bottom surface of the bottom cover,
The light emitting module includes a module substrate disposed on a supporting portion of the heat dissipating member, a plurality of light emitting devices arranged on the module substrate and corresponding to one side of the light guide plate, and a connector connected to the module substrate and adjacent to the cable draw- ,
The light emitting device includes a light emitting diode,
Wherein the light guide plate has a connector insertion groove at a portion corresponding to the connector,
Wherein the reflective sheet has a connector insertion groove in a portion corresponding to the connector. The method of claim 6, wherein
Wherein the bottom cover has a first long side, a second long side facing the first long side, a first short side and a second short side between the first long side and the second long side, Wherein at least one of the two long sides and at least one of the first short side and the second short side meet. 8. The method of claim 7,
Wherein the light emitting module is disposed on the side of the first long side, and the side of the first long side is adjacent to the control interface. 9. The method according to any one of claims 6 to 8,
An optical sheet on the light guide plate; And
And a support member coupled to the bottom cover and having a portion disposed on the optical sheet,
Wherein the optical sheet includes a connector insertion groove corresponding to the connector. 9. The method according to any one of claims 6 to 8,
And the connector is in contact with the connector insertion groove of the light guide plate. 11. The method of claim 10,
And the radiation member has a cable lead-out groove in a portion corresponding to the cable lead-out hole. 10. The method of claim 9,
Wherein the light emitting elements are arranged in a number of 2.5 to 3.5 times the number of inches of the display panel.

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