KR101361965B1 - Back light unit, method of manufacturing the same and liquid crystal display device having the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device, comprising: a bottom case; A first light source unit disposed on one side of the bottom case and including a first board and a plurality of first light sources disposed on the first board; A second light source unit disposed on the other side of the bottom case and disposed below the second board and the second board; A light guide plate disposed between the first and second light sources; And a support main disposed on the light guide plate, and a backlight unit including the same, a method of manufacturing the same, and a liquid crystal display device having the same.

Description

BACK LIGHT UNIT, METHOD OF MANUFACTURING THE SAME AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a liquid crystal display device, and a backlight unit and a liquid crystal display device having the same that can simultaneously improve the prevention of poor assembly and brightness deterioration.

Today's liquid crystal display devices have tended to be increasingly wider due to light weight, thinness, and low power consumption.

Such a liquid crystal display device is largely composed of a liquid crystal panel and a backlight unit for providing light to the liquid crystal panel. Here, the liquid crystal panel includes a liquid crystal interposed between two substrates. The liquid crystal panel changes the alignment direction of the liquid crystal molecules due to an electric field to generate a difference in transmittance of light passing through the liquid crystal panel. In this case, the liquid crystal panel displays an image by using a difference in light transmittance. Here, since the liquid crystal panel does not form light by itself, the liquid crystal display device is disposed on one side of the liquid crystal panel and requires a backlight unit for providing light to the liquid crystal panel.

Such a backlight unit may include a reflector, a light guide plate, a light source unit, a bottom case accommodating them, and a support main fastened to the bottom case. Here, the backlight unit may arrange the light source units on both sides of the light guide plate to implement high brightness.

In order to assemble such a backlight unit, first, the light source units are respectively accommodated inside both sides of the bottom case, and then the reflector and the light guide plate are seated in the bottom case including the light source unit. Thereafter, the bottom case and the support main are fastened to each other.

Here, the light guide plate is seated between each of the light source units on both sides of the bottom case, and in the process of mounting the light guide plate, the light guide plate contacts the light source units disposed on both sides of the light guide plate, which may cause damage to the light source unit and deformation or damage of the light guide plate. Can be. To solve this problem, the size of the light guide plate is reduced or the position of the light source unit is moved toward the side wall of the bottom case rather than the designed value, thereby providing a constant distance between the light guide plate and the light source unit. That is, an assembly tolerance is provided between the light guide plate and the light source unit to prevent defects caused by the assembly of the backlight unit. However, such assembling tolerance may cause leakage of light, which in turn may lower the brightness of the backlight unit.

Therefore, although assembly tolerances are conventionally provided to prevent assembly failure of the backlight unit, such assembly tolerances are a factor of lowering luminance due to light leakage. Accordingly, there is a need for a new alternative capable of simultaneously preventing assembly of the backlight unit and deterioration in luminance of the backlight unit.

The present invention is to solve the problems that may occur in the backlight unit and the liquid crystal display device having the same, and in particular, to provide a backlight unit and a liquid crystal display device having the same that can prevent the assembly of the backlight unit and the brightness deterioration at the same time. Has its purpose.

Provided is a backlight unit of a solution according to the present invention. The backlight unit may include a bottom case; A first light source unit disposed on one side of the bottom case and including a first board and a plurality of first light sources disposed on the first board; A second light source unit disposed on the other side of the bottom case and disposed below the second board and the second board; A light guide plate disposed between the first and second light sources; And a support main disposed on the light guide plate.

Provided is a method of manufacturing a backlight unit of a solution according to the present invention. The method of manufacturing the backlight unit may include mounting a first light source on one side of the bottom case to face the first direction; Mounting a second light source on the support main; Disposing a light guide plate on one side of the first light source; And fastening the support main and the bottom case such that the second light source faces a second direction different from the first direction and the second light source is disposed between an inner surface of the bottom case and the light guide plate. can do.

A liquid crystal display device of the solution according to the present invention is provided. The liquid crystal display device may include the backlight unit; A liquid crystal panel mounted on the support main of the backlight unit; And a top case fastened to the support main and surrounding an edge of the liquid crystal panel.

In the backlight unit and the liquid crystal display device having the same according to the embodiment of the present invention, the light source units provided on both sides of the light guide plate are disposed in a direction opposite to each other, so that the backlight unit as well as the liquid crystal display device are prevented from being compacted and reduced in brightness. Can be achieved simultaneously.

In addition, the manufacturing method of the backlight unit according to the embodiment of the present invention by mounting inside the bottom case in the order of the first light source unit, the light guide plate and the second light source unit, it is possible to reduce the assembly interference between the light source unit and the light guide plate, the backlight It is possible to reduce assembly tolerances and assembly failures of the unit at the same time.

1 is an exploded perspective view of a liquid crystal display according to a first embodiment of the present invention.
FIG. 2 is a perspective view of the support main including the second light source unit shown in FIG.
3A and 3B are cross-sectional views of the liquid crystal display shown in FIG. 1.
4 to 7 are cross-sectional views illustrating a manufacturing process of a backlight unit included in a liquid crystal display according to a second exemplary embodiment of the present invention.

Embodiments of the present invention will be described in detail with reference to the drawings of the backlight unit and the liquid crystal display. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention.

Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like numbers refer to like elements throughout.

1 is an exploded perspective view of a liquid crystal display according to a first embodiment of the present invention. FIG. 2 is a perspective view of the support main including the second light source unit shown in FIG. 3A and 3B are cross-sectional views of the liquid crystal display shown in FIG. 1.

Referring to FIG. 1, the liquid crystal display according to the first exemplary embodiment of the present invention may include a liquid crystal panel 100, a backlight unit 200, and a top case 300.

In detail, the liquid crystal panel 100 may include a liquid crystal interposed between the first and second substrates 110 and 120 and the first and second substrates 110 and 120 that face each other and are bonded to each other. Although not illustrated in detail, each of the first and second substrates 110 and 120 may include a plurality of pixels. In this case, each pixel of the first substrate 110 may be defined by the intersection of the gate wiring and the data wiring, and a thin film transistor and a pixel electrode may be disposed in each pixel. In addition, a color filter may be disposed in each pixel of the second substrate 120, and a black matrix may be disposed in a peripheral area of each pixel. The common electrode forming an electric field with the pixel electrode may be disposed on the first substrate 110 or the second substrate 120. The configuration of the first and second substrates 110 and 120 may be variously changed by those skilled in the art according to driving modes of the liquid crystal display, for example, TN mode, IPS mode, VA mode, and FSS mode. In an embodiment, the shape of the first and second substrates 110 and 120 is not limited.

In addition, although not shown in the drawing, the liquid crystal panel 100 may further include a gate driving circuit unit for supplying a driving signal from the outside and a data driving circuit unit for supplying a data signal. Here, the gate driving circuit unit and the data driving circuit unit may be mounted on the substrate of the liquid crystal panel or connected to the liquid crystal panel through a connection member such as a tape carrier package. In addition, polarizers may be further disposed on outer surfaces of the first and second substrates 110 and 120, respectively.

The backlight unit 200 is disposed on one surface of the liquid crystal panel 100 to provide light to the liquid crystal panel 100. In this case, the liquid crystal panel 100 displays an image by adjusting an electric field applied to the liquid crystal to adjust a transmittance of light provided from the backlight unit 200.

The top case 300 may surround the edge of the liquid crystal panel 100 and be coupled to the backlight unit 200 to fix the backlight unit 200 on one surface of the liquid crystal panel 100.

Hereinafter, a backlight unit according to an embodiment of the present invention will be described in more detail with reference to FIGS. 1 to 3B.

1 to 3B, the backlight unit 200 according to the embodiment of the present invention includes a bottom case 210, first and second light source units 241 and 242, a light guide plate 230, and a support main 250. ) May be included.

First and second light source units 241 and 242 may be disposed at both sides of the bottom case 210, respectively. For example, the first light source unit 241 may be disposed along one side of the bottom case 210. In addition, the second light source unit 242 may be disposed along the other side of the bottom case 210, that is, along a side surface facing one side of the bottom case 210 facing the first light source unit 241.

Here, the bottom case 210 may further include a bent extension part 211 that is bent and extended at an upper edge of one side wall to cover the top surface of the first light source unit. That is, one side cross section of the bottom case may have a 'c' shape, and the first light source unit 241 may have a shape inserted into the 'c' of the bottom case 210. In this case, the reflective member 243 may be further disposed on a lower surface of the bent extension part 211 facing the first light source unit 241. Here, the reflective member 243 serves to prevent the light of the first light source unit 241 from being directly emitted to the liquid crystal panel 100. That is, the reflective member 243 may improve the brightness and the image quality of the liquid crystal display device. Here, the reflective member 243 may be attached to the bent extension 211 through the first adhesive member 271. In this case, the reflective member 243 may be a light source housing or a reflective film. In addition, an example of the first adhesive member 271 may be a double-sided tape or an adhesive. Another example of the reflective member 243 may be a reflective tape having an adhesive layer. When the reflective member 243 is a reflective tape, a separate first adhesive member 271 may not be required.

Here, the liquid crystal panel 110 may be disposed on the bend extension 211. In this case, a third adhesive member 273 may be disposed between the bent extension part 211 of the bottom case 210 and the liquid crystal panel 100. Accordingly, a part of the liquid crystal panel 100 may be fixed to the bottom case 210 by the third adhesive member 273. Here, the example of the third adhesive member 273 may be a double-sided tape or an adhesive.

Each of the first and second light source units 241 and 242 may include a board for mounting a plurality of light sources 241b and 242b, for example, a printed circuit board 241a and 242a. For example, the first light source unit 241 includes a plurality of first light sources 241b and a first printed circuit board 241a, and the second light source unit 242 includes a plurality of second light sources 242b. And a second printed circuit board 242a. Herein, examples of the light sources 241b and 242b may be light emitting diode chips.

Here, each of the first and second printed circuit boards 241a and 242a may have a mounting surface on which the light sources 241b and 242b are mounted and an adhesive surface facing the mounting surface. In this case, the adhesive surface of the first printed circuit board 241a of the first light source unit 241 may be attached to the bottom surface of the bottom case 210. Accordingly, the first light sources 241b of the first light source unit 241 may face the first direction, that is, the upper direction. That is, the upper surface of the first light source 241b may be disposed to face the upper side of the bottom case 210 and the liquid crystal panel 100. More specifically, the first light source 241b may be disposed on an upper surface of the first printed circuit board 241a.

In addition, the adhesive surface of the second printed circuit board 242a of the second light source unit 242 may be attached to the lower surface of the support main 250 facing the bottom case 210 through the second adhesive member 272. Can be. Accordingly, the second light sources 242b of the second light source unit 242 may face the second direction, that is, the downward direction. That is, the top surface of the second light source 242b may be disposed to face the bottom surface of the bottom case 210. More specifically, the second light source 242b may be disposed on the bottom surface of the second printed circuit board 241a.

Accordingly, the first and second light source units 241 and 242 may be disposed in opposite directions to each other.

In addition, an example of the second adhesive member 272 may be a double-sided tape or an adhesive.

The mounting surface of the second printed circuit board 242a of the second light source unit 242 may include a reflective material. Here, the reflective material may be coated or attached on the mounting surface of the second printed circuit board 242a to prevent the light of the second light source unit 242 from directly exiting the liquid crystal panel 100. Examples of the reflecting material may be a paste or metal film including metal powder. Here, the second printed circuit board 242a may be formed of a plurality of wires and an insulating layer. In this case, the reflective material may be contained in the insulating layer constituting the printed circuit board. That is, the insulating layer of the printed circuit board may serve as a reflective layer.

The light guide plate 230 serves to uniformly guide the light provided from the first and second light source units 241 and 242 to the liquid crystal panel 100. The light guide plate 230 may be accommodated in the bottom case 210 and disposed between the first and second light source units 241 and 242. In this case, the first and second light source units 241 and 242 may be disposed to face each other and be parallel to each other. Accordingly, each of the first and second light source units 241 and 242 may be arranged to emit light toward both sides of the light guide plate 230 facing each other.

Here, the first light sources 241b of the first light source unit 241 are disposed on the first printed circuit board 241a, and the second light sources 242b of the second light source unit 242 are the second printed circuit board. It may be disposed below the (242a). At this time, the first printed circuit board 241a of the first light source unit 241 is attached to the bottom surface of the bottom case, and the second printed circuit board 242a of the second light source unit 242 is the bottom surface of the support main. It may be attached to. In addition, the first and second light source units 241 and 242 may be symmetrically disposed with respect to the diagonal direction of the light guide plate 230. Here, the first and second light sources 241b and 242b may be disposed to be parallel to two edge lines symmetrically in the diagonal direction of the light guide plate 230. In addition, the first printed circuit board 241a may be disposed on the lower surface of the light guide plate 230, and the second printed circuit board 241b may be disposed on the upper surface of the light guide plate 230.

Accordingly, the first and second light source units 241 and 242 are disposed to surround two edges of the light guide plate 230 which are diagonally symmetrical, so that the light guide plate 230 is formed of the first and second light source units 241 and 241. It may be arranged compactly between the 242. In addition, as the occurrence factor of light leakage is eliminated due to the compactness between the light guide plate 230 and the first and second light source units 241 and 242, it is possible to prevent a decrease in luminance.

Although the light guide plate 230 is formed to have a predetermined thickness in the drawing, the shape of the light guide plate 230 is not limited in the embodiment of the present invention. For example, the thickness of the light guide plate 230 may be thinner than the sides of the light guide plate 230 in order to reduce the overall thickness of the backlight unit.

In addition, the backlight unit 200 may further include a reflector 220 disposed between the bottom surface of the bottom case 210 and the light guide plate 230. The reflective plate 220 may serve to increase light efficiency by reflecting light traveling toward the bottom surface of the bottom case 210 to the light guide plate 230.

In addition, the optical sheet 260 on the light guide plate 230, for example, a diffusion sheet 261 for diffusing the light emitted from the light guide plate 230, and a light collecting sheet 262 for condensing the light diffused in the diffusion sheet 261. And protective sheets 263 for protecting the light collecting sheet 262 may be further disposed.

The support main 250 is fastened to the bottom case 210 accommodating the first and second light source units 241 and 242, the reflecting plate 220, the light guide plate 230, and the optical sheets 260. Here, the support main 250 has a polygonal frame shape. For example, the support main 250 may have a rectangular frame shape. In this case, the support main 250 may include one side having an opening. Here, both sides of the first light source unit 241 may be disposed below one side having an opening of the support main 250. In addition, the support main 250 may further include a seating step 252 formed along the outer bottom of the support main 250 to be seated on the bottom case 210 to be described later. The seating step 252 may have a stepped shape recessed inward from an outer lower portion of the support main 250.

Here, when the support main 250 and the bottom case 210 are fastened, the seating step 252 may be disposed on the top surface of the bottom case 210. Accordingly, the support main 250 may be stably disposed on the bottom case 210 by the mounting step 252 of the support main 250.

In addition, the support main 250 may be provided with a guide step portion 251 on the lower side of the other side facing one side having an opening. The guide step portion 251 may be formed at an inner lower portion corresponding to an outer lower portion of the support main 250 on which the mounting step portion 252 is formed. In detail, as illustrated in FIGS. 2 and 3A, the guide step portion 251 may be a lower region extending inwardly from the inner bottom of the support main 250. Accordingly, the guide step 251 may have a stepped shape recessed in the inner lower portion of the support main 251. In this case, the extension may be made only on one side of the support main 250.

That is, the guide step 251 of the support main 250 faces the bottom case 210 and is formed in an area corresponding to the second light source unit 242. In this case, the second light source unit 242 is disposed along the guide stepped portion 251 having a stepped shape recessed in the inner lower portion. Accordingly, the guide step 251 of the support main 250 guides the attachment of the second light source unit 242 to stably and easily attach the second light source unit 242 to the support main 250. have.

In addition, a fourth adhesive member 274 is further disposed between the second light source 242b of the second light source unit 242 and the bottom surface of the bottom case 210, thereby replacing the second light source unit 242 with the bottom case ( 210 can be stably fixed. In this case, the fourth adhesive member 274 may be disposed to further extend under the light guide plate 230. In addition, the fourth adhesive member 274 may be further extended between the bottom surface of the bottom case 210 and the support main 230. Accordingly, the fourth adhesive member 274 may stably fix the light guide plate 230 and the support main 250 on the bottom case 210.

Therefore, as in the exemplary embodiment of the present invention, as the first and second light source units are disposed on both sides of the light guide plate to be opposite to each other and symmetrically arranged in the diagonal direction of the light guide plate, the comb of the liquid crystal display device as well as the backlight unit is provided. The packing can be realized and the luminance deterioration can be improved.

4 to 7 are cross-sectional views illustrating a manufacturing process of a backlight unit included in a liquid crystal display according to a second exemplary embodiment of the present invention. Here, the second embodiment of the present invention is a process for manufacturing the backlight unit of the first embodiment described above. Accordingly, since the second embodiment of the present invention has the same technical configuration as that of the first embodiment, repeated descriptions of the first embodiment will be omitted, and the same reference numerals will be given to the same technical configuration. .

Referring to FIG. 4, a support main 250 is provided to manufacture a backlight unit according to an exemplary embodiment of the present invention. Here, the support main 250 may have a polygonal frame shape including one side having an opening. For example, the support main 250 may have a rectangular frame shape. In addition, the support main 250 may include a guide stepped part 251 recessed inward in a lower portion of the other side facing one side having an opening. In addition, the support main 250 is a mounting step 252 formed at an outer side corresponding to the inner side of the support main 250 having the guide stepped portion 251 formed thereon so as to be easily mounted on the bottom case 210 to be described later. It may be further provided.

After providing the support main 250, the second light source unit 242 is attached to the guide step 251 of the support main 250. Here, the second light source unit 242 may include a plurality of second light sources 242b and a second printed circuit board 242a on which the plurality of second light sources 242b are mounted. Here, the second printed circuit board 242a may include a mounting surface for mounting the second light sources 242b and an adhesive surface facing the mounting surface. At this time, the second adhesive member 272 is formed on the adhesive surface of the guide stepped portion 251 or the second printed circuit board 242a, and then the second light source unit 242 is connected to the second adhesive member 272 through the second adhesive member 272. It may be attached to the support main 250. Here, the mounting surface of the second printed circuit board 242a may further include a reflective material.

Referring to FIG. 5, a bottom case 210 is provided separately from attaching the second light source unit 242 to the support main 250.

The first light source unit 241 is seated along one side of the bottom case 210. Here, the first light source unit 241 may include a plurality of first light sources 241b and a first printed circuit board 241a on which the plurality of first light sources 241b are mounted. The first printed circuit board 241a may have a mounting surface on which the first light sources 241b are mounted and an adhesive surface facing the mounting surface. In this case, the adhesive surface of the first printed circuit board 241a may be disposed on the bottom surface of the bottom case 210. Accordingly, the first light sources 241b may be disposed to face upward.

Here, the bottom case 210 may further include a bend extension part 211 that is bent at an upper edge of one side wall to cover the top surface of the first light source unit 241. That is, one side cross section of the bottom case 210 may have a 'c' shape, and the first light source unit 241 may be inserted into the 'c' of the bottom case 210.

The reflective member 243 may be further disposed on the lower surface of the bent extension part 211 facing the first light source unit 241. Here, the reflective member 243 may be a light source housing of the first light source unit 241. Accordingly, the reflective member 243 may be disposed under the bent extension 211 in the process of mounting the first light source unit 241. In this case, the reflective member 243 may be fixed to the bent extension 211 through the first adhesive member 271 disposed below the bent extension 211. An example of the first adhesive member 271 may be a double-sided tape or an adhesive. In the embodiment of the present invention, the reflective member 243 has been described as being a light source housing, but is not limited thereto, and another example of the reflective member may be a reflective film or a reflective tape. Here, when the reflective member 243 is a reflective tape having an adhesive layer, a separate first adhesive member 271 for fixing the reflective member 243 and the bottom case 210 to each other is not required.

In addition, the fourth adhesive member 274 may be further formed on the other side of the bottom case 210 in a region corresponding to the second light source unit 242 to be described later.

In addition, a third adhesive member 273 may be further formed on the bent extension 211 of the bottom case 210.

Referring to FIG. 6, the reflector 220 is seated inside the bottom case 210.

Thereafter, the light guide plate 230 is seated on the reflector plate 220. In this case, the light guide plate 230 is disposed on one side of the first light source unit 241. Here, one lower surface of the light guide plate 230 may be adhered to the fourth adhesive member 274 so that the light guide plate 230 may be fixed on the bottom case 210.

Although not shown in the drawing, the optical sheets may be mounted on the light guide plate 230.

Referring to FIG. 7, the support main 250 having the second light source unit 242 attached thereto is fastened to the bottom case 210 accommodating the first light source unit 241 and the light guide plate 230. Here, the second light source unit 242 may be disposed along one side surface of the light guide plate facing the other side of the bottom case 210. In this case, the second light source unit 242 may have a direction opposite to the first light source unit 241 and may be accommodated in the bottom case 210. That is, the second light sources 242b may be disposed to face the bottom surface of the bottom case 210. The first and second light source units 241 and 242 may be disposed at two corners symmetrical with respect to the diagonal of the light guide plate. In detail, the first and second light source units 241 and 242 may be disposed to surround two edges of the symmetric light guide plate 230.

Accordingly, as the first and second light source units 241 and 242 are symmetrically disposed about the diagonal of the light guide plate 230, the first light source units are arranged in a line arranged in the bottom case 210. 241, the light guide plate, and the second light source unit 242 may be seated inside the bottom case. As a result, assembling interference between the first and second light source units 241 and 242 and the light guide plate 230 may be reduced, thereby reducing an assembly tolerance between the first and second light source units 241 and 242 and the light guide plate 230. As a result, it is possible to improve the luminance decrease and the poor assembly at the same time.

Here, the bottom case 210 and the support main 250 are not specifically illustrated in the drawing, but the bottom case 210 and the support main 250 correspond to each other and may be coupled to each other through fastening holes and fastening protrusions fastened to each other. Can be.

In addition, the second printed circuit board 242a of the second light source unit 242 attached to the support main 250 may cover the lower surface of the support main 250 facing the light guide plate 230. In this case, since the mounting surface of the second printed circuit board 242a includes a reflective material, light emitted from the second light source unit 242 may be prevented from directly outputting to the liquid crystal panel 100.

Thereafter, the optical sheets 260 on the light guide plate 230, for example, a diffusion sheet 261 for diffusing the light emitted from the light guide plate 230 and a light collecting sheet 262 for condensing the light diffused in the diffusion sheet 261. And protective sheets 263 for protecting the light collecting sheet 262 may be further disposed.

As in the embodiment of the present invention, by mounting inside the bottom case in the order of the first light source unit, the light guide plate and the second light source unit, assembly interference between the light source units and the light guide plate can be reduced, thereby assembling tolerances and assembly of the backlight unit. Defects can be reduced at the same time.

In addition, by arranging light source units respectively provided on both sides of the light guide plate in directions opposite to each other, compactness and prevention of luminance deterioration of the liquid crystal display device as well as the backlight unit may be simultaneously achieved.

100: liquid crystal panel 200: backlight unit
210: bottom case 220: reflector
230: light guide plate 241: first light source unit
242: second light source unit 250: support main
260 optical sheet 300 top case

Claims (19)

Bottom case;
A first light source unit disposed on one side of the bottom case and including a first board and a plurality of first light sources disposed on either side of the first board;
A second light source unit disposed on the other side of the bottom case and including a second board and a plurality of second light sources disposed on either side of the second board;
A light guide plate disposed between the first and second light source units; And
A support main disposed on the light guide plate and fastened to the bottom case; It includes, one side of the second board is facing the bottom surface of the bottom case, one side of the first board is facing the opposite direction of any one surface of the second board,
The other side of the first board is bonded to the bottom surface of the bottom case, and the other side of the second board is bonded to the bottom surface of the support main.
delete The method of claim 1,
And a guide step portion extending from an inner lower portion of the support main to seat the second light source unit.
The method of claim 1,
One side of the second board further comprises a reflective material, the second board is a backlight unit to cover the lower surface of the support main facing the light guide plate.
The method of claim 1,
The first and second light source units are respectively disposed at two edges of the light guide plate symmetrically about a diagonal line.
The method of claim 1,
Each of the first and second light sources is disposed in parallel with two edge lines of the light guide plate symmetrically about a diagonal line.
The method according to claim 6,
The first and second boards are respectively disposed on the lower surface and the upper surface of the light guide plate.
The method of claim 1,
And a reflective member disposed on the first light sources to cover the first light source unit.
The method of claim 1,
And a bonding member interposed between the second light sources and a bottom surface of the bottom case.
The method of claim 1,
And each of the first and second boards is a printed circuit board.
Mounting a first light source unit including a first board and a plurality of first light sources disposed on either side of the first board on one side of the bottom case;
Disposing a light guide plate on one side of the first light source unit;
Attaching a second light source unit to the support main, the second light source unit comprising a second board and a plurality of second light sources disposed on either side of the second board; And
One side of the second board faces the bottom surface of the bottom case, one side of the first board faces the opposite direction of any one surface of the second board, and the second light source unit is the bottom case. And fastening the support main and the bottom case to be disposed between the other side of the inside and the light guide plate.
The mounting of the first light source unit on one side of the bottom case may include attaching the other side of the first board to the bottom surface of the bottom case.
Fastening the support main and the bottom case,
And the support main is fastened to the bottom case in a state in which the other side of the second board is attached to a lower side of the support main facing the bottom case.
12. The method of claim 11,
And each of the first and second light sources is disposed in parallel with two edge lines of the light guide plate symmetrically about a diagonal line.
delete 12. The method of claim 11,
The other surface of the first board is attached to the bottom surface of the bottom case by an adhesive member.
delete The method of claim 11,
And a guide step portion extending from an inner lower portion of the support main to seat the second light source unit.
The method of claim 11,
Further comprising a reflecting member covering an upper portion of the plurality of first light sources,
And a reflective material applied to one side of the second board, wherein the second board covers a lower side of the support main facing the light guide plate.



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