KR20070033726A - Backlight Assembly and Liquid Crystal Display Using Same - Google Patents

Abstract

The present invention relates to a backlight assembly and a liquid crystal display device, wherein a fixing pattern is formed under an accommodating member for accommodating the backlight unit, and a tapered mold frame is inserted between the backlight unit and the accommodating member to insert, mount, and Provided are a backlight assembly and a liquid crystal display device capable of improving assembly properties such as alignment.

Backlight assembly, housing member, fixed pattern, mold frame

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY USING THE SAME}

1 is a cross-sectional view of a conventional liquid crystal display device.

2 is a cross-sectional conceptual view illustrating a conventional problem.

3 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

4A is a cross-sectional view of the liquid crystal display shown in FIG. 3.

4B is a cross-sectional view after the liquid crystal display of FIG. 3 is coupled.

5 is a view showing a modification of the mold frame according to the present embodiment.

6A and 6C are conceptual views illustrating the assembly of the backlight assembly according to the present embodiment.

<Explanation of symbols for the main parts of the drawings>

10, 300, 600: storage member 20, 400: backlight unit

30, 500: optical sheet 40, 700: mold frame

50, 200: liquid crystal display panel 1000: display assembly

2000: Backlight Assembly

The present invention relates to a backlight assembly and a liquid crystal display device using the same, and more particularly, to a backlight assembly including a mold frame capable of improving the assemblability of a backlight including a light guide plate and a liquid crystal display device using the same.

Liquid crystal displays (LCDs) have advantages of small size, light weight, and large screen compared to conventional display devices, such as cathode ray tubes (CRTs), and their development is being actively performed. In particular, the liquid crystal display device has been developed to perform a sufficient role as a flat panel display device, and is used not only for display devices of small electronic devices such as camcorders and mobile phones, but also for monitors and large display devices of desktop computers. Is expanding.

The liquid crystal display device displays a desired image on a screen by adjusting the amount of light transmitted according to image signals applied to a plurality of control switches arranged in a matrix form, and directly displaying the image, and an external signal. A driving circuit and a printed circuit board for transmitting, a backlight unit for irradiating light to the liquid crystal display panel, an optical sheet portion for improving the light efficiency of the backlight, and an outer housing member surrounding them.

1 is a cross-sectional view of a conventional liquid crystal display, and FIG. 2 is a cross-sectional conceptual view illustrating a conventional problem.

Referring to FIG. 1, a backlight unit 20 including a light source 21 and a light guide plate 22 is disposed in the lower accommodating member 10, and a plurality of optical sheets 30 are disposed thereon. Thereafter, the mold unit 40 supporting the backlight unit 20 and the optical sheet 30 and supporting the liquid crystal display panel 50 to be disposed thereon is inserted into the lower housing member 10, and then the mold The liquid crystal display panel 50 is positioned on the frame 40. Thereafter, the upper accommodating member 60 and the lower accommodating member 10 are combined to assemble the liquid crystal display.

At this time, the backlight unit 20 is disposed in a top down manner, that is, the backlight unit 20 is disposed on the lower housing member 10, and then a mold is formed between the backlight unit 20 and the lower storage member 10. When the frame 40 is inserted and mounted, its assemblability can be improved. However, in the conventional case, as shown in FIG. 2, when the arrangement of the backlight unit 20 is made incorrectly, or is slipped inside the lower housing member 10 and tilted toward one side wall, the mold frame 40 is inserted and mounted. There is a problem that can not use the top-down method as mentioned above occurs a lot of difficulties.

In order to solve this problem, the backlight unit 20 is conventionally inserted using a bottom up method. In such a bottom-up method, the inconvenience of manufacturing and assembling a jig in order to facilitate the insertion of the backlight unit 20 has occurred, and even when using the jig, there is a problem inferior in assemblability compared to the top-down method. That is, the light guide plate and the reflective sheet move in the assembly process using the bottom up method, which makes it difficult to accurately position them.

Accordingly, the present invention has been made to solve the above problems, and the backlight unit is aligned using the lower housing member, and a mold frame having a taper shape is inserted between the backlight unit and the lower housing member to assemble. An object of the present invention is to provide a backlight assembly and a liquid crystal display device using the same.

In order to achieve the above object, a backlight unit including the lamp, the lamp reflector and the light guide plate of the present invention, an accommodation member for accommodating the backlight unit, and a space between the side wall of the accommodation member and the backlight unit and at least a part of the lower side thereof. Provides a backlight assembly comprising a mold frame having a tapered shape.

Here, it is preferable to include a fixing means for fixing by aligning the movement of the backlight unit on the bottom surface of the housing member. In this case, the fixing means may include a groove or a protrusion, and the bottom surface of the backlight unit may effectively include a protrusion or a groove coupled to the groove or the protrusion. On the other hand, a groove is formed in a portion of the reflecting plate of the backlight unit, the fixing means may include a fixing pattern protruding to be coupled to the groove. A protrusion may be formed on a portion of the reflective plate of the backlight unit, and the fixing unit may include a fixing pattern in which a groove is formed to be fixedly coupled to the protrusion.

The mold frame may have a rectangular frame shape and include an alignment surface for aligning the backlight units. In this case, it is effective that the mold frame further includes a liquid crystal support surface for supporting the liquid crystal display panel and a sheet fixing surface for fixing and supporting the optical sheet. In addition, the alignment surface is an inner surface of a vertical straight line, it is preferable to align the backlight unit by adjusting the width between the alignment surface and the outer wall surface of the mold frame.

The tapered shape may be formed by inclining the surface adjacent to the backlight unit, or by inclining the surface adjacent to the accommodation member, or by inclining the two surfaces adjacent to the backlight unit and the storage member. Do.

In addition, the receiving member and the housing including a backlight unit including a lamp, a lamp reflector and a light guide plate according to the present invention, and fixing means for accommodating the backlight unit and fixing and aligning the movement of the backlight unit on a bottom surface thereof. And a mold frame inserted between the sidewall of the member and the backlight unit to align and fix the backlight unit and the optical sheet.

Here, the mold frame is formed in a rectangular frame shape, it is preferably included in the space between the backlight unit and the housing member, at least a portion of the tapered shape and the alignment surface for aligning the backlight unit.

The mold frame may further include a liquid crystal support surface for supporting the liquid crystal display panel and a sheet fixing surface for fixing and supporting the optical sheet. In this case, it is effective to align the backlight unit by adjusting the width between the alignment surface and the outer wall surface of the mold frame to the inner surface of the vertical straight form.

The tapered shape may be formed by inclining the surface adjacent to the backlight unit, or by inclining the surface adjacent to the accommodation member, or by inclining the two surfaces adjacent to the backlight unit and the storage member. Do.

The fixing means described above may include a groove or a protrusion, and the bottom surface of the backlight unit may include a protrusion or a groove coupled to the groove or the protrusion. In this case, a groove is formed in a portion of the reflective plate of the backlight unit, and the fixing means may include a fixing pattern protruding to be coupled to the groove. A protrusion may be formed on a portion of the reflective plate of the backlight unit, and the fixing unit may include a fixing pattern in which a groove is formed to be fixedly coupled to the protrusion.

In addition, at least a portion of the backlight unit including a lamp, a lamp reflector, and a light guide plate according to the present invention, an accommodating member accommodating the backlight unit, and a sidewall of the accommodating member and a space between the back light unit and the taper are at least partially tapered to facilitate insertion. Provided is a liquid crystal display including a backlight assembly including a mold frame having a shape and a liquid crystal display panel displaying an image by using light supplied from the backlight assembly.

Here, it is preferable to include a fixing means for fixing by aligning the movement of the backlight unit on the bottom surface of the housing member.

The mold frame may be formed in a rectangular frame shape and include an alignment surface for aligning the backlight units.

In addition, a housing including a backlight unit including a lamp, a lamp reflector and a light guide plate according to the present invention, a fixing means for accommodating the backlight unit and fixing and aligning the movement of the backlight unit on a bottom surface thereof; And a backlight assembly including a mold frame inserted between the sidewall of the housing member and the backlight unit to align and fix the backlight unit and the optical sheet, and a liquid crystal display panel to display an image using light supplied from the backlight assembly. A liquid crystal display device is provided.

Here, the mold frame is formed in a rectangular frame shape, it is effective to include an alignment surface for aligning the backlight unit.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

3 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 4A is a cross-sectional view of the liquid crystal display shown in FIG. 3, and FIG. 4B is a cross-sectional view after the liquid crystal display of FIG. 3 is combined. 5 is a view showing a modification of the mold frame according to the present embodiment.

3, 4A, and 4B, the liquid crystal display according to the exemplary embodiment includes a display assembly 1000 disposed at an upper portion and a backlight assembly 2000 disposed at a lower portion thereof.

The display assembly 1000 includes a liquid crystal display panel 100, driving circuits 200 (200a and 200b) and an upper accommodating member 300.

The liquid crystal display panel 100 includes a color filter substrate 110 and a thin firm transistor (TFT) substrate 130. At this time, the color filter substrate 110 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. A common electrode made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) is coated on the front surface of the color filter substrate 110.

The TFT substrate 130 is a transparent glass substrate on which TFTs in matrix form are formed. The data line is connected to the source terminal of the TFTs, and the gate line is connected to the gate terminal. In addition, a pixel electrode made of a transparent electrode made of a transparent conductive material is formed in the drain terminal. When an electrical signal is input to the data line and the gate line, each TFT is turned on or turned off to apply an electrical signal necessary for pixel formation of the drain terminal. When the TFT is turned on by applying power to the gate terminal and the source terminal of the TFT substrate 130, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate 110, thereby forming the TFT substrate 130 and the color. The arrangement of the liquid crystals injected between the filter substrates 110 is changed, and the light transmittance is changed according to the changed arrangement to obtain a desired image.

The driving circuit unit 200 connected to the liquid crystal display panel 100 includes a data side printed circuit board 210a for mounting a control IC and applying a predetermined data signal to a data line of the TFT substrate 130. And a gate side printed circuit board 210b for mounting a control IC and applying a predetermined gate signal to a gate line of the TFT substrate 130, and an exposed ground pattern, the TFT substrate 130 and the data side printed circuit board. A data side flexible printed circuit board 230a for connecting between 210a and a gate side flexible printed circuit board for connecting between the TFT substrate 130 and the gate side printed circuit board 210b with an exposed ground pattern. 230b.

The data side and gate side printed circuit boards 210a and 210b are connected to the data side and gate side flexible printed circuit boards 230a and 230b to apply external image signals and gate driving signals. The data side and gate side printed circuit boards 210a and 210b may be integrated into one printed circuit board and connected to one side of the liquid crystal display panel 100. Of course, the data line and the gate line of the TFT substrate 130 may be exposed to one side for this purpose.

The data side and gate side flexible printed circuit boards 230a and 230b are respectively connected to the data line and the gate line of the TFT substrate 130 to apply the data driving signal and the gate driving signal to the thin film transistor. In addition, the flexible printed circuit board 230 is equipped with a tap (TAB) IC, RGB (Read, Green, Blue) signals, Shift Start Clock (SSC) signals, LP (Latch) generated from the printed circuit board 210 Pulse) signal, gamma analog ground signal, digital ground signal, digital power supply, analog power supply common voltage, accumulated voltage and the like are transmitted to the liquid crystal display panel 100. Of course, an IC may be mounted on the TFT substrate 130.

The upper accommodating member 300 is bent at a right angle to prevent the components of the display assembly 1000 from being detached and to protect the liquid crystal display panel 100 or the backlight assembly 2000 which are easily broken by an impact applied from the outside. It is manufactured in the form of a square frame having a flat portion and a side wall portion. In this case, the planar portion of the upper accommodating member 300 supports a portion of the edge of the liquid crystal display panel 100 at the lower portion thereof, and the sidewall portion is coupled to face the sidewalls of the lower accommodating member 600. The upper accommodating member 300 and the lower accommodating member 600 are preferably manufactured using metal having excellent strength, light weight, and low deformation.

Next, the backlight assembly 2000 accommodates the backlight unit 400, the plurality of optical sheets 500 installed on the backlight unit 400, the backlight unit 400, and the optical sheet 500, and is fixed thereto. The lower accommodating member 600 supporting the backlight unit 400 through the pattern 610, and is inserted into and mounted between the side wall of the lower accommodating member 600 and the backlight unit 400. And a mold frame 700 for aligning and fixing the sheet 500.

The backlight unit 400 includes a lamp 410, a lamp reflector 430, a light guide plate 450, and a reflector 470. The backlight unit will be described below. The lamp 410 is effective to use a cold cathode ray tube lamp. In addition, the shape of the lamp 410 may be an I-shape as shown, and is not limited thereto, and may have various shapes such as a U-shape, an N-shape, an M-shape, and a meandering shape.

The lamp reflector 430 is installed to have a reflective surface on the inner surface of the lamp 410 to surround the lamp 410 to reflect the light from the lamp 410 toward the incident surface of the light guide plate 450 to maximize light utilization efficiency. In addition, as shown in the drawings, a part of the lamp reflector 430 of the present embodiment has a cutting groove coupled to the fixing pattern 610 of the lower housing member 600. Of course, depending on the shape of the fixing pattern 610 may have a shape such as a projection. To this end, the lower surface of the lamp reflector 430, that is, the lamp reflector 430 in an area in contact with the bottom surface of the lower accommodating member 600 is extended and a part of the extended surface is processed by a mechanical method to form a groove or a protrusion. do. Such grooves or protrusions of the lamp reflector 430 may span the fixing pattern 610 of the lower housing member 600 to prevent severe movement of the backlight unit 400 during the assembly process of the backlight assembly 2000. .

In addition, the light guide plate 450 is combined with the lamp reflector 430 to change the light having the optical distribution in the form of a line light source generated by the lamp 410 into light having the optical distribution in the form of a surface light source. As the light guide plate 450, a wedge type plate or a parallel flat plate may be used. In addition, the light guide plate 450 is generally formed of polymethylmethacrylate (PMMA) having high strength and not easily being deformed or broken and having good transmittance.

As the reflective plate 470, a plate having a high light reflectance is used to reduce light loss by reflecting light incident to itself through the rear surface of the light guide plate 450 toward the light guide plate 450. The reflective plate 470 is installed so that a part thereof contacts the bottom surface of the lower accommodating member 600. Although the reflective plate 470 is illustrated as having a flat shape, the reflective plate 470 may be manufactured in a curved shape having a reference reflective surface and a triangular protrusion protruding from the reference reflective surface. In addition, the reflective plate 470 may be omitted by forming a material having excellent reflection efficiency on the bottom surface of the lower accommodating member 600, or the lower accommodating member 600 and the reflective plate 470 may be integrally formed.

The plurality of optical sheets 500 disposed on the backlight unit 400 include a diffusion sheet 510, a polarizing sheet 520, and a brightness enhancement sheet 530, which are disposed on the light guide plate 450. The luminance distribution of the light emitted from the light guide plate 450 is made uniform. The diffusion sheet 510 directs the light incident from the lower light guide plate 450 toward the front of the liquid crystal display panel 100, and diffuses the light to have a uniform distribution in a wide range so as to irradiate the liquid crystal display panel 100. do. As the diffusion sheet 510, it is preferable to use a film made of a transparent resin coated with a predetermined light diffusion member on both surfaces. The polarizing sheet 520 serves to change the light incident obliquely among the light incident on the polarizing sheet 520 to be emitted vertically. This is because the light efficiency increases when the light incident on the liquid crystal display panel 100 is perpendicular to the liquid crystal display panel 100. Therefore, at least one polarizing sheet 520 may be disposed under the liquid crystal display panel 100 to vertically convert the light emitted from the diffusion sheet 510. In this embodiment, two polarizing sheets are used, and a first polarizing sheet which polarizes light of the diffusion sheet in one direction, and a second polarizing sheet which polarizes light in a direction perpendicular to the first polarizing sheet. The brightness improving sheet 530 transmits light parallel to its transmission axis and reflects light perpendicular to the transmission axis. The transmission axis of the brightness improving sheet 530 is preferably the same direction as the polarization axis of the polarizing sheet 520 in order to increase the transmission efficiency. In this case, a predetermined adhesive member (not shown) for adhering to the liquid crystal display panel 100 is formed in the upper edge region of the luminance improving sheet 530.

The lower accommodating member 600 is formed in a box shape of a rectangular parallelepiped in which an upper surface is opened, and an accommodating space having a predetermined depth is formed therein. The lower accommodating member 600 includes a bottom surface and sidewalls extending vertically from each edge from the bottom surface. A fixing pattern 610 is formed on at least a portion of the bottom surface of the lower accommodating member 600 to fix and align the movement of the backlight unit 400 during the assembly process. The fixing pattern 610 may be embossed, and a portion of the bottom surface of the area in contact with the reflector 430 of the backlight unit 400 may be recessed, as shown in the drawing. Of course, the present invention is not limited thereto, and a portion of the bottom surface may protrude to form the fixing pattern 610, and a portion of the bottom surface may protrude and a portion may be recessed. Therefore, as described above, the movement of the backlight unit 400 may be fixed through a part of the reflective plate 430 of the backlight unit 400 and the fixing pattern 610. In addition, the fixing pattern 610 may prevent the backlight unit 400 from being pushed by the mold frame 700 inserted between the backlight unit 400 and the lower accommodating member 600 through a subsequent process. In addition, as shown in FIG. 1, the fixed pattern 610 may be formed in a dot shape, but is not limited thereto and may be formed in a line shape. In the above description, the fixing pattern 610 and the reflecting plate 430 of the backlight unit 400 have been coupled and fixed, but the present invention is not limited thereto. A part of the lower surface of the light guide plate 450 may protrude or a separate protruding pattern may be formed. In combination, the protruding pattern and the fixing pattern 610 may be combined and fixed. In addition, the fixing pattern 610 may include a predetermined coupling member to couple the backlight unit 400 and the lower housing member 600 to each other.

The mold frame 700 may have a rectangular frame shape, and at least one surface of the lower portion 710 having a tapered shape and a liquid crystal display to facilitate insertion into a space between the backlight unit 400 and the lower housing member 600. A liquid crystal support surface 720 for supporting the panel 100 and a sheet fixing surface 750 for fixing and supporting the optical sheet 500 are included. It also includes an alignment surface 770 for aligning the backlight unit 400.

As shown in the drawing, the liquid crystal support surface 730 is bent in an 'L' shape, and the liquid crystal display panel 100 is inserted into the bent region. The sheet fixing surface 750 is bent in a 'b' shape to fix the optical sheet 500 through the bent area and to align them. The alignment surface 770 may be a vertically straight surface to align the backlight unit 400 by adjusting the width between the alignment surface 770 and the outer wall surface of the mold frame 700, and thereby the backlight unit 400. The backlight unit 400 may be fixed by pressing the 400. At this time, the width of the alignment surface 770 and the outer wall surface is preferably the same as the width between the side wall of the target backlight unit 400 and the lower housing member 600.

The lower side 710 is manufactured in a tapered shape, the width of which is narrowed toward the lower side. At this time, the tapered shape of the lower portion 710 may be formed by inclining the surface adjacent to the backlight unit 400, as shown in Figure 4a and 4b, as shown in Figure 5a It may be formed by inclining the surface adjacent to the lower housing member 600, or may be formed by inclining both surfaces as shown in (b) of FIG.

As described above, in the present exemplary embodiment, the backlight unit 400 having the light guide plate 450 may be fixed and aligned through the tapered mold frame 700 and the lower housing member 600 having the fixing pattern 610. have. This will be described below.

6A and 6C are conceptual views illustrating the assembly of the backlight assembly according to the present embodiment.

Referring to FIG. 6A, the cutout of the reflective plate 430 of the backlight unit 400 is fixed to the fixing pattern 610 of the lower housing member 600. As a result, as shown in the drawing, the backlight unit 400 is not completely biased toward the sidewall of the lower accommodating member 600, and a predetermined distance between the reflective plate 430 of the backlight unit 400 and the sidewall of the lower accommodating member 600 is maintained. Will be maintained. Of course, it may be biased to one side as shown in Figure 6a due to the shaking during the assembly process. Thereafter, the lower portion of the tapered mold frame 700 is introduced into the gap between the reflection plate 430 of the backlight unit 400 and the sidewall of the lower accommodating member 600.

Referring to FIG. 6B, since the lower part of the mold frame 700 has a tapered shape, the gap between the reflecting plate 430 of the backlight unit 400 and the side wall of the lower housing member 600 narrows, and the lead portion enters the region therebetween. This becomes possible. At this time, when the width of the left region is narrow and the width of the right region is wide as shown in FIG. 6A, when the mold frame 700 according to the present embodiment is inserted, the narrowed region on the left side is formed by the tapered mold frame 700. It will be pushed to the right. Thereafter, as shown in FIG. 6B, when the alignment surface of the mold frame 700 is retracted, the backlight unit 400 is aligned with the lower accommodating member 600. Referring to FIG. 6C, the mold frame 700 may be continuously inserted and mounted to fix and align the optical sheet 500 and to support the liquid crystal display panel 100. In addition, the light guide plate 450 may be led into the reflective plate 430 of the backlight unit 600. That is, the reflective plate 430 and the lower housing member 600 are fixedly mounted by the fixing pattern 610, and then the tapered mold frame 700 is disposed between the sidewalls of the reflective plate 430 and the lower housing member 600. When inserted into the region, the light guide plate 450 may be automatically inserted into the reflection plate 430 to improve assemblability.

Although the invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the invention is not limited thereto, but is defined by the claims that follow. Accordingly, one of ordinary skill in the art may variously modify and modify the present invention without departing from the spirit of the following claims.

As described above, the present invention can perform insertion, mounting, and alignment of the backlight unit through the mold frame using a top-down method through a tapered mold frame and a lower housing member having a fixing pattern.

In addition, the backlight unit is coupled to the lower housing member before the mold frame is inserted to accurately position the uniaxial position.

Claims (22)

A backlight unit including a lamp, a lamp reflector and a light guide plate; An accommodation member accommodating the backlight unit; And And a mold frame inserted into a space between the side wall of the accommodating member and the backlight unit and having a tapered shape at least a portion of the lower side thereof. The method according to claim 1, And fixing means for fixing and aligning the movement of the backlight unit to the bottom surface of the housing member. The method according to claim 2, The fixing means includes a groove or a protrusion, and a backlight assembly including a protrusion or a groove coupled to the groove or the protrusion on the bottom surface of the backlight unit. The method according to claim 2, Grooves are formed in a portion of the reflecting plate of the backlight unit, and the fixing means includes a fixing pattern protruding to be fixedly coupled to the grooves. The method according to claim 2, A protrusion is formed on a portion of the reflector of the backlight unit, and the fixing means includes a fixing pattern in which a groove is formed to be fixedly coupled to the protrusion. The method according to claim 1, The mold frame may have a rectangular frame shape and include an alignment surface to align the backlight unit. The method according to claim 6, The mold frame further includes a liquid crystal support surface for supporting the liquid crystal display panel, and a sheet fixing surface for fixing and supporting the optical sheet. The method according to claim 6, The alignment surface is a backlight assembly for aligning the backlight unit by adjusting the width between the alignment surface and the outer wall surface of the mold frame to a vertical straight inner surface. The method according to claim 1, The taper shape may be formed by inclining a surface adjacent to the backlight unit, or by inclining a surface adjacent to the accommodation member, or by inclining the two surfaces adjacent to the backlight unit and the accommodation member. A backlight unit including a lamp, a lamp reflector and a light guide plate; An accommodating member accommodating the backlight unit and including fixing means for fixing and aligning a movement of the backlight unit on a bottom surface thereof; And And a mold frame inserted between the sidewall of the housing member and the backlight unit to align and fix the backlight unit and the optical sheet. The method according to claim 10, The mold frame is formed in a rectangular frame shape, the backlight assembly including a lower portion of the tapered shape inserted into the space between the backlight unit and the receiving member, and the alignment surface for aligning the backlight unit. The method according to claim 11, The mold frame further includes a liquid crystal support surface for supporting the liquid crystal display panel, and a sheet fixing surface for fixing and supporting the optical sheet. The method according to claim 11, And the alignment surface is a vertical straight inner surface that aligns the backlight unit by adjusting a width between the alignment surface and an outer wall surface of the mold frame. The method according to claim 11, The taper shape may be formed by inclining a surface adjacent to the backlight unit, or by inclining a surface adjacent to the accommodation member, or by inclining the two surfaces adjacent to the backlight unit and the accommodation member. The method according to claim 10, The fixing means includes a groove or a protrusion, and a backlight assembly including a protrusion or a groove coupled to the groove or the protrusion on the bottom surface of the backlight unit. The method according to claim 15, A groove is formed in a portion of the reflecting plate of the backlight unit, and the fixing means includes a fixing pattern protruding to be fixed to the groove. The method according to claim 15, A protrusion is formed on a portion of the reflector of the backlight unit, and the fixing means includes a fixing pattern in which a groove is formed to be fixedly coupled to the protrusion. A backlight unit including a lamp, a lamp reflector, and a light guide plate, an accommodating member accommodating the backlight unit, and a mold frame having a tapered shape at least partially to facilitate insertion into a space between the side wall of the accommodating member and the backlight unit. A backlight assembly comprising; And And a liquid crystal display panel configured to display an image using light supplied from the backlight assembly. The method according to claim 18, And fixing means for fixing and aligning the movement of the backlight unit on the bottom surface of the housing member. The method according to claim 18, The mold frame may have a rectangular frame shape and include an alignment surface to align the backlight unit. A storage unit including a backlight unit including a lamp, a lamp reflector and a light guide plate, a fixing unit for accommodating the backlight unit and fixing and aligning the movement of the backlight unit on a bottom surface thereof; A backlight assembly inserted between the backlight units and including a mold frame to align and fix the backlight unit and the optical sheet; And And a liquid crystal display panel configured to display an image using light supplied from the backlight assembly. The method according to claim 21, The mold frame may have a rectangular frame shape and include an alignment surface to align the backlight unit.

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