KR20090070132A - Backlight unit and display device with the same - Google Patents

Abstract

A backlight unit which is suitable for a display panel of the large-size and a display device including the same are provided to reduce production cost by simplifying a process of the display device. A display panel(110) includes a thin film transistor array substrate and a color filter substrate. A circuit pattern is formed on each bottom chassis. Plural light emitting devices is mounted on the circuit pattern. A surface light source(130) includes the emitting device. As 'bottom chassis is connected to instrument, the surface light source is formed. An optical sheet(140) is mounted on the surface light source.

Description

BACKLIGHT UNIT AND DISPLAY DEVICE WITH THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit using a light emitting element as a light source, and more particularly, by dividing a bottom chassis, printing a circuit pattern directly on the bottom chassis, and mounting a light emitting element, thereby making it suitable for large-sized, The present invention relates to a backlight unit and a display device having the same to simplify the production cost.

With the recent development of semiconductor technology, which is rapidly developing in recent years, the demand for flat panel display devices that are smaller and lighter and has improved performance is exploding.

The liquid crystal display (LCD), which has recently been in the spotlight among the flat panel display devices, has advantages such as miniaturization, light weight, and low power consumption, thereby overcoming the disadvantages of the conventional cathode ray tube (CRT). As an alternative means, it has been gradually attracting attention, and is currently used in almost all information processing apparatuses that require display devices.

A general liquid crystal display device applies voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and visually changes optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. It is a display apparatus which displays information using the modulation of the light by a liquid crystal cell as converting into a change.

Since the liquid crystal display panel of the liquid crystal display device does not emit light by itself, the liquid crystal display panel includes a backlight for providing light to the liquid crystal display panel from under the liquid crystal display panel. In the case of a medium and large liquid crystal display device such as a monitor or a TV, a lamp is used as a backlight. In the case of a lamp, the power consumption is not only large, but also adversely affects device characteristics of the liquid crystal display panel due to heat generation. In addition, since the lamp is typically a bar-shaped, it is not only susceptible to impact, but also has a problem of poor display quality due to a large temperature deviation for each part.

Meanwhile, a light emitting diode (LED) is used as a backlight in a small liquid crystal display of a mobile product such as a cellular phone. Since the light emitting diode is a semiconductor device, it has a long life, a fast lighting speed, low power consumption, strong impact resistance, and an advantage of miniaturization and thinning. Therefore, if the light emitting diode having such an advantage is applied to the medium-large size liquid crystal display device, the problem of the lamp can be solved. That is, by converting a light emitting diode, which is a point light source, into a line light source or a surface light source, a light emitting diode may be gradually used in medium and large LCD products.

1 is a schematic view of a light emitting device module used as a backlight of a conventional liquid crystal display device. FIG. 1A is a sectional view of a light emitting device module, and FIG. 1B is a sectional view of a bottom chassis on which a light emitting device module is mounted.

As shown in the figure, the light emitting device module 10 used as a backlight of a conventional liquid crystal display device includes a printed circuit board 13 on which a plurality of light emitting devices 21 are mounted and the printed circuit board 13. And a heat transfer member 15 attached to the back of the).

An electrode pattern is formed on the printed circuit board 13 to supply a signal to the light emitting device 21, and the heat transfer member 15 emits heat generated from the light emitting device 21 to emit light. 21) to prevent deterioration.

The light emitting device module 10 configured as described above is mounted in the bottom chassis 20 in which the storage space is provided. That is, the light emitting element 21 is mounted on the printed circuit board 13, the heat transfer member 15 is adhered to the lower portion thereof, and then the heat transfer member 15 is mechanically attached to the bottom chassis 20. Will be attached. Alternatively, the heat transfer member 15 may be omitted.

However, in accordance with the trend of larger display panels, such as TVs, printed circuit boards must be enlarged, and thus, there are difficulties in increasing costs and manufacturing.

In addition, conventionally, after mounting the printed circuit board 13 on the bottom chassis, in the assembling process of mechanically fixing it, it takes a lot of time, there is a problem that the productivity is lowered.

In addition, a reflective plate (not shown) containing a reflective material is adhered to the bottom chassis to prevent light loss on the substrate on which the printed circuit board 13 is mounted. Due to the reflective plate adhesion process, the process is more complicated. This leads to an increase in the production cost due to the consumption of the adhesive material.

In addition, when mounting the light emitting device on the printed circuit board 13, in general, the solder material is printed on the substrate 13 using SMT equipment, so that the size of the printed circuit board 13 is increased If so, the SMT equipment also needs to grow together, resulting in a further increase in cost.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to divide a bottom chassis, directly print a circuit pattern on the bottom chassis, and mount a light emitting device so that the display panel is suitable for large-sized display panels. The present invention provides a backlight unit, a backlight unit, and a display device using the same, which can simplify the process.

In order to achieve the above object, the present invention is divided into at least two bottom chassis; A circuit pattern formed on each bottom chassis; A plurality of light emitting devices mounted on the circuit pattern; A surface light source including the light emitting device and formed by mechanically fastening a bottom chassis divided into at least two parts; And an optical sheet mounted on the surface light source.

The bottom chassis is made of decarburized steel, and a surface of the decarburized steel is coated with a reflective material such as titanium dioxide (TiO 2).

Then, the divided bottom chassis, the screw is fastened to the haphole penetrating the bottom chassis to form a surface light source.

The apparatus may further include a guide for accommodating a plurality of optical sheets on an upper surface of the surface light source along the outer edge of the surface light source, wherein the guide is screwed into a bottom hole and a hap hole passing through the guide. It may be fixed to the outer portion of, or may be formed to extend in the upper direction from the bottom chassis.

In addition, the optical sheet, a diffusion sheet; A light collecting sheet on the diffusion sheet; And a protective sheet on the light collecting sheet.

In addition, the present invention is a display panel; And a backlight unit configured to supply light to the display panel, wherein the backlight unit comprises: a surface light source formed by mechanically fastening a plurality of divided bottom chassis to mount a plurality of light emitting devices; And a plurality of optical sheets provided on the surface light source.

The bottom chassis is made of decarburized steel, and a reflective material of titanium dioxide (TiO 2) is coated on the surface of the decarburized steel.

The bottom chassis may include a circuit pattern formed on the reflective material; A mask for protecting the circuit pattern is further included on the circuit pattern except for the SMT pattern.

On the other hand, a guide is formed along a periphery of the surface light source to accommodate a plurality of optical sheets.

In addition, the present invention comprises the steps of preparing a plurality of bottom chassis; Forming a circuit pattern on the bottom chassis; Mounting a light emitting device on the circuit pattern; And mechanically fastening a plurality of bottom chassis mounted with a light emitting element to form a surface light source.

The preparing of the bottom chassis may include preparing a substrate made of decarburized steel; Forming an insulating film on the surface of the substrate; And forming a reflective film on the insulating film, and forming the insulating film on the surface of the substrate may include forming a porcelain enamel on the surface of the substrate by spraying or dipping. Applying an insulating material; And firing the insulating material.

The forming of the reflective film on the insulating film may include applying a reflective material of titanium dioxide (TiO 2) to the surface of the insulating film by spraying or dipping; And firing the reflective material.

Forming a circuit pattern on the bottom chassis includes: printing a circuit pattern on the reflective film; And forming a protective mask partially on the circuit pattern except for the SMT pattern.

The step of mechanically fastening the bottom chassis to form a surface light source is formed by forming a haphole penetrating the bottom chassis and fastening a screw to the haphole.

And forming a guide along the outer edge of the surface light source, wherein the guide forms a haphole through the bottom chassis and the guide, and then tightens a screw to the haphole to form an outer edge of the surface light source. The bottom chassis may be formed on the bottom chassis, or the bottom chassis forming the outer surface of the surface light source may extend upward.

As described above, the present invention divides the bottom chassis into a plurality, and then forms a circuit pattern on each bottom chassis, and mounts a light emitting device, thereby making it suitable for large display devices and simplifying the process to improve productivity. Provide one backlight unit to enable.

That is, as the size of the display panel increases, the size of the backlight for supplying light to the display panel increases together, and as the size of the backlight unit increases, the printed circuit board on which the conventional light emitting device is mounted also increases in size, which makes the process complicated. In addition, since the use of the printed circuit board and the reflection film must be adhered to the surface thereof, the process is complicated and the production cost increases.

Therefore, in the present invention, the process is performed by removing the printed circuit board, dividing the bottom chassis into a plurality, and mounting the circuit pattern and the light emitting element directly on each divided bottom chassis, and then mechanically fastening them. Even if it is simplified and the display panel is enlarged, it is possible to manufacture a backlight unit without burden on equipment, thereby increasing productivity.

As described above, the present invention not only provides a backlight unit suitable for this in accordance with the increase in size of the display device, but also simplifies the process, thereby reducing the production cost and further improving the production efficiency.

Hereinafter, the backlight unit and the display device using the same according to the present invention will be described in detail with reference to the accompanying contents.

2 is a cross-sectional view schematically illustrating a display device according to the present invention.

As shown in the drawing, the display device 100 of the present invention includes a display panel 110 and backlight units 130 and 140 for supplying light to the display panel 110.

The display panel 110 does not generate light by itself, such as a liquid crystal panel. In the case of a liquid crystal panel, the display panel 110 includes a thin film transistor array substrate 110a and a color filter substrate 110b. A liquid crystal layer (not shown) formed between the substrates may be included.

The backlight unit includes a surface light source 130 for supplying light to the liquid crystal panel 110 and an optical sheet 140 provided between the liquid crystal panel 110 and the surface light source 130 to improve light efficiency.

The optical sheet 140 includes a diffusion plate 141 and a light collecting sheet 143 and a protective sheet 145 provided on the diffusion plate 141.

The diffusion plate 141 disperses the light incident from the light emitting unit 130, so that spots due to partial concentration of light are not generated.

The light condensing sheet 143 generates light traveling toward the protective sheet 145 from the diffusion plate 141 so that the light collecting sheet 143 may be vertically processed.

Accordingly, the light passing through the light collecting sheet 143 proceeds vertically and is uniformly distributed with respect to the entire surface of the protective sheet 145, thereby improving luminance.

The surface light source 130 includes a bottom chassis 120 in which a plurality of light emitting devices 129 and the light emitting devices 129 are mounted, and circuit patterns for supplying signals to the light emitting devices 129 are printed. do.

The light emitting device 129 includes a plurality of LED lamps generating R (red), G (green), and B (blue) light in one unit group, or one LED lamp generating white (W) light. It may consist of a unit group of.

When the plurality of LED lamps for generating the R, G, and B light of the light emitting device 129 constitute one unit group, a light mixing lens is used to scatter and uniformly mix the R, G, and B light. It may be configured on the light emitting element.

Meanwhile, the optical sheet 140 and the liquid crystal panel 110 are accommodated on the bottom chassis 120 on which the light emitting device 129 is mounted. In this case, the optical sheet 140 and the liquid crystal panel are formed on the outer side of the bottom chassis 120. A guide 135 is provided to accommodate all of the 110. In addition, the liquid crystal panel 110 is fixed on the optical sheet 140 by a top chassis 150 that presses the edge of the liquid crystal panel 110.

Meanwhile, the bottom chassis 120 is made of a metal material such as decarburized steel, and a reflective film (not shown) reflecting light scattered downward from the light emitting device 129 on the surface thereof. Is formed. In this case, the reflective film may be formed of a material having excellent reflection characteristics such as titanium dioxide (TiO 2).

On the other hand, the bottom chassis 120, a plurality of divided bottom chassis 120 is mechanically fastened, the drawing shows that the two divided bottom chassis 120 is fastened, but the bottom chassis The display panel 120 may be divided in various ways according to the size of the display panel 110, and may be divided into at least two. In addition, it can also be comprised by the single bottom chassis, without dividing.

As shown, the bottom chassis 120 is composed of a first bottom chassis 120a and a second bottom chassis 120b, and the first and second bottom chassis 120a and 120b are mechanically fastened. It is assembled.

3 and 4, the bottom chassis 120 according to the present invention will be described in detail. Each of the divided bottom chassis 120a and 120b includes a light emitting device mounting part 121 in which a light emitting device 129 is mounted. ) And the first fastening portion 123 which protrudes toward the neighboring bottom chassis 120a and 120b and is mechanically fastened to the neighboring bottom chassis 120a and 120b, and the guide 135 is secondly fastened to the mechanism. It consists of a fastening part (125).

In this case, the first fastening part 123 extends in parallel with the inclined surface 123a inclined downward and from the inclined surface 123a to the light emitting device mounting portion 121 to be substantially mechanically fastened. It consists of faces 123b.

In addition, the first fastening parts 123 are alternately formed at positions where the adjacent bottom chassis 120a and 120b are shifted from each other.

That is, when looking at the first fastening portion 123 of the first bottom chassis 120a and the first fastening portion 123 of the second bottom chassis 120b, they are arranged so as to be shifted from each other, so that each of the adjacent bottom chassis It is fitted to the lower portion of the light emitting element mounting portion 121 is assembled.

In more detail, the fastening surface 123b of the first fastening portion 123 of the first bottom chassis 120a is directly inserted under the light emitting device mounting portion 121 of the second bottom chassis 120b. At the same time, the fastening surface 123b of the first fastening portion 123 of the second bottom chassis 120b is inserted under the light emitting element mounting portion 121 of the first bottom chassis 120a. .

As such, the first fastening portions 123 of the first and second bottom chassis 120a and 120b are alternately formed to be inserted under the light emitting element mounting portion 121 of the neighboring bottom chassis 120a and 120b. As shown in FIG. 4, cross sections of one side of the light emitting device mounting unit 121 of the first bottom chassis 120a and one side of the light emitting device mounting unit 121 of the second bottom chassis 120b are mutually different. It abuts to form a flat surface.

On the other hand, in the outer portion of the light emitting device mounting portion 121 in which the first fastening portion 123 is not formed, the inclined surface 125a and its inclined surface 125a are inclined downward, similarly to the first fastening portion 123. The second fastening portion 125 extending in parallel with the light emitting element mounting portion 121 in the outward direction is formed. The second fastening portion 125 is provided to be coupled to the outer guide, and will be described in more detail later.

In FIG. 3, the second fastening part 125 is formed only on one side of the light emitting device mounting part 121, but it is illustrated to help the second fastening part 125 to be understood. The fastening part 125 is formed on all three surfaces of the light emitting device mounting part 121 except for one surface on which the first fastening part 123 is formed.

That is, as shown in FIG. 5, each of the divided bottom chassis 120 has first and second fastening portions 125 extending from the light emitting element mounting portion 121. The first coupling part 123 is formed in an area where the bottom coupling is coupled to the neighboring bottom chassis 123, but all surfaces except for the area where the first coupling part 123 is formed are outside of the light emitting device mounting part 121. It has a second fastening portion 125 extending toward.

Meanwhile, the first and second bottom chassis 120a and 120b assembled through the first fastening part 123 (see FIG. 4) may include a fastening surface of the first fastening part and a light emitting device mounting part fitted over the fastening surface. By inserting the screw into the penetrating haphole, it can be fixed without disassembly.

Referring to the fastening structure of the backlight unit and the bottom chassis of the display device according to the present invention in detail with reference to Figure 2, as shown in the enlarged view of Figure 2, the light emitting device mounting portion of the first bottom chassis (120a) 121 and a coupling means 149 such as a screw are fastened to the haphole 147 penetrating through the fastening surface 123b of the first fastening portion 123 inserted under the light emitting element mounting portion 121, thereby being assembled. The first and second bottom chassis 120a and 120b may be fixed. If necessary, by using a headless coupling screw or by removing the screw head after fastening, it is possible to prevent the formation of unwanted protrusions on the bottom of the bottom chassis 120. At this time, the screw may be fastened to one or more.,

In addition, the second fastening portion 125 and the guide 135 of the bottom chassis 120 are also fastened through the coupling method.

 The guide 135 forms a wall on the outer side of the surface light source 130 and may extend upward from the bottom chassis 120.

However, as illustrated in FIG. 6, the guide 135 may be separately provided to be mechanically fastened to the bottom chassis 120. Herein, coupling means such as screws are omitted, and the guide 135 is installed in all directions along the outer side of the surface light source 130, and the guides provided on one surface of the drawings are omitted for clarity.

In the display device of the present invention configured as described above, after providing a plurality of divided bottom chassis, a reflective material is coated on the surface of each bottom chassis, a circuit pattern is formed thereon, and then a light emitting element is mounted. Next, the divided bottom chassis may be mechanically fastened to obtain a surface light source, and then mounted on the top surface of the surface light source to mount an optical sheet and a display panel.

In particular, the bottom chassis is formed of a rigid metal material such as steel, and after forming an insulating film on the surface, it is possible to sequentially produce a surface light source through a reflective film, a circuit pattern, a light emitting device mounting process.

7A to 7D are cross-sectional views briefly illustrating a manufacturing process of a backlight unit according to the present invention.

First, as shown in FIG. 7A, after preparing a rigid metal plate 121a such as decarburized steel, a fastening part (not shown) is formed through a bending process.

FIG. 8 illustrates a metal plate 121a provided with a fastening part through a bending process, and the first fastening part 123 and a second fastening part for fastening to a neighboring bottom chassis later on the outer side of the metal plate. Each of 125 can be formed.

The metal plate 121a shown in FIG. 7A is a bending process, and the fastening part is omitted.

When the metal plate 121a is provided as described above, as illustrated in FIG. 7B, an insulating film 122 is coated on the surface of the metal plate 121a.

The insulating layer 122 may be formed by applying an insulating material such as porcelain enamel to the surface of the metal plate 121a by spraying or dipping, and then baking the same. Spray methods can be dry or wet.

Subsequently, as shown in FIG. 7C, the reflective film 126 is formed by coating an enamel containing white powder such as titanium dioxide on the surface of the insulating film 122. In this case, the coating of the reflective material may be formed by spraying or dipping in the same manner as the method of forming the insulating layer 122.

Subsequently, as shown in FIG. 7D, after forming the circuit pattern 124 such as Ag paste on the metal plate 121a on which the reflective film 126 is formed, a mask for protecting the circuit pattern 124 ( 127). The mask 127 may be formed using a white enamel.

Meanwhile, the circuit pattern 124 may be formed first, and then the reflective film 126 may be formed.

FIG. 9 is a plan view of the metal plate 121a on which the mask is formed. As shown in the drawing, a circuit pattern 124 is formed on the metal substrate 121a on which the reflective film 126 is formed. The mask 127 which protects the circuit pattern 124 is formed in the area | region except this.

The surface mount technology (SMT) pattern 124a is used for mounting and bonding the light emitting device.

As described above, after the circuit pattern 124 is formed on the bottom chassis 120, a light emitting device (not shown) is mounted through the SMT pattern 124a, and at least two bottom chassis are mechanically mounted. By fastening, it becomes possible to manufacture a surface light source.

In other words, the bottom chassis manufactured through the above processes (FIGS. 7A to 7D) may be used as a surface light source by mechanically combining the bottom chassis according to the size of the display panel.

As described above, the present invention divides the bottom chassis into a plurality of bottom chassis, mounts a circuit pattern and a light emitting device on each bottom chassis, and then mechanically combines them, thereby simplifying the process and increasing the size of the display panel. A suitable surface light source and a display device including the same are provided.

That is, in the related art, a printed circuit board is separately provided, and as the printed circuit board is enlarged, the SMT equipment is also enlarged together, resulting in a complicated process and a large equipment.

However, in the present invention, the printed circuit board is removed and the circuit pattern and the light emitting device are mounted on the bottom chassis, thereby simplifying the process, and the bottom chassis is divided and manufactured according to the enlargement of the display panel. In addition, since the surface light source is formed by combining them again, it is possible to prevent the large size of the SMT equipment for mounting the light emitting device.

As described above, the present invention removes a printed circuit board, at the same time divides the bottom chassis into a plurality, and directly mounts a circuit pattern and a light emitting element on each divided bottom chassis and then mechanically fastens them. If the light source includes only the above contents, all of them will belong to the present invention regardless of the type of display panel, the driving mode, or the type of the mechanism for mounting the display panel, the optical sheet, and the like.

Accordingly, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims also belong to the scope of the present invention.

1 is a schematic view of a light emitting device module used as a backlight of a conventional liquid crystal display device. FIG. 1A is a cross-sectional view of a light emitting device module, and FIG. 1B is a cross-sectional view of a bottom chassis on which a light emitting device module is mounted.

2 is a schematic cross-sectional view of a display device according to the present invention;

3 and 4 show that the divided bottom chassis is assembled mechanically.

5 is a plan view of the bottom chassis.

Figure 6 is a view showing the bottom chassis installed guide.

7A to 7D are cross-sectional views illustrating a process of manufacturing a bottom chassis according to the present invention.

FIG. 8 shows the metal plate of FIG. 7A in detail. FIG.

9 is a top view of FIG. 7D.

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

100: display device 110: display panel

120: bottom chassis 121: light emitting element mounting portion

122: insulating film 123: first fastening portion

124: circuit pattern 125: second fastening portion

126: reflecting film 127: mask

129 light emitting device 130 surface light source

135: guide 150: top chassis

Claims (23)

One or two bottom chassis; A circuit pattern formed on each bottom chassis; A plurality of light emitting devices mounted on the circuit pattern; A surface light source including the light emitting device and formed by mechanically fastening a bottom chassis divided into one or two or more; And An optical sheet mounted on the surface light source; The backlight unit of the display device including a. The method of claim 1, The bottom chassis is a backlight unit of a display device, characterized in that made of decarburized steel. The method of claim 2, And a reflecting material is coated on the surface of the decarburized steel. The method of claim 3, The reflective material is a backlight unit of the display device, characterized in that made of titanium dioxide (TiO2). The method of claim 1, The divided bottom chassis of the backlight unit of the display device, characterized in that a screw is fastened to a hap hole passing through the bottom chassis to form a surface light source. The method of claim 1, And a guide formed along the outer edge of the surface light source to accommodate a plurality of optical sheets on the surface light source. The method of claim 6, The guide unit is a backlight unit of a display device, characterized in that the screw is fastened to the bottom hole and the haphole penetrating the guide is fixed to the outer portion of the surface light source. The method of claim 6, The guide unit is a backlight unit of the display device, characterized in that formed extending from the bottom chassis in the upper direction. The method of claim 1, The optical sheet, Diffusion sheet; A light collecting sheet on the diffusion sheet; And And a protective sheet on the light collecting sheet. Display panel; And It includes a backlight unit for supplying light to the display panel, The backlight unit, A surface light source formed by mechanically fastening a plurality of divided bottom chassis for mounting a plurality of light emitting elements; And A plurality of optical sheets provided on the surface light source; Display configured to include. The method of claim 10, And the bottom chassis is made of decarburized steel. The method of claim 11, And a reflective material of titanium dioxide (TiO 2) is coated on a surface of the decarburized steel. The method of claim 11, A circuit pattern formed on the reflective material; And And a mask for protecting the circuit pattern on the circuit pattern except for the SMT pattern. The method of claim 10, And a guide formed along a periphery of the surface light source to accommodate a plurality of optical sheets. Preparing a plurality of bottom chassis; Forming a circuit pattern on the bottom chassis; Mounting a light emitting device on the circuit pattern; Mechanically fastening a plurality of bottom chassis mounted with a light emitting device to form a surface light source; Method for manufacturing a backlight unit comprising a. The method of claim 15, Preparing the bottom chassis, Preparing a substrate made of decarburized steel; Forming an insulating film on the surface of the substrate; And Forming a reflective film on the insulating film; Method for manufacturing a backlight unit comprising a The method of claim 16, Forming an insulating film on the surface of the substrate, Applying an insulating material of a porcelain enamel to the surface of the substrate by spraying or dipping; And And firing the insulating material. The method of claim 16, Forming a reflective film on the insulating film, Applying a reflective material of titanium dioxide (TiO 2) to the surface of the insulating layer by spraying or dipping; And Firing the reflective material. The method of claim 16, Forming a circuit pattern on the bottom chassis, Printing a circuit pattern on the reflective film; And And forming a protective mask partially on the circuit pattern except for the SMT pattern. The method of claim 15, Mechanically fastening the bottom chassis to form a surface light source, A method of manufacturing a backlight unit, comprising: forming a haphole penetrating the bottom chassis and fastening a screw to the haphole; The method of claim 15, A method of manufacturing a backlight unit, characterized in that it further comprises the step of forming a guide along the outer surface of the surface light source. The method of claim 21, The guide is formed on the outer side of the surface light source by forming a haphole penetrating the bottom chassis and the guide, and then fastening a screw to the haphole. The method of claim 21, The guide, A method of manufacturing a backlight unit, characterized in that the bottom chassis forming the outer surface of the surface light source extending in an upward direction.

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