KR101311335B1 - Backlight unit for Liquid Crystal Display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a backlight unit using an LED as a light source and a liquid crystal display device module having the same.

A feature of the present invention relates to a side support that crosses both ends of the MCPCB on which the LED is mounted. More specifically, the protrusion is formed on the side support, and the protrusion is configured to cover the inlet of the cover bottom.

Accordingly, a connecting line electrically connecting the plurality of LEDs mounted on the MCPCB and the LED driving circuit mounted on the back of the cover bottom to control the operation of the LEDs penetrates through the cover bottom through the inlet of the cover bottom. When the connecting line is made of a conventional press cutting surface can solve the problem that the surface was cut or disconnected due to the rough inlet.

LED, LED driving circuit, connecting line, side support, liquid crystal display device

Description

Backlight unit for liquid crystal display device

1 is an exploded perspective view of a liquid crystal display device using a general LED as a light source.

FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1. FIG.

3 is an exploded perspective view of a liquid crystal display using the LED as a light source according to an embodiment of the present invention.

4 is a cross-sectional view taken along the line II-II ′ of FIG. 3.

Figure 5a is a perspective view schematically showing the structure of the side support according to an embodiment of the present invention.

Figure 5b is a plan view schematically showing the shape of the inlet is wrapped by the side support.

6 is a cross-sectional view of a liquid crystal display device using a CCFL fluorescent lamp as a light source.

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

110: liquid crystal panel 122: MCPCB

124: LED 126: Reflective Sheet

130: diffusion sheet 132: diffusion sheet

134: optical sheet 137: connecting line

138: LED drive circuit 139: connector

140: support main 150: cover bottom

151: inlet 160: top cover

170: side supporter 171: protrusion

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a backlight unit using an LED as a light source and a liquid crystal display device module having the same.

Recently, with the development of information technology and mobile communication technology, the development of the display device that can visually display information has been made, and the display device can emit light by the self-emissive display having the light emission characteristics and other external factors. Which are classified as non-luminescent displays.

The non-light emitting display may be an LCD (Liquid Crystal Display).

Since the LCD does not have a light emitting element, it requires a separate light source. As a result, a backlight unit having a light source is provided on the rear surface to irradiate light toward the front of the LCD, thereby realizing an identifiable image.

The backlight unit uses a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescentt Lamp, and a Light Emitting Diode (LED) as a light source.

Among them, LEDs are particularly widely used as light sources for displays with features such as small size, low power consumption, and high reliability.

1 is an exploded perspective view of a liquid crystal display device using a general LED as a light source.

As shown in the drawing, a typical liquid crystal display module includes a liquid crystal panel 10 in which top and bottom substrates are stacked up and down, and a gate printed circuit board 18 is formed at one edge and a source printed circuit board 16 is formed at the other edge adjacent thereto. The backlight unit 20, a support frame 40 having a rectangular frame shape surrounding the side surface thereof, a cover bottom 50 coupled to the support main 40 while covering the back surface of the backlight unit 20, and a liquid crystal panel ( 10) includes a top cover 60 having a rectangular frame shape that is coupled to the front edge of the support main 40.

The backlight unit 20 includes a plurality of metal core printed circuit boards (22, hereinafter referred to as MCPCBs) arranged along the inner surface of the cover bottom 50, and are arranged in a row on each of them. A plurality of LEDs 24 and a pair of side supports 70 across both ends of the plurality of MCPCB 22.

In addition, a plurality of through holes 28 through which the plurality of LEDs 24 can pass are configured to cover the entire inner surface of the MCPCB 22 and the cover bottom 50 except for the plurality of LEDs 24. It includes a reflective sheet 26 of.

The upper portion of the LED 24 exposed through the through hole 28 of the reflective sheet 26 is a transparent window 30 is attached to a plurality of LEDs 24 and reflecting dots 31 corresponding to each of the LEDs 24, A diffusion sheet 32 and a plurality of optical sheets 34 for intervening brightness are interposed therebetween.

In this case, the MCPCB 22 is connected to a separate LED driving circuit (not shown) through a connecting line (not shown) passing through the inlet 51 formed on the cover bottom 50, the LED driving circuit ( The signal applied from the not shown) is applied to the plurality of LEDs 24 through the copper foil pattern (not shown) configured on the MCPCB 22.

Therefore, the LEDs 24 arranged side by side on the MCPCB 22 emit red (R), green (G), and blue (B) colors, respectively, such red (R) and green (G). ), The color of blue (B) is directly reflected with the light or by the reflective sheet 26, the color of red (R), green (G), blue (B) by the transparent window (30) well After mixing, the well-mixed light passes through the plurality of optical sheets 34 when the luminance is uniform by the diffusion sheet 32.

As such, light passing through the plurality of optical sheets is incident on the liquid crystal panel 10, whereby the liquid crystal panel 10 may display an image to the outside.

However, such a general LED backlight unit 20 has some problems.

2 is a cross-sectional view taken along the line I-I ′ of FIG. 1, and the same reference numerals are assigned to the same parts that play the same role as the above description in order to avoid overlapping descriptions. Let's just look at the content.

As shown, the backlight unit 20 of FIG. 1 is provided with an LED driving circuit 38 for controlling the on / off operation of the LED 24 through an external power source. Accordingly, the plurality of LEDs 24 formed on the MCPCB 22 are provided with a connector 39 at one end of the MCPCB 22, thereby connecting the LED driving circuit 38 and the connecting line 37. do.

In this case, the connecting line 37 is connected to the LED driving circuit 38 through the cover bottom 50 through the inlet 51 formed at the bottom surface of the cover bottom 50.

However, the inlet 51 of the cover bottom 50 is in the form of a square hole consisting of four surfaces, and the four surfaces are all made of cut surfaces due to presses, and thus the surfaces of the four surfaces are very rough, and the connecting line 37 is a thin wiring. It is a configuration wrapped in a heat shrink tube. Therefore, if the connecting line 37 is in frequent contact with the cutting surface of the inlet 51, the heat shrink tube of the connecting line 37 is torn, which causes the possibility that the connecting line 37 is cut or disconnected. do.

Accordingly, the present invention has been made to solve the above problems, a backlight unit that can solve problems such as disconnection and disconnection of the connecting line due to the contact between the inlet of the cover bottom and the connecting line, and a liquid crystal display including the same. The purpose is to provide a module.

In order to achieve the object as described above, the present invention comprises a cover bottom configured with a plurality of inlets; A plurality of MCPCBs arranged on the cover bottom and mounted with a plurality of LEDs; A pair of side supports each crossing both ends of the MCPCB, each of which includes a plurality of protrusions surrounding the inner surface and both sides of the inlet; And a connecting line for electrically connecting the LED and the LED driving circuit provided on the bottom of the cover bottom through the inlet, wherein the pair of side supports are each upright of the first and second oblique side surfaces facing each other. The protrusion is composed of two side surfaces and an upper surface, the lower surface bent inwardly from the second side, and the protrusion is bent downward at one end of the lower surface and the first projection surface perpendicular to the lower surface, and the first Provided is a backlight unit for a liquid crystal display device, characterized by comprising first and second protrusion side surfaces formed by bending both sides of the protrusion surface inwardly.

At this time, the inlet is in the form of a square hole consisting of four sides, characterized in that the four sides are cut surface, the first projection surface and the first and second projection side corresponding to the three surfaces of the inlet It features.

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In addition, a copper foil pattern is formed on the MCPCB, characterized in that the copper foil pattern is connected through the connecting line and the connector, the connector is characterized in that configured at one end of the MCPCB.

In addition, the present invention and the cover bottom is composed of a plurality of inlets; A plurality of fluorescent lamps arranged on the cover bottom; A pair of side supports fixed to both ends of the fluorescent lamp, each of which includes a protrusion which is inserted into the inlet and surrounds the inlet; And a connecting line for electrically connecting the fluorescent lamp and the backlight driving circuit provided on the back of the cover bottom through the inlet, wherein the pair of side supports are erected at opposite sides of the first bevel in a direction facing each other. It consists of a second side and the upper surface, the lower surface bent inwardly from the second side,
The protruding portion bent downward at one end of the lower surface includes a first protruding surface perpendicular to the lower surface, and first and second protruding side surfaces formed by bending both side edges of the first protruding surface inward. A backlight unit for a liquid crystal display device is provided.

The present invention also provides a liquid crystal display device comprising: a liquid crystal panel; A plurality of optical sheets provided below the liquid crystal panel; A plurality of optical sheets provided on the lower portion of the liquid crystal panel, a reflective sheet provided on the lower portion thereof, arranged side by side on the reflective sheet, the MCPCB mounted with a plurality of LEDs, and across both ends of the MCPCB A backlight unit including a side support including a protrusion; A support main covering an edge of the liquid crystal panel and the backlight unit; A cover bottom adhered to the rear surface of the reflective sheet and provided with a plurality of inlets corresponding to the MCPCB; And a top cover covering a front edge of the liquid crystal panel, wherein the side support is formed of an oblique first side face facing each other and an upright second side face and an upper face opposite to each other, and bent inward from the second side face. And a protrusion formed by being bent downward at one end of the bottom surface, the first protrusion being perpendicular to the bottom surface, and both edges of the first protrusion being bent inward. It is composed of two protruding side, and the projection of the side support provides a liquid crystal display module characterized in that it is inserted into the inlet to surround it.

And a connecting line penetrating through the inlet to electrically connect the LED and the LED driving circuit provided on the back of the cover bottom.

The present invention also provides a liquid crystal display device comprising: a liquid crystal panel; A plurality of optical sheets provided below the liquid crystal panel; A plurality of optical sheets provided on the lower portion of the liquid crystal panel, a reflective sheet provided below the liquid crystal panel, and arranged side by side on the reflective sheet, a plurality of fluorescent lamps, fixing the both ends of the fluorescent lamps and the projection A backlight unit including a side support including; A support main covering an edge of the liquid crystal panel and the backlight unit; A cover bottom adhered to the rear surface of the reflective sheet and provided with a plurality of inlets corresponding to the fluorescent lamps; And a top cover covering a front edge of the liquid crystal panel, wherein the side support is formed of an oblique first side face facing each other and an upright second side face and an upper face opposite to each other, and bent inward from the second side face. And a protrusion formed by being bent downward at one end of the bottom surface, the first protrusion being perpendicular to the bottom surface, and both edges of the first protrusion being bent inward. It is composed of two protruding side, and the projection of the side support provides a liquid crystal display module characterized in that it is inserted into the inlet to surround it.

At this time, the through-hole further comprises a connecting line for electrically connecting the fluorescent lamp and the backlight driving circuit provided on the cover bottom.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

3 is an exploded perspective view of a liquid crystal display using LED as a light source according to an embodiment of the present invention.

As shown in the figure, the liquid crystal display module includes a liquid crystal panel 110 and a backlight unit 120 on which upper and lower substrates are stacked up and down, a support frame 140 having a rectangular frame shape surrounding the edge thereof, and a backlight unit 120. The cover cover 150 is coupled to the support main 140 while covering the rear surface of the cover), and the top cover 160 is formed in a rectangular frame shape covering the front edge of the liquid crystal panel 110 and coupled to the support main 140. do.

The liquid crystal panel 110 is a part that plays a key role in image expression and is composed of first and second substrates bonded to each other with a liquid crystal layer interposed therebetween. In this case, the gate printed circuit board 118 and the source printed circuit board 116 are connected to each other along the two adjacent edges of the liquid crystal panel 110 by the flexible printed circuit board. They are folded in close contact with the side or the back, and each of them transmits an on / off signal of a thin film transistor (not shown) to a plurality of gate lines (not shown) and an image signal for each frame to a plurality of data lines (not shown).

The back of the liquid crystal panel 110 is provided with a backlight unit 120 to supply the light, MCPCB (122) on the inner surface of cover cover 150 and mounted on the front toward the liquid crystal panel 110 (R) And a plurality of LEDs 124 emitting green (G) and blue (B) light.

In this case, white light is realized by uniform mixing of light emitted from a plurality of LEDs 124 emitting red (R), green (G), and blue (B) light. By using an LED chip 124 configured to emit all the colors of green (G) and blue (B), the white light may be implemented in each LED 124, or include a chip emitting white color. It is also possible to use an LED 124 that emits full white.

Meanwhile, the plurality of LEDs 124 emitting red (R), green (G), and blue (B) light may be bundled and mounted in a cluster, and such clusters may be provided in individualized forms. In this case, when the failure or breakage of some LEDs 124, only the cluster including the corresponding LEDs 124 need to be replaced, thereby greatly reducing the cost and time for repair and replacement.

In addition, the plurality of LEDs 124 mounted on the MCPCB 122 may be arranged side by side on the MCPCB 122 or may be arranged side by side in a plurality of columns.

At this time, the MCPCB 122 uses a metal core board (Metal Core Board), the reason is to quickly discharge the resistance heat generated when the LED 124 emits light to the outside.

The backlight unit 120 also includes a pair of side supports 170 across both ends of the plurality of MCPCB 122, the side support 170 is the cover unit 150 into the backlight unit ( 120 forms a space in which the cover can be mounted, and constitutes a pair of bars coupled to opposite edges of the cover bottom 150.

In addition, a plurality of through holes 128 through which each LED 124 may pass may be provided to cover the inner surface of the MCPCB 122 and the cover bottom 150 except for the LED 124. 126, a transparent window 130 provided thereon and having a plurality of LEDs 124 and reflecting dots 131 corresponding to each other, a diffusion sheet 132 for uniformity of luminance, and reflection thereon. A plurality of optical sheets 134 including a polarizing sheet, a light collecting sheet, a diffusion sheet, and the like are interposed.

Accordingly, the light emitted from the LED 124 is directly or reflected by the reflective sheet 126 to be uniform surface during the process of passing through the transparent window 130, the diffusion sheet 132, and a plurality of optical sheet 134. The light source is processed into a light source and is incident on the liquid crystal panel 110. Using this, the liquid crystal panel 110 finally displays an image of a desired luminance to the outside.

4 is a cross-sectional view taken along the line II-II ′ of FIG. 3, and the same reference numerals are assigned to the same parts that play the same role as the above description in order to avoid overlapping descriptions. Let's just look at the content.

As shown, the LED 124 according to the present invention is controlled by a separate LED driving circuit 138, the LED driving circuit 138 is the cover bottom 150 to the back to minimize the mounting area It is provided.

Accordingly, a connecting line 137 is provided for connecting the LED 124 mounted on the MCPCB to the LED driving circuit 138 provided on the backside of the cover bottom 150, and the connecting line 137 is provided on the cover. The number corresponding to the number of MCPCBs 122 mounted on the bottom 150 is configured.

This is because a plurality of LEDs 124 arranged side by side on the MCPCB 122 are electrically connected to each other through a copper foil pattern (not shown), and thus a plurality of LEDs 124 mounted on the MCPCB 122. Is electrically connected to the LED driving circuit 138 through a connecting line 137 connected to each MCPCB 122. At this time, the copper foil pattern (not shown) formed on the MCPCB 122 and the connecting line 137 are connected through a connector 139 configured at one end of the MCPCB 122.

The connecting line 137 is connected to the LED driving circuit 138 through the cover bottom 150 through the inlet 151 formed on the bottom surface of the cover bottom 150.

At this time, in particular, the present invention effectively prevents cutting and disconnection of the connecting line 137 connecting the plurality of LEDs 124 and the LED driving circuit 138 due to the inlet 151 of the cover bottom 150, which is It is made through the side support (170).

That is, the side support 170 further includes a protrusion 171 covering the cut end of the inlet 151 so that the inlet 151 made of the press cutting surface of the cover bottom 150 does not come into contact with the connecting line 137. Include. This will be described with reference to FIGS. 5A to 5B.

Figure 5a is a perspective view schematically showing the structure of the side support according to an embodiment of the present invention, Figure 5b is a plan view schematically showing a shape in which the inlet is wrapped due to the side support.

As shown in FIG. 5A, the side support 170 has a bar shape covering the one end of the MCPCB (122 of FIG. 4). Specifically, the pair of side support bars 170 face each other. It consists of an oblique first side face 173 in the viewing direction, an upright second side face 175 and an upper face 177 opposite thereto, which are bent inward from the second side face 175 and parallel to the upper face 177. It consists of one lower surface (179).

At this time, one end of the lower surface 179 is further configured with a protrusion 171, the protrusion 171 is bent downward at one end of the lower surface 179, the first protrusion perpendicular to the lower surface 179 The first and second protruding side surfaces 174a and 174b which are bent into the side support 170 at both sides of the surface 172 and the first protruding surface 172, and the protruding portion 171 is Planarly configured in a "c" shape.

Here, the protrusion 171 is configured to have a planar "C" shape, and the connecting line (137 of FIG. 4) is bent into a "C" shape to cover the back cover 150 through the inlet 151. By penetrating, since it is not in contact with one surface of the inlet 151 which is not wrapped through the protrusion 171, only three surfaces of the inlet 151 to which the connecting line 137 of FIG.

These, the protrusion 171 is provided with a plurality along the longitudinal direction of the side support 170, the number thereof is configured to correspond to the number of MCPCB (124 of FIG. 4) mounted on the cover bottom 150. Accordingly, the protrusion 171 corresponds to each inlet 151 of the cover bottom 150, and the inlet through the first protrusion 172 and the first and second protrusion side surfaces 174a and 174b. It surrounds three sides of 151.

That is, as shown in FIG. 5B, the first protruding surface 172 and the first and second protruding side surfaces 174a and 174b of the protruding portion 171 correspond to the three surfaces of the inlet 151, Each side of the inlet 151 is to be covered.

Accordingly, the connecting line (137 of FIG. 4) connected to the connector (139 of FIG. 4) configured at one end of the MCPCB (122 of FIG. 4) and penetrated to the rear surface of the cover bottom 150 through the inlet 151. ) Is frequently in contact with the first protruding surface 172 of the protrusion 171 and the first and second protruding side surfaces 174a and 174b.

In this case, since the side support 170 including the first protruding surface 172 and the first and second protruding side surfaces 174a and 174b of the protruding portion 171 is formed of a plastic series, the first protruding surface 172 and the first and second protruding side surfaces 174a and 174b and the connecting line 137 of FIG. 4 are often in contact with each other, the problem of cutting and disconnection of the connecting line 137 of FIG. 4 does not occur. Do not.

The shape of the protrusion 171 may be variously modified according to the shape of the inlet 151 of the cover bottom 150.

In addition to the above-described LED backlight unit to prevent cutting and disconnection of the connecting line (137 of FIG. 4) of the backlight unit (120 of FIG. 3) through the protrusion 171 of the side support 170, a CCFL fluorescent lamp may be used as a light source. It is also applicable to the backlight unit used as.

6 is a cross-sectional view of a liquid crystal display device using a CCFL fluorescent lamp as a light source.

As illustrated, the support main 240 supporting the liquid crystal panel 210 and the cover bottom 250 are coupled to the rear surface of the support main 240 and the top cover 260 surrounding the edge of the liquid crystal panel 210 is supported by the support main 240. ) And the cover bottom 250.

In addition, the reflective sheet 226, the diffusion sheet 232 and the plurality of optical sheets 234 are stacked in the cover bottom 250, are formed on the reflective sheet 226, and the plurality of protrusions 271. A plurality of fluorescent lamps 222 fixed by the side support 270 including a) and the lamp driving circuit 238 for driving the fluorescent lamp 222 is the inlet 251 of the cover bottom 250 The fluorescent lamp 222 is connected to the fluorescent lamp 222 through a lamp lead line 237 penetrating therethrough, and is mounted on the rear surface of the cover bottom 250.

At this time, the inlet 251 of the cover bottom 250 is in the form of a square hole consisting of a press cutting surface, so as to surround the three surfaces of the press cutting surface through the protrusion 271 of the side support 270. Therefore, even when the connecting line 237 penetrating the rear surface of the cover bottom 250 through the inlet 251 and the protrusion 271 of the side support 270 made of the plastic series are in contact, the connecting line 237 It is possible to prevent problems such as cutting and disconnection of the wires.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

As described above, the LED is mounted on the cover bottom to control the operation of the LED and the LED by configuring a protrusion on the side support according to the present invention, and the protrusion is inserted into the inlet of the cover bottom to surround it. When the connecting line connecting the driving circuit penetrates to the back of the cover bottom through the inlet of the cover bottom, the surface is roughly formed by the existing press cutting surface, thereby solving the problem that the connecting line is cut or disconnected. .

Claims (12)

A cover bottom configured with a plurality of inlets; A plurality of MCPCBs arranged on the cover bottom and mounted with a plurality of LEDs; A pair of side supports each crossing both ends of the MCPCB, each of which includes a plurality of protrusions surrounding the inner surface and both sides of the inlet; A connecting line for electrically connecting the LED driving circuit provided on the rear surface of the LED and the cover bottom through the inlet. / RTI &gt;  The pair of side supports may be formed of an oblique first side surface facing each other, an upright second side surface and an upper surface opposite to each other, and a bottom surface bent inwardly from the second side surface. The protruding portion bent downward at one end of the lower surface includes a first protruding surface perpendicular to the lower surface, and first and second protruding side surfaces formed by bending both side edges of the first protruding surface inward. A backlight unit for a liquid crystal display device, characterized in that. delete delete The method of claim 1, The inlet is in the form of a square hole consisting of four sides, the backlight unit for a liquid crystal display device, characterized in that the four sides are cut surfaces. The method of claim 1, And a first protruding surface and the first and second protruding side surfaces corresponding to three surfaces of the inlet. The method of claim 1, A copper foil pattern is formed on the MCPCB, and the copper foil pattern is connected to the connecting line through a connector. The method of claim 6, And the connector is configured at one end of the MCPCB. A cover bottom configured with a plurality of inlets; A plurality of fluorescent lamps arranged on the cover bottom; A pair of side supports fixed to both ends of the fluorescent lamp, each of which includes a protrusion which is inserted into the inlet and surrounds the inlet; A connecting line electrically connecting the fluorescent lamp and a backlight driving circuit provided on the rear surface of the cover to penetrate through the inlet; / RTI &gt;  The pair of side supports may be formed of an oblique first side surface facing each other, an upright second side surface and an upper surface opposite to each other, and a bottom surface bent inwardly from the second side surface. The protruding portion bent downward at one end of the lower surface includes a first protruding surface perpendicular to the lower surface, and first and second protruding side surfaces formed by bending both side edges of the first protruding surface inward. A backlight unit for a liquid crystal display device, characterized in that. A liquid crystal panel; A plurality of optical sheets provided below the liquid crystal panel; A plurality of optical sheets provided on the lower portion of the liquid crystal panel, a reflective sheet provided on the lower portion thereof, arranged side by side on the reflective sheet, the MCPCB mounted with a plurality of LEDs, and across both ends of the MCPCB A backlight unit including a side support including a protrusion; A support main covering an edge of the liquid crystal panel and the backlight unit; A cover bottom adhered to the rear surface of the reflective sheet and provided with a plurality of inlets corresponding to the MCPCB; Top cover covering the front edge of the liquid crystal panel / RTI &gt; The side support is composed of an oblique first side face facing each other and an upright second side face and an upper face opposite to each other, and a bottom face bent inwardly from the second side face. The protruding portion bent downward at one end of the lower surface includes a first protruding surface perpendicular to the lower surface and first and second protruding side surfaces formed by bending both side edges of the first protruding surface inwardly. , And a protrusion of the side support is inserted into the inlet to surround the inlet. The method of claim 9, And a connecting line penetrating through the inlet to electrically connect the LED and the LED driving circuit provided on the rear surface of the cover bottom. A liquid crystal panel; A plurality of optical sheets provided below the liquid crystal panel; A plurality of optical sheets provided on the lower portion of the liquid crystal panel, a reflective sheet provided below the liquid crystal panel, and arranged side by side on the reflective sheet, a plurality of fluorescent lamps, fixing the both ends of the fluorescent lamps and the projection A backlight unit including a side support including; A support main covering an edge of the liquid crystal panel and the backlight unit; A cover bottom adhered to the rear surface of the reflective sheet and provided with a plurality of inlets corresponding to the fluorescent lamps; Top cover covering the front edge of the liquid crystal panel / RTI &gt; The side support is composed of an oblique first side face facing each other and an upright second side face and an upper face opposite to each other, and a bottom face bent inwardly from the second side face. The protruding portion bent downward at one end of the lower surface includes a first protruding surface perpendicular to the lower surface and first and second protruding side surfaces formed by bending both side edges of the first protruding surface inwardly. , And a protrusion of the side support is inserted into the inlet to surround the inlet. The method of claim 11, And a connecting line penetrating through the inlet to electrically connect the fluorescent lamp and a backlight driving circuit provided on the backside of the cover bottom.

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