KR100604678B1 - Direct LCD System - Google Patents

Abstract

Lamp assembly in which the lamp assembly which is not turned on is fixed by dividing the lamp assembly into at least two lamp assemblies in the direct type backlight assembly and installing them on the lower surface of the diffuser plate, and forming a slice slot at a position corresponding to the lamp assembly on the side of the bottom chassis. Easily take the bay out of the LCD and replace the lamp.

Therefore, it is possible to reduce the lamp replacement time, improve workability, and prevent the failure of the driving unit due to the replacement of the lamp assembly.

In addition, the reflective plate may be formed flat, or a trapezoidal protrusion may be formed between the lamp and the lamp. The upper surface of the trapezoidal protrusion may be lower than the center of the lamp to improve light uniformity of the LCD.

Description

Direct lighting type of liquid crystal display}

1 is a cross-sectional view showing the structure of a direct liquid crystal display device according to the present invention.

FIG. 2 is an enlarged view illustrating main parts of an enlarged portion A of FIG. 1; FIG.

Figure 3 is an exploded perspective view showing the structure of the lamp assembly and the reflector according to the first embodiment of the present invention.

4 is a cross-sectional view schematically showing the structure of a liquid crystal display according to a second embodiment of the present invention.

5 is an exploded perspective view showing a lamp assembly and a reflector according to a second embodiment of the present invention.

6 is a plan view for explaining the installation position of the lamp drive unit according to the present invention.

Figure 7 is an exploded perspective view schematically showing the structure of the bottom chassis according to the present invention.

8 is an explanatory diagram showing an installation position of an inverter according to the present invention;

The present invention relates to a direct type liquid crystal display device, and more particularly, to a direct type liquid crystal display device which improves light uniformity of the liquid crystal display market value and makes it easy to replace a lamp assembly installed on the lower surface of the diffusion plate. It is about.

CRT (Cathode Ray Tube), one of the commonly used display devices, is mainly used for monitors such as TVs, measuring devices, information terminal devices, etc., but due to the weight and size of the CRT itself, Could not respond actively to demands.

In order to replace the CRT, a liquid crystal display device having advantages of small size, light weight, and low power consumption has been actively developed, and recently, it has been developed enough to perform a role as a flat panel display device. In addition, as the monitor and the large information display device of the desktop computer is used, the demand for the liquid crystal display device is continuously increasing.

Since most of the liquid crystal display devices are light-receiving devices that display images by controlling the amount of light coming from the outside, a separate light source for illuminating the LCD panel, that is, a backlight assembly, is required. It is divided into edge type and direct type according to the installation position of the assembly.

The edge method is the lamp assembly is installed on the side of the light guide plate for guiding the light, the lamp that emits light, the lamp holder which is inserted at both ends of the lamp and protects the lamp, and the light emitted from the lamp It consists of a lamp reflecting sheet that reflects toward the light guide plate.

The edge type backlight assembly is mainly applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer, and has good light uniformity, long durability, and thinning of the liquid crystal display device. It is advantageous.

On the other hand, as the size of the liquid crystal display device began to be enlarged to 20 inches or more, the direct development method began to focus on directly directing the LCD panel by placing a plurality of lamps on the lower surface of the diffusion plate.

Such a direct type backlight assembly is mainly used for a large screen liquid crystal display device requiring high brightness because the light utilization efficiency is higher than that of the woven method.

However, in the case of the liquid crystal display device adopting the direct method, since many lamps are installed on the lower surface of the diffusion plate, lamps that do not turn on due to the failure and life of the lamp are more likely to appear than the edge method.

In addition, due to the life and failure of the lamp in the edge method in which the lamp assembly is installed on both sides of the light guide plate, for example, when one lamp is not lit, only the brightness on the screen is lowered. However, in the direct method, since lamps are installed on the bottom of the screen, for example, when one lamp does not light up, a part where the lamp does not light up becomes dark due to lamp life and failure. Will appear immediately.

For this reason, lamps must be replaced frequently in direct backlight assemblies.

However, in order to replace a lamp that is not lit, it is necessary to separate the top chassis, the mold frame, and the mold frame and the bottom chassis surrounding the lamp assembly, and then take out the lamp that is not lit and replace it with a new lamp. And workability is reduced.

In addition, when the lamp is frequently replaced, a failure of the driving circuit portion of the liquid crystal display device installed on the bottom surface of the bottom chassis is likely to occur, which may lower the reliability of the liquid crystal display device.

In addition, the part where the lamp is installed in the LCD panel is bright, and the part between the lamp and the lamp, that is, the part where the lamp does not exist, is darker than the part where the lamp is installed, and thus the uniformity of light is deteriorated.

Accordingly, an object of the present invention has been made in view of the above problems, in the liquid crystal display device adopting the direct method is to easily replace the lamp that does not turn on without disassembling the top chassis, mold frame and bottom chassis lamp It is possible to improve workability by reducing the replacement time and to prevent failure of the driving circuit part when replacing the lamp.

Another object of the present invention is to improve the light uniformity of the LCD module.

Still other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

In order to achieve the above object, the present invention provides a bottom chassis coupled to a mold frame, a reflecting plate installed on the bottom surface of the bottom chassis to improve light uniformity, a lamp emitting light, and a lamp fitted to both ends of the lamp. And a lamp assembly configured as a holder and placed on an upper surface of the reflector, wherein a side of the bottom chassis is formed with a slide slot for easily replacing the lamp assembly, and the slide slot is closed by a side cover.

In one example, the reflecting plate is formed flat and the edge portion is bent toward the bottom surface of the bottom chassis so that the portion of the gown of the reflecting plate is spaced apart from the bottom surface of the bottom chassis.

As another example, the reflector may have a flat portion corresponding to the lamp and a protrusion formed between the lamps. The protrusion is spaced apart from the bottom surface of the bottom chassis and extends in the width direction of the reflecting plate, and has a height lower than the center point of the lamp insertion hole from the bottom surface of the bottom chassis.

Hereinafter, the liquid crystal display of the direct type according to the present invention will be described with reference to FIGS. 1 to 8.

As shown in FIG. 1, the direct type liquid crystal display device 100 is fastened to a mold frame 110 having a rectangular through hole formed from an upper surface to a lower surface thereof, and to a lower surface of the mold frame 110. Bottom chassis 120 for closing the lower surface of the), the reflector plate 130, 130a installed on the bottom surface of the bottom chassis 120 reflects light, the lamp assembly installed on the upper surface of the reflector plate (130, 130a) to emit light 200, the diffusion plate 140 installed on the upper part of the lamp assembly 200, the LCD panel 150 and the LCD panel installed on the upper surface of the mold frame 110 to display information by electric and optical properties ( It consists of a top chassis 180 that wraps from the edge of the 150 to the side of the mold frame 110.

For convenience of description, the lamp assembly 200, the reflector plates 130 and 130a and the bottom chassis 120 which are directly related to the present invention will be described.

According to the first embodiment, the lamp assemblies are divided into a plurality and installed in a line along the longitudinal direction of the bottom chassis 120.

Here, the reason why the lamp assembly 200 is divided into a plurality of parts rather than integrally formed is that when an error occurs in any one of the lamps 210, the lamp 210 is abnormally generated. This is to easily replace the lamp 210 after removing the lamp assembly 200 is present to the outside of the liquid crystal display device 100.

As described above, the lamp assemblies 200 divided into the plurality of lamps include a plurality of lamps 210 and one end of the lamps 210 which are used as a light source of the liquid crystal display 100 as shown in FIG. 2 or 3. Two lamp holders 220 which are fitted at the other end and the other end to protect the lamps 210, and lamp supports 230 and 230a which are combined with the respective lamp holders 220 to facilitate replacement of the lamp 210 and the lamps. And a lamp driver 250 electrically connected to the plurality of lamps 210 to light each of the lamps 210.

For convenience of description, each member constituting the lamp assembly 200 will be described with reference to one lamp assembly 200 as an example.

As shown in FIG. 3, one end of each of the lamps 210 protrudes from the hot electrode 212 to which power is input, and the other end of the lamps 210 has a predetermined length of the ground electrode 214 from which the input power is returned. Is formed to protrude.

The length of the lamps 210 is the same as the widthwise length of the diffusion plate 140, and as shown in FIG. 1, the lamps 210 are spaced apart from each other to extend the length of the diffusion plate 140. Are arranged in a line.

Two lamps 210 are installed in one lamp assembly 200, and four lamps 210 are installed in one lamp assembly 200 in the present embodiment.

Meanwhile, two lamp holders 220 inserted into both ends of the lamps 210 are formed in a rectangular shape, and end portions of the lamps 210 are provided on the side of the lamp holder 220 opposite to the ends of the lamps 210. Are inserted into the lamp insertion hole 222 is formed the same number as the lamp (210).

In addition, coupling holes 224 for coupling the lamp holder 220 and the lamp supports 230 and 230a between the lamp insertion holes 222 of the upper surface of the lamp holder 220 facing the diffuser plate 140. Is formed.

The lamp supports 230 and 230a surround both longitudinal sides of the lamp holder 220 from the top surface of the lamp holder 220, and the lamp supports 230 and 230a are easily peeled off from the lamp holder 220 by vibration or shock. In order to prevent the coupling boss 234 is formed on the inner surface of the lamp support (230,230a) facing the coupling hole 224 is fitted into the coupling hole 224.

In addition, the handle 232 protrudes from both ends of the lamp holders 230 and 230a in the longitudinal direction so that an operator can easily take out the lamp assembly 200 to the outside of the liquid crystal display device 100.

Preferably, the handle 232 is formed only on the support 230 which is coupled to the hot electrode 212 of the lamp 210 of the lamp holder 220.

As shown in FIG. 3, the lamp driver 250 electrically converts an inverter 255, an inverter 255, and a hot electrode 212 of the lamp 210 to convert an DC voltage input from an external device into an AC voltage. A hot wire 252 for transferring the AC voltage output from the inverter 255 to the lamp 210 and a ground wire 254 for electrically connecting the inverter 255 and the ground electrode 214 of the lamp 210. It is composed of

Since the inverter 255 is installed to face the hot electrode 212, the hot wire 252 is directly connected to the inverter 255, but the ground wire 254 is bent to the rear side of the reflector 130 and then the reflector 130. It is connected to the inverter 255 via.

Here, when the hot side portions of the lamp assemblies 200 in which the hot electrodes 212 of the lamps 210 are positioned, for example, are installed toward one end in the width direction of the bottom chassis 120, the hot electrodes 212 may face the hot electrodes 212. Inverters 255 to be installed are also placed at one end in the width direction of the bottom chassis 120.

In this case, the space occupied by the inverters 255 is limited by the installation space of various driving circuit devices (not shown) for driving the liquid crystal display device 100, and the inverter 255 and the hot and ground wires 252. Since the liquid crystal display device 100 may malfunction due to the interference between the unwanted frequency generated at the power supply circuit 254 and the driving circuit device, the hot side and the ground side portions of the lamp assemblies 200 may be reduced. The lamp assemblies 200 are installed to be alternately positioned at one end and the other end in the width direction of the bottom chassis 120.

For example, assuming that three lamp assemblies 200 are installed in the liquid crystal display device 100 as shown in FIG. 6, the hot side portions of the odd numbered lamp assemblies 210 are bottom chassis 120. The hot side portion of the lamp assembly 210 is installed on one end in the width direction, and the even side of the lamp assembly 210 is placed on the other end in the width direction of the bottom chassis 120.

Meanwhile, the reflective plate 130 according to the first embodiment is applied to the base plate 132 and the upper surface of the base plate 132 to reflect the light emitted from the lamp 210 to the diffuser plate 140 to provide light. It is comprised by the reflecting film 134 which raises an efficiency.

Here, the reflective plate 130 is formed to be flat in order to prevent streaks caused by a relatively dark portion between the lamps 210 compared to the portion corresponding to the lamp 210 in the LCD panel 150.

In addition, the edge portion of the reflective plate 130 is bent in a "b" shape toward the base surface of the bottom chassis 120. The center portion of the reflector plate 130 is spaced apart from the base surface due to the bent portion 135 bent in a "b" shape. Thus, as shown in FIG. 2, the ground wire 254 may be returned between the reflector plate 130 and the bottom chassis 120. In addition, the support unit 160 couples the bottom chassis 120 and the reflector 130 to prevent the lamp assemblies 200 and the reflector 130 from flowing in the liquid crystal display 100.

The lamp assembly 200 and the reflector 130 according to the second embodiment increase the light efficiency and the uniformity of light as compared to the first embodiment, and the lamp holder 220a as shown in FIGS. 4 and 5. Except for the reflective plate 130a, the structure is the same as that described in the first embodiment, and thus only the lamp holder 220a and the reflective plate 130a will be described.

As shown in FIG. 5, the two holders 220a respectively fitted to both ends of the lamp are formed in a rectangular shape, and the lamps 210 are provided on the side of the lamp holder 220a opposite to the ends of the lamps 210. Lamp insertion holes 222a into which the ends of the lamps are fitted are formed in the same number as the lamp 210.

In addition, coupling holes 224a for coupling the lamp holder 220a and the lamp supports 230 and 230a between the lamp insertion holes 222a of the upper surface of the lamp holder 220a facing the diffuser plate 140. Is formed, and the lower surface of the lamp holder 220a facing the reflecting plate 130 is processed into an uneven shape.

That is, the portion where the lamp insertion holes 222a are formed is formed flat and the portion between the lamp 210 and the lamp 210 is formed with a trapezoidal groove 228a, the center portion of the lamp insertion hole 222a. The height of the trapezoidal groove 228a is formed lower.

The reflector plate 130a coupled to the lamp holder 220a is applied to the base plate 132a and the upper surface of the base plate 132a, as illustrated in FIG. 4, to diffuse light emitted from the lamp 210 into a diffuser plate ( And a reflective film 134a which reflects the light to 140 to increase the light efficiency.

Here, since the reflecting plate 134a is installed on the lower surface of the lamp holder 220a, it is preferable to form the base plate 132a in a shape corresponding to the lower surface of the lamp holder 220 as shown in FIG. 5. .

That is, the portions corresponding to the lamp insertion holes 222a are formed flat, and the portion between the lamp insertion hole 222a and the lamp insertion hole 222a forms a trapezoidal protrusion 138a, where the trapezoidal shape is formed. The upper surface of the protrusion 138a having a shape should be formed lower than the center of the lamp insertion hole 222a from the bottom surface of the bottom chassis.

Most preferably, the trapezoidal protrusion 138a is formed lower than the lower surface of the lamp insertion hole 222a.

This is to prevent the trapezoidal protrusion 138a upper surface from appearing darker than the portion where the lamp 210 is installed.

That is, when the upper surface of the trapezoidal protrusion 138a is higher than the center of the lamp 210, the light emitted from the lamp 210 and the reflected light at the side of the trapezoidal protrusion 138a are immediately spreader plate 140. The light is emitted from the lamp 210 to the upper surface of the trapezoidal protrusion 138a, and the light returned from the diffuser plate 140 toward the reflector plate 130a is secondly reflected. Because it looks dark.

In addition, the longitudinal edge portion of the reflective plate 130a according to the second embodiment is bent toward the upper portion of the storage space formed by the mold frame to form the locking step 135a. The branch 160 is connected to the locking step 135a and the bottom chassis 120 to prevent the lamp assemblies 200 and the reflector 130a from flowing in the liquid crystal display 100.

The supporting portions 160 described in the first and second embodiments of the reflecting plates 130 and 130a are fixed to the longitudinal sidewalls of the bottom chassis 120 to support the edges of the diffuser plate 140, as shown in FIG. 4. Likewise, the holder 165 is formed on the side wall facing the lamp assembly 200. The holder 165 protrudes from the side wall toward the bent portion 135 or the locking step 135a of the reflector plates 130 and 130a to fix the reflector plates 130 and 130a to the bottom chassis 120.

Meanwhile, the lamp holders 220 and 220a as shown in FIG. 7 so that the reflecting plates 130 and 130a and the lamp assemblies 200 can be easily taken out of the liquid crystal display device 100 after the respective members are assembled. In the width side of the bottom chassis 120 facing the) is formed a slide slot 122, the slide slot 122 is formed in a portion corresponding to the position where the lamp assemblies 200 are installed.

Here, when the inverter 255 is divided into one end and the other end in the width direction of the bottom chassis 120, the slide slots 122 are formed on both side surfaces of the bottom chassis 120 in the width direction.

In addition, the side cover 125 for closing the slide slot 122 on both sides or one side in the width direction of the bottom chassis 120 is fastened to the bottom chassis 120 by screws 127.

In addition, as illustrated in FIG. 8, a plurality of through holes 124 are formed on the rear surface of the bottom chassis 120 to draw out the hot wire 252 and the ground wire 254 to the installation position of the inverter 255 to drive the circuit portion. Increase the installation space (not shown).

The assembly of the liquid crystal display device and the lamp assembly or lamp replacement work configured as described above will be described below with reference to the second embodiment as an example.

First, both ends of the lamps 210 are respectively inserted into the lamp insertion holes 222a formed on the side surfaces of the lamp holders 220a, and then the lamp supports 230 and 230a are covered on the upper surfaces of the lamp holders 220a. The coupling boss 234 formed inside the lamp supports 230 and 230a is fitted into the coupling hole 224a formed in the lamp insertion hole 222a so that the lamp holder 220a and the lamp supports 230 and 230a are completely coupled to each other.

Here, the lamp support 230 having the handle 232 is coupled to the upper surface of the lamp holder 220a into which the hot electrode 212 of the lamp 210 is inserted, among the both ends of each lamp 210, which is a lamp assembly. This is because the lamp assembly 200 to be replaced is taken out from the hot side portion where the hot electrode 212 is formed when the 200 is replaced.

Thereafter, the reflecting plate 130a is coupled to the lower surface of the lamp holder 220a, and the ground wire 254 connected to the ground electrode 214 of the lamp 210 is bent to the rear surface of the reflecting plate 130a to form a trapezoidal protrusion. It is positioned toward the hot electrode 212 along 138a.

Subsequently, after installing the reflecting plate 130a coupled to the lamp assembly 200 on the bottom surface of the bottom chassis 120, the reflecting plate 130a is prevented from flowing inside the liquid crystal display device 100 by shock and vibration. In order to install the support unit 160 on both side walls of the bottom chassis 120 in the longitudinal direction, the bottom chassis 120 and the support unit 160 and the bottom chassis are fastened by fastening screws (not shown) to the back of the bottom chassis 120. The 120 and the reflector 130a and the lamp holder 220a are fixed.

At this time, when the support parts 160 are fixed to both side walls of the bottom chassis 120 in the longitudinal direction, the holder 165 formed on the support part 160 is fitted inside the locking projection 130a formed at the end of the reflector plate 130a. The bottom chassis 120 and the end of the lamp assembly 200 are coupled.

As such, when the reflector plate 130a and the lamp assembly 200 are installed on the bottom surface of the bottom chassis 120, the hot wire 252 and the ground wire 254 are bottomed through the through holes 124 as shown in FIG. 8. Pulled out to the rear of the chassis 120 and connected to the inverter 250.

Separately, when the reflector plate 130a and the lamp assembly 200 are installed on the bottom surface of the bottom chassis 120, the side cover 125 is disposed on one side or both sides in the width direction of the bottom chassis 120 in which the slide slots 122 are formed. The slide slot 122 is closed by fastening.

Subsequently, the diffusion plate 140 is installed on the upper surface of the support unit 160, and the bottom chassis 120 and the mold frame 110 are fastened by covering the mold frame 110 on the diffusion plate 140. The LCD panel 150 is placed on the upper surface of the mold frame 110.

Thereafter, the top chassis 180 surrounding the edge of the LCD panel 150 and the side surface of the mold frame 110 is coupled to the mold frame 110.

In order to replace the lamp 210 that is not turned on after driving the assembled liquid crystal display device 100 through the above-described process, first, a side cover installed on one side or both sides in the width direction of the bottom chassis 120. The 125 is separated from the bottom chassis 120 to open the slide slot 122.

Subsequently, after selecting the lamp assembly 200 to which the lamp 210 which is not turned on is fixed among the plurality of lamp assemblies 200, the operator grasps the handles formed at both ends of the lamp support 230 in the longitudinal direction and the lamp assembly 200. To the outside of the liquid crystal display device 100 through the slide slot 122, and then replace the lamp 210 that is not lit with a new lamp (210).

Thereafter, the lamp assembly 200 is introduced into the liquid crystal display 100 in the reverse order when the lamp assembly 200 is taken out of the liquid crystal display 100, and then the slide slot 122 is formed by the side cover 125. ).

 As described above, the present invention divides the lamp assembly into at least two or more lamp assemblies in the direct type backlight assembly, and installs them on the lower surface of the diffusion plate, and forms slice slots at positions corresponding to the lamp assemblies in the side of the bottom chassis. Only the lamp assembly to which the lamp is fixed is easily removed to the outside of the LCD to replace the lamp.

Therefore, the lamp replacement time is reduced, workability is improved, there is an effect that can prevent the failure in the drive unit due to the replacement of the lamp assembly.

In addition, the reflective plate may be formed flat, or a trapezoidal protrusion may be formed between the lamp and the lamp. The upper surface of the trapezoidal protrusion may be lower than the center of the lamp to improve light uniformity of the LCD.

Claims (9)

A mold frame in which a storage space is formed; A reflection plate installed at a base surface of the storage space and having an edge portion bent toward the base surface so that a center portion thereof is spaced apart from the base surface; A support part formed at a side of the storage space near the edge part and having a holder engaged with the bent edge; A plurality of lamp assemblies installed on an upper surface of the reflector to emit light; A diffusion plate installed on an upper surface of the support to diffuse light; And An LCD panel installed on the diffusion plate to display information; Each of the lamp assemblies At least two lamps having a hot electrode formed at one end and a ground electrode formed at the other end to emit light; Lamp holders having a lamp insertion hole formed at a side surface of the lamp opposite to an end of the lamp and fitted to both ends of the lamps; And And a lamp driver connected to the hot electrodes and the ground electrodes of the lamps to blink the lamps. The method of claim 1, wherein the upper surface and the lower surface of the mold frame is penetrated to form the storage space, the bottom chassis of the mold frame to close one surface of the storage space is characterized in that the bottom chassis is further installed. Direct liquid crystal display device. The slide slot according to claim 2, wherein a side surface of the bottom chassis, which faces the hot side portion to which the lamp assembly is supplied, is provided with a slide slot for taking out the lamp assembly to the outside, and the slide slot is formed by a side cover. Direct liquid crystal display device characterized in that the closing. 4. The direct type liquid crystal display of claim 3, wherein lamp supports are further provided on upper surfaces of the lamp holders to easily pull the lamp assemblies out of the bottom chassis through the slide slots. The method of claim 4, wherein the coupling holes for fixing the lamp support is formed between the lamp insertion hole of the upper surface of the lamp holder, And a coupling boss is formed in a portion of the lower surface of the lamp support opposite to the upper surface of the lamp holder to correspond to the coupling hole. The method of claim 2, wherein the lamp driving unit An inverter installed to face the hot side of the lamp assembly and converting a DC voltage input from an external device into an AC voltage and outputting the alternating voltage; A hot wire electrically connecting the inverter and the hot electrode to transfer an AC voltage output from the inverter to the lamps; And And a ground wire electrically connecting the inverter and the ground electrode. [7] The method of claim 6, wherein the hot side parts and the ground side parts of the lamp assemblies are alternately positioned at one end in the width direction of the bottom chassis so that the inverters are divided into one end and the other end in the width direction of the bottom chassis. Direct LCD system. 7. The liquid crystal display of claim 6, wherein a plurality of through holes are formed in a rear surface of the bottom chassis corresponding to the hot side to pull out the hot wire and the ground wire to a position where the inverter is to be installed. Device. A mold frame in which a storage space is formed; A reflection plate installed at a bottom surface of the storage space and having an edge portion bent toward an upper portion of the storage space; A support part installed at a side of the storage space near the edge part and having a holder engaged with the bent edge part; A plurality of lamp assemblies installed on an upper surface of the reflector to emit light; A diffusion plate installed on an upper surface of the support to diffuse light; An LCD panel installed on the diffusion plate to display information; And A bottom chassis covering the base surface and engaging with the mold frame; Each of the lamp assemblies At least two lamps having a hot electrode formed at one end and a ground electrode formed at the other end to emit light; Lamp holders having a lower surface facing the reflector is formed in a concave-convex shape, the lamp insertion hole is formed on the side opposite to the end of the lamp and fitted to both ends of the lamps; A lamp driver connected to the hot electrodes and the ground electrodes of the lamps to blink the lamps; And The bottom chassis covers the base surface and is coupled to the mold frame. The shape of the reflective plate corresponds to the shape of the lower surface of the lamp holder, the portion of the reflective plate corresponding to the lamp insertion holes is formed flat, the portion corresponding to the lamp insertion hole is spaced apart from the base surface And a protrusion extending in the width direction of the reflector and having a height lower than a center point of the lamp insertion hole from the base surface. A side surface of the bottom chassis opposite to the hot side portion to which the power supply of the lamp assembly is supplied is formed with a slide slot for taking out the lamp assembly to the outside, and the slide slot is directly closed by a side cover. Liquid crystal display device.

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