KR20070011751A - Chassis and liquid crystal display device comprising the same - Google Patents

Abstract

A chassis of a liquid crystal display device and a liquid crystal display device including the same are provided to prevent short-circuit of a flexible printed circuit board connecting a liquid crystal panel with a driving circuit while improving rework efficiency and reassembly efficiency, by opening one side wall of a chassis to be combined with a mold frame. A liquid crystal panel(100) displays an image. A mold frame(800) has a predetermined space inside. A chassis(900) is combined with the mold frame and has an open side wall to expose one side of the mold frame. The chassis is installed under the mold frame. Hooks are formed at a side of the mold frame. Combining grooves are formed at side walls of the chassis to be combined with the hooks of the mold frame.

Description

Chassis of liquid crystal display and liquid crystal display including same {CHASSIS AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING THE SAME}

1 is a schematic cross-sectional view of a portion of a liquid crystal display according to the related art.

FIG. 2 is a perspective view schematically illustrating a portion of the lower portion of the liquid crystal display of FIG. 1.

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

4 is a cross-sectional view schematically illustrating a portion of the liquid crystal display of FIG. 3.

5 is a schematic cross-sectional view of a portion of a liquid crystal display according to a second exemplary embodiment of the present invention.

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

FIG. 7 is a schematic cross-sectional view of a portion of the liquid crystal display of FIG. 6.

8 is a schematic cross-sectional view of a portion of a liquid crystal display according to a fourth exemplary embodiment of the present invention.

FIG. 9 is a perspective view schematically illustrating a portion of a lower portion of the liquid crystal display of FIG. 8.

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

FIG. 11 is a schematic cross-sectional view of a portion of the liquid crystal display of FIG. 10.

12 is a schematic cross-sectional view of a portion of a liquid crystal display according to a sixth exemplary embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: liquid crystal panel 220, 240: drive circuit portion

300: upper chassis 400: lamp unit

500: LGP 600: Reflector

700: multiple optical sheet 800: mold frame

900: lower chassis

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a chassis of a liquid crystal display device for preventing short circuit of a flexible printed circuit board connecting a liquid crystal panel and a driving circuit and improving reworkability, and a liquid crystal display including the same. Relates to a device.

The liquid crystal display device has advantages of small size, light weight, and large screen compared with the conventional CRT (Cathode Ray Tube), and its development is being actively conducted. The liquid crystal display device is not only used for laptop computers but also for monitors and large display devices of desktop computers. Its use is expanding its use range rapidly.

The liquid crystal display device displays a desired image on a screen by adjusting the amount of light transmitted according to image signals applied to a plurality of control switches arranged in a matrix form, and directly transmits an external signal to the liquid crystal panel that displays an image. To include a driving circuit and a printed circuit board, a backlight unit for irradiating light to the liquid crystal panel and an external chassis surrounding them.

The structure of such a liquid crystal display will be described in detail with reference to FIGS. 1 and 2. 1 is a cross-sectional view schematically illustrating a portion of a liquid crystal display according to the related art, and FIG. 2 is a perspective view schematically illustrating a portion of a lower portion of the liquid crystal display of FIG. 1.

Referring to FIG. 1, the liquid crystal display device includes a liquid crystal panel 10, a plurality of optical sheets 20, a light guide plate 30, a lamp unit connected to the light guide plate, a reflector plate 40, and a mold frame ( 50), a lower chassis 60, a printed circuit board 70 and a flexible printed circuit board 80.

The mold frame 50 forms a storage space therein, and the reflector plate 40, the light guide plate 30, a lamp unit connected to the light guide plate, and a plurality of optical sheets 20 are sequentially formed in the mold frame 50. Are stacked. Then, the liquid crystal panel 10 is provided.

The lower chassis 60 is installed on the lower surface of the mold frame 50 and is formed to surround side surfaces of the mold frame. In addition, a coupling groove is formed at one side of the lower chassis 60, in which the lower portion of the lower chassis 60 is coupled to the mold frame 50, and a lower surface of the mold frame 50 also corresponds to the coupling groove. It is formed so as to protrude into the shape.

The printed circuit board 70 generates an electrical signal for controlling components necessary for driving the liquid crystal panel, for example, a gate driver IC and a source driver IC, and controls a digital data signal input from a computer. A timing controller, a DC-DC converter circuit for generating different kinds of voltages, a gamma standard voltage generator for voltage outputting the gray scale of the source driver IC, and the like are attached. The printed circuit board 70 to which these components are attached is connected to the liquid crystal panel 10 by the flexible printed circuit board 80.

The flexible printed circuit board 80 is connected to the data line and the gate line of the liquid crystal panel 10, and the flexible printed circuit board 80 connected to the liquid crystal panel is bent along sidewalls of the mold frame 50. It is connected to the printed circuit board 70 installed under the lower chassis 60 through a coupling groove under the lower chassis 60.

When the liquid crystal panel 10 and the printed circuit board 70 are connected to each other as described above, the flexible printed circuit board 80 may be shortened by a rough cross section of the coupling groove of the lower chassis 60. A problem occurred. In addition, when reworking, after removing the lower chassis 60 surrounding all four sides of the mold frame 50, the work must be performed, there was a disadvantage in that reworkability is poor.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned conventional problems, and a technical problem to be achieved by the present invention is to prevent a short of a flexible printed circuit board connecting a liquid crystal panel and a printed circuit board on which components for driving the liquid crystal panel are arranged. In addition, the present invention provides a chassis of a liquid crystal display for improving reworkability and a liquid crystal display including the same.

According to an aspect of the present invention for achieving the object of the present invention, the liquid crystal is coupled to the mold frame of the liquid crystal display device, in order to expose one side of the mold frame, the liquid crystal characterized in that the side wall is opened A chassis of the display device is provided.

The chassis may be installed under the mold frame.

A hook is formed at a side of the mold frame, and a coupling groove coupled to the hook of the mold frame is formed at a side wall of the chassis.

According to another aspect of the present invention for achieving the object of the present invention, a liquid crystal panel for displaying an image, a mold frame having a predetermined space therein and the mold frame are combined, and one side of the mold frame In order to expose, a liquid crystal display comprising a chassis formed such that one sidewall is opened.

The chassis may be installed under the mold frame.

The lower surface of the mold frame is characterized in that the protrusion is formed.

At least three protrusions are formed along a circumference of a lower surface of the mold frame.

And an interface substrate coupled to the protrusion and spaced apart from the chassis by a predetermined interval.

A hook is formed on the side wall of the mold frame, and the coupling groove is formed on the chassis to be coupled to the hook of the mold frame.

A reflection plate, a light guide plate, and a plurality of optical sheets are installed in the inner space of the mold frame.

A groove having a predetermined size is formed on the lower surface of the mold frame.

In the groove formed on the lower surface of the mold frame, predetermined parts are mounted.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

3 is an exploded perspective view of a liquid crystal display according to a first exemplary embodiment of the present invention. The liquid crystal display shown in FIG. 3 is mainly used in a small liquid crystal display such as a mobile communication terminal, and includes a backlight assembly using an LED as a light source. The liquid crystal display includes a liquid crystal panel 100 and a driving IC. 150, a main flexible printed circuit board (FPC) 180, a lamp unit 400, a flexible printed circuit board (FPC) 450, a plurality of optical sheets 700, a mold frame 800, and a light guide plate 500. ), A reflector 600, and a lower chassis 900.

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

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

The driving IC 150 is connected to the liquid crystal panel 100, applies a predetermined gate signal to a gate line of the TFT substrate, and applies a predetermined data signal to a data line. The main flexible printed circuit board (FPC) 180 is electrically connected to the liquid crystal panel 100 and the driving IC 150, and various circuit components are mounted on the main FPC.

The lamp unit 400 is used as a light source of the liquid crystal panel 100. In the present embodiment, three LEDs are used, but the present invention is not limited thereto. The LED is disposed on the flexible printed circuit board (FPC) 450, and the FPC 450 on which the LED is mounted is disposed on one side of the mold frame 800.

The light guide plate 500 changes the light generated by the LED into light having an optical distribution in the form of a surface light source. As the light guide plate 500, a wedge type plate or a parallel flat plate may be used.

As the reflective plate 600, a plate having a high light reflectivity is used, which is installed to contact the bottom surface of the lower chassis 900. Although the reflective plate 600 is illustrated as having a flat shape in the drawing, the reflective plate 600 may be manufactured in a curved shape having a reference reflective surface and a triangular protrusion protruding from the reference reflective surface. In addition, the reflective plate 600 may be omitted by forming a material having excellent reflection efficiency on the bottom surface of the lower chassis 900.

The plurality of optical sheets 700 are disposed on the mold frame 800 to uniform the luminance distribution of the light emitted from the light guide plate 500.

The mold frame 800 is formed in a predetermined space, a lamp unit 400 is installed at one side of the mold frame, a light guide plate 500 and a reflecting plate 600 are installed inside the mold frame, and the light guide plate ( A plurality of optical sheets 700 are installed on the upper portion of the 500. Although not shown in the drawing, a hook 810 may be formed on the sidewall of the mold frame 800, and the hook 810 is used as a means for engaging with the lower chassis 900.

The lower chassis 900 is installed under the mold frame 800, and the lower chassis 900 is formed in a shape surrounding the side of the mold frame 800 in a state where one side wall is opened. . As a result, one sidewall of the mold frame 800 is exposed. In addition, the lower chassis 900 is provided with a coupling groove 910 coupled to the hook 810 in a region corresponding to the hook 810 formed on the side wall of the mold frame 800 (not shown).

4 is a cross-sectional view schematically illustrating a portion of the liquid crystal display of FIG. 3.

Referring to FIG. 4, a reflecting plate 600, a light guide plate 500, and a plurality of optical sheets 700 are sequentially stacked in an inner space of the mold frame 800, and a liquid crystal panel 100 is installed on an upper portion thereof. It is.

A lower chassis 900 is installed below the mold frame 800, and the lower chassis is coupled to the mold frame 800 with one sidewall open.

The main FPC 150 connected to the liquid crystal panel 100 is bent along the sidewalls of the mold frame 800 and is installed below the lower chassis 900. In this case, circuit components mounted on the main FPC 150 are mounted in grooves formed under the mold frame.

As described above, when one side wall of the lower chassis 900 is opened and one side wall of the mold frame 800 is exposed, a short occurrence probability of the main FPC 150 by the lower chassis 900 may be Significantly reduced.

5 is a schematic cross-sectional view of a portion of a liquid crystal display according to a second exemplary embodiment of the present invention.

The liquid crystal display shown in FIG. 5 has a protrusion 820 formed on the mold frame 800 and further includes an interface substrate 1000 coupled to the protrusion. similar.

A protrusion 820 is formed around the lower surface of the mold frame 800, and the protrusion 820 has a space for mounting a component including the main FPC 150 under the lower chassis 900. And an interface substrate 1000 for supporting such a component.

At this time, the protrusion 820 may be formed at least three or more around the lower surface of the mold frame 800, preferably, the protrusion 820 is formed on each of the lower surface of the mold frame 800 It is formed at the corner.

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

The liquid crystal display illustrated in FIG. 6 includes an edge type backlight assembly, which is mainly used in a small and medium-sized liquid crystal display such as a laptop computer and a desktop computer. The liquid crystal display includes an upper chassis 300 and a liquid crystal panel ( 100, a driving circuit unit 220 and 240, a plurality of optical sheets 700, a lamp unit 400, a light guide plate 500, a reflecting plate 600, a mold frame 800, and a lower chassis 900.

The driving circuits 220 and 240 are connected to the liquid crystal panel 100, and include a gate side printed circuit board 224 for mounting a control IC and applying a predetermined gate signal to a gate line of the TFT substrate 120. And a data side printed circuit board 244 for mounting a control IC (integrated circuit) and applying a predetermined data signal to a data line of the TFT substrate 120, and a TFT substrate 120 and a gate having an exposed ground pattern. The gate side flexible printed circuit board 222 for connecting between the side printed circuit boards 224 and the data side for connecting between the TFT substrate 120 and the data side printed circuit board 244 with an exposed ground pattern. Flexible printed circuit board 242.

The gate side and data side printed circuit boards 224 and 244 are connected to the gate side and data side flexible printed circuit boards 222 and 242 to apply a gate driving signal and an external image signal. In this case, the gate side and data side printed circuit boards 224 and 244 may be integrated to form a single printed circuit board.

In addition, the flexible printed circuit boards 222 and 242 are equipped with a driving IC (not shown), and the LCD (Read, Green, Blue) signals generated from the printed circuit boards 224 and 244, digital power supplies, etc. To 100. In the exemplary embodiment of the present invention, a tape-automated bonding (TAB) mounting method is described as an example. Alternatively, a COG installed in a thin film transistor substrate is not mounted on the flexible printed circuit boards 222 and 242. (Chip On Glass) It can also be applied to the mounting method.

The upper chassis 300 is formed in a rectangular frame having a flat portion and a sidewall portion that are bent at right angles so as to prevent the liquid crystal panel 100 and the driving circuit parts 220 and 240 from being separated from each other and to protect from the impact applied from the outside. do.

The lamp unit 400 includes a lamp 410 and a lamp clamp 411. The lamp 410 is effective to use a cold cathode ray tube lamp. In addition, the shape of the lamp 410 may be an I-shape as shown, and is not limited thereto, and may have various shapes such as an N-shape, an M-shape, and a meandering shape. The lamp clamp 411 reflects the light emitted radially from the cold cathode ray tube lamp in one direction to maximize the light utilization efficiency.

The light guide plate 500 is combined with the lamp clamp 411 to change light having an optical distribution in the form of a line light source generated by the lamp unit 400 to light having an optical distribution in the form of a surface light source. As the light guide plate 500, a wedge type plate or a parallel flat plate may be used.

As the reflective plate 600, a plate having a high light reflectivity is used, which is installed to contact the bottom surface of the lower chassis 900. Although the reflective plate 600 is illustrated as having a flat shape in the drawing, the reflective plate 600 may be manufactured in a curved shape having a reference reflective surface and a triangular protrusion protruding from the reference reflective surface. In addition, the reflective plate 600 may be omitted by forming a material having excellent reflection efficiency on the bottom surface of the lower chassis 900.

The optical sheet 700 is disposed on the light guide plate 500 to uniform the luminance distribution of the light emitted from the light guide plate 500.

The mold frame 800 has an accommodating space formed in the mold frame, wherein the accommodating space includes a light guide plate 500 and a light guide plate 500 coupled to the lamp unit 400. The reflective plate 600 installed at the lower portion and the plurality of optical sheets 700 installed at the upper portion of the light guide plate 500 are inserted. In this case, a hook 810 may be formed on the sidewall of the mold frame 800, and the hook 810 is used as a means for coupling with the lower chassis 900.

The lower chassis 900 is installed below the mold frame 800, and the lower chassis 900 is formed in a form surrounding the side of the mold frame 800 in a state in which one side wall is opened. As a result, one sidewall of the mold frame 800 is exposed. In addition, the lower chassis 900 has a coupling groove 910 coupled to the hook 810 in a region corresponding to the hook 810 formed on the sidewall of the mold frame 800.

FIG. 7 is a schematic cross-sectional view of a portion of the liquid crystal display of FIG. 6.

Referring to FIG. 7, a reflecting plate 600, a light guide plate 500 coupled to a lamp unit (not shown), and a plurality of optical sheets 700 are sequentially stacked in the storage space of the mold frame 800. The liquid crystal panel 100 is provided at the top.

A lower chassis 900 is installed below the mold frame 800, and the lower chassis is coupled to the mold frame 800 with one side wall open.

The data side printed circuit board 244 is installed under the lower chassis 900. The data side flexible printed circuit board 242 connected to the liquid crystal panel 100 is bent along sidewalls of the exposed mold frame 800 and connected to the data side printed circuit board 244. As a result, the probability that a short occurs in the data side flexible printed circuit board 242 is significantly reduced. In the present exemplary embodiment, the data-side printed circuit board 244 is illustrated below the lower chassis 900, but is not limited thereto.

8 is a schematic cross-sectional view of a portion of a liquid crystal display according to a fourth exemplary embodiment of the present invention.

The liquid crystal display of FIG. 8 has the protrusion part 820 formed on the mold frame 800 and further includes an interface substrate 1000 coupled to the protrusion part. Same as the device.

A protrusion 820 is formed around the lower surface of the mold frame 800, and the protrusion 820 provides a space in which a component of the liquid crystal display device is to be mounted under the lower chassis 900. It is coupled with the interface substrate 1000 for supporting the component. At this time, the protrusion 820 may be formed at least three or more around the lower surface of the mold frame 800, preferably, the protrusion 820 is formed on each of the lower surface of the mold frame 800 It is formed at the corner.

FIG. 9 is a perspective view schematically illustrating a portion of the lower part of the liquid crystal display of FIG. 8, wherein the interface substrate 1000, the data side flexible printed circuit board 242, and the data side printed circuit board 244 are omitted. It became.

As described above, the data side flexible printed circuit board (not shown) is bent along the sidewall of the mold frame 800 and connected to the data side printed circuit board (not shown) to be mounted on the dotted line portion. .

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

The liquid crystal display illustrated in FIG. 10 includes a direct backlight assembly that is mainly applied to a large information display device. The liquid crystal display includes an upper chassis 300, a liquid crystal panel 100, and a driving circuit unit 220. 240, a mold frame 800, a plurality of optical sheets 710, a diffuser plate 720, a lamp unit 400, a reflector plate 600, and a lower chassis 900.

The liquid crystal display of FIG. 10 differs from the liquid crystal display of FIG. 6 only in the position of the mold frame 800 and only some of the components inserted into the storage space of the mold frame, and the remaining components are the same. Hereinafter, only the different components will be described in detail.

The plurality of optical sheets 710, the diffusion plate 720, at least one lamp unit 400, and the reflecting plate 600 are sequentially stacked from the base surface of the storage space formed under the mold frame 800, and the mold Coupled with the frame 800, a lower chassis 900 for supporting the components is formed. In this case, a hook 810 may be formed on the sidewall of the mold frame 800, and the hook 810 is used as a means for coupling with the lower chassis 900.

The lower chassis 900 is installed under the mold frame 800, and the lower chassis 900 is formed in a form surrounding the side surface of the mold frame 800 in a state in which one side wall is opened. As a result, one sidewall of the mold frame 800 is exposed. In addition, the lower chassis 900 has a coupling groove 910 coupled to the hook 810 in a region corresponding to the hook 810 formed on the sidewall of the mold frame 800.

The lamp unit 400 includes a plurality of bar lamps 410 arranged in parallel, a plurality of lamp fixing parts 420 for fixing the lamps, and a lamp support part in which the plurality of lamp fixing parts 420 are accommodated. 430. The plurality of lamps 410 mainly use cold cathode fluorescent lamps, each of the lamps 410 is composed of a glass tube, inert gas contained in the glass tube, and a negative electrode and a positive electrode provided at both ends of the glass tube. Each of the lamp fixing parts 420 includes a base substrate on which one end of the lamp 410 is seated, and a fixing clip and a fixing protrusion for protruding from the base substrate to fix the lamp. The lamp support 430 includes a bottom surface on which the plurality of lamp fixing parts 420 are mounted and a sidewall extending vertically from the bottom surface. In this case, the lamp fixing part 420 may be formed of a conductive material to apply power to the electrode of the lamp 410. In this case, the lamp support 430 is formed of an insulating material to electrically insulate the electrode of the lamp 410 from the lower chassis 800.

The reflective plate 600 has a reflective bottom surface on which the lamp 410 is located, and first and second reflective slopes having predetermined slopes from the reflective bottom surface at edges corresponding to opposite sides of the lamp unit 400. It includes.

The diffusion plate 720 directs light incident from a plurality of lamps toward the front of the liquid crystal panel 100, diffuses the light to have a uniform distribution in a wide range, and irradiates the liquid crystal panel 100 with an optical sheet. The 710 serves to change the light incident at an oblique angle among the light incident to the optical sheet 710 to be outputted vertically.

FIG. 11 is a schematic cross-sectional view of a portion of the liquid crystal display of FIG. 10.

Referring to FIG. 11, the lower chassis 900 is coupled to the mold frame 800 in a state in which one side wall is opened at a lower portion of the mold frame 800.

The reflecting plate 600, the plurality of lamps 410, the diffusion plate 720, and the plurality of optical sheets 710 are stacked on the lower chassis 900.

The data side printed circuit board 244 is installed under the lower chassis 900, and the data side flexible printed circuit board 242 connected to the liquid crystal panel 100 is connected to the exposed mold frame 800. It is bent along sidewalls and connected to the data side printed circuit board 244. Therefore, the probability that a short occurs in the data side flexible printed circuit board 242 is significantly reduced. In the present exemplary embodiment, the data-side printed circuit board 244 is illustrated below the lower chassis 900, but is not limited thereto.

12 is a schematic cross-sectional view of a portion of a liquid crystal display according to a sixth exemplary embodiment of the present invention.

The liquid crystal display illustrated in FIG. 12 has the protrusion 820 formed on the mold frame 800 and further includes an interface substrate 1000 coupled to the protrusion. Same as the device.

What has been described above is merely an exemplary embodiment of the chassis of the liquid crystal display according to the present invention and the liquid crystal display including the same, and the present invention is not limited to the above-described embodiment, and is claimed in the following claims. Likewise, without departing from the gist of the present invention, any person having ordinary knowledge in the field of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, according to the present invention, one side wall of the chassis of the liquid crystal display is opened to be coupled to a mold frame, thereby connecting the liquid crystal panel and a printed circuit board on which components for driving the liquid crystal panel are arranged. Shorting of the flexible printed circuit board is prevented, and reworkability and reassembly are improved.

In addition, by opening one side wall of the chassis of the liquid crystal display, the component mounting area under the chassis is increased.

Claims (12)

In the chassis of the liquid crystal display device, The chassis of the liquid crystal display device coupled to the mold frame of the liquid crystal display device, wherein one side wall is opened to expose one side of the mold frame. The method of claim 1, The chassis of claim 1, wherein the chassis is disposed under the mold frame. The method according to claim 1 or 2, A hook is formed at a side surface of the mold frame, and a chassis of the chassis is formed with coupling grooves coupled to hooks of a mold frame. In the liquid crystal display device, A liquid crystal panel for displaying an image; A mold frame having a predetermined space formed therein and And a chassis coupled to the mold frame and configured to open one sidewall of the mold frame to expose one side of the mold frame. The method of claim 4, wherein And the chassis is installed under the mold frame. The method according to claim 4 or 5, And a protrusion formed on a lower surface of the mold frame. The method of claim 6, And at least three protrusions are formed along a circumference of a lower surface of the mold frame. The method of claim 6, And an interface substrate coupled to the protrusion and spaced apart from the chassis by a predetermined distance. The method according to claim 4 or 5, A hook is formed on the sidewall of the mold frame, and the coupling groove is formed in the chassis is coupled to the hook of the mold frame. The method according to claim 4 or 5, And a reflective plate, a light guide plate, and a plurality of optical sheets are installed in the inner space of the mold frame. The method according to claim 4 or 5, And a groove having a predetermined size is formed in the lower surface of the mold frame. The method of claim 11, And a predetermined component is mounted in the groove formed on the lower surface of the mold frame.

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