KR101818464B1 - Liquid Crystal Display - Google Patents

Abstract

A liquid crystal display device according to an embodiment of the present invention has an object to realize a narrow bezel by disposing a light source housing on a front surface of a printed circuit board and reducing a space between the light source and the light incident surface of the light guide plate.
A liquid crystal display device according to an embodiment of the present invention includes: a liquid crystal panel that displays an image on a front surface; A light guide plate for emitting light from a rear surface of the liquid crystal panel; A light source disposed on at least one side of the light guide plate; A printed circuit board for mounting the light source; A light source housing attached to a front surface of the printed circuit board; And an opening for opening the light source housing in which the light source is mounted, wherein the light source housing is thicker than the light source so that the light source does not contact the light guide plate.

Description

[0001] Liquid crystal display [0002]

Embodiments of the present invention relate to a liquid crystal display, and more particularly, to a liquid crystal display capable of minimizing the width of a bezel.

BACKGROUND ART Liquid crystal displays (LCDs) represent principles of image realization by optical anisotropy and polarization of a liquid crystal.

In such a liquid crystal display device, a liquid crystal panel in which liquid crystal layers are interposed between two adjacent substrates is an essential component, and the direction of arrangement of liquid crystal molecules is changed to an electric field in the liquid crystal panel to realize a difference in transmittance.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight unit having a light source is disposed on the back surface of the liquid crystal panel.

Here, a light emitting diode (LED) as a light source of a backlight unit is widely used as a light source for display, having characteristics such as small size, low power consumption and high reliability.

1 is a cross-sectional view of a liquid crystal display device using a general LED as a light source.

As shown in the figure, a typical liquid crystal display comprises a liquid crystal panel 10, a backlight unit 20, a support main 30, a bottom cover 50, and a top cover 40. The liquid crystal panel 10 is constituted by thin film transistors and color filter substrates 12 and 14 which face each other with a liquid crystal layer (not shown) interposed therebetween, which plays a key role in image display.

A backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 includes an LED assembly 29 arranged along the longitudinal direction of at least one edge of the support main body 30, a white or silver reflective sheet 25 seated on the bottom cover 50, A light guide plate 23 that is seated on the sheet 25, and a plurality of optical sheets 21 interposed therebetween.

The LED assembly 29 is formed on one side of the light guide plate 23 and includes a plurality of LEDs 29a emitting white light and an LED printed circuit board 29b mounted with the LEDs 29a Circuit board ").

The liquid crystal panel 10 and the backlight unit 20 are covered with a top cover 40 covering the upper edge of the liquid crystal panel 10 in a state where the edge is surrounded by the support main 30 having a rectangular frame shape, And the bottom cover 50 are integrally joined to each other through the support main body 30.

As shown, an LED 29a is arranged along one side of the light guide plate 23 of the modular liquid crystal display device, and the LED 29a is mounted on the printed circuit board 29b to mount the LED assembly 29 .

The LED assembly 29 is fixed to the LED housing 27 by adhesion or the like, so that the light emitted from the plurality of LEDs 29a faces the light incidence surface of the light guide plate 23.

The LED housing 27 mounts the LED assembly 29 and fixes the position of the LED assembly 29 and diffuses heat generated from the LED assembly 29.

The light emitted from each of the LEDs 29a is incident on the light incident surface of the light guide plate 23 and then refracted toward the liquid crystal panel 10 inside the light guide plate 23. The light reflected by the reflection sheet 25, And is supplied to the liquid crystal panel 10 while being processed into a more uniform high-quality surface light source while passing through the liquid crystal panel 21.

However, a liquid crystal display device including such a backlight unit 20 involves several problems. Referring to the drawing, it can be seen that a constant distance d is widened between the LED 29a and the light incident surface of the light guide plate 23 Able to know.

The reason why the interval d is formed is to prevent breakage due to contact between the light guide plate 23 and the LED 29a.

The light guide plate 23 has a large heat due to light received from the LED 29a when the LCD is operated. However, since the material of the light guide plate 23 shrinks and expands due to heat, when the distance d between the LED 29a and the light-incident surface is excessively narrow, the light guide plate 23 and the light- The LED 29a can be brought into contact. In this case, since the LED 29a may be damaged, a constant distance d is formed between the light-incoming surface and the LED 29a.

However, the distance d between the LED 29a and the light-incident surface is increased, thereby lowering the luminous efficiency.

Also, the interval d has a result that the width of the bezel b on the upper top cover 40 is enlarged. Since the bezel (b) is an upper surface portion of the top cover that covers the inactive area of the liquid crystal panel and the bezel (b) is an area where no screen is displayed, the enlargement of the width of the bezel have.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to minimize the width of the bezel by changing the structure of the light source housing and the printed circuit board and forming the light source housing thicker than the light source.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel displaying an image on a front surface; A light guide plate for emitting light from a rear surface of the liquid crystal panel; A light source disposed on at least one side of the light guide plate; A printed circuit board for mounting the light source; A light source housing attached to a front surface of the printed circuit board; And an opening for opening the light source housing in which the light source is mounted, wherein the light source housing is thicker than the light source so that the light source does not contact the light guide plate.

Preferably, the light source is a plurality of LEDs spaced apart from each other, and the light source housing is formed thicker than the plurality of LEDs in each of the spacing spaces of the plurality of LEDs.

Further, the light source housing is formed to extend from a lower portion of the opening toward a back surface of the light guide plate.

Further, the liquid crystal display panel further includes a top cover surrounding the top edge of the liquid crystal panel.

Further, the light source housing covers the back surface of the light guide plate and is coupled with the top cover.

Further, the back surface of the printed circuit board is in close contact with the inner surface of the top cover.

According to another aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel for displaying an image on a front surface; A light guide plate for emitting light from a rear surface of the liquid crystal panel; A light source disposed on at least one side of the light guide plate; A printed circuit board for mounting the light source; A light source housing attached to a front surface of the printed circuit board; And a light source protecting member protruding from the light source housing toward the light guide plate so that the light source does not contact the light guide plate.

Preferably, the light source housing further includes an opening that opens an area where the light source is mounted.

The liquid crystal display device according to at least one embodiment of the present invention configured as described above is characterized in that the printed circuit board is disposed on the rear surface of the light source housing and the space between the LED and the light incident surface is narrowed, By removing the configuration,

The width of the bezel can be minimized.

In addition, it is possible to improve the brightness of the liquid crystal display device by improving the light incident efficiency of the light guide plate of the LED.

Further, the reliability of the LED can be improved by protecting the LED from expansion due to heat of the light guide plate.

In addition, a large heat dissipation effect can be achieved by making the direction of heat diffusion that the LED assembly transmits to the light source housing in one direction.

1 is a cross-sectional view of a liquid crystal display device using a general LED as a light source.
2 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention.
3A is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.
FIG. 3B is a partial perspective view showing a state in which the light source housing and the light source assembly of the first embodiment of the present invention are combined. FIG.
4A is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.
FIG. 4B is a partial perspective view illustrating a light source housing and a light source assembly according to a second embodiment of the present invention.
4C is an exploded perspective view of a light source housing and a light source protecting member according to a second embodiment of the present invention.

Hereinafter, a liquid crystal display according to embodiments of the present invention will be described in detail with reference to the drawings.

In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

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

1, the liquid crystal display device 101 includes a liquid crystal panel 110, a backlight unit 120, a support main body 130, and a top cover 140.

First, the liquid crystal panel 110 plays a key role in image display. The liquid crystal panel 110 includes a thin film transistor (TFT) substrate 112 and a color filter substrate (not shown) (114).

Although not shown in the drawing, a plurality of gate lines and data lines cross each other on the inner surface of the thin film transistor substrate 112, pixels are defined, and thin film transistors are provided at each of the intersections to form transparent pixel electrodes One-to-one correspondence.

On the inner surface of the color filter substrate 114, a color filter of red (R), green (G), and blue (B) colors corresponding to each pixel and a color filter And a black matrix (black matrix) covering non-display elements such as transistors. In addition, a transparent common electrode covering these elements is provided.

A polarizer (not shown) selectively transmitting only specific light is attached to the upper and lower outer surfaces of the two substrates 112 and 114, respectively.

The liquid crystal panel 110 is connected to the circuit board 117 via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) along at least one edge thereof, And is properly brought into close contact with the side surface of the main body 130 or the back surface of the bottom cover 150 as appropriate.

When the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit to be scanned, the liquid crystal panel 110 transmits the signal voltage of the data driving circuit to the corresponding pixel electrode through the data line And the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby exhibiting a difference in transmittance.

In addition, a backlight unit 120 is provided to supply light from the rear surface of the liquid crystal panel 110 so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed.

The backlight unit 120 includes a light source assembly 129, a white or silver reflective sheet 125, a light guide plate 123 seated on the reflective sheet 125, and a plurality of optical sheets 121 ).

The light source assembly 129 is located at one side of the light guide plate 123 so as to face the light incident side of the light guide plate 123. The light source assembly 129 includes a light source 129a and the light source 129a, And a printed circuit board 129b.

The light source 129a may be a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescent Lamp (EEFL), or a Light Emitting Diode (LED).

In the first embodiment of the present invention, the LED is selected as the light source 129a. When the light source 129a is an LED, light having red (R), green (G), and blue (B) colors is emitted forward toward the light incoming surface of the light guide plate 123, By lighting all at once, white light by color mixing can be realized. On the other hand, it is also possible to use white LEDs that emit white light, or white LEDs that emit white light, using LEDs that emit RGB colors (not shown) .

A plurality of LEDs emitting RGB light may be bundled into one cluster, and a plurality of LEDs mounted on the printed circuit board 129b may be arranged in a line on the printed circuit board 129b Or arranged in a row in a plurality of rows.

The printed circuit board 129b is an electronic circuit board that prints a wiring pattern (not shown) on an insulating layer such as resin or ceramic to enable electrical connection with mounting of various electronic elements. The printed circuit board 129b is an epoxy Series FR4 printed circuit board, an F printed circuit board (flexible printed circuit board), and an MC printed circuit board.

In recent years, MC printed circuit boards have been used more frequently in order to quickly dissipate heat generated from the light source 129a. In this case, when the circuit board is formed as an MC printed circuit board, an insulating layer (not shown) such as a polyimide resin material for electrical insulation between a MC printed circuit board made of a metal and a wiring pattern desirable.

At this time, heat of high temperature generated from the light source 129a is transmitted to the printed circuit board 129b and is emitted to the outside and the light source housing 127.

The light source housing 127 guides the light source assembly 129.

The light source housing 127 is made of a metal such as aluminum and includes an opening 127a corresponding to the light source 129a on the printed circuit board 129b and a thermal diffusion unit 127b corresponding to the light guide plate 123 do.

In this case, the opening 127a is disposed on the front surface of the printed circuit board 129b, and the light source 129a is opened so that the light source 129a can emit light toward the light incidence surface, Shape.

Here, the opening 127a and the printed circuit board 129b may be bonded by an adhesive material such as a double-sided tape or a bond.

The opening 127a is formed to be thicker than the light source 129a in a direction in which the light source 129a faces the light entrance surface of the light guide plate 123. [

The reason why the opening 127a is formed thick is as follows. The light guide plate 123 may be made of any one of PMMA (polymethyl methacrylate), PET (polyethylene terephthalate), PC (poly carbonate), and PEN (polyethylene naphthalate). However, when the light source 129a and the light guide plate 123 come into contact with each other at this time, the light source 129a may be damaged. Therefore, the opening 127a is formed thick to protect the light source 129a.

The opening 127a may be formed by removing only a part of the rectangular opening 126a by a pressing process so that only a portion where the light source 129a is to be inserted is opened to a square plate having a thickness larger than the thickness of the light source 129a. The formation of the opening 127a proceeds simply by adding the press processing in the conventional processing method without adding any other components.

In addition, the opening 127a may be thicker than the light source 129a by machining only the surfaces that are on the same line as the surface on which the light source 129a is formed.

The thermal diffusion unit 127b has a shape extending in the back direction of the light guide plate 123 and the reflective sheet 125 to cover the entire back surface of the light guide plate 123 and the reflective sheet 125. [

The thermal diffusion unit 127b diffuses the heat generated from the printed circuit board 129b to the opening 127a and diffuses the heat toward the back surface of the light guide plate 123 in one direction.

The light source housing 127 can prevent light loss by concentrating the light emitted from the light source assembly 129 toward the light guide plate 123 together with the protection of the light source assembly 129, Can be improved.

Further, the light source housing 127 is engaged with the top cover 140 at the side of the light source housing 127, and may serve as a bottom cover. In this case, since the installation process of the bottom cover is omitted, the cost and time of the process can be shortened.

However, the light source housing 127 does not serve as a bottom cover, but the bottom cover may be separately disposed on the lower surface of the light source housing 127 and coupled to the top cover 140.

The light guiding plate 123 uniformly spreads the light incident from the light source 129a to a wide area of the light guide plate 123 and travels through the light guide plate 123 by total reflection to provide the surface light source 129a to the liquid crystal panel 110 do.

At this time, the backlight unit 120 having the above-described structure can arrange a plurality of light sources 129a in multiple layers on the printed circuit board 129b according to the purpose.

Further, it is also possible to arrange the light source assemblies 129 on at least one side of the light guide plate 123 in a plurality of sets.

Hereinafter, this will be described in more detail with reference to Figs. 3A and 3B. FIG. 3A is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 3B is a partial perspective view illustrating a state in which a light source housing and a light source housing are coupled according to a first embodiment of the present invention.

3A, a plurality of optical sheets 121 are stacked on the reflective sheet 125, the light guide plate 123, the light source assemblies 129 and 129, and the light guide plate 123 to form a backlight unit 120).

A liquid crystal panel 110 in which a thin film transistor and color filter substrates 112 and 114 and a liquid crystal layer (not shown) are interposed therebetween is disposed on the backlight unit 120 and a thin film transistor, Polarizers 119a and 119b for selectively transmitting only specific light are attached to the outer surfaces of the light sources 112 and 114, respectively.

The backlight unit and the liquid crystal panel 110 are surrounded by the support main body 130. The backlight unit 127 is coupled to the rear surface of the backlight unit and the liquid crystal panel 110 and the top cover 140 covering the top edge and the side surface of the liquid crystal panel 110, Is coupled to the support main body 130 and the light source housing 127.

The light source 129a faces the light incident surface of the light guide plate 123 so that light emitted from each light source 129a enters the light incident surface of the light guide plate 123 and is refracted toward the liquid crystal panel 110 And is supplied to the liquid crystal panel 110 while being processed into a more uniform high-quality surface light source 129a while passing through the plurality of optical sheets 121 together with the light reflected by the reflective sheet 125. [ The component not described in the drawing is the fixing member 165 of the liquid crystal panel.

The light source assembly 129 is disposed in close contact with the inner surface of the top cover 140.

At this time, the opening 127a of the light source housing 127 is attached to the printed circuit board 129b. Since the light source 129a is hidden by the opening 127a of the light source housing 127, the light source 129a is not shown in the sectional view, but is indicated by a dotted line in the drawing.

This is described in more detail in FIG.

A plurality of light sources 129a of the light source assembly 129 are mounted on the printed circuit board 129b at predetermined intervals and receive driving power from the outside. The portion where the light source 129a is mounted is open and has a shape surrounding the light source 129a.

Since the opening 127a is formed thicker than the light source 129a in the direction of the light entrance surface, the light guide 129a may be in contact with the light source 129a even if the light guide plate 123 expands. Therefore, in FIG. 3A, the interval d between the light source 129a and the light incident surface of the light guide plate 123 can be narrowed.

In addition, since the printed circuit board 129b is mounted on the rear surface of the opening 127a, the thickness of the light source 129a is limited by the thickness of the opening 127a. As a result, You can delete the space that you want.

1, a portion of the housing 130 coupled with the support main 130 and the top cover 140 on the back surface of the printed circuit board 129b is removed, and the space formed by the light source housing 127 is removed can do.

As a result, the first embodiment of the present invention can reduce the width of the bezel b of the top cover.

The term "bezel (b)" refers to a frame, a chassis, and the like used for supporting and / or housing various panels such as a liquid crystal display panel and a plasma display panel.

In this bezel (b) for a liquid crystal display panel, a metal plate of a predetermined size is usually pressed to remove a central portion to form a rectangular flat frame, and the edges of the flat frame are bent to form four side portions ≪ / RTI >

The bezel (b) defines an area where the screen can be displayed on the front surface of the panel, meaning that the narrower the width of the bezel (b) in the panel having the same area, the more the screen display area can be enlarged. Therefore, minimizing the width of the bezel (b) is one of the important factors for enhancing the competitiveness of the product.

Here, the first embodiment of the present invention means that the bezel b can be narrowed by changing the structure of another component without narrowing the optical distance defined in the prior art of Fig.

The optical distance is the distance between the light incident surface of the light guide plate 123 and the active area. The reason why the optical distance is required is that if the light from the light source 129a leaks directly to the upper side without passing through the light guide plate 123, it may become difficult to achieve normalization of the screen brightness, A hot spot phenomenon in which light is concentrated in only a part of the region may occur.

Therefore, the first embodiment of the present invention has an advantage that a wide image can be realized without decreasing the screen quality by keeping the optical distance as it is in the prior art and narrowing the width of the bezel (b).

In addition, the first embodiment of the present invention can increase the luminous efficiency of the light source 129a by narrowing the interval d between the light source 129a and the light-incident surface. As a result, the amount of light to be scanned on the liquid crystal panel is increased, so that the brightness of the liquid crystal display device can be improved.

The light source housing 127 includes a thermal diffusing portion 127b at a portion contacting the lower surface of the opening 127a. 3B, the thermal diffusion unit 127b has a rectangular shape covering both the light guide plate 123 and the lower surface of the reflection sheet.

At this time, light is emitted from the light source 129a, and heat is generated, and the heat is transmitted to the opening 127a contacting the front surface of the printed circuit board 129b via the printed circuit board 129b. The opening 127a transmits the heat to the thermal diffusion unit 127b, and the heat is diffused only in one direction from the lower surface of the light guide plate 123. [ That is, heat is diffused only in the direction from the printed circuit board 129b to the opposite side of the printed circuit board 129b as a whole.

In the prior art of FIG. 1, the light source housing 127 is formed on the back surface of the printed circuit board 129b, and the heat diffusion direction is not constant. In this case, the heat does not spread smoothly, and if there is an edge or the like in the path of heat transfer, it may cause thermal problems such as abrasion.

Therefore, the first embodiment of the present invention provides a more excellent heat radiation effect.

Next, a second embodiment of the present invention will be described with reference to the drawings.

4A is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.

The second embodiment of the present invention also includes a liquid crystal panel 210, a top cover 240, a support main body 230, and a backlight unit 220 as in the first embodiment.

The liquid crystal panel 210 includes opposing thin film transistor substrates 212 and a color filter substrate 214, a liquid crystal layer (not shown) between the two substrates, and polarizers 219a and 219b on the outer surfaces of the two substrates.

The backlight unit 220 includes a light source assembly 229, a light source housing 227, a light guide plate 223 facing the light source assembly 229 on one side, a reflective sheet 225 on the bottom surface of the light guide plate 223, And an optical sheet 221.

At this time, the light source housing 227 serves as a bottom cover and can be coupled to the top cover 240.

The light source assembly 229 is formed of a light source 229a and a printed circuit board 229b and a light source housing 227 is disposed on the entire surface of the printed circuit board 229b. The unexplained portion is the fixing member 265 of the liquid crystal panel 210. [

The second embodiment of the present invention is different from the first embodiment in that a light source protecting member 222 is separately formed in the opening 227a of the light source housing 227. [

The thickness of the opening 227a of the light source housing 227 is smaller than the thickness of the light source 229a of the light source 229a. The light source protecting member 222 is formed closer to the light incident surface of the light guide plate 223 than the light source 229a. It may be the same or smaller than the thickness. In the figure, the thickness of the opening 227a is shown to be smaller than the thickness of the light source 229a.

FIG. 4B is a partial perspective view illustrating a light source housing and a light source assembly according to a second embodiment of the present invention.

Unlike the first embodiment of the present invention, the opening 227a of the housing does not form a partition wall between the light sources 229a. At this time, a light source protecting member 222 is protruded from the partition wall of the opening 227a of the light source housing 227. [

The light source protecting member 222 may be integrally formed with the light source housing 227, but may be inserted into or attached to the light source housing 227.

4C is an exploded perspective view of a light source housing and a light source protecting member according to a second embodiment of the present invention.

When the light source protecting member 222 is inserted, it may be formed in various forms such as bolts, rivets, and screws. In the case where the light source protecting member 222 is attached, a metal having a constant thickness may be attached by an adhesive material such as a double- . In the drawings, screws are shown in the form of an insert.

The insertion portion 222b of the light source protecting member 222 is inserted into the hole 227c formed in the opening 227a of the light source housing 227. [ At this time, the hole 227c and the insertion portion 222b are formed with helical grooves corresponding to each other. After the insertion is completed, only the protrusion 222a is left outside the light source housing and protrudes toward the light guide plate 223. [

The shape and position of the light source protecting member 222 are not limited to the second embodiment of the present invention, and any shape can be used as long as it can prevent contact between the light guide plate and the light source.

In the second embodiment of the present invention, since the barrier ribs between the light sources are eliminated, the amount of light incident on the light-entering surface can be further increased as compared with the first embodiment, thereby further improving the light-incident efficiency.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Therefore, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also within the scope of the present invention.

Light guide plate: 123,223 Light source housing: 127. 227
Openings 127a and 227a Thermal diffusion units 127b and 227b
Light source assembly: 129, 229 Light source: 129a, 229a
Printed circuit boards: 129b and 229b: liquid crystal panels: 110 and 210
Top cover: 130, 230 Bezel: b

Claims (9)

A liquid crystal panel for displaying an image on the front surface;
A light guide plate for emitting light from a rear surface of the liquid crystal panel;
A light source disposed on at least one side of the light guide plate;
A printed circuit board for mounting the light source;
A light source housing attached to a front surface of the printed circuit board; And
And a top cover surrounding a top edge of the liquid crystal panel,
The light source housing covers the back surface of the light guide plate and is coupled with the top cover;
Wherein the light source housing includes an opening having an opening area corresponding to the light source on the printed circuit board, and a thermal diffuser corresponding to the light guide plate;
The opening is formed to be thicker than the light source so that the light source does not contact the light guide plate;
Wherein the printed circuit board is disposed on an outer surface of the light source housing, and the light source is disposed in an opening area of the opening constituting the light source housing. The method according to claim 1,
Wherein the light source is a plurality of LEDs spaced apart from each other, and the opening of the light source housing is formed thicker than the plurality of LEDs in the space of the plurality of LEDs. The method according to claim 1,
Wherein the thermal diffusion portion of the light source housing is formed to extend from a lower portion of the opening portion toward a back surface of the light guide plate. delete delete The method according to claim 1,
Wherein a rear surface of the printed circuit board is in close contact with an inner surface of the top cover. A liquid crystal panel for displaying an image on the front surface;
A light guide plate for emitting light from a rear surface of the liquid crystal panel;
A light source disposed on at least one side of the light guide plate;
A printed circuit board for mounting the light source;
A light source housing attached to a front surface of the printed circuit board; And
And a top cover surrounding a top edge of the liquid crystal panel,
The light source housing covers the back surface of the light guide plate and is coupled with the top cover;
The light source housing includes an opening having an opening corresponding to the light source, a thermal diffusion unit corresponding to the light guide plate, and a light source protecting member protruding toward the light guide plate so that the light source does not contact the light guide plate in the light source housing and;
Wherein the printed circuit board is disposed on an outer surface of the light source housing, and the light source is disposed in an opening area of the opening of the light source housing. delete 8. The method of claim 7,
Wherein a thickness of the opening portion of the light source housing is equal to or smaller than a thickness of the light source.

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