KR101915748B1 - Liquid Crystal Display Device - Google Patents

Abstract

A liquid crystal display device according to an embodiment of the present invention has an object to improve the fixation force and to efficiently discharge heat of the LED by fixing the LED assembly through the long hole of the LED housing and the fixing member of the LED assembly. The liquid crystal display device includes a liquid crystal panel for displaying an image on a front surface thereof; A guide panel for fixing and supporting the liquid crystal panel at a lower portion of the rim of the liquid crystal panel; A plurality of optical sheets arranged on a back surface of the liquid crystal panel; A light guide plate disposed on a back surface of the plurality of optical sheets; A reflective sheet disposed on a back surface of the light guide plate; A plurality of LEDs disposed on at least one side of the light guide plate; A printed circuit board mounted on the front surface of the plurality of LEDs; A plurality of fixing members fixedly projected to the rear surface of the printed circuit board; An LED housing fixing the printed circuit board through a plurality of elongated holes formed by insertion holes into which the fixing members are inserted and slide holes into which the fixing members are inserted and slide; And a cover bottom for housing the LED housing, the reflection sheet, the light guide plate, and the plurality of optical sheets.

Description

[0001] The present invention relates to a liquid crystal display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device for reducing heat generated from a light source to improve durability of a light source.

 2. Description of the Related Art Generally, a liquid crystal display (LCD) is a type of flat panel display that displays images using the electrical and optical characteristics of a liquid crystal having characteristics intermediate between a liquid and a solid. Thin and light, low power consumption and driving voltage are used in various applications throughout the industry.

On the other hand, the liquid crystal display device requires a separate light source because it is a non-luminescent element that emits light due to external factors.

Accordingly, a backlight unit having a light source on the back surface of the liquid crystal panel is provided to irradiate light toward the front surface of the liquid crystal display, and the light is diffused through a plurality of optical sheets (optical sheets) And is realized as an image that can be recognized only when it is condensed.

Hereinafter, a structure of a conventional liquid crystal display device will be described in detail.

1 is a cross-sectional view of a conventional liquid crystal display device.

The liquid crystal display device is roughly divided into a liquid crystal panel 10, a backlight unit (not shown), and a driving circuit unit (not shown). At this time, the liquid crystal panel 10 and the backlight unit are fixed and protected by the guide panel 30 and stored in the upper surface of the cover bottom 40.

The liquid crystal panel 10 is composed of a thin film transistor substrate 11 and a color filter substrate 13. The thin film transistor substrate 11 includes a thin film transistor (not shown) connected to a pixel electrode (not shown) for each pixel, wherein the thin film transistor switches a voltage applied to a liquid crystal layer (not shown) And the color filter substrate 13 filters the light emitted from the liquid crystal layer (not shown) with a few colors to realize various colors by combining the several colors.

On the other hand, an upper polarizer 15a and a lower polarizer 15b are disposed on the upper surface of the color filter substrate 13 and the lower surface of the TFT substrate 11, respectively. Polarized light to realize a uniform image.

The backlight unit is disposed on the lower surface of the liquid crystal panel 10 and includes an LED assembly 21, an LED housing 22, a light guide plate 24, a reflective sheet 23, and a plurality of optical sheets 25 .

The LED assembly 21 is composed of an LED 21a and a printed circuit board (PCB) 21b. The LED 21a is mounted on a single chip or a plurality of chips to emit blue, green, . The printed circuit board 21b includes wiring for driving the LED 21a, and the LED 21a is mounted on the front surface.

The light emitted from the LED 21a goes toward one side of the light guide plate 24, that is, the light entrance surface. The emitted light passes through the light guide plate 24 in the upper and lower directions of the light guide plate 24 through total reflection, diffusive reflection, diffusion, and the like.

The planar light source facing downward is reflected by the reflective sheet 23 and directed upward, and the planar light source facing upward is diffused and condensed through the plurality of optical sheets 25 and is directed toward the liquid crystal panel 10.

At this time, since the LED 21a is a light emitting element, a lot of heat is generated in the LED 21a. Accordingly, the LED housing 22 is arranged to emit such heat to the outside.

The LED housing 22 may be formed of a metal having good thermal conductivity for discharging heat to the outside, and the LED assembly 21 may be mounted on one surface. At this time, the LED assembly 21 is mounted by attaching a heat conductive tape T to the one surface.

2 is an exploded perspective view showing an assembly structure of the LED housing, the heat conduction tape, and the LED assembly.

The LED housing 22 is composed of a vertical portion 22a perpendicular to the cover bottom 40 and a horizontal portion 22b horizontal to the cover bottom 40. [ At this time, the thermally conductive tape T may be attached to the front surface of the vertical portion 22a. The LED assembly 21 may also be attached to the front surface of the vertical portion 22a of the LED housing 22 to which the thermally conductive tape T is attached.

The heat conductive tape T is formed to have a size similar to the rear surface of the LED assembly 21 so that the LED assembly 21 is not detached and has a thermal conductivity of about 0.5 to 0.6 W / To the LED housing 22, as shown in FIG.

However, the thermal conductivity of the thermally conductive tape T is such that the heat generated by the LED assembly 21 can not be efficiently conducted because the thermal conductivity is significantly lower than that of the metal. Therefore, the heat generated from the LED assembly 21 may not be properly discharged, thereby reducing the lifetime of the LED 21a.

In addition, since the thermally conductive tape T is attached by hand, there is a high probability of erroneous adhesion. At this time, when an air gap is formed between the LED assembly 21 and the LED housing 22 due to misapplication, the thermal resistance further increases, and the lifetime of the LED 21a may be further reduced.

In addition, the adhesive force may be weakened over time, and many points have been pointed out with respect to the attachment of the LED assembly 21 and the heat conductive tape T of the LED housing 22.

Therefore, in order to solve the above-described problems, the embodiments of the present invention provide a heat dissipating effect of the LED assembly by removing the heat conductive tape and fixing the LED housing and the LED assembly through the long holes of the LED housing and the fixing member of the printed circuit board. There is a purpose in improvement.

Other objects and features of the present invention will be described in the following detailed description and claims.

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 guide panel for fixing and supporting the liquid crystal panel at a lower portion of the rim of the liquid crystal panel; A plurality of optical sheets arranged on a back surface of the liquid crystal panel; A light guide plate disposed on a back surface of the plurality of optical sheets; A reflective sheet disposed on a back surface of the light guide plate; A plurality of LEDs disposed on at least one side of the light guide plate; A printed circuit board mounted on the front surface of the plurality of LEDs; A plurality of fixing members fixedly projected to the rear surface of the printed circuit board; An LED housing fixing the printed circuit board through a plurality of elongated holes formed by insertion holes into which the fixing members are inserted and slide holes into which the fixing members are inserted and slide; And a cover bottom housing the LED housing, the reflective sheet, and the light guide plate, and the plurality of optical sheets; And a control unit.

Preferably, the plurality of fixing members are formed of a body fixed to the printed circuit board and a head having a larger diameter than the body.

In addition, the insertion hole of the long hole is composed of a first opening area into which the head is inserted and a second opening area into which the body is inserted, and the long slide hole is formed in a first Wherein a width of the first and second opening regions and a width of the first slide region are larger than a diameter of the head and a width of the second slide region is larger than a width of the second slide region, Is smaller than the diameter of the head and larger than the diameter of the body.

Further, the heads of the plurality of fixing members are inserted into the first opening region and then slide in the first slide region, but the second slide region is not detached from the LED housing as a latching jaw .

In addition, a taper is formed or a step is formed such that a width of the first slide region is wider than a width of the second slide region.

Further, the plurality of fixing members may further include a nut for inserting and fixing the body portion in the printed circuit board.

In addition, the printed circuit board may include a wiring layer for driving the LED and a heat radiating layer on the lower surface of the wiring layer, and a space for inserting the nut between the wiring layer and the heat radiating layer, And a through hole to be inserted into the nut.

In addition, the plurality of fixing members may have a spiral groove formed in one area of the body, and the printed circuit board may have a spiral groove formed on the inner surface of the hole into which the body is inserted, thereby screwing the fixing member.

The plurality of fixing members may be rivets, screws, or pins.

The liquid crystal display device according to at least one embodiment of the present invention configured as described above,

The heat radiation effect can be improved by removing the thermally conductive tape having a low thermal conductivity and fixing the LED housing and the LED assembly by contacting the fixing member of the printed circuit board and the LED housing through the slot of the LED housing. Accordingly, the temperature of the LED can be lowered by the heat dissipation effect, and the lifetime of the LED can be increased.

In addition, the durability of the product can be improved by improving the weakening of the fixation force over time which is a problem in using the heat conduction tape.

It also improves process accuracy and improves productivity by simplifying assembly of LED housings and LED assemblies.

1 is a cross-sectional view of a conventional liquid crystal display device.
2 is an exploded perspective view showing an assembly structure of the LED housing, the heat conduction tape, and the LED assembly.
3 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.
4A to 4C are assembly views illustrating an assembly process of the LED housing and the LED assembly according to an embodiment of the present invention.
5A is a front view of an LED housing according to an embodiment of the present invention.
5B is a cross-sectional view taken along a line I-I 'in FIG. 4B.
5C is a cross-sectional view taken along the line II-II 'in FIG. 4C, showing a case where a section of the slide hole has a taper.
FIG. 5D is a sectional view of the slide holes II-II 'in FIG.
Fig. 5E is a sectional view of II-II 'of Fig. 4C showing a case where the cross-section of the slide hole has a concavo-convex shape.
6 is a rear perspective view of an LED assembly according to an embodiment of the invention.
7A is a rivet and a nut according to an embodiment of the present invention.
7B through 7E are assembly flowcharts of rivets and nuts and LED assemblies according to an embodiment of the present invention.
8A is a screw according to an embodiment of the present invention.
8B is an assembled cross-sectional view of a screw and an LED assembly according to an embodiment of the present invention.
9 is a comparison table of the prior art and the embodiment of the present invention for the temperature of the LED assembly and the LED housing.

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

In the present specification, the same reference numerals are given to the same components in different embodiments, and the description thereof is replaced with the first explanation.

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

In addition, it should be considered that the constituent elements of the drawings attached hereto can be enlarged or reduced for convenience of explanation.

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

3, a liquid crystal display 100 according to an exemplary embodiment of the present invention includes a liquid crystal panel 110 for displaying an image, a liquid crystal panel 110 connected to one side of the liquid crystal panel 110, And a backlight unit 120 disposed on the back surface of the liquid crystal panel 110 to irradiate the liquid crystal panel 110 with light.

At this time, the edge of the liquid crystal panel 110 is supported and fixed by the guide panel 130. The guide panel 130 and the backlight unit 120 are accommodated in a cover bottom 140 covering a lower surface of the liquid crystal panel 110.

The liquid crystal panel 110 is a part that plays a key role in image display and includes a thin film transistor (TFT) substrate 111 and a color filter substrate 111, which are bonded to each other with a liquid crystal layer (not shown) (113).

At this time, a polarizing plate (not shown) for selectively transmitting only specific light may be attached to the upper and lower outer surfaces of the two substrates, respectively.

The liquid crystal panel 110 is connected to a 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, (117) is brought into close contact with the side surface of the guide panel (130) or the back surface of the cover bottom (140) appropriately during the modularization process. Alternatively, the circuit board 117 may be embedded in the upper side of the liquid crystal panel 110 in the form of a chip on glass (COG).

When a thin film transistor (not shown) selected for each gate line (not shown) is turned on by an on / off signal of a gate driving circuit (not shown) transferred to the liquid crystal panel 110, the data driving circuit (Not shown) is transmitted to the corresponding pixel electrode (not shown) through a data line (not shown), and the arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode Shows the difference in transmittance. At this time, light incident through the color filter substrate 113 may be filtered in a plurality of hues to display an image.

The backlight unit 120 is disposed on the rear surface of the liquid crystal panel 110. The backlight unit 120 includes an optical sheet 125 formed on the back surface of the liquid crystal panel 110 to diffuse and condense light, A reflective sheet 123 provided on the back surface of the light guide plate 124 and an LED assembly 121 provided along at least one side of the light guide plate 124 to emit light, an LED assembly 121 (Not shown).

The optical sheet 125 disposed in parallel to the back surface of the liquid crystal panel 110 includes a diffusion sheet 125a, a prism sheet 125b, and a protective sheet 125c which are sequentially stacked. The diffusion sheet 125a diffuses the light from the LED assembly 121 and supplies the light to the liquid crystal panel 110. The prism sheet 125b allows the light passing through the diffusion sheet 125a to proceed vertically to improve the brightness and the protective sheet 125c has a diffusion sheet 125a and a prism sheet 125b sensitive to dust and scratches Protect.

A light guide plate 124 is disposed under the optical sheet 125. The light guide plate 124 converts the point light source introduced from the LED assembly 121 into a surface light source through total reflection, diffusive reflection, diffusion, and the like. The planar light source may be emitted to upper and lower portions of the light guide plate 124.

The light guide plate 124 may be formed of any one of PMMA (polymethyl methacrylate), PET (polyethylene terephthlate), PC (poly carbonate), and PEN (polyethylene naphthalate).

A reflective sheet 123 is disposed under the light guide plate 124. The reflective sheet 123 reflects the light emitted downward from the light guide plate 124 to the upper portion, thereby reducing light loss. The reflective sheet 123 may be formed of a material such as PET (polyethylene terephthalate) or PC (poly carbonate).

The LED assembly 121 may be disposed on at least one side of the light guide plate 124. The LED assembly 121 includes an LED 121A and a printed circuit board 121b.

The LED 121a emits light. The LED 121a mounts a small chip emitting light of monochromatic colors such as blue, red, and green. Accordingly, the LED 121a may emit monochromatic light or may emit white light by combining LEDs 121a including blue, green, and red wavelengths by arranging a plurality of LEDs 121a emitting the same wavelength .

At this time, the LED 121a may be in the form of an LED 121a package in which a small chip is embedded in a mold frame. The plurality of LEDs 121a may be spaced apart from each other by a predetermined distance.

The printed circuit board 121b applies an electrical signal to the LED 121a and mounts the LED 121a on the front surface of the printed circuit board 121b. At this time, the printed circuit board 121b has a wiring layer (not shown) for driving the LED 121a on its front surface and aluminum (Al) having a good heat transfer rate for discharging the heat emitted from the LED 121a to the outside, An insulation layer (not shown) formed between the heat dissipation layer (not shown) and the wiring layer (not shown) to prevent a short circuit between the heat dissipation layer (not shown) made of the main material and the heat dissipation layer (Not shown).

The LED housing 122 may mount the LED assembly 121 on a rear surface of the LED assembly 121. The LED housing 122 is mounted on the light guide plate 124 so as to face the side face of the light guide plate 124 to prevent light loss and is formed of a metal having a high conductivity to discharge the heat of the LED assembly 121 to the outside It plays a role.

The LED housing 122 may include a vertical portion 122a perpendicular to the cover bottom and a horizontal portion 122b horizontal to the cover bottom and the LED assembly 121 may be disposed on the front surface of the vertical portion 122a. And the horizontal portion 122b may extend in the direction of the light guide plate 124 to emit heat that is transmitted from the LED assembly 121 by the vertical portion 122a. However, the horizontal portion 122b is not necessarily required, and various structures may be adopted for heat dissipation.

The LED housing 122 may include a plurality of elongated holes S for mounting the LED assembly 121. The elongated holes S may be formed on one side of the vertical portion 122a . The long hole S is composed of an insertion hole S1 and a slide hole S2. Although only five slots S are shown in the figure, the present invention is not limited thereto and various numbers may be formed.

A plurality of fixing members R are mounted on the rear surface of the printed circuit board 121b so as to be inserted into the long holes S to fix the LED assembly 121 to the LED housing 122 .

The plurality of fixing members R may be mounted on the printed circuit board 121b at positions corresponding to the elongated holes S and inserted into the insertion holes S1 of the elongated holes S, The LED assembly 121 can be fixed to the LED housing 122 by sliding the LED assembly 121 through the slide groove S2.

A cover bottom 140 for receiving the backlight unit 120 may be disposed at a lower portion. In the case where the LED housing 122 is not mounted, the fixing member R is inserted into one side of the cover bottom 140 to fix the LED assembly 121 to the cover bottom 140 A long hole S may be formed.

Here, the fastening and fixing method of the long hole S will be described in more detail with reference to the other drawings.

4A to 4C are assembly views illustrating an assembly process of the LED housing and the LED assembly according to an embodiment of the present invention. FIG. 5A is a front view of the LED housing according to an embodiment of the present invention, FIG. 5B is a sectional view taken along a line I-I 'in FIG. 4B and FIG. 5C is a sectional view taken along a line II- Fig. 5D is a sectional view taken along the line II-II 'in Fig. 4C, and Fig. 5D is a sectional view of the slide hole when the section of the slide hole has a concavo- Fig.

4A, the LED assembly 121 is prepared to be mounted toward the vertical portion 122a of the LED housing 122. As shown in FIG. In the figure, the arrow indicates the direction in which the LED assembly 121 is mounted.

A fixing member R is fixed to the rear surface of the LED assembly 121 and the fixing member R protrudes from the rear surface of the printed circuit board 121b. The fixing member R is composed of a body R2 fixed to the rear surface of the printed circuit board 121b and a head R1 connected to the body R2. The head R1 is formed to have a longer diameter than the body R2.

The long hole S of the LED housing 122 includes an insertion hole S1 into which the fixing member R is inserted and a slide hole S2 through which the fixing member R slides. At this time, the inner region of the long hole S may be defined by dividing the region where the head R1 moves and the region where the body R2 moves when the fixing member R is inserted and moved.

That is, one region of the insertion hole S1 into which the head R1 is inserted is the first opening region S110 and one region of the slide hole S2 through which the head R1 moves is the first slide region S210 One region of the insertion hole S1 into which the body R2 is inserted is the second opening region S120 and one region of the slide hole S2 through which the body R2 moves is the second opening region S120, Is defined as a slide area S220.

Referring to FIG. 4B, the LED assembly 121 is disposed to contact the LED housing 122 as the fixing member R is inserted into the insertion hole S1. The LED assembly 121 and the vertical part 122a of the LED housing 122 are arranged to be offset from each other. At this time, the width of the insertion hole S1 will be described with reference to FIG. 5B.

It is preferable that the head R1 is completely inserted into the insertion hole S1 in order for the LED assembly 121 to be in close contact with the entire surface of the vertical portion 122a of the LED housing 122. [ 5B, the widths of the first opening region S110 and the second opening region S120 of the insertion hole S1 are greater than the diameter of the head R1 and the first width w1 . Therefore, the body R2 may also be inserted into the second opening region S120.

Next, referring to FIG. 4C, the LED assembly 121 slides in the arrow direction through the slide hole S2. The slide movement direction may be variously changed according to the arrangement of the slide hole S2 and the insertion hole S1 of the long hole S. [

When the fixing member R contacts the end face of the slide hole S2 after the slide is moved, both side edges of the LED housing 122 and the LED assembly 121 are aligned so that the LED housing 122 and the LED housing 122 are aligned with each other. Assembly of the LED assembly 121 is completed.

Referring to FIG. 5C, the inner surface 122c of the slide hole S2 has a predetermined degree of taper. Specifically, the slide hole S2 has a second width w2, a third width w3, and a fourth width w4, and the length from the second width w2 to the fourth width w4 becomes longer Lt; / RTI > At this time, the third width w3 is equal to the diameter of the head R1, and the fourth width w4 is equal to the diameter of the body R2.

At this time, the width of the first slide region S210 is equal to or greater than the third width w3 and equal to or smaller than the second width w2, and the width of the second slide region S220 is equal to or smaller than the third width w3 and is equal to or greater than the fourth width w4.

Therefore, the head R1 moves in the first slide region S210 within the slide hole S2 while the second slide region S220 acts as a latching jaw of the head R1, S220) direction. As a result, the LED assembly 121 can slide and be fixed to the LED housing 122.

Meanwhile, another embodiment of the slide hole will be discussed with reference to FIGS. 5D and 5E.

Referring to FIG. 5D, the inner surface 122d of the slide hole S2 is formed with a predetermined step. Specifically, the slide hole S2 has a fifth width w5 and a sixth width w6, and the fifth width w5 is larger than the sixth width w6. The fifth width w5 is equal to or greater than the diameter of the head R1 and the sixth width w6 is equal to or greater than the diameter of the body R2 but smaller than the fifth width w5.

The width of the first slide region S210 is equal to the fifth width w5 and the width of the second slide region S220 is equal to the sixth width w6.

Therefore, the second slide region S220 serves as a latching jaw of the head R1, so that the fixing member R is not separated from the LED housing 122 when the slide is moved.

Referring to FIG. 5E, the inner surface 122e of the slide hole S2 is formed in a concave shape. Specifically, the slide hole S2 has a seventh width w7 and an eighth width w8, and the seventh width w7 is greater than the eighth width w8. The seventh width w7 is equal to or greater than the diameter of the head R1 and the eighth width w8 is equal to or greater than the diameter of the body R2 but smaller than the seventh width w7.

The width of the first slide region S210 is equal to the seventh width w7 and the width of the second slide region S220 is equal to the eighth width w8. A third slide region may be defined, and the third slide region may be equal to the width of the second slide region S220.

The concave-convex slide hole S2 can more securely fix the movement of the head R1 than in the case of the slide hole S2 having a step. Therefore, the LED assembly 121 can be fixed more securely.

The LED housing 122 and the LED assembly 121 are connected to each other through the elongated hole S of the fixing member R and the LED housing 122, So that the heat of the LED assembly 121 can be transmitted to the LED housing 122 more easily. As a result, the temperature of the LED 121a may be lower than that of the conventional case, thereby increasing the lifetime of the LED 121a.

In the trend of slimming down the liquid crystal display device as the day progresses, the slimming of the product is inevitably directly linked to the reduction in the thickness and the number of the light guide plate and the optical sheet. I can not help it. However, the increase in the amount of light requires an increase in the amount of current that drives the light source, and as a result, a lot of heat is generated in the light source, so that the life of the light source can be reduced. One embodiment of the present invention is meaningful in that the life of the light source can be increased by lowering the temperature of the light source according to the current trend.

Also, since the LED housing 122 and the LED assembly 121 are separated from each other even after a lapse of time from assembly, it is possible to improve the durability of the product by improving the fixation force with time, which is a problem in using the heat conductive tape.

In addition, it is possible to improve the accuracy of the process and to simplify the assembly of the LED housing 122 and the LED assembly 121, thereby improving the productivity.

Hereinafter, in one embodiment of the present invention, the shape of the fixing member will be described in more detail.

FIG. 6 is a rear perspective view of an LED assembly according to an embodiment of the present invention, wherein FIG. 7A is a rivet and a nut according to an embodiment of the present invention, and FIGS. 7B to 7E are cross- It is the assembling flowchart of the nut and the LED assembly. FIG. 8A is a screw according to an embodiment of the present invention, and FIG. 8B is an assembled cross-sectional view of a screw and an LED assembly according to an embodiment of the present invention.

Referring to FIG. 6, the fixing member R according to one embodiment of the present invention is fixed to the rear surface of the printed circuit board 121b, and may have a protruding shape. Each fixing member R is composed of a body R2 and a head R1 and the body R2 and the head R1 may be formed in a cylindrical shape. Although only five fixing members R are shown in the drawing, the present invention is not limited thereto and a plurality of fixing members R may be disposed.

Hereinafter, a specific configuration of the fixing member R will be described.

Referring to FIG. 7A, the fixing member R according to an embodiment of the present invention may be a rivet (RV) and a nut (NT). The rivet RV is composed of a body R2 and a head R1 and the diameter of the body R2 is shorter than the diameter of the head R1. The body R2 may be inserted and fixed to the nut NT. The cross section of the rivet (RV) and the nut (NT) may be circular or various polygons.

Hereinafter, a process of assembling the rivet (RV) and the nut (NT) on the printed circuit board 121b will be described with reference to FIGS. 7B to 7E.

The printed circuit board 121b is formed of a heat dissipation layer 211, an insulation layer 212, and a wiring layer 213.

7B shows the heat dissipation layer 211. The heat dissipation layer 211 is made of a conductive material such as aluminum or the like and has a through hole 211a formed in one region thereof and has a through hole 211a, A groove 211b having a diameter wider than the diameter of the through hole 211a is formed at one end of the through hole 211a. At this time, the heat dissipation layer 211 may be formed by a method such as injection molding, extrusion molding, or the like, but may be formed by punching a completed structure such as endmilling.

7C, the body R2 of the rivet RV is inserted into the through hole 211a in the first direction. At this time, an end of the body R2 may be disposed in a region of the groove 211b of the heat dissipation layer 211.

7D, the nut NT is inserted into the end of the body R2 in a second direction opposite to the first direction. At this time, the nut NT fixes the rivet RV, and the thickness of the nut NT may be the same as the thickness of the groove 211b.

Finally, in FIG. 7E, the insulating layer 212, the wiring layer 213, and the LED 121a are sequentially formed on the heat dissipation layer 211. The wiring layer 213 is a layer including wiring for driving the LED 121a and the insulating layer 212 is formed of a metal such as a heat dissipation layer 211 and a wiring layer 213. When the LED 121a is driven, (short).

Hereinafter, the case where the fixing member R is a screw SC will be described in detail through FIG. 8A.

The screw SC is composed of a body R2 and a head R1 and the head R1 is longer in diameter than the body R2. On the other hand, a first helical groove R4 is formed on a lower surface of the body R2. The first helical groove R4 may be formed on the entire surface of the body R2 but only the region where the screw SC is inserted into the printed circuit board 121b may be formed.

Referring to FIG. 8B, the assembly of the LED 121a and the screw SC includes a heat dissipation layer 211, an insulation layer 212, and a wiring layer 213 , And a through hole (211a) is formed in one region of the heat dissipation layer (211). The through hole 211a is formed with a second helical groove 211c whose inner surface corresponds to the first helical groove R4 of the screw SC.

The screw SC is screwed to the LED 121a assembly in the direction of the arrow in the figure while one side of the through hole 211a is clogged with an insulating layer 212, 121b are limited in depth.

Or the portion of the body R2 of the screw SC where the first helical groove R4 is not formed is longer than the portion where the first helical groove R4 is formed. In this case, the diameter of the through hole 211a is substantially equal to the diameter of the portion where the first helical groove R4 is formed. Therefore, the portion where the first helical groove R4 is not formed passes through the through hole 211a, It can not be inserted inside. Therefore, the depth at which the screw SC is inserted into the printed circuit board 121b is limited to the portion where the first helical groove R4 is formed. At this time, since the insulating layer 212 is not damaged by the contact with the insulating layer 212, stable fixing can be achieved.

The fixing member R according to the embodiment of the present invention has been described above. However, the fixing member R according to one embodiment of the present invention is not limited to the one described in the present specification, and may be a fixing member R, such as a pin or a hook structure inserted by caulking, The present invention includes all the fixing members R that can be changed by those skilled in the art.

Hereinafter, the heat radiation effect of an embodiment of the present invention will be examined with reference to FIG.

9 is a comparison table of the prior art and the embodiment of the present invention for the temperature of the LED assembly and the LED housing.

The abscissa is the temperature and the ordinate is the position on the LED assembly and the LED housing. At this time, 1p to 12p refer to measurement points, which is shown in Fig. 5a.

Looking at the above figures, one embodiment of the present invention was measured at lower temperatures at all measurement points than the prior art. However, although the deviation is small in 1p and 12p, the deviation is small because 1p and 12p are the edge regions.

Here, the average temperature of the prior art is 101.85 占 폚, and the average temperature in the embodiment of the present invention is 94.07 占 폚, so 9.43 占 폚 is lowered and the temperature can be reduced by about 9.1%.

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.

110: liquid crystal panel 120: backlight unit
121: LED assembly 121a: LED
121b: printed circuit board 122: LED housing
130: guide panel 140: cover bottom
S: Slot S1: Insertion hole
S2: Slide hole S110: First opening area
S120: second opening area S210: first slide area
S220: second slide region R: fixed member
R1: Head R2: Body

Claims (11)

A liquid crystal panel for displaying an image on the front surface;
A guide panel for fixing and supporting the liquid crystal panel at a lower portion of the rim of the liquid crystal panel;
A plurality of optical sheets arranged on a back surface of the liquid crystal panel;
A light guide plate disposed on a back surface of the plurality of optical sheets;
A reflective sheet disposed on a back surface of the light guide plate;
A plurality of LEDs disposed on at least one side of the light guide plate;
A printed circuit board mounted on the front surface of the plurality of LEDs;
A plurality of fixing members fixedly projected to the rear surface of the printed circuit board;
An LED housing fixing the printed circuit board through a plurality of elongated holes formed by insertion holes into which the fixing members are inserted and slide holes into which the fixing members are inserted and slide; And
A reflective sheet and a light guide plate, and a cover bottom for accommodating a plurality of optical sheets,
Wherein the plurality of fixing members are formed of a body fixed to the printed circuit board and a head having a larger diameter than the body,
The insertion hole of the long hole is composed of a first opening area into which the head is inserted and a second opening area into which the body is inserted, and the long slide hole is formed in the first slide area And a second slide region on which the body slides,
Wherein the width of the first and second opening regions and the width of the first slide region are larger than the diameter of the head and the width of the second slide region is smaller than the diameter of the head and larger than the diameter of the body. Display device.
delete delete The method according to claim 1,
Characterized in that the heads of the plurality of fixing members slide in the first slide region after being inserted into the first opening region and the second slide region is not detached from the LED housing as a latching jaw Device. The method according to claim 1,
Wherein a taper is formed or a step is formed such that the width of the first slide region is wider than the width of the second slide region. The method according to claim 1,
Wherein the plurality of fixing members further include a nut for inserting and fixing the body inside the printed circuit board. The method according to claim 6,
Wherein the printed circuit board comprises a wiring layer for driving the LED and a heat radiating layer on the lower surface of the wiring layer, and a space for inserting the nut between the wiring layer and the heat radiating layer, and a body for fixing the fixing member to the heat radiating layer And a through hole for insertion. The method according to claim 1,
Wherein the plurality of fixing members are formed with spiral grooves in one region of the body, and the printed circuit board has a spiral groove formed on the inner surface of the hole into which the body is inserted, thereby screwing the fixing member. The method according to claim 1,
Wherein the plurality of fixing members are rivets, screws, or pins.
delete delete

Images