KR101762347B1 - Fixing member and liquid crystal display device having the same - Google Patents

Abstract

The present invention relates to a fixing member and a liquid crystal display including the same.
According to the present invention, in a liquid crystal display device in which a LED assembly, a light guide plate, a diffusion plate, a backlight unit including a plurality of optical sheets, and a liquid crystal panel are modularized through a cover bottom, a support main and a top cover, The fixing member for fixing the light guide plate includes a head portion that is seated on the light guide plate, first and second leg portions that are formed at the other end of the opposite side integrally joined to the head portion, And a body portion including a hook portion projecting from the end.

Description

TECHNICAL FIELD [0001] The present invention relates to a fixing member and a liquid crystal display device including the fixing member.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fixing member and a liquid crystal display including the same, and more particularly to a liquid crystal display capable of fixing a light guide plate efficiently.

A liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used in TVs and monitors, exhibits optical anisotropy and polarization properties of a liquid crystal, And the like.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

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 of the liquid crystal panel.

The backlight unit includes a light source and is divided into a direct type and an edge type according to the position of a light source. The direct-type backlight unit emits light from a light source by arranging a light source under the liquid crystal panel The backlight unit of the side-type type has a structure in which a light guide plate is disposed under the liquid crystal panel and a light source is disposed on at least one side surface of the light guide plate, And the emitted light is indirectly supplied to the liquid crystal panel.

FIG. 1 is a cross-sectional view of a liquid crystal display device module of a general direct lowering type.

As shown in the figure, a general liquid crystal display module includes a liquid crystal panel 10 including first and second substrates 12 and 14 and a backlight unit 20 behind the liquid crystal panel 10.

The liquid crystal panel 10 is a part that plays a key role in image display and is composed of first and second substrates 12 and 14 which are bonded to each other with a liquid crystal layer interposed therebetween.

First and second polarizing plates 19b and 19a for controlling the polarization direction of light are attached to the front and rear surfaces of the liquid crystal panel 10, respectively.

The backlight unit 20 includes a reflection plate 22 on which a plurality of LEDs 29a are arranged in parallel and on which a diffusion plate 24 and a plurality of optical sheets (26).

An interval A called an optical gap or an air gap exists between the reflection plate 22 and the diffusion plate 24 because the light emitted from each of the plurality of LEDs 29a is diffused It is necessary interval for.

The light emitted from each of the plurality of LEDs 29a located below the liquid crystal panel 10 is superimposed and mixed with each other by the reflection plate 22, the diffusion plate 24, and the plurality of optical sheets 26 And is incident on the liquid crystal panel 10 to provide a surface light source.

The backlight unit 20 and the liquid crystal panel 10 are modularized through the top cover 40, the support main body 30 and the cover bottom 50. The edges of the liquid crystal panel 10 and the backlight unit 20 are rectangular A top cover 40 for covering the front edge of the liquid crystal panel 10 and a cover bottom 50 for covering the back surface of the backlight unit 20 are joined at the front and rear sides respectively in a state in which the support main 30 is wiped, ).

On the other hand, a plurality of LEDs 29a may be sequentially turned on / off to provide a more vivid image, and a local dimming method may be implemented in which light is supplied to specific regions of the liquid crystal panel A liquid crystal display device has been developed. Such a liquid crystal display device can include a plurality of light guide plates in a backlight unit.

When a plurality of light guide plates are applied to the backlight unit, it is important to fix each of the plurality of divided light guide plates so that they do not float.

An object of the present invention is to provide a fixing member capable of stably fixing a plurality of light guide plates when a plurality of light guide plates are provided, and a liquid crystal display device including the same.

In order to achieve the above-mentioned object, according to the present invention, there is provided a liquid crystal display panel comprising a LED assembly, a light guide plate, a diffusion plate, a backlight unit including a plurality of optical sheets, A fixing member for fixing the light guide plate to the cover bottom in a liquid crystal display device includes: a head having a first area in a first direction and seated on the light guide plate; First and second leg portions extending in a second direction perpendicular to the first direction at the head portion and first and second leg portions projecting from ends of each of the first and second leg portions extending in the second direction, And a body portion including first and second hook portions that maintain a predetermined gap with each of the second leg portions.

And the cover bottom and the light guide plate are positioned between the head part and the first hook part and between the head part and the second hook part.

The first and second leg portions are spaced apart from each other by a predetermined distance, and are pinched by a predetermined pressure. When the pressure is removed, the first and second leg portions are returned to a predetermined distance.

Each of the first and second hook portions is pushed into the outer surface of each of the first and second leg portions by a predetermined pressure so as to be fitted to each of the first and second leg portions, In a state in which it is maintained.

Each of the first and second hook portions protrudes in a third direction opposite to the second direction and is in a round shape.

And an end of each of the first and second hook portions is in contact with the back surface of the cover bottom.

According to another aspect of the present invention, there is provided a liquid crystal display comprising: an LED assembly including a plurality of LEDs; a light guide plate disposed on the LED assembly; a diffusion plate disposed on the light guide plate; A backlight unit including the optical sheets of; A liquid crystal panel positioned above the backlight unit; A support main body configured to frame the edges of the backlight unit and the liquid crystal panel; A cover bottom engaging with the support main at the back surface of the backlight unit; A top cover coupled to the support main body at an upper surface of the liquid crystal panel; And a fixing member passing through the light guide plate and the cover bottom to fix the light guide plate to the cover bottom, wherein the fixing member has a head portion having a first area in a first direction and seated on the light guide plate, First and second leg portions extending in a second direction perpendicular to the first direction and first and second leg portions projecting from ends of the first and second leg portions extending in the second direction, And a body portion formed of first and second hook portions which maintain a constant gap with each of the first and second hook portions.

As described above, according to the present invention, by fixing the light guide plate made of a plurality of divided light guide plates to the cover bottom through the fixing member, the light guide plate can be stably fastened to the cover bottom.

Accordingly, it is possible to prevent the lifting phenomenon caused by the light guide plate and to prevent a stain phenomenon that the screen of the liquid crystal display device is stained.

Also, the process of modularizing the light guide plate formed of a plurality of divided light guide plates can be performed more easily and quickly.

1 is a cross-sectional view of a general direct type liquid crystal display device module.
2 is an exploded perspective view illustrating a liquid crystal display device module according to an embodiment of the present invention.
3 is a perspective view schematically showing a light guide plate according to an embodiment of the present invention.
4 is a plan view schematically showing a part of a backlight unit according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along line L 1 to L 2 in region B of FIG. 4 according to the first embodiment of the present invention; FIG.
Fig. 6 is a detailed view of the first fixing member of Fig. 5; Fig.
7 is a view showing the operation of the first fixing member according to the first embodiment of the present invention.
FIG. 8 is a cross-sectional view taken along line L 1 to L 2 in region B of FIG. 4 according to a second embodiment of the present invention; FIG.
FIG. 9 is a view showing the second fixing member of FIG. 8 in detail.
10 is a view showing the operation of the second fixing member according to the second embodiment of the present invention.

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

FIG. 2 is an exploded perspective view illustrating a liquid crystal display module according to an embodiment of the present invention, and FIG. 3 is a perspective view schematically illustrating a light guide plate according to an embodiment of the present invention.

2, the liquid crystal display module 100 includes a liquid crystal panel 110, a backlight unit 120, a support main body 130, a cover bottom 150, and a top cover 140.

First, the liquid crystal panel 110 plays a key role in image display and includes first and second substrates 112 and 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

At this time, a plurality of gate lines and data lines intersect with each other on the inner surface of the first substrate 112, which is usually referred to as a lower substrate or an array substrate, although not clearly shown in the figure, And a thin film transistor (TFT) is provided at each intersection point and is connected in a one-to-one correspondence with the transparent pixel electrode formed in each pixel.

On the inner surface of the second substrate 114 called an upper substrate or a color filter substrate, color filters of red (R), green (G), and blue (B) And a black matrix for covering non-display elements such as a gate line, a data line, and a thin film transistor. In addition, a transparent common electrode covering these elements is provided.

A polarizing plate (not shown) selectively transmitting only specific light is attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

A printed circuit board 118 is connected to at least one edge of the liquid crystal panel 110 via a flexible circuit board or a connection member 116 such as a tape carrier package To the side of the support main body 130 or to the back surface of the cover bottom 150, as shown in FIG.

When the thin film transistor selected for each gate line is turned on by the on or off signal of the gate driving circuit transmitted through the printed circuit board 117, the liquid crystal panel 110 having the above- The signal voltage is transmitted 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.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light so that the difference in transmittance can be displayed as an image.

The backlight unit 120 includes a plurality of LED assemblies 129, a reflective plate 121 disposed on the plurality of LED assemblies 129, a light guide plate 123 disposed on the reflective plate 121, ) And a plurality of optical sheets (126).

The LED assembly 129 is formed by mounting a plurality of LEDs 129a at predetermined intervals on a printed circuit board (PCB) 129b.

The LED assemblies 129 are arranged at a predetermined interval in a direction perpendicular to the longitudinal direction of the cover bottoms 150.

On the other hand, the printed circuit board 129b on which the plurality of LEDs 129a are mounted may correspond to a metal core printed circuit board having a heat dissipating function. On the back surface of the metal core printed circuit board, A heat sink (not shown) may be provided to allow heat generated from each of the plurality of LEDs 129a to be emitted to the outside.

A plurality of reflective through holes 122 are formed in the plurality of LED assemblies 129 to correspond to the plurality of LEDs 129a and each of the plurality of LEDs 129a can pass through. And is located above the LED assembly 129.

More specifically, the reflection plate 121 is seated on the printed circuit board 129b of the LED assembly 129, and each of the plurality of LEDs 129a of the LED assembly 129 receives a plurality of reflection Through holes 122, respectively.

The reflective plate 121 is a white or silver plate covering the entire inner surface of the printed circuit board 129b and the cover bottom 150 except a plurality of LEDs 129a through a plurality of reflective through holes 122, And reflects a part of light emitted from each of the LEDs 129a toward the cover bottom 150 toward the liquid crystal panel 110 side.

A light guide plate 123 is disposed above the reflection plate 121 to realize light of each LED 129a of the LED assembly 129 as a high-quality surface light source.

3, the LGP 123 includes a top surface 200b and a bottom surface 200a, a top surface 200b and a bottom surface 200a of the LGP 123, 202, 203, and 204, which have side surfaces 200c and are arranged side by side on the same line.

At this time, each of the first to fourth divided light pipe panels 201, 202, 203 and 204 is connected to each other by a fixing member (300 of FIG. 6 and 400 of FIG. 9) For this, a plurality of half-holes are formed in each of the first to fourth divided light guide plates 201, 202, 203, 204, and a fixing member (300 in FIG. 6, 400 in FIG. 9) And is inserted through. For example, each of the plurality of half-holes formed in the first divisional light guide plate 201 and the plurality of half-holes formed in the second divisional light guide plate 202 are connected to each other to form the first through-holes, (300 in Fig. 6, 400 in Fig. 9) is inserted through the fixing member. A description thereof will be described later with reference to the drawings.

The LED groove 210 is formed on the lower surface of the first split light guide plate 201 along the longitudinal direction of the first divided light guide plate 201. The LED groove 210 includes a plurality of LEDs 129a are inserted.

Similarly to the first divided light guide plate 201, LED recesses 210 are formed on the lower surfaces of the second to fourth divided light guide plates 202, 203 and 204, respectively.

A plurality of grooves 210 formed on the lower surface 200a of the light guide plate 123 constituted by the first through fourth divided light guide plates 201, The position and number of the assemblies 129 are matched.

That is, each of the LED grooves 210 formed on the lower surface 200a of the light guide plate 123 corresponds to each of the plurality of LED assemblies 129, and the printed circuit board 129b A plurality of LEDs 129a mounted on the LED recesses 210 are inserted into the LED recesses 210, respectively.

On the other hand, the LED groove 210 is not limited to the drawings, and one or more LED grooves 210 may be formed in one divided light guide plate, which is determined by the number of the LED assemblies 129 arranged in the cover bottom 150. For example, when five LED assemblies 129 are arranged on the cover bottom 150 and the light guide plate 123 is composed of the first through fourth divided light guide plates 201, 202, 203, and 204, the light guide plate 123 5 LED grooves 210 corresponding to the five LED assemblies 129 may be formed on the lower surface 200a of the LED module 200. [

The width d1 of the LED groove 210 may be variously formed depending on the size of the LED 129a. The LED groove 210 may be formed from a plurality of LEDs 129a mounted on the printed circuit board 129b It is preferable that an inner area of the LED groove 210 is formed wider than the LED 129a in order to allow more light to enter into the light guide plate 200. [

In addition, the shape of the LED groove 210 can be variously embodied such as a hemispherical shape, a polygonal shape, a rectangular shape, and a trapezoidal shape.

Although not shown in the drawing, a pattern may be formed on one or more surfaces of the upper surface 200b and the lower surface 200a of the light guide plate 123.

First, when a top surface pattern (not shown) is formed on the top surface 200b of the light guide plate 123, the top surface pattern (not shown) serves to guide light emitted from each of the plurality of LEDs 129a, More specifically, the light emitted from each of the plurality of LEDs 129a is totally reflected so that the light is incident into the light guide plate 123.

A part of the light emitted from each of the plurality of LEDs 129a is reflected by the upper surface pattern (not shown) formed on the upper surface 200b of the light guide plate 123 and is incident into the light guide plate 123, The light is transmitted through the upper surface pattern (not shown) and emitted toward the liquid crystal panel 110.

Next, when a back surface pattern (not shown) is formed on the lower surface 200a of the light guide plate 123, the back surface pattern (not shown) is formed on the lower surface 200a of the light guide plate 123, 210 are formed on the lower surface 200a except for the surface. That is, only on the lower surface 200a of the light guide plate 123 that is positioned on the same line.

The backside pattern (not shown) guides the light incident into the light guide plate 123, so that light incident into the light guide plate 123 is reflected toward the liquid crystal panel 110.

When a top surface pattern (not shown) and a back surface pattern (not shown) are formed on the light guide plate 123, light reflected through the top surface pattern (not shown) is reflected by the liquid crystal panel 110 ) Direction.

The back surface pattern (not shown) formed on the upper surface 200b of the light guide plate 123 or the back surface pattern (not shown) formed on the lower surface 200a may be an elliptical pattern, a polygon pattern ), A hologram pattern, and the like. The top surface pattern or the back surface pattern may be formed by a printing method or an injection method.

The light emitted from each of the plurality of LEDs 129a of the LED assembly 129 is reflected by an upper surface pattern (not shown) or a back surface pattern (not shown) of the light guide plate 123, And the incident light is uniformly distributed by total reflection and is emitted to the planar light source, and a part of the light is transmitted through the light guide plate 123 and emitted toward the liquid crystal panel 110.

A diffusion plate 124 and a plurality of optical sheets 126 for uniformity of luminance are disposed on the light guide plate 123 as described above.

Here, the plurality of optical sheets 126 include a diffusion sheet, at least one light collecting sheet, and the like, and may include various functional sheets such as a reflective polarizing film called a dual brightness enhancement film (DBEF).

Accordingly, the light emitted from each of the plurality of LEDs 129a implements a planar light source through the light guide plate 123, and the implemented planar light source sequentially passes through the diffuser plate 124 and the plurality of optical sheets 126 And is incident on the rear liquid crystal panel 110. Using this, the liquid crystal panel 110 displays the high luminance image as an external image.

The liquid crystal panel 110 and the backlight unit 120 are modularized through a top cover 140, a support main 130 and a cover bottom 150. The top cover 140 is disposed on the upper surface and the side surface of the liquid crystal panel 110, And the top cover 140 is opened to display an image to be displayed on the liquid crystal panel 110. The liquid crystal panel 110 is a liquid crystal panel.

The cover bottom 150 on which the liquid crystal panel 110 and the backlight unit 120 are mounted and which is the basis for assembling the entire structure of the liquid crystal display module 100 is formed into a square plate shape with a cover bottom 150, And a pair of side supports 151 in the form of a pair of bars which are coupled to opposite ends of the side support 151.

In addition, the remaining two edges of the cover bottom 150 except for the side supports 151 may be raised obliquely to have a height equal to the height of the cover bottom 150, and a predetermined space in which the backlight unit 120 can be seated can be formed therein.

A plurality of second through holes 152 are formed in the cover bottom 150 at positions corresponding to the plurality of first through holes 206 formed in the light guide plate 123 to form the light guide plate 123, (300 of FIG. 6 and 400 of FIG. 9) inserted through the upper surface of the light guide plate 123 and the cover bottom 150 can be inserted.

The support main body 130 which is mounted on the cover bottom 150 and has a rectangular frame shape covering the edges of the liquid crystal panel 110 and the backlight unit 120 is combined with the top cover 140 and the cover bottom 150.

Meanwhile, the top cover 140 may be referred to as a case top or a top case, and the support main 130 may be referred to as a guide panel or a main support or a mold frame, and the cover bottom 150 may be referred to as a bottom cover.

The LCD module 100 according to the present invention may be divided into a plurality of LED assemblies 129 or a predetermined number of LEDs 129a so that the LED assemblies 129 or the LEDs 129a may be sequentially (On / off) drive by implementing the backlight divided drive can realize more vivid image representation.

Here, the backlight division driving is a driving method in which the area corresponding to the pixel is extinguished while the pixel is responding and the area is lighted after the response is completed. Each area is illuminated only for a predetermined time in each frame, Off.

By performing the backlight division drive for each region through the plurality of LEDs 129a, only the light emitted for each region is supplied to a specific region of the liquid crystal panel 110, thereby brightening the bright image in the image implemented by the liquid crystal panel 110 Or darker images. Accordingly, the contrast ratio can be improved, and a live image can be realized.

In addition, brightness suitable for an image can be adjusted, and an image with dark brightness has light of dark brightness, so that power consumption of the backlight unit 120 can be reduced.

FIG. 4 is a plan view schematically showing a part of a backlight unit according to an embodiment of the present invention, FIG. 5 is a cross-sectional view taken along line L 1 to L 2 in a region B of FIG. 4 according to the first embodiment of the present invention And Fig. 6 is a view showing the first fixing member of Fig. 5 in detail.

4, the light guide plate 123 includes first to fourth divided light guide plates 201, 202, 203, and 204 connected to each other by a plurality of fixing members 300. As shown in FIG. do.

A plurality of half-holes 207 are formed on the inner surfaces of the first divided light pipe 201 and the fourth divided light pipe 204 located on the outer periphery of the first divided light pipe 204. Each of the plurality of the half holes 207 includes a half- do.

And a plurality of half-holes 207 including half grooves 205 are formed on both sides of the second divided light guide plate 202 and the third divided light guide plate 204 located on the inner side.

The side surfaces of the first divided light guide plate 201 and the second divided light guide plate 202 facing each other, the side surfaces of the second divided light guide plate 202 and the third divided light guide plate 203, and the side surfaces of the third divided light guide plate 203 The plurality of half-holes 207 and the half-grooves 205 formed on the side surfaces of the first divided light guide plate 202 and the fourth divided light guide plate 202 are connected to each other to form a plurality of first through holes 208 and insertion grooves 206.

Here, the light guide plate 123 is not limited to the drawings and may be formed of n divided light guide plates. In this case, a plurality of half-holes 207 including a half groove 205 are formed inside the first split light pipe and the n-th split light pipe, and the second split light pipe through the n- A plurality of half-holes 207 including a half-grooves 205 are formed on both sides of the light guide plate.

Similarly, in the first to nth divided light guide plates, the plurality of half-holes 207 and the half-grooves 205 formed on the side of each of the divided light guide plates facing each other are connected to each other to form a plurality of first through holes 208, (206).

Each of the first through fourth divided light pipe panels 201, 202, 203 and 204 is connected to and fixed to each other by the fixing member 300 shown in FIG. 6, and each of the plurality of first through holes 208 The diameter corresponds to the diameter of the body 320 of the fixing member 300 and the size and depth of each of the plurality of insertion grooves 206 corresponds to the thickness and size of the head 310 of the fixing member 300.

A plurality of first through holes 208 formed on the light guide plate 123 constituted by the first through fourth divided light guide plates 201, 202, 203 and 204 are formed in a plurality of second through holes 208 formed on the cover bottom 150, The position and the number of the holes 152 are matched.

The fixing member 300 is inserted into the plurality of first through holes 208 formed on the light guide plate 123 and the plurality of second through holes 152 formed on the cover bottom 150 so that the light guide plate 123 Is fixed to the cover bottom 150.

The fixing member 300 is inserted through the light guide plate 123 and the cover bottom 150 to connect each of the first to fourth divided light guide plates 201, 202, 203 and 204, The light guide plate 123 is fixed to the cover bottom 150 so that the light guide plate 123 composed of the light guide plates 201, 202, 203 and 204 can not move.

This fixing member 300 will be described in detail with reference to Fig.

The head unit 310 fixes the light guide plate 123 so that the light guide plate 123 composed of the first through fourth divided light guide plates 201, 202, 203 and 204 can not be lifted.

The head portion 310 is formed in an elliptical shape having a diameter larger than the diameter of the body portion 320.

The thickness of the head 310 is less than the thickness of the light guide plate 123. When the fixing member 300 is attached to the first through hole 208 of the light guide plate 123 and the cover bottom 150 In the depth range of the insertion groove 206 of the light guide plate 123 so that the upper surface of the head 310 does not protrude from the upper surface of the light guide plate 123 when inserted through the second through hole 152 of the light guide plate 123.

The upper surface of the head portion 310 and the upper surface of the light guide plate 123 may be located on the same line or the upper surface of the head portion 310 may be located lower than the upper surface of the light guide plate 123. [

The body 320 integrally coupled to the head 310 is formed with a groove deep in the center of a second surface opposite to the first surface connected to the head 310, And the first leg portion 321a and the second leg portion 321b are connected to each other at right angles to the second face 321a and 321b, 322b protruding from the first ends of the first stopping protrusions 322a and 322b along the outer sides of the first and second legs 321a and 321b, 323b.

The first and second leg portions 321a and 321b of the body portion 320 are spaced apart from each other by a predetermined distance and are pinched by a pressure of a predetermined size or more, so that the shape of the end of the body portion 320 has a pointed arrow shape And when the pressure equal to or greater than a certain size is removed, it returns to the original state and is spaced apart by a predetermined distance.

Accordingly, when the fixing member 300 is inserted into the light guide plate 123 and the cover bottom 150, pressure is applied to the first and second leg portions 321a and 321b of the body portion 320, The second leg portions 321a and 321b are pinched and the body 320 is inserted into the first through holes 208 of the light guide plate 123 and the second through holes 152 of the cover bottom 150, So that the light guide plate 123 and the cover bottom 150 are fastened together by the member 300.

At this time, the first latching jaws 322a and 322b of the fixing member 300 are partially fixed to the cover bottom 150 to fix the light guide plate 123 to the cover bottom 150 and the second latching jaws 323a, 323b are disposed on the light guide plate 123 and a part of the cover bottom 150 to fix the light guide plate 123 to the cover bottom 150 for the second time.

Meanwhile, the fixing member 300 described above can be removed from the cover bottom 150 and the light guide plate 123 in a specific environment, which will be described with reference to the drawings.

7 is a view showing the operation of the first fixing member according to the first embodiment of the present invention.

When the first and second divided light pipe panels 201 and 202 located on both sides with respect to the fixing member 300 thermally expand due to the temperature and are stretched in the direction a as shown in Fig. 7, The first and second leg portions 321a and 321b are pressed by applying pressure to the first and second leg portions 321a and 321b constituting the body 320 of the member 300 in the direction c.

When the thermal expansion continues even after the first and second leg portions 321a and 321b are disengaged, the ends of the first and second divided light guide plates 201 and 202 are respectively held by the body portion of the fixing member 300 320, so that the first and second split light guide plates 201, 202 are bent in the direction b.

The bending phenomenon causes the first and second divided light guide plates 201 and 202 to lift the fixing member 300 in the + z direction. The lifting force causes the fixing member 300 to be lifted in the + z direction, 1 and the second legs 321a and 321b are further pinched, so that the fixing member 300 is finally detached.

In this way, when the fixing member 300 is detached from the light guide plate 123 and the cover bottom 150, the first to fourth divided light guide plates 201, 202, 203 and 204 are not fixed to the cover bottom 150, And a phenomenon of staining that stains the screen of the liquid crystal display device due to the lifting phenomenon is generated.

FIG. 8 is a cross-sectional view taken along the line B-L in FIG. 4 according to the second embodiment of the present invention, and FIG. 9 is a view showing the second fixing member of FIG. 8 in detail. 2 to 4 except for the fixing member. Therefore, a detailed description thereof will be omitted and the second fixing member will be mainly described.

As shown in FIG. 9, the fixing member 400 includes a head 410 and a body 420.

The head part 410 fixes the light guide plate 123 to prevent the light guide plate 123 composed of the first to fourth divided light guide plates 201, 202, 203 and 204 from being lifted.

Although this head portion 410 is shown in an elliptical shape having a diameter larger than the diameter of the body portion 420, it can be deformed into a circular or other various shapes.

The thickness of the head portion 410 is less than the thickness of the light guide plate 123. The fixing member 400 may be attached to the first through hole 208 and the cover bottom 150 of the light guide plate 123, The upper surface of the head portion 410 does not protrude from the upper surface of the light guide plate 123 when the light guide plate 123 is inserted through the second through hole 152 of the light guide plate 123.

The upper surface of the head portion 410 and the upper surface of the light guide plate 123 may be located on the same line or the upper surface of the head portion 410 may be located lower than the upper surface of the light guide plate 123. [

The body 420 is integrally coupled to the head 410. The body 420 is formed at a center of a second surface opposite to the first surface connected to the head 410, And hook shaped hook portions 423a and 423b which include second leg portions 421a and 421b and protruding toward the head portion 410 at ends of the first and second leg portions 421a and 421b .

The hook portions 423a and 423b are rounded to maintain a constant gap a between the first and second leg portions 421a and 421b.

The rounded hook portions 423a and 423b have a length E3 that occupies about half of the entire length of the fixing member 400 so that the system case (not shown) ) To the liquid crystal display device module 100 including the liquid crystal display device. In this case, the first and second leg portions 421a and 421b are spaced apart from each other by a predetermined distance, and the hook portions 423a and 423b protruding from the first and second leg portions 421a and 421b, respectively, And the second leg portions 421a and 421b, respectively.

The distance E2 between the head portion 410 of the fixing member 400 and the hook portions 423a and 423b is equal to the sum of the thicknesses of the light guide plate 123 and the cover bottom 150, And the cover bottom 150 may be shorter than the sum of the thickness and the cover bottom 150.

8, a part of the light guide plate 123 and the cover bottom 150 are seated between the head part 410 of the fixing member 400 and the hook parts 423a and 423b, The ends of the hook portions 423a and 423b of the light guide plate 400 contact the back surface of the cover bottom 150 so that the fastening force between the light guide plate 123 and the cover bottom 150 is strengthened by the hook portions 423a and 423b.

When a pressure greater than a predetermined magnitude is applied to the body 420 of the fixing member 400, the first and second leg portions 421a and 421b are separated from each other by a predetermined distance, The hook portions 423a and 423b protruding from the respective leg portions 421a and 421b stick to the outer sides of the first and second leg portions 421a and 421b.

The first and second leg portions 421a and 421b are separated from each other by a predetermined distance and the first and second leg portions 421a and 421b are separated from each other by a predetermined distance. The hook portions 423a and 423b protruding from the ends of the first and second leg portions 421a and 421b return to a state of maintaining a constant gap a on the outside of each of the first and second leg portions 421a and 421b.

Therefore, when the fixing member 400 is inserted into the light guide plate 123 and the cover bottom 150, the first and second leg portions 421a and 421b are firstly pushed down by applying pressure to the body portion 420, The hook portions 423a and 423b of the first and second leg portions 421a and 421b are pinched by the car so that the fixing member 400 is engaged with the first through hole 208 of the light guide plate 123 and the cover bottom 150 Through the second through hole 152, the light guide plate 123 is fixed to the cover bottom 150 by the fixing member 400.

10 is a view showing the operation of the second fixing member according to the second embodiment of the present invention.

When the first and second divided light pipe panels 201 and 202 located on both sides with respect to the fixing member 300 thermally expand due to the temperature and extend in the direction a as shown in Fig. 10, The first and second leg portions 421a and 421b are pressed by applying pressure in the direction b to the first and second leg portions 421a and 421b constituting the body portion 420 of the fixing member 400 .

At this time, if the thermal expansion continues even after the first and second leg portions 421a and 421b are disengaged, the ends of the first and second divided light guide plates 201 and 202 may be separated from the body portion The first and second split light guide plates 201 and 202 are bent in the direction b and a force for lifting the fixing member 400 in the + z direction is generated.

Since the ends of the hook portions 423a and 423b of the fixing member 400 are engaged with the back surface of the cover bottom 150, the hook portions 423a, 423b are supported through the back surface of the cover bottom 150, so that the fixing member 400 is not pulled out while being held against the force.

In particular, the hook portions 423a and 423b maintain a constant gap a between the first and second leg portions 421a and 421b, respectively, so as to face the first and second leg portions 421a and 421b, (421a, 421b) and has a larger gap than the constant gap (a).

The second fixing member 400 according to the present invention is configured such that the operator contacts the hook portions 423a and 423b and the hook portions 423a and 423b and the first and second leg portions 421a and 421b, It is easy to detach the second fixing member 400 from the light guide plate 123 and the cover bottom 150. After the second fixing member 400 is mounted and the light guide plate 123 is fixed to the cover bottom 150, the light guide plate 123 and the light guide plate 123 are supported by the supporting force between the hook portions 423a and 423b and the cover bottom 150, The fastening force of the cover tumbs 150 is strengthened so that the second fixing member 400 is not easily detached from the light guide plate 123 and the cover bottom 150.

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

110: liquid crystal panel 120: backlight unit
400: second fixing member 410: head portion
420: body portion 421a, 421b: first and second leg portions
423a, 423b:

Claims (15)

A backlight unit including a plurality of optical sheets, and a liquid crystal panel are modularized through a cover bottom, a support main, and a top cover, and an LED assembly including a plurality of LEDs, a reflective plate, neighboring first and second light guide plates, And a fixing member for fixing the first and second light guide plates to the cover bottom of the liquid crystal display device,
The fixing member
A head having a first area in a first direction;
First and second leg portions extending in a second direction perpendicular to the first direction at the head portion with a second area narrower than the first area and first and second leg portions extending outwardly from the ends of the first and second leg portions, The first and second leg portions being separated from the first and second leg portions and facing each other,
/ RTI >
Wherein the head portion is seated in an insertion groove formed by a half groove provided on each of opposite side surfaces of the first and second light guide plates,
Wherein the body passes through a first through hole formed by a half-hole provided on each of opposite side surfaces of the first and second light guide plates, and penetrates to a second through hole provided in the cover bottom.
The method according to claim 1,
Between the head portion and the first hook portion and between the head portion and the second hook portion,
Wherein the cover bottom and the light guide plate are positioned.
The method according to claim 1,
Wherein the first and second leg portions are spaced apart from each other by a predetermined distance and are pinched by a predetermined pressure, and when the pressure is removed, the first and second leg portions are returned to a predetermined interval.
The method according to claim 1,
Each of the first and second hook portions
The liquid crystal display device according to the present invention returns to a state in which the first and second leg portions come into contact with the outer surfaces of the first and second leg portions, respectively, .
The method according to claim 1,
Each of the first and second hook portions
And protruding in a third direction opposite to the second direction, and being round.
The method according to claim 1,
The ends of each of the first and second hook portions
And contacts the backside of the cover bottom.
The method according to claim 1,
Wherein a thickness of the head portion is lower than or equal to a depth of the insertion groove.
The method according to claim 1,
Wherein the reflection plate includes a plurality of reflection through holes through which a plurality of LEDs pass.
The liquid crystal display of claim 1, wherein the first and second hooks are half the total length of the fixing member.
The method according to claim 1,
The light-
And a groove is formed on a lower surface of the LED assembly corresponding to the LED assembly. delete delete delete delete delete

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