KR101825551B1 - Fixing member for liquid crystal display device - Google Patents

Abstract

The present invention relates to a fixing member for a liquid crystal display.
The fixing member according to the present invention comprises a screw portion fixed to a cover bottom and having a male screw thread to the outside and a support portion having a male screw thread corresponding to an engagement groove and a male screw thread, .
By fixing the light guide plate to the cover bottom while fixing the fixing member in this way, the light guide plate can be fixed more securely.

Description

TECHNICAL FIELD [0001] The present invention relates to a fixing member for a liquid crystal display device,

The present invention relates to a fixing member for a liquid crystal display, and more particularly to a fixing member capable of efficiently fixing a light guide plate.

A liquid crystal display device (LCD), which is advantageous for moving picture display and has a high 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 FIG. 1, a general LCD module includes a liquid crystal panel 10 including first and second substrates 12 and 14 and a backlight unit 20 at a back thereof.

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 printed circuit board 29b on which a plurality of LEDs 29a as a light source are mounted and a reflective plate 22 is disposed on the upper surface of the printed circuit board 29b, A diffusion plate 24 and a plurality of optical sheets 26 are located.

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 The top cover 40 covering the front edge of the liquid crystal panel 10 and the cover bottom 50 covering the back surface of the backlight unit 20 are joined at the front and rear sides respectively, (30).

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 having a plurality of regions can be included in a backlight unit.

When the light guide plate made up of a plurality of regions is applied to the backlight unit, it is important to fix the light guide plate so that it does not float.

This is because when the light guide plate is lifted, a smearing phenomenon occurs on the screen of the liquid crystal display device, and the brightness becomes uneven.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixing member for a liquid crystal display device capable of more stably fixing a light guide plate made up of a plurality of regions.

In order to achieve the above-mentioned object, a fixing member for a liquid crystal display according to the present invention comprises: a support for supporting the diffusion plate and having a coupling groove and a first screw thread corresponding to the coupling groove; And a screw portion having a head portion fixed to the cover bottom and a body portion protruding from the bottom surface of the head portion and having a second screw thread on the outer circumferential surface to be engaged with the first screw thread, Wherein the reflection plate is positioned, the light guide plate is positioned on an upper portion of the reflection plate, and the support portion is screwed to the screw portion in front of the light guide plate.

The supporting portion includes an insert nut having an inner hollow formed therein and an inner circumferential surface of which the first screw thread is formed, in the coupling groove.

Alternatively, the support portion may have the first screw thread formed on an inner circumferential surface of the coupling groove.

The support portion maintains a gap for light diffusion between the light guide plate and the diffusion plate.

The supporting portion may be conical, and the diameter of the coupling groove may correspond to the diameter of the body portion of the threaded portion.

And the head portion includes a step for enlarging a cross-sectional area for seating on the cover bottom.

And the threaded portion is inserted from the front face of the cover bottom to the back face with the body portion facing the diffusion plate.

At this time, the head front surface of the threaded portion and the back surface of the cover bottom are positioned on the same line.

The supporting part is composed of a conical conical part and a cylindrical part connected to the conical part and having the coupling groove and the first screw thread inside.

The cover bottom includes a plurality of through holes for inserting the threaded portion, and a third threaded portion corresponding to the second threaded portion is formed on an inner circumferential surface of the plurality of through holes.

And the threaded portion is inserted from the back side of the cover bottom to the front side with the body portion facing the diffusion plate and screwed to the cover bottom through the second screw thread and the third screw thread.

And a straight or cross-shaped fastening groove is formed on the front surface of the head part.

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 fixed to the cover bottom, and the lifting of the light guide plate can be prevented.

Particularly, the light guide plate is securely fixed to the cover bottom with a fixing member composed of a screw portion and a supporting portion which are screwed to each other, thereby preventing the flow of the light guide plate and preventing the fixing member from being separated from the cover bottom and the light guide plate.

By firmly securing the light guide plate to the cover bottom, it is possible to prevent a stain phenomenon that the screen of the liquid crystal display device becomes stained.

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 sectional view showing a first fixing member according to the first embodiment of the present invention;
5 is a sectional view showing a part of a backlight unit including a first fixing member according to the first embodiment of the present invention.
6 is a sectional view showing a second fixing member according to a second embodiment of the present invention;
7 is a sectional view showing a part of a backlight unit including a second fixing member according to a second embodiment of the present invention;
8 is a sectional view showing a third fixing member according to the third embodiment of the present invention;
9 is a sectional view showing a part of a backlight unit including a third fixing member according to a third embodiment of the present invention;
10 is a sectional view showing a fourth fixing member according to a fourth embodiment of the present invention;
11 is a cross-sectional view showing a support portion of a fifth fixing member according to the fifth 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 cross each other on the inner surface of the first substrate 112, which is usually called a lower substrate or an array substrate, although not clearly shown in the figure, And a thin film transistor (TFT) is provided at each of the intersections, and is connected in one-to-one correspondence with the transparent pixel electrodes formed in the respective pixels.

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.

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 / off signal of the gate driving circuit transmitted through the printed circuit board 118, 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 positioned above the LED 129a.

That is, while the reflection plate 121 is seated on the printed circuit board 129b, each of the LEDs 129a passes through each of the plurality of reflection through holes 122 and is exposed.

The reflection plate 121 is a white or silver plate covering the entire inner surface of the cover bottom 150 and the front surface of the printed circuit board 129b excluding the plurality of LEDs 129a. And reflects a part of the light toward the cover bottom 150 toward the liquid crystal panel 110.

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

3, the light guide plate 123 is composed of first to fourth divided light guide plates 201, 202, 203, 204 arranged side by side on the same line, and the first to fourth light guide plates 123, Each of the quarter-waveguide light guide plates 201, 202, 203 and 204 has a top surface 200b and a bottom surface 200a and two side surfaces 200c connecting the top surface 200b and the bottom surface 200a, I have.

An LED groove 210 is formed along the longitudinal direction on the lower surface 200a of each of the first to fourth divided light guide plates 201, 202, 203 and 204. The LED groove 210 includes an LED assembly 129, A plurality of LEDs 129a are inserted.

The plurality of LED grooves 210 formed on the lower surface 200a of each of the first to fourth divided light guide plates 201, 202, 203 and 204 are connected to the LED assembly 129 arranged on the cover bottom 150, And the number and position of each of them.

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, At least one LED groove 210 is formed on the lower surface 200a of each of the fourth divided light guide plates 201, 202, 203 and 204 to form five LED grooves 210 corresponding to the five LED assemblies 129, May be formed on the light guide plate 123.

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 the cross-sectional contour of the LED groove 210 is formed wider than the LED 129a in order to allow more light to enter the inside of 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 only on the upper surface 200b and the lower surface 200a of the light guide plate 123 or on either side thereof.

When an upper surface pattern (not shown) is formed on a plurality of upper surfaces 200b of the light guide plate 123, the upper surface pattern (not shown) serves to guide light emitted from each of the plurality of LEDs 129a , More specifically, totally reflects light emitted from each of the plurality of LEDs 129a so that 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 an upper surface pattern (not shown) formed on a plurality of upper surfaces 200b of the light guide plate 123 and is incident into the light guide plate 123, Some of 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 a plurality of lower surfaces 200a of the light guide plate 123, the back surface pattern (not shown) And is formed on the lower surface 200a except for the surface constituting the groove 210. [

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.

The top surface pattern (not shown) or the back surface pattern (not shown) may be formed in various shapes such as an elliptical pattern, a polygon pattern, a hologram pattern, The back surface pattern may be formed by a printing method or an injection method.

Accordingly, some of the light emitted from each of the plurality of LEDs 129a is reflected by an upper surface pattern (not shown) or a back surface pattern (not shown) formed on the light guide plate 123 and is incident into the light guide plate 123, The light is emitted to the surface 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.

The cover bottom 150 is formed with a plurality of second through holes 152 at positions corresponding to a plurality of first through holes 208 formed in the light guide plate 123, So that the light guide plate 123 can be fixed to the cover bottom 150. Although not shown in the drawing, the reflector 121 positioned between the cover bottom 150 and the light guide plate 123 is also provided with a plurality of first through-holes (208 in FIG. 5) and a plurality of second through-holes 152 A plurality of third through-holes are formed at positions corresponding to the respective first through-holes.

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 each LED 129a may be divided, By sequentially driving on / off (on / off) driving to realize a more vivid image display.

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 can be made darker. 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 having a dark brightness can have light having a dark brightness, so that power consumption of the backlight unit 120 can be reduced.

Hereinafter, a fixing member for fixing the light guide plate made of the first through fourth divided light guide plates will be described in detail with reference to the drawings.

FIG. 4 is a cross-sectional view showing a first fixing member according to a first embodiment of the present invention, FIG. 5 is a sectional view showing a part of a backlight unit including a first fixing member according to the first embodiment of the present invention, See FIGS. 2 and 3. FIG.

4 and 5, the fixing member 300 includes a head 310 having a predetermined area in the lateral direction and including a protrusion 315 protruding in a direction toward the liquid crystal panel 110, And a body 320 extending from the head 310 toward the cover bottom 150.

The head unit 310 is mounted on the light guide plate 123 to prevent the light guide plate 123 from lifting and fixes the light guide plate 123.

The protrusion 315 formed in the head 310 functions to maintain a gap corresponding to an optical gap between the light guide plate 123 and the diffusion plate 124 in a conical shape. And the distance G1 between the diffusion plate 124 and the diffusion plate 124.

The body 320 extending from the bottom of the head 310 includes first and second legs 321a and 321b spaced apart from each other by a groove formed at the center of the end, The first and second legs 321a and 321b from one end of the first stopping protrusions 322a and 322b and the first stopping protrusions 322a and 322b protruding from the ends of the outer side surfaces of the first and second legs 321a and 321b, And second stopping protrusions 323a and 323b protruding to a predetermined thickness along the respective outer surfaces.

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.

3) of the light guide plate 123 (see FIG. 3) to connect the first to fourth divided light guide plates 201, 202, 203, 204, And serves to fix each of the four-division light guide plates (201, 202, 203, and 204 in FIG. 3) so as not to be lifted.

3, each of the first through fourth divided light guide plates 201, 202, 203, and 204 includes a plurality of half-holes including a half groove for allowing a plurality of fixing members 300 to be inserted therethrough. 3) of the first split light guide plate (201 in Fig. 3) and the fourth split light guide plate (204 in Fig. 3) A plurality of half-holes are provided on both sides of each side.

If the light guide plate 123 is formed of n divided light guide plates, the second divided light guide plate to the (n-1) -th divided light guide plate located on the inner side of the first divided light guide plate and the nth divided light guide plate, And a plurality of half-holes are provided on both sides of each of them.

3) of the first divided light guide plate (201 in Fig. 3) and the second divided light guide plate (202 in Fig. 3) facing each other, the second divided light guide plate 202 And the plurality of half-holes and the half-grooves formed on the side of each of the third split light guide plate 203 (FIG. 3) and the fourth split light guide plate 202 (FIG. 3) are connected to each other to form a plurality of first through holes 208 And an insertion groove 206, as shown in FIG.

At this time, the plurality of first through holes 208 correspond to the positions and the number of the plurality of second through holes 152 formed on the cover bottom 150.

When each of the plurality of fixing members 300 is inserted to fix the light guide plate 123, the pressure is applied to the first and second leg portions 321a and 321b so that the first and second leg portions 321a, The body 320 is inserted into each of the first through holes 208 of the light guide plate 123 and the second through holes 152 of the cover bottom 150 while the head 310 is inserted And is seated in the insertion groove 206.

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.

5, each of the plurality of fixing members 300 is inserted into the first through-hole 208 of the light guide plate 123 and the second through-hole 152 of the cover bottom 150, (123) to the cover bottom (150).

The diffuser plate 124 is positioned above the light guide plate 123 in which the plurality of fixing members 300 are inserted. The light guide plate 123 and the diffuser plate 124 are formed. The interval G1 spreads the light emitted from each of the plurality of LEDs (129a in FIG. 2) widely, thereby eliminating the hot spot phenomenon caused by the vertical light.

The first through holes 208 of the light guide plate 123 and the second through holes 152 of the cover bottom 150 correspond to the body 320 of each of the plurality of fixing members 300 described above, Each of the plurality of fixing members 300 may be caused to flow by a tolerance, which may cause unevenness of luminance and a stain phenomenon on a liquid crystal display screen.

In particular, the tolerance between the body portion 320 of each of the plurality of fixing members 300 and the corresponding second through-hole 208 of the light guide plate 123 and the second through-hole 152 of the cover bottom 150 is There is a limit in that it is difficult to reduce the tolerance mechanically since it must be designed to be larger than the allowable range required in optical design.

In addition, due to this tolerance and other causes, each of the plurality of fixing members 300 may be detached from the cover bottom 150 and the light guide plate 123, which will be described with reference to the drawings.

As shown in FIG. 5, when the first and second divided light guide plates 201 and 202 located on both sides of the fixing member 300 are thermally expanded to extend in the direction a, The first and second leg portions 321a and 321b are pressed by applying a pressure in the direction c to the first and second leg portions 321a and 321b constituting the body portion 320.

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 leg portions 321a and 321b can be further pinched and the fixing member 300 can be pulled out.

If the fixing member 300 is separated from the first and second divided light guide plates 201 and 202 and the cover bottom 150, the first and second divided light guide plates 201 and 202 are respectively attached to the cover bottom 150 And the liquid crystal display device is stained on the screen due to the floating phenomenon, so that a smear phenomenon is generated and a luminance uniformity phenomenon occurs.

Hereinafter, the fixing member including the supporting portion and the screw portion which are screw-coupled to each other will be described in detail, unlike the fixing member in which the head and the body are integrally formed as described above.

FIG. 6 is a cross-sectional view showing a second fixing member according to a second embodiment of the present invention, FIG. 7 is a cross-sectional view showing a part of a backlight unit including a second fixing member according to a second embodiment of the present invention, See FIGS. 2 and 3. FIG.

6 and 7, the fixing member 400 includes a support portion 410 for supporting the diffusion plate 124 positioned thereon and a second through hole 152 of the cover bottom 150, And a threaded portion 420 which is inserted and fixed.

The support portion 410 serves to maintain a gap G2 for light diffusion between the light guide plate 123 and the diffusion plate 124. [

The support portion 410 has a conical shape and includes an engagement groove 412 in which an female screw thread 412a is formed on an inner peripheral surface of the support portion 410. The diameter a1 of the engagement groove 412 is inserted into the engagement groove 412 Corresponds to the diameter of the body portion 424 of the threaded portion 420.

The threaded portion 420 includes a head portion 422 that is seated in the cover bottom 150 through the second through hole 152 and a male thread 424a that protrudes from the bottom surface of the head portion 422 and is engaged with the female thread 412a. And a cylindrical body portion 424 provided on the outer peripheral surface.

Here, the head portion 422 of the screw portion 420 includes a step 422a that enlarges a cross-sectional area for seating on the cover bottom 150. [

The threaded portion 420 is inserted into the second through hole 152 from the front side of the cover bottom 150 in a state where the body portion 424 is set to face the liquid crystal panel (110 in FIG. 2) The screw portion 420 is fastened and fixed to the cover bottom 150 while the step 422a provided on the cover portion 422 is seated on the cover bottom 150. [

When the screw portion 420 is fastened and fixed to the cover bottom 150 as described above, the front surface of the head portion 422 is positioned on the same line as the back surface of the cover bottom 150.

And a plurality of first light guide plates 201 and 202 having a plurality of first through holes 208 and a plurality of second light guide plates 201 and 202, The screw portion 420 is inserted into the coupling groove 412 of the support portion 410 and the female screw thread portion 420 of the support portion 410 is inserted into the engagement groove 412 of the support portion 410, 412a of the threaded portion 420 and the male thread 424a of the threaded portion 420 are screwed together.

A part of the supporting part 410 is seated in the insertion groove 206 of the light guide plate 123 and the light guide plate 123 is fixed to the cover bottom 150, (123).

As described above, by using the fixing member 400 including the screw portion 420 inserted and fixed to the cover bottom 150 and the supporting portion 410 screwed thereto, the fixing member 400 and the corresponding light guide plate 123 and the plurality of first through holes 208, the third through holes and the second through holes 152 of the reflector 121 and the cover bottom 150 can be reduced to within an allowable range required in the optical design do.

That is, the light guide plate 123 can be more efficiently fixed to the cover bottom 150, the flow of the light guide plate 123 can be prevented, and the detachment of the fixing member 400 from the light guide plate 123 and the cover bottom 150 can be prevented .

FIG. 8 is a cross-sectional view showing a third fixing member according to a third embodiment of the present invention, FIG. 9 is a cross-sectional view illustrating a part of a backlight unit including a third fixing member according to the third embodiment of the present invention, See FIGS. 2 and 3. FIG. Here, the third fixing member has the same structure except for the configuration of the second fixing member and the screw portion in Figs. 6 and 7.

8 and 9, the fixing member 500 is fixed to the second through-hole 152 of the cover bottom 150 by a supporting portion 510 for supporting the diffusion plate 124 positioned thereon, As shown in FIG.

The support portion 510 has a conical shape and includes an engagement groove 512 in which the first female thread 512a is formed on the inner circumferential surface of the support portion 512. The diameter a1 of the engagement groove 512 is smaller than the diameter a1 of the engagement groove 512, Corresponds to the diameter of the body portion 524 of the threaded portion 520 to be welded.

The threaded portion 520 includes a head portion 522 that is seated in the cover bottom 150 through the second through hole 152 and a male thread portion 524 that protrudes from the bottom surface of the head portion 522 and is engaged with the first female thread 512a. And a cylindrical body portion 524 having an outer circumferential surface 524a.

A screw driver (not shown) is used on the front surface of the head part 524 to form a threaded or cross-shaped fastening groove 522a for fastening or detaching the screw part 520 to or from the cover bottom 150.

The threaded portion 520 is screwed to the second through hole 152 from the back surface of the cover bottom 150 to the front in a state where the body portion 524 is set to face the liquid crystal panel 110 The threaded portion 520 is fastened and fixed to the cover bottom 150 while the threaded portion 522 is seated on the backside of the cover bottom 150.

To this end, a second female thread 152b corresponding to the male screw thread 524a is formed on the inner circumferential surface of the second through hole 152 provided in the cover bottom 150. [

A reflective plate 121 having a plurality of third through holes at an upper portion of the screw portion 520 and a plurality of first through holes 208 formed of a plurality of divided light guide plates 201 and 202, The screw 520 is inserted into the coupling groove 512 of the support portion 510 and the first arm 520 of the support portion 510 is inserted into the engagement groove 512 of the support portion 510. [ The thread 512a and the male thread 524a of the thread 520 are screwed together.

A part of the support part 510 is seated in the insertion groove 206 of the light guide plate 123 and the light guide plate 123 is fixed to the cover bottom 150 by the screw part 520 being screw- (123).

As described above, by using the fixing member 500 including the screw portion 520 screwed to the cover bottom 150 and the support portion 510 screwed to the cover bottom 150, the light guide plate 123, the reflection plate 121, The tolerance between the plurality of first through holes 208, the third through holes and the second through holes 152 of the optical element 150 can be reduced to within the allowable range required in the optical design.

Accordingly, it is possible to more reliably fix the light guide plate 123 to the cover bottom 150 and prevent the light guide plate 123 from flowing, and to prevent the detachment of the fixing member 500 from the light guide plate 123 and the cover bottom 150 .

Particularly, as the screw portion 520 of the fixing member 500 is screwed to the cover bottom 150, the fixing member 500 is more firmly fixed to the cover bottom 150, thereby realizing a liquid crystal display device resistant to external shocks .

10 is a cross-sectional view showing a fourth fixing member according to the fourth embodiment of the present invention. Here, the screw portion of the fourth fixing member and the screw portion of the second fixing member shown in Figs. 6 and 7 have the same structure.

10, the fixing member 600 includes a support portion 610 for supporting the diffusion plate 124 positioned thereon and a second through hole 152 of the cover bottom 150, And an insert nut 630 for coupling the support portion 610 and the screw portion 620 to each other.

The support portion 610 has a conical shape and has an engagement groove 612 into which an insert nut 630 can be inserted.

The threaded portion 620 has a head portion 622 that is seated in the cover bottom 150 through the second through hole 152 and a cylindrical portion 624 that protrudes from the bottom surface of the head portion 622 and has a male thread 624a on the outer peripheral surface. And a body portion 624.

Here, the head portion 622 of the screw portion 620 includes a step 622a that enlarges a cross-sectional area for seating on the cover bottom 150. [

The insert nut 630 has a hollow inside and an inner thread 630a on the inner circumferential surface thereof.

The outer diameter of the insert nut 630 corresponds to the diameter a2 of the coupling groove 612 of the support portion 610 so that the insert nut 630 is inserted into the coupling groove 612 and fixed.

The inner diameter a3 of the insert nut 630 smaller than the diameter a2 of the coupling groove 612 corresponds to the diameter of the body portion 624 of the threaded portion 620 so that the insert nut 630 is inserted The support portion 610 is inserted into the screw portion 620 and screwed.

The threaded portion 620 is inserted into the second through hole 152 from the front surface of the cover bottom 150 in a state where the body portion 624 is oriented toward the liquid crystal panel 110 in FIG. The screw portion 620 is fastened and fixed to the cover bottom 150 while the stepped portion 422a provided on the cover bottom portion 422 is seated on the cover bottom portion 150. [

When the screw portion 620 is fastened and fixed to the cover bottom 150 as described above, the front surface of the head portion 622 is positioned on the same line as the back surface of the cover bottom 150.

And a plurality of divided light guide plates 201 and 202 and having a plurality of first through holes 208. The reflective plate 121 has a plurality of third through holes at the upper portion of the screw portion 620, The screw portion 620 is inserted into the engagement groove 612 of the support portion 610 and the female screw portion 610 of the support portion 610 is inserted into the engagement groove 612 of the support portion 610. [ 612a of the threaded portion 620 and the male thread 624a of the threaded portion 620 are screwed together.

A part of the support part 410 is seated in the insertion groove 206 of the light guide plate 123 and the light guide plate 123 is fixed to the light guide plate 123 by screwing the screw part 620 and the support part 610, And is fixed to the cover bottom 150 to prevent the light guide plate 123 from flowing.

It is a matter of course that the support part and the insert nut according to the present invention can be applied instead of the support part of the third fixing member of Fig.

11 is a cross-sectional view illustrating a support according to a fifth preferred embodiment of the present invention.

11, the support portion 810 is formed by joining the conical portion 815 and the cylindrical portion 814. As shown in FIG.

More specifically, the support portion 810 includes a conical conical portion 815 for supporting the diffusion plate 124 disposed thereon and an engagement groove 812 for forming the female thread 812a on the inner circumferential surface thereof And a cylindrical cylindrical portion 814.

Here, the cylindrical portion 814 of the support portion 810 has a cylindrical shape so that an operator can more easily grasp the assembly.

The support portion 810 of the present invention as described above can be applied instead of the conical support portion shown in Figs.

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
300, 400, 500, 600: Fixing member
410, 510, 610, 810: supports 412a, 512a, 812a: female threads
412, 512, 812: coupling grooves 420, 520, 620:
422, 522, 622: head portion 422a, 622a:
522a: fastening groove 424, 524, 624:
424a, 524a, 624a: male thread 630: insert nut
630a: female thread 815: conical part
814:

Claims (24)

1. A backlight unit which is mounted on a cover bottom in a modularization process including an LED assembly, a reflection plate positioned thereon, a light guide plate, a diffusion plate, and a plurality of optical sheets,
A support portion supporting the diffusion plate positioned at an upper portion and having a coupling groove formed therein and a first screw thread corresponding to the coupling groove; a head portion fixed to the cover bottom portion; And a body portion having a second threaded portion on an outer circumferential surface thereof, wherein the reflective plate is positioned on an upper portion of a screw portion seated on the cover bottom, the light guide plate is positioned on an upper portion of the reflection plate, And a fixing member
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The light guiding plate is composed of a plurality of divided light guiding plates. The light guiding plate is provided with side grooves and a half-hole, which are connected to each other on the side surfaces of the divided light guiding plates facing each other to form an insertion groove and a first through-
Wherein the fixing member is inserted through the first through hole and the support portion of the fixing member is seated in the insertion groove to fix the plurality of divided light guide plates to the cover bottom.
The method according to claim 1,
The support
Wherein the coupling groove includes an insert nut in which a hollow is formed and the first screw thread is formed on an inner circumferential surface thereof.
The method according to claim 1,
The support
And the first screw thread is formed on the inner circumferential surface of the coupling groove.
4. The compound according to any one of claims 1 to 3,
The support
Wherein a gap for light diffusion is maintained between the light guide plate and the diffuser plate.
4. The compound according to any one of claims 1 to 3,
The support
And the diameter of the coupling groove corresponds to the diameter of the body portion of the threaded portion.
The method according to claim 1,
The head
And a step for expanding a cross-sectional area for seating on the cover bottom.
The method according to claim 6,
Wherein the head front surface of the threaded portion and the back surface of the cover bottom are positioned on the same line.
The method according to claim 1,
And the diameter of the first through hole is larger than the diameter of the body portion.
The method according to claim 1,
The support
And a cylindrical portion connected to the conical portion and having the coupling groove and the first screw thread therein.
The method according to claim 1,
Wherein the cover bottom includes a plurality of through holes through which the threaded portion is inserted,
And a third thread corresponding to the second thread is formed on an inner circumferential surface of the plurality of through holes.
11. The method of claim 10,
The threaded portion
Wherein the cover body is inserted from the back surface of the cover bottom to the front side in a state where the body part faces the diffusion plate and is screwed to the cover bottom through the second screw thread and the third screw thread.
The method according to claim 1 or 11,
On the front face of the head portion
Wherein a fastening groove of a straight or cross shape is formed.
A backlight unit including a LED assembly, a reflection plate, a light guide plate, a diffusion plate, and a plurality of optical sheets, and a liquid crystal panel are modularized through a cover bottom, a support main and a top cover. In the fixing member for fixing,
A support for supporting the diffusion plate and having a coupling groove formed therein and a first screw thread corresponding to the coupling groove;
And a screw portion having a head portion fixed to the cover bottom and a body portion having a second screw thread protruding from a bottom surface of the head portion and engaged with the first screw thread,
Wherein the reflective plate is positioned on an upper portion of a screw portion seated on the cover bottom, the light guide plate is positioned on an upper portion of the reflector, the support portion is screwed to the screw portion,
The light guiding plate is composed of a plurality of divided light guiding plates. The light guiding plate is provided with side grooves and a half-hole, which are connected to each other on the side surfaces of the divided light guiding plates facing each other to form an insertion groove and a first through-
Wherein the fixing member is inserted through the first through hole and the support portion of the fixing member is seated in the insertion groove to fix the plurality of divided light guide plates to the cover bottom.
14. The method of claim 13,
The support
Wherein the coupling groove includes an insert nut in which a hollow is formed and the first screw thread is formed on an inner circumferential surface thereof.
14. The method of claim 13,
The support
And the first screw thread is formed on the inner peripheral surface of the coupling groove.
The method of any one of claims 13 to 15,
The support
And a gap for light diffusion is maintained between the light guide plate and the diffusion plate.
The method of any one of claims 13 to 15,
The support
And the diameter of the coupling groove corresponds to the diameter of the body of the threaded portion.
14. The method of claim 13,
The head
And a step for expanding a cross-sectional area for seating on the cover bottom.
19. The method of claim 18,
Wherein the head front surface of the threaded portion and the back surface of the cover bottom are positioned on the same line.
14. The method of claim 13,
And the diameter of the first through hole is larger than the diameter of the body portion.
14. The method of claim 13,
The support
And a cylindrical portion connected to the conical portion and having the coupling groove and the first screw thread therein.
14. The method of claim 13,
Wherein the cover bottom includes a plurality of through holes through which the threaded portion is inserted,
And a third thread corresponding to the second thread is formed on an inner circumferential surface of the plurality of through holes.
23. The method of claim 22,
The threaded portion
Wherein the cover body is inserted from the back face of the cover bottom to the front face in a state where the body part faces the diffusion plate and is screwed to the cover bottom through the second screw thread and the third screw thread.
24. The method according to claim 13 or 23,
On the front face of the head portion
Wherein a fastening groove of a straight or cross shape is formed.

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