KR20190072819A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device and, more specifically, to a liquid crystal display device capable of preventing degradation of the image quality of a light, thin, and narrow-bezel liquid crystal display device. According to the present invention, a step is arranged on the outside of a pad for preventing movement of a light guide plate and a cover bottom includes an insertion hole press-fit the step of the pad thereto such that a separate pad insertion groove for placing the pad at one corner of the light guide plate can be omitted, thereby preventing a shadow from occurring on an image by the pad insertion groove. Therethrough, the present invention prevents the image quality of the liquid crystal display device from being degraded. In particular, even if the pad insertion groove is omitted, it can be prevented that a bezel of one corner, in which the pad is placed, becomes wider. Moreover, the pad is formed in an L-shape to surround a light input surface and a side surface of the light guide plate, thereby stably preventing movement of the light guide plate.

Description

[0001] Liquid crystal display device [0002]

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 capable of preventing a decrease in image quality of a liquid crystal display device having a lightweight, thin, and narrow bezel.

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 that supplies light, a light guide plate that guides the light emitted from the light source to the liquid crystal panel, and an optical sheet that is positioned above the light guide plate and uniformly processes the light. A case top which surrounds the top edge of the liquid crystal panel in a state of being surrounded by a guide panel of a tee shape, and a cover bottom covering the back surface of the backlight unit are integrally joined to each other at front and rear sides.

On the other hand, it is important that the liquid crystal display device is configured such that the LED assembly, the light guide plate, and the optical sheets, which are the light sources of the backlight unit, are not allowed to flow.

Particularly, when the light guide plate flows due to an external impact or vibration, the LED assembly is damaged, causing a failure in lighting the backlight unit. This is because the optical characteristics of the liquid crystal display device are different, can do.

For this, as shown in FIG. 1, in order to prevent the flow of the light guide plate 23, a pad insertion groove 23a is provided in a loading / unmating portion opposite to a light entrance portion where the LED assembly is located, The pad 60 is positioned in a compressed state and the light guide plate 23 is pushed and fixed by the elastic force of the pad 60 to be restored to prevent the light guide plate 23 from flowing.

However, by providing the pad insertion groove 23a at one corner of the light guide plate 23 for positioning the pad 60, it is possible to obtain an image that is darker than other areas in the vicinity of the edge of the light guide plate 23, Darkness is observed.

This darkness of light is more and more demanded in a liquid crystal display device having a light weight, a thin shape and a narrow bezel which is recently required, and efforts to solve this problem are needed.

SUMMARY OF THE INVENTION It is a first object of the present invention to prevent flow of a light guide plate of a liquid crystal display device having a lightweight and thin green bezel.

A second object of the present invention is to prevent the deterioration of the image quality of the liquid crystal display device.

In order to achieve the above object, the present invention provides a liquid crystal display device comprising a liquid crystal panel, a backlight unit positioned below the liquid crystal panel and including a reflection plate, an LED assembly, a light guide plate and an optical sheet, A cover bottom having a bottom surface on which the light source is mounted and an edge side that is perpendicularly bent from the bottom surface and having a fitting hole in a side surface of the light source; And the pad is partially inserted into the fitting hole.

The pad includes a first stepped surface that is in contact with the side surface of the cover bottom, a first stepped surface that is inserted into the fitting hole and that is vertically bent from the outer surface, And a second stepped surface that is vertically bent downward at the first stepped surface, wherein a width of the first stepped surface corresponds to a thickness of the edge side surface.

The pad is formed in an "a" shape so that an inner surface of the pad is in contact with a part of a light receiving surface of the light guide plate and a part of a side surface of the light incident surface, An inner side surface which is in close contact with the light guide plate, and an inclined surface between the lower surface and the second end surface, the width of the lower surface being narrower than the width of the upper surface.

Further, the pad may include a vertical end that is in close contact with an outer surface of the edge side of the cover bottom, a vertical end that is bent perpendicularly from the vertical end and extends and protrudes from the horizontal end and the horizontal end into which the insertion end is inserted, And an elastic end including a top surface that is inserted through and is in close contact with the light guide plate, and the width of the horizontal end corresponds to the thickness of the edge side.

The elastic end is gradually narrowed in thickness from the horizontal end toward the upper surface, and the outer end of the side edge of the cover bottom has a guide end on which the vertical end is seated.

As described above, according to the present invention, since the step is provided on the outer side of the pad for preventing the flow of the light guide plate and the cover hole has the fitting hole into which the step of the pad is inserted, It is possible to omit a separate pad insertion groove for preventing the occurrence of darkening of the image due to the pad insertion groove.

Thereby, the image quality of the liquid crystal display device can be prevented from being lowered.

Particularly, even if the pad insertion groove is omitted, the bezel at one corner where the pad is located can be prevented from being widened.

1 is a plan view schematically showing a pad inserted into a pad insertion groove of a light guide plate of a general liquid crystal display device.
2 is an exploded perspective view schematically showing a liquid crystal display device according to a first embodiment of the present invention.
3 is a perspective view schematically showing a pad according to a first embodiment of the present invention;
4A is a plan view schematically showing a light guide plate and a pad according to a first embodiment of the present invention.
FIG. 4B is a perspective view schematically showing a part of FIG. 4A. FIG.
Figure 4c is a cross-sectional view schematically illustrating a portion of Figure 3 modularized.
5 is a perspective view schematically showing a pad according to a second embodiment of the present invention;
FIG. 6A is a perspective view schematically showing a light guide plate and a pad according to a second embodiment of the present invention; FIG.
FIG. 6B is a perspective view schematically showing a part of FIG. 6A. FIG.

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

- First Embodiment -

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

The liquid crystal display 100 according to the first embodiment of the present invention mainly includes a liquid crystal panel 110 and a backlight unit 120 and a guide panel 130, a case top 140, a cover bottom 150).

For the sake of convenience, the backlight unit 120 is disposed behind the liquid crystal panel 110 under the assumption that the display surface of the liquid crystal panel 110 faces forward, The case top 140 is positioned in front of the liquid crystal panel 110 in a state where the guide panel 130 in a rectangular shape is wiped and the cover bottom 150 is positioned on the back surface of the backlight unit 120, And are integrated.

Let's take a closer look at each of these.

First, the liquid crystal panel 110 is a part that plays a key role in image display of the liquid crystal display device 100 and includes a first substrate 112 and a second substrate 114 which are bonded to each other, And a liquid crystal layer (not shown).

Although not shown in the figure, a plurality of gate lines and data lines cross each other on the inner surface of a first substrate 112 called a lower substrate or an array substrate, pixels are defined, and a thin film transistor (TFT) : TFT) are 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 the gate lines, the data lines, and the thin film transistors.

In addition, color filters of red (R), green (G), and blue (B) colors and transparent common electrodes covering the black matrix are provided.

An upper and a lower alignment film (not shown) for determining the initial alignment direction of the liquid crystal are interposed at the boundary between the first and second substrates 112 and 114 and the liquid crystal layer (not shown) A seal pattern (not shown) is formed along the edges of the substrates 112 and 114 to prevent leakage of a liquid crystal layer (not shown) filled between the substrates 112 and 114.

Polarizers 119a and 119b (see FIG. 4C) for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

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

Accordingly, when the thin film transistor selected for each gate line is turned on by the on / off signal of the thin film transistor which is transferred to the gate line, the liquid crystal panel 110 supplies the image signal And the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode which is generated thereby, and the difference in transmittance is shown.

In the liquid crystal display device 100 according to the present invention, a backlight unit 120 is provided to supply light from the rear surface of the liquid crystal display device 100 so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed.

The backlight unit 120 includes an LED assembly 129 arranged along at least one longitudinal edge of the cover bottom 150, a reflection plate 125, a light guide plate 123 mounted on the reflection plate 125, And an optical sheet 121 positioned above the light guide plate 123.

The LED assembly 129 is a light source of the backlight unit 120 and is disposed at one side of the light guide plate 123 so as to face the light incident surface 123a of the light guide plate 123. The LED assembly 129 includes a plurality of LEDs 129a And a PCB 129b on which a plurality of LEDs 129a are mounted at a predetermined interval.

At this time, the plurality of LEDs 129a emit light having red (R), green (G), and blue (B) colors toward the light incoming surface 123a of the light guide plate 123, White light by color mixing can be realized by lighting the LED 129a all at once.

In particular, in recent years, a blue LED 129a including a blue LED chip having excellent luminous efficiency and brightness has been used for improving the luminous efficiency and brightness, and a phosphor such as yttrium aluminum garnet (YAG: Ce) doped with cerium, A blue LED 129a made of a yellow phosphor is used.

The blue light emitted from the LED 129a is transmitted through the phosphor and mixed with the yellow light emitted by the phosphor, thereby realizing white light.

The light guiding plate 123 on which the light emitted from the plurality of LEDs 129a is incident is formed such that the light incident from the LED 129a travels in the light guiding plate 123 by total reflection several times, And provides a surface light source to the liquid crystal panel 110.

The light guide plate 123 may include a pattern (not shown) of a specific shape on the lower surface to supply a uniform surface light source. Here, the pattern (not shown) may be configured in various ways such as an elliptical pattern, a polygon pattern, and a hologram pattern to guide light incident into the light guide plate 123 Such a pattern (not shown) is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

The reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects light passing through the back surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of light.

The optical sheet 121 on the light guide plate 123 includes a diffusing sheet and at least one light collecting sheet and may include various functional sheets such as a reflective polarizing film called a dual brightness enhancement film (DBEF).

The light that has passed through the light guide plate 123 is diffused or condensed in the process of passing through the optical sheet 121 to be processed into a high-quality surface light source so that a more uniform surface light source is incident on the liquid crystal panel 110.

Particularly, in the backlight unit 120 of the present invention, a pad 200 for preventing the flow of the light guide plate 123 is positioned at one side edge of the light-incoming surface 123b of the light guide plate 123. [

The pad 200 is formed in a letter shape so as to surround a light receiving surface 123b and a side surface 123c adjacent to the light incident surface 123b and forms a corner of the light guide plate 123 and has a step 220 protruding outward.

The pad 200 is inserted between the light guide plate 123 and the cover bottom 150 in a state of being compressed by an elastic material so that the light guide plate 123 is pushed and fixed by an elastic force to be restored, .

The liquid crystal panel 110 and the backlight unit 120 are modularized through the case top 140, the guide panel 130 and the cover bottom 150. The guide panel 130 first covers the edge of the liquid crystal panel 110 The liquid crystal panel 110 and the backlight unit 120 are disposed inside the vertical part 131 and the vertical part 131 surrounding the side surface of the backlight unit 120, And a horizontal part 133 for distinguishing the position of the horizontal part 133.

The liquid crystal panel 110 is attached and fixed on the horizontal portion 133 through a bonding pad (not shown) such as a double-sided tape.

The guide panel 130 is mounted on the cover bottom 150. The cover bottom 150 includes a bottom surface 151 and a side surface 153 having a vertically bent edge.

At this time, a fitting hole 155 into which the step 220 of the pad 200 is inserted is further provided on the edge side 153 of one corner of the cover bottom 150 where the pad 200 is located.

A separate pad insertion groove (23a in FIG. 1) for positioning the pad 200 at one corner of the light guide plate 123 can be omitted through the fitting hole 155 of the cover bottom 150, It is possible to prevent occurrence of a dark image phenomenon caused by the groove (23a in Fig. 1).

In particular, even if the pad insertion groove (23a in FIG. 1) is omitted, it is also possible to prevent the bezel at one corner where the pad 200 is located from being widened. Let's take a closer look at this later.

The case top 140 is configured to cover the upper surface edge and the side surface of the liquid crystal panel 110.

The case top 140 has a rectangular frame shape bent in a "? &Quot; shape so as to cover the top and side edges of the liquid crystal panel 110, and has an edge surface 141 covering the side surface of the liquid crystal panel 110 And an upper surface 143 which is perpendicular to the edge surface 141 and covers the upper surface edge of the liquid crystal panel 110 so as to open an entire surface of the case top 140 to display an image realized by the liquid crystal panel 110 do.

The guide panel 130 and the cover bottom 150 and the case top 140 are formed so that the edges of the liquid crystal panel 10 and the backlight unit 120 are covered with the guide panel 130, The cover case 140 covering the backside of the backlight unit 120 and the cover bottom 150 covering the backside of the backlight unit 120 are combined at the front and rear sides to be modularly integrated through the guide panel 130. [

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

At this time, in order to realize a lightweight and thin liquid crystal display device which is recently required in the liquid crystal display device 100 having the above-described structure, the case top 140 can be eliminated. The liquid crystal display device 100 can be made light and thin by removing the case top 140, and the process can be simplified.

In addition, the elimination of the case top 140 made of a metal material may reduce the process cost.

The liquid crystal display 100 according to the first embodiment of the present invention has the step 220 on the outer side of the pad 200 for preventing the flow of the light guide plate 123, A separate pad insertion groove (23a in FIG. 1) for positioning the pad 200 at one corner of the light guide plate 123 is omitted by providing the fitting hole 155 into which the step 220 of the light guide plate 200 is inserted. And it is possible to prevent the darkening of the image due to the pad insertion groove (23a in Fig. 1).

Thus, it is possible to prevent the image quality of the liquid crystal display device 100 according to the first embodiment of the present invention from deteriorating.

In particular, even if the pad insertion groove (23a in FIG. 1) is omitted, the bezel at one corner where the pad 200 is located can be prevented from being widened, Shaped so as to surround the side surface 123b and the side surface 123c, it is possible to prevent the flow of the light guide plate 123 more stably.

FIG. 3 is a perspective view schematically showing a pad according to a first embodiment of the present invention, FIG. 4A is a plan view schematically showing a light guide plate and a pad according to a first embodiment of the present invention, FIG. 4B Is a perspective view schematically showing a part of Fig. 4A.

4C is a cross-sectional view schematically showing a portion of FIG. 3 modularized; FIG.

3, the pad 200 includes a first pad portion 210a and a second pad portion 210b so as to correspond to a corner between the light-incoming surface 123b of the light guide plate 123 and the side surface 123e adjacent thereto, And a second pad portion 210b vertically connected to the first portion 210a, so that the overall shape of the second pad portion 210b is "a ".

A part of the light receiving surface 123b and a part of the side surface 123c of the light guide plate 123 are in close contact with the inner surfaces of the first and second pad portions 210a and 210b.

The pad 200 is made of a material having elasticity so as to prevent the flow of the light guide plate 123 by pushing and fixing the light guide plate 123 by an elastic force to be restored between the cover bottom 150 and the light guide plate 123, For example, silicon or rubber. However, the pad 200 of the present invention is not limited thereto and may be made of any material having elasticity.

The first and second pad portions 210a and 210b have protrusions 220 protruding from the outer surface of the first and second pad portions 210a and 210b. And a second end surface 223 bent downward from the first end surface 221 in a vertical direction.

Accordingly, the cross sections of the first and second pad portions 210a and 210b including the step 220 are formed in a " C "shape.

The pad 200 including the step 220 is formed such that the lower surface 213 of the pad 200 facing the reflection plate 125 has a smaller width than the upper surface 211. For this purpose, 213 and an inner side surface 217 and an inclined surface 219 inclining at a certain angle between the lower surface 213 and the second step surface 223. [

The width d1 of the second stepped surface 223 can be freely designed within the height H1 of the first and second pad portions 210a and 210b but the width d2 of the first stepped surface 221 Is preferably set to correspond to the thickness (w) of the cover bottom (150).

4A, when the reflection plate 125 and the light guide plate 123 are sequentially placed on the horizontal surface 151 of the cover bottom 150, one side edge of the light guide plate 123 and the cover bottom 150, The pad 200 is inserted between the two corners.

Therefore, the pad 200 made of an elastic material is inserted between one edge of the light guide plate 123 and one edge of the cover bottom 150 in a compressed state, and the light guide plate 123 is pushed and fixed by an elastic force to be restored Thereby preventing the light guide plate 123 from flowing.

Here, the pad 200 is formed to have a size 1.1-1.2 times larger than a region between one side edge of the light guide plate 123 and one corner of the cover bottom 150 (hereinafter referred to as a pad region A) If the size of the pad 200 is greater than 1.2 times the size of the pad area A, it may be difficult to insert the pad 200 into the pad area A, The light guide plate 123 can not be pushed diagonally from one corner where the pads 200 are positioned by the pads 200 to completely block the flow of the light guide plate 123 .

At this time, the pad 200 has a slope 219 formed on the lower surface 213, so that the pad 200 formed to have a larger size than the pad area A is inserted into the pad area A The pad 200 can be inserted into the pad area A more easily.

At this time, the inner side surface 217 of the first pad portion 210a is in close contact with the receiving light surface 123b forming one corner of the light guide plate 123, The inner side surface 217 of the light emitting surface 210b is in close contact with the side surface 123c adjacent to the light receiving surface 123b.

Accordingly, the light guide plate 123 is fixed while being pushed in a diagonal direction from one corner where the pad 200 is located.

Accordingly, the light guiding plate 123 is fixed in its position in the modular liquid crystal display (100 of FIG. 2). Through this, the light guiding plate 123 is housed in the cover bottom 150, Thereby preventing the light guide plate 123 from flowing in the horizontal or vertical direction. Accordingly, it is possible to prevent a large number of LEDs (129a in FIG. 2) from being damaged by the flow of the light guide plate 123.

Particularly, as the light guide plate 123 is pushed in the diagonal direction of the pad 200 by the pad 200, the light receiving surface 123b of the light guide plate 123 and the side surface 123c adjacent to the light guide plate 123 are in contact with the surface of the cover bottom 150 The light incident side 123b of the light guide plate 123 and the side face 123c adjacent to the light incident side 123b of the light guide plate 123 and the edge side 153 of the cover bottom 150 The gap G formed between the light guide plate 123 and the light guide plate 123 prevents the light guide plate 123 from being warped due to thermal expansion of the light guide plate 123 due to high temperature heat generated when the liquid crystal display device 100 is operated.

Here, when the light guide plate 123 is thermally expanded due to the temperature rise, when the light guide plate 123 is fixed so as not to flow, when the volume of the light guide plate 123 increases due to thermal expansion, the light guide plate 123 is warped .

Here, in the liquid crystal display device 100 of FIG. 2 of the present invention, the "a" -shaped pad 200 presses the light guide plate 123 in the diagonal direction from one corner where the pad 200 is positioned, The gap G is formed between the light incident surface 123b and the side surface 123c of the light guide plate 123 and the edge side surface 153 of the cover bottom 150. As a result, The gap G absorbs the thermal expansion of the light guide plate 123 to prevent the light guide plate 123 from being warped when the light guide plate 123 thermally expands.

The outer surface 215 of the first and second pad portions 210a and 210b is in close contact with the inner surface of the edge side surface 153 of the cover bottom 150. At this time, the first and second pad portions 210a, The step 220 protruding from the outer surface 215 of the cover bottom 150b is inserted into the fitting hole 155 provided in the edge side 153 of one corner of the cover bottom 150 as shown in FIGS. Is inserted.

As the width d2 of the first step surface 221 of the step 200 corresponds to the thickness w of the edge side surface 153 of the cover bottom 150, The step 200 of the pad 200 inserted into the cover bottom 150 does not protrude outside the fitting hole 155 of the cover bottom 150.

By providing the fitting hole 155 at one corner of the cover bottom 150 as described above, a separate pad insertion groove (23a in FIG. 1) for positioning the pad 200 at one corner of the light guide plate 123 is omitted It is possible to prevent the darkening phenomenon caused by the pad insertion groove (23a in Fig. 1) from occurring.

Therefore, it is possible to prevent the image quality of the liquid crystal display (100 of FIG. 2) according to the first embodiment of the present invention from deteriorating.

In particular, even if the pad insertion groove (23a in FIG. 1) is omitted, the bezel at one corner where the pad 200 is located can be prevented from being widened, It is possible to prevent the flow of the light guide plate 123 more stably due to the fact that the light guide plate 123 is formed in a letter shape so as to surround the side wall 123b and the side face 123c adjacent thereto, Also, it can be prevented.

The pad 200 according to the first embodiment of the present invention has been shown and described as being in the form of a letter "A" which is closely contacted with both the light-incoming surface 123b of the light guide plate 123 and the side surface 123c adjacent thereto The pad 200 according to the first embodiment may have a bar shape in which only one selected one of the light receiving surface 123b and the side surface 123c of the light guide plate 123 is closely contacted.

The pad 200 according to the first embodiment of the present invention may be located on both side edges of the light guide plate 123 and the light guide plate 123 may be positioned on one side edge of the light guide plate 123 The pad having a bar shape located at one corner of the light guide plate 123 may be positioned in close contact with the light receiving surface 123b of the light guide plate 123 when the pad 200 is formed in a bar shape And the bar-shaped pad located at the other corner of the light guide plate 123 is preferably placed in close contact with the side surface (not shown) of the light guide plate 123.

- Second Embodiment -

FIG. 5A is a perspective view schematically illustrating a pad according to a second embodiment of the present invention, FIG. 6A is a perspective view schematically showing a light guide plate and a pad according to a second embodiment of the present invention, and FIG. Is a perspective view schematically showing a part of Fig. 6A.

5, the pad 300 has a bar shape and includes a vertical end 310 having a predetermined thickness and a horizontal end 320 vertically protruding from the inner side of the vertical end 310. [ And includes an elastic end 330 that protrudes from the horizontal end 320 in an enlarged manner.

The horizontal end 320 is formed to have a narrower thickness s1 than the vertical end 310 and the elastic end 330 and the width d3 of the horizontal end 320 is set to be smaller than the thickness w).

The elastic end 330 extending from the horizontal end 320 directly comes into contact with a part of the light incident side 123b or side 123c of the light guide plate 123. The elastic end 330 has a horizontal plane The thickness s2 is gradually narrowed toward the upper surface 331, which is enlarged and protruded from the light guide plate 320 and is in direct contact with the light guide plate 123.

The pad 300 is made of a material having elasticity so as to prevent the flow of the light guide plate 123 by pushing and fixing the light guide plate 123 by an elastic force to be restored between the cover bottom 150 and the light guide plate 123, For example, silicon or rubber. However, the pad 300 of the present invention is not limited thereto and may be made of any material having elasticity.

6A, when the reflection plate 125 and the light guide plate 123 are sequentially placed on the horizontal surface 151 of the cover bottom 150, the pads 300 according to the second embodiment of the present invention are arranged such that, The elastic member 330 is inserted into the fitting hole 157 formed in the edge side 153 of the cover bottom 150 from the outer side of the side edge 153 of the cover bottom 150.

At this time, the width d4 of the fitting hole 157 corresponds to the width d3 of the horizontal end 320 of the pad 300, and the elastic end 330 extending and projecting from the horizontal end 320 is shown in FIG. 6B The elastic end 330 penetrating the fitting hole 157 penetrates through the fitting hole 157 and the upper surface 331 of the elastic end 330 penetrates through the insertion hole 157 of the light guide plate 123, (123b).

The horizontal end 320 of the cover bottom 150 is inserted into the fitting hole 157 of the edge side 153 of the cover bottom 150 so that the inner side of the vertical end 310 contacts the edge side (153).

A guide end 159 on which the vertical end 310 is seated is provided on the outer side surface of the edge side 153 of the cover bottom 150 so as to be in close contact with the outer side surface of the edge side 153 of the cover bottom 150. The vertical end 310 of the cover bottom 150 does not protrude outside the edge side 153 of the cover bottom 150.

The width d5 of the elastic edge 330 is formed to be larger than the width d6 between the light receiving surface 123b of the light guide plate 123 and the edge side 153 of the cover bottom 150, 330 are inserted between the light receiving surface 123b of the light guide plate 123 and the side edge 153 of the cover bottom 150 in a compressed state.

Therefore, the light guide plate 123 is prevented from flowing by fixing the elasticity of the elastic end 330 of the pad 300 by pushing the elasticity of the light guide plate 123.

The width d5 of the elastic end 330 of the pad 300 is about 1.1 to about 2.5 times the width d6 between the light receiving surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150. [ The width d5 of the elastic end 330 of the pad 300 is preferably set to be 1.2 times larger than the width d5 of the edge 300 of the light guide plate 123 and the edge side 153 of the cover bottom 150. [ The elastic end 330 of the pad 300 is connected to the light incident side 123b of the light guide plate 123 and the edge side 153 of the cover bottom 150, And the width d5 of the elastic end 330 of the pad 300 may be less than the width between the light incident side 123b of the light guide plate 123 and the side edge 153 of the cover bottom 150 the light guide plate 123 can not be pushed through the elastic end 330 of the pad 300 and the flow of the light guide plate 123 can not be completely blocked.

At this time, the elastic end 330 is formed so as to be enlarged and projected from the horizontal end 320 to be gradually narrowed toward the upper face 331, so that the elastic end 330 is positioned at the edge side 153 of the cover bottom 150 The resilient end 330 of the pad 300 can more easily penetrate the fitting hole 157 in the process of inserting the inserting hole 157 into the inserting hole 157. [

The light guide plate 123 is fixed in the modularized liquid crystal display device 100 by the pad 300 so that the light guide plate 123 is housed in the cover bottom 150 The light guide plate 123 is prevented from being horizontally or vertically moved by external impact or vibration. Accordingly, it is possible to prevent a large number of LEDs (129a in FIG. 2) from being damaged by the flow of the light guide plate 123.

Particularly, a constant gap G is formed between the light receiving surface 123b of the light guide plate 123 and the edge side 153 of the cover bottom 150 through the elastic end 330 of the pad 300, The gap G formed between the light receiving surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150 is formed by the light guide plate 123 The light guide plate 123 is prevented from being warped due to the thermal expansion of the light guide plate 123.

That is, in the liquid crystal display device 100 of FIG. 2 of the present invention, the pad 300 pushes and fixes the light guide plate 123 by the elastic force, and the light receiving surface 123b of the light guide plate 123 and the cover bottom 150 By forming the gap G between the edge side faces 153, the gap G absorbs the thermal expansion of the light guide plate 123 when the light guide plate 123 thermally expands, and warping of the light guide plate 123 occurs .

In this manner, the edge 153 of the cover bottom 150 is provided with the fitting hole 157, and the pad 300 is inserted from the outside of the edge side 153 of the cover bottom 150, Only the elastic end 330 of the pad 300 is positioned between the light receiving surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150 so that the pad 300 is positioned at one corner of the light guide plate 123 It is possible to omit a separate pad insertion groove (23a in Fig. 1) for positioning, and it is possible to prevent the darkening phenomenon caused by the pad insertion groove (23a in Fig. 1) from occurring.

Therefore, it is possible to prevent the image quality of the liquid crystal display (100 of FIG. 2) according to the second embodiment of the present invention from deteriorating.

In particular, even if the pad insertion groove (23a in FIG. 1) is omitted, the bezel at one corner where the pad 300 is located can be prevented from being widened, and the occurrence of warping of the light guide plate 123 can be prevented have.

The pads 300 may be positioned on both sides of the light guide plate 123. The pads 300 may be disposed on both sides of the light guide plate 123, The pad 300 positioned at the other corner is positioned to correspond to a side surface (not shown) adjacent to the receiving light surface 123b of the light guide plate 123 so that the flow of the light guide plate 123 is prevented in both the X axis and the Y axis .

Particularly, since the pads 300 are positioned corresponding to both sides of the light-receiving surface 123b of the light guide plate 123, the light guide plate 123 is fixed while being pushed diagonally from one side edge of the light-incident surface 123b The light receiving surface 123b of the light guide plate 123 and the side surface (not shown) adjacent thereto form a certain gap G with the edge side surface 153 forming one corner of the cover bottom 150, It is more reliably prevented that the light guide plate 123 is warped due to thermal expansion of the light guide plate 123 due to high temperature heat generated when the display device (100 of FIG. 2) is driven.

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.

123: light guide plate
150: cover bottom (153: edge side, 155: insertion hole)
200: pad (220: step)

Claims (9)

A liquid crystal panel;
A backlight unit positioned below the liquid crystal panel and including a reflective plate, an LED assembly, a light guide plate, and an optical sheet;
A cover bottom having a bottom surface on which the liquid crystal panel and the backlight unit are placed and a side surface that is bent perpendicularly from the bottom surface, the cover bottom having the fitting hole in the side surface;
And the cover bottom is press-fitted between the light guide plate and the side edge of the cover bottom in a compressed state,
/ RTI >
Wherein the pad is partially inserted into the fitting hole.
The method according to claim 1,
Wherein the pad is provided with a step on the outer side which is in contact with the edge side of the cover bottom, and the step is inserted into the fit hole.
3. The method of claim 2,
Wherein the step includes a first step surface bent perpendicularly from the outer surface and a second step surface bent downward perpendicularly to the first step surface,
And the width of the first stepped surface corresponds to the thickness of the edge side.
3. The method of claim 2,
Wherein the pad has an inner surface such that an inner surface of the pad is in close contact with a part of a light incident surface of the light guide plate and a surface of a side surface of the light incident surface.
3. The method of claim 2,
Wherein the pad has an inclined surface between a lower surface facing the lower surface of the cover bottom, an inner surface closely contacting the light guide plate, and a lower surface between the lower surface and the second lower surface, the width of the lower surface being narrower Liquid crystal display device.
The method according to claim 1,
The pad is extended and protruded from a vertical end which is in close contact with an outer side surface of the edge side of the cover bottom and a vertical end which is bent perpendicularly from the vertical end and inserted into the insertion hole and from the horizontal end, And an upper surface which is in close contact with the light guide plate.
The method according to claim 6,
And the width of the horizontal plane corresponds to the thickness of the edge side.
The method according to claim 6,
Wherein the thickness of the elastic end gradually decreases from the horizontal end toward the upper surface.
The method according to claim 6,
And a guide end on which the vertical end is seated is provided on an outer side surface of the edge side of the cover bottom.

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