KR102461531B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing deterioration of image quality of a liquid crystal display device having a light weight and a thin bezel and having a narrow bezel.
A feature of the present invention is that a step is provided on the outside of the pad for preventing the flow of the light guide plate, and a fitting hole through which the step of the pad is inserted is provided in the cover bottom, so that a separate pad for positioning the pad at one corner of the light guide plate Since the insertion groove can be omitted, it is possible to prevent image darkness from occurring due to the pad insertion groove.
Accordingly, it is possible to prevent the image quality of the liquid crystal display from being deteriorated.
In particular, even by omitting the pad insertion groove, it is possible to prevent the bezel of one corner where the pad is located from being widened, and also, by making the pad formed in a “L” shape to surround the light carrying surface and the side surface of the light guide plate, It is possible to more stably prevent the light guide plate from flowing.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing deterioration of image quality of a liquid crystal display device having a light weight and a thin bezel and having a narrow bezel.

A liquid crystal display device (LCD), which is advantageous for displaying moving images and has a large contrast ratio, is actively used in TVs and monitors, etc. shows the principle of image realization by

Such a liquid crystal display device consists of a liquid crystal panel, which is bonded by interposing a liquid crystal layer between two parallel substrates, as an essential component, and realizes a difference in transmittance by changing the arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. 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, and for this, a backlight unit with a built-in light source is disposed on the rear surface of the liquid crystal panel.

The backlight unit includes a light source for supplying light, a light guide plate for guiding the light emitted from the light source to the liquid crystal panel, and an optical sheet positioned above the light guide plate to process light uniformly, and the liquid crystal panel and the backlight unit have square edges. In a state surrounded by a frame-shaped guide panel, the case top that surrounds the upper edge of the liquid crystal panel and the cover bottom that covers the back of the backlight unit are combined from the front and back, respectively, and are integrated.

On the other hand, in the liquid crystal display, it is important to configure the LED assembly, which is the light source of the backlight unit, the light guide plate, and the optical sheets so that they do not flow.

In particular, when the light guide plate flows due to external shock or vibration, it causes the LED assembly to be damaged, resulting in lighting failure of the backlight unit, which causes different optical characteristics of the liquid crystal display, thereby causing a problem of image quality degradation. can do.

To this end, as shown in FIG. 1 , in order to prevent the light guide plate 23 from flowing, a pad insertion groove 23a is provided in the light carrying-in part opposite to the light input part where the LED assembly is located, and the pad insertion groove 23a is inserted into the pad insertion groove 23a. The pad 60 is positioned in a compressed state, and the light guide plate 23 is pushed and fixed with the elastic force of the pad 60 to prevent the light guide plate 23 from flowing.

However, since the pad insertion groove 23a is provided at one corner of the light guide plate 23 to position the pad 60 , an image that looks darker in the vicinity of the edge of the light guide plate 23 where the pad 60 is located compared to other areas darkness is observed.

As such image darkness becomes more prominent in a liquid crystal display having a light, thin, and narrow bezel, which is recently required, efforts to solve the problem are required.

The present invention is to solve the above problems, and a first object is to prevent the light guide plate from flowing in a liquid crystal display device having a lightweight and thin narrow bezel.

In addition, it is a second object to prevent the image quality of the liquid crystal display from being deteriorated.

In order to achieve the object as described above, the present invention provides a liquid crystal panel, a backlight unit positioned below the liquid crystal panel, and a reflector, an LED assembly, a light guide plate, and an optical sheet, and the liquid crystal panel and the backlight unit A cover bottom including a lower surface to be seated, an edge side surface bent vertically from the bottom surface, a cover bottom having a fitting hole in the edge side surface, and a pad inserted in a compressed state between the light guide plate and the edge side surface of the cover bottom It includes, and provides a liquid crystal display in which a part of the pad is inserted into the fitting hole.

At this time, the pad is provided with a step as an outer surface in contact with the edge side of the cover bottom, the step is fitted and inserted into the fitting hole, the step is a first stepped surface that is vertically bent from the outer surface, and a second stepped surface bent vertically downward to the first stepped surface, wherein a width of the first stepped surface corresponds to a thickness of the edge side surface.

In addition, the pad is formed in a “L” shape so that an inner surface of the light guide plate is in close contact with a portion of the light-incoming surface of the light guide plate and a portion of the side forming an edge with the light-incoming surface, and the pad is a lower portion facing the lower surface of the cover bottom. A surface, an inner side surface in close contact with the light guide plate, and an inclined surface are provided between the lower surface and the second stepped surface, so that the width of the lower surface is narrower than the width of the upper surface.

In addition, the pad has a vertical end in close contact with the outer surface of the edge side of the cover bottom, a horizontal end bent vertically from the vertical end to be inserted into the fitting hole, and an extension protruding from the horizontal end, to suppress the fitting hole and an elastic end which is inserted through and has an upper surface in close contact with the light guide plate, and the width of the horizontal end corresponds to the thickness of the edge side.

In addition, the thickness of the elastic end gradually decreases from the horizontal end toward the upper surface, and a guide end on which the vertical end is seated is provided on the outer surface of the edge side of the cover bottom.

As described above, according to the present invention, a step is provided on the outside of the pad for preventing the flow of the light guide plate, and a fitting hole through which the step of the pad is inserted is provided in the cover bottom, thereby positioning the pad at one corner of the light guide plate. It is possible to omit a separate pad inserting groove for the purpose of making the screen, and there is an effect that it is possible to prevent image darkness from occurring due to the pad inserting groove.

Through this, it is possible to prevent the image quality of the liquid crystal display from being deteriorated.

In particular, even when the pad insertion groove is omitted, it is possible to prevent the bezel of one corner where the pad is located from being widened.

1 is a plan view schematically illustrating a state in which a pad is 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 illustrating a liquid crystal display device according to a first embodiment of the present invention;
3 is a perspective view schematically illustrating a state of a pad according to a first embodiment of the present invention;
4A is a plan view schematically illustrating a light guide plate and a pad according to the first embodiment of the present invention;
Fig. 4B is a schematic perspective view of a part of Fig. 4A;
Fig. 4c is a schematic cross-sectional view of a modularized part of Fig. 3;
5 is a perspective view schematically illustrating a state of a pad according to a second embodiment of the present invention;
6A is a perspective view schematically illustrating a light guide plate and a pad according to a second embodiment of the present invention;
Fig. 6B is a schematic perspective view of a part of Fig. 6A;

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

- 1st embodiment -

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

As shown, the liquid crystal display 100 according to the first embodiment of the present invention largely includes a liquid crystal panel 110 , a backlight unit 120 , a guide panel 130 , a case top 140 , and a cover bottom ( 150) is composed.

At this time, if the direction in the drawing is defined for convenience of explanation, the backlight unit 120 is disposed at the rear of the liquid crystal panel 110 on the premise 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 with the guide panel 130 in the shape of a square frame wrapped around it, and the cover bottom 150 is positioned on the back side of the backlight unit 120, from the front and rear. combined and united

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 the image expression of the liquid crystal display device 100, and is interposed between the first substrate 112 and the second substrate 114 bonded to each other to face each other. and a liquid crystal layer (not shown).

Although not shown in the drawing, on the inner surface of the first substrate 112 called a lower substrate or an array substrate, a plurality of gate lines and data lines intersect to define a pixel, and at each intersection point, a thin film transistor (thin film transistor) : TFT) is provided and is connected to the transparent pixel electrode formed in each pixel in a one-to-one correspondence.

And on the inner surface of the second substrate 114 called an upper substrate or a color filter substrate, red (R), green (G), and blue (B) color filters as an example corresponding to each pixel and these A black matrix is provided that surrounds each and covers the gate line, the data line, and the thin film transistor.

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

In addition, upper and lower alignment layers (not shown) that determine the initial molecular alignment direction of the liquid crystal are interposed between the first and second substrates 112 and 114 and the liquid crystal layer (not shown), and the first and second substrates A seal pattern (not shown) is formed along the edges of both substrates 112 and 114 to prevent leakage of the liquid crystal layer (not shown) filled between the 112 and 114 .

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

Along one edge of the liquid crystal panel 110, the printed circuit board 117 is connected via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) to guide in the modularization process. It is in close contact with the side 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 scanned and transmitted to the gate line, the liquid crystal panel 110 transmits the image signal of the data line to the corresponding pixel electrode. is transmitted, and the arrangement direction of liquid crystal molecules is changed by the generated electric field between the pixel electrode and the common electrode, indicating a difference in transmittance.

In addition, the liquid crystal display device 100 according to the present invention is provided with a backlight unit 120 that supplies light from a rear surface thereof so that a difference in transmittance displayed by the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes an LED assembly 129 arranged along at least one edge in the longitudinal direction of the cover bottom 150 , a reflecting plate 125 , a light guide plate 123 mounted on the reflecting plate 125 , and 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 located on one side of the light guide plate 123 to face the light incident surface 123a of the light guide plate 123 , and the LED assembly 129 includes a plurality of LEDs 129a. ) and a PCB (129b) on which a plurality of LEDs (129a) are mounted to be spaced apart from each other by a predetermined interval.

At this time, the plurality of LEDs 129a emit light having red (R), green (G), and blue (B) colors in a forward direction toward the light incident surface 123a of the light guide plate 123 , and the plurality of RGB By turning on the LEDs 129a all at once, it is possible to realize white light by color mixing.

In particular, recently, in order to improve luminous efficiency and luminance, a blue LED 129a including a blue LED chip having excellent luminous efficiency and luminance is used, and as a phosphor, 'cerium-doped yttrium aluminum garnet (YAG:Ce)', That is, the blue LED 129a made of a yellow phosphor is used.

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

In addition, the light guide plate 123 to which the light emitted from the plurality of LEDs 129a is incident is uniformly spread over a wide area of the light guide plate 123 while the light incident from the LEDs 129a travels through the light guide plate 123 by total reflection several times. Spread to provide 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 its lower surface to supply a uniform surface light source. Here, the pattern (not shown) can be variously configured such as an elliptical pattern, a polygon pattern, and a hologram pattern to guide the light incident into the light guide plate 123 . In addition, 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 located on the rear surface of the light guide plate 123 , and reflects the light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the luminance of the light.

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

The light passing 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 .

In particular, in the backlight unit 120 of the present invention, a pad 200 for preventing the light guide plate 123 from flowing is positioned at one edge of the light-incoming light surface 123b of the light guide plate 123 .

The pad 200 is formed in a “L” shape to surround the incoming light surface 123b forming one corner of the light guide plate 123 and a side surface 123c adjacent thereto, and a stepped 220 protrudes from the outside.

The pad 200 is made of an elastic material and is inserted between the light guide plate 123 and the cover bottom 150 in a compressed state, and the light guide plate 123 is pushed and fixed with the elastic force to be restored, thereby preventing the light guide plate 123 from flowing. will do

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 . First, the guide panel 130 cuts the edge of the liquid crystal panel 110 . The liquid crystal panel 110 and the backlight unit 120 inside the vertical part 131 and the vertical part 131 surrounding the side surface of the backlight unit 120 in a rectangular frame shape to support and surround the edge of the backlight unit 120 . ) is provided with a horizontal portion 133 for dividing the position.

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

And, this guide panel 130 is seated on the cover bottom 150, the cover bottom 150 is made of a lower surface 151, and the edge of the lower surface 151 is vertically bent edge side 153.

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.

Through the fitting hole 155 of the cover bottom 150, a separate pad insertion groove (23a in FIG. 1) for positioning the pad 200 at one edge of the light guide plate 123 can be omitted, so that the pad is inserted It is possible to prevent the image darkening caused by the grooves (23a in Fig. 1) from occurring.

In particular, even when the pad insertion groove (23a of FIG. 1) is omitted, it is also possible to prevent the bezel of one corner where the pad 200 is located from being widened. We will look at this in more detail later.

And, the case top 140 is configured to cover the upper surface edge and side of the liquid crystal panel (110).

Here, the case top 140 has a rectangular frame shape in which a cross section is bent in an “a” shape to cover the upper and side edges of the liquid crystal panel 110 , and an edge surface 141 covering the side surface of the liquid crystal panel 110 and , composed of an upper surface 143 covering the upper surface edge of the liquid crystal panel 110 vertically from the edge surface 141, opening the front of the case top 140 to display an image implemented in the liquid crystal panel 110 do.

The guide panel 130 , the cover bottom 150 , and the case top 140 cover the upper surface edge of the liquid crystal panel 110 with the guide panel 130 surrounding the edges of the liquid crystal panel 10 and the backlight unit 120 . The case top 140 wrapped around and the cover bottom 150 covering the back surface of the backlight unit 120 are coupled from the front and rear, respectively, to be integrally modularized through the guide panel 130 .

This case top 140 is also referred to as a top cover or a top case, the guide panel 130 is also referred to as a support main or main support, a mold frame, and the cover bottom 150 is also referred to as a bottom cover or a lower cover. do.

At this time, in the liquid crystal display device 100 having the above-described structure, the case top 140 may be deleted in order to realize a light-weight and thin liquid crystal display device that has been recently requested. By removing the case top 140 , the liquid crystal display 100 can be made lightweight and thin, and has the effect of simplifying the process.

In addition, due to the deletion of the case top 140 made of a metal material, it is possible to reduce the process cost.

The liquid crystal display device 100 according to the first embodiment of the present invention described above includes a step 220 on the outside of the pad 200 for preventing the light guide plate 123 from flowing, and a pad on the cover bottom 150 . By having the fitting hole 155 into which the step 220 of the 200 is inserted, a separate pad insertion groove (23a in FIG. 1) for positioning the pad 200 at one edge of the light guide plate 123 is omitted. Thus, it is possible to prevent image darkness from occurring due to the pad insertion groove (23a in FIG. 1).

Through this, the image quality of the liquid crystal display 100 according to the first embodiment of the present invention may be prevented from being deteriorated.

In particular, even when the pad insertion groove (23a in FIG. 1) is omitted, it is possible to prevent the bezel of one corner where the pad 200 is located from being widened, and also, the pad 200 is positioned on the light-receiving surface of the light guide plate 123 . By forming the shape of an “L” to surround the 123b and the side surface 123c, it is possible to more stably prevent the light guide plate 123 from flowing.

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

Fig. 4c is also a schematic cross-sectional view of a modularized part of Fig. 3;

As shown in FIG. 3 , the pad 200 includes a first pad portion 210a and a first pad so as to correspond to an edge formed between the light-incoming light-incoming surface 123b of the light guide plate 123 and a side surface 123e adjacent thereto. It is composed of a second pad part 210b that is vertically connected to the part 210a, so that the overall shape has a “L” shape.

Accordingly, a portion of the light carrying surface 123b and a portion 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, respectively.

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

At this time, a stepped 220 is provided to protrude from the outer surface of the first and second pad parts 210a and 210b, and the stepped 220 is the outer surface 215 of the first and second pad parts 210a and 210b. ) is formed of a first stepped surface 221 vertically bent from, and a second stepped surface 223 vertically bent downward from the first stepped surface 221 .

Accordingly, the cross-sections of the first and second pad parts 210a and 210b including the step 220 form an “L” shape.

At this time, the pad 200 including the step 220 is formed such that the lower surface 213 facing the reflective plate 125 has a narrower width than the upper surface 211. For this purpose, the pad 200 has the lower surface ( 213), the inner side surface 217, and the lower surface 213 and the second stepped surface 223 are formed to have an inclined surface 219 inclined at a predetermined angle.

The width d1 of the second stepped surface 223 can be freely designed within the height H1 of the first and second pad parts 210a and 210b, but the width d2 of the first stepped surface 221 is ) preferably corresponds to the thickness w of the cover bottom 150 .

Therefore, as shown in FIG. 4A , when the reflective plate 125 and the light guide plate 123 are sequentially seated on the horizontal surface 151 of the cover bottom 150 , one edge of the light guide plate 123 and the cover bottom 150 . Insert the pad 200 between one edge of the.

Accordingly, the pad 200 made of an elastic material is inserted into a compressed state between one edge of the light guide plate 123 and one edge of the cover bottom 150, and the light guide plate 123 is pushed and fixed with the elastic force to be restored. The flow of the light guide plate 123 is prevented.

Here, the pad 200 is formed to have a size approximately 1.1 to 1.2 times larger than that of the area between one edge of the light guide plate 123 and one edge of the cover bottom 150 (= hereinafter, referred to as the pad area A). However, when the size of the pad 200 is formed to be 1.2 times larger than that of the pad area A, it may be difficult to insert the pad 200 into the pad area A, and the size of the pad 200 may be difficult to insert. When the pad area A has the same size as the pad area A, the light guide plate 123 cannot be pushed diagonally from one edge where the pad 200 is positioned by the pad 200, so that the flow of the light guide plate 123 cannot be completely blocked. .

At this time, as the pad 200 has an inclined surface 219 on the lower surface 213 , the pad 200 , which is formed to have a larger size than the pad area A, is inserted into the pad area A. , it is possible to more easily insert the pad 200 into the pad area (A).

At this time, in the pad 200 having a “L” shape, the inner surface 217 of the first pad part 210a is in close contact with the light carrying surface 123b forming one corner of the light guide plate 123 , and the second pad part The inner surface 217 of the 210b is positioned in close contact with the side surface 123c adjacent to the light carrying surface 123b.

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

Accordingly, the light guide plate 123 fixes its position in the modularized liquid crystal display device ( 100 in FIG. 2 ), and through this, external shocks or shaking while the light guide plate 123 is accommodated in the cover bottom 150 . This prevents the light guide plate 123 from flowing in a horizontal or vertical direction. Through this, it is possible to prevent the plurality of LEDs ( 129a in FIG. 2 ) from being damaged by the flow of the light guide plate 123 .

In particular, as the light guide plate 123 is pushed in the diagonal direction of the pad 200 by the pad 200 , the light carrying surface 123b of the light guide plate 123 and the side surface 123c adjacent thereto are formed of the cover bottom 150 . A predetermined gap (gap: G) is formed with the edge side surface 153 constituting one corner, and the incoming light surface 123b of the light guide plate 123 and the side surface 123c adjacent thereto and the edge side surface 153 of the cover bottom 150 are formed. The gap G formed between the ) prevents the light guide plate 123 from being bent due to thermal expansion of the light guide plate 123 due to the high-temperature heat generated when the liquid crystal display device ( 100 in FIG. 2 ) is driven.

Here, the light guide plate 123 thermally expands as the temperature increases. .

Here, in the liquid crystal display device ( 100 in FIG. 2 ) of the present invention, the “L”-shaped pad 200 supports the light guide plate 123 by an elastic force while pressing it in a diagonal direction from one edge where the pad 200 is positioned. to fix the position of the light guide plate 123 , and at the same time form a gap G between the incoming light surface 123b and side 123c of the light guide plate 123 and the edge side surface 153 of the cover bottom 150 , so that the light guide plate When 123 thermally expands, the gap G absorbs the thermal expansion of the light guide plate 123 , thereby preventing the light guide plate 123 from being bent.

And, the outer surface 215 of the first and second pad parts 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 parts 210a, The step 220 protruding from the outer surface 215 of 210b) is a fitting hole 155 provided in the edge side 153 of one corner of the cover bottom 150 as shown in FIGS. 4b and 4c. insert is inserted.

At this time, as the width d2 of the first stepped surface 221 of the stepped 200 corresponds to the thickness w of the edge side 153 of the cover bottom 150, the fitting hole of the cover bottom 150 ( The step 200 of the pad 200 fitted with the 155) protrudes outward of the fitting hole 155 of the cover bottom 150 and is not provided.

As such, by providing the fitting hole 155 at one corner of the cover bottom 150, 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. Thus, it is possible to prevent the occurrence of image darkening due to the pad insertion groove (23a in FIG. 1).

Accordingly, it is possible to prevent the image quality of the liquid crystal display device ( 100 in FIG. 2 ) from being deteriorated according to the first embodiment of the present invention.

In particular, even when the pad insertion groove (23a in FIG. 1) is omitted, it is possible to prevent the bezel of one corner where the pad 200 is located from being widened, and also, the pad 200 is positioned on the light-receiving surface of the light guide plate 123 . The flow of the light guide plate 123 can be prevented from occurring more stably by making the light guide plate 123 formed in an “L” shape to surround the 123b and the side surface 123c adjacent thereto, and bending of the light guide plate 123 occurs. It can also be prevented.

At this time, it has been shown and described that the pad 200 according to the first embodiment of the present invention is formed in a “L” shape in close contact with both the light-receiving surface 123b of the light guide plate 123 and the side surface 123c adjacent thereto. , The pad 200 according to the first embodiment may be formed in a bar shape that is in close contact with only a selected one of the light-receiving surface 123b or the side surface 123c of the light guide plate 123 .

In addition, although it has been illustrated and described that the pad 200 is positioned at one corner of the light guide plate 123 , the pad 200 according to the first embodiment of the present invention may be positioned at both corners of the light guide plate 123 . , when the pad 200 is formed in a bar shape, the bar-shaped pad positioned at one corner of the light guide plate 123 may be positioned in close contact with the light carrying surface 123b of the light guide plate 123 , , it is preferable that the bar-shaped pad positioned at the other edge of the light guide plate 123 be positioned in close contact with the side surface (not shown) of the light guide plate 123 .

- Second embodiment -

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

As shown in FIG. 5 , the pad 300 has an overall bar shape, a vertical end 310 having a predetermined thickness, and a horizontal end 320 vertically protruding from the inside of the vertical end 310 . ), and includes an elastic end 330 extending and protruding from the horizontal end 320 .

At this time, 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 the thickness of the edge side of the cover bottom ( w) corresponds to

In addition, the elastic end 330 extending and protruding from the horizontal end 320 directly comes into direct contact with a part of the light carrying surface 123b or side 123c of the light guide plate 123, and the elastic end 330 has the horizontal end ( The thickness s2 is formed to gradually become narrower toward the upper surface 331 which is enlarged and protruded from the 320 and comes in direct contact with the light guide plate 123 .

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

In the pad 300 according to the second embodiment of the present invention, as shown in FIG. 6A , when the reflector 125 and the light guide plate 123 are sequentially seated on the horizontal surface 151 of the cover bottom 150, the pad At 300 , the elastic end 330 is inserted into the fitting hole 157 provided in the edge side 153 of the cover bottom 150 from the outside of the edge side 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 enlarged and protruded from the horizontal end 320 is shown in FIG. 6B . As shown, the elastic end 330 is press-fitted into the fitting hole 157 and penetrates, and the upper surface 331 of the elastic end 330 passing through the fitting hole 157 is the light carrying surface of the light guide plate 123 . (123b) comes into close contact.

In addition, the horizontal end 320 is inserted into the fitting hole 157 provided in the edge side 153 of the cover bottom 150 , and the inner surface of the vertical end 310 is the edge side of the cover bottom 150 . (153) is in close contact with the outer surface.

Here, a guide end 159 on which the vertical end 310 is seated is provided on the outer surface of the edge side surface 153 of the cover bottom 150 , and is in close contact with the outer surface of the edge side surface 153 of the cover bottom 150 . The vertical end 310 does not protrude to the outside of the edge side 153 of the cover bottom 150 .

At this time, the width d5 of the elastic end 330 is formed to be larger than the width d6 between the light carrying surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150, and the elastic end ( The 330 is inserted into a compressed state between the light carrying surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150 .

Accordingly, by pushing and fixing the elastic force of the elastic end 330 of the pad 300 by pushing and fixing the light guide plate 123 , the movement of the light guide plate 123 is prevented.

The width d5 of the elastic end 330 of the pad 300 is about 1.1 ~ Preferably, it is formed to have a size that is 1.2 times larger, and the width d5 of the elastic end 330 of the pad 300 is the light carrying surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150 . When it is formed to be 1.2 times or more larger than the width d6 between the pads 300 , the elastic end 330 of the pad 300 is connected to the light carrying surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150 . It may be difficult to position between d6), the light guide plate 123 cannot be pushed through the elastic end 330 of the pad 300, so that the flow of the light guide plate 123 cannot be completely blocked.

At this time, the elastic end 330 is expanded and protruded from the horizontal end 320 and formed such that the thickness thereof is gradually narrowed toward the upper surface 331 , thereby forming the elastic end 330 on the edge side 153 of the cover bottom 150 . ), it is possible to more easily allow the elastic end 330 of the pad 300 to pass through the fitting hole 157 in the process of inserting the force fit into the fitting hole 157 provided in the .

The pad 300 fixes the position of the light guide plate 123 in the modularized liquid crystal display device ( 100 in FIG. 2 ), and through this, the light guide plate 123 is accommodated in the cover bottom 150 The light guide plate 123 is prevented from flowing in the horizontal or vertical direction due to external impact or shaking. Through this, it is possible to prevent the plurality of LEDs ( 129a in FIG. 2 ) from being damaged by the flow of the light guide plate 123 .

In particular, a certain gap (gap: G) is formed between the light carrying surface 123b of the light guide plate 123 and the edge side surface 153 of the cover bottom 150 through the elastic end 330 of the pad 300, The gap G formed between the light carrying surface 123b of the light guide plate 123 and the edge side 153 of the cover bottom 150 is the light guide plate 123 caused by high-temperature heat generated when the liquid crystal display device ( 100 in FIG. 2 ) is driven. ) to prevent bending of the light guide plate 123 due to thermal expansion.

That is, in the liquid crystal display device of the present invention (100 in FIG. 2 ), the pad 300 pushes and fixes the light guide plate 123 by elastic force, and at the same time, the light carrying surface 123b of the light guide plate 123 and the cover bottom 150 are formed. By forming the gap G between the edge side surfaces 153 , when the light guide plate 123 thermally expands, the gap G absorbs the thermal expansion of the light guide plate 123 , thereby preventing the light guide plate 123 from being bent. will prevent

In this way, the fitting hole 157 is provided in the edge side 153 of the cover bottom 150, and the pad 300 is inserted from the outside of the edge side 153 of the cover bottom 150, and the light guide plate ( Only the elastic end 330 of the pad 300 is positioned between the carrying-in light surface 123b of the 123 and the edge side 153 of the cover bottom 150 , so that the pad 300 is placed at one corner of the light guide plate 123 . Since a separate pad insertion groove (23a in FIG. 1) for positioning can be omitted, it is possible to prevent the image darkening caused by the pad insertion groove (23a in FIG. 1) from occurring.

Accordingly, it is possible to prevent the image quality of the liquid crystal display device 100 in FIG. 2 from being deteriorated according to the second embodiment of the present invention.

In particular, even when the pad insertion groove (23a in FIG. 1) is omitted, it is possible to prevent the bezel of one corner where the pad 300 is located from being widened, and it is also possible to prevent the light guide plate 123 from being bent. have.

At this time, it has been illustrated and described that the pad 300 is positioned to correspond to the incoming light surface 123b of one corner of the light guide plate 123, but the pad 300 may be located at both corners of the light guide plate 123, The pad 300 located at the other corner is positioned to correspond to a side (not shown) adjacent to the light-incoming surface 123b of the light guide plate 123 , so that the flow of the light guide plate 123 is prevented in both the X and Y axes. It is preferable to do

In particular, as the pad 300 is positioned to correspond to both corners of the incoming light surface 123b of the light guide plate 123, the light guide plate 123 is fixed while being pushed in a diagonal direction from one edge of the incoming light surface 123b. , the light carrying surface 123b of the light guide plate 123 and a side (not shown) adjacent thereto form a predetermined gap (gap: G) with both the edge side surface 153 forming one corner of the cover bottom 150, and the liquid crystal The occurrence of bending of the light guide plate 123 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 is more reliably prevented.

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

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

Claims (9)

a liquid crystal panel;
a backlight unit positioned under the liquid crystal panel and including a reflector, an LED assembly, a light guide plate, and an optical sheet;
a cover bottom including a lower surface on which the liquid crystal panel and the backlight unit are seated, an edge side vertically bent from the lower surface, and a fitting hole provided on the edge side;
and a pad inserted in a compressed state between the light guide plate and the edge side of the cover bottom,
The pad is provided with a step as an outer surface in contact with the edge side of the cover bottom, and a part of the step is inserted into the fitting hole,
The stepped surface includes a first stepped surface that is vertically bent from the outer surface, and a second stepped surface that is bent from the first stepped surface,
The pad includes a lower surface facing the lower surface of the cover bottom, an upper surface facing the liquid crystal panel, an inner side surface in close contact with the light guide plate, and an inclined surface between the lower surface and the second stepped surface, A liquid crystal display device in which the width of the lower surface is narrow compared to the width of the upper surface.
delete The method of claim 1,
A width of the first stepped surface corresponds to a thickness of the edge surface.
The method of claim 1,
The pad is formed in a “L” shape such that an inner surface of the pad is in close contact with a portion of the light-transmitting surface of the light guide plate and a portion of the side forming a corner with the light-receiving surface.
delete a liquid crystal panel;
a backlight unit positioned under the liquid crystal panel and including a reflector, an LED assembly, a light guide plate, and an optical sheet;
a cover bottom including a lower surface on which the liquid crystal panel and the backlight unit are seated, an edge side bent from the lower surface, and a fitting hole provided on the edge side;
A vertical end that is inserted in a compressed state between the light guide plate and the edge side surface of the cover bottom and is in close contact with the outer side of the edge side of the cover bottom, and a horizontal end bent vertically from the vertical end and inserted into the fitting hole; , a pad including an elastic end extending from the horizontal end and forcibly inserted through the fitting hole and having an upper surface in close contact with the light guide plate.
7. The method of claim 6,
The width of the horizontal end corresponds to the thickness of the edge side of the liquid crystal display.
7. The method of claim 6,
The thickness of the elastic end gradually decreases from the horizontal end toward the upper surface of the liquid crystal display.
7. The method of claim 6,
A guide end on which the vertical end is seated is provided on an outer surface of the edge side of the cover bottom.

Images