KR102175789B1 - 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 a light leakage phenomenon due to bending of a liquid crystal panel.
A feature of the present invention is that the foam pad for fixing the liquid crystal panel to the guide panel is formed to have an elastic layer, so that some degree of freedom can be given to the liquid crystal panel, so that bending of the liquid crystal panel can be buffered.
Through this, it is possible to prevent the occurrence of a light leakage phenomenon of the liquid crystal panel caused by bending of the liquid crystal panel.
In addition, defects occurred in the process of attaching and fixing the liquid crystal panel on the guide panel, so foam pads remain on the liquid crystal panel and the guide panel even if the liquid crystal panel and the guide panel are separated for rework of the liquid crystal panel and the guide panel. Can be prevented.
Through this, since there is no need to add a process of applying a coolant to remove a separate foam pad, the process time can be shortened and the process cost can be lowered. That is, it is possible to improve the efficiency of the process.

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 a light leakage phenomenon due to bending of a liquid crystal panel.

The liquid crystal display device (LCD), which is advantageous for displaying moving images and has a high contrast ratio, is actively used in TVs and monitors. The optical anisotropy and polarization of liquid crystals The principle of image implementation is shown.

Such a liquid crystal display device uses a liquid crystal panel bonded by interposing a liquid crystal layer between two parallel substrates as an essential component, and a difference in transmittance is realized by changing the alignment direction of liquid crystal molecules by 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 purpose, a backlight with a light source is disposed on the back of the liquid crystal panel.

1 is a cross-sectional view of a liquid crystal display device including a general edge type backlight unit using an LED as a light source.

As shown, a general liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a guide panel 30, a cover bottom 50, and a top cover 40.

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

A backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 is arranged along the longitudinal direction of at least one edge of the guide panel 30, a LED assembly 29 comprising a plurality of LEDs 29a and a PCB 29b on which the LEDs 29a are mounted, and a cover It includes a reflecting plate 25 seated on the bottom 50, a light guide plate 23 seated on the reflecting plate 25, and an optical sheet 21 positioned above the reflector.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the upper surface of the liquid crystal panel 10 and the back of the backlight unit 20 with the edges surrounded by a rectangular guide panel 30 The cover buttum 50 covering the is coupled at the front and rear sides, and is integrated through the guide panel 30 as a medium.

In addition, reference numerals 19a and 19b denote polarizing plates attached to the front and rear surfaces of the liquid crystal panel 10 to control the polarization direction of light.

On the other hand, recently, such liquid crystal display devices are increasingly being used in desktop computer monitors and wall-mounted televisions as well as portable computers, and research has been actively conducted to have a large display area and a remarkably reduced weight and volume. It is going on.

In addition, in addition to the light weight and thinness of the liquid crystal display, there is a demand for a narrow bezel in which the display area is wide and the bezel area, which is a non-display area other than the display area, is formed as small as possible.

Accordingly, by removing the top cover 40 and attaching and fixing the liquid crystal panel 10 to the guide panel 30 through a foam pad such as double-sided tape (not shown), it is lightweight, thin, and narrow. The bezel is implemented.

However, contraction and expansion occur due to the material characteristics of the polarizing plates 19a and 19b attached to both sides of the liquid crystal panel 10.

In this case, in the structure of attaching and fixing the liquid crystal panel 10 on the guide panel 30 through a foam pad (not shown), when contraction and expansion of the polarizing plates 19a and 19b occur, the polarizing plate ( Deformation of the liquid crystal panel 10 due to contraction and expansion of 19a and 19b cannot be buffered, resulting in warpage of the liquid crystal panel 10, thereby causing a light leakage phenomenon of the liquid crystal panel 10.

Therefore, the image quality of the liquid crystal display device is deteriorated.

In addition, if a defect occurs in the process of attaching and fixing the liquid crystal panel 10 on the guide panel 30, the liquid crystal panel 10 and the guide panel 30 are separated and then the liquid crystal panel 10 It is necessary to rework attaching and fixing on the upper part 30, and in this case, in the process of separating the liquid crystal panel 10 and the guide panel 30, a foam pad (not shown) is used as the liquid crystal panel 10 and the guide panel. There is a problem that is not completely removed from 30).

Accordingly, a process of applying a separate coolant to remove the foam pad (not shown) remaining on the liquid crystal panel 10 and the guide panel 30 and a process of removing the remaining foam pad (not shown) are required. It is done with.

This increases the process time and process cost, thereby lowering the efficiency of the process.

A first object of the present invention is to provide a liquid crystal display device capable of buffering deformation due to contraction and expansion of a liquid crystal panel (polarizer) while implementing a light weight, thin, and narrow bezel. To do.

Through this, the second object is to prevent the occurrence of the light leakage phenomenon, and finally, the third object is to prevent the image quality of the liquid crystal display from deteriorating.

In addition, a fourth object is to provide a liquid crystal display device that is easy to rework for attaching and fixing a liquid crystal panel to a guide panel without a separate additional process.

In order to achieve the object as described above, the present invention includes a liquid crystal panel; A backlight unit positioned under the liquid crystal panel; A guide panel including a vertical portion surrounding an edge of the backlight unit, and a horizontal portion vertically bent inward from the vertical portion to support the rear edge of the liquid crystal panel; And a foam pad for attaching and fixing the rear edge of the liquid crystal panel on the horizontal portion, the foam pad having an elastic layer adjacent to the rear surface of the liquid crystal panel on both sides of the cushion foam layer, and the horizontal portion It provides a liquid crystal display device, characterized in that the base layer is provided adjacent.

At this time, the elastic layer and the base layer have the same hardness, the base layer is located under the cushion foam layer, the first adhesive layer is located under the base layer, and the elastic layer is the cushion foam layer It is located on top of, and a second adhesive layer is located on the top of the elastic layer.

In addition, the base layer is made of polyethyleneterephthalate (PET), and the cushion foam layer is made of at least one of poron or urethane material.

In addition, the elastic layer is made of at least one of silicone, gelatin, latex, synthetic rubber, and elastic polyurethane, and a cover top is positioned on the rear surface of the backlight unit.

As described above, the foam pad for fixing the liquid crystal panel to the guide panel according to the present invention is formed to have an elastic layer, thereby providing some degree of freedom to the liquid crystal panel, thereby buffering the warpage of the liquid crystal panel. There is.

Through this, there is an effect of preventing the occurrence of a light leakage phenomenon of the liquid crystal panel caused by bending of the liquid crystal panel.

In addition, defects occurred in the process of attaching and fixing the liquid crystal panel on the guide panel, so foam pads remain on the liquid crystal panel and the guide panel even if the liquid crystal panel and the guide panel are separated for rework of the liquid crystal panel and the guide panel. There is an effect that can prevent it.

Through this, since there is no need to add a process of applying a coolant for removing a separate foam pad, the process time can be shortened and the process cost can be lowered. That is, there is an effect that can improve the efficiency of the process.

1 is a cross-sectional view of a liquid crystal display device including a general edge type backlight unit using an LED as a light source.
2 is a perspective view schematically showing a liquid crystal display according to an embodiment of the present invention.
Figure 3 is a cross-sectional view schematically showing a foam pad according to an embodiment of the present invention.
4A to 4D are cross-sectional views schematically showing a state in which a liquid crystal panel and a guide panel are separated for rework according to an embodiment of the present invention.
Figure 5 is a schematic cross-sectional view of Figure 2 modularized.

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

2 is a schematic perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

As shown, the liquid crystal display device according to the exemplary embodiment of the present invention is largely composed of a liquid crystal panel 110, a backlight unit 120, a guide panel 130, and a cover bottom 150.

At this time, if the direction on the drawing is defined for convenience of explanation, the backlight unit 120 is disposed at the rear of the liquid crystal panel 110 under the premise that the display surface of the liquid crystal panel 110 faces forward, and The cover buttoum 150 is positioned on the rear surface of the backlight unit 120 while the square-shaped guide panel 130 is wrapped around it.

Let's look at each of these in more detail.

First, the liquid crystal panel 110 is a part that plays a key role in image expression of a liquid crystal display device, and the first and second substrates 112 and 114 are bonded to each other, and a liquid crystal layer interposed therebetween. Includes (not shown).

Although not shown in the drawing, a plurality of gate lines and data lines cross each other to define pixels on the inner surface of the first substrate 112 called a lower substrate or an array substrate, and a thin film transistor at each intersection point. : TFT) is provided so that the transparent pixel electrode and the common electrode formed in each pixel are connected.

And the inner surface of the second substrate 114 called the upper substrate or the color filter substrate, as an example, corresponding to each pixel, color filters of red (R), green (G), and blue (B) colors, and these A black matrix covering each of the gate lines, data lines, and thin film transistors is provided.

In addition, at the boundary between the first and second substrates 112 and 114 and the liquid crystal layer (not shown), upper and lower alignment layers (not shown) that determine the initial molecular arrangement direction of the liquid crystal are interposed, 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).

Further, polarizing plates 119a and 119b (refer to FIG. 5) that selectively transmit 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 connecting member 116 such as a flexible circuit board or a tape carrier package (TCP) to guide the module in the process of modularization. The side surface of the panel 130 or the back surface of the cover butt 150 is in close contact.

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 the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode generated thereby, indicating a difference in transmittance.

In addition, the liquid crystal display device according to the present invention includes a backlight unit 120 that supplies light from a rear surface of the liquid crystal panel 110 so that a difference in transmittance of 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 reflector 125, a light guide plate 123 mounted on the reflector 125, and It includes 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 so as to face the light incident surface of the light guide plate 123, and this LED assembly 129 includes a plurality of LEDs 129a and a plurality of The LEDs 129a include a PCB 129b mounted at a predetermined interval.

At this time, the plurality of LEDs 129a emit light having colors of red (R), green (G), and blue (B) respectively toward the front of the light-incident surface of the light guide plate 123, and such a plurality of RGB LEDs 129a ) Can be turned on at once to realize white light by color mixing.

In particular, in recent years, 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, a 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 implementing white light.

The light guide plate 123 into which the light emitted from the plurality of LEDs 129a is incident is evenly distributed 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 several total reflections. Spread to provide a surface light source to the liquid crystal panel 110.

The light guide plate 123 may include a pattern of a specific shape on the lower surface to supply a uniform surface light source. Here, the pattern can be configured in various ways, such as an elliptical pattern, a polygon pattern, and a hologram pattern, in order to guide the light incident into the light guide plate 123. The pattern is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

The reflector 125 is positioned on the rear surface of the light guide plate 123 and reflects the light that has passed 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 upper part of the light guide plate 123 includes a diffusion sheet and at least one light collecting sheet, and diffuses or condenses the light that has passed through the light guide plate 123 to provide a more uniform surface light source to the liquid crystal panel 110. Let's join.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the guide panel 130 and the cover bottom 150, and the cover bottom 150 includes the liquid crystal panel 110 and the backlight unit 120 on which the backlight unit 120 is mounted. By providing a horizontal plane 151 to support the entire liquid crystal display and at the same time, it plays the role of a lower frame that minimizes the occurrence of light loss, and the edge of the horizontal plane 151 is vertically bent to the side ( 153).

Then, the guide panel 130 surrounding the edge of the backlight unit 120 is mounted on the cover buttoum 150.

The guide panel 130 has a rectangular frame shape for supporting the edge of the liquid crystal panel 110 and surrounding the edge of the backlight unit 120, and a vertical portion 131 surrounding the side surfaces of the liquid crystal panel 110 and the backlight unit 120 ) And a horizontal portion 133 that divides the position of the liquid crystal panel 110 and the backlight unit 120 inside the vertical portion 131.

The liquid crystal panel 110 has a rear edge supported by a foam pad 200 such as a double-sided tape, and is attached and fixed on the horizontal portion 133.

Here, a characteristic configuration according to an embodiment of the present invention is that the foam pad 200 includes an elastic layer 207 (see FIG. 3). The elastic layer 207 (refer to FIG. 3) is located adjacent to the rear surface of the liquid crystal panel 110. Through this, the liquid crystal display device according to the exemplary embodiment of the present invention has a state in which the liquid crystal panel 110 is fixed in a modularized state. In addition, a certain degree of freedom can be given.

Therefore, the bending of the liquid crystal panel 110 can be buffered by the degree of freedom of the liquid crystal panel 110, thereby preventing the occurrence of a light leakage phenomenon of the liquid crystal panel 110 caused by the bending of the liquid crystal panel 110. Can be prevented.

In addition, even if a defect occurs in the process of attaching and fixing the liquid crystal panel 110 on the guide panel 130 and the liquid crystal panel 110 and the guide panel 130 are separated, the liquid crystal panel 110 and the guide panel 130 ) Can be prevented from remaining in the foam pad 200. We will look at this in more detail later.

Here, the guide panel 130 may be referred to as a support main or a main support, and a mold frame, and the cover bottom 150 may be referred to as a bottom cover or a lower cover.

The liquid crystal display of the present invention omits the top cover (40 in FIG. 1), which was located in front of the liquid crystal panel 110, so that the liquid crystal display can be thin and light, and the process is simplified. In addition, process cost can be reduced.

In addition, in addition to being lightweight and thin, the display area is expanded by omitting the top cover (40 in FIG. 1), and at the same time, the bezel area, which is a non-display area other than the display area, has a narrow bezel. A liquid crystal display device can be provided.

As described above, in the liquid crystal display device according to the embodiment of the present invention, the foam pad 200 for fixing the liquid crystal panel 110 to the guide panel 130 is formed to have an elastic layer 207 (refer to FIG. 3). , Some degrees of freedom may be given to the liquid crystal panel 110, so that the bending of the liquid crystal panel 110 may be buffered.

Through this, it is possible to prevent the occurrence of a light leakage phenomenon of the liquid crystal panel 110 caused by bending of the liquid crystal panel 110.

In addition, a defect occurs in the process of attaching and fixing the liquid crystal panel 110 on the guide panel 130, so even if the liquid crystal panel 110 and the guide panel 130 are separated, the liquid crystal panel 110 and the guide panel 130 ) Can be prevented from remaining in the foam pad 200.

3 is a cross-sectional view schematically showing a foam pad according to an embodiment of the present invention.

As shown, the foam pad 200 according to the embodiment of the present invention includes a base layer 201, a cushion foam layer 203 above the base layer 201, and a cushion foam layer ( 203) includes an elastic layer 207 positioned on the upper portion, and first and second adhesive layers 205a and 205b formed on the outer surfaces of the base layer 201 and the elastic layer 207.

Here, as the base layer 201, it is preferable to use a polyethylene series including terephthalic acid having good dimensional stability, such as PET (polyethyleneterephthalate).

This base layer 201 has a strong hardness and is not well elongated by force, and serves to buffer the deformation of the foam pad 200.

The cushion foam layer 203 is made of a poron or urethane material, and plays a role of absorbing an impact. The cushion foam layer 203 is applied when a predetermined pressure is applied to the foam pad 200. Will absorb the pressure.

In addition, the elastic layer 207 may be made of a natural or artificial material having high elasticity, and for example, may be made of silicone, gelatin, latex, synthetic rubber, and elastic polyurethane.

The foam pad 200 has a high modulus of elasticity by the elastic layer 207.

In addition, the elastic layer 207 has a certain hardness compared to the cushion foam layer 203 or the first and second adhesive layers 205a and 205b, and the elastic layer 207 has a hardness similar to that of the base layer 201 It is desirable to have.

In this case, the thickness of the elastic layer 207 is not particularly limited within the limit of having a hardness similar to that of the base layer 201 and may have various thicknesses.

The first and second adhesive layers 205a and 205b are provided to attach the foam pad 200 to the guide panel (130 of FIG. 2) and the liquid crystal panel (110 of FIG. 2), and a pressure sensitive adhesive : PSA).

As the base layer 201 and the elastic layer 207 are positioned on both sides of the foam pad 200 with the cushion foam layer 203 interposed therebetween, the liquid crystal panel (110 in FIG. 2) is moved to the guide panel (FIG. 2). 130) when a defect occurs in the process of attaching and fixing the liquid crystal panel (110 in FIG. 2) and the guide panel (130 in FIG. 2) to separate the liquid crystal panel (110 in FIG. 2). Through the elastic layer 207 and the base layer 201 located on the horizontal portion (133 in FIG. 2) side of the guide panel (130 in FIG. 2), the foam pad 200 is connected to the rear surface of the liquid crystal panel (110 in FIG. 2). And it can be neatly removed from the horizontal portion (133 of FIG. 2) of the guide panel (130 of FIG. 2).

That is, when the liquid crystal panel (110 in FIG. 2) and the guide panel (130 in FIG. 2) that are attached and fixed through the foam pad 200 are separated, the cushion foam layer 203 of the foam pad 200 becomes a liquid crystal panel. (110 in FIG. 2) and the guide panel (130 in FIG. 2) are divided into and separated.

At this time, the foam pad 200 remaining on the side of the guide panel (130 in FIG. 2) can be easily separated and removed from the guide panel (130 in FIG. 2) through the base layer 201, and the liquid crystal panel (FIG. 2) The foam pad 200 remaining on the side of 110) can be easily separated and removed from the liquid crystal panel (110 of FIG. 2) through the elastic layer 207.

Through this, a defect occurred in the process of attaching and fixing the liquid crystal panel (110 in FIG. 2) on the guide panel (130 in FIG. 2), and thus the liquid crystal panel (110 in FIG. 2) and the guide panel (130 in FIG. 2) When reworking to attach and fix the liquid crystal panel (110 in FIG. 2) on the guide panel (130 in FIG. 2) again after separation, the liquid crystal panel (110 in FIG. 2) and the guide panel (130 in FIG. 2) In the process of separating), the foam pad 200 is not completely removed from the liquid crystal panel (110 in FIG. 2) and the guide panel (130 in FIG. 2), so that a coolant for removing the foam pad 200 is applied. By not having to add processes, etc., the process time can be shortened and the process cost can be lowered. That is, it is possible to improve the efficiency of the process.

In addition, the foam pad 200 according to the embodiment of the present invention includes an elastic layer 207, so that the foam pad 200 itself has a high modulus of elasticity, so that the liquid crystal panel (110 in FIG. 2) is a liquid crystal panel (FIG. 2). Even if warpage occurs due to contraction and expansion due to the material characteristics of the polarizing plates 119a and 119b attached to the outer surfaces of the two outer surfaces of 110), some degrees of freedom are given to the liquid crystal panel 110 of FIG. 2.

Through this, the bending of the liquid crystal panel (110 in FIG. 2) can be buffered, thereby preventing the occurrence of light leakage of the liquid crystal panel (110 in FIG. 2) caused by the bending of the liquid crystal panel (110 in FIG. 2). can do.

4A to 4D are cross-sectional views schematically showing a state in which a liquid crystal panel and a guide panel are separated for rework according to an embodiment of the present invention.

As shown in FIG. 4A, a portion of the rear edge of the liquid crystal panel 110 is attached and fixed on the horizontal portion 133 of the guide panel (130 in FIG. 2) through the foam pad 200, at this time, the foam pad ( In 200, the first adhesive layer 205a is attached on the horizontal portion 133 of the guide panel (130 in FIG. 2), and the second adhesive layer 205b is attached to the rear edge of the liquid crystal panel 110.

Accordingly, the foam pad 200 is located near the horizontal portion 133 of the guide panel (130 in FIG. 2), and the elastic layer 207 is liquid crystal based on the cushion foam layer 203. It is positioned close to the rear surface of the panel 110.

In this way, when the liquid crystal panel 110 and the guide panel (130 of FIG. 2) are attached and fixed to each other through the foam pad 200, alignment of the liquid crystal panel 110 and the guide panel (130 of FIG. 2), etc. When rework is required due to defects, the liquid crystal panel 110 and the guide panel (130 of FIG. 2) are separated from each other by separating the foam pad 200 through the thread 160 as shown in FIG. 4B.

At this time, as shown in FIG. 4C, the cushion foam layer 203 of the foam pad 200 is divided into the liquid crystal panel 110 and the guide panel (130 in FIG. 2) and separated, and is separated from the rear surface of the liquid crystal panel 110. 2 The adhesive layer 205b, the elastic layer 207, and a part of the cushion foam layer 203 remain, and the first adhesive layer 205a and the base are on the horizontal portion 133 of the guide panel (130 in FIG. 2). The layer 201 and part of the cushion foam layer 203 remain.

Next, as shown in FIG. 4D, the second adhesive layer 205b and the elastic layer 207 remaining on the rear surface of the liquid crystal panel 110, and an elastic layer having a certain hardness among some of the cushion foam layer 203 By applying a certain force to 207, the second adhesive layer 205b and part of the cushion foam layer 203 together with the elastic layer 207 are separated from the rear surface of the liquid crystal panel 110 and removed.

In addition, the first adhesive layer 205a and the base layer 201 remaining in the horizontal portion 133 of the guide panel (130 in FIG. 2), and a base layer 201 having a strong hardness among some of the cushion foam layer 203 ), together with the base layer 201, the first adhesive layer 205a and part of the cushion foam layer 203 are separated from the horizontal portion 133 of the guide panel (130 in FIG. 2). Is removed.

Accordingly, the foam pad 200 can be neatly removed from the rear surface of the liquid crystal panel 110 and the horizontal portion 133 of the guide panel (130 in FIG. 2).

Through this, in the rework of attaching and fixing the liquid crystal panel 110 and the guide panel (130 in FIG. 2) to each other, the process of applying a separate coolant can be omitted, thereby reducing the process time. While still, process cost can be reduced.

5 is a schematic cross-sectional view showing the modularized FIG. 2.

As shown, an optical sheet on the top of the reflective plate 125, the light guide plate 123, the LED assembly 129 comprising the PCB 129b on which the LED 129a and the LED 129a are mounted, and the light guide plate 123 121) are stacked to form a backlight unit (120 in FIG. 2).

In addition, a liquid crystal panel 110 with a liquid crystal layer (not shown) interposed therebetween is located on the first and second substrates 112 and 114 above the backlight unit (120 in FIG. 2), and the first and second substrates 112 and 114 Polarizing plates 119a and 119b that selectively transmit only specific light are attached to the outer surfaces of each of the substrates 112 and 114.

The liquid crystal panel 110 is attached and fixed by supporting the rear edge on the horizontal portion 133 of the guide panel 130 through the foam pad 200, and the backlight unit (120 in FIG. 2) is the guide panel 130 The edge is surrounded by the vertical portion 131 of ).

In addition, the cover buttoum 150 is coupled to the rear surface of the backlight unit (120 in FIG. 2) to be integrated into a module.

At this time, when the liquid crystal panel 110 is driven, the heat generated from the liquid crystal panel 110 causes contraction and expansion due to the material characteristics of the polarizing plates 119a and 119b attached to both sides of the liquid crystal panel 110. .

In such a case, warpage of the liquid crystal panel 110 is caused, and the liquid crystal display device according to an exemplary embodiment of the present invention can buffer the warpage of the liquid crystal panel 110 through the foam pad 200.

Through this, it is possible to prevent the occurrence of a light leakage phenomenon of the liquid crystal panel 110 caused by the bending of the liquid crystal panel 110, and finally, a problem of deteriorating the image quality of the liquid crystal display can be prevented.

That is, in a general liquid crystal display device, the liquid crystal panel is completely attached and fixed to the guide panel, so that even if the liquid crystal panel is warped due to the material characteristics of the polarizing plate, the warpage of the liquid crystal panel cannot be buffered.

Accordingly, the liquid crystal panel is warped, thereby causing light leakage of the liquid crystal panel.

On the other hand, in the liquid crystal display according to the embodiment of the present invention, the foam pad 200 for attaching and fixing the liquid crystal panel 110 to the guide panel 130 includes the elastic layer 207, ) Itself has a high modulus of elasticity, and the liquid crystal panel 110 has some degrees of freedom due to the high modulus of elasticity of the foam pad 200.

Accordingly, when the liquid crystal panel 110 is warped due to the material characteristics of the polarizing plates 119a and 119b, the warpage of the liquid crystal panel 110 is buffered by the degree of freedom given through the foam pad 200. Through this, it is possible to prevent the occurrence of a light leakage phenomenon of the liquid crystal panel 110 caused by bending of the liquid crystal panel 110.

As described above, in the liquid crystal display device according to the embodiment of the present invention, the foam pad 200 for fixing the liquid crystal panel 110 to the guide panel 130 is formed to have an elastic layer 207, so that the liquid crystal panel ( Since some degrees of freedom may be given to 110), the bending of the liquid crystal panel 110 may be buffered.

Through this, it is possible to prevent the occurrence of a light leakage phenomenon of the liquid crystal panel 110 caused by bending of the liquid crystal panel 110.

In addition, in the process of attaching and fixing the liquid crystal panel 110 on the guide panel 130, a defect occurred, so that the liquid crystal panel 110 and the guide panel 130 are reworked to rework the liquid crystal panel 110 and the guide panel 130. Even if 130 is separated, it is possible to prevent the foam pad 200 from remaining in the liquid crystal panel 110 and the guide panel 130.

Through this, since there is no need to add a process of applying a coolant for removing the foam pad 200, the process time can be shortened and the process cost can be lowered. That is, it is possible to improve the efficiency of the process.

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

110: liquid crystal panel (112, 114: first and second substrates)
119a, 119b: first and second polarizing plates
121: optical sheet, 123: light guide plate, 125: reflector, 129: LED assembly (129a: LED, 129b: PCB)
130: guide panel (131: vertical portion, 133: horizontal portion)
150: cover buttom (151: horizontal plane, 153: side)
200: foam pad (201: base layer, 203: cushion foam layer, 205a, 205b: first and second adhesive layers, 207: elastic layer)

Claims (8)

A liquid crystal panel;
A backlight unit positioned under the liquid crystal panel;
A guide panel including a vertical portion surrounding an edge of the backlight unit, and a horizontal portion vertically bent inward from the vertical portion to support the rear edge of the liquid crystal panel;
It includes a foam pad for attaching and fixing the rear edge of the liquid crystal panel on the horizontal portion,
The foam pad has an elastic layer adjacent to the rear surface of the liquid crystal panel on both sides of the cushion foam layer, and a base layer adjacent to the horizontal portion,
The elastic layer is made of a material having elasticity, the base layer is characterized in that made of a material different from the elastic layer,
The elastic layer and the base layer have the same hardness.
delete The method of claim 1,
The base layer is located under the cushion foam layer, the first adhesive layer is located under the base layer,
The elastic layer is positioned above the cushion foam layer, and a second adhesive layer is positioned above the elastic layer.
The method of claim 3,
The base layer is made of PET (polyethyleneterephthalate),
The elastic layer is a liquid crystal display made of at least one of silicone, gelatin, latex, synthetic rubber, and elastic polyurethane.
The method of claim 3,
The cushion foam layer is a liquid crystal display made of at least one of a poron or a urethane material.
delete The method of claim 1,
A liquid crystal display device in which a cover butum is located on a rear surface of the backlight unit.
delete

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