KR102271067B1 - 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 that blocks heat and moisture from the outside.
A feature of the present invention is to position the foam pad between the inner surface of the first horizontal surface of the top cover and the upper surface of the third vertical part of the guide panel. Accordingly, it is possible to block the inflow of heat and moisture from the outside of the modular liquid crystal display to the inside of the modular liquid crystal display.
Through this, it is possible to prevent damage to the polarizing plates attached to the front and rear surfaces of the liquid crystal panel due to the heat and moisture introduced from the outside, or to prevent the optical sheet from moving in the backlight unit from occurring. This deterioration can be prevented.
In addition, since the LED is not exposed by heat and moisture flowing in from the outside, it is possible to prevent the luminous efficiency of the LED from being lowered or the lifespan of the LED from being shortened.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device that blocks heat and moisture from the outside.

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., because of the optical anisotropy and polarization of liquid crystal. shows the principle of image realization by

Such a liquid crystal display device consists of a liquid crystal panel bonded together with a liquid crystal layer interposed between two parallel substrates as an essential component, and a difference in transmittance is realized 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 a self-luminous element, a separate light source is required to display the difference in transmittance as an image, and for this purpose, a backlight with a built-in light source is disposed on the rear surface of the liquid crystal panel.

1 is a cross-sectional view of a liquid crystal display 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 face to face with a liquid crystal layer interposed 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, and includes an 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 reflective plate 25 seated on the bottom 50, a light guide plate 23 seated on the reflective plate 25, and an optical sheet 21 positioned above the reflective plate.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the upper surface edge of the liquid crystal panel 10 and the backlight unit 20 in a state in which the edge is surrounded by the guide panel 30 having a rectangular frame shape. The cover bottom 50 covering the rear surface is coupled from the front and rear, respectively, and is modularized through the guide panel 30 .

In addition, unexplained 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, respectively.

On the other hand, such a modular liquid crystal display device has a disadvantage of being very vulnerable to external heat and moisture. In particular, when external heat and moisture penetrate into the interior of the modular liquid crystal display device, the liquid crystal panel 10 is caused by heat and moisture introduced from the outside. The polarizing plates 19a and 19b attached to the front and rear surfaces of the display may be damaged, or the optical sheet 21 of the backlight unit 20 may move.

Due to such a difference in luminance, a non-uniformity phenomenon appears in the image, which causes a problem of deterioration of the display quality of the liquid crystal display.

In addition, heat and moisture introduced from the outside cause deterioration and corrosion of the LED 29a of the backlight unit 20, thereby reducing the luminous efficiency of the LED 29a or shortening the lifespan of the LED 29a.

In particular, between the top cover 40 and the guide panel 30, a gap (G) is generated due to the assembly tolerance in the process of modularizing the top cover 40 and the guide panel 30. By G), heat and moisture from the outside easily flow into the modularized liquid crystal display, exacerbating the above problems.

SUMMARY OF THE INVENTION The present invention is to solve the above problems, and a first object is to prevent heat or moisture from flowing into a modular liquid crystal display device from the outside.

Through this, a second object is to prevent the display quality of the liquid crystal display from being deteriorated or the luminous efficiency and lifespan of the LED from being lowered.

In order to achieve the object as described above, the present invention provides a liquid crystal panel, a backlight unit positioned under the liquid crystal panel, a top cover positioned above the liquid crystal panel, and side surfaces of the backlight unit, the liquid crystal panel Provided is a liquid crystal display including a foam pad having a rectangular frame shape, positioned between the guide panel on which the guide panel is seated, a cover bottom on which the backlight unit is seated, and the top cover and the guide panel.

Here, the top cover includes a first vertical portion covering the side surface of the liquid crystal panel, and a first horizontal portion covering the upper edge of the liquid crystal panel, the foam pad is in close contact with the inner surface of the first horizontal portion, the The guide panel includes a second vertical portion surrounding the side surface of the backlight unit, a second horizontal portion supporting the liquid crystal panel vertically from the second vertical portion, and a side surface of the liquid crystal panel protruding vertically from the second horizontal portion. It includes a third vertical portion surrounding the foam pad is in close contact with the upper surface of the third vertical portion.

In addition, the guide panel includes a second vertical portion surrounding a side surface of the backlight unit, a second horizontal portion supporting the liquid crystal panel vertically from the second vertical portion, and the liquid crystal protruding vertically from the second horizontal portion. It includes a third vertical portion surrounding the side of the panel, the upper surface of the third vertical portion is provided with a step outside the third vertical portion, the foam pad is seated on the step, the upper surface of the third vertical portion is the top It is in close contact with the inner surface of the first horizontal portion of the cover.

In addition, a touch panel is positioned on the top of the top cover.

As described above, according to the present invention, by locating a foam pad between the inner surface of the first horizontal surface of the top cover and the upper surface of the third vertical part of the guide panel, heat and moisture from the outside of the modular liquid crystal display are modularized. It has the effect of blocking the inflow into the interior of the

Through this, it is possible to prevent damage to the polarizers attached to the front and rear of the liquid crystal panel or the wobbling of the optical sheet of the backlight unit by heat and moisture introduced from the outside, thereby preventing the display quality of the liquid crystal display. There is an effect that can prevent this deterioration.

In addition, since the LED is not exposed by heat and moisture flowing in from the outside, it is possible to prevent the luminous efficiency of the LED from being lowered or the lifespan of the LED from being shortened.

1 is a cross-sectional view of a liquid crystal display including a general edge-type backlight unit using an LED as a light source;
2 is a perspective view schematically illustrating a liquid crystal display device according to a first embodiment of the present invention;
Fig. 3 is a schematic cross-sectional view of a modularized part of Fig. 2;
4 is a cross-sectional view schematically illustrating a modularized liquid crystal display according to a second embodiment of the present invention.
5A to 5B are photographs showing a liquid crystal display device without a foam pad.
6A to 6B are photographs showing a liquid crystal display device in which a foam pad is positioned between a top cover and a guide panel according to a second embodiment of the present invention.

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

- 1st embodiment -

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

As shown, the liquid crystal display according to the first embodiment of the present invention is largely composed of a liquid crystal panel 110 , a backlight unit 120 , a guide panel 130 , a top cover 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 top cover 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, and includes a first substrate 112 and a second substrate 114 bonded to each other and a liquid crystal layer interposed therebetween. (not shown) is included.

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 cross to define a pixel, and a thin film transistor (thin film) at each intersection point transistor (TFT) is provided and is connected to the transparent pixel electrode formed in each pixel in a one-to-one correspondence.

At this time, a plurality of pixel electrodes are separated in a bar shape and spaced apart from each other, and a common wiring is formed on the same layer in parallel with the gate wiring, and is electrically connected to the common wiring and alternates with a plurality of pixel electrodes separated in each pixel. spaced apart to form a plurality of common electrodes.

Here, when a plurality of pixel electrodes and a common electrode are configured to be spaced apart in each pixel, the liquid crystal panel 110 operating in the IPS mode is formed, and only the plate-shaped pixel electrode except for the common electrode is the first substrate 112 . ), it forms the liquid crystal panel 110 operating in any one of TN mode, ECB mode, and VA mode.

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 to surround each of the gate lines, data lines, and thin film transistors.

In addition, upper and lower alignment layers (not shown) that determine the initial molecular arrangement 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, first and second polarizing plates 119a and 119b (refer to FIG. 3 ) 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 surface of the panel 130 or the back surface of the cover bottom 150 .

In the liquid crystal panel 110, 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 image signal of the data line is transmitted to the corresponding pixel electrode. 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 is provided with a backlight unit 120 that supplies light from the rear surface of the liquid crystal panel 110 so that the difference in transmittance is expressed to the outside.

The backlight unit 120 includes an LED assembly 129, a white or silver reflective plate 125, a light guide plate 123 seated on the reflective plate 125, and an optical sheet 121 interposed thereon. .

The LED assembly 129 is a light source of the backlight unit 120 , and is positioned on one side to face the light incident surface of the light guide plate 123 , and a plurality of LEDs 129a and a plurality of LEDs 129a are mounted with a predetermined interval therebetween. and a PCB (129b) that is used.

The light guide plate 123 to which the light emitted from the plurality of LEDs 129a of the LED assembly 129 is incident is 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. The surface light source is provided to the liquid crystal panel 110 by evenly spreading over a wide area of

The light guide plate 123 may include a pattern having a specific shape on its lower surface in order to supply a uniform surface light source. Here, the pattern may be variously configured such as an elliptical pattern, a polygonal pattern, a hologram pattern, etc. 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 reflecting 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 by diffusing or condensing the light passing through the light guide plate 123 , a more uniform surface light source is provided to the liquid crystal panel 110 . to get hired

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the guide panel 130, and the cover bottom 150, the top cover 140 is the upper edge of the liquid crystal panel 110 and Constructed to cover the sides.

Here, the top cover 140 has a rectangular frame shape in which a cross-section is bent in a “L” shape to cover the upper surface and side edges of the liquid crystal panel 110 , and the first vertical part 141 covering the side surface of the liquid crystal panel 110 . ) and a first horizontal portion 143 that is perpendicular from the first vertical portion 141 and covers the upper surface edge of the liquid crystal panel 110 , and is implemented in the liquid crystal panel 110 by opening the front of the top cover 140 . configured to display an image that becomes

The guide panel 130 supports the edge of the liquid crystal panel 110 and has a rectangular frame shape to surround the edge of the backlight unit 120 , and includes a second vertical part 131 surrounding the side surface of the backlight unit 120 , 2 A second horizontal portion 133 is included in the inner side of the vertical portion 131 to separate the positions of the liquid crystal panel 110 and the backlight unit 120 , and a second horizontal portion 133 is disposed on the second horizontal portion 133 . ) is formed to protrude vertically from the third vertical portion 135 surrounding the side surface of the liquid crystal panel 110 is configured.

The liquid crystal panel 110 is attached and fixed on the second horizontal portion 133 through an adhesive pad (not shown) such as a double-sided tape, and the side surface is guided through the third vertical portion 135 .

And, this guide panel 130 is seated on the cover bottom 150, the cover bottom 150 is composed of a horizontal surface 151 and a fourth vertical portion 153 in which the edge of the horizontal surface 151 is vertically bent. .

The guide panel 130 , the cover bottom 150 , and the top cover 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 top cover 140 and the cover bottom 150 covering the rear surface of the backlight unit 120 are coupled from the front and rear, respectively, to be integrated into a module through the guide panel 130 .

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

In addition, the touch panel 160 is located on the top of the top cover 140, and the liquid crystal display device according to the first embodiment of the present invention uses the touch panel 160 to display text or pictures that are recently required more conveniently. You will have the advantage of being able to accurately input.

Here, the liquid crystal display according to the first embodiment of the present invention is characterized in that a foam pad (200) is positioned between the guide panel (130) and the top cover (140).

The foam pad 200 has a rectangular frame shape corresponding to the first horizontal portion 143 of the top cover 140 , the inner surface of the first horizontal portion 143 of the top cover 140 and the guide panel 130 . It is positioned between the upper surfaces of the third vertical part 135 .

By the foam pad 200, the liquid crystal display according to the first embodiment of the present invention can block the inflow of heat and moisture from the outside to the inside of the modular liquid crystal display.

Through this, the polarizing plates 119a and 119b attached to the front and rear surfaces of the liquid crystal panel 110 are damaged by heat and moisture introduced from the outside, or the optical sheet 121 of the backlight unit 120 is damaged. It is possible to prevent the occurrence of humming and the like.

Accordingly, it is possible to prevent deterioration of the display quality of the liquid crystal display device, deterioration of the luminous efficiency of the LED 129a, or shortening of the lifespan of the LED 129a.

This will be described in more detail with reference to FIG. 3 .

FIG. 3 is a schematic cross-sectional view of a part of FIG. 2 that has been modularized;

As shown, the LED assembly 129 and the light guide plate 123 are formed on the upper part of the LED assembly 129 and the light guide plate 123 including the reflecting plate 125, the light guide plate 123, the LED 129a and the PCB 129b on which the LED 129a is mounted. 121) are stacked to form the backlight unit 120 .

In addition, the first and second substrates 112 and 114 and the liquid crystal panel 110 having a liquid crystal layer (not shown) interposed therebetween are positioned on the backlight unit 120 , and the first and second substrates 112 . , 114), polarizing plates 119a and 119b that selectively transmit only a specific light are attached to the outer surface of each.

The backlight unit 120 and the liquid crystal panel 110 have an edge surrounded by a guide panel 130 , and a cover bottom 150 is coupled to the rear surface thereof, and a top surrounding the upper surface edge and the side surface of the liquid crystal panel 110 . The cover 140 is coupled to the guide panel 130 and the cover bottom 150 .

Here, the backlight unit 120 is guided through the second vertical portion 131 of the side surface of the guide panel 130, the liquid crystal panel 110 to the inside of the second vertical portion 131 of the guide panel 130. It is seated and supported on the protruding second horizontal portion 133 through an adhesive pad (not shown) such as a double-sided tape, and the side surface of the liquid crystal panel 110 is guided through the third vertical portion 135 .

In addition, the touch panel 160 is positioned in front of the top cover 140 .

Here, between the outer surface of the second vertical portion 131 of the guide panel 130 and the inner surface of the first vertical portion 141 of the top cover 140, the guide panel 130 and the top cover 140 are modularized. In the process, a gap (G) is generated due to the assembly tolerance.

By this gap (G), heat and moisture are easily introduced into the modularized liquid crystal display device from the outside. Here, the liquid crystal display device according to the first embodiment of the present invention has a first horizontal portion ( By positioning the foam pad 200 between the inner surface of the 143) and the upper surface of the third vertical part 135 of the guide panel 130, the passage through which heat and moisture from the outside flows into the modular liquid crystal display device is blocked. do.

Looking at this in more detail, the liquid crystal display module modularized through the top cover 140 , the guide panel 130 , and the cover bottom 150 , as the touch panel 160 is positioned in front of the top cover 140 , the liquid crystal display The panel 110 and the backlight unit 120 have a configuration that is completely sealed from the outside.

However, a gap (G) is generated due to the assembly tolerance between the guide panel 130 and the top cover 140, and heat and moisture from the outside are introduced into the modularized liquid crystal display device through the gap (G). .

At this time, the polarizing plates 119a and 119b attached to the front and rear surfaces of the liquid crystal panel 110 are damaged by the heat and moisture introduced from the outside, or the optical sheet 121 of the backlight unit 120 moves. will make it

Accordingly, a non-uniformity phenomenon appears in an image due to a difference in luminance, which causes a problem of deterioration of the display quality of the liquid crystal display device. In addition, deterioration and corrosion of the LED 129a of the backlight unit 120 is caused by heat and moisture introduced from the outside, thereby reducing the luminous efficiency of the LED 129a or shortening the lifespan of the LED 129a.

However, in the liquid crystal display according to the first embodiment of the present invention, even if heat and moisture are introduced into the modular liquid crystal display from the outside due to the gap G generated between the top cover 140 and the guide panel 130, Liquid crystal in which heat and moisture are modularized by the foam pad 200 positioned between the inner surface of the first horizontal portion 143 of the top cover 140 and the upper surface of the third vertical portion 135 of the guide panel 130 The passage leading into the display device is blocked.

Therefore, it is possible to block the inflow of heat and moisture from the outside of the modular liquid crystal display into the inside of the modular liquid crystal display, and the polarizing plates ( It is possible to prevent 119a and 119b from being damaged or the optical sheet 121 of the backlight unit 120 from moving.

Accordingly, it is possible to prevent deterioration of the display quality of the liquid crystal display device.

In addition, the LED 129a of the backlight unit 120, which is vulnerable to heat and moisture, is also not exposed to heat and moisture introduced from the outside, so that the luminous efficiency of the LED 129a is reduced or the life of the LED 129a is shortened. can do.

Here, the foam pad 200 interposed between the inner surface of the first horizontal portion 143 of the top cover 140 and the upper surface of the third vertical portion 135 of the guide panel 130 is a base layer. and a cushion foam layer, wherein the base layer is made of a polyethylene series containing terephthalic acid having good dimensional stability such as polyethyleneterephthalate (PET).

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

The cushion foam layer is made of a poron or urethane material, and serves to absorb shock. This cushion foam layer absorbs a predetermined pressure applied when a predetermined pressure is applied to the foam pad 200. .

The foam pad 200 has a high modulus of elasticity by such a cushion foam layer.

The foam pad 200 blocks the passage of heat and moisture flowing in from the outside, and in the process of assembling and fastening the top cover 140 and the guide panel 130 , by the high modulus of elasticity of the foam pad 200 . The top cover 140 and the guide panel 130 can be easily assembled and fastened.

As described above, in the liquid crystal display according to the first embodiment of the present invention, the foam pad is disposed between the inner surface of the first horizontal surface 143 of the top cover 140 and the upper surface of the third vertical portion 135 of the guide panel 130 . By positioning 200 , it is possible to prevent heat and moisture from flowing into the modular liquid crystal display from the outside of the modular liquid crystal display.

Accordingly, the polarizing plates 119a and 119b attached to the front and rear surfaces of the liquid crystal panel 110 are damaged by the heat and moisture introduced from the outside, or the optical sheet 121 of the backlight unit 120 moves. can be prevented from doing

Through this, it is possible to prevent deterioration of the display quality of the liquid crystal display device, deterioration of the luminous efficiency of the LED 129a, or shortening of the lifespan of the LED 129a.

And, in the process of assembling and fastening the top cover 140 and the guide panel 130 , the top cover 140 and the guide panel 130 can be easily assembled and fastened by the high modulus of elasticity of the foam pad 200 . .

- Second embodiment -

4 is a cross-sectional view schematically illustrating a modularized liquid crystal display according to a second embodiment of the present invention.

As shown, the LED assembly 129 and the light guide plate 123 are formed on the upper part of the LED assembly 129 and the light guide plate 123 including the reflecting plate 125, the light guide plate 123, the LED 129a and the PCB 129b on which the LED 129a is mounted. 121) are stacked to form the backlight unit 120 .

In addition, the first and second substrates 112 and 114 and the liquid crystal panel 110 having a liquid crystal layer (not shown) interposed therebetween are positioned on the backlight unit 120 , and the first and second substrates 112 . , 114), polarizing plates 119a and 119b that selectively transmit only a specific light are attached to the outer surface of each.

The backlight unit 120 and the liquid crystal panel 110 have an edge surrounded by a guide panel 130 , and a cover bottom 150 is coupled to the rear surface thereof, and a top surrounding the upper surface edge and the side surface of the liquid crystal panel 110 . The cover 140 is coupled to the guide panel 130 and the cover bottom 150 .

Here, the guide panel 130 according to the second embodiment of the present invention includes a second vertical portion 131 surrounding the side surface of the backlight unit 120 , and the liquid crystal panel 110 inside the second vertical portion 131 . and a second horizontal part 133 that separates the positions of the backlight unit 120 and the second horizontal part 133 on the second horizontal part 133 to vertically protrude from the second horizontal part 133 to form a side surface of the liquid crystal panel 110 . A third vertical portion 135 surrounding the is configured.

The liquid crystal panel 110 is attached and fixed on the second horizontal portion 133 through an adhesive pad (not shown) such as a double-sided tape, and the side surface is guided through the third vertical portion 135 .

Accordingly, the side of the backlight unit 120 is guided through the second vertical portion 131 of the guide panel 130 , and the liquid crystal panel 110 moves toward the inside of the second vertical portion 131 of the guide panel 130 . It is seated and supported on the protruding second horizontal portion 133 through an adhesive pad (not shown) such as a double-sided tape, and the side surface of the liquid crystal panel 110 is guided through the third vertical portion 135 .

At this time, the upper surface of the third vertical part 135 is formed to be completely in close contact with the inner surface of the first horizontal part 143 of the top cover 140 , and the upper surface of the third vertical part 135 has a third vertical It is characterized in that the step 137 is formed on the outside of the part 135 .

And, the foam pad 200 is interposed between the inner surface of the first horizontal portion 143 of the top cover 140 and the upper surface of the third vertical portion 135 of the guide panel 130, the foam pad 200. is seated on the step 137 formed on the upper surface of the third vertical part 135 of the guide panel 130, and is positioned between the step 137 and the inner surface of the first horizontal part 143 of the top cover 140 will do

Here, the foam pad 200 interposed between the inner surface of the first horizontal portion 143 of the top cover 140 and the step 137 of the third vertical portion 135 of the guide panel 130 is a base layer ( a base layer) and a cushion foam layer. The base layer is made of a polyethylene series containing terephthalic acid having good dimensional stability, such as polyethyleneterephthalate (PET).

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

The cushion foam layer is made of a poron or urethane material, and serves to absorb shock. This cushion foam layer absorbs a predetermined pressure applied when a predetermined pressure is applied to the foam pad 200. .

The foam pad 200 has a high modulus of elasticity by such a cushion foam layer.

In the liquid crystal display according to the second embodiment of the present invention, even if heat and moisture are introduced from the outside due to the gap G between the guide panel 130 and the top cover 140 , the step 137 of the guide panel 130 is ), a passage through which heat and moisture flow into the modular liquid crystal display device is primarily blocked by the foam pad 200 seated on the surface.

And, the heat and moisture that have penetrated into the foam pad 200 in the process of first blocking the passage through which heat and moisture are introduced is the upper surface of the third vertical part 135 of the guide panel 130 and the top cover 140 of the As the inner surfaces of the first horizontal portion 143 are positioned in close contact with each other, the passage flowing into the secondly modularized liquid crystal display device is blocked.

Accordingly, the liquid crystal display according to the second embodiment of the present invention can block the inflow of heat and moisture from the outside of the modular liquid crystal display into the inside of the modular liquid crystal display over a second time, It is possible to prevent the polarizing plates 119a and 119b attached to the front and rear surfaces of the liquid crystal panel 110 from being damaged by moisture or the optical sheet 121 of the backlight unit 120 from moving.

Accordingly, it is possible to prevent deterioration of the display quality of the liquid crystal display device.

In addition, since the LED 129a is not exposed by the heat and moisture flowing in from the outside, it is possible to prevent the luminous efficiency of the LED 129a from being lowered or the lifetime of the LED 129a from being shortened.

And, in the process of assembling and fastening the top cover 140 and the guide panel 130 , the inner surface of the first horizontal part 143 of the top cover 140 and the third vertical part 135 of the guide panel 130 . ), even if a separate gap for assembly tolerance does not occur between the upper surfaces, the top cover 140 and the guide panel 130 can be easily assembled and fastened by the high modulus of elasticity of the foam pad 200 .

5A to 5B are pictures showing a liquid crystal display device without a foam pad, and FIGS. 6A to 6B are pictures showing a liquid crystal display device in which a foam pad is positioned between a top cover and a guide panel according to a second embodiment of the present invention. to be.

Referring to FIG. 5A , in the liquid crystal display device without a foam pad, it can be seen that moisture penetrates into the modular liquid crystal display device, but as shown in FIG. 6A , as in the second embodiment of the present invention, the top cover ( In the liquid crystal display device in which the foam pad (200 in FIG. 4 ) is positioned between 140 in FIG. 4 and the guide panel 130 in FIG. 4 , it can be confirmed that moisture does not penetrate into the modular liquid crystal display device.

And, referring to FIG. 5B , it can be seen that a bluesh phenomenon occurs in the liquid crystal display device not provided with a foam pad. The bluesh phenomenon may be caused by damage to the polarizing plates attached to the front and rear of the liquid crystal panel. As a phenomenon that occurs in this case, it can be confirmed that the polarizing plates attached to the front and rear of the liquid crystal panel are damaged by the heat and moisture flowing in from the outside in the liquid crystal display device without the foam pad.

On the other hand, referring to FIG. 6B , as in the second embodiment of the present invention, a liquid crystal display device in which a foam pad (200 in FIG. 4 ) is positioned between the top cover ( 140 in FIG. 4 ) and the guide panel ( 130 in FIG. 4 ). can confirm that the blueish phenomenon does not occur, through which the liquid crystal display device of the present invention does not penetrate into the modularized liquid crystal display device, heat and moisture do not penetrate to the front and rear of the liquid crystal panel (110 in FIG. 4) It can be confirmed that the polarizing plates 119a and 119b in FIG. 4 are not damaged.

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.

110: liquid crystal panel (112, 114: first and second substrates)
119a, 119b: first and second polarizing plates
120: backlight unit (121: optical sheet, 123: light guide plate, 125: reflector, 129: LED assembly (129a: LED, 129b: PCB)))
130: guide panel (131: second vertical part, 133: second horizontal part, 135: third vertical part)
140: top cover (141: first vertical part, 143: first horizontal part)
150: cover bottom (151: horizontal plane, 153: fourth vertical part)
200: foam pad

Claims (6)

a liquid crystal panel;
a backlight unit positioned under the liquid crystal panel;
a top cover positioned on the upper portion of the liquid crystal panel and including a first vertical portion covering a side surface of the liquid crystal panel and a first horizontal portion covering an upper edge of the liquid crystal panel;
A second vertical portion surrounding the side surface of the backlight unit, a second horizontal portion supporting the liquid crystal panel vertically from the second vertical portion, and a second vertical portion protruding vertically from the second horizontal portion to surround the side surface of the liquid crystal panel 3 and a guide panel including a vertical part;
a cover bottom on which the backlight unit is seated;
It is positioned between the top cover and the guide panel, and has a rectangular frame shape.
includes,
A step is provided on the upper surface of the third vertical part to the outside of the third vertical part facing the first vertical part, the foam pad is seated on the step, and the inner surface of the first horizontal part is the third vertical part It is in close contact with the upper surface and the foam pad at the same time,
The third vertical portion protrudes vertically from the center of the second horizontal portion,
One edge of the second horizontal portion with respect to the third vertical portion supports the rear edge of the liquid crystal panel,
The other edge of the second horizontal portion is positioned to face the foam pad.
The method of claim 1,
The cover bottom includes a horizontal plane on which the backlight unit is seated, and a fourth vertical part vertically bent from the horizontal plane,
An outer surface of the fourth vertical part is positioned to face an inner surface of the second vertical part, and an outer surface of the second vertical part is positioned to face an inner surface of the first vertical part.
delete The method of claim 1,
Polarizing plates are attached to the front and rear surfaces of the liquid crystal panel, respectively,
The polarizing plate attached to the rear surface of the liquid crystal panel exposes the rear edge of the first substrate of the liquid crystal panel, and the upper surface of the one edge of the second horizontal part faces the rear edge of the first substrate exposed by the polarizing plate. located in the liquid crystal display.
The method of claim 1,
The backlight unit includes a light guide plate, an LED assembly positioned along a light incident surface of the light guide plate, a reflector positioned below the light guide plate, and an optical sheet positioned above the light guide plate,
The optical sheet exposes an edge of the upper surface of the light guide plate,
On the light-incoming surface opposite to the light incident surface, the lower surface of the one edge of the second horizontal part is positioned to face the upper edge of the light guide plate exposed by the optical sheet.
The method of claim 1,
A liquid crystal display device in which a touch panel is positioned above the top cover.

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