KR101995776B1 - Liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device capable of improving the grounding force of an FPC.
The liquid crystal display device of the present invention is characterized in that an FPC for grounding is formed on an FPC and a ground portion is provided on a cover bottom corresponding to the grounding FPC.
Therefore, the side face of the cover bottom and the grounding force of the FPC for grounding are improved, so that the electromagnetic waves and the static electricity generated from the FPC are more efficiently discharged to the outside.
This can prevent the occurrence of problems such as interference of an electric signal transmitted to the liquid crystal panel due to electromagnetic waves or static electricity, malfunction of other peripheral devices, and the like.
In addition, the electrification tape can be eliminated, and the efficiency of the process and the reliability of the product can be improved.

Description

[0001] Liquid crystal display device [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device capable of improving the grounding force of an FPC.

2. Description of the Related Art In recent years, the display field has rapidly developed in line with the information age. In response to this trend, a flat panel display device (FPD) having a thinness, light weight, A plasma display panel (PDP), an electroluminescence display device (ELD), and a field emission display device (FED) : CRT).

Among these, liquid crystal display devices are excellent in moving picture display and are most actively used in the fields of notebook computers, monitors, TVs and the like due to their high contrast ratios.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight having a light source is disposed on the back surface of the liquid crystal panel.

The liquid crystal panel and the backlight are modularized integrally with the support main through the top cover covering the top edge of the liquid crystal panel and the cover bottom covering the back surface of the backlight in a state where the edge is surrounded by the support main of a square- .

On the other hand, in recent years, such a liquid crystal display device has been widely used as a portable computer, a desktop computer monitor, and a wall-mounted television, and researches to have a massive weight and volume with a large display area It is actively proceeding.

To this end, the driving elements for generating driving and control signals of the liquid crystal panel are mounted on a flexible printed circuit board (FPC) having a flexible characteristic so that the FPC is bent and positioned on the back surface of the liquid crystal panel , A light weight due to the elimination of the printed circuit board and a thin shape of the liquid crystal display device.

On the other hand, since most of the driving elements mounted on the FPC are operated by a high frequency signal, electro magnetic interference (EMI) and electrostatic discharge (ESD) are generated.

Such electromagnetic waves or static electricity not only cause interference with an electric signal transmitted to the liquid crystal panel but also emitted outside the liquid crystal display device, thereby causing malfunction of other peripheral devices.

In order to solve such a problem, a method of grounding the FPC and the cover bottom of a metal material through a conductive tape is used. However, this effect is not significant. As the conductive tape is attached by a manual operation of the operator, Which is not easy and causes a problem that the workability and the productivity are remarkably lowered due to a large defect ratio.

This reduces the reliability of the product.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a liquid crystal display device capable of removing unnecessary signal components such as electromagnetic waves and static electricity generated from an FPC through a more efficient grounding method.

The second objective is to improve process efficiency and product reliability.

In order to achieve the above-mentioned object, the present invention provides a liquid crystal display comprising: a reflection plate; A light guide plate disposed on the reflection plate; An optical sheet that is seated on the light guide plate; A liquid crystal panel comprising a first substrate and a second substrate which are seated on the optical sheet and are bonded to each other with a liquid crystal layer interposed therebetween; A flexible printed circuit (FPC) connected to one side of the first substrate and having a plurality of LEDs mounted thereon and bent to the back surface of the liquid crystal panel so that the plurality of LEDs face the light incident side of the light guide plate; A ground FPC formed on one side of the FPC and bent from the FPC so as to surround the side surface of the first substrate; Wherein the reflection plate, the light guide plate, the optical sheet, the horizontal plane on which the liquid crystal panel is mounted, and the side surface perpendicular to the horizontal plane, and the grounding portion for pressing the grounding FPC at a position corresponding to the grounding FPC A liquid crystal display device including a cover bottom of a material is provided.

At this time, the ground portion is formed to project convexly from the corner between the horizontal surface and the side surface toward the inside of the cover bottom, and the ground portion is protruded from the side surface to the inside of the cover bottom.

The ground portion is composed of a double surface which is formed by an inner side surface extending from the side surface and a part of the side surface and folded inward to the inside of the side surface to have a general shape bent in a U shape, The area in contact with the grounding FPC is rounded.

At this time, the first substrate corresponding to the grounding portion is formed with a concave groove inward of the first substrate, and the bent end portion is bent at the end of the inner side toward the inside of the cover bottom.

In addition, the first substrate corresponding to the bent portion is formed with a concave groove inward of the first substrate, the grounding FPC extends from the FPC, and the grounding FPC includes a coverlay And the ground pad is exposed to the outside.

As described above, in the liquid crystal display of the present invention, the grounding FPC is formed on the FPC and the cover bottom has the grounding portion corresponding to the grounding FPC, so that the side surface of the cover bottom and the grounding force of the grounding FPC are improved, There is an effect that the electromagnetic wave or static electricity generated from the FPC is more efficiently discharged to the outside.

As a result, it is possible to prevent the occurrence of problems such as interference of an electric signal transmitted to the liquid crystal panel due to electromagnetic waves or static electricity, malfunction of other peripheral devices, and the like.

Further, since the energizing tape can be eliminated, the efficiency of the process and the reliability of the product can be improved.

1 is an exploded perspective view schematically showing a liquid crystal display device according to an embodiment of the present invention.
FIG. 2A is an enlarged perspective view of a liquid crystal panel of a liquid crystal display device according to an embodiment of the present invention; FIG.
FIG. 2B is an enlarged view of FIG. 2A. FIG.
FIG. 3A is a perspective view schematically showing a ground portion according to the first embodiment of the present invention; FIG.
3B to 3C are a perspective view and a cross-sectional view schematically showing the grounding of the grounding portion of the FPC and the cover bottom of the FPC.
4A is a perspective view schematically showing a ground portion according to a second embodiment of the present invention.
FIG. 4B is a cross-sectional view schematically showing the grounding of the grounding portion of the FPC and the cover bottom of the FPC. FIG.
5A is a perspective view schematically showing a grounding portion according to a third embodiment of the present invention.
5B is a cross-sectional view schematically showing the grounding of the FPC for grounding of the FPC and the grounding portion of the cover bottom.
FIGS. 6A to 6D are graphs showing experimental results obtained by measuring the resistance values on the FPC of the structure in which the ground portion of the cover bottom is omitted and the ground portion of the cover bottom according to the first to third embodiments of the present invention.

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

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

The liquid crystal display device includes a liquid crystal panel 110 and a backlight unit 120 and includes a support main body 130 and a cover bottom 150 for modularizing the liquid crystal panel 110 and the backlight unit 120, And a top cover 140.

Here, the liquid crystal panel 110 includes a first substrate 112 and a second substrate 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

At this time, a flexible printed circuit (FPC) 160 is attached to one side of the liquid crystal panel 110 via an anisotropic conductive film (not shown) to output various signal voltages.

A plurality of wiring patterns (not shown) and driving elements 170 are aligned on the rear surface of the FPC 160 and a plurality of LEDs 126 are mounted on one edge of the FPC 160 at a predetermined interval.

One end of the FPC 160 is formed with a cable FPC 180 having a part of the FPC 160 extended so as to be electrically connected to an external driving circuit (not shown). In particular, 160 are further provided with a grounding FPC 190 for grounding the FPC 160.

The grounding FPC 190 is brought into contact with the side surface of the cover bottom 150 made of a metal so that unnecessary signals such as electro magnetic interference (EMI) generated from the FPC 160 and electrostatic discharge (ESD) The component can be discharged to the outside more efficiently.

Accordingly, it is possible to prevent the occurrence of problems such as interference of an electric signal transmitted to the liquid crystal panel 110 due to electromagnetic waves or static electricity, malfunction of other peripheral devices, and the like. Let me take a closer look at this later.

The FPC 160 is folded back to the back surface of the liquid crystal panel 110 in the modularization process of the liquid crystal display device so that a plurality of LEDs 126 mounted on the FPC 160 are disposed on the back surface of the liquid crystal panel 110, Facing the light incidence surface of the light guide plate 123 of the light guide plate 120.

That is, in the liquid crystal display device according to the present invention, the backlight unit 120 for supplying light to the rear surface of the liquid crystal panel 110 is provided so that the difference in transmittance of the liquid crystal panel 110 is manifested to the outside.

The backlight unit 120 includes a plurality of LEDs 126 mounted on the FPC 160, a white or silver reflective plate 125, a light guide plate 123 seated on the reflective plate 125, And an optical sheet 121 which is made of glass.

As described above, the plurality of LEDs 126 are mounted on the FPC 160, which is folded back to the back surface of the liquid crystal panel 110. In this case, the FPC 160 includes a plurality of LEDs 126, And is bent so as to face the light incidence surface of the light guide plate 123.

Accordingly, the plurality of LEDs 126 are positioned on one side of the light guide plate 123 so as to face the light incident side of the light guide plate 123.

The plurality of LEDs 126 emit white light toward the light incoming surface of the light guide plate 123, including an LED chip (not shown) that emits RGB colors or emits white light. The plurality of LEDs 126 emit light having colors of red (R), green (G), and blue (B), respectively, and by turning on the plurality of RGB LEDs 126 at a time, white light It can also be implemented.

The light guide plate 123 on which the light emitted from the plurality of LEDs 126 is incident is illuminated by the light incident from the LED 126 through the light guide plate 123 by total reflection several times, And provides a surface light source to the liquid crystal panel 110.

The light guide plate 123 may include a pattern of a specific shape on the back surface to supply a uniform surface light source.

Here, the pattern may be formed in various shapes such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like in order to guide 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 reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects light passing through the back surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of light.

The optical sheet 121 on the light guide plate 123 includes a diffusion sheet and at least one light condensing sheet and diffuses or condenses the light passing through the light guide plate 123 to provide a more uniform surface light source to the liquid crystal panel 110 Let it enter.

The liquid crystal panel 110 and the backlight unit 120 are modularized through a top cover 140, a support main 130 and a cover bottom 150. The top cover 140 is disposed on the upper surface and the side surface of the liquid crystal panel 110, The top cover 140 is opened so that an image formed on the liquid crystal panel 110 is displayed.

The cover bottom 150 on which the liquid crystal panel 110 and the backlight unit 120 are mounted and which is the basis for assembling the entire apparatus of the liquid crystal display apparatus 100 includes a horizontal surface 151 closely contacting the back surface of the backlight unit 120, And a side surface 153 whose edge is vertically bent upward.

The cover bottom 150 is further provided with a grounding portion 155 (see FIG. 3A) corresponding to the grounding FPC 190 of the FPC 160. The grounding force of the grounding FPC 190 of the FPC 160 with the cover bottom 150 is improved through the grounding part 155 (see FIG. 3A) formed in the cover bottom 150, So that the generated electromagnetic waves and static electricity are more efficiently discharged to the outside.

Here, the grounding portion 155 (see FIG. 3A) of the cover bottom 150 may have various shapes such as a convex shape inside the cover bottom 150 or a side surface 153 is subjected to a hemming process I will look into this in more detail later.

The support main body 130 having a rectangular frame shape and resting on the cover bottom 150 and covering the edges of the liquid crystal panel 110 and the backlight unit 120 includes a top cover 140, a cover bottom 150, .

The cover main body 130 may be referred to as a guide panel or a main support or a mold frame. The cover main body 130 may be referred to as a bottom cover or a bottom cover, I will.

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

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

As described above, the liquid crystal display device of the present invention further includes a grounding FPC 190 on one side of the FPC 160, and ground portions 155 and 155 are formed on the cover bottom 150 corresponding to the grounding FPC 190, The grounding FPC 190 of the FPC 160 improves the contact force with the cover bottom 150 so that the electromagnetic waves and static electricity generated from the FPC 160 can be efficiently transmitted to the outside And discharges.

Accordingly, it is possible to prevent the occurrence of problems such as interference of an electric signal transmitted to the liquid crystal panel 110 due to electromagnetic waves or static electricity, malfunction of other peripheral devices, and the like.

Further, it is possible to eliminate the electrification tape (not shown), so that the efficiency of the process and the reliability of the product can be improved.

FIG. 2A is a perspective view showing an enlarged view of a liquid crystal panel of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2B is an enlarged view of FIG. 2A.

As shown in the drawing, the liquid crystal panel 110 is a part that plays a key role in image display of the liquid crystal display device, and includes a first substrate 112 and a second substrate 114, And a liquid crystal layer (not shown).

Although not shown in the drawing, a plurality of gate lines and data lines intersect each other on the inner surface of a first substrate 112 called a lower substrate or an array substrate, pixels are defined, and thin- and a thin film transistor (TFT), which are connected in a one-to-one correspondence with the transparent pixel electrodes formed in the respective pixels.

On the inner surface of the second substrate 114 called an upper substrate or a color filter substrate, color filters of red (R), green (G), and blue (B) And a black matrix for covering the gate lines, the data lines, and the thin film transistors.

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

A polarizing plate (not shown) for selectively transmitting only specific light is attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

At this time, the first substrate 112 is further provided with a pad region as compared with the second substrate 114, so that the area of one edge is larger. Therefore, a drive circuit 115 for applying a signal to a plurality of gate lines and data lines is formed as a pad region at one edge of the first substrate 112.

This structure is referred to as a COG (Chip on Glass) type liquid crystal panel 110. In the COG method, an anisotropic conductive film (not shown) is used to mount the driving circuit 115 on the first substrate 112 It has an advantage that the proportion of the liquid crystal panel 110 occupied by the liquid crystal display device can be increased.

The driving circuit 115 is connected to a plurality of gates and a data driving circuit, and each gate and data driving circuit 115 is connected to a gate and a data line (not shown) on the first substrate 112, respectively.

The gate and data driver circuit 115 is connected to a flexible printed circuit (FPC) 160 that outputs various signal voltages. A plurality of wiring patterns (not shown) connected to the data and gate driving circuit 115 (Not shown) and driving elements (170 in Fig. 1) are aligned.

A plurality of LEDs (126 in FIG. 1) are mounted at a predetermined interval on one edge of a driving element (150 in FIG. 1) of the FPC 160 of the present invention. (Not shown) so that a part of the FPC 160 extends to form an FPC 180 for a cable.

The FPC 160 of the present invention is further provided with a grounding FPC 190 for grounding the FPC 160.

The FPC 160 is folded back to the back surface of the liquid crystal panel 110 in the process of modulating the liquid crystal display device so that a plurality of LEDs (126 in FIG. 1) mounted on the FPC 160 are mounted on the back surface of the liquid crystal panel 110 And faces the light incidence surface of the light guide plate (123 in Fig. 1) of the backlight unit (120 in Fig. 1) positioned.

At this time, the FPC 160 includes a base film having flexibility, a plurality of wiring patterns formed by patterning a conductive material on an upper portion of the base film, and a coverlay Respectively.

A ground pad 191 is formed on the same layer as the wiring pattern on the grounding FPC 190 of the FPC 160. The cover layer is removed on the ground pad 191 so that the ground pad 191 is exposed to the outside .

The grounding FPC 190 of the FPC 160 protrudes from one edge of the FPC 160 facing the liquid crystal panel 110 and when the FPC 160 is bent toward the back surface of the liquid crystal panel 110, The first substrate 190 is bent so as to cover the side surface of the first substrate 112 of the liquid crystal panel 110 so that the ground pads 191 are exposed to the outside.

1) 153 of the cover bottom (150 in FIG. 1) and the ground pad 191 of the FPC 190 for grounding are formed in the process of modularizing the liquid crystal panel 110 So that the electromagnetic waves and the static electricity generated from the FPC 160 are discharged to the outside through the cover bottom (150 in FIG. 1).

The cover bottom (150 in FIG. 1) is further provided with a ground portion 155 (see FIG. 3A) corresponding to the ground FPC 190 so that the ground FPC 190 and the cover bottom (153 in Fig. 1) of the FPC 160 is more efficiently grounded, thereby discharging electromagnetic waves and static electricity generated from the FPC 160 to the outside more efficiently.

3A and 3B are a perspective view and a cross-sectional view, respectively, schematically showing the grounding of the grounding portion of the FPC and the cover bottom of the FPC. FIG. 3A is a perspective view schematically illustrating the grounding portion according to the first embodiment of the present invention.

1, the cover bottom 150 includes a horizontal surface 151 closely contacting the back surface of the backlight unit 120 (see FIG. 1) and a side surface 153 vertically upwardly bent at an edge thereof. At this time, A grounding portion 155 protruding inward from the cover bottom 150 is formed at a corner between the horizontal surface 151 and the side surface 153 of the cover bottom 150 corresponding to the position of the grounding FPC 190 of the cover bottom 150 .

The grounding portion 155 serves to press the grounding FPC 190 of the FPC 160 so that the grounding FPC 190 of the FPC 160 and the side surface 153 of the cover bottom 150 are better To ground.

The length d1 of the grounding part 155 is preferably the same as the length d2 of the grounding FPC 190 and the degree of convexity of the grounding part 155 is equal to the length d2 of the grounding FPC 190. [ Is not particularly limited within a range that does not exceed the height of the side surface 153 and can press the grounding FPC 190 of the FPC 160. [

The grounding part 155 has a large contact area with the FPC 190 for grounding, and in order to prevent disconnection of the grounding FPC 190, a region in contact with the grounding FPC 190 is subjected to a rounding process .

An area corresponding to the lower side edge of the first substrate 112 of the liquid crystal panel 110 to which the FPC 160 is connected, that is, the grounding part 155 of the cover bottom 150, It is preferable that the recessed groove 112a is formed so that the ground pad 191 of the grounding FPC 190 is grounded with the grounding portion 155 in a wider area.

The grounding FPC 190 is pressed through the grounding portion 155 of the cover bottom 150 so that the grounding FPC 190 and the side surface 153 of the cover bottom 150 are more efficiently grounded and the FPC 190 So that the electromagnetic waves and the static electricity generated from the electrodes 160 and 160 are more efficiently discharged to the outside.

FIG. 4A is a perspective view schematically showing a grounding part according to a second embodiment of the present invention, and FIG. 4B is a sectional view schematically showing a grounding state of the grounding part of the FPC and the cover bottom of the FPC.

1, the cover bottom 150 includes a horizontal surface 151 closely contacting the back surface of the backlight unit 120 (see FIG. 1) and a side surface 153 vertically upwardly bent at an edge thereof. At this time, A ground portion 157 is formed on the side surface 153 of the cover bottom 150 so as to protrude toward the inside of the cover bottom 150 corresponding to the position of the ground FPC 190 of the cover bottom 150.

The grounding part 157 serves to press the grounding FPC 190 of the FPC 160 so that the grounding FPC 190 of the FPC 160 and the side surface 153 of the cover To ground.

The size of the grounding portion 157 may be any size that can press the grounding FPC 190 within a range not exceeding the height of the side surface 153 of the cover bottom 150, The height projected from the side surface 153 of the grounding FPC 190 is not particularly limited as long as the grounding FPC 190 can be pressed.

The grounding portion 157 has a large contact area with the FPC 190 for grounding, and in order to prevent disconnection of the grounding FPC 190, a region in contact with the grounding FPC 190 is subjected to a rounding process .

An area of the first substrate 112 of the liquid crystal panel 110 of FIG. 4B to which the FPC 160 is connected, that is, the area corresponding to the grounding part 157 of the cover bottom 150, The ground pad 191 of the FPC 190 for grounding is grounded with the grounding portion 157 so as to have a larger area, and at the same time, it is preferable to prevent the bezel from spreading.

The grounding FPC 190 is pressed through the grounding portion 157 of the cover bottom 150 so that the side surfaces of the grounding FPC 190 and the cover bottom 150 are more efficiently grounded, So that the generated electromagnetic waves and static electricity are more efficiently discharged to the outside.

FIG. 5A is a perspective view schematically showing a grounding part according to a third embodiment of the present invention, and FIG. 5B is a sectional view schematically showing a grounding state of the grounding part of the FPC and the cover bottom of the FPC.

1, the cover bottom 150 includes a horizontal surface 151 closely contacting the back surface of the backlight unit 120 (see FIG. 1) and a side surface 153 vertically upwardly bent at an edge thereof. At this time, A portion of the side surface 153 of the cover bottom 150 corresponding to the position of the FPC 190 for grounding is formed by the inner-hemming process.

That is, the grounding portion 159 of the cover bottom 150 has a side 153 of the cover bottom 150 that is vertically bent from the horizontal surface 151 and a side 153 extending from the side 153 And an inner side surface 159a that is completely folded and folded inward of the inner side surface 159a, and the overall shape is folded in a "U" shape to form a double surface.

Hemming is a process of folding the end of a sheet by folding it. By this process, the rigidity of the product can be increased to suppress warpage, to enhance the appearance, and to eliminate sharp edges.

At this time, the cover bottom 150 of the present invention is characterized in that the end of the inner side surface 159a is formed as a bent portion 159b that is bent perpendicularly to the inner side surface 159a toward the inside of the cover bottom 150 .

 The grounding portion 159 serves to press the grounding FPC 190 of the FPC 160. Particularly, the bending portion 159b further presses the grounding FPC 190, So that the FPC 190 and the side faces 153 of the cover bottom 150 are better grounded.

The grounding portion 159 has a wide contact area with the FPC 190 for grounding, and in order to prevent disconnection of the FPC 190 for grounding, a region in contact with the grounding FPC 190 is rounded .

An area corresponding to the lower side edge of the first substrate 112 of the liquid crystal panel (110 of FIG. 4B) to which the FPC 160 is connected, that is, the bent portion 159b of the cover bottom 150, 112 are formed so that the ground pad 191 of the grounding FPC 190 is grounded with a larger area than the grounding portion 159 and at the same time the non-light emitting region of the liquid crystal display device It is desirable to prevent the bezel from spreading.

The grounding FPC 190 is pressed through the grounding portion 159 of the cover bottom 150 so that the grounding FPC 190 and the side surface 153 of the cover bottom 150 are more efficiently grounded and the FPC 190 So that the electromagnetic waves and the static electricity generated from the electrodes 160 and 160 are more efficiently discharged to the outside.

6A to 6D are graphs showing experimental results of measuring the resistance values of the cover bottom and the FPC of the structure in which the ground portion of the cover bottom is omitted and the ground portion of the cover bottom according to the first to third embodiments of the present invention.

6A to 6D are experimental results of measuring the resistance values of the cover bottom and the FPC simultaneously using 30 samples, respectively. The lower the resistance value, the better the grounding force.

5B) of the cover bottom (150 in FIG. 5B) is omitted. In the process of modularizing the liquid crystal panel (110 in FIG. 4B), the grounding FPC 5B) of the liquid crystal panel (110 of FIG. 4B) so as to cover the sides of the cover bottom (150 of FIG. 5B) (153 of FIG. 5B) and the grounding FPC (191 in FIG. 5B) were grounded to each other, and the resistances of arbitrary points of the FPC were measured. As a result, it can be confirmed that the resistance value of a plurality of samples is 0.8 OMEGA.

In particular, it is desirable that the resistance value should not exceed 1.0?. It can be seen that Fig. 6a shows that there are many samples whose resistance value exceeds 1.0 ?.

If the resistance value exceeds 1.0 ?, interference of an electric signal transmitted to the liquid crystal panel (110 in FIG. 3B) occurs due to electromagnetic waves or static electricity generated from the FPC (160 in FIG. 5B) or malfunction of other peripheral devices And the like.

On the other hand, FIG. 6B shows a cover bottom (150 in FIG. 5B) at an edge between a horizontal surface (151 in FIG. 5B) and a side surface (155 of FIG. 4C) protruding inward from the inner side of the protruding portion (the protruding portion 155 of FIG. 4C) is formed, and the resistance value of a plurality of samples is 0.5 ?, which is lower than that of FIG. 6A.

Fig. 6C is a side view (153 in Fig. 5B) of the cover bottom (150 in Fig. 5B) according to the second embodiment of the present invention and a ground portion 157 of FIG. 4B) is formed, and it can be seen that the resistance value of a plurality of samples is lower than that of FIG. 6A by 0.4 ?.

6D is a side view (153 in FIG. 5B) of the cover bottom (150 in FIG. 5B) according to the third embodiment of the present invention is subjected to inner-hemming treatment so that the ground portion (159 in FIG. With the formed structure, it can be seen that the resistance value of a plurality of samples is about 0.5?, Which is also lower than that of Fig. 6A.

That is, according to the first to third embodiments of the present invention, the cover bottom (150 in FIG. 5B) corresponds to the ground FPC (190 in FIG. 5B) of the FPC , 157 of FIG. 4B, and 159 of FIG. 5B), the resistance value of the FPC (160 of FIG. 5B) becomes lower than that of the case where the ground portion (159 of FIG. 5B) is not formed .

5B) 160 according to the first to third embodiments of the present invention can more effectively ground the FPC (160 in FIG. 5B), so that the electromagnetic wave generated from the FPC (160 in FIG. 5B) And discharge the static electricity to the outside more efficiently.

As described above, the liquid crystal display of the present invention forms a grounding FPC (190 in FIG. 5B) on the FPC (160 in FIG. 5B) (159 in Fig. 5B) and the grounding FPC (190 in Fig. 5B) can be improved by providing the grounding portion (159 in Fig. 5B) The electromagnetic waves and static electricity generated from 160 of FIG. 5B are more efficiently discharged to the outside.

This can prevent the occurrence of problems such as interference of an electric signal transmitted to the liquid crystal panel (110 of FIG. 3B) due to electromagnetic waves or static electricity, and malfunction of other peripheral devices.

Further, it is possible to eliminate the electrification tape (not shown), so that the efficiency of the process and the reliability of the product can be improved.

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

112: a first substrate (112a: groove)
151: horizontal plane, 155: side
155:
160: FPC
190: FPC for grounding (191: grounding pad)

Claims (9)

A reflector;
A light guide plate disposed on the reflection plate;
An optical sheet that is seated on the light guide plate;
A liquid crystal panel comprising a first substrate and a second substrate which are seated on the optical sheet and are bonded to each other with a liquid crystal layer interposed therebetween;
A flexible printed circuit (FPC) connected at one edge to one side of the first substrate and having a plurality of LEDs mounted thereon and bent to the backside of the liquid crystal panel so that the plurality of LEDs face the light incident side of the light guide plate;
A grounding FPC protruding from the one edge of the FPC and bent from the FPC to surround a side surface of the first substrate;
Wherein the reflection plate, the light guide plate, the optical sheet, the horizontal plane on which the liquid crystal panel is mounted, and the side surface perpendicular to the horizontal plane, and the grounding portion for pressing the grounding FPC at a position corresponding to the grounding FPC Cover of material
/ RTI >
The grounding pad is exposed to the outside,
Wherein the ground portion is protruded toward the inside of the cover bottom, and the ground portion is in close contact with the ground pad.
The method according to claim 1,
Wherein the ground portion is formed so as to be convexly protruded from an edge between the horizontal surface and the side surface toward the inside of the cover bottom.
The method according to claim 1,
Wherein the grounding FPC is interposed between the grounding portion and the side surface of the first substrate, and both surfaces of the FPC are in close contact with the grounding portion and the side surface of the first substrate, respectively.
The method according to claim 1,
Wherein the grounding portion comprises a double side which is formed by an inner side surface extending from the side surface and a part of the side surface and folded inward to the inside of the side surface so as to have an overall shape bent in a U shape.
5. The method according to one of claims 2 to 4,
Wherein the grounding portion is rounded in a region in contact with the grounding FPC.
4. The method according to any one of claims 2 and 3,
And the first substrate corresponding to the grounding portion has a concave groove formed inward of the first substrate.
5. The method of claim 4,
And a bent portion that is vertically bent toward the inside of the cover bottom is provided at an end of the inner side surface.
8. The method of claim 7,
And a concave groove is formed in the first substrate corresponding to the bent portion.
The method according to claim 1,
The FPC further includes a connection part connected to one side of the first substrate at the one edge,
Wherein the connection portion has a first length covering both a top surface portion and a side surface of the first substrate,
The grounding FPC having a second length shorter than the first length,
And the second length corresponds to the thickness of the side surface of the first substrate.

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