KR102480329B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to an FPC on which light emitting devices are mounted and drawn out through an FPC through hole provided in the lower cover, and a protrusion disposed in the lower cover and supporting the FPC to be drawn out in a vertical direction with respect to the side surface of the lower cover. It provides a liquid crystal display device including a guide holder having a.

Description

Liquid crystal display {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 improving a degree of freedom of fastening according to a fastening position of a system connector by changing an FPC lead-out structure of a light source array.

A liquid crystal display device has a high contrast ratio, is suitable for gradation display or moving image display, and has a growing proportion among flat panel displays due to its characteristics of low power consumption.

This liquid crystal display device is divided into a liquid crystal display module (LCM) and a driving circuit for driving the liquid crystal display module, and the liquid crystal display module is composed of matrix-type liquid crystal cells injected between two glass substrates. It is divided into a liquid crystal panel unit composed of switching elements for respectively switching supplied signals and a backlight unit for irradiating light to the liquid crystal panel unit.

The liquid crystal panel unit and the backlight unit must be fastened together in an integrated form and must be protected by a case so as not to be damaged by external impact.

Meanwhile, the driving circuit unit is mounted on a printed circuit board (hereinafter referred to as 'PCB') to drive the liquid crystal panel unit. At this time, a flexible printed circuit (FPC) is used to connect the liquid crystal panel unit and the printed circuit board, and the FPC is directly attached to the substrate and the PCB of the liquid crystal panel unit using a conductive resin or a connector.

FPC has a structure in which a single or multi-layered metallic conductive layer is inserted between flexible material layers such as polyamide. Accordingly, control signals and DC voltages input from the outside are transmitted to the liquid crystal panel unit through signal lines mounted on the printed circuit board.

Hereinafter, a liquid crystal display device according to the prior art will be described in detail.

1 is a perspective view of the rear of a liquid crystal display device according to the prior art.

2 is an enlarged perspective view of a part of the rear surface of a liquid crystal display device according to the prior art.

3 is a combined cross-sectional view of a part of the rear surface of a liquid crystal display according to the prior art.

4 is a perspective view of the rear surface of a liquid crystal display according to the prior art, schematically showing a state before attaching a blocking tape.

5 is a partial enlarged view of a rear perspective view of a liquid crystal display device according to the prior art.

FIG. 6 is a combined cross-sectional view of the rear surface of the liquid crystal display along line VI-VI of FIG. 5 .

1 to 3, the liquid crystal display according to the prior art includes a liquid crystal panel 10 and a backlight unit (not shown) providing light to the liquid crystal panel 10.

The backlight unit (not shown) includes a light guide plate 40 disposed under the liquid crystal panel 10, a light source array 60 disposed on one side of the light guide plate 40, and the light guide plate 40 and the liquid crystal panel 10. ) The optical sheets 50 disposed between, the guide holder 70 disposed under the light guide plate 40, the guide holder 70, the light source array 60, the light guide plate 40, and the optical sheets (50) and the like are accommodated and includes a lower cover (80).

Further, a guide panel 30 surrounding the lower cover 80 is disposed outside the lower cover 80, and a liquid crystal panel 10 is seated and disposed on the upper surface thereof.

Although not shown in the drawing, the liquid crystal panel 10 includes a color filter substrate provided with a color filter layer for realizing color, a TFT array substrate facing and bonded to the color filter substrate, and a liquid crystal sealed between the two substrates. It is composed of layers (not shown), and a printed circuit board (hereinafter referred to as 'PCB') is connected to a corner portion of the TFT array substrate to provide various control signals and data signals.

That is, although not shown in the drawing, the TFT array substrate on which the thin film transistors are formed includes data lines that transmit image signals, gate lines that cross the data lines vertically to define each pixel and transmit scanning signals, and the gate lines. and thin film transistors respectively formed at intersections of the data lines, and pixel electrodes formed in each pixel. One end of the gate line and the data line is connected to a gate driving IC (not shown) and a data driving circuit.

The gate driving circuit (not shown) is connected to the FPC 62 by LOG lines (not shown), and the data driving circuit (not shown) is directly connected to the FPC 62 to finally form a printed circuit board (not shown). city) is connected to

A printed circuit board (not shown) is electrically connected to the liquid crystal panel 10 to supply control signals and video signals of driving integrated circuits. It is seated and fixed. At this time, an FPC 62 is connected between the printed circuit board (not shown) and the liquid crystal panel 10 .

A plurality of light emitting elements 60 are mounted on one side of the FPC 62 at regular intervals, and the plurality of light emitting elements 60 are located at an entrance of the light guide plate 40 of the backlight unit located below the liquid crystal panel 10. It is arranged so as to face the light surface.

In addition, one end of the FPC 62 is folded to the rear surface of the lower cover 80 in a state where it protrudes to the outside of the lower cover 80 through the FPC through hole 82 formed in the lower cover 80 to form a printed circuit board. (not shown). At this time, the FPC 62 is folded toward the rear surface of the lower cover 80 by a cover shielding tape 64 attached thereon and disposed on the rear surface of the lower cover 80 in a fixed state. It is connected to a printed circuit board (not shown).

In particular, the cover blocking tape 64 blocks the inflow of foreign matter into the liquid crystal display module through the FPC through-hole 82 of the lower cover 80 .

However, since the FPC 62 is folded and fixed to the rear side of the liquid crystal display module (LCM) by the cover blocking tape 64 in a state of being drawn out of the liquid crystal display device module (LCM), some customers Depending on the position of the fastening part of the system, fastening of the FPC 62 becomes impossible, and the degree of freedom of the fastening part is limited. For example, when the location of the connector of the customer system is outside the liquid crystal display module, it is impossible to fasten with the existing structure.

And, as shown in FIGS. 4 to 6, when the cover blocking tape 64 is removed and then coupled to a specific customer system, the FPC 64 draw-out part sags while being drawn out through the FPC through-hole, so it is difficult to fasten the FPC. Difficulties arise, and foreign matter inflow occurs through the FPC through-hole.

As such, the drawing direction of the FPC in the state before the cover blocking tape is attached is perpendicular to the rear surface of the liquid crystal display module (LCM).

Therefore, in the conventional structure in which the cover blocking tape is attached, since fastening is possible only in one direction, that is, inside the rear surface of the liquid crystal display module (LCM), it is impossible to fasten to the outside of the liquid crystal display module.

In addition, since the cover blocking tape must be removed in order to fasten the FPC to a specific customer system, a separate fixing structure is required when bending the FPC to the outside of the liquid crystal display module (LCM).

Therefore, when the FPC is bent outward from the liquid crystal display module (LCM) without a separate fixing structure, a restoring force is generated in the original direction of the drawing portion of the FPC, making it impossible to fasten the FPC to a specific system.

In addition, since the cover blocking tape must be removed in order to fasten the FPC to a specific customer system, there is a possibility that foreign substances may flow into the LCD module through the FPC penetration hole provided in the lower cover.

An object of the present invention is to provide a liquid crystal display device capable of improving the degree of freedom of fastening according to the fastening position of a system connector by changing the FPC lead-out structure.

In order to solve the above problems, in one aspect, the present invention is an FPC in which light emitting elements are mounted and drawn out through an FPC through hole provided in the lower cover, and disposed in the lower cover, and the FPC is disposed in the lower cover It is possible to provide a liquid crystal display device including a guide holder having a protrusion for supporting to be drawn out in a vertical direction with respect to the side of the.

In the liquid crystal display device according to the present invention, the protruding portion of the guide holder may protrude to a side surface of the guide panel outside the FPC through hole.

In the liquid crystal display device according to the present invention, a cover blocking tape may be attached to the rear and side surfaces of the lower cover including the FPC through hole.

In the liquid crystal display device according to the present invention, the cover blocking tape may be attached to the lower cover to cover the FPC through hole.

In the liquid crystal display device according to the present invention, the FPC may be independently installed and separated from the cover blocking tape.

In the liquid crystal display device according to the present invention, the cover blocking tape may include a cover portion blocking the FPC through hole and an FPC guide portion through which the FPC is drawn out.

In the liquid crystal display device according to the present invention, the FPC guide portion of the cover blocking tape may include a side adhesive portion attached to a side surface of the lower cover and spaced apart from each other, and a guide groove provided between the side adhesive portions.

The liquid crystal display device according to the present invention uses a guide holder having a protruding part to support the FPC so that the FPC is drawn outward from the liquid crystal display module through the FPC through-hole of the lower cover, thereby improving the degree of freedom of the drawing part of the FPC. Customer specifications can be met, and system assembly defects can be improved.

In addition, when bending the existing liquid crystal display module (LCM) to the outside, the cover blocking tape had to be removed, so the FPC through hole was exposed to the outside, resulting in a defect in foreign matter inflow. However, in the present invention, the FPC is Regardless, since the outward bending of the liquid crystal display module (LCM) is possible by the protruding part of the guide holder, the cover blocking tape keeps the FPC through hole covered, preventing the inflow of foreign substances through the FPC through hole in advance. is prevented in

1 is a perspective view of the rear of a liquid crystal display device according to the prior art.
2 is an enlarged perspective view of a part of the rear surface of a liquid crystal display device according to the prior art.
3 is a combined cross-sectional view of a part of the rear surface of a liquid crystal display according to the prior art.
4 is a perspective view of the rear surface of a liquid crystal display device according to the prior art, schematically showing a state before attaching a blocking tape.
5 is a partial enlarged view of a rear perspective view of a liquid crystal display device according to the prior art.
FIG. 6 is a combined cross-sectional view of the rear surface of the liquid crystal display along line VI-VI of FIG. 5 .
7 is a perspective view of the rear side of the liquid crystal display device according to the present invention.
8 is an enlarged perspective view of a part of the rear surface of the liquid crystal display according to the present invention.
FIG. 9 is a combined cross-sectional view of a part of the rear surface of the liquid crystal display along line IX-IX of FIG. 8 .
10 is a perspective view of the rear side of the liquid crystal display device according to the present invention, schematically showing a state before attaching a blocking tape.
FIG. 11 is a combined cross-sectional view of the rear surface of the liquid crystal display along line XI-XI of FIG. 10 .
12 is an enlarged cross-sectional view of section A of FIG. 11 .
13 is a schematic perspective view of a guide holder according to the present invention.
14 is an enlarged perspective view of part B of FIG. 13;

Hereinafter, a liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

7 is a perspective view of the rear side of the liquid crystal display device according to the present invention.

8 is an enlarged perspective view of a part of the rear surface of the liquid crystal display according to the present invention.

FIG. 9 is a combined cross-sectional view of a part of the rear surface of the liquid crystal display along line IX-IX of FIG. 8 .

10 is a perspective view of the rear side of the liquid crystal display device according to the present invention, schematically showing a state before attaching a blocking tape.

As shown in FIGS. 7 to 9 , the liquid crystal display device according to the present invention includes a liquid crystal panel 110 displaying images and a backlight unit (not shown), and includes the liquid crystal panel 110 and a backlight unit (not shown). ) Includes a guide panel 130 for modularizing.

Further, the liquid crystal panel 110 is seated and disposed on the upper surface of the guide panel 130, and the lower cover 180 wrapped and fixed by the guide panel 130 is disposed below the liquid crystal panel 110. do.

A plurality of light emitting devices 160, a light guide plate 140, and an optical sheet 150 are accommodated and fixed in the lower cover 180, and an FPC through hole 182 is provided on one side.

In addition, an FPC (Flexible Printed Circuit) 162 having a plurality of light emitting devices 160 mounted on one side of the lower cover 180 is provided, and the FPC 162 is provided with the lower cover 180 It is drawn out through the FPC through hole 182 provided in the.

A guide holder 170 having a protrusion 172 supporting the FPC 162 to be drawn out in a vertical direction with respect to the side surface of the lower cover 180 is provided inside the lower cover 162 .

A more detailed description of the liquid crystal display having this configuration is as follows.

The liquid crystal display device according to the present invention is composed of a liquid crystal panel 110 displaying an image and a backlight unit (not shown), and a guide panel 130 for modularizing the liquid crystal panel 110 and the backlight unit (not shown), and A case top 190 surrounding the upper surface edge of the liquid crystal panel 110 and the guide panel 130 is included.

The liquid crystal panel 110 is a part that plays a key role in image expression, and includes a first substrate 112 and a second substrate 114 bonded face to face with a liquid crystal layer (not shown) therebetween.

At this time, although not shown on the drawing, the inner surface of the first substrate 112, which is usually called an upper substrate or a color filter substrate, corresponds to each pixel, for example, red (R), green (G), and blue (B) colors. A color filter and a black matrix covering each of the gate lines, data lines, and thin film transistors are provided. In addition, color filters of red (R), green (G), and blue (B) colors and a transparent common electrode covering the black matrix are provided.

Also, on the inner surface of the first substrate 114, which is called a lower substrate or an array substrate, pixels are defined by crossing a plurality of gate lines and data lines, and thin film transistors (TFTs) are provided at each intersection. It is provided and connected to the transparent pixel electrode formed in each pixel in a one-to-one correspondence.

Polarizers 116 and 118 selectively transmitting only specific light are attached to outer surfaces of the first and second substrates 112 and 114, respectively.

Also, the second substrate 114 is additionally provided with a pad area, that is, a pad portion (not shown) compared to the first substrate 112, so that the area of one edge is larger.

Accordingly, a driving circuit (not shown) for applying signals to a plurality of gate lines and data lines is configured in the pad portion, which is one edge of the second substrate 114 .

This structure is referred to as a COG (chip on glass) liquid crystal panel 110. The COG method is a method of directly bonding a driving circuit onto the second substrate 114 using an anisotropic conductive film (not shown). As a result, the liquid crystal panel 110 has an advantage of increasing the ratio occupied by the liquid crystal display device.

The driving circuit includes a plurality of gate and data driving circuits, and each gate and data driving circuit is connected to a gate and a data line (not shown) on the second substrate 114 .

And, the gate and data driving circuit is connected to the FPC 162 outputting various signal voltages.

At one edge of the FPC 162, a plurality of wiring patterns (not shown) connected to data and gate driving circuits are aligned and adhered to the liquid crystal panel 110 through an anisotropic conductive film (not shown).

In the liquid crystal panel 110, when the thin film transistors selected for each gate line are turned on by the on/off signal of the gate driving circuit, the signal voltage of the data driving circuit is transferred to the corresponding pixel electrode through the data line. The arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, resulting in a difference in transmittance.

Further, a backlight unit (not shown) 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 expressed to the outside.

Meanwhile, the backlight unit (not shown) is disposed under the liquid crystal panel 110 and serves to provide light to the liquid crystal panel 110 .

The backlight unit (not shown) includes a lower cover 180, a plurality of light emitting elements 160 disposed on one side of the lower cover 180, a light guide plate 140 disposed adjacent to the light emitting element 160, and , Optical sheets 150 disposed above the light guide plate 140 and a reflective sheet 142 disposed below the light guide plate 140 .

The light emitting device 160 may be an R, G, or B light emitting diode emitting monochromatic light of R (Red), G (Green), or B (Blue) or a light emitting diode emitting white light, and may be a side view (side view). View) type element can be used.

When a light emitting device emitting monochromatic light is used, R, G, and B monochromatic light emitting devices are alternately arranged at regular intervals to mix the monochromatic light emitted therefrom into white light and then supplied to the liquid crystal panel 110. can In contrast, when a light emitting device emitting white light is used, a plurality of light emitting devices may be arranged at regular intervals to supply white light to the liquid crystal panel 110 .

For example, the white light emitting element is composed of a blue light emitting element emitting blue light and a phosphor emitting yellow light by absorbing blue monochromatic light, and the blue monochromatic light output from the blue light emitting element and the yellow monochromatic light emitting from the phosphor The mixed light may be supplied to the liquid crystal panel 110 as white light.

In the drawing, it is shown that the light emitting elements are disposed on one side of the light guide plate 140 as a side-type backlight unit, but it is not limited thereto, and may be disposed on the other side of the light guide plate 140, and even in a direct-type backlight unit. can be applied

In addition, although a light emitting element is used as a light source, it is not limited thereto, and various light sources generating light such as a cold cathode fluorescent lamp may be used.

The light guide plate (LGP) 140 serves to guide light emitted from the light emitting devices 160 to the liquid crystal panel 110 . The light incident on one side of the light guide plate 140 is repeatedly refracted and reflected by the diffusing agent added to the inside of the light guide plate 140 to proceed to the other side, and then is emitted to the top of the light guide plate 140 . That is, the light guide plate 140 serves to change light having an optical distribution in the form of a point light source or linear light source into light having an optical distribution in the form of a surface light source.

The reflective sheet 142 is disposed under the light guide plate 140 and serves to reflect light emitted downward from the light guide plate 140 toward the liquid crystal panel 110 . The reflective sheet 142 can adjust the amount of reflection of all incident light so that the entire light emission surface has a uniform luminance distribution.

Although not shown in the drawings, the optical sheets 140 include a diffusion sheet (not shown) for diffusing light emitted from the light guide plate 140 and liquid crystal by condensing the light diffused by the diffusion sheet (not shown). It includes a plurality of prism sheets (not shown) that uniformly supply light to the entire area of the panel 110 .

Although the diffusion sheet is usually provided with one sheet, the prism sheet may include a first prism sheet and a second prism sheet in which the prisms perpendicularly cross each other in the X and Y axis directions. The first prism sheet and the second prism sheet may improve straightness of light by refracting light in the X and Y axis directions.

A pattern (not shown) may be formed on one surface of the prism sheet to more uniformly distribute the luminance of light, and the shape of the pattern may be formed in various shapes such as a mountain, a hemisphere, and a polygon.

Meanwhile, a guide panel 130 is disposed outside the lower cover 180 to cover the lower cover, and an edge of the liquid crystal panel 110 is seated and disposed on the upper surface of the guide panel 130 .

The FPC connection structure of the above-described liquid crystal display will be described in detail with reference to the accompanying drawings.

As shown in FIG. 9 , the FPC 162 of the present invention is bent to the outside of the liquid crystal display in the process of modularizing the liquid crystal display and coupled with an external system.

A plurality of light emitting elements 160 are mounted on one surface of the FPC 162 at regular intervals, and the plurality of light emitting elements 160 are located at the entrance of the light guide plate 140 of the backlight unit located below the liquid crystal panel 110. It is arranged so as to face the light surface.

And, as shown in FIG. 10 , one end of the FPC 162 protrudes to the outside of the lower cover 180 through the FPC through hole 182 formed in the lower cover 180 .

A guide holder 170 having a protrusion 172 supporting the FPC 162 to be drawn out in a vertical direction with respect to the side surface of the lower cover 180 is provided inside the lower cover 162 . At this time, the protruding part 172 of the guide holder 170 protrudes to the side surface of the guide panel 130 outside the FPC through hole 182 and is arranged to support and fix the FPC 162 .

Therefore, the FPC 162 is drawn outward from the liquid crystal display module through the FPC through hole 182 of the lower cover 180 by using the guide holder 170 having the protrusion 172. ) is supported and fixed, it is possible to improve the degree of freedom of the drawing part of the FPC 162 to meet the customer's specifications, and to improve system assembly defects.

In addition, cover shielding tape 164 is attached to the rear and side surfaces of the lower cover 180 including the FPC through hole 182. At this time, the cover blocking tape 184 is attached to the rear surface of the lower cover 180 to cover the FPC through hole 182 . In particular, the FPC 162 is independently separated and disposed without interference of the cover blocking tape 164. Accordingly, the cover blocking tape 164 covers the FPC through hole 182 of the lower cover 180, thereby blocking foreign substances from entering the liquid crystal display module through the FPC through hole 182.

And, as shown in FIGS. 8 and 9, the cover blocking tape 164 includes a cover part 164a blocking the FPC through hole 182 and an FPC guide part 164b from which the FPC 162 is drawn out. include At this time, the FPC guide part 164b of the cover blocking tape 164 is attached to the side surface of the lower cover 180 and spaced apart from each other with a side adhesive part (not shown) and a guide groove provided between the side adhesive parts (not shown). ) is composed of

That is, the FPC 162 bent outward of the liquid crystal display device by the protruding portion 172 of the guide holder 170 while the cover blocking tape 164 is attached to the rear and side surfaces of the lower cover 180 is drawn out through a guide groove (not shown) of the FPC guide part 164b.

On the other hand, when the cover blocking tape is not attached to the back of the lower cover, the liquid crystal display structure in which the FPC is drawn out will be described with reference to FIGS. 11 to 14.

FIG. 11 is a combined cross-sectional view of the rear surface of the liquid crystal display taken along line XI-XI of FIG. 10, and FIG. 12 is an enlarged cross-sectional view of portion A of FIG.

13 is a schematic perspective view of a guide holder according to the present invention, and FIG. 14 is an enlarged perspective view of part B of FIG. 13 .

As shown in FIGS. 11 and 12 , as in FIG. 9 , the FPC 162 of the present invention is bent to the outside of the liquid crystal display in the process of modularizing the liquid crystal display and coupled with an external system.

A plurality of light emitting elements 160 are mounted on one surface of the FPC 162 at regular intervals, and the plurality of light emitting elements 160 are located at the entrance of the light guide plate 140 of the backlight unit located below the liquid crystal panel 110. It is arranged so as to face the light surface.

And, one end of the FPC 162 protrudes from the outside of the lower cover 180, that is, facing the side of the lower cover 180 through the FPC through hole 182 formed in the lower cover 180.

As shown in FIGS. 13 and 14, the lower cover 162 has a guide holder provided with a protrusion 172 supporting the FPC 162 to be drawn out in a vertical direction with respect to the side surface of the lower cover 180. 170 is provided. At this time, the protruding part 172 of the guide holder 170 protrudes to the side surface of the guide panel 130 outside the FPC through hole 182 and is arranged to support and fix the FPC 162 .

As described above, the liquid crystal display device according to the present invention supports and fixes the FPC so that the FPC is drawn outward of the liquid crystal display module through the FPC through hole of the lower cover using the protruding portion provided in the guide holder, thereby fixing the FPC. It is possible to meet the customer's specifications by improving the degree of freedom of the drawing part, and it is possible to improve system assembly defects.

In addition, since the cover blocking tape had to be removed when bending the existing liquid crystal display module (LCM) to the outside, the FPC through hole was exposed to the outside, resulting in a defect in foreign matter inflow. However, in the present invention, the FPC is Since the outward bending of the liquid crystal display module (LCM) is possible by the protruding part of the guide holder without interference, and the cover blocking tape keeps the FPC through hole covered, the inflow of foreign matter through the FPC through hole is prevented in advance. prevented

Although embodiments have been described with reference to the drawings, the present invention is not limited thereto.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

110: liquid crystal panel 130: guide panel
140: light guide plate 160: light emitting element
162: FPC (Flexible Printed Circuit) 164: Cover blocking tape
164a: cover part 164b: FPC guide part
170: guide holder 172: protrusion
180: lower cover

Claims (7)

a liquid crystal panel displaying an image;
a guide panel on which the liquid crystal panel is seated;
a lower cover disposed under the liquid crystal panel and wrapped around and fixed by the guide panel;
a plurality of light emitting elements, a light guide plate, and an optical sheet accommodated in the lower cover;
an FPC on which the light emitting elements are mounted and led out through an FPC through hole provided in the lower cover;
a guide holder disposed within the lower cover and having a protrusion for supporting the FPC to be drawn out in a vertical direction with respect to a side surface of the lower cover; and
And a cover blocking tape attached to the rear and side surfaces of the lower cover including the FPC through hole,
The cover blocking tape includes a cover part blocking the FPC through hole and an FPC guide part through which the FPC is drawn out. The liquid crystal display device of claim 1 , wherein the protruding portion of the guide holder protrudes to a side surface of the guide panel outside the FPC through hole. delete The liquid crystal display device of claim 1 , wherein the cover blocking tape is attached to the lower cover to cover the FPC through hole. The liquid crystal display device of claim 1 , wherein the FPC is independently separated and supported by the protrusion of the guide holder without interference of the cover blocking tape. delete The liquid crystal display device of claim 1 , wherein the FPC guide part of the cover blocking tape includes a side adhesive part attached to a side surface of the lower cover and spaced apart from each other, and a guide groove provided between the side adhesive parts.

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