KR20080047936A - Conductive tapes and liquid crystal display device having thereof - Google Patents

Abstract

A conductive tape and a liquid crystal display having the same are provided to remove static electricity generated from a liquid crystal panel by strengthening adhesive power of the conductive tape. A liquid crystal panel(10) is accommodated in a bottom cover. Conductive tapes(30) have one end attached to portions of the liquid crystal panel and the other end attached to portions of the bottom cover. The conductive tapes have one or more cutaway portions(31). The bottom cover is made of a conductive material. The conductive tapes are cloth tapes weaved with a conductive material. The bottom cover includes a lower surface portion(29a) disposed to be parallel to the liquid crystal panel at a lower portion of the liquid crystal panel, and a side portion(29b) extending from the lower surface portion and disposed to be perpendicular on at least one side of the liquid crystal panel.

Description

CONDUCTIVE TAPES AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THEREOF}

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

2 is a perspective cross-sectional view showing a part of a liquid crystal display device having a conductive tape having a cutout according to an embodiment of the present invention.

3 is a cross-sectional view showing a conductive tape formed with a cutout according to another embodiment of the present invention.

<Description of main parts of drawing>

10: liquid crystal panel 20: backlight unit

27: main support 29: bottom cover

30: conductive tape

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of reducing defects by reducing peeling of a conductive tape used in a liquid crystal display device.

Recently, a flat panel display such as a liquid crystal display (PDP), a plasma display panel (PDP), an organic light emitting diode (OLED), etc. has been developed in place of the conventional CRT.

Among these display devices, liquid crystal displays are displays that have advantages such as light weight, thinness, and low power, and are widely applied to not only display devices such as notebook computers, but also desktop computers and large TVs. There is a trend.

A liquid crystal display device is a display device using optical anisotropy of a liquid crystal, and implements an image by adjusting the light transmittance of the liquid crystal using an electric field. Such a liquid crystal display device generally includes a liquid crystal panel for displaying an image, a main support for fixing and supporting the liquid crystal panel at an edge of the liquid crystal panel, and a bottom cover for accommodating the liquid crystal panel and the main support. do.

The liquid crystal panel is composed of two substrates facing each other and a liquid crystal layer formed therebetween, and one of the two substrates has a fine thin film transistor and various wirings for driving the liquid crystal layer. In addition, a polarizer may be attached to an outer surface of the liquid crystal panel.

The liquid crystal panel having the structure as described above may generate static electricity at any time due to flow or friction, and in particular, static electricity is frequently generated by a polarizer attached to an outer surface of the liquid crystal panel. Static electricity refers to the accumulation of specific charges by friction or peeling, and discharges energy and changes to a low energy state by discharge.

However, when the static electricity is discharged, the voltage is very high, especially the electrical products are often shocked. Since the fine liquid crystal lines and the thin film transistors are formed in the liquid crystal panel, a problem such as short circuit or abnormal driving of the thin film transistors may occur when electrostatic discharge occurs, and thus the alignment direction of the liquid crystal may be adjusted. There is no abnormality in the display image.

Due to the electrostatic discharge, a defect occurs in the liquid crystal panel, which deteriorates the image quality, and thus an antistatic device is required.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a high-quality liquid crystal display that includes a conductive tape on a liquid crystal panel and a cover bottom, thereby eliminating static electricity generated in the liquid crystal panel and enhancing adhesion of the conductive tape to reduce defects caused by static electricity. To provide a device.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a liquid crystal panel, a bottom cover in which the liquid crystal panel is housed, and one end of which is attached to a portion of the liquid crystal panel, and the other end of which is attached to a portion of the bottom cover. And at least one conductive tape, wherein the conductive tape has at least one cutout.

The bottom cover is formed of a conductive material, characterized in that the conductive tape is a cloth tape woven with a conductive material.

The bottom cover includes a bottom portion disposed in parallel with the liquid crystal panel under the liquid crystal panel, and a side portion extending from the bottom portion and disposed vertically on at least one side of the liquid crystal panel, wherein the conductive tape is disposed on the bottom portion. It is attached to the outer side of the cover side part.

Polarizing plates are further provided on both sides of the liquid crystal panel, and the conductive tape is attached to the polarizing plates of the liquid crystal panel.

The cutout is formed at a portion corresponding to an end of the liquid crystal panel, and the cutting portion and the non-cutting portion are sequentially formed. At this time, the length of the cutting portion and the non-cutting portion may be various lengths, but preferably 2mm.

The conductive tape may have a cutout distinguishing mark formed on at least one side thereof so as to know the position of the formed portion of the cutout.

The liquid crystal display according to the present invention may further comprise a main support fixed to and supporting an edge of the liquid crystal panel and provided between an edge of the liquid crystal panel and a bottom cover side portion, wherein the conductive tape is formed on the main tape. It is characterized in that attached to a part of the support.

The conductive tape is characterized in that the pressure-sensitive adhesive is further formed on the surface attached to the liquid crystal panel and the cover bottom, the pressure-sensitive adhesive may be formed of a conductive material.

The present invention is to reduce the static electricity generated in the liquid crystal panel. In general, the liquid crystal panel may generate static electricity due to flow or friction, and the static electricity may cause defects in wirings, thin film transistors, and the like in the liquid crystal panel.

Thus, in the present invention, the liquid crystal panel and the bottom cover are electrically connected to each other by a conductive tape to prevent electrostatic discharge generated in the liquid crystal panel. The conductive tape is made of a conductive material and serves as a passage through which static electricity generated in the liquid crystal panel is discharged.

However, since the conductive tape may be peeled off due to the concentration of stress in a portion of the tape as the liquid crystal panel flows, the peeled phenomenon may occur. A tape and a liquid crystal display device using the tape.

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

1 is an exploded perspective view showing a liquid crystal display device according to the present invention, Figure 2 is a perspective cross-sectional view showing a part of the liquid crystal display device according to the present invention. In FIG. 2, a portion except for the top case 25 is illustrated for convenience of description.

1 and 2, the liquid crystal display according to the present invention includes a liquid crystal panel 10 and a backlight unit 20 disposed under the liquid crystal panel 10 to supply light to the liquid crystal panel 10. It is configured to include.

Here, the liquid crystal panel 10 and the backlight unit 20 are accommodated in the bottom cover 29 provided below the liquid crystal panel 10 and the backlight unit 20. At the edges of the liquid crystal panel 10 and the backlight unit 20, a main support 27 fixing and supporting the liquid crystal panel 10 and the backlight unit 20 is provided.

Although not shown, the liquid crystal panel 10 includes two opposing substrates made of a transparent material such as glass and a liquid crystal layer formed therebetween. In this case, a gate wiring and a data wiring are formed in a matrix form on a substrate of the liquid crystal panel 10 to define pixels, and thin film transistors (TFTs) are formed in each pixel.

In addition, polarizing plates (not shown) for polarizing light incident on the liquid crystal panel 10 are provided on both surfaces of the liquid crystal panel 10.

A top case 25 for exposing the display unit of the liquid crystal panel and fixing the edge of the liquid crystal panel is provided on the upper portion of the liquid crystal panel 10.

One side of the liquid crystal panel 10 includes a drive IC 11 electrically connected to a gate wiring formed on the substrate, and a printed circuit board 12 for applying an electrical signal to the wiring and the thin film transistor. The signal from the PCB 12 is transferred to the thin film transistors through the wirings of the drive ICs 11, and the thin film transistors apply a voltage to the pixels according to the signals to drive the liquid crystal layer.

The backlight unit 20 includes a lamp 21 for generating light, a light guide plate 24 for guiding light generated from the lamp 21 toward the liquid crystal panel 10, and an optical sheet 23 for increasing the efficiency of the light. It is configured to include.

In this case, the backlight unit 20 shown in the drawing corresponds to an edge type backlight unit in which the lamp 21 is located at one side. Although not shown, the LCD according to the present invention also includes a direct type backlight unit in which a plurality of lamps are disposed below the liquid crystal panel.

The light guide plate 24 guides the light emitted from the lamp 21 toward the liquid crystal panel 10.

The optical sheet 23 is composed of a diffusion sheet, a prism sheet, a protective sheet, and the like, and serves to increase the efficiency of light emitted toward the liquid crystal panel 10. The diffusion sheet serves to diffuse light from the lamp 21 to the liquid crystal panel 10, and the prism sheet collects light diffused from the diffusion sheet in a direction perpendicular to the plane of the upper liquid crystal panel 10. Chapter 2 is usually used. At the top of the optical sheet is provided a protective sheet to protect the prism sheet that is weak to scratches.

At the edges of the liquid crystal panel 10 and the backlight unit 20, a main support 27 for fixing and supporting the liquid crystal panel 10 and the backlight unit 20 is provided. The main support 27 has a stepped portion or a fastening groove formed therein so as to fix and support the liquid crystal panel 10 and the backlight unit 20, and has a hollow mold frame shape.

The bottom cover 29 is disposed under the liquid crystal panel 10 to accommodate the liquid crystal panel 10, and a bottom portion 29a disposed under the liquid crystal panel 10 in parallel with the liquid crystal panel 10. ) And a side surface portion 29b extending from the bottom surface portion 29a and vertically disposed on at least one side of the liquid crystal panel 10. At this time, the side portion 29b of the bottom cover is formed to cover the lower and outer surfaces of the main support 27 supporting the liquid crystal panel 10.

One side of the liquid crystal panel 10 is attached with a drive IC (11) for supplying an electrical signal to the liquid crystal panel 10, the other side of the liquid crystal panel 10 is not attached to the drive IC (11) Conductive tape 30 is attached to remove it.

At this time, the conductive tape 30 has the form of a pad having a rectangular shape having a long side and a short side. One end of the long side is bent to the liquid crystal panel 10 and the other end of the long side is bent together with the outer surface of the bottom cover side portion 29b and attached to the edge of the liquid crystal panel 10. Since the polarizing plate is attached to both surfaces of the liquid crystal panel, the conductive tape 30 is attached to the polarizing plate of the liquid crystal panel 10.

In the drawing, parts of the liquid crystal panel 10 and the bottom cover 29 are separately shown to indicate an attachment relationship. However, in a liquid crystal display device, portions attached to the liquid crystal panel 10 and portions attached to the bottom cover 29 are shown. Is integral.

In addition, since the main support 27 for fixing and supporting the liquid crystal panel 10 is provided between the liquid crystal panel 10 and the bottom cover 29, the conductive tape 30 has an upper surface of the main support 27. May be further attached to the portion.

The conductive tape 30 is for removing static electricity generated by charge accumulation by friction or the like in the process of handling the liquid crystal panel 10 or assembling with other components. The conductive tape 30 serves as a path for charge, and discharges the accumulated charge formed in the liquid crystal panel 10 toward the bottom cover 29, which is another conductor, to prevent electrostatic discharge.

Therefore, the bottom cover 29 is preferably formed of a conductive material such as metal, and more preferably grounded in order to discharge charges generated from the liquid crystal panel 10.

In addition, the conductive tape 30 is preferably made of a material containing a metal or other conductor so that electricity can pass through. It can be formed from a tape containing a metal or a cloth tape woven from a material containing a metal. Particularly, if the conductive tape is formed, the tape can be easily bent and has elasticity, but is not limited thereto.

However, when the liquid crystal panel 10 is attached to the liquid crystal panel 10 and the bottom cover 29 simply by considering the function of static electricity reduction, when the liquid crystal panel 10 causes displacement due to external influences such as vibration or shock, stress is applied to the attachment portion. Concentration occurs.

Referring to FIG. 2, the liquid crystal panel 10 may flow in up, down, left, and right directions, that is, in the x-axis, y-axis, and z-axis directions due to movement or vibration of the liquid crystal display. However, since the conductive tape 30 has a portion corresponding to the x-y plane, the conductive tape 30 is weak to the stress in the z-axis direction.

That is, since the conductive tape 30 is attached to the liquid crystal panel 10 and the bottom cover 29 at the same time, stress is concentrated at the boundary between the two attaching surfaces, but it is difficult to disperse the stress, so that the tape may peel off. have. The present invention can obtain a high adhesion effect by forming a cutout 31 in the stress concentration portion to facilitate the dispersion of stress.

Therefore, in order to relieve the stress in the z-axis direction of the conductive tape 30, the cutout portion 31 is formed to correspond to the side of the liquid crystal panel 10 to which the conductive tape 30 is attached (y-axis on the drawing). . At this time, the degree of freedom in the z-direction is increased by the cutout 31 to disperse the stress, thereby reducing the peeling of the conductive tape 10.

The cutout 31 is made to penetrate from the top surface to the bottom surface of the conductive tape 30. That is, the conductive tape 30 is cut and formed to vertically penetrate the surface of the conductive tape 30.

In this case, the cutout portion 31 may be in various forms such as a slit type, but preferably, the cutting portion C and the non-cutting portion D that are not cut are half cutting lines sequentially formed. It features. In this case, a plurality of cutting parts C may be formed as necessary. At this time, if the cutting portion (C) is formed too long, both ends of the cutting portion (C) may be stressed, there is a risk of damage or peeling. On the other hand, when formed too short, the stress dispersion effect is reduced. Therefore, it is desirable to form the appropriate length.

On the other hand, the cutting portion (C) is preferably formed in the conductive tape 30, both ends of the cutting line is preferably formed as a non-cutting portion (D). At this time, in order to prevent damage such as tearing of the conductive tape due to stress on the cutting portion C, the length of the non-cutting portion formed at both ends of the cutting line 31 may be longer than that of other non-cutting portions.

In addition, in order to reduce stress caused by the flow of the liquid crystal panel as much as possible, the cutting line 31 may be formed parallel to the sides of the liquid crystal panel 10 at a portion corresponding to the end of the liquid crystal panel 10. That is, the liquid crystal panel 10 and the conductive tape 30 are formed at a portion corresponding to the boundary between the surfaces.

At least one conductive tape 30 is attached to the other side to which the drive IC 11 is not attached. It is preferable to attach a plurality in order to effectively prevent static electricity, and may be attached in an appropriate number as necessary, such as the size and use of the liquid crystal panel 10.

The stress dispersion effect of the conductive tape 30 having the cutout 31 is shown in the following table. Table 1 shows the degree of adhesion between the conductive tape 30 having the cutout 31 and the conductive tape not having the cutout according to the present invention, together with a comparative example.

The embodiment shows the results of experiments of attaching five pieces of conductive tape having a width of 25 mm and a length of 18 mm having an incision to the liquid crystal panel, and then enduring without peeling to what extent in the z direction based on the same surface. . The comparative example was carried out five times each with the results of experiments in which the half cutting line was formed and the half cutting line was not formed in the shape of the incision under the same conditions. At this time, the length of the cutting portion and the non-cutting portion are 2mm. The unit is the weight acted in the z direction (in kg), and the larger the result value, the less peeling and better adhesion.

One 2 3 4 5 Average Example 4.20 4.81 5.00 4.75 4.55 4.66 Comparative example 4.20 3.35 3.00 3.50 3.05 3.42

As shown in the above table, the conductive tape (Example) with the cutout withstands the load in the z direction up to the weight of 4.66 kg, and the conductive tape without the half cutting line (Comparative Example) has an average of 3.42 kg. Withstand the load to the weight.

This result means that the adhesive force of about 36% is increased by making an incision. That is, when stress is applied in the z direction, the stress is effectively dispersed by the incision, thereby increasing the adhesive force of the conductive tape, and as a result, the peeling phenomenon is reduced.

On the other hand, the length of each of the cutting portion and the non-cutting portion of the conductive tape can be varied in various ways depending on the size and type of the liquid crystal panel, the shape and structure of the bottom cover, the material of the conductive tape, and the like. However, preferably, the cutting portion and the non-cutting portion have a length of 1.5 mm or more and 2.5 mm or less, respectively.

Table 2 shows the degree of adhesive force of the conductive tape according to the length of the cutting and non-cutting portion when forming the cutout, in particular the half-cutting line according to the present invention with a comparative example. In the following example, four conductive tapes having a width of 25 mm and a length of 18 mm having a half cutting line were attached to the liquid crystal panel, and then experiments were conducted on how to withstand the force in the z direction based on the same surface. The results are shown. This experiment was carried out 10 times each.

At this time, Example 1 is a conductive tape formed with a length of the cutting portion and the non-cutting portion of 1mm, Example 2 is a tape formed of 2mm, Example 3 is a tape made of 3mm. The conditions other than the cutting line are the same. The unit is the weight acted in the z direction (in kg), and the larger the result value, the less peeling and better adhesion.

Example 1 (1 mm) Example 2 (2 mm) Example 3 (3 mm) One 3.82 3.95 3.77 2 3.79 3.94 3.78 3 3.81 3.92 3.79 4 3.83 4.01 3.89 5 3.8 4.03 3.81 6 3.78 3.93 3.8 7 3.79 3.94 3.79 8 3.85 3.96 3.77 9 3.811 4.01 3.79 10 3.83 3.96 3.81 Average 3.811 3.965 3.8

As described above, in the case of the conductive tape (Example 1) formed to have the cutting portion and the non-cutting portion each having a length of 1 mm, the load withstand the average load of 3.811 kg. , Example 3 formed to a length of 3mm withstand a load in 3.8kg.

Therefore, the degree of dispersing the stress will vary depending on the length of the cutting portion and the non-cutting portion of the cutting line, but preferably 1.5 mm or more and 2.5 mm or less, and more preferably 2 mm.

On the other hand, in another embodiment according to the present invention, a cutout position distinguishing display for displaying the position where the cutout is formed on the conductive tape may be further formed. As described above, since the cutout is often formed only by a small line, a mark indicating the location of the cutout is provided on one side of the conductive tape to determine the attachment direction.

For example, in order to distinguish the direction in which the incision is located, a hole may be formed on the opposite side to the direction in which the incision is formed, or the end may be cut in a semicircular shape. The shape or method is not limited as long as the location of the incision can be distinguished.

Figure 3 is another embodiment showing a conductive tape 130 is formed with a cutout 131 according to the present invention.

Referring to FIG. 3, the cutout 131 is formed in the form of a half cutting line and is not formed in the entire region corresponding to the boundary of the surface on which the liquid crystal panel is attached, but is formed only on both sides of the stressed portion, and the cut portion and the non-cut portion. The length of the cut portion was also formed differently.

In addition, a portion of the conductive tape may be removed in a semicircle shape on the other side corresponding to one side where the cutout 131 is formed to distinguish the location of the cutout 131 to form the cutout position distinguishing display 150. have. The semicircle is exemplary and does not limit the shape of the cutout position indicator 150.

The present invention is not limited only to the structure as described above. The above-described structure is only one example for explaining the present invention.

For example, the liquid crystal display device according to the present invention may apply the shape of the conductive tape in various ways as well as a rectangular shape, and it is also possible to form different lengths of the cutting part and the non-cutting part when forming the cutout.

Accordingly, the scope of the present invention should not be defined by the above detailed description, but should be defined by the appended claims.

Therefore, according to the present invention, the stress applied to the conductive tape can be dispersed by forming a cutout in the conductive tape, thereby increasing the adhesive force of the conductive tape.

In addition, due to the strengthening of the adhesive force of the conductive tape, it is possible to provide a high-quality liquid crystal display device that effectively eliminates static electricity generated in the liquid crystal panel, thereby reducing defects caused by static electricity.

Claims (15)

A liquid crystal panel; A bottom cover in which the liquid crystal panel is accommodated; And One end is attached to a portion of the liquid crystal panel and the other end is configured to include at least one conductive tape attached to a portion of the bottom cover, And the conductive tape has at least one cutout portion. The method of claim 1, And the bottom cover is made of a conductive material. The method of claim 1, And the conductive tape is a cloth tape woven from a conductive material. The method of claim 1, The bottom cover is A bottom portion disposed in parallel with the liquid crystal panel below the liquid crystal panel; Extends from the bottom portion and is configured to have a side portion disposed perpendicular to at least one side of the liquid crystal panel, And the conductive tape is attached to an outer surface of the bottom cover side portion. The method of claim 1, The liquid crystal panel has a polarizing plate attached to both sides, And the conductive tape is attached to the polarizing plate. The method of claim 5, And the cutout is formed at a portion corresponding to an end of the liquid crystal panel. The method of claim 6, And the cutout is a half cutting line in which the cutting portion and the non-cutting portion are sequentially formed. The method of claim 7, wherein And a length of the cutting portion and the non-cutting portion is 1.5 mm or more and 2.5 mm or less, respectively. The method of claim 1, The conductive tape is a liquid crystal display device characterized in that the cut-out position distinguishing display is formed on at least one side. The method of claim 1, Fixing and supporting the edge of the liquid crystal panel and further comprising a main support provided between the edge of the liquid crystal panel and the bottom cover side portion, wherein the conductive tape is attached to a portion of the main support Device. The method of claim 1, The conductive tape is a liquid crystal display device characterized in that the pressure-sensitive adhesive is further formed on the surface attached to the liquid crystal panel and the cover bottom. The method of claim 11, And the adhesive is formed of a conductive material. It is configured to include a main body and a cutout formed inside the main body, The cutout is a conductive tape for a liquid crystal display device, characterized in that the cutting portion and the non-cutting portion is a half cutting line sequentially formed. The method of claim 13, The length of the cutting portion and the non-cutting portion is a conductive tape for the liquid crystal display device, characterized in that each 1.5mm or more and 2.5mm or less. The method of claim 13, The main body further comprises a cut-out position distinguishing display formed on at least one side.

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