KR20070041830A - Double coated conductive tape and testing method of liquid crystal display using the same - Google Patents

Abstract

The present invention relates to a conductive double-sided tape that can reduce the cost of the liquid crystal display device by attaching and detaching the auxiliary connector using a conductive double-sided tape and a method of inspecting the liquid crystal display device using the same.

The present invention includes a conductive layer having a tacky and spaced apart at predetermined intervals, an insulating layer formed between the conductive layers and having an adhesive property, first and second peeling films protecting the conductive layer and the insulating layer. One side of the conductive layer is attached to a signal pad electrode of a printed circuit board of an LCD to display an image, and the other side of the conductive layer is connected to an auxiliary cable connected to a power board that supplies a driving voltage to the liquid crystal display. The present invention relates to a conductive double-sided tape, which is attached to an output pin of a connector, and an inspection method of a liquid crystal display device using the same.

High voltage stress, aging, conductive double sided tape, conductive layer, output pin, signal pad electrode

Description

DOUBLE COATED CONDUCTIVE TAPE AND TESTING METHOD OF LIQUID CRYSTAL DISPLAY USING THE SAME}

1 is a perspective view showing an auxiliary connector according to an embodiment of the present invention.

2 is a plan view illustrating an auxiliary connector and a printed circuit board according to an exemplary embodiment of the present invention.

3 is a perspective view showing a conductive double-sided tape according to an embodiment of the present invention.

4 is a cross-sectional view taken along line IV-VI ′ of FIG. 3.

5 is a perspective view illustrating a state in which an auxiliary connector according to an embodiment of the present invention is attached to a printed circuit board.

FIG. 6 is a cross-sectional view taken along line VI-VI ′ of FIG. 5.

7 is a view for explaining a high voltage stress test method according to an embodiment of the present invention.

<Code Description of Main Parts of Drawing>

10: auxiliary connector 20: support member

30: protective cover 40: fixed body

50: conductive terminal 60: input pin

70: output pin 80: liquid crystal display device

90: printed circuit board 100: substrate

110: signal pad electrode 120: signal line

130: photo solder resist 150: main connector

160: conductive double-sided tape 170: first peeling film

180: second peeling film 190: conductive layer

200: insulation layer 210: aging test drive equipment

220: high voltage stress power supply board 230: main cable

240: auxiliary cable

The present invention relates to a conductive double-sided tape and a method for inspecting a liquid crystal display device using the same, and particularly, to a conductive double-sided tape and a liquid crystal display device using the same, which can reduce the cost of the liquid crystal display device by attaching and detaching an auxiliary connector using the conductive double-sided tape. It is about an inspection method.

In general, a liquid crystal display device injects a liquid crystal material between two substrates each having an electrode for generating an electric field, and applies a different potential to the two electrodes to form an electric field to change the arrangement of the liquid crystals, thereby improving light transmittance. It is a device that expresses an image by adjusting.

Such liquid crystal display devices are shipped after being tested for aging before being shipped to improve reliability. Here, the aging refers to a process of checking the image quality of the liquid crystal display device for several hours (for example, 8 hours) in a chamber of high temperature (for example, 50 ° C).

However, since the aging has a long inspection time and decreases productivity, recently, a high voltage is applied to the liquid crystal display device for a short time (for example, 1 hour) in a chamber of high temperature (for example, 50 ° C.). High voltage stress (HVS), which is a process of checking the image quality of a display device, has been developed and applied. To this end, separate circuit components (eg, auxiliary connectors) used in high voltage stress are mounted on the printed circuit board of the liquid crystal display device. However, these circuit components are one-time circuit components used only in high voltage stress, thereby raising the cost of the liquid crystal display device.

Accordingly, an aspect of the present invention is to provide a conductive double-sided tape and a method of inspecting the liquid crystal display device using the same, which can reduce the cost of the liquid crystal display by attaching and detaching an auxiliary connector using the conductive double-sided tape.

In order to achieve the above object, the present invention is spaced apart at predetermined intervals and has a tacky conductive layer, an insulating layer formed between the conductive layers and having a tacky, first and second peeling to protect the conductive layer and the insulating layer. A film, wherein one side of the conductive layer is attached to a signal pad electrode of a printed circuit board of the liquid crystal display for displaying an image, and the other side of the conductive layer is connected to a power board for supplying a driving voltage to the liquid crystal display. It provides a conductive double-sided tape, characterized in that attached to the output pin of the auxiliary connector connected to the auxiliary cable.

The power board is a high voltage stress power board for supplying a high voltage stress driving voltage to the liquid crystal display.

The width of the conductive layer is smaller than the width of at least one of the signal pad electrode and the output pin.

In order to achieve the above object, the present invention comprises the step of attaching a conductive double-sided tape on the signal pad electrode of the printed circuit board of the liquid crystal display device, connected to a power board for supplying a driving voltage to the liquid crystal display device on the conductive double-sided tape Attaching an output pin of the auxiliary connector connected to the auxiliary cable, inputting a test signal to the main connector of the liquid crystal display device, and supplying the driving voltage to the liquid crystal display device. Provides a method of inspecting a display device.

The step of attaching the conductive double-sided tape on the signal pad electrode is characterized in that the step of attaching so that the conductive layer of the signal pad electrode and the conductive double-sided tape overlap.

The step of attaching the output pin on the conductive double-sided tape is characterized in that the step of attaching so that the conductive layer and the output pin of the conductive double-sided tape.

The width of the conductive layer is smaller than at least one of the width of the signal pad electrode and the output pin.

The method may further include removing the first and second peeling films of the conductive double-sided tape.

The power board is a high voltage stress power board for supplying a high voltage stress driving voltage to the liquid crystal display.

Other objects and features of the present invention in addition to the above object will become apparent from the description of the embodiments with reference to the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing an auxiliary connector according to an embodiment of the present invention, Figure 2 is a plan view showing an auxiliary connector and a printed circuit board according to an embodiment of the present invention.

1 and 2, the auxiliary connector 10 according to the embodiment of the present invention is a support member 20, the conductive terminal 50 and the fixed body 40 in contact with the upper surface of the printed circuit board 90 ) Is applied to the signal pad electrode 110 of the printed circuit board 90 to protect the cover 30, the fixed body 40 to accommodate the conductive terminal 50, the power from the high-voltage stress power board Conductive terminal 50 is included.

The support member 20 protrudes from both sides of the protective cover 30 so as to contact the upper surface of the printed circuit board 90 and may be integrally formed with the protective cover 30 or may be formed separately. The support member 20 serves to disperse the external force applied from the upper portion of the auxiliary connector 10 in contact with the upper surface of the printed circuit board 90.

The protective cover 30 is provided with four surfaces to surround the fixed body 40, and the storage space 35 for accommodating the fixed body 40 is provided by the four surfaces. That is, the fixed body 40 coupled to the conductive terminal 50 is inserted into the storage space 35, and the fixed body 40 and the conductive terminal 50 are protected from external force.

The fixed body 40 is formed in a polygonal shape and prevents the conductive terminals 50 arranged in a line from moving from a designated position and are generally made of a non-metallic material.

The conductive terminal 50 includes a plurality of input pins 60 and a plurality of output pins 70.

The plurality of input pins 60 are arranged in a line spaced apart from each other at regular intervals. One end of the plurality of input pins 60 is connected to the auxiliary cable connected to the high voltage stress power board, and the other end is connected to the plurality of output pins 70. In other words, the plurality of input pins 60 are supplied with power from the high voltage stress power board through the auxiliary cable 240 to supply the plurality of output pins 70.

The plurality of output pins 70 protrude to opposite sides in a one-to-one correspondence with the plurality of input pins 60, one end of which is connected to the plurality of input pins 60 and the other end of the signal pad electrode 110 of the printed circuit board 90. ) Is connected. In other words, the plurality of output pins 70 supplies the power from the input pins 60 to the signal pad electrode 110 of the printed circuit board 90.

The printed circuit board 90 is provided with a signal pad electrode 110 to receive power from the output pin 70 and a signal line 120 connected thereto. The surface of the signal pad electrode 110 is exposed and is supplied to the signal line 120 by receiving power from the output pin 70. The signal line 120 supplies power from the signal pad electrode 110 to the driving circuit of the liquid crystal display device.

However, conventionally, the output pins of the conductive terminals and the signal pad electrodes are connected by soldering or the like. However, the auxiliary connector is a one-time component used only in high voltage stress, causing a problem of raising the cost of the liquid crystal display. Therefore, the embodiment of the present invention applies a method of detaching and attaching the auxiliary connector by improving the existing method of mounting the auxiliary connector. For this purpose, the conductive double-sided tape shown in Figs. 3 and 4 is used.

3 is a perspective view showing a conductive double-sided tape according to an embodiment of the present invention, Figure 4 is a cross-sectional view taken along the line IV-VI 'of FIG.

3 and 4, the conductive double-sided tape 160 according to the embodiment of the present invention may be peeled off when the output pin of the auxiliary connector is connected to the signal pad electrode of the printed circuit board. ), A conductive layer 190 for connecting the output pin of the auxiliary connector and a signal pad electrode of the printed circuit board, and an insulating layer 200 for insulating each conductive layer 190.

The first peeling film 170 is coated on the entire lower surface to protect the lower surfaces of the conductive layer 190 and the insulating layer 200. The second peeling film 180 is coated on the entire upper surface to protect the upper surfaces of the conductive layer 190 and the insulating layer 200. The first and second peeling films 180 are made of a material such as polyethylene terephthalate. The first and second peeling films 180 are usually used to prevent foreign matter from adhering to the surfaces of the conductive layer 190 and the insulating layer 200 or to damage the conductive layer 190 and the insulating layer 200. When the conductive double-sided tape 160 is attached to the surface of the conductive layer 190 and the insulating layer 200 to the signal pad electrode, and the output pin is attached to the conductive layer 190 of the attached double-sided tape 160. Each is removed.

The conductive layer 190 includes a conductive polymer to impart conductivity and an adhesive to impart adhesion to the conductive layer 190. Polyaniline, polypyrrole, polythiophene, or the like may be used as the conductive polymer to impart conductivity to the conductive layer 190. In addition, all conductive polymers having derivatives such as polyaniline, polypyrrole, polythiophene, derivatives thereof, and the like can be used. Silicone, acrylic, epoxy, urethane, or the like may be used as the adhesive for imparting adhesion to the conductive layer 190.

However, when the output pin of the auxiliary connector is connected to the signal pad electrode of the printed circuit board by using the conductive double-sided tape 160, the operator may manually perform the misalignment, which may cause a short. There is this. To prevent this, as shown in FIG. 6, the width A of the conductive layer 190 is preferably smaller than the width B of the output pin 70 of the auxiliary connector or the signal pad electrode 110.

The insulating layer 200 is made of a material having insulation and adhesion to prevent a short between the conductive layers 190. As the insulating layer 200, silicon, acrylic, epoxy, urethane, or the like may be used.

Connection of the output pin of the auxiliary connector using the conductive double-sided tape 160 and the signal pad electrode of the printed circuit board is performed as shown in FIGS. 5 and 6.

5 is a perspective view illustrating a state in which an auxiliary connector according to an embodiment of the present invention is attached to a printed circuit board, and FIG. 6 is a cross-sectional view taken along line VI-VI ′ of FIG. 5.

Referring to FIGS. 5 and 6, the printed circuit board 90 may insulate the signal pad electrode 110 made of a metal layer and insulation between the signal pad electrodes 110 on a substrate 100 on which inner and outer raw materials are stacked. It includes a photo solder resist (Photo Imageable Solder Resist) (130).

The surface of the signal pad electrode 110 is exposed to be connected to the conductive layer 190 of the conductive double-sided tape 160. In addition, the signal pad electrode 110 is connected to the signal line and applies power from the output pin 70 of the auxiliary connector 10 to the signal line. The photo solder resist 130 is formed between the signal pad electrodes 110 to insulate the signal pad electrodes 110. The photo solder resist 130 is formed through exposure, development, and etching according to a mask pattern.

The conductive double-sided tape 160 is attached to the signal pad electrode 110. Here, the conductive layer 190 of the conductive double-sided tape 160 overlaps with the signal pad electrode 110. The output pin 70 of the auxiliary connector 10 is attached to the conductive double-sided tape 160. Here, the output pin 70 of the auxiliary connector 10 is overlapped and attached to the conductive layer 190 of the conductive double-sided tape 160. Through this, the power from the output pin 70 of the auxiliary connector 10 is applied to the signal pad electrode 110 via the conductive layer 190 of the conductive double-sided tape 160.

7 is a view for explaining a high voltage stress test method according to an embodiment of the present invention.

Referring to FIG. 7, first, the liquid crystal display 80 to be inspected through the high voltage stress is mounted on the cradle of the aging test driving device 210. Subsequently, the main connector 150 mounted on the printed circuit board 90 of the liquid crystal display device 80 and the main cable 230 connected to the aging test drive facility 210 are connected.

Subsequently, an output pin of the auxiliary connector 10 connected to the auxiliary cable 240 connected to the high voltage stress power board 220 is connected to the signal pad electrode of the printed circuit board 90 using a conductive double-sided tape. More specifically, after removing the first peeling film of the conductive double-sided tape, the conductive double-sided tape is attached on the signal pad electrode so that the signal pad electrode of the printed circuit board 90 and the conductive layer of the conductive double-sided tape overlap. Subsequently, after removing the second peeling film, the output pin of the auxiliary connector 10 connected to the auxiliary cable 240 connected to the high voltage stress power board 220 is attached to overlap the conductive layer of the conductive double-sided tape.

Subsequently, the aging test drive facility 210 is turned on to supply the test signal DATA from the aging test drive facility 210 to the liquid crystal display device 80 through the main connector 150, and the driving voltage VDD. ) Is supplied to the high voltage stress power supply board 220. In addition, the high voltage stress power supply board 220 is turned on to generate a high voltage stress drive voltage using the drive voltage VDD from the aging test drive facility 210, and then the output pins of the auxiliary connector 10 and the conductive double-sided tape. Is supplied to the liquid crystal display device 80 through the conductive layer. Then, the liquid crystal display 80 is driven by displaying the test signal DATA input through the main connector 150 using the high voltage stress driving voltage input through the auxiliary connector 10. At this time, the inspector inspects the image quality of the liquid crystal display device 80.

After the inspection, the power of the aging test drive facility 210 and the high voltage stress power supply board 220 is cut off, and the main cable 230 is detached from the main connector 150. In addition, the auxiliary connector 10 connected to the auxiliary cable 240 is detached from the conductive double-sided tape. Subsequently, the conductive double-sided tape is detached from the signal pad electrode of the liquid crystal display device 80.

Through such a method, a high voltage stress is applied to the plurality of liquid crystal display devices 80 to be inspected.

As described above, the inspection method of the conductive double-sided tape and the liquid crystal display device using the same according to the present invention improves the method of mounting the auxiliary connector on the printed circuit board of each liquid crystal display device using a high-voltage stress power board using the conductive double-sided tape Connect the output pin of the auxiliary connector connected to the auxiliary cable connected with and the signal pad electrode of the printed circuit board. That is, since a plurality of liquid crystal display devices can be inspected using one auxiliary connector, it is not necessary to mount the auxiliary connectors on each liquid crystal display device, thereby reducing the cost of the liquid crystal display device.

In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge of the present invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the spirit and scope of the art.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (9)

Conductive layers spaced at predetermined intervals and having an adhesive property; An insulating layer formed between the conductive layers and having an adhesive property; First and second peeling film to protect the conductive layer and the insulating layer, One side of the conductive layer is attached to a signal pad electrode of a printed circuit board of a liquid crystal display device for displaying an image; And the other side of the conductive layer is attached to an output pin of an auxiliary connector connected to an auxiliary cable connected to a power board for supplying a driving voltage to the liquid crystal display. The method of claim 1, And the power board is a high voltage stress power board for supplying a high voltage stress driving voltage to the liquid crystal display. The method of claim 1, The width of the conductive layer is a conductive double-sided tape, characterized in that less than the width of at least one of the signal pad electrode and the output pin. Attaching a conductive double-sided tape on the signal pad electrode of the printed circuit board of the liquid crystal display device; Attaching an output pin of an auxiliary connector connected to an auxiliary cable connected to a power board for supplying a driving voltage to the liquid crystal display device on the conductive double-sided tape; Inputting a test signal to a main connector of the liquid crystal display; And supplying the driving voltage to the liquid crystal display. The method of claim 4, wherein Attaching the conductive double-sided tape on the signal pad electrode And attaching the signal pad electrode and the conductive layer of the conductive double-sided tape to overlap each other. The method of claim 4, wherein Attaching the output pin on the conductive double-sided tape And attaching the conductive layer of the conductive double-sided tape and the output pin to overlap each other. The method according to claim 5 or 6, The width of the conductive layer is smaller than the width of at least one of the width of the signal pad electrode and the output pin. The method of claim 4, wherein And removing the first and second peeling films of the conductive double-sided tape. The method of claim 4, wherein And the power board is a high voltage stress power board for supplying a high voltage stress driving voltage to the liquid crystal display device.

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