KR102071203B1 - Fpc crack detacting device - Google Patents

Abstract

The present invention is a pedestal; A grip part positioned on the pedestal and fixing a boundary between a bonding part and a bending part of a flexible printed circuit (FPC); Located above the grip portion, and provides a flexible printed circuit crack detection device comprising a pressing portion for pressing the boundary portion of the FPC.

Description

Flexible Printed Circuit Crack Detection Device {FPC CRACK DETACTING DEVICE}

The present invention relates to a flexible printed circuit crack detection device, and more particularly, a detection device capable of detecting cracks in a flexible printed circuit by bending a boundary between a bonding portion and a bending portion of the flexible printed circuit in a reverse direction by using a pressurizing portion. It is about.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Recently, liquid crystal display (LCD), plasma display panel (PDP), and organic light emitting diodes Various flat panel displays (FPDs), such as organic light emitting diodes (OLEDs), have been utilized.

Among these flat panel display devices, liquid crystal display devices are widely used because they have advantages of miniaturization, light weight, thinness, and low power driving.

Such a flat panel display includes a display panel including a plurality of pixels to display an image, and a driver to apply a signal to each pixel of the display panel. The driving unit includes a printed circuit board (PCB) and is connected to one side of the display panel through a flexible printed circuit (FPC). The display panel 10 may be a liquid crystal display panel or an organic electroluminescent display panel.

1 is a cross-sectional view illustrating a portion of a conventional display device.

As shown in the drawing, the general display panel 10 includes a first substrate 12 and a second substrate 14 bonded to each other with a liquid crystal layer interposed therebetween.

A flexible printed circuit 20 (hereinafter referred to as FPC) that outputs various signal voltages for driving the display panel 10 along at least one edge of the first substrate 12 of the display panel 10 is provided. Connected to the rear surface of the display panel 10 to be in close contact with each other.

In addition, the FPC 20 includes a bonding unit 20a connected to the first substrate 12 of the display panel 10, a bending unit 20b for bending, and various shapes. It consists of a body unit (not shown) including the wiring and the electrical device, and a connector unit (not shown) for connecting to an external system.

The FPC 20 includes a base film 22 under the upper cover layer 21 and an upper cover layer 21, a plurality of signal wires 24 formed under the base film 22, and a signal. A lower cover layer 26 under the wiring 24. At this time, since the lower cover layer 26 is not formed in the bonding portion 20a, the signal wiring 24 is exposed, and the exposed signal wiring 24 is exposed to the display wiring (not shown) of the first substrate 12 and the ACF. (Anisotropic Conductive Film, not shown).

However, the display panel 10 to which the FPC 20 is connected has some problems.

2 is a cross-sectional view showing the disconnection caused by the bending of the conventional FPC.

As shown, in the step of modularizing the display device, the FPC 20 is bent to be disposed on the back or side of the modular display device, wherein the bending part 20b of the FPC 20 is connected to the bonding part 20a. It can be bent upwards and reverse bending can occur.

As described above, when the deflection in the reverse direction occurs, the lower cover layer 26 and the lower cover layer 26 located on the outermost side on the opposite side of the deflection direction of the FPC 20 are not formed, thereby exposing the signal wiring ( 24) a lot of tensile stress is applied. In this case, in particular, the signal wiring 24 made of a metal material generates cracks due to tensile stress.

In addition, the bending force of the ACF (not shown), which is a connection portion between the display panel 10 and the FPC 20, is weakened by the reverse bending of the FPC 20, and thus the boundary area between the bonding portion 20a and the bending portion 20b. Also, disconnection of the signal wiring 24 frequently occurs.

As a result, signal transmission may not be performed smoothly, resulting in poor driving operation of the display panel 10 or damage to the circuit unit.

Therefore, the FPC 20 without cracks should be mounted on the display panel 10. However, it is very difficult to visually check the cracks of the signal wiring 24, so that only the FPC 20 without cracks is displayed on the display panel 10. 10) is difficult to mount.

Therefore, when the FPC 20 having such a crack is mounted on the display panel 10, even if a defect occurs in a test process to be performed later, whether the defect is generated in the display panel 10 or not is generated in the FPC 20. Since it is difficult to confirm whether the FPC 20 is disposed together with the display panel 10, the process cost may be improved and the efficiency of the process may be reduced.

In addition, even if it is confirmed that the defect due to the FPC 20, it is very difficult to separate the FPC 20 mounted on the display panel 10 from the display panel 10, which also improves the process cost and process time.

Therefore, there is an urgent need for a solution to solve this problem.

The present invention is to solve the above problems, the first object is to easily determine whether the crack of the FPC.

In addition, the second purpose is to improve the reliability of the display device due to the use of FPC without disconnection.

For this reason, it is possible to lower the waste rate of the FPC and to improve the process efficiency.

In order to achieve the above object, the flexible printed circuit crack detection apparatus of the present invention, the pedestal; A grip part positioned on the pedestal and fixing a boundary between a bonding part and a bending part of a flexible printed circuit (FPC); Located on the grip portion, and includes a pressing portion for pressing the boundary of the FPC.

The grip part may include a first fixing part in which a first protrusion is formed and a second fixing part in which a second protrusion is formed, and the FPC is fixed by the first and second protrusions.

The pedestal is formed with a first seating groove to seat the grip portion.

The second fixing part is coupled to allow sliding movement toward the first fixing part.

The pressing part includes a first pressing part and a second pressing part,

The first pressing portion is composed of a support and a bending portion vertically bent from the support toward the second pressing portion,

The second pressing part may slide toward the first pressing part, and the roller may be inserted into the bent part of the first pressing part.

The inner side of the bent portion is formed to be inclined to become thinner toward the end, characterized in that to further press the second pressing portion in the direction of gravity.

A locking protrusion for determining a position of the second pressing part is further formed on the second fixing part, and the second pressing part further includes a hole in which the locking protrusion of the second fixing part is caught. .

It further comprises a position adjusting screw for adjusting the position of the grip portion to secure the FPC to the other side of the second fixing portion.

The pressing unit includes a pressing jig and a handle.

The pressing jig has a 'b' shape including a first jig having a rectangular plate shape and a second jig formed to protrude perpendicularly to an edge thereof, and the second jig of the pressing jig is rotated to cover the grip part and is FPC. It is characterized in that to pressurize.

In the flexible printed circuit crack detection apparatus according to the present invention, the FPC bending part before assembly may be bent to determine whether cracks are generated. Therefore, it is possible to detect whether the crack of the FPC in advance, there is an effect that can further increase the completeness of the finished product.

Therefore, the reliability and process efficiency of the display device can be improved.

1 is a cross-sectional view illustrating a portion of a conventional display device.
2 is a cross-sectional view showing disconnection caused by bending of a conventional flexible printed circuit.
3 is a perspective view showing a flexible printed circuit crack detection apparatus according to a first embodiment of the present invention.
4 is a cross-sectional view of FIG. 3.
5A and 5B are diagrams illustrating a method of inspecting cracks in a state in which FPC is fixed to a flexible printed circuit crack detection apparatus according to a first embodiment of the present invention.
6 is a perspective view of a flexible printed circuit crack detection apparatus according to a second embodiment of the present invention.
7 is a front view of a flexible printed circuit crack detection apparatus according to a second embodiment of the present invention.

Typical display devices include a display panel and a flexible printed circuit (FPC).

The display panel includes a first substrate and a second substrate that are bonded to each other with the liquid crystal layer interposed therebetween.

An FPC that outputs various signal voltages for driving the display panel is connected along at least one edge of the first substrate of the display panel so as to be properly flipped and adhered to the rear surface of the display panel.

Here, the FPC includes an upper cover layer, a lower cover layer, and a plurality of signal wires formed under the base film, having a base film having a flexible characteristic therebetween.

In this case, the display device of the present invention allows the FPC, which has been tested by using a flexible printed circuit crack detection device, to be connected to the display panel so that the bending portion of the FPC is bent upward with respect to the bonding portion in the step of modularizing the display device. Even if warpage occurs, it is possible to minimize the disconnection of the signal wiring of the FPC.

That is, the flexible printed circuit crack detection apparatus of the present invention can extract the FPC having rigidity in the reverse bending, so that the high rigidity FPC can be attached to the display panel.

Therefore, the disposal rate of the FPC can be lowered, so that the process efficiency can be improved, and as a result, the completeness of the finished product can be further increased, thereby improving the reliability and process efficiency of the display device.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

3 is a perspective view illustrating a flexible printed circuit crack detection apparatus according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view of FIG.

As illustrated, the flexible printed circuit crack detection apparatus 100 according to the first embodiment of the present invention includes a pedestal 110, a grip part 120, and a pressing part 130, and easily performed by a worker. It can be used on a table to do this.

Looking at each of them in more detail, the pedestal 110 includes a plate 112 for supporting the grip portion 120 and the pressing portion 130, the first seating groove 118 is formed on the plate 112 do.

The grip part 120 serves to fix the FPC (300 in FIG. 5A) in the flexible printed circuit crack detection device 100 and includes first and second fixing parts 122 and 124.

Here, the first and second fixing parts 122 and 124 are seated so as to correspond to each other at a predetermined interval apart from the first mounting groove 118 of the pedestal 110, the second fixing part in the first fixing part 122 The first protrusion 125 is formed to protrude at an upper side corner facing the 124, and the second fixing portion 124 substantially holds the FPC (see 300 in FIG. 5A) together with the first protrusion 125. The second protrusion 127 is configured toward the first protrusion 125.

Accordingly, the first protrusion 125 and the second protrusion 127 formed to face each other form a grip, and the FPC (see 302 of FIG. 5A) of the FPC (see 300 of FIG. 5A) is positioned upward. The boundary between the bonding portion (see 302 of FIG. 5A) and the bending portion (see 304 of FIG. 5A) of FIG. 5A 300 is fixed (see 306 of FIG. 5A).

On the other hand, when fixing the FPC (refer to 300 of FIG. 5A) there is a problem that it is difficult for the operator to put his hand in the gap between the first and second protrusions (125, 127) is narrow. Accordingly, the 'c'-shaped groove 121 that may facilitate fixing of the FPC (see 300 of FIG. 5A) may be formed under the first protrusion 125.

In addition, a second seating groove 123 is formed at an upper portion of the first fixing part 122.

In addition, the second fixing part 124 is coupled on the pedestal 110 so as to slide back and forth toward the first fixing part 122. At this time, on the other side of the second fixing part 124, a position adjusting screw 128 that can adjust the position of the second fixing part 124 is formed. One end of the position adjusting screw 128 is formed to handle the operator. In addition, a locking protrusion (not shown) is formed at an upper center of the second fixing part 124.

On the other hand, the pressing unit 130 is the first pressing part 132 located in the second seating groove 123 on the upper part of the first fixing part 122 and the second pressing part located on the upper part of the second fixing part 124. The second pressing part 136 is coupled to the second fixing part 124 to allow the sliding movement back and forth toward the first pressing part 132.

In addition, the first pressing part 132 includes a support part 132a seated in the second seating groove 123 and a bent part 132b vertically bent from the support part 132a toward the second pressing part 136. .

At this time, the bent portion 132b is formed on the first and second protrusions 125 and 127.

In addition, the second pressing part 136 has an opening corresponding to the roller 134 on one side, and moves back and forth while supporting the roller 134.

At this time, the second pressing portion 136 is slid toward the first pressing portion 132, the bonding portion of the FPC (see 300 of FIG. 5A) fixed to the grip portion 120 through the roller 134 (FIG. 5A) (See 302).

Thus, the bonding portion (see 302 in FIG. 5A) of the FPC (see 300 in FIG. 5A) is bent from the bending portion (see 304 in FIG. 5A) toward the first pressing portion 132.

The roller 134 presses the bonding portion (see 302 of FIG. 5A) of the FPC (300 of FIG. 5A) fixed by the grip portion 120. The material of the roller 134 may be urethane.

Here, the inside of the bent portion 132b that is bent from the support portion 132a is formed to be inclined so as to become thinner toward the end.

Accordingly, when the pressing unit 130 moves the roller 134 of the second pressing unit 136 when the crack detection test is performed by the inside of the bent portion 132b formed to be inclined, the roller 134 may be removed. 1, the pressing portion 132 enters along the oblique line formed inside the bent portion 132b to further press the roller 134 in the direction of gravity can effectively proceed crack detection test, further improve the reliability Can be.

In addition, the second pressing portion 136 includes a roller 134 and a handle 138, the hole 137 that can be positioned in the upper position is formed.

Therefore, the locking protrusion (not shown) may be confirmed through the hole 137, and thus the position of the second pressing part 136 may be maintained.

In this way, by bending the FPC (see 300 of FIG. 5A), it is possible to confirm whether or not the crack of the FPC (300 of FIG. 5A) occurs.

Therefore, the flexible printed circuit crack detection apparatus 100 according to the first embodiment of the present invention can extract an FPC (see 300 in FIG. 5A) having rigidity in reverse bending, and therefore, has a high rigidity FPC (300 in FIG. 5A). Reference) may be attached to the display panel (not shown).

In addition, the locking protrusion (not shown) can control the position of the second pressing part 136, so that the crack detection test can be performed at a constant position regardless of the operator's deviation, thereby further increasing the reliability of the test.

5A and 5B are diagrams illustrating a method of detecting cracks in the FPC 300 by the flexible printed circuit crack detection apparatus 100 according to the first embodiment of the present invention.

As shown in FIG. 5A, the bonding portion 302 of the FPC 300 is positioned upward between the first fixing portion 122 and the second fixing portion 124 of the grip portion 120 through the above-described device. After placing the boundary portion 306 between the bonding portion 302 and the bending portion 304 of the FPC 300, the second fixing portion 124 is moved through the positioning screw 128 to move the first and the first portions. 2 Fix the FPC 300 through the protrusions (see 125 and 127 of FIG. 4).

Here, the FPC 300 is fixed to the FPC 300 such that the lower cover layer is not formed in the bonding portion 302 of the FPC 300 so that the exposed portion of the signal wiring faces the second pressing portion 136. The test should be carried out to determine whether it has rigidity against reverse bending.

Thereafter, as shown in FIG. 5B, the second pressing portion (132) enters into the bent portion of the first pressing portion 132 (see 132b of FIG. 3) of the roller 134 of the second pressing portion 136. 136 is moved, and the bonding unit 302 of the FPC 300 is pressed at an angle close to 90 degrees, and then held for about 5 seconds to test.

After the test proceeds, the second pressing part 136 moves to the original position, and then determines whether cracks are generated at the boundary part 306 of the FPC 300 through a microscope.

Thereafter, the cracked FPC 300 is disposed of, and the cracked FPC 300 is mounted on the display panel by proceeding to the next process.

Hereinafter, a flexible printed circuit crack detection apparatus 200 according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, the description of the overlapping parts from the first embodiment of the present invention is replaced by the description in the first embodiment of the present invention.

6 is a perspective view of a flexible printed circuit crack detection apparatus according to a second embodiment of the present invention, and FIG. 7 is a cross-sectional view of a flexible printed circuit crack detection apparatus according to a second embodiment of the present invention.

As shown, the form of the flexible printed circuit crack detection apparatus 200 according to the second embodiment of the present invention includes a pedestal 210, the grip portion 220 and the second pressing portion 230, of which The pedestal and grip portion 220 is the same as the configuration of the FPC crack detection device 100 in the first embodiment of the present invention above.

In the second embodiment of the present invention, the second pressing portion 230 located above the grip portion 220 includes a pressing jig 232 and the handle 234, wherein the pressing jig 232 has a rectangular plate shape It has a 'b' shape comprising a first jig (232a) and a second jig (232b) of a shape projecting perpendicular to the edge thereof.

Here, the handle 234 may perform the role of the rotating shaft at the same time.

In this case, although the second pressing portion 230 having a 'b' shaped pressing jig 232 is shown, the second pressing portion 230 is a FPC (see 300 of FIG. 5A) fixed to the grip portion 220. Within the pressable shape, the second pressing part 230 having various shapes may be formed regardless of the shape.

The FPC (300 in FIG. 5A) is positioned so that the bonding portion (see 302 in FIG. 5A) of the FPC (see 300 in FIG. 5A) is positioned upward in the first fixing portion 222 and the second fixing portion 224 of the grip portion 220. After fixing the boundary (see 306 of FIG. 5A), the second jig 232b of the pressing jig 232 covers the grip portion 220 to which the FPC (300 of FIG. 5) is fixed. Rotate the pressing unit 230 above the grip unit 220, press the bonding portion (see 302 in FIG. 5A) of the FPC (see 300 in FIG. 5) at an angle close to 90 degrees, and hold the microscope for about 5 seconds. Through this, it is determined whether a crack occurs at the boundary (see 306 of FIG. 5A).

As described above, using the flexible printed circuit crack detection device according to an embodiment of the present invention can determine the presence of cracks in the FPC in the FPC state before assembly, it is possible to replace only the FPC in the case of a crack can reduce the manufacturing cost Can improve the completeness of the product.

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

100: flexible printed circuit crack detection device 110: pedestal
112: plate 118: first seating groove
120: grip portion 121: '''home
122: first fixing part 123: second seating groove
124: second fixing portion 125: first protrusion
127: second projection 128: position adjusting screw
130: pressing portion 132: first pressing portion
132a: support portion 132b: bend portion
134: roller 136: second pressing part
137: hole 138: handle
200: flexible printed circuit crack detection device 210: pedestal
212 plate 214 guide wall
218: first seating groove 220: grip part
221: groove '222' 222: first fixing part
224: second fixing portion 225: first protrusion
227: second projection 228: position adjusting screw
230: second pressing portion 232: pressing jig
232a: first jig 232b: second jig
234:: Handle
300: FPC 302: bonding part
304: bending part 306: boundary part

Claims (11)

A pedestal;
A grip part positioned on the pedestal and fixing a boundary between a bonding part and a bending part of a flexible printed circuit (FPC);
Located on the grip portion, and includes a pressing portion for pressing the boundary of the FPC,
The pressing part includes a first pressing part and a second pressing part,
The first pressing portion is composed of a support and a bending portion vertically bent from the support toward the second pressing portion,
And the second pressing portion includes a roller, and the roller is inserted into the bent portion of the first pressing portion by sliding toward the first pressing portion.
The method of claim 1,
The grip part includes a first fixing part in which a first protrusion is formed and a second fixing part in which a second protrusion is formed, and the FPC is fixed by the first and second protrusions. Detection device.
The method of claim 1,
And a first mounting groove is formed in the pedestal so that the grip part is seated.
The method of claim 2,
And the second fixing part is coupled to be slidably moved toward the first fixing part.
delete The method of claim 1,
The inner side of the bent portion is formed to be inclined so as to become thinner toward the end, and when the second pressing portion slides toward the first pressing portion, the roller moves along an oblique line inside the bent portion, and the second pressing portion is moved toward the gravity direction. Flexible printed circuit crack detection device characterized in that the pressing.
The method of claim 1,
A locking protrusion for determining a position of the second pressing part is further formed on the second fixing part, and the second pressing part further includes a hole in which the locking protrusion of the second fixing part is caught. Flexible printed circuit crack detection device, characterized in that.
The method of claim 2,
And a position adjusting screw for adjusting the position of the grip portion to fix the FPC to the other side of the second fixing portion.
A pedestal;
A grip part positioned on the pedestal and fixing a boundary between a bonding part and a bending part of a flexible printed circuit (FPC);
It is located on the grip portion and presses the boundary of the FPC, and consists of a pressing portion including a pressing jig and a handle,
The pressing jig has a 'b' shape including a first jig having a rectangular plate shape and a second jig formed to protrude perpendicularly to an edge thereof, and the second jig of the pressing jig is rotated to cover the grip part and is FPC. Flexible printed circuit crack detection device, characterized in that for pressing. delete 10. The flexible printed circuit crack detection apparatus according to claim 1 or 9, further comprising a microscope for checking the occurrence of cracks at the boundary of the FPC.

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