JPH0659269A - Method for testing electric connection of liquid crystal display panel unit - Google Patents

Abstract

PURPOSE:To test connection resistance between an electrode terminal formed on a liquid crystal panel and a conductive pattern terminal formed on an insula tion film before a unit is completed. CONSTITUTION:A lot of pieces of electrode terminals 2 and dummy terminals 7 are formed on the liquid crystal panel 1. On a TAB film (insulation film) 3, conductive patterns opposite to the electrode terminals 2, the dummy electrodes 8 opposite to the dummy electrodes 7 and pads 9 communicating with time dummy electrodes 8 are formed by connection parts (one ends) 4. The display panel 1 and the TAB film 3 are connected with an anisotropy conductive film. Instead of measuring a contact resistance between the electrode terminal 2 and the conductive pattern connection part 4, the contact resistance between the dummy electrodes 7, 8 is measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for testing the electrical connection of a liquid crystal display panel unit, and more particularly to a method for indirectly measuring the contact resistance between electrode terminals formed on a liquid crystal display panel and conductor patterns formed on an insulating film. .

[0002]

2. Description of the Related Art There are several methods for connecting a liquid crystal display panel and its driving circuit. The most widely used method at present is to mount a liquid crystal driving IC on an insulating film (TAB film) formed with a large number of conductor patterns, and to form a large number of fine conductive particles between the liquid crystal display panel and the TAB film. Anisotropic conductive films diffused in resin are sandwiched and joined by thermocompression bonding.

FIG. 7 is a sectional view of a circuit connection using an anisotropic conductive film. A large number of electrode terminals 2 are formed on the liquid crystal display panel 1, and the electrode terminals 2 are formed on a TAB film (insulating film) 3 on which a liquid crystal driving IC (not shown) is mounted.
Anisotropic conductive film 6 in which conductive patterns (4) facing each other are formed and a large number of fine conductive particles 5 are diffused
Is sandwiched between the display panel 1 and the TAB film 3.

Thereafter, when the TAB film 3 is pressed against the display panel 1 and cooled to room temperature while being heated to a temperature at which the resin base material of the anisotropic conductive film 6 is melted, the electrode terminal 2 and one end of the conductor pattern (connection) are connected. Part 4) is electrically connected by conductive particles 5 sandwiched therebetween, and the connection is maintained by the adhesive force of the conductive film 6 and the compressive stress associated with curing.

[0005]

Generally, the contact resistance of the anisotropic conductive film is somewhat different depending on its type, but normally connected films are several hundred mΩ to several Ω. However, the contact resistance when the curing reaction of the resin of the anisotropic conductive film is advanced, the parallelism of the thermocompression bonding device is poor, and the liquid crystal display panel and the TAB film are inclined in the thickness direction,
It becomes several Ω to several tens Ω. It is necessary to detect such a difference, but the resistance of the conventional measurement system is several tens of Ω to several hundreds if all of the resistance of the electrode terminals of the liquid crystal display panel, the terminal resistance of the TAB film, the resistance of the probe of the tester, etc. are included. Becomes Ω.

Therefore, even if a connection failure (excessive contact resistance) occurs due to an abnormality in the thermocompression bonding for connecting the liquid crystal display panel and the TAB film, the anisotropic conductive film, the TAB film, the liquid crystal display panel, etc. I couldn't tell if there was a poor connection until the unit was completed.

Further, even if a display failure occurs in the drive test of the unit, there is no effective method for checking whether the connection between the liquid crystal display panel and the TAB film is poor, and the appearance of each connection portion is optically observed with a microscope. Although it was determined whether or not it was defective, some of the electrode terminals of the liquid crystal display panel are opaque, and these are difficult to detect optically.

As described above, the liquid crystal display panel and the T
The test of the connection portion with the AB film has a problem that the work time is large and the productivity is impaired. With the mass production of the liquid crystal display panel, countermeasures against it have been demanded.

[0009]

FIG. 1 is an explanatory view of the basic constitution of the method of the present invention. A large number of electrode terminals 2 and dummy electrodes 7 are formed on a liquid crystal display panel 1, and a TAB film (insulating film) is formed. 3, a connection part (one end) 4 is formed with a conductor pattern facing the electrode terminal 2, a dummy electrode 8 facing the dummy electrode 7, and a pair of pads 9 communicating with the dummy electrode 8.

Therefore, the display panel 1 and the TAB film 3
An anisotropically conductive film (6) is sandwiched between and, and the TAB film 3 is pressed toward the display panel 1 with a heating presser. Then, the display panel 1 and the TAB film 3 are joined by an anisotropic conductive film, and instead of measuring the contact resistance between the electrode terminal 2 and the conductor pattern connecting portion 4, a pair of pads 9 is used to replace the dummy electrodes 7 and 8 with each other. Measure the contact resistance.

The measured value R is the contact resistance between the dummy electrodes 7 and 8 connected through the anisotropic conductive member R _S , the specific resistance of the dummy electrode 7 R _P , and the specific resistance of the dummy electrode 8 communicating with it. When R _T , R = R _S + R _P + R _T.

Therefore, if the specific resistances R _P and R _T are measured in advance, it is possible to know the contact resistance R _S from the measured resistance value R. Since the contact resistance R _S differs depending on the configuration (material) of the dummy electrodes 7 and 8, the dummy electrode 7 has the same configuration as the electrode terminal 2, and the dummy electrode 8 has the same configuration as the connection portion 4. By using the same shape and size, the accuracy of estimating the contact resistance between the electrode terminal 2 and the conductor pattern 4 from the contact resistance R _S is improved.

[0013]

According to the above means, the dummy electrodes not connected to the circuit are formed in the liquid crystal display panel unit, and the display panel and the TA are connected.
The contact resistance of the dummy electrode is measured instead of the connection with the B film. Therefore, it is possible to form a pair of pads that contact the probe of the measuring instrument, flow a current for contact resistance measurement, and measure the resistance value of the measurement system excluding the contact resistance to be measured, and the contact portion between the display panel and the TAB film. To be able to accurately and swiftly judge the quality of.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is an explanatory view of the essential parts of the first embodiment of the method of the present invention, FIG. 3 is an explanatory drawing of the essential parts of the second embodiment of the present invention, and FIG. Of the third embodiment of the present invention, FIG. 5 shows the fourth embodiment of the method of the present invention.
6 is an explanatory view of an electrode terminal according to the embodiment of the present invention, and FIG. 6 is an explanatory view of an electrode terminal according to the fifth embodiment of the method of the present invention.

In FIG. 2, (A) is a plan view of the electrode terminals and the dummy electrodes formed on the liquid crystal display panel, (B) is a plan view of the connection portions of the conductor patterns and the dummy electrodes formed on the TAB film, and (C). Is an equivalent circuit of a contact resistance measuring system using dummy electrodes.

In FIG. 2A, in a liquid crystal display panel 1 in which a pair of glass substrates are bonded and liquid crystal is filled in the bonding gap, the pixel electrodes are transparent in the case of the TFT system formed on the glass substrates, but the others are opaque. A plurality of electrode terminals 2 communicating with the electrodes and a first dummy electrode 7 which is arranged at both ends of the electrode terminals 2 aligned at a constant pitch and wider than the electrode terminals 2.
Form ₁ , 7 ₂ .

In FIG. 2B, a TAB film (insulating film) 3 on which an IC chip (not shown) is mounted has one end (connecting portion) 4 facing the electrode terminal 2 and the other end connected to an IC chip (not shown). a plurality of conductive patterns, the dummy electrodes 7 _1, 7 ₂ of the pair of second dummy electrodes 8 opposite to each _1, 8 _2, the pad 9 _1, 9 ₂ communicating with each dummy electrode _81, 82 Form.

A connection system in which dummy electrodes 7 ₁ , 7 ₂ and 8 ₁ , 8 ₂ are connected by an anisotropic conductive connecting member (for example, an anisotropic conductive film) for connecting the electrode terminal 2 and the conductor pattern connecting portion 4 When the resistance value R ₁ is measured with the pads 9 ₁ and 9 ₂ , as shown in FIG. 2C, the dummy electrodes 7 ₁ and 7 ₂ and 8 ₁ and 8 _{2 which} are in contact with each other through the anisotropic conductive connecting member are connected. When the contact resistance is R _S , the specific resistance of the dummy electrodes 7 ₁ and 7 ₂ is R _P, and the specific resistance of the dummy electrodes 8 ₁ and 8 ₂ is R _T , the resistance value R ₁
= R _S + R _P + R _T.

[0019] Therefore, if the resistance value R _P and R _T measured in advance, it becomes possible to know the contact resistance R _S than the measured value R, connection resistance of the connection portion 4 electrode terminal 2 and from the contact resistance R _S is Presumed.

Contact resistance R_SIs the dummy electrode 7₁, 7₂, 8₁,
8₂Depends on the configuration (material). Therefore, the dummy electrode
7₁, 7₂And the dummy electrode 8
₁, 8 ₂Make the configuration of the connection part 4 the same, and further they
By sharing the shape and dimensions of the
The contact resistance with the connecting portion 4 is the contact resistance R_SThe accuracy estimated from
improves.

In the embodiment of FIG. 2, the dummy electrode 7
₁ , 7 ₂ , 8 ₁ , and 8 ₂ are provided at both aligned ends of the electrode terminal 2 and the connecting portion 4. This is because when the display panel 1 and the insulating film 3 are connected by crimping, the inclination in the thickness direction thereof is detected. 7 ₁ or 7 ₂ and 8 ₁ and 8 ₂ to be connected thereto are unnecessary.

In FIG. 3, (A) is a plan view of the electrode terminals and the dummy electrodes formed on the liquid crystal display panel, (B) is a plan view of the connection portions of the conductor patterns and the dummy electrodes formed on the TAB film, and (C). Is an equivalent circuit of a contact resistance measuring system using dummy electrodes.

In FIG. 3A, a liquid crystal display panel 1 in which a pair of glass substrates are bonded and liquid crystal is filled in the bonding gap is provided with a large number of electrode terminals 2 communicating with transparent electrodes formed on the glass substrates. First dummy electrodes 71 ₁ and 71 having the same width as the electrode terminals 2 are provided at both ends of the electrode terminals 2 aligned at a pitch.
₂ and the dummy electrodes 71 ₁ and 71 ₂ communicate with a pair of pads 10 ₁ and 10
Form ₂ .

In FIG. 3B, a TAB film (insulating film) 3 on which an IC chip (not shown) is mounted has one end (connecting portion) 4 facing the electrode terminal 2 and the other end connected to an IC chip (not shown). a plurality of conductive patterns are formed with a pair of opposed second dummy electrodes _81, 82 to the dummy electrodes 71, the dummy electrodes 8 _1, a pair of pads 9 which communicates with the 8 _{2 1} 9 _2.

A connection system in which the dummy electrodes 71 ₁ , 71 ₂ and 8 ₁ , 8 ₂ are connected by an anisotropic conductive connecting member (for example, an anisotropic conductive film) for connecting the electrode terminal 2 and the conductor pattern connecting portion 4 The resistance value R ₂ is, as shown in FIG. 3 (C), the dummy electrodes 71 ₁ , 71 ₂ and 8 ₁ , 8 which are in contact with each other through the anisotropic conductive connecting member.
₂ of the contact resistance and R _S, the resistivity of the dummy electrodes 71 _1, 71 ₂ and R _P1, R _P2, the dummy electrodes _81, 82 of the resistivity and R _T1, R _T2, for example from the pad 9 ₂ When a constant current I ₁ is passed through the pad 10 ₁ and the voltage is measured at the pads 9 ₁ and 10 ₂ , the pad 9 ₁ and the intermediate point 9 ₁ ′, and the pad 10 ₂ and the intermediate point 10 ₂ ′ are measured. Current does not flow through pad 9 ₁
And the intermediate point 9 ₁ ′ _{, the} pad 10 ₂ and the intermediate point 10 ₂ ′ have the same potential.

Therefore, the voltage measured at the pads 9 ₁ and 10 ₂ becomes equal to the voltage between the intermediate points 9 ₁ ′ and 10 ₂ ′, and if the voltage at this time is V ₁ , then R _S = The contact resistance R _S is accurately measured by V ₁ / I ₁ .

The contact resistance R _S is the dummy electrodes 71 ₁ , 71 ₂ , 8 ₁ , 8
Depends on the configuration (material) of ₂ . Therefore, the dummy electrode 71
The configuration of ₁ , 71 ₂ is the same as that of the electrode terminal 2, and the dummy electrodes 8 ₁ ,
It is desirable that the structure of 8 _{2 be} the same as that of the connecting portion 4 and that their shapes and dimensions are made common.

In the embodiment of FIG. 3, the dummy electrode 71
₁ , 71 ₂ , 8 ₁ , and 8 ₂ are provided at both aligned ends of the electrode terminal 2 and the connecting portion 4. This is to detect the inclination (parallelism) in the thickness direction of the display panel 1 and the insulating film 3 when they are connected by pressure bonding. One of the dummy electrodes 71 ₁ and 71 ₂ and the dummy electrode 8 ₁ or 8 ₂ to be connected thereto are unnecessary.

In FIG. 4, (A) is a plan view of the electrode terminals and the dummy electrodes formed on the liquid crystal display panel, (B) is a plan view of the connection portions of the conductor patterns and the dummy electrodes formed on the TAB film, and (C). Is an equivalent circuit of a contact resistance measuring system using dummy electrodes.

In FIG. 4 (A), a liquid crystal display panel 1 in which a pair of glass substrates are bonded and liquid crystal is filled in the bonding gap is provided with a large number of electrode terminals 2 communicating with transparent electrodes formed on the glass substrates. First dummy electrodes 72 ₁ , which are arranged at both ends of the electrode terminals 2 aligned at a pitch and are wider than the electrode terminals 2,
72 ₂ and dummy electrodes 72 ₁ and 72 ₂ are formed.

In FIG. 4B, a TAB film (insulating film) 3 on which an IC chip (not shown) is mounted has one end (connecting portion) 4 facing the electrode terminal 2 and the other end connected to an IC chip (not shown). A large number of conductor patterns, three second dummy electrodes 8 ₁ , 8 ₂ and 8 ₃ facing the dummy electrodes 72 ₁ and 72 ₂ respectively, and communication with the dummy electrodes 8 ₁ , 8 ₂ and 8 ₃ respectively. Pads 9 ₁ , 9 ₂ and 9 ₃ are formed.

The dummy electrodes 71 ₁ , 71 ₂ and 8 ₁ , 8 ₂ , 8 ₃ are connected by an anisotropic conductive connecting member (for example, an anisotropic conductive film) which connects the electrode terminal 2 and the conductor pattern connecting portion 4. As shown in FIG. 4C, the resistance value R ₃ of the connection system is the dummy electrodes 71 ₁ , 71 ₂ and 8 which are in contact with each other through the anisotropic conductive connection member.
The contact resistances of ₁ , 8, ₂ and 8 ₃ are R _S1 , R _S2 and R _S3, and the specific resistance of the dummy electrodes 71 ₁ and 71 ₂ between the opposing dummy electrodes 8 ₁ and 8 ₂ is R _P1 and the dummy electrode 8 The specific resistance of the dummy electrodes 71 ₁ and 71 ₂ between ₂ and 8 ₃ facing each other is R _P2 (≈R _P1 ).
And the specific resistance of the dummy electrodes 8 ₁ , 8 ₂ , and 8 ₃ is R _T1, R
Let _{T2 and} R _T3 , for example, when a constant current I ₂ is passed from the pad 9 ₃ to the pad 9 ₂ and the voltage is measured at the pads 9 ₁ and 9 ₂ ,
Between the pad 9 ₁ and the midpoint 9 ₁ 'becomes the same potential, no current flows, the voltage measured at the pad 9 _1, 9 _2, the pad 9 ₂
Is equal to the voltage between the intermediate point 9 ₁ ′ and the intermediate point 9 ₁ ′. If the voltage at this time is V ₂ , then R ₃ = V ₂ / I ₂ .

Also, R₃= R_S2+ R_T2Therefore, R_T2
If you measure in advance, contact resistance R _S2Is estimated. Contact
Touch resistance R_S1, R_S2, R_S3Is the dummy electrode 72₁, 72₂, 8₁, 8₂,
8₃Depends on the configuration (material). Therefore, the dummy electrode
72₁, 72₂And the dummy electrode 8
₁, 8₂, 8₃The same as the connection section 4, and
By making their shapes and dimensions common, the electrode terminal 2
And the contact resistance between the connection part 4 and the contact resistance R _SEstimated from
The degree improves.

In the embodiment of FIG. 4, the dummy electrode 72
₁ , 72 ₂ , 8 ₁ , 8 ₂ , and 8 ₃ are provided at both aligned ends of the electrode terminal 2 and the connecting portion 4. This is to detect the inclination (parallelism) in the thickness direction of the display panel 1 and the insulating film 3 when they are connected by pressure bonding. One of the dummy electrodes 72 ₁ and 72 ₂ and the dummy electrodes 8 ₁ , 8 ₂ and 8 ₃ to be connected thereto are unnecessary.

In FIG. 5, a liquid crystal display panel 1 in which a pair of glass substrates are bonded and liquid crystal is filled in the bonding gap is
U-shaped dummy electrodes 73 ₁ and 73 ₂ are formed at both aligned ends of a large number of electrode terminals 2 communicating with transparent electrodes formed on a glass substrate and the electrode terminals 2 aligned at a constant pitch.

Dummy electrodes 73 ₁ and 73 ₂ connected to the dummy electrodes 8 ₁ and 8 ₂ shown in FIG. 2B are U-shaped in which a pair of conductor pieces 11 having the same width and pitch as the electrode terminals 2 are connected. Therefore, by using the conductor piece 11 and the dummy electrodes 8 ₁ and 8 ₂ , it becomes easy to align the liquid crystal display panel 1 and the TAB film 3.

In FIG. 6, a liquid crystal display panel 1 in which a pair of glass substrates are bonded and liquid crystal is filled in the bonding gap is
U-shaped dummy electrodes 74 ₁ and 74 ₂ are formed at both aligned ends of a large number of electrode terminals 2 communicating with transparent electrodes formed on a glass substrate and the electrode terminals 2 aligned at a constant pitch.

The dummy electrodes 74 ₁ and 74 _{2 to which the} dummy electrodes 8 ₁ , 8 ₂ and 8 ₃ shown in FIG. 4B are connected are connected to three conductor pieces 11 having the same width and pitch as the electrode terminals 2. It is a Y-shaped
By using the conductor piece 11 and the dummy electrodes 8 ₁ , 8 ₂ , and 8 ₃ , it becomes easy to align the liquid crystal display panel 1 and the TAB film 3 with each other.

[0039]

As described above, according to the method of the present invention, the dummy electrode not connected to the circuit is formed in the liquid crystal display panel unit, and the contact resistance of the dummy electrode is measured in place of the connection between the display panel and the TAB film. With this configuration, it is possible to accurately and promptly determine the quality of the contact portion between the display panel and the TAB film, improve the productivity of the liquid crystal display panel unit, and contribute to the improvement of display quality.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a basic configuration of a method of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration in a first embodiment of the method of the present invention.

FIG. 3 is an explanatory diagram of a main part configuration in a second embodiment of the method of the present invention.

FIG. 4 is an explanatory diagram of a main part configuration in a third embodiment of the method of the present invention.

FIG. 5 is an explanatory view of an electrode terminal according to a fourth embodiment of the method of the present invention.

FIG. 6 is an explanatory view of an electrode terminal according to a fifth embodiment of the method of the present invention.

FIG. 7 is a cross-sectional view of a circuit connection using an anisotropic conductive film.

[Explanation of symbols]

1 is a liquid crystal display panel 2 is an electrode terminal formed on the display panel 3 is an insulating film (TAB film) 4 is one end (connection end) of a conductor pattern formed on the TAB film 6 is an anisotropic conductive member (anisotropic conductive film) ) is 7,7 _1, 7 _2, 71 _1, 71 _2, 72 _1, 72 _2, 73 _1, 73 _2, 74 _1, 74 _{2 1} first dummy electrodes 8, 8, 8 _2, 8 ₃ a 2 dummy electrodes 9,9 ₁ , 9, ₂ , 10 ₁ , 10 ₂ , are pads

Claims (6)

[Claims] 1. A liquid crystal display panel (1) and the display panel
In the liquid crystal display device unit in which an insulating film (3) having a conductor pattern whose one end (4) is connected to the electrode terminal (2) of (1) is connected by an anisotropic conductive member, the display panel (1) a first dummy electrode (7,7 _1, 7 ₂₎ provided on,
The insulating film (3) has a pair of second dummy electrodes (8, 8) connected to the first dummy electrode via the anisotropic conductive member.
₁ , 8 ₂ ), and the electrode terminal (2) and one end of the conductor pattern
(4) Instead of measuring contact resistance with the first dummy electrode
A method for testing electrical connection of a liquid crystal display panel unit, comprising measuring the contact resistance between (7,7 ₁ , 7 ₂ ) and the second dummy electrode (8,8 ₁ , 8 ₂ ). 2. A liquid crystal display panel (1) and the display panel
Conductor pattern where one end (4) connects to the electrode terminal (2) of (1)
The insulating film (3) on which the
In the liquid crystal display device unit connected by
The display panel (1) has a first dummy electrode (71₁, 71₂) And the first
Dummy electrode (71₁, 71₂) To a pair of pads (10₁, 1
0₂) Is provided, and the anisotropic conductive portion is provided on the insulating film (3).
The first dummy electrode (71₁, 71₂) To connect to
2 dummy electrodes (8₁, 8₂) And the second dummy electrode (8₁, 8₂)
A pair of pads (9₁, 9₂) And the first da
Me electrode (71₁, 71₂) To the pad (10₁,Ten₂)
And the second dummy electrode (8 ₁, 8₂) To the pad (9
₁, 9₂) Apply a current for contact resistance measurement to one of the
For measuring the contact resistance between the child (2) and one end (4) of the conductor pattern
Instead, the first dummy electrode (71₁, 71₂) To the
Dead (10₁,Ten₂) And the second dummy electrode (8₁, 8₂)
The pad in communication (9₁, 9₂) Using one of the first
Dummy electrode (71₁, 71₂) And the second dummy electrode (8₁, 8₂) When
LCD panel characterized by measuring contact resistance of
Test method for electrical connection of units. 3. A liquid crystal display panel (1) and the display panel
Conductor pattern where one end (4) connects to the electrode terminal (2) of (1)
The insulating film (3) on which the
In the liquid crystal display device unit connected by
The display panel (1) has a first dummy electrode (72₁, 72₂),
The insulating film (3) is connected to the insulating film (3) through the anisotropic conductive member.
1 dummy electrode (72₁, 72₂) 3 second dams connected to
ー Electrode (8 ₁, 8₂, 8₃) Are provided, and the three second dummy electrodes (8
₁, 8₂, 8₃2 in ()₂, 8₃) Through the contact resistance measurement current.
The electrode terminal (2) and one end (4) of the conductor pattern.
One of the two second dummy electrodes instead of the tactile resistance
(8₂) And one of the second dummy electrodes (8₁)
Using the first dummy electrode (72₁, 72₂) And the second da
Me electrode (8₁, 8₂, 8₃) Is characterized by measuring the contact resistance with
Test method for electrical connection of liquid crystal display panel unit. 4. The liquid crystal display panel (1) includes the display panel.
(1) first dummy electrodes on both aligned ends of the electrode terminals (2) to form aligned (7,7 _1, 7 _2, 71 _1, 71 _2, 72 _1, 72 _2, 73 _1, 73 _2, 74 ₁ , 7
4 ₂ ) is provided, and the second dummy electrode (8, 8 ₁ , 8 ₂ , 8 ₃ ) facing the pair of first dummy electrodes is provided on the insulating film (3). A method for testing electrical connection of a liquid crystal display panel unit according to claim 1, claim 2 or claim 3. 5. The first dummy electrodes (73 ₁ , 73 ₂ , 74 ₁ , 74 ₂ ) formed on the liquid crystal display panel (1) are the same as the electrode terminals (2) formed on the display panel (1). The test method for electrical connection of a liquid crystal display panel unit according to claim 2 or claim 3, wherein the conductor pieces having a width and the same pitch are connected to each other to form a U-shape or a Y-shape. 6. ₁ first dummy electrode (7, 7 formed on the liquid crystal display panel (1), 7 _2, 71 _1, 71 _2, 72 _1, 72 _2, 73 _1, 73 _2, 74 _1, 74 ₂ )
A second dummy electrode formed on the insulating film (3) with the same structure as the electrode terminal (2) formed on the display panel (1).
(8,8 _1, 8 _2, 8 ₃₎ of claim 1 or claim 2 or claim to one end of the conductor pattern formed on the insulating film (3) and (4), characterized in that the same configuration The method for testing the electrical connection of the liquid crystal display panel unit according to item 3.