JP2000235191A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to detect the misalignment of external connecting members of an IC, TCP or FPC, etc., which are disposed on the liquid crystal panel of the liquid crystal display device and are to be connected to connecting terminals with good accuracy in intermediate inspection after packaging when the external connecting members described above are superposed and packaged on the connecting terminals described above. SOLUTION: The surface of the substrate 1 provided with the external connecting terminals 4 and 5 of the liquid crystal display device having the external connecting terminals 4 and 5 disposed on the substrate 1 of the liquid crystal panel is provided with detecting electrodes 6a and 6b for detecting the misalignment of the external connecting members 7 of the IC, etc., to be conducted to the external connecting terminals 4 and 5 near the external connecting terminal 5. The external connecting members having the large misalignment are judged to be unstable in connection in the inspection after the packaging and are then expelled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device, and more particularly to an inspection of a connection with a driving IC.

[0002]

2. Description of the Related Art In recent years, in a liquid crystal display device used for electronic equipment such as a personal computer, a liquid crystal television, and an electronic timepiece, as a method of connecting a liquid crystal driving IC to a liquid crystal panel, a driving circuit is mounted on a glass epoxy substrate and the glass A method of connecting an epoxy substrate and a liquid crystal panel by FPC, a COG (Chop on G) in which a driving IC is directly mounted on the liquid crystal panel.
las) method and TAB (Tape Automa)
ted Bonding) method, TCP (Tape Ca
connection method based on the RRer package has been used. In order to improve the display capacity and reduce the size and thickness of the liquid crystal display device, the COG method and the TCP connection method suitable for surface mounting on a large number of connection electrodes on the liquid crystal panel have been used in many cases. Have been.

FIG. 10 shows that COG is applied to a glass substrate of a liquid crystal panel.
FIG. 11 is a top view of a conventional liquid crystal display device on which a liquid crystal driving IC is mounted by a method, and FIG.
As shown in FIGS. 10 and 11, the lower glass substrate 10
1. A liquid crystal layer 103 is sealed between upper glass substrates 102 to form a liquid crystal panel. On the upper surface of the lower glass substrate 101, an output electrode pattern 104 and an input electrode pattern 105, which are liquid crystal drive electrodes made of an ITO film, are provided. The input electrode pattern 105 can be electrically connected to an external circuit board (not shown) via an FPC or the like. 10
Reference numeral 7 denotes a driving IC having a liquid crystal driving circuit, on one surface of which is provided an output bump 107a and an input bump 10a.
7b are an output terminal 104a and an input electrode pattern 105 provided on a part of the output electrode pattern 104, respectively.
Is provided in correspondence with.

The driving IC 107 is ideally formed by a known COG method, and its output bumps 107a and input bumps 107b correspond to output terminals 104a, respectively.
And joined by an anisotropic conductive adhesive 108 at a position where the input electrode pattern 105 completely overlaps the
The driving IC 107 is mounted on the liquid crystal panel. At this time, the driving IC 107 outputs a driving voltage to the output bump 107 a by a signal input to the input electrode pattern 105 from an external circuit (not shown), and outputs the driving voltage to the output terminal 10.
A drive voltage is applied to each drive electrode from 4a via the output electrode pattern 104, and the liquid crystal is driven to perform display.

[0005]

However, the mounting of the liquid crystal driving IC by the COG method on a conventional liquid crystal panel has the following problems.
This will be described with reference to the drawings. FIG. 12 is an enlarged view of a portion B in FIG.
In contrast, the positions of the input bumps 107b of the driving IC 107 are normal, and FIGS.
This shows an abnormal state in which the position of b is shifted. In the state shown in FIG. 12A, the input bumps 107b overlap without protruding from the corresponding input electrode pattern 105.
In the state shown in (b), the input bumps 107b are located between the adjacent input electrode patterns 105.
In the state shown in (c), the input bumps 107b are located considerably outside the gaps between the input electrode patterns 105. In the mounting by the COG method, when mounting the driving IC 107 on the liquid crystal panel, the positioning of the driving IC is performed by visual observation, so that the positional deviation easily occurs. Therefore, FIG.
The position shown in FIG.
The state shown in (b) and (c) often occurs. Therefore, after mounting, a lighting inspection is performed as an intermediate inspection, and screening for removing defective connections is performed, and only those that pass the inspection are subjected to a process such as FPC connection as the next process.

Here, in the lighting inspection, FIG.
In the case shown in (b), a short circuit occurs between the input electrode patterns 105 and no signal is transmitted, so that the lighting inspection becomes defective and can be eliminated. However, FIG.
In the case shown in (c), the input electrode pattern 105
And the magnitude of the displacement of the input bump 107b,
There is a case where a short circuit occurs between the input electrode pattern 105 and the input bump 107b and a case where it does not occur. In an actual lighting inspection, a lighting failure may not occur in such a state and the inspection may be passed. In this case, the overlapping area between the input bump 107b and the input electrode pattern 105 is small, so the connection is unstable, and after passing the inspection, a portion where conduction between the input bump 107b and the input electrode pattern 105 becomes defective occurs. Lighting failure may occur. Also, after passing the inspection, the anisotropic conductive adhesive 108 attached to the input bump 107b is deformed due to a change in the environment, and the input bump 107b is short-circuited to the adjacent input electrode pattern 105 as well. May be.

[0007] If such lighting failures occur at the time of the final product inspection, which is the final step, the product failure rate increases, and if they occur after the products are shipped, they will be returned to the customer, resulting in economic loss and loss of customer trust. Will be invited. A similar problem to this is that, as described in, for example, Japanese Patent Application Laid-Open No. 4-242721, a TCB in which a liquid crystal driving IC is mounted on a substrate of a liquid crystal panel of a liquid crystal display device by a TAB method.
This also occurs when P is mounted. Also, when connecting a liquid crystal driving IC on an external circuit board provided outside the liquid crystal panel to the liquid crystal panel via the FPC,
A similar problem arises between the connection terminal of (1) and the input electrode pattern of the liquid crystal panel.

According to the present invention, as described above, an external connection member such as a driving IC, TCP, or FPC to be connected to a connection terminal provided on a liquid crystal panel of a liquid crystal display device is overlapped and connected. In the case of mounting, even if an intermediate inspection is performed after the mounting, a short circuit between connection terminals may occur later due to a poor alignment, from among those that have passed the inspection as having been connected, or An object of the present invention is to solve the problem of defective conduction or poor lighting which results in defective lighting. The present invention solves such a problem, and enables an intermediate inspection with higher reliability than before by enabling accurate detection of a displacement of an external connection member in an intermediate inspection immediately after mounting on a liquid crystal panel. An object of the present invention is to provide a liquid crystal display device and to reduce a defective rate and a returned rate of a product.

[0009]

According to a first aspect of the present invention, there is provided a liquid crystal display device having an external connection terminal provided on a substrate of a liquid crystal panel. On the surface on which the external connection terminal is provided, a detection electrode for detecting a displacement of an external connection member to be electrically connected to the external connection terminal is provided near the external connection terminal.

According to a second aspect of the present invention, there is provided the first means, wherein the detecting electrode is located between two adjacent connection terminals of the external connection terminals. It is characterized by having a portion to be formed.

According to a third aspect of the present invention, there is provided the first means, wherein the detection electrode comprises two adjacent connection terminals on the input side or the output side of the external connection terminal. Characterized by having a portion located between the connection terminals.

According to a fourth aspect of the present invention, as a fourth means for solving the above-mentioned problems, in the first means, the detection electrode is provided by connecting two adjacent connection terminals on the output side among the external connection terminals. It is characterized by having a portion located between.

According to a fifth aspect of the present invention, in order to solve the above-mentioned problem, in the first aspect, the detection electrode has a portion located at an outermost portion of the external connection terminal. I do.

According to a sixth aspect of the present invention, in order to solve the above-mentioned problem, the present invention is characterized in that, in the first aspect, the detection electrode has portions located on outermost side portions of the external connection terminal. And

According to a seventh aspect of the present invention, in order to solve the above-mentioned problem, in the second aspect, the detection electrode is provided in at least one of the two adjacent connection terminals.
It is characterized by having a portion folded back along the end of each of the connection terminals.

According to an eighth aspect of the present invention to solve the above-mentioned problems, in the second aspect, the detection electrode is at least one of the two adjacent connection terminals.
It has a U-shaped portion so as to surround the tip of each connection terminal.

According to a ninth aspect of the present invention, there is provided a liquid crystal panel having an external connection terminal provided on a substrate, wherein the external connection terminal is provided on a surface of the substrate on which the external connection terminal is provided. In a method for inspecting a position shift of an external connection member of a liquid crystal display device provided with a detection electrode for detecting a position shift of an external connection member to be electrically connected to the external connection terminal near the external connection terminal, a test pin The test pin is brought into contact with the detection electrode by using an inspection jig having the following structure, and the positional displacement of the external connection member is determined based on the presence or absence of conduction between the external connection member and the detection electrode.

According to a tenth aspect of the present invention, there is provided a liquid crystal driving IC having an IC bump on a substrate of a liquid crystal panel, and the liquid crystal driving IC is mounted on a surface of the substrate on which the driving IC is mounted. In a method for inspecting a displacement of a driving IC of a liquid crystal display device, a detection electrode for detecting a displacement of the driving IC is provided near an electrode terminal provided to be connected to an IC bump, A test pin is provided on the driving IC, the test pin is brought into contact with the detection electrode, and a detection signal regarding the presence / absence of conduction between the IC bump and the detection electrode is output from the driving IC. It is characterized by determining.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. This embodiment relates to a liquid crystal display device in which a liquid crystal driving IC is mounted on a substrate of a liquid crystal panel by a COG method. FIG. 1 is a top view of the present embodiment, and FIG. 2 is a sectional view taken along the line AA of FIG. FIG.
As shown in FIG. 2, a liquid crystal layer 3 is sealed between a lower glass substrate 1 and an upper glass substrate 2 to form a liquid crystal panel. On the upper surface of the lower glass substrate 1, an output electrode pattern 4 and an input electrode pattern 5 made of an ITO film are provided. The output electrode pattern 4 is electrically connected to each drive electrode in the liquid crystal layer 3 of the liquid crystal panel.
It is electrically connected to an external circuit (not shown) via a PC or the like.

The input electrode pattern 5 comprises an electrode pattern 5a arranged substantially in parallel at an interval P1 at equal intervals, and bent electrode patterns 5b1 and 5b2 provided on both sides thereof with a slight interval. Electrode pattern 5b1,
The tip of 5b2 extends toward the electrode pattern 5a, and its direction is substantially perpendicular to the longitudinal direction of the electrode pattern 5a. Reference numerals 6a and 6b denote detection electrodes, each of which has a substantially U-shaped portion surrounding the tip of the electrode patterns 5b1 and 5b2 and detection terminal portions 6a1 and 6b1.

A liquid crystal driving IC 7 is provided on the upper surface of the lower glass substrate 1.
Is implemented. Bumps 7a and 7b are formed on the lower surface of the liquid crystal driving IC 7. 7a is a bump connected to the output electrode pattern 4, and 7b is a bump connected to the input electrode pattern 5. The bumps 7a and 7b are visually aligned so as to overlap the output terminals 4a and the input electrode patterns 5 of the corresponding output electrode patterns 4, or are initially set visually and then aligned by image recognition. The liquid crystal panel is joined by an anisotropic conductive adhesive 8 which is
C7 is implemented. Here, the anisotropic conductive adhesive 8 is made of, for example, ACF (ANISOTROPIC) containing conductive particles.
CONDUCTIVE FILM) tape. In this case, an ACF tape is pasted on the liquid crystal cell in advance, and the IC is temporarily placed (temporarily attached) on the ACF tape of the liquid crystal cell when the liquid crystal driving IC 7 is positioned. The liquid crystal driving IC 7 and the liquid crystal cell are joined by the final press-fitting to the liquid crystal cell while the bumps and the electrode patterns are electrically conducted through the conductive particles, and the mounting is performed. As a mounting method, although not shown, mounting by a paste process may be performed. In this case, prior to the mounting of the liquid crystal driving IC 7, a conductive paste is placed on the bumps 7a and 7b by a known method, and the liquid crystal driving IC 7 is temporarily attached to the liquid crystal cell in the above-described alignment state. The conductive paste is fired and hardened together with the liquid layer cells, and the liquid crystal driving IC is mounted.

After the liquid crystal driving IC 7 is mounted on the liquid crystal panel, the mounting is performed correctly, and an intermediate inspection is performed to determine whether there is a short circuit or a connection failure. At this time, the detection electrodes 6a and 6b are used. In addition, the position of the liquid crystal driving IC is also inspected. Prior to the description of the intermediate inspection, the detection electrode 6
a and 6b will be described. FIG. 3 is an enlarged view (top view) of a portion C in FIG. However, in the drawing, for convenience, members below the liquid crystal driving diagram IC are indicated by solid lines. The arrangement of the detection electrodes 6a and the dimensional relationship with the input electrode pattern 5 will be described with reference to FIG. The U-shaped portion of the detection electrode 6a extends along the portion 6a2 located between the tip of the electrode pattern 5b1 and the electrode pattern 5a, the portion 6a3 folded along the inside of the electrode pattern 5b1, and the outside of the electrode pattern 5b1. It consists of a part 6a4.

The distance between the portion 6a2 of the detection electrode 6a and the electrode pattern 5a is equal to the distance P between the electrode patterns 5a.
It is almost equal to 1. An interval P2 between the portion 6a2 and the electrode pattern 5b1 is smaller than the interval P1. The distance P3 between the portion 6a3 and the portion 6a4 and the electrode pattern 5b1 is equal to the distance P2
It is a value close to. The detection electrode 6b on the side opposite to the detection electrode 6a is not shown in an enlarged view but is shown in FIG.
Are symmetrical to those shown in FIG. 5, and have the same dimensional relationship as above in the electrode patterns 5a and 5b2. Here, FIG. 3A shows a case where the bump 7b is located at a normal position, and FIG. 3B shows a case where the liquid crystal driving IC 7 is located at a position slightly shifted rightward from the normal position. FIG. 3 (c) shows a case where they are further shifted to the right.

In the intermediate inspection, the input electrode pattern 5
The lighting inspection is performed by adding a lighting signal from an external inspection circuit to the LCD. In addition, the liquid crystal driving IC 7 shown in FIG.
As a test for positional displacement with respect to the lower glass substrate 1, conduction between the detection electrode 6a and the electrode pattern 5b1, conduction between the detection electrode 6b and the electrode pattern 5b2, and electrodes other than the electrode pattern 5a to which the bump 7b is to be connected are provided. The presence or absence of a bad connection with the pattern is detected. When the bump 7b is at a normal position as shown in FIG. 3A, conduction does not occur in any of the detection electrodes 6a and 6b. In this case, if there is no abnormality in the lighting inspection, the intermediate inspection passes. This is because, if the position of the bump is normal, conduction with the electrode pattern is stable, and a change in the conduction state later rarely causes a short-circuit or disconnection to cause lighting failure.

As shown in FIG. 3B, there is a case where the bump 7b is slightly displaced to the right and the conduction between the detection electrode 6a and the electrode pattern 5b1 and the conduction between the other electrode patterns are not performed. If the conduction of the detection electrode 6a is detected, even if there is no abnormality in the lighting inspection, it is determined that the positioning is poor and the test is rejected. This is because, in this case, the area where the bump 7b and the electrode pattern 5a overlap is small due to the displacement of the liquid crystal driving IC, and the bump 7b protrudes into the gap between the electrode pattern 5a and the electrode pattern 5a. This is because the conduction with 5a is unstable, and the probability of lighting failure later is high. Although not shown,
Conversely, the bumps 7b may be slightly shifted to the left, and conduction between the detection electrodes 6b and the electrode patterns 5b2 in FIG. 1 may occur. At this time, if conduction is detected, it is rejected even if there is no abnormality in the lighting inspection for the same reason. Next, bump 7
Is further shifted to the right side and straddles between the electrode patterns 5a as shown in FIG. 3 (c), a lighting abnormality occurs, and the test fails even without detection by the detection electrode 6a.

It should be noted that the liquid crystal driving IC is placed at a position where it is shifted from the normal position by a predetermined amount in the vertical direction in FIG. 3 or inclined by a predetermined amount in the oblique direction. And the output-side bump 7a shown in FIG.
, And this displacement may cause a short circuit or poor conduction later. However, in the present embodiment, the above-described vertical displacement or inclination is equal to or more than a predetermined amount due to the presence of the portions 6a3 and 6a4 of the detection electrode 6a shown in FIG. 3 and the corresponding portions of the detection electrode 6b shown in FIG. , The input and output bumps 7b, 7a
However, the electrode patterns 5b1 or 5b2 and the detection electrodes are electrically connected when the bumps 7b and 7a are shifted downward in the diagram of FIG. Therefore, even in such a case, the intermediate inspection is rejected, and the bumps 7a on the output side with poor alignment are surely excluded.

Whether the detection electrodes 6a and 6b are conductive or not is determined by applying a test pin for detecting a displacement provided on an inspection jig or the like to the detection terminal portions 6a1 and 6b1 shown in FIG. FIG. 4 is a plan view showing the intermediate inspection jig. The intermediate inspection jig 30 includes a jig substrate 32 and a probe 3 for lighting inspection.
The test pins 1a, 31b1, 31b2 and the test pins 33a, 33b for detecting the displacement are provided to protrude. The probes 31a, 31b1, 31b2 are pressed against the electrode patterns 5a, 5b1, 5b2 shown in FIG. 1, respectively, and the test pins 33a, 33b are pressed against the detection terminal portions 6a1, 6b1, respectively. These probes and test pins are connected to an inspection circuit (not shown) via an FPC, and a lighting inspection and a positional deviation inspection are performed by a switching method or the like. That is, the presence or absence of continuity between the test pin and the probe is detected by the inspection circuit, and the result can be reported by a buzzer or a display.

By providing a test pin for detecting the displacement on the liquid crystal driving IC, the same applies as long as the test pin is finally electrically connected to the test circuit via the input bump of the IC. Position can be inspected.

According to the present embodiment, the liquid crystal panel having defective lighting and defective IC alignment is eliminated by the above-described intermediate inspection, and only those that pass the test are bonded to a polarizing plate.
A post-process such as FPC connection is performed, and the product is inspected before shipment. According to the present embodiment, regarding the mounting of the liquid crystal driving IC,
For the reasons already explained, an intermediate inspection with higher reliability than before is performed, so that subsequent lighting failures are reduced,
The defective rate of the finished product and the defective rate after shipment can be significantly reduced as compared with the conventional case.

Hereinafter, a modification of the embodiment shown in FIG. 1 will be described with reference to the drawings. FIG. 5 is a top view showing this example. Only the parts related to the deformation are shown. As shown in FIG. 5, an input electrode pattern 5 and detection electrodes 16a and 16b disposed on both sides of the input electrode pattern 5 are provided on the upper surface of the lower glass substrate 1. The input electrode pattern 5 is composed of electrode patterns 5a arranged at equal intervals and electrode patterns 5c1 and 5c2 arranged at equal intervals on both sides thereof and having bent and outwardly extending ends. The detection electrode 16a is arranged outside the electrode pattern 5c1. Detection electrode 1
6a has a U-shaped portion surrounding the end of the electrode pattern 5c1 and a detection terminal portion 16a1. A detection electrode 16b having the same shape as the detection electrode 16a is arranged outside the electrode pattern 5c2. The detection electrode 16b has a U-shaped portion surrounding the end of the electrode pattern 5c2 and a detection terminal portion 16b1. Also in the case of this example, the positional deviation of the bump 7b on the input side of the liquid crystal driving IC in the right, left, up and down directions is accurately detected by the detection electrodes 16a and 16b according to the same principle as the embodiment shown in FIG. This makes it possible to inspect the displacement of the liquid crystal driving IC.

Further, another modified example of the embodiment shown in FIG. 1 will be described with reference to the drawings. FIG. 6 is a top view showing this modification. Only the parts related to the deformation are shown. On the upper surface of the lower glass substrate 1, an input electrode pattern 5 and an output terminal 4a of an output electrode pattern are provided. Extraction electrodes 27a and 27b are provided integrally with output terminals 4a1 and 4a2 at both ends, respectively, and these have extraction terminal portions 27a1 and 27b1, respectively. A detection electrode 26a having a U-shaped portion is provided in the vicinity of the output terminal 4a1 and surrounding the end thereof, and the detection electrode 26a has a detection terminal 26a1 at the end.
A detection electrode 26b having a U-shaped portion surrounding the end is provided in the vicinity of the output terminal 4a2, and the detection electrode 26b has a detection terminal 26b1 at the end.

On the liquid crystal side surface of the lower glass substrate 1, a liquid crystal driving IC 7 is positioned so that its input bumps 7b overlap the input electrode pattern 5 and its output bumps 7a overlap the output terminals 4a. It is electrically connected by the anisotropic conductive adhesive 8 and mounted. At this time, the liquid crystal driving IC
When the left, right, up, and diagonal positional shifts on the diagram of FIG. 7 become a predetermined value or more, the output terminal 4a1 and the detection electrode 2
6a, or between the output terminal 4a2 and the detection electrode 26.
b. These continuities connect the test pins to the detection terminal portions 26a1, 26b1, and the lead terminal portion 2
7a1 and 27b1 can be detected by testing the continuity between the detection terminal section and the corresponding lead terminal section. Therefore, the displacement of the liquid crystal driving IC 7 can be accurately inspected. Although not shown in the drawings, a structure is provided in which one detecting means close to the output terminal 4a and one detecting means close to the input electrode pattern 5 as shown in FIG. Also, the displacement of the liquid crystal driving IC can be accurately detected.

An embodiment of the present invention will be described below with reference to another drawing. In this embodiment, a TCP (Tape Carrier Packa) in which a liquid crystal driving IC is mounted on a liquid crystal panel substrate by a TAB method.
g)). FIG. 7 is a top view of the liquid crystal display device of the present embodiment, and FIG. 8 is a sectional view taken along line BB of FIG. As shown in FIGS. 7 and 8, a liquid crystal layer 3 is sealed between a lower glass substrate 1 and an upper glass substrate 2 to form a liquid crystal panel. PCB 21 is attached to the lower surface of the lower glass substrate. On the upper surface of the lower glass substrate 1, an output electrode pattern 4 as an output terminal made of an ITO film and detection electrodes 36a and 36b described in detail later are provided. The output electrode pattern 4 is electrically connected to each drive electrode of the liquid crystal panel.

Reference numeral 11 denotes a TCP, and a base film 12
Lead wire 14 for output and lead wire 15 for input
The bumps 7a and 7b on the output side and the input side of the liquid crystal driving IC 7 are connected to one ends 14a and 15a of the output lead wire 14 and the input lead wire 15 by the TAB method. Has been implemented. Reference numeral 18 denotes a protective film provided on the TCP 11 and covering the lead wires 14 and 15, which is formed after the mounting of the liquid crystal driving IC 7. The other end portions 14b and 15b of the lead wires 14 and 15 are provided.
Is not covered with the protective film 18. In this state, the end 14b of the output lead wire 14 of the TCP 11
Are connected to the output electrode pattern 4 on the lower glass substrate 1 via the anisotropic conductive film 19, and are mounted on the lower glass substrate 1. Next, the end 15b of the input lead 15 of the TCP 11 and the wiring electrode 22 of the PCB 21 are connected by soldering.

Here, the shape and role of the detection electrodes 36a and 36b will be described.
FIGS. 6A and 6B are diagrams showing the operation of the detection electrodes 3a and 3b. FIG.
6B, and FIG. 6B relates to the detection electrode 36b. As shown in the figure, the output electrode patterns 4 are elongated and are arranged in parallel at intervals of P4. FIG.
The detection electrode 36a shown in (a) has a portion 36a1 parallel to the output electrode pattern 4, a portion 36a2 that is bent substantially perpendicularly and extends outward, and a detection terminal portion 36a3 connected to the extension portion 36a2. . The parallel portion 36a1 is
It has a long shape, and is arranged at an interval of P5 on the left side of the adjacent output electrode pattern 4. P5 is a value sufficiently smaller than P4.

The detection electrode 36b shown in FIG. 9B has a symmetrical shape and size with respect to the detection electrode 36a.
1, 36a2, and portions 36b1, 36b2 and a detection terminal portion 36b3 respectively corresponding to the detection terminal portion 36a3. As shown in FIG.
When the position of the end 14b is slightly shifted leftward with respect to the corresponding output electrode pattern 4 and overlaps the detection electrode 36a,
No conduction occurs between the output electrode patterns 4, but conduction occurs between the detection electrode 36a and the output electrode pattern 4 adjacent thereto. Conversely, when the position of the input end 14b of the output lead wire 14 is slightly shifted rightward with respect to the corresponding output electrode pattern 4 and overlaps the detection electrode 36b as shown in FIG. No conduction occurs between the patterns 4, but conduction occurs between the detection electrode 36b and the output electrode pattern 4 adjacent thereto.

Utilizing these properties, as shown in FIG. 7, at the stage of the intermediate inspection after the TCP 11 is mounted on the lower glass substrate 1 of the liquid crystal panel, the detection electrodes 36a and 36b and the adjacent output electrode patterns 4 The presence or absence of continuity is detected, and any of the continuities is judged as having a large displacement of the TCP 11 even if there is no abnormality in the lighting test, and is rejected as a failure. The detection of the continuity can be performed by using a test jig and applying test pins to the detection terminal portions 36a3 and 36b3 of the detection electrodes and the output electrode pattern 4 adjacent thereto. In this manner, for the same reason as described above, it is possible to improve the reliability of the mounting as compared with the related art.

As a modification of this embodiment, although not shown, an external drive circuit is connected to a lower glass substrate of a liquid crystal panel provided with the same output electrode patterns and detection electrodes as shown in FIG. There is a liquid crystal display device having an FPC mounted thereon. In the case of this embodiment, as in the case of the embodiment shown in FIG. 7, the reliability of mounting can be improved as compared with the related art.

[0039]

As described above, according to the present invention, an external connection member such as a driving IC, TCP, or FPC to be connected to a connection terminal provided on a liquid crystal panel of a liquid crystal display device. It is possible to accurately detect the displacement of the external connection member in an intermediate inspection after mounting when the components are superimposed and mounted. This allows
It is possible to provide a liquid crystal display device capable of performing an intermediate inspection with higher reliability than before, and to reduce a product defect rate and a product return rate.

[Brief description of the drawings]

FIG. 1 shows a COG of an IC according to an embodiment of the present invention.
FIG. 3 is a top view illustrating a configuration of a liquid crystal display device according to mounting.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a portion C in FIG. 1;

FIG. 4 is a plan view showing a structure of an inspection jig for inspecting mounting of an IC in the liquid crystal display device shown in FIG.

FIG. 5 is a COG of an IC according to one embodiment of the present invention;
FIG. 4 is a diagram showing an electrode structure for detecting a mounting displacement in a liquid crystal display device according to the mounting.

FIG. 6 is a diagram showing an electrode structure for detecting a mounting displacement in a liquid crystal display device according to an embodiment of the present invention.

FIG. 7 is a top view showing a configuration of a liquid crystal display device according to the TCP method, which is one of the embodiments of the present invention.

FIG. 8 is a sectional view taken along the line BB of FIG. 7;

FIG. 9 is a diagram illustrating the operation of a mounting displacement detection unit in the liquid crystal display device illustrated in FIG. 7;

FIG. 10 is a top view showing the configuration of a conventional liquid crystal display device according to COG mounting of an IC.

FIG. 11 is a sectional view taken along line AA of FIG. 10;

FIG. 12 is an enlarged view of a portion B in FIG. 10;

[Explanation of symbols]

 Reference Signs List 1 lower glass substrate 2 upper glass substrate 3 liquid crystal layer 4 output electrode pattern 5 input electrode pattern 6, 16, 26, 36 detection electrode 7 liquid crystal drive IC 7a, 7b bump 8 anisotropic conductive adhesive 30 intermediate inspection jig 33 Test Pin

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H092 GA48 GA54 GA57 GA60 HA25 JB77 MA32 MA35 MA37 MA56 NA25 NA27 NA29 NA30 PA06 5C094 AA42 AA43 AA48 BA43 DA09 DA12 DB02 DB05 EA03 EA10 FA01 GB01

Claims (10)

[Claims] 1. A liquid crystal display device having an external connection terminal provided on a substrate of a liquid crystal panel, wherein the external connection terminal is provided near the external connection terminal on a surface of the substrate on which the external connection terminal is provided. A liquid crystal display device provided with a detection electrode for detecting a displacement of an external connection member to be conducted. 2. The liquid crystal display device according to claim 1, wherein the detection electrode has a portion located between two adjacent connection terminals of the external connection terminals. 3. The liquid crystal according to claim 1, wherein the detection electrode has a portion located between two adjacent connection terminals on the input side and the output side of the external connection terminals. Display device. 4. The liquid crystal display device according to claim 1, wherein the detection electrode has a portion located between two adjacent connection terminals on the output side among the external connection terminals. 5. The device according to claim 1, wherein the detection electrode has a portion located at an outermost portion of the external connection terminal.
3. The liquid crystal display device according to 1. 6. The liquid crystal display device according to claim 1, wherein the detection electrode has portions located on outermost side portions of the external connection terminal. 7. The liquid crystal display device according to claim 2, wherein the detection electrode has a portion folded along an end of at least one of the two adjacent connection terminals. . 8. The device according to claim 2, wherein the detection electrode has a U-shaped portion so as to surround a tip of at least one of the two adjacent connection terminals. Liquid crystal display. 9. An external connection terminal provided on a substrate of a liquid crystal panel, wherein the surface of the substrate on which the external connection terminal is provided is to be electrically connected to the external connection terminal near the external connection terminal. In a method for inspecting a position shift of an external connection member of a liquid crystal display device provided with a detection electrode for detecting a position shift of an external connection member, a test jig having a test pin is used, and the test pin is connected to the detection electrode. A method for inspecting a position shift of an external connection member of a liquid crystal display device, wherein the position of the external connection member is determined based on whether the external connection member is electrically connected to a detection electrode. 10. A liquid crystal driving IC having IC bumps is mounted on a substrate of a liquid crystal panel, and the liquid crystal driving IC is mounted on the substrate.
A detection electrode for detecting a displacement of the driving IC near the electrode terminal provided to be connected to the IC bump on the mounting surface of the driving IC, the displacement of the driving IC of the liquid crystal display device; In the inspection method of (1), a test pin is provided on the drive IC, the test pin is brought into contact with the detection electrode, and a detection signal regarding the presence or absence of conduction between the IC bump and the detection electrode is output from the drive IC. I
A method for inspecting a position shift of a driving IC of a liquid crystal display device, wherein the position shift of C is determined.