JP2002329941A - Connection structure of wiring board and connection structure of liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the positional deviation of one wiring board from another wiring board in their spinning direction within a specified range and facilitate alignment positioning work. SOLUTION: A pair of right and left regularly circular reference markers M1 are formed on one wiring board 1, and a pair of right and left alignment markers M2 corresponding to the circular reference markers M1 are formed on another wiring board FC. The markers M2 have elongated hole-like or elliptic shapes having a pair of parallel long sides or tetragonal shapes each having one diagonal line longer than the other. The elongated hole-like or elliptic shapes having the pair of parallel long sides or tetragonal shapes each having one diagonal line longer than the other are formed such that each narrow side widths in the longitudinal direction is approximately the same as the diameter S of the regularly circular reference marker M1, and each board side length in the transverse direction is longer than the diameter S of the reference marker M1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring board for accurately aligning both substrates with a marker in connection between a general wiring board and a wiring board or between one of the substrates of a liquid crystal display panel and the wiring board. And the connection structure of the liquid crystal display panel.

[0002]

2. Description of the Related Art A conventional connection between a general wiring substrate and a wiring substrate will be described with reference to an example of connection of a liquid crystal display panel in a liquid crystal display device. In recent years, due to advances in microfabrication technology, material technology, and high-density packaging technology, in various applications such as AV, OA, in-vehicle, and information communication, the ratio of liquid crystal display devices is rapidly increasing as a key device replacing CRT (Cathode Ray Tube). It is expanding to. In manufacturing a liquid crystal display device, a semiconductor element and a circuit board (flexible wiring board or printed wiring board) for driving the liquid crystal panel are mounted in a modularization step following a so-called cell step. There are various types of mounting methods, for example, TCP (tape carrier package) mounting a semiconductor element (IC chip or LSI chip) on a tape-like film substrate on which a wiring pattern is formed, or mounting on a glass substrate. COG (chip o) connected directly to the semiconductor element to the electrode terminal of
n glass) implementation. Note that a plastic flexible substrate may be used instead of a glass substrate, and this is referred to as COF (chip onflexible) or COP (chip
on plastic).

In the COG method in a liquid crystal display device, since a driving semiconductor element is mounted on a liquid crystal display panel, signals for driving the liquid crystal display device can be reduced. This means that the number of connections between the liquid crystal display panel and the printed wiring board can be reduced. However, as the definition of the liquid crystal display device increases, the number of signals for driving the liquid crystal display device also increases, and the number of connections between the liquid crystal display panel and the printed wiring board tends to increase.

A general liquid crystal display device using the COG mounting method will be described with reference to the drawings. FIG. 9 is a general view of a liquid crystal display device using the COG mounting method. On the outer periphery of the liquid crystal display panel 1, a printed wiring board P on which a driving semiconductor element IC for displaying the liquid crystal display panel 1 is mounted.
C, the liquid crystal display panel 1 and the printed wiring board PC
A flexible wiring board FC for electrically connecting the driving semiconductor element of the display panel and the driving semiconductor element of the printed wiring board PC is disposed therebetween. The liquid crystal display panel 1 and the flexible wiring board FC, or the flexible wiring board FC
The connection between the substrate and the printed wiring board PC uses an anisotropic conductive adhesive (hereinafter referred to as ACF) or the like. The order of connection is such that the flexible wiring board FC and the liquid crystal display panel 1 are connected first, and then the flexible wiring board FC and the printed wiring board PC are connected.

At present, liquid crystal display devices have become compact,
Further, as the definition becomes higher, the number of signal lines for driving the liquid crystal display device increases. When the number of signal lines for driving the liquid crystal display device increases, the number of signal lines connecting the printed wiring board PC and the liquid crystal display panel 1 increases. That is, terminal electrodes (hereinafter, referred to as flexible wiring boards) that electrically connect the flexible wiring board FC and the glass substrate A without increasing the absolute number of the flexible wiring boards FC or changing the outer shape of the flexible wiring boards FC. The terminal electrode of the FC is a terminal electrode 3 and the terminal electrode of the liquid crystal panel 1 is a terminal electrode 4).
The shape of the terminal electrode joining the C and the printed wiring board PC (hereinafter, the terminal electrode of the printed wiring board PC is referred to as the terminal electrode 5) is reduced, and as a result, the terminal electrodes 3, 4, and 5 are formed. , That is, the number of signals increases. At present, it is often difficult to increase the absolute number of flexible wiring boards FC in order to make the shape of the liquid crystal display device compact. Accordingly, there is a tendency that the shapes of the terminal electrodes 3, 4, and 5 are reduced without changing the outer shape of the flexible wiring board FC.

When connecting the flexible wiring substrate FC to the liquid crystal display panel 1 as described above, if the shapes of the terminal electrodes 3 and the terminal electrodes 4 are reduced due to the high definition of the liquid crystal display device, the flexible wiring substrate FC and the liquid crystal display panel are connected. 1 for A
When joining with CF, it is necessary to join after confirming that the connection positions of the terminal electrodes 3 and 4 are matched. If the connection positions do not match, problems such as a signal not being transmitted or a short circuit with an adjacent terminal electrode occur, and normal display is not performed. Further, if a deviation occurs in the connection between the terminal electrode 3 and the terminal electrode 4, there arises a problem that the connection position between the terminal electrode 3 and the terminal electrode 5 does not match when the flexible wiring board FC and the printed wiring board PC are connected.

[0007] For this reason, the method of checking whether the connection positions of the terminal electrodes 3 of the flexible wiring board FC and the terminal electrodes 4 of the liquid crystal display panel 1 match and the method of connection are shown in FIG.
As shown in FIG. 0, a circular alignment marker N2 of the flexible wiring substrate FC and a circular reference marker N1 are formed on one of the substrates 1A of the liquid crystal display panel 1 in the related art.

The connection between the flexible wiring board FC and the liquid crystal display panel 1 is made by connecting the terminal electrodes 3 of the flexible wiring board FC.
And the terminal electrode 4 of the liquid crystal display panel 1 is connected via an ACF. The conventional alignment marker N2 is provided in a circular shape larger than the reference marker N1 on the liquid crystal display panel 1. I have. In FIG. 10, the configuration of the flexible wiring board FC includes a non-conductive film (hereinafter, referred to as a cover film) 6, a metal foil such as a copper foil of the terminal electrode 3 of the flexible wiring board FC, and a non-conductive film ( Hereinafter, it is referred to as a base film) 7. In addition, the structure of the flexible printed circuit board FC is such that when the arrangement of outputs to the liquid crystal display panel 1 and the number of outputs are different with respect to the signal input from the printed circuit board PC, the flexible printed circuit board FC has a multilayer structure. Such an output is made in the FC. In other words, the flexible wiring board FC has a multilayer structure in which a conductive layer is formed on a transparent resin, and the markers N1 and N2 can be aligned via the transparent resin.

In FIG. 10, on the liquid crystal panel side, generally, a terminal electrode 4 for inputting a signal to the driving semiconductor element IC is arranged on the liquid crystal display panel 1, and flexible wiring is performed by using an ACF. The substrate FC and the liquid crystal display panel 1 are connected. Further, in the case of manual operation (visual alignment), the reference marker N1 has a smaller diameter than the alignment marker N2 so that alignment can be easily performed.

Therefore, when performing manual alignment (visual alignment), the flexible wiring board FC is placed on the liquid crystal display panel 1 and, when viewed from above, is positioned within the circle of the conventional alignment marker N2. When the reference marker N1 is inserted, it is assumed that the terminal electrodes 3 and 4 are at a normal joining position. On the other hand, when the alignment between the terminal electrode 3 and the terminal electrode 4 is automatically (mechanically) adjusted, the alignment machine N2 and the reference marker N1 are read and aligned by the equipment machine, but are read by the equipment machine. Is the center coordinate of a perfect circle, and when the alignment marker N2 and the reference marker N1 are read and joined at the same position, the position arrangement is as shown in FIG.

As described above, whether alignment is performed manually or automatically, the determination as to whether the alignment is correct is made based on whether the reference marker N1 is included in the alignment marker N2. FIG. 12 shows that although the flexible wiring board is inclined, the reference marker N1 can be confirmed in the alignment marker N2.
Position alignment is performed on the assumption that the alignment is correct.

The diameters of the alignment marker N2 of the flexible wiring board FC and the reference marker N1 of the liquid crystal display panel 1 are adjacent to each other due to the width and length of the terminal electrodes 3 and 4, the total number of terminal electrodes to be joined, and the like. It is designed so as not to cause a problem such as a short-circuit with the terminal electrode that is not provided. This example will be described with reference to FIG. In FIG. 13, when the short side of the terminal electrode 3 or the terminal electrode 4 is the X direction (left-right direction) and the long side is the Y direction (front-back direction), the width of the terminal electrode 3 and the terminal electrode 4 is 100 μm. At some point, if the difference between the diameter of the alignment marker N2 and the diameter of the reference marker N1 is 100 μm, 50 μm in the X direction and Y
There is an allowable value of 50 μm in the direction, and the connection width in the X direction between the terminal electrode 3 and the terminal electrode 4 also has a minimum joint width of 50 μm. However, a shift in the θ direction between the X direction on the short side and the Y direction on the long side (hereinafter, “shift in the rotation direction”)
Also say. Is a problem when connecting the flexible wiring board FC and the printed wiring board PC.

[0013]

The method of performing positioning using the markers N1 and N2 having the perfect circular shape as described above is as follows.
Although it has an advantage that the alignment can be performed by a simple method, it has the following problems. That is, FIG. 14 is a diagram illustrating a state where the flexible wiring board FC is displaced in the θ direction when the terminal electrodes 3 and 4 are connected. When connecting the terminal electrodes 3 and 4, and connecting the terminal electrodes 3 and 5, the terminal electrodes 3 and 4 are connected first, and then the terminal electrodes 3 and 5 are connected. In FIG. 14, 9
The dotted line indicates the terminal electrode 3 when the alignment is perfectly matched.
It is an overhead line. As can be seen from FIG. 14, a small shift in the θ direction when the terminal electrode 3 and the terminal electrode 4 are connected also greatly shifts in the θ direction when the terminal electrode 3 and the terminal electrode 5 are connected. That is, when the terminal electrode 3 and the terminal electrode 4 are displaced in the θ direction at the time of connection, even if the terminal electrode 3 and the terminal electrode 4 are normally joined as shown in FIG. When connecting the substrate PC, there arises a problem that the positions of the terminal electrodes 3 and the terminal electrodes 5 do not match at all. That is, it is not possible to cope with such a positional deviation due to the rotation direction between the markers having the perfect circle shape. When such a displacement in the rotational direction occurs, when the terminal electrode 3 and the terminal electrode 5 are joined,
There is a serious problem that a short circuit occurs between adjacent terminal electrodes. Further, even if it is confirmed that the alignment is deviated when the terminal electrode 3 and the terminal electrode 5 are connected, a large deviation cannot be corrected because the terminal electrode 3 and the terminal electrode 4 are already connected.

In order to prevent these problems, it is necessary to set θ when joining the flexible wiring board FC and the liquid crystal display panel 1.
The deviation in the direction must be suppressed as much as possible. To do this, it is conceivable to reduce the difference in diameter between the circular reference marker N1 and the circular alignment marker N2. However, if the diameters of the holes are almost the same, there is a problem that it is difficult to align the circular reference marker N1 with the alignment marker N2, especially when performing manual alignment. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bonding structure of a wiring board and a liquid crystal display which facilitates alignment work while suppressing a rotational displacement between one wiring board and the other wiring board within a predetermined range. An object of the present invention is to provide a panel joint structure.

[0016]

In order to solve the above problems and achieve the above object, a wiring board connection structure according to a first aspect of the present invention has one wiring substrate having terminal electrodes and a terminal electrode. On the basis of a pair of left and right markers provided on each of the other wiring boards, a wiring board connection structure for electrically connecting both terminal electrodes while performing front-rear and left-right alignment is provided. A perfect circular reference marker is provided, and an alignment marker corresponding to the perfect circular reference marker is provided on the other wiring board in a long hole shape or an elliptical shape having a pair of parallel long sides or one diagonal line is the other diagonal line. A pair of left and right is provided as a longer rectangular shape, a long hole shape or an elliptical shape having a pair of parallel long sides or a rectangular shape in which one diagonal line is longer than the other diagonal line,
It is characterized in that it is large enough to include the reference marker, narrow in the front-back direction, and long in the left-right direction.

According to a second aspect of the present invention, there is provided a connection structure for a liquid crystal display panel, comprising: a printed wiring board provided on a periphery of the liquid crystal display panel and provided with a driving semiconductor element for displaying the liquid crystal display panel; A flexible wiring board electrically connected between the driving semiconductor element of the display panel and the driving semiconductor element of the printed wiring board, which is arranged between the wiring board and the printed wiring board. A flexible wiring board having electrodes is connected to a pair of left and right markers provided on each side, and a wiring board connection structure for electrically connecting both terminal electrodes while performing front-rear and left-right alignment is provided. A pair of right and left circular reference markers are provided on the wiring board or the flexible wiring board, and the flexible wiring board corresponding to these is provided. Is an alignment marker corresponding to the circular reference marker on one of the wiring substrates of the liquid crystal display panel, a long hole shape or an elliptical shape having a pair of parallel long sides, or a square shape in which one diagonal line is longer than the other diagonal line. A pair of left and right sides is provided, and a long hole shape or an elliptical shape having this pair of parallel long side portions or a square shape in which one diagonal line is longer than the other diagonal line is a size that can include the reference marker, and the front-back direction is narrow. , Characterized by being formed long in the left-right direction.

According to a third aspect of the present invention, there is provided a connection structure for a liquid crystal display panel, comprising: a printed wiring board provided on a periphery of the liquid crystal display panel and provided with a driving semiconductor element for displaying the liquid crystal display panel; A flexible wiring board electrically connected between the driving semiconductor element of the display panel and the driving semiconductor element of the printed wiring board, which is arranged between the wiring board and the printed wiring board. A flexible wiring board or printed wiring in a wiring board connection structure in which both terminal electrodes are electrically connected while performing front-rear, left-right positioning with reference to a pair of left and right markers provided on each of the flexible wiring boards having electrodes. A pair of right and left circular reference markers are provided on the board, and the printed circuit board or the flexible A pair of left and right alignment markers corresponding to the circle-shaped reference markers are provided on the substrate as a long hole shape or an elliptical shape having a pair of parallel long sides or a square shape in which one diagonal line is longer than the other diagonal line. A long hole shape or an elliptical shape having parallel long sides or a square shape in which one diagonal is longer than the other diagonal is large enough to include the reference marker, and is formed narrow in the front-rear direction and long in the left-right direction. It is characterized by being.

Here, the rectangular shape in which one diagonal is longer than the other diagonal includes a rectangular shape, a parallelogram shape, and a rhombus shape. Also, the elliptical shape includes a long hole shape having a pair of parallel long sides and a shape close to a rectangular shape as much as possible. Further, the alignment marker may be formed as a hole penetrating the wiring board, or may be formed using a metal foil of a conductive layer of the wiring board.

According to these inventions, when manual alignment is performed (visual alignment), the reference marker is inserted into the alignment marker in the same manner as in the conventional alignment of the markers of perfect circular shapes. It is enough to check if it is done. Since the size of the alignment marker in the front-rear direction is strict, displacement in the rotation direction can be suppressed within a predetermined range. In addition, since the left and right dimensions have more room than before, alignment of the alignment marker with respect to the circular reference marker is facilitated.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In this embodiment, FIG.
As shown in FIGS. 1 to 4, COG in a liquid crystal display device
The present invention is applied to implementation. That is, a liquid crystal display panel 1 having a liquid crystal layer sandwiched between a pair of substrates, and a printed wiring board PC provided with a driving semiconductor element IC for displaying the liquid crystal display panel 1 arranged on the outer periphery of the liquid crystal display panel 1 , Liquid crystal display panel 1 and printed wiring board P
C and a flexible wiring board FC for electrically connecting a driving circuit of the liquid crystal display panel 1 and a driving semiconductor element of the printed wiring board PC (see FIG. 10).
The order of connection is to connect the liquid crystal display panel 1 and the flexible wiring board FC first, and then to connect the flexible wiring board F
C and the printed wiring board PC are connected. The connection between the liquid crystal display panel 1 and the flexible wiring board FC, and the connection between the flexible wiring board FC and the printed wiring board PC use an anisotropic conductive adhesive (Anistropic Conductive Film, hereinafter referred to as ACF). The flexible wiring board F
The terminal electrode 3 of C and the terminal electrode 4 of the liquid crystal panel 1 are formed in opposing linear shapes.

In the present embodiment, a circular reference marker M1 is provided on the left and right of the mounting area of one substrate 1A of the liquid crystal display panel 1.
Are provided, and on the other hand, an elongated hole-shaped alignment marker M2 for positioning is provided on the flexible wiring board FC. As shown in FIG. 4, the elongated hole shape of the alignment marker M2 is a long hole shape having a pair of parallel long side portions (the straight line portion of X1 in FIG. 4), and the narrow circle shape in the narrow front-back direction Y1. Is substantially equal to the diameter S of the reference marker M2, and is longer than the diameter S of the circle-shaped reference marker M2 in the long horizontal direction X1.

The alignment marker M2 of the flexible wiring board FC is formed by hollowing out a metal foil such as a copper foil of the conductive portion 3 as in the related art. That is, the terminal electrode 3 of the flexible wiring board FC and the alignment marker M2
Is formed of a conductive metal foil such as a copper foil. The alignment marker M2 of the present embodiment has a shape obtained by cutting the upper and lower parts of the alignment marker N2 in the Y1-axis direction using a conventional regular circular alignment marker N2. belongs to. Therefore, the conventional one is processed and used as it is. The inside of the alignment marker M2 is transparent, but does not transmit light because the terminal electrode 3 of the conductive portion is formed of a metal foil such as a copper foil. The cover film 6 and the base film 7 only sandwich the metal foil 3 such as a copper foil constituting the alignment marker N2, and nothing is applied (see the cross-sectional view on the right side in FIG. 1). The base film (base material) 7 and the cover film (protective film) 6 have a multilayer film structure formed of a resin, and are non-conductive and translucent, so that light is transmitted. Therefore, the reference marker M1 is interposed between the translucent resins 6 and 7.
And the alignment marker M2 can be aligned.

In this embodiment, a conventional perfect circular alignment marker N2 is also provided near the pair of left and right long hole-shaped alignment markers M2 (the lower side in FIGS. 1 to 3). This is to make it possible to cope with a case where the alignment is automatically adjusted, and is left at a position translated in the Y-axis method. Further, in the present embodiment, the reference marker M1 is provided on one substrate 1A of the liquid crystal display panel 1, and the alignment marker M2 is provided on the flexible wiring substrate FC. Alternatively, it is also possible to provide a reference marker M1 and an alignment marker M2 in the same manner in relation to the flexible wiring board FC and the printed wiring board PC, and to electrically connect them.

The alignment of the alignment marker M2 with respect to the reference marker M1 of the liquid crystal display panel 1 is the same as the conventional method, and it suffices to confirm the reference marker M1 in the alignment marker M2. Since the alignment marker M2 has a long hole shape, when manually aligning the terminal electrodes 3 and 4 with each other, θ
The alignment in the direction (the angle between the X1 axis and the Y1 axis in FIG. 4) can be made strict. That is, it is severe in the front-rear direction Y1, and has a margin in the left-right direction X1. When the alignment is automatically adjusted, the conventional alignment marker N2 and the reference marker N having a perfect circular shape are used.
The terminal electrode 3 and the terminal electrode 4 are aligned by reading the coordinates of the center of 1 and aligning the alignment by shifting the Y-axis by the distance H between the center of the elongated hole shape M1 and the center of the conventional alignment marker N2. FIG. 2 is a configuration diagram of a case where the alignment marker M2 according to the present invention is used and mounted on the liquid crystal display panel 1 and a case where alignment is automatically performed.

FIG. 3 shows an alignment marker M according to the present invention.
When using the flexible wiring board FC
When connecting the liquid crystal display panel 1 to the flexible wiring board F
FIG. 6 is a mounting diagram when C is shifted to the maximum in the θ direction. When the conventional alignment marker N2 is used, the alignment marker M2 according to the present embodiment is in the θ direction (FIG. 4) as compared with FIG. It can be seen that the positional deviation is suppressed with respect to the alignment (the angle between the X1 axis and the Y1 axis).

As described above, according to the present embodiment, when the alignment is manually performed, the flexible wiring board F
When the liquid crystal display panel 1 is connected to the liquid crystal display panel C, a shift in the θ direction (alignment shift) can be minimized.
As a result, when the flexible wiring board FC and the printed wiring board PC are connected, the deviation in the θ direction between the terminal electrodes 3 and the terminal electrodes 4 is large due to the connection between the terminal electrodes 3 and the terminal electrodes 5 on the printed wiring board side. The situation of shifting in the θ direction can be suppressed (see FIG. 3). In addition, it is possible to minimize the misalignment in the θ direction and make it less severe than the allowable value for alignment in the X1 direction. That is, according to the present embodiment, when the alignment is manually performed, the alignment marker M2 and the reference marker N1 can be easily aligned.
Work efficiency can be expected to be higher than in the conventional alignment marker M2, in which the θ direction is made strict, and the diameter of the alignment marker N2 and the reference marker N1 are made substantially the same.

Further, whether or not the alignment marker M2 of the flexible wiring board FC according to the present embodiment has the shape as designed and whether there is no variation depending on the manufacturing lot is determined.
Management is possible only by measuring between straight lines that only measure the radius of the straight portion and the semicircular portion of the elongated hole shape. This eliminates the need to measure the curve R as compared with the case where an alignment marker M4 described later is formed into an ellipse, thereby realizing easy management.

Here, although the alignment marker M2 of the flexible wiring board FC is formed only on the metal foil such as the copper foil of the conductive portion 3, the alignment marker M2 of the flexible wiring board FC is penetrated through the flexible wiring board FC. It is also possible to form with a hole. The advantage of forming the conductive portion 3 only on a metal foil such as a copper foil is that the variation of the shape and accuracy of the alignment marker M2 due to the manufacturing process is reduced as compared with the case where the conductive portion 3 is formed by penetrating a hole in the flexible wiring board FC. The advantage in the case where the alignment marker M2 is formed by a hole penetrating the flexible wiring board FC is that the alignment marker M2 is more accurate and more manufactured than the case where the conductive portion 3 is formed in a metal foil such as a copper foil. Although the variation of each alignment slightly decreases, the position of the alignment marker can be easily changed.

(Second Embodiment) As shown in FIG. 5, an alignment marker M3 according to the present embodiment has an alignment marker M3 for positioning, which is larger than a circular reference marker M1 on the flexible wiring board FC. Are provided in a rectangular shape on the left and right. In the front-rear direction Y2 of the rectangular alignment marker M3, the distance is substantially the same as the diameter S of the circular reference marker M1.
Is formed to be longer than the diameter S of the circular reference marker M1.

In this embodiment, as in the first embodiment, since the dimension Y2 in the front-rear direction (dimension in the short side direction) is strict, the θ direction (the X2 axis and the Y2 axis) In addition to the above, it is possible to suppress the positional deviation due to the angle between the alignment marker M3 and the dimension X2 in the left-right direction (dimension in the long side direction). Positioning is facilitated.

(Third Embodiment) As shown in FIG. 6, an alignment marker M4 of the present embodiment is provided with an alignment marker M4 for positioning, which is larger than the circular reference marker M1, on the flexible printed circuit board FC. A pair of right and left is provided in a parallelogram shape. The short side direction (front-rear direction) Y4 of the parallelogram-shaped alignment marker M4 having a short opposing inner peripheral distance is made stricter to the movement of the perfect circular reference marker M1, and the opposing inner peripheral distance is long. Since there is a margin in the long side direction (horizontal direction) X3, it is possible to suppress the displacement in the θ direction (the angle between the X3 axis and the Y3 axis) and to reduce the alignment marker M4.
Also becomes easier. If the shape is such a parallelogram, the inclination direction does not matter and is included in the present invention.

(Fourth Embodiment) As shown in FIG. 7, the alignment marker M5 of the present embodiment has an oval alignment marker M5 on the flexible printed circuit board FC with respect to the circular reference marker M1. It is provided in a shape. The elliptical shape is as close as possible to a square shape having a pair of parallel long sides as in the first and second embodiments. Even if it is provided,
5, since the dimension with respect to the reference marker M1 is strict, and the dimension with respect to the reference marker M1 has a margin in the left-right direction X5, it is possible to expect substantially the same operation and effect as in the first to third embodiments. . Also, as shown in FIG. 8, even if the diamond-shaped alignment marker M6 is provided, substantially the same operation and effect as those of the first to third embodiments can be expected. However, each alignment marker M
For the accuracy of 2, M3, M4, M5, the elliptical shape M5
In the case of, it is necessary to manage the curve R of the curve, but the oblong shape, the rectangular shape,
Alternatively, in the case of square alignment markers M2, M3, and M4 having different diagonal distances, there is an advantage that the linear portion can be managed by measuring only the linear distance.

As described above, in each of the above embodiments, the case where the present invention is applied to a liquid crystal display device typified by COG mounting has been described. However, the present invention relates to a display device other than the liquid crystal display device and a wiring having terminal electrodes. Connection between the board and the wiring board, that is,
It can be widely applied to connection of general wiring boards.

[0036]

According to the connection structure of the wiring board of the present invention,
Compared with the conventional alignment of markers with perfect circular shapes,
A long hole shape or an elliptical shape having a pair of parallel long sides of the alignment marker, or a square shape in which one diagonal line is longer than the other diagonal line, in its narrow front-rear direction, its dimensions are strict, so the rotation direction In addition, the positional deviation caused by the alignment marker can be suppressed within a predetermined range, and the long dimension in the left-right direction has more room than before, so that the alignment of the alignment marker with respect to the circular reference marker becomes easy. Therefore, particularly, the positioning operation when manually performing the positioning can be easily performed. In other words, the advantage of the conventional alignment of the perfect circles, which facilitates the alignment, is developed, so that the alignment can be performed more easily and the displacement in the rotation direction can be suppressed within a predetermined range.

[0037]

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a flexible wiring board and a liquid crystal display panel according to a first embodiment of the present invention, wherein a plan view is shown on the left side and a cross-sectional view is shown on the right side.

FIG. 2 is a mounting diagram of a flexible wiring board and a liquid crystal display panel according to the first embodiment.

FIG. 3 is a mounting diagram when the flexible wiring board in the first embodiment is displaced in the θ direction.

FIG. 4 is a diagram showing a relationship between a reference marker and an alignment marker according to the first embodiment.

FIG. 5 is a diagram showing a relationship between a reference marker and an alignment marker according to the second embodiment of the present invention.

FIG. 6 is a diagram illustrating a relationship between a reference marker and an alignment marker according to a third embodiment of the present invention.

FIG. 7 is a diagram illustrating a relationship between a reference marker and an elliptical alignment marker according to a fourth embodiment of the present invention.

FIG. 8 is a diagram showing a relationship between a reference marker and a diamond-shaped alignment marker according to a fourth embodiment of the present invention.

FIG. 9 is a general configuration diagram of a COG mounting type liquid crystal display device.

FIG. 10 is a diagram showing a conventional reference marker and alignment marker.

FIG. 11 is a mounting diagram of a conventional flexible wiring board and a liquid crystal panel.

FIG. 12 is a mounting diagram when the conventional flexible wiring board is shifted in the θ direction.

FIG. 13 is a diagram showing an example of displacement of a flexible wiring board.

FIG. 14 is a diagram showing the relationship between the displacement of the flexible wiring board in the θ direction and the terminal electrodes.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 1A One wiring board of a liquid crystal display panel 3 Conductive terminal part (metal foil) of a flexible wiring board 4 Terminal electrode of a liquid crystal panel 5 Terminal electrode of a printed wiring board 6 Non-conductive film (cover) of a flexible wiring board 7 Non-conductive film (base film) of flexible wiring board 9 Overhead wire of terminal electrode when alignment is perfectly aligned H Distance between center of elongated hole shape and center of conventional alignment marker M1 Reference marker M2, M3, M4, M5, M6 Alignment Marker N1 Conventional Reference Marker N2 Conventional Alignment Marker FC Flexible Wiring Board PC Printed Wiring Board IC Driving Semiconductor Element

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05K 3/00 H05K 3/00 PF term (Reference) 2H092 GA40 GA50 GA57 GA60 NA27 PA06 5E338 AA12 CC10 DD12 DD32 EE31 EE32 EE41 5E344 AA02 BB02 BB04 CC30 EE21 EE23 5G435 AA17 BB12 CC09 EE32 EE34 EE37 EE40 EE42 HH12 HH14 KK03 KK05

Claims (3)

[Claims] An electric circuit is provided in which one of the wiring boards having terminal electrodes and the other of the wiring boards having terminal electrodes are electrically positioned while performing front-rear, left-right positioning with reference to a pair of left and right markers provided respectively. In the connection structure of the wiring board connected to the wiring board, a pair of right and left perfect circular reference markers is provided on one wiring board, and an alignment marker corresponding to the perfect circular reference marker is provided on the other wiring board with a pair of parallel lengths. A pair of left and right holes having a side portion or an elliptical shape or one diagonal line is provided as a pair of left and right sides as a rectangular shape longer than the other diagonal line. The rectangular shape longer than the diagonal line is large enough to include the reference marker, and narrow in the front-back direction.
A connection structure for a wiring board, which is formed to be long in the left-right direction. 2. A printed wiring board provided on a periphery of a liquid crystal display panel and provided with a driving semiconductor element for displaying the liquid crystal display panel, and a printed wiring board provided between the liquid crystal display panel and the printed wiring board for driving the display panel. A flexible wiring board for electrically connecting the semiconductor element and the driving semiconductor element of the printed wiring board; a pair of left and right sides each provided with one wiring board of a liquid crystal display panel having terminal electrodes and a flexible wiring board having terminal electrodes; In the connection structure of the wiring board for electrically connecting both terminal electrodes while performing front-rear, left-right alignment with reference to the marker, a pair of right and left circular holes is provided on one of the wiring boards or the flexible wiring board of the liquid crystal display panel. A fiducial marker is provided, and on the other hand, the above-mentioned circular circuit board is provided on one of the flexible printed circuit boards or the liquid crystal display panel corresponding thereto. A pair of left and right alignment markers corresponding to the reference markers are provided as a long hole shape or an elliptical shape having a pair of parallel long side portions or a square shape in which one diagonal line is longer than the other diagonal line, and has this pair of parallel long side portions. A long hole shape or an elliptical shape or a square shape in which one diagonal line is longer than the other diagonal line is a size that can include the reference marker, and the front-back direction is narrow,
A connection structure for a liquid crystal display panel, which is formed to be long in the left-right direction. 3. A printed wiring board provided on the outer periphery of the liquid crystal display panel and provided with a driving semiconductor element for displaying the liquid crystal display panel, and a printed wiring board disposed between the liquid crystal display panel and the printed wiring board for driving the display panel. A flexible wiring board for electrically connecting the semiconductor element and the driving semiconductor element of the printed wiring board; a pair of left and right sides each provided with one wiring board of a liquid crystal display panel having terminal electrodes and a flexible wiring board having terminal electrodes; In the connection structure of the wiring board that electrically connects both terminal electrodes while performing front-to-left and right-to-left alignment based on the marker, a pair of right and left perfect circular reference markers is provided on the flexible wiring board or the printed wiring board, On the other hand, on the printed wiring board or the flexible wiring board corresponding to these, the alignment corresponding to the above-mentioned circle-shaped reference marker is performed. A pair of left and right markers are provided as a pair of left and right as a long hole shape or an elliptical shape having a pair of parallel long side portions or a rectangular shape in which one diagonal line is longer than the other diagonal line. Alternatively, the connection structure of a liquid crystal display panel is characterized in that the rectangular shape in which one diagonal line is longer than the other diagonal line is large enough to include the reference marker, and is formed narrow in the front-back direction and long in the left-right direction.