JP2882967B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TAB (Tape Automated Bonded) having a liquid crystal display element and an integrated circuit for driving.
ng), or FPC (Flexible Printed Circuit),
Printed circuit boards such as TPC (Tape Carrier Package)
The present invention relates to a liquid crystal display device which is aligned using an alignment recognition marker and then connected via an anisotropic conductive film or the like.

[0002]

2. Description of the Related Art As a liquid crystal display device, there is one using, for example, a TAB having an integrated circuit mounted in a center portion in a mounting structure. In such a liquid crystal display device, a COM electrode (row electrode) is formed. COM side substrate and SEG electrode (column electrode)
A liquid crystal display element comprising a SEG-side substrate on which
A plurality of TABs connected to the COM side and the end side of the SEG side substrate of the liquid crystal display element and mounted with an integrated circuit for driving the liquid crystal display element.

[0003] On the COM side and the SEG side of the liquid crystal display element, connection electrodes composed of a large number of terminals are formed at predetermined intervals on the end side of the substrate. A TAB electrode, which is an output electrode composed of a number of terminals corresponding to each of the connection electrodes on the substrate, is formed. These connection electrodes and the TAB electrode are
After predetermined terminals are positioned so as to face each other, they are electrically connected using, for example, an anisotropic conductive film.

In order to facilitate the alignment between the connection electrode and the TAB electrode, both ends of the connection electrode and the TAB electrode are connected.
At both ends of the B electrode, one type of recognition marker for alignment corresponding to the terminal pitch is formed, and a predetermined magnification (according to the size of the recognition marker) of the alignment device equipped with the microscope is provided. Positioning is performed by overlapping the corresponding recognition markers within the field of view.

On the other hand, liquid crystal display devices include a monochrome liquid crystal display device and a color liquid crystal display device, for example, 640 × 48.
In a 0-dot black-and-white liquid crystal display device, the connection electrodes on the COM-side substrate and the connection electrodes on the SEG-side substrate have substantially the same terminal pitch. On the other hand, a color liquid crystal display device needs three outputs of RGB for one output of a monochrome liquid crystal display device. Therefore, when the dot pitch is the same as that of a monochrome liquid crystal display device, one black and white dot is divided into three. Only the connection electrodes of the SEG-side substrate have a narrow terminal pitch and an increased number of terminals. The connection electrodes on the COM-side substrate are the same as those of the monochrome liquid crystal display device having the same dot pitch.

Therefore, conventionally, in order to reduce the manufacturing cost, in a black-and-white and color liquid crystal display device having the same dot pitch, a black-and-white and color liquid crystal display device has a C.C.
The TAB connected to the OM side substrate is shared.

[0007]

However, in a black and white and color liquid crystal display device having the same dot pitch, TAB connected to the COM side substrate in each liquid crystal display device.
When used in common, there is a problem that workability is remarkably reduced in a step of connecting a liquid crystal display element and a TAB in a color liquid crystal display device.

That is, as described above, the COM side and SE
The connection electrodes on the G-side substrate and the TA of the corresponding TAB
A single alignment device equipped with a microscope is used for connection with the B electrode. However, in the current alignment device, when the magnification is changed, the microscope is replaced by exchanging the microscope. I have.

In this case, in a monochrome liquid crystal display device,
Since the connection electrodes on the COM-side substrate and the connection electrodes on the SEG-side substrate have substantially the same terminal pitch, the recognition markers for alignment used for connection with the TAB electrode have substantially the same size corresponding to each terminal pitch. Therefore, the alignment at the time of connection between the liquid crystal display element and the TAB in the black-and-white liquid crystal display device is performed at a constant magnification of, for example, about 50 times without any complicated work such as replacing a microscope. Has been established.

On the other hand, in the color liquid crystal display device, the TAB connected to the COM side substrate is shared with the black and white liquid crystal display device and is a recognition marker to be viewed at a magnification of about 50 times. The recognition marker used for connection between the side substrate and the TAB should be viewed at a magnification of about 150 times in accordance with the terminal pitch of the connection electrode that has been narrowed (this is because the terminal pitch is narrowed, This is because the formation area of the recognition marker was narrowed with the increase in the number of terminals.) Therefore, when connecting the liquid crystal display element to each TAB, the operator is forced to exchange microscopes on the COM side and the SEG side one by one.

Therefore, the present invention is based on the premise that a TAB is shared by various types of models, and a liquid crystal display with good workability in the connection process between the liquid crystal display element and each printed circuit board while achieving the sharing. It is intended to provide a device.

[0012]

A liquid crystal display device according to the present invention has a liquid crystal display element having a plurality of terminals formed with connection electrodes and an output electrode having a plurality of terminals corresponding to the connection electrodes. With a printed circuit board, the connection electrode of the liquid crystal display element and the output electrode of the printed circuit board, after undergoing alignment using a recognition marker for alignment,
In the liquid crystal display device connected via the connection means, a plurality of recognition markers for positioning are formed on the printed circuit board so as to be recognized in fields of view having different magnifications.

[0013]

According to the above arrangement, the printed circuit board connected to the liquid crystal display element is provided with a plurality of position-recognition recognition markers which are recognized in fields of view having different magnifications.
Therefore, for example, this configuration is incorporated in a printed circuit board such as TAB connected to the COM side substrate shared between the monochrome liquid crystal display device and the color liquid crystal display device, and the position of the printed circuit board with respect to the liquid crystal display element is changed. The matching recognition marker is replaced with a conventional recognition marker by using the SEG side substrate and S
In addition to the two types of recognition markers having different magnifications used for connection with the printed circuit board on the EG side, when manufacturing a color liquid crystal display device, the same size as that provided on the SEG side is used. By using the recognition marker, the printed circuit board is shared between the monochrome liquid crystal display device and the color liquid crystal display device, and the connection between the liquid crystal display element and the printed circuit board in the manufacturing process of the color liquid crystal display device. Workability at the time can be improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The liquid crystal display device according to the present embodiment is a color liquid crystal display device, and a COM-side TAB 30 which is a printed circuit board connected to the COM-side substrate shown in FIG.
It is intended to be shared with other models having the same dot pitch, for example, a black and white liquid crystal display device.

As shown in FIG. 5, the above liquid crystal display device
A liquid crystal display element 10, a plurality of large and small printed circuit boards constituting a driver for driving the liquid crystal display element 10, ie, SEG-side TABs 20,.
...

As shown in FIG. 1A, the COM-side TAB 30 has a base film 31 (length × width; 18.0 mm × 25.0 mm) made of a thin organic film. Is provided with a TAB electrode (output electrode) 33 composed of a plurality of terminal electrodes 33a, one end of which is connected to a connection terminal (not shown) of the integrated circuit. The terminal pitch of the TAB electrode 33 is the same as the liquid crystal display element 1 described later.
0, the connection electrode 16 provided on the COM-side substrate 12
Terminal pitch. Also, base film 3
At both ends of the TAB electrode 33 in 1, recognition markers 34 for alignment in connection with the liquid crystal display element 10 are coated with a copper laminate film by photoresist, exposed to light, developed, and then etched. That is, it is formed by so-called photolithography.

The recognition markers 34 are substantially square-shaped in plan view, and are conventionally large-sized markers 34a.
And a newly added small size marker 34b having a substantially rectangular shape in a plan view, as shown in FIG.
As shown in FIG. 3 (c), which is an enlarged view of a portion surrounded by a circle, the large size marker 34a is considered from the terminal pitch of the TAB electrode 33, which corresponds to approximately three terminal electrodes 33a. Having a size, while a small size marker 34
b is a recognition marker 2 formed on the SEG-side TAB 21 to be described later, which is about 1/3 of the large size marker 34a.
4 has almost the same size.

On the other hand, the SEG side TAB 20 is shown in FIG.
As shown in the figure, a base film 21 (length × width; 14.0 mm × 16.0 mm) made of a thin organic film smaller than the base film 31 of the COM-side TAB 30 is provided. Like the COM-side TAB 30, the integrated circuit 22 is mounted, and the terminal is composed of a plurality of terminal electrodes 23a.
TA having a narrower terminal pitch than the TAB electrode 33 of the AB 30
A B electrode (output electrode) 23 is formed. This TAB
The terminal pitch of the electrode 23 corresponds to the terminal pitch of the connection electrode 19 provided on the SEG-side substrate 11 in the liquid crystal display element 10 described later. Further, similarly to the above, at both ends of the TAB electrode 23 on the base film 21,
The recognition markers 24 are each formed by photolithography. This recognition marker 24
Is a substantially rectangular shape in plan view, and as shown in FIG. 3C, which is an enlarged view of a portion surrounded by a circle in FIG.
It has a size corresponding to the terminal pitch of the TAB electrode 23, which corresponds to approximately three lines 3a.

As shown in FIG. 5, the liquid crystal display element 10 has a pair of SEG electrodes (column electrodes) and COM electrodes (row electrodes) (not shown) formed on respective opposing surfaces, and a pair of SEG electrodes and COM electrodes. It has side substrates 11 and 12.
The two opposite sides of the SEG-side substrate 11 and one side of the COM-side substrate 12 have the SEG-side and COM-side T
The connection parts 13 and 14 with AB20 ... 30 are formed.

The connecting portion 13 to which the SEG-side TABs 20 are connected has a connecting electrode 18 made of, for example, an ITO film as shown in FIG. 3B and a plurality of terminal electrodes to which the SEG-side TABs 20 are connected. A plurality of the connection electrodes 18 are formed at predetermined intervals, and at both ends of each connection electrode 18,
A recognition marker 19 corresponding to the positioning recognition markers 24 provided on the SEG-side TAB 20 described above.
-19 are formed.

Similarly, the connecting portion 14 to which the COM-side TABs 30 are connected is connected to the COM-side TAB 30 shown in FIG.
A plurality of connection electrodes 16 including a plurality of terminal electrodes to which the AB 30 is connected are formed at predetermined intervals, and
The above-mentioned COM-side TAB is provided at both ends of each connection electrode 16.
Recognition marker 34.3 for positioning provided in 30
4, the recognition markers 17 corresponding to the large size marker 34a and the small size marker 34b,
A large size marker 17a and a small size marker 17b are formed.

The liquid crystal display element 10 and the SEG
When connecting the side- and COM-side TABs 20... 30, first, conductive film forming regions A and D made of an anisotropic conductive film (not shown) are formed at the connection portions 13 and 14 of the liquid crystal display element 10. Next, using a positioning device (not shown), the recognition markers 19 of the connecting portion 13 and the TAB on the SEG side are used.
While recognizing the 20 recognition marks 24 in the enlarged field of view of, for example, a microscope of about 200 times provided in the positioning device, the connection electrodes 18 of the connection section 13 and SE are recognized.
The TAB electrodes 23 of the G-side TABs 20 are aligned and temporarily fixed so as to face each other (see FIG. 4). Next, at the same magnification, the recognition marker 17
Using the 17 small size markers 17b and 17b and the small size markers 34b and 34b of the recognition marks 34 and 34 in the COM-side TAB 30, the connecting electrodes 16 of the connecting portion 14 and the TAB electrodes 33 of the COM-side TAB 30. And are temporarily fixed so as to face each other (see FIG. 2). In this case, in this case, the large size markers 34a and 3
4a is not used because the magnification of the visual field is different. The large-sized markers 34a are used in manufacturing a monochrome liquid crystal display device.

In this manner, the SEG side and the COM side T
After temporarily fixing AB20 ... 30 ..., SEG side, COM
For example, a pressure of 20 kg / cm ² is applied at 190 ° C.
The thermocompression bonding is performed by adding each of the TABs 20... 30. Thus, the liquid crystal display element 10 and the TAB on the SEG side and the COM side
20... 30... Are electrically connected.

As described above, in this embodiment, the connection electrodes 16 provided on the COM-side substrate 12 of the liquid crystal display element 10 are used to align the TAB electrodes 33 of the COM-side TABs 30. Recognition marker 17, 17, 3
4 and 34 are conventional large-sized markers 17a corresponding to the terminal pitch of the connection electrode 16 (TAB electrode 33).
17a, 34a, 34a, connection electrodes 18 provided on the SEG-side substrate 11, and TAs of the SEG-side TABs 20.
Recognition marker 1 used for alignment with B electrode 23
It is composed of small size markers 17b, 17b, 34b, 34b having a size substantially equal to that of 9.1, 19, 24, 24.

Therefore, when aligning the liquid crystal display element 10 with the SEG-side and COM-side TABs 20... 30 using the same alignment device, the recognition markers 19, 19, 24 used to connect the SEG-side TABs 20.・ Small size markers 17b, 17b, 3 of the same size as 24
By using the 4b and 34b to align the COM-side substrate 12 and the COM-side TABs 30..., It is possible to replace the microscope of the alignment device between the COM side and the SEG side one by one as in the related art. Positioning can be performed without trouble. As a result, even if the COM-side TAB 30 that is shared with many types of models is used to reduce the manufacturing cost, the workability is significantly improved, and the manufacturing cost can be further reduced. .

[0027]

As described above, the liquid crystal display device of the present invention has a configuration in which a plurality of alignment recognition markers that are recognized in fields of view having different magnifications are formed on the printed circuit board.

Thus, for example, this configuration is incorporated in a printed circuit board such as TAB connected to the COM side substrate shared between the monochrome liquid crystal display device and the color liquid crystal display device, and the liquid crystal display of the printed circuit board is used. The recognition marker for alignment with the element is replaced with a conventional recognition marker by using SE.
By adding two types of recognition markers used to connect the G side board and the SEG side printed circuit board, the printed circuit board can be shared between the monochrome liquid crystal display device and the color liquid crystal display device. In addition, it is possible to improve the workability when connecting the liquid crystal display element and the printed circuit board in the manufacturing process of the color liquid crystal display device.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a plan view of a COM-side TAB connected to a COM-side substrate,
(B) is a plan view showing a main part of the COM-side substrate, and (c) is an enlarged view of a part circled in (a).

FIG. 2 is a plan view showing a state where a COM-side substrate and a COM-side TAB are aligned;

FIG. 3 (a) is an SEG side T connected to the SEG side substrate.
FIG. 2B is a plan view of AB, FIG. 2B is a plan view showing a main part of the SEG-side substrate, and FIG. 2C is an enlarged view of a part circled in FIG.

FIG. 4 is a plan view showing a state where the SEG-side substrate and the SEG-side TAB are aligned.

FIG. 5 is a plan view of a liquid crystal display device including a COM-side and SEG-side substrate and a COM-side and SEG-side TAB connected thereto;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Liquid crystal display element 11 SEG side board 12 COM side board 13 Connection part 14 Connection part 16 Connection electrode 17 Recognition marker 17a Large size marker 17b Small size marker 18 Connection electrode 19 Recognition marker 20 SEG side TAB (printed circuit board) 23 TAB electrode (Output electrode) 24 Recognition marker 30 COM side TAB (Printed circuit board) 33 TAB electrode (Output electrode) 34 Recognition marker 34a Large size marker 34b Small size marker

Claims (1)

(57) [Claims] 1. A liquid crystal display device comprising: a liquid crystal display element having a plurality of terminals formed with connection electrodes; and a printed circuit board having a plurality of output electrodes corresponding to the connection electrodes formed thereon. In a liquid crystal display device in which a connection electrode and an output electrode of a printed circuit board are positioned via a positioning recognition marker and then connected via connection means, the printed circuit board may have a different magnification. A liquid crystal display device comprising a plurality of alignment recognition markers that are recognized in a visual field.