JP2000231342A - Printing circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the connecting strength of electrodes for signal lines of a TAB and a printed circuit board. SOLUTION: A liquid crystal display device 10 comprises the printed circuit board 11, LCD glass 12 and the TAB 13. The TAB 13 comprises an LCD driver 31 installed on a base film 20, the electrodes 32 for the signal lines and TAB- fixing electrodes 33. The LCD glass 12 is connected to the one end in the longitudinal direction of the base film 20 having an approximately rectangular shape. The plural electrodes 32,..., 32 for the signal lines are installed in the portions existing on the inner side from the other end in the longitudinal direction of the base film 20. The four TAB-fixing electrodes 33 are installed at the outer peripheral part of the base film 20 in the peripheral parts of the electrodes 32,..., 32 for the signal lines on the base film 20. The electrodes 32 for the signal lines, the TAB-fixing electrodes 33 and the electrodes on the printed circuit board 11 are fixed by soldering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display (LC)
In D (Liquid Crystal Display), for example, a TAB (Tape Automated Bonus) used for connecting a liquid crystal display element or the like to an integrated circuit for driving the liquid crystal display element.
ding).

[0002]

2. Description of the Related Art Conventionally, for example, in a liquid crystal display device,
The liquid crystal display device is connected to a TAB (printed circuit) having a driver for driving the liquid crystal display device.
AB is configured by connecting a driver, which is, for example, an integrated circuit, mounted on a base film and a wiring pattern formed on the base film. As a liquid crystal display device in which such a TAB is directly soldered to a printed circuit board, there is known a liquid crystal display device in which only a signal line electrode portion of the TAB is fixed by soldering.

[0003]

In the above liquid crystal display device, the connection between the TAB and the printed circuit board is only at the portion of the signal line electrode of the soldered TAB. Therefore, when a stress is applied to the printed circuit board, there is a problem that the signal line electrode of the TAB peels off from the printed circuit board, and the signal line electrode of the TAB is broken. The present invention has been made in view of the above circumstances, and has as its object to provide a printed circuit capable of improving the connection strength between a TAB signal line electrode and a printed circuit board.

[0004]

In order to solve the above-mentioned problems and to achieve the above object, a printed circuit according to the present invention comprises a base on which an integrated circuit for driving a liquid crystal display device is mounted. A printed circuit formed by forming a wiring pattern bonded to the integrated circuit on a film, wherein the printed circuit includes a signal line electrode soldered to an electrode on a printed board, and a printed circuit board on the printed circuit board. And a fixing electrode for fixing the printed circuit on the printed circuit board by being soldered to the electrode.

In the printed circuit having the above-described structure, a fixing electrode for fixing the printed circuit on the printed circuit board is provided separately from a signal line electrode used for transmitting and receiving signals between the printed circuit and the printed circuit board. Since the electrodes provided on the circuit and the electrodes on the printed circuit board and the fixing electrodes are joined by soldering, for example, a device such as a mobile phone incorporating the printed circuit receives an impact due to a drop or the like. In this case, since the fixing electrodes of the printed circuit absorb the impact, the signal line electrodes of the printed circuit may be peeled off from the printed circuit board, or the signal may be disconnected between the printed circuit and the printed circuit board. Failures can be prevented.

Further, the printed circuit according to claim 2 is characterized in that the fixing electrode is provided on the base film on the outer peripheral side of the signal line electrode.

In the printed circuit having the above configuration, the fixing electrode is provided on the outer peripheral side of the signal line electrode on the base film of the printed circuit. Therefore, for example, the fixing electrode is formed so as to surround the signal line electrode. Even if stress is generated in the printed circuit board due to, for example, an impact due to the arrangement of the electrodes, these stresses are absorbed by the fixing electrode, so that the stress applied to the signal line electrode can be reduced. Thus, it is possible to further prevent a problem that the signal line electrode is peeled or disconnected.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the printed circuit according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a main part of a liquid crystal display device having a printed circuit according to an embodiment of the present invention. As shown in FIG. 1, a liquid crystal display (LCD) 10 including a printed circuit according to the present embodiment includes a printed circuit board 11, an LCD module 12 including an LCD glass 12 and a TAB (printed circuit) 13.
A.

The TAB 13 includes, for example, a base film 20 made of, for example, an organic film, and, for example, an L board which is provided on the base film 20 and controls the display of the liquid crystal display device 10.
An LCD driver 31 composed of an SI and a base film 20 for controlling the LCD driver 31 from outside.
It is composed of a signal line electrode 32 provided above and a TAB fixing electrode (fixing electrode) 33. The base film 20 has, for example, a substantially rectangular shape. For example, a rectangular plate-shaped LCD glass 12 is connected to one end in the longitudinal direction of the base film 20 installed on the printed circuit board 11. A signal line electrode 32 is provided at an appropriate position inside the other end of the base film 20 in the longitudinal direction, and the signal line electrode 32 has an appropriate length along the longitudinal direction of the base film 20. Also, for example, a plurality of signal line electrodes 32,..., 32 are arranged at predetermined intervals in the width direction of the base film 20. An LCD driver 31 is mounted on the center portion of the base film 20 in the longitudinal direction, and is connected to the signal line electrode 32 by, for example, a wiring pattern provided on the base film 20.

On the other end in the longitudinal direction of the base film 20, that is, on the side on which the signal line electrode 32 is provided, a plurality of, for example, four TAB fixing electrodes 33, 33, 33, 33 are provided. Four TAB fixing electrodes 33, 33, 33, 3
3, two of the TAB fixing electrodes 33, 33 are disposed at, for example, two corners at the other end in the longitudinal direction of the base film 20, and the other two TAB fixing electrodes 33, 33 are provided.
Each of the B-fixing electrodes 33 is disposed so as to oppose each other at an appropriate position in the longitudinal direction at two opposing long sides on the outer peripheral portion of the base film 20. Here, the TAB fixing electrodes 33, 33, 33,
33 are not connected to the signal line electrodes 32,..., 32. A plurality of signal line electrodes 32,..., 32 of the TAB 13 and TAB fixing electrodes 33, 3 are provided on the printed circuit board 11.
For example, an electrode or the like is provided opposite to each of the electrodes 3, 33, 33, and the signal line electrodes 32,.
The B fixing electrodes 33, 33, 33, 33 and the electrodes on the printed circuit board 11 are fixed by soldering.

According to the printed circuit of the present embodiment, T
In addition to the signal line electrode 32 used for transmitting and receiving signals between the AB 13 and the printed board 11, a TAB fixing electrode 33 for fixing the TAB 13 on the printed board 11 is provided on the outer periphery of the base film 20 of the TAB 13. Since the electrode on the printed circuit board 11 and the TAB fixing electrode 33 are joined by soldering, for example, a device such as a mobile phone incorporating the TAB 13 may be subjected to an impact caused by dropping or the like. Even when stress is generated on the printed circuit board 11 when the printed circuit board 11 receives the
Since the fixing electrode 33 absorbs, the stress applied to the signal line electrode 32 can be reduced. This gives T
It is possible to prevent separation, disconnection, and the like from occurring at the joint between the signal line electrode 32 of the AB 13 and the electrode of the printed circuit board 11.

In this embodiment, a plurality of TAB fixing electrodes 33, 3 are provided on the outer peripheral portion of the base film 20.
Although it is assumed that 3, 33, and 33 are provided, the present invention is not limited to this. A plurality of TAB fixing electrodes 33 may be provided at appropriate positions inside the outer peripheral portion of the base film 20. In short, in the peripheral portion of the signal line electrode 32,
For example, the TAB fixing electrode 33 may be arranged so as to surround the signal line electrode 32. In the present embodiment, the four TAB fixing electrodes 33, 33, 33, 33 are provided on the outer peripheral portion of the base film 20, but the present invention is not limited to this. For example, the TAB fixing electrodes 33 are provided. Base film 2 without providing
, 32 arranged at a predetermined interval in the width direction of 0, two signal line electrodes 32, 32 located at both ends are so-called dummy, and TA
It may be used for fixing B13.

[0013]

As described above, according to the printed circuit of the present invention, apart from the signal line electrode, the fixing electrode for fixing the printed circuit on the printed circuit board is provided. Since the electrodes on the printed circuit board and the fixing electrode are joined by soldering, even when a shock is received, the fixing electrode of the printed circuit absorbs the shock, It is possible to prevent problems such as peeling of the signal line electrode of the printed circuit from the printed circuit board and disconnection of the signal between the printed circuit and the printed circuit board. Furthermore, according to the printed circuit of claim 2,
On the base film of the printed circuit, since the fixing electrode is provided on the outer peripheral side than the signal line electrode, even when stress is generated on the printed circuit board due to impact or the like,
Since these stresses are absorbed by the fixing electrode, the stress applied to the signal line electrode can be reduced, and the problem that the signal line electrode is separated or disconnected can be further prevented. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a liquid crystal display device including a printed circuit according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Liquid crystal display device 11 Printed circuit board 12 LCD glass 13 TAB 20 Base film 31 LCD driver 32 Signal line electrode 33 TAB fixing electrode

Claims (2)

[Claims] 1. A printed circuit comprising a base film on which an integrated circuit for driving a liquid crystal display device is mounted and a wiring pattern bonded to the integrated circuit, wherein the printed circuit is a printed circuit board. A signal line electrode soldered to the upper electrode, and a fixing electrode for fixing the printed circuit on the printed board by being soldered to the electrode on the printed board. Printed circuit featured. 2. The printed circuit according to claim 1, wherein the fixing electrode is provided on an outer peripheral side of the signal line electrode on the base film.