JPH10294332A - Tape carrier package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reinforce the terminal parts of a tape carrier package without making large the size of the external shape of the terminals and to prevent the generation of a disconnection of the terminals due to vibrations by a method wherein when the terminals are provided on the peripheral edge parts of a base film in parallel to each other in a row shape, the width of the terminals, which are positioned on both end sides of the rows, is made wider than that of the terminals, which are positioned in the central parts of the rows. SOLUTION: When output terminals 5 are provided on the peripheral edge parts of a base film 1 in parallel to each other in a row shape, the width of the terminals 5, which are positioned on both end sides of the rows, is made wider than that of the terminals 5, which are positioned in the central parts of the rows. Moreover, panel terminals of the same width are installed on an LCD panel in the state corresponding to the terminals 5 of the different widths and the terminals 5 to correspond to the panel terminals and the panel terminals are connected with each other via an anisotropic conductive film. Accordingly, regardless of the positions of the rows, the distributions of stresses, which are respectively applied to each output terminal 5, become roughly uniform. In such a way, as the widths of the terminals 5 are formed wider as the terminals 5 become more distant from the center parts of the rows to the outside, it is eliminated that a large force is applied to the specified terminals and a disconnection of the connection parts of the terminals 5 with the panel terminals hardly generates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape carrier package (hereinafter, referred to as TCP), and more particularly to a width and a shape of a TCP terminal used for a liquid crystal display device.

[0002]

2. Description of the Related Art Conventional tape carrier packages (TC)
P) is a tape-shaped connection terminal in which a copper foil is adhered on a base film 1 made of polyimide, as shown in FIG. 5, and is used by being bent to connect the driving IC 4 to an LCD panel and a printed circuit board. It had been. 2 is the bend, 3
Is a resist and 5 is an output terminal.

[0003] TCP connected to terminal of LCD panel
Output terminals 5 are arranged at equal pitches and equal widths in parallel to the length direction.
Approximately 40 to 320 lines are arranged. In recent narrow-pitch products, the terminal width has been reduced to about 40 μm at a pitch of 70 μm.

FIG. 3 is a cross-sectional view showing a mounted state of a TCP which is used in a bent state. The TCP is bent at a bent portion 2 so that an output terminal 5 is printed on an LCD panel 7 and an input terminal 6 is printed. It is connected to a substrate 8 via an anisotropic conductive film 9, and has a structure in which a backlight 10 is sandwiched between an LCD panel 7 and a printed circuit board 8.

[0005] By the way, the conventional TCP shown in FIG.
However, there is a problem that the copper foil wiring of the bent portion 2 is broken due to being weak to stress due to a drop or vibration of the product.

Therefore, as a method of reinforcing the bent portion 2, a technique disclosed in Japanese Patent Application Laid-Open No. 6-31047 is disclosed in FIG.
As shown in (a), a pair of dummy leads 11, 1
1 are formed on both sides of the output terminal 5, and the stress applied to the output terminal 5 is reduced by concentrating the stress on the wide dummy lead 11. FIG. 7 (b)
As shown in (1), the outermost output terminal 12 is formed wider than the other output terminals 5, and the bent portion is reinforced.

[0007]

However, FIG.
When the bent portion 2 is reinforced as shown in FIGS. 3A and 3B, the rigidity of the bent portion 2 is increased, so that the stress due to the vibration is applied to the connection boundary a between the LCD panel 7 and the TCP in FIG. In addition, there is a problem that the terminal in this portion is disconnected.

FIG. 6 is a diagram viewed from the side when the TCP is mounted. The stress caused by the vibration is applied to the LCD panel 7
Due to the difference between the bending of the printed circuit board 8 and the stress of the printed circuit board 8, a stress as shown by an arrow is applied to the TCP. This stress is, as shown in the figure, TCP
Is larger on both sides of the terminal, so that several lines are disconnected from the outside of the terminal. When the applied vibration is further increased, the disconnection spreads to the further inner terminal.

As shown in FIG. 7, when only the both sides of the terminal row are reinforced, the reinforcement is insufficient, and it is impossible to prevent disconnection due to vibration. In order to solve this problem, if the width of all the terminals is widened, the external size of the TCP becomes large, so that there has been a problem that mounting on a high-definition panel becomes impossible.

It is an object of the present invention to provide a tape carrier package in which a terminal portion is reinforced without increasing the external size and breakage due to vibration is prevented.

[0011]

In order to achieve the above object, a tape carrier package according to the present invention is a tape carrier package having terminals on a base film, wherein the terminals are used for connection to an external circuit. The terminals are provided in a row parallel to the peripheral edge of the base film, and the terminals are reinforced by making the widths at both ends wider than the center of the row.

The width of the terminal is gradually increased from the center to the both ends of the row.

The terminals from the center to the both ends of the row are divided into groups, and the widths of the grouped terminals are set to be gradually wide in groups from the center of the row to both ends. It is a thing.

Each of the terminals has a different overall width.

In each of the terminals, the width of only the portion requiring reinforcement is changed.

[0016]

FIG. 4 shows a cross section of the output terminal portion when the TCP is mounted on the LCD panel in the present invention. When a force as shown in FIG. 6 is applied to the TCP due to the vibration, a strong force is applied to the output terminals from the center of the row to the output terminals at both ends. However, in the present invention, the width of the output terminals located at both ends of the column is increased from the output terminals at the center of the column to reinforce the output terminals, and the stress distribution applied to each output terminal is independent of the position of the column. It is almost uniform. As described above, the terminal width is changed to be wider as the distance from the center of the row to the outer side is increased, so that a large force is not applied to a specific terminal, and disconnection of the connection portion is less likely to occur.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 is a plan view showing a tape carrier tape according to Embodiment 1 of the present invention.

In the figure, TCP base film 1
Is formed in a rectangular shape, and an output terminal 5 and an input terminal 6 are provided at both ends. Output terminal 5 and input terminal 6
Are used for connection to an external circuit, and are provided in a row in parallel with the peripheral portion of the base film 1.

The base film 1 includes a driving IC 4
Is mounted, and the input side electrode of the driving IC 4 is connected to the input terminal 6 via the wiring (not shown) of the base film 1.

The base film 1 has two bent portions 2 and 2 punched out on the output terminal 5 side, and is bent at the bent portion 2.
4 output side electrodes and wiring of the base film 1 (not shown)
Connected through.

The wiring of the base film 1 is made of copper foil formed on the base film 1 via an adhesive layer, and the wiring on the output terminal 5 side is wired across the bent portion 2. It is bent at the bent portion 2. The surfaces other than the terminals 5 and 6 and the bent portion 2 are covered with the resist 3, and the surface of the wiring crossing the terminals 5 and 6 and the bent portion 2 is plated with Sn.

Further, in the first embodiment of the present invention, the output terminal 5 is reinforced by gradually increasing its width from the center of the row to both ends. Further, in the first embodiment of the present invention, the pitch and width of the output terminals 5 at the center of the column are set slightly smaller than in the conventional case in order to make the outer dimensions of the TCP the same as in the conventional case.

The tape carrier package according to the first embodiment of the present invention is mounted in the same mounting posture as the conventional one as shown in FIG. 3, but is compatible with the output terminals 5 having different width dimensions as shown in FIG. Then, the panel terminals 13 having the same width are set on the LCD panel 7, and the corresponding output terminals 5 and panel terminals 13 are provided.
Are connected via an anisotropic conductive film 9. Since all the panel terminals 13 have the same width, the wiring resistance is substantially uniform.

Next, the tape carrier package according to the first embodiment of the present invention will be described using examples in which specific numerical values are increased.

The thickness of the base film 1 was 75 μm, and the thickness of the copper foil for wiring was 18 μm. This dimension is the same as the conventional one.

The width of the output terminals 5 at both ends of the row on the base film 1 is 70 μm,
The width of the output terminal 5 was 68 μm in the first row and 66 μm in the third row, and the width of the output terminal 5 was reduced by 2 μm toward the center of the row. The space between the output terminals 5 and 5 was 30 μm as in the prior art. The width of the output terminal 5 at the center of the column is 38 μm, which is 2 μm narrower than the conventional one, so that a space for increasing the width of the output terminal 5 at both ends of the column is secured, and the outer dimensions of the TCP are reduced. The dimensions are the same as the size. Also,
The width of the output terminal 5 at the center of the column is 38 μm, so that the reliability of the connection portion is sufficiently ensured.

After setting the above design dimensions and conducting experiments,
Terminal breakage due to stress such as vibration was prevented.

In the first embodiment, the width of the output terminal 5 is gradually increased from the center of the row to both ends.
The output terminals 5 from the center of the column to both ends may be divided into groups, and the grouped output terminals 5 may be set to be wider stepwise from the center of the column to both ends in groups. More specifically, the width of the tenth terminal from both ends of the column is set to 70 μm, the width of the eleventh to twentieth terminals is set to 40 μm, and the width of the 21st and subsequent terminals is set to 38 μm. The output terminal 5 is reinforced. In this way, the width of the terminal is adjusted by dividing the terminal into groups, so that the terminal design is simplified.

(Embodiment 2) FIG. 2 is a plan view showing Embodiment 2 of the present invention.

In the first embodiment shown in FIG. 1, each output terminal 5
However, the output terminal 5 does not always need to be reinforced as a whole. In particular, the reinforced portion, for example, the root portion, or only a specific portion such as the tip portion may be reinforced. , Sometimes good.

Therefore, in the second embodiment of the present invention, each terminal 5 is subjected to reinforcement processing by changing only the width dimension of the portion 5a requiring reinforcement. In particular,
Only the portion 5a near the resist 3 side of the output terminal 5 was formed wide, and the remaining portion was 40 μm wide. in this way,
At locations where reinforcement is not required, there is the advantage that the terminal width is reduced and the space between the terminals is widened, so that a chute between the output terminals 5 due to foreign matter contamination can be prevented.

In the first and second embodiments, the width is changed only for the output terminal 5 for reinforcement. However, if it is necessary to reinforce the input terminal 6, this may be applied.

[0034]

As described above, according to the present invention, since the width of the terminal is adjusted to reinforce the terminal, the width of the terminal on which stress due to vibration is liable to be concentrated is changed to make the load uniform. And disconnection due to stress such as vibration can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

FIG. 3 is a sectional view showing a liquid crystal display device on which a tape carrier package is mounted.

FIG. 4 is a characteristic diagram showing a distribution of a stress applied to an output terminal by vibration.

FIG. 5 is a plan view showing a conventional example.

FIG. 6 is a characteristic diagram showing a distribution of a stress applied to an output terminal by vibration.

FIG. 7 is a plan view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base film 2 Bending part 3 Resist 4 Driving IC 5 Output terminal 6 Input terminal

Claims (5)

[Claims] 1. A tape carrier package having terminals on a base film, wherein the terminals are used for connection to an external circuit.
A tape carrier package provided in a row in parallel with a peripheral portion of a base film, wherein the terminals are reinforced by making the widths at both ends wider than the center of the row. 2. The tape carrier package according to claim 1, wherein the width of the terminal is gradually increased from the center of the row to both ends. 3. The terminals from the center to the both ends of the row are grouped, and the width of the grouped terminals is set stepwise wider in group units from the center of the row to both ends. The tape carrier package according to claim 1, wherein the tape carrier package is provided. 4. The terminal according to claim 1, wherein the overall width of the terminal is changed.
A tape carrier package according to the item. 5. The tape carrier package according to claim 1, wherein each of the terminals has a width changed only in a portion requiring reinforcement.