JPH02115824A - liquid crystal display device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to connection terminals of conductor patterns formed on a tape carrier and a liquid crystal display of a liquid crystal display element in which a driving LSI is mounted on a tape carrier. The present invention relates to an apparatus that allows alignment work to be always accurately and easily performed in a connection work process with connection terminals on an element substrate.

[Prior Art] In a liquid crystal display device, a driving LSI is first mounted on a conductive pattern for connection wiring formed on a tape carrier using the TAB method, and the connecting terminals of the conductive pattern on the tape carrier are connected to the connecting terminals of the liquid crystal display element. Many of them are connected to wiring connection terminals on the board (Magazine "Electronic Materials J 1987
(April issue, p. 40, etc.), the pitch between these connection terminals is sometimes about 0.15 mm, and it is important to accurately align both connection terminals during connection work.

For this purpose, conventionally, the liquid crystal display element is fixed at a predetermined position on a positioning jig, and a positioning hole previously drilled at a specific position of the tape carrier on which the LSI is mounted is inserted into the positioning jig. Positioning was done by fitting pins implanted at specific positions on the jig. However, in this method, the relative positional relationship between the position of the hole drilled in the tape carrier and (the connection terminal of) the conductor pattern on the tape carrier is difficult to determine.

It is not directly determined, and even if there is a deviation in the hole position for some reason, it is often unknown. That is, it is difficult to maintain high relative position accuracy between the two at all times.

[Problems to be Solved by the Invention] The conventional alignment techniques described above do not give sufficient consideration to accuracy, and there is a risk that a slight error may occur in the relative position between the conductor pattern on the tape carrier and the hole drilled in the tape carrier. In that case, a positional shift occurs between the connection terminal of the tape carrier side conductor pattern and the wiring connection terminal of the liquid crystal display element side.

The present invention provides a liquid crystal display device in which a driving LSI is attached to a conductive pattern on a tape carrier using the TAB method.
It is an object of the present invention to provide a liquid crystal display device that can improve the positioning accuracy of the connection terminals of the conductor pattern on the tape carrier and the connection terminals on the liquid crystal display element substrate during the connection work between the connection terminals of the conductor pattern and the connection terminals of the liquid crystal display element substrate. purpose.

[Means for Solving the Problem] In order to achieve the above object, the present invention provides a driving L
In a liquid crystal display device in which an SI chip is mounted using the TAB method, a positioning means is formed on the tape carrier in addition to forming a conductor pattern for connection wiring on the tape carrier to connect the conductor pattern on the tape carrier. I decided to use it for positioning for connection work between the terminal and the wiring connection terminal on the liquid crystal display element board. Specifically, for example, as a positioning means, a hole made of the same material as the connection wiring conductor pattern is placed on the tape carrier, covering the vicinity of a hole pre-drilled in the tape carrier, and having an inner diameter smaller than that of the hole. It is sufficient to form a conductor pattern having small holes that fit into pins implanted in the connection terminal positioning jig.

[Function] By taking the above-mentioned measures, the alignment means formed on the tape carrier can be formed in the same process using the same mask during the photolithographic formation of the conductor pattern on the tape carrier. Because it can be formed with the connection terminal in the conductor pattern.

The relative position to the alignment means is determined much more accurately than previously. Therefore, alignment of the connection terminals of the conductor pattern on the TAB type tape carrier and the connection terminals on the liquid crystal display element substrate can be performed more easily and accurately than before.

Both yield and throughput are improved.

[Embodiment] Fig. 1 is a top view of a tape carrier equipped with a driving LSI, which is a main part of an embodiment of the present invention, and in the figure, 1 is a driving LSI.
SI, 2 is a tape carrier, 2a is a conductor pattern (a conductor film thereof) on the tape carrier, 3 is a connection terminal, and 4a is a positioning hole according to the present invention provided in the conductor pattern on the tape carrier.

A cross-sectional view of the vicinity of this alignment hole 4a is shown in FIG. 2. As mentioned above, the conductor pattern 2a on the tape carrier
The relative positions of the connection terminal 3 and the positioning hole 4a according to the present invention, which are formed by photolithography in the same process and with the same mask, are kept extremely accurately. Therefore, when the connection terminals on the tape carrier 2 and the connection terminals on the liquid crystal display element substrate are aligned using one alignment jig, the positions always match more accurately than in the past.

In addition, in FIG. 2, 4 is a hole that is pre-drilled in the tape carrier 2, and the diameter of this hole 4 is determined according to the present invention, which is formed in the conductor pattern, taking into account the inaccuracy of the hole position. It is sufficiently larger than the hole diameter of the positioning hole 4a.

Conventionally, as shown in FIG. 3, a hole 4 formed in the tape carrier 2 was used for positioning the side 1 of the tape carrier 2. However, the process of drilling the holes 4 in the tape carrier (generally by mechanical means) and the process of forming the connection terminals 3 on the conductor pattern on the tape carrier (photolithographic method) are different, and in accordance with the present invention, Compared to the above, the relative positional accuracy between the two is inferior, and it is difficult to always maintain the relative positional accuracy accurately.

[Effects of the Invention] As explained above, according to the present invention, the relative positional accuracy between the connection terminal of the connection wiring conductor pattern on the tape carrier and the positioning means according to the present invention is always maintained extremely accurately. Positioning work becomes easier and yield increases.

[Brief explanation of the drawing]

FIG. 1 is a top view of a tape carrier equipped with a driving LSI, which is a main part of an embodiment of the present invention, FIG. 2 is a sectional view of the vicinity of the positioning hole according to the present invention, and FIG. 3 is a conventional FIG. 3 is a cross-sectional view of the vicinity of the positioning hole of the tape carrier. 1... Drive LSI, 2... Tape carrier,
2a... Conductor pattern on tape carrier, 3...
- Connection terminal, 4... Hole drilled in advance in the tape carrier, 4a... Hole for positioning the conductor pattern on the tape carrier according to the present invention.

Claims (1)

[Claims] 1. In a liquid crystal display device in which a driving LSI chip is mounted using the TAB method, positioning means is formed on the tape carrier in addition to forming a conductor pattern for connection wiring on the tape carrier. A liquid crystal display device, characterized in that it is used for positioning for connection work between connection terminals of a conductor pattern on a tape carrier and wiring connection terminals on a liquid crystal display element substrate. 2. In the liquid crystal display device according to claim 1, the positioning means is made of the same material as the conductor pattern for connection wiring, covers the vicinity of a hole previously drilled in the tape carrier, and has an inner diameter larger than that of the hole. A liquid crystal display device in which a conductor pattern is formed with small holes that fit into pins implanted in a jig for positioning connection terminals.