JPH01232326A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To quantitatively and surely decide the connecting state between connecting terminals by adding dummy terminals for inspecting the connecting state to the extension part of the connecting terminal arrangement. CONSTITUTION:The dummy terminals I1, I12 are provided to a liquid crystal element 1 and the dummy terminals -O1, -O2, -O13, -O14 are provided to a flexible substrate 2. The connecting terminals of the liquid crystal element 1 and the connecting terminals of the flexible substrate 2 are connected by an anisotropic connector. The circuit of -O1 connector 4 I1 connector 4 -O2 is, therefore, formed on the left side and the similar circuit is formed on the right side as well. The connecting state is judged to be normal if the resistance values between the -O1 and the -O2 and between the -O13 and the -O14 is <=50OMEGA. The positioning and press welding are executed again when the values are above the specified value. The connecting state is thereby quantitatively decided and the liquid crystal element having the high reliability is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for connecting connection terminals of a drive circuit on a flexible tape substrate mounted with an IC chip for driving a liquid crystal display element and connection terminals of a liquid crystal display element electrode. The present invention relates to a liquid crystal display device in which it is possible to easily and accurately determine the quality of the connection between the anisotropic connectors.

[Prior Art] Liquid crystal display devices consume less power, can be powered by batteries, and are suitable for portable use, so they are becoming increasingly smaller and thinner.

In order to make the product smaller and thinner, and at the same time improve mass production,
An IC chip for driving a liquid crystal display element is mounted on a flexible tape substrate with quick-acting circuit wiring printed on it.
The AB method is advantageous.

In addition, if the connection terminal of the liquid crystal display element of the liquid crystal display device and the connection terminal of the drive circuit are connected using an anisotropic connector as disclosed in Japanese Patent Application Laid-open No. 148398/1980, connection can be made. Although this simplifies the process and improves productivity, there are cases where electrical connections cannot be made reliably due to variations in crimping conditions.

Also, when using the TAB method and anisotropic connector together,
The connection terminal on the liquid crystal display element side is behind the anisotropic connector and tape substrate. A polyimide resin film having a thickness of 75 to 125 μm is generally used as the tape material of the flexible tape substrate from the viewpoint of heat resistance, but the light transmittance of this tape material is not sufficient. In the case of TAB method, I
Since the output of the C chip is directly connected to the rotating electrode of the liquid crystal display element, it is important to check the connection state, but it is necessary to rely on visual inspection. However, in the above-mentioned situation, it was difficult to manage the connection state by visual inspection. [Problems to be solved by the invention] The present invention solves the above-mentioned conventional problems, and improves the connection terminals on the liquid crystal display element side. It is an object of the present invention to provide a liquid crystal display device that can reliably and quantitatively determine whether or not the connection state of an anisotropic connector with a flexible tape substrate side connection terminal is good or bad.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides for each of a liquid crystal display element and a flexible tape substrate.

In addition to the connection terminals necessary for display and discharge, dummy terminals are added to the extensions of these connection terminal arrays for testing the connection status using anisotropic connectors between the connection terminals, and the anisotropic connectors are By inspecting the connection state between the necessary connection terminal and the dummy terminal that is shared, it is possible to estimate whether the connection state between the necessary connection terminals is good or bad.

[Function] The dummy terminals arranged as described above are formed using a sufficiently reliable technique, so that the dummy terminals on the liquid crystal display element side and the flexible tape side are arranged to accurately face each other, and these dummy terminals It is safe to assume that the connection state using an anisotropic connector between the terminals is the same as the connection state using an anisotropic connector between connection terminals necessary for display and immediate movement of elements.

Therefore, when measuring the resistance value between the dummy terminals, if it is smaller than a certain predetermined value, it is assumed that the connection state between the connection terminals necessary for the liquid crystal display device is good, and if it is larger than the predetermined value, the resistance value is It is considered that there is a problem with the connection between the connection terminals necessary for the device, and that one work needs to be reviewed.

[Example] Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a plan view of a connecting terminal portion between the liquid crystal display element side and the flexible tape side of a conventional liquid crystal display device, and Fig. 3 is a plan view of an embodiment of the present invention. FIG. 3 is a side sectional view of a conventional connection terminal connection portion.

In the embodiment of the present invention shown in FIG. 1, the liquid crystal display element 1 includes:
A dummy terminal portion 11□ is provided, and dummy terminals ○□02, ○□3, ○, and □ are provided on the flexible board 2. The connection terminals of the liquid crystal display element and the connection terminals of the flexible substrate are connected by an anisotropic connector 4.

■4, Lx is set to the width of two lines, 01.02 and ○01.014, respectively. By doing this, if the terminal alignment between the liquid crystal display element 1 and the flexible substrate 2 is done correctly, ○□ → anisotropic connector → /■, → anisotropic connector → 02, and ○□3 → anisotropic Sex connector → 1□2
→Different connector →014 circuit is formed. 0 engineering,
If the resistance value between 02 and 0.3.014 is 50Ω or less, the connection status is determined to be normal, and if it exceeds this value,
Either the terminals are misaligned, or there is a problem with the connection of the anisotropic connector, so reposition and re-crimp. When connecting flexible substrates with anisotropic connectors, the connection reliability at both ends of the flexible substrate is poor, so dummy terminals are provided at two locations on the left and right as in this embodiment.

In addition, as shown in Fig. 2, in the conventional device, dummy 1
Child 11. Lx, ○□, 02, O13, (>14) are not provided. Therefore, it is completely impossible to quantitatively estimate the connection state between the connection terminals.

[Effects of the Invention] As explained above, according to the present invention, since the connection state can be determined quantitatively, it is possible to easily establish the correct connection state, and a highly reliable liquid crystal display device can be obtained. It will be done.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a plan view of the connection terminals on the liquid crystal display element side and flexible tape side of a conventional liquid crystal display device, and Fig. 3 is a plan view of the connection of the embodiment and the conventional example. It is a side sectional view of a terminal connection part. 1... Liquid crystal display element, 2... Flexible board, 3 - IC chip, 4... Anisotropic connector, ■
, ~Iia... terminal on the liquid crystal display element side, ○, ~O1
4...Figure 1 Figure 2 Figure c'-2

Claims (1)

[Claims] 1. Liquid crystal display element, IC for driving the liquid crystal display element
In a liquid crystal display device that includes a flexible tape substrate on which a chip is mounted, an anisotropic connector that electrically connects the connecting terminals of these two, and a frame that surrounds each of the above members and fixes their relative positions, a liquid crystal display element and a flexible tape substrate are provided. In addition to the connection terminals necessary for display and driving on each tape board, dummy terminals are added and arranged on the extension of these connection terminal arrays for testing the connection status using anisotropic connectors between the connection terminals. A liquid crystal display device characterized in that it is possible to estimate the quality of the connection between the necessary connection terminals by inspecting the connection state between the dummy terminals that share an anisotropic connector with the necessary connection terminals. .