JPH06110075A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PURPOSE:To prevent a cross material from being peeled off even when applied with an external force. CONSTITUTION:An upper substrate 6 made of resin is stuck on the top surface of a lower substrate 3 made of resin across a seal material 7. An external connection terminal 9 for the upper substrate which is provided on the top surface of one end part of the lower substrate 3 positioned outside the seal material 7 and a connection terminal 10 for repeating which is provided on the reverse surface of one end part of the upper substrate 6 positioned outside the seal material 7 are connected through the cross material 11. The top surface of one end part of the lower substrate 3 positioned outside the cross material 11 and the reverse surface of one end part of the upper substrate 6 positioned outside the cross material 11 are fixed by thermocompression bonding using a thermocompression bonding head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional liquid crystal display device has, for example, a structure shown in FIG. In this liquid crystal display device,
A resin lower substrate 3 having a lower transparent electrode 1 and a lower alignment film 2 provided on the upper surface thereof, and a resin upper substrate 6 having an upper transparent electrode 4 and an upper alignment film 5 provided on the lower surface thereof. The structure is such that the liquid crystal 8 is sealed between the substrates with the sealing material 7 interposed therebetween. Further, in this liquid crystal display device, one end of the lower substrate 3 located outside the sealing material 7 is projected from one end of the upper substrate 6 located outside the sealing material 7, and is located outside the sealing material 7. The external connection terminals are provided only on the upper surface of one end of the lower substrate 3. That is,
An external connection terminal for the lower substrate (not shown) connected to the lower transparent electrode 1 is directly connected to the upper surface of one end portion of the lower substrate 3 located outside the sealing material 7 anywhere. And an external connection terminal 9 for the upper substrate, which is not provided. on the other hand,
A relay connection terminal 10 connected to the upper transparent electrode 4 is provided on the lower surface of one end of the upper substrate 6 located outside the sealing material 7. The upper board external connection terminal 9 and the relay connection terminal 10 are connected to each other through a cylindrical cross member 11 made of silver paste or the like, which is provided in advance on the upper surface of the upper board external connection terminal 9 by printing. ing.

[0003]

However, in such a conventional liquid crystal display device, the resin substrates 3 and 6 have flexibility unlike the hard substrates made of glass or the like, and the sealing material 7 is used. Since the cloth material 11 is arranged on the outside, when an external force is applied to one end portion of the lower substrate 3 at the time of mounting or the like and the one end portion is curved, for example, as shown in FIG. There is a problem that the upper end may be peeled off from the relay connection terminal 10 and a connection failure may occur. In particular, when the width of the external connection terminal 9 for the upper substrate is reduced, the contact area of the cross material 11 is reduced accordingly, which causes a problem that a connection failure easily occurs due to peeling of the upper end portion of the cross material 11. It was An object of the present invention is to provide a liquid crystal display device capable of preventing the cloth material from peeling off even if an external force is applied, and a method for manufacturing the same.

[0004]

A liquid crystal display device according to claim 1, wherein an upper surface of one end of a lower substrate located outside the cloth material and a lower surface of one end of an upper board located outside the cloth material are fixed to each other. It was done. The method of manufacturing a liquid crystal display device according to claim 2, wherein the upper surface of one end of the lower substrate located outside the cloth material and the lower surface of one end of the upper board located outside the cloth material are heated by a thermocompression head. It is designed to be crimped.

[0005]

According to the present invention, the upper surface of one end of the lower substrate located outside the cross member and the lower surface of one end of the upper substrate located outside the cross member are fixed to each other. Can also prevent the cloth material from coming off.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the essential parts of a liquid crystal display device according to an embodiment of the present invention. In this figure, FIG.
The same parts as those of the above are given the same reference numerals, and the description thereof will be appropriately omitted. In this liquid crystal display device, the upper surface of one end of the lower substrate 3 located outside the cross member 11 and the lower surface of one end of the upper substrate 6 located outside the cross member 11 are fixed.
Therefore, in this liquid crystal display device, the cloth material 11 can be prevented from peeling off even when an external force is applied to one end portion of the lower substrate 3.

Next, a case of manufacturing this liquid crystal display device will be described. First, as shown in FIG. 2 and FIG.
On the upper surface of the lower substrate 3, the lower transparent electrode 1, the lower alignment film 2, the lower substrate external connection terminals 21 and the upper substrate external connection terminals 9 are provided on the upper surface, and on the lower surface, the upper transparent electrode 4 and the upper transparent electrode 4, respectively. A liquid crystal cell (the liquid crystal 8 is not injected) is prepared by pasting the upper substrate 6 provided with the alignment film 5 and the relay connection terminal 10 with the sealing material 7 and the cross material 11, and thermocompression-bonding this. It is set between the upper thermocompression bonding head 22 and the lower thermocompression bonding head 23 of the device. In this example, as shown in FIG. 2, two upper board external connection terminals 9 are provided at both ends of the upper surface of one end of the lower board 3 located outside the seal material 7, and each of the upper board external connection terminals 9 is provided. Cloth material 11 on top
Is provided.

Next, as shown in FIGS. 4 to 6, the upper thermocompression bonding head 22 is lowered and the lower thermocompression bonding head 2 is moved.
When 3 is raised to perform thermocompression bonding, one end portions of both substrates 3 and 6 are appropriately curved and pressed against each other, and the pressed contact portions are melted. Thereafter, when the upper thermocompression bonding head 22 is raised and the lower thermocompression bonding head 23 is lowered, the once melted portion is solidified, so that both substrates 3,
The respective one ends of the substrate 6 are fixed to each other. The heating temperature during thermocompression bonding is about 250 to 300 ° C. when the substrate material is PES (polyether sulfone), and P
2 if ET (polyethylene terephthalate)
The temperature is set to about 00 to 250 ° C. Further, at the time of thermocompression bonding, a silicon sheet is interposed between the thermocompression bonding head and the substrate to prevent the thermocompression bonding head and the substrate from sticking to each other. After that, the liquid crystal 8 is injected through a liquid crystal injection port (not shown) formed in the sealing material 7, and then the liquid crystal injection port is sealed, whereby the liquid crystal display device shown in FIG. 1 is manufactured. The liquid crystal 8 may be injected before the thermocompression bonding.

Here, in the state of being thermocompression-bonded, FIGS.
As shown in FIG. 2, the two boards 3 and 6 located between the adjacent external connection terminals 9 and 21 are fixed to each other, and the lower board external connection terminal 21 is brought into contact with the lower surface of one end of the upper board 6, The upper board external connection terminal 9 and the relay connection terminal 10 are in contact with each other.

[0010]

As described above, according to the present invention, the upper surface of one end of the lower substrate located outside the cross member and the lower surface of one end of the upper substrate located outside the cross member are fixed to each other. Since it is possible to prevent the cloth material from peeling off even if an external force is applied, the reliability of the connection is improved.

[Brief description of drawings]

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

FIG. 2 is a plan view of a part of the liquid crystal display device before thermocompression bonding in manufacturing the same liquid crystal display device.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view taken along line BB of FIG. 2 in a state of being thermocompression-bonded when manufacturing the liquid crystal display device.

FIG. 5 is a sectional view taken along line AA of FIG. 2 in the same thermocompression bonded state.

FIG. 6 is a sectional view taken along line C-C of FIG. 2 in the same thermocompression-bonded state.

FIG. 7 is a partial cross-sectional view of a conventional liquid crystal display device.

FIG. 8 is a cross-sectional view shown for explaining problems of the conventional liquid crystal display device.

[Explanation of symbols]

 3 Lower board 6 Upper board 7 Seal material 9 Upper board external connection terminal 10 Relay connection terminal 11 Cross material

Claims (2)

[Claims] 1. An upper substrate provided on a resin lower substrate and a resin upper substrate bonded to each other via a sealing material, the upper substrate being provided on an upper surface of one end of the lower substrate located outside the sealing material. A liquid crystal display device in which an external connection terminal and a relay connection terminal provided on the lower surface of one end of the upper substrate located outside the sealing material are connected via a cross material, wherein the liquid crystal display device is located outside the cross material. A liquid crystal display device, wherein an upper surface of one end of the lower substrate and a lower surface of one end of the upper substrate located outside the cloth material are fixed to each other. 2. An upper substrate provided on a lower substrate made of a resin, the upper substrate made of a resin being bonded to the lower substrate made of a resin via a sealing material, the upper substrate being provided on an upper surface of one end of the lower substrate located outside the sealing material. In a method of manufacturing a liquid crystal display device in which an external connection terminal and a relay connection terminal provided on the lower surface of one end of the upper substrate located outside the sealing material are connected via a cross material, A method for manufacturing a liquid crystal display device, wherein the upper surface of one end of the lower substrate located and the lower surface of one end of the upper substrate located outside the cross member are thermocompression bonded by using a thermocompression head.