JP2967744B2 - Liquid crystal display device and manufacturing method thereof - Google Patents

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 of manufacturing the same, and more particularly to a liquid crystal display device relating to connection and structure of a terminal portion of a signal line derived from a liquid crystal panel and a terminal portion of an external drive circuit portion. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, a connection between a signal line derived from a liquid crystal panel of this type and an external drive circuit for driving a liquid crystal is required to obtain higher connection reliability and to reduce the size of a liquid crystal display device. Various proposals have been made to do so.

FIGS. 3A and 3B are cross-sectional views for explaining an example of connecting an external drive circuit section in a conventional liquid crystal display device. The connection between the terminal portion of the signal line derived from the liquid crystal panel and the terminal portion of the external drive circuit portion is performed, for example, by connecting the signal line terminal of a transparent substrate 5b extending from the liquid crystal panel 5 as shown in FIG. A silicone-based cushion in which a portion 6 and a terminal portion 8 of an external drive circuit portion are stacked so that respective electrode portions face each other via an anisotropic conductive film 7 and are disposed on the upper surface of the terminal portion 8 of the external drive circuit. A conductive connection is made by heating and pressing the rubber 10 (or a Teflon sheet or the like) with a thermocompression bonding head 11. Thereafter, in order to assemble the liquid crystal panel, a new shock absorbing member (not shown) and a shield frame (not shown) are incorporated between the terminal portion 8 of the external drive circuit and a shock absorbing member (not shown) for the purpose of panel crack prevention. Was out.

However, the cushion rubber 10 used at the time of thermocompression bonding has a drawback that the cushion effect is weakened by several times of thermocompression bonding and the cushion effect is weakened and it must be replaced with a new one. Further, in this connection method, since the signal line between the external drive circuit section terminal 8 and the liquid crystal panel 5 is exposed, there is a problem that corrosion is likely to occur due to the adhesion of an ionic substance containing moisture and the wire is disconnected. is there.

[0005] As a connection method for solving this corrosion problem,
As shown in FIG. 3B, after connecting the external drive circuit section terminal 8 and the signal line terminal section 6 via the anisotropic conductive film 7, the sealing resin material 13 is applied by a dispenser 12 or the like to expose the exposed section. Was covered. However, in this method, after the connection between the terminal portion 8 of the external drive circuit portion and the signal line terminal portion 6, a resin is applied to the exposed signal line portion and the resin is subjected to a hardening treatment. There is a disadvantage that the cost increases due to an increase.

[0006] A connection method for overcoming this drawback is disclosed in Japanese Patent Application Laid-Open No. Hei 6-331999. In this connection method, a signal line terminal portion of a liquid crystal panel and a terminal portion of an external drive circuit portion are crimped via an anisotropic conductive film composed of an uncured photocurable material and conductive particles, Uncured photocurable material containing conductive particles flows out to the part of the liquid crystal panel where the signal lines are exposed, and the light is used to cure the photocurable material between the terminals of the external drive circuit and the signal line terminals. At the same time, a photocurable material that flows to the liquid crystal panel side and covers the signal line is cured.

[0007]

According to the above-described connection method in which the exposed surface of the signal line is covered simultaneously with the connection of the terminal portion, the surface on which the signal line is formed can be covered without increasing the number of steps, but the conductive particles can be covered. However, the use of the photocurable material including the above has a problem that the conductive particles of the photocurable material that have flowed out aggregate and short-circuit between signal lines. In addition, there is no guarantee that the photocurable material that flows out will cover the signal line formation surface reliably, and the photocurable material is likely to be uneven in thickness or deficient, and there is a possibility that an ionic substance may enter from that portion.

Further, although the signal line exposed can be covered simultaneously with the connection between the terminal portion of the external drive circuit section and the signal line terminal, the frame for holding the external drive circuit section of the liquid crystal panel after this connection in any case. It is necessary to incorporate a shock absorbing member between them.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a protective film for covering a surface of a signal line formed between an external drive circuit portion terminal and a signal line terminal portion extending from a liquid crystal panel with a uniform thickness. To provide a liquid crystal display device having a shock absorbing member for preventing panel cracking, and to attach a shock absorbing member for preventing cracking of the liquid crystal panel, connect to an external drive circuit, and form a coating film on a signal line forming surface. An object of the present invention is to provide a manufacturing method that can be performed simultaneously.

[0010]

A feature of the present invention is that a liquid crystal panel in which liquid crystal is filled between two transparent substrates and a surface of one of the transparent substrates extending outward from the liquid crystal panel. A terminal portion of an external drive circuit portion connected to a signal line terminal portion formed through an anisotropic conductive film through an anisotropic conductive film, wherein the signal line extends from the liquid crystal panel and is formed on the transparent substrate. A thermosetting resin film that covers the signal line forming surface connected to the terminal section, and the thermosetting resin film is connected to the thermosetting resin film.
Is the external drive circuit section covering the terminal portions of a heat-resistant impact-absorbing member is adhered to the thermosetting resin film, and a metal film covering the thermosetting resin film covering the forming surface of the signal line It is a formed liquid crystal display device.

Another feature of the present invention is that it comprises a transparent substrate.
The anisotropic to the transparent substrate having a signal line terminal portions on the liquid crystal panel end terminal part of the external drive circuit unit through a different <br/> anisotropic conductive film overlapping, on the signal line terminal portions that through the conductive film covered with a thermosetting resin sheet so that the terminal portion side of the external drive circuit unit to be placed as to cover the forming surface of the signal line, further heat resistance impact on the thermosetting resin sheet An absorbing member is placed, and then the thermosetting resin sheet is heated while being pressurized and thermocompression-bonded, and the heat-resistant shock absorbing member and the driving circuit are pressed.
The thermosetting adhesive film covering the signal line forming surface while overlapping and adhering the terminal portion of the portion and the anisotropic conductive film and the signal line terminal portion; and further forming the signal line forming surface.
Production method der of the liquid crystal display device for forming a metal film covering the thermosetting resin film covering the Ru.

[0012]

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

FIG. 1 is a sectional view showing a liquid crystal display device according to an embodiment of the present invention. As shown in FIG. 1, the liquid crystal display device includes a liquid crystal panel 5 in which liquid crystal is filled between two transparent substrates 5a and 5b, and one of the transparent substrates extending outward from the liquid crystal panel 5. Between the liquid crystal panel 5 and the terminal section 8 of the external drive circuit section, which are connected to the signal line terminal section 6 formed on the surface of 5b via an anisotropic conductive film 7; Line forming surface 4 exposed to
And a resin coating 2 of a thermosetting resin applied so as to cover a region including the terminal portion 8 of the external drive circuit portion, and a resin coating of a thermosetting resin corresponding to the region of the terminal portion 8 of the external drive circuit member Heat-resistant shock-absorbing member 1 applied so as to cover area 2
And

That is, the resin coating 2 is applied to the signal line forming surface 4 which is an area where the signal lines are exposed, thereby preventing the intrusion of the substance contained in the ions. As a result, disconnection of the signal line due to corrosion of the signal line was eliminated, and connection reliability was improved. Furthermore, in order to more reliably prevent the intrusion of the substance contained in the ions, the water-resistant coating 3 such as a metal film such as aluminum foil or a laminated material of a fluororesin having low water absorption and aluminum foil is used. It is desirable to cover the coating 2.

When the frame is assembled, the shock absorbing member 1 inserted between the frame and the terminal portion 8 of the external drive circuit portion is preferably made of a silicone-based cushion rubber. In addition to being able to be used as a pressing member for bonding the anisotropic conductive film 7, it has a function of uniformly tightening the liquid crystal panel by the frame without damaging the panel.

FIGS. 2A and 2B are cross-sectional views for explaining a method of manufacturing the liquid crystal display device of FIG. next,
A method for manufacturing the liquid crystal display device of FIG. 1 will be described with reference to FIG. First, as shown in FIG. 2A, an anisotropic conductive film 7 is mounted on an electrode portion of a signal line on a transparent substrate 5b extending outward from the liquid crystal panel 5. Further, the anisotropic conductive film 7
The terminal portion 8 of the external drive circuit portion is mounted on the device in accordance with the electrode portion of the signal line terminal portion. Then, a resin sheet 2a of a thermosetting resin is laid so as to cover the signal forming surface 4 and the terminal portion 8 of the external drive circuit portion. Next, the shock absorbing member 1 is placed on the resin sheet 2 corresponding to the terminal section 8 of the external drive circuit section, and the water-resistant covering material 3a is placed on the resin sheet 2 corresponding to the signal line exposing section 4. At this time, when the water-resistant coating is not bonded, a Teflon sheet that is hardly bonded to the resin sheet 2 may be placed instead of the water-resistant coating 3a.

Next, as shown in FIG. 2 (b), the shock absorbing member 1 is pressed by the high-pressure thermocompression head 11a to which the pressing force is applied by the large air cylinder of the thermocompression machine, and at the same time, the pressing is performed by the small air cylinder. The resin sheet 2 is pressed by the low-pressure thermocompression head 11b to which pressure is applied via the water-resistant coating material 3a, and is pressed while heating the resin sheet 2 by the heated thermocompression head.
Is melted and hardened, and the signal line terminal portion 6 and the terminal portion 8 of the external drive circuit portion are connected via the anisotropic conductive film 7 and, at the same time, the shock absorbing member 1 is attached and the resin is applied to the signal line exposing portion 4. The coating 2 is formed, and the liquid crystal display device shown in FIG. 1 is obtained.

The pressure bonding of the anisotropic conductive film 7 by the high-pressure thermocompression bonding head 11a is performed by applying a pressure of 30 kg / cm ² and maintaining the temperature at 180 ° C. for several seconds. Thereafter, the resin sheet 2 was pressed until it was melted, crosslinked and cured. Further, in order to melt and harden the resin sheet 2 of the signal line exposing portion 4, the low pressure thermocompression bonding head 11b is used.
To 2 kg / cm ² . On the other hand, the shock absorbing member 1 was made of a silicone rubber having a thickness of 1.0 mm, and the resin sheet 2 was made of a moisture-resistant epoxy adhesive sheet having a thickness of about 0.1 mm. As the water-resistant covering material, a laminated material of 0.005 mm aluminum foil and about 0.1 mm of 3 hooker vinyl was used.

Of course, if the environment in which the liquid crystal display device is placed is stable in temperature and humidity, the water-resistant coating 3 shown in FIG. 1 is not necessary. After placing the Teflon sheet that is difficult to adhere to the resin sheet 2 on the resin sheet and thermocompression bonding, remove the Teflon sheet,
It is only necessary to cover the signal exposing portion 4 with the resin coating 2.

[0020]

As described above, according to the present invention, by forming a coating material having a uniform thickness covering the exposed signal line forming surface, it is possible to prevent the penetration of ionic substances and prevent the signal lines from corroding. There is an effect that reliability is increased without disconnection. Further, by forming a metal film further on the covering material according to the environment in which the liquid crystal display device is used, there is an effect that the liquid crystal display device can be used in any environment.

On the other hand, the connection of the signal line terminal portion via the anisotropic conductive film of the terminal portion of the external drive circuit portion, the installation of the shock absorbing member for preventing the panel from being damaged, and the formation of the covering material are performed by one thermosetting resin. Since the thermocompression bonding of the resin sheet is sufficient, the number of steps can be reduced, and the cushion material used at the time of thermocompression bonding can be left as an impact absorbing member, so that there is an effect that the cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a method for manufacturing the liquid crystal display device of FIG.

FIG. 3 is a cross-sectional view illustrating an example of connecting an external drive circuit unit in a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shock absorbing member 2 Resin coating 2a Resin sheet 3 Water resistant coating 4 Signal line forming surface 5 Liquid crystal panel 5a, 5b Transparent substrate 6 Signal line terminal part 7 Anisotropic conductive film 8 Terminal part of external drive circuit part 10 Cushion rubber 11 Thermocompression head 11a High pressure thermocompression head 11b Low pressure thermocompression head 12 Dispenser 13 Sealing resin material

Claims (2)

(57) [Claims] 1. A liquid crystal panel in which liquid crystal is filled between two transparent substrates, and a signal line terminal portion formed on a surface of one of the transparent substrates extending outward from the liquid crystal panel. In a liquid crystal display device comprising a terminal portion of an external drive circuit portion connected via an isotropic conductive film, a signal line extending from the liquid crystal panel and formed on the transparent substrate and connected to the signal line terminal portion has a surface on which a signal line is formed. A thermosetting resin film for covering, a heat-resistant shock absorbing member connected to the thermosetting resin film and bonded to the thermosetting resin film for covering a terminal portion of the external drive circuit section, and the signal line; A liquid crystal display device, wherein a metal film is formed to cover the thermosetting resin film that covers the formation surface of the liquid crystal display. 2. A superimposing the ends of the terminal portions of the external drive circuit section via the anisotropic conductive film on the transparent substrate having a signal line terminal portions constituted liquid crystal panel of a transparent substrate, the signal line terminal portions the covered with a thermosetting resin sheet so that the terminal portion side of the external drive circuit unit to be placed via the anisotropic conductive film and covering the forming surface of the signal line above, further the thermosetting resin sheet Place the heat resistance impact absorbing member on the <br/> over preparative, whereafter said thermosetting resin sheet was pressed while heating to thermocompression bonding the said heat-resistant impact-absorbing member and the terminal portion of the driver circuit portion The anisotropic conductive film and the signal line terminal portion are overlapped and adhered, the thermosetting adhesive film covering the signal line forming surface is formed, and the thermosetting resin covering the signal line forming surface is further formed.
A method for manufacturing a liquid crystal display device, comprising forming a metal film covering a grease film .