JPH06214248A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent an unequal contrast and to improve a display grade by sticking conductive materials to a pair of substrates provided to face each other with a liquid crystal held therebetween before sticking polarizing plates to these substrates. CONSTITUTION:A copper foil tape 8 having conductive particles in an adhesive is stuck to terminals 3a for connecting external circuits exposed from the ends of glass substrates 1a, 1b by a parting treatment prior to the stage for sticking the polarizing plates. This tape is stuck to the region near the end of the glass substrate 1a on the terminals 3a so as not to hinder the connection of a TCP (wiring board) 9 to the terminals 3a. The potentials of all the electrodes of the terminals 3a formed on the glass substrate 1b are, therefore, equaled. As a result, the generation of the static electricity in the production process for the device and the partial accumulation of charges in a liquid crystal panel occurring in contact with materials having the charges are prevented.

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 in which a liquid crystal display driving LSI (Large Scale Integrated Circuit) or the like is mounted on a liquid crystal panel constructed by mounting a liquid crystal between a pair of glass substrates. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art In a manufacturing process of a liquid crystal display device, generally, a transparent electrode, an alignment film and the like are formed on a pair of glass substrates, respectively, and subjected to an alignment treatment, and then a sealing material is printed to form the above-mentioned pair. The glass substrate of (1) is attached so that the surfaces on which the transparent electrodes are formed face each other. Then, after performing terminal processing and a dividing process for forming a liquid crystal injection port, liquid crystal is injected between the bonded glass substrates and sealed.

Next, polarizing plates are respectively attached to the surfaces of the glass substrates, and static electricity is generated in the step of attaching the polarizing plates. This static electricity is accumulated in the liquid crystal panel through the external circuit connection terminal exposed from the opposing glass substrate by the terminal processing in the above-mentioned dividing step, so the accumulated portion becomes uneven in contrast and deteriorates the display quality. It was the cause.

Therefore, conventionally, after the liquid crystal is injected and sealed, as shown in FIG. 7, first, a copper foil or the like is first formed on the entire surface of the external circuit connecting terminal 14 formed on the glass substrate 12. The conductive tape 13 is attached.

Then, as shown in FIG. 8, after the step of attaching the conductive tape 13 (P31), a polarizing plate is attached (P32), and then the conductive tape 13 is peeled off (P32). P33). Then, autoclave treatment (P
34), by applying the moistureproof material (P35),
The liquid crystal panel is completed.

As described above, the external circuit connecting terminal 14 is used.
By sticking the polarizing plate with the conductive tape 13 stuck on the entire surface of the sheet, all electrodes of the external circuit connecting terminals 14 are kept at the same potential even if static electricity is generated when the polarizing plate is stuck. Therefore, the contrast unevenness of the liquid crystal display device is prevented,
The display quality can be prevented from deteriorating.

[0007]

However, in the above conventional manufacturing method, it is possible to make all the electrodes of the external circuit connecting terminal 14 have the same potential when the polarizing plate is attached, but the conductive tape 13 is Since the external circuit connecting terminal 14 is adhered to the entire surface of the glass substrate 12, the TC having the external circuit connecting terminal 14 mounted with a liquid crystal display driving LSI or the like.
Process before connecting P (Tape Carrire Package),
For example, the conductive tape 13 must be peeled off immediately after attaching the polarizing plate.

Therefore, when another object having a charge comes into contact with the external circuit connecting terminal 14 by the time the TCP is completely connected, the charge is partially accumulated in the liquid crystal panel to cause uneven contrast. Therefore, there is a problem that the display quality is deteriorated.

The present invention has been made in view of the above-mentioned conventional problems, and the portion of the charge in the liquid crystal panel caused by the generation of static electricity, contact with an object having a charge, etc. in the manufacturing process of the liquid crystal display device. It is an object of the present invention to provide a method for manufacturing a liquid crystal display device, which can prevent display accumulation and reliably prevent contrast unevenness to improve display quality.

[0010]

In order to solve the above-mentioned problems, a method of manufacturing a liquid crystal display device according to a first aspect of the present invention comprises a pair of substrates, which are opposed to each other with a liquid crystal interposed therebetween, and a polarizing plate is provided on the pair of substrates. In the method for manufacturing a liquid crystal display device, in which a plurality of external circuit connecting terminals formed on the substrate are made to have the same potential by attaching a conductive member to the substrate before attaching, the external circuit connecting is performed. It is characterized in that a conductive member is attached while leaving the connection area of the wiring board in the connection terminal, and the conductive member is peeled off after connecting the wiring board to the external circuit connection terminal.

In order to solve the above-mentioned problems, the method of manufacturing a liquid crystal display device according to the invention of claim 2 provides
In the method for manufacturing a liquid crystal display device described above, in an area on the external circuit connection terminal corresponding to the vicinity of the end portion of the substrate provided facing the substrate on which the external circuit connection terminal is formed,
It is characterized in that the conductive member is attached.

In order to solve the above-mentioned problems, the method of manufacturing a liquid crystal display device according to the invention of claim 3 provides
In the method for manufacturing a liquid crystal display device described above, the conductive member is attached to the side surface of the substrate on which the external circuit connecting terminal is formed so that the conductive member contacts the end side surface of the external circuit connecting terminal. Is characterized by.

[0013]

According to the method of claim 1, the conductive member attached to the external circuit connecting terminal prior to the attachment of the polarizing plate to the glass substrate leaves the connection area of the wiring substrate to be connected later. Thus, for example, as in claim 2, a region near the end of the opposing substrate in the external circuit connecting terminal, or as in claim 3, the end side surface of the external circuit connecting terminal and the conductive member are It is adapted to be attached to the side surface of the substrate so as to be in contact with it. Therefore, when connecting the wiring boards, it is not necessary to peel off the conductive member, and the connection work can be performed with the conductive member attached.

Further, after the wiring board is connected to the external circuit connecting terminals, the conductive member is peeled off, so that the conductive member causes contrast unevenness due to static electricity generated when the polarizing plate is attached. Not only is this prevented, but also in the subsequent wiring board connection step, all electrodes of the external circuit connection terminals can be held at the same potential. As a result, it is possible to prevent contrast unevenness caused by contact between another object having electric charge and the external circuit connection terminal before the connection of the wiring board is completed.

[0015]

【Example】

[Embodiment 1] One embodiment of the present invention is shown in FIGS.
The explanation is based on the following.

In the method of manufacturing the liquid crystal display device according to this embodiment, the case where the liquid crystal driving LSI is connected to the external circuit connecting terminal of the liquid crystal panel by the TAB (Tape Automated Bonding) method will be described as an example. To do. As shown in FIG. 2, the liquid crystal panel 2 includes a pair of glass substrates 1a and 1b on which transparent electrodes 3 and 3 serving as scanning electrodes and signal electrodes and alignment films 4 and 4 are formed so as to face each other. , These substrates 1
A liquid crystal 6 is sandwiched between a and 1b. Further, the liquid crystal panel 2 is provided on the liquid crystal driving LSI 9 described later.
A liquid crystal display device is configured by connecting a plurality of TCPs (wiring boards) 9 each equipped with b.

The manufacturing process of the liquid crystal panel 2 will be described with reference to the flowchart of FIG.

First, I is formed on the pair of glass substrates 1a and 1b.
Transparent electrodes 3 and 3 made of TO (Indium Tin Oxide) or the like are formed (P1), and alignment films 4 and 4 of polyimide, polyvinyl alcohol, or the like are formed thereon (P1).
2). Then, after the orientation treatment is performed (P3), the sealing material 5 is printed on the glass substrate (P4), and the pair of glass substrates 1a and 1b are bonded (P5).

Next, the bonded glass substrates 1a and 1a
After b is divided into a predetermined shape (P6), terminals are formed and a liquid crystal injection port is formed, the liquid crystal 6 is injected between both glass substrates 1a and 1b and sealed. (P
7). Then, on the glass substrates 1a and 1b, the polarizing plate 7
7 is adhered. Since static electricity is generated in the step of adhering the polarizing plates 7 and 7, the glass substrate 1a.
A copper foil tape (conductive member) 8 having conductive particles in an adhesive is attached to the external circuit connecting terminal 3a exposed from the end of 1b (P8).

This copper foil tape 8 is, as shown in FIG. 1, an end portion of the glass substrate 1a on the external circuit connecting terminal 3a so as not to interfere with the connection of the TCP 9 to the external circuit connecting terminal 3a performed later. It is attached to the nearby area. By sticking the copper foil tape 8 on, the potentials of all electrodes of the external circuit connecting terminals 3a formed on the glass substrate 1b become equal.

After that, as shown in FIG. 2, polarizing plates 7 and 7 are attached to the respective surfaces of the glass substrates 1a and 1b opposite to the surface on which the transparent electrodes 3 and 3 are formed. (P9). At this time, in the vicinity of the end portion of the glass substrate 1a of the external circuit connecting terminal 3a formed on the glass substrate 1b,
As described above, since the copper foil tape 8 is adhered and the potentials of all electrodes of the external circuit connecting terminals 3a are equalized, static electricity generated in the adhering step of the polarizing plates 7 and 7 is applied to the liquid crystal panel. It is possible to prevent partial accumulation in the inside.

Next, an autoclave process is performed with the copper foil tape 8 still attached (P10), and then a moistureproof material (not shown) is applied (P11). As a result, the liquid crystal panel 2 in which the liquid crystal 6 is sandwiched between the pair of glass substrates 1a and 1b on which the transparent electrodes 3 and 3 are respectively formed is completed.

Next, the process of manufacturing the liquid crystal display device by connecting the TCP 9 having the LSI 9b mounted thereto by the TAB method to the liquid crystal panel 2 manufactured as described above will be described with reference to the flowchart of FIG. .

First, an anisotropic conductive film 10 (see FIG. 2) in which fine metal powder is dispersed in a resin is attached to the electrode surface of the external circuit connecting terminal 3a of the liquid crystal panel 2,
It is pressed (P12). Then, the external circuit connecting terminal 3a and the terminal 9c of the TCP 9 on which the LSI 9b is mounted are aligned with the anisotropic conductive film 10 interposed therebetween, and provisionally pressure-bonded (P13). TCP9 above
As shown in FIG. 1, the L is formed on the base film 9a.
The SI 9b is mounted and configured, and each terminal (not shown) of the LSI 9b is connected to the wiring pattern formed on the base film 9a.

When the positioning and temporary pressure bonding of the TCP9 are completed, the main pressure bonding is performed (P14), and the external circuit connecting terminal 3a and the TCP9 are connected through the metal fine particles dispersed in the anisotropic conductive film 10. Electrode 9c is completely connected. The connection of the TCP 9 is performed in a state where the copper foil tape 8 is stuck at a position (near the end of the glass substrate 1a) in the external circuit connecting terminal 3a that does not interfere with the connection of the TCP 9.

In the above description, referring to FIGS. 1 and 2, the step of attaching the copper foil tape 8 to the external circuit connecting terminal 3a formed on the glass substrate 1b and connecting the TCP 9 is described. Although described, the external circuit connecting terminals (not shown) formed on the other glass substrate 1a constituting the liquid crystal panel 2 are attached with copper foil tape, T
The processing such as CP connection is performed in the same manner as the glass substrate 1b.

Next, the TC connected to the liquid crystal panel 2
The PWB is aligned with P9 (P15), and the terminals of the TCP9 are soldered to the PWB (P16). Further, the jumpers produced on the scanning electrode side and the signal electrode side are soldered (P1
7).

Thereafter, the copper foil tape 8 attached to the external circuit connecting terminal 3a of the glass substrate 1b is peeled off (P18). Then, an inspection such as an image inspection is performed (P1
9) If there is no defective portion, then the seal glow is applied and dried (P20) to complete the liquid crystal display device. On the other hand, if a defective portion is found in the inspection process, the repair is performed (P21).

The peeling process of the copper foil tape 8 is performed in TC
It is possible to carry out at any stage after the main press bonding process of P9 and before the inspection, but it is preferable to carry out between the jumper soldering and the inspection as in this embodiment.

As described above, in the method of manufacturing the liquid crystal display device of this embodiment, the copper foil tape 8 is attached to the external circuit connection terminal 3a of the liquid crystal panel 2 prior to the step of attaching the polarizing plates 7 and 7.
The copper foil tape 8 is attached to a region near the end of the counter glass substrate 1a in the external circuit connecting terminal 3a so as not to interfere with the connection of the TCP 9 which will be performed later. It is like this.

Therefore, it is possible to connect the TCP 9 to the external circuit connecting terminal 3a with the copper foil tape 8 attached, and not only when the polarizing plate 7 is attached, but also when the polarizing plate 7 is attached.
Even when CP9 and PWB are connected, it is possible to prevent partial charge accumulation in the liquid crystal panel due to generated static electricity, contact with a charged object, etc. It becomes possible to maintain the same potential. This makes it possible to prevent uneven contrast in the completed liquid crystal display device and improve the display quality.

[Embodiment 2] Next, another embodiment of the present invention will be described with reference to FIGS. 5 and 6. For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In the method of manufacturing a liquid crystal display device according to this embodiment, a liquid crystal panel is manufactured through the same steps as those in the first embodiment, and a liquid crystal display device is completed by connecting TCP or the like to this liquid crystal panel. However, the positions of the copper foil tapes 8 and 8 adhered to the glass substrates 1a and 1b constituting the liquid crystal panel 2 are
This is different from the method of the first embodiment.

That is, as shown in FIGS. 5 and 6, prior to the step of attaching the polarizing plate, the side surfaces of the glass substrates 1a and 1b are brought into contact with the end side surfaces of the external circuit connecting terminals 3a. The copper foil tapes 8 and 8 are attached respectively. As a result, the end portions of the external circuit connecting terminals 3a come into contact with the upper end portions of the copper foil tapes 8 and 8, so that static electricity is generated or electric charges are generated in the manufacturing process of the liquid crystal display device. Even when the object of (1) touches the external circuit connecting terminal 3a, all the electrodes can be held at the same potential.

The copper foil tapes 8 and 8 are the substrates 1a and 1b.
Since it is affixed to the side surface of, the copper foil tapes 8 and 8 are not affixed to the area where TCP9 is connected later,
It is not necessary to peel off the copper foil tapes 8 and 8 before performing the CP9 connecting step. Therefore, the TCP 9 or the like can be connected while the copper foil tapes 8 are still attached.

Then, as in the first embodiment, TCP
By peeling off the copper foil tapes 8 and 8 after connecting 9, PWB, etc., electric charges are partially accumulated in the liquid crystal panel not only when the polarizing plate is attached but also when TCP 9 is connected. To prevent uneven contrast,
It is possible to improve the display quality.

[0037]

As described above, the method for manufacturing a liquid crystal display device according to the first aspect of the present invention attaches a conductive member while leaving the connection area of the wiring board in the external circuit connection terminal,
The conductive member is peeled off after the wiring board is connected to the external circuit connecting terminal.

As described above, the method of manufacturing the liquid crystal display device according to the second aspect of the invention corresponds to the vicinity of the end portion of the substrate provided opposite to the substrate on which the external circuit connecting terminal is formed. The conductive member is attached to a region on the external circuit connecting terminal.

In the method for manufacturing a liquid crystal display device according to the third aspect of the present invention, the external circuit connecting terminal is formed so that the conductive member contacts the end side surface of the external circuit connecting terminal as described above. The conductive member is attached to the side surface of the substrate.

Therefore, not only when the polarizing plate is attached, but also when the wiring board is connected, all electrodes of the external circuit connection terminals can be made to have the same potential by the attached conductive member, so that the liquid crystal It is possible to prevent uneven contrast in the display device and improve display quality.

[Brief description of drawings]

FIG. 1 is a plan view showing a liquid crystal panel in which a copper foil tape is attached to a terminal for external circuit connection on a glass substrate and a TCP is further connected in a method for manufacturing a liquid crystal display device according to an embodiment of the present invention. Is.

FIG. 2 is a cross-sectional view of the liquid crystal panel shown in FIG.

FIG. 3 is a flowchart showing a manufacturing process of the liquid crystal panel.

FIG. 4 is a flowchart showing a process of manufacturing a liquid crystal display device by connecting TCP or the like to the liquid crystal panel.

FIG. 5 is a perspective view showing a liquid crystal panel in which a copper foil tape is attached to a terminal for external circuit connection on a glass substrate and a TCP is further connected in a method for manufacturing a liquid crystal display device according to another embodiment of the present invention. It is a figure.

6 is an enlarged view of a main part of the liquid crystal panel shown in FIG.

FIG. 7 is a plan view showing a liquid crystal panel in which a copper foil tape is attached to external circuit connection terminals on a glass substrate in a conventional liquid crystal panel manufacturing method.

FIG. 8 is a flowchart showing a step of attaching a conductive tape and a polarizing plate onto a glass substrate in a conventional liquid crystal panel manufacturing method.

[Explanation of symbols]

 1a-1b Glass substrate (substrate) 3a External circuit connection terminal 6 Liquid crystal 7 Polarizing plate 8 Copper foil tape (conductive member) 9 TCP (wiring substrate)

Claims (3)

[Claims] 1. A plurality of substrates formed on the substrates by attaching a conductive member to the substrates before attaching the polarizing plates to the pair of substrates provided opposite to each other with the liquid crystal sandwiched therebetween. In a method of manufacturing a liquid crystal display device in which terminals for external circuit connection have the same potential, a conductive member is attached, leaving a connection area of the wiring board in the terminal for external circuit connection, and a wiring board to the terminal for external circuit connection. A method for manufacturing a liquid crystal display device, characterized in that the conductive member is peeled off after the connection. 2. The conductive member is attached to a region on the external circuit connecting terminal corresponding to the vicinity of an end portion of the substrate provided facing the substrate on which the external circuit connecting terminal is formed. The method for manufacturing a liquid crystal display device according to claim 1, wherein the liquid crystal display device is manufactured. 3. The conductive member is attached to the side surface of the substrate on which the external circuit connecting terminal is formed so that the conductive member comes into contact with the end side surface of the external circuit connecting terminal. Item 2. A method for manufacturing a liquid crystal display device according to item 1.