JPH09311336A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device and its manufacturing method with which stripe-like irregularity generated, when a rubbing material passes on an input electrode and reaches an oriented film-coated part, resulting from that a minute quantity of metallic film are transferred on the oriented film-coated part via the rubbing material is removed and the display quality is improved. SOLUTION: This liquid crystal display device 10 is constituted of the oriented film-coated part 9 disposed on a driving substrate 3, the input electrode 4 formed in a region other than the oriented film-coated part 9, and a dummy electrode 100. Then, this liquid crystal display device 10 is turned to a rubbing process and is rubbed in a fixed direction with a roller 8 to which the rubbing material 7 is wound and secured. This liquid crystal display device 10 is formed of the dummy electrode 100, thus a minute quantity of metallic film via the rubbing material 7 are uniformly transferred over the entire oriented film-coated part 9, and the stripe-like irregularity does not appear even after assembly is executed as the liquid crystal display device.

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, a dummy electrode is formed on an input electrode portion on a substrate to suppress the generation of metal film dust in the rubbing process. The present invention relates to a liquid crystal display device having a stable quality and a manufacturing method thereof.

[0002]

2. Description of the Related Art A liquid crystal display device is characterized by a flat structure and low power consumption, and electronic equipment with a liquid crystal display device represented by a liquid crystal projector and a video camera with a liquid crystal monitor,
It is being put to practical use in televisions and is becoming widespread. FIG. 2 is a diagram showing a basic configuration of the liquid crystal display device according to the present invention.
The liquid crystal display device 1 in the figure is generally composed of a counter substrate 2 and a drive substrate 3.

Although not shown, the counter substrate 2 is provided with R, G and B color filters, a transparent electrode 2A and an alignment film 2B in the case of a color liquid crystal panel.
Scanning lines and signal lines insulated from each other are formed on the drive substrate 3, thin film transistors (not shown) for driving each pixel are formed at the intersections thereof, and the transparent electrodes 3A and the alignment film 3B are formed. The input electrode 4 for supplying a drive signal and power to the transparent electrode 3A is formed of ITO (Indium-Thin Oxide) or the like made of the same material as the transparent electrode 3A. A liquid crystal display device having such a structure is called an active matrix type. The liquid crystal display device which is the object of the present invention is not limited to this structure and is merely an example.

The counter substrate 2 and the drive substrate 3 are manufactured in their respective manufacturing processes, and then are arranged to face each other with a predetermined gap therebetween, and a spacer (not shown) is provided.
Are sandwiched and joined by the seal material 5. After that, the liquid crystal 6 is injected from an injection hole (not shown), and two polarizing plates (not shown) are integrally laminated on both surfaces of these glass substrates to complete the liquid crystal display device 1 having the above configuration.

Next, a rubbing method for a conventional liquid crystal display device will be described by exemplifying a rubbing process in the liquid crystal display device in FIG. The rubbing step is a step of rubbing the surfaces of the alignment films 2B and 3B in a certain direction to facilitate the alignment of the liquid crystal molecules in the rubbing direction in order to enhance the orientation of the liquid crystal 6.

In this rubbing process, a substrate to be processed is carried in by a conveyor, and the substrate is rotated by a roller 8 around which a rubbing material 7 such as felt is wound in a roller rotating direction C shown in FIG. Meanwhile, the movement is performed in the roller traveling direction D. The drive substrate that has completed the rubbing process is again delivered by the conveyor and carried out to the next process.

By the way, the alignment film coating portion 9 of the liquid crystal display device 1 is not formed on the input electrode 4 because it is formed in the display region where the pixel portion exists, as shown in FIG. Therefore, by performing such a rubbing process, when the rubbing material 7 passes over the input electrode 4 and moves to the alignment film coating section 9 during the rubbing process, the input electrode 4 is scraped by the rubbing material 7 and is rubbed. A small amount of metal film is transferred onto the orientation coating section 9 through the material 7.

Since this transfer occurs in the portion where the input electrode 4 is formed, when assembled as a liquid crystal display device, only that portion becomes streaky unevenness E as shown in FIG.
There is a problem in that the image quality of the liquid crystal display device becomes defective. This causes a problem that the production efficiency of the liquid crystal display device is significantly lowered and the manufacturing cost of the liquid crystal display device is increased.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a rubbing material when a rubbing material passes over an input electrode and reaches an alignment film coating portion during the rubbing process. It is an object of the present invention to provide a liquid crystal display device and a manufacturing method thereof, in which a display quality is stabilized by eliminating streaky unevenness or the like generated by transferring a trace amount of a metal film onto an alignment coating portion through a material.

[0010]

In order to solve the above-mentioned problems of the present invention, the following means have been taken. That is, in the liquid crystal display device including the alignment film coating portion formed on the substrate of the present invention and the input electrode portion arranged in a region other than the alignment film coating portion, the input electrode portion includes the input electrode portion. The input electrode has a predetermined insulation width, and has the same film quality and film thickness as the input electrode, and is also provided with a dummy electrode over the width where the alignment film coating part is formed. It is characterized by having done.

In the method for manufacturing a liquid crystal display device including the alignment film coating portion formed on the substrate of the present invention and the input electrode portion arranged in a region other than the alignment film coating portion, the input electrode portion is The input electrode that forms the input electrode section has a predetermined insulation width, and the dummy electrode is provided along with the same film quality and film thickness as the input electrode and over the width where the alignment film coating section is formed. By doing so, the transfer of a trace amount of the metal film due to the scraping of the input electrode forming the input electrode part is uniformly distributed in the alignment film coating part, and the occurrence of streak-like unevenness in the rubbing process of the liquid crystal display device Try to avoid it.

According to the liquid crystal display device and the method of manufacturing the same of the present invention, the input electrode portion arranged in the region other than the alignment film coating portion has the same film quality and film thickness as the input electrode forming the input electrode portion, And since the dummy electrodes are arranged side by side over the range in which the alignment film coating portion is formed or more,
When rubbing the liquid crystal display device, the transfer of a trace amount of the metal film to the alignment film coating portion caused by the scraping of the input electrode by the rubbing material becomes evenly distributed. Accordingly, it is possible to avoid the occurrence of streaky unevenness in the rubbing process of the liquid crystal display device and improve the display quality of the liquid crystal display device after assembly.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

The liquid crystal display device of the present invention will be described in detail with reference to FIG. FIG. 1 is a top view showing a liquid crystal display device and a rubbing process of the present invention. It should be noted that parts common to those described in the related art are designated by the same reference numerals.

The liquid crystal display device 10 of the present invention comprises a drive substrate 3
Of the alignment film coating portion 9 disposed in the display area, the input electrode 4 formed of an ITO film or the like in the area other than the display area, and the feature of the present invention is that the dummy electrode 100 includes the alignment film coating portion 9. It is formed over the area to be covered. That is, the dummy electrode 100 is formed between the input electrodes 4 by an ITO film having the insulation width F = 20 μm and having a film thickness of about 140 nm and made of the same material as the input electrode 4 between the electrodes.

The liquid crystal display device 10 of the present invention thus constructed
Are transferred to the rubbing process. In the rubbing process, the roller 8 wound with the rubbing material 7 rotates in the roller rotation direction C and travels in the roller advancing direction D as described above, and the roller 8 causes the surface of the liquid crystal display device 10 of the present invention to move in a predetermined direction. Rub to.

At this time, in the liquid crystal display device 10 of the present invention, since the dummy electrode 100 is formed of the same material in the vicinity of the input electrode 4, the rubbing material 7 is uniformly applied to the input electrode 4 and the dummy electrode 100. It is possible to reduce uneven contact of the input electrode 4 and uneven wear of the rubbing material 7. At the same time, a trace amount of the metal film that has passed through the rubbing material 7 is evenly transferred to the entire area of the alignment film coating portion 9, and no streak-like unevenness appears even after assembly as a liquid crystal display device.

The present invention is not limited to the above embodiment,
Various embodiments can be adopted. For example, the rubbing method for taking a single liquid crystal display device has been described as an example in the above embodiment, but it is needless to say that the present invention can also be applied to a rubbing method for a liquid crystal display device in an assembled state and a rubbing method in an oblique direction. Further, although the present invention exemplifies the embodiment with respect to the driving substrate, it can be applied to any substrate to which a rubbing process is applied. Further, it goes without saying that the present invention is not limited to the above-described embodiment, but can be developed in various forms.

[0019]

As described above, according to the liquid crystal display device and the method of manufacturing the same of the present invention, since the dummy electrode is formed in the vicinity of the input electrode, it is possible to perform the operation other than the alignment film application portion on the substrate in the rubbing process. It is possible to reduce streaky unevenness due to the effect of abrasion of the partially exposed metal film, and improve the display quality of the liquid crystal display device. This has the effect of increasing the process margin in the rubbing process and improving the production efficiency of the liquid crystal display device.

[Brief description of drawings]

FIG. 1 is a top view showing a liquid crystal display device and a rubbing process of the present invention.

FIG. 2 is a schematic cross-sectional view showing a basic configuration of a liquid crystal display device according to the present invention.

3A and 3B are diagrams showing a rubbing process in a conventional liquid crystal display device, FIG. 3A is a top view of the rubbing process, and FIG.
[Fig. 4] is a side view of a rubbing process.

FIG. 4 is a plan view illustrating a problem in a rubbing process in a conventional liquid crystal display device.

[Explanation of symbols]

1 ... Liquid crystal display device, 2 ... Counter substrate, 3 ... Drive substrate, 4 ...
Input electrode, 5 ... Sealing material, 6 ... Liquid crystal, 7 ... Rubbing material, 8 ... Roller, 9 ... Alignment film coating section, 10 ... Liquid crystal display device of the present invention, 100 ... Dummy electrode

Claims (2)

[Claims] 1. A liquid crystal display device, comprising: an alignment film coating section formed on a substrate; and an input electrode section arranged in a region other than the alignment film coating section, wherein the input electrode section has the input The input electrode of the electrode part has a predetermined insulation width, the same kind of film quality and film thickness as the input electrode, and dummy electrodes are provided side by side over a range not less than the formation width of the alignment film coating part. Liquid crystal display device characterized by. 2. A method for manufacturing a liquid crystal display device, comprising: an alignment film coating section formed on a substrate; and an input electrode section arranged in a region other than the alignment film coating section, wherein the input electrode section comprises: The input electrode that constitutes the input electrode portion has a predetermined insulation width, and has the same film quality and film thickness as the input electrode, and a dummy electrode is provided along with the width of the alignment film coating portion or more. By doing so, the transfer of the metal film due to the scraping of the input electrode is evenly distributed in the alignment film coating portion, thereby avoiding the occurrence of unevenness in the rubbing process. .