KR100629043B1 - Liquid Crystal Display and Method for Fabricating LCD which Removing Dust during Rubbing Process - Google Patents

Abstract

The present invention relates to a liquid crystal substrate and a method for manufacturing a liquid crystal substrate to remove foreign substances generated in the rubbing process, the foreign matter generated during the rubbing process during the manufacturing process of the liquid crystal substrate is perpendicular to the rubbing direction on the outside of the screen portion of each pixel cell The present invention relates to a liquid crystal substrate for forming a concave or convex pattern portion in one direction, and to remove foreign substances generated in a rubbing process and a liquid crystal substrate capable of reducing defects caused by foreign substances by causing the generated foreign substances to be caught in the pattern portions.

Therefore, according to the present invention, there is a remarkable effect of lowering the defective rate of the liquid crystal substrate by effectively controlling foreign substances generated in the rubbing process, which is one of the liquid crystal manufacturing processes.

Debris Removal Pattern

Description

Liquid crystal display and method for fabricating LCD which removing dust during rubbing process

1 is a perspective view of a conventional rubbing device for removing foreign matters generated during the rubbing process.

2 is a plan view of a substrate on which a pattern portion is formed to remove foreign matters generated in a rubbing process according to the present invention.

3 is a cross-sectional view of a first embodiment of a substrate on which a convex pattern portion is formed to remove foreign matter according to the present invention.

4 is a cross-sectional view of a second embodiment of a substrate in which a concave pattern portion is formed to remove foreign matter according to the present invention.

** Explanation of symbols for main parts of drawings **

10: substrate 30: foreign material removal pattern

50: screen forming part

The present invention relates to a liquid crystal substrate and a method for manufacturing a liquid crystal substrate to remove foreign substances generated in the rubbing process. In more detail, foreign matters generated during the rubbing process during the manufacturing process of the liquid crystal substrate are screen outer portions of each pixel cell. Forming a concave or convex pattern portion in a direction perpendicular to the rubbing direction, the liquid crystal substrate that can reduce the defects caused by foreign substances by causing the generated foreign matter is caught in the pattern portion and the liquid crystal substrate to remove the foreign substances generated in the rubbing process It is about a method.

A manufacturing method of a conventional liquid crystal substrate will be described. First, the lower substrate will be described. A lower BM (black matrix), a switching element, and a capacitor are stacked on a transparent quartz substrate or a glass substrate, and then an insulating film is deposited on the upper substrate to form a transparent electrode made of indium tin oxide (ITO). Pattern forms. An alignment film treatment for arranging liquid crystals on the upper portion is performed. In this case, a protective film for protecting the transparent electrode may be added between the transparent electrode and the alignment layer. Next, the upper substrate is formed with a transparent electrode facing the pixel electrode formed on the lower substrate on the transparent substrate, the alignment layer is formed on the upper substrate. The upper substrate and the lower substrate on which the alignment layer has been treated are subjected to rubbing using a rubbing roll wound around a cylindrical core to give the alignment layer directivity. At this time, a large amount of dust is generated, and in order to prevent the dust from adhering to the liquid crystal substrate, first, the ionized air is shaken off by using an ion generator during the rubbing process or after the rubbing process.

The conventional manufacturing method of the liquid crystal substrate as described above is installed on the inside of the rubbing device, the rubbing stage and the rubbing roll, respectively, by installing an ion generating device for blowing ionized air and an antistatic bar for blowing air to the static electricity of the liquid crystal substrate. To prevent breakage and remove foreign substances.

1 is a perspective view of a conventional rubbing device for removing foreign matters generated during the rubbing process.

1 is a invention disclosed in Korean Patent Application No. 1995-67064. Referring to this, a rubbing device configured to prevent foreign matter from adhering to the surface of a substrate during a rubbing operation, and its main configuration is a rubbing work table ( A fastener 5 provided to fix the substrate on the upper surface of 1) and an area smaller than the size of the substrate 4 inside the fixture 5 are formed to be opened in the center of the table 1 and blown through it. The openings (not shown) thus configured and the first and second through holes 2 and 3 formed in the outer circumferential side of the substrate 4 fixed to the fastener 5 and configured to blow and suck are provided. The work method for removing foreign matters generated in the rubbing process includes positioning the substrate 4 in the fixture 5, fixing the substrate 4 by blowing at the lower portion of the substrate 4, and a rubbing roller ( 6) and on the surface of the substrate 4 by blowing and sucking by a plurality of first and second through holes 2, 3 formed on the outer periphery of the substrate 4 during the rubbing operation by the rubbing cloth 61; It is a step of removing foreign matters generated in.

As described above, according to the conventional method, the static electricity accompanied by the foreign matter generated during the rubbing process and the friction completely prevents contamination of the substrate by the foreign matter even when the humidity is effectively controlled by increasing the humidity or installing the ion generator. There was a problem that could not be eliminated.

The present invention has been made to solve the problem that the yield is reduced due to defects in the liquid crystal substrate due to the foreign matter generated during the rubbing process, the liquid crystal pattern formed in the form of concave or convex to remove the foreign matter It is an object to provide a substrate.

Still another object of the present invention is to provide a liquid crystal substrate manufacturing method for removing foreign substances generated in the rubbing process.

In order to achieve the above object, the liquid crystal substrate according to the present invention,
A substrate including a plurality of screen forming parts that constitute a plurality of pixels and are spaced apart from each other and provided in a plurality of checkerboard shapes, and a non-screen forming part defined by spaced spaces between the plurality of screen forming parts; A plurality of patterns formed convexly or concavely between the start point and the end point of the side and an alignment film applied on the substrate in the non-screen forming portion of the substrate along at least one side direction of the forming portion; The formation direction is not parallel to the rubbing direction of the alignment film.

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Preferably, the patterns are formed in a direction perpendicular to the rubbing direction, and preferably, the height or depth of the convex or concave pattern is formed to be at least 50 nm or more from the substrate.

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In order to achieve the above another object, the liquid crystal substrate manufacturing method for removing foreign matters generated in the rubbing process according to the present invention comprises a plurality of screen forming parts which constitute a plurality of pixels and are spaced apart from each other and provided in a plurality of checkerboard shapes. And sequentially applying an alignment layer for arranging liquid crystals on a transparent substrate having a non-screen forming portion defined as spaced spaces between the plurality of screen forming portions, and rubbing to give orientation to the alignment layer. A method of manufacturing a substrate, the method comprising: forming a plurality of convex or concave patterns in a non-screen forming portion of the substrate between a start point and an end point of the non-screen forming portion in a direction along at least one side of the screen forming portion; Applying an alignment layer to the substrate on which the pattern is formed; And rubbing the substrate coated with the alignment layer in a direction that is not parallel to the direction in which the pattern is formed.

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Preferred embodiments, advantages and features of the present invention are described in detail below with reference to the accompanying drawings.
2 is a plan view of a liquid crystal substrate on which a pattern portion is formed to remove foreign substances generated in a rubbing process according to the present invention. Arrow B in Fig. 2 indicates the rubbing direction.

Referring to FIG. 2, the screen forming parts 50 are formed on the substrate 10 on which the semiconductor process is completed, aligned in a checkerboard shape for each cell. Then, patterns 30 for removing foreign matters are formed on the non-screen forming portions that do not constitute pixels outside the screen forming portions 50 arranged in a checkerboard shape so as to be perpendicular to the rubbing direction.

In the lower substrate, the screen forming portion 50 refers to a region where the pixel electrode is formed, and the non-screen forming portion refers to a region other than the region where the pixel electrode is formed. The screen forming part 50 in the upper substrate refers to a part that is optically opposed to the area where the pixel electrode of the lower substrate is formed, and the non-screen forming part refers to the remaining area except for the screen forming part 50. If FIG. 2 shows a top view of the lower substrate, the hatched portion 50 is defined as the screen forming portion 50 and the remaining portion is defined as the non-screen forming portion.

Therefore, in the present invention, the substrate 10 is a lower plate formed by laminating thin film transistors, pixel electrodes, etc. in each cell unit by a TFT process, and an upper plate formed with a counter electrode opposite thereto, which is in a state before the process of applying the alignment film. It means a substrate.

 In the present invention, the patterns 30 for removing the foreign matter are not limited to the direction perpendicular to the rubbing direction on the substrate 10, and include all configurations formed in a direction not parallel to the rubbing direction.

Non-screen, in which the patterns 30 for removing the foreign matter on the substrate 10 on which the screen forming portions 50 are formed in each cell unit do not constitute pixels outside the screen forming portions 50 of each cell unit. After being formed in a direction that is not parallel to the rubbing direction in the forming portion, rubbing is applied to give the alignment film a certain directivity, thereby generating static electricity and foreign matter. In the present invention, in order to prevent foreign matters such as dust from adhering to the upper and lower liquid crystal substrates 50, by applying ionized air using an ion generator during the rubbing process or after the rubbing process, the foreign substances generated at the same time The pattern 30 is filtered to reduce the defective rate of the liquid crystal substrate 50.

Since the patterns 30 for removing the foreign matter are formed in the non-screen forming portion that does not constitute a pixel outside the screen forming portion 50 where the color formed in the unit of cells is emitted, the foreign matter is caught between the patterns 30. Even if it does not affect the quality of the image through the liquid crystal substrate at all.

In the present invention, the patterns 30 for removing foreign matter are formed in a convex or concave shape.

3 is a cross-sectional view of a first embodiment of a substrate on which a convex pattern portion is formed to remove foreign matter according to the present invention.

FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 2. Referring to FIG. 3, each screen forming portion 50 is installed on the substrate 10, and the non-screen forming portion is formed between the screen forming portions 50. Convexly patterned foreign material removal patterns 30a are formed. As a method for forming the convex foreign matter removal pattern 30a, the foreign matter removal pattern 30a may be convexly formed by a general semiconductor pattern forming process such as an etching or deposition process using a photoresist and a mask. .

It is preferable that the height of the convex foreign matter removal pattern 30a according to the present invention be at least 50 nm or more from the surface of the substrate 50.

4 is a cross-sectional view of a second embodiment of a substrate in which a concave pattern portion is formed to remove foreign matter according to the present invention.

FIG. 4 is a cross-sectional view of the AA ′ portion of FIG. 2 as shown in FIG. 3. Referring to FIG. 4, respective screen forming portions 50 are installed on the substrate 10, and the ratio between the screen forming portions 50 is different. Concave patterned foreign material removal patterns 30b are formed in the screen forming portion. As a method for forming the concave foreign material removal pattern 30b, a portion where the foreign material removal pattern 30b is to be formed is formed by a general semiconductor manufacturing process such as an etching or deposition process using a photoresist and a mask. It can be formed by etching.

It is preferable that the depth of the concave foreign matter removal pattern 30b according to the present invention be at least 50 nm or more from the surface of the substrate 50.

According to the liquid crystal substrate manufacturing method for removing foreign matters generated in the rubbing process according to the present invention, there is a remarkable effect of effectively controlling the foreign matters generated in the rubbing process which is one of the liquid crystal manufacturing processes to lower the defective rate of the liquid crystal substrate.

There is a limit to remove foreign matters such as dust generated during the rubbing process by providing a separate rubbing device, and 100% of foreign matters such as dust cannot be completely removed. Therefore, rather than the above method, a pattern for removing foreign matter is installed in a free space of a non-screen forming part that does not constitute a pixel outside a portion occupied by a screen forming part such as a pixel on the substrate, and the foreign material is caught in the foreign material removing pattern. It is possible to overcome the limitation of removing foreign matters only by the rubbing device.

In addition, the pattern for removing the foreign matter is provided in the non-screen forming portion that does not constitute a pixel outside each pixel that is the screen forming portion, so that the performance of the liquid crystal display is not affected at all.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

Claims (13)

A substrate including a plurality of screen forming parts that constitute a plurality of pixels and are spaced apart from each other and provided in a plurality of checkerboard shapes, and a non-screen forming part defined by spaced spaces between the plurality of screen forming parts; A plurality of patterns formed convexly between a start point and an end point of the side of the non-screen forming portion of the substrate along at least one side of the screen forming portion; And And an alignment film coated on the substrate, wherein the direction in which the pattern is formed is not parallel to the rubbing direction of the alignment film. A substrate including a plurality of screen forming parts that constitute a plurality of pixels and are spaced apart from each other and provided in a plurality of checkerboard shapes, and a non-screen forming part defined by spaced spaces between the plurality of screen forming parts; A plurality of patterns that are concavely formed between the start point and the end point of the side of the non-screen forming portion of the substrate along at least one side direction of the screen forming portion; And And an alignment film coated on the substrate, wherein the direction in which the pattern is formed is not parallel to the rubbing direction of the alignment film. The method according to claim 1 or 2, And the patterns are formed in a direction perpendicular to the rubbing direction. The method of claim 1, The height of the convexly formed pattern is at least 50nm or more from the substrate. delete The method of claim 2, The concave formed pattern has a depth of at least 50 nm from the substrate. The method of claim 1, The substrate is a lower substrate, the screen forming portion is a liquid crystal substrate, characterized in that the area occupied by the pixel electrode. Liquid crystal on a transparent substrate comprising a plurality of screen forming parts constituting a plurality of pixels and spaced apart from each other and provided in a plurality of checkerboard shapes, and a non-screen forming part defined as spaced spaces between the plurality of screen forming parts. In the method of manufacturing a liquid crystal substrate by applying an alignment film for arranging the sequential order and rubbing to give a direction to the alignment film, Forming a plurality of convex patterns on the non-screen forming portion of the substrate between the start point and the end point of the side along at least one side of the screen forming portion; Applying an alignment layer to the substrate on which the pattern is formed; And And rubbing the substrate coated with the alignment layer in a direction not parallel to the direction in which the pattern is formed. Liquid crystal on a transparent substrate comprising a plurality of screen forming parts constituting a plurality of pixels and spaced apart from each other and provided in a plurality of checkerboard shapes, and a non-screen forming part defined as spaced spaces between the plurality of screen forming parts. In the method of manufacturing a liquid crystal substrate by applying an alignment film for arranging the sequential order and rubbing to give the alignment film directivity, Forming a plurality of concave-shaped patterns on the non-screen forming portion of the substrate between the start point and the end point of the side along at least one side direction of the screen forming portion; Applying an alignment layer to the substrate on which the pattern is formed; And And rubbing the substrate coated with the alignment layer in a direction not parallel to the direction in which the pattern is formed. The method according to claim 8 or 9, Wherein the patterns are formed in a direction perpendicular to the rubbing direction. The method of claim 8, The height of the convexly formed pattern is at least 50nm or more from the substrate. delete The method of claim 9, And the depth of the concave pattern is at least 50 nm from the substrate.

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