KR101010381B1 - Grinder wheel for liquid crystal display device and grinding method using the same - Google Patents

Abstract

The polishing wheel for the liquid crystal display device and the polishing method using the same of the present invention improve the polishing characteristics and the life of the polishing wheel and shorten the polishing time by forming a double polishing surface on the grinder wheel used for the substrate polishing process. To make, the cylindrical body; A second polishing surface formed on the upper edge of the body and composed of abrasive stone having a large roughness for roughing the protruding end of the glass substrate of the liquid crystal display panel primarily; And a first polishing surface formed inside the second polishing surface, the first polishing surface being composed of abrasive grains having a small roughness for second finishing the protruding end, wherein the second polishing surface is a glass of the liquid crystal display panel during polishing. In order to protect the substrate is characterized by having a predetermined inclination angle in the outer corner area.

LCD panel, polishing wheel, double polishing surface

Description

Grinding wheel for liquid crystal display and polishing method using same {{GRINDER WHEEL FOR LIQUID CRYSTAL DISPLAY DEVICE AND GRINDING METHOD USING THE SAME}

1 is a schematic cross-sectional view of a liquid crystal display panel formed by combining a first mother substrate on which thin film transistor array substrates are formed and a second mother substrate on which color filter substrates are formed.

2 is an enlarged view of the protruding end of the cut substrate.

3 is a plan view schematically showing the structure of a general polishing wheel.

4 is a plan view schematically showing the structure of a unit liquid crystal display panel individually cut through the polishing wheel of the present invention.

5A and 5B are a cross-sectional view and a plan view schematically showing a polishing wheel according to a first embodiment of the present invention.

6 is a plan view schematically showing a polishing wheel according to a second embodiment of the present invention;

FIG. 7 is an enlarged cross-sectional view of the polishing surface of the polishing wheel illustrated in FIGS. 5A and 5B.

8 is a view schematically showing a polishing process of the present invention.

9 is a cross-sectional view schematically showing a polishing method using a polishing wheel of the present invention.

** Description of symbols for the main parts of the drawing **

100 liquid crystal display panel 101 array substrate

102 color filter substrate 140 loading portion

150: polishing unit 151: polishing table

160: unloading portion 170,170 ': polishing wheel

174,174 ', 274 Polishing surface 174A, 174A', 274A First polishing surface

174B, 174B ', 274B: Second Polished Surface

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing wheel for a liquid crystal display device, and more particularly, to a liquid crystal display panel which cuts liquid crystal display panels fabricated on a large area mother substrate into individual unit liquid crystal display panels and then polishes the unit liquid crystal display panels. A polishing wheel for an apparatus and a polishing method using the same.

Recently, with increasing interest in information display and increasing demand for using a portable information carrier, a lightweight flat panel display (FPD), which replaces a conventional display device, a cathode ray tube (CRT), is used. The research and commercialization of Korea is focused on. In particular, a liquid crystal display (LCD) is a device that displays an image using optical anisotropy of liquid crystal, and is actively applied to a laptop or a desktop monitor because it is excellent in resolution, color display, and image quality. It is becoming.

Hereinafter, the liquid crystal display device will be described in detail.

A general liquid crystal display device includes a liquid crystal display panel including a driving circuit unit, a backlight unit disposed under the liquid crystal display panel to emit light to the liquid crystal display panel, and the backlight unit and the liquid crystal display panel. It consists of a mold frame (case) and a case (supporting).

In particular, the liquid crystal display panel is largely composed of a color filter substrate and an array substrate and a liquid crystal layer formed between the color filter substrate and the array substrate.

The color filter substrate distinguishes between a color filter composed of sub-color filters of red (R), green (G), and blue (B) colors that implement color, and the sub-color filter, and the liquid crystal layer. It consists of a black matrix to block the light passing through, and a transparent common electrode to apply a voltage to the liquid crystal layer.

The array substrate may include a plurality of gate lines and data lines arranged vertically and horizontally on the substrate to form a plurality of pixel regions, and thin film transistors (TFTs), which are switching elements formed in an intersection region of the gate lines and data lines. And a pixel electrode formed on the pixel region.

The array substrate and the color filter substrate configured as described above are joined to face each other by sealants formed on the outer side of the image display area to form a liquid crystal display panel, and the bonding of the two substrates is formed on the array substrate or the color filter substrate. This is accomplished through the lock key.

In general, a liquid crystal display device includes a plurality of liquid crystal displays by forming thin film transistor array substrates on a large area mother substrate, color filter substrates on a separate mother substrate, and then bonding two mother substrates to improve yield. Panels are simultaneously formed, and a process of cutting the liquid crystal display panels into a plurality of unit liquid crystal display panels is required.

In general, the unit liquid crystal display panel is cut by using a wheel having a hardness higher than that of glass, and forming a groove to be cut on the surface of the mother substrate, and causing cracks to propagate along the groove to be cut. The liquid crystal display will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a liquid crystal display panel formed by combining a first mother substrate on which thin film transistor array substrates are formed and a second mother substrate on which color filter substrates are formed.

As shown in the drawing, the unit liquid crystal display panels are formed such that one side of the thin film transistor array substrates 1 protrudes relative to the color filter substrates 2. This is because a gate pad portion (not shown) and a data pad portion (not shown) are formed at edges of the thin film transistor array substrates 1 that do not overlap the color filter substrates 2.

Accordingly, the color filter substrates 2 formed on the second mother substrate 30 may have a first dummy region corresponding to an area where the thin film transistor array substrates 1 formed on the first mother substrate 20 protrude. Are spaced apart by (31).

In addition, each of the unit liquid crystal display panels may be appropriately disposed to make the best use of the first and second mother substrates 20 and 30, and may vary depending on a model. 32) spaced apart.

After the first mother substrate 20 on which the thin film transistor array substrates 1 are formed and the second mother substrate 30 on which the color filter substrates 2 are formed are bonded, the liquid crystal display panels are individually cut. The first dummy region 31 formed in the region where the color filter substrates 2 of the mother substrate 30 are spaced apart from the second dummy region 32 that separates the unit liquid crystal display panels is simultaneously removed.

After cutting the liquid crystal display panels separately from the second mother substrate 30, sharp edges of the unit liquid crystal display panel may be polished to form a conductive film on the thin film transistor array substrate 1. Short circuits formed on the edges of the thin film transistor array substrate 1 are removed to block static electricity, and debris from the edges of the unit liquid crystal display panel is removed by an external impact. The risk of being injured by the sharp edges of the liquid crystal display panel can be prevented.

That is, as shown in Figure 2, the side of the array substrate (1) and the color filter substrate (2) cut by the impact is formed an edge (40) protruding outward, the cut scratches This happens in common at all points that intersect each other.

The protrusion 40 is removed using a grinder wheel, and FIG. 3 is a plan view schematically showing the structure of a general polishing wheel.

As shown in the figure, the polishing wheel 70 has a structure in which the polishing surface 74 is formed at the edge of the upper surface of the disk-shaped polishing tool 71.

A hole 77 is formed at the center of the polishing wheel 70, which is for mounting the polishing tool 71 to the spin of the motor.

As such, in general, the polishing wheel 70 having one polishing surface 74 is used in the polishing process of the liquid crystal display panel. Thus, the polishing surface 74 of the same portion is polished through the polishing surface 74. ), The life of the polishing wheel 70 is shortened because it must be used continuously. In addition, the area of the protruding end (40 in FIG. 2) in contact with the polishing surface 74 during the high-speed polishing has a problem of being left unpolished with one polishing surface 74.

In addition, when the polishing wheel 70 is used for a long time, a certain portion of the polishing surface 74 wears due to continuous use of the same portion, resulting in a poor polishing state.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a polishing wheel for a liquid crystal display device and a polishing method using the same to improve polishing quality and increase a replacement cycle of the polishing wheel during the polishing process.

Further, another object of the present invention is to provide a polishing wheel for a liquid crystal display device and a polishing method using the same, which reduces polishing defects caused by uneven polishing at high speed.

In addition, another object of the present invention is to provide a polishing wheel for a liquid crystal display device and a polishing method using the same, which can shorten the polishing time and increase the production yield.

Further objects and features of the present invention will be described in the configuration and claims of the invention which will be described later.

In order to achieve the above object, the polishing wheel for a liquid crystal display device of the present invention is a cylindrical body; A second polishing surface formed at an upper edge of the body; And a first polishing surface formed inside the second polishing surface, wherein the first polishing surface and the second polishing surface are composed of abrasive stones having the same roughness, while the second polishing surface on the outside is polished. In order to protect the glass substrate of the liquid crystal display panel, it has a predetermined inclination angle in the outer corner area.
Another polishing wheel for a liquid crystal display device of the present invention is a cylindrical body; A second polishing surface formed on the upper edge of the body and composed of abrasive stone having a large roughness for roughing the protruding end of the glass substrate of the liquid crystal display panel primarily; And a first polishing surface formed inside the second polishing surface, the first polishing surface being composed of abrasive grains having a small roughness for second finishing the protruding end, wherein the second polishing surface is a glass of the liquid crystal display panel during polishing. In order to protect the substrate is characterized by having a predetermined inclination angle in the outer corner area.

In addition, the polishing method of the present invention comprises the steps of transferring the unit liquid crystal display panel to the loading unit; Moving the unit liquid crystal display panel transferred to the loading unit to a polishing table; A cylindrical body, a second polishing surface formed at an upper edge of the body, and a first polishing surface formed inside the second polishing surface, wherein the first polishing surface and the second polishing surface have the same roughness. Providing a polishing wheel having a predetermined inclination angle in an outer corner region of the outer second polishing surface, wherein the outer second polishing surface protects the glass substrate of the liquid crystal display panel during polishing; Polishing the cut surface and the corner portion of the liquid crystal display panel using the first and second polishing surfaces of the polishing wheel; And transferring the polished liquid crystal display panel to the unloading unit.
Another polishing method of the present invention comprises the steps of transferring the individually cut unit liquid crystal display panel to the loading unit; Moving the unit liquid crystal display panel transferred to the loading unit to a polishing table for polishing a cut surface and a corner portion; Aligning the unit liquid crystal display panel with the polishing table such that an edge of the unit liquid crystal display panel protrudes from the polishing table; Providing a polishing wheel comprising a cylindrical body, a second polishing surface formed of abrasive grains having a large roughness at an upper edge of the body, and a first polishing surface formed of abrasive grains having a small roughness inside the second polishing surface; Roughly polishing the cut surface and the corner portion of the unit liquid crystal display panel using the second polishing surface of the polishing wheel; Secondly polishing the cut surface and the corner portion of the first polished unit liquid crystal display panel using the first polishing surface of the polishing wheel; And transferring the first and second polished unit liquid crystal display panels to the unloading unit.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the polishing wheel for a liquid crystal display device and a polishing method using the same according to the present invention.

4 is a plan view schematically illustrating a structure of a unit liquid crystal display panel individually cut through the polishing wheel of the present invention.

As illustrated in the drawing, the unit liquid crystal display panel 110 may include a pixel signal 113, which is an image display area in which liquid crystal cells are arranged in a matrix, and gate signals GL1 to GLm of the pixel parts 113. A data driver integrated circuit (not shown) to which the image information is applied to the gate pad unit 114 and the data lines DL1 to DLn of the pixel unit 113 for connecting to a gate driver integrated circuit (not shown) to which is applied. And a data pad section 115 for connecting therewith.

In this case, the gate pad part 114 and the data pad part 115 are formed in the edge region of the thin film transistor array substrate 101 with one short side and one long side protruding from the color filter substrate 102.

Although not shown in detail in the drawing, a thin film transistor for switching liquid crystal cells is formed in a region where the data lines DL1 to DLn and the gate lines GL1 to GLm vertically cross the thin film transistor array substrate 101. And a pixel electrode connected to the thin film transistor to apply an electric field to the liquid crystal cells.

In addition, the color filter substrate 102 includes color filters separated by cell regions by a black matrix and a common electrode which is a counter electrode of a pixel electrode formed on the thin film transistor array substrate 101.

The thin film transistor array substrate 101 and the color filter substrate 102 configured as described above are provided with a cell gap so as to be uniformly spaced apart from each other, and bonded by a seal pattern (not shown) formed on the outer side of the pixel portion 113. A liquid crystal layer (not shown) is formed in the spaced space between the thin film transistor array substrate 101 and the color filter substrate 102.

Hereinafter, the structure of the polishing wheel for polishing the unit liquid crystal display panel 110 individually cut as described above will be described in detail with reference to the accompanying drawings.

5A and 5B are a cross-sectional view and a plan view schematically showing a polishing wheel according to a first embodiment of the present invention.

As shown in the drawing, the polishing wheel 170 of the present embodiment extends from the main shaft 172 and the main shaft 172 to the cylindrical body 171 and rotates in the same direction as the main shaft 172 (173) ) Is formed.

The double polishing surface 174 of the first polishing surface 174A and the second polishing surface 174B for polishing the liquid crystal display panel is formed on the cylindrical body 171. The first polishing surface 174A and the second polishing surface 174B may also be referred to as whetstone or abrasive stone, and are substantially formed in a ring shape. In particular, since the polishing surface 174 substantially functions to polish a glass substrate, a material stronger than glass is used, and natural materials include diamond, quartz, diatomaceous earth, and the like, silicon carbide and aluminum oxide. , Iron oxide, chromium oxide and the like.

As such, the polishing surface 174 of the present embodiment includes a first polishing surface 174A and a second polishing surface 174B respectively formed on the inner side and the outer side of the upper surface of the polishing wheel 170, where the outer polishing surface ( 174B) may be composed of abrasive grain having a large roughness for roughing, and the inner abrasive surface 174A may be composed of abrasive grain having a small roughness for finishing. At this time, the roughness of the outer polishing surface 174B and the inner polishing surface 174A may be configured to have a difference of about 50 to 100 mesh. However, the present invention is not limited thereto, and the first polishing surface 174A and the second polishing surface 174B may be made of abrasive stone having the same roughness.

The main shaft 172 is connected to a power shaft (not shown) that gives a rotational force so that the rotation shaft 173 makes a rotational movement.

In addition, the rotation shaft 173 functions to transmit a rotational torque applied from the main shaft 172 to the first and second polishing surfaces 174A and 174B.

In addition, the first polishing surface 174A and the second polishing surface 174B may be divided into a plurality of portions as shown, wherein the portion is a plurality of grooves 176 formed along the double polishing surface 174. Is done through. However, the present invention is not limited thereto and may be applied to a polishing wheel having a single structure shown in FIG. 6.

FIG. 6 is a plan view schematically illustrating a polishing wheel according to a second exemplary embodiment of the present invention. As shown in the drawing, the polishing wheel 270 having a structure in which the double polishing surface 274 is not separated is illustrated. . Here, the polishing wheel 270 of the second embodiment is a double polishing surface having the first polishing surface 274A and the second polishing surface 274B formed on the cylindrical body 271 in the same manner as the polishing wheel of the second embodiment. It has a structure of (274).

FIG. 7 is an enlarged cross-sectional view of the polishing surface of the polishing wheel A shown in FIGS. 5A and 5B.

As shown in the figure, the polishing wheel 170 of this embodiment includes a first polishing surface 174A for primary polishing and a second polishing surface 174B for secondary polishing. The second polishing surfaces 174A and 174B are spaced apart from each other at regular intervals.

Here, the second polishing surface 174B has a predetermined inclination angle α in the outer corner region to protect the glass substrate of the liquid crystal display panel during polishing, and the inclination angle α of the second polishing surface 174B. ) Is 20 to 40 degrees with respect to the longitudinal direction (X-axis direction) of the second polishing surface 174B, and preferably 30 degrees.

As described above, the first polishing surface 174A and the second polishing surface 174B may be composed of abrasive stones of the same abrasive material, and effective polishing is performed when the secondary polishing is sequentially performed after the first polishing. For this purpose, the first polishing surface 174A and the second polishing surface 174B may be composed of abrasive stones having different roughnesses.

For example, in the case of polishing using the double polishing surface 174 having the different roughness, the protruding end first of the polishing wheel 170 and the protruding end (not shown) of the substrate pass in opposite directions. It is roughed by the 2nd polishing surface 174B formed in the inside, and is then finished by the inside 1st polishing surface 174A. Here, the present embodiment will be described by taking a case where the first polishing is performed using the second polishing surface 174B on the outer side and then the second polishing is performed using the first polishing surface 174A on the inner side. However, the present invention is not limited thereto, and polishing may be performed by reversing the order of the polishing surfaces 174A and 174B used for the primary polishing and the secondary polishing.

As such, when the sequential double polishing is performed using the two polishing surfaces 174A and 174B, the polishing characteristics can be improved and the polishing time can be shortened. The two polishing surfaces 174A and 174B can also be reduced. In the case where the polishing is performed at the same time, the protruding end contacts the outer and inner polishing surfaces 174A and 174B of the polishing wheel 170 at the same time, thereby increasing the contact area therebetween, so that the polishing surfaces 174A and 174B By dispersing the concentration, it is possible to extend the life of the polishing wheel 174. Hereinafter, the polishing method using the polishing wheel 170 will be described in detail with reference to the accompanying drawings.

8 is a view schematically showing a polishing process of the present invention, Figure 9 is a cross-sectional view schematically showing a polishing method using a polishing wheel of the present invention.

9 illustrates a polishing process of polishing the edges of the liquid crystal display panel loaded on the polishing table using the polishing wheel of the present invention.

Referring to the drawings, first, the individually cut unit liquid crystal display panel 110 is transferred to the loading unit 140 to polish the cut surface and the corner portion.

Here, the manufacturing of the unit liquid crystal display panel 110 is largely a driving element array process for forming a driving element on the lower array substrate 101 and a color filter process for forming a color filter on the upper color filter substrate 102 and a cell ( cell) process, which is described as follows.

First, a thin film transistor which is a driving element arranged on the lower array substrate 101 by an array process to form a plurality of gate lines and data lines defining pixel regions, and connected to the gate lines and data lines in each of the pixel regions. To form. In addition, the pixel electrode is connected to the thin film transistor through the array process to drive the liquid crystal layer as a signal is applied through the thin film transistor.

In addition, the upper color filter substrate 102 is formed with a color filter layer composed of red, green, and blue sub-color filters that implement color by a color filter process, a black matrix, and a common electrode.

Subsequently, after the alignment films are applied to the surface of the array substrate 101 and the color filter substrate 102, the alignment control force is applied to the liquid crystal molecules of the liquid crystal layer formed between the array substrate 101 and the color filter substrate 102. The alignment film is rubbed to provide a surface fixation force (ie, pretilt angel and orientation direction). In addition, a spacer is disposed on the array substrate 101 to maintain a constant cell gap, and a sealant is applied to the outside of the color filter substrate 102, and then pressure is applied to the array substrate 101 and the color filter substrate 102. Add it and attach it.

On the other hand, the array substrate 101 and the color filter substrate 102 is made of a large glass substrate. In other words, a plurality of panel regions are formed on a large glass substrate, and a thin film transistor and a color filter layer, which are driving elements, are formed in each of the panel regions. Must be cut and processed.

That is, a cutting line is formed on each surface or one surface of the array substrate 101 and the color filter substrate 102 on which the bonding is completed, and the unit liquid crystal display panel 110 is manufactured by cutting along the cutting line.

When the above scribe process is completed, the cut surface and the edge portion of the glass substrate are not smooth, so the cut surface and the edge portion must be smoothly polished.

To this end, the unit liquid crystal display panel 110 loaded on the loading unit 140 is transferred to the polishing table 151, is aligned with the polishing table 151, and then rotates at a high speed. Through the polishing, the cut surface and the corner portion of the unit liquid crystal display panel 110 are polished.

The polishing table 151 may be designed to be slightly smaller in size than the unit liquid crystal display panel 110 so that the edge of the unit liquid crystal display panel 110 is polished to be inclined and the unit liquid crystal display panel 110 can be effectively supported. . Accordingly, the edge of the unit liquid crystal display panel 110 slightly protrudes from the polishing table 151.

Here, reference numerals 170 and 170 ′ denote first and second polishing wheels for polishing upper and lower edges of the array substrate 101 and the color filter substrate 102, respectively. The polishing wheels 170 and 170 'move in one direction to polish upper and lower edges of the array substrate 101 or the color filter substrate 102.

At this time, the first polishing wheel 170 and the second polishing wheel 170 'of the present embodiment have double polishing surfaces 174 and 174', as described above, and the first polishing wheel 170 and the first polishing wheel 170 ' The polishing surfaces 174 and 174 'of the second polishing wheel 170' are respectively the first polishing surfaces 174A and 174A 'for the primary polishing and the second polishing surfaces 174B and 174B' for the secondary polishing. consist of.

As such, by polishing the double wheels 174 and 174 'by using the abrasive stones of the polishing wheels 170 and 170' in duplicate, the polishing quality can be improved through the primary and secondary polishing, and the concentration of the abrasive stones By dispersing it, the life of the polishing surfaces 174 and 174 'can be improved. In addition, as the lifespan of the polishing surfaces 174 and 174 'is improved, the replacement time of the polishing surfaces 174 and 174' can be extended, thereby reducing cost and process loss.

The primary polishing using the first polishing surfaces 174A and 174A 'and the secondary polishing using the second polishing surfaces 174B and 174B' may be simultaneously performed. The first polishing surfaces 174A and 174A 'may be simultaneously formed. After performing primary polishing used, secondary polishing may be performed using the second polishing surfaces 174B and 174B '. Conversely, after performing the first polishing using the second polishing surfaces 174B and 174B ', the second polishing may be performed using the first polishing surfaces 174A and 174A'.

In addition, during the first and second polishing processes, the polishing table 151 or the polishing wheels 170 and 170 'loaded with the liquid crystal display panel 110 may be moved and then polished. Polishing may be performed by moving the polishing table 151 or the polishing wheels 170 and 170 '.

In the present exemplary embodiment, two polishing wheels 170 and 170 'are used to polish the glass substrates 101 and 102 of the liquid crystal display panel 110. However, the present invention is not limited thereto. One, three or more polishing wheels may be used.

Thereafter, the polished unit liquid crystal display panel 110 is received from the polishing unit 150 and unloaded to the unloading unit 160 to be transported for the next process.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Therefore, the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

As described above, the polishing wheel for the liquid crystal display device and the polishing method using the same according to the present invention provide an effect of improving polishing quality by performing primary and secondary polishing using a double polishing surface.

In addition, by dispersing the concentration of the polishing surface during polishing can improve the life of the polishing wheel, it is possible to extend the replacement time of the polishing surface can reduce the cost and process loss. In addition, the time required for replacement can be reduced, thereby providing an effect of improving productivity.

Claims (18)

delete delete delete Cylindrical body; A second polishing surface formed on the upper edge of the body and composed of abrasive stone having a large roughness for roughing the protruding end of the glass substrate of the liquid crystal display panel primarily; And A first polishing surface formed inside the second polishing surface, the first polishing surface being made of abrasive stone having a small roughness to finish the projecting end secondly, the second polishing surface being a glass substrate of the liquid crystal display panel during polishing; Polishing wheel, characterized in that having a predetermined inclination angle in the outer corner area to protect the. 5. The abrasive wheel of claim 4, wherein the roughness of the first polishing surface and the second polishing surface is about 50-100 meshes. The polishing wheel according to claim 4, wherein the first polishing surface is positioned a predetermined distance away from the second polishing surface in the inner direction of the body. 5. The polishing wheel according to claim 4, wherein the first polishing surface and the second polishing surface are composed of a plurality of parts. The polishing wheel according to claim 4, wherein the second polishing surface has an inclination angle of 20 to 40 degrees with respect to its longitudinal direction. delete delete delete delete Transferring the individually cut unit liquid crystal display panels to the loading unit; Moving the unit liquid crystal display panel transferred to the loading unit to a polishing table for polishing a cut surface and a corner portion; Aligning the unit liquid crystal display panel with the polishing table such that an edge of the unit liquid crystal display panel protrudes from the polishing table; Providing a polishing wheel comprising a cylindrical body, a second polishing surface formed of abrasive grains having a large roughness at an upper edge of the body, and a first polishing surface formed of abrasive grains having a small roughness inside the second polishing surface; Roughly polishing the cut surface and the corner portion of the unit liquid crystal display panel using the second polishing surface of the polishing wheel; Secondly polishing the cut surface and the corner portion of the first polished unit liquid crystal display panel using the first polishing surface of the polishing wheel; And And transferring the primary and secondary polished unit liquid crystal display panels to an unloading unit. 15. The method of claim 13, wherein the polishing table is designed to be smaller in size than the unit liquid crystal display panel. delete delete The method of claim 13, wherein the second polishing surface has an inclination angle of 20 to 40 degrees with respect to the longitudinal direction thereof. 15. The method of claim 13, wherein the unit liquid crystal display panel is polished by moving the polishing wheel in one direction.

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