KR20050064175A - Apparatus for grinding in liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding apparatus for a liquid crystal display device which can perform grinding without replacing a polishing table. The present invention relates to a plurality of polishing tables having different concentric sizes, and one or some of the polishing tables are combined. And optionally a support shaft for vertically moving the polishing tables so that one polishing table surface faces up, a support for supporting the polishing tables and the support shafts, and a symmetrical position on the left and right sides of the incoming liquid crystal panel. It characterized in that it comprises a top and bottom wheel to perform the sub-ground.

Description

Grinding equipment for liquid crystal display device {Apparatus for Grinding in Liquid Crystal Display Device}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of liquid crystal displays, and more particularly, to grinding equipment for a liquid crystal display device capable of performing grinding without replacing the polishing table.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELD), and vacuum fluorescent (VFD) Various flat panel display devices such as displays have been studied, and some of them are already used as display devices in various devices.

Among them, LCD is the most widely used as the substitute for CRT (Cathode Ray Tube) for mobile image display device because of its excellent image quality, light weight, thinness, and low power consumption. In addition to the use of the present invention has been developed in various ways such as a television and a computer monitor for receiving and displaying broadcast signals.

In order to use such a liquid crystal display as a general screen display device in various parts, it is a matter of how high quality images such as high definition, high brightness and large area can be realized while maintaining the characteristics of light weight, thinness and low power consumption. Can be.

A general liquid crystal display device may be largely divided into a liquid crystal panel displaying an image and a driving unit for applying a driving signal to the liquid crystal panel, wherein the liquid crystal panel includes first and second glass substrates bonded to each other with a predetermined space; It consists of a liquid crystal layer injected between the said 1st, 2nd glass substrate.

Here, the first glass substrate (TFT array substrate) has a plurality of gate lines arranged in one direction at regular intervals, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing a gate line and a data line, and a plurality of thin film transistors switched by signals of the gate line to transfer the signal of the data line to each pixel electrode. Is formed.

The second glass substrate (color filter substrate) includes a light shielding layer for blocking light in portions other than the pixel region, an R, G, and B color filter layers for expressing color colors, and a common electrode for implementing an image. Is formed.

The first and second glass substrates are bonded to each other by a seal material having a predetermined space by a spacer and having a liquid crystal injection hole, so that the liquid crystal is injected between the two substrates.

Here, in the liquid crystal injection method, the liquid crystal is injected between the two substrates by osmotic pressure when the liquid crystal injection hole is immersed in the liquid crystal container by maintaining the vacuum state between the two substrates bonded by the real material. When the liquid crystal is injected as described above, the liquid crystal injection hole is sealed with a sealing material.

The driving principle of the general liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. Since the liquid crystal is thin and long in structure, the liquid crystal has directivity in the arrangement of molecules, and the direction of the arrangement of molecules can be controlled by artificially applying an electric field to the liquid crystal. Therefore, when the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal by optical anisotropy, thereby representing image information.

Currently, an active matrix LCD, in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner, is attracting the most attention due to its excellent resolution and ability to implement video.

Hereinafter, a grinding apparatus and a grinding method using the same of a conventional liquid crystal display will be described with reference to the accompanying drawings.

1A and 1B are plan views illustrating first and second disc glasses on which a plurality of upper and lower substrates are formed, respectively.

As shown in FIGS. 1A and 1B, the liquid crystal panel of the liquid crystal display device accurately measures the first disc glass 1 in which a plurality of upper substrates 11 are formed and the second disc glass 2 in which a plurality of lower substrates 12 are formed. After opposing and bonding, after forming a scribe line which distinguishes each unit panel, it breaks and forms a unit panel, and then liquid crystal is inject | poured into each unit panel. Here, when scribing and breaking each of the unit panels, the substrate is cut slightly larger than the actual liquid crystal display panel, and then subjected to grinding to polish the edge of the liquid crystal panel.

On the other hand, each of the plurality of upper substrates 11, R, G, B color filters, black matrix is formed in an array form, the common electrode is formed on the front.

Each of the plurality of lower substrates 12 includes a gate line defining a pixel area vertically crossing each other, a data line, a thin film transistor formed at an intersection of the gate line and the data line, and a pixel formed in the pixel area. The electrodes are formed in an array. The reason why the lower substrate 12 is formed larger than that of the upper substrate 11 is that the lower substrate 12 has a pad portion for applying a driving signal to the gate line and the data line.

2 is a plan view showing a state in which the upper and lower substrates are bonded and the shorting bar.

As shown in FIG. 2, after scribing and breaking, the liquid crystal panel to which the upper and lower substrates 11 and 12 are bonded is formed with the first and second shorting bars connected to the metal wires 13 and 15 formed on the gate pad and the source pad, respectively. 14a and 14b are removed and a polishing process is performed to round the edge portion of the liquid crystal panel. This is to prevent breakage of the liquid crystal panel after breaking, because the side edge portion is sharp, and is damaged by an impact occurring in a subsequent process.

Subsequently, a liquid crystal panel assembly (Liquid Crystal Panel Assembly) is connected to the lower substrate pad part by connecting a Tape Carrier Package (TCP) and a Printed Circuit Board (PCB) on which a drive driver IC is mounted. To produce. The LCD panel assembly is combined with a backlight assembly and a chassis to manufacture an LCD module, and the LCD module and a case are combined to produce a liquid crystal display device.

When the first and second shorting bars 14a and 14b connected to the pad part of the lower substrate 12 are electrostatically applied to any one of a plurality of gate lines or data lines due to static electricity generated during the process, Since the breakage of the thin film transistor element may occur, it is formed to buffer the concentration of static electricity.

3A and 3B are diagrams illustrating grinding of liquid crystal panels corresponding to different sizes, respectively.

FIG. 3A illustrates the grinding of a liquid crystal panel having a smaller size than that of FIG. 3B. A polishing table 21b having a size slightly smaller than that of the liquid crystal panel is located under the liquid crystal panel 20a. As such, the reason why the liquid crystal panel 20a is larger than the polishing table 21b is that the first and second upper polishing wheels 31a and 31b and the first and second lower polishing wheels 32a and 32b are larger. ) Rotates about the first and second upper polishing wheels 31a and 31b with respect to the first and second rotating shafts 34a and 34b, respectively. When rotating with respect to the wheels 32a and 32b, the third rotary shaft 33a and the fourth rotary shaft 33b are rotated, respectively, and when the polishing is performed, the polishing table 21a under the liquid crystal panel 20a is used. ) To avoid damage.

FIG. 3B illustrates a process of polishing the liquid crystal panel 20b having a larger size than the liquid crystal panel 20a shown in FIG. 3A. The liquid crystal panel 20b and the polishing table 21b respectively show the process of FIG. 3A. Except for being relatively larger than that shown in the drawing, the polishing wheels 31a, 31b, 32a, and 32b which operate in correspondence with the edge portion of the liquid crystal panel 20b, or the rotational axes 33a, 33b, 34a, which are reference axes thereof. 34b) are all the same as shown in FIG. 3A.

3A and 3B, the separation distance between the first upper and lower wheels 31a and 32a and the second upper and lower wheels 31b and 32b respectively corresponds to the length of the horizontal or vertical lengths of the liquid crystal panels 20a and 20b.

As described above, the grinding apparatus of the conventional liquid crystal display and the grinding method using the same have the following problems.

According to the size of the liquid crystal panel, a polishing table having a different size is required. In addition, since only one polishing table is provided in the grinding equipment, a separate grinding table having different polishing tables may be manufactured even if different sizes of substrates are manufactured on the original glass. It is a hassle to grind with equipment.

In addition, after scribing and breaking the original glass, there is a problem in that the process time required for grinding is increased because replacement of a plurality of polishing tables is performed during subsequent grinding.

The present invention has been made to solve the above problems, and an object thereof is to provide grinding equipment of a liquid crystal display device which can perform grinding without replacing the polishing table.

Grinding equipment of the liquid crystal display device of the present invention for achieving the above object is a plurality of polishing tables of different sizes having concentricity, and one or a part of the plurality of polishing tables are optionally combined Performing grinding of the edge portion of the liquid crystal panel by symmetrically positioned on the left and right sides of the support shaft for vertically moving the polishing tables so that the polishing table surface faces up, a support for supporting the polishing tables and the support shaft, and an incoming liquid crystal panel; It is characterized by including the upper and lower wheels.

The plurality of polishing tables may include a first polishing table corresponding to a liquid crystal panel corresponding to a minimum area, and a polishing corresponding to a liquid crystal panel having a predetermined size on an upper surface of the first polishing table when combined with the first polishing table. And a second to nth (n ≧ 2) polishing tables that form a table surface and are formed such that the central portion is removed by a predetermined thickness and in turn increases in size.

When the second to nth polishing tables comprise a polishing table surface of a predetermined degree, the lower polishing tables are all combined to form the polishing table surface.

Each of the second to nth polishing tables surrounds the polishing table one order less.

The upper and lower wheels form an angle of 30 ° to 60 ° with respect to the horizontal plane of the liquid crystal panel.

The liquid crystal panel flows into the polishing table surface.

Hereinafter, the grinding equipment of the liquid crystal display of the present invention will be described in detail with reference to the accompanying drawings.

4 is a schematic view showing the grinding equipment of the liquid crystal display of the present invention.

As shown in FIG. 4, the grinding equipment of the liquid crystal display device of the present invention includes a plurality of polishing tables 45, 46, 47 having different sizes with concentricity, and the plurality of polishing tables 45, 46, 47. Support shaft 44 for moving the polishing tables up and down so that one or a part of them are combined to selectively raise one polishing table surface, and support the polishing tables 45, 46, 47 and support shaft 44. And upper and lower wheels 48a, 48b, 49a, and 49b positioned symmetrically to the left and right of the support 42 and the incoming liquid crystal panel 40 to perform edge grounding of the liquid crystal panel 40.

In FIG. 4, three polishing tables 45, 46, and 47 are configured, but the number of polishing tables may be increased or decreased according to the number of sizes corresponding to the liquid crystal panel.

In addition, in FIG. 4, the combined state when the second polishing table 46 and the third polishing table 47 correspond to the first polishing table 45 corresponding to the smallest size, respectively, is indicated by dotted lines. .

The plurality of polishing tables may include a first polishing table 45 corresponding to a liquid crystal panel corresponding to a minimum area, a center portion of which is removed from the first polishing table 45, and a predetermined thickness is removed from the first polishing table 45. And a second polishing table 46 forming a larger polishing table surface on the upper surface than the area occupied by the first polishing table 45, and a central portion of the second polishing table 46 around the second polishing table 46. A third polishing table 47 is formed to remove the thickness and to form a polishing table larger than the area occupied by the second polishing table 45 in combination with the second polishing table 46.

Here, the size and thickness at which the center of the second polishing table 46 is removed are the size and thickness of the first polishing table 45 and the size and thickness at which the center of the third polishing table 47 is removed. The size corresponds to the size and thickness occupied by the first and second polishing tables 45 and 46.

Accordingly, when the first and second polishing tables 45 and 46 are coupled, the first and second polishing tables 45 and 46 are positioned on the same upper surface through the support shaft 44 to allow the first and second polishing tables 45 and 46 to be coupled to each other. The grinding process may be performed on the liquid crystal panel having a larger size than that of the polishing table 45. Similarly, when the first, second and third polishing tables 45, 46 and 47 are coupled, all of the first, second and third polishing tables 45, 46 and 47 are supported by the support shaft 44. The grinding process may be performed on the liquid crystal panel having a size larger than that of the second polishing table 46 by being positioned on the same upper surface through the second polishing table 46.

Here, the smallest size of the first polishing table 45 has a rectangular shape, and the remaining polishing tables are formed in a shape surrounding the polishing tables of smaller size. Therefore, the central portion thereof is removed to a predetermined thickness and size.

It should be noted that when a high degree polishing table is located on the top surface, the low degree polishing table must be coupled to the high degree polishing table.

The liquid crystal panel positioned on the polishing table surface formed by the polishing tables has a larger size than that of the polishing table surface. The reason is that the part where the actual grinding is made corresponds to the edge part of the liquid crystal panel. In this case, the liquid crystal panel has an edge portion corresponding to the upper and lower wheels protruding from the polishing table surface, and the upper and lower wheels positioned at the left and right sides of the liquid crystal panel form an angle of about 30 to 60 ° with respect to the liquid crystal panel surface, Rotation is performed by reference and grinding is performed.

Looking at the grinding method in detail:

Here, the first upper and lower wheels 48a and 49a are rotated by 360 ° with respect to the first center axis 50a and the second center axis 51a on the left side of the liquid crystal panel, respectively. The edge of the substrate is rounded, and a shorting bar formed on the lower substrate side is removed. Symmetrically, the second upper and lower wheels 48b and 49b rotate 360 degrees with respect to the third central axis 50b and the fourth central axis 51a, respectively, on the right side of the liquid crystal panel, respectively.

Here, the first and second upper and lower wheels 48a, 48b, 49a, and 49b are correspondingly approached around the liquid crystal panel to the upper side or the lower side of the polishing equipment in order to proceed grinding with the inflow of the liquid crystal panel.

5A and 5B are cross-sectional views illustrating liquid crystal panels of different sizes using the grinding equipment of FIG. 4.

5A and 5B, when the grinding equipment of the liquid crystal display device of the present invention is used, the support shaft is moved up and down without replacing the polishing table, and the polishing table surface is formed by combining predetermined polishing tables to form various sizes. Grinding may be performed on the liquid crystal panels 40a and 40b.

5A and 5B have different sizes of upper and lower substrates 61, 62, 63, and 64 constituting the liquid crystal panel because of driving for supplying driving signals to gate lines and data lines formed on the lower substrates 62, 64 side. This is because a circuit portion is formed.

FIG. 6 is a plan view and a cross-sectional view illustrating a bonding table of FIG. 4.

As shown in FIG. 6, when the polishing tables of the grinding equipment of the liquid crystal display device of the present invention are combined, the shape of the second polishing table 46 and the first polishing table 45 is inserted into the third polishing table 47. Becomes This is the upper surface forming the same horizontal plane and the smaller box is filled in the larger box.

7A to 7C are plan views and cross-sectional views showing a state in which one of the polishing tables of FIG. 4 is selectively used according to liquid crystal panels having different sizes, respectively.

As shown in FIG. 7A, when the liquid crystal panel having the smallest size corresponds to the grinding equipment of the present invention, the first polishing table 45 is positioned to the upper surface through the support shaft 44 so that only the first polishing table 45 is provided. The polishing table surface is determined, and the liquid crystal panel is introduced therein. Thus, the remaining second and third polishing tables 46 and 47 are near the support 42 without movement.

As shown in FIG. 7B, when the liquid crystal panel having a size slightly larger than that of FIG. 7A corresponds to the grinding equipment of the present invention, the second polishing table 46 is moved to the upper side where the first polishing table 45 is located. Through the support shaft 44, it is lifted up and engaged with the first polishing table 45 to determine the polishing table surface of the corresponding size of the outside of the second polishing table. In this case, only the remaining third polishing table 47 is positioned near the support 42.

As shown in FIG. 7C, when the liquid crystal panel having a larger size than that in FIG. 7B corresponds to the grinding equipment of the present invention, the third polishing table 47 is located on the upper side where the first and second polishing tables 45 and 46 are located. ), The first, second and third polishing tables 45, 46 and 47 are all joined together. Thus, the polishing table surface is determined to the corresponding size of the outside of the third polishing table 47. In this case, all the polishing tables 45, 46, 47 are located on the upper surface so that there is no polishing table located near the support 42.

Here, the size of the introduced liquid crystal panel is smaller than the size of the corresponding polishing table 7 to 8mm at equal intervals in all directions.

The grinding equipment of the liquid crystal display of the present invention as described above has the following effects.

Without replacing the polishing table, it is possible to correspond to the polishing table of various sizes by driving the driving shaft up and down according to the size of the liquid crystal panel to be introduced.

Therefore, it is possible to proceed the grinding process after scribing and breaking without replacing the polishing table, thereby reducing the process time.

1A and 1B are plan views showing first and second disc glasses on which a plurality of upper and lower substrates are formed, respectively.

2 is a plan view showing a state in which the upper and lower substrates are bonded and the shorting bar

3A and 3B illustrate grinding of liquid crystal panels corresponding to different sizes, respectively.

4 is a schematic diagram showing grinding equipment of a liquid crystal display of the present invention;

5A and 5B are cross-sectional views showing liquid crystal panels of different sizes using the grinding equipment of FIG.

6 is a plan view and a cross-sectional view showing a bonding table of FIG.

7A to 7C are plan views and cross-sectional views illustrating the selective use of one of the polishing tables of FIG. 4 according to liquid crystal panels of different sizes.

* Description of symbols on the main parts of the drawings *

40: liquid crystal panel 40a: first liquid crystal panel

40b: second liquid crystal panel 42: support

44 support shaft 45 first polishing table

46: second polishing table 47: third polishing table

48a: first upper abrasive wheel 48b: second upper abrasive wheel

49a: first lower abrasive wheel 49b: second lower abrasive wheel

50a: first polishing axis 50b: second polishing axis

51a: third polishing axis 51b: fourth polishing axis

61: upper substrate 62: lower substrate

63: upper substrate 64: lower substrate

Claims (6)

A plurality of polishing tables of different sizes with concentricity; A support shaft for vertically moving the polishing tables such that one or a portion of the plurality of polishing tables are coupled to selectively raise one polishing table surface; A support for supporting the polishing tables and the support shaft; And And upper and lower wheels positioned symmetrically to the left and right of the incoming liquid crystal panel to perform edge grinding of the liquid crystal panel. The method of claim 1, The plurality of polishing tables A first polishing table corresponding to the liquid crystal panel corresponding to the minimum area; Around the first polishing table, when the first polishing table is combined with the first polishing table, a polishing table surface corresponding to a liquid crystal panel having a predetermined size is formed on the upper surface, and the second to third portions are formed such that the center portion thereof is removed by a predetermined thickness and in turn increases in size. Grinding equipment of a liquid crystal display, characterized in that consisting of the n (n≥2) polishing table. The method of claim 2, The second to nth polishing tables And when a polishing table of a predetermined order forms the polishing table surface, all of the lower polishing tables are combined to form the polishing table surface. The method of claim 2, The second to nth polishing tables Grinding equipment of the liquid crystal display device, characterized in that each of the shape is wrapped around the polishing table by one order. The method of claim 1, And the upper and lower wheels form an angle of 30 ° to 60 ° with respect to a horizontal plane of the liquid crystal panel. The method of claim 1, The liquid crystal panel is introduced into the polishing table surface, the grinding equipment of the liquid crystal display device.