KR20000067395A - Method for removing shorting bar formed liquid crystal display panel and method for rounding liquid crystal display panel edge - Google Patents

Abstract

PURPOSE: A method for removing shorting bar of a liquid crystal display and a method for edge rounding using the same are prevent a damage of a liquid crystal display panel by removing a shorting bar. CONSTITUTION: A method for removing shorting bar of a liquid crystal display and a method for edge rounding using the same comprises the steps of: aligning a laser cutter(40) for scanning a laser beam to a position cutting a shorting bar(12,22); scanning a laser beam generated from the laser cutter to the cutting position; providing a cold fluid to the cutting position and cutting a TFT substrate and the shorting bar corresponding to the cutting position. A method for edge rounding using the same comprises the steps of: aligning a laser cutter for scanning a laser beam; and melting and rounding an edge of the TFT substrate.

Description

Method for removing shorting bar formed liquid crystal display panel and method for rounding liquid crystal display panel edge}

The present invention relates to a method of removing a shorting bar of an LCD panel and an edge rounding method using the same, and more particularly, by removing a shorting bar without contacting a shorting bar formed on the liquid crystal display panel. The present invention relates to a method for removing a shorting bar of a liquid crystal display panel to prevent damage to an element, and an edge rounding method for performing edge rounding of a liquid crystal display panel while removing the shorting bar in a non-contact manner.

In general, the liquid crystal device, which has been spotlighted as a substitute for the CRT (Cathode Ray tube) due to various advantages such as small size, light weight, and low power consumption, is used to reconstruct the liquid crystal injected into the liquid crystal panel due to the electric field strength. It is a flat panel display which actively uses optical shutter properties as long as light is passed through or blocked by the liquid crystal display panel by being arranged.

The liquid crystal display panel of the liquid crystal display device having such a function includes a TFT glass substrate having a plurality of TFT elements, a gate line connected to the TFT element, a data line orthogonal to the gate line, and a TFT substrate on which transparent pixel electrodes are formed, a common electrode, and RGB. A color filter substrate with a plurality of pixel and black matrices formed thereon is precisely opposed to a color filter glass mother substrate formed thereon to form an assembled substrate, and a scribe line is formed on the assembled substrate to form an LCD unit. It is produced by cutting slightly larger than the display panel

The liquid crystal display panel fabricated above is cut once more than the size of the actual liquid crystal display panel to be the same as the actual liquid crystal display panel, and then the liquid crystal injection, the encapsulation and the polarizing plate are attached, and the sharp side edge of the cut liquid crystal display panel. The edge rounding process by the grinder is performed to prevent the crack from being broken by the impact.

After that, the LCD panel assembly is manufactured by assembling a tape carrier package and a driving printed circuit board on which a drive drive IC is mounted, and the LCD panel assembly is combined with a backlight assembly and a chassis to manufacture an LCD module, and the LCD module and the case are combined. Thus, a liquid crystal display device is manufactured.

The liquid crystal display device may be used as a display device of a portable computer in combination with an external information processing device, or may be used as a display device that is combined with various work devices.

As such, the process of attaching a polarizing plate to the process of assembling the individualized liquid crystal display panel into a liquid crystal display panel assembly by cutting the LCD unit 중 during the manufacturing process of the liquid crystal display is a process that must be in contact with the operator. The static electricity is generated as a defective factor of the liquid crystal display panel.

As such, when a strong static electricity generated by an operator, a polarizing plate, or the like is applied to any one of a plurality of gate lines or data lines, a breakdown of the TFT element may occur, so as to buffer the concentration of static electricity. All gate lines and data lines are formed with an electrostatic buffer member called " shorting bar " as disclosed in US Pat. No. 5,767,928 " Liquid Crystal display device with shorting bar connected whth floating gate transistors. &Quot;

In this case, the shorting bar is used to test the liquid crystal display panel as described in US Patent Publication No. 5,081,687, "Method and apparatus for testing LCD panel array prior to shorting bar removal," in addition to the buffering of the electric shock by static electricity.

These shorting bars used for electrostatic buffering and some tests should be removed before the tape carrier package is mounted on the gate line and data line. The shorting bars are not removed by a separate shorting bar manufacturing process and are mainly used as a grinder. In the grinding edge edge rounding process, the edges of the liquid crystal display panel are removed together.

However, when the shorting bar is removed during the edge rounding process, the grinding type edge rounding device and the liquid crystal display panel which remove the shorting bar are inevitably contacted, and the shorting bar is cut off from the edge rounding device so that the data line is not electrically shorted. Since static electricity generated in the edge rounding device is applied to the gate line, breakage of the LCD panel may occur during the edge rounding process.

In addition, by using a device such as a grinder to physically remove the shorting bar and at the same time to perform the edge rounding of the corner portion of the liquid crystal display panel to clean the liquid crystal display panel to remove the glass tip and fine particles generated during the edge rounding by the grinder There is a problem that requires a cleaning process.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to remove a shorting bar formed on the liquid crystal display panel without being in contact with the liquid crystal display panel.

Another object of the present invention is to remove the shorting bar formed on the liquid crystal display panel without contacting the liquid crystal display panel and to round the edges of the liquid crystal display panel.

Another object of the present invention is to suppress the generation of glass tips and fine particles when removing the shorting bar so as not to clean the liquid crystal display panel.

Still other objects of the present invention will become more apparent from the following detailed description of the invention.

1 is a plan view showing an assembled substrate before removing the shorting bar of the liquid crystal display panel according to the present invention.

FIG. 2A is a perspective view illustrating a liquid crystal display panel obtained by cutting an LCD unit 형성된 formed on the assembly board of FIG. 1. FIG.

FIG. 2B is an enlarged view of the A circle in FIG. 2A; FIG.

FIG. 2C is an enlarged view of the B circle in FIG. 2A. FIG.

Figure 3 is a perspective view showing a preferred embodiment for removing the shorting bar of the liquid crystal display panel according to the present invention.

Figure 4 is a perspective view showing an embodiment of performing edge rounding while removing the shorting bar of the liquid crystal display panel according to the present invention.

FIG. 5 is an enlarged view of the I circle of FIG. 4; FIG.

FIG. 6 is an enlarged view of the II circle in FIG. 4. FIG.

7 is a perspective view showing another embodiment of removing the shorting bar of the liquid crystal display panel according to the present invention.

FIG. 8 is a perspective view of another embodiment in which edge rounding is performed after the shorting bar is removed by FIG. 7; FIG.

Fig. 9 is an enlarged view of the III circle in Fig. 8.

In the method for removing a shorting bar connected to a gate line or a data line formed to cross each other on the front of the TFT substrate of the liquid crystal display panel formed by cutting the LCD unit 쎌 formed on the assembled substrate for achieving the object of the present invention, TFT A laser cutter that scans a laser beam at a cutting position at which the shorting bar is to be cut at a predetermined distance from the rear surface of the substrate is aligned, the laser beam generated by the laser cutter is scanned to the cutting position, and a cooling fluid is supplied to the cutting position to cut the cutting position. The TFT substrate and the shorting bar corresponding thereto are cut.

In order to realize the object of the present invention, a shorting bar connected to a gate line or a data line formed to cross each other orthogonal to the front surface of the TFT substrate of the liquid crystal display panel formed by cutting the LCD unit 에 formed on the assembled substrate is removed, In the rounding method, alignment of a laser cutter which scans a laser beam at a position corresponding to the shorting bar so as to melt the edge of the TFT substrate positioned below the shorting bar with the shorting bar removed and removed from the front surface of the TFT substrate. And scanning the laser beam into the shorting bar to melt and round the edges of the shorting bar and the TFT substrate.

Hereinafter, a method of removing a shorting bar of a liquid crystal display panel according to the present invention will be described with reference to the accompanying drawings.

First, the liquid crystal display panel in which the shorting bar is formed will be described with reference to FIGS. 1 and 2A to 2C.

The liquid crystal display panel 101 is a TFT glass mother substrate having a TFT element, a gate line 10 connected to the TFT element, a data line 20 orthogonal to the gate line 10, and a plurality of TFT substrates on which transparent pixel electrodes are formed. The LCD unit is formed by aligning the color filter glass mother substrate formed with a plurality of color filter substrates on which electrodes, an RGB pixel, and a black matrix are formed so as to face each other accurately, and forming a cutting line 1a on the assembled substrate. (2) is formed, and the LCD unit cell (2) is cut and manufactured.

The shorting bars 12 and 22 are connected to the plurality of gate lines 10 and the plurality of data lines 20 formed on the TFT substrate 30 of the liquid crystal display panel 101 manufactured in this manner, so that all the gate lines ( 10) and data line 20 are shorted.

Reference numeral 35 is a color filter substrate.

As described above, the shorting bars 12 and 22 for shorting the gate line 10 and the data line 20 undergo a subsequent process such as attaching a polarizing plate to the liquid crystal display panel 101, injecting liquid crystal, sealing, or the like, from the operator. This is to minimize damage to the liquid crystal display panel 101 due to static electricity applied to the 101.

Such shorting bars 12 and 22 must be removed before the tape carrier package is attached to gate line 10 and data line 20.

At this time, when the shorting bar removing device is in contact with the shorting bars 12 and 22 to remove the shorting bars 12 and 22, the static electricity from the shorting bar removing device is applied to the gate line 10 or the data line 20. As a result, damage to the liquid crystal display panel 101 may occur.

Shorting bar removal device for solving this problem is cut by the laser cutter shown in Figure 3 or below.

The laser cutter 40 is composed of a laser beam output device 42, an XY table (not shown) for transporting the laser beam output device 42, and a cooling fluid supply nozzle 44 for supplying cooling fluid.

An embodiment of a method of removing a shorting bar connected to a gate line or a data line will be described with reference to FIG. 3.

First, the liquid crystal display panel 101 manufactured as shown in FIG. 2 is cut to a predetermined stage (not shown) through a process of cutting the assembled substrate 1 and the LCD unit VII shown in FIG. 1. In this case, in the liquid crystal display panel 101 loaded on the stage (not shown), the color filter substrate 35 is positioned above and the TFT substrate 30 is positioned below.

In the state where the liquid crystal display panel 101 is loaded on the stage, the laser beam emitting device 42 of the laser cutter 40 installed below the stage is transferred to the designated position of the liquid crystal display panel 101 by the XY table.

At this time, the position where the laser beam output device 42 is transferred is the shorting bar 12 and the gate line 10 or the interface between the shorting bar 22 and the data line 20, that is, the shorting bars 12 and 22 are cut off. Where to be.

As such, when the laser beam output device 42 is correctly aligned at the designated position, the high power laser beam is emitted from the laser beam output device 42 of the laser cutter 40 and the cooling fluid is injected from the cooling fluid supply nozzle 44. At the same time, the XY table (not shown) of the laser cutter 40 is moved along the designated path.

At this time, a portion of the rear surface of the TFT substrate 30 that reaches the high-power laser beam is rapidly heated to thermal expansion, and the thermally expanded TFT substrate 30 is thermally contracted by a cooling fluid to generate cracks.

This crack propagates from the rear surface of the TFT substrate 30 to the front surface of the TFT substrate 30 on which the shorting bars 12 and 22, the gate line 10, and the data line 20 are formed, thereby transferring the data line 20 or the gate. Although the shorting bars 12 and 22 are cut from the line 10, the TFT substrate 30 of the liquid crystal display panel 101 and the laser beam emitting device 42 do not directly contact each other so that static electricity is not generated.

4 to 6 illustrate embodiments of simultaneously removing edges of the liquid crystal display panel and performing edge rounding of the liquid crystal display panel according to the present invention.

In detail, the embodiment of FIG. 4 is a laser edge rounding device 50 free to move in the XY plane above a predetermined distance from the TFT substrate 30 of the liquid crystal display panel 101 loaded at a designated position of a stage (not shown). ), The edges of the TFT substrate 30 are melted together while melting the shorting bars 12 and 22 connected to the gate line 10 or the data line 20 by the laser edge rounding device 50. Perform edge rounding.

At this time, the laser edge rounding device 50 is composed of an XY table (not shown) for moving the laser beam output device 52 and the laser beam output device 52 again on the XY plane.

More specifically, after loading the liquid crystal display panel 101 at a designated position of the stage (not shown), the laser beam exiting device 52 of the laser edge rounding device 50 may be shorted with the shorting bars 12 and 22. The liquid crystal display panel 101 is accurately aligned on the edge.

Thereafter, the laser beam is emitted from the laser beam exiting device 52 of the laser edge rounding device 50 so that the edge of the TFT substrate 30 is rounded to have a predetermined curvature R while melting as shown in FIG.

Meanwhile, as shown in FIG. 6, in the process of moving the laser beam output device 52 that generates the high power laser beam while melting the edge of the TFT substrate 30, the high power laser beam is formed on the edge of the TFT substrate 30. The shorting bars 12 and 22 are located, and the shorting bars 12 and 22 are melted by the high power laser beam of the laser beam output device 52 of the laser edge rounding device 50, and at the same time, the shorting bars 12 and 22 are formed. The edge of the TFT substrate 30 located below the bottom surface) is also rounded to have a predetermined curvature while being melted by the high power laser beam.

7 to 9 illustrate another embodiment in which edge rounding of the liquid crystal display panel is simultaneously performed while removing the shorting bar of the liquid crystal display panel according to the present invention.

The shorting bars 12 and 22 described in detail above with reference to FIGS. 2 to 6 are formed together when performing a metal process for forming the gate line 10 or the data line 20, but are shown in FIG. 7. The shorting bars 60 and 70 may not be formed together when forming the gate line 10 or the data line 20, but are formed of a material having a melting point lower than that of the TFT substrate 30.

Thus, after forming the shorting bars 60 and 70 with a material having a melting point lower than that of the TFT substrate 30, the high power laser beam generated from the laser edge rounding device 50 is scanned into the shorting bars 60 and 70. As illustrated in FIG. 7, the shorting bar 60 connected to the gate line 10 or the data line 20 by peeling, burning, or melting a material having a melting point lower than that of the TFT substrate 30 may be removed from the TFT substrate 30. 70) is removed.

In order to realize this, the material used as the shorting bars 60 and 70 should be a material that absorbs the laser beam generated by the laser beam emitting device 52 while having conductivity, and the laser beam emitting device 52. The laser beam generated at) should have a wavelength band in which the wavelength of the laser beam is absorbed by the shorting bars 60 and 70.

Alternatively, as the material of the shorting bars 60 and 70, a material that transmits a laser beam while having conductivity, for example, an indium tin oxide (ITO) material used as a pixel electrode or a common electrode, is used. By selecting the wavelength band to transmit, the laser beam transmitted through ITO rapidly heats the TFT substrate 30 so that the ITO used as the shorting bars 60 and 70 can be peeled, burned, or melted from the TFT substrate 30. To be removed.

In this manner, the shorting bars 60 and 70 made of a material or ITO material having a lower melting temperature than that of the TFT substrate 30 are formed on the TFT substrate 30 as shown in FIG. 7. 20, the edges of the TFT substrate 30 are melted with a high power laser beam generated from the laser beam output device 52, and the edge rounding process is performed. 60,70 is removed in a non-contact manner to suppress the generation of static electricity and at the same time does not require a separate cleaning process after the edge rounding process.

As described in detail above, in order to prevent static electricity, by removing the shorting bars connected to the plurality of gate lines or the plurality of data lines in a non-contact manner, static electricity flows into the data lines and the gate lines from which the shorting bars are removed, thereby damaging the liquid crystal display panel. In addition to preventing wear, the edge of the liquid crystal display panel is melted while the shorting bar is removed in a non-contact manner, thereby performing edge rounding, thereby greatly suppressing the generation of glass tips and particles, thereby eliminating a separate cleaning process.

Claims (9)

A method of removing a shorting bar connected to a gate line or a data line formed to cross a front surface of a TFT substrate of a liquid crystal display panel formed by cutting an LCD unit 형성된 formed on an assembled substrate. Aligning a laser cutter spaced apart from a rear surface of the TFT substrate, the laser cutter scanning a laser beam at a cutting position at which the shorting bar is to be cut; Scanning the laser beam generated by the laser cutter to the cutting position; And cutting the TFT substrate and the shorting bar corresponding to the cutting position by supplying a cooling fluid to the cutting position. 2. The TFT substrate according to claim 1, wherein the TFT substrate is formed larger than the size of the actual TFT substrate specified corresponding to the area of the shorting bar to be cut, and the cutting position makes the size of the TFT substrate equal to the size of the actual TFT substrate. A method of removing a shorting bar of a liquid crystal display panel which is a position to be formed. A method of removing the shorting bar connected to a gate line or a data line formed to cross a TFT substrate front surface of a liquid crystal display panel formed by cutting an LCD unit 형성된 formed on an assembled substrate, and rounding an edge of the TFT substrate. Aligning a laser cutter that scans a laser beam at a position corresponding to the shorting bar so as to melt an edge of the TFT substrate positioned below the shorting bar from which the shorting bar is removed and removed from the front surface of the TFT substrate. Steps; And scanning the laser beam on the shorting bar to melt and round the edge of the shorting bar and the TFT substrate. 4. The method of claim 3, wherein the TFT substrate is the same size as the designated actual TFT substrate and the shorting bar is formed at the edge of the TFT substrate. The method of claim 4, wherein the shorting bar is formed of a material different from that of the gate line and the data line. The method of claim 5, wherein the material is lower than the melting temperature of the TFT substrate and absorbs the laser beam. The edge rounding method of claim 5, wherein the material is indium tin oxide (ITO) through which the laser beam is transmitted. The edge rounding method of claim 3, wherein the melting and rounding of the edges of the TFT substrate is performed by removing the shorting bar from the TFT substrate by the laser beam to remove the edges, and then melting the edges of the TFT substrate. . The method of claim 3, wherein the melting and rounding of the edge of the TFT substrate comprises melting the edge of the TFT substrate while melting the shorting bar by the laser beam.