KR20040078796A - Method for separating liquid crystal display panel from assembled substrate - Google Patents

Abstract

A method of separating a liquid crystal display panel from an assembled substrate is disclosed. The TFT substrate is cut from the first mother substrate of the assembled substrate to the first area, the assembled substrate is turned over, and the second mother substrate is cut into the first area along the edge of the TFT substrate to produce a first color filter substrate. A portion of the first color filter substrate again covering the signal line of the TFT substrate is cut into at least two pieces to produce a second color filter substrate, thereby producing a liquid crystal display panel composed of the TFT substrate and the second color filter substrate. This prevents damage and scratches on the signal line due to the frictional force of the glass pieces separated from the signal line of the TFT substrate by the glass pieces placed on the TFT substrate in the process of manufacturing the second color filter substrate.

Description

METHODS FOR SEPARATING LIQUID CRYSTAL DISPLAY PANEL FROM ASSEMBLED SUBSTRATE}

The present invention relates to a method of separating a liquid crystal display panel from an assembled substrate, and more particularly, to a method of cutting and separating a liquid crystal display panel from an assembled substrate without damaging a signal line to which a driving signal is input.

In general, a liquid crystal display device (LCD) is a flat display device that performs a display through a liquid crystal. The liquid crystal display performs display by controlling the liquid crystal in small area units.

The liquid crystal display device is composed of a liquid crystal display panel (LCD panel) and a light supplying device (light supplying device). The liquid crystal display panel controls the arrangement of liquid crystals in small area units, and the light supply device supplies light required for display to the liquid crystal display panel.

Recently, a plurality of liquid crystal display panels are formed together on a large glass substrate in order to maximize mass productivity, and are then cut and separated from the glass substrate.

However, such a method greatly increases the output of the liquid crystal display panel, but has a problem of generating various defects when separating the liquid crystal display panel from the glass substrate.

One cause of separation of the liquid crystal display panel from the glass substrate is damage of signal lines formed on the TFT substrate of the liquid crystal display panel. The damage of the signal line of the TFT substrate is caused by the color filter substrate having a different size from the TFT substrate.

When separating the liquid crystal display panel from the actual glass substrate, for example, in order to maximize productivity, the TFT substrate and the color filter substrate are cut to the same area, and then the part of the color filter substrate covering the signal line of the TFT substrate is cut once again. This is used.

However, after separating the liquid crystal display panel from the glass substrate using this method, a piece of glass cut and separated from the color filter substrate remains on the upper surface of the TFT substrate of the liquid crystal display panel. The glass piece is in contact with the signal line of the TFT substrate, and the glass chips generated in the process of cutting the color filter substrate are present between the glass piece and the TFT substrate. At this time, the liquid crystal display panel is conveyed by a conveyer or the like in a subsequent step in a state where a glass piece is placed on the TFT substrate. The pieces of glass placed on the TFT substrate of the liquid crystal display panel are rubbed with the TFT substrate by vibration or the like generated during the conveyance, and the glass chips disposed between the pieces of glass and the TFT substrate are rubbed with the signal lines. As the glass chip is rubbed with the signal line, a part of the signal line may be scratched or the signal line may be broken.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to separate a liquid crystal display panel from an assembled substrate which reduces a signal line applying a driving signal to the liquid crystal display panel from being damaged in the process of cutting the glass substrate. Provide a way to.

1 is a conceptual diagram showing a process for manufacturing a assembled substrate according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram conceptually illustrating a portion of the TFT substrate portion of FIG. 1.

3 is a cross-sectional view illustrating a color filter substrate.

4 is a plan view showing the relationship between the TFT substrate portion and the color filter substrate portion.

5 is a conceptual diagram illustrating a process of cutting a TFT substrate of an LCD unit cell of the assembled substrate of FIG. 1.

6 is a conceptual diagram illustrating the formation of a first color filter substrate from a second mother substrate of the assembled substrate shown in FIG. 1.

FIG. 7 is a conceptual diagram illustrating manufacturing a second color filter substrate from a first color filter substrate formed on the assembled substrate shown in FIG. 1.

In order to achieve the object of the present invention, the present invention provides a method for separating an LCD unit cell from an assembled substrate having a plurality of LCD unit cells formed on the overlapped first and second mother substrates. Forming a TFT substrate by separating the TFT substrate formed in one area, and cutting along the edge of the TFT substrate to include a color filter substrate having a second area smaller than the first area from the second mother substrate. Forming a second color filter substrate having a second area by dividing the outside of the first color filter substrate portion covering the signal lines disposed on the TFT substrate among the first color filter substrates into at least two pieces; It provides a method for separating the liquid crystal display panel from the assembled substrate comprising the step of.

According to the present invention, the separation of the liquid crystal display panel from the assembled substrate has an effect of preventing the signal lines formed on the TFT substrate of the liquid crystal display panel from being damaged.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram showing a process for manufacturing a assembled substrate according to an embodiment of the present invention.

Referring to FIG. 1, two TFT substrate parts 110 and 120 having a first area are formed in the first mother substrate 100, for example. Depending on the size of the first mother substrate 100 or the size of the TFT substrates 110 and 120, three or more TFT substrates may be simultaneously formed on the first mother substrate 100.

FIG. 2 is a conceptual diagram conceptually illustrating a portion of the TFT substrate portion of FIG. 1.

Referring to FIG. 2, the TFT substrate units 110 and 120 include a pixel electrode 130 and a thin film transistor 140.

The pixel electrode 130 is disposed in the matrix form on the TFT substrate units 110 and 120. When the resolution of the TFT substrates 110 and 120 is 1024 x 768, for example, the number of pixel electrodes 130 included in the TFT substrates 110 and 120 is 1024 x 768 x 3 pieces.

The thin film transistor 140 formed on the TFT substrates 110 and 120 includes a gate electrode G, a drain electrode D, a channel layer C, and a source electrode S. One thin film transistor 140 is connected to each pixel electrode 130. The gate line 150 is commonly connected to the gate electrodes G of the thin film transistors 140 belonging to one row of the thin film transistors 140 arranged in a matrix form, and the thin film transistors 140 arranged in a matrix form are connected to each other. The data line 160 is connected to the source electrodes S of the thin film transistors 140 belonging to one column. The drain electrode D is connected to the pixel electrode 130.

Hereinafter, the gate line 150 and the data line 160 to which the driving signal is applied from the outside will be referred to as signal lines. At the end of the signal line, a pad (not shown) is formed to apply a driving signal.

Referring to FIG. 1 again, the color filter substrates 210 and 220 are formed on the second mother substrate 200 in the same number as the TFT substrates 110 and 120 formed on the first mother substrate 100. The color filter substrate parts 210 and 220 have a second area smaller than the first area of the TFT substrate parts 110 and 120.

3 is a cross-sectional view illustrating a color filter substrate.

Referring to FIG. 3, the color filter substrates 210 and 220 include a color filter 230 and a common electrode 240. The color filter 230 is disposed at a position corresponding to each pixel electrode 130 of the TFT substrate parts 110 and 120, and the common electrode 240 covers the entire surface of the color filter substrate parts 210 and 220 so that the color filter 230 is covered. Formed over. The area of the color filter substrate portions 210 and 220 is slightly smaller than the TFT substrate portions 110 and 120 to expose the signal lines 150 and 160 of the TFT substrate portions 110 and 120 shown in FIG. 2.

4 is a plan view showing the relationship between the TFT substrate portion and the color filter substrate portion.

Referring to FIG. 4, the TFT substrate parts 110 and 120 formed on the first mother substrate 100 face the color filter substrate parts 210 and 220 formed on the second mother substrate 200. In this case, the TFT substrate parts 110 and 220 have sizes and areas of L ₁ and W ₁ , and the color filter substrate parts 210 and 220 have sizes and areas of L ₂ and W ₁ smaller than L ₁ . The edges of the color filter substrate portions 210 and 220 are aligned with the edges of the 110 and 220 of the TFT substrate.

On the other hand, in the TFT substrate units 110 and 120 formed on the first mother substrate 100 and the color filter substrate units 210 and 220 formed on the second mother substrate 200, the pixel electrodes 130 and the color filters 230 are aligned. It is sealed by the liquid crystal sealing member as much as possible. The liquid crystal is disposed between the TFT substrate portions 110 and 120 and the color filter substrate portions 210 and 220 sealed by the liquid crystal sealing member.

Referring back to FIG. 1, an assembly of a first mother substrate 100 having TFT substrates 110 and 120 and a second mother substrate 200 having color filter substrates 210 and 220 is assembled. This will be called. In addition, the TFT substrate parts 110 and 120 and the color filter substrate parts 210 and 220 which face each other in the assembled substrate 300 will be referred to as LCD unit cells 310 and 320. The LCD unit cells 310 and 320 disposed on the assembled substrate 300 are separated from the assembled substrate 300, and the liquid crystal display panel 400 is manufactured.

5 is a conceptual diagram illustrating a process of cutting a TFT substrate of an LCD unit cell of the assembled substrate of FIG. 1.

Referring to FIG. 5, the assembled substrate 300 is fixed to the base body 900 so that the TFT substrate parts 110 and 120 face upwards. The base body 900 is fixed to prevent the assembly substrate 300 from moving by vacuum pressure.

Subsequently, the scribe line is formed along the edges of the TFT substrates 110 and 120 of the first mother substrate 100 of the assembled substrate 300 by the diamond cutter 800 moving along the X and Y axes of the coordinate system shown in FIG. 5. 185,187) are formed.

Subsequently, an impact is applied to the first mother substrate 100 on which the scribe lines 185 and 187 are formed, and the crack propagates in the Z axis direction to cut the first mother substrate 100 from the scribe lines 185 and 187 by the impact. The TFT substrate parts 110 and 120 are cut from the first mother substrate 100 by cracks propagated in the Z axis direction.

Hereinafter, each TFT substrate unit 110 and 120 cut from the LCD unit cells 310 and 320 of the first mother substrate 100 will be referred to as a TFT substrate 170 and 180 (see FIG. 1).

6 is a conceptual diagram illustrating the formation of a first color filter substrate from a second mother substrate of the assembled substrate shown in FIG. 1.

Referring to FIG. 6, in a state in which the TFT substrates 170 and 180 (see FIG. 1) are separated from the first mother substrate 100, the assembled substrate 300 is turned over and then fixed to the base body 900 again. Although the TFT substrates 170 and 180 are separated from the first mother substrate 100, the assembled substrate 300 is turned over because the TFT substrates 170 and 180 are fixed to the second mother substrate 200 by the liquid crystal sealing member. Even if the TFT substrates 170 and 180 are not separated from the assembled substrate 300. Therefore, the assembly substrate 300 is fixed to the base body 900 so that the second mother substrate 200 faces upward.

With the assembled substrate 300 fixed to the base body 900, the diamond cutter 800 forms scribe lines 285 and 287 on the second mother substrate 200 again along the X and Y axes. The scribe lines 285 and 287 are formed along the edges of the TFT substrates 170 and 180 already formed on the first mother substrate 100 of the assembled substrate 300. Therefore, the inner area surrounded by the scribe lines 285 and 287 formed on the second mother substrate 200 is the same as the area of the TFT substrates 170 and 180, and at this time, the area of the TFT substrates 170 and 180 inside the scribe lines 285 and 287. Color filter substrate portions 210 and 220 having a smaller area (hatched in FIG. 6) are included. Subsequently, a weak impact is applied to the second mother substrate 200, and cracks propagate in the Z-axis direction to separate the scribe lines 285 and 287 from the second mother substrate 200 by the impact.

Hereinafter, portions separated from the second mother substrate 200 by a larger area than the color filter substrates 210 and 220 will be referred to as first color filter substrates 215 and 225.

FIG. 7 is a conceptual diagram illustrating manufacturing a second color filter substrate from a first color filter substrate formed on the assembled substrate shown in FIG. 1.

Referring to FIG. 7, at least two scribe lines are formed on the outside of the color filter substrates 210 and 220 among the first color filter substrates 215 and 225 by the diamond cutter 800 in the X-axis direction and the Y-axis direction. . In the present embodiment, the first scribe line 289 and the second scribe line 288 are preferably formed on the first color filter substrates 215 and 225.

The first scribe line 289 is formed along the uncut edges of the color filter substrate parts 210 and 220 included in the first color filter substrates 215 and 225. The second scribe line 288 is formed between the edges of the first color filter substrates 215 and 225 offset from the first scribe line 289.

The first scribe line 289 serves to expose the signal lines 150 and 160 formed on the TFT substrates 170 and 180 to the outside, and the second scribe line 288 cuts at least two pieces of glass cut on the signal lines 150 and 160. In order to be more than a piece, the signal lines 150 and 160 and the cut pieces of glass are rubbed to prevent the signal lines 150 and 160 from being damaged.

Subsequently, an impact is applied to the first scribe line 289 and the second scribe line 288 so that cracks propagate in the Z-axis direction to the first scribe line 289 and the second scribe line 288. Accordingly, portions of the first color filter substrates 215 and 225 that cover the signal lines 150 and 160 of the TFT substrates 170 and 180 are cut to produce the second color filter substrates 230 and 240.

The second color filter substrates 230 and 240 illustrated in FIG. 7 are portions in which the signal lines 150 and 160 of the TFT substrates 170 and 180 of the first color filter substrates 170 and 180 illustrated in FIG. 5 are cut off.

In this case, in the process of manufacturing the second color filter substrates 230 and 240, a crack may first propagate in the first scribe line 289 and then a crack may be formed in the second scribe line 288. A crack may be first propagated to the 288 and then a crack may be formed in the first scribe line 289.

However, it is preferable to propagate the crack to the second scribe line 288 to form the second color filter substrates 230 and 240, and then to propagate the crack to the first scribe line 289.

As described in detail above, in the process of separating the LCD unit cell from the assembled substrate on which at least one LCD unit cell is formed, the portion covering the signal line portion of the TFT substrate is separated into at least two pieces and separated from the assembled substrate. While the liquid crystal display panel is being transported, the friction between the glass pieces and the signal lines placed on the TFT substrate is greatly reduced to prevent damage to the signal lines.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (4)

In the method of separating the LCD unit cell from the assembled substrate having a plurality of LCD unit cells formed on the overlapping first mother substrate and the second mother substrate, Separating the TFT substrate formed from the first mother substrate into a first area to form a TFT substrate; Forming a first color filter substrate by cutting along an edge of the TFT substrate such that a color filter substrate portion having a second area smaller than the first area is included from the second mother substrate; And Forming a second color filter substrate having the second area by dividing an outer side of the first color filter substrate portion of the first color filter substrate covering the signal line disposed on the TFT substrate into at least two pieces; And separating the liquid crystal display panel from the assembled substrate. The method of claim 1, wherein the forming of the second color filter substrate is performed. Forming a first scribe line along an edge of the color filter substrate to separate a portion of the first color filter substrate covering the signal line; Forming at least one second scribe line out of the first scribe line; And And propagating cracks in the second scribe line and the first scribe line. 3. The method of claim 2, wherein propagating the cracks comprises propagating the cracks on the second scribe line; And And propagating the cracks to the first scribe line. 3. The method of claim 2, wherein propagating the cracks comprises propagating cracks in the first scribe line; And And propagating the cracks to the second scribe line.