KR100960453B1 - Liquid crystal display - Google Patents

Abstract

The present invention relates to a liquid crystal panel, wherein the liquid crystal panel according to the present invention comprises a first substrate and a second substrate bonded to each other and a plurality of gate lines and data lines arranged vertically and horizontally on the first substrate. A plurality of pad portions formed on the first substrate, a plurality of output lines formed on the pad portion and connected to gate lines and data lines of the first substrate, and cut lines are formed to electrically insulate each other; It is formed on at least one side of the output line, and comprises a first graduation pattern formed of a predetermined graduation unit, and a second graduation pattern formed in the arrangement direction of the output line, the graduation pattern formed on one side or both sides of the output line The position and width of the cutting line can be measured, and the cutting start position of the laser cutting can be measured by the graduation pattern formed in the arrangement direction of the output line.

Description

LCD panel {LIQUID CRYSTAL DISPLAY}

1 is a plan view showing a unit liquid crystal panel separated by a separation process.

FIG. 2 is a partially enlarged view of FIG. 1 showing a pad part on which an output line is formed; FIG.

Figure 3 is a plan view showing the output lines of the laser cut pad portion.

Figure 4a is a view showing a graduation pattern formed in the pad portion.

Figure 4b is a view showing one pad portion laser cut.

Figure 4c is a view showing a plurality of pad portion laser cut.

Figure 4d is a view showing a gate pad portion formed with an output line and a graduation pattern cut by laser cutting.

Fig. 4E is a view showing a plurality of gate pad portions cut by laser cutting.

Figure 5a is a view showing a pad portion formed with a graduation pattern according to a second embodiment of the present invention.

Figure 5b is a view showing a pad portion formed with an output line and a graduation pattern cut by laser cutting.

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

125A: Even output line 125B: Even output line

140: shorting bar 150: graduation pattern                 

PAD11: Pad portion P1: Unit scale

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel. More particularly, the present invention relates to a liquid crystal panel in which a graduation pattern is formed on the liquid crystal panel to easily grasp the processing state of the processed liquid crystal panel by laser trimming. It is about.

In general, a liquid crystal display includes a liquid crystal panel including a thin film transistor array substrate and a color filter substrate bonded together to face each other, and a liquid crystal layer formed between the two substrates, and supplying scan signals and image information to the liquid crystal panel. And a driving unit for operating the liquid crystal panel.

In the thin film transistor array substrate, a plurality of gate lines that are regularly spaced apart laterally and a plurality of data lines that are regularly spaced apart vertically intersect with each other, wherein the gate lines and the data lines are partitioned by an intersection. Pixels are defined in the area. Each pixel is individually provided with a switching element electrically connected to the gate lines and the data lines, and operates according to a scan signal of the driving unit to apply image information to the pixels.

Red, green, and blue color filter layers are formed at positions corresponding to the pixels on the color filter substrate, and color interference of light passing through the pixels is prevented between the color filter layers and in an image non-display area. In order to prevent leakage, a black matrix is formed.

The liquid crystal display device as described above is manufactured in a mother substrate unit in which a plurality of liquid crystal panels are formed. That is, thin film transistor array substrates are formed on a mother substrate, color filter substrates are formed on a separate mother substrate, and two mother substrates are bonded to each other. Since the bonded mother substrate is separated to form a plurality of unit liquid crystal panels, the yield is improved.

In general, the liquid crystal panel is separated by a wheel having a hardness higher than that of the glass constituting the mother substrate, forming a groove to be cut on the surface of the mother substrate, and applying external force to the mother substrate along the cut groove to crack each unit liquid crystal panel. By doing so.

Hereinafter, the liquid crystal panel cut from the mother substrate will be described in detail with reference to the accompanying drawings.

1 is a plan view showing a unit liquid crystal panel separated by a separation process.

Referring to FIG. 1, a matrix of a plurality of gate lines 30 that are uniformly spaced apart laterally and arranged on the thin film transistor array substrate 11 is arranged in a matrix. The image display unit 13 is provided in an area where the data lines 20 and the gate lines 30 cross each other.

In general, the thin film transistor array substrate 11 has a larger area than the color filter substrate 12. Therefore, when the two substrates 11 and 12 are bonded together, a portion of the thin film transistor array substrate 11 is exposed to the outside, and this region is called a pad region. The pad area includes a plurality of pad parts PAD_G and a pad part PAD_D, and the pad part PAD_G and the pad part PAD_D each have a gate driver integrated circuit (Gate IC) and A data driver integrated circuit (data IC) is implemented. In general, the gate IC and the data IC are collectively referred to as a driving IC.

The pad region includes a plurality of input lines 24 for applying external data to the gate IC and the data IC, and output signals of the gate IC and the data IC to the gate lines 30 in the image display unit 13. And a plurality of output lines 25 for transferring to the data lines 20. The pad IC PAD_G and the pad PAD_D are separately provided with a driving IC.

In general, there are various methods of connecting the driving unit and the liquid crystal panel, but nowadays, a tape carrier package (TCP) method and a chip-on-glass (COG) method are mainly used. The TCP method is a method of mounting a driving IC on a thin flexible film made of a polymer material and connecting the flexible film with a liquid crystal panel to connect the driving device to the liquid crystal panel. It is a method of connecting directly mounted on the glass substrate of the liquid crystal panel. Among the TCP method and the COG method, the COG method mounts the driving IC directly on the glass substrate, so that a liquid crystal panel can be manufactured in a compact manner.

The liquid crystal panel shown in the drawing is a liquid crystal panel of the COG method. In this case, the driving IC is not mounted on the pads PAD_G and PAD_D. When the driving IC is mounted, a signal is input from the outside through the input line 24 to the driving IC, and an output signal of the driving IC is applied to the gate line and the data line through the output line 25.

The output lines 25 formed in the pads PAD_G and PAD_D are electrically connected to each other. As such, by electrically connecting the output lines 25, the static electricity generated during the process may be distributed and mitigated into a plurality of lines, and a signal is applied to one output line during an operation test, so that all the output lines are electrically connected. You can check them.

FIG. 2 is a partially enlarged view of FIG. 1 and illustrates a pad part in which an output line is formed.

Referring to FIG. 2, the pad part PAD1 includes a plurality of output lines 25 including a plurality of odd-numbered output lines 25A and a plurality of even-numbered output lines 25B, and odd numbers of the output lines 25. And a shorting bar 40 electrically connecting the first output lines 25A and the even output lines 25B, respectively.

As described above, the output line 25 is divided into an odd-numbered output line 25A and an even-numbered output line 25B in order to efficiently inspect defective driving of pixels. The entire output line 25 may be electrically connected.

Meanwhile, a driving IC is mounted on the unit liquid crystal panel cut from the mother substrate. A plurality of input lines (not shown) formed in the pad part PAD1 and a plurality of input pins provided in the driving IC correspond one-to-one, and a plurality of outputs are provided. The line 25 and the plurality of output pins of the driving IC are also mounted to correspond one-to-one. That is, external data is applied to the driving IC through the input pin at the input line, and output data of the driving IC is applied to the output line through the output pin. Therefore, in order to apply an individual output signal to each output line 25, the output lines 25 electrically connected by the shorting bar 40 must be disconnected. Disconnection is mainly performed by a laser, and disconnection by a laser is called laser trimming.

3 is a plan view showing output lines of a laser cut pad portion.

Referring to FIG. 3, a plurality of output lines 25 including odd-numbered output lines 25A and even-numbered output lines 25B on a pad portion, arranged at regular intervals, and the odd-numbered output lines ( There is a shorting bar 40 that electrically connects 25A) and even-numbered output lines 25B, respectively. As shown in the figure, the odd-numbered output line 25A and the even-numbered output line 25B are disconnected to a certain width by laser cutting.

On the other hand, the position of the laser cutting region depends on the size of the driving IC to be mounted in the pad portion. That is, the distance H1 from the shorting bar 40 to the cutting area is determined according to the size of the driving IC. In addition, in order for the input pin and the output pin of the driving IC to be connected to the input line and the output line 25 of the pad part PAD1 in one-to-one correspondence, each output line should be cut at the same position to match the arrangement of the cutting lines. .

After cutting the laser, check the alignment of the cutting lines. If the cutting position of each output line is different, when the driving IC is mounted, the output pins of the driving IC and the output lines are not exactly connected one-to-one. Should be inspected for defects. In the prior art, only a defect in the state of cutting line arrangement is simply checked through a microscope, and when the photograph taken through the microscope is transmitted to a computer, the computer determines the defect by measuring the width of the cutting line and the deviation of the arrangement state. . However, such conventional laser cutting defect inspection requires not only various steps such as photographing with a microscope, transferring pictures and processing data with a computer, but also requires equipment such as a microscope or a computer, thereby increasing inspection cost. There was a problem.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to laser cut the output lines electrically connected by a shorting bar on the unit liquid crystal panel, the width of the laser cut cutting line and SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal panel having a graduation pattern for easily measuring an arrangement state and inspecting defects of laser cutting.

As described above, the liquid crystal panel for achieving the object of the present invention comprises a first substrate and a second substrate bonded to each other and a plurality of gate lines and data lines arranged vertically and horizontally spaced apart on the first substrate. A plurality of pad portions formed on the first substrate, a plurality of output lines formed on the pad portion and connected to gate lines and data lines of the first substrate, and cut lines are formed to electrically insulate each other; It is formed on at least one side of the output line, and comprises a first graduation pattern formed of a predetermined graduation unit, and a second graduation pattern formed in the arrangement direction of the output line.                     

Referring to the attached liquid crystal panel according to the present invention as described above in detail as follows.

4A to 4E are views illustrating pad portions of the liquid crystal panel according to the first embodiment of the present invention.

Although the liquid crystal panel is substantially composed of a thin film transistor array substrate and a color filter substrate, the present invention is characterized in that the connection line and the cutting state of the output line and the shorting bar formed in the pad part are only shown in detail below. Other structures will be omitted.

4A is a diagram illustrating a graduation pattern formed on a pad part.

Referring to FIG. 4A, the pad portion PAD11 of the liquid crystal panel includes a plurality of output lines 125 including a plurality of odd-numbered output lines 125A and a plurality of even-numbered output lines 125B, and the odd-numbered output lines. A shorting bar 140 electrically connecting the 125A and even-numbered output lines 125B, respectively, and formed on at least one side of the pad part PAD11 (formed on both sides in the drawing), and having a predetermined scale unit P1. It consists of a grid pattern 150 to make the length of the output line (125A, 125B) with the naked eye.

In the inspection-ended liquid crystal panel, the odd-numbered output line 125A and the even-numbered output line 125B of the pad portion PAD11 are disconnected, and the driving IC is mounted in the disconnected region. In this case, since the output pin of the mounted driving IC and the output line 125 correspond to one-to-one, the output signal of the driving IC may be applied to the output line 125 separately.                     

On the other hand, the side of the output line 125 is formed with a graduation pattern 150 having a graduation of a predetermined interval can measure the cutting area of the output line 125.

The graduation pattern 150 is formed during the process of forming the input line and the output line of the pad part in the manufacturing process of the liquid crystal panel. That is, the gate line and the data line are formed together on the liquid crystal panel. Therefore, a separate process for forming the graduation pattern 150 is not required.

The unit scale P1 of the scale pattern 150 is determined according to the diameter of the laser beam during the laser cutting, that is, the width of the cutting line cut by the laser cutting. At this time, the unit division (P1) should be set to less than the width of the cutting line to have a discriminating power when measuring the cutting area.

According to the present invention, the graduation pattern formed in the pad part is inspected in the unit liquid crystal panel after the output line is disconnected by laser cutting, and then inspects the cutting region, thereby determining a defect and correcting the laser cutting process. By using the graduation pattern, it is possible to measure whether or not the position of the cutting line in the pad part is equal, and whether the cutting line is cut to a constant width.

FIG. 4B is a diagram showing one pad portion laser cut, and FIG. 4C is a diagram showing a plurality of pad portions laser cut.

The position and width of the cutting line of the output lines 125A and 125B formed in the pad part PAD11 may be measured by the graduation pattern 150. That is, it can be measured visually by the scale of the scale pattern 150. As shown in Fig. 4B, when the position of the cutting line on the left side of the pad portion and the position of the cutting line on the right side are not the same, the arrangement deviation DELTA MW1 can be measured by the scale pattern 150. In addition, the difference between the width DELTA M1 of the left cut line and the width DELTA M2 of the right cut line can be measured.

On the other hand, the arrangement deviation of the cutting line positions between the plurality of pad portions PAD11 and PAD12 can be measured. As shown in Fig. 4C, when the position of the cut line of the left pad portion and the position of the cut line of the right pad portion are different from each other, the arrangement deviation of the cut line positions of the left pad portion and the right pad portion by the scale pattern 150 ( ΔMW11) can be measured.

The pad parts PAD11 and PAD12 on which the graduation patterns 150 are formed are related to the data pad part, and the graduation patterns 151 may be formed in the gate pad part in the same manner.

FIG. 4D is a view illustrating a gate pad portion in which an output line and a scale pattern are cut by laser cutting, and FIG. 4E is a view of a plurality of gate pad portions cut by laser cutting.

Referring to the drawings, the liquid crystal panel is formed on a plurality of output lines 126, a shorting bar that electrically connects the output lines, and at least one side (formed on both sides of the drawing) of the pad portion PAD20, and has a constant scale. Comprising a unit (P1) is configured to include a graduation pattern 150 to enable the naked eye to measure the length of the output line 126.

The grid pattern 151 is formed in parallel with the output line 126 to accurately measure the length of the output line 126. The graduation pattern 151 is formed above or below the output line 126.

The output line 126 is electrically connected to all the lines by the shorting bar. The odd-numbered output lines and the even-numbered output lines may be separated and connected to each other in the same way as the data pad part. However, since the number of output lines of the gate pad part is smaller than the number of output lines of the data pad part, the total number of output lines may be distributed when the static electricity is generated. The number of output lines can be secured enough.

On the other hand, the position and width of the cutting line laser cut by the graduation pattern 151 can be measured. That is, as shown in the drawing, when the positions of the cutting lines are different, the arrangement deviation ΔMW2 may be measured by the graduation pattern 151. In addition, when the width ΔM3 of the upper cutting line and the width ΔM4 of the lower cutting line are different, the deviation of the widths of the cutting lines may be obtained by the scale of the scale pattern 151. And, as shown in Figure 4e, when the position of the cutting line of the output line is not the same in the plurality of gate pad portion (PAD20, PAD21), the arrangement deviation of the position of the cutting line by the scale of the scale pattern 151 (ΔMW12) can be measured.

Although the graduation patterns 150 and 151 as described above may be formed in parallel with the output line, the graduation patterns 150 and 151 may be formed in parallel with the shorting bar to measure the start position of the laser cutting.

Figure 5a is a view showing a pad portion formed with a graduation pattern according to a second embodiment of the present invention, Figure 5b is a view showing a pad portion formed with an output line and a graduation pattern cut by laser cutting.

Referring to the drawings, the pad part PAD31 includes a plurality of output lines 225 including a plurality of odd-numbered output lines 225A and a plurality of even-numbered output lines 225B, the odd-numbered output lines 225A, and The shorting bar 240 electrically connecting the even-numbered output lines 225B, respectively, and formed on one side of the shorting bar 240, and are formed in a predetermined scale unit so as to measure the position of the cutting line with the naked eye. And 250.

The graduation pattern 250 is formed in parallel with the shorting bar 240. As such, the graduation pattern 250 is formed on one side of the shorting bar 240 in order to measure the exact position at which the cutting starts when the laser is cut.

The output line 225 is disconnected to separately apply signals to the output lines 225 formed on the unit liquid crystal panel. Therefore, it is important to accurately disconnect all the output lines 225 during laser cutting. However, laser cutting may be performed while the cutting start position is shifted so that some output lines 225 remain electrically connected. At this time, the deviation of the cutting start position should be measured and corrected accordingly.

As shown in the figure, when the cutting start position of the laser cutting has a deviation (△ MW31) by a predetermined distance from the set position (S11), the graduation of the graduation pattern 250 formed on the upper portion of the shorting bar 240 Accurate deviations can be measured. In other words, the output lines are formed parallel to the shorting bar in the direction in which the output lines are arranged, and at least the output lines must be formed at least in the arranged width.

The graduation pattern 250 formed on one side of the shorting bar 240 may be formed simultaneously with the graduation pattern formed on at least one side of the output line. That is, by simultaneously forming two graduation patterns, the position and width of the cutting line and the starting position of the cutting line can be performed by one visual inspection.                     

As described above, the inspection of the laser cutting line is conventionally performed by the inspection process having several stages. In the present invention, the position and the width of the cutting line of the output line can be inspected by the graduation pattern having a predetermined interval. do. At this time, the graduation interval of the graduation pattern can be arbitrarily applied as needed. For example, it can apply according to the magnitude | size of a laser beam. Of course, the size of the scale will be a very small size set below the size of the laser beam. But. By enlarging using a microscope, the position and width of a cutting line can be measured easily by the said graduation pattern.

As described above, the position and width of the cutting line are measured by the graduation pattern formed on one or both sides of the output line according to the first embodiment of the present invention, and the scale formed in the arrangement direction of the output line according to the second embodiment. By measuring the cutting start position of the laser cutting by the pattern, it is possible to inspect and correct a defective process in manufacturing the liquid crystal display device, thereby producing a good quality liquid crystal display device.

Claims (10)

A first substrate and a second substrate bonded to each other; A plurality of gate lines and data lines arranged vertically and horizontally on the first substrate; A plurality of pad parts formed on the first substrate; A plurality of output lines formed on the pad part and connected to the gate line and the data line of the first substrate and having cut lines formed therein, and electrically insulated from each other; It is formed on at least one side of the output line, the liquid crystal panel characterized in that it comprises a first graduation pattern made of a predetermined graduation unit. The liquid crystal panel of claim 1, wherein the first scale pattern is parallel to the output line. The liquid crystal panel according to claim 1, wherein the first graduation pattern makes it possible to measure the position and width of the cutting line under a microscope. The liquid crystal panel according to claim 1, wherein the cutting line is cut by laser cutting. The liquid crystal panel according to claim 1, wherein the division unit of the first division pattern is set to a width of a cutting line or less. The liquid crystal panel according to claim 1, further comprising a second graduation pattern formed in an arrangement direction of the output line and having a predetermined scale unit. 7. The liquid crystal panel according to claim 6, wherein the second scale pattern enables the naked eye to measure the cutting start position by the scale unit. The liquid crystal panel of claim 1 or 6, wherein the first division pattern and the second division pattern are simultaneously formed when the data line or the gate line is formed. A first substrate and a second substrate bonded to each other; A plurality of gate lines and data lines arranged vertically and horizontally on the first substrate; A plurality of pad parts formed on the first substrate; A plurality of output lines formed on the pad part and connected to the gate line and the data line of the first substrate and having cut lines formed therein, and electrically insulated from each other; And a second graduation pattern formed in an arrangement direction of the output line and configured to have a predetermined scale unit to measure a cutting start position of the cutting line under a microscope. 10. The liquid crystal panel according to claim 9, wherein the cutting line is cut by laser cutting.

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