KR20110067229A - Substrate for liquid crystal display device and liquid crystal display device using the same and method for manufacturing liquid crystal display device - Google Patents

Abstract

PURPOSE: A substrate of a liquid crystal display device and a method for manufacturing the same are provided to perform lightening test with the minimized number of turning on test pads. CONSTITUTION: A substrate of a liquid crystal display device comprises a substrate in which an active area, a pad area, and a cutting area are included, a plurality of lines which are formed on the active area, a turning on test pad(110) formed on the active area, and a connection bar(120) which is formed on the cutting area. The lines are connected with the connection bar and the connection bar is connected to the turning on test pads.

Description

Substrate for Liquid Crystal Display Device and Liquid Crystal Display Device using the same and method for manufacturing Liquid Crystal Display Device}

The present invention relates to a liquid crystal display device, and more particularly to a lighting test of the liquid crystal display device.

Liquid crystal display devices have a wide range of applications ranging from notebook computers, monitors, spacecrafts, aircrafts, etc. to the advantages of low power consumption and low power consumption.

The liquid crystal display device includes a first substrate, a second substrate, and a liquid crystal layer formed between the two substrates, and the arrangement of the liquid crystal layers is adjusted according to whether an electric field is applied, and accordingly, light transmittance is adjusted to display an image. Device.

In such a liquid crystal display device, a pixel electrode is formed on a first substrate and a common electrode is formed on a second substrate to adjust the arrangement of the liquid crystal layer through a vertical electric field between the pixel electrode and the common electrode. The pixel electrode and the common electrode may be formed together on the first substrate to adjust the arrangement of the liquid crystal layer through a horizontal electric field between the pixel electrode and the common electrode.

In the liquid crystal display device for adjusting the arrangement of the liquid crystal layer through the horizontal electric field, a thin film transistor, a pixel electrode, and a common electrode are formed on a first substrate, and a light shielding layer and a color filter layer are formed on a second substrate. And forming a liquid crystal layer between the first substrate and the second substrate to complete the liquid crystal cell, and then, through the module process of bonding a backlight or the like to the liquid crystal cell, the finished product is manufactured.

Meanwhile, a test process for various defects is performed on the liquid crystal display, and in some cases, the test process is performed during the manufacturing process of the liquid crystal display. The reason why the test process is performed during the manufacturing process is to prevent unnecessary additional process for defective products.

Among the test processes performed during the manufacturing process, there is a lighting test process for the first substrate on which the thin film transistor, the pixel electrode, and the common electrode are formed.

In general, in order to apply a signal to the thin film transistor, the pixel electrode, and the common electrode, a gate wiring, a data wiring, and a common wiring are formed on the first substrate. When the lighting test is performed through each of these wirings, As a result, it is possible to prevent unnecessary additional processes for defective products.

Hereinafter, a lighting test method for a conventional liquid crystal display substrate will be described with reference to the drawings.

1 is a schematic layout of a conventional liquid crystal display substrate.

As shown in FIG. 1, the substrate 1 includes an active area (A / A) and a pad area (P / A).

A plurality of gate lines, data lines, and common lines are formed in the active area A / A, and a thin film transistor, a pixel electrode, and a common electrode connected to the lines are formed in each pixel area.

In the pad region P / A, a driver D-IC is provided to apply a signal to the respective wires, and a lighting test pad 10 is formed.

The lighting test pad 10 formed in the pad area P / A is directly connected to the respective wirings formed in the active area A / A. ) Is formed. For example, a lighting test pad 10 for applying a signal to the gate wiring is formed, a lighting test pad 10 for applying a signal to the data wiring is formed, and a lighting test for applying a signal to the common wiring. The pad 10 is formed. In addition, in the case of data wiring, there are a plurality of data wires to which a red (R) data signal is applied, a plurality of data wires to which a green (R) data signal is applied, and a plurality of data wires to which a blue (B) data signal is applied. In addition, individual lighting test pads 10 may be configured to apply signals to data lines for respective colors.

As such, a plurality of lighting test pads 10 should be formed for the lighting test. However, when the number of the lighting test pads 10 increases depending on the application, there may occur a case in which the necessary lighting test pads 10 cannot be formed due to insufficient space in the pad area P / A. For example, in the case where driving is required by dividing the common wiring into pieces, when the lighting test pad 10 is formed for each common wiring, there may be insufficient space in the pad region P / A.

In order to solve this problem, the pad area P / A may be large, but when the pad area P / A is large, the number of liquid crystal cells that can be obtained on a large-area substrate may be reduced. In production, the economy becomes inferior.

The present invention has been devised to solve the above-mentioned conventional problems, and the present invention provides a liquid crystal that does not need to form a large pad area (P / A) by enabling a necessary lighting test to be performed while minimizing the number of lighting test pads. It is an object to provide a substrate for a display device.

Another object of the present invention is to provide a liquid crystal display device using the substrate for a liquid crystal display device and a method of manufacturing the same.

In order to achieve the above object, the present invention provides a substrate comprising an active area for displaying an image, a pad area in which a pad is formed, and a cutting area cut in a liquid crystal cell process; A plurality of wirings formed in the active region; A lighting test pad formed in the pad area; And a connection bar formed in the cutting area, wherein each of the wires is connected to the connection bar, and the connection bar is connected to the lighting test pad.

The present invention also includes a first substrate comprising an active area for displaying an image and a pad area in which a pad is formed; A second substrate facing the first substrate; A liquid crystal layer formed between the first substrate and the second substrate; Interconnections formed in an active region of the first substrate; And a lighting test pad formed in the pad region of the first substrate, wherein the lighting test pad is connected with a first connection line, and the wirings are connected with a second connection line. To provide.

The present invention also provides a process for preparing a first substrate; Preparing a second substrate; Bonding both substrates together while forming a liquid crystal layer between the first substrate and the second substrate; And cutting the bonded first and second substrates into a liquid crystal cell, wherein the preparing of the first substrate comprises: forming wirings in an active region; Forming a lighting test pad in the pad area; And forming a connection bar connected to each of the wires in the cutout area and connected to the lighting test pads.

According to the present invention as described above has the following effects.

According to the present invention, by connecting the connection bar formed in the cutting area by tying up wires capable of simultaneously performing the lighting test, and connecting the connection bar with the lighting test pad formed in the pad area, the number of lighting test pads can be minimized. As a result, it is not necessary to increase the size of the pad area so that a maximum liquid crystal cell can be formed on a large area substrate.

In addition, when driving the liquid crystal display device separately from the lighting test, since different driving signals are applied to each of the plurality of wires, the liquid crystal display device, which is a finished product, must release the electrical connection state between the plurality of wires. According to the invention, since the connection bar is formed in the cutting region removed through the scribing process, the electrical connection state between the plurality of wires can be released through the scribing process, There is an advantage that does not require a separate process for releasing the electrical connection state.

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

FIG. 2 is a schematic layout of a liquid crystal display substrate according to an embodiment of the present invention, and FIG. 3 is a schematic plan view showing a configuration in an active area of the liquid crystal display substrate according to an embodiment of the present invention.

As can be seen in FIG. 2, the liquid crystal display substrate 100 according to an embodiment of the present invention includes an active area (A / A), a pad area (P / A), and a cutting area. (Cutting Area: C / A).

The active area A / A is an area for displaying an image, and in the active area A / A, a gate wiring, a data wiring, a common wiring, a thin film transistor, a pixel electrode, and a common electrode are formed.

Referring to the configuration of the active region A / A in more detail, as shown in FIG. 3, the gate wiring 101 and the data wiring 102 are formed on the substrate 100 so as to cross each other to define pixel regions. The thin film transistor T is formed in an area where the gate wiring 101 and the data wiring 102 cross each other.

In addition, the pixel electrode 103 and the common electrode 105 are alternately arranged in parallel in the pixel area, and the pixel electrode 103 is electrically connected to the thin film transistor T, and the common The electrode 105 is electrically connected to the common wiring 104 formed in a predetermined direction.

Therefore, when a gate voltage and a data voltage are respectively applied to the gate wiring 101 and the data wiring 102, the thin film transistor T is driven to apply a voltage to the pixel electrode 103, and the common wiring ( When a common voltage is applied to 104, a voltage is applied to the common electrode 105 to form a horizontal electric field formed by the voltage difference between the pixel electrode 103 and the common electrode 105. The arrangement of the layers is controlled.

3 is a so-called IPS (In-Plane Switching) mode, the liquid crystal display according to the present invention is not necessarily limited to the IPS mode, various modifications such as TN (Twisted Nematic) mode, VA (Vertical Alignment) mode In addition, the IPS mode may also be modified in various forms known in the art.

Referring to FIG. 2 again, the pad area P / A is an area outside the active area A / A. The pad area P / A includes a driving unit D-IC and a lighting test pad. 110 is formed.

The driver D-IC is connected to various wires formed in the active area A / A to apply a specific signal to the wires, and the driver D-IC applies a gate voltage to the gate wires. The gate driver may be applied, the data driver is configured to apply a data voltage to the data line, or the common driver is configured to apply a common voltage to the common line. The driving unit D-IC may be configured as a chip on glass (COG) mounted on the substrate 100.

The lighting test pad 110 is used to perform a lighting test by applying a signal to the gate wiring, the data wiring, or the common wiring, and is formed in an appropriate number according to the characteristics and uses of the wirings. Also, when a plurality of lighting test pads 110 are applied, each lighting test pad 110 may be formed at both sides of the driving unit D-IC as shown, but is not limited thereto. May be disposed at an appropriate position in the P / A).

The cutting area C / A is an area that is positioned outside the pad area P / A and is cut in the liquid crystal cell manufacturing process. That is, the cutting region C / A is present in the substrate manufacturing process, but is cut through the scribing process along the scribing line S during the liquid crystal cell manufacturing process and is not present in the finished liquid crystal display device. to be.

The connection bar 120 is formed in the cutting area C / A. The connection bar 120 serves to connect the wires, for example, the gate wire, the data wire, or the common wires to the lighting test pad 110. That is, the present invention is characterized in that after connecting the wiring to perform the lighting test at the same time and connected to the connection bar 120, the connection bar 120 is connected to the lighting test pad 110, Through such a configuration, it is possible to minimize the number of the lighting test pads 110, thereby eliminating the need to increase the size of the pad area P / A. It can be formed.

The wires connected to the connection bar 120 are wires capable of simultaneously performing a lighting test, and may be a plurality of gate wires, a plurality of data wires, or a plurality of common wires. In addition, although only one connection bar 120 is illustrated, a plurality of connection bars 120 may be formed.

The connection bar 120 formed in the cutting area C / A and the lighting test pad 110 formed in the pad area P / A may be electrically connected to each other through the first connection line 130. As such, since only the first connection line 130 is connected to the lighting test pad 110, the connection structure is simpler than the conventional method of directly connecting a plurality of wires to the lighting test pad 110.

The connection bar 120 formed in the cutting area C / A and the plurality of wires formed in the active area A / A may be electrically connected to each other through separate second connection lines 140. In this case, each of the plurality of second connection lines 140 is connected to the connection bar 120 through an appropriate path without being connected to each other.

Since a simultaneous lighting signal is applied to the plurality of wires through the plurality of second connection lines 140, only the plurality of second connection lines 140 are connected to the connection bar 120 in a state in which the plurality of second connection lines 140 are connected to each other. May be connected. However, the plurality of wires should not be electrically connected to each other because a simultaneous lighting signal is applied during the lighting test, but a separate signal should be applied during the actual driving of the liquid crystal display. For this reason, it is preferable that the plurality of second connection lines 140 are individually connected to the connection bars 120 without being connected to each other.

In addition, although the plurality of second connecting lines 140 are electrically connected through the connecting bar 120 even though they are not connected to each other, the cutting area C / A is cut after the lighting test. Therefore, after such a cutting process, the electrical connection between the plurality of second connection lines 140 may be released.

Meanwhile, when forming the plurality of wires, the connection bar 120, the first connection line 130, and the second connection line 140 may be formed together. That is, the plurality of wires, the first connection line 130, the connection bar 120, and the second connection line 140 may be formed on the same layer by the same material by being integrally formed at the same time.

The substrate 100 for a liquid crystal display device according to an exemplary embodiment of the present invention connects a plurality of wires to the connection bar 120 through individual second connection lines 140, and connects the connection bar 120 to the first bar. When the lighting signal is applied through the lighting test pad 110 by connecting to the lighting test pad 110 through a connection line 130, the lighting signal may be simultaneously applied to a plurality of wires to perform the lighting test. .

In addition, as described above, when driving the liquid crystal display device separately from the lighting test, different driving signals are applied to each of the plurality of wires. According to the present invention, the entirety of the connection bar 120 and the first connection line 130 and a part of the second connection line 140 are removed through a scribing process which is a liquid crystal cell manufacturing process. C / A), the electrical connection state between the plurality of wires can be released through the scribing process, so that a separate process for releasing the electrical connection state between the plurality of wires is not required. There are advantages.

4 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention, and FIG. 5 is a schematic layout of a substrate for a liquid crystal display device according to an embodiment of the present invention.

As can be seen in FIG. 4, the liquid crystal display according to the exemplary embodiment of the present invention includes a first substrate 100, a second substrate 200, a liquid crystal layer 300, and a seal member 400. .

A gate wiring, a data wiring, a common wiring, a thin film transistor, a pixel electrode, and a common electrode may be formed on the first substrate 100.

A light blocking layer may be formed on the second substrate 200 to prevent light from leaking, a color filter layer formed between the light blocking layers to implement color, and an overcoat layer for planarizing the substrate.

The liquid crystal layer 300 is formed between the first substrate 100 and the second substrate 200 to adjust the light transmittance.

The seal member 400 is formed between the first substrate 100 and the second substrate 200 to bond the two substrates 100 and 200.

In general, the size of the first substrate 100 is larger than the size of the second substrate 200. The reason is that a plurality of wires are formed in the active region A / A on the first substrate 100. This is because the pad area P / A is additionally required to receive the driving signal from the driver.

The first substrate 100 may be configured as shown in FIG. 5. Specifically, the substrate 100 according to FIGS. 2 and 3 may be applied to the first substrate 100 applied to the liquid crystal display according to the present invention. However, although the cutting region C / A exists in the substrate 100 of FIG. 2 and FIG. 3, the first substrate 100 applied to the liquid crystal display device as a finished product is as shown in FIG. 5. Only the active region A / A and the pad region P / A exist, and the cut region C / A does not exist.

Thus, as shown in FIG. 5, the first substrate 100 applied to the liquid crystal display according to the present invention includes an active area A / A and a pad area P / A, and the pad The driver D-IC and the lighting test pad 110 are formed in the region P / A.

The first connection line 130 and the plurality of second connection lines 140 are formed in the pad region P / A. One end of the first connection line 130 is connected to the lighting test pad 110, and the other end of the first connection line 130 extends to one side (scribing line S) of the first substrate 100. have. One end of the plurality of second connection lines 140 is individually connected to a plurality of wires of the active area A / A, and the other end of the second connection line 140 is similar to the first connection line 130. It extends to one side (scribing line S) of the first substrate 100.

The first connection line 130 and the plurality of second connection lines 140 are not connected to each other, and each of the plurality of second connection lines 140 is also not connected to each other.

6A to 6D are schematic process perspective views illustrating a manufacturing process of a liquid crystal display according to an exemplary embodiment of the present invention.

First, as shown in FIG. 6A, a first substrate 100 and a second substrate 200 are prepared.

The first substrate 100 is the same as shown in FIGS. 2 and 3. That is, the process of preparing the first substrate 100 may include forming wirings in an active region, forming a lighting test pad in a pad region, and connecting each of the wirings in a cutting region and the lighting test pad. Forming a connection bar connected with the; Since the detailed configuration thereof is the same as described above, repeated description will be omitted.

As described above, the second substrate 200 may be prepared by sequentially forming a light blocking layer, a color filter layer, and an overcoat layer.

Next, as shown in FIG. 6B, both substrates 100 and 200 are bonded to each other while forming a liquid crystal layer between the first substrate 100 and the second substrate 200.

In the process, a seal material having a predetermined injection hole is coated on one of the first and second substrates 100 and 200, and the first and second substrates 100 and 200 are applied. After bonding, injecting the liquid crystal through the injection hole of the seal material, it may include a step of sealing the injection hole of the seal material.

Alternatively, in the above process, a seal material having no injection hole is coated on one of the first substrate 100 and the second substrate 200, and any one of the first substrate 100 and the second substrate 200 is applied. And dropping the liquid crystal onto the substrate of the first substrate 100 and the second substrate 200.

Next, as can be seen in Figure 6c, the bonded first substrate 100 and the second substrate 200 is cut into a liquid crystal cell.

The cutting process is generally performed through two scribing processes, and removes a predetermined region of the first substrate 100 and the second substrate 200 together through the first scribing line S1, The predetermined region of the second substrate 200 may be further removed through the second scribing line S2.

The region removed through the first scribing line S1 corresponds to the cutting region C / A in the above-described embodiment according to FIGS. 2 and 3.

Removing the predetermined region of the second substrate 200 through the second scribing line S2 is to expose the pad region P / A on the first substrate 100 to the outside as described above. to be.

As such, when the cutting process is performed, a liquid crystal cell as shown in FIG. 6D is completed. FIG. 6D is the same as the liquid crystal display according to FIG. 4 described above.

1 is a schematic layout of a conventional liquid crystal display substrate.

2 is a schematic layout of a substrate for a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a schematic plan view showing a configuration in an active region of a liquid crystal display substrate according to an exemplary embodiment of the present invention.

4 is a schematic cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention.

5 is a schematic layout of a substrate for a liquid crystal display according to an exemplary embodiment of the present invention.

6A to 6D are schematic process perspective views illustrating a manufacturing process of a liquid crystal display according to an exemplary embodiment of the present invention.

<Description of reference numerals of the main parts of the drawing>

100: substrate, first substrate 110: lighting test pad

120: connection bar 130: first connection line

140: second connecting line

Claims (10)

A substrate including an active area for displaying an image, a pad area in which pads are formed, and a cutting area in a liquid crystal cell process; A plurality of wirings formed in the active region; A lighting test pad formed in the pad area; And It comprises a connecting bar formed in the cutting area, Each of the wires is connected to the connection bar, and the connection bar is connected to the lighting test pad. The method of claim 1, And the connection bar and the lighting test pad are connected by a first connection line, and the connection bar and the plurality of wires are connected by a plurality of second connection lines. The method of claim 2, And the plurality of wires, the connection bar, the first connection line, and the second connection line are formed on the same layer of the same material. The method of claim 3, wherein And the plurality of second connection lines are individually connected to the connection bars without being connected to each other. The method of claim 1, And the wirings are gate wirings, data wirings or common wirings. A first substrate including an active area for displaying an image and a pad area in which pads are formed; A second substrate facing the first substrate; A liquid crystal layer formed between the first substrate and the second substrate; Interconnections formed in an active region of the first substrate; And It comprises a lighting test pad formed in the pad region of the first substrate, And a first connection line is connected to the lighting test pad, and a second connection line is connected to the wirings. The method of claim 6, One end of the first connection line is connected to the lighting test pad, and the other end of the first connection line extends to one side of the first substrate. One end of the second connection line is connected to the wiring, and the other end of the second connection line extends to one side of the first substrate. The method of claim 7, wherein And the first connection line and the second connection line are not connected to each other, and each of the second connection lines is not connected to each other. Preparing a first substrate; Preparing a second substrate; Bonding both substrates together while forming a liquid crystal layer between the first substrate and the second substrate; And And a step of cutting the bonded first substrate and the second substrate into a liquid crystal cell, The step of preparing the first substrate, Forming wirings in the active region; Forming a lighting test pad in the pad area; And And forming a connection bar connected to each of the wires in the cutting area and connected to the lighting test pad. 10. The method of claim 9, And a cutting region on the first substrate is cut during the step of cutting the bonded first substrate and the second substrate into a liquid crystal cell.

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