KR20130048434A - Liquid crystal display cell and manufacturing method of thereof - Google Patents

Abstract

PURPOSE: An LCD(Liquid Crystal Display) cell and a manufacturing method thereof are provided to block static electricity inside the LCD cell by forming a static electricity prevention electrode and a static electricity path on the boundary of a motherboard. CONSTITUTION: A motherboard(110) includes a cell area in which a plurality of LCD cells(120) is formed. A static electricity path(130) is arranged on the boundary of the cell area of the motherboard. The static electricity path is connected to a wiring formed on the cell area in order to form an equipotential path for the static electricity formed within the cell area. A static electricity prevention electrode(140) is arranged between the static electricity path and the edge of the motherboard and is electrically separated from the static electricity path.

Description

Liquid crystal display cell and manufacturing method thereof

Embodiment of the present invention relates to a liquid crystal display cell and a manufacturing method thereof.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. Accordingly, flat panel displays (FPDs), such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs), may be used. Usage is increasing. Among them, liquid crystal display devices capable of realizing high resolution and capable of not only miniaturization but also enlargement are widely used.

The liquid crystal display device includes a liquid crystal panel having a liquid crystal layer positioned between a transistor substrate on which a transistor, a storage capacitor, a pixel electrode, and the like are formed, and a color filter substrate on which a color filter and a black matrix are formed. The liquid crystal panel displays an image by emitting light incident from the backlight unit by adjusting an arrangement direction of the liquid crystal layer by an electric field formed in the pixel electrode and the common electrode.

The liquid crystal panel is formed by a method of forming a plurality of liquid crystal display cells on a mother substrate and proceeding to cut them into display cell units. On the other hand, an alignment film is formed on the mother substrate to help the liquid crystal layer be formed with orientation. The alignment layer is formed on the substrate through a rubbing process with a thin resin such as polyimide or polymer. The rubbing process generally uses a drum with a rubbing cloth attached thereto.

During the rubbing process, the drum to which the rubbing cloth is attached is charged with the rubbing cloth due to the friction generated when rotating on the alignment layer, thereby generating static electricity. As such, the generation of static electricity may cause disconnection and short circuit of the metal wires formed on the substrate or damage to the device.

Conventionally, in order to solve the problem caused by static electricity generated during the rubbing process, an antistatic electrode was formed in the outer edge region of the substrate. However, in the case of the conventionally applied antistatic electrode, there is a structural error that serves as a path for introducing static electricity generated during the rubbing process into the inside of the liquid crystal panel, and thus an improvement thereof is required.

Embodiment of the present invention for solving the above problems of the background, electrically separated from the outside of the mother substrate to block the passage of static electricity generated during contact and separation of the rubbing cloth and the mother substrate into the liquid crystal display cell. The present invention provides a liquid crystal display cell and a method of manufacturing the same.

Embodiments of the present invention as a problem solving means described above, the mother substrate including a cell region formed with a plurality of liquid crystal display cells; An electrostatic path located at an outer side of the cell region of the mother substrate and connected to a wiring formed in the cell region to form an equipotential path for static electricity formed in the cell region; And an antistatic electrode disposed between the electrostatic path and the edge of the mother substrate and electrically separated from the electrostatic path.

The antistatic electrode may be formed at a position spaced apart from the edge of the mother substrate so as to block a path through which static electricity generated by the rubbing device flows into the cell region from the edge region of the mother substrate.

The electrostatic path and the antistatic electrode may be formed at one side and the other side of the outer side of the cell region corresponding to the short side direction of the plurality of liquid crystal display cells.

The electrostatic path and the antistatic electrode may have a rectangular shape on one side and the other side of the outer side of the cell region facing the one side.

The electrostatic path may be formed corresponding to the length of the cell region, and the antistatic electrode may be formed to have a length greater than the length of the electrostatic path and smaller than or corresponding to the length of the mother substrate.

In another aspect, an embodiment of the present invention, defining a cell region in which a plurality of liquid crystal display cells are to be formed in a mother substrate, and forming a thin film transistor including an electrode and a wiring in the cell region; Forming an electrostatic path connected to a wiring formed in the cell region so as to form an equipotential path for static electricity formed in the cell region outside the cell region of the mother substrate; Forming an antistatic electrode disposed between the electrostatic path and the edge of the mother substrate and electrically separated from the electrostatic path; And forming an alignment layer on the thin film transistor of the mother substrate, positioning the rubbing device in the direction in which the antistatic electrode is formed, and performing rubbing.

The antistatic electrode may be formed at a position spaced apart from the edge of the mother substrate so as to block a path through which static electricity generated by the rubbing device flows into the cell region from the edge region of the mother substrate.

The electrostatic path and the antistatic electrode may be formed at one side and the other side of the outer side of the cell region corresponding to the short side direction of the plurality of liquid crystal display cells.

The electrostatic path and the antistatic electrode may have a rectangular shape on one side and the other side of the outer side of the cell region facing the one side.

The electrostatic path may be formed corresponding to the length of the cell region, and the antistatic electrode may be formed to have a length greater than the length of the electrostatic path and smaller than or corresponding to the length of the mother substrate.

According to an embodiment of the present invention, a liquid crystal in which an antistatic electrode and an electrostatic path are electrically separated from the outside of the mother substrate to block a passage through which the static electricity generated when the rubbing cloth and the mother substrate are contacted and separated from the inside of the liquid crystal display cell. It is effective to provide a display cell and a method of manufacturing the same. In addition, the embodiment of the present invention has the effect that can effectively remove the static electricity remaining in the rubbing cloth during the rubbing process to improve the drive failure and wiring defects of the liquid crystal display cell by the static electricity and improve the yield.

1 is a plan view of a liquid crystal display cell according to an embodiment of the present invention.
FIG. 2 is an enlarged view of the "Z" area shown in FIG.
3 is a partial cross-sectional view of a liquid crystal display cell.
4 is a view for explaining a rubbing process for forming an alignment film on a mother substrate.
5 and 6 are views for explaining the prevention of inflow of the electrostatic charge generated in the rubbing process of Figure 4 into the liquid crystal display cell.
7 is a cross-sectional view of a liquid crystal display panel manufactured according to an embodiment of the present invention.
8 is a configuration diagram of a liquid crystal display device using the liquid crystal display panel shown in FIG. 7.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view of a liquid crystal display cell according to an exemplary embodiment of the present invention, and FIG. 2 is an enlarged view of the region "Z" shown in FIG. 1.

As shown in FIGS. 1 and 2, the liquid crystal display cell according to the exemplary embodiment includes a mother substrate 110, an electrostatic path 130, and an antistatic electrode 140.

The mother substrate 110 includes a cell area CA in which a plurality of liquid crystal display cells 120 are formed. The plurality of liquid crystal display cells 120 are formed with thin film transistors including electrodes and wires to form respective display areas.

The electrostatic path 130 is located outside the cell area CA of the mother substrate 110 and is connected to the wiring 135 formed in the cell area CA to form an equipotential path for static electricity formed in the cell area CA. do. The electrostatic path 130 is connected to the common voltage wiring formed in the cell area CA through the wiring 135.

The antistatic electrode 140 is positioned between the electrostatic path 130 and the edge 110e of the mother substrate 110 and is formed to be electrically separated from the electrostatic path 130. The antistatic electrode 140 has an edge 110e of the mother substrate 110 to block a path from which static electricity generated by the rubbing device is introduced into the cell region CA from the edge region of the mother substrate 110 when the alignment layer is formed. It is formed at a position spaced from a certain distance from.

The electrostatic path 130 and the antistatic electrode 140 face one side EA1 and the other side EA1 of the outside of the cell area CA corresponding to the short side direction y of the plurality of liquid crystal display cells 120. It is formed in (EA2), respectively. That is, the electrostatic path 130 and the antistatic electrode 140 are formed at one side EA1 and the other side EA2 of the mother substrate 110 to be located at the start point and the end point of the rubbing direction RD. In this case, the electrostatic path 130 and the antistatic electrode 140 have rectangular shapes on one side EA1 and the other side EA2 of the cell area CA.

The electrostatic path 130 is formed corresponding to the length of the cell region CA. The antistatic electrode 140 is formed to have a length greater than the length of the electrostatic path 130 and smaller than the length of the mother substrate 110 or corresponding to the length of the mother substrate 110. The reason for the length of the antistatic electrode 140 as described above is to effectively form the path of static electricity generated from the rubbing cloth of the rubbing device.

As described above, the antistatic electrode 140 is located at a position spaced apart from the edge 110e of the mother substrate 110 to block a path flowing into the cell area CA from the edge region of the mother substrate 110. Is formed. In more detail, the antistatic electrode 140 is formed at a position spaced apart from the short side direction y of the edge 110e of the mother substrate 110 to have a first distance Dy. Here, the first distance Dy is optimized according to the design value of the mother substrate 110.

As described above, the static electricity path 130 and the antistatic electrode 140 are formed on the mother substrate 110 so as to be electrically separated, and the antistatic electrode 140 is formed at the edge 110e of the mother substrate 110. The reason for forming at a position spaced from the predetermined distance will be described in more detail in the following manufacturing method.

3 is a partial cross-sectional view of a liquid crystal display cell, and FIG. 4 is a view for explaining a rubbing process for forming an alignment layer on a mother substrate, and FIGS. 5 and 6 are liquid crystal displays of electrostatic charges generated during the rubbing process of FIG. It is a figure for demonstrating the inflow prevention in a cell.

As illustrated in FIGS. 1 to 6, a cell region CA in which a plurality of liquid crystal display cells 120 are to be formed in the mother substrate 110 is defined, and a thin film including electrodes and wirings in the cell region CA. Form a transistor.

In the cell area CA, thin film transistors 111, 113, 114a, and 114b shown in FIG. 3 are formed for each of the plurality of liquid crystal display cells 120. The structure of the thin film transistors 111, 113, 114a, and 114b is as follows.

The gate electrode 111 is formed on one surface of the mother substrate 110. The gate electrode 111 is selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be formed of a single layer or multiple layers of any one or alloys thereof.

The first insulating layer 112 is formed on the gate electrode 111. The first insulating layer 112 may be formed of an oxide film SiOx or a silicon nitride film SiNx.

The active layer 113 is formed on the first insulating layer 112. The active layer 113 may include amorphous silicon or polycrystalline silicon crystallized therefrom. Although not shown, an ohmic contact layer may be further formed on the active layer 113 to reduce contact resistance with the source and drain electrodes 114a and 114b.

Source and drain electrodes 114a and 114b are formed on the active layer 113. The source and drain electrodes 114a and 114b are made of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be formed of a single layer or multiple layers of any one or an alloy thereof selected from the group consisting of.

The second insulating layer 115 is formed on the source and drain electrodes 114a and 114b to expose the source or drain electrodes 114a and 114b. The second insulating film 115 may be formed of an oxide film SiOx or a silicon nitride film SiNx.

The pixel electrode 116 is formed on the second insulating film 115. The pixel electrode 116 may be formed of a transparent oxide electrode such as indium tin oxide (ITO) or indium zinc oxide (IZO).

Although not shown, the common electrode forming the electric field together with the pixel electrode 116 may be formed on the mother substrate 110 or the color filter substrate covering the mother substrate 110 according to the driving mode of the liquid crystal display cell. do. In addition, the illustrated pixel electrode 116 is only for structural understanding, and may also be variously formed according to the driving mode of the liquid crystal display cell.

An electrostatic path 130 connected to the wiring 135 formed in the cell region CA is formed on the outer side of the cell region CA of the mother substrate 110 to form an equipotential path for static electricity formed in the cell region CA. . The electrostatic path 130 is formed of the same process and the same material as one of the steps of forming the thin film transistors 111, 113, 114a, and 114b and the pixel electrode 116 on one surface of the mother substrate 110.

The antistatic electrode 130 is disposed between the electrostatic path 130 and the edge 110e of the mother substrate 110 to form an antistatic electrode 140 electrically separated from the electrostatic path 130.

The antistatic electrode 140 has an edge of the mother substrate 110 to block a path from which static electricity generated by the rubbing device 170 flows into the cell area CA from the edge region of the mother substrate 110 when the alignment layer is formed. It is formed at a position spaced a certain distance from 110e.

The electrostatic path 130 and the antistatic electrode 140 face one side EA1 and the other side EA1 of the outside of the cell area CA corresponding to the short side direction y of the plurality of liquid crystal display cells 120. It is formed in (EA2), respectively. In this case, the electrostatic path 130 and the antistatic electrode 140 have rectangular shapes on one side EA1 and the other side EA2 of the cell area CA.

The electrostatic path 130 is formed corresponding to the length of the cell region CA. The antistatic electrode 140 may be formed to be larger than the length of the electrostatic path 130 and smaller than or corresponding to the length of the mother substrate 110.

The drum 171 is formed on the plurality of liquid crystal display cells 120 formed on the mother substrate 110 to form an alignment layer 125 made of polyimide or polymer, and rotate in one direction in the direction in which the antistatic electrode 140 is formed. And a rubbing device 170 including a rubbing cloth 175. And rubbing in the rubbing direction RD. Here, the alignment layer 125 is formed on the top of the insulating layer constituting the liquid crystal display cell 120. When the rubbing process is completed, the alignment layer 125 is provided with alignment grooves for aligning the liquid crystals.

Meanwhile, when the electrostatic path 130 and the antistatic electrode 140 are formed as shown in FIGS. 5 and 6, problems caused by static electricity generated by the rubbing device 170 are prevented as follows.

First, the electrostatic charge charged in the rubbing cloth 175 of the rubbing device 170 by friction with another medium or the like is caused by the first antistatic electrode 140a formed on one side EA1 of the mother substrate 110. Discharged.

At this time, since the first antistatic electrode 140a and the first electrostatic path 130a are electrically separated, the static electricity discharged to the first antistatic electrode 140a affects the first electrostatic path 130a. It will not go crazy.

Thereafter, when the rubbing device 170 moves in the rubbing direction RD, an alignment groove is formed in the alignment layer 125. In this process, the electrostatic charge is charged to the rubbing cloth 175 of the rubbing device 170 by the rotation of the rubbing device 170 and the friction with the mother substrate 110. It is discharged to the two static electricity pass 130b.

Then, when the rubbing device 170 passes the other side EA2 of the mother substrate 110, the static electricity remaining on the rubbing cloth 175 of the rubbing device 170 is discharged to the second antistatic electrode 140b. .

As can be seen in the above description, the electrostatic charges formed on the rubbing cloth 175 are mostly discharged by the first antistatic electrode 140a and the second antistatic electrode 140b positioned at the start and end points of the rubbing process. Even if there is an undischarged electrostatic charge, since the antistatic electrode and the electrostatic path having the same structure are formed on the other mother substrate, the influence of the electrostatic generated during the rubbing process will be minimized.

As described above, the alignment layer 125 is formed on the mother substrate 110, and the alignment layer is formed on the color filter substrate. The liquid crystal display panel is completed by forming a liquid crystal layer between the two substrates and cutting the bonded liquid crystal display cell unit.

7 is a cross-sectional view of a liquid crystal display panel manufactured according to an exemplary embodiment of the present invention, and FIG. 8 is a configuration diagram of a liquid crystal display device using the liquid crystal display panel shown in FIG. 7.

As shown in FIG. 7, the liquid crystal display panels 110 and 180 include a thin film transistor substrate 110 including thin film transistors 111, 113, 114a, and 114b, a pixel electrode 116, and a lower alignment layer 125. The liquid crystal layer 127 is formed between the color filter substrate 180 including the black matrix 117, the color filter 118, the overcoating layer 119, and the upper alignment layer 129.

In the illustrated liquid crystal display panels 110 and 180, a vertical electric field driving method such as twisted nematic (TN) mode and a vertical alignment (VA) mode, or an in-plane switching (IPS) mode and a ring field switching (FFS) mode may be used. It can be configured as a horizontal electric field driving method. The common electrode, which is not shown, may be formed on the thin film transistor substrate 110 or the color filter substrate 180 according to the driving method of the liquid crystal display panels 110 and 180. In addition, the pixel electrode 125 may also be formed in various structures according to the driving method of the liquid crystal display panels 110 and 180.

The liquid crystal display panels 110 and 180 described above are driven under the control of the gate driver, the data driver, and the timing controller, and display an image by adjusting the transmittance of light provided from the backlight unit disposed below the liquid crystal layer 127. You can do it. Here, the gate driver, the data driver and the timing controller may be configured as follows.

As shown in FIG. 8, the liquid crystal display panels 110 and 180 may include a gate driver 191 for supplying a gate signal, a data driver 192 for supplying a data signal, a gate driver 191, and a data driver 192. Includes a timing controller 195 for controlling the.

The gate driver 191 is configured by a gate-in panel method formed on a substrate during a thin film transistor process, so that the gate driver 191 may be disposed on at least one of the first and second side non-display areas of the liquid crystal display panels 110 and 180. It may be formed or configured in an integrated circuit (IC) manner. The data driver 192 may be mounted on the tape carrier package 193 and attached to the third side non-display area of the liquid crystal display panels 110 and 180 while being connected to the printed circuit board 194. The timing controller 195 may be mounted on the printed circuit board 194 to control the gate driver 191 and the data driver 192 in cooperation with the system board.

As described above, the embodiment of the present invention is provided with an antistatic electrode and an electrostatic path that are electrically separated from the outside of the mother substrate so as to block a passage through which the static electricity generated when the rubbing cloth and the mother substrate are contacted and separated from the liquid crystal display cell. Provided are a liquid crystal display cell and a method of manufacturing the same. Embodiments of the present invention minimize the effect of static electricity by electrical separation from the electrostatic path while reducing the area of the pattern occupied by the antistatic electrode compared to the conventional structure. The embodiment of the present invention can effectively remove the static electricity remaining in the rubbing cloth during the rubbing process to improve the driving failure and wiring defects of the liquid crystal display cell by the static electricity and improve the yield.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

110: mother substrate 130: static electricity path
140: antistatic electrode CA: cell area
135: wiring 120: liquid crystal display cell
170: rubbing device 171: drum
175: rubbing gun RD: rubbing direction

Claims (10)

A mother substrate including a cell region in which a plurality of liquid crystal display cells are formed;
An electrostatic path located at an outer side of the cell region of the mother substrate and connected to a wiring formed in the cell region to form an equipotential path for static electricity formed in the cell region; And
And an antistatic electrode disposed between the electrostatic path and the edge of the mother substrate and electrically separated from the electrostatic path. The method of claim 1,
The antistatic electrode is
The liquid crystal display cell of claim 1, wherein the static electricity generated by the rubbing device is formed at a position spaced apart from the edge of the mother substrate to block a path from the edge region of the mother substrate to the inside of the cell region. The method of claim 1,
The electrostatic path and the antistatic electrode
And a liquid crystal display cell formed at one side of the outer edge of the cell region corresponding to the short side direction of the plurality of liquid crystal display cells and the other side facing the one side. The method of claim 1,
The electrostatic path and the antistatic electrode
And a rectangular shape formed at one side of the outer side of the cell region and the other side facing the one side. The method according to claim 3 or 4,
The electrostatic path is formed corresponding to the length of the cell region
And the antistatic electrode is formed to have a length greater than a length of the electrostatic path and smaller than or corresponding to a length of the mother substrate. Defining a cell region in which a plurality of liquid crystal display cells are to be formed in the mother substrate, and forming a thin film transistor including an electrode and a wiring in the cell region;
Forming an electrostatic path connected to a wiring formed in the cell region so as to form an equipotential path for static electricity formed in the cell region outside the cell region of the mother substrate;
Forming an antistatic electrode disposed between the electrostatic path and the edge of the mother substrate and electrically separated from the electrostatic path; And
Forming an alignment layer on the thin film transistor of the mother substrate, placing a rubbing device in a direction in which the antistatic electrode is formed, and performing rubbing. The method according to claim 6,
The antistatic electrode is
Method of manufacturing a liquid crystal display cell, characterized in that the static electricity generated by the rubbing device formed at a position spaced a predetermined distance from the edge of the mother substrate to block the path flowing into the cell region from the edge region of the mother substrate. . The method according to claim 6,
The electrostatic path and the antistatic electrode
The liquid crystal display cell manufacturing method according to claim 1, wherein the liquid crystal display cell is formed on one side of the outside of the cell region corresponding to the short side direction of the plurality of liquid crystal display cells and the other side facing the one side. The method according to claim 6,
The electrostatic path and the antistatic electrode
And a rectangular shape formed at one side of the outer side of the cell region and the other side facing the one side. 10. The method according to claim 8 or 9,
The electrostatic path is formed corresponding to the length of the cell region,
The antistatic electrode is a manufacturing method of a liquid crystal display cell, characterized in that formed to have a length greater than the length of the electrostatic path and less than or corresponding to the length of the mother substrate.

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