KR101702074B1 - Method for fabricating liquid crystal panel - Google Patents

Method for fabricating liquid crystal panel Download PDF

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Publication number
KR101702074B1
KR101702074B1 KR1020100111102A KR20100111102A KR101702074B1 KR 101702074 B1 KR101702074 B1 KR 101702074B1 KR 1020100111102 A KR1020100111102 A KR 1020100111102A KR 20100111102 A KR20100111102 A KR 20100111102A KR 101702074 B1 KR101702074 B1 KR 101702074B1
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KR
South Korea
Prior art keywords
substrate
liquid crystal
gate
color filter
metal layer
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KR1020100111102A
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Korean (ko)
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KR20120049708A (en
Inventor
이휘득
이경하
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133351—Manufacturing of individual cells out of a plurality of cells, e.g. by dicing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13458—Terminal pads
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • G02F2201/501—Blocking layers, e.g. against migration of ions

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a narrow bezel capable of reducing a non-display area where an image of a liquid crystal panel is not displayed.
A feature of the present invention is that a protective metal layer is further formed in a non-display area where gate and data pad terminal electrodes of the array substrate are formed, and the color filter substrate is completely cut using a laser.
As a result, damage to the gate and data pad terminal electrodes of the array substrate can be prevented by the laser beam irradiated to the color filter substrate, a break process can be eliminated, and a cutting burr is generated on the cut surface of the substrate Can be prevented.
Therefore, it is possible to prevent the bezel area of the liquid crystal display device from being widened, and it is possible to prevent the cable, which is a signal transmission connection member for connecting between the circuit boards due to the cutting burr, from being damaged. This makes it possible to prevent the driving operation failure of the liquid crystal panel or the circuit part from being damaged.

Description

[0001] The present invention relates to a method for fabricating a liquid crystal panel,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display having a narrow bezel capable of reducing a non-display area in which an image of a liquid crystal panel is not displayed.

Recently, a liquid crystal display device has attracted attention as an advanced display device having low power consumption, good portability, technology-intensive, and high added value

In such a liquid crystal display device, two substrates having electrodes formed on one side thereof are arranged so as to face each other, liquid crystal is injected between the electrodes of the two substrates, and voltage is applied to electrodes formed on the substrates The liquid crystal molecules are caused to move by the electric field which is generated by the liquid crystal molecules, and the image is expressed by the transmittance of light depending on the positional change of the liquid crystal.

1 is a schematic plan view of a general liquid crystal display device.

As shown in the drawing, the array substrate 11 on which the thin film transistor T is formed and the color filter substrate 12 on which the color filter (not shown) is formed face each other with a liquid crystal layer (not shown) therebetween, The array substrate 11 and the color filter substrate 12 are separated from each other and the marginal portions of the array substrate 11 and the color filter substrate 12 are sealed and sealed together via a seal pattern 20.

A display area AA for displaying an image and a non-display area NA are defined on the array substrate. Under the assumption of the active matrix method, on the inner surface of the display area AA of the array substrate 11, A pixel P is defined by intersection of the wiring GL and the data line DL and a thin film transistor T is provided at each intersection to form a transparent pixel electrode One-to-one correspondence.

At this time, a gate and a data pad electrode (not shown) are connected to the gate and data lines GL and DL, respectively, in a non-display area NA on one side of the array substrate 11 on which the gate and data lines GL and DL are arranged, And the gate and data lines GL and DL are connected to an external driver circuit board (not shown).

A color filter (not shown) of red (R), green (G), and blue (B) colors and a color filter (not shown) corresponding to each pixel P are formed on the inner surface of the color filter substrate 12, And a black matrix (not shown) is provided at a position corresponding to the gate line GL, the data line DL, the thin film transistor T, or the like.

That is, a black matrix (not shown) is formed to separate each pixel P in the display area AA and also to capture the display area AA at the edge of the display area AA, which is the non- .

The color filter substrate 12 is provided with a transparent common electrode (not shown) covering a color filter (not shown) and a black matrix (not shown).

The array substrate 11 and the color filter substrate 12 are bonded together by pressing the substrates 11 and 12 in a state in which a UV curable or thermosetting sealant is applied to the edge of any one of the substrates 11 and 12 And the sealant is cured by irradiating UV light or an appropriate temperature having an appropriate wavelength for an appropriate period of time to form the seal pattern 20.

The seal pattern 20 is formed in the non-display area NA covering the edge of the display area AA and serves as an encapsulating agent.

Meanwhile, in order to shorten the manufacturing process or improve the yield, the liquid crystal display device is operated on first and second large-area substrates (bare or mother glass) divided into positions by a plurality of cell regions.

At this time, an actual pattern 20 for coalescence is formed in any one of the first and second large-area substrates, and then both substrates are bonded together with a liquid crystal layer (not shown) interposed therebetween. And a plurality of liquid crystal panels 10 are obtained by cutting each region.

Particularly, in the cutting process of a cell process, a scribing process in which a laser is used to scribe each cell region so as to form a line-shaped scratch, a break is performed using a break bar, Process.

At this time, the line-shaped scratches formed by the laser in the scribing process are formed with a width of about 300-400 탆, and a cutting burr corresponding to the scratch width is formed on the cut surface of the substrate.

Therefore, since the non-display area NA is widened due to the cutting burr, a liquid crystal display device having a narrow bezel that is recently required can not be realized.

In addition, the cutting bur damages a cable (not shown) for applying a driving signal or the like to the liquid crystal display device, thereby causing a fatal problem such as disconnection of a cable (not shown) or peeling of a cover to expose a wire to the outside.

As a result, a driving operation failure of the liquid crystal panel 10 occurs or a circuit part (not shown) is damaged.

It is a first object of the present invention to provide a liquid crystal display device having a narrow bezel for solving the above problems.

A second object of the present invention is to prevent the pad portion from being damaged during the cutting process of the liquid crystal display device. The second object of the present invention is to prevent the occurrence of cutting burrs and to prevent the cable, The third purpose is what you want to do.

It is a fourth object of the present invention to prevent a driving operation failure of the liquid crystal panel or a circuit part from being damaged.

According to an aspect of the present invention, there is provided a method of manufacturing a display device, including: providing a first substrate and a second substrate on which a display area and a non-display area are defined; Forming a protective metal layer on the non-display region of the first substrate; Applying a sealant to the non-display area of one of the first substrate and the second substrate; Attaching the first and second substrates together, and interposing a liquid crystal layer between the first and second substrates; Curing the sealant to form a seal pattern; Irradiating a laser from the upper portion of the second substrate to the outside of the seal pattern to cut the second substrate; And removing the protective metal layer. The present invention also provides a method of manufacturing a liquid crystal panel.

At this time, gate and data pad electrodes, gate and data link wiring, gate and data pad electrode terminals are formed in the non-display area, and the protective metal layer is formed of chromium (Cr), aluminum (Al), molybdenum (Mo), silver (Ag), and gold (Au).

The protective metal layer may be dipped in an etchant or removed by spraying an etchant. The etchant may be formed of a material that does not react with the gate and data pad terminal electrodes.

The first substrate is an array substrate in which thin film transistors are located at intersections of gates and data lines and the gate and data lines, and the second substrate is a color filter substrate having a color filter and a black matrix formed in the display region , A laser is irradiated from the bottom of the first substrate to the outside of the non-display area in the step of cutting the second substrate to cut the first substrate.

The first and second substrates are each formed of a plurality of unit cells including the seal pattern to be liquid crystal panels.

As described above, according to the present invention, a protective metal layer is further formed in a non-display area where the gate and data pad terminal electrodes of the array substrate are formed, and the color filter substrate is completely cut using a laser, There is an effect that the gate of the array substrate and the data pad terminal electrode can be prevented from being damaged by the laser irradiated to the substrate.

Further, it is possible to eliminate the break process, and it is possible to prevent a cutting burr from being generated on the cut surface of the substrate.

Accordingly, it is possible to prevent the bezel area of the liquid crystal display device from being widened, and it is possible to prevent damage to the cable, which is a signal transmission connection member connecting the circuit boards due to the cutting burr. Accordingly, it is possible to prevent the driving operation failure of the liquid crystal panel or the circuit part from being damaged.

1 is a schematic plan view of a general liquid crystal display device.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device.
Fig. 3 is a plan view schematically showing a part of the array substrate after the second step of Fig. 2 is performed. Fig.
4A to 4E are cross-sectional views of a liquid crystal cell cut along the cutting lines I-I 'and II-II' of FIG. 3 according to the process flow from the eighth step to the ninth step of the TFT- Sectional view schematically showing a part thereof.

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

2 is a flow chart showing a step of manufacturing a liquid crystal display device according to an embodiment of the present invention.

First, the liquid crystal display device performs a TFT-LCD cell process (St10), and forms a liquid crystal cell through the cell process St10.

In more detail, the TFT-LCD cell process (St10) mainly includes a color filter substrate and an array substrate formation (St11), a protective metal layer formation (St12), an orientation film formation (St13), a sealant application and spacer formation (St14) (St15), adhesion (St16), sealant hardening (St17), cutting (St18), protective metal layer removal (St19), and inspection process (St20).

The first stage St11 of the TFT-LCD cell process St10 is a process of forming an upper substrate, which is a color filter substrate, and a lower substrate, which is an array substrate, and then a foreign substance which may exist on the substrate before the alignment film is applied As shown in FIG.

At this time, on the inner surface of the display area of the array substrate, a plurality of gate wirings and data wirings cross each other to define pixels, and a thin film transistor is provided at each of the intersections to be connected to the transparent pixel electrodes formed on each pixel in a one- .

On the inner surface of the color filter substrate, a color filter of red (R), green (G), and blue (B) colors corresponding to each pixel and a color filter , And a transparent common electrode covering the non-display elements are provided on a first black matrix.

At this time, the array substrate is formed so as to have a larger area than the color filter substrate. In a region formed to be larger than the color filter substrate, a pad portion having gates and data pad electrodes connected to the gates and the data lines is formed.

The gate and data pad electrodes are connected to each other through the gate wiring and the data wiring and the link wiring. The gate and data pad electrodes minimize the influence by the external environment and prevent adhesion failure between the external signal wiring and each pad A separate gate and data pad terminal electrodes are formed.

Next, in the second step (St12), the liquid crystal display device of the present invention forms a protective metal layer on the gate and data pad terminal electrodes formed on the non-display area of the array substrate, which is formed in a larger area than the color filter substrate, .

The protective metal layer is preferably made of a metal material having a high reflectance (90% or more). For example, chromium (Cr), aluminum (Al), molybdenum (Mo), silver (Ag) .

The protective metal layer is used to prevent damage to the gate and data pad terminal electrodes and the link wiring by the laser in the process of cutting the color filter substrate.

Let me take a closer look at this later.

The third step St13 is a step of forming an alignment film on the color filter substrate and the array substrate. In the fourth step St14, a sealant is applied so as to prevent the liquid crystal interposed between the color filter substrate and the array substrate from leaking, Is a process of dispersing a spacer of a certain size in order to precisely and uniformly maintain the gap between the color filter substrate and the array substrate.

Here, the sealant is applied to the edge of either the color filter substrate or the array substrate, and the sealant is formed in the non-display area covering the edge of the display area.

The fifth step St15 of the TFT-LCD cell process St10 is a step of dropping liquid crystal on a selected one of the substrates, and the sixth step St16 is a step of bonding the color filter substrate and the array substrate And then proceeds to a seventh step (St17) for hardening the sealant.

This completes the original liquid crystal cell.

Next, after the sealant curing process (St17) of the TFT-LCD cell process (St10), the eighth step (St18) of cutting the original liquid crystal cell into cell units is performed.

Here, the liquid crystal display device of the present invention is characterized in that the step of cutting the disk liquid crystal cell proceeds using a laser.

Particularly, the liquid crystal display of the present invention is characterized in that each array substrate and the color filter substrate are cut at once using a laser without a separate break process.

Therefore, it is possible to prevent a cutting burr from being generated on the cut surface of the substrate, to prevent the bezel area of the liquid crystal display device from being widened, It is possible to prevent the cable, which is a cable, from being damaged.

This makes it possible to prevent the driving operation failure of the liquid crystal panel or the circuit part from being damaged.

Next, the ninth step St19 is a step of removing the protective metal layer on the gate and data pad terminal electrodes exposed to the outside of the seal pattern.

At this time, the protective metal layer is subjected to an etching process such as dipping in which a part of the protective metal layer exposed in the water tank containing the etching solution reacted with the protective metal layer is dipped, or an etching process is performed on the exposed surface of the protective metal layer, .

At this time, it is preferable to use an etchant that does not react with the gate and data pad terminal electrodes formed under the protective metal layer.

Finally, the tenth step (St20) of the TFT-LCD cell process (St10) is an inspection process of the unit liquid crystal cell. And the quality of the unit liquid crystal cell is selected through an inspection process.

As a result, the TFT-LCD cell process (St10) is completed and the unit liquid crystal cell is completed.

Next, a polarizer attaching step (St20) for attaching the polarizer to each outer side of the array substrate and the color filter substrate of the completed unit liquid crystal cell is performed. The polarizer is composed of a unit liquid crystal cell, It plays a role.

Next, a driving circuit attaching step (St30) is carried out. In the driving circuit, a driving circuit for connecting an array substrate of the unit liquid crystal cell to an electrical signal is directly mounted on a tape carrier package (TCP) To the unit liquid crystal cell.

Thus, a liquid crystal panel that can actually be driven is completed.

Such a driving circuit is divided into a gate driving circuit for transferring the on / off signal of the thin film transistor to the gate wiring of the liquid crystal panel, and a data driving circuit for transferring the image signal per frame to the data wiring, Can be located at two adjacent edges.

When the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit to be scanned, the signal voltage of the data driving circuit is applied to the liquid crystal panel through the data line And the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

Next, a cell test process (St40) is performed. In the cell test process, when one liquid crystal panel attached to the driving circuit is completed, it is fully driven to inspect whether it can be displayed.

Through this inspection process, a good quality liquid crystal panel is selected.

The backlight unit assembling process includes a light source on the bottom surface of the liquid crystal panel, a light source guide for guiding the light source, a light guide plate for advancing the light incident from the light source toward the liquid crystal panel, Of the optical sheet.

Alternatively, an edge type using a light guide plate has been described in the above description. However, a direct type in which a plurality of light sources are arranged in parallel under the liquid crystal panel in a state in which the light guide plate is omitted may be used.

In this case, a fluorescent lamp such as a cathode cathode fluorescent lamp or an external electrode fluorescent lamp may be used as a light source. Alternatively, a light emitting diode lamp may be used as a light source in addition to such a fluorescent lamp.

The case is assembled after the backlight unit assembling process. The case assembly is modularized through a top cover, a support main, and a cover bottom. The top cover is a rectangular frame having a "B" cross section so as to cover the top and side edges of the liquid crystal panel. And displays an image implemented in the panel.

In addition, the cover bottom on which the liquid crystal panel and the backlight unit are mounted and which is the basis for assembling the entire structure of the liquid crystal display device module is formed into a rectangular plate shape and its four edges are vertically bent at a predetermined height.

Also, a support main body, which is placed on the cover bottom and covers the edges of the liquid crystal panel and the backlight unit, is assembled with the top cover and the cover bottom to complete a liquid crystal display module.

In the meantime, the liquid crystal display of the present invention further includes a gate and data pad electrode formed in a non-display area of the array substrate formed in a larger area than the color filter substrate in the TFT-LCD cell process (St10) (St12), it is possible to cut the substrate at one time by using a laser without a break process in the process of cutting the color filter substrate, and it is possible to prevent a cutting burr from being generated on the cut surface of the color filter substrate .

Therefore, it is possible to prevent the bezel area of the liquid crystal display device from being widened, and it is possible to prevent the cable, which is a signal transmission connection member for connecting between the circuit boards due to the cutting burr, from being damaged.

This makes it possible to prevent the driving operation failure of the liquid crystal panel or the circuit part from being damaged.

FIG. 3 is a plan view schematically showing a part of the array substrate after the second step of FIG.

As shown in the figure, on the array substrate 101, a plurality of gate lines GL are formed in the display region AA for displaying an image in the first direction, and in a second direction intersecting the first direction A data line DL for defining the pixel P is formed in addition to the gate line GL.

In each pixel P, a driving thin film transistor T, which is a switching element connected to the two wirings, is formed at a portion where the gate wiring GL and the data wiring DL cross each other.

A gate pad portion GPA of a plurality of gate pad electrodes 124 formed at one end of a plurality of gate lines GL is formed in a non-display region NA outside the display region AA, A plurality of data pad electrodes 125 connected to the ends of the plurality of data lines DL are formed in the data pad unit DPA on the other side of the substrate 101 which is not parallel to the pad unit GPA.

The gate and data pad electrodes 124 and 125 are electrically connected to the gate line GL and the data line DL through the gate and data link lines 126 and 127, respectively.

At this time, the gate and data pad electrodes 124 and 125 are formed with separate gates (not shown) in order to minimize the influence of the external environment and to prevent adhesion failure between external signal lines (not shown) and the pad electrodes 124 and 125 And data pad terminal electrodes 128 and 129 are formed.

In the non-display area NA covering the edge of the display area AA, an actual pattern 120 for attaching to a color filter substrate (not shown) is formed.

At this time, the seal pattern 120 may be formed on a color filter substrate (not shown). In this case, the seal pattern 120 is brought into contact with the array substrate 101 as shown in the drawing, As shown in the drawing.

At this time, an area formed to be larger than the color filter substrate (not shown) at the outer side of the seal pattern 120 of the array substrate 101 is a gate surrounding the outer edge of the seal pattern 120, 126, and 127 and the gate and data pad terminal electrodes 128 and 129, respectively.

The protective metal layer 200 is damaged during the cell cutting process St18 of the TFT-LCD cell process St10 by causing the laser to damage the gate and data pad terminal electrodes 128 and 129 and the gate and data link wires 126 and 127 .

This protective metal layer 200 is removed after the cell cutting process.

4A to 4E are cross-sectional views of a liquid crystal cell cut along the cutting lines I-I 'and II-II' shown in FIG. 3 according to the process flow from the eighth step to the ninth step of the TFT- 1 is a cross-sectional view schematically showing a part thereof.

Prior to explanation, such a liquid crystal cell is divided into a display area AA in which an image is displayed and a non-display area NA that covers the edge of the display area AA.

4A is a part of the array substrate 101 and the color filter substrate 102 after the seventh step of FIG. 2 has been performed. As shown in FIG. 4A, on the inner surface of the display area AA on the array substrate 101, (Not shown) and a data line (not shown) intersect each other to define a pixel P. In each pixel P, a pixel electrode 123 is formed.

A gate electrode 111, a gate insulating film 113, a semiconductor layer 115, source and drain electrodes 117 and 119, and a protective layer (not shown) are formed at intersections of these gate wirings (not shown) And a thin film transistor T which is a switching element formed of a thin film transistor (TFT) 121.

At this time, the semiconductor layer 115 is composed of an active layer 115a of pure amorphous silicon and an amorphous silicon ohmic contact layer 115b containing impurities. At this time, the thin film transistor T is formed of amorphous A bottom gate type silicon silicon layer 115a or 115b is shown as an example. Alternatively, the top gate type silicon layer may include a polysilicon semiconductor layer.

Gate and data link wirings 126 and 127 connected to gates and data wirings (not shown) are formed in the non-display area NA of the array substrate 101 formed with a larger area than the color filter substrate 102 Gate and data pad portions GPA and DPA including gate and data pad electrodes 124 and 125 and gate and data pad terminal electrodes 128 and 129 are provided.

At this time, the gate and data link wirings 126 and 127 and the gate and data electrode terminals 128 and 129 are completely formed in the gate and data pad portions GPA and DPA of the non-display area NA of the array substrate 101 A protective metal layer 200 is formed.

The inner surface of the color filter substrate 102 facing the array substrate 101 is provided with a thin film transistor T and gate wirings (not shown) and data wirings (not shown) A black matrix 131 of a lattice shape is formed by covering the pixel P so as to expose only the pixel electrode 123 while covering the non-display area irrelevant to the driving.

Green (R), green (B), and blue (B) color filters 133 and the black matrix 131, which are sequentially and repeatedly arranged in correspondence with the respective pixels P in the lattice of the black matrix 131, And the color filter 133, and a common electrode 135 is provided.

At this time, between the liquid crystal layer 150, the pixel electrode 123 and the common electrode 135, first and second alignment films (not shown) in which surfaces facing the liquid crystal are respectively rubbed in a predetermined direction are interposed, Aligning the initial alignment state of the molecules and the alignment direction uniformly.

A sealant is applied to the edges of the array substrate 101 and the color filter substrate 102 to prevent leakage of the liquid crystal layer 150. The sealant is a polymer mixture in which an epoxy resin and a curing accelerator are mixed, And is cured by UV light irradiation to form the seal pattern 120 serving as an adhesive for maintaining the coalescence state of the two substrates 101 and 102.

The seal pattern 120 also serves as a gap for uniformly controlling the cell gap between the substrates 101 and 102 defined by the thickness of the liquid crystal layer 150. [

That is, the sealant is formed in the non-display area NA covering the edge of the display area AA and serves as an encapsulant for the liquid crystal cell.

Next, the process of cutting the substrates 101 and 102 in the eighth step of FIG. 2 in a cell unit is performed. In order to improve the yield in manufacturing the unit liquid crystal cell, a plurality of unit liquid crystal cells Are formed at the same time. Therefore, a process for separating the unit liquid crystal cells from the large-sized mother substrate by cutting and processing the mother substrate on which the plurality of liquid crystal cells are formed is required.

The array substrate 101 includes gate and data pad electrodes (not shown) connected to gates and data lines (not shown), respectively, in a non-display area NA on one side of the array substrate 101 on which gates and data lines The color filter substrate 102 and the array substrate 101 are formed so as to have a larger area than the color filter substrate 102 by forming the gate and data pad portions GPA, And each of them is cut by using the laser LB, thereby separating the original liquid crystal cell into the unit liquid crystal cell.

4B, in the process of cutting the color filter substrate 102, the cutting line A is formed corresponding to the outer edge of the seal pattern 120, and the laser beam emitted from the laser oscillator 160 (LB) cuts the color filter substrate 102 in correspondence with the outer edge of the seal pattern 120.

The cutting line B of the array substrate 101 corresponds to the outside of the non-display area NA of the array substrate 101 and the laser LB is irradiated to cut the array substrate 101. [ Thereby, the original liquid crystal cell is separated into the unit liquid crystal cell.

Here, the laser beam LB irradiated to the color filter substrate 102 is irradiated with an intensity enough to cut the color filter substrate 102 completely.

The laser beam LB irradiated at such a strength that the color filter substrate 102 can be completely cut is irradiated to the non-display area NA of the array substrate 101 on which the gate and data pad terminal electrodes 128 and 129 are formed . However, at this time, the protective metal layer 200 is formed on the gate and data pad terminal electrodes 128 and 129, and is irradiated up to the non-display area NA of the array substrate 101 as shown in FIG. 4C The laser LB is reflected by the protective metal layer 200 so that the gate and data pad terminal electrodes 128 and 129 and the gate and data link wires 126 and 127 located under the laser LB are damaged by the laser LB .

Here, the laser oscillator 160 may be a CO2 laser, a YAG laser, a femtosecond laser, or the like.

Therefore, in the liquid crystal display device of the present invention, it is not necessary to perform separate breaking process by completely cutting the color filter substrate 102 and the array substrate 101 through the laser LB.

Accordingly, it is possible to prevent a cutting burr from being generated on the cut surfaces of the substrates 101 and 102.

Accordingly, it is possible to prevent the bezel area of the liquid crystal display device from being widened, and it is possible to prevent a cable (not shown), which is a signal transmission connection member for connecting between the circuit boards due to the cutting burr, from being damaged. This makes it possible to prevent the driving operation failure of the liquid crystal panel or the circuit part from being damaged.

Next, FIG. 4D is a part of the unit liquid crystal cell in which the ninth step of FIG. 2 is performed. As shown in FIG. 4D, the array substrate 101 of the unit liquid crystal cells, which has undergone the cutting process of the color filter substrate 102 and the array substrate 101, The protective metal layer 200 is exposed on the gate and data pad terminal electrodes 128 and 129 exposed on the non-display area NA of the data line 101 and on the gate and data link lines 126 and 127, The metal layer 200 is removed.

At this time, the protective metal layer 200 is etched by, for example, spraying an etchant S on the exposed surface of the protective metal layer 200, thereby removing the protective metal layer 200 as shown in FIG. 4E.

A dipping process of immersing a part of the substrate 101 in which the protective metal layer 200 exposed in the water tank (not shown) containing the etching solution S reacting with the protective metal layer 200 is immersed Can be removed.

At this time, it is preferable that the etchant S use an etchant S that does not react with the gate and data pad terminal electrodes 128 and 129 formed under the protective metal layer 200.

As described above, the present invention forms the protective metal layer 200 in the non-display area NA where the gate and data pad terminal electrodes 128 and 129 of the array substrate 101 are formed in the TFT-LCD cell process And the color filter substrate 102 is completely cut by using the laser (160 in FIG. 4C), the breaking process can be eliminated, and a cutting burr is prevented from being generated on the cut surfaces of the substrates 101 and 102 can do.

Accordingly, it is possible to prevent the bezel area of the liquid crystal display device from being widened, and it is possible to prevent a cable (not shown), which is a signal transmission connection member for connecting between the circuit boards due to the cutting burr, from being damaged. This makes it possible to prevent the driving operation failure of the liquid crystal panel or the circuit part from being damaged.

The gate and data pad terminal electrodes 128 and 129 of the array substrate 101 formed with a larger area than the color filter substrate 102 are damaged by the laser LB irradiated to the color filter substrate 102 Can be prevented.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

101: array substrate, 102: color filter substrate
111: gate electrode, 113: gate insulating film
115: semiconductor layer 115a (active layer, 115b: ohmic contact layer)
117: source electrode, 119: drain electrode, 120:
121: protection film, 123: pixel electrode, 124: gate pad electrode, 125: data pad electrode
126: gate link wiring, 127: data link wiring, 128: gate pad terminal electrode
129: Data pad terminal electrode, 131: Black matrix, 133: Color filter, 135: Common electrode
150: liquid crystal layer, 160: laser oscillator, 200: protective metal layer
T: driving thin film transistor, AA: display region, NA: non-display region
P: pixel, GPA: gate pad part, DPA: data pad part

Claims (8)

Providing a first substrate and a second substrate on which a display area and a non-display area are defined;
Forming a protective metal layer on the non-display region of the first substrate;
Applying a sealant to the non-display area of one of the first substrate and the second substrate;
Attaching the first and second substrates together, and interposing a liquid crystal layer between the first and second substrates;
Curing the sealant to form a seal pattern;
Irradiating a laser from the upper portion of the second substrate to the outside of the seal pattern to cut the second substrate;
And removing the protective metal layer,
The non-display region is formed with a gate and a data pad electrode, a gate and a data link wiring, and a gate and a data pad electrode terminal. The protective metal layer is electrically connected to the gate and data pad electrodes, And covering the electrode terminal.
delete The method according to claim 1,
Wherein the protective metal layer comprises one selected from the group consisting of chromium (Cr), aluminum (Al), molybdenum (Mo), silver (Ag), and gold (Au) having a reflectance of 90% or more.
The method according to claim 1,
Wherein the protective metal layer is dipped in an etching liquid, or the etching liquid is sprayed to remove the protective metal layer.
5. The method of claim 4,
Wherein the etchant is made of a material that does not react with the gate and data pad terminal electrodes.
The method according to claim 1,
Wherein the first substrate is an array substrate in which thin film transistors are located at intersections of gate and data lines and the gate and data lines and the second substrate is a color filter substrate in which a color filter and a black matrix are formed in the display region, ≪ / RTI >
The method according to claim 1,
And cutting the second substrate includes irradiating a laser from the bottom of the first substrate to the outside of the non-display area to cut the first substrate.
The method according to claim 1,
Wherein the first and second substrates are formed of a plurality of unit cells, each of which is a liquid crystal panel including the seal pattern.
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