Source: https://patents.google.com/patent/KR101258129B1/en
Timestamp: 2020-01-27 06:07:51
Document Index: 555311073

Matched Legal Cases: ['art 142', 'art 142', 'art 142', 'art 142', 'art 142', 'art 142', 'art 142', 'art 142', 'art 142']

KR101258129B1 - Liquid crystal display, manufacturing method thereof, and repairing method thereof - Google Patents
Liquid crystal display, manufacturing method thereof, and repairing method thereof Download PDF
KR101258129B1
KR101258129B1 KR1020060071237A KR20060071237A KR101258129B1 KR 101258129 B1 KR101258129 B1 KR 101258129B1 KR 1020060071237 A KR1020060071237 A KR 1020060071237A KR 20060071237 A KR20060071237 A KR 20060071237A KR 101258129 B1 KR101258129 B1 KR 101258129B1
KR1020060071237A
KR20080010763A (en
2006-07-28 Application filed by 삼성디스플레이 주식회사 filed Critical 삼성디스플레이 주식회사
2006-07-28 Priority to KR1020060071237A priority Critical patent/KR101258129B1/en
2007-07-26 Priority claimed from US11/828,460 external-priority patent/US7855757B2/en
2008-01-31 Publication of KR20080010763A publication Critical patent/KR20080010763A/en
2013-04-25 Publication of KR101258129B1 publication Critical patent/KR101258129B1/en
An object of the present invention is to provide a liquid crystal display, a manufacturing method thereof, and a repair method that can obtain a wide viewing angle and improve a repair success rate.
A liquid crystal display according to the present invention includes: a gate line formed on a substrate; A data line intersecting the gate line and a gate insulating layer to form a pixel region; A thin film transistor connected to the gate line and the data line; A pixel electrode connected to the thin film transistor and formed in the pixel area; A first conductive pattern partially overlapping one side of the pixel electrode; A second conductive pattern partially overlapping the other side of the pixel electrode; A storage capacitor connected to one of the first and second conductive patterns, wherein one of the first and second conductive patterns partially overlaps a data line adjacent to one of one side and the other side of the pixel electrode; It is characterized by.
Liquid crystal display, its manufacturing method, and its repair method {LIQUID CRYSTAL DISPLAY, MANUFACTURING METHOD THEREOF, AND REPAIRING METHOD THEREOF}
1 is a plan view illustrating a thin film transistor substrate of a liquid crystal display according to a first exemplary embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating the thin film transistor substrate cut along the line II ′ of FIG. 1.
3 is a plan view illustrating a repair method of the liquid crystal display shown in FIG. 1.
4A and 4B are diagrams illustrating a comparison between before and after repairing a thin film transistor substrate of a liquid crystal display according to a first exemplary embodiment of the present invention.
5 is a plan view illustrating a thin film transistor substrate of a liquid crystal display according to a second exemplary embodiment of the present invention.
FIG. 6 is a plan view illustrating a repair method of the liquid crystal display shown in FIG. 5.
8A and 8B are views illustrating a comparison between before and after repairing a thin film transistor substrate of a liquid crystal display according to a second exemplary embodiment of the present invention.
9 is a plan view illustrating a thin film transistor substrate of a liquid crystal display according to a third exemplary embodiment of the present invention.
FIG. 10 is a plan view illustrating a repair method of the liquid crystal display shown in FIG. 9.
11A and 11B are diagrams for comparing and explaining before and after repairing a thin film transistor substrate of a liquid crystal display according to a third exemplary embodiment of the present invention.
101: substrate 102: gate line
104: data line 106: gate electrode
108: source electrode 110: drain electrode
112 gate insulating film 114 active layer
120,128: contact hole 122: pixel electrode
124,126: storage electrode 140,150: conductive pattern
142: line portion 144: protrusion
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, a method for manufacturing the same, and a repair method thereof, and more particularly, to a liquid crystal display device, a method for manufacturing the same, and a repair method capable of obtaining a wide viewing angle and improving a repair success rate.
A liquid crystal display device displays an image by adjusting the light transmittance of a liquid crystal having dielectric anisotropy using an electric field. In such a liquid crystal display, a plurality of gate lines and a plurality of data lines are formed in an intersecting structure, and pixels each driven by the thin film transistor are provided in each region defined by the intersecting structure. The pixel charges the difference voltage between the data signal supplied to the pixel electrode through the thin film transistor and the common voltage supplied to the common electrode of the color filter substrate, and drives the liquid crystal molecules according to the charging voltage to control the light transmittance, thereby adjusting the gray level according to the data signal. Implement
In the inspection process of the liquid crystal display, if a pixel defect is detected, the data line and the thin film transistor are separated, and the previous gate line used as the electrode of the capacitor in the shear storage capacitor method, and the pixel electrode are electrically connected by laser welding. . Accordingly, the gate-off voltage is applied to the pixel electrode through the previous gate line so that the pixel is repaired with dark lighting that is always dark.
However, the above-described repair process cannot be performed on a liquid crystal display having at least one of a polarizing plate having a discotic liquid crystal layer inserted therein and a high dielectric constant liquid crystal layer injected between the thin film transistor substrate and the color filter substrate to increase the viewing angle. Do.
A liquid crystal display device having a polarizing plate having a discotic liquid crystal layer inserted therein has a problem in that light passing through the polarizing plate is excessively changed due to the retardation of the discotic liquid crystal layer even when the defective pixel is repaired by the above-described method. Accordingly, the repaired defective pixel has a problem that is recognized by the user.
In addition, in the liquid crystal display having the high dielectric constant liquid crystal layer, a voltage higher than about 5V higher than the general gate-off voltage should be applied in order for the bad pixels to realize black.
Accordingly, an object of the present invention is to provide a liquid crystal display device, a method of manufacturing the same, and a method of repairing the same, which can obtain a wide viewing angle and improve a repair success rate.
According to an aspect of the present invention, there is provided a liquid crystal display comprising: a gate line formed on a substrate; A data line intersecting the gate line and a gate insulating layer to form a pixel region; A thin film transistor connected to the gate line and the data line; A pixel electrode connected to the thin film transistor and formed in the pixel area; A first conductive pattern overlapping one side of the pixel electrode; A second conductive pattern overlapping the other side of the pixel electrode; A storage capacitor connected to any one of the first and second conductive patterns, wherein one of the first and second conductive patterns overlaps a data line adjacent to any one of one side and the other side of the pixel electrode. It is characterized by.
Here, the first and second conductive patterns are formed on the same plane as the gate line and the same metal.
The pixel electrode may be supplied with a pixel signal from the data line adjacent to one side of the pixel electrode.
Meanwhile, the first conductive pattern is connected to a first storage electrode connected to the gate line, and the second conductive pattern is a line portion overlapping the other side of the pixel electrode, and the data adjacent to the other side of the pixel electrode. It is characterized in that it comprises a protrusion overlapping the line and is formed to float.
The first conductive pattern includes a line portion overlapping with one side of the pixel electrode and a protrusion portion overlapping with the data line adjacent to one side of the pixel electrode, and the second conductive pattern is floating. And a first storage electrode connected to the line.
In this case, the storage capacitor is characterized in that the first storage electrode, the second storage electrode connected to the pixel electrode overlaps with the gate insulating film interposed therebetween.
Further, at least one of the first and second conductive patterns and the pixel electrode are electrically connected to each other by at least one of the first and second conductive patterns through a laser beam irradiated at the overlapping portion of the pixel electrode. It is characterized by.
At this time, the line portion is characterized by having a line width larger than the diameter of the laser beam.
The liquid crystal display may further include a wide viewing angle polarizer positioned on the rear surface of the substrate.
The liquid crystal display may further include a liquid crystal layer having a high dielectric constant driven by an electric field formed between the pixel electrode and the common electrode facing the pixel electrode.
In order to achieve the above technical problem, a method of manufacturing a liquid crystal display according to the present invention includes a gate electrode, a gate line, a first storage electrode connected to the gate line, and a gate including first and second conductive patterns on a substrate. Forming a metal pattern; Forming a gate insulating film on the substrate on which the gate metal pattern is formed; Forming a semiconductor pattern including an active layer and an ohmic contact layer on the gate insulating layer; Forming a source / drain metal pattern including a source electrode, a drain electrode, and a data line on the substrate on which the semiconductor pattern is formed; Forming a passivation layer having a contact hole exposing the drain electrode on the substrate on which the source / drain metal pattern is formed; Forming a pixel electrode connected to the drain electrode on the passivation layer, one side of which overlaps the first conductive pattern and the other side of which overlaps the second conductive pattern, wherein any one of the first and second conductive patterns is formed; One of the first and second conductive patterns overlaps the data line adjacent to one of the one side and the other side of the pixel electrode, and one of the first and second conductive patterns is connected to the first storage electrode.
The method may further include forming a second storage electrode overlapping the first storage electrode and the gate insulating layer to form a storage capacitor when the source / drain metal pattern is formed.
In order to achieve the above technical problem, a repair method of a liquid crystal display according to the present invention includes a thin film transistor formed on a substrate, a pixel electrode connected to the thin film transistor and formed in a pixel region, and a first conductive layer overlapping one side of the pixel electrode. A pattern, a second conductive pattern overlapping the other side of the pixel electrode, a gate line connected to the thin film transistor, intersecting the gate line to form the pixel area, and overlapping at least one of the first and second conductive patterns Providing a liquid crystal display including a data line; Inspecting for a presence of a bad pixel of the liquid crystal display; Shorting an overlapping portion between the pixel electrode of the bad pixel detected through the inspection process and at least one of the first and second conductive patterns; And separating the pixel electrode and the thin film transistor of the defective pixel.
In some embodiments, the first conductive pattern may include a line portion overlapping one side of the pixel electrode and a protrusion overlapping the data line adjacent to one side of the pixel electrode. The second conductive pattern may include a line portion overlapping the other side of the pixel electrode, and a protrusion portion overlapping the data line adjacent to the other side of the pixel electrode.
In a second embodiment of providing the liquid crystal display, the first conductive pattern is included in the storage capacitor and is connected to a first storage electrode connected to the gate line, and the second conductive pattern is formed of the pixel electrode. And a line portion overlapping the other side, and a protrusion overlapping the data line adjacent to the other side of the pixel electrode.
In the third exemplary embodiment of the preparing of the liquid crystal display, the first conductive pattern includes a line portion overlapping with one side of the pixel electrode and a protrusion overlapping with a data line adjacent to one side of the pixel electrode. The second conductive pattern is formed in the storage capacitor and is connected to the first storage electrode connected to the gate line.
The shorting of the overlapping portion between the pixel electrode and at least one of the first and second conductive patterns may include the line portion and the pixel through a laser beam irradiated to the overlapping portion of the line portion and the pixel electrode. Characterized in that the step of allowing the electrodes to be electrically connected to each other.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 10B.
1 is a plan view showing a thin film transistor substrate according to the present invention, Figure 2 is a cross-sectional view showing a thin film transistor substrate cut along the line "I-I '" in FIG.
The thin film transistor substrate shown in FIGS. 1 and 2 has a gate line 102 and a data line 104 formed to intersect on the lower substrate 101 with a gate insulating layer 112 interposed therebetween, and the thin film transistor adjacent to the intersection portion. And a pixel electrode 122 formed in the pixel region provided in an intersecting structure, a storage capacitor Cst for preventing a change in pixel voltage charged in the pixel electrode 122, a pixel electrode 122 and a data line ( The first and second conductive patterns 140 and 150 overlap with the 104.
The gate line 102 supplies a scan signal to the gate electrode 106 of the thin film transistor. The data line 104 intersects the gate line 102 to provide a pixel area, and supplies the pixel signal to the source electrode 108 of the thin film transistor.
The thin film transistor causes a pixel signal supplied to the data line 104 to be charged and held in the pixel electrode 122 in response to a scan signal supplied to the gate line 102. For this purpose, the thin film transistor is connected to the pixel electrode 122 facing the gate electrode 106 connected to the gate line 102, the source electrode 108 connected to the data line 104, and the source electrode 108. The active layer 114 and the source electrode 108 overlapping the gate electrode 106 with the drain electrode 110 and the gate insulating layer 112 interposed therebetween to form a channel between the source electrode 108 and the drain electrode 110. And an ohmic contact layer 116 formed on the active layer 114 except for the channel portion for ohmic contact with the drain electrode 110.
Here, the semiconductor pattern including the active layer 114 and the ohmic contact layer 116 is formed to overlap the data line 104 and the second storage electrode 126 in the process. The drain electrode 110 includes a neck portion 110A facing the source electrode 108, and a head portion 110B connected to the pixel electrode 122 and extending from the neck portion 110A.
The pixel electrode 122 is connected to the drain electrode 110 exposed through the first contact hole 120 penetrating the passivation layer 118. The pixel electrode 122 charges a pixel signal supplied from the thin film transistor to generate a potential difference with a common electrode formed on a color filter substrate (not shown). Due to the potential difference, the liquid crystals positioned on the thin film transistor substrate and the color filter substrate are rotated by the dielectric anisotropy, and the amount of light incident through the pixel electrode 122 from the light source (not shown) is controlled to be transmitted to the color filter substrate. On the other hand, the liquid crystal uses a high dielectric constant anisotropic liquid crystal having a fast response speed even at a relatively low voltage. In addition, the polarizing plate positioned on the rear surface of the lower substrate 101 to polarize the light emitted from the light source uses a polarizing plate in which a discotic liquid crystal layer is inserted to obtain a wide viewing angle.
The storage capacitor Cst allows the pixel signal charged in the pixel electrode 122 to be stably maintained until the next pixel signal is charged. The storage capacitor Cst includes the first storage electrode 124 connected to the previous gate line 102 and the second storage electrode 126 connected to the pixel electrode 122 between the gate insulating layer 112. It is formed by overlapping. The first storage electrode 124 is formed of the same metal as the gate line 102 on the lower substrate 101. The second storage electrode 126 is formed of the same metal as the data line 104 on the same plane as the data line 104 and passes through the second contact hole 128 penetrating through the passivation layer 118. 122).
The first and second conductive patterns 140 and 150 have a floating structure. The first conductive pattern 140 overlaps the right side of the pixel electrode 122 and the current conductive data line 104 positioned on the right side of the pixel electrode 122. The second conductive pattern 150 is the pixel electrode. In addition to overlapping with the left side of 122, the data line 104 overlaps the previous or next stage data line 104 positioned on the left side of the pixel electrode 122. Each of the first and second conductive patterns 140 and 150 includes a line portion 142 overlapping the pixel electrode 122, and a protrusion 144 protruding from the line portion 142 and overlapping the data line 104. do.
The line part 142 is formed by the same mask process as the gate line 102, and is formed of the same metal as the gate line 102 on the lower substrate 101. The line part 142 overlaps each of the left and right sides of the pixel electrode 122 with the gate insulating layer 112 and the passivation layer 118 interposed therebetween to form a first parasitic capacitor Ca. The laser beam is irradiated to the overlapping portion between the line portion 142 and the pixel electrode 122 of the defective pixel detected through the inspection process. To this end, the line part 142 is formed to have a line width larger than the diameter of the laser beam and is connected to the pixel electrode 122 of the defective pixel during the repair process.
The protrusion 144 is formed of the same metal on the same plane as the line portion 142 by being formed by the same mask process as the line portion 142. The protrusion 144 of the first conductive pattern 140 overlaps the current terminal data line 104 positioned on the right side of the pixel electrode 122 with the gate insulating layer 112 and the passivation layer 118 interposed therebetween, thereby forming a second parasitic. Capacitor Cb is formed. The protrusion 144 of the second conductive pattern 150 overlaps the previous or next data line 104 positioned on the left side of the pixel electrode 122 with the gate insulating layer 112 and the protective layer 118 interposed therebetween. The second parasitic capacitor Cb is formed.
Meanwhile, the liquid crystal display shown in FIGS. 1 and 2 is formed by the following manufacturing method. Here, the manufacturing method of the liquid crystal display device will be described with reference to FIG. 2.
First, a gate metal pattern including a gate line 102, a gate electrode 106, a first storage electrode 124, and first and second conductive patterns 140 and 150 is formed on the lower substrate 101. The gate metal pattern is formed by forming a gate metal layer through a deposition method such as a sputtering method of the lower substrate 101, and then patterning the same by a photolithography process and an etching process.
The semiconductor pattern including the gate insulating layer 112, the active layer 114, and the ohmic contact layer 116 on the lower substrate 101 on which the gate metal pattern is formed, the data line 104, and the second storage electrode 126. The source / drain metal pattern including the source electrode 108 and the drain electrode 110 is stacked. The gate insulating layer 112 is formed by depositing an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), or the like on the lower substrate 101 on which the gate metal pattern is formed. The semiconductor pattern and the source / drain metal pattern are formed by forming an amorphous silicon layer, an n + amorphous silicon layer and a source / drain metal layer, and then patterning them through a photolithography process using a slit mask and a plurality of etching processes. As such, the semiconductor pattern and the source / drain metal pattern are simultaneously formed. In addition, after the semiconductor pattern is formed, a source / drain metal pattern may be formed on the substrate on which the semiconductor pattern is formed. That is, a semiconductor pattern is formed through a photolithography process and an etching process using a mask, and then a source / drain metal pattern is formed through a photolithography process and an etching process using a mask.
The passivation layer 118 is formed on the gate insulating layer 112 on which the source / drain metal pattern is formed, and the first and second contact holes 120 and 128 are formed. The passivation layer 118 is formed by stacking an inorganic insulating material, such as silicon oxide (SiOx), silicon nitride (SiNx), or an organic insulating material, such as an acrylic resin, on the gate insulating layer 112 on which the source / drain metal pattern is formed. The first and second contact holes 120 and 128 are formed by patterning the passivation layer 118 through a photolithography process and an etching process.
The pixel electrode 122 is stacked on the lower substrate 101 on which the passivation layer 118 and the first and second contact holes 120 and 128 are formed. The pixel electrode 122 is formed on the passivation layer 118 by forming a transparent conductive layer such as indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), or ITZO by a deposition method such as sputtering, and then a photolithography process. And by patterning in an etching process. The presence or absence of defects of a plurality of pixels included in the liquid crystal display device provided by the manufacturing method is inspected.
When a defective pixel is detected in the inspection process, a laser is formed on the overlapped portion A of the pixel electrode 122 of the defective pixel and the line portion 142 of the first and second conductive patterns 140 and 150, as shown in FIG. 3. The beam is irradiated to weld the pixel electrode 122 and the line portion 144 of the bad pixel. Accordingly, as illustrated in FIG. 4A, the first parasitic capacitor Ca including the pixel electrode 122 and the line portion 142 of the defective pixel is shorted as illustrated in FIG. 4B. Thereafter, the neck portion 110A and the head portion 110B of the drain electrode 110 of the thin film transistor are separated through the cutting (B) process to separate the thin film transistor and the pixel electrode 122. Therefore, the gate-off voltage Voff, which is floated on the pixel electrode 122 by the storage capacitor Cst, is formed in the protrusions 144 and the second conductive patterns 140 and 150 as shown in FIG. 4B. It is discharged through the previous or next data line 104 and the current data line 104 connected through the parasitic capacitor (Cb). As a result, the gate-off voltage Voff applied to the liquid crystal is continuously lowered so that the pixel is darkened to be displayed in black.
5 is a plan view illustrating a thin film transistor substrate according to a second exemplary embodiment of the present invention.
The thin film transistor substrate illustrated in FIG. 5 darkens a bad pixel through a second conductive pattern overlapping the previous or next data line as compared to the thin film transistor substrate illustrated in FIGS. 1 and 2, and the first conductive pattern Except that connected to the first storage electrode has the same component. Accordingly, detailed description of the same constituent elements will be omitted.
The storage capacitor Cst allows the pixel voltage signal charged in the pixel electrode 122 to be stably maintained until the next pixel signal is charged. The storage capacitor Cst includes the first storage electrode 124 connected to the previous gate line 102 and the second storage electrode 126 connected to the pixel electrode 122 between the gate insulating layer 112. It is formed by overlapping.
The second storage electrode 126 is formed of the same metal as the data line 104 on the same plane as the data line 104 and passes through the second contact hole 128 penetrating through the passivation layer 118. 122).
The first storage electrode 124 overlaps the first conductive pattern 140 extending in the vertical direction from the first storage electrode 124. The first conductive pattern 140 overlaps the right side of the pixel electrode 122 and is formed of the same metal as the gate line 102 on the lower substrate 101. The area 124 of the first storage electrode connected to the first conductive pattern 140 is relatively wider than the first storage electrode 124 shown in FIGS. 1 and 2 by the first conductive pattern 140. All. Accordingly, the capacitance value of the storage capacitor Cst illustrated in FIGS. 5 and 7A, which is proportional to the area of the first storage electrode 124, may be compared with the capacitance value of the storage capacitor Cst illustrated in FIGS. 1 and 2. Relatively large. In this case, if the capacity value of the storage capacitor Cst shown in FIGS. 5 and 7A is the same as the capacity value of the storage capacitor shown in FIGS. 1 and 2, the first and the first included in the storage capacitor Cst are included. The overlapping area of the two storage electrodes 124 and 126 may be reduced. The opening ratio is improved by the overlapped area of the reduced first and second storage electrodes 124 and 126.
Meanwhile, in an area corresponding to the first conductive pattern 140 to which the gate-off voltage Voff is supplied through the first storage electrode 124 connected to the gate line 102, disclination differs from other areas. Since the change occurs, the left viewing angle light leakage phenomenon may occur. To prevent this, the width of the black matrix (not shown) overlapping the first conductive pattern 140 should be increased. In this case, the black matrix increases in area much less than the overlap area reduction of the first and second storage electrodes 124 and 126, thereby preventing the decrease in the aperture ratio by the black matrix.
In addition, the second conductive pattern 150 formed in a floating structure facing the first conductive pattern 140 includes a line portion 142 and a protrusion 144. The line portion 142 overlaps with the left side of the pixel electrode 122, and the protrusion 144 protrudes from the line portion 142 to be positioned at the left or right edge of the pixel electrode 122. Overlaps with
The line part 142 is formed of the same metal as the gate line 102 on the lower substrate 101. The line part 142 overlaps the left side of the pixel electrode 122 with the gate insulating layer 112 and the passivation layer 118 interposed therebetween to form a first parasitic capacitor Ca. The laser beam is irradiated to the overlapping portion between the line portion 142 and the pixel electrode 122 of the defective pixel detected through the inspection process. To this end, the line part 142 is formed to have a line width larger than the diameter of the laser beam and is connected to the pixel electrode 122 of the defective pixel during the repair process.
The protrusion 144 is formed of the same metal on the same plane as the line portion 142. The protrusion 144 overlaps the previous or next data line 104 positioned on the left side of the pixel electrode 122 with the gate insulating layer 112 and the passivation layer 118 interposed therebetween, thereby forming a second parasitic capacitor Cb. Is formed.
When a defective pixel is detected in the inspection process, a laser beam is irradiated to the overlapped portion A of the pixel electrode 122 of the defective pixel and the line portion 142 of the second conductive pattern 150 as illustrated in FIG. 6. The pixel electrode 122 and the line portion 142 of the second conductive pattern 150 are welded. Accordingly, as illustrated in FIG. 7A, the first parasitic capacitor Ca including the pixel electrode 122 and the line portion 142 of the second conductive pattern 150 may be shorted as illustrated in FIG. 7B. do. Thereafter, the neck portion 110A and the head portion 110B of the drain electrode 110 of the thin film transistor are separated through the cutting (B) process to separate the thin film transistor and the pixel electrode 122. Therefore, the gate-off voltage Voff, which is floated on the pixel electrode 122 by the storage capacitor Cst, is connected to the previous end connected through the protrusion 144 of the second conductive pattern 150 and the second parasitic capacitor Cb. The next stage is discharged through the data line 104. As a result, the gate-off voltage Voff applied to the liquid crystal is continuously lowered so that the pixel is darkened to be displayed in black.
8 is a plan view illustrating a thin film transistor substrate according to a third exemplary embodiment of the present invention.
The thin film transistor substrate shown in FIG. 8 darkens the defective pixel through a first conductive pattern overlapping the current line data line as compared to the thin film transistor substrate shown in FIG. 5, and the second conductive pattern is formed by the first storage electrode. It has the same components except that it is connected. Accordingly, detailed description of the same constituent elements will be omitted.
The first storage electrode 124 overlaps the second conductive pattern 150 extending in the vertical direction from the first storage electrode 124. The second conductive pattern 150 overlaps the left side of the pixel electrode 122 and is formed of the same metal as the gate line 102 on the lower substrate 101. The area 124 of the first storage electrode connected to the second conductive pattern 150 is relatively wider than the first storage electrode 124 shown in FIGS. 1 and 2 by the second conductive pattern 150. All. Accordingly, the capacitance value of the storage capacitor Cst illustrated in FIGS. 8 and 10A, which is proportional to the area of the first storage electrode 124, may be compared with the capacitance value of the storage capacitor Cst illustrated in FIGS. 1 and 2. Relatively large. In this case, when the capacity value of the storage capacitor Cst shown in FIGS. 8 and 10A is the same as the capacity value of the storage capacitor shown in FIGS. 1 and 2, the first and the first included in the storage capacitor Cst are included. The overlapping area of the two storage electrodes 124 and 126 may be reduced. The opening ratio is improved by the overlapped area of the reduced first and second storage electrodes 124 and 126.
On the other hand, in the region corresponding to the second conductive pattern 150 to which the gate-off voltage Voff is supplied through the first storage electrode 124 connected to the gate line 102, disclination differs from other regions. As the change occurs, a right angle of view light leakage phenomenon may occur. In order to prevent this, the width of the black matrix (not shown) overlapping the second conductive pattern 150 should be increased. In this case, the black matrix increases in area much less than the overlap area reduction of the first and second storage electrodes 124 and 126, thereby preventing the decrease in the aperture ratio by the black matrix.
In addition, the first conductive pattern 140 formed in a floating structure facing the second conductive pattern 150 includes a line portion 142 and a protrusion 144. The line portion 142 overlaps the right side of the pixel electrode 122, and the protrusion 144 protrudes from the line portion 142 and overlaps the current end data line 104 positioned on the right side of the pixel electrode 122. .
The line part 142 is formed of the same metal as the gate line 102 on the lower substrate 101. The line part 142 overlaps the right side of the pixel electrode 122 with the gate insulating layer 112 and the passivation layer 118 interposed therebetween to form a first parasitic capacitor Ca. The laser beam is irradiated to the overlapping portion between the line portion 142 and the pixel electrode 122 of the defective pixel detected through the inspection process. To this end, the line part 142 is formed to have a line width larger than the diameter of the laser beam and is connected to the pixel electrode 122 of the defective pixel during the repair process.
The protrusion 144 is formed of the same metal on the same plane as the line portion 142. The protrusion 144 overlaps the current terminal data line 104 positioned on the right side of the pixel electrode 122 with the gate insulating layer 112 and the passivation layer 118 interposed therebetween, thereby forming a second parasitic capacitor Cb. .
When a defective pixel is detected in the inspection process, a laser beam is irradiated to the overlapping portion A of the pixel electrode 122 of the defective pixel and the line portion 142 of the first conductive pattern 140 as illustrated in FIG. 9. The pixel electrode 122 and the line portion 142 of the first conductive pattern 140 are welded. Accordingly, as illustrated in FIG. 10A, the first parasitic capacitor Ca including the pixel electrode 122 and the line portion 142 of the first conductive pattern 140 may be shorted as illustrated in FIG. 10B. do. Thereafter, the neck portion 110A and the head portion 110B of the drain electrode 110 of the thin film transistor are separated through the cutting (B) process to separate the thin film transistor and the pixel electrode 122. Accordingly, the gate-off voltage Voff, which is floated on the pixel electrode 122 by the storage capacitor Cst, is the current stage data connected through the protrusion 144 of the first conductive pattern 140 and the second parasitic capacitor Cb. Discharged through line 104. As a result, the gate-off voltage Voff applied to the liquid crystal is continuously lowered so that the pixel is darkened to be displayed in black.
Meanwhile, the thin film transistor substrate illustrated in FIG. 1 including the first and second conductive patterns 140 and 150 may have the current stage data line 104 and the previous stage or the next stage through the second parasitic capacitor Cb after the repair process. The floating gate off voltage Voff swings along the data signal from the data line 104. In this case, when data signals of different polarities are supplied through the current data line 104 and the previous or next data line 104, the data signals of different polarities are canceled with each other and the data line 104 is cancelled. The discharge effect of the gate-off voltage Voff through is weak.
The thin film transistor substrate illustrated in FIG. 5 including the second conductive pattern 150 overlapping the previous or next data line 104 may be moved to the previous or next stage through the second parasitic capacitor Cb after the repair process. However, the floating gate off voltage Voff swings along the data signal from the data line 104. In this case, when data signals of different polarities are supplied through the current data line 104 and the previous or next data line 104, the gate-off voltage Voff floating on the pixel electrode 122 is Swing with the opposite polarity to the current data line 104.
On the other hand, the thin film transistor substrate illustrated in FIG. 8 including the first conductive pattern 140 overlapping the current data line 104 has the current data line 104 through the second parasitic capacitor Cb after the repair process. The floating gate off voltage Voff swings along with the data signal from. Accordingly, the thin film transistor substrate illustrated in FIG. 8 is applied to the gate-off voltage Voff floated on the pixel electrode 122 through the second parasitic capacitor Cb as compared to the thin film transistor substrate illustrated in FIGS. 1 and 5. Affected data signal value is relatively small.
As described above, the liquid crystal display according to the present invention, a method for manufacturing the same, and a method for repairing the same according to the present invention are characterized in that the gate-off voltage plotted on the pixel electrode by the storage capacitor is at least one of the protrusions and the second conductive patterns. It is discharged through data lines connected through parasitic capacitors. Accordingly, the liquid crystal display according to the present invention, the manufacturing method thereof, and the repair method thereof can be repaired in a structure having a wide viewing angle polarizing plate and a high dielectric constant liquid crystal layer.
In addition, the liquid crystal display according to the present invention, a manufacturing method thereof, and a repair method thereof increase the storage capacitor capacitance value by connecting one of the first and second conductive patterns to the storage electrode. In this case, if the capacitance value of the storage capacitor according to the present invention is the same as that of the conventional one, the area of the storage electrode can be reduced, and the aperture ratio is improved by the decrease of the area.
A data line crossing the gate line and a gate insulating layer therebetween;
A first conductive pattern partially overlapping one side of the pixel electrode;
A second conductive pattern partially overlapping the other side of the pixel electrode;
A storage capacitor including a first storage electrode connected to the gate line and a second storage electrode connected to the pixel electrode and overlapping the first storage electrode with the gate insulating layer interposed therebetween,
One of the first and second conductive patterns partially overlaps the data line adjacent to any one of one side and the other side of the pixel electrode.
And the first and second conductive patterns are formed on the same plane as the gate line and made of the same metal.
And a pixel signal from the data line adjacent to one side of the pixel electrode is supplied to the pixel electrode.
The first conductive pattern is connected to the first storage electrode,
And the second conductive pattern includes a line portion overlapping the other side of the pixel electrode and a protrusion portion overlapping the data line adjacent to the other side of the pixel electrode.
The first conductive pattern includes a line portion overlapping with one side of the pixel electrode and a protrusion overlapping with the data line adjacent to one side of the pixel electrode, and is formed to be floated.
And the second conductive pattern is connected to the first storage electrode.
And the storage capacitor is connected to any one of the first and second conductive patterns.
At least one of the first and second conductive patterns and the pixel electrode are electrically connected to each other by a laser beam that is irradiated upon repairing at least one of the first and second conductive patterns and the overlapping portion of the pixel electrode. Liquid crystal display device.
At least one of the first and second conductive patterns has a line width larger than the diameter of the laser beam.
And a wide viewing angle polarizer positioned on the back surface of the substrate.
And a liquid crystal layer having a high dielectric constant driven by an electric field formed between the pixel electrode and the common electrode facing the pixel electrode.
Forming a gate metal pattern on the substrate, the gate metal pattern including a gate electrode, a gate line, a first storage electrode connected to the gate line, and first and second conductive patterns;
Forming a gate insulating film on the substrate on which the gate metal pattern is formed;
Forming a semiconductor pattern including an active layer and an ohmic contact layer on the gate insulating layer;
Forming a source and a drain metal pattern including a source electrode, a drain electrode, and a data line on the substrate on which the semiconductor pattern is formed;
Forming a protective film having a contact hole exposing the drain electrode on the substrate on which the source and drain metal patterns are formed;
Forming a pixel electrode connected to the drain electrode on the passivation layer, one side of which partially overlaps the first conductive pattern and the other side of which partially overlaps the second conductive pattern;
One of the first and second conductive patterns partially overlaps a data line adjacent to any one of one side and the other side of the pixel electrode,
Any one of the first and second conductive patterns is connected to the first storage electrode.
And the second conductive pattern includes a line portion overlapping the other side of the pixel electrode and a protrusion overlapping the data line adjacent to the other side of the pixel electrode.
And forming a second storage electrode overlapping the first storage electrode and the gate insulating layer to form a storage capacitor when the source and drain metal patterns are formed, the second storage electrode connected to the pixel electrode. Method of manufacturing the device.
A repair step of causing at least one of the first and second conductive patterns and the pixel electrode to be electrically connected to each other by at least one of the first and second conductive patterns and a laser beam radiated to an overlapping portion of the pixel electrode; The manufacturing method of the liquid crystal display device characterized by including further.
A thin film transistor formed on a substrate, a pixel electrode connected to the thin film transistor, a first conductive pattern partially overlapping with one side of the pixel electrode, a second conductive pattern partially overlapping with the other side of the pixel electrode, and connected to the thin film transistor A gate line, a data line intersecting the gate line and partially overlapping at least one of the first and second conductive patterns, and a first storage electrode connected to the gate line, the first storage electrode, and a gate insulating layer. Providing a liquid crystal display device including a storage capacitor including a second storage electrode connected to the pixel electrode and overlapping with the second electrode;
Inspecting for a presence of a bad pixel of the liquid crystal display;
Shorting an overlapping portion between the pixel electrode of the bad pixel detected through the inspection process and at least one of the first and second conductive patterns;
And separating the pixel electrode and the thin film transistor of the defective pixel.
In preparing the liquid crystal display device
The first conductive pattern includes a line portion overlapping with one side of the pixel electrode and a protrusion portion overlapping with the data line adjacent to one side of the pixel electrode.
And the storage capacitor is connected to either one of the first and second conductive patterns.
The first conductive pattern includes a line portion overlapping with one side of the pixel electrode and a protrusion overlapping with a data line adjacent to one side of the pixel electrode, and is formed to be floated.
The second conductive pattern is connected to the first storage electrode.
The method according to any one of claims 17, 19 and 20,
Shorting an overlapping portion between the pixel electrode and at least one of the first and second conductive patterns may be performed.
At least one of the first and second conductive patterns and the pixel electrode are electrically connected to each other by at least one of the first and second conductive patterns and a laser beam irradiated to an overlapping portion of the pixel electrode. The repair method of the liquid crystal display device characterized by the above-mentioned.
KR1020060071237A 2006-07-28 2006-07-28 Liquid crystal display, manufacturing method thereof, and repairing method thereof KR101258129B1 (en)
KR1020060071237A KR101258129B1 (en) 2006-07-28 2006-07-28 Liquid crystal display, manufacturing method thereof, and repairing method thereof
CN 200710136150 CN101114093B (en) 2006-07-28 2007-07-19 Liquid crystal display, method of manufacturing the same, and method of repairing the same
US11/828,460 US7855757B2 (en) 2006-07-28 2007-07-26 Liquid crystal display, method of manufacturing the same, and method of repairing the same
KR20080010763A KR20080010763A (en) 2008-01-31
KR101258129B1 true KR101258129B1 (en) 2013-04-25
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KR101831223B1 (en) 2011-11-03 2018-02-23 삼성디스플레이 주식회사 Display substrate and method of fabricating the same
KR102037360B1 (en) * 2013-08-30 2019-10-28 엘지디스플레이 주식회사 Display device and method for manufacturing of the same
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2007-07-19 CN CN 200710136150 patent/CN101114093B/en active IP Right Grant
KR20080010763A (en) 2008-01-31
CN101114093A (en) 2008-01-30
CN101114093B (en) 2011-05-25
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