KR20110084707A - Liquid crystal display and repari method thereof - Google Patents

Abstract

PURPOSE: A liquid crystal display device and a method for repairing the same are provided to repair a sub pixel of the liquid crystal display device. CONSTITUTION: A liquid crystal display device comprises a gate line which transfers a gate signal, a common voltage line which transfers a common voltage, a data line which crosses the gate line and transfers data signal, a switching element which is connected to the gate line and the data line, a pixel electrode which is connected to the switching element, and a repair member(2000) which is placed between the common voltage line and the pixel electrode.

Description

Liquid crystal display and its repair method {LIQUID CRYSTAL DISPLAY AND REPARI METHOD THEREOF}

The present invention relates to a liquid crystal display and a repair method thereof.

2. Description of the Related Art [0002] A liquid crystal display device is one of the most widely used flat panel display devices, and includes two display panels having field generating electrodes such as a pixel electrode and a common electrode, and a liquid crystal layer interposed therebetween. The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrode, thereby determining an orientation of liquid crystal molecules of the liquid crystal layer and controlling the polarization of incident light to display an image.

The liquid crystal layer includes a liquid crystal material having refractive anisotropy, and due to the refractive anisotropy of the liquid crystal material, the change in color and the contrast ratio are large depending on the angle of view of the liquid crystal display, so that the viewing angle is narrow, and thus the side visibility may be inferior to the front visibility. have. To solve this problem, a method of dividing one pixel electrode into two subpixel electrodes and different voltages applied to the two subpixel electrodes has been proposed. Each subpixel electrode is connected to a thin film transistor which is a three-terminal device for switching the applied voltage.

If foreign materials are involved in the manufacturing process of the liquid crystal display or the exposure apparatus used to form the photosensitive film for forming the pattern of the conductive layer is not in focus, a defect occurs in the channel of the thin film transistor so that the data voltage is not applied to the subpixel electrode. Even if it should not be, the data voltage is applied may cause a display failure.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method for repairing a defective subpixel in a liquid crystal display device in which one pixel includes two subpixels, and a liquid crystal display device thereby.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a gate line transferring a gate signal, a common voltage line transferring a common voltage, a data line crossing the gate line and transferring a data signal, and connected to the gate line and the data line. A switching element, a pixel electrode connected to the switching element, and a repair member disposed between the common voltage line and the pixel electrode, and one end of the repair member overlaps a part of the gate line or a part of the data line. It is desirable to do it.

It is preferable that another part of the gate line or another part of the data line overlaps a part of the common voltage line.

Preferably, another part of the gate line or another part of the data line overlaps a part of the pixel electrode.

One end of the repair member preferably overlaps a portion of the gate line or a portion of the data line by a diameter of 4 to 6 mu m.

The gate line may include a first gate line and a second gate line parallel to each other, the pixel electrode may include a first subpixel electrode and a second subpixel electrode, and the switching element may include the first subpixel electrode. A first switching element including a first drain electrode connected to the first drain electrode and a first source electrode facing the first drain electrode, a second drain electrode connected to the second subpixel electrode, and the second drain electrode A third switching element including a second source electrode facing the third source electrode, a third source electrode connected to the second drain electrode, and a third drain electrode facing the third source electrode; And a transformer capacitor including the third drain electrode and the common voltage line as two terminals, wherein the repair member is disposed between the first gate line and the second gate line. It is preferable that one end of the repair member overlaps with the third drain electrode.

It is preferable that the other end part of the said repair member overlaps with a part of said 2nd subpixel electrode.

The third drain electrode preferably has a repair portion extending in the horizontal direction, and the repair portion overlaps one end of the repair member.

Preferably, a first gate line is connected to the first switching element and the second switching element, and the second gate line is connected to the third switching element.

The gate-off voltage Voff is applied to the second gate line when the gate-on voltage Von is applied to the first gate line, and the gate-on voltage Von is applied to the second gate line. It is preferable that a gate off voltage Voff is applied to one gate line.

When the gate-on voltage Von is applied to the second gate line, the voltages of the first subpixel electrode and the second subpixel electrode are different.

In addition, the liquid crystal display according to another exemplary embodiment of the present invention may include a repair member and a first gate line formed between the first and second gate lines parallel to each other, and the first and second gate lines. And a data line intersecting the second gate line and a pixel arranged in a matrix form, wherein the pixel includes a first drain connected to the first subpixel electrode, the second subpixel electrode, and the first subpixel electrode. A first switching element comprising an electrode and a first source electrode facing the first drain electrode, a second drain electrode connected to the second subpixel electrode, and a second source facing the second drain electrode A third switching element including a second switching element including an electrode, a third source electrode connected to the second drain electrode, and a third drain electrode facing the third source electrode; And a transformer capacitor including two terminals, a common voltage line transferring the third drain electrode and a common voltage, wherein one end of the repair member overlaps the third drain electrode, and the second drain electrode is disconnected. Preferably, the two terminals of the transformer capacitor are shorted to each other, one end of the repair member is shorted to the third drain electrode, and the other end of the repair member is shorted to the second subpixel electrode. .

It is preferable that the other end part of the said repair member overlaps with a part of said 2nd subpixel electrode.

The third drain electrode preferably has a repair portion extending in the horizontal direction, and the repair portion overlaps one end of the repair member.

Preferably, the common voltage is transmitted to the second subpixel electrode.

In addition, a repair method of a liquid crystal display according to an exemplary embodiment of the present invention may include a repair member formed between a first gate line and a second gate line parallel to each other, and the first gate line and the second gate line. Data lines intersecting the first gate line and the second gate line, and pixels arranged in a matrix form, wherein the pixels are connected to a first subpixel electrode, a second subpixel electrode, and the first subpixel electrode. A first switching element including a first drain electrode and a first source electrode facing the first drain electrode, a second drain electrode connected to the second subpixel electrode, and facing the second drain electrode A third switching element including a second source electrode, a third source electrode connected to the second drain electrode, and a third drain electrode facing the third source electrode And a switching capacitor including a switching element and a common voltage line for transmitting the common voltage and the third drain electrode as two terminals, and one end of the repair member overlaps the third drain electrode. The method may include: disconnecting the second drain electrode, shorting two terminals of the transformer capacitor with each other, shorting one end of the repair member with the third drain electrode, and a second end of the repair member. A repair method of a liquid crystal display device comprising shorting a subpixel electrode.

It is preferable that the other end of the repair member overlaps a part of the second subpixel electrode.

Preferably, the third drain electrode has a repair portion extending in the horizontal direction, and the repair portion overlaps one end of the repair member.

Preferably, the common voltage is transmitted to the second subpixel electrode.

According to an exemplary embodiment of the present invention, the drain capacitor of the second thin film transistor of the subpixel of the defective liquid crystal display device is disconnected and the transformer capacitor is connected to the second unit by using a repair member positioned between the first gate line and the second gate line. The pixel may be repaired by shorting the pixel electrode such that a common voltage is applied to the second subpixel electrode.

1 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.
2 is a diagram illustrating a gate signal of a liquid crystal display according to an exemplary embodiment of the present invention.
3 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of the liquid crystal display shown in FIG. 3.
FIG. 5 is a cross-sectional view of the liquid crystal display of FIGS. 3 and 4 taken along the line VV.
6 is a layout view of a liquid crystal display according to another exemplary embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. On the contrary, when a part is "just above" another part, there is no other part in the middle.

1 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a liquid crystal display according to an exemplary embodiment may include a signal line including a first gate line 121, a second gate line 123, a common voltage line 125, and a data line 171. It includes a plurality of pixels (PX) connected thereto.

The pixel PX includes a first switching element Qh, a second switching element Ql, a third switching element Qc, a first liquid crystal capacitor Clch, a second liquid crystal capacitor Clcl, and a transformer capacitor Cstd. ).

The first switching element Qh and the second switching element Ql are three-terminal elements, such as a thin film transistor, provided in the lower panel 100, and a control terminal thereof is connected to the first gate line 121. The input terminal is connected to the data line 171, and the output terminal is connected to the first liquid crystal capacitor Clch and the second liquid crystal capacitor Clcl, respectively.

The third switching element Qc is also a three-terminal element such as a thin film transistor provided in the lower panel 100, the control terminal is connected to the second gate line 123, and the input terminal is the second liquid crystal capacitor Clcl. ) And the output terminal is connected to the transformer capacitor (Cstd).

The transformer capacitor Cstd is connected to the output terminal of the third switching element Qc and the common voltage line 125, and the output of the common voltage line 125 and the third switching element Qc included in the lower display panel 100. Terminals overlap each other with insulators in between.

The operation of the liquid crystal display according to the exemplary embodiment of the present invention will be described with reference to FIG. 2 along with FIG. 1 described above.

2 is a diagram illustrating a gate signal Vgn of the first gate line 121 and a gate signal Vgc of the second gate line 123 in the liquid crystal display illustrated in FIG. 1.

When the gate-on voltage Von is applied to the first gate line 121, the first switching element Qh and the second switching elements Qh and Ql connected thereto are turned on.

Accordingly, the data voltage of the data line 171 is equally applied to the first and second subpixel electrodes 191h and 191l (see FIG. 3) through the turned on first and second switching elements Qh and Ql. Since the first and second liquid crystal capacitors Clch and Clcl are charged by the voltage difference between the common voltage Vcom of the common electrode 270 and the first and second subpixel electrodes 191h and 191l, the first liquid crystal capacitor Clch ) And the charging voltage of the second liquid crystal capacitor Clcl are also the same. In this case, a gate off voltage Voff is applied to the second gate line 123.

Next, when the gate-off voltage Von is applied to the second gate line 123 or after the gate-off voltage Voff is applied to the first gate line 121, the first gate line 121 is connected to the first gate line 121. The first and second switching elements Qh and Ql are turned off and the third switching element Qc is turned on. Accordingly, the charge of the second subpixel electrode 191l connected to the output terminal of the second switching element Ql flows into the transformer capacitor Cstd, so that the voltage of the second liquid crystal capacitor Clcl drops.

In particular, when the liquid crystal display according to the present exemplary embodiment is driven by frame inversion, when a data voltage having a positive polarity is applied to the data line 171 based on the common voltage Vcom in the current frame. For example, since the negative charge is collected in the transformer capacitor Cstd after the previous frame ends, when the third switching element Qc is turned on in the current frame, the amount of the second subpixel electrode 191l is positive. Positive charge flows into the transformation capacitor Cstd through the third switching element Qc and negative charge of the transformation capacitor Cstd flows into the second subpixel electrode 191l, so that the second The voltage of the subpixel electrode 191l drops. In the next frame, when the third switching element Qc is turned on while the second subpixel electrode 191l is charged with negative charge, the negative charge of the second subpixel electrode 191l is negative. Negative charge flows into the transformer capacitor Cstd, and negative charges are collected in the transformer capacitor Cstd, and the voltage of the second liquid crystal capacitor Clcl drops.

As such, the side visibility of the liquid crystal display may be improved by changing the charging voltages of the first and second liquid crystal capacitors Clch and Clcl.

Next, a liquid crystal display and a manufacturing method thereof according to an exemplary embodiment of the present invention will be described with reference to FIGS. 3 to 5.

3 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 4 is an enlarged view of a portion of the liquid crystal display shown in FIG. 3, and FIG. 5 is a view of the liquid crystal display of FIGS. 3 and 4. It is sectional drawing cut along the VV line.

The liquid crystal display according to the present exemplary embodiment includes a lower panel 100 and an upper panel 200 facing each other, and a liquid crystal layer 3 interposed between the two display panels 100 and 200. Polarizers (not shown) may be provided on the outer surfaces of the display panels 100 and 200.

First, the upper panel 200 will be described. The common electrode 270 may be formed on the insulating substrate 210, and an alignment layer (not shown) may be formed on the common electrode 270.

The liquid crystal layer 3 includes liquid crystal molecules having negative dielectric anisotropy, and the liquid crystal molecules may be aligned such that their major axes are perpendicular to the surfaces of the two display panels 100 and 200 in the absence of an electric field.

Next, the lower panel 100 will be described. A plurality of first gate lines 121, a plurality of second gate lines 123, a common voltage line 125, and a repair member may be disposed on the insulating substrate 110. A plurality of gate conductors including 2000 are formed.

The first gate line 121 and the second gate line 123 mainly extend in the horizontal direction and transmit a gate signal. The first gate line 121 includes a first gate electrode 124h protruding upward and a second gate electrode 124l, and the second gate line 123 includes a third gate electrode 124c protruding upward. do. The first gate electrode 124h and the second gate electrode 124l are connected to each other to form one protrusion.

The common voltage line 125 may include an electrode 129 protruding up and down, a pair of vertical portions 128 and a pair of vertical portions 128 extending downward substantially perpendicularly to the first gate line 121. It includes a horizontal portion 127 connected to each other. The horizontal portion 127 includes an extension 126 extended downward.

The repair member 2000 is positioned between the first gate line 121 and the second gate line 123, and is part of the repair member 2000 between the first gate line 121 and the third gate electrode 124c. Is located.

A gate insulating layer 140 is formed on the gate conductors 121, 123, and 125.

A plurality of linear semiconductors 151, which may be made of amorphous or crystalline silicon, are formed on the gate insulating layer 140. The linear semiconductor 151 mainly extends in the longitudinal direction and extends toward the first and second gate electrodes 124h and 124l and is connected to each other, and the first and second semiconductors 154h and 154l and the second semiconductor ( And a third semiconductor 154c connected to 154l.

A plurality of linear ohmic contacts 161 are formed on the linear semiconductor 151, and a pair of ohmic contacts 163h and 165h are formed on the first semiconductor 154h. A pair of ohmic contacts (not shown) are formed on each of the first and second semiconductors 154l and 154c. The ohmic contact 163h is connected to the linear ohmic contact 161.

The plurality of data lines 171, the plurality of first drain electrodes 175h, the plurality of second drain electrodes 175l, and the plurality of third source electrodes 173c are disposed on the ohmic contacts 161 and 165h. And a plurality of third drain electrodes 175c are formed.

The data line 171 transmits a data signal and mainly extends in a vertical direction to cross the first gate line 121 and the second gate line 123. Each data line 171 includes a first source electrode 173h and a second source electrode 173l extending toward the first gate electrode 124h and the second gate electrode 124l. The first source electrode 173h and the second source electrode 173l are connected to each other.

The first drain electrode 175h, the second drain electrode 175l, and the third drain electrode 175c include one wide end portion and the other end portion having a rod shape. The rod-shaped end portions of the first drain electrode 175h and the second drain electrode 175l are partially surrounded by the first source electrode 173h and the second source electrode 173l, respectively, and the third source electrode 173c is also It is partially surrounded by the third source electrode 173c. One wide end portion of the second drain electrode 175l is connected to the third source electrode 173c. The wide end portion 177c of the third drain electrode 175c overlaps the extension 126 of the common voltage line 125 to form a transformer capacitor Cstd.

In this case, the third drain electrode 175c overlaps one end of the repair member 2000. One end of the repair member 2000 preferably overlaps the third drain electrode 175c by a diameter of 4 to 6 μm. Since the diameter of the laser beam is 2 μm, when the diameter of the overlapping portion is smaller than 4 μm, the laser beam may be irradiated elsewhere and defects may occur. When the diameter of the overlapping portion is larger than 6 μm, the aperture ratio decreases. Can be.

First / second / third gate electrodes 124h / 124l / 124c, first / second / third source electrodes 173h / 173l / 173c and first / second / third drain electrodes 175h / 175l / 175c) forms one first / second / third thin film transistor TFT (Qh / Ql / Qc) together with the first / second / third semiconductors 154h / 154l / 154c. The channel of the thin film transistor is formed in each semiconductor 154h / 154l / 154c between each source electrode 173h / 173l / 173c and each drain electrode 175h / 175l / 175c.

The linear semiconductor 151 including the semiconductors 154h, 154l, and 154c may include the data conductors 171, except for the channel region between the source electrodes 173h, 173l and 173c and the drain electrodes 175h, 175l, and 175c. 175h, 175l, and 175c and the resistive contact members 161 and 165h at the bottom thereof. That is, the linear semiconductor 151 including the semiconductors 154h, 154l, and 154c includes the data conductors 171, 175h, and 175l as well as between the source electrodes 173h, 173l, and 173c and the drain electrodes 175h, 175l, and 175c. , 175c) is the part exposed.

A lower passivation layer 180p may be formed on the data conductors 171, 175h, 175l, and 175c and the exposed semiconductors 154h, 154l, and 154c, which may be made of an inorganic insulator such as silicon nitride or silicon oxide. The color filter 230 is positioned on the 180.

The light blocking member 220 is positioned on a region where the color filter 230 is not located and a portion of the color filter 230. The light blocking member 220 includes a portion covering a region where the first thin film transistor Qh, the second thin film transistor Ql, the third thin film transistor Qc, and the like are positioned, and a portion extending along the data line 171. .

An upper passivation layer 180q is formed on the color filter 230 and the light blocking member 220.

In the lower passivation layer 180p and the upper passivation layer 180q, a plurality of contact holes 185h and 185l exposing the wide end portion of the first drain electrode 175h and the wide end portion of the second drain electrode 175l are formed, respectively. The contact hole 184 exposing the extension 126 of the common voltage line 125 is formed.

The pixel electrode including the first subpixel electrode 191h and the second subpixel electrode 191l is formed on the upper passivation layer 180q.

The overall shape of the first subpixel electrode 191h is quadrangular, and the cross stem portion 195h including the horizontal stem portion and the vertical stem portion, the outer stem portion 196h surrounding the outer portion, and the cross stem portion And a protrusion 192h protruding downward from the lower end of the vertical stem portion 195h.

The overall shape of the second subpixel electrode 191l is also a quadrangular shape, and includes a cross stem portion 195l including a horizontal stem portion and a vertical stem portion, an upper horizontal portion 196la and a lower horizontal portion 196lb, and a cross. And a protrusion 192l protruding upward from the top of the longitudinal stem portion of the stem portion 195l.

The shielding electrode 194 is formed between the first subpixel electrode 191h and the second subpixel electrode 191l. The shielding electrode 194 extends and includes left and right vertical portions 193la and 193lb positioned to the left and right of the first subpixel electrode 191h. Since the shielding electrode 194 receives a common voltage from the common voltage line 125 through the contact hole 184, the left and right vertical portions 193la and 193lb of the shielding electrode 194 may have the data line 171 and the first subpixel. Capacitive coupling, ie, capacitive coupling, between the electrodes 191h may be prevented.

Each of the first subpixel electrode 191h and the second subpixel electrode 191l is divided into four subregions by cross stems 195h and 195l. The first and second subpixel electrodes 191h and 191l include a plurality of fine branch portions 199h and 199l extending obliquely outward from the cross stem portions 195h and 195l in each subregion and neighboring fine branches. Fine slits 91h and 91l are located between the portions 199h and 199l.

The protrusion 192h of the first subpixel electrode 191h receives a data voltage from the first drain electrode 175h through the contact hole 185h, and the protrusion 192l of the second subpixel electrode 191l contacts. The data voltage is applied from the second drain electrode 175l through the hole 185l. In this case, the data voltage applied by the second subpixel electrode 191l may be smaller than the data voltage applied by the first subpixel electrode 191h.

An alignment layer (not shown) may be formed on the first and second subpixel electrodes 191h and 191l and the upper passivation layer 180q.

In the exemplary embodiment of the present invention, the first and second subpixel electrodes 191h and 191l include four subregions having different length directions of the fine branch portions 199h and 199l or the fine slits 91h and 91l. The inclination directions of the liquid crystal molecules of the layer 3 also become four directions in total. As described above, when the liquid crystal molecules are inclined in various directions, the reference viewing angle of the liquid crystal display is increased.

The first and second subpixel electrodes 191h and 191l applied with the data voltage generate an electric field together with the common electrode 270 of the upper panel 200 to form the liquid crystal layer 3 between the two electrodes 191 and 270. Determines the direction of the liquid crystal molecules. The degree of change in polarization of light incident on the liquid crystal layer 3 varies depending on the degree of tilt of the liquid crystal molecules, and the change in polarization is represented by a change in transmittance by the polarizer, through which the liquid crystal display displays an image.

The first subpixel electrode 191h and the common electrode 270 form the first liquid crystal capacitor Clch together with the liquid crystal layer 3 therebetween, and the second subpixel electrode 191l and the common electrode 270 The second liquid crystal capacitor Clcl is formed together with the liquid crystal layer 3 therebetween to maintain the applied voltage even after the first and second thin film transistors Qh and Ql are turned off.

After the first and second thin film transistors Qh and Ql are turned off, the third thin film transistor Qc is turned on so that the second liquid crystal capacitor Clcl is connected to the voltage converting capacitor Cstd so that the second liquid crystal capacitor ( Clcl) voltage drops. When the voltages of the first and second liquid crystal capacitors Clch and Clcl are different, the luminance is also different, and when the voltages of the first and second liquid crystal capacitors Clch and Clcl are properly adjusted, side visibility can be improved.

Next, a method of manufacturing the lower panel 100 of the liquid crystal display illustrated in FIGS. 3 to 5 will be described.

First, a gate conductive layer (not shown) is laminated on an insulating substrate 110 made of transparent glass, and a photosensitive film is coated thereon. A photoresist is irradiated with light through a photomask (not shown) using an exposure machine, and then developed to form a photoresist pattern (not shown), and the gate conductive layer is etched to remove the plurality of first gate lines 121 and the plurality of A plurality of gate conductors including the two gate lines 123, the repair member 2000, and the common voltage line 125 are formed.

Subsequently, a gate insulating layer 140 made of an inorganic insulator or an organic insulator is stacked on the gate conductor.

Subsequently, a semiconductor layer (not shown) and a semiconductor layer doped with impurities (not shown) are sequentially stacked on the gate insulating layer 140 by chemical vapor deposition or the like, and a data conductive layer (not shown) may be used as a sputtering method. After stacking the photosensitive film is applied thereon. Next, the photosensitive film is irradiated with light through a photomask (not shown) by using an exposure machine, and then developed to form a photosensitive film pattern (not shown) including portions having different thicknesses. Next, the data conductor layer, the semiconductor layer doped with impurities, and the semiconductor layer are etched by using the photoresist pattern as a mask, and the data conductor layer (not shown) having the same planar shape, the ohmic contact layer (not shown), and the plurality of linear semiconductors. 151 is formed.

After removing a portion of the photoresist pattern, the exposed data conductor layer and the ohmic contact layer are etched to form channel regions of the first, second, and third thin film transistors Qh, Ql, and Qc, and a plurality of data lines 171. ), A plurality of first drain electrodes 175h, a plurality of second drain electrodes 175l, a plurality of data conductors including a plurality of third source electrodes 173c and a plurality of third drain electrodes 175c, and a plurality of Ohmic contacts 161 and 165h are formed.

Subsequently, the lower passivation layer 180p is formed on the data conductor, and then the color filter 230 is formed, and the light blocking member 220 is formed on a region where the color filter 230 is not located and a part of the color filter 230. . The upper passivation layer 180q is formed on the color filter 230 and the light blocking member 220.

A plurality of contact holes 185h, 185l, and 184 are formed in the lower passivation layer 180p and the upper passivation layer 180q, and an IZO or ITO layer is deposited and patterned on the lower passivation layer 180p and the upper passivation layer 180q by a sputtering method. The pixel electrode 191 including the first subpixel electrode 191h and the second subpixel electrode 191l is formed.

As described above, the first, second, and third gate electrodes 124h, 124l, and 124c forming the first, second, and third thin film transistors Qh, Ql, and Qc are manufactured in the manufacturing process of the liquid crystal display. Of the second and third semiconductors 154h, 154l, and 154c, the first, second and third source electrodes 173h, 173l, and 173c, and the first, second, and third drain electrodes 175h, 175l, and 175c. Formation includes exposing the exposure machine. The first, second, and third thin film transistors Qh, Ql, and Qc may be caused by various causes, such as when the light emitted from the exposure machine is out of focus, an alignment error occurs, or a foreign material is involved in the manufacturing process. Defects may occur in the channel region such as the first, second, and third thin film transistors Qh, Ql, and Qc, which may always turn on regardless of their gate signals. In particular, when a failure occurs in the first and second thin film transistors Qh and Ql connected to the first and second subpixel electrodes 191h and 191l and applying a data voltage, the first and second subpixel electrodes 191h and 191l. ) May apply a data voltage to another pixel PX, and thus an image of the pixel PX may not be properly displayed. Therefore, the defective pixel PX is repaired to always display black. In particular, when a defect occurs in the second thin film transistor Ql, the second drain electrode 175l of the second thin film transistor Ql is disconnected, and the wide end portion 177c of the third drain electrode 175c and the common voltage line ( Although the third thin film transistor Qc is not connected to the common voltage even if the extension portions 126 of the 125 are shorted to each other, it is difficult to completely display the pixel area corresponding to the second enrichment electrode 191l in black.

Therefore, a method of repairing a defective part of the pixels of the liquid crystal display shown in FIGS. 1 to 3 and 5 and a pixel of the repaired liquid crystal display will be described with reference to FIG. 4.

As shown in FIG. 4, when a failure occurs in the second thin film transistor Ql, the second drain electrode 175l of the second thin film transistor Ql is disconnected using a laser beam or the like ( Part A). Then, the second thin film transistor Ql is separated from the data line 171 so that the data voltage is not applied.

Then, the wide end portion 177c of the third drain electrode 175c constituting the two terminals of the transformer capacitor Cstd and the extension portion 126 of the common voltage line 125 are shorted to each other (B1 portion), and the third drain. The electrode 175c and the repair member 2000 are shorted to each other (part B2), and the protrusion 192l of the second subpixel electrode 191l and the other end of the repair member 2000 are shorted to each other (part B3). Therefore, the function of the transformer capacitor Cstd is lost, and the third drain electrode 175c of the third thin film transistor Qc is directly connected to the common voltage Vcom, and the common voltage Vcom is the second subpixel electrode ( 191l). Accordingly, the voltage applied to the second liquid crystal capacitor Clcl becomes substantially zero, and the display area corresponding to the second subpixel electrode 191l displays black.

As described above, when a defect occurs in a pixel of the liquid crystal display such as a defect in the second thin film transistor Ql, the common voltage is directly applied to the second subpixel electrode 191l by using the repair member 2000. The pixel can be turned off to black to prevent display defects from occurring.

In the present embodiment, the repair member 2000 is formed on the same layer as the gate line 121, but the repair member is formed on the same layer as the data line 171, and the common voltage line 125 and the pixel electrode 191h, 191l).

Next, a repairing method of a liquid crystal display and a pixel of the repaired liquid crystal display according to another exemplary embodiment of the present invention will be described with reference to FIG. 6. The same reference numerals are given to the same components as in the above-described embodiment, and the same description is omitted.

6 is a layout view of a liquid crystal display according to another exemplary embodiment of the present invention.

As illustrated in FIG. 6, the repair portion 75 of the third drain electrode 175c extends toward the repair member 2000 in the middle of the third drain electrode 175c. Therefore, by forming the repair portion 75 of the third drain electrode 175c, the first drain electrode 175c and one end of the repair member 2000 may be completely shorted by using a laser. This is to prevent the short circuit from being incomplete when the short circuit with the repair member 2000 due to the narrow width of the middle portion of the third drain electrode 175c.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

3: liquid crystal layer 100: lower display panel
110 and 210: substrate 121: first gate line
123: second gate line 124l, 124h, 124c: gate electrode
125: common voltage line
140: gate insulating film 151, 154, 154h, 154l, 154c: semiconductor
171: data line
173h, 173l, 173c: source electrode
175h, 175l, and 175c: drain electrode
180p, 180q: protective shield
185h, 185l: contact hole
191h: first subpixel electrode 191l: second subpixel electrode
200: upper display panel 220: light blocking member
230: color filter 270: common electrode

Claims (18)

A gate line for transmitting a gate signal,
A common voltage line carrying a common voltage,
A data line crossing the gate line and transferring a data signal;
A switching element connected to the gate line and the data line,
A pixel electrode connected to the switching element, and
A repair member disposed between the common voltage line and the pixel electrode;
One end of the repair member overlaps a part of the gate line or a part of the data line. In claim 1,
And another portion of the gate line or another portion of the data line overlaps with a portion of the common voltage line. In claim 1,
Another portion of the gate line or another portion of the data line overlap with a portion of the pixel electrode. In claim 1,
One end of the repair member overlaps a portion of the gate line or a portion of the data line by a diameter of 4 to 6 μm. In claim 1,
The gate line includes a first gate line and a second gate line parallel to each other,
The pixel electrode
A first subpixel electrode and a second subpixel electrode,
The switching device includes a first switching device including a first drain electrode connected to the first subpixel electrode, and a first source electrode facing the first drain electrode;
A second switching element including a second drain electrode connected to the second subpixel electrode, and a second source electrode facing the second drain electrode;
A third switching element including a third source electrode connected to the second drain electrode, and a third drain electrode facing the third source electrode,
A transformer capacitor including the third drain electrode and the common voltage line as two terminals;
The repair member is formed between the first gate line and the second gate line, and one end of the repair member overlaps the third drain electrode. In claim 5,
The other end of the repair member overlaps a part of the second subpixel electrode. In claim 5,
And the third drain electrode has a repair portion extending in a horizontal direction, and the repair portion overlaps one end of the repair member. In claim 7,
And the first gate line is connected to the first switching element and the second switching element, and the second gate line is connected to the third switching element. 9. The method of claim 8,
The gate-off voltage Voff is applied to the second gate line when the gate-on voltage Von is applied to the first gate line, and the gate-on voltage Von is applied to the second gate line. A liquid crystal display device in which a gate-off voltage Voff is applied to one gate line. In claim 9,
And a voltage of the first subpixel electrode and the second subpixel electrode is different when the gate-on voltage Von is applied to the second gate line. A first gate line and a second gate line parallel to each other,
A repair member formed between the first gate line and the second gate line;
A data line intersecting the first gate line and the second gate line, and
Pixels arranged in a matrix
Including,
The pixel is
A first subpixel electrode and a second subpixel electrode,
A first switching element including a first drain electrode connected to the first subpixel electrode, and a first source electrode facing the first drain electrode;
A second switching element including a second drain electrode connected to the second subpixel electrode, and a second source electrode facing the second drain electrode;
A third switching element including a third source electrode connected to the second drain electrode, and a third drain electrode facing the third source electrode; and
A voltage storage capacitor comprising two terminals, a common voltage line transferring a third voltage and the third drain electrode.
Including,
One end of the repair member overlaps the third drain electrode,
The second drain electrode is disconnected, two terminals of the transformer capacitor are shorted to each other, one end of the repair member is shorted to the third drain electrode, and the other end of the repair member is the second subpixel. A liquid crystal display device shorted to the electrode. In claim 11,
The other end of the repair member overlaps a part of the second subpixel electrode. In claim 11,
And the third drain electrode has a repair portion extending in a horizontal direction, and the repair portion overlaps one end of the repair member. In claim 11,
The liquid crystal display in which the common voltage is transmitted to the second subpixel electrode. The first gate line and the second gate line parallel to each other, the repair member formed between the first gate line and the second gate line, the data line crossing the first gate line and the second gate line, and in the form of a matrix A pixel arranged, wherein the pixel includes a first subpixel electrode and a second subpixel electrode, a first drain electrode connected to the first subpixel electrode, and a first source facing the first drain electrode A second switching element comprising a first switching element including an electrode, a second drain electrode connected to the second subpixel electrode, and a second source electrode facing the second drain electrode, and the second drain electrode A third switching element including a third source electrode connected to the third source electrode, and a third drain electrode facing the third source electrode, and transferring a common voltage with the third drain electrode. A repairing method of a liquid crystal display device comprising a transformer capacitor including a common voltage line as two terminals, wherein one end of the repair member overlaps with the third drain electrode.
Disconnecting the second drain electrode;
Shorting the two terminals of the transformer capacitor with each other,
Shorting one end of the repair member with the third drain electrode;
Shorting the other end of the repair member with the second subpixel electrode;
Repair method of a liquid crystal display comprising a. The method of claim 15,
The other end of the repair member overlaps a portion of the second subpixel electrode. The method of claim 15,
The third drain electrode has a repair portion extending in the horizontal direction, wherein the repair portion overlaps one end of the repair member. The method of claim 15,
The repair method of the liquid crystal display device, wherein the common voltage is transmitted to the second subpixel electrode.

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