KR20050054279A - Liquid crystal display device - Google Patents

Abstract

The present invention is made to prevent the drive failure of the pixel generated when the switching element is defective, the first and second substrate; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed in an intersection area of the gate line and the data line; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; And a liquid crystal layer formed between the first and second substrates.

Description

Liquid crystal display device {LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal field type liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing defective driving of pixels due to defective switching devices.

Liquid crystal display devices are mainly used as flat panel display devices having high quality and low power. The liquid crystal display device is bonded so that the thin film transistor array substrate and the color filter substrate face each other at a uniform interval, and a liquid crystal layer is formed between the thin film transistor array substrate and the color filter substrate.

In the thin film transistor array substrate, pixels are arranged in a matrix form, and a switching element, a pixel electrode, and a capacitor are formed in a unit pixel, and the color filter substrate includes a common electrode and an actual color for applying an electric field to the liquid crystal layer together with the pixel electrode. An RGB color filter and a black matrix are implemented to implement the.

On the other hand, an alignment layer is formed on the opposite surface of the thin film transistor array substrate and the color filter substrate, and rubbing is performed so that the liquid crystal layer is arranged in a constant direction. In this case, the liquid crystal is rotated by dielectric anisotropy when an electric field is applied between the pixel electrode formed for each unit pixel of the thin film transistor array substrate and the common electrode formed on the front surface of the color filter substrate, thereby passing or blocking light per unit pixel. Characters or images are displayed. However, the above-described twisted nematic mode liquid crystal display device has a disadvantage in that the viewing angle is narrow.

Accordingly, in-plane switching mode LCDs, which solve the viewing angle problem by aligning liquid crystal molecules in a substantially horizontal direction with a substrate, have been actively studied in recent years, and FIG. 1 shows a general horizontal field-type liquid crystal display device. 1A is a plan view, and FIG. 1B is a sectional view taken along line II ′ of FIG. 1A.

As shown in the figure, in the horizontal field type liquid crystal display device, the gate line 1 and the data line 3 are vertically and horizontally arranged on the transparent first substrate 10 to define the pixel area. In an actual liquid crystal display device, n gate lines 1 and m data lines 3 intersect with n x m pixels, but only one pixel is shown in the figure for simplicity.

A switching element (for example, a thin film transistor) composed of a gate electrode 1a, a semiconductor layer 5, and source / drain electrodes 2a and 2b at an intersection point of the gate line 1 and the data line 3; Is disposed, and the gate electrode 1a and the source / drain electrodes 2a and 2b are connected to the gate line 1 and the data line 3, respectively. In addition, the gate insulating film 8 is laminated over the entire substrate.

In the pixel region, the common line 4 is arranged in parallel with the gate line 1, and at least one pair of electrodes for switching the liquid crystal molecules, that is, the common electrode 6 and the pixel electrode 7, includes the data line 3. It is arranged parallel to. The common electrode 6 is connected to the common line 4 arranged in parallel with the gate line 1, and the pixel electrode 7 is connected to the first storage electrode 7a which is connected to the drain electrode 2b. The first storage electrode 7a forms a storage capacitor Cst with a second gate electrode 6a connected to the common electrode 6 with a gate insulating film 8 interposed therebetween.

A protective film 11 is formed over the entire substrate including the source / drain electrodes 2a and 2b.

In addition, the second substrate 20 includes a black matrix 21 for preventing light leakage into the thin film transistor 9, the gate line 1, and the data line 3, and a color filter 23 for realizing color. The overcoat film 25 for planarizing the color filter 23 is apply | coated on it. On the opposing surfaces of the first substrate 10 and the second substrate 20, alignment films 12a and 12b for determining the initial alignment direction of the liquid crystal are coated, and the first substrate 10 and the second substrate are coated. A liquid crystal layer 13 for controlling light transmittance by the voltage applied to the common electrode 6 and the pixel electrode 7 is formed between the 20.

The conventional horizontal field type liquid crystal display device having the structure as described above has the advantage of improving the viewing angle because the common electrode 6 and the pixel electrode 7 are disposed on the same substrate to generate a horizontal electric field.

On the other hand, since one switching element is formed in each pixel, when a defect occurs in the switching element, a problem arises in that the pixel does not operate normally. This problem is not only a horizontal field type liquid crystal display device, but also occurs in a liquid crystal display device driven by a vertical electric field such as a TN method.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal display device capable of driving a pixel normally in case of a defective switching device by further providing a repair switching element in one pixel. There is.

Other objects and features of the present invention will be described in detail in the configuration and claims of the following invention.

The present invention for achieving the above object is the first and second substrate; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed in an intersection area of the gate line and the data line; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; And a liquid crystal layer formed between the first and second substrates.

The first and second switching devices may include a gate electrode formed on the first substrate; A semiconductor layer formed on the gate electrode; And a source / drain electrode formed on the semiconductor layer, wherein the drain electrode of the first switching device is connected to the drain electrode of the second switching device. The auxiliary line may further include an auxiliary line overlapping the source electrode and the data line of the second switching device, and the auxiliary line may be disposed in the shape of a “┒” on the outside of the pixel. The display device may further include a passivation layer interposed between the source electrode and the data line and the auxiliary line, wherein the pixel electrode is formed on the same plane as the auxiliary line, that is, on the passivation layer. In addition, a color filter and a black matrix are formed on the second substrate.

On the other hand, when the first switching device is not normally driven, the auxiliary line is electrically connected to the data line and the source electrode of the second switching device through a laser repair, thereby preventing a driving failure of the pixel.

In addition, the present invention is the first and second substrate; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; An auxiliary line drawn from the data line in a "┒" shape and connected to the drain electrode of the second switching element; And a liquid crystal layer formed between the first and second substrates.

In addition, the present invention is the first and second substrate; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; An auxiliary line drawn out in the shape of “┒” outside the pixel to contact one side of the pixel with the data line through the first contact hole and the other side of the auxiliary contact with the drain electrode of the second switching device; And a liquid crystal layer formed between the first and second substrates.

In addition, the present invention is the first and second substrate; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; A first auxiliary line drawn out from the data line in the form of "-" and perpendicular to the first auxiliary line, one side of which overlaps the first auxiliary line, and the other side of which is the source electrode of the second switching element; A second auxiliary line overlapping with the second auxiliary line; And a liquid crystal layer formed between the first and second substrates.

On the other hand, when the first switching device does not operate normally, one side and the other side of the second auxiliary line is electrically connected to the source electrode of the first auxiliary line and the second switching device through a laser repair (raser repair), Allow the pixel to drive normally.

In addition, the present invention is the first and second substrate; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; And a liquid crystal layer formed between the first and second substrates.

At this time, the pixel electrode and the common electrode formed on the first substrate and the second substrate to generate a vertical electric field in the pixel, or further formed on the first substrate to generate a horizontal electric field in the pixel and It may be configured to further include a common electrode.

As described above, the present invention provides two switching elements in one pixel, thereby preventing the pixel from driving normally when a switching element failure occurs. That is, since one switching element is conventionally formed in one pixel, the switching element is normally driven due to a defect of the switching element generated during the process (for example, short between source / drain electrodes). This becomes impossible. Therefore, since a signal is not properly applied to the pixel, defective pixels are generated on the screen. On the other hand, in the present invention, since two switching elements are configured in one pixel, even if a defect occurs in one of them, the driving of the pixel can be normally performed by the other.

Further, the present invention can be applied to all liquid crystal display devices for horizontal and vertical electric field driving of liquid crystal molecules.

Hereinafter, the liquid crystal display device according to the present invention will be described in more detail with reference to Examples.

FIG. 2 illustrates a liquid crystal display device according to a first embodiment of the present invention. In particular, FIG. 2 shows a liquid crystal display device by a horizontal electric field method, FIG. 2A is a plan view, and FIG. 2B is a II-II 'of FIG. It is a cross section.

As shown in the figure, the liquid crystal display device 100 includes a plurality of pixels defined by the gate line 101 and the data line 103 arranged vertically and horizontally, and the gate line 101 and the data line 103. The first and second switching elements 109 and 109 'are formed in the intersection region of the first and second switching elements. The two switching elements 109 and 109 'are formed on the gate electrodes 101a and 101a' connected to the gate line 101 and the gate electrodes 101a and 101a 'to apply a signal to the gate electrodes 101a and 101a'. The semiconductor layers 105 and 105 'are activated as they become active, and the source electrodes 102a and 102a' and the drain electrodes 102b and 102b 'formed on the semiconductor layers 105 and 105'.

In addition, one side of the drain electrodes 102b and 102b 'of the first and second switching elements 109 and 109' is connected to the first switching element 109, and the other side thereof is connected to the second switching element 109 '. It is connected. In addition, the source electrodes 102a and 102a 'are connected to the data line 103, and in particular, the source electrode 102a of the first switching element 109 is directly drawn from the data line 103. The source electrode 102b 'of the second switching element 109' is connected by an auxiliary line 108 disposed in the shape of a "┑" on the outside of the pixel. In this case, a part of the auxiliary line 115 overlaps the data line 103 and the source electrode 102a 'with the passivation layer 111 interposed therebetween, and the pixel is formed by the first switching element 109. Insulated when driven. That is, the actual pixel is driven by the first switching element 109, and the second switching element 109 ′ is operated only when the first switching element 109 ′ is not driven. In other words, when the first switching device 109 is defective, the data line 103 and the source electrode 102a 'are connected through the auxiliary line 115 to operate the second switching device 109'. The pixel is driven. In this case, the method of electrically connecting the data line 103 and the source electrode 102a 'of the second switching element 109' is performed through a laser process. That is, by irradiating a laser on one side of the auxiliary line 112 overlapping the data line 103 and the other side of the auxiliary line 112 overlapping the source electrode 102a ', the data lines 103 are contacted with each other. Is electrically connected to the source electrode 102a 'of the second switching element 109'.

On the other hand, a common line 104 is formed outside the pixel in parallel with the gate line 101, and at least one pair of electrodes for switching the liquid crystal molecules by generating a horizontal electric field, that is, the common electrode 106 and the pixel. The electrodes 107 are arranged in parallel with the data line 103. The common electrode 106 is vertically branched from the common line 104 and overlaps the drain electrode line 102 formed between the drain electrodes 102b and 102b 'with the gate insulating layer 108 interposed therebetween. It is connected to the first storage electrode 106a. The pixel electrode 107 is connected to the drain electrode line 102 through the contact hole 114, and the first storage electrode 106a and the second storage electrode 107a have a storage capacitor Cst. To form.

A passivation layer 111 is coated on the entire surface of the substrate including the first and second thin film transistors 109 and 109 ', and the pixel electrode 107 and the second storage electrode 107a are formed on the passivation layer 111. do. In this case, the pixel electrode 107 and the second storage electrode 107a may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). As described above, as the pixel electrode 107 is formed of transparent conductivity, the light transmitting area is increased to improve luminance.

In addition, the second substrate 120 has a black matrix 121 for preventing light leakage and a color filter 123 for implementing a color, and an overcoat layer for planarizing the color filter 123 thereon. 125 is applied. On the opposing surfaces of the first substrate 110 and the second substrate 120, alignment layers 112a and 112b for determining the initial alignment direction of the liquid crystal are coated.

In addition, a liquid crystal layer 113 is formed between the first substrate 110 and the second substrate 120 to control light transmittance by a voltage applied to the common electrode 106 and the pixel electrode 107. have.

In the liquid crystal display device 100 configured as described above, the second switching device 109 ′ for repair is additionally formed in preparation for the defect of the first switching device 109 for driving the actual pixel. That is, when a failure of the first switching device 109 occurs, the data line and the source electrode are electrically connected to each other through the auxiliary line by using a laser, so that when the first switching device fails, the second switching device may fail. By driving the element, the pixel can be driven.

The basic concept of the present invention is to prevent the driving failure of the pixel due to the failure of the switching device by arranging two switching devices in one pixel, and has a repair switching device in addition to the above structure (FIGS. 2A and 2B). It includes all the liquid crystal display device.

3 to 6 show another embodiment of the present invention, and show a structure in which a repair switching element can be connected to a data line.

3 and 4 illustrate a liquid crystal display device according to the second and third embodiments of the present invention, in which all components except the connection structure of the source electrode and the data line of the second switching device are the first embodiment (FIG. 2A). 2b), and only the difference from the previous embodiment will be described in the present embodiment.

As shown in the drawing, in the liquid crystal display device 200 according to the present exemplary embodiment, pixels are defined by gate lines 201 and data lines 203 arranged vertically and horizontally, and the gate lines 201 and data lines are defined. First and second switching elements 209 and 209 'are formed in the cross region of 203. As shown in FIG. The first and second switching elements 209 and 209 'may include gate electrodes 201a and 201a', semiconductor layers 205 and 205 'formed on the gate electrodes 201a and 201a', and sources formed on the semiconductor layers 205 and 205 '. Electrode 202a and 202a '/ drain electrodes 202b and 202b', and the drain electrodes 202b and 202b 'of the first and second switching elements 209 and 209' are connected through the drain electrode line 202. The source electrodes 202a and 202a 'are connected to each other and to the data line 203. In particular, the source electrode 202a ′ of the second switching element 209 ′ is electrically connected to the data line 203 through auxiliary lines 215 and 215 ′ arranged in the shape of a “┒” outside the pixel. .

At this time, the auxiliary line 215 is formed on the same plane as the extension lines of the data line 203 and the source electrode 202a ', as shown in FIG. 3, or as shown in FIG. 4. It is formed on a different plane from the line 203 and the source electrode 202a ', and is electrically connected to the first and second contact holes 215a' and 215b 'formed on one side and the other side of the auxiliary line 215'. May be connected.

That is, when the auxiliary line 215 is formed on the same plane as the data line 203 and the source electrode 202a ′ (FIG. 3), the auxiliary line 215 may be formed by the gate line 201 and the gate electrode ( When the auxiliary line 215 'is formed on a plane different from the data line 203 and the source electrode 202a', it is formed on a gate insulating film (not shown) formed on the entire surface of the substrate including 201a and 201a '. 4) The auxiliary line 215 'is formed on a protective film (not shown) formed on the front surface of the substrate including the data line 203 and the source electrodes 202a and 202a'. In this case, first and second contact holes 215a 'and 215b' exposing portions of the data line 203 and the small electrode 202a 'are formed in the passivation layer (not shown).

Since the liquid crystal display devices 200 and 200 ′ configured as described above are usually driven by two switching elements 209 and 209 ′, there is an advantage in that the moving image is more advantageous than the case of driving by one switching element (FIGS. 2A and 2B). . That is, the first storage electrode 106a and the second storage electrode 107a form a storage capacitor Cst with a gate insulating film (not shown) interposed therebetween, and the storage capacitor Cst is the gate line 201. After the gate voltage is charged while the gate signal is applied, the voltage of the pixel electrode 207 is maintained by maintaining the charged voltage during the period in which the data voltage is supplied to the pixel electrode 207 during the next gate line 201 driving. It serves to prevent fluctuations.

Therefore, since the voltage is charged by the first switching element and the second switching element 209 and 209 'while the gate signal is applied, the charging time is reduced by half and the driving speed of the gate line is also increased. As a result, a moving image that requires high-speed driving is more advantageous.

In addition, as shown in FIG. 4, the structure in which the data line 203 and the auxiliary line 215 ′ are disposed on different layers is advantageous in reducing short defects between the data line 203 and the auxiliary line. There is this.

On the other hand, when a failure occurs in any one of the first and second switching elements 209 and 209 ', the pixel is driven by the other switching element. Therefore, even in this case, the driving failure of the pixel does not occur.

5 is a view showing a fourth embodiment of the present invention, and a description of the same configuration as the previous embodiments will be omitted, and only the differences will be described.

As shown in the figure, in the liquid crystal display device 300 according to the present exemplary embodiment, pixels are defined by gate lines 301 and data lines 303 arranged vertically and horizontally. The source electrode 302a 'of the data line 303 and the second switching element 309' by the first auxiliary line 315a arranged in the form of the second auxiliary line 315b arranged in the shape of "┃". Are connected to each other. That is, in the first auxiliary line 315a, a first auxiliary line 315a vertically branched from the data line 303 is disposed on a gate insulating film (not shown), and the first auxiliary line 315a is disposed. And a second auxiliary line 315b overlapping one side thereof are disposed on the passivation layer (not shown). The other side of the second auxiliary line 315b overlaps the source electrode 302a 'of the second switching element 309', and when the actual pixel is driven, the data line 303 and the saw electrode ( Since 302a 'is electrically insulated, the second switching element 309' does not operate. However, when the driving of the pixel is impossible due to a failure of the first switching device 309, the data line 303 and the source electrode 302a 'are electrically connected to drive the pixel, which is a laser process. Is done through.

That is, as described in the first embodiment, by irradiating a laser on one side and the other side of the second auxiliary line 315b overlapping the first auxiliary line 315a and the source electrode 302a ', the second auxiliary line The first auxiliary line 315a and the source electrode 302a 'of the second switching element 309' may be electrically connected through 315b.

In the liquid crystal display device 300 having the structure as described above, since the auxiliary line 315b adjacent to the data line is disposed on a different layer from the data line 303, as in the previous embodiment (see FIG. 4). The short circuit between the data line 303 and the auxiliary line 315b can be prevented.

Embodiments described above are horizontal field type liquid crystal display devices in which a pixel electrode and a common electrode are formed on the same substrate so that liquid crystal molecules are driven by a horizontal electric field, but the present invention is formed on different substrates. The liquid crystal molecules may be applied to vertical field type liquid crystal display devices such as TN, vertical alignment (VA), and optically compensated bend (OCB), which are driven by a vertical electric field.

6A and 6B illustrate a vertical field type liquid crystal display device according to a fifth embodiment of the present invention. FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line III-III ′ of FIG. 6A.

As shown in the figure, in the liquid crystal display device 400 according to the present exemplary embodiment, pixels are defined by gate lines 401 and data lines 403 arranged vertically and horizontally, and the gate lines 401 and data lines ( First and second switching elements 409 and 409 'are formed in the cross region of 403, and a pixel electrode 407 is formed in the pixel region.

The first and second switching elements 409 and 409 'include gate electrodes 401a and 401a' formed on the first substrate 410, semiconductor layers 405 and 405 'formed on the gate electrodes 401a and 401a', and the Source electrodes 402a and 402a 'and drain electrodes 402b and 402b' formed on the semiconductor layers 405 and 405 ', respectively, and drain electrodes 402b and 402b' of the first and second switching elements 409 and 409 '. Is in electrical contact with the pixel electrode 407 through a first contact hole 414a.

In addition, a first storage line 406a is disposed parallel to the gate line 401 at the center of the pixel, and a second gate insulating layer 408 is interposed between the first storage line 406a and a second storage line 406a. The storage electrode 406b is disposed, and the second storage electrode 406a is electrically connected to the pixel electrode 407 through the first contact hole 414b to form a storage capacitor Cst.

In addition, an auxiliary line 415 having a “┒” shape is disposed outside the pixel, and one side of the auxiliary line 415 overlaps the data line 403, and the other side thereof has a second switching element 409. It overlaps with the source electrode 402b 'of').

Therefore, the second switching device 409 'does not operate when the actual pixel is driven. However, when a failure occurs in the first switching device 409, the second switching device 409 'is connected by connecting the overlapping regions of the data line 403, the source electrode 402b, and the auxiliary line 415, respectively. It is used as a driving element.

In addition, although the auxiliary line 415 is formed on the passivation layer 411 in the drawing, as in the previous embodiments, the auxiliary line 415 is formed on the gate insulating layer 408 and the data line ( Only a region adjacent to the 403 is formed on the passivation layer 411, and a region formed from the data line 403 may be formed on the gate insulating layer 408.

On the other hand, the second substrate 420 is formed with a black matrix 421 to prevent light leakage and a color filter 423 for realizing a color, and an overcoat film for planarizing the color filter 423 thereon. 425) is applied. A common electrode 406 for driving a liquid crystal is formed on the overcoat layer 425 along with the pixel electrode 407. The opposite surface of the first substrate 410 and the second substrate 420 is formed on the overcoat layer 425. Alignment films 412a and 412b are applied to determine the initial alignment direction of the liquid crystal.

In addition, a liquid crystal layer 413 is formed between the first substrate 410 and the second substrate 420 to control light transmittance by a voltage applied to the common electrode 406 and the pixel electrode 407. have.

The liquid crystal display device according to the present invention has been described above through various embodiments. The basic concept of the present invention is to configure two switching elements in one pixel, and when driving is impossible due to a failure of one of the switching elements, the pixel is driven by driving the pixel by the other. Particularly, the present invention can drive both the switching elements or drive only one of the two switching elements when the actual pixel is driven. When defects are generated when driven by one element, repair is performed through a laser process. By driving the switching element, defective pixels can be prevented. In addition, the switching element is a thin film transistor, and can be both "-" channel or "U" channel, in particular, the "U" channel can improve the switching speed by improving the width of the channel (width). have.

As described above, according to the present invention, by further comprising a repair switching element in one pixel, it is possible to prevent the defect of the pixel generated when the switching element is defective and to improve the image quality. In addition, the repair switching element can be formed at the same time as the switching element for driving the actual pixel, without further processing.

1A and 1B illustrate a general horizontal field type liquid crystal display device.

2A and 2B illustrate a horizontal field type liquid crystal display device according to a first embodiment of the present invention.

Figure 3 shows a second embodiment of the present invention.

4 is a view showing a third embodiment of the present invention.

5 shows a fourth embodiment of the present invention.

6A and 6B show a fifth embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

101,201,301,401: gate lines 103,203,303,403: data lines

115,215,215'425: Secondary line 315a, 315b: First, second auxiliary line

104,204,304: common line 106,206,306,406: common electrode

107,207,307: pixel electrode 108,208,308,408: gate insulating film

111,211,311,411: Protective film 113,413: Liquid crystal layer

106a, 206a, 306a: first storage electrode

107a, 207a, 307a: second storage electrode

109,209,309,409: first switching element

109 ', 209', 309 ', 409': second switching element

Claims (17)

First and second substrates; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed in an intersection area of the gate line and the data line; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; And And a liquid crystal layer formed between the first and second substrates. The method of claim 1, wherein the first and second switching elements, A gate electrode formed on the first substrate; A semiconductor layer formed on the gate electrode; And And a source / drain electrode formed on the semiconductor layer. The method of claim 1, And a drain electrode of the first switching element is connected to a drain electrode of the second switching element. The liquid crystal display device of claim 2, further comprising an auxiliary line overlapping the source electrode and the data line of the second switching device. 5. The liquid crystal display of claim 4, wherein the auxiliary line is disposed in an “┒” shape on an outer edge of the pixel. The liquid crystal display device of claim 4, further comprising a passivation layer interposed between the source electrode and the data line and the auxiliary line. The liquid crystal display device of claim 1, wherein the pixel electrode is formed on the same plane as the auxiliary line, that is, on the passivation layer. The liquid crystal display device of claim 1, wherein the second substrate comprises a color filter and a black matrix. 5. The method of claim 1, wherein the auxiliary line is electrically connected to a data line and a source electrode of the second switching device through a laser repair when the first switching device is not normally driven. Liquid crystal display device characterized in that. The liquid crystal display of claim 1, wherein the common electrode is formed on the same plane as the gate line. First and second substrates; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; An auxiliary line drawn from the data line in a "┒" shape and connected to the drain electrode of the second switching element; And And a liquid crystal layer formed between the first and second substrates. First and second substrates; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; An auxiliary line drawn out in the shape of “┒” outside the pixel to contact one side of the pixel with the data line through the first contact hole and the other side of the auxiliary contact with the drain electrode of the second switching device; And And a liquid crystal layer formed between the first and second substrates. First and second substrates; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; At least one pair of common electrode and pixel electrode for generating a horizontal electric field in the pixel; A first storage electrode connected to the common electrode and a second storage electrode connected to the pixel electrode; A first auxiliary line drawn out from the data line in the form of "-" and perpendicular to the first auxiliary line, one side of which overlaps the first auxiliary line, and the other side of which is the source electrode of the second switching element; A second auxiliary line overlapping with the second auxiliary line; And And a liquid crystal layer formed between the first and second substrates. The method of claim 13, wherein when the first switching device does not normally drive, one side and the other side of the second auxiliary line are electrically connected to the source electrode of the first auxiliary line and the second switching element through laser repair. Liquid crystal display device characterized in that connected to. First and second substrates; Gate lines and data lines arranged vertically and horizontally on the first substrate to define pixels; First and second switching elements formed at intersections of the gate line and the data line and including a gate electrode, a semiconductor layer formed on the gate electrode, and a source / drain electrode formed on the semiconductor layer, respectively; And And a liquid crystal layer formed between the first and second substrates. The liquid crystal display device of claim 15, further comprising a pixel electrode formed on the first substrate and a common electrode formed on the second substrate. The liquid crystal display device according to claim 15, further comprising a pixel electrode and a common electrode formed on the first substrate to generate a horizontal electric field in the pixel.