KR20040061594A - Liquid crystal display device of in-plane switching - Google Patents

Abstract

PURPOSE: An in-plane switching mode LCD(liquid crystal display) is provided to prevent light leakage in a blue line. CONSTITUTION: An in-plane switching mode LCD includes a liquid crystal panel, a plurality of gate lines and data lines(94a), pixel electrodes, common electrodes, and a dummy data line(94b). The liquid crystal panel includes an active region, a dummy region and a pad region. The gate lines and data lines are arranged in an intersecting manner to define pixel regions. The pixel electrodes and common electrodes are formed on the pixel regions. The dummy data line is arranged in the dummy region in parallel with the data lines and short-circuits with the (n-1)th data lines.

Description

Transverse electric field type liquid crystal display device {LIQUID CRYSTAL DISPLAY DEVICE OF IN-PLANE SWITCHING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and in particular, a liquid crystal display of an in-plane switching (hereinafter referred to as IPS) suitable for improving the last dot (blue) light leakage phenomenon occurring at low temperatures. Relates to a device.

As the information society develops, the demand for display devices is increasing in various forms.In recent years, liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and vacuum fluorescent display (VFD) have been developed. Various flat panel display devices have been studied, and some are already used as display devices in various devices.

Among them, LCD is the most widely used as a substitute for CRT (Cathode Ray Tube) for the use of mobile image display device because of the excellent image quality, light weight, thinness, and low power consumption, and mobile type such as monitor of notebook computer. In addition, it is being developed in various ways, such as a television for receiving and displaying broadcast signals, and a monitor of a computer.

As described above, although various technical advances have been made in order for the liquid crystal display device to serve as a screen display device in various fields, the task of improving the image quality as the screen display device has many advantages and disadvantages.

Therefore, in order to use a liquid crystal display device in various parts as a general screen display device, the key to development is how much high definition images such as high definition, high brightness, and large area can be realized while maintaining the characteristics of light weight, thinness, and low power consumption. It can be said.

Such a liquid crystal display device may be broadly divided into a liquid crystal panel displaying an image and a driving unit for applying a driving signal to the liquid crystal panel, wherein the liquid crystal panel includes first and second glass substrates having a space and are bonded to each other; It consists of a liquid crystal layer injected between the said 1st, 2nd glass substrate.

The first glass substrate (TFT array substrate) may include a plurality of gate lines arranged in one direction at a predetermined interval, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, and A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing each gate line and data line, and a plurality of thin films that transmit signals of the data line to each pixel electrode by being switched by signals of the gate line The transistor is formed.

The second glass substrate (color filter substrate) includes a black matrix layer for blocking light in portions other than the pixel region, an R, G, B color filter layer for expressing color colors, and a common electrode for implementing an image. Is formed. Of course, the common electrode is formed on the first glass substrate in the transverse electric field type liquid crystal display device.

The first and second glass substrates are bonded by a sealing material having a predetermined space by a spacer and having a liquid crystal injection hole, and a liquid crystal is injected between the two substrates.

In this case, in the liquid crystal injection method, the liquid crystal is injected between the two substrates by osmotic pressure when the liquid crystal injection hole is immersed in the liquid crystal container by maintaining the vacuum state between the two substrates bonded by the reality. When the liquid crystal is injected as described above, the liquid crystal injection hole is sealed with a sealing material.

On the other hand, the driving principle of the liquid crystal display device as described above uses the optical anisotropy and polarization of the liquid crystal.

Since the liquid crystal is thin and long in structure, the liquid crystal has a direction in the arrangement of molecules, and the liquid crystal may be artificially applied to control the direction of the molecular arrangement.

Accordingly, when the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light polarized by optical anisotropy may be arbitrarily modulated to express image information.

Such liquid crystals may be classified into positive liquid crystals having a positive dielectric anisotropy and negative liquid crystals having a negative dielectric anisotropy according to an electrical specific classification, and liquid crystal molecules having a positive dielectric anisotropy are long axes of liquid crystal molecules in a direction in which an electric field is applied. The liquid crystal molecules arranged in parallel and having negative dielectric anisotropy are arranged perpendicularly to the direction in which the electric field is applied and the major axis of the liquid crystal molecules.

1 is an exploded perspective view illustrating a part of a general TN liquid crystal display device.

As shown in FIG. 1, the lower substrate 1 and the upper substrate 2 bonded to each other with a predetermined space, and the liquid crystal layer 3 injected between the lower substrate 1 and the upper substrate 2 are composed of. It is.

More specifically, the lower substrate 1 has a plurality of gate lines 4 arranged in one direction at regular intervals to define the pixel region P, and in a direction perpendicular to the gate lines 4. A plurality of data lines 5 are arranged at regular intervals, and a pixel electrode 6 is formed in each pixel region P where the gate line 4 and the data line 5 intersect, and each gate line The thin film transistor T is formed at the portion where (4) and the data line 5 intersect.

The upper substrate 2 includes a black matrix layer 7 for blocking light in portions other than the pixel region P, an R, G, and B color filter layer 8 for expressing color colors, and an image. The common electrode 9 is formed to implement the.

The thin film transistor T may include a gate electrode protruding from the gate line 4, a gate insulating film (not shown) formed on the front surface, an active layer formed on the gate insulating film above the gate electrode, and the data. And a source electrode protruding from the line 5 and a drain electrode to face the source electrode.

The pixel electrode 6 uses a transparent conductive metal having a relatively high light transmittance, such as indium-tin-oxide (ITO).

In the liquid crystal display device configured as described above, the liquid crystal layer 3 positioned on the pixel electrode 6 is aligned by a signal applied from the thin film transistor T, and the liquid crystal layer 3 is aligned with the alignment degree of the liquid crystal layer 3. Accordingly, the image can be expressed by controlling the amount of light passing through the liquid crystal layer 3.

As described above, the liquid crystal panel drives the liquid crystal by an electric field applied up and down, and has excellent characteristics such as transmittance and aperture ratio, and the common electrode 9 of the upper substrate 2 serves as a ground to discharge static electricity. It is possible to prevent the destruction of the liquid crystal cell.

However, the liquid crystal drive by the electric field applied up-down has a disadvantage that the viewing angle characteristics are not excellent.

Accordingly, in order to overcome the above disadvantages, a new technology, namely, a liquid crystal display device of IPS, has been proposed.

2 is a schematic cross-sectional view showing a liquid crystal display of a general IPS.

As shown in FIG. 2, the pixel electrode 12 and the common electrode 13 are formed on the lower substrate 11 on the same plane.

In addition, the liquid crystal layer 14 formed between the lower substrate 11 and the upper substrate 15 bonded to the lower substrate 11 may be disposed between the pixel electrode 12 and the common electrode 13 on the lower substrate 11. It works by electric field.

3A to 3B are views illustrating an alignment direction of liquid crystals when voltage on / off is performed in IPS mode.

That is, FIG. 3A shows an off state in which the transverse electric field is not applied to the pixel electrode 12 or the common electrode 13, so that the change in the alignment direction of the liquid crystal layer 14 does not occur. For example, the pixel electrode 12 and the common electrode 13 are basically shifted by 45 ° in the horizontal direction.

FIG. 3B is an on state in which a lateral electric field is applied to the pixel electrode 12 and the common electrode 13, and the liquid crystal alignment of the liquid crystal layer 14 occurs, and is about 45 ° compared to the off state of FIG. 3A. It can be seen that the horizontal direction of the pixel electrode 12 and the common electrode 13 and the twist direction of the liquid crystal have a twist angle.

As described above, in the liquid crystal display of the IPS, both the pixel electrode 12 and the common electrode 13 exist on the same plane.

An advantage of the transverse electric field method is that a wide viewing angle is possible.

That is, when the liquid crystal display device is viewed from the front, the liquid crystal display device may be visible in the up / down / left / right directions at about 70 °.

In addition, there is an advantage that the manufacturing process is simpler and the color shift according to the viewing angle is smaller than that of the liquid crystal display device.

However, since the common electrode 13 and the pixel electrode 12 are present on the same substrate, there is a disadvantage in that transmittance and aperture ratio due to light are reduced.

In addition, there is a disadvantage in that the response time due to the driving voltage must be improved and the cell gap is made uniform because the misalign margin of the cell gap is small.

That is, the transverse electric field type liquid crystal display device has the advantages and disadvantages as described above can be selected according to the user's use.

Hereinafter, a liquid crystal display of a conventional IPS will be described with reference to the accompanying drawings.

4 is a plan view of a liquid crystal display device of a transverse electric field method (IPS) according to the prior art, Figure 5a is an enlarged plan view of a liquid crystal display device of the IPS according to the prior art in the area 'A' of Figure 4, Figure 5b Fig. 5A is a structural cross sectional view of a conventional IPS liquid crystal display device along the line II ′ of 5a.

4 and 5a and 5b, the liquid crystal display of the conventional IPS is provided with a plurality of gate lines 61 in one direction at regular intervals to define pixel regions on the transparent lower substrate 60. The data lines 64 are arranged at regular intervals in a direction perpendicular to the gate line 61.

In this case, the data line 64 has a zigzag shape in the length of one pixel area.

A thin film transistor T is formed in each pixel region defined by the gate line 61 and the data line 64 crossing each other.

The thin film transistor T is formed on the gate electrode 61a protruding from the gate line 61, the gate insulating layer 62 formed on the front surface, and the gate insulating layer 62 on the gate electrode 61a. The active layer 63, the source electrode 64a protruding from the data line 64, and the drain electrode formed at a predetermined interval from the source electrode 64a and integrally formed with the pixel electrode 66b. 66a).

In addition, the common wiring and the common electrodes 61b and 61c are formed on the same layer as the gate line 61. In this case, the common wiring 61b is formed to cross the pixel region in parallel with the gate line 61. A plurality of common electrodes 61c are formed in a zigzag pixel region in parallel with the zigzag data lines 64.

At this time, the common electrode 61c is arranged up and down symmetrically with respect to the common wiring 61b as shown in FIG. 5A.

A passivation layer 65 is formed on the entire lower substrate 60 including the data line 64.

In the pixel region defined by the intersection of the gate line 61 and the data line 64, the pixel electrode 66b is arranged in a zigzag form between the common electrodes 61c so as to be parallel to the common electrode 61c and have a predetermined interval. Is arranged.

In this case, the pixel electrodes 66b are also arranged up and down symmetrically with respect to the common wiring 61b.

The pixel electrode 66b is connected to the drain electrode of the thin film transistor through a contact hole.

In this case, the liquid crystal positioned between the common electrode 61c and the pixel electrode 66b is arranged in the same direction by a transverse electric field distributed between the common electrode 61c and the pixel electrode 66b to form one domain. In the transverse electric field system, a plurality of multi-domains can be configured in a single pixel area, thereby making it possible to manufacture a liquid crystal display having a wider viewing angle.

Since the common electrode 61c and the pixel electrode 66b are formed in a zigzag shape, all of the liquid crystals positioned in one pixel may be aligned in various directions without being aligned in one direction. It is possible to derive a multi-domain capable of varying the orientation direction of the liquid crystal.

Although not shown in the drawings, the common line 61b may not be formed to cross the pixel region, and may be disposed outside the pixel region adjacent to the gate line 61. The pixel electrode 66b is not formed symmetrically with respect to the common wiring 61b, but may be formed by bending several times in a zigzag shape in a pixel area parallel to each other.

On the other hand, in the conventional transverse electric field type liquid crystal display having the above configuration, as shown in FIGS. 4 and 5B, when ionic impurities flow into the active line and accumulate through the liquid crystal injection hole 56, metal and transparency Due to the difference in the work function between the dielectric material ITO, that is, the common wiring 61c and the pixel electrode 66b, DC is generated relatively large between +/- frames.

The level of DC action increases the ion trap probability and level due to the increase in the DC level relative to structures using the same metal or the same ITO.

In particular, since the last window of the last dot, that is, the blue dot, has a larger number of ions trapped in the actual opening area than the right window area in which the data line is located, the internal DC becomes larger.

The trapped ions cause the blue line light leakage phenomenon, which occurs more severely at low temperatures where the movement speed of the ions is slow (bad charge / discharge characteristics).

In more detail, as described above, the last dot region has an effective voltage Veff different from other regions of the entire liquid crystal panel. In addition, the difference occurs as much as the coupling (Coupling) acting between the data line and the pixel electrode, and the effective voltage (Veff) is different from the other pixel electrode in the liquid crystal panel, the luminance difference occurs.

In particular, in the case of a transverse electric field type liquid crystal display device, ions are charged differently between the electrodes (①, ②, ③, ④) in the pixel area, and thus the effective voltage Veff may be different for each window. .

Due to such a difference in the charge level, in the case of the last fourth window ('④'), the charging form is changed because there is no signal wire on the right side of the common electrode unlike other parts of the panel.

As a result, it is different from other areas of the liquid crystal panel, and even in the last dot area, the last window has another electrical characteristic.

In this region, since the liquid crystal injection holes are adjacent, a large amount of impurities exist, and as a result, the number of ions to be coupled is large, so that a lot of ions are trapped in the last 4th window (4), thereby generating DC.

For this reason, light is counted in the low luminance area due to the DC accumulated in the last 4 windows.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a transverse electric field type liquid crystal display device suitable for preventing the light leakage phenomenon in the blue line, the last dot.

1 is an exploded perspective view showing a part of a typical TN liquid crystal display device

Figure 2 is a schematic cross-sectional view showing a liquid crystal display device of a typical transverse electric field (IPS)

3A to 3B are views illustrating an alignment direction of liquid crystal when voltage on / off is performed in IPS mode.

4 is a plan view of a liquid crystal display device of a transverse electric field method (IPS) according to the prior art;

5A is an enlarged plan view of a liquid crystal display of an IPS according to the related art in the region 'A' of FIG. 4.

FIG. 5B is a structural cross-sectional view of a conventional IPS liquid crystal display device taken along line II ′ of FIG. 5A.

6 is a plan view of an LCD of an IPS according to an exemplary embodiment of the present invention.

FIG. 7A is an enlarged plan view of an LCD of an IPS according to an exemplary embodiment of the present invention in the region 'B' of FIG. 6.

FIG. 7B is a structural cross-sectional view of an IPS liquid crystal display according to an exemplary embodiment of the present invention taken along line II-II ′ of FIG. 7A.

8 is a structural cross-sectional view of a dummy data line and an n-1 th data line shorted;

Explanation of symbols for the main parts of the drawings

70: seal material 71: liquid crystal inlet

80: upper substrate 81: black matrix

82: color filter layer 83: overcoat layer

90: lower substrate 91: gate line

91a: gate electrode 91b: common wiring

91c: common electrode 91d: dummy common electrode

92 gate insulating film 93 active layer

94a: data line 94b: dummy data line

94c: source electrode 95: protective film

96: pixel electrode 96a: drain electrode

96b: storage electrode 96c: shorting bar

In accordance with one aspect of the present invention, there is provided a liquid crystal display device having a transverse electric field type; A plurality of (n) gate lines and data lines intersecting to define a pixel area; A pixel electrode and a common electrode formed on the pixel area; And a dummy data line arranged in the dummy area in parallel with the data line and shorted with an n-1 th data line in the pad area.

A thin film transistor formed at an intersection of the gate line and the data line in the active region; A common wiring formed on the same layer as the gate line and arranged in parallel with the gate line; A plurality of common electrodes connected to the common wiring and formed at predetermined intervals in the pixel area; And a pixel electrode connected to the thin film transistor and having a predetermined distance between the plurality of common electrodes and formed in the same direction as the data line.

The pad region may include a gate insulating layer formed on the lower substrate, and a plurality of (n) data lines, the dummy data lines, the data lines, and the dummy data lines formed at predetermined intervals on the gate insulating layer. A short circuit formed on the passivation layer formed on the passivation layer, the contact hole formed on the n-1th data line and the dummy data line, and the contact hole and the passivation layer between the n-1th data line and the dummy data line. Includes a bar.

The dummy region includes a dummy thin film transistor, a dummy common wiring, a dummy common electrode, and a dummy pixel electrode configured in the same way as the active region.

The pixel electrode and the common electrode are formed in a zigzag shape.

The data line is formed in a zigzag shape.

The pixel electrode extends to an upper portion of a front gate line.

Hereinafter, a transverse electric field type liquid crystal display device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

6 is a plan view of a liquid crystal display of the IPS according to an embodiment of the present invention, FIG. 7A is an enlarged plan view of a liquid crystal display of the IPS according to an embodiment of the present invention in the region 'B' of FIG. 7A is a cross-sectional view of a liquid crystal display device of an IPS according to an embodiment of the present invention along the line II-II 'of FIG. 7A.

8 is a structural cross-sectional view of a dummy data line and an n−1 th data line shorted.

The present invention configures a dummy data line in a dummy area on the right side of the last dot area, and applies a dummy data line and an n-1th data line in a pad area to apply signals having opposite polarities to the last data line and the dummy data line. It is characterized by shorting the configuration.

The dummy region is provided with the same components as the pixel region of the active region.

Hereinafter, the liquid crystal display of the transverse electric field method according to an embodiment of the present invention has a predetermined interval to define a pixel region on the transparent lower substrate 90 as shown in FIGS. 6 and 7A and 7B. A plurality of gate lines 91 are arranged in one direction, and a plurality (n) of data lines 94a are arranged at regular intervals in a direction perpendicular to the gate line 91.

In this case, the data line 94a has a zigzag shape that is bent at least once in the longitudinal direction of one pixel area. Although Fig. 8A shows an example of bending once, it may be broken several times more. In addition, the data line 94a may not have a zigzag shape.

In addition to the last data line 94a adjacent to the liquid crystal injection hole 71 as shown in FIG. 6, a dummy data line 94b is further disposed in the last window portion of the last dot (blue dot). .

That is, the dummy data line 94b is disposed in the dummy area outside the active line adjacent to the liquid crystal injection hole 71.

In this case, the dummy data line 94b may also have a zigzag shape or may not have a zigzag shape like the data line 94a formed on the active line.

The gate line 91 and the data line 94a intersect to define a pixel region, and a thin film transistor T is formed in each cross region.

The thin film transistor T may be formed on the gate electrode 91a protruding from the gate line 91, the gate insulating layer 92 formed on the front surface, and the gate insulating layer 92 on the gate electrode 91a. The active layer 93 formed thereon, the source electrode 94c protruding from the data line 94a, and the pixel electrode 96 formed at regular intervals from the source electrode 94c are formed integrally therewith. It consists of the drain electrode 96a formed in the figure.

In addition, common wiring and common electrodes 91b and 91c are formed on the same layer as the gate line 91, where the common wiring 91b is formed to cross the pixel region in parallel with the gate line 91. A plurality of electrodes 91c are formed in a zigzag pixel region in parallel with the data line 94a.

At this time, the common electrodes 91c are arranged up and down symmetrically with respect to the common wiring 91b and are connected to each other.

The common wiring 91b may be formed to overlap the gate line 91 to form a storage capacity.

The passivation layer 95 is formed on the entire lower substrate 90 including the data line 94a.

The pixel region defined by the intersection of the gate line 91 and the data line 94a has a zigzag shape parallel to the common electrode 91c, and the pixel electrode 96 between the common electrodes 91c at regular intervals. ) Is arranged.

In addition, the pixel electrode 96 is connected to the drain electrode of the thin film transistor T through a contact hole.

The pixel electrode 96 extends to an upper end of the front gate line to form a storage electrode.

In this case, the storage structure may be configured as a hybrid storage structure (not shown) applying both a storage on gate and a storage on common.

On the other hand, in the transverse electric field type liquid crystal display having the above configuration, as shown in FIGS. 6 and 7B, the dummy data line 94b produces the following effects.

That is, ion impurities flow into the active region inside the active line through the liquid crystal injection hole 71 and accumulate. When a DC voltage is applied to the dummy data line 94b, the dummy data line 94b and the outermost common electrode ( A positive potential well is formed between 91c and the dummy common electrode 91d to accumulate '-' ion impurities.

When the '-' ion impurities are trapped in the potential well to some extent, a repulsion force is generated between the '-' ions, thereby reducing the probability of introducing '-' ion impurities outside the active region into the active region.

In addition, during actual driving, '-' ions are attracted to the potential region formed in the dummy data line 94b, thereby reducing the number of ions trapped in the actually opened region, thereby improving the blue line light leakage.

In this case, the distance between the pixel electrode 96 and the common electrode 91c is about 10 μm or more, and the dummy data line 94b, the outermost common electrode 91c, the dummy data line 94b, and the dummy common electrode 91d. Since the distance is approximately 2 to 3 μm, the electric field is more strongly applied to the dummy data line 94b and the outermost common electrode 91c (or the dummy common electrode 91d), that is, the non-opening region, compared to the opening area. Larger numbers of '-' ions are trapped in the potential wells, resulting in better light leakage levels than in the prior art.

As described above, the dummy data line 94b may be formed in a region adjacent to the liquid crystal inlet 71 outside the active line, thereby preventing '-' ion impurities introduced through the liquid crystal inlet from moving into the active region.

In addition, when the data line of the last dot region is defined as the nth data line, as shown in FIGS. 6, 7A, and 8, the dummy data line 94a and the n-1th data line 94a (n-1). ) Is shorted in the pad area 'C', and signals of the same polarity are simultaneously applied.

In more detail, the gate insulating film 92 is formed on the lower substrate 90 of the pad region, and the n-th data line 94a (n) has a predetermined interval on the gate insulating film 92. -1)) and a dummy data line 94b, and a passivation layer 95 is formed on the n-th data line 94a (n-1) and the dummy data line 94b. and contact holes are formed on the n-1 th data line 94a (n-1) and the dummy data line 94b, respectively, and the n-1 th data line 94a (n-1) through the contact hole. ) And a shorting bar 96c are formed on the passivation layer 95 so that the dummy data line 94b is shorted.

In this case, the shorting bar 96c is formed of the same transparent conductive film as the material of the pixel electrode 96 or is formed of a metal film.

As described above, when the n-th data line 94a (n-1) and the dummy data line 94b are shorted, the dummy data line 94b has a signal having a polarity opposite to that of the n-th data line 94a (n). Since is applied, the entire liquid crystal panel has the same polarity distribution (when driving in dot inversion: +-+-+-+)

In addition, when the dummy data line 94b is disposed on the right side of the last dot region and a signal having the opposite polarity is applied, the peripheral region has the same coupling effect and the same ion charging characteristic, so that residual DC is generated in the last dot region. Can be prevented.

If the dummy data line 94b is shorted with the nth data line 94a (n), since the polarity is the same as the nth data line 94a (n), only the last line is conspicuous when the LCD panel is viewed as a whole. It is perceived differently.

As described above, as shown in FIGS. 7A and 7B, the dummy data line is arranged in the dummy region by the same arrangement as the active region, that is, the dummy thin film transistor, the dummy first and second common electrodes, and the dummy pixel electrode. Due to the strong electric field between 94b and the dummy common electrode 91d, the movement of ions also encounters a large barrier, making it difficult to move into the active region.

As a result, a signal having a polarity opposite to the n th data line 94a (n) is applied to the dummy data line 94b without additional circuitry, and thus uniform coupling characteristics and ion shielding are applied to the entire liquid crystal panel. By simultaneously acting as a window, it is possible to prevent a lot of ions trapped in a specific region to act as a residual DC.

In addition, although not shown in the drawing, the common line 91b may not be formed to cross the pixel region, and may be disposed outside the pixel region adjacent to the gate line 91.

In this case, the common electrode 91c and the pixel electrode 96 are not formed symmetrically with respect to the common wiring 91b, but are bent at least once in a zigzag shape in the pixel areas parallel to each other.

The gate line 91 and the common wiring, the common electrodes 91b and 91c are formed of a metal of aluminum (Al), chromium (Cr), molybdenum (Mo), or tungsten (W), and the gate insulating layer 92 Is formed of a silicon nitride film (SiNx) or a silicon oxide film (SiO ₂ ).

The protective layer 95 is formed to protect the active layer 93 from external moisture or foreign matter, and is formed of any one of acryl, polyimide, Benzo cyclobutene (BCB), oxide film, and nitride film.

Although not shown in the drawing, an alignment layer made of polyimide or photo-alignment material is further formed on the entire surface of the lower substrate 90 including the pixel electrode 96 and the common wiring and common electrodes 91b and 91c. .

Here, the alignment layer made of polyimide is determined by mechanical rubbing, and the photoreactive material made of polyvinylcinnamate based material or polysiloxane based material is oriented by irradiation with light such as ultraviolet rays. This is determined.

At this time, the orientation direction is determined by the irradiation direction of the light or the property of the irradiated light, that is, the polarization direction.

The upper substrate 80 includes a black matrix 81, a color filter layer 82, and an overcoat layer 83. The lower substrate 90 and the upper substrate 80 are bonded together as shown in FIG. 6. Seal material 70 is formed on the lower substrate 90 or the upper substrate 80.

The overcoat layer 83 may not be formed.

The liquid crystal located between the common electrode 91c and the pixel electrode 96 is arranged in the same direction by a transverse electric field distributed between the common electrode 91c and the pixel electrode 96 to form one domain. With the same configuration, in the transverse electric field system, a plurality of multi-domains can be configured in a single pixel area, thereby making it possible to manufacture a liquid crystal display device having a wider viewing angle.

That is, since the common electrode 91c and the pixel electrode 96 are formed in a zigzag form, all of the liquid crystals positioned in one pixel may be aligned in various directions instead of corresponding one directions. It is possible to derive a multi-domain capable of varying the orientation direction of the liquid crystal oriented in the pixel.

On the other hand, the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in Esau.

The transverse electric field type liquid crystal display device of the present invention as described above has the following effects.

When the dummy data line is provided and the n-1 th data line and the dummy data line are shorted to apply a signal of opposite polarity to the n th data line and the dummy data line, light leakage from the blue line, which is the last dot, is generated. It can be improved effectively.

Accordingly, the quality of the liquid crystal display device of the IPS can be improved.

Claims (7)

A liquid crystal panel in which an active region, a dummy region and a pad region are defined; A plurality of (n) gate lines and data lines intersecting to define a pixel area; A pixel electrode and a common electrode formed on the pixel area; And a dummy data line arranged in the dummy area in parallel with the data line and shorted with an n-1th data line in the pad area. The method of claim 1, A thin film transistor formed at an intersection of the gate line and the data line in the active region; A common wiring formed on the same layer as the gate line and arranged in parallel with the gate line; A plurality of common electrodes connected to the common wiring and formed at predetermined intervals in the pixel area; And a pixel electrode connected to the thin film transistor and having a predetermined interval between the plurality of common electrodes and formed in the same direction as the data line. The method of claim 1, A gate insulating film formed on the lower substrate; A plurality of (n) data lines and the dummy data lines formed on the gate insulating layer at predetermined intervals; A passivation layer formed on the lower substrate including the data line and the dummy data line; Contact holes respectively formed on the n−1 th data line and the dummy data line; And a shorting bar formed on the passivation layer between the contact hole and the n-th data line and the dummy data line. The method according to claim 1 or 2, And a dummy thin film transistor, a dummy common wiring, a dummy common electrode, and a dummy pixel electrode in the dummy region, the dummy thin film transistor having the same configuration as the active region. The method of claim 2, And the pixel electrode and the common electrode are formed in a zigzag form. The method of claim 2, And the data lines are zigzag-shaped. The method of claim 2, And the pixel electrode extends to an upper portion of a front gate line.