KR101662049B1 - In-Plane switching mode LCD - Google Patents

Abstract

The present invention provides a liquid crystal display device comprising: a gate line and a data line formed on a first substrate and defining a pixel region crossing each other with a gate insulating film interposed therebetween; A common wiring formed in parallel with the gate wiring, and an outermost common electrode branched from the common wiring and spaced apart from the data wiring in an outermost position in the pixel region; A thin film transistor formed in the pixel region and connected to the gate line and the data line; A protective layer formed on the thin film transistor and the data line, the drain contact hole exposing the drain electrode of the thin film transistor and the common contact hole exposing the common line; A plurality of pixel electrodes disposed on top of the protective layer and spaced apart from each other in contact with the drain electrode of the thin film transistor through the drain contact hole; A plurality of central common electrodes which are in contact with the common wiring via the common contact hole and spaced apart from the outermost common electrode and are alternately formed with the plurality of pixel electrodes; Wherein the data line is formed on the entire surface of the first substrate over the plurality of pixel electrodes and the central common electrode, and in the first region composed of the spacing between the data line and the outermost common electrode and the first portion of the outermost common electrode, A first alignment layer oriented in a first direction parallel to a longitudinal direction of the first alignment layer and oriented in a second direction different from the first direction corresponding to a second region except for the first region; A second substrate facing the first substrate; A black matrix formed on an inner surface of the second substrate corresponding to a boundary of the pixel region; A color filter layer formed under the black matrix; A second alignment layer covering the color filter layer and oriented to have the same alignment direction as the first alignment layer facing the first alignment layer; And a liquid crystal layer interposed between the first and second alignment films, wherein the black matrix is formed to cover the boundary between the first region and the second region.

Lateral electric field type liquid crystal display, VAC, aperture ratio, luminance, IPS

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an array substrate for a liquid crystal display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a transverse electric field type liquid crystal display device improved in aperture ratio and VAC (view angle crosstalk).

Generally, the driving principle of a liquid crystal display device utilizes the optical anisotropy and polarization properties of a liquid crystal. Since the liquid crystal has a long structure, it has a directionality in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Therefore, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular alignment direction of the liquid crystal by optical anisotropy, so that image information can be expressed.

At present, an active matrix liquid crystal display (AM-LCD) having a thin film transistor and a pixel electrode connected to the thin film transistor arranged in a matrix manner has excellent resolution and moving picture performance It is attracting attention.

The liquid crystal display device includes a color filter substrate on which a common electrode is formed, an array substrate on which pixel electrodes are formed, and a liquid crystal interposed between the two substrates. In such a liquid crystal display device, The liquid crystal is driven to have excellent properties such as transmittance and aperture ratio.

However, liquid crystal driving by an electric field that is applied up and down has a drawback that the viewing angle characteristic is not excellent.

Therefore, a transverse electric field type liquid crystal display device having excellent viewing angle characteristics has been proposed to overcome the above disadvantages.

Hereinafter, a general transverse electric field type liquid crystal display device will be described in detail with reference to FIG.

1 is a cross-sectional view of a general transverse electric field type liquid crystal display device.

As shown in the figure, the upper substrate 9, which is a color filter substrate, and the lower substrate 10, which is an array substrate, are spaced apart from each other and face each other. A liquid crystal layer 11 is interposed between the upper and lower substrates 9, .

The common electrode 17 and the pixel electrode 30 are formed on the same plane on the lower substrate 10 and the liquid crystal layer 11 is formed by the common electrode 17 and the pixel electrode 30 And is operated by the horizontal electric field (L).

2A and 2B are cross-sectional views respectively showing the on and off states of a general transverse electric field type liquid crystal display device.

2A showing the alignment state of the liquid crystal in the ON state to which the voltage is applied, the phase of the liquid crystal 11a at the position corresponding to the common electrode 17 and the pixel electrode 30 is The liquid crystal 11b located between the common electrode 17 and the pixel electrode 30 is formed by a horizontal electric field L formed by applying a voltage between the common electrode 17 and the pixel electrode 30, And arranged in the same direction as the horizontal electric field (L). That is, since the liquid crystal is moved by the horizontal electric field in the transverse electric field type liquid crystal display device, the viewing angle becomes wide.

Therefore, when viewed from the front, the transverse electric-field-type liquid-crystal display device can be visually observed in the direction of about 80 to 85 ^{° in the up} / down / left / right direction without reversal.

Next, referring to FIG. 2B, a horizontal electric field is not formed between the common electrode and the pixel electrode since the liquid crystal display device is in an off state in which no voltage is applied, so that the alignment state of the liquid crystal layer 11 is not changed.

3 is a cross-sectional view of a conventional transverse electric field type liquid crystal display device in which the center of one pixel region is cut along the direction in which data lines extend.

First, the array substrate 40 is formed with an outermost common electrode 49 on its inner side so as to be spaced apart from each other. Although not shown in the figure, the gate wiring (not shown) extending in one direction and the outermost common electrode 49a, and a common wiring (not shown) is further formed. A gate insulating film 50 is formed on the entire surface of the outermost common electrode 49a, the gate wiring (not shown) and the common wiring (not shown).

Next, a data line 60 crossing the gate line (not shown) and defining the pixel region P is formed on the gate insulating layer 50. At this time, the data line 60 is defined in the pixel region P and is formed at the boundary of one pixel region P adjacent to the data line 60, And the outermost common electrode 49a of the pixel P is formed.

A protective layer 65 is formed on the entire surface of the data line 60. The protective layer 65 is formed on the pixel region P with a predetermined gap therebetween, The common electrode 49b and the pixel electrodes 70a and 70b are formed. The first alignment layer 75 is formed on the center portion common electrode 49b and the pixel electrodes 70a and 70b in a predetermined direction with respect to the entire surface of the array substrate 40. [

(Not shown) 60 corresponding to the gate and data lines (not shown) 60 forming the boundary between the pixel regions P opposed to the array substrate 40 having such a configuration A color filter layer 84 including color filter patterns of red, green and blue in the form of sequentially and repeatedly arranged with the black matrix 82 and the color filter layer 84 including the black matrix 82 and the color filter layer 84, A color filter substrate 80 including a second alignment film 86 oriented in the same direction as the alignment direction of the first alignment film 75 provided in the first substrate 40 and the second alignment film 75 is disposed between the two substrates 40 and 80 And a liquid crystal layer 92 is provided on the liquid crystal display device 35 to form a transverse electric field type liquid crystal display device 35.

On the other hand, in the conventional transverse electric field type liquid crystal display device 35 having the above-described configuration, the liquid crystal is driven by the transverse electric field generated between the neighboring pixel electrodes 70a and 70b and the common electrodes 49a and 49b , An undesired transverse electric field is generated between the data line 60 and the outermost common electrode 49a spaced apart from the data line 60 to drive the liquid crystal to cause light leakage and cause view angle crosstalk (VAC).

Therefore, the outermost common electrode 49a and the data line 60, which include the spacing between the outermost common electrode 49a and the data line 60, as shown for preventing the light leakage and the VAC, A black matrix 82 having a sufficiently large width is formed.

In this case, the black matrix 82 should be formed sufficiently wide in consideration of the adhesion margin between the color filter substrate 80 and the array substrate 40. At this time, in order to prevent the VAC from taking account of the cohesion margin and the viewing angle characteristics, it is necessary that the distance between the outermost common electrode 49a and the data line 60, including the width of the outermost common electrode 49a, It is necessary to cover the area of the black matrix 82 through the black matrix 82.

Therefore, the black matrix 82 is formed so as to completely cover the outermost electrode 49a and to form an outermost pixel electrode (not shown) partially overlapped with the outermost common electrode 49a in order to form a storage capacitor with the outermost common electrode 49a 70a.

However, as described above, the black matrix 82 having a large width to overlap the data line 60 and the outermost common electrode 49a and the outermost pixel electrode 70a disposed therearound is formed The aperture ratio is lowered and the luminance is finally reduced.

When the luminance is lowered, measures such as increasing the number of lamps in the backlight unit are required to compensate for luminance, leading to an increase in manufacturing cost, which ultimately weakens the price competitiveness of the product.

In order to solve such a problem of the conventional transverse electric field liquid crystal display device, the present invention provides a transverse electric field liquid crystal display device capable of reducing a view angle crosstalk (VAC) caused by a data line and an outermost common electrode disposed in the vicinity thereof, And an object thereof is to provide a device.

Further, it is another object of the present invention to improve the price competitiveness by increasing the relative brightness by reducing the number of lamps by increasing the aperture ratio.

According to an aspect of the present invention, there is provided a transverse electric field type liquid crystal display comprising: a gate line and a data line formed on a first substrate, the gate line and the data line intersecting each other with a gate insulating film interposed therebetween; A common wiring formed in parallel with the gate wiring, and an outermost common electrode branched from the common wiring and spaced apart from the data wiring in an outermost position in the pixel region; A thin film transistor formed in the pixel region and connected to the gate line and the data line; A protective layer formed on the thin film transistor and the data line, the drain contact hole exposing the drain electrode of the thin film transistor and the common contact hole exposing the common line; A plurality of pixel electrodes disposed on top of the protective layer and spaced apart from each other in contact with the drain electrode of the thin film transistor through the drain contact hole; A plurality of central common electrodes which are in contact with the common wiring via the common contact hole and spaced apart from the outermost common electrode and are alternately formed with the plurality of pixel electrodes; Wherein the data line is formed on the entire surface of the first substrate over the plurality of pixel electrodes and the central common electrode, and in the first region composed of the spacing between the data line and the outermost common electrode and the first portion of the outermost common electrode, A first alignment layer oriented in a first direction parallel to a longitudinal direction of the first alignment layer and oriented in a second direction different from the first direction corresponding to a second region except for the first region; A second substrate facing the first substrate; A black matrix formed on an inner surface of the second substrate corresponding to a boundary of the pixel region; A color filter layer formed under the black matrix; A second alignment layer covering the color filter layer and oriented to have the same alignment direction as the first alignment layer facing the first alignment layer; And a liquid crystal layer interposed between the first and second alignment films, wherein the black matrix is formed to cover the boundary between the first and second regions.

At this time, even if an electric field is generated between the data line and the outermost common electrode due to the influence of the first and second alignment layers oriented in the first direction, the liquid crystal molecules in the liquid crystal layer are not driven So that the black state is always displayed.

The black matrix may be formed to cover both the data line and the spacing region between the outermost common electrode located on both sides of the data line or the black matrix formed so as to cover the boundary between the first region and the second region, The black matrices formed on both sides of the data line with respect to the data lines may be spaced apart from each other by a distance corresponding to a coalescence margin of the color filter substrate and the array substrate The width is always 6 占 퐉 to 10 占 퐉 so that the boundary between the first region and the second region is always obscured in consideration of 3 占 퐉 to 5 占 퐉.

The outermost and central common electrodes and the pixel electrodes are symmetrically bent with respect to the center of each pixel region. At this time, the data line also has a bent structure with respect to the center of each pixel region, and has a zigzag shape with respect to the entire surface of the array substrate.

The outermost pixel electrode formed at the outermost portion of each pixel region among the plurality of pixel electrodes is formed so as to overlap with the outermost common electrode.

The first and second dummy patterns may be formed as a semiconductor material under the data line.

The array substrate for a transverse electric field type liquid crystal display according to the present invention is characterized in that the orientation direction is different in a region where the pixel region, the data line and the outermost common electrode are formed, and a portion where the data line and the outermost common electrode are formed Even if an electric field is generated by the data line and the outermost common electrode, the liquid crystal does not move, thereby minimizing the width in the pixel region covered by the black matrix, thereby improving the aperture ratio.

In addition, since the liquid crystal is not driven by the electric field generated between the data line and the outermost common electrode, the black state is always displayed, thereby having an effect of preventing view angle crosstalk (VAC) from origin.

Furthermore, since the aperture ratio is improved, the luminance is increased, and the number of lamps required for expressing the same luminance is reduced, thereby reducing manufacturing cost.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 4 is a cross-sectional view of one pixel region including a switching element of a transverse electric field type liquid crystal display device according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating a data line of a transverse electric field type liquid crystal display device according to an embodiment of the present invention And a part of the periphery thereof.

 As shown in the figure, the transverse electric field type liquid crystal display device according to the embodiment of the present invention comprises a lower array substrate, an upper color filter substrate, and a liquid crystal layer interposed between these two substrates.

First, in the structure of the array substrate 110, a gate electrode 115 is formed in a switching region TrA where switching elements in each pixel region P on the inner side facing the color filter substrate are formed. Although not shown in the drawing, a gate wiring (not shown) is formed in the same layer as the gate electrode 115, and is connected to the gate electrode 115. (Not shown) are formed on the common electrode (not shown) so as to be spaced apart from the gate wiring (not shown) Is formed.

Next, a gate insulating film 121 is formed on the entire surface of the gate electrode 115, the gate wiring (not shown), the common wiring (not shown), and the outermost common electrode 118a. A semiconductor layer 130 made of an amorphous silicon active layer 125 and an ohmic contact layer 128 made of impurity amorphous silicon and being spaced apart from each other is formed in the switching region TrA, And a source electrode 140 and a drain electrode 143 are formed. The source and drain electrodes 140 and 143 spaced apart from the gate electrode 115, the gate insulating layer 121, and the semiconductor layer 130, which are sequentially stacked in the switching region TrA, Tr).

A data line 135 crossing the gate line (not shown) and defining the pixel region P is formed on the gate insulating layer 121 and connected to the source electrode 140. A first dummy pattern 126 made of the same material as the active layer 125 and a second dummy pattern 126 made of the same material forming the ohmic contact layer 128 are formed under the data line 135, Patterns 129 are formed, but these first and second dummy patterns 125 and 128 may be omitted.

Next, a drain contact hole 153 for exposing the drain electrode 143 of the thin film transistor Tr is formed on the thin film transistor Tr and the data line 135, a common contact hole 153 for exposing the common wiring (not shown) A protective layer 150 having a hole (not shown) is formed.

A first connection pattern (not shown) connected to the common wiring (not shown) through the common contact hole (not shown) as a transparent conductive material over the protection layer 150, And a plurality of central common electrodes 167 are formed spaced apart from one another in each pixel region P in parallel with the data lines 135. [ A second connection pattern 161 is formed on the passivation layer 150 and contacts the drain electrode 143 through the drain contact hole 153. The second connection pattern 161 is branched from the second connection pattern 161, The plurality of common electrodes 118 and 167 and the plurality of pixel electrodes 163a and 163b may be formed by alternately forming a plurality of pixel electrodes 163a and 163b spaced apart from and spaced apart from the plurality of common electrodes 167, And is arranged in parallel with the data line 135.

At this time, in the drawing, the outermost common electrode 118 and the pixel electrode (hereinafter referred to as the outermost pixel electrode 163a) located at the outermost one of the plurality of pixel electrodes 163a and 163b formed in the pixel region P Are formed by overlapping the outermost common electrode 118 and a part of the outermost common electrode 118. However, when the storage capacitor is formed of another constituent element, for example, the common wiring (not shown) When the storage capacitor is formed by overlapping the second connection pattern (not shown), the outermost pixel electrode 163a does not necessarily overlap the outermost common electrode 118.

The plurality of pixel electrodes 163a and 163b and the common electrodes 118 and 167 may have a straight bar shape in each pixel region P or may prevent a color inversion phenomenon at a specific viewing angle. In order to realize multiple domains in one pixel region P, it may be formed symmetrically with respect to the center of each pixel region P. In this case, the data line 135 also has a bent structure at the center of each pixel region P, and the data line 135 has a zigzag shape through the entire surface of the array substrate 110.

Next, a first alignment layer 175 is formed on the entire surface of the plurality of pixel electrodes 163a and 163b and the central common electrode 167. As a most characteristic part of the present invention, the first alignment layer 175 is formed in the pixel region P, more precisely, in the pixel region between the data line 135 and the spacing region between the outermost common electrode 118 and the data line 135, (Hereinafter referred to as a first region A1) except for a part of the outermost common electrode 118 is set to be 0 for the longitudinal direction of the pixel electrodes 163a and 163b and the common electrodes 118 and 167 A predetermined angle, for example, in a first direction having an angle of about 5 to 20 degrees, and the data line 135, the spacing region between the data line 135 and the outermost common electrode 118, Is oriented in a second direction parallel to the extending direction of the data line 135 corresponding to a region including a part of the outermost common electrode 118 (hereinafter referred to as a second region A2).

On the other hand, the first alignment film 175 is aligned so as to have a first direction corresponding to the first region A1 as described above, and a specific portion, that is, the second region, The alignment treatment for orienting in two directions is characterized by comprising a UV alignment device capable of alignment control in units of several micrometers. At this time, the first alignment layer 175 has a plurality of functional groups on its surface and is made of a polymer material in which the functional groups are aligned in a specific direction in response to UV light.

The boundary of the pixel region P of the array substrate 110 is formed on the inner surface of the color filter substrate 180 opposite to the array substrate 110, That is, a black matrix 182 is formed in correspondence with the gate wiring (not shown) and the data wiring 135. The black matrix 182 overlaps with the black matrix 182 and corresponds to the pixel region P, A color filter layer 184 is formed in such a manner that the color filter pattern is repeated in sequence.

The second alignment layer 186 is formed so as to cover the color filter layer 184 and the second alignment layer 186 has the same alignment structure as the first alignment layer 175 facing the second alignment layer 186 . In other words, a portion corresponding to the first region A1 is aligned in a first direction not parallel to the plurality of common electrodes 118 and 167 and the pixel electrodes 163a and 163b, Corresponding to the second area (A2) corresponding to a part of the outermost common electrode (118) and the spacing between the data line (135) and the outermost common electrode (118) adjacent to the data line (135) And is oriented in the second direction in parallel with the wiring 135. Liquid crystal molecules in the liquid crystal layer 192 corresponding to the pixel region P are formed by the common electrodes 118 and 167 and the pixel electrodes (not shown) by the configuration in which the first and second alignment films 175 and 186 have different alignment directions. 163a, and 163b, the gray level from white to black is displayed by rotating in one direction in accordance with the change in the intensity of the electric field. However, the liquid crystal layer 192 corresponding to the second region A2 Is in a state in which the longitudinal direction of the liquid crystal molecules in the liquid crystal molecules in the longitudinal direction is aligned with the data line 135 due to the alignment direction and therefore even if a transverse electric field is generated by the outermost common electrode 118 and the data line 135 The liquid crystal molecules do not rotate. Therefore, the second region A2 always exhibits a black state, and light leakage does not occur through the region where the outermost common electrode 118 and the data line 135 are spaced apart, and VAC corresponding to the viewing angle is also generated Do not.

Thus, as described above, the spacing between the data line 135 and the outermost common electrode 118 is always in a black state, and the data line 135 and the outermost common electrode 118 are themselves opaque It is made of a low resistance metal material, so that light is not transmitted. Therefore, it is possible to form the black matrix 182, which is formed to overlap with these components on these components, so as to have a smaller width than the conventional one.

In the case of the conventional transverse electric field type liquid crystal display, the black matrix is formed inside the pixel region more than the both ends including both ends of the data line and the outermost common electrode, or alternatively, When the outermost common electrode and the outermost pixel electrode overlap to form a storage capacitor, they are formed so as to completely overlap with the outermost pixel electrode.

However, in the case of the transverse electric field type liquid crystal display device 101 according to the present invention, even when the black matrix 182 is formed to have a relatively thin width as compared with the conventional transverse electric field type liquid crystal display device, So that the width is relatively small compared to the conventional one. That is, in the case of the transverse electric field type liquid crystal display device 101 according to the present invention, the black matrix 182 has a first region A1 and a second region A1, which are aligned so as to have a boundary portion having a different alignment direction, Is formed in consideration of the adhesion margin of the array substrate 110 and the color filter substrate 180 in correspondence with the boundary of the second area A2 that has been subjected to the alignment treatment so as to have the alignment direction.

The adhesion margin between the color filter substrate 180 and the array substrate 110 is typically about 3 to 5 占 퐉 and the boundary between the first region A1 and the second region A2 is the same as the outermost common electrode And is formed between the central portion of the width of the outermost common electrode 118 and one side facing the data line 135 corresponding to the data line 118. Accordingly, the black matrix 182 may reflect the first area A1 and the second area A1, which are aligned in the first direction, reflecting the error range of 3 mu m to 5 mu m when the array substrate 110 and the color filter substrate 180 are attached together And is formed such that its end is exposed to the outside of the boundary of the second region (A2) oriented in the second direction by about 3 to 5 mu m.

The common electrodes 118 and 167 and the pixel electrodes 163a and 163b are typically formed with a width of about 6 to 10 mu m. Therefore, the boundary between the first region A1 and the second region A2 is the same as the boundary between the uppermost common electrode 118 and the uppermost common electrode 118, The edge of the black matrix 182 is always formed on the outermost common electrode 118 even when the coalescence margin is taken into consideration, As shown in FIG. Therefore, the width of the black matrix 118 is reduced compared with the conventional one. In the conventional case, to prevent VAC, at least a portion away from the distance between the data line and the outermost common electrode by 11.5 mu m had to be covered with a black matrix.

However, in the case of the present invention, since the VAC can be originally prevented because the spacing between the data line 135 and the outermost common electrode 118 always represents a black state, the end of the black matrix 182 is connected to the data line 135 and the outermost common electrode 118, it is not necessary to have a width of 11.5 mu m or more from the boundary between the first region A1 and the second region A2, To 5 占 퐉 apart from each other. Accordingly, the width of the black matrix 182 having a width of about 2.5 μm to about 6.5 μm can be reduced with respect to the edge of the data line 135, as compared with the conventional method.

In the transverse electric field type liquid crystal display device according to the embodiment of the present invention, the black matrix 182 is formed so as to correspond to the data line 135, but as a variation thereof, So that the black matrix 182 may be removed from the part of the space between the outermost common electrode and the data line.

6 is a cross-sectional view of a transverse electric field type liquid crystal display device according to a modification of the embodiment of the present invention. Only the black matrix having the difference from the embodiment will be described since it has the same configuration as the embodiment except for the form of the black matrix. At this time, the same reference numerals are given to the same constituent elements as in the embodiment.

As shown in the drawing, in the transverse electric field type liquid crystal display device 101 according to the modification of the embodiment of the present invention, the black matrixes 182a and 182b formed corresponding to the pixel regions P are connected to the data lines 135 The outermost common electrode (not shown) including the outermost common electrode 118 and the data line 135 but not the portion between the outermost common electrode 118 and the data line 135, 118 are formed.

In the transverse electric field type liquid crystal display device 101 according to the embodiment and the modification of the present invention, since the spacing region between the data line 135 and the outermost common electrode 118 always displays a black state, (6 占 퐉 to 10 占 퐉) which can be reliably blocked only in consideration of the cohesion margin only at the boundary between the first area A1 and the second area A2, Black matrices 182a and 182b are formed.

The respective widths of the black matrices 182a and 182b formed in such a manner as to correspond to the boundaries of the first area A1 and the second area A2 become 6 占 퐉 to 10 占 퐉 in consideration of the cohesion margin, The boundary between the first region A1 and the second region A2 is formed at the center of the width of the outermost common electrode 118 because the width of the outer common electrode 118 is about 6 mu m to 10 mu m, The black matrices 182a and 182b are formed so as to completely overlap with the outermost common electrode 118 spaced from both sides of the data line 135 as shown in the figure, do. The other constituent elements and their structures are the same as those of the embodiment, and a description thereof will be omitted.

The transverse electric field type liquid crystal display device according to the above-described embodiments and modified examples is a conventional transverse electric field type liquid crystal display device having a black matrix having a width of 11.5 占 퐉 or more from a region where the data line and the outermost common electrode are spaced apart from each other, It was found that the aperture ratio of about 3% to 10% of the liquid crystal display device was improved.

1 is a cross-sectional view schematically showing a part of a general transverse electric field type liquid crystal display device.

FIGS. 2A and 2B are cross-sectional views respectively showing the on and off states of a general transverse electric field liquid crystal display device;

3 is a cross-sectional view showing a part of a conventional conventional transverse electric field type liquid crystal display device.

4 is a sectional view of one pixel region including a switching element of a transverse electric field type liquid crystal display according to an embodiment of the present invention.

5 is a plan view of a portion of the periphery thereof including the data lines of the transverse electric field type liquid crystal display device according to the embodiment of the present invention.

6 is a cross-sectional view of one pixel region including a switching element of a transverse electric field type liquid crystal display according to a modification of the embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

101: transverse electric field type liquid crystal display device 110: array substrate

115: gate electrode 118: outermost common electrode

121: gate insulating film 125: active layer

126: first dummy pattern 128: ohmic contact layer

129: second dummy pattern 130: semiconductor layer

135: data line 140: source electrode

143: drain electrode 150: protective layer

153: drain contact hole 163a: outermost pixel electrode

163b: central pixel electrode 167: central common electrode

175: first alignment layer 175a: first alignment layer oriented in the first direction

175b: a first alignment film oriented in the second direction

180: Color filter substrate 182: Black matrix

184: Color filter layer 186: Second alignment film

186a: a second alignment film oriented in a first direction

186b: a second alignment film oriented in the second direction

A1: first region A2: second region

P: pixel region TrA: switching region

Claims (9)

A gate line and a data line formed on the first substrate to define pixel regions intersecting each other with a gate insulating film interposed therebetween; A common wiring formed in parallel with the gate wiring, and an outermost common electrode branched from the common wiring and spaced apart from the outermost portion of the pixel region in parallel with the data wiring; A thin film transistor formed in the pixel region and connected to the gate line and the data line; A protective layer formed on the thin film transistor and the data line, the drain contact hole exposing the drain electrode of the thin film transistor and the common contact hole exposing the common line; A plurality of pixel electrodes disposed on top of the protective layer and spaced apart from each other in contact with the drain electrode of the thin film transistor through the drain contact hole; A plurality of central common electrodes which are in contact with the common wiring via the common contact hole and spaced apart from the outermost common electrode and are alternately formed with the plurality of pixel electrodes; And a second region formed on the entire surface of the first substrate over the plurality of pixel electrodes and the central common electrode, the second region comprising a region between the data line and the outermost common electrode and a first portion of the outermost common electrode, A first alignment layer oriented in a second direction parallel to the longitudinal direction of the first alignment layer and oriented in a first direction different from the second direction corresponding to the first region except for the second region; A second substrate facing the first substrate; A black matrix formed on an inner surface of the second substrate corresponding to a boundary of the pixel region; A color filter layer formed under the black matrix; A second alignment layer covering the color filter layer and oriented to have the same alignment direction as the first alignment layer facing the first alignment layer; A liquid crystal layer interposed between the first and second alignment layers, And the black matrix is formed to cover the boundary between the first region and the second region. The method according to claim 1, Even if an electric field is generated between the data line and the outermost common electrode due to the influence of the first and second alignment layers aligned in the second direction, the liquid crystal molecules in the liquid crystal layer are not driven, The liquid crystal display device displays a black state. The method according to claim 1, And the black matrix is formed to cover both the data line and the spacing region between the outermost common electrode located on both sides of the data line. The method according to claim 1, And the black matrix formed so as to cover the boundary between the first region and the second region is formed to be two-dimensionally spaced apart from both sides of the data line with respect to the data line. 5. The method of claim 4, The black matrix formed at the two sides of the data line and spaced apart from both sides of the data line by a distance of 3 占 퐉 to 5 占 퐉, which is the cohesion margin of the second substrate and the first substrate, And the width thereof is 6 占 퐉 to 10 占 퐉 so that the boundary is obscured. The method according to claim 1, Wherein the outermost and central common electrodes and the pixel electrodes are symmetrically bent with respect to a central portion of each pixel region. The method according to claim 6, Wherein the data line also has a folded structure with respect to a central portion of each pixel region, and has a zigzag shape with respect to the entire surface of the first substrate. The method according to claim 1, And an outermost pixel electrode formed at an outermost portion of each pixel region among the plurality of pixel electrodes is formed to overlap with the outermost common electrode. The method according to claim 1, And the first and second dummy patterns are formed as a semiconductor material below the data line.

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