KR101897744B1 - In-Plane Switching mode Liquid crystal display device - Google Patents

Abstract

The present invention provides a color filter substrate comprising: a color filter substrate having red, green, and blue color filter patterns; An array substrate facing the color filter substrate and defining red, green, and blue pixel regions facing the red, green, and blue color filter patterns, respectively; A gate wiring and a data wiring formed on an inner surface of the array substrate, the gate wiring and the data wiring crossing each other with a gate insulating film interposed therebetween; A common wiring formed on the same layer so as to be spaced apart from and spaced apart from the gate wiring; an outermost common electrode branched from the common wiring and formed at an outermost periphery of each pixel region; A thin film transistor formed near the intersection of the gate line and the data line; And a plurality of first central portions connected to the drain electrodes of the thin film transistors and having a first width in the red pixel region and a central portion thereof having a first angle with respect to a rubbing direction perpendicular to the gate wiring, A plurality of second central pixel electrodes having a second width in the green pixel region and a central portion thereof symmetrically bent at a second angle with respect to a rubbing direction perpendicular to the gate wiring; A plurality of second central pixel electrodes having a third width in a pixel region and a central portion thereof symmetrically bent at a third angle with respect to a rubbing direction perpendicular to the gate lines; A plurality of first central portion common electrodes connected to the outermost common electrode, the first central portion common electrodes having the first width in the red pixel region and alternating with and parallel to the plurality of first central pixel electrodes; A plurality of third central pixel electrodes having a first width, a second width, and a plurality of second central pixel electrodes alternately arranged in parallel with the plurality of second pixel electrodes; A plurality of third central common electrodes formed on the substrate; And a liquid crystal layer interposed between the color filter substrate and the array substrate, wherein the second width is smaller than the first width, and is larger than the third width.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display (LCD)

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device, and more particularly, to a transverse electric field type liquid crystal display device capable of increasing transmittance and improving image quality.

Recently, as the age of information society is rapidly progressing, a display field for processing and displaying a large amount of information has been developed.

In particular, in recent years, a flat panel display has been required to meet the era of thinning, light weight, and low power consumption, and accordingly, a thin film transistor liquid crystal display (LCD) display) was developed.

Such a display method of the liquid crystal display device utilizes the optical anisotropy and the polarization property of the liquid crystal molecules. That is, since the structure of the liquid crystal molecules is long and has a pre-tilt angle that is directional in the arrangement thereof, when a voltage is artificially applied to the liquid crystal, the line inclination angle of the liquid crystal molecules is changed, It is possible to arbitrarily adjust the alignment direction of the liquid crystal molecules to change the molecular arrangement of the liquid crystal by applying an appropriate voltage to the liquid crystal layer and arbitrarily modulate the polarized light due to the optical anisotropy of the liquid crystal Thereby expressing the desired image information.

At present, active matrix liquid crystal displays (LCDs) in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner are receiving the most attention because of their excellent resolution and video realization capability.

In a liquid crystal panel which is a basic element of a general liquid crystal display device, a color filter substrate on the upper side and an array substrate on the lower side are opposed to each other with a predetermined space therebetween. A liquid crystal including liquid crystal molecules is filled between these two substrates .

In this case, the electrode for applying a voltage to the liquid crystal becomes a common electrode located on the color filter substrate and a pixel electrode located on the array substrate. When a voltage is applied to the two electrodes, A vertical electric field is used to control the direction of the liquid crystal molecules located therebetween.

However, as described above, when the common electrode and the pixel electrode are formed vertically and the liquid crystal is driven by the vertical electric field generated by the vertical electric field generated there, there is an advantage that the characteristics such as the transmittance and the aperture ratio are excellent. However, In order to overcome such disadvantages, a liquid crystal driving method using an in-plane switching (IPS) method using a horizontal electric field has been proposed.

Hereinafter, the above-described transverse electric field type liquid crystal display will be described in detail with reference to Fig.

The color filter substrate 9 and the thin film transistor array substrate 10 are opposed to each other with a color filter substrate 9 having a color filter. The liquid crystal layer 11 is filled.

At this time, on the thin film transistor array substrate 10, the common electrode 17 and the pixel electrode 19 are horizontally formed with the same spacing on the same plane, and a horizontal electric field L And the liquid crystal molecules located between the horizontal electric fields L are driven by the influence of the liquid crystal molecules.

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

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 19 The liquid crystal 11b located between the common electrode 17 and the pixel electrode 19 is formed by a horizontal electric field L formed by applying a voltage between the common electrode 17 and the pixel electrode 19 , 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.

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

Since the liquid crystal is driven by the horizontal electric field as described above, when the user views the screen displayed through the transverse electric field liquid crystal display device, the horizontal electric field type liquid crystal display device is oriented to about 80 to 85 degrees And has a visible viewing angle characteristic.

Such an array substrate for a transverse electric field type liquid crystal display will be described with reference to Fig.

3 is a plan view showing a part of a pixel region of an array substrate of a conventional transverse electric field type liquid crystal display device.

As shown in the figure, the conventional array substrate 30 for a lateral electric field type liquid crystal display comprises a plurality of gate wirings 32 arranged in parallel in the horizontal direction spaced apart from each other by a predetermined distance, A common wiring 36 that is formed in parallel with the gate wiring 32 and a data wiring 40 that intersects the two wirings 32 and 36 and particularly defines the pixel region P with respect to the gate wiring 32 ).

A gate electrode 34, a gate insulating film (not shown), a semiconductor layer 39, and source and drain electrodes 42 and 44 are sequentially formed near the intersection of the gate wiring 32 and the data wiring 40 The thin film transistor Tr is formed. At this time, the source electrode 42 branches off from the data line 40, and the gate electrode 34 branches off from the gate line 32.

A plurality of pixel electrodes 52 branched from an auxiliary wiring line 50 connected to the drain electrode 44 are formed in the pixel region P and a plurality of pixel electrodes 52 arranged in a staggered manner parallel to the pixel electrode 52, A plurality of common electrodes 38 branched at the common wiring 36 are formed with the same spacing.

However, in the liquid crystal display device provided with the array substrate for a transverse electric field type liquid crystal display device having the above structure, since each pixel region forms a single domain, the azimuth angle of the liquid crystal display device viewed by the user changes, For example, color shift phenomenon occurs at 0 degree, 90 degree, 180 degree, and 270 degree, which causes the display quality to deteriorate.

Accordingly, in order to prevent such a color shift phenomenon, an array substrate for a transverse electric field type liquid crystal display in which a dual domain is realized in one pixel region has been proposed.

4 is a plan view of one pixel region of a conventional array substrate for a transverse electric field type liquid crystal display in which a double domain is implemented in one pixel region.

As shown in the figure, one pixel region P does not have a rectangular shape and its central portion is symmetrically bent. A plurality of pixel electrodes 82 and a common electrode 68, which are alternately arranged, It is also characterized by the fact that its central part is bent. Therefore, the arrangement direction between the two electrodes 82 and 68 on the upper and lower sides of the pixel electrode 82 and the common electrode 68 bent in the respective pixel regions P is changed A double domain is realized, and it becomes possible to suppress the color shift phenomenon at the above-described specific azimuth angle.

The transverse electric field type liquid crystal display device displays a color by using red, green, and blue sub-pixels each having a structure corresponding to the pixel region of FIG. 4 as a basic unit.

However, due to the difference in retardation between wavelengths, the maximum transmittance generation voltage is different for each sub-pixel of red, green and blue. That is, the transmittance of the blue sub-pixel B is the lowest and the transmittance of the red sub-pixel R is the highest at the same voltage.

Accordingly, in order to increase the white luminance, a method has been used in which the transmittance is increased by increasing the area of the blue sub-pixel and the transmittance increase portion of the blue sub-pixel is shifted to the green wavelength band to improve the total transmittance.

However, in this case, since the area of the red or green sub-pixel is reduced as the area of the blue sub-pixel increases, the total transmittance increase is not so great. In addition, there is a problem that the corresponding masks must be produced also in the color filter manufacturing process.

In order to solve the above problems, the present invention provides a transverse electric field type liquid crystal display device in which transmittance is increased by uniformizing the transmittance of each red, green and blue sub-pixel.

According to an aspect of the present invention, there is provided a color filter substrate comprising: a color filter substrate having red, green, and blue color filter patterns; An array substrate facing the color filter substrate and defining red, green, and blue pixel regions facing the red, green, and blue color filter patterns, respectively; A gate wiring and a data wiring formed on an inner surface of the array substrate, the gate wiring and the data wiring crossing each other with a gate insulating film interposed therebetween; A common wiring formed on the same layer so as to be spaced apart from and spaced apart from the gate wiring; an outermost common electrode branched from the common wiring and formed at an outermost periphery of each pixel region; A thin film transistor formed near the intersection of the gate line and the data line; And a plurality of first central portions connected to the drain electrodes of the thin film transistors and having a first width in the red pixel region and a central portion thereof having a first angle with respect to a rubbing direction perpendicular to the gate wiring, A plurality of second central pixel electrodes having a second width in the green pixel region and a central portion thereof symmetrically bent at a second angle with respect to a rubbing direction perpendicular to the gate wiring; A plurality of second central pixel electrodes having a third width in a pixel region and a central portion thereof symmetrically bent at a third angle with respect to a rubbing direction perpendicular to the gate lines; A plurality of first central portion common electrodes connected to the outermost common electrode, the first central portion common electrodes having the first width in the red pixel region and alternating with and parallel to the plurality of first central pixel electrodes; A plurality of third central pixel electrodes having a first width, a second width, and a plurality of second central pixel electrodes alternately arranged in parallel with the plurality of second pixel electrodes; A plurality of third central common electrodes formed on the substrate; And a liquid crystal layer interposed between the color filter substrate and the array substrate, wherein the second width is smaller than the first width, and is larger than the third width.

The second angle is greater than the first and third angles, and the first angle is greater than or equal to the third angle.

The widths of the red, green, and blue pixel regions all have the same size.

In each of the red, green and blue pixel regions, an outermost pixel electrode is formed so as to overlap the drain common electrode and overlaps with the outermost common electrode, thereby forming a first storage capacitor together with the outermost common electrode.

Wherein the outermost pixel electrode and the plurality of first to third middle pixel electrodes are connected to the drain electrode by an auxiliary pixel pattern connecting one end of the pixel electrode and the auxiliary pixel pattern is overlapped with the common wiring, And forms a second storage capacitor in addition to the common wiring.

One end of each of the first and second center portion common electrodes is provided with an auxiliary common pattern for connecting the ends thereof to the outermost common electrode.

Wherein the array substrate is provided with a protective layer covering the thin film transistor and having a drain contact hole exposing a drain electrode of the thin film transistor and a common contact hole exposing the outermost common electrode, The pixel pattern and the drain electrode are connected, and the auxiliary common pattern is connected to the outermost electrode through the common contact hole.

The plurality of first to third center pixel electrodes, the plurality of first to third center common electrodes, and the outermost pixel electrode are all formed of a transparent conductive material on the protective layer.

The data line is symmetrically bent at a central portion of each pixel region to form a zigzag shape with respect to the entire surface of the array substrate.

The transverse electric field type liquid crystal display device according to the present invention has the effect of preventing the color shift phenomenon and improving the viewing angle by implementing the double domain in one pixel region.

Further, by making the red, red, and blue pixel electrode widths different from each other and the spacing and arrangement angle, the same transmittance can be exhibited at the same drive voltage, thereby increasing the transmittance and preventing the drive voltage from rising. Therefore, deterioration in image quality can be improved.

On the other hand, since the red, green, and blue pixel areas have the same area, masks of the red, green, and blue color filters can be applied in the same manner, thereby reducing manufacturing cost.

1 is a cross-sectional view schematically showing a general IPS mode liquid crystal display device.
FIGS. 2A and 2B are cross-sectional views showing operations of the on and off states of a general transverse electric field type liquid crystal display device, respectively.
3 is a plan view showing a part of a pixel region of an array substrate of a conventional transverse electric field type liquid crystal display device.
4 is a plan view of one pixel region of a conventional array substrate for a transverse electric field type liquid crystal display in which a double domain is implemented in one pixel region.
5 is a plan view of three pixel regions corresponding to red, green and blue color filter patterns of a transverse electric field type liquid crystal display device according to an embodiment of the present invention.
6 is a view schematically showing only the outermost pixel electrode, the central common electrode, and the middle pixel electrode formed in the red and green pixel regions and the blue pixel region in the array substrate for a transverse electric field type liquid crystal display according to the present invention.
Figs. 7 and 8 are cross-sectional views, respectively, of a portion cut along line VII-VII and VIII-VIII of Fig. 5, respectively.

Hereinafter, preferred embodiments of the present invention will be described in detail.

5 is a plan view of three pixel regions corresponding to red, green and blue color filter patterns of a transverse electric field type liquid crystal display device according to an embodiment of the present invention. 5, the pixel regions corresponding to the red, green, and blue color filter patterns are referred to as red, green, and blue pixel regions, respectively. Here, the numbers of the central pixel electrode and the central common electrode provided in the blue and red pixel regions having the constituent differentiating points are different from each other.

5, in the transverse electric field type liquid crystal display 100 according to the embodiment of the present invention, the array substrate 101 includes a plurality of gate wirings 103 spaced apart from each other by a predetermined distance and arranged in parallel in the horizontal direction, A plurality of common wirings 109 arranged in parallel with the plurality of gate wirings 103 in proximity to the plurality of gate wirings 103 and a plurality of common wirings 109 crossing the plurality of gate wirings 103, And a plurality of data lines 135 extending in the vertical direction are defined.

A gate electrode 103 branched from the gate wiring 103 or made of the gate wiring 103 itself is formed in the pixel region P near the intersection of the gate wiring 103 and the data wiring 135 A semiconductor layer 120 composed of an active layer (not shown) and an ohmic contact layer (not shown) over the gate insulating film (not shown), a gate insulating film (not shown) A thin film transistor Tr having source and drain electrodes 138 and 141 which are in contact with the semiconductor layer 120 and are spaced apart from each other is formed. At this time, the source electrode 138 branches from the data line 135.

The outermost common electrode 110 branched from the common wiring 109 formed adjacent to and adjacent to the gate wiring 103 in the pixel region P is arranged in parallel with the data wiring 135 in parallel Respectively.

A common auxiliary pattern 172 is formed between the outermost common electrodes 110 and is spaced apart from the outermost common electrode 110 and connected to one end of the outermost common electrode 110 through a common contact hole 168, A plurality of central common electrodes 173, 273 and 373 are formed by branching from the common auxiliary pattern 172. [

 A pixel auxiliary pattern 169 is formed in each of the pixel regions P so as to overlap with the common wiring 109 and is connected to the drain electrode 141. The pixel auxiliary pattern 169 is branched The outermost pixel electrode 170 and the plurality of central pixel electrodes 171, 271 and 371 are formed alternately with the plurality of central common electrodes 173, 273 and 373. At this time, the common wiring 109 and the pixel auxiliary pattern 169 which are overlapped with each other constitute first and second storage electrodes, respectively, and a gate insulating film (not shown) and a protective layer (not shown) Storage capacitor (StgC).

The outermost pixel electrode 170 located at the outermost one of the pixel electrodes 170, 171, 271 and 371 is partially overlapped with the outermost common electrode 110 to form an auxiliary storage capacitor .

The outermost pixel electrode and the common electrodes 170 and 110 and the central pixel electrodes 171 and 271 and 371 and the common electrodes 173 and 273 and 373 are formed in the pixel region A plurality of pixel electrodes (not shown) formed in a red pixel region Pr and having a structure symmetrically bent with respect to the imaginary line when a virtual line is drawn in parallel with the gate line 103 at the center of the pixel region P, 170 and 371 and the common electrodes 110 and 373 and the bent angle of the plurality of pixel electrodes 170 and 171 and the common electrodes 110 and 173 formed in the green pixel region Pg, And a plurality of pixel electrodes 170 and 271 formed in the blue pixel region Pb and a plurality of common electrodes 110 and 273 are different in angle of deflection.

In other words, the angles of deflection of the common electrodes 110, 173, 273 and 373 and the pixel electrodes 170, 171, 271 and 371 in the red, green and blue pixel regions (Pr, Pg and Pb) θg and θb, the following equation is established. θg <θr ≤ θb

At this time, a reference line that is a reference of the angle of inclination? R,? G,? B of the common electrodes 110, 173, and 273 and the pixel electrodes 170, 171, and 271 is set to each of the electrodes 110, 173, 273, , 171, 271, and 371, and the extending direction of the reference line is the rubbing direction RD.

The bent angles? G of the common electrodes 110 and 173 and the pixel electrodes 170 and 171 formed in the green pixel region Pg with respect to the rubbing direction RD are about 10 to 20 degrees, The bent angles? R and? B of the common electrodes 110, 273 and 373 and the pixel electrodes 170, 271 and 371 of the prisms Pr and Pb are in the range of 10.5 to 21 degrees . The plurality of pixel electrodes 170, 171, 271, and 371 and the common electrodes 110, 173, 273, and 373 are formed so that? R and? B are in a range of 15.5 to 16 degrees when? G is 15 degrees .

The common electrodes 110, 173, 273 and 373 and the pixel electrodes 170 and 171 and 271 and 371 may be formed to have an angle of 10 to 20 degrees with respect to a direction perpendicular to the rubbing direction RD. In this case, the bent angle of the common electrodes 110, 173, 273, and 373 and the pixel electrodes 170, 171, 271, and 371 is the same as that of the common electrodes 110 and 173 of the green pixel region Pg, And the common electrodes 110 and 373 and the pixel electrodes 170 and 371 of the red pixel region Pr are the common electrodes 110 and 273 of the blue pixel region Pb and the common electrodes 110 and 273 of the blue pixel region Pb, 271). At this time, for example, the common electrodes 110 and 173 and the pixel electrodes 170 and 171 of the green pixel region Pg may have an angle of 20 degrees with respect to the direction perpendicular to the rubbing direction RD, The common electrodes 110 and 373 and the pixel electrodes 170 and 371 of the blue pixel region Pr and the common electrodes 110 and 273 and the pixel electrodes 170 and 271 of the blue pixel region Pb are perpendicular to the rubbing direction RD It can have an angle of 15 degrees with respect to one direction.

As described above, the common electrodes 110, 173, 273, and 373 and the pixel electrodes 170, 171, 271, and 371 have a bent structure with respect to the center thereof. The data line 135 also has a folded structure with respect to the center of each pixel region P so that the array substrate 101 has a zigzag shape as a whole.

Another characteristic feature of the array substrate 101 for a transverse electric field type liquid crystal display according to the present invention is that the width of the central common electrodes 173, 273 and 373 and the width of the central pixel electrodes 171, 271 and 371 dr , dg, and db are formed with different sizes in the pixel regions Pr, Pg, and Pb.

More specifically, the widths of the common electrodes 173, 273, and 373 and the center pixel electrodes 171, 271, and 371 at the center in the red, green and blue pixel regions Pr, Pg and Pb are dr, dg and db , Dr is characterized in that it is larger than dg and dg is formed to have a value larger than db. That is, the central pixel electrodes 171, 271 and 371 and the central common electrodes 173, 273 and 373 are formed so as to satisfy dr> dg> db. At this time, the outermost common electrode 110 and the outermost pixel electrode 170 overlapping the outermost common electrode 110 are preferably formed to have the same width in the red, green, and blue pixel regions Pr, Pg, and Pb. This is because the outermost common electrode 110 and the outermost pixel electrode 170 located at the outermost sides of the respective pixel regions Pr, Pg and Pb overlap each other to form the auxiliary storage capacitor, In order to prevent the overlapping width of the red pixel region Pr due to the decrease in the width thereof or the total capacitance of the storage capacitor to vary when the width of the red pixel region Pr increases and the overlap width increases. That is, the widths of the outermost common electrode 110 and the outermost pixel electrode 170 formed to overlap each other at the outermost edges of the pixel regions Pr, Pg, and Pb may be the same or different, The outermost common electrode 110 and the outermost pixel electrode 170 have the same width in all the pixel regions Pr, Pg, and Pb in order to advantage in terms of the total capacitance of the storage capacitors Respectively.

The relationship between the widths of the central pixel electrode and the central common electrode within each pixel region and the spacing distance between the adjacent common electrodes and pixel electrodes in a more detailed manner will be described in detail with reference to the drawings.

6 is a plan view of an array substrate for a transverse electric field type liquid crystal display according to an embodiment of the present invention in which an outermost pixel electrode 170 and central common electrodes 173 and 273 , 373 and the central pixel electrodes 171, 271, 371, respectively. In this case, the widths Pw1, Pw2 and Pw3 of the respective pixel regions are defined in principle as intervals between adjacent data wirings and data wirings. However, for convenience of description, Width.

The widths Pw1, Pw2 and Pw3 of the pixel regions Pr, Pg and Pb in the red, green and blue pixel regions Pr, Pg and Pb are all the same size (Pw1 = Pw2 = Pw3) and a portion having a difference in red, green, and blue pixel regions Pr, Pg, and Pb is a portion of the center pixel electrodes 171, 271, and 371 and the center common electrodes 173, 273, The widths dr, dg and db and the spacing wr, wg and wb between the electrodes 171, 271, 371, 173, 273 and 373.

More specifically, the widths Pw1, Pw2 and Pw3 of the red, green and blue pixel regions Pr, Pg and Pb have the same size (Pw1 = Pw2 = Pw3) and are provided in the blue pixel region Pb The width db of the center pixel electrode 271 and the center pixel common electrode 273 is smaller than the width dg of the pixel electrode 171 and the center pixel electrode 173 provided in the green pixel region Pg. and the width dr of the central pixel electrode 371 and the central pixel common electrode 373 provided in the red pixel region Pr is larger than the width of the central pixel electrode 171 (db <dg) provided in the green pixel region Pg. ) And the width dg of the center portion common electrode 173 (dr> dg). At this time, the width dg of each of the central common electrode 173 and the central pixel electrode 171 provided in the green pixel region Pg is usually determined in the range of about 2 mu m to 3.5 mu m, The width dr of each of the central common electrode 373 and the central pixel electrode 371 provided in the green pixel region Pg is greater than the width dg The width db of the central pixel electrode 271 and the central pixel common electrode 273 provided in the blue pixel region Pb is larger than the width of the central portion common to the green pixel region Pg And has a size smaller than the width dg of the electrode 173 and the central pixel electrode 171 by about 0.5 μm to 1 μm. At this time, since the outermost pixel electrode 170 and the outermost common electrode (not shown) provided in the red, green and blue pixel regions Pb all have the same size in the entire array substrate, The size is determined in the range of. In this case, the widths Pw1, Pw2, and Pw3 of the pixel regions Pr, Pg, and Pb have the same size (Pw1 = Pw2 = Pw3) at the spacing distance wr wg and wb between the neighboring electrodes The distances wr, wg and wb between the neighboring common electrodes and the pixel electrodes in the red, green and blue pixel regions Pr, Pg and Pb have a relation of wr <wg <wb.

Hereinafter, a cross-sectional structure of the transverse electric field type liquid crystal display device according to the present invention will be described with reference to FIGS. 7 and 8. FIG. Figs. 7 and 8 are cross-sectional views, respectively, of a portion cut along line VII-VII and VIII-VIII of Fig. 5, respectively. For convenience of explanation, a region where the thin film transistor which is a switching element is formed is referred to as a switching region TrA.

A transverse electric field type liquid crystal display device 100 according to the present invention includes an array substrate 101 including a thin film transistor Tr as a switching element, a gate wiring (not shown) and a data wiring 135, A color filter substrate 190 including green and blue color filter patterns 194a, 194b and 194c and a liquid crystal layer 188 sandwiched between these two substrates 101 and 190.

First, the color filter substrate 190 corresponds to the boundary of each pixel region Pr, Pg, Pb, that is, the portion where the gate and data wiring (not shown) of the array substrate 101 and the common wiring 109 are formed Green and blue color filter patterns 194a and 194b are formed in such a manner that the black matrix 192 is formed and overlapped with the black matrix 192 and sequentially repetitively corresponding to the pixel regions Pr, And a color filter layer 194 including a plurality of color filter layers 194a, 194c. Also, an overcoat layer 196 is formed covering the red, green and blue color filter patterns 194a, 194b, and 194c.

Gate wirings (not shown) extending in one direction and common wirings 109 are formed on the array substrate 101 facing the color filter substrate 190 having the above-described configuration, The region TrA is connected to the gate wiring (not shown) and a gate electrode 106 is formed. The outermost common electrode 110 is formed in each of the pixel regions Pr, Pg, and Pb by branching from the common wiring 109. At this time, the outermost common electrode 110 formed in each of the pixel regions Pr, Pg, and Pb has the same width in all the pixel regions Pr, Pg, and Pb.

In addition, a gate insulating film 117 is formed over the gate wiring (not shown), the gate electrode 106, the common wiring 109, and the outermost common electrode 110, The active layer 120a made of pure amorphous silicon and the semiconductor layer 120 composed of the ohmic contact layer 120b made of the impurity amorphous silicon are formed on the ohmic contact layer 120b. And source and drain electrodes 138 and 141 are formed. A data line 135 is formed in a zigzag shape at the boundary of each pixel region Pr, Pg, and Pb adjacent to the outermost common electrode 110 and on the entire surface of the substrate 101. At this time, 135 and the source electrode 138 are connected to each other. A semiconductor pattern 121 of a first pattern 121a and a second pattern 121b made of the same material forming the semiconductor layer 120 is formed under the data line 135. However, May be omitted. The reason why the semiconductor pattern 121 is formed under the data line 135 is that the semiconductor layer 120 and the source and drain electrodes 138 and 141 are formed at one time by a mask process The semiconductor patterns 121 may be formed under the data lines 135 or may be omitted as shown in FIG.

On the other hand, a protective layer 163 is formed on the data line 135 and the source and drain electrodes 138 and 141. The passivation layer 163 includes a drain contact hole 165 partially exposing the drain electrode 141 and a common contact hole (not shown) exposing a portion of the end of the outermost common electrode 110.

 In addition, the drain electrode 141 and the drain electrode 165 may be formed as a transparent conductive material such as indium tin oxide (ITO) or indium-zinc-oxide (IZO) The auxiliary pixel pattern 169 is formed so as to be in contact with the auxiliary pixel pattern 169. The auxiliary pixel pattern 169 branches off from the auxiliary pixel pattern 169 and has a symmetrically bent structure with respect to the center of each pixel region Pr, Pg, and Pb, The pixel electrode 170 and the plurality of central pixel electrodes 171, 271, and 371 are spaced apart from each other by a predetermined distance. The auxiliary pixel pattern 169 overlaps with the common wiring 109 to form a storage capacitor StgC together with the common wiring 109. The outermost pixel electrode 170 is connected to the outermost common electrode And overlaps the electrode 110 by a predetermined width to form an auxiliary storage capacitor.

The pixel electrode 170, 171, 271, and 371 are formed on the passivation layer 163 with the same transparent conductive material and contact with the outermost common electrode 110 through the common contact hole (not shown) A common pattern (not shown) is formed. The common pattern is branched from the auxiliary common pattern (not shown) and alternately arranged in parallel with the plurality of central pixel electrodes 171, 271 and 371 inside the outermost pixel electrode 170 And a plurality of central common electrodes 173, 273, and 373 are formed with a symmetrically bent structure with respect to the central portion. The width (dr, dg, db in FIG. 5) of the plurality of central pixel electrodes 171, 271 and 371 and the central common electrodes 173, 273 and 373 corresponds to the red, green and blue pixel regions Pr, Pg, The outermost and central pixel electrodes 170, 171, 271 and 371 and the outermost and central common electrodes 110, 173, 273, and 271 are formed to satisfy the relationship dr>dg> 373 are formed so as to satisfy the relationship of? G <? R?? B. The sizes of the electrodes (dr, dg, db in FIG. 5) and the bent angle (? R,? G,? B in FIG. 5) in the red and green pixel regions Pr and Pb and the blue pixel region Pb It has been explained in detail already, so it is omitted.

The present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the spirit of the present invention.

100: transverse electric field type liquid crystal display device 101: array substrate
103: gate wiring 106: gate electrode
109: common wiring 110: outermost common electrode
120: semiconductor layer 135: data wiring
138: source electrode 141: drain electrode
165: drain contact hole 168: common contact hole
169: auxiliary pixel pattern 170: outermost pixel electrode
171: Center pixel electrode of the green pixel region
172: auxiliary common pattern
173: central portion of the green pixel region common electrode
271: a pixel electrode at the center of the blue pixel region
273: Center pixel electrode of the blue pixel region
371: a pixel electrode at the center of the red pixel region
373: the center pixel electrode of the red pixel region
dr: width of the central common electrode and pixel electrode of the red pixel region
dg: width of the central common electrode and pixel electrode of the green pixel region
db: width of the central common electrode and pixel electrode of the blue pixel region
RB: rubbing direction
Pr, Pg, and Pb: red, green, and blue pixel regions
Pw1, Pw2, Pw3: Width of red, green and blue pixel regions
wr: spacing between neighboring electrodes in the red pixel region
wg: spacing between neighboring electrodes in green pixel area
wb: spacing between neighboring electrodes of the blue pixel region

Claims (10)

A color filter substrate having red, green, and blue color filter patterns;
An array substrate facing the color filter substrate and defining red, green, and blue pixel regions facing the red, green, and blue color filter patterns, respectively;
A gate wiring and a data wiring formed on an inner surface of the array substrate, the gate wiring and the data wiring crossing each other with a gate insulating film interposed therebetween;
A common wiring formed on the same layer so as to be spaced apart from and spaced apart from the gate wiring; an outermost common electrode branched from the common wiring and formed at an outermost periphery of each pixel region;
A thin film transistor formed near the intersection of the gate line and the data line;
And a plurality of first central portions connected to the drain electrodes of the thin film transistors and having a first width in the red pixel region and a central portion thereof having a first angle with respect to a rubbing direction perpendicular to the gate wiring, A plurality of second central pixel electrodes having a second width in the green pixel region and a central portion thereof symmetrically bent at a second angle with respect to a rubbing direction perpendicular to the gate wiring; A plurality of third central pixel electrodes having a third width in a pixel region and a central portion thereof symmetrically bent at a third angle with respect to a rubbing direction perpendicular to the gate lines;
A plurality of first central portion common electrodes connected to the outermost common electrode, the first central portion common electrodes having the first width in the red pixel region and alternating with and parallel to the plurality of first central pixel electrodes; A plurality of third central pixel electrodes having a first width, a second width, and a plurality of second central pixel electrodes alternately arranged in parallel with the plurality of second pixel electrodes; A plurality of third central common electrodes formed on the substrate;
A liquid crystal layer interposed between the color filter substrate and the array substrate,
/ RTI &gt;
Wherein the second width is less than the first width, is greater than the third width,
Wherein the second angle is smaller than the first and third angles, and the first angle is equal to the third angle.

delete delete The method according to claim 1,
And the widths of the red, green, and blue pixel regions are all the same.
The method according to claim 1,
Wherein each of the red, green, and blue pixel regions includes a first storage capacitor connected to the drain electrode and having an outermost common electrode and an outermost common electrode formed to overlap the outermost common electrode, Display device.
6. The method of claim 5,
Wherein the outermost pixel electrode and the plurality of first to third middle pixel electrodes are connected to the drain electrode by an auxiliary pixel pattern connecting one end of the pixel electrode and the auxiliary pixel pattern is overlapped with the common wiring, And a second storage capacitor in addition to the common wiring.
The method according to claim 6,
And one end of each of the first and second center portion common electrodes is connected to the outermost common electrode through an auxiliary common pattern connecting the ends of the first and second center portion common electrodes.
8. The method of claim 7,
Wherein the array substrate is provided with a protective layer covering the thin film transistor and having a drain contact hole exposing a drain electrode of the thin film transistor and a common contact hole exposing the outermost common electrode, The pixel pattern and the drain electrode are connected to each other, and the auxiliary common pattern is connected to the outermost common electrode through the common contact hole.
9. The method of claim 8,
Wherein the plurality of first to third center pixel electrodes, the plurality of first to third center common electrodes, and the outermost pixel electrodes are all formed of a transparent conductive material on the protective layer. Display device.
The method according to claim 1,
Wherein the data line is symmetrically bent at a central portion of each pixel region to form a zigzag shape with respect to the entire surface of the array substrate.

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