KR20080101429A - Display panel - Google Patents

Abstract

A display panel is provided to prevent light leakage on pixel border area without reducing aperture ratio by forming more sub electrodes on the border area. A gate line(121) is formed on a substrate. A sustain electrode line(131) formed on the substrate is parallel with the gate line. An auxiliary electrode(20) is spread along the gate line. A data line(171) is insulated and intersects with the gate line. A plurality of thin film transistors are connected to the gate line and the data line. A pixel electrode(191) includes a first minor electrode(9a) connected to the thin film transistor, and a second minor electrode(9b) formed at the opposing side of the first minor electrode. A thin film transistor sustain electrode line is arranged between the first minor electrode and the second minor electrode.

Description

Display panel {DISPLAY PANEL}

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

FIG. 2 is a cross-sectional view of the liquid crystal display of FIG. 1 taken along the line II-II. FIG.

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

4 is a cross-sectional view of FIG. 3 taken along the line IV-IV.

* Description of Drawing Major Symbols *

3: liquid crystal layer 9a, 9b: small electrode

11, 21: alignment film 12, 22: polarizing plate

20: auxiliary electrode

31: liquid crystal molecule 27: incision

85: connection member 100: thin film transistor array panel

110 and 210: insulating substrates 121 and 129: gate lines

124: gate electrode 131: sustain electrode line

133: sustain electrode 140: gate insulating film

151, 154: semiconductor

152: low concentration doped region 153: source region

154a, 154b: channel region 155: drain region

159: source / drain region 160: interlayer insulating film

163 and 165: ohmic contact 171: data line

173: source electrode 175: drain electrode

180: protective film 185: contact hole

191: pixel electrode 200: common electrode display panel

210: insulating substrate 220: light blocking member

230: color filter 250: overcoat

270 common electrode

The present invention relates to a display panel, and in particular, to a display panel for a liquid crystal display device.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two display panels on which field generating electrodes such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed therebetween. Is applied to generate an electric field in the liquid crystal layer, thereby determining the orientation of liquid crystal molecules in the liquid crystal layer and controlling the polarization of incident light to display an image.

Among them, the vertical alignment mode liquid crystal display in which the long axis of the liquid crystal molecules are arranged perpendicular to the upper and lower display panels without an electric field applied to the display panel is high in contrast ratio and easy to implement a wide viewing angle.

However, it is an important disadvantage that the liquid crystal display device has a narrow viewing angle. In order to overcome this disadvantage, various methods for widening the viewing angle have been developed. Among them, liquid crystal molecules are oriented vertically with respect to the upper and lower substrates, and an incision pattern is formed on the pixel electrode and the opposite electrode, or the electrode is divided into a plurality of small electrodes. There is a way.

However, at the boundary between neighboring pixel electrodes, the direction of the electric field is reversed, and the magnitude of the electric field is different, so that the liquid crystal molecules are not properly aligned and light leakage occurs.

Accordingly, a technical problem of the present invention is to prevent light leakage at the boundary of neighboring pixel electrodes.

 The display panel according to the present invention for achieving the above object is a gate line formed on the substrate, a sustain electrode line formed on the substrate and parallel to the gate line, the auxiliary electrode formed on the substrate and extending along the gate line, insulated and crossed A pixel including a data line, a plurality of thin film transistors connected to the gate line and the data line, a first small electrode connected to the thin film transistor, and a second small electrode formed on the opposite side of the first small electrode to the gate line. And an electrode, and the thin film transistor and the sustain electrode line are disposed between the first small electrode and the second small electrode.

The boundary line of the auxiliary electrode may coincide with the upper boundary line and the lower boundary line of the neighboring pixel electrode, or may be positioned in the upper boundary line and the lower boundary line.

The same voltage may be applied to the auxiliary electrode and the common electrode.

The first small electrode and the second small electrode may have a rounded rectangle, and the first small electrode and the second small electrode may be connected to each other by a connection member.

The display device may further include a common electrode having an opposite substrate facing the substrate, a color filter formed on the opposite substrate, and a plurality of cutouts formed on the color filter.

The cutout may be disposed at a position corresponding to the center of the first small electrode and the second small electrode.

The light blocking member may further include a light blocking member formed on the opposite substrate and disposed at a position corresponding to the space between the first small electrode and the second small electrode.

The auxiliary electrode may be made of the same material as the gate line.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Next, a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

Example 1

FIG. 1 is a layout view of one pixel of a liquid crystal display according to an exemplary embodiment, and FIG. 2 is a cross-sectional view of the liquid crystal display of FIG. 1 taken along the line II-II.

1 and 2, a liquid crystal display according to an exemplary embodiment of the present invention includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, and a liquid crystal interposed between two display panels 100 and 200. Layer 3.

First, the thin film transistor array panel 100 will be described.

A blocking film 111 made of silicon oxide (SiO ₂ ), silicon nitride (SiN _x ), or the like is formed on an insulating substrate 110 made of transparent glass or plastic. The blocking film 111 may have a multilayer structure.

On the blocking film 111, a plurality of island-like semiconductors 151 made of polycrystalline silicon are formed. The island-like semiconductor 151 includes a vertical portion extending in the vertical direction and a horizontal portion connected to the vertical portion and extending in the horizontal direction. The ends of the longitudinal and transverse sections may be large in area for connection with other layers.

Each semiconductor 151 includes an intrinsic region containing conductive impurities and an intrinsic region containing almost no conductive impurities, and a heavily doped region having a high impurity concentration in the impurity region. ) And a lightly doped region with low impurity concentrations.

The intrinsic region includes two channel regions 154a and 154b that are spaced apart from each other. The channel regions 154a and 154b are positioned in the vertical and horizontal portions of the semiconductor 151, respectively. The high concentration impurity region includes a source region 153, a source / drain region 159, and a drain region 155 that are separated from the channel regions 154a and 154b. ). A portion of the drain region 155 is extended and the extended portion becomes the storage capacitor region 157.

The low concentration doped regions 152a and 152b located between the high concentration regions 153, 155 and 159 and the channel regions 154a and 154b are called lightly doped drain regions (LDD regions) and have different widths. Narrower than

A lightly doped region 152c may also be formed between the storage capacitor region 157 and the drain region 155. When the lightly doped regions 152a and 152b are formed using a separate mask, the lightly doped region 152c may not be formed between the storage capacitor region 157 and the drain region 155.

At this time, examples of the conductive impurity include P-type impurities such as boron (B) and gallium (Ga) and N-type impurities such as phosphorus (P) and arsenic (As). The lightly doped regions 152a and 152b prevent leakage current or punch through from the thin film transistor, and the lightly doped regions 152a and 152b are free of impurities. ) Can be replaced with an area.

A gate insulating layer 140 made of silicon nitride or silicon oxide is formed on the semiconductor 151 and the blocking layer 111. The gate insulating layer 140 may be formed of a multilayer by stacking silicon nitride and silicon oxide.

A plurality of gate lines 121, a plurality of storage electrode lines 131, and an auxiliary electrode 20 are formed on the gate insulating layer 140. The auxiliary electrode 20 extends in a direction parallel to the gate line 121 and is positioned at a boundary of the neighboring pixel electrode 191. The boundary line of the auxiliary electrode 20 may be disposed in the upper or lower boundary line, or coincide with the upper and lower boundary lines of the neighboring pixel electrode 191 so as not to reduce the aperture ratio.

The gate line 121 transmits a gate signal and includes a plurality of gate electrodes 124 protruding upward.

A portion of the gate line 121 overlaps with the channel region 154a positioned in the vertical portion of the semiconductor 151, and the gate electrode 124 is formed with the channel region 154b positioned in the horizontal portion of the semiconductor 151, respectively. Overlap. A portion of the gate line 121 overlapping the channel region 154a positioned in the vertical portion is used as the gate electrode of the thin film transistor.

One end portion of the gate line 121 may have a large area in order to connect to another layer or an external driving circuit, and when a gate driving circuit (not shown) generating a gate signal is integrated on the substrate 110. The gate line 121 may be directly connected to the gate driving circuit.

The storage electrode line 131 receives a predetermined voltage and includes a storage electrode 133 protruding downward. The storage electrode 133 overlaps the storage capacitor region 157.

The gate line 121 and the storage electrode line 131 may be formed of aluminum-based metal such as aluminum (Al) or aluminum alloy, silver-based metal such as silver (Ag) or silver alloy, copper-based metal such as copper (Cu) or copper alloy, or molybdenum ( It may be made of molybdenum-based metals such as Mo) or molybdenum alloy, chromium (Cr), tantalum (Ta) and titanium (Ti). However, they may have a multilayer structure including two conductive films (not shown) having different physical properties. One of the conductive films is made of a metal having low resistivity to reduce signal delay or voltage drop. In contrast, the other conductive film is made of a material having excellent physical, chemical, and electrical contact properties with other materials, particularly indium tin oxide (ITO) and indium zinc oxide (IZO).

Side surfaces of the gate line 121 and the storage electrode line 131 are inclined with respect to the surface of the substrate 110, and the inclination angle is preferably about 30 ° to about 80 °.

An interlayer insulating film 160 is formed on the gate line 121, the storage electrode line 131, and the gate insulating layer 140. The interlayer insulating layer 160 has an excellent planarization property and has an organic material having photo sensitivity, a low dielectric constant insulating material such as a-Si: C: O and a-Si: O: F formed by plasma chemical vapor deposition, Or silicon nitride, which is an inorganic material. The interlayer insulating layer 160 may be formed in a plurality of layers.

A plurality of contact holes 161 and 162 exposing the source region 153 and the drain region 155 are formed in the interlayer insulating layer 160 and the gate insulating layer 140, respectively.

A plurality of date lines 171 and a plurality of drain electrodes 175 that cross the gate line 121 are formed on the interlayer insulating layer 160.

Each data line 171 includes a source electrode 173 connected to the source region 153 through the contact hole 161. One end of the data line 171 may have a large area in order to connect with another layer or an external driving circuit, and when a data driving circuit (not shown) generating a data signal is integrated on the substrate 110 Line 171 may be directly connected to the data driving circuit.

The drain electrode 175 is separated from the source electrode 173 and is connected to the drain region 155 through the contact hole 162. The drain electrode 175 overlaps the storage electrode 133 of the storage electrode line 131.

The drain electrode 175 and the source electrode 173 are preferably made of a refractory metal such as molybdenum, chromium, tantalum and titanium, or an alloy thereof, and include a refractory metal film (not shown) and a low resistance conductive film. It may have a multilayer structure including (not shown). However, the data line 171 and the drain electrode 175 may be made of various metals or conductors.

The side of the data line 171 and the drain electrode 175 may also be inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

On the data line 171, the drain electrode 175, and the interlayer insulating layer 160, a passivation 180 made of an organic material having excellent planarization characteristics is formed. The passivation layer 180 may be made of only a photo process using a material having photosensitivity. The passivation layer 180 may be formed of plasma enhanced chemical vapor deposition (PECVD), such as a-Si: C: O, a-Si: O: F, or a dielectric constant of 4.0 or less, such as low dielectric constant or silicon nitride. It may be made of an inorganic material, and may include a lower film made of an inorganic material and an upper film made of an organic material.

The passivation layer 180 has a plurality of contact holes 185 exposing the drain electrode 175.

A plurality of pixel electrodes 191 made of a transparent conductive material such as indium zinc oxide (IZO) or indium tin oxide (ITO) or an opaque reflective conductive material such as aluminum or silver are formed on the passivation layer 180. .

Each pixel electrode 191 includes a first small electrode 9a and a second small electrode 9b, and the first small electrode 9a and the second small electrode 9b are rectangular with rounded corners. The first small electrode 9a and the second small electrode 9b are connected to each other by the connecting member 85.

The connection member 85 includes a vertical portion connecting the first small electrode 9a and the second small electrode 9b and a protrusion for connecting the other layer.

Most of the gate electrode 124, the gate line 121, the storage electrode 133, the storage electrode line 131, the drain electrode 175, and the semiconductor 151 are formed of the first small electrode 9a and the second small electrode ( It is located between 9b).

The protrusion is physically and electrically connected to the drain electrode 175 through the contact hole 185, and receives a data voltage from the drain electrode 175 and transfers the data voltage to the pixel electrode 191.

The pixel electrode 191 to which the data voltage is applied is formed between the two electrodes 191 and 270 by generating an electric field together with the common electrode 270 of the common electrode display panel 200 to which the common voltage is applied. The direction of the liquid crystal molecules of the liquid crystal layer 3 is determined. The polarization of light passing through the liquid crystal layer 3 varies according to the direction of the liquid crystal molecules determined as described above. The pixel electrode 191 and the common electrode 270 form a capacitor (hereinafter, referred to as a "liquid crystal capacitor") to maintain an applied voltage even after the thin film transistor is turned off.

In order to enhance the voltage holding capability of the liquid crystal capacitor, a holding capacitor can be further formed.

In the embodiment of the present invention, the storage capacitor is formed by overlapping the storage capacitor region 157 and the storage electrode 133 with the gate insulating layer 140 interposed therebetween. The data voltage input to the pixel electrode 191 from the data line 171 is applied to the storage capacitor region 157.

As in the embodiment of the present invention, when the storage capacitor is formed of the storage capacitor region 157 and the storage electrode 133, the gate insulating layer 140 is thinner than the insulating film formed on the other layer, so that the storage capacitor has a sufficient storage capacity. Can be obtained.

In an embodiment of the present invention, the pixel electrode 191 and the storage electrode 133 overlap with the storage electrode 133, the drain electrode 175, and the passivation layer 180 with the interlayer insulating layer 160 therebetween. To form a holding capacitor. The storage capacitors of the capacitors may have a smaller capacity than the storage capacitors formed by the storage capacity region 157 and the storage electrode 133, and thus may be used as auxiliary storage capacitors.

In addition, in the embodiment of the present invention, the gate line 121, the storage electrode line 131, and the thin film transistor are disposed at a portion where the connection member 85 between the first small electrode 9a and the second small electrode 9b is positioned. By forming, the first small electrode 9a and the second small electrode 9b are minimized from being covered by them. Therefore, reduction of the aperture ratio of the pixel electrode 191 can be minimized.

Next, the common electrode display panel 200 will be described.

A plurality of color filters 230 are formed on an insulating substrate 210 made of transparent glass, plastic, or the like, and the color filters 230 may extend in a vertical direction along a column of pixel electrodes 191 to form a band. Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue.

A light blocking member (not shown) may be formed under the color filter 230. The light blocking member prevents light leakage between the pixel electrodes 191 and may be formed between the first small electrode 9a and the second small electrode 9b.

In the exemplary embodiment of the present invention, the light blocking member is not formed in the region corresponding to the gate line 121. Therefore, the reduction of the aperture ratio due to the light blocking member can be reduced.

An overcoat 250 is formed on the color filter 230. The overcoat 250 may be made of an (organic) insulator and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat 250 may be omitted.

The common electrode 270 is formed on the overcoat 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO. A plurality of cutouts 27 are formed in the common electrode 270. Each cutout 27 may be circular or rectangular with rounded corners, corresponding to the central portions of the small electrodes 9a and 9b.

Alignment layers 11 and 21 are coated on inner surfaces of the display panels 100 and 200, and they may be vertical alignment layers. Polarizers 12 and 22 are provided on the outer surfaces of the display panels 100 and 200, and polarization axes of the two polarizers 12 and 22 are orthogonal to each other. In the case of a reflective liquid crystal display, one of the two polarizers 12 and 22 may be omitted.

The liquid crystal display according to the present exemplary embodiment may further include a phase retardation film (not shown) for compensating for the delay of the liquid crystal layer 3. The liquid crystal display may also include a polarizer 12 and 22, a phase retardation film, display panels 100 and 200, and a backlight unit (not shown) for supplying light to the liquid crystal layer 3.

The liquid crystal layer 3 has negative dielectric anisotropy, and the liquid crystal molecules 31 of the liquid crystal layer 3 are oriented such that their major axes are substantially perpendicular to the surfaces of the two display panels 100 and 200 in the absence of an electric field. have. Therefore, incident light does not pass through the polarizers 12 and 22 that are perpendicular to each other, but are blocked.

When a common voltage is applied to the common electrode 270 and a data voltage is applied to the pixel electrode 191, an electric field that is substantially perpendicular to the surfaces of the display panels 100 and 200 is generated. Liquid crystal molecules (not shown) attempt to change their directions so that their long axis is perpendicular to the electric field direction in response to the electric field.

The cutouts 27 of the field generating electrodes 191 and 270 and the sides of the pixel electrode 191 distort the electric field to create horizontal components that determine the inclination direction of the liquid crystal molecules 31. The horizontal component of the electric field is substantially perpendicular to the sides of the cutout 27 and the pixel electrode 191. Since the liquid crystal is inclined by the four sides of the first small electrode 9a and the second small electrode 9b and the electric field formed by the cutouts 27, the inclined direction is approximately four directions. As described above, when the liquid crystal molecules 31 are inclined in various directions, the reference viewing angle of the liquid crystal display becomes large.

Meanwhile, the same voltage as that of the common electrode 270 is applied to the auxiliary electrode 20.

If the voltages of the auxiliary electrode 20 and the common electrode 270 are the same, the electric line of force that is concentrated between the common electrode 270 and the pixel electrode 191 is a region between the pixel electrode 191 and the auxiliary electrode 20. Is dispersed. Therefore, the electric field between the pixel electrode 191 and the common electrode 270 is weakened at the boundary between two neighboring pixel electrodes 191.

Accordingly, the liquid crystal molecules 31 positioned on the upper and lower boundary portions of the neighboring pixel electrodes 191 have little change in orientation due to the weakening of the electric field formed between the pixel electrodes 191 and the common electrode 270. In particular, no light leakage occurs because an electric field in one pixel region affects neighboring pixel regions.

In addition, even though the liquid crystal molecules 31 are not properly aligned between the upper and lower boundary lines of the neighboring pixel electrode 191, the auxiliary electrode 20 is used as the light blocking member so that light leakage does not occur.

<Example 2>

3 is a layout view of a liquid crystal display according to another exemplary embodiment. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

First, the thin film transistor array panel will be described.

A plurality of gate lines 121, storage electrode lines 131, and auxiliary electrodes 20 are formed on the transparent glass or the insulating substrate.

The gate line 121 transmits a gate signal and mainly extends in a horizontal direction. Each gate line 121 includes a plurality of gate electrodes 124 protruding upward.

The gate line 121 may have a wide end portion for connection with another layer or an external driving circuit. A gate driving circuit (not shown) for generating a gate signal may be mounted on a flexible printed circuit film (not shown) attached to the substrate 110 or directly mounted on the substrate 110, It may be integrated into the substrate 110. When the gate driving circuit is integrated on the substrate 110, the gate line 121 may extend to be directly connected to the gate driving circuit.

The storage electrode line 131 receives a predetermined voltage, extends in parallel with the gate line 121, and includes the storage electrode 133 protruding downward.

The auxiliary electrode 20 extends in a direction parallel to the gate line 121 and is positioned at a boundary of the neighboring pixel electrode 191. The boundary line of the auxiliary electrode 20 may be disposed in the upper or lower boundary line of the upper and lower boundary lines of the neighboring pixel electrode 191 so as not to reduce the aperture ratio. The common voltage is applied to the auxiliary electrode 20 as in the first embodiment.

The gate line 121 and the storage electrode line 131 may be formed of the same material as in the exemplary embodiment shown in FIGS. 1 and 2.

Side surfaces of the gate line 121 and the storage electrode line 131 are inclined with respect to the surface of the substrate 110, and the inclination angle is preferably about 30 ° to about 80 °.

A gate insulating layer 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate line 121 and the storage electrode line 131.

A plurality of island-like semiconductors 154 made of hydrogenated amorphous silicon (amorphous silicon is abbreviated a-Si) is formed on the gate insulating layer 140. The island semiconductor 154 is positioned over the gate electrode 124.

Isometric ohmic contacts 163 and 165 are formed on the semiconductor 154. The ohmic contacts 163 and 165 may be made of a material such as n + hydrogenated amorphous silicon in which n-type impurities such as phosphorus are heavily doped, or may be made of silicide. The island-like ohmic contacts 163 and 165 are paired and disposed on the semiconductor 154.

Side surfaces of the semiconductor 154 and the ohmic contacts 163 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is about 30 ° to 80 °.

A plurality of data lines 171 and a plurality of drain electrodes 175 are formed on the ohmic contacts 163 and 165 and the gate insulating layer 140.

The data line 171 transmits a data signal and mainly extends in the vertical direction to cross the gate line 121 and the storage electrode line 131. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124, and an end portion of the data line 171 is connected to another layer or an external driving circuit. It can be wide. A data driving circuit (not shown) for generating a data signal is mounted on a flexible printed circuit film (not shown) attached to the substrate 110, directly mounted on the substrate 110, or integrated in the substrate 110. Can be. When the data driving circuit is integrated on the substrate 110, the data line 171 may be extended to be directly connected to the data driving circuit.

The drain electrode 175 is separated from the data line 171 and faces the source electrode 173 around the gate electrode 124. A portion of the drain electrode 175 extends to overlap the storage electrode 133.

One gate electrode 124, one source electrode 173, and one drain electrode 175 together with the semiconductor 154 form one thin film transistor (TFT), and a channel of the thin film transistor. ) Is formed in the semiconductor 154 between the source electrode 173 and the drain electrode 175.

The data line 171 and the drain electrode 175 may also be formed of the same material as the data line 171 and the drain electrode 175 described with reference to FIGS. 1 and 2.

The side of the data line 171 and the drain electrode 175 may also be inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

The ohmic contacts 163 and 165 exist only between the semiconductor 154 thereunder and the data line 171 and the drain electrode 175 thereon to lower the contact resistance therebetween.

The semiconductor 154 includes portions exposed between the source electrode 173 and the drain electrode 175 and not covered by the data line 171 and the drain electrode 175.

A passivation layer 180 is formed on the data line 171, the drain electrode 175, and the exposed semiconductor 154.

The passivation layer 180 may be made of an inorganic insulator or an organic insulator, and the surface thereof may be flat. Examples of the inorganic insulator include silicon nitride and silicon oxide. The organic insulator may have photosensitivity and its dielectric constant is preferably about 4.0 or less. However, the passivation layer 180 may have a double layer structure of the lower inorganic layer and the upper organic layer so as not to damage the exposed portion of the semiconductor 154 while maintaining excellent insulating properties of the organic layer.

The passivation layer 180 has a plurality of contact holes 185 exposing the drain electrode 175.

A plurality of pixel electrodes 191 made of IZO or ITO is formed on the passivation layer 180.

Each pixel electrode 191 includes a first small electrode 9a and a second small electrode 9b, and the first small electrode 9a and the second small electrode 9b have a rounded corner. The first small electrode 9a and the second small electrode 9b are connected in a line by the connecting member 85.

The connecting member 85 includes a vertical portion connecting the first small electrode 9a and the second small electrode 9b and a protrusion for connecting with another layer.

The gate electrode 124, the gate line 121, the sustain electrode 133, the sustain electrode line 131, the drain electrode 175, and the semiconductor 154 are formed of the first small electrode 9a and the second small electrode 9b. Located in between.

The protrusion is physically and electrically connected to the drain electrode 175 through the contact hole 185, and receives a data voltage from the drain electrode 175 to transfer the data voltage to the pixel electrode 191.

In the exemplary embodiment of the present invention, a portion of the storage electrode 133 and the drain electrode 175 overlap the gate insulating layer 140 to form a storage capacitor.

Next, the common electrode display panel 200 will be described.

The light blocking member 220 is formed on the insulating substrate 210 made of transparent glass, plastic, or the like. The light blocking member 220 prevents light leakage between the pixel electrodes 191 and corresponds to between the first small electrode 9a and the second small electrode 9b. As illustrated in FIGS. 1 and 2, the light blocking member 220 may be omitted. In the exemplary embodiment of the present invention, the light blocking member is not formed in the region corresponding to the gate line 121. Therefore, the reduction of the aperture ratio due to the light blocking member can be reduced.

The color filter 230 is formed on the light blocking member 220 and the substrate 210. The color filter 230 may extend in the vertical direction along the pixel electrode 191 to form a band. Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue.

An overcoat 250 is formed on the color filter 230. The overcoat 250 may be made of an (organic) insulator, protects the color filter 230, prevents the color filter 230 from being exposed, and provides a flat surface.

The common electrode 270 is formed on the overcoat 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO. A plurality of cutouts 27 are formed in the common electrode 270. Each cutout 27 may be round or rectangular with rounded corners, corresponding to the central portions of the small electrodes 9a and 9b.

Alignment layers 11 and 21 are coated on inner surfaces of the display panels 100 and 200, and they may be vertical alignment layers.

Polarizers 12 and 22 are provided on outer surfaces of the display panels 100 and 200, and polarization axes of the two polarizers 12 and 22 are orthogonal to each other.

The liquid crystal display may further include a phase delay film (not shown) for compensating for the delay of the liquid crystal layer 3. The liquid crystal display may also include a polarizer 12 and 22, a phase retardation film, display panels 100 and 200, and an illumination unit (not shown) for supplying light to the liquid crystal layer 3.

The liquid crystal layer 3 has negative dielectric anisotropy and the liquid crystal molecules of the liquid crystal layer 3 are aligned such that their major axes are substantially perpendicular to the surfaces of the two display panels 100 and 200 when there is no electric field. Therefore, incident light does not pass through the quadrature polarizers 12 and 22 and is blocked.

As described above, the present invention further prevents light leakage due to abnormal behavior of the liquid crystal molecules without reducing the aperture ratio by further forming an auxiliary electrode at the boundary between neighboring pixel electrodes.

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

Claims (9)

A gate line formed on the substrate, A storage electrode line formed on the substrate and parallel to the gate line; An auxiliary electrode formed on the substrate and extending along the gate line; A data line insulated from and intersecting the gate line, A plurality of thin film transistors connected to the gate line and the data line, A pixel electrode including a first small electrode connected to the thin film transistor, and a second small electrode formed on an opposite side of the first small electrode with respect to the gate line; Including, The thin film transistor and the storage electrode line are disposed between the first small electrode and the second small electrode. In claim 1, The boundary line of the auxiliary electrode corresponds to an upper boundary line and a lower boundary line of neighboring pixel electrodes. In claim 1, The boundary line of the auxiliary electrode is disposed in the upper boundary line and the lower boundary line of the neighboring pixel electrode. In claim 1, The display panel is applied with the same voltage to the auxiliary electrode and the common electrode. In claim 1, The first small electrode and the second small electrode is a quadrangular corner, The display panel is connected to the first small electrode and the second small electrode by a connecting member. In claim 1, An opposite substrate facing the substrate, A color filter formed on the counter substrate, and Common electrode having a plurality of cutouts formed on the color filter Display panel further including. In claim 6, The cutout is disposed in a position corresponding to the center of the first small electrode and the second small electrode. In claim 7, And a light blocking member formed on the opposing substrate and disposed at a position corresponding to between the first small electrode and the second small electrode. In claim 1, The auxiliary electrode is made of the same material as the gate line.

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