KR20070037146A - Panel and liquid crystal display including the same - Google Patents

Abstract

The present invention relates to a display panel and a liquid crystal display including the same. According to an exemplary embodiment of the present invention, a display panel includes a substrate, a gate line formed on the substrate, a pixel electrode formed on the substrate, the pixel electrode having a long side formed at an oblique angle with the gate line, and parallel to the long side of the pixel electrode. And a data line that is folded and overlaps with a portion of the pixel electrode, a first polarizing plate attached to the substrate, and a second polarizing plate facing the first polarizing plate.

TN, oblique line, pixel electrode, aperture ratio

Description

Display panel and liquid crystal display including the same {PANEL AND LIQUID CRYSTAL DISPLAY INCLUDING THE SAME}

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

FIG. 2 is a layout view of the liquid crystal display shown in FIG. 1 taken along the line II-II. FIG.

FIG. 3 is a layout view of the liquid crystal display shown in FIG. 1 taken along line III-III. FIG.

4 is a cross-sectional view showing a liquid crystal display device according to still another embodiment of the present invention.

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

6 is an equivalent circuit diagram of one pixel of a liquid crystal display according to another exemplary embodiment of the present invention.

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

FIG. 8 is a cross-sectional view of the liquid crystal display shown in FIG. 7 taken along the line VIII-VIII. FIG.

<Description of Drawing>

3: liquid crystal layer 11, 21: alignment film

81, 82: contact auxiliary member 100: thin film transistor array panel

110: insulating substrate 121: gate line

124: gate electrode 131: sustain electrode line

133a and 133b: sustain electrodes

140: gate insulating film 154: semiconductor

161, 163, and 165: ohmic contact members

171 and 179: data line 173: source electrode

175: drain electrode 180: protective film

181, 182, 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 a liquid crystal display including the same.

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

The liquid crystal display also includes a switching element connected to each pixel electrode and a plurality of signal lines such as a gate line and a data line for controlling the switching element and applying a voltage to the pixel electrode.

Among such liquid crystal displays, a twisted nematic TN type liquid crystal display using a twisted nematic liquid crystal having positive dielectric anisotropy is a liquid crystal molecule of a liquid crystal layer filled between two substrates when an electric field is not applied. They are parallel to the two substrates and are twisted in a spiral with a constant pitch, and thus have a twisted structure in which the long-axis alignment orientation of the liquid crystal molecules is continuously changed. When the electric field is formed between the electrodes formed on the two substrates, the long-axis alignment direction of the liquid crystal molecules is constantly arranged parallel to the direction of the electric field to have a structure perpendicular to the two substrates.

In the TN liquid crystal display, when the electric field is applied, the lateral electric field causes the orientation of the liquid crystal molecules to be disturbed, resulting in texture or light leakage and a long response time. When there is an optical axis misalignment of the polarizing plate, light leakage may be more severe at the outer edge of the pixel electrode.

The technical problem to be achieved by the present invention is to prevent the reduction of the aperture ratio without the occurrence of light leakage.

A liquid crystal display according to an exemplary embodiment of the present invention includes a substrate, a gate line formed on the substrate, a pixel electrode formed on the substrate, the pixel electrode having a long side formed at an oblique angle with the gate line, and parallel to the long side of the pixel electrode. And a data line that is bent at a center portion and overlaps a part of the pixel electrode, a first polarizer attached to the substrate, and a second polarizer facing the first polarizer.

The oblique angle may be 45 °.

The long side of the pixel electrode and the optical axis of the first polarizing plate may coincide.

An angle formed by an optical axis of the first polarizing plate and the second polarizing plate may be 90 °.

The organic layer may further include an organic layer formed between the pixel electrode and the data line.

The pixel electrode may include first and second subpixel electrodes that are separated from each other.

The first and second subpixel electrodes may be disposed to be divided up and down.

The first and second subpixel electrodes may be capacitively coupled.

The gate line may be disposed at a boundary between the first and second subpixel electrodes.

A gate electrode connected to the gate, a source electrode on the gate electrode, a source electrode connected to the data line, a drain electrode facing the source electrode, and a coupling electrode, respectively, wherein the drain electrode includes the first subpixel electrode. And the coupling electrode may overlap the second subpixel electrode.

The display apparatus may further include a plurality of color filters formed under the pixel electrode.

The display device may further include an overcoat formed between the pixel electrode and the color filter.

The display device may further include a storage electrode overlapping the pixel electrode.

According to another aspect of the present invention, a substrate, a gate line formed on the substrate, a pixel electrode formed on the substrate, the long side of which is parallel to the long side of the pixel electrode, the pixel electrode having an oblique angle with the gate line, and the pixel electrode A data line overlapping a portion of the substrate, a common electrode facing the pixel electrode, a liquid crystal layer positioned between the pixel electrode and the common electrode, a first polarizer attached on the substrate, and a first polarizer facing the first polarizer. There is provided a liquid crystal display device comprising two polarizing plates.

DETAILED DESCRIPTION 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, area, 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.

First, 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.

1 is a layout view of a display panel of a liquid crystal display according to an exemplary embodiment of the present invention, and FIGS. 2 and 3 are along the lines II-II and III-III of the liquid crystal display shown in FIG. 4 is a layout view cut away and illustrating a liquid crystal display according to another exemplary embodiment of the present invention.

1 to 3, the liquid crystal display according to the present exemplary embodiment includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other and a liquid crystal layer 3 interposed therebetween.

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

A plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on the substrate 110.

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 and end portions 129 having a large area for connection with another layer or an external driving circuit. A gate driving circuit (not shown) for generating a gate signal is 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, and includes a stem line extending substantially in parallel with the gate line 121 and a plurality of pairs of storage electrodes 133a and 133b separated therefrom. Each of the storage electrode lines 131 is positioned between two adjacent gate lines 121, and the stem line is closer to the bottom of the two gate lines. Each of the sustain electrodes 133a and 133b has a fixed end connected to the stem line and a free end opposite thereto. The fixed end of one sustain electrode 133b has a large area, and its free end is divided into two parts, a straight part and a bent part. However, the shape and arrangement of the storage electrode line 131 may be modified in various ways.

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, such as aluminum-based metal, silver-based metal, or copper-based metal, so as to reduce signal delay or voltage drop. In contrast, other conductive films are made of other materials, particularly materials having excellent physical, chemical, and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metals, chromium, titanium, and tantalum. Good examples of such a combination include a chromium bottom film and an aluminum (alloy) top film, and an aluminum (alloy) bottom film and a molybdenum (alloy) top film. However, the gate line 121 and the storage electrode line 131 may be made of various other metals or conductors.

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) and the like are formed on the gate insulating layer 140. The island-like semiconductor 154 has a wider width in the vicinity of the gate line 121 and the sustain electrode line 131 and covers them widely.

A plurality of linear and island ohmic contacts 161 and 165 are formed on the semiconductor 151. The ohmic contacts 161 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 linear ohmic contact 161 has a plurality of protrusions 163, and the protrusion 163 and the island-type ohmic contact 165 are paired and disposed in the semiconductor 154.

Side surfaces of the semiconductor 154 and the ohmic contacts 161, 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 161, 163, and 165 and the gate insulating layer 140.

The data line 171 transmits a data signal and mainly forms an oblique angle with the gate line 121, extends downward to intersect the gate line 121, and has a portion 171a that is bent sideways at the center. The oblique angle between the data line 171 and the gate line 121 is 45 degrees. Each data line 171 also crosses the storage electrode line 131 and runs between adjacent sets of storage electrodes 133a and 133b. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124 and an end portion 179 having a large area for connection with another layer or an external driving circuit. 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 with respect to the gate electrode 124. Each drain electrode 175 has one wide end portion 177 and the other end having a rod shape. The wide end portion 177 overlaps the storage electrode line 131, and the rod-shaped end portion is partially surrounded by the source electrode 173 bent in a J shape.

One gate electrode 124, one source electrode 173, and one drain electrode 175 together with the protrusion 154 of the semiconductor 151 form one thin film transistor (TFT). A channel of the transistor is formed in the protrusion 154 between the source electrode 173 and the drain electrode 175.

The data line 171 and the drain electrode 175 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). Examples of the multilayer structure include a double layer of chromium or molybdenum (alloy) lower layer and an aluminum (alloy) upper layer, and a triple layer of molybdenum (alloy) lower layer and aluminum (alloy) interlayer and molybdenum (alloy) upper layer. 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.

The ohmic contacts 161, 163, and 165 exist only between the semiconductor 154 below and the data line 171 and the drain electrode 175 thereon, thereby lowering the contact resistance therebetween. In most places, the width of the island-type semiconductor 154 is smaller than the width of the data line 171, but as described above, the width of the island-type semiconductor 154 is widened at the portion where the island-type semiconductor 154 meets to smooth the profile of the surface. Prevents disconnection. The semiconductors 151 and 154 have 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 conductors 171, 175, and 175 and the exposed semiconductor 154. The passivation layer 180 may be made of an organic insulator having a lower dielectric constant and having a larger thickness. Accordingly, even if the pixel electrode 191 and the data line 171 overlap, the parasitic capacitance can be prevented from being formed by insulating between the pixel electrode 191 and the data line 171. The organic insulator preferably has a dielectric constant of 4.0 or less, and may have photosensitivity. In addition, the passivation layer 180 may be formed of an inorganic insulator, and may have a double layer structure of the lower inorganic layer and the upper organic layer so as not to damage the exposed portions of the semiconductors 154a and 154b while maintaining excellent insulating properties of the organic layer. .

In the passivation layer 180, a plurality of contact holes 182 and 185 exposing the end portion 179 and the drain electrode 175 of the data line 171 are formed, respectively, and the passivation layer 180 and the gate insulating layer are formed. A plurality of contact holes 181 exposing the end portion 129 of the gate line 121 are formed at 140.

A plurality of pixel electrodes 191 and a plurality of contact assistants 81 and 82 are formed on the passivation layer 180. The pixel electrode 191 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. The pixel electrode 191 to which the data voltage is applied has a liquid crystal layer between the two electrodes by generating an electric field together with a common electrode (not shown) of the common electrode display panel 200 to which a common voltage is applied. The direction of liquid crystal molecules (not shown) is determined. The polarization of light passing through the liquid crystal layer is changed according to the direction of the liquid crystal molecules determined as described above. The pixel electrode 191 and the common electrode 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.

The pixel electrode 191 overlaps the storage electrode line 131 including the storage electrodes 133a and 133b. A capacitor in which the pixel electrode 191 and the drain electrode 175 electrically connected thereto overlap the storage electrode line 131 is called a "storage capacitor", and the storage capacitor enhances the voltage holding capability of the liquid crystal capacitor. .

The two long sides of the pixel electrode 191 form an oblique angle with the gate line 121, and the oblique angle may be 45 °. Therefore, the long sides of the data line 171 and the pixel electrode 191 are parallel to each other. In the center portion of the pixel electrode 191, the data line 171 may be bent to cross the pixel electrode 191 to partially overlap the pixel electrode 191. As a result, the overlapping area of the pixel electrode 191 and the data line 171 can be reduced to a minimum, thereby preventing the reduction of the aperture ratio.

The contact auxiliary members 81 and 82 are connected to the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 through the contact holes 181 and 182, respectively. The contact auxiliary members 81 and 82 compensate for and protect the adhesion between the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 and the external device.

Next, the color filter display panel 200 will be described.

A light blocking member 220 is formed on the substrate 210. The light blocking member 220 is also referred to as a black matrix and defines a plurality of opening regions facing the pixel electrode 191, and prevents light leakage between the pixel electrodes 191.

A plurality of color filters 230 are also formed on the substrate 210 and are arranged to almost fit into the opening region surrounded by the light blocking member 220. The color filter 230 may extend in the vertical direction along the pixel electrode 190 to form a stripe. 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 and the light blocking member 220. The overcoat 250 may be made of an insulator and 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 preferably made of a transparent conductive conductor such as ITO or IZO.

An alignment layer (not shown) for aligning the liquid crystal layer 3 is coated on the inner surfaces of the display panels 100 and 200, and one or more polarizers are disposed on the outer surfaces of the display panels 100 and 200. 11 and 22 are provided.

The optical axes of the polarizers 11 and 22 may be arranged perpendicular to each other. At this time, the long side of the pixel electrode 191 coincides with the optical axis of one of the polarizers 11 and 22. Therefore, the light leakage may be prevented because the axial electric field generated at the side of the pixel electrode 191 coincides with the optical axis of one of the polarizers 11 and 22.

FIG. 4 is a cross-sectional view of the liquid crystal display illustrated in FIGS. 1 to 3, illustrating FIG. 1, taken along the line II-II.

As shown in FIG. 4, the liquid crystal display according to the present exemplary embodiment includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, and a liquid crystal layer 3 interposed therebetween.

The layered structure of the display panels 100 and 200 according to the present exemplary embodiment is generally similar to the layered structure of the liquid crystal display shown in FIGS. 1 to 3.

Referring to the thin film transistor array panel 100, a plurality of gate lines 121 and a plurality of storage electrode lines (not shown) are formed on the substrate 110. The gate line 121 includes a plurality of gate electrodes 124 and end portions 129, and the storage electrode line includes a plurality of storage electrodes 133a and 133b. On the gate line 121 and the storage electrode line, a gate insulating layer 140, an island semiconductor 154, a plurality of linear ohmic contacts 161 having protrusions 163, and a plurality of island ohmic ohmic contacts 165 are sequentially formed. have. A plurality of data lines 171 including a source electrode 173 and an end portion 179 are formed on the ohmic contacts 161 and 165 and the gate insulating layer 140, and a passivation layer 180 is formed thereon. . A plurality of contact holes 185 are formed in the passivation layer 180 and the gate insulating layer 140. The pixel electrode 191 and the plurality of contact auxiliary members 81 and 82 are formed on the passivation layer 180, and an alignment layer (not shown) is formed thereon.

Referring to the common electrode display panel 200, the light blocking member 220, the common electrode 270, and an alignment layer (not shown) are formed on the insulating substrate 210.

One or more polarizers 11 and 22 are provided on the outer surfaces of the display panels 100 and 200.

However, unlike the liquid crystal display device shown in FIGS. 1 to 4, in the liquid crystal display device according to the present embodiment, the common electrode display panel 200 does not have the color filter 230, and instead, the protective film of the thin film transistor array panel 100 ( A plurality of color filters 230 are formed under the 180.

The color filter 230 extends vertically in the form of a band along the column of the pixel electrodes 191, and two neighboring color filters 230 overlap each other on the data line 171. The color filters 230 overlapping each other are formed of an organic layer to insulate the pixel electrode 191 from the data line 171. Therefore, even if the insulating layer 180 is not formed as an organic layer, parasitic capacitance is prevented from occurring at the portion where the pixel electrode 191 and the data line 171 overlap. In addition, the light blocking member may prevent light leakage between the pixel electrodes 191. In this case, the light blocking member 220 on the common electrode display panel 200 may be omitted, thereby simplifying the process.

The color filter 230 has a through hole 235 through which the contact hole 185 passes, and the through hole 235 is larger than the contact hole 185. The color filter 230 does not exist in the peripheral area where the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 are located.

A passivation layer (not shown) may be provided under the color filter 230.

Many features of the liquid crystal display illustrated in FIGS. 1 to 3 may correspond to the liquid crystal display illustrated in FIG. 4.

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

The liquid crystal panel assembly illustrated in FIG. 5 includes a lower panel (not shown) and an upper panel (not shown) facing each other, such as the liquid crystal panel assembly illustrated in FIGS. 1 to 4, and a liquid crystal layer interposed between these two display panels. (Not shown) and a pair of polarizers (not shown) attached to the outer surface of the display panel.

The layered structure of the liquid crystal panel assembly according to the present embodiment is usually the same as that of the liquid crystal panel assembly shown in FIGS. 1 to 4.

Referring to the lower panel 100, a plurality of gate conductors including a plurality of pairs of gate lines 121 and a plurality of storage electrode lines 131 are formed on the insulating substrate 100. A gate insulating film (not shown) is formed on the gate conductor 121. A plurality of island type semiconductors 154 are formed on the gate insulating film, and a plurality of island type ohmic contacts (not shown) are formed thereon. A data conductor including a plurality of data lines 171 and a plurality of pairs of upper and lower drain electrodes 175 is formed on the ohmic contact member. The data line 171 includes a source electrode 173 and an end portion 179, and the drain electrode 175 includes an extension 177. A passivation film (not shown) is formed on the data conductors 171, 173, and 175 and the exposed portion of the semiconductor 154, and a plurality of contact holes 185 are formed in the passivation film and the gate insulating film. The pixel electrode 191 having a 45 ° angle with the gate line 121 and a plurality of contact auxiliary members 81 and 82 are formed on the passivation layer 180. An alignment layer (not shown) is formed on the pixel electrode 191, the contact assistants 81 and 82, and the passivation layer 180.

Unlike the embodiment of FIGS. 1 to 4, the data line 171 mainly extends straight in the vertical direction and crosses the gate line 121 substantially vertically.

Referring to the upper panel 200, the light blocking member 220, the plurality of color filters 230, the overcoat 250, the common electrode 270, and the alignment layer (not shown) are disposed on the insulating substrate 210. Formed.

A liquid crystal display according to another exemplary embodiment of the present invention will now be described with reference to FIGS. 6 to 8.

6 is an equivalent circuit diagram of one pixel of a liquid crystal display according to another exemplary embodiment of the present invention. FIG. 7 is an example of the layout of the liquid crystal display shown in FIG. 6, and FIG. 8 is the liquid crystal shown in FIG. 7. It is sectional drawing which cut | disconnected and showed the display apparatus along the VIII-VIII line.

Referring to FIG. 6, the liquid crystal panel assembly according to the present exemplary embodiment includes a signal line including a plurality of gate lines GL and a plurality of data lines DL and a plurality of pixels PX connected thereto.

Each pixel PX includes a pair of first and second subpixels PXa and PXb and a coupling capacitor Ccp connected between the two subpixels PXa and PXb.

The first subpixel PXa includes a switching element Q connected to the corresponding gate line GL and the data line DL, a first liquid crystal capacitor Clca, and a storage capacitor Cst connected thereto. The second subpixel PXb includes a second liquid crystal capacitor Clcb connected to the coupling capacitor Ccp.

The switching element Q is also a three-terminal element of a thin film transistor or the like provided in the lower panel 100, the control terminal of which is connected to the gate line GL, and the input terminal of which is connected to the data line DL. The output terminal is connected to the liquid crystal capacitor Clca, the storage capacitor Cst, and the coupling capacitor Ccp.

The switching element Q applies the data voltage from the data line DL to the first liquid crystal capacitor Clca and the coupling capacitor Ccp according to the gate signal from the gate line GL, and the coupling capacitor Ccp The voltage is changed in magnitude and transferred to the second liquid crystal capacitor Clcb.

If the common voltage Vcom is applied to the storage capacitor Cst, and the capacitors Clca, Cst, Clcb, and Ccp are represented by the same reference numerals, the voltage Va charged in the first liquid crystal capacitor Clca is applied. And the voltage Vb charged in the second liquid crystal capacitor Clcb have the following relationship.

Vb = Va × [Ccp / (Ccp + Clcb)]

Since the value of Ccp / (Ccp + Clcb) is less than 1, the voltage Vb charged in the second liquid crystal capacitor Clcb is always smaller than the voltage Va charged in the first liquid crystal capacitor Clca. This relationship holds true even when the voltage applied to the storage capacitor Cst is not the common voltage Vcom.

An appropriate ratio of the first liquid crystal capacitor Clca voltage Va and the second liquid crystal capacitor Clcb voltage Vb can be obtained by adjusting the capacitance of the coupling capacitor Ccp.

Next, the structure of the liquid crystal panel assembly will be described in detail with reference to FIGS. 7 and 8.

Referring to FIGS. 7 and 8, the liquid crystal panel assembly according to the present exemplary embodiment also includes a lower panel 100 and an upper panel 200 facing each other and a liquid crystal layer 3 interposed between the two panels.

Referring to the lower panel 100, a plurality of gate lines 121 are formed on the insulating substrate 100. Each gate line 121 includes a plurality of gate electrodes 124a and 124b protruding upward and downward and a wide end portion 129 for connection with another layer or an external driving circuit.

The gate insulating layer 140 is formed on the gate line 121.

A plurality of island type semiconductors 154 are formed on the gate insulating layer 140, and a plurality of island type ohmic contact members 163a, 163b, and 165 are formed thereon. A data conductor including a plurality of data lines 171 and a plurality of pairs of first and second drain electrodes 175a and 175b is formed on the ohmic contacts 163a, 163b, and 165. The data line 171 includes a source electrode 173 and an end portion 179. The first and second drain electrodes 175a and 175b face the source electrode 173, respectively. One end of the second drain electrode 175 is referred to as a "coupled electrode" in the future.

The first and second gate electrodes 124a and 124b, the source electrode 173 and the first and second drain electrodes 175a and 175b, together with the semiconductor 154, form a thin film transistor, respectively, and the channel of the thin film transistor is a source electrode. It is formed in the semiconductor 154 between the (173) and the first / second drain electrode (175a, 175b).

 A passivation layer 180 is formed on the data conductors 171, 173, 175a, and 175b and the exposed portion of the semiconductor 154, and a plurality of contact holes 185 are formed in the passivation layer 180 and the gate insulating layer 140. It is. The pixel electrode 191 having a 45 ° angle with the gate line 121 and the plurality of contact auxiliary members 81 and 82 are formed on the passivation layer 180. An alignment layer 11 is formed on the pixel electrode 191, the contact assistants 81 and 82, and the passivation layer 180.

In the present exemplary embodiment, the pixel electrode 191 includes first and second subpixel electrodes 191a and 191b that are separated from each other, unlike the embodiments of FIGS. 1 to 4. The first subpixel electrode 191a is directly connected to the first drain electrode 175a through the contact hole 185, and the second subpixel electrode 191b is a coupling electrode extending from the second drain electrode 175b. Overlapping (176) forms a coupling capacitor (Ccp). Therefore, the second subpixel electrode 191b is capacitively coupled to the first subpixel electrode 191a. That is, the first subpixel electrode 191a receives a data voltage directly from the first drain electrode 175a, and the second subpixel electrode 191b receives a voltage lowered by the coupling capacitor Ccp.

In addition, the gate line 121 extends across the boundary between the first and second subpixel electrodes 191a and 191b.

The first and second subpixel electrodes 191a and 191b and the common electrode 270 of the upper panel 200 are connected to the first and second liquid crystal capacitors Clca / Clcb together with portions of the liquid crystal layer 3 therebetween. Thus, the applied voltage is maintained even after the thin film transistor Q is turned off.

Referring to the upper panel 200, the light blocking member 220, the plurality of color filters 230, the overcoat 250, the common electrode 270, and the alignment layer 21 are formed on the insulating substrate 210. have.

As described above, in the present invention, the optical field of the lateral electric field and the polarizer coincide to prevent light leakage, and the aperture ratio may be improved by minimizing the overlapping area between the data line and the pixel electrode.

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 (14)

Board, A gate line formed on the substrate, A pixel electrode formed on the substrate and having a long side formed at an oblique angle with the gate line; A data line parallel to the long side of the pixel electrode and overlapping a portion of the pixel electrode by bending at a central portion thereof; A first polarizer attached to the substrate, and A second polarizer facing the first polarizer Display panel comprising a. In claim 1, The oblique angle is 45 ° display panel. In claim 1, And a long side of the pixel electrode and an optical axis of the first polarizing plate to coincide with each other. In claim 1, An angle between an optical axis of the first polarizing plate and the second polarizing plate is 90 °. In claim 1, The display panel further comprises an organic layer formed between the pixel electrode and the data line. In claim 1, The pixel electrode includes first and second subpixel electrodes separated from each other. In claim 6, The first and second subpixel electrodes are disposed in a vertical direction. In claim 7, The first and second subpixel electrodes are capacitively coupled to each other. In claim 6, And the gate line is disposed at a boundary between the first and second subpixel electrodes. In claim 9, A gate electrode connected to the gate, A source electrode on the gate electrode and connected to the data line; First and second drain electrodes facing the source electrode, respectively; A coupling electrode connected to the second drain electrode Including, The first drain electrode is connected to the first subpixel electrode. The coupling electrode overlaps the second subpixel electrode. Display panel. In claim 1, And a plurality of color filters formed under the pixel electrode. In claim 11, The display panel further comprises an overcoat formed between the pixel electrode and the color filter. In claim 1, The display panel further includes a storage electrode overlapping the pixel electrode. Board, A gate line formed on the substrate, A pixel electrode formed on the substrate and having a long side formed at an oblique angle with the gate line; A data line parallel to a long side of the pixel electrode and overlapping a part of the pixel electrode; A common electrode facing the pixel electrode; A liquid crystal layer positioned between the pixel electrode and the common electrode, A first polarizer attached to the substrate, and A second polarizer facing the first polarizer Liquid crystal display comprising a.

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