KR101240646B1 - Liquid crystal display - Google Patents

Abstract

The present invention includes a substrate and a pixel electrode formed on the substrate, each pixel electrode including a first and a second subpixel electrode, each pixel electrode comprising at least two first electrodes and at least one second electrode adjacent up and down, respectively. An electrode, each of the first and second electrodes including at least two parallelogram electrodes having different inclination directions, wherein the first subpixel electrode includes the first electrode, and the second subpixel An electrode is a liquid crystal display including at least one of the first electrode and the second electrode. As described above, in the present invention, the aperture ratio may be further improved, the side visibility may be improved, the vertical line representation may be improved, and the transmittance may be increased in the medium-large display device. In addition, the capacitance of the storage capacitor, the area of the pixel electrode, and the distance between the data lines can be freely adjusted, and the overlapping area between the data lines and the pixel electrodes can be easily adjusted, so that the capacitance of the parasitic capacitor can be appropriately adjusted.

Zcell, double boomerang, SPVA, visibility structure, high opening ratio, organic film

Description

[0001] LIQUID CRYSTAL DISPLAY [0002]

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

2 is an equivalent circuit diagram of two subpixels of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is an equivalent circuit diagram of one pixel of a liquid crystal panel assembly according to an embodiment of the present invention;

4 is a layout view of a lower panel of a liquid crystal panel assembly according to an exemplary embodiment of the present invention.

5 is a layout view of an upper panel of a liquid crystal panel assembly according to an exemplary embodiment of the present invention.

FIG. 6 is a layout view of a liquid crystal panel assembly including the lower panel of FIG. 4 and the upper panel of FIG. 5.

FIG. 7 is a cross-sectional view of the liquid crystal panel assembly of FIG. 6 taken along the line VII-VII. FIG.

8A to 8C are plan views of electrode pieces serving as a basis for the subpixel electrodes shown in FIGS. 4 to 7,

9 is a layout view of a lower panel of a liquid crystal panel assembly according to another exemplary embodiment of the present invention.

10 is a layout view of an upper panel of a liquid crystal panel assembly according to another exemplary embodiment of the present invention.

FIG. 11 is a layout view of a liquid crystal panel assembly including the lower panel of FIG. 9 and the upper panel of FIG. 10.

FIG. 12 is a cross-sectional view of the liquid crystal panel assembly of FIG. 11 taken along the line XII-XII.

FIG. 13 is an equivalent circuit diagram of one pixel of a liquid crystal panel assembly according to another exemplary embodiment of the present invention.

14 is a layout view of a liquid crystal panel assembly according to another exemplary embodiment of the present invention.

FIG. 15 is a cross-sectional view of the liquid crystal panel assembly of FIG. 14 taken along the line XV-XV.

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

<Description of Drawing>

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

71Ra-71Rd2, 71Ga-71Gd, 71Ba-71Bd2: common electrode incision

91a-91d and 92: pixel electrode cutouts

81, 81a, 81b, 82, 82a, 82b: contact auxiliary member

110, 210: substrate

121, 121a, 121b, 129a, 129b: gate line

124, 124a, 124b, 124c, and 124d: gate electrode

131, 137, 137a, and 137b: sustain electrode line 140: gate insulating film

154, 154a-154d: semiconductor

161, 163a-163c, and 165a-165c: resistive contact members

171, 171c, 171d, 179, 179c, 179d: data line

173, 173a-173d: source electrode

175a-175d, 176a, 177a-177d: drain electrode

180: shield

181, 181a, 181b, 182, 182c, 182d, 185, 185a-185d: contact hole

191Ra-191Rd2, 191Ga-191Gd, 191Ba-191Bd2, 192R, 192B: pixel electrode

220: light blocking member 230: color filter

250: overcoat 270: common electrode

300: liquid crystal panel assembly 400: gate driver

500: data driver 600: signal controller

800: a gradation voltage generating section

The present invention relates to a liquid crystal display device.

2. Description of the Related Art A liquid crystal display device is one of the most widely used flat panel display devices and is composed of two display panels in which electric field generating electrodes such as a pixel electrode and a common electrode are formed and a liquid crystal layer interposed therebetween, To generate an electric field in the liquid crystal layer, thereby determining the orientation of the liquid crystal molecules in the liquid crystal layer and controlling the polarization of the incident light to display an image.

The liquid crystal display device further 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 to apply a voltage to the pixel electrode.

Among such liquid crystal display devices, a liquid crystal display device having a vertically aligned mode 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 liquid crystal display device is gaining attention due to its large contrast ratio and wide reference viewing angle. . Herein, the reference viewing angle means a viewing angle with a contrast ratio of 1:10 or a luminance reversal limit angle between gradations.

As means for realizing a wide viewing angle in a vertical alignment mode liquid crystal display device, there are a method of forming a cut portion in an electric field generating electrode and a method of forming a projection on an electric field generating electrode. Since the inclination and the projection can determine the direction in which the liquid crystal molecules are tilted, the reference viewing angle can be widened by using these to disperse the oblique directions of the liquid crystal molecules in various directions.

In order to improve side visibility, one pixel is divided into two subpixels, two subpixels are capacitively coupled, and a voltage is directly applied to one subpixel and a voltage drop is caused by capacitive coupling to the other subpixel. A method of changing the transmittances by changing the voltages of the two subpixels has been proposed.

However, this method does not exactly match the transmittance of the two subpixels to the desired level, and in particular, the light transmittance is different depending on the color, and thus this cannot be done even though the voltage combination for each color must be different. In addition, a decrease in the aperture ratio may occur due to the addition of a conductor for capacitive coupling, and the transmittance may decrease due to a voltage drop caused by the capacitive coupling.

In addition, the part with protrusions or cutouts is difficult to transmit light, so the more they are, the lower the opening ratio. In order to increase the aperture ratio, an ultra-high opening ratio structure in which a pixel electrode is widened is proposed. However, in this case, the distance between the pixel electrodes is close and the distance between the pixel electrode and the data line is also close, so that a strong lateral field is formed near the edge of the pixel electrode. Due to this lateral electric field, the alignment of the liquid crystal molecules is disturbed, resulting in texture or light leakage and a long response time.

In addition, the liquid crystal display of the vertical alignment mode is less lateral visibility than the front visibility. For example, in the case of a patterned vertically aligned (PVA) type liquid crystal display device having an incision, the image becomes brighter toward the side, and in severe cases, the luminance difference between the high grays is disappeared, and the picture may be clumped.

One technical problem to be achieved by the present invention is to improve transmittance while increasing the aperture ratio of the liquid crystal display device.

Another technical problem to be achieved by the present invention is to improve side visibility.

Another technical problem to be achieved by the present invention is to improve the vertical line representation, facilitate the application of voltage to each subpixel electrode, and increase the flexibility of the liquid crystal panel assembly arrangement.

A liquid crystal display according to an exemplary embodiment of the present invention includes a substrate and a pixel electrode formed on the substrate, the pixel electrode including first and second subpixel electrodes, respectively, wherein the pixel electrode is at least two adjacent top and bottom sides. A first electrode and at least one second electrode, each of the first and second electrodes including at least two parallelogram electrodes having different inclination directions, wherein the first subpixel electrode is configured to support the first electrode. The second subpixel electrode includes at least one of the first electrode and the second electrode.

The height of the first electrode and the height of the second electrode may be different from each other.

The first electrode of the first subpixel electrode may be adjacent to the left and right of the first electrode of the second subpixel electrode.

The pixel electrode may be aligned left or right.

The electrode piece may include a pair of hypotenuses that are parallel to each other, and the hypotenuse of the electrode piece of the first electrode may be alternately arranged with the hypotenuse of the electrode piece of the second electrode.

A liquid crystal display according to another exemplary embodiment of the present invention includes a substrate and a pixel electrode formed on the substrate, the pixel electrode including first and second subpixel electrodes, respectively, wherein the pixel electrode is at least one adjacent up and down. A first electrode and at least one second electrode, each of the first and second electrodes including at least two parallelogram electrodes having different inclination directions, the height of the first electrode and the second electrode Heights are different.

The first subpixel electrode may include the first electrode, and the second subpixel electrode may include two or more second electrodes.

The second subpixel electrode may include three second electrodes adjacent to each other and connected to each other, and the first subpixel electrode may be aligned with a second electrode located at the center of the second electrodes.

The pixel electrode may be aligned left or right.

The height of the first electrode may be higher than the height of the second electrode and less than twice.

The area of the second subpixel electrode may be 1.1 to 3 times the area of the first subpixel electrode.

And a common electrode facing the pixel electrode and having a cutout portion, wherein the electrode piece includes a pair of hypotenuses parallel to each other, and the cutoff portion crosses the first and second subpixel electrodes, and the hypotenuse side of the electrode piece. It may include an oblique portion parallel to the.

Voltages of the first subpixel electrode and the second subpixel electrode may be different from each other.

A first thin film transistor connected to the first subpixel electrode, a second thin film transistor connected to the second subpixel electrode, a first signal line connected to the first thin film transistor, and connected to the second thin film transistor The display device may further include a second signal line and a third signal line connected to the first and second thin film transistors and intersecting the first and second signal lines.

The first and second thin film transistors may be turned on according to signals from the first and second signal lines, respectively, to transmit signals from the third signal line.

The first and second thin film transistors may be turned on according to signals from the third signal line, respectively, to transmit signals from the first and second signal lines.

The display device may further include a fourth signal line extending along a boundary between the first electrode and the second electrode.

The first and second thin film transistors may include first and second drain electrodes respectively overlapping the fourth signal line.

The display device may further include a fourth signal line extending along the horizontal center line of the first electrode and a fifth signal line extending along the horizontal center line of the second electrode.

The first and second thin film transistors may include first and second drain electrodes overlapping the fourth and fifth signal lines, respectively.

The first subpixel electrode and the second subpixel electrode may be capacitively coupled.

A liquid crystal display according to another exemplary embodiment of the present invention includes a substrate and a plurality of pixel electrode sets formed on the substrate, each of the pixel electrode sets including a plurality of pixel electrodes, and each of the pixel electrodes may be mutually provided. First and second subpixel electrodes separated from each other, each of the first and second subpixel electrodes including at least two parallelogram electrodes having different inclination directions, and among the pixel electrodes of the respective pixel electrode sets. At least one has a different shape.

The pixel electrode sets may be arranged in a row and column direction in the same shape.

The area of each pixel electrode of the pixel electrode set may be the same.

The pixel electrode set may be aligned left or right.

The area of the second subpixel electrode may be 1.1 to 3 times the area of the first subpixel electrode.

Voltages of the first subpixel electrode and the second subpixel electrode may be different from each other.

DETAILED DESCRIPTION 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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with 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. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

First, a liquid crystal display according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG.

1 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram of two subpixels of the liquid crystal display according to an exemplary embodiment of the present invention.

1, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel assembly 300, a gate driver 400 connected to the liquid crystal panel assembly 300, a data driver 500, a data driver A gradation voltage generator 800 connected to the gradation voltage generator 500, and a signal controller 600 for controlling the gradation voltage generator 800 and the gradation voltage generator 800.

The liquid crystal panel assembly 300 includes a plurality of signal lines (not shown) and a plurality of pixels PX connected to the plurality of signal lines (not shown) and arranged in a substantially matrix form when viewed in an equivalent circuit. 2, the liquid crystal display panel assembly 300 includes lower and upper display panels 100 and 200 facing each other and a liquid crystal layer 3 interposed therebetween.

The signal line includes a plurality of gate lines (not shown) that transmit gate signals (also referred to as "scan signals") and a plurality of data lines (not shown) that transmit data signals. The gate lines extend substantially in the row direction and are substantially parallel to each other, and the data lines extend substantially in the column direction and are substantially parallel to each other.

Each pixel PX includes a pair of subpixels, and each subpixel includes liquid crystal capacitors Clca and Clcb. At least one of the two subpixels includes a switching element (not shown) connected to the gate line, the data line, and the liquid crystal capacitors Clca and Clcb.

The liquid crystal capacitor Clca / Clcb has two terminals of the subpixel electrode PEa / PEb of the lower panel 100 and the common electrode CE of the upper panel 200, and the subpixel electrodes PEa / PEb and the common electrode. The liquid crystal layer 3 between (CE) functions as a dielectric. The pair of subpixel electrodes PEa and PEb are separated from each other and form one pixel electrode PE. The common electrode CE is formed on the front surface of the upper panel 200 and receives the common voltage Vcom. The liquid crystal layer 3 may have a negative dielectric anisotropy and the liquid crystal molecules of the liquid crystal layer 3 may be oriented so that their long axes are perpendicular to the surface of the two display plates in the absence of an electric field.

On the other hand, in order to implement color display, each pixel PX uniquely displays one of primary colors (space division), or each pixel PX alternately displays a basic color (time division) So that the desired color is recognized by the spatial and temporal sum of these basic colors. Examples of basic colors include red, green, and blue. 2 shows that each pixel PX has a color filter CF indicating one of the basic colors in an area of the upper panel 200 as an example of space division. Unlike FIG. 2, the color filter CF may be formed above or below the subpixel electrodes PEa and PEb of the lower panel 100.

Polarizers (not shown) are provided on the outer surfaces of the display panels 100 and 200, and polarization axes of the two polarizers may be orthogonal to each other. In the case of the reflection type liquid crystal display device, one of the two polarizers 12 and 22 may be omitted. In case of an orthogonal polarizer, incident light entering the liquid crystal layer 3 without an electric field is blocked.

Referring back to FIG. 1, the gray voltage generator 800 generates a plurality of gray voltages (or reference gray voltages) related to the transmittance of the pixel PX.

The gate driver 400 is connected to the gate line of the liquid crystal panel assembly 300 to apply a gate signal Vg formed by a combination of the gate on voltage Von and the gate off voltage Voff to the gate line.

The data driver 500 is connected to a data line of the liquid crystal panel assembly 300 and selects a gray scale voltage from the gray voltage generator 800 and applies it to the data line as a data signal. However, when the gradation voltage generator 800 provides only a predetermined number of reference gradation voltages instead of providing all the voltages for all gradations, the data driver 500 divides the reference gradation voltage and supplies the gradation voltage And selects a data signal among them.

The signal controller 600 controls the gate driver 400, the data driver 500, and the like.

Each of the driving devices 400, 500, 600, and 800 may be mounted directly on the liquid crystal panel assembly 300 in the form of at least one integrated circuit chip, or may be a flexible printed circuit film (not shown). It may be mounted on the liquid crystal panel assembly 300 in the form of a tape carrier package (TCP) or mounted on a separate printed circuit board (not shown). Alternatively, these driving devices 400, 500, 600, and 800 may be integrated in the liquid crystal panel assembly 300. In addition, the drivers 400, 500, 600, 800 may be integrated into a single chip, in which case at least one of them, or at least one circuit element constituting them, may be outside of a single chip.

Next, the structure of the liquid crystal panel assembly will be described in detail with reference to FIGS. 3 to 12 and FIGS. 1 and 2 described above.

3 is an equivalent circuit diagram of one pixel of a liquid crystal panel assembly according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the liquid crystal panel assembly according to the present exemplary embodiment includes a signal line including a plurality of pairs of gate lines GLa and GLb, a plurality of data lines DL, and a plurality of storage electrode lines SL, and a plurality of connected signal lines. The pixel PX is included.

Each pixel PX includes a pair of subpixels PXa and PXb, and each subpixel PXa / PXb is a switching element connected to a corresponding gate line GLa / GLb and a data line DL, respectively. Qa / Qb, a liquid crystal capacitor Clca / Clcb connected thereto, and a storage capacitor Csta / Cstb connected to the switching element Qa / Qb and the storage electrode line SL.

Each switching element Qa / Qb is a three-terminal element, such as a thin film transistor, provided in the lower panel 100, and its control terminal is a gate line GLa / GLb. ), The input terminal is connected to the data line DL, and the output terminal is connected to the liquid crystal capacitor Clca / Clcb and the storage capacitor Csta / Cstb.

The storage capacitor Csta / Cstb, which serves as an auxiliary role of the liquid crystal capacitor Clca / Clcb, is formed by overlapping the storage electrode line SL and the pixel electrode PE provided in the lower panel 100 with an insulator interposed therebetween. A predetermined voltage such as the common voltage Vcom is applied to the storage electrode line SL. However, the storage capacitors Csta and Cstb may be formed such that the subpixel electrodes PEa and PEb overlap the front gate line directly above the insulator.

Since the liquid crystal capacitors Clca and Clcb have been described above, detailed descriptions thereof will be omitted.

In the liquid crystal display including the liquid crystal panel assembly, the signal controller 600 receives the input image signals R, G, and B for one pixel PX and outputs the two subpixels PXa and PXb. The image signal DAT may be converted and transmitted to the data driver 500. Alternatively, the gray voltage generator 800 separately sets the gray voltage sets for the two subpixels PXa and PXb and alternately provides them to the data driver 500, or alternately selects them in the data driver 500. Different voltages may be applied to the subpixels PXa and PXb. In this case, however, it is preferable to correct the image signal or to generate a set of gray voltages so that the synthesized gamma curves of the two subpixels PXa and PXb are close to the reference gamma curve at the front. For example, the composite gamma curve at the front side should match the reference gamma curve at the front side determined to be most suitable for this liquid crystal panel assembly, and the composite gamma curve at the side will be closest to the reference gamma curve at the front side.

Next, an example of the liquid crystal panel assembly illustrated in FIG. 3 will be described in detail with reference to FIGS. 4 to 8C and FIGS. 1 and 2 described above.

4 is a layout view of a lower panel of the liquid crystal panel assembly according to an exemplary embodiment of the present invention, FIG. 5 is a layout view of an upper panel of the liquid crystal panel assembly according to an exemplary embodiment of the present invention, and FIG. 6 is a lower panel of FIG. 4. And a top view of the liquid crystal panel assembly including the upper panel of FIG. 5, and FIG. 7 is a cross-sectional view of the liquid crystal panel assembly of FIG. 6 taken along the line VII-VII, and FIGS. 8A to 8C are FIGS. 4 to 7. It is a top view of the electrode piece used as the basis of the illustrated subpixel electrode.

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

First, the lower panel 100 will be described with reference to FIGS. 4 and 6 to 8C.

A plurality of pairs of first and second gate lines 121a and 121b and a plurality of storage electrode lines 131 on an insulating substrate 110 made of transparent glass or plastic. A gate conductor is formed.

The first and second gate lines 121a and 121b transmit gate signals and extend mainly in the horizontal direction, and are positioned above and below, respectively.

The first gate line 121a includes a plurality of first gate electrodes 124a protruding downward and a wide end portion 129a for connection with another layer or the gate driver 400. The second gate line 121b includes a plurality of second gate electrodes 124b protruding upward and a wide end portion 129b for connection with another layer or the gate driver 400. When the gate driver 400 is integrated on the substrate 110, the gate lines 121a and 121b may extend to be directly connected to the gate driver 400.

The storage electrode line 131 receives a predetermined voltage such as the common voltage Vcom, and mainly extends in the horizontal direction. Each storage electrode line 131 is positioned between the first gate line 121a and the second gate line 121b, and is closer to the first gate line 121a than the second gate line 121b. Each storage electrode line 131 includes a storage electrode 137 extending up and down. However, the shape and arrangement of the storage electrode line 131 including the storage electrode 137 may be modified in various forms.

The gate conductors 121a, 121b, and 131 may be formed of aluminum-based metals such as aluminum (Al) or aluminum alloys, silver-based metals such as silver (Ag) or silver alloys, copper-based metals such as copper (Cu) or copper alloys, and molybdenum (Mo). ) And molybdenum-based metals such as molybdenum alloys, chromium (Cr), tantalum (Ta) and titanium (Ti). However, they may have a multi-film structure including two conductive films (not shown) having different physical properties. One of the conductive films is made of a metal having a low resistivity, for example, an aluminum-based metal, a silver-based metal, or a copper-based metal to reduce signal delay and voltage drop. On the other hand, other conductive films are made of other materials, especially 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, tantalum, and titanium. A good example of such a combination is a chromium bottom film, an aluminum (alloy) top film, an aluminum (alloy) bottom film and a molybdenum (alloy) top film. However, the gate conductors 121a, 121b, and 131 may be made of various other metals or conductors.

Side surfaces of the gate conductors 121a, 121b, and 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 conductors 121a, 121b, and 131.

On the gate insulating layer 140, a plurality of first and second island-like semiconductors 154a and 154b made of hydrogenated amorphous silicon (amorphous silicon is abbreviated a-Si), polycrystalline silicon, or the like are formed. It is. The first and second semiconductors 154a and 154b are positioned on the first and second gate electrodes 124a and 124b, respectively.

A pair of island-like ohmic contacts (not shown) are formed on each of the first semiconductors 154a, and a pair of island-like ohmic contacts 163b and 165b are formed on each of the second semiconductors 154b. ) Is formed. The ohmic contacts 163b and 165b 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.

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

Data including a plurality of data lines 171 and a plurality of pairs of first and second drain electrodes 175a and 175b on the ohmic contacts 163b and 165b and the gate insulating layer 140. A conductor is formed.

The data line 171 transmits a data signal and mainly extends in the vertical direction to cross the gate lines 121a and 121b and the storage electrode line 131. Each data line 171 may have a different layer or data driver 500 than the plurality of pairs of first and second source electrodes 173a and 173b extending toward the first and second gate electrodes 124a and 124b, respectively. It includes a wide end portion 179 for the connection with the). When the data driver 500 is integrated on the substrate 110, the data line 171 may be extended and directly connected thereto.

The first and second drain electrodes 175a and 175b are separated from each other and also separated from the data line 171. The first and second drain electrodes 175a and 175b face the first and second source electrodes 173a and 173b with respect to the first and second gate electrodes 124a and 124b, and have one wide end portion ( 177a / 177b) and the other end that is rod-shaped. The wide end portion 177b of the second drain electrode 175b has a larger area than the wide end portion 177a of the first drain electrode 175a. The wide ends 177a and 177b overlap the sustain electrode 137, and the rod-shaped ends are partially surrounded by the bent first and second source electrodes 173a and 173b.

The first and second gate electrodes 124a and 124b, the first and second source electrodes 173a and 173b, and the first and second drain electrodes 175a and 175b are formed of the first and second semiconductors 154a and 154b. Together with the first and second thin film transistors TFTs (Qa / Qb), the channels of the first and second thin film transistors (Qa / Qb) are first and second sources. The first and second semiconductors 154a and 154b are formed between the electrodes 173a and 173b and the first and second drain electrodes 175a and 175b. The first and second thin film transistors Qa and Qb are positioned on the left and right sides of the data line 171, respectively.

The data conductors 171, 175a, and 175b 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 multi-layer structure (not shown). Examples of the multilayer structure include a double film of a chromium or molybdenum (alloy) lower film and an aluminum (alloy) upper film, a molybdenum (alloy) lower film, an aluminum (alloy) intermediate film and a molybdenum (alloy) upper film. However, the data conductors 171, 175a, and 175b may be made of various other metals or conductors.

The data conductors 171, 175a, and 175b also preferably have their side surfaces inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

The ohmic contacts 163b and 165b exist only between the semiconductors 154a and 154b below and the data conductors 171, 175a and 175b above and lower the contact resistance therebetween. The semiconductors 154a and 154b have portions exposed between the source electrodes 173a and 173b and the drain electrodes 175a and 175b and not covered by the data conductors 171, 175a and 175b.

A passivation layer 180 is formed on the data conductors 171, 175a, and 175b and the exposed semiconductors 154a and 154b. The protective film 180 is made of an inorganic insulating material or an organic insulating material and may have a flat surface. The organic insulator preferably has a dielectric constant of 4.0 or less, and may have photosensitivity. 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 portions of the semiconductors 154a and 154b while maintaining excellent insulating properties of the organic layer.

The passivation layer 180 includes a plurality of contact holes that expose the end portions 179 of the data lines 171 and the wide end portions 177a and 177b of the first and second drain electrodes 175a and 175b, respectively. 182, 185a, and 185b are formed, and the plurality of contact holes 181a and 181b exposing the end portions 129a and 129b of the gate lines 121a and 121b, respectively, in the passivation layer 180 and the gate insulating layer 140. Formed.

A plurality of pixel electrodes 191R, 191G, and 191B and a plurality of contact assistants 81a, 81b, and 82 are formed on the passivation layer 180. They may be made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

The pixel electrodes 191R, 191G, and 191B are formed on the upper panel 200, respectively, and have color filters CF representing one of three primary colors of primary colors, for example, red (R), green (G), and blue (B). Facing each other). Each pixel electrode 191R, 191G, and 191B includes a pair of first and second subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb, which are separated from each other, and the subpixel electrodes 191Ra, 191Rb. , 191Ga, 191Ba, and 191Bb have cutouts 91a and 91b, and the subpixel electrode 191Gb has a cutout 92. In addition, the common electrode 270 facing the pixel electrode 191 has a plurality of cutouts 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, and 71Bb2.

Each of the first and second subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb each includes at least one parallelogram electrode piece 196 shown in FIG. 8A and a parallelogram electrode piece shown in FIG. 8B. 197) one. When the electrode pieces 196 and 197 shown in FIGS. 8A and 8B are connected up and down, the basic electrodes 198 shown in FIG. 8C become subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb. Has a structure based on the basic electrode 198.

As shown in FIGS. 8A and 8B, each of the electrode pieces 196 and 197 has a pair of oblique edges 196o and 197o and a pair of transverse edges 196t and 197t and is approximately Parallelogram. Each of the oblique sides 196o and 197o forms an oblique angle with respect to the horizontal sides 196t and 197t, and the size of the oblique angle is preferably about 45 degrees to 135 degrees. For convenience, it is divided according to the inclined direction ("inclination direction") in a vertical state with respect to the bases 196t and 197t forward, and the case inclined to the right as shown in FIG. 8A is called "right inclination" and left as shown in FIG. 8B. The case of tilting is called "left slope".

The lengths of the horizontal sides 196t and 197t of the electrode pieces 196 and 197, that is, the distance between the width W and the horizontal sides 196t and 197t, that is, the height H may be freely determined according to the size of the display panel assembly 300. Can be. In addition, the horizontal edges 196t and 197t of each of the electrode pieces 196 and 197 may be deformed or bent in consideration of a relationship with other portions, and will be referred to as a parallelogram in the future.

The common electrodes 270 are formed with cutouts 61 and 62 facing the electrode pieces 196 and 197, and the electrode pieces 196 and 197 have two subregions (centered around the cutouts 61 and 62). S1, S2). The incisions 61 and 62 form obtuse angles with the oblique portions 61o and 62o and the oblique portions 61o and 62o parallel to the hypotenuses 196o and 197o of the electrode pieces 196 and 197, respectively. And horizontal portions 61t and 62t overlapping the horizontal sides 196t and 197t of.

Each of the subregions S1 and S2 has two primary edges defined by the oblique portions 61o and 62o of the incisions 61 and 62 and the hypotenuses 196t and 197t of the electrode pieces 196 and 197. ) The distance between the periphery, i.e. the width of the subregion, is preferably about 25-40 mu m.

The basic electrode 198 illustrated in FIG. 8C is formed by combining the right inclined electrode piece 196 and the left inclined electrode piece 197. The angle formed by the right inclined electrode piece 196 and the left inclined electrode piece 197 is preferably approximately right angle, and the connection between the two electrode pieces 196 and 197 is made only in part. The unconnected portion forms the incision 90 and is located on the recessed side. However, the cutout 90 may be omitted.

The outer horizontal sides 196t and 197 of the two electrode pieces 196 and 197 form a horizontal side 198t of the basic electrode 198, and the corresponding hypotenuse sides 196o and 197o of the two electrode pieces 196 are connected to each other. Curved edges 198o1 and 198o2 of the basic electrode 198 are formed.

Curved edges 198o1 and 198o2 meet convex edges 198o1 and transverse sides 198t and obtuse angles such as about 135 ° and acute angles, for example about 45 °. And a concave edge 198o2. The curved sides 198o1 and 198o2 are formed by a pair of hypotenuse sides 196o and 197o at approximately right angles, and thus the angle of bending is approximately right angles.

The cutout 60 extends from the concave vertex CV on the concave side 198o2 to the center of the base electrode 198 toward the convex vertex VV on the convex side 198o1.

In addition, the cutouts 61 and 62 of the common electrode 270 are connected to each other to form one cutout 60. At this time, the horizontal portions 61t and 62t overlapped by the cutouts 61 and 62 are combined to form one horizontal portion 60t1. This new form of incision 60 can be described again as follows.

The cutout 60 is connected to both ends of the bent part 60o having the bend point CP, the central horizontal portion 60t1 connected to the bend point CP of the bent part 60o, and the bent part 60o. And a pair of terminal cross sections 60t2. The bent portion 60o of the incision 60 consists of a pair of oblique portions that meet at right angles, and is substantially parallel to the bend sides 198o1 and 198o2 of the base electrode 198, and the base electrode 198 is left-right and right-sided. Divide into wealth The central horizontal portion 60t1 of the incision 60 forms an obtuse angle, for example about 135 °, with the bend 60o and extends toward the convex vertex VV of the basic electrode 198. The terminal horizontal portion 60t2 is aligned with the horizontal side 198t of the base electrode 198 and forms an obtuse angle with the bend portion 60o, for example, about 135 °.

The base electrode 198 and the incision 60 are approximately inverted symmetric with respect to an imaginary straight line (referred to as a "horizontal center line" forward) connecting the convex vertex (VV) and the concave vertex (CV) of the base electrode 198.

As shown in FIGS. 4 to 6, the first subpixel electrodes 191Ra, 191Ga, and 191Ba are formed of the left inclined electrode piece 197 and the right inclined electrode piece 196, and the basic electrode shown in FIG. 198) has substantially the same structure.

The second subpixel electrodes 191Rb and 191Bb include first and second unit electrodes 191Rb1, 191Rb2, 191Bb1, and 191Bb2 having substantially the same structure as the base electrode 198, and the first and second unit electrodes. The 191Rb1, 191Rb2, 191Bb1, and 191Bb2 are connected up and down by the connecting portions 192R and 192B. The heights of the first unit electrodes 191Rb1 and 191Bb1 are higher than the heights of the second unit electrodes 191Rb2 and 191Bb2 and are preferably about 1.1 to 2 times higher. In addition, when the heights of the first subpixel electrodes 191Ra and 191Ba are the same as the heights of the first unit electrodes 191Rb1 and 191Bb1, the first subpixel electrodes 191Ra and 191Ba and the second subpixel electrodes 191Rb and 191Bb may be formed. The area ratio is approximately 1: 1.5 to 1: 2. By adjusting the width and height of the first subpixel electrodes 191Ra and 191Ba and the first and second unit electrodes 191Rb1, 191Rb2, 191Bb1, and 191Bb2 of the second subpixel electrode, a desired area ratio may be obtained. It is desirable to have an area ratio of 1: 1.1 to 1: 3.

The second subpixel electrode 191RG has three structures substantially the same as the base electrode 198 and includes three unit electrodes connected from the bottom and the top. The two cutouts 92 divide the second subpixel electrode 191Gb into three parts and each include a bent portion parallel to a curved side of the second subpixel electrode 191Gb and a horizontal portion connected thereto. The width of the second subpixel electrode 191Gb is wider than the width of the first subpixel electrode 191Ga, for example, approximately three times. In addition, the height of the second subpixel electrode 191Gb may be about 1/2 to 1 times the height of the first subpixel electrode 191Ga. Similarly, the area ratio can be adjusted by adjusting the width and height of the first and second subpixel electrodes 191Ga and 191Gb, and preferably have an area ratio of about 1: 1.1 to about 1: 3.

The widths and heights of the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb may be adjusted to substantially equal the areas of the pixel electrodes 191R, 191G, and 191B.

In this way, when the pixel electrodes 191R, 191G, and 191B representing the three primary colors form one pixel electrode set, the pixel electrodes 191R, 191G, and 191B representing the same color of the neighboring pixel electrode sets are formed. The shape is repeated the same, and the shape of the neighboring pixel electrode set itself is also repeated. Accordingly, the vertical line expression is better and it is easy to apply a data voltage to the first and second subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb separately.

In addition, since the width and height of the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb can be easily adjusted in one pixel electrode set, the area between each pixel electrode 191R, 191G, and 191B can be easily adjusted.

An aperture ratio and a transmittance may be increased in a display device having a large pixel size, for example, a 32-inch or larger medium-large display device.

The first subpixel electrodes 191Ra, 191Ga, and 191Ba are connected to the respective first drain electrodes 175a through the contact holes 185a, respectively, and the second subpixel electrode 191Gb and the second subpixel electrode ( The connecting portions 192R and 192B of the 191Rb and the 191Bb are connected to the respective second drain electrodes 175b through the contact holes 185b, respectively.

The wide end portions 177a and 177b and the contact holes 185a and 185b of the storage electrode line 131, the first and second drain electrodes 175a and 175b are formed of the first subpixel electrodes 191Ra, 191Ga, and 191Ba. The two subpixel electrodes 191Rb and 191Bb are positioned near the boundary with the second unit electrodes 191Rb2 and 191Bb2 or the second subpixel electrode 191Gb. In this vicinity, the arrangement of the liquid crystal molecules may be disturbed, resulting in texture. When arranged in this way, the aperture ratio may be improved while covering up the texture. Also, the second gate line 121b may also have a second unit electrode 191Rb2, 191Bb2 or a second subpixel electrode 191Gb of the first subpixel electrodes 191Ra, 191Ga, and 191Ba and the second subpixel electrodes 191Rb and 191Bb. It is located near the border with).

The first / second subpixel electrodes 191Ra, 191Ga, and 191Ba) / (191Rb, 191Gb, and 191Bb) and the common electrode 270 of the upper panel 200 are each of the first and second liquid crystal layers 3 therebetween. The second liquid crystal capacitor Clca / Clcb is formed to maintain the applied voltage even after the thin film transistors Qa / Qb are turned off.

The first subpixel electrodes 191Ra, 191Ga, and 191Ba and the first drain electrode 175a connected thereto overlap the first and second storage capacitors Csta with the gate insulating layer 140 interposed therebetween. / Cstb, and the first / second storage capacitors Csta / Cstb enhance the voltage holding capability of the first / second liquid crystal capacitors Clca / Clcb.

The contact auxiliary members 81a, 81b, and 82 are end portions 129a and 129b of the gate lines 121a and 121b and end portions 179 of the data line 171 through the contact holes 181a, 181b, and 182, respectively. Connected with The contact auxiliary members 81a, 81b, and 82 complement and protect the adhesion between the end portions 129a and 129b of the gate lines 121a and 121b and the end portions 179 of the data line 171 and the external device. do.

Next, the upper panel 200 will be described with reference to FIGS. 5 to 8.

A light blocking member 220 is formed on an insulating substrate 210 made of transparent glass or plastic. The light blocking member 220 includes a bent portion corresponding to the curved side of the pixel electrodes 191R, 191G, and 191B and a quadrangle portion corresponding to the thin film transistor, and prevents light leakage between the pixel electrodes 191R, 191G, and 191B, and prevents the pixel electrode. An opening region facing 191R, 191G, 191B is defined.

A plurality of color filters 230R and 230G are further formed on the substrate 210 and the light blocking member 220. The color filters 230R and 230G are mostly present in an area surrounded by the light blocking member 230, and may extend long along the columns of the pixel electrodes 191R, 191G, and 191B. The color filter 230R displays red (R), the color filter 230G displays green (G), and includes a color filter 230 (not shown) that represents blue (B). The color filter may display one of the primary colors other than the three primary colors of red, green, and blue.

An overcoat 250 is formed on the color filters 230R and 230G and the light blocking member 220. The cover film 250 can be made of (organic) insulation and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat 250 may be omitted.

A common electrode 270 is formed on the lid 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO, and has a plurality of cutouts 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2.

Since the shapes of the cutouts 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2 of the common electrode 270 are as described above, detailed descriptions thereof will be omitted.

The number of cutouts 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2 may vary depending on the design element, and the light shielding member 220 may have cutouts 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, 71Ba. , 71Bb1, 71Bb2), and can block light leakage near the cutouts 71Ra, 71Rb1. 71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2.

Alignment layers 11 and 21 are formed 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 the polarization axes of the two polarizers 12 and 22 are orthogonal to each other and the curved sides of the subpixel electrodes 191a and 191b are approximately equal to each other. It is desirable to achieve an angle of 45 degrees. In the case of the reflection type liquid crystal display device, one of the two polarizers 12 and 22 may be omitted.

The liquid crystal display may 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 of the liquid crystal layer 3 are aligned such that their major axes are perpendicular to the surfaces of the two display panels in the absence of an electric field.

The cutouts 71Ra, 71Rb1. 71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2 may be replaced by protrusions (not shown) or depressions (not shown). The protrusions may be made of organic or inorganic materials and may be disposed above or below the field generating electrodes 191R, 191G, 191B, and 270.

The operation of the liquid crystal display device will now be described in detail.

The signal controller 600 receives an input control signal for controlling the display of the input image signals R, G, and B from an external graphic controller (not shown). The input image signals R, G, and B contain luminance information of each pixel PX, and the luminance is a predetermined number, for example, 1024 (= 2 ¹⁰ ), 256 (= 2 ⁸ ), or 64 (= 2 ⁶ ) It has gray. Examples of the input control signal include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a main clock MCLK, and a data enable signal DE.

The signal controller 600 applies the input image signals R, G, and B to the operating conditions of the liquid crystal panel assembly 300 and the data driver 500 based on the input image signals R, G, and B and the input control signal. After appropriately processing and generating the gate control signal CONT1 and the data control signal CONT2, the gate control signal CONT1 is sent to the gate driver 400, and the data control signal CONT2 and the processed image signal DAT are processed. ) Is output to the data driver 500. The output video signal DAT has a predetermined number of values (or gradations) as a digital signal.

The gate control signal CONT1 includes at least one clock signal for controlling the output period of the scan start signal STV indicating the start of scanning and the gate-on voltage Von. The gate control signal CONT1 may further include an output enable signal OE that defines the duration of the gate on voltage Von.

The data control signal CONT2 includes a horizontal synchronization start signal STH indicating the start of transmission of image data to a group of subpixels, a load signal LOAD and a data clock signal for applying a data signal to the liquid crystal panel assembly 300. (HCLK). The data control signal CONT2 is also an inverted signal that inverts the voltage polarity of the data signal relative to the common voltage Vcom (hereinafter referred to as " polarity of the data signal " RVS) may be further included.

In response to the data control signal CONT2 from the signal controller 600, the data driver 500 receives the digital image signal DAT for a group of subpixels, and the gray level corresponding to each digital image signal DAT. By selecting the voltage, the digital image signal DAT is converted into an analog data signal and then applied to the corresponding data line 171.

The gate driver 400 applies the gate-on voltage Von to the gate lines 121a and 121b according to the gate control signal CONT1 from the signal controller 600 to connect the switching elements connected to the gate lines 121a and 121b. Turn on (Qa, Qb). Then, the data signal applied to the data line 171 is applied to the corresponding subpixels 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb through the turned-on switching elements Qa and Qb.

When a potential difference occurs between both ends of the first or second liquid crystal capacitors Clca and Clcb, a primary electric field substantially perpendicular to the surfaces of the display panels 100 and 200 is generated in the liquid crystal layer 3. . [In the following, the pixel electrodes 191R, 191G, and 191B and the common electrode 270 are also referred to as "field generating electrodes.") The liquid crystal molecules of the liquid crystal layer 3 have their long axes in response to the electric field. It is inclined to be perpendicular to the direction of the electric field, and the degree of change in polarization of incident light in the liquid crystal layer 3 varies according to the degree of inclination of the liquid crystal molecules. This change in polarization is represented by a change in transmittance by the polarizer, through which the liquid crystal display displays an image.

The angle at which the liquid crystal molecules are inclined depends on the intensity of the electric field. Since the voltages of the two liquid crystal capacitors Clca and Clcb are different from each other, the angles at which the liquid crystal molecules are inclined are different and thus the luminance of the two subpixels is different. Therefore, if the voltage of the first liquid crystal capacitor Clca and the voltage of the second liquid crystal capacitor Clcb are properly adjusted, the image viewed from the side may be as close as possible to the image viewed from the front, that is, the side gamma curve may be front gamma curve. As close as possible to this, side visibility can be improved.

In addition, when the area of the first subpixel electrodes 191Ra, 191Ga, and 191Ba to which a high voltage is applied is smaller than the area of the second subpixel electrodes 191Rb, 191Gb, and 191Bb, the side gamma curve may be closer to the front gamma curve. have. In particular, since the area ratio of the first subpixel electrodes 191Ra, 191Ga, and 191Ba and the second subpixel electrodes 191Rb, 191Gb, and 191Bb is approximately 1: 2, the side gamma curve becomes closer to the front gamma curve, so that side visibility is better. Lose. In particular, in the present invention, since the width and height of the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb are freely adjusted in one pixel electrode set, the first subpixel electrodes 191Ra, 191Ga, 191Ba, and the second subunit are free. The area ratio control of the pixel electrodes 191Rb, 191Gb, and 191Bb is also free and easy to adjust to 1: 2.

The direction in which the liquid crystal molecules are inclined is primarily the incisions 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2, 91a, 91b, 92 and subpixels of the field generating electrodes 191R, 191G, 191B, and 270. The sides of the electrodes 191Ra, 191Ga, 191Ba, 191Rb, 191Gb, and 191Bb are determined by the horizontal component produced by distorting the main electric field. The horizontal components of the main electric field are the sides of the cutouts 71Ra, 71Rb1, 71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2, 91a, 91b, 92 and the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, 191Bb. Is almost perpendicular to the sides.

The subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb are divided into four sub-areas by the incisions 71Ra, 71Rb1, 71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, and 71Bb2. Each subregion is defined by the bent portions of the cutouts 71Ra, 71Rb1, 71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2 and the bent sides of the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb. Has major edges. Most of the liquid crystal molecules on each subregion are inclined in a direction perpendicular to the periphery thereof, and thus, the inclination directions are approximately four directions. When the direction in which the liquid crystal molecules are tilted is varied in this way, the reference viewing angle of the liquid crystal display device is increased.

On the other hand, the direction of the secondary electric field generated by the voltage difference between the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, 191Bb is perpendicular to the periphery of the subregion. Thus, the direction of the negative electric field coincides with the direction of the horizontal component of the main electric field. As a result, the negative electric field between the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb acts to strengthen the crystal in the oblique direction of the liquid crystal molecules.

This process is repeated in units of one horizontal period (also referred to as "1H" and equal to one period of the horizontal sync signal Hsync and the data enable signal DE), thereby allocating data signals to all the pixels PX. Is applied to display an image of one frame.

At the end of one frame, the next frame starts and the state of the inversion signal RVS applied to the data driver 500 is controlled such that the polarity of the data signal applied to each pixel PX is opposite to the polarity of the previous frame ( "Frame inversion"). In this case, the polarities of the data signals flowing through one data line are changed (eg, row inversion and point inversion) according to the characteristics of the inversion signal RVS within one frame, or the polarities of the data signals applied to a group of pixels are also different from each other. Can be different (eg invert columns, invert points).

Next, another example of the liquid crystal panel assembly illustrated in FIG. 3 will be described in detail with reference to FIGS. 9 to 12, and FIGS. 1 and 2 described above.

9 is a layout view of a lower panel of the liquid crystal panel assembly according to another exemplary embodiment of the present invention, FIG. 10 is a layout view of an upper panel of the liquid crystal panel assembly according to another exemplary embodiment of the present invention, and FIG. 11 is a lower panel of FIG. 9. 10 is a layout view of the liquid crystal panel assembly including the upper panel of FIG. 10, and FIG. 12 is a cross-sectional view of the liquid crystal panel assembly of FIG. 11 taken along the line XII-XII.

9 to 12, the liquid crystal panel assembly according to the present exemplary embodiment includes a lower panel 100, an upper panel 200, and a liquid crystal layer 3 therebetween.

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. 4 to 7.

Referring to the lower panel 100, a plurality of pairs of first and second gate lines 121a and 121b and a plurality of pairs of first and second storage electrode lines 131a and 131b are disposed on the insulating substrate 110. A gate conductor is formed. The first and second gate lines 121a and 121b include first and second gate electrodes 124a and 124b and end portions 129a and 129b, respectively, and the first and second storage electrode lines 131a and 131b. Includes first and second sustain electrodes 137a and 137b, respectively. The second storage electrode line 131b further includes a third storage electrode 136b. The gate insulating layer 140 is formed on the gate conductors 121a, 121b, 131a, and 131b. A plurality of semiconductors 154a and 154b are formed on the gate insulating layer 140, and a plurality of ohmic contacts 163a and 165a are formed thereon. A data conductor including a plurality of data lines 171 and a plurality of first and second drain electrodes 175a and 175b is formed on the ohmic contacts 163a and 165a. The data line 171 includes a plurality of first and second source electrodes 173a and 173b and end portions 179, and the drain electrodes 175a and 175b have wide end portions 177a and 177b and protrusions 176a. ) And extension 176b. The passivation layer 180 is formed on the data conductors 171, 175a and 175b and the exposed portions of the semiconductors 154a and 154b. The passivation layer 180 and the gate insulating layer 140 have a plurality of contact holes 181a, 181b, 182, 185a, and 185b are formed. On the passivation layer 180, a plurality of pixel electrodes 191R, 191G, and 191B including the first and second subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb, and a plurality of contact auxiliary members 81a and 81b. , 82 are formed, and cutouts 91a, 91b, 92 are formed in the first and second subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb, respectively. An alignment layer 11 is formed on the pixel electrodes 191R, 191G, and 191B, the contact auxiliary members 81a, 81b, and 82, and the passivation layer 180.

Referring to the upper panel 200, the light blocking member 220, the plurality of color filters 230R, the overcoat 250, and the cutouts 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, and 71Ba are disposed on the insulating substrate 210. , The common electrode 270 having 71Bb1 and 71Bb2, and the alignment layer 21 are formed.

However, unlike the liquid crystal panel assembly illustrated in FIGS. 4 to 7, the first gate line 121a may include the first subpixel electrode 191Ra, 191Ga, and 191Ba, the second subpixel electrode 191G, or the second subpixel electrode. It is located near the boundary with the 2nd unit electrodes 191Rb2 and 191Bb2 of (191Rb and 191Bb).

In addition, the first storage electrode line 131a, the extended portion 177a of the first drain electrode 175a, and the contact hole 185a may have the first subpixel electrode 191Ra, 191Ga, 191Ba, or the second subpixel electrode 191Rb, It is positioned on a straight line connecting the bending points of the first unit electrodes 191Rb1 and 191Bb1 of 191Bb. The second storage electrode line 131b, the extension portion 177b of the second drain electrode 175b, and the contact hole 185b may be the first unit electrodes 191Rb1, 191Bb1 or the first sub-electrode 191Rb, 191Bb of the second subpixel electrode 191Rb, 191Bb. It is positioned on a straight line connecting the bending points of the two subpixel electrodes 191Gb. In the straight line connecting the bending points of the subpixel electrodes 191Ra, 191Rb, 191Ga, 191Gb, 191Ba, and 191Bb, the arrangement of the liquid crystal molecules is disturbed, so that textures are likely to appear, so the aperture ratio can be improved while covering the texture. . Further, since the first and second holding capacitors Csta and Cstb and the contact holes 185a and 185b are formed under the cutouts 71Ra, 71Rb2, 71Ga, 71Gb, 71Ba, and 71Bb2, the cutouts 71Ra, 71Rb2, 71Ga are formed. , 71Gb, 71Ba, 71Bb2).

The first drain electrode 175a includes a protrusion 176a that extends and extends along the first storage electrode line 131a in the extension portion 177a. The second drain electrode 175b connected to the second subpixel electrode 191Bb further includes an extension 176b connected to the extension 177b and overlapping the third storage electrode 136b.

In this way, the area where the sustain electrodes 137a, 137b, and 136b and the drain electrodes 175a and 175b overlap can be freely adjusted, and the capacity of the storage capacitors Csta and Cstb can be freely adjusted.

In addition, since the first and second thin film transistors Qa and Qb are both positioned to the right of the data line 171, defects due to deviations in the manufacturing process may be reduced. In addition, the distance between the data lines 171 can be freely adjusted, and the area where the data lines 171 and the pixel electrodes 191R, 191G, and 191B overlap can be easily adjusted, so that the data lines 171 and the pixel electrodes 191R, 191G, The capacitance of the parasitic capacitor made by 191B) can be adjusted.

At the oblique portions of the cutouts 71Ra, 71Rb1.71Rb2, 71Ga, 71Gb, 71Ba, 71Bb1, 71Bb2 of the common electrode 270, there is at least one notch.

In addition, unlike the liquid crystal panel assembly illustrated in FIGS. 4 to 7, in the liquid crystal panel assembly according to the present exemplary embodiment, there is no color filter and an overcoat on the upper panel 200, and a plurality of liquid crystal panels below the protective layer 180 of the lower panel 100. The color filter 230R is formed.

The color filter 230R extends vertically while periodically bending along the column of the pixel electrode 191R, and ends 129a and 129b of the gate lines 121a and 121b and ends 179 of the data line 171. It does not exist in the surrounding area where it is located. A contact hole 185a passes through the color filter 230R, and a through hole 235 larger than the contact hole 185a is formed.

The neighboring color filter 230R may have a function of a light blocking member that overlaps the data line 171 and blocks light leaking between neighboring pixel electrodes 191R, 191G, and 191B. In this case, the light blocking member of the upper panel 200 may be omitted, thereby simplifying the process.

A protective film (not shown) may be provided below the color filter 230R.

When arranged in the present embodiment, the light transmittance is increased to improve the aperture ratio and transmittance.

Many features of the liquid crystal panel assembly illustrated in FIGS. 4 to 7 may be applied to the liquid crystal panel assembly illustrated in FIGS. 9 to 12.

Next, a liquid crystal panel assembly according to another exemplary embodiment of the present invention will be described in detail with reference to FIGS. 13 to 15 and FIGS. 1 and 2 described above.

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

Referring to FIG. 13, the liquid crystal panel assembly according to the present exemplary embodiment includes a signal line including a plurality of gate lines GL, a plurality of pairs of data lines DLc and DLd, and a plurality of storage electrode lines SL, and a plurality of signal lines connected thereto. The pixel PX is included.

Each pixel PX includes a pair of subpixels PXc and PXd, and each subpixel PXc / PXd is a switching element connected to a corresponding gate line GL and a data line DLc / DLd, respectively. Qc / Qd, the liquid crystal capacitor Clcc / Clcd connected thereto, and the storage capacitor Cstc / Cstd connected to the switching element Qc / Qd and the sustain electrode line SL.

Each switching element Qc / Qd 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 the data line DLc / DLd. ), And the output terminal is connected to the liquid crystal capacitor (Clcc / Clcd) and the holding capacitor (Cstc / Cstd).

Operations of the liquid crystal display including the liquid crystal capacitors Clcc and Clcd, the storage capacitors Cstc and Cstd, and the liquid crystal panel assembly as described above are substantially the same as in the foregoing embodiment, and thus detailed description thereof will be omitted. However, in the liquid crystal display of FIGS. 3 to 12, two subpixels PXa and PXa constituting one pixel PX receive a data voltage with a parallax, whereas in the present embodiment, two subpixels PXc , PXd) receives a data voltage at the same time.

An example of the liquid crystal panel assembly illustrated in FIG. 13 will be described in detail with reference to FIGS. 14 and 15.

FIG. 14 is a layout view of a liquid crystal panel assembly according to another exemplary embodiment. FIG. 15 is a cross-sectional view of the liquid crystal panel assembly of FIG. 14 taken along the line XV-XV.

As shown in FIG. 14 and FIG. 15, the liquid crystal panel assembly according to the present exemplary embodiment includes a lower panel 100 and an upper panel 200 facing each other, a liquid crystal layer 3 and a display panel between the two panels. 100, 200) and a pair of polarizers 12, 22 attached to the outer surface.

The layer structure of the liquid crystal panel assembly according to the present embodiment is usually the same as the layer structure of the liquid crystal panel assembly shown in Figs.

Referring to the lower panel 100, a plurality of gate conductors including a plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on the insulating substrate 100. Each gate line 121 includes a plurality of pairs of first and second gate electrodes 124c and 124d and an end portion 129. The storage electrode line 131 includes a plurality of storage electrodes 137. The gate insulating layer 140 is formed on the gate conductors 121 and 131. A plurality of linear semiconductors 151 including first and second protrusions 154c and 154d are formed on the gate insulating layer 140, and a plurality of linear ohmic contacts 161 having protrusions 163c thereon. A plurality of island type ohmic contact members 165c are formed. A data conductor including a plurality of pairs of first and second data lines 171c and 171d and a plurality of first and second drain electrodes 175c and 175d is formed on the ohmic contacts 161 and 165c. The first and second data lines 171c and 171d include a plurality of first and second source electrodes 173c and 173d and end portions 179c and 179d, respectively, and the first and second drain electrodes 175c. Includes extensions 177c and 177d. A passivation layer 180 is formed on the data conductors 171c, 171d, 175c, and 175d and the exposed semiconductors 154c and 154d, and the contact layer 181 is formed in the passivation layer 180 and the gate insulating layer 140. 182c, 182d, 185c, and 185d) are formed. On the passivation layer 180, a plurality of pixel electrodes 191R, 191G, and 191B including first and second subpixel electrodes 191Rc, 191Rd, 191Gc, 191Gd, 191Bc, and 191Bd, and a plurality of contact auxiliary members 81, 82c, respectively. , 82d). The second subpixel electrode 191Rd includes the first and second unit electrodes 191Rd1 and 191Rd2, and the second subpixel electrode 191Bd includes the first and second unit electrodes 191Bd1 and 191Bd2. . Cutouts 91c and 91d are formed in the subpixel electrodes 191Rc, 191Rd, 191Gc, 191Bc, and 191Bd, and cutouts 92 are formed in the subpixel electrode 191Gd. An alignment layer 11 is formed on the pixel electrodes 191R, 191G, and 191B, the contact auxiliary members 81, 82c, and 82d, and the passivation layer 180.

Referring to the upper panel 200, the light blocking member 220, the plurality of color filters 230R, the overcoat 250, the cutouts 71Rc, 71Rd1.71Rd2, 71Gc, 71Gd, and 71Bc are disposed on the insulating substrate 210. , A common electrode 270 having 71Bd1 and 71Bd2, and an alignment layer 21 are formed.

However, in the liquid crystal panel assembly according to the present exemplary embodiment, the number of gate lines 121 is half and the number of data lines 171c and 171d is double compared with that of the liquid crystal panel assembly illustrated in FIGS. 4 to 8. The first and second thin film transistors Qc and Qd connected to the first and second subpixel electrodes 191Rc, 191Rd, 191Gc, 191Gd, 191Bc, and 191Bd forming one pixel electrode 191R, 191G, and 191B are connected to each other. It is connected to the same gate line 121 and different data lines 171c and 171d.

The first and second thin film transistors Qc and Qd are positioned on the left side of the first and second data lines 171c and 171d, respectively.

In addition, the semiconductors 154c and 154d extend along the data lines 171c and 171d and the drain electrodes 175c and 175d to form the linear semiconductor 151, and the ohmic contact 163c is along the data line 171c. Extend to form a linear ohmic contact 161. The linear semiconductor 151 has substantially the same planar shape as the data conductors 171c, 171d, 175c, and 175d and the ohmic contacts 161 and 165c thereunder.

In the method of manufacturing the thin film transistor array panel according to the exemplary embodiment of the present invention, the data lines 171c and 171d, the drain electrodes 175c and 175c, the semiconductor 151 and the ohmic contacts 161 and 165c are photographed once. Form by process.

The photosensitive film used in such a photo process differs in thickness according to a position, and especially includes a 1st part and a 2nd part in order of decreasing thickness. The first portion is positioned in the wiring region occupied by the data lines 171c and 171d and the drain electrodes 175c and 175d, and the second portion is positioned in the channel region of the thin film transistor.

There may be various methods of varying the thickness of the photoresist film according to the position. For example, a method of providing a translucent area in addition to a light transmitting area and a light blocking area in a photomask is possible. have. The translucent region is provided with a slit pattern, a lattice pattern, or a thin film having a medium transmittance or a medium thickness. When using the slit pattern, it is preferable that the width of the slits and the interval between the slits are smaller than the resolution of the exposure machine used for the photographic process. Another example is a method using a reflowable photoresist. That is, a reflowable photoresist film is formed with a normal exposure mask having only a light-transmitting region and a light-shielding region, and then reflowed to flow into a region where the photoresist film is not left, thereby forming a thin portion.

In this way, a one-time photographic process can be reduced, thereby simplifying the manufacturing method.

Many features of the liquid crystal panel assembly illustrated in FIGS. 4 to 8 may also be applied to the liquid crystal panel assembly illustrated in FIGS. 13 to 15.

Next, a liquid crystal panel assembly according to another exemplary embodiment of the present invention will be described in detail with reference to FIG. 16 and FIGS. 1 and 2 described above.

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

Referring to FIG. 16, 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 PXe and PXf and a coupling capacitor Ccp connected between the two subpixels PXe and PXf.

The first subpixel PXe includes a switching element Q connected to a corresponding gate line GL and a data line DL, a first liquid crystal capacitor Clce, and a storage capacitor Cst connected thereto. The second subpixel PXf includes a second liquid crystal capacitor Clcf 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 Clce, the holding capacitor Cste, and the coupling capacitor Ccp.

The switching element Q applies the data voltage from the data line DL to the first liquid crystal capacitor Clce 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 Clcf.

If the common voltage Vcom is applied to the storage capacitor Cste and the capacitors Clce, Cste, Clcf, and Ccp are represented by the same reference numerals, the voltage Ve charged in the first liquid crystal capacitor Clce is assumed to be the same. And the voltage Vf charged in the second liquid crystal capacitor Clcf have the following relationship.

Vf = Ve × [Ccp / (Ccp + Clcf)]

Since the value of Ccp / (Ccp + Clcf) is less than 1, the voltage Vf charged in the second liquid crystal capacitor Clcf is always smaller than the voltage Ve charged in the first liquid crystal capacitor Clce. This relationship holds true even when the voltage applied to the storage capacitor Cste is not the common voltage Vcom.

An appropriate ratio of the first liquid crystal capacitor Clce and the second liquid crystal capacitor Clcf voltage Vf can be obtained by adjusting the capacitance of the coupling capacitor Ccp.

As described above, in the present invention, the aperture ratio may be further improved, the side visibility may be improved, and the data voltage may be easily applied to the first and second subpixel electrodes separately. In addition, the vertical line expression is better and the transmittance can be increased in the medium and large display device. The capacitance of the storage capacitor, the area of the pixel electrode, and the distance between the data lines can be freely adjusted, and the overlapping area between the data lines and the pixel electrodes can be easily adjusted, so that the capacitance of the parasitic capacitor can be adjusted appropriately.

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 (27)

Substrate, and A plurality of pixel electrodes formed on the substrate and including first and second subpixel electrodes, respectively; / RTI &gt; The first subpixel electrode includes a first electrode including two parallelogram electrodes having different inclined directions and connected to each other. The second subpixel electrode includes a second electrode including two parallelogram electrodes having different inclination directions and connected to each other, and a third electrode including two parallelogram electrodes having different inclination directions and connected to each other. and, The first electrode and the second electrode included in one pixel electrode of the plurality of pixel electrodes are adjacent to each other in a first direction, The second electrode and the third electrode included in the pixel electrode are adjacent to each other in a second direction perpendicular to the first direction and are directly connected to each other. The horizontal center line passing through the boundary between the two parallelogram electrodes included in the first electrode coincides with the horizontal center line passing through the boundary between the two parallelogram electrodes included in the second electrode. Liquid crystal display device. In claim 1, The length of the second direction of the first electrode and the length of the second direction of the third electrode are different from each other. delete In claim 1, And the plurality of pixel electrodes are aligned in the first direction or the second direction. delete Substrate, and A plurality of pixel electrodes formed on the substrate and including first and second subpixel electrodes, respectively; / RTI &gt; The first subpixel electrode includes a first electrode including two parallelogram electrodes having different inclined directions and connected to each other. The second subpixel electrode includes at least two second electrodes, and each of the at least two second electrodes includes two parallelogram electrodes having different inclination directions and connected to each other. The at least two second electrodes included in one pixel electrode of the plurality of pixel electrodes are adjacent to each other in a first direction and directly connected to each other. The first electrode included in the pixel electrode is adjacent to the at least two second electrodes in a second direction perpendicular to the first direction, The length in the first direction of the second subpixel electrode is longer than the length in the first direction of the first subpixel electrode. Liquid crystal display In claim 6, And a length in the second direction of the first electrode and a length in the second direction of each of the at least two second electrodes are different from each other. 8. The method of claim 7, The second subpixel electrode includes three second electrodes, The first subpixel electrode is aligned with a second electrode located in the middle of the second electrodes. Liquid crystal display device. In claim 6, And the plurality of pixel electrodes are aligned in the first direction or the second direction. In claim 1, The length of the second direction of the first electrode is longer than the length of the second direction of the third electrode and less than twice. In claim 1, The area of the second subpixel electrode is 1.1 to 3 times the area of the first subpixel electrode. In claim 1, And a common electrode facing the pixel electrode and having a cutout. The electrode piece includes a pair of hypotenuses parallel to each other, And the cutout portion includes an oblique portion crossing the first and second subpixel electrodes and parallel to the hypotenuse of the electrode piece. In claim 1, The voltage of the first subpixel electrode and the voltage of the second subpixel electrode are different from each other. The method of claim 13, A first thin film transistor connected to the first subpixel electrode, A second thin film transistor connected to the second subpixel electrode, A first signal line connected to the first thin film transistor, A second signal line connected to the second thin film transistor, and A third signal line connected to the first and second thin film transistors and intersecting the first and second signal lines Liquid crystal display further comprising. The method of claim 14, And the first and second thin film transistors are turned on according to the signals from the first and second signal lines, respectively, to transfer the signals from the third signal line. The method of claim 14, And the first and second thin film transistors are turned on in response to a signal from the third signal line, respectively, to transmit a signal from the first and second signal lines. The method of claim 14, And a fourth signal line extending along a boundary between the first electrode and the third electrode and transmitting a common voltage. The method of claim 17, And the first and second thin film transistors respectively include first and second drain electrodes overlapping the fourth signal line. The method of claim 14, A fourth signal line extending along the horizontal center line of the first electrode and a fifth signal line extending along the horizontal center line of the third electrode; The fourth signal line and the fifth signal line transfer a common voltage. Liquid crystal display device. 20. The method of claim 19, And the first and second thin film transistors respectively include first and second drain electrodes overlapping the fourth and fifth signal lines. The method of claim 13, The first subpixel electrode and the second subpixel electrode are capacitively coupled. Substrate, and A plurality of pixel electrode sets formed on the substrate / RTI &gt; Each of the pixel electrode sets includes a plurality of pixel electrodes representing different colors, Each of the pixel electrodes includes first and second subpixel electrodes that are separated from each other. The first subpixel electrode includes a first electrode including two parallelogram electrodes having different inclined directions and connected to each other. The second subpixel electrode includes a second electrode and a third electrode directly connected to each other, and each of the second electrode and the third electrode includes two parallelogram electrodes having different inclination directions and connected to each other. , The overall shape of the first and second subpixel electrodes included in at least one of the plurality of pixel electrodes of each pixel electrode set is different from the overall shape of the first and second subpixel electrodes included in the remaining pixel electrodes. Liquid crystal display device. The method of claim 22, The plurality of pixel electrode sets have the same shape and are repeatedly arranged in a row direction and a column direction. The method of claim 22, The area of each pixel electrode of the pixel electrode set is the same. The method of claim 22, The pixel electrode set is arranged left or right. The method of claim 22, The area of the second subpixel electrode is 1.1 to 3 times the area of the first subpixel electrode. The method of claim 22, The voltage of the first subpixel electrode and the voltage of the second subpixel electrode are different from each other.

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