JP2012032839A - Display panel and liquid crystal display apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display apparatus which realizes a high aperture ratio and high transmittance.SOLUTION: A display panel comprises a substrate and a pixel electrode formed on the substrate and having a pair of first primary sides facing each other and a pair of second primary sides connected to the first primary sides and facing each other. The second primary sides of the pixel electrode comprise protrusions having the shape of teeth of a saw.

Description

  The present invention relates to a liquid crystal display device.

  The liquid crystal display device is one of the most widely used flat panel display devices, and includes two display plates on which a field generating electrode such as a pixel electrode and a common electrode is formed. And a polarizer attached to the outer surface of the liquid crystal layer and the display panel. The liquid crystal display device applies a voltage to the electric field generating electrode to generate an electric field in the liquid crystal layer, thereby determining the direction of the liquid crystal molecules in the liquid crystal layer and controlling the polarization of incident light to display an image.

  In particular, a vertically aligned mode liquid crystal display device in which the long axes of liquid crystal molecules are aligned perpendicular to the display panel in the absence of an electric field has a large contrast ratio and a wide reference viewing angle. In the spotlight.

  Specific methods for realizing a wide reference viewing angle in a vertical alignment type liquid crystal display device include a method of forming an incision in an electric field generation electrode and a method of forming a protrusion on the electric field generation electrode. Since the incision and the protrusion determine the direction in which the liquid crystal molecules are tilted, the reference viewing angle can be widened by appropriately arranging them to disperse the tilt directions of the liquid crystal molecules.

  On the other hand, the tilt direction of the liquid crystal molecules is known to have the highest light efficiency when it makes 45 ° with the polarization direction of the polarizer, and the polarizer is attached so that the polarization direction is parallel or perpendicular to the gate line or data line. It is common to do. For this reason, the incision and the protrusion are formed so as to extend at 45 ° from the gate line and the data line.

  However, in the liquid crystal display device in which the pixel electrode has a rectangular shape parallel to the gate line and the data line, the alignment of the liquid crystal molecules is disturbed by the electric field generated between the adjacent pixel electrodes, resulting in a texture. There is a problem that the transmittance decreases.

  In order to reduce such a texture, a portion overlapping the side of the pixel electrode is provided at the cut-out portion of the common electrode. In this case, the aperture ratio may be reduced.

  An object of the present invention is to improve the aperture ratio and transmittance.

A pixel electrode having a first incision formed in each pixel and dividing each pixel into a plurality of sub-regions;
A second electrode that divides each pixel into a plurality of sub-regions together with the first electrode, and a common electrode facing the pixel electrode;
A liquid crystal layer positioned between the pixel electrode and the common electrode;
With
Each of the sub-regions has a pair of main sides facing each other and a plurality of sub-sides connected thereto,
The main sides of two sub-regions respectively included in two adjacent pixel electrodes are shifted from each other,
The common electrode may be located in a gap between adjacent pixel electrodes, and may have a connection cutout that connects the second cutouts of adjacent pixels.

  In the liquid crystal display device according to the present invention, the vertical portion of the cut-out portion of the common electrode can be removed, and the removed region can be used as a transmission region. Further, by forming a connection portion corresponding to the gap of the pixel electrode in the common electrode, the sub electric field formed in the gap enhances the orientation of the liquid crystal in the sub region, and the texture is reduced, and the high aperture ratio and the high transmittance A liquid crystal display device that realizes the above can be provided.

1 is a layout view of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a layout view of a thin film transistor array panel for a liquid crystal display device of FIG. 1. FIG. 2 is a layout view of a common electrode panel for a liquid crystal display device of FIG. 1. 4 is a cross-sectional view taken along line IV-IV of the liquid crystal display device of FIG. FIG. 2 is a layout diagram of common electrodes and pixel electrodes in FIG. 1. FIG. 2 is an enlarged view showing between adjacent pixel electrodes shown in FIG. 1. FIG. 6 is a layout view of a liquid crystal display device according to another embodiment of the present invention. FIG. 8 is a layout view of a thin film transistor array panel for a liquid crystal display device of FIG. 7. FIG. 8 is a layout view of a common electrode panel for a liquid crystal display device of FIG. 7. FIG. 8 is a cross-sectional view taken along line XX of the liquid crystal display device of FIG. 7. It is sectional drawing along the XI-XI line of FIG. It is sectional drawing along the XII-XII line of FIG. FIG. 6 is a layout view of a liquid crystal display device according to another embodiment of the present invention. It is sectional drawing along the XIV-XIV line | wire of the liquid crystal display device of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1 in a liquid crystal display device according to another embodiment of the present invention. FIG. 6 is a layout view of a liquid crystal display device according to another embodiment of the present invention. FIG. 17 is a layout view of a thin film transistor panel for the thin film transistor panel of FIG. 16. FIG. 17 is a layout view of a common electrode panel for a liquid crystal display device of FIG. 16. It is sectional drawing which cut | disconnected the liquid crystal display device of FIG. 16 along the XIX-XIX line. It is sectional drawing which cut | disconnected the liquid crystal display device of FIG. 16 along the XX-XX line. FIG. 6 is a layout view of a liquid crystal display device according to another embodiment of the present invention. It is sectional drawing along the XXII-XXII line | wire of the liquid crystal display device of FIG. It is sectional drawing along the XXIII-XXIII line of FIG. FIG. 22 is a schematic equivalent circuit diagram for one pixel of the liquid crystal display device shown in FIG. 21. FIG. 6 is a layout view of a liquid crystal display device according to another embodiment of the present invention. It is sectional drawing along the XXVI-XXVI line of FIG. It is sectional drawing along the XXVII-XXVII line of FIG. FIG. 6 is a layout view of a liquid crystal display device according to another embodiment of the present invention. It is sectional drawing along the XXIX-XXIX line of FIG. FIG. 29 is a cross-sectional view of the liquid crystal display device of FIG. 28 taken along line XXX-XXX.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that a person having ordinary knowledge in the technical field to which the present invention belongs can easily carry out the embodiments. However, the present invention can be realized in various forms and is not limited to the embodiments described herein.

  In the drawings, the thickness is enlarged to clearly show various layers and regions. Similar parts are denoted by the same reference numerals throughout the specification. When a layer, film, region, plate, or other part is “on top” of another part, this is not limited to “immediately above” another part, and another part is in the middle. Including some cases. Conversely, when a part is “just above” another part, this means that there is no other part in the middle.

  A liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS.

  1 is a layout view of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a layout view of a thin film transistor array panel for a liquid crystal display device of FIG. 1, and FIG. 3 is a liquid crystal display device of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of the liquid crystal display device shown in FIG. 1, and FIG. 5 is a layout diagram of the common electrode and pixel electrode of FIG. FIG. 6 is an enlarged view between adjacent pixel electrodes in FIG.

  The liquid crystal display device according to the present embodiment includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, and a liquid crystal layer 3 sandwiched between the two display panels 100 and 200.

  First, the thin film transistor array panel 100 will be described in detail with reference to FIGS.

  A plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on an insulating substrate 110 made of transparent glass or plastic.

  The gate line 121 transmits a gate signal and extends mainly in the horizontal direction of FIG. Each gate line 121 has a wide end portion 129 for connection between a plurality of gate electrodes 124 protruding downward and 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 on the substrate 110, directly mounted on the substrate 110, or on the substrate 110. Can be integrated. When the gate driving circuit is integrated on the substrate 110, the gate line 121 can be extended and directly connected.

  The storage electrode line 131 is applied with a predetermined voltage and has a trunk line extending substantially parallel to the gate line 121 and a plurality of first, second, third, and fourth storage electrodes 133a, 133b, 133c, and 133d groups separated therefrom. And a plurality of connections 133e. Each storage electrode line 131 is located between two adjacent gate lines 121, and the trunk line is close to the upper side of the two gate lines 121.

  The first and second sustain electrodes 133a and 133b extend in the vertical direction of FIG. 1 and face each other. The first sustain electrode 133a has a fixed end connected to the main line and a free end opposite to the fixed end, and the free end includes a protrusion. The third and fourth sustain electrodes 133c and 133d extend obliquely from the center of the first sustain electrode 133a to the upper and lower ends of the second sustain electrode 133b. Connection portion 133e is connected between adjacent sustain electrodes 133a-133d. However, the shape and arrangement of the storage electrode line 131 can be modified into various forms.

  The gate line 121 and the storage electrode line 131 are made of aluminum metal such as aluminum (Al) or aluminum alloy, silver metal such as silver (Ag) or silver alloy, copper metal such as copper (Cu) or copper alloy, molybdenum (Mo). It is desirable to form with molybdenum metal such as 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 these conductive films is made of a metal having a low specific resistance such as an aluminum-based metal, a silver-based metal, or a copper-based metal so that signal delay and voltage drop can be reduced. In contrast, other conductive films have excellent physical, chemical, and electrical contact characteristics with other materials, particularly ITO (indium tin oxide) and IZO (indium zinc oxide), such as molybdenum-based metals, chromium, and the like. , Tantalum, titanium and the like. Good examples of such a combination include a chromium lower film and an aluminum (alloy) upper film, and an aluminum (alloy) lower film and a molybdenum (alloy) upper film. However, the gate line 121 and the storage electrode line 131 can be made of various metals or conductors.

  The 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 80 °.

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

  On the gate insulating film 140, a plurality of linear semiconductors 151 made of hydrogenated amorphous silicon (amorphous silicon is abbreviated as a-Si) or polycrystalline silicon are formed. The linear semiconductor 151 mainly extends in the vertical direction of FIG. 1 and includes a plurality of protrusions 154 extending toward the gate electrode 124. The linear semiconductor 151 is wide in the vicinity of the gate line 121 and the storage electrode line 131 and covers these widely.

  A plurality of linear and island-shaped ohmic contact members 161 and 165 are formed on the semiconductor 151. The ohmic contact members 161 and 165 are preferably made of a material such as n + hydrogenated amorphous silicon doped with an n-type impurity such as phosphorus at a high concentration, or made of silicide. The linear ohmic contact member 161 has a plurality of protrusions 163, and the protrusions 163 and the island-like ohmic contact member 165 are arranged on the protrusions 154 of the semiconductor 151 in pairs.

  The side surfaces of the semiconductor 151 and the ohmic contact members 161 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, a plurality of drain electrodes 175, and a plurality of isolated metal pieces 178 are formed on the ohmic contacts 161 and 165 and the gate insulating film 140.

  The data line 171 transmits a data voltage and extends mainly in the vertical direction of FIG. 1 and intersects the gate line 121, the main line of the storage electrode line 131, and the connection part 133e. Each data line 171 has a wide end 179 for connecting a plurality of source electrodes 173 extending toward the gate electrode 124 and bent in a C shape to other layers or an external driving circuit. A data driving circuit (not shown) for generating a data voltage is mounted on a flexible printed circuit film (not shown) attached on the substrate 110, directly mounted on the substrate 110, or on the substrate 110. Can be integrated. When the data driving circuit is integrated on the substrate 110, the data line 171 can be extended and directly connected thereto.

  The drain electrode 175 is separated from the data line 171 and faces the source electrode 173 with the gate electrode 124 as the center. Each drain electrode 175 has a wide one end and a rod-like other end, and the rod-like end is partially surrounded by the source electrode 173.

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

  The isolated metal piece 178 is located on the gate line 121 in the vicinity of the first sustain electrode 133a.

  The data line 171, the drain electrode 175, and the metal piece 178 are preferably made of a refractory metal such as molybdenum, chromium, tantalum, and titanium, or an alloy thereof, and a refractory metal film (not shown) and a low-resistance conductive film ( It may have a multilayer structure including (not shown). Examples of the multi-layer structure include a chromium / 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. There is a membrane. However, the data line 171, the drain electrode 175, and the metal piece 178 may be made of various metals or conductors.

  The side surfaces of the data line 171, the drain electrode 175, and the metal piece 178 are preferably inclined at an angle of about 30 ° to 80 ° with respect to the surface of the substrate 110.

  The ohmic contact members 161 and 165 exist only between the semiconductor 151 thereunder and the data line 171 and drain electrode 175 thereabove, and lower the contact resistance therebetween. Although the linear semiconductor 151 is narrower than the data line 171 in most places, as described above, the data line can be formed by making the step shape of the surface gentle by forming a wider width at the portion that intersects the gate line 121. 171 disconnection is prevented. The semiconductor 151 has an exposed portion that is not covered with the data line 171 and the drain electrode 175, as between the source electrode 173 and the drain electrode 175.

  A protective film 180 is formed on the data line 171, the drain electrode 175, the metal piece 178, and the exposed semiconductor 151 portion. The protective film 180 may be made of an inorganic insulator or an organic insulator, and the surface thereof may be planarized. Examples of the inorganic insulator include silicon nitride and silicon oxide. The organic insulator should have photosensitivity, and its dielectric constant is desirably about 4.0 or less. However, it is desirable that the protective film 180 has a double film structure of a lower inorganic film and an upper organic film so as not to harm the exposed semiconductor 151 portion while taking advantage of the excellent insulating properties of the organic film.

  A plurality of contact holes (contact holes) 182 and 185 exposing the end 179 of the data line 171 and the drain electrode 175 are formed in the protective film 180, and the end of the gate line 121 is formed in the protective film 180 and the gate insulating film 140. A plurality of contact holes 181 exposing the portion 129, a plurality of contact holes 183a exposing the protruding portion of the free end of the first sustain electrode 133a, and a part of the storage electrode line 131 near the fixed end of the first sustain electrode 133a. A plurality of contact holes 183b to be exposed are formed.

  A plurality of pixel electrodes 191, a plurality of connection bridges 83, and a plurality of contact assisting members 81 and 82 are formed on the protective film 180. These are preferably formed 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 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 generates an electric field together with the common electrode 270 of the common electrode panel 200 that receives the application of the common voltage, thereby forming the liquid crystal molecules 31 of the liquid crystal layer 3 between the two electrodes 191 and 270. Determine the direction. The polarization of the light passing through the liquid crystal layer 3 changes depending on the direction of the liquid crystal molecules 31 determined in this way. The pixel electrode 191 and the common electrode 270 form a capacitor (hereinafter referred to as “liquid crystal capacitor”), and maintain the applied voltage even after the thin film transistor is turned off.

  The pixel electrode 191 overlaps with the storage electrode line 131 including the storage electrodes 133a to 133d. A capacitor in which the pixel electrode 191 and the drain electrode 175 electrically connected to the pixel electrode 191 overlap with the storage electrode line 131 is called a storage capacitor, and the storage capacitor reinforces the voltage maintenance capability of the liquid crystal capacitor.

  A central incision 91, a lower incision 92a, and an upper incision 92b are formed in the pixel electrode 191, and the pixel electrode 191 is divided into a plurality of regions by the incision 91-92b. The incision portions 91-92b are substantially inversion symmetric with respect to a virtual horizontal center line that bisects the pixel electrode 191.

  The lower and upper cutouts 92a and 92b extend obliquely from the right side to the left side of the pixel electrode 191, and overlap with the fourth and third sustain electrodes 133d and 133c, respectively. The lower and upper cutouts 92a and 92b are respectively located in the lower half and the upper half with respect to the horizontal center line of the pixel electrode 191. The lower and upper cutouts 92a and 92b form about 45 ° with respect to the gate line 121 and extend perpendicular to each other.

  The central cutout 91 extends along the horizontal center line of the pixel electrode 191 and has an entrance on the right side. The entrance of the central incision 91 has a pair of hypotenuses substantially parallel to the lower incision 92a and the upper incision 92b, respectively.

  Accordingly, the lower half of the pixel electrode 191 is divided into two regions by the lower cutout 92a, and the upper half is also divided into two regions by the upper cutout 92b.

  As shown in FIG. 5, each pixel electrode 191 has a pair of first main sides 193 and 194 facing each other and a pair of second main sides 195 and 196 connected thereto. The first main sides 193 and 194 are substantially parallel to the gate line 121, and the second main sides 195 and 196 have inner and outer envelopes 951, 952, 961, and 962 that are substantially parallel to the data line 171. The envelopes 951, 961, 952, 962 inside or outside the first main sides 193, 194 and the second main sides 195, 196 are substantially rectangular. The left corner of the pixel electrode 191 is chamfered to form oblique sides 193 c and 194 c, and the chamfered oblique sides 193 c and 194 c form an angle of about 45 ° with respect to the gate line 121.

  The second main sides 195 and 196 of the pixel electrode 191 have a plurality of vertical line segments 915 and 925 positioned on the inner envelopes 951 and 961, and a plurality of sawtooth portions 910 and 920 projecting outward from the pixels. The electrode 191 is substantially symmetric with respect to the horizontal center line.

  Each saw-like portion 910, 920 has first oblique sides 911, 921 and second oblique sides 912, 922 that face each other, and upper sides 913, 923 that connect them and lie on outer envelopes 952, 962. The first hypotenuses 911 and 921 intersect the vertical line segments 915 and 925 at an obtuse angle greater than about 135 °, and the second hypotenuses 912 and 922 form an angle of about 45 ° with the vertical line segments 915 and 925. The extension lines of 911, 921 and the second hypotenuses 912, 922 intersect each other with an acute angle smaller than about 45 °. The second hypotenuses 912 and 922 are substantially parallel to the lower and upper incisions 92a and 92b, and are on the extension line of the incisions 92a and 92b. The first hypotenuses 911 and 921 are the lower and upper incisions 92a and 92b. And an angle of less than about 45 ° or greater than 135 °.

  The upper portions of the saw-shaped portions 910 and 920, that is, the vicinity of the upper sides 913 and 923 overlap with the data lines 171, and the saw-tooth portions 920 of the right side 196 of the pixel electrode 191 located on the left side around the data lines 171 and the right side. The saw-toothed portion 910 of the pixel electrode 191 located is arranged so as to mesh. The opposing sides of the saw-like portions 910 and 920 that mesh with each other are parallel to each other.

  The number of saw-like portions 910 and 920 is closely related to the number of pixel electrode 191 regions or the number of cut-out portions divided by the incisions 91 to 92b. The number of pixel electrode 191 regions and the number of saw-like portions 910 and 920 The number varies depending on design factors such as the size of the pixel electrode 191, the ratio of the length of the horizontal side to the vertical side of the pixel electrode 191, and the type and characteristics of the liquid crystal layer 3.

  The connection bridge 83 crosses the gate line 121 and exposes the exposed portion of the storage electrode line 131 and the free end of the first storage electrode 133a via contact holes 183a and 183b located on the opposite side with the gate line 121 interposed therebetween. Connected to the end. The storage electrode lines 131 including the storage electrodes 133a and 133b can be used together with the connection bridge 83 to repair defects in the gate lines 121, the data lines 171, or the thin film transistors.

  The contact assistants 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 contact holes 181 and 182, respectively. The contact assisting members 81 and 82 supplement 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.

  Hereinafter, the common electrode panel 200 will be described with reference to FIGS. 1, 3, and 4.

  A light shielding member 220 is formed on an insulating substrate 210 made of transparent glass or plastic. The light blocking member 220 is also called a black matrix and prevents light leakage between the pixel electrodes 191. The light shielding member 220 faces the pixel electrode 191 and has a plurality of openings 225 that are substantially rectangular. The width (W) of the portion 221 corresponding to the data line 171 of the light shielding member 220 is substantially the same as the width of the data line 171 (however, an alignment error between the display panels 100 and 200 can be taken into account). It includes an extension 222 that blocks the space between the mating saw-like portions 910, 920 that protrudes out of line 171. The light shielding member 220 preferably further includes a portion corresponding to the thin film transistor.

  A plurality of color filters 230 are formed on the substrate 210. It is desirable that the color filter 230 exists mostly in a region surrounded by the light shielding member 230 and extends long in the vertical direction along the column of the pixel electrodes 191. Each color filter 230 can display one of the basic colors such as the three primary colors of red, green, and blue.

  An overcoat film 250 is formed on the color filter 230 and the light shielding member 220. The overcoat film 250 is preferably made of an (organic) insulator, and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat film 250 can be omitted.

  A common electrode 270 is formed on the overcoat film 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO, and the common electrode 270 is formed with a plurality of incisions 71, 72a, 72b.

  One incision 71-72b group faces one pixel electrode 191, and includes a central incision 71, a lower incision 72a, and an upper incision 72b. Each of the incisions 71-72b is disposed between adjacent incisions 91-92b of the pixel electrode 191 or between the incisions 92a, 92b and the chamfered oblique sides of the pixel electrode 191. Each incision 71-72b extends substantially parallel to the lower incision 92a or the upper incision 92b of the pixel electrode 191, includes at least one hatched portion, and at least one notch recessed in each hatched portion. (Notch) 7. The cut-out portions 71-72b are almost inverted and symmetric with respect to the horizontal center line of the pixel electrode 191.

  Each of the lower and upper cutouts 72a and 72b includes a hatched portion and a lateral portion. The hatched portion generally extends from the upper side or the lower side of the pixel electrode 191 to the left side, and overlaps the vertical side of the pixel electrode 191. The opposite long sides of the shaded portion generally meet or are on the first and second oblique sides 911, 912, 921, 922 of the protruding portion of the pixel electrode 191 or their extension lines. The horizontal portion extends from each end of the shaded portion along the horizontal side of the pixel electrode 191 while overlapping the horizontal side, and forms an obtuse angle with the shaded portion.

  The central incision 71 includes a central lateral portion and a pair of hatched portions. The central horizontal portion extends from the left side of the pixel electrode 191 to the right side along the horizontal center line of the pixel electrode 191. The pair of shaded portions extend substantially parallel to the lower and upper cutouts 72a and 72b, respectively, while forming an obtuse angle with the central horizontal portion from the end of the central horizontal portion toward the right side of the pixel electrode 191.

  In addition, the number of incisions 71-72b varies depending on the design element, and the light shielding member 220 can be overlapped with the incisions 71-72b to block light leakage near the incisions 71-72b. On the common electrode 270, a spacing member 320 made of an insulating material is formed to maintain a constant spacing between the two display panels 100 and 200.

  Alignment films 11 and 21 are applied to the inner side surfaces of the display panels 100 and 200, and these may be vertical alignment films. Polarizers 12 and 22 are provided on the outer surfaces of the display panels 100 and 200. The polarization axes of the two polarizers 12 and 22 are orthogonal to each other, and hatched portions of the hatched cutout portions 92a and 92b and cutout portions 71 to 72b. And an angle of approximately 45 °. In the case of a reflective liquid crystal display device, one of the two polarizers 12 and 22 can be omitted.

  The liquid crystal display device according to the present embodiment preferably further includes a phase retardation film (not shown) for compensating for the delay of the liquid crystal layer 3. Furthermore, the liquid crystal display device preferably includes polarizers 12 and 22, a phase retardation film, display plates 100 and 200, and an illumination unit (not shown) that supplies light to the liquid crystal layer 3.

  The liquid crystal layer 3 has a negative dielectric anisotropy, and the liquid crystal molecules 31 of the liquid crystal layer 3 have their major axes substantially perpendicular to the surfaces of the two display panels 100 and 200 in the absence of an electric field. Oriented. For this reason, incident light cannot pass through the orthogonal polarizers 12 and 22 and is blocked.

  When a common voltage is applied to the common electrode 270 and a data voltage is applied to the pixel electrode 191, a main electric field that is substantially perpendicular to the surfaces of the display panels 100 and 200 is generated (hereinafter, the pixel electrode 191 and the common electrode 270 are connected). It is called an electric field generating electrode). In response to the electric field, the liquid crystal molecules 31 attempt to change the direction so that the major axis is perpendicular to the direction of the electric field.

  As shown in FIGS. 1 and 5, one incision group 71-72b, 91-92b divides the pixel electrode 191 into a plurality of sub-regions, and each sub-region is a first main side 193, 194 of the pixel electrode 191. And two sub-sides that are part of the sides 193 to 196 of the pixel electrode 191. One of the main sides of each sub-region is configured by intersecting one side of the cut-out portions 91-92b of the pixel electrode 191 with the second oblique sides 912, 922 of the saw-shaped portions 910, 920, or a chamfered oblique side 193c. 194c, and the other of the main sides is constituted by only one side of the hatched portion of the cut-out portion 71-72b of the common electrode 270 or the saw-shaped portions 910 and 920 of the hatched portion of the cut-out portion 71-72b. The second oblique sides 912 and 922 intersect each other. For this reason, the lengths of the main sides of the sub-regions are different from each other, and the adjacent main sides of the adjacent sub-regions are shifted from each other. One of the sub-sides of each sub-region is the first hypotenuses 911 and 921 of the saw-like portions 910 and 920 of the pixel electrode 191 and intersects the main side at an angle greater than 135 °. The main side makes about 45 ° with the polarization axes of the polarizers 12 and 22 in order to maximize the light efficiency.

  However, since the main side is extremely longer than the sub-side, and at least one of the sub-sides intersects the main side at an angle greater than 135 °, the main electric field on these sub-regions has a horizontal component perpendicular to the main side. It is much larger than the horizontal component parallel to the side. For this reason, the liquid crystal molecules 31 on each sub-region are mostly inclined in a direction perpendicular to the main side.

  The liquid crystal molecules 31 on each sub-region are mostly tilted in a direction perpendicular to the main side, and the tilting directions are roughly four directions. Thus, the reference viewing angle of the liquid crystal display device is increased by diversifying the directions in which the liquid crystal molecules 31 are inclined.

  As shown in FIG. 6, the direction of the sub-electric fields E1 and E2 that are generated by the voltage difference between the pixel electrodes 191 is mainly one sub-side of the sub-region, that is, the saw-shaped portions 910 and 920. Are perpendicular to the first hypotenuses 911, 921. Therefore, the directions of the sub electric fields E1 and E2 form an angle smaller than about 15 ° with the horizontal component direction of the main electric field. Eventually, the sub electric field between the pixel electrodes 191 acts in a direction that enhances the determination of the tilt direction of the liquid crystal molecules 31.

  Thus, the vertical sides 195 of the pixel electrode 191 are provided by providing the saws 910 and 920 having the oblique sides 911 and 921 having an angle larger than 135 ° with the cutout portions 91-92b and 71-72b on the horizontal sides of the pixel electrode 191. When the horizontal component direction of the main electric field near 196 and the direction of the sub electric field are brought closer to the horizontal component direction of the main electric field in the center of the sub region, the distance between the adjacent pixel electrodes 191 is shortened, and the strength of the sub electric field is increased. The tilt direction of the liquid crystal molecules located in the vicinity of the saw-like portions 910 and 920 of the electrode 191 substantially coincides with the tilt direction of the liquid crystal molecules in the center of the subregion, and the saw-like portions 910 and 920 can also be used as an effective display region. .

  As a result, the effective display area is widened and the transmittance is improved as compared with the case where the saw-shaped portions 910 and 920 are not provided, and the cut-out portions 71-72b of the common electrode 270 do not have a portion overlapping the vertical side of the pixel electrode 191. This improves the aperture ratio.

  On the other hand, for the liquid crystal molecules located in the oblique line incision part of the pixel electrode 191, the orientation direction cannot be determined quickly, and texture may be generated. However, the third and fourth maintenance extending in the oblique line direction may occur. The electrodes 133c and 133d act as control electrodes for controlling the liquid crystal in this portion, and the texture generated at the center of the oblique line incisions 92a and 92b can be reduced.

  The width of the incisions 71-72b and 91-92b is preferably about 9 μm to about 12 μm.

  The notch 7 of the cutout 71-72b of the common electrode 270 determines the inclination direction of the liquid crystal molecules 31 located on the cutout 71-72b. The notch 7 may be formed in the cutouts 91-92b of the pixel electrode 191.

  The shape and arrangement of the incisions 71-72b, 91-92b and the notches 7 can be modified into various forms.

  At least one incision 71-72b, 91-92b may be replaced by a protrusion (not shown) or a depression (not shown). The protrusion is preferably made of an organic material or an inorganic material, and is disposed on or below the electric field generating electrodes 191 and 270.

  7 is a layout view of a liquid crystal display device according to another embodiment of the present invention, FIG. 8 is a layout view of a thin film transistor array panel for a liquid crystal display device of FIG. 7, and FIG. 9 is a liquid crystal display of FIG. FIG. 10 is a layout view of the device common electrode panel, and FIG. 10 is a cross-sectional view taken along line XX of the liquid crystal display device of FIG.

  7 to 10, the liquid crystal display according to an embodiment of the present invention is sandwiched between the thin film transistor array panel 100 and the common electrode panel 200 and the two display panels 100 and 200 facing each other. A liquid crystal layer 3 is provided.

  First, the thin film transistor array panel 100 will be described with reference to FIGS.

  A plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on an insulating substrate 110 made of transparent glass or plastic.

  The gate line 121 transmits a gate signal and extends mainly in the lateral direction of FIG. Each gate line 121 has a wide end portion 129 for connecting a plurality of gate electrodes 124 projecting upward to another layer or an external driving circuit. The storage electrode line 131 is applied with a predetermined voltage and extends substantially parallel to the gate line 121. Each storage electrode line 131 is located between two adjacent gate lines 121 and has the same distance as the two gate lines 121. The storage electrode line 131 includes a storage electrode 137 extended downward. However, the shape and arrangement of the storage electrode line 131 can be modified into various forms.

  The 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 80 °.

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

  A plurality of island-shaped semiconductors 154 made of hydrogenated amorphous silicon or polycrystalline silicon are formed on the gate insulating film 140. The semiconductor 154 is located on the gate electrode 124 and includes an extension that covers the boundary of the gate line 121. A plurality of island-shaped ohmic contact members 163 and 165 are formed on the semiconductor 154. The ohmic contact members 163 and 165 are preferably made of a material such as n + hydrogenated amorphous silicon doped with an n-type impurity such as phosphorus at a high concentration, or made of silicide. The ohmic contact members 163 and 165 are disposed on the semiconductor 154 in a pair.

  The side surfaces of the semiconductor 154 and the ohmic contact members 163 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is in the range of 30 to 80 °.

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

  The data line 171 transmits a data voltage and extends mainly in the vertical direction of FIG. 7 and intersects the gate line 121 and the storage electrode line 131. Each data line 171 has a wide end 179 for connecting a plurality of source electrodes 173 extending toward the gate electrode 124 to other layers or an external driving circuit. The drain electrode 175 is separated from the data line 171 and faces the source electrode 173 with the gate electrode 124 as the center. Each drain electrode 175 has a wide end portion 177 and a rod-like other end portion. The rod-shaped end is partially surrounded by a U-shaped source electrode 173.

  The side surfaces of the data line 171 and the drain electrode 175 are desirably inclined at an angle of 30 to 80 ° with respect to the surface of the substrate 110.

  The ohmic contact members 163 and 165 exist only between the lower semiconductor 154 and the data line 171 and drain electrode 175 thereabove, thereby reducing the contact resistance.

  A protective film 180 is formed on the data line 171, the drain electrode 175, and the exposed semiconductor 154 portion. The protective film 180 is made of an inorganic insulator or an organic insulator, and the surface may be planarized.

  A plurality of contact holes 182 and 185 exposing the end 179 of the data line 171 and the drain electrode 175 are formed in the protective film 180, and the end 129 of the gate line 121 is exposed in the protective film 180 and the gate insulating film 140. A plurality of contact holes 181 are formed.

  A plurality of pixel electrodes 191 and a plurality of contact assisting members 81 and 82 are formed on the protective film 180. These are preferably made of a transparent conductive material such as ITO or IZO, or a reflective metal such as aluminum or silver alloy.

  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 overlaps with the storage electrode line 131 including the storage electrode 137.

  Each pixel electrode 191 is connected to a pair of first main sides 193 and 194 facing each other, and the first main sides 193 and 194, and a plurality of saw-shaped portions 90 are connected to the saw-shaped portions 90. And has a second main side including a bottom side 90c. Here, the saw-shaped portion 90 has a first oblique side 90a and a second oblique side 90d inclined with respect to the first main sides 193 and 194, and an upper side 90b connecting the first oblique side 90a and the second oblique side 90d. The first main sides 193 and 194 are parallel to the gate line 121. The first main sides 193 and 194 and the second main side are substantially rectangular, and the four corners of the pixel electrode 191 are chamfered to form an angle of about 45 ° with the gate line 121.

  The first oblique side 90a partially overlaps with the data line 171. The first oblique sides 90a of the two adjacent pixel electrodes 191 face each other and are parallel to each other.

  The pixel electrode 191 is formed with first and second central incisions 91 and 92, lower oblique incisions 93a, 94a and 95a, and upper oblique incisions 93b, 94b and 95b. The pixel electrode 191 has the incisions 91 to 95b. Is divided into a plurality of sub-regions. The incisions 91 to 95b are almost reversed and symmetrical with respect to the storage electrode line 131. The lower and upper oblique line incisions 93a to 95a and 93b to 95b extend obliquely from the right side of the pixel electrode 191 to the left side, the upper side, or the lower side. The lower and upper oblique line incisions 93 a to 95 a and 93 b to 95 b are respectively located in the lower half and the upper half with respect to the storage electrode line 131. The lower and upper oblique cutouts 93a to 95a and 93b to 95b form an angle of about 45 ° with respect to the gate line 121 and extend perpendicular to each other. The lower and upper oblique cutouts 93a to 95a and 93b to 95b preferably have entrances on the left side or the right side of the pixel electrode 191, and the entrances are preferably connected to the recesses 90c.

  The first oblique side 90a constituting the second main side saw 90 has an obtuse angle with the oblique line incisions 93a to 95a and 93b to 95b of the pixel electrode 191, and the second oblique side 90d is the oblique line incisions 93a to 95a and 93b to 95b. Is almost parallel to.

  The first central incision 91 extends along the storage electrode line 131 and has an entrance on the left side. The second central cutout 92 has a polygonal shape, and upper and lower corners located on the left side of the pixel electrode 191 are projected.

  Thus, the lower half of the pixel electrode 191 is divided into four regions by the lower cutouts 93a to 95a, and the upper half is also divided into four regions by the upper cutouts 92b to 95b. At this time, the number of regions or the number of incisions varies depending on design factors such as the size of the pixel, the length ratio of the horizontal and vertical sides of the pixel electrode, and the type and characteristics of the liquid crystal layer 3.

  The contact assistants 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.

  Hereinafter, the common electrode panel 200 will be described with reference to FIGS. 7, 9, and 10.

  A light shielding member 220 is formed on an insulating substrate 210 made of transparent glass or plastic. The light shielding member 220 includes a linear portion 221 corresponding to the data line 171, a partially expanded portion 222 and a planar portion 223 corresponding to the thin film transistor, and prevents light leakage between the pixel electrodes 191. An opening area facing 191 is defined. However, it is desirable that the light shielding member 220 has a plurality of openings (not shown) facing the pixel electrode 191 and having substantially the same shape as the pixel electrode 191.

  A plurality of color filters 230 are formed on the substrate 210. It is desirable that the color filter 230 exists mostly in a region surrounded by the light shielding member 230 and extends long in the vertical direction along the row of pixel electrodes 191. Each color filter 230 can display one of the basic colors such as the three primary colors of red, green, and blue.

  An overcoat film 250 is formed on the color filter 230 and the light shielding member 220. The overcoat film 250 is preferably made of an (organic) insulator, and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat film 250 can be omitted.

  A common electrode 270 is formed on the overcoat film 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO.

  A plurality of incisions 71, 72a, 72b, 73a, 73b, 74a, 74b, 75 are formed in the common electrode 270.

  One incision group 71 to 75 faces one pixel electrode 191, and includes a central incision 71, first to third lower oblique incisions 72a, 73a, 74a, first to third upper oblique incisions 72b, 73b, 74b and connecting portion 75. Each of the incisions 71 to 74b is between the adjacent incisions 91, 92, 93a, 93b, 94a, 94b, 95a, and 95b of the pixel electrode 191 or between the incisions 91, 92, 93a, 93b, 94a, 94b, 95a, and 95b. The pixel electrode 191 is disposed between the chamfered oblique sides. Each of the incisions 71 to 74b includes at least one hatched portion extending in parallel to the lower incisions 93a, 94a, and 95a of the pixel electrode 191 or the upper incisions 93b, 94b, and 95b.

  The first lower and first upper oblique cutouts 72a and 72b extend from the right side of the pixel electrode 191 to the left side of the pixel electrode 191, and the second lower and second upper oblique cutouts 73a and 73b are the pixel electrode 191. Extends from the right side of the pixel electrode 191 to the upper left or lower left corner of the pixel electrode 191. The third lower and third upper oblique incisions 74a and 74b extend from the right side of the pixel electrode 191 to the upper side or lower side of the pixel electrode 191, and the third lower and third upper oblique incisions 74a, It includes a vertical horizontal portion that extends from each end of 74 b while overlapping along the side of the pixel electrode 191. The vertical transverse part forms an obtuse angle with the oblique line incisions 74a and 74b.

  The central incision 71 includes a central lateral portion and a pair of hatched portions. The central horizontal portion extends from the right side of the pixel electrode 191 to the left along the storage electrode line 131, and the pair of hatched portions are the lower and upper diagonal lines from the end of the central horizontal portion toward the left side of the pixel electrode 191, respectively. It extends substantially parallel to the incisions 72a-74b.

  One end of the second lower cutout 73a of the pixel electrode adjacent to one end of the hatched portion of the central cutout 71, and the second upper cutout 73b of the pixel electrode adjacent to one end of the other hatched portion of the central cutout 71. One end, one end of the third lower oblique cutout portion 74a of the pixel electrode adjacent to one end of the first lower oblique cutout portion 72a, and the third upper oblique cutout portion 74b of the pixel electrode adjacent to one end of the first upper oblique cutout portion 72b. One end of each is connected to the connecting portion 75. The connecting portion 75 is parallel to the first oblique side 90 a of the pixel electrode 191 and is located at a portion corresponding to the data line 171. The width of the connecting portion 75 is preferably about 8 μm wider than the distance between the pixel electrode 191 and the pixel electrode 191, and the extended portion 222 of the light shielding member 220 is preferably wider than the other portion corresponding to the connecting portion 75.

  In this way, by forming the side adjacent to the data line 171 in the shape of a saw among the sides of the pixel electrode 191, as described in the embodiment with reference to FIGS. The sub-electric field formed in this acts in the direction of strengthening the alignment of the liquid crystal in the sub-region. Further, by providing the connection portion 75 at a position corresponding to the region where the first oblique sides 90a of the two adjacent pixel electrodes 191 face each other, the alignment of the liquid crystal in the sub region can be further enhanced.

  Such an effect will be described with reference to FIGS.

  11 is a cross-sectional view taken along line XI-XI in FIG. 6, and FIG. 12 is a cross-sectional view taken along line XII-XII in FIG.

  As shown in FIG. 11, the electric field formed between the pixel electrode 191 and the common electrode 270 has a sub-electric field in a direction that disturbs the uniform alignment of the liquid crystal in the sub-region at the boundary between the adjacent pixel electrodes 191. For this reason, collision of liquid crystal occurs inside the subregion, and there is a possibility that the alignment of the liquid crystal is disturbed.

  However, if the connection portion 75 is formed at a position corresponding to the region where the first oblique sides 90a of the two pixel electrodes 191 face each other as in the embodiment of the present invention, as shown in FIG. The direction of the electric field formed between the common electrode 270 and the pixel electrode 191 is changed by the connecting portion 75, and a sub electric field in a direction that enhances the uniform alignment of the liquid crystal in the sub region is formed. Thereby, the liquid crystal collision as shown in FIG. 11 does not occur, and the texture is reduced.

  Each incision 71-74b preferably has a plurality of recessed notches 7 regularly arranged at a certain distance.

  The number and direction of the incisions 71 to 75 vary depending on design elements.

  Alignment films 11 and 21 are applied to the inner side surfaces of the display panels 100 and 200, and these may be vertical alignment films. Polarizers (not shown) are provided on the outer surfaces of the display panels 100 and 200, the transmission axes of the two polarizers are orthogonal, and one of the transmission axes is parallel to the gate line 121. Is desirable. In the case of a reflective liquid crystal display device, one of the two polarizers can be omitted.

  The liquid crystal display device preferably includes a polarizer, display plates 100 and 200, and an illumination unit (not shown) that supplies light to the liquid crystal layer 3.

  The liquid crystal layer 3 has a negative dielectric anisotropy, and the liquid crystal molecules of the liquid crystal layer 3 are aligned so that the major axis is perpendicular to the surfaces of the two display panels 100 and 200 in the absence of an electric field. ing. For this reason, incident light cannot pass through the orthogonal polarizer and is blocked.

  The above-described embodiments can be similarly applied to the following embodiments.

  Hereinafter, a liquid crystal display according to another exemplary embodiment of the present invention will be described in detail with reference to FIGS. 13 and 14.

  FIG. 13 is a layout view of a liquid crystal display device according to another embodiment of the present invention, and FIG. 14 is a cross-sectional view of the liquid crystal display device of FIG. 13 taken along line XIV-XIV.

  As shown in FIGS. 13 and 14, the liquid crystal display according to an embodiment of the present invention also includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, and a liquid crystal layer 3 sandwiched between the display panels 100 and 200. , And a pair of polarizers 12 and 22 attached to the outer surfaces of the display panels 100 and 200.

  The layered structure of the display panels 100 and 200 according to the present embodiment is substantially the same as that shown in FIGS.

  In the thin film transistor array panel 100, a plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on a substrate 110. The gate line 121 includes a plurality of gate electrodes 124 and end portions 129, and the storage electrode line 131 includes a plurality of storage electrodes 133a to 133d and a plurality of connection portions 133e. On the gate line 121 and the storage electrode line 131, the gate insulating film 140, the plurality of linear semiconductors 151 including the protrusions 154, the plurality of linear ohmic contact members 161 including the protrusions 163, and the plurality of island-shaped ohmic contact members 165 are provided. Are formed in order.

  A plurality of data lines 171 including a source electrode 173 and an end 179, a plurality of drain electrodes 175, and a plurality of isolated metal pieces 178 are formed on the ohmic contact members 161 and 165, and a protective film 180 is formed thereon. ing. A plurality of contact holes 181, 182, 183 a, 183 b and 185 are formed in the protective film 180 and the gate insulating film 140. On the protective film 180, a plurality of pixel electrodes 191 having a cut-out portion 91-92b, a plurality of connection bridges 83, and a plurality of contact assistants 81, 82 are formed, and the alignment film 11 is formed thereon.

  For the common electrode panel 200, a light shielding member 220, a plurality of color filters 230, an overcoat film 250, a common electrode 270 having an incision portion 71-72 b, and an alignment film 21 are formed on the insulating substrate 210.

  However, unlike the liquid crystal display device shown in FIGS. 1 to 4, the linear semiconductor 151 has substantially the same planar shape as the data line 171, the drain electrode 175, and the ohmic contact members 161 and 165 therebelow. However, the linear semiconductor 151 has an exposed portion that is not covered with the data line 171 and the drain electrode 175 including the space between the source electrode 173 and the drain electrode 175.

  In addition, an ohmic contact member (not shown) and an island-like semiconductor (not shown) having substantially the same planar shape as the isolated metal piece 178 are also formed under the isolated metal piece 178.

  The thin film transistor array panel 100 is manufactured by forming the data line 171, the drain electrode 175, the metal piece 178, the semiconductor 151, and the ohmic contact members 161 and 165 in one photoetching process.

  That is, a semiconductor layer, an ohmic contact layer, and a data metal layer are continuously deposited on the gate insulating film 140, and a photosensitive film having a different thickness is formed thereon, and then the semiconductor layer, the ohmic contact layer is used as an etching mask. The thin film transistor array panel shown in FIGS. 13 and 14 is manufactured by etching the data metal layer.

  Here, the photosensitive film having different thickness depending on the position has a first portion and a second portion in order of decreasing thickness, and the first portion is located in a wiring region occupied by the data line 171, the drain electrode 171 and the metal piece 178. The second portion is located in the channel region of the thin film transistor.

  As a method of varying the thickness of the photosensitive film depending on the position, for example, there is a method of providing a translucent region in addition to the light transmitting region and the light shielding region on the optical mask. The translucent region includes a slit pattern, a lattice pattern, or a thin film having an intermediate transmittance or an intermediate thickness. When the slit pattern is used, it is preferable that the width of the slit and the interval between the slits are smaller than the resolution of the exposure device used in the photographic process. Another example is a method using a reflowable photosensitive film. That is, after forming a reflowable photosensitive film with a normal exposure mask having only a light-transmitting area and a light-shielding area, a thin portion is formed by reflowing to flow to an area where the photosensitive film does not remain.

  Using the photosensitive film as an etching mask, the data metal layer, the resistive contact layer, and the semiconductor layer are continuously etched to form a rough shape of the data wiring. Next, the photosensitive film is ashed to remove the second portion, and the exposed data metal layer and the resistive contact layer are etched using the remaining first portion as an etching mask to form a channel portion of the thin film transistor.

  In this way, one photo process can be reduced, and the manufacturing method is simplified.

  Many features of the liquid crystal display device shown in FIGS. 1 to 12 can be applied to the liquid crystal display device shown in FIGS.

  Hereinafter, a liquid crystal display according to another exemplary embodiment of the present invention will be described in detail with reference to FIG.

  FIG. 15 is a cross-sectional view taken along line IV-IV of FIG. 1, showing a liquid crystal display device according to another embodiment of the present invention.

  As shown in FIG. 15, the liquid crystal display according to an embodiment of the present invention includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, a liquid crystal layer 3 sandwiched between the display panels 100 and 200, and A pair of polarizers 12 and 22 attached to the outer surfaces of the display panels 100 and 200 are provided.

  The layered structure of the display panels 100 and 200 according to the present embodiment is substantially the same as that shown in FIGS.

  For the thin film transistor array panel 100, a plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on a substrate 110. The gate line 121 includes a plurality of gate electrodes 124 and end portions 129, and the storage electrode line 131 includes a plurality of storage electrodes 133a to 133d and a plurality of connection portions 133e. On the gate line 121 and the storage electrode line 131, the gate insulating film 140, the plurality of linear semiconductors 151 including the protruding portions 154, the plurality of linear ohmic contact members 161 including the protruding portions 163, and the plurality of island-shaped ohmic contact members. 165 are sequentially formed. A plurality of data lines 171 including a source electrode 173 and an end 179, a plurality of drain electrodes 175, and a plurality of isolated metal pieces 178 are formed on the ohmic contact members 161 and 165 and the gate insulating film 140, and are protected thereon. A film 180 is formed. A plurality of contact holes 181, 182, 183 a, 183 b and 185 are formed in the protective film 180 and the gate insulating film 140. On the protective film 180, a plurality of pixel electrodes 191 having a cut-out portion 91-92b, a plurality of connection bridges 83, and a plurality of contact assistants 81, 82 are formed, and the alignment film 11 is formed thereon.

  For the common electrode panel 200, a light shielding member 220, an overcoat film 250, a common electrode 270 having an incision 71-72 b and an alignment film 21 are formed on the insulating substrate 210.

  However, unlike the liquid crystal display device shown in FIGS. 1 to 4, the common electrode panel 200 has no color filter, and instead, a plurality of color filters 230 are formed below the protective film 180 of the thin film transistor panel 100. Yes.

  The color filter 230 extends vertically in a strip shape along the column of the pixel electrodes 191, and the boundary between two adjacent color filters 230 coincides on the data line 171. However, the color filters 230 may be separated from each other or may overlap each other to serve as a light blocking member that prevents light leakage between the pixel electrodes 191. When the color filters 230 overlap each other, the light shielding member 220 on the common electrode display panel 200 may be omitted.

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

  The liquid crystal display device shown in FIG. 15 shares many features with the liquid crystal display device shown in FIGS.

  On the other hand, the characteristics of the embodiment of the present invention can be applied to a liquid crystal display device having a structure in which pixel electrodes are separated into two and different voltages are applied to each other.

  16 is a layout view of a liquid crystal display device according to another embodiment of the present invention, FIG. 17 is a layout view of a thin film transistor array panel for a thin film transistor display panel for the liquid crystal display device of FIG. 16, and FIG. FIG. 19 and FIG. 20 are sectional views taken along lines XIX-XIX and XX-XX, respectively, of the liquid crystal display device of FIG.

The liquid crystal display device according to the present embodiment includes a thin film transistor array panel 100, a common electrode panel 200, and a liquid crystal layer 3 sandwiched between the two display panels 100 and 200.
First, the thin film transistor array panel 100 will be described in detail with reference to FIGS. 16, 17, 19, and 20.

  A plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on an insulating substrate 110 made of transparent glass or plastic.

  The gate line 121 transmits a gate signal and extends mainly in the horizontal direction in the figure. Each gate line 121 has a plurality of gate electrodes 124 protruding downward and a wide end portion 129 for connection to another layer or an external driving circuit. The storage electrode line 131 is applied with a predetermined voltage and has a trunk line extending substantially parallel to the gate line 121, and a plurality of first, second, third, and fourth storage electrodes 133a, 133b, 133c, and 133d separated therefrom. A group and a plurality of connecting portions 133e are included. Each storage electrode line 131 is located between two adjacent gate lines 121, and the trunk line is close to the upper side of the two gate lines 121.

  The first and second sustain electrodes 133a and 133b extend in the vertical direction of the drawing and face each other. The first sustain electrode 133a has a fixed end connected to the main line and a free end in the opposite direction, and the free end includes a protrusion. The third and fourth sustain electrodes 133c and 133d extend obliquely from the center of the first sustain electrode 133a to the lower end and the upper end of the second sustain electrode 133b. The connection portion 133e is connected between adjacent sustain electrodes 133a-133d. However, the shape and arrangement of the storage electrode line 131 can be modified into various forms.

  The 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 80 °.

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

  On the gate insulating film 140, a plurality of linear semiconductors 151 made of hydrogenated amorphous silicon or polycrystalline silicon are formed. The linear semiconductor 151 extends mainly in the vertical direction of the drawing, and includes a plurality of protrusions 154 extending toward the gate electrode 124. The linear semiconductor 151 is wide in the vicinity of the gate line 121 and the storage electrode line 131 and covers these widely.

  A plurality of linear and island-shaped ohmic contact members 161 and 165 are formed on the semiconductor 151. The ohmic contact members 161 and 165 are preferably made of silicide composed of a material such as n + hydrogenated amorphous silicon doped with an n-type impurity such as phosphorus at a high concentration. The linear ohmic contact member 161 has a plurality of protrusions 163, and the protrusions 163 and the island-like ohmic contact member 165 form a pair and are disposed on the protrusions 154 of the semiconductor 151.

  The side surfaces of the semiconductor 151 and the ohmic contact members 161 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, a plurality of drain electrodes 175, and a plurality of isolated metal pieces 178 are formed on the ohmic contact members 161 and 165 and the gate insulating film 140.

  The data line 171 transmits a data voltage, and extends mainly in the vertical direction of the figure, and intersects the gate line 121, the main line of the storage electrode line 131, and the connection portion 133e. Each data line 171 extends toward the gate electrode 124 and has a plurality of source electrodes 173 bent in a C shape and a wide end 179 for connection to another layer or an external driving circuit. The drain electrode 175 is separated from the data line 171 and includes a rod-shaped portion facing the source electrode 173 with the gate electrode 124 as a center, and a capacitive coupling electrode 176 extending from the rod-shaped portion. The rod-shaped portion of each drain electrode 175 is partially surrounded by the source electrode 173, the capacitive coupling electrode 176 is connected to each other, and two hatched portions 176a and 176b parallel to the third and fourth sustain electrodes 133c and 133d, respectively. Have

  The metal piece 178 is located on the gate line 121 near the first sustain electrode 133a.

  Further, it is desirable that the side surfaces of the data line 171, the drain electrode 175, and the metal piece 178 are inclined at an angle of about 30 ° to 80 ° with respect to the surface of the substrate 110.

  The ohmic contact members 161 and 165 exist only between the semiconductor 151 thereunder and the data line 171 and drain electrode 175 thereabove, and lower the contact resistance therebetween. In most places, the linear semiconductor 151 is narrower than the data line 171, but as already described, the width is wide at the portion where the gate line 121 intersects, and the data line 171 is formed gently by forming a stepped shape on the surface. Prevents disconnection. The semiconductor 151 has an exposed portion that is not covered with the data line 171 and the drain electrode 175, such as between the source electrode 173 and the drain electrode 175.

  A protective film 180 is formed on the data line 171, the drain electrode 175, the metal piece 178, and the exposed semiconductor 151 portion. The protective film 180 is made of an inorganic insulator or an organic insulator, and the surface can be planarized. A plurality of contact holes 182 and 185 exposing the end 179 of the data line 171 and the drain electrode 175 are formed in the protective film 180, and the end 129 of the gate line 121 is exposed in the protective film 180 and the gate insulating film 140. A plurality of contact holes 181 to be exposed, a plurality of contact holes 183a exposing a protruding portion of the free end of the first sustain electrode 133a, and a plurality of portions exposing a part of the storage electrode line 131 near the fixed end of the first sustain electrode 133a. The contact hole 183b is formed. The contact holes 181, 182, 183 a, 183 b, and 185 can have various shapes such as a polygon or a circle. The side walls of the contact holes 181, 182, 183 a, 183 b, and 185 are preferably inclined at an angle of 30 ° to 85 ° or stepped.

  A plurality of pixel electrodes 191 including first and second subpixel electrodes 191 a and 191 b, a plurality of connection bridges 83, and a plurality of contact assisting members 81 and 82 are formed on the protective film 180. These are preferably 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 first subpixel electrode 191 a 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 first sub-pixel electrode 191a and the second sub-pixel electrode 191b are separated from each other with a gap 92 therebetween. The gap 92 is an oblique portion extending obliquely from the left side to the right side, and a vertical portion connecting the oblique portions. Have The hatched portion forms an angle of about 45 ° with respect to the gate line 121.

  Of the subpixel electrodes 191a and 191b divided by the gap 92, the first subpixel electrode 191a is located at the upper and lower portions around the second subpixel electrode 191b, surrounds the second subpixel electrode 191b, and The subpixel electrode 191b is sandwiched between two portions of the first subpixel electrode 191a. The first subpixel electrode 191a and the second subpixel electrode 191b face each other, have sides inclined by 45 ° with respect to the gate line 121, and have an inverted symmetrical structure with respect to the virtual lateral center line of the pixel electrode 191. Have

  The second subpixel electrode 191b has a central cutout 91, which extends along the horizontal center line and has an entrance on the right side. The entrance of the central incision 91 has a pair of hypotenuses parallel to the gap 92.

  Here, each of the first subpixel electrodes 191a is connected to the drain electrode 175 through the contact hole 185, and receives a data voltage directly from the first subpixel electrode 191a, whereas the second subpixel electrode 191b has the first pixel electrode 191a. It overlaps with the capacitive coupling electrode 176 connected to. Therefore, the second pixel electrode 191b is electromagnetically coupled (capacitive) to the first pixel electrode 191a.

  The pixel electrode 191 is divided into four regions by the gap 92 and the central cutout 91.

  As shown in FIGS. 5 and 16, each pixel electrode 191 has a pair of first main sides 193 and 194 facing each other and a pair of second main sides 195 and 196 connected thereto. The first main sides 193 and 194 are substantially parallel to the gate line 121, the second main sides 195 and 196 have inner and outer envelopes substantially parallel to the data line 171, and the first main sides 193 and 194 The envelope inside or outside the second main sides 195 and 196 is generally rectangular. The left corner of the pixel electrode 191 is chamfered to form oblique sides 193 c and 194 c, and the chamfered oblique sides 193 c and 194 c form about 45 ° with respect to the gate line 121.

  The second main sides 195 and 196 of the pixel electrode 191 have a plurality of vertical line segments 915 and 925 positioned on the inner envelopes 951 and 961, and a plurality of saw-shaped portions 910 and 920 projecting outward therefrom. The pixel electrode 191 is substantially symmetric with respect to the horizontal center line.

  Each saw-like portion 910, 920 has first oblique sides 911, 921 and second oblique sides 912, 922 facing each other, and upper sides 913, 923 that connect them and lie on outer envelopes 952, 962. The first hypotenuses 911 and 921 intersect the vertical line segments 915 and 925 with an obtuse angle greater than about 135 °, and the second hypotenuses 912 and 922 form an angle of about 45 ° with the vertical line segments 915 and 925. The extension lines of 911, 921 and the second hypotenuse 912, 922 intersect each other with an acute angle smaller than about 45 °. Also, the second hypotenuses 912 and 922 are substantially parallel to the gap 92 and on the extension of the gap 92, and the first hypotenuses 911 and 921 form an angle with the gap 92 that is less than about 45 ° or greater than 135 °. .

  The upper portions of the saw-shaped portions 910 and 920, that is, the vicinity of the upper sides 913 and 923 overlap with the data line 171 and are positioned on the right side and the saw-shaped portion 920 of the right side 196 of the pixel electrode 191 located on the left side around the data line 171. The saw-toothed portion 910 of the pixel electrode 191 is arranged so as to be engaged. The opposing sides of the saw-like portions 910 and 920 that mesh with each other are parallel to each other.

  The number of saw-like portions 910 and 920 is closely related to the number of pixel electrode 191 regions or the number of cut-out portions divided by the incisions and the gaps 91 and 92, and the number of pixel electrode 191 regions and the saw-like portions 910 are determined. , 920 differs depending on the design factors such as the size of the pixel electrode 191, the ratio of the length of the horizontal and vertical sides of the pixel electrode 191, the type and characteristics of the liquid crystal layer 3.

  Further, the pixel electrode 191 can overlap with the adjacent gate line 121 or the data line 171 to improve the aperture ratio.

  The connection bridge 83 crosses the gate line 121 and connects the exposed portion of the storage electrode line 131 and the free end of the first storage electrode 133a via contact holes 183a and 183b located on the opposite side with the gate line 121 interposed therebetween. Connected to exposed end. The storage electrode lines 131 including the storage electrodes 133a and 133b can be used together with the connection bridge 83 to repair defects in the gate lines 121, the data lines 171, or the thin film transistors.

  The contact assistants 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 contact holes 181 and 182, respectively.

  Hereinafter, the common electrode panel 200 will be described with reference to FIGS. 16, 18, 19, and 20.

  A light shielding member 220 is formed on an insulating substrate 210 made of transparent glass or plastic. The light shielding member 220 faces the pixel electrode 191 and has a plurality of substantially rectangular openings 225. The width of the portion 221 corresponding to the data line 171 of the light shielding member 220 is substantially the same as the width of the data line 171 (however, an alignment error between the display panels 100 and 200 can be taken into consideration). And has an extension 222 that blocks the space between the mating saw-like portions 910 and 920 projecting. It is desirable that the light shielding member 220 further includes a portion corresponding to the thin film transistor.

  A plurality of color filters 230 are formed on the substrate 210. It is desirable that the color filter 230 exists mostly in the region surrounded by the light shielding member 230 and extends long in the vertical direction along the column of the pixel electrodes 191. Each color filter 230 can display one of the basic colors such as the three primary colors of red, green, and blue.

  An overcoat film 250 is formed on the color filter 230 and the light shielding member 220. The overcoat film 250 is preferably made of an (organic) insulator, and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat film 250 can be omitted.

  A common electrode 270 is formed on the overcoat film 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO, and the common electrode 270 is formed with a plurality of incisions 71, 72a, 72b.

  The common electrode 270 has a plurality of sets of incisions 71, 72a, 72b.

  One incision 71-72b group faces one pixel electrode 191, and includes a central incision 71, a lower incision 72a, and an upper incision 72b. Each of the incisions 71-72b is disposed between adjacent incisions 91-92b of the pixel electrode 191 or between the incisions 92a, 92b and the chamfered oblique sides of the pixel electrode 191. Each incision 71-72b extends substantially parallel to the lower incision 92a or the upper incision 92b of the pixel electrode 191, and has at least one hatched portion. The cut-out portions 71-72b are almost inverted and symmetric with respect to the horizontal center line of the pixel electrode 191.

  Each of the lower and upper cutouts 72a and 72b includes a hatched portion and a lateral portion. The hatched portion extends from the upper side or the lower side of the pixel electrode 191 to the left side, and overlaps with the vertical side of the pixel electrode 191. The opposing long sides of the shaded portion substantially intersect with or are located on the first and second oblique sides 911, 912, 921, 922 of the sawtooth portion of the pixel electrode 191 or their extension lines. The horizontal portion extends from each end of the shaded portion along the horizontal side of the pixel electrode 191 while overlapping the horizontal side, and forms an obtuse angle with the shaded portion.

  The central incision 71 includes a central lateral portion and a pair of hatched portions. The central horizontal portion extends from the left side of the pixel electrode 191 to the right along the horizontal center line of the pixel electrode 191. The pair of shaded portions extend substantially parallel to the lower and upper cutouts 72a and 72b, respectively, while forming an obtuse angle with the central horizontal portion from the end of the central horizontal portion toward the right side of the pixel electrode 191.

  Further, the number of the incisions 71-72b varies depending on the design element, and the light shielding member 220 can be overlapped with the incisions 71-72b to block light leakage near the incisions 71-72b.

  An interval material (not shown) made of an insulating material is formed on the common electrode 270 to maintain a constant interval between the two display panels 100 and 200.

  The light shielding member 220 can overlap the incisions 71, 72a, 72b and block light leakage near the incisions 71, 72a, 72b. In the present embodiment, the hatched portions 176a and 176b of the capacitive coupling electrode 176 overlap with the incisions 71, 72a and 72b to block light leakage near the incisions 71, 72a and 72b.

  At this time, the inclination angle of the saw-like portions 910 and 920 of the pixel electrode 191 may be formed to be 1 ° to 15 ° larger than the inclination angle of the hatched portion of the central cutout portion 71 of the common electrode 270. Vertical alignment films 11 and 21 are applied to the inner side surfaces of the display panels 100 and 200, respectively, and polarizers 12 and 22 are disposed on the outer side surfaces.

  When a common voltage is applied to the common electrode 270 and a data voltage is applied to the pixel electrode 191, an electric field substantially perpendicular to the surface of the display panel is generated. In response to the electric field, the liquid crystal molecules 310 try to change direction so that the major axis is perpendicular to the direction of the electric field. On the other hand, the cut portions 71, 72a, 72b, 91, 92a, 92b of the common electrode 270 and the pixel electrode 191 and the hypotenuse of the pixel electrode 191a form a horizontal component that distorts the electric field and determines the tilt direction of the liquid crystal molecules. The horizontal component of the electric field is perpendicular to the sides of the incisions 71, 72a, 72b, 91, 92a, 92b and the oblique sides of the pixel electrode 191a. Further, the horizontal components of the main electric fields on the two opposing sides of the incisions 71, 72a, 72b, 91, 92a, and 92b are opposite to each other.

  Through such an electric field, the incisions 71, 72a, 72b, 91, 92a, and 92b control the direction in which the liquid crystal molecules of the liquid crystal layer 3 are tilted. Liquid crystal molecules in each domain defined by adjacent cutouts 71, 72a, 72b, 91, 92a, 92b or defined by right and left oblique sides of cutouts 72a, 72b and subpixel electrodes 191a, 191b Is inclined in a direction perpendicular to the length direction of the incisions 71, 72a, 72b, 91, 92a, 92b. The two longest sides of each domain are substantially parallel and form approximately 45 ° with the gate line 121, and most of the liquid crystal molecules in the domain tilt in four directions, thereby expanding the viewing angle.

  Further, when the side adjacent to the data line 171 among the sides of the pixel electrodes 191a and 191b is formed in a saw-tooth shape, as described in the above-described embodiment with reference to FIGS. The sub-electric field formed in can enhance the alignment of the liquid crystal in the sub-region.

  The incisions 71, 72a, 72b, 91, 92a, 92b preferably have a width of about 9 μm to about 12 μm.

  At least one incision 71, 72a, 72b, 91, 92a, 92b may be replaced by a protrusion (not shown) or a depression (not shown). The protrusion is preferably made of an organic material or an inorganic material, and may be disposed above or below the electric field generating electrodes 191a, 191b, 270, and preferably has a width of about 5 μm to about 10 μm.

  On the other hand, the highest luminance is obtained when the tilt direction of the liquid crystal molecules 31 and the transmission axes of the polarizers 12 and 22 form 45 °. In this embodiment, the tilt directions of the liquid crystal molecules 31 of all domains are 45 ° with the gate lines 121. None, the gate line 121 is vertical or horizontal with the peripheral edge of the display panels 100 and 200. Therefore, in this embodiment, when the transmission axes of the polarizers 12 and 22 are attached so as to be perpendicular or parallel to the peripheral edges of the display plates 100 and 200, the maximum luminance is obtained and the polarizers 12 and 22 are manufactured at low cost. can do.

  In the liquid crystal display device according to the embodiment of the present invention, as described above, the second subpixel electrode 191b is electromagnetically coupled (capacitively coupled) to the first subpixel electrode 191a. The first pixel electrode 191a is directly connected to the thin film transistor (Q) through the drain electrode 175 and receives an image signal voltage transmitted through the data line 171 by the thin film transistor, whereas the voltage of the second sub pixel electrode 191b is the second voltage. The capacitive coupling with the one subpixel electrode 191a is changed. In this embodiment, the voltage of the second subpixel electrode 191b is always lower in absolute value than the voltage of the first subpixel electrode 191a.

  Such a capacitive coupling structure desirably has the following structure.

  21 is a layout view of a liquid crystal display device according to another embodiment of the present invention, FIG. 22 is a cross-sectional view of the liquid crystal display device of FIG. 21, taken along line XXII-XXII, and FIG. 2 is a schematic equivalent circuit diagram for one pixel of the liquid crystal display device shown in FIG.

  As shown in FIGS. 21 to 24, a liquid crystal display according to an embodiment of the present invention includes a thin film transistor array panel 100, a common electrode display panel 200, and a liquid crystal layer sandwiched between the two display panels 100 and 200. 3 is provided.

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

  A plurality of gate conductors having a plurality of gate lines 121, a plurality of storage electrode lines 131, and a plurality of capacitor electrodes 136 are formed on an insulating substrate 110 made of transparent glass or plastic.

  The gate line 121 transmits a gate signal and extends mainly in the horizontal direction of FIG. Each gate line 121 has a plurality of gate electrodes 124 protruding upward and an end portion 129 having a large area for connection to another layer or an external driving circuit. The storage electrode line 131 is applied with a predetermined voltage and includes lower and upper trunk lines 131 a 1 and 131 a 2 that extend substantially parallel to the gate line 121. Each storage electrode line 131 is located between two adjacent gate lines 121, the lower trunk line 131a1 is closer to the lower side of the two gate lines 121, and the upper trunk line 131a2 is closer to the upper side. The lower and upper trunk lines 131a1 and 131a2 include lower and upper sustain electrodes 137a1 and 137a2 extending downward and upward, respectively.

  The capacitor electrode 136 has a rectangular shape that is long in the horizontal direction, and is separated from the gate line 121 and the storage electrode line 131. The capacitor electrode 136 is positioned between the pair of lower and upper sustain electrodes 137a1 and 137a2, and is disposed at substantially the same distance as the two sustain electrodes 137a1 and 137a2, and is also approximately the same distance between the two adjacent gate lines 121. Is placed. However, the shape and arrangement of the storage electrode line 131 can be modified into various forms.

  The side surfaces of the gate conductors 121, 131, and 136 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 film 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate conductors 121, 131, and 136.

  A plurality of island-shaped semiconductors 154 made of hydrogenated amorphous silicon (amorphous silicon is abbreviated as a-Si) or polycrystalline silicon are formed on the gate insulating film 140. The semiconductor 154 is located on the gate electrode 124 and has an extension that covers the boundary of the gate line 121. Further, a separate island semiconductor that covers the boundary of the storage electrode line 131 may be formed.

  A plurality of island-shaped ohmic contact members 163 and 165 are formed on the semiconductor 154. The ohmic contact members 163 and 165 are preferably made of a material such as n + hydrogenated amorphous silicon doped with an n-type impurity such as phosphorus at a high concentration, or made of silicide. The ohmic contact members 163 and 165 are disposed on the semiconductor 154 in a pair.

  The side surfaces of the semiconductor 154 and the ohmic contact members 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 data conductor including a plurality of data lines 171 and a plurality of drain electrodes 175 is formed on the ohmic contacts 163 and 165 and the gate insulating film 140.

  The data line 171 transmits a data signal and extends mainly in the vertical direction of FIG. 21 and intersects the gate line 121 and the storage electrode line 131. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124 and an end portion 179 having a large area for connection to another layer or an external driving circuit. The drain electrode 175 is separated from the data line 171 and includes a rod-shaped end portion facing the source electrode 173 around the gate electrode 124. The rod-shaped end portion is partially surrounded by a source electrode 173 bent in a U shape.

  Each drain electrode 175 includes a lower portion, an upper portion, and a central extension portion 177a1, 177a2, 176, and a pair of connection portions 178a1, 178a2 connecting them. The extended portions 177a1, 177a2, 176 are rectangular in the horizontal direction, and the connecting portions 178a1, 178a2 are connected to each other on both sides of the extended portions 177a1, 177a2, 176, and are substantially parallel to the data line 171.

  The lower and upper extensions 177a1 and 177a2 overlap with the lower and upper sustain electrodes 137a1 and 137a2, respectively.

  The central extension 176 overlaps with the capacitive electrode 136, and the central extension 176 is hereinafter referred to as a coupling electrode. A contact hole 176H is formed near the right end of the coupling electrode 176. The coupling electrode 176 is manufactured in substantially the same shape as the capacitor electrode 136.

  The data conductors 171, 175, and 176 preferably have side surfaces inclined at an angle of about 30 ° to 80 ° with respect to the surface of the substrate 110.

  The ohmic contact members 163 and 165 exist only between the underlying semiconductor 154 and the upper data conductors 171 and 175, and lower the contact resistance between them. An extension of the semiconductor 154 located on the gate line 121 prevents the data line 171 from being disconnected by gently forming a stepped shape on the surface. The semiconductor 154 has substantially the same planar shape as the data line 171, the drain electrode 175, and the ohmic contact members 161 and 165 therebelow. However, the semiconductor 154 has an exposed portion that is not covered with the data conductors 171 and 175, such as between the source electrode 173 and the drain electrode 175.

  A protective film 180 is formed on the data conductors 171 and 175 and the exposed semiconductor 154 portion. The protective film 180 is made of an inorganic insulator or an organic insulator, and the surface can be planarized. A plurality of contact holes 182 exposing the end portions 179 of the data lines 171 and a plurality of contact holes 185a1 and 185a2 exposing the lower and upper extension portions 177a1 and 177a2 of the drain electrode 175 are formed in the protective film 180. In the protective film 180 and the gate insulating film 140, a plurality of contact holes 181 exposing the end portions 129 of the gate lines 121 and a plurality of contact holes 186 exposing the capacitor electrodes 136 through the contact holes 176H of the coupling electrode 176 are formed. Has been.

  A plurality of pixel electrodes 191 and a plurality of contact assisting members 81 and 82 are formed on the protective film 180. These are preferably made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

  Each pixel electrode 191 is connected to a pair of first main sides 193 and 194 facing each other and the first main sides 193 and 194, and connects between the plurality of saw-like portions 90 and the saw-like portions 90. The second main side includes the bottom side 90c. The saw-shaped portion 90 has a first oblique side 90a and a second oblique side 90d inclined with respect to the first main sides 193 and 194, and an upper side 90b connecting the first oblique side 90a and the second oblique side 90d. The first main sides 193 and 194 are parallel to the gate line 121. The first main sides 193 and 194 and the second main side are substantially rectangular, and the four corners of the pixel electrode 191 are chamfered to form an angle of about 45 ° with the gate line 121. The first oblique side 90a partially overlaps with the data line 171. The first oblique sides 90a of the two adjacent pixel electrodes 191 face each other and are parallel to each other.

  Each pixel electrode 191 includes a lower, upper, and center subpixel electrodes 191a1, 191a2, 191b that are divided with a lower and upper gaps 93a, 93b interposed therebetween. The lower and upper gaps 93a and 93b extend obliquely from the left side of the pixel electrode 191 to the right side, so that the central subpixel electrode 191b has an isosceles trapezoid rotated by about 90 °. The subpixel electrodes 191a1 and 191a2 are right triangles rotated by approximately 90 °. The lower and upper gaps 93a and 93b form an angle of about 45 ° with respect to the gate line 121 and are perpendicular to each other.

  The lower and upper subpixel electrodes 191a1 and 191a2 are connected to the lower and upper extensions 177a1 and 177a2 of the drain electrode 175 through contact holes 185a1 and 185a2, respectively.

  The central subpixel electrode 191 b is connected to the capacitor electrode 136 through the contact hole 186 and overlaps with the coupling electrode 176. The central subpixel electrode 191b and the capacitor electrode 136 together with the coupling electrode 176 form a coupling capacitor.

  A central incision 91 and first upper and lower oblique incisions 92a and 92b are formed in the central subpixel electrode 191b, and a second lower oblique incision 94a is formed in the lower subpixel electrode 191a1 and the upper subpixel electrode 191a2. Is formed with a second upper oblique incision 94b. The incisions 91, 92a, 92b, 94a, 94b partition the subpixel electrodes 191b, 191a1, 191a2 into a plurality of subregions. The pixel electrode 191 including the cutout portions 91, 92 a, 92 b, 94 a, 94 b and the gaps 93 a, 93 b (hereinafter, the gap is also referred to as the cutout portion) is almost inversion symmetric with respect to the capacitor electrode 136.

  The lower and upper oblique cutout portions 92a to 94b extend obliquely from the left corner, the lower side, or the upper side of the pixel electrode 191 to the right side. The lower and upper oblique cutouts 92a to 94b form an angle of about 45 ° with respect to the gate line 121 and extend perpendicular to each other. The lower and upper oblique cutouts 92a, 92b, 94a, 94b preferably have entrances on the left side or right side of the pixel electrode 191, and the entrances are preferably connected to the recesses 90c.

  The first oblique side 90a forming the saw-like portion 90 of the second main side forms an obtuse angle with the oblique line incisions 92a to 94a of the pixel electrode 191, and the second oblique side 90d is substantially parallel to the oblique line incisions 92a to 94b.

  The central incision 91 extends along the storage electrode line 131 and has an entrance on the left side. The entrance of the central incision 91 has a pair of hypotenuses substantially parallel to the lower incisions 92a to 94a and the upper incisions 92b to 94b.

  At this time, the number of incisions or the number of regions are the size of the pixel electrodes 191a1, 191a2, 191b, the ratio of the lengths of the horizontal and vertical sides of the pixel electrodes 191a1, 191a2, 191b, the type and characteristics of the liquid crystal layer 3. It depends on the design element.

  The contact assistants 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 contact holes 181 and 182, respectively.

  Hereinafter, the common electrode panel 200 will be described.

  A light shielding member 220 is formed on an insulating substrate 210 made of transparent glass or plastic. The light blocking member 220 includes a linear portion 221 corresponding to the data line 171, a partially expanded portion 222 and a planar portion 223 corresponding to the thin film transistor, and prevents light leakage between the pixel electrodes 191. Define the opening area opposite to. However, it is desirable that the light shielding member 220 has a plurality of openings (not shown) facing the pixel electrode 191 and having substantially the same shape as the pixel electrode 191.

  A plurality of color filters 230 are formed on the substrate 210. It is desirable that the color filter 230 exists mostly in a region surrounded by the light shielding member 230 and extends long in the vertical direction along the column of the pixel electrodes 191. Each color filter 230 can display one of the basic colors such as the three primary colors of red, green, and blue.

  An overcoat film 250 is formed on the color filter 230 and the light shielding member 220. The overcoat film 250 is preferably made of an (organic) insulator, and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat film 250 may be omitted.

  A common electrode 270 is formed on the overcoat film 250.

  A plurality of incisions 71, 72a, 72b, 73a, 73b, 74a, 74b, 75 are formed in the common electrode 270.

  One incision group 71 to 75 faces one pixel electrode 191, and includes a central incision 71, first to third lower oblique incisions 72a, 73a and 74a, and first to third upper oblique incisions 72b and 73b. 74b and connecting portion 75. Each of the incisions 71 to 74b is between the adjacent incisions 91, 92, 93a, 93b, 94a, 94b, 95a, and 95b of the pixel electrode 191 or between the incisions 91, 92, 93a, 93b, 94a, 94b, 95a, and 95b. The pixel electrode 191 is disposed between the chamfered oblique sides. Each of the incisions 71 to 74b includes at least one hatched portion extending in parallel to the lower incisions 93a, 94a, and 95a of the pixel electrode 191 or the upper incisions 93b, 94b, and 95b.

  The first lower and first upper oblique cutouts 72a and 72b extend substantially from the right side of the pixel electrode 191 to the left side of the pixel electrode 191, and the second lower and second upper oblique cutouts 73a and 73b are the pixel electrode. The pixel electrode 191 extends from the right side of 191 to the upper left corner or the lower left corner. The third lower and third upper oblique incisions 74a and 74b extend from the right side of the pixel electrode 191 to the upper side or lower side of the pixel electrode 191, and the third lower and third upper oblique incision 74a. , 74b, and a vertical horizontal portion extending while overlapping each other along the lower side and the upper side of the pixel electrode 191. The vertical transverse part forms an obtuse angle with the oblique line incisions 74a and 74b.

  The central incision 71 includes a central lateral portion and a pair of hatched portions. The central horizontal portion extends from the right side of the pixel electrode 191 to the left along the storage electrode line 131, and the pair of hatched portions are the lower and upper diagonal lines from the end of the central horizontal portion toward the left side of the pixel electrode 191, respectively. It extends substantially parallel to the incisions 72a-74b.

  One end of the second lower cutout 73a of the pixel electrode adjacent to one end of the hatched portion of the central cutout 71, and the second upper cutout 73b of the pixel electrode adjacent to one end of the other hatched portion of the central cutout 71. One end, one end of the third lower oblique cutout portion 74a of the pixel electrode adjacent to one end of the first lower oblique cutout portion 72a, and the third upper oblique cutout portion 74b of the pixel electrode adjacent to one end of the first upper oblique cutout portion 72b. One end of each is connected to the connecting portion 75. The connecting portion 75 is parallel to the first oblique side 90 a of the pixel electrode 191 and is located at a portion corresponding to the data line 171. The width of the connecting portion 75 is preferably about 8 μm wider than the interval between the pixel electrode 191 and the pixel electrode 191, and the extended portion 222 of the light shielding member 220 preferably corresponds to the connecting portion 75 and is wider than the other portions.

  Each incision 71-74b is formed with a plurality of recessed notches 7 regularly arranged at a certain distance.

  Alignment films 11 and 21 are applied to the inner side surfaces of the display panels 100 and 200, and these may be vertical alignment films. The outer surfaces of the display panels 100 and 200 have polarizers (not shown). The polarization axes of the two polarizers are orthogonal to each other, and one of the polarization axes is parallel to the gate line 121. It is desirable to be. In the case of a reflective liquid crystal display device, one of the two polarizers may be omitted.

  The liquid crystal display device according to the present embodiment preferably further includes a phase retardation film (not shown) for compensating the delay value of the liquid crystal layer 3. The phase retardation film has birefringence and compensates for the phase retardation of the liquid crystal layer 3 in reverse.

  The liquid crystal display device preferably includes a polarizer, a phase retardation film, display panels 100 and 200, and an illumination unit (not shown) that supplies light to the liquid crystal layer 3.

  The liquid crystal layer 3 has a negative dielectric anisotropy, and the liquid crystal molecules of the liquid crystal layer 3 are aligned so that the major axis is perpendicular to the surfaces of the two display panels in the absence of an electric field. . For this reason, incident light cannot pass through the orthogonal polarizer and is blocked.

  In the liquid crystal display device shown in FIGS. 21 to 25, an opaque member such as the storage electrode line 131, the capacitor electrode 136, the extended portions 177a1, 177a2, 176 and the connecting portions 178a1, 178a2 of the drain electrode 175, and the cutout portions 91-94b. , 71-75, and transparent electrodes such as the pixel electrode 191 and the common electrode 270 are arranged symmetrically around the capacitor electrode 136 that is equidistant from the adjacent two gate lines 121. Such a liquid crystal display device will be described with reference to FIG.

As shown in FIG. 24, one pixel of the liquid crystal display device includes a first sub-pixel including a thin film transistor (Q), a first liquid crystal capacitor (C _LC a) and a storage capacitor (C _ST ), a second liquid crystal capacitor (C _LC). a second subpixel including b), and a coupling capacitor (Ccp).

The first liquid crystal capacitor (C _LC a) includes a lower subpixel electrode 191a1 and an upper subpixel electrode 191a2 as one terminal, and includes the portion of the common electrode 270 as another terminal, and the liquid crystal layer 3 between the two terminals. The portion is included as a dielectric. Similarly, the second liquid crystal capacitor (C _LC b) includes the central subpixel electrode 191b as one terminal, the corresponding portion of the common electrode 270 as the other terminal, and the liquid crystal layer 3 portion between the two terminals. Is included as a dielectric.

The storage capacitor (C _ST ) includes the lower and upper extensions 177a1 and 177a2 of the drain electrode 175 as one terminal, and the lower and upper sustain electrodes 137a1 and 137a2 as another terminal, and a gate insulating film between the two terminals. 140 parts are included as a dielectric. The coupling capacitor (Ccp) includes the central sub-pixel electrode 191b and the capacitor electrode 136 as one terminal, and includes the coupling electrode 176 as the other terminal. The protective film 180 and the gate insulating film 140 between the two terminals are dielectrics. Include as.

The first liquid crystal capacitor (C _LC a) and the storage capacitor (C _ST ) are connected to the drain of the thin film transistor (Q), and the coupling capacitor (Ccp) is connected to the thin film transistor (Q) and the second liquid crystal capacitor (C _LC b). Connected between. A common voltage (Vcom) is applied to the common electrode 270, and a common voltage (Vcom) can also be applied to the storage electrode line 131.

The thin film transistor (Q) applies the data voltage from the data line 171 to the first liquid crystal capacitor (C _LC a) and the coupling capacitor (Ccp) according to the gate signal from the gate line 121, and the coupling capacitor (Ccp) applies the voltage. The size is changed and transmitted to the second liquid crystal capacitor (C _LC b).

When a common voltage (Vcom) is applied to the storage electrode line 131 and the capacitors (C _LC a, C _ST , C _LC b, Ccp) and their capacitances are indicated by the same reference numerals, the first liquid crystal capacitor (C _LC a ) And the voltage (Vb) charged in the second liquid crystal capacitor (C _LC b) have the following relationship.

Vb = Va [Ccp / (Ccp + C _LC b)]
Since the value of Ccp / (Ccp + C _LC b) is smaller than 1, the voltage (Vb) charged in the second liquid crystal capacitor (C _LC b) is the voltage (Va) charged in the first liquid crystal capacitor (C _LC a). ) Always smaller. This relationship is similarly established when the voltage of the storage electrode line 131 is not the common voltage (Vcom).

As described above, when a potential difference is generated between both ends of the first or second liquid crystal capacitor (C _LC a, C _LC b), an electric field substantially perpendicular to the surfaces of the display panels 100 and 200 is generated in the liquid crystal layer 3. Then, the liquid crystal molecules of the liquid crystal layer 3 are inclined so that the major axis thereof is perpendicular to the direction of the electric field in response to the electric field, and the degree of change in the polarization of the light passing through the liquid crystal layer 3 varies depending on the degree of inclination of the liquid crystal molecules. . Such a change in polarization appears as a change in transmittance by the polarizers 12 and 22, whereby the liquid crystal display device displays an image.

The angle at which the liquid crystal molecules are tilted varies depending on the strength of the electric field, but the voltage (Va) of the first liquid crystal capacitor (C _LC a) and the voltage (V b) of the second liquid crystal capacitor (C _LC b) are different from each other. The angle at which the liquid crystal molecules tilt is different between the sub-pixel and the second sub-pixel, and therefore the luminance of the two sub-pixels is different. Accordingly, by appropriately matching the voltage (Va) of the first liquid crystal capacitor (C _LC a) and the voltage (Vb) of the second liquid crystal capacitor (C _LC b), the image viewed from the side is brought close to the image viewed from the front. As a result, side visibility can be improved.

The ratio between the voltage (Va) of the first liquid crystal capacitor (C _LC a) and the voltage (Vb) of the second liquid crystal capacitor (C _LC b) is adjusted by changing the capacitance of the coupling capacitor (Ccp), The capacitance of the coupling capacitor (Ccp) can be changed by adjusting the overlapping area and distance of the second subpixel electrode 191b, the capacitance electrode 136, and the coupling electrode 176. For example, when the capacitor electrode 136 is removed and the coupling electrode 176 is disposed at that position, the distance between the coupling electrode 176 and the second pixel electrode 191b can be increased. The second liquid crystal capacitor (C _LC b) voltage (Vb) is preferably 0.6 to 0.8 times the first liquid crystal capacitor (C _LC a) voltage (Va).

On the other hand, the voltage (Vb) of the second liquid crystal capacitor (C _LC b) may be higher than the voltage (Va) of the first liquid crystal capacitor (C _LC a). _This is possible by precharging _LC b) with a predetermined voltage such as a common voltage.

  The area ratio between the lower and upper pixel electrodes 191a1 and 191a2 of the first subpixel and the central pixel electrode 191b of the second subpixel is preferably in the range of 1: 0.85 to 1: 1.15. The number of subpixel electrodes may be changed.

  Further, by forming the side adjacent to the data line 171 among the sides of the pixel electrode 191 in the same shape as the saw-toothed portion 90, the sub-electric field formed between the adjacent pixel electrodes 191 is changed to the liquid crystal in the sub-region. It is formed in a direction to strengthen the orientation of Further, by providing the connection portion 75 at a position corresponding to the region where the first oblique sides 90a of the two adjacent pixel electrodes 191 face each other, the alignment of the liquid crystal in the sub region can be further enhanced.

  FIG. 25 is a layout view of a liquid crystal display device according to another embodiment of the present invention, FIG. 26 is a cross-sectional view of the liquid crystal display device of FIG. 25 taken along line XXVI-XXVI, and FIG. It is sectional drawing along the XXVII-XXVII line of the liquid crystal display device.

  As shown in FIGS. 25 to 27, a liquid crystal panel assembly according to an embodiment of the present invention includes a thin film transistor panel 100, a common electrode panel 200, and a liquid crystal sandwiched between the two display panels 100 and 200. Layer 3 is provided.

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

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

  The first and second gate lines 121a and 121b transmit gate signals and extend mainly in the horizontal direction, and are located above and below the storage electrode line 131, respectively.

  The first gate line 121a has a large area for connecting a plurality of first gate electrodes 124a projecting downward to another layer or an external driving circuit, and includes an end portion 129a disposed on the left side.

  The second gate line 121b has a large area for connection between the plurality of second gate electrodes 124b protruding upward and other layers or an external driving circuit, and includes an end portion 129b disposed on the left side.

  However, both of the end portions 129a and 129b can be arranged on the right side, or can be arranged on different sides. The storage electrode line 131 is applied with a predetermined voltage and extends mainly in the lateral direction of FIG. Each storage electrode line 131 is located between the first and second gate lines 121a and 121b, is closer to the first gate line 121a than the second gate line 121b, and is substantially the same as two adjacent second gate lines 121b. Put away. Each storage electrode line 131 includes a storage electrode 137 extended downward, and the storage electrode 137 is substantially rectangular and symmetrical to the storage electrode line 131. The shape and arrangement of the storage electrode line 131 including the storage electrode 137 can be modified into various forms.

  The 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 film 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate conductors 121a, 121b, and 131.

  A plurality of island-shaped semiconductors 154a, 154b, 156, 157a, and 157b made of hydrogenated amorphous silicon (amorphous silicon is abbreviated as a-Si) or polycrystalline silicon are formed on the gate insulating film 140. ing. The semiconductors 154a and 154b are located on the gate electrodes 124a and 124b, respectively. The semiconductor 156 covers the boundary of the storage electrode line 131. The semiconductors 157a and 157b partially overlap with the boundary line of the sustain electrode 137.

  A plurality of island-shaped ohmic contact members 163a, 163b, 165a, 165b, and 167b are formed on the semiconductors 154a, 154b, and 157b, and an island-shaped ohmic contact member (not shown) is also formed on the semiconductors 156 and 157a. Yes. The ohmic contact members 163a, 163b, 165a, 165b, and 167b are preferably made of a material such as n + hydrogenated amorphous silicon doped with an n-type impurity such as phosphorus at a high concentration, or made of silicide. The ohmic contact members 163a and 165a and the ohmic contact members 163b and 165b are disposed on the semiconductors 154a and 154b in pairs.

  The side surfaces of the semiconductors 154a, 154b, 156, 157a, 157b and the ohmic contact members 163a, 163b, 165a, 165b, 167b are inclined with respect to the surface of the substrate 110, and the inclination angle is about 30 ° to 80 °.

  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 contact members 163a, 163b, 165a, 165b, and 167b and the gate insulating film 140. .

  The data line 171 transmits a data signal and extends mainly in the vertical direction of FIG. 25 and intersects with the gate lines 121a and 121b and the storage electrode line 131. Each data line 171 has a large area for connecting a plurality of first and second source electrodes 173a, 173b extending toward the first and second gate electrodes 124a, 124b to another layer or an external driving circuit. Part 179.

  The first and second drain electrodes 175a and 175b are separated from each other and from the data line 171.

  The first drain electrode 175a has a rod-shaped end 176a facing the first source electrode 173a around the first gate electrode 124a, a wide rectangular-shaped extension 177a at the end opposite to the rod-shaped end 176a, and an extension It includes a linear connection portion 176aa that connects the end portion 176a and the end portion 176a. The extended portion 177a overlaps with the sustain electrode 137, and the rod-shaped end portion 176a is partially surrounded by the first source electrode 173a that overlaps with the first gate electrode 124a and is bent in a U shape. The connection part 176aa of the first drain electrode 175a is mostly located on the extension part 139, extends parallel to the extension part 139, and is located within the vertical boundary line of the extension part 139.

  Similarly, the second drain electrode 175b has a rod-shaped end 176b facing the second source electrode 173b with the second gate electrode 124b as the center, and a wide rectangular extension 177b at the end opposite to the rod-shaped end 176b. In addition, a linear connection portion 176bb that connects the extended portion 177b and the end portion 176b is included. The extended portion 177b overlaps with the sustain electrode 137, and the rod-shaped end portion 176b overlaps with the second gate electrode 124b and is partially surrounded by the second source electrode 173b bent in a U shape. The area of the extended portion 177b of the second drain electrode 175b is smaller than the area of the extended portion 177a of the first drain electrode.

  As described above, since the extension portion 139 can be provided under the connection portion 176aa of the first drain electrode 175a to increase the storage capacitance, the area of the sustain electrode 137 can be reduced and the aperture ratio can be improved.

  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 first and second together with the first and second semiconductors 154a and 154b. A thin film transistor (Qa, Qb) is configured, and a channel of the first and second thin film transistors (Qa, Qb) is a first between the first and second source electrodes 173a, 173b and the first and second drain electrodes 175a, 175b. The second semiconductors 154a and 154b are formed.

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

  The ohmic contact members 163a, 163b, 165a, 165b, and 167b exist only between the underlying semiconductors 154a, 154b, and 157b and the data conductors 171, 175a, and 175b thereabove, and lower the contact resistance between them. . The semiconductors 156, 157a, and 157b located on the gate lines 121a and 121b and the storage electrode line 131 prevent the disconnection of the data line 171 and the drain electrodes 175a and 175b by forming the surface step shape gently. The island-shaped semiconductors 154a and 154b have portions exposed without being covered with the data conductors 171, 175a and 175b, such as between the source electrodes 173a and 173b and the drain electrodes 175a and 175b.

  A protective film 180 is formed on the data conductors 171, 175a, 175b and the exposed semiconductors 154a, 154b. The protective film 180 is made of an inorganic insulator or an organic insulator, and the surface can be planarized. A plurality of contact holes 182, 185 a, and 185 b are formed in the protective film 180 to expose the end portion 179 of the data line 171 and the extended portions 177 a and 177 b of the first and second drain electrodes 175 a and 175 b, respectively. In the gate insulating film 140, a plurality of contact holes 181a and 181b exposing the end portions 129a and 129b of the gate lines 121a and 121b are formed.

  A plurality of pixel electrodes 191 including a first subpixel electrode 191a and a second subpixel electrode 191b and a plurality of contact assistants 81a, 81b, 82 are formed on the protective film 180. These are preferably made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

  Each pixel electrode 191 has a substantially quadrangular shape with four corners chamfered, and the chamfered hypotenuse forms an angle of about 45 ° with respect to the gate lines 121a and 121b.

  A pair of first and second subpixel electrodes 191a and 191b constituting each pixel electrode 191 are in mesh with each other with a gap 92 and 93 therebetween. The second subpixel electrode 191b has a substantially rotated isosceles trapezoidal shape, the bottom is recessed in a trapezoidal shape, and most of the second subpixel electrode 191b is surrounded by the first subpixel electrode 191a. The first subpixel electrode 191a includes an upper part, a lower part, and a central trapezoid part connected to each other on the left side.

  Each pixel electrode 191 is connected to a pair of first main sides 193, 194 facing each other and the first main sides 193, 194, and a plurality of saw-shaped portions 90 are connected to the bases connecting the saw-shaped portions 90. A second main side including 90c. The saw-shaped portion 90 has a first hypotenuse 90a and a second hypotenuse 90d inclined with respect to the first main sides 193 and 194, and an upper side 90b connecting the first hypotenuse 90a and the second hypotenuse 90d. The first main sides 193 and 194 are parallel to the gate line 121. The first main sides 193 and 194 and the second main side are substantially rectangular, and the four corners of the pixel electrode 191 are chamfered to form an angle of about 45 ° with the gate line 121. The first oblique side 90a partially overlaps with the data line 171. The first oblique sides 90a of two adjacent pixel electrodes 191 face each other and are parallel to each other.

  The first subpixel electrode 191a includes cutouts 94a and 94b extending from the upper side of the upper trapezoidal part and the lower side of the lower trapezoidal part toward the right side. The central trapezoidal portion of the first subpixel electrode 191a is sandwiched between the concave bottom sides of the second subpixel electrode 191b. The first subpixel electrode 191a has a central cutout 91 including a horizontal portion and a pair of shaded portions connected to the horizontal portion. The horizontal portion extends shortly along the horizontal center line of the first subpixel electrode 191 a, and the pair of shaded portions extend from the horizontal portion toward the left side of the first subpixel electrode 191 a, and is connected to the storage electrode line 131. It makes an angle of about 45 ° with respect to it. The gaps 92 and 93 between the first subpixel electrode 191a and the second subpixel electrode 191b include two pairs of upper and lower hatched portions and vertical portions that form about 45 ° with the gate lines 121a and 121b. In the following description, the gaps 92 and 93 are also referred to as incisions. The cutouts 91-94b are substantially inversion symmetric with respect to the storage electrode line 131, and they form an angle of about 45 ° with respect to the gate lines 121a, 121b and extend perpendicular to each other. The pixel electrode 191 is divided into a plurality of regions by the incisions 91-94b.

  Accordingly, the upper half and the lower half around the storage electrode line 131 that bisects the pixel electrode 191 in the horizontal direction are each divided into four regions by the cutout portions 91-94b.

  At this time, the number of regions or the number of incisions varies depending on design factors such as the size of the pixel electrode 191, the ratio of the length of the horizontal and vertical sides of the pixel electrode 191, and the type and characteristics of the liquid crystal layer 3.

  The first and second subpixel electrodes 191a and 191b are connected to the first and second drain electrodes 175a and 175b through the contact holes 185a and 185b, respectively. The data voltage is supplied from the first and second drain electrodes 175a and 175b. Is applied. A pair of subpixel electrodes 191a and 191b are applied with different data voltages preset for one input video signal, and the magnitude thereof depends on the size and shape of the subpixel electrodes 191a and 191b. Can be set. Further, the areas of the subpixel electrodes 191a and 191b may be different from each other. For example, the second subpixel electrode 191b is applied with a higher voltage than the first subpixel electrode 191a and has a smaller area than the first subpixel electrode 191a.

  The sub-pixel electrodes 191a and 191b to which the data voltage is applied and the common electrode 270 that receives the common voltage constitute the first and second liquid crystal capacitors, and maintain the applied voltage even after the thin film transistor is turned off. Each liquid crystal capacitor includes a liquid crystal layer 3 portion as a dielectric.

  The first and second subpixel electrodes 191a and 191b and the extended portions 177a and 177b of the drain electrodes 173a and 173b electrically connected to the first and second subpixel electrodes 191a and 191b are connected to the storage electrode line 131 including the storage electrode 137 and the extension 139. A storage capacitor that superimposes and enhances the voltage maintenance capability of the liquid crystal capacitor is formed.

  The contact assistants 81a, 81b, 82 are connected to the end portions 129a, 129b of the gate lines 121a, 121b and the end portion 179 of the data lines 171 through contact holes 181a, 181b, 182 respectively.

  Hereinafter, the common electrode panel 200 will be described.

  A light shielding member 220 is formed on an insulating substrate 210 made of transparent glass or plastic. The light shielding member 220 includes a linear portion corresponding to the data line 171, a partially expanded portion and a planar portion corresponding to the thin film transistor, and prevents light leakage between the pixel electrodes 191 and faces the pixel electrodes 191. Define the open area. However, the light shielding member 220 preferably has a plurality of openings (not shown) that face the pixel electrode 191 and have substantially the same shape as the pixel electrode 191.

  A plurality of color filters 230 are formed on the substrate 210. It is desirable that the color filter 230 exists mostly in a region surrounded by the light shielding member 230 and extends long in the vertical direction along the column of the pixel electrodes 191. Each color filter 230 can display one of the basic colors such as the three primary colors of red, green, and blue.

  An overcoat film 250 is formed on the color filter 230 and the light shielding member 220. The overcoat film 250 is preferably made of an (organic) insulator, and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat film 250 may be omitted.

  A common electrode 270 is formed on the overcoat film 250. The common electrode 270 is made of a transparent conductor such as ITO or IZO.

  A plurality of incisions 71, 72, 73a, 73b, 74a, 74b, and 75 are formed in the common electrode 270.

  One incision group 71 to 75 faces one pixel electrode 191, and includes a central incision 71, first to third lower oblique incisions 72, 73a, 74a, first to third upper oblique incisions 72, 73b, 74b and connecting portion 75 are included. Each of the incisions 71 to 74b is disposed between adjacent incisions 91, 92, 93, 94a, 94b of the pixel electrode 191 or between the incisions 91, 92, 93, 94a, 94b and the chamfered oblique sides of the pixel electrode 191. Has been. Each of the incisions 71 to 74b extends in parallel to the lower incisions 93 and 94a or the upper incisions 93 and 94b of the pixel electrode 191, and includes at least one hatched portion.

  The first lower and first upper oblique cutouts 72 extend substantially from the right side of the pixel electrode 191 to the left side of the pixel electrode 191, and the second lower and second upper oblique cutouts 73 a and 73 b are on the right side of the pixel electrode 191. It extends from the side to the upper left or lower left corner of the pixel electrode 191. The third lower and third upper oblique incisions 74a and 74b extend from the right side of the pixel electrode 191 to the upper side or lower side of the pixel electrode 191, and the third lower and third upper oblique incision 74a. , 74b, and a vertical horizontal portion extending while overlapping each other along the lower side and the upper side of the pixel electrode 191. The vertical transverse part forms an obtuse angle with the oblique line incisions 74a and 74b.

  The central incision 71 includes a central lateral portion and a pair of hatched portions. The central horizontal portion extends to the left along the storage electrode line 131 from the right side of the pixel electrode 191, and the pair of diagonal lines are the lower and upper diagonal lines from the end of the central horizontal portion toward the left side of the pixel electrode 191, respectively. It extends substantially parallel to the incisions 72-74b.

  One end of the second lower cutout 73a of the pixel electrode adjacent to one end of the hatched portion of the central cutout 71, and the second upper cutout 73b of the pixel electrode adjacent to one end of the other hatched portion of the central cutout 71. One end, one end of the third lower oblique incision 74a of the pixel electrode adjacent to one end of the first lower oblique incision 72, and the third upper oblique incision 74b of the pixel electrode adjacent to one end of the first upper oblique incision 72 One end of each is connected to the connecting portion 75. The connecting portion 75 is parallel to the first oblique side 90 a of the pixel electrode 191 and is located at a portion corresponding to the data line 171. The width of the connecting portion 75 is preferably about 8 μm wider than the distance between the pixel electrode 191 and the pixel electrode 191, and the extended portion 222 of the light shielding member 220 corresponds to the connecting portion 75 and is preferably wider than the other portions. .

  A triangular notch 7 is formed in the hatched portion of the incisions 71 to 74b. Such a notch may be square, trapezoidal or semi-circular, or may have a protruding shape or a recessed shape. Such a notch determines the alignment direction of the liquid crystal molecules 3 located at the region boundary corresponding to the incisions 71-74b.

  The number and direction of the incisions 71-75 vary depending on the design elements, and the light blocking member 220 can overlap the incisions 71 to 75 to block light leakage near the incisions 71-75.

  Alignment films 11 and 21 are applied to the inner side surfaces of the display panels 100 and 200, and these may be vertical alignment films.

  Polarizers (not shown) are provided on the outer surfaces of the display panels 100 and 200, and the polarization axes of the two polarizers are orthogonal to each other, and one of the polarization axes is relative to the gate lines 121a and 121b. It is desirable to be parallel. In the case of a reflective liquid crystal display device, one of the two polarizers may be omitted.

  The liquid crystal display device according to the present embodiment preferably further includes a phase retardation film (not shown) for compensating the delay value of the liquid crystal layer 3. The phase delay film has birefringence and reversely compensates for the phase delay of the liquid crystal layer 3.

  The liquid crystal layer 3 has a negative dielectric anisotropy, and the liquid crystal molecules of the liquid crystal layer 3 are aligned so that the major axis is perpendicular to the surfaces of the two display panels 100 and 200 in the absence of an electric field. ing. For this reason, incident light cannot pass through the orthogonal polarizer and is blocked.

  When a common voltage is applied to the common electrode 270 and a data voltage is applied to the pixel electrode 191 to generate a potential difference across the first or second liquid crystal capacitor, an electric field substantially perpendicular to the surfaces of the display panels 100 and 200 is generated in the liquid crystal layer 3. Is generated. For this reason, the liquid crystal molecules of the liquid crystal layer 3 are inclined so that the major axis thereof is perpendicular to the direction of the electric field in response to the electric field, and the degree of change in the polarization of the light incident on the liquid crystal layer 3 depends on the degree of inclination of the liquid crystal molecules. Different. Such a change in polarization appears as a change in transmittance by the polarizer, whereby the liquid crystal display device displays an image.

  The angle at which the liquid crystal molecules tilt depends on the strength of the electric field. When a low voltage is applied to the first subpixel electrode and a high voltage is applied to the second subpixel electrode, the voltage of the first liquid crystal capacitor ( Since Va) is larger than the voltage (Vb) of the second liquid crystal capacitor, the angles at which the liquid crystal molecules are inclined are different between the first subpixel and the second subpixel, and therefore the luminance of the two subpixels is different. Therefore, by appropriately matching the voltage (Va) of the first liquid crystal capacitor and the voltage (Vb) of the second liquid crystal capacitor, the image viewed from the side can be approximated to the image viewed from the front as much as possible. Visibility can be improved.

  The direction in which the liquid crystal molecules are tilted is determined by the horizontal component formed by distorting the electric field by the incisions 71-74b and 91-94b of the electric field generating electrodes 191 and 270 and the oblique sides of the pixel electrode 191, and the horizontal component of such an electric field. Is perpendicular to the sides of the incisions 71-74b and 91-94b and the sides of the pixel electrode 191.

  As shown in FIG. 26, one incision group 71-74b, 91-94b divides the pixel electrode 191 into a plurality of sub-areas each having two inclined major edges. The tilt direction of the liquid crystal molecules in each sub-region is determined by the direction determined by the horizontal component of the electric field, and the tilt directions are approximately four directions. In this way, the reference viewing angle of the liquid crystal display device can be widened by diversifying the directions in which the liquid crystal molecules are tilted.

  In addition, by forming the side adjacent to the data line 171 among the sides of the pixel electrode 191 in a sawtooth shape, the sub electric field formed between the adjacent pixel electrodes 191 enhances the alignment of the liquid crystal in the sub region. Act on. Further, by providing the connection portion 75 at a position corresponding to the region where the first oblique sides 90a of the two adjacent pixel electrodes 191 face each other, the alignment of the liquid crystal in the sub region can be further enhanced.

  The shape and arrangement of the incisions 71-74b and 91-94b for determining the tilt direction of the liquid crystal molecules can be changed, and at least one of the incisions 71-74b and 91-94b includes protrusions (not shown), A depressed portion (not shown) may be substituted. The protrusion is made of an organic material or an inorganic material, and is preferably disposed above or below the electric field generating electrodes 191 and 270.

  Further, the distortion of the side surface gamma curve can be reduced by making the area of the second subpixel electrode 191b to which a high voltage is applied smaller than the area of the first subpixel electrode 191a. In particular, when the area ratio of the first and second subpixel electrodes 191a and 191b is approximately 2: 1, the side face gamma curve is closer to the front gamma curve and the side face visibility is further improved.

  A liquid crystal display according to another embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 28 is a layout view of a liquid crystal display device according to another embodiment of the present invention, FIG. 29 is a cross-sectional view of the liquid crystal display device of FIG. 28 taken along line XXIX-XXIX, and FIG. FIG. 29 is a cross-sectional view of the liquid crystal display device of FIG. 28 taken along line XXX-XXX.

  As shown in FIGS. 28 to 30, the liquid crystal display device according to the present embodiment includes a thin film transistor array panel 100, a common electrode display panel 201, and a liquid crystal layer 3 therebetween.

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

  A plurality of gate conductors including a plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on an insulating substrate 110 made of transparent glass or plastic.

  The gate line 121 transmits a gate signal and extends mainly in the horizontal direction of FIG. Each gate line 121 includes an end portion 129 having a large area for connecting the first and second gate electrodes 124a and 124b projecting upward to another layer or an external driving circuit. The storage electrode line 131 extends mainly in the lateral direction of FIG. 28 upon application of a predetermined voltage. Each storage electrode line 131 is located between two adjacent gate lines 121 and is located at substantially the same distance as the two gate lines 121. Each storage electrode line 131 includes a storage electrode 137 that extends downward and a bar-like extension 139 that extends downward from the storage electrode 137. The storage electrode 137 is substantially rectangular and symmetrical with the storage electrode line 131, and the extension 139 extends to the vicinity of the first gate electrode 124a. However, the shape and arrangement of the storage electrode line 131 including the storage electrode 137 can be modified into various forms.

  On the gate conductors 121 and 131, a gate insulating film 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed.

  On the gate insulating film 140, a plurality of island-shaped semiconductors 154a, 154b, 157a, 157b made of hydrogenated amorphous silicon or polycrystalline silicon are formed. The semiconductors 154a and 154b are located on the gate electrodes 124a and 124b, respectively.

  A plurality of island-shaped ohmic contact members 163a, 163b, 165a, 165b, 167a, 167b are formed on the semiconductors 154a, 154b, 157a, 157b. The ohmic contact members 163a to 167b are preferably made of a material such as n + hydrogenated amorphous silicon doped with an n-type impurity such as phosphorus at a high concentration, or made of silicide. The ohmic contact members 163a and 165a and the ohmic contact members 163b and 165b are paired and located on the semiconductors 154a and 154b, respectively, and the ohmic contact members 167a and 167b are located on the semiconductors 157a and 157b, respectively.

  A data conductor including a plurality of data lines 171a and 171b and a plurality of pairs of first and second drain electrodes 175a and 175b is formed on the gate insulating layer 140 and the ohmic contact members 163a, 163b, 165a, 165b, 167a, and 167b. Is formed.

  The data lines 171a and 171b transmit data signals, and extend mainly in the vertical direction of FIG. 28 and intersect the gate lines 121 and the storage electrode lines 131. Each of the data lines 171a and 171b has an area for connecting a plurality of first and second source electrodes 173a and 173b extending toward the first and second gate electrodes 124a and 124b to another layer or an external driving circuit. Includes wide ends 179a, 179b.

  The first and second drain electrodes 175a and 175b are separated from each other and are also separated from the data lines 171a and 171b. The drain electrodes 175a and 175b are opposed to the first and second source electrodes 173a and 173b with the gate electrodes 124a and 124b as the center, and one end is a rectangular extension portion 177a and 177b having a large area, and the other is a rod shape. It includes end portions 176a and 176b and connection portions 176aa and 176bb connecting the extended portions 177a and 177b to the end portions 176a and 176b. Each extended portion 177a, 177b overlaps with the sustain electrode 137, and the rod-shaped end portions 176a, 176b overlap with the gate electrodes 124a, 124b, and are partially surrounded by the U-shaped source electrodes 173a, 173b.

  The connection part 176aa of the first drain electrode 1735a is mostly located on the extension part 139, extends parallel to the extension part 139, and is located within the vertical boundary line of the extension part 139. The area of the extension 177b of the second drain electrode 175b is smaller than the area of the extension 177a of the first drain electrode 175a.

  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, together with the semiconductors 154a and 154b, are first and second thin film transistors (Qa and Qb). The channel of the thin film transistor (Qa, Qb) is formed in the semiconductors 154a, 154b between the first and second source electrodes 173a, 173b and the first and second drain electrodes 175a, 175b.

  The ohmic contact members 163a to 167b exist only between the semiconductors 154a, 154b, 157a and 157b below the ohmic contact members 163a to 167b and the data lines 171a and 171b and the drain electrodes 175a and 175b thereabove, thereby reducing the contact resistance therebetween. The island-shaped semiconductors 154a and 154b have portions that are not covered and exposed, such as between the source electrodes 173a and 173b and the drain electrodes 175a and 175b.

  A protective film 180 is formed on the data lines 171a and 171b, the drain electrodes 175a and 175b, and the exposed portions of the semiconductors 154a and 154b.

  The protective film 180 has a plurality of contact holes 185a, 185b, 182a, and 182b that expose the extended portions 177a and 177b of the drain electrodes 175a and 175b and the end portions 179a and 179b of the data lines 171a and 171b, respectively. A plurality of contact holes 181 exposing the end portions 129 of the gate lines 121 are formed in the film 180 and the gate insulating film 140.

  A plurality of pixel electrodes 191 including a first and second subpixel electrodes 191a and 191b and a plurality of contact assistants 81, 82a, and 82b are formed on the protective film 180. These are preferably made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

  Each pixel electrode 191 has a substantially square shape with four corners chamfered, and the chamfered hypotenuse forms an angle of about 45 ° with respect to the gate line 121.

  A pair of first and second subpixel electrodes 191a and 191b constituting each pixel electrode 191 are in mesh with each other with a gap 92 and 93 therebetween. The second subpixel electrode 191b has an isosceles trapezoid shape that is substantially rotated and has a base that is recessed in a trapezoidal shape, and is mostly surrounded by the first subpixel electrode 191a. The first subpixel electrode 191a includes an upper part, a lower part, and a central trapezoidal part connected to each other on the left side.

  Each pixel electrode 191 is connected to a pair of first main sides 193, 194 facing each other and the first main sides 193, 194, and a plurality of saw-shaped portions 90 are connected to the bases connecting the saw-shaped portions 90. A second main side including 90c. The saw-shaped portion 90 has a first hypotenuse 90a and a second hypotenuse 90d inclined with respect to the first main sides 193 and 194, and an upper side 90b connecting the first hypotenuse 90a and the second hypotenuse 90d. The first main sides 193 and 194 are parallel to the gate line 121. The first main sides 193 and 194 and the second main side are substantially rectangular, and the four corners of the pixel electrode 191 are chamfered to form an angle of about 45 ° with the gate line 121. The first oblique side 90a partially overlaps with the data line 171. The first oblique sides 90a of two adjacent pixel electrodes 191 face each other and are parallel to each other.

  The first subpixel electrode 191a has incisions 94a and 94b extending from the upper side of the upper trapezoidal part and the lower side of the lower trapezoidal part toward the right side. The central trapezoidal portion of the first subpixel electrode 191a is sandwiched between the concave bottoms of the second subpixel electrode 191b. The first subpixel electrode 191a has a central cutout 91 including a horizontal portion and a pair of shaded portions connected to the horizontal portion. The horizontal portion extends shortly along the horizontal center line of the first subpixel electrode 191 a, and the pair of shaded portions extend from the horizontal portion toward the left side of the first subpixel electrode 191 a, and is connected to the storage electrode line 131. It makes an angle of about 45 ° with respect to it. The gaps 92 and 93 between the first subpixel electrode 191a and the second subpixel electrode 191b include two pairs of upper and lower hatched portions and a vertical portion that form an angle of about 45 ° with the gate line 121.

  The incisions 91-94b are substantially inversion symmetrical with respect to the storage electrode line 131, and these extend perpendicularly to each other while forming an angle of about 45 ° with respect to the gate line 121. The pixel electrode 191 is divided into a plurality of regions by the incisions 91-94b.

  Accordingly, the upper half and the lower half around the storage electrode line 131 that bisects the pixel electrode 191 in the horizontal direction are each divided into four regions by the cutout portions 91-94b.

  At this time, the number of regions or the number of cutouts varies depending on design factors such as the size of the pixel electrode 191, the ratio of the length of the horizontal and vertical sides of the pixel electrode 191, the type and characteristics of the liquid crystal layer 3.

  The first and second subpixel electrodes 191a and 191b are connected to the first and second drain electrodes 175a and 175b through the contact holes 185a and 185b, respectively. The data voltage is supplied from the first and second drain electrodes 175a and 175b. Is applied. A pair of subpixel electrodes 191a and 191b are applied with different data voltages set in advance for one input video signal, and the magnitude thereof depends on the size and shape of the subpixel electrodes 191a and 191b. Can be set. Further, the areas of the subpixel electrodes 191a and 191b may be different from each other. For example, the second subpixel electrode 191b receives a higher voltage than the first subpixel electrode 191a and has a smaller area than the first subpixel electrode 191a.

  The first and second subpixel electrodes 191a and 191b are physically and electrically connected to the first and second drain electrodes 173a and 173b through the contact holes 185a and 185b. Data voltages are applied from 173a and 173b. A pair of subpixel electrodes 191a and 191b are applied with different data voltages set in advance for one input video signal, and the magnitude thereof depends on the size and shape of the subpixel electrodes 191a and 191b. Can be set. Further, the areas of the subpixel electrodes 191a and 191b may be different from each other. For example, the second subpixel electrode 191b receives a higher voltage than the first subpixel electrode 191a and has a smaller area than the first subpixel electrode 191a.

  In the sub-pixel electrodes 191a and 191b to which the data voltage is applied, the common electrode 270 that receives the common voltage constitutes the first and second liquid crystal capacitors and maintains the applied voltage even after the thin film transistor is turned off. Each liquid crystal capacitor includes a liquid crystal layer 3 portion as a dielectric.

  The extended portions 177a and 177b of the first and second subpixel electrodes 191a and 191b and the drain electrodes 173a and 173b electrically connected to the first and second subpixel electrodes 191a and 191b are connected to the sustain electrode 137 and the extended portion 139 via the gate insulating film 140. A storage capacitor is formed that overlaps with the storage electrode line 131 as a starting point and enhances the voltage maintenance capability of the liquid crystal capacitor.

  The contact assistants 81, 82a, and 82b are connected to the end portions 129 of the gate lines 121 and the end portions 179a and 179b of the data lines 171a and 171b through contact holes 181, 182a, and 182b, respectively.

  Hereinafter, the common electrode panel 200 will be described.

  A light shielding member 220 is formed on an insulating substrate 210 made of transparent glass or plastic. The light blocking member 220 has a linear portion corresponding to the data line 171, a partially expanded portion and a planar portion corresponding to the thin film transistor, and prevents light leakage between the pixel electrodes 191 and faces the pixel electrodes 191. Define the opening area to be. However, it is desirable that the light shielding member 220 has a plurality of openings (not shown) facing the pixel electrode 191 and having substantially the same shape as the pixel electrode 191.

  A plurality of color filters 230 are formed on the substrate 210. It is desirable that the color filter 230 exists mostly in a region surrounded by the light shielding member 230 and extends long in the vertical direction along the column of the pixel electrodes 191. Each color filter 230 can display one of the basic colors such as the three primary colors of red, green, and blue.

  An overcoat film 250 is formed on the color filter 230 and the light shielding member 220. The overcoat film 250 is preferably made of an (organic) insulator, and prevents the color filter 230 from being exposed and provides a flat surface. The overcoat film 250 may be omitted.

  A common electrode 270 is formed on the overcoat film 250. The common electrode 270 is formed of a transparent conductor such as ITO or IZO.

  A plurality of incisions 71, 72, 73a, 73b, 74a, 74b, and 75 are formed in the common electrode 270.

  One incision group 71 to 75 faces one pixel electrode 191, and includes a central incision 71, first to third lower oblique incisions 72, 73a, 74a, first to third upper oblique incisions 72, 73b, 74b and connecting portion 75 are included. Each of the incisions 71 to 74b is disposed between adjacent incisions 91, 92, 93, 94a, 94b of the pixel electrode 191 or between the incisions 91, 92, 93, 94a, 94b and the chamfered oblique sides of the pixel electrode 191. Has been. Each of the incisions 71 to 74b includes at least one hatched portion extending in parallel with the lower incisions 92, 93, 94a of the pixel electrode 191 or the upper incisions 92, 93, 94b.

  The first lower and first upper oblique cutouts 72 extend substantially from the right side of the pixel electrode 191 to the left side of the pixel electrode 191, and the second lower and second upper oblique cutouts 73 a and 73 b are on the right side of the pixel electrode 191. It extends from the side to the upper left or lower left corner of the pixel electrode 191. The third lower and third upper oblique incisions 74a and 74b extend from the right side of the pixel electrode 191 to the upper side or lower side of the pixel electrode 191, and the third lower and third upper oblique incision 74a. , 74b, and a vertical horizontal portion that extends while overlapping each other along the lower and upper sides of the pixel electrode 191. The vertical transverse part forms an obtuse angle with the oblique line incisions 74a and 74b.

  The central incision 71 includes a central lateral portion and a pair of hatched portions. The central horizontal portion extends to the left along the storage electrode line 131 from the right side of the pixel electrode 191, and the pair of diagonal lines are the lower and upper diagonal lines from the end of the central horizontal portion toward the left side of the pixel electrode 191, respectively. It extends substantially parallel to the incisions 72-74b.

  One end of the second lower cutout 73a of the pixel electrode adjacent to one end of the hatched portion of the central cutout 71, and the second upper cutout 73b of the pixel electrode adjacent to one end of the other hatched portion of the central cutout 71. One end, one end of the third lower oblique incision 74a of the pixel electrode adjacent to one end of the first lower oblique incision 72, and the third upper oblique incision 74b of the pixel electrode adjacent to one end of the first upper oblique incision 72 One end of each is connected to the connecting portion 75. The connecting portion 75 is parallel to the first oblique side 90 a of the pixel electrode 191 and is located at a portion corresponding to the data line 171. The width of the connecting portion 75 is preferably about 8 μm wider than the distance between the pixel electrode 191 and the pixel electrode 191, and the extended portion 222 of the light shielding member 220 corresponds to the connecting portion 75 and is preferably wider than the other portions.

  A triangular notch 7 is formed in the hatched portion of the incision 71-74b. Such a notch may have a quadrangular, trapezoidal or semicircular shape, or may have a protruding shape or a recessed shape. Such a notch determines the alignment direction of the liquid crystal molecules 3 located at the region boundary corresponding to the incisions 71-74b.

  The number and direction of the incisions 71-75 vary depending on the design elements, and the light blocking member 220 can overlap the incisions 71 to 75 to block light leakage near the incisions 71-75.

  In addition, by forming the side adjacent to the data line 171 among the sides of the pixel electrode 191 in a sawtooth shape, the sub electric field formed between the adjacent pixel electrodes 191 enhances the alignment of the liquid crystal in the sub region. Act on. Further, by providing the connection portion 75 at a position corresponding to the region where the first oblique sides 90a of the two adjacent pixel electrodes 191 face each other, the alignment of the liquid crystal in the sub region can be further enhanced.

  Alignment films 11 and 21 are applied to the inner side surfaces of the display plates 101 and 201, and a polarizer (not shown) is provided on the outer side surface.

  The preferred embodiment of the present invention has been described above, but this is merely an example, and various modifications and equivalents may be made based on the present invention as long as the person has ordinary knowledge in the technical field. It will be appreciated that the following embodiments are possible. Therefore, the true technical protection scope of the present invention also includes various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the claims. .

11, 21 Alignment films 12, 22 Polarizers 71, 72a, 72b, 73a, 73b, 74a, 74b, 75 Common electrode incisions 81, 81a, 81b, 82, 82a, 82b Contact assisting members 91, 92, 92a, 92b, 93, 94a, 94b Pixel electrode incisions 110, 210 Substrate 121, 121a, 121b, 129a, 129b, 129 Gate lines 124, 124a, 124b Gate electrode 140 Gate insulating films 151, 154, 154a, 154b Semiconductor 161, 163, 163a, 163b, 165, 165a, 165b, 166 Ohmic contact members 171, 171a, 171b, 179, 179a, 179b Data lines 173, 173a, 173b Source electrodes 175, 175a, 175b Drain electrode 180 Protective films 181, 181a, 18 b, 182,182a, 182b, 183a, 183b, 185,185a, 185b contact hole (contact hole)
191 Pixel electrode 230 Color filter 250 Overcoat film 270 Common electrode

Claims (16)

A pixel electrode having a first incision formed in each pixel and dividing each pixel into a plurality of sub-regions;
A second electrode that divides each pixel into a plurality of sub-regions together with the first electrode, and a common electrode facing the pixel electrode;
A liquid crystal layer positioned between the pixel electrode and the common electrode;
With
Each of the sub-regions has a pair of main sides facing each other and a plurality of sub-sides connected thereto,
The main sides of two sub-regions respectively included in two adjacent pixel electrodes are shifted from each other,
The liquid crystal display device, wherein the common electrode has a connection cutout portion that is located in a gap between adjacent pixel electrodes and connects the second cutout portions of adjacent pixels.   The liquid crystal display device according to claim 1, wherein the main side forms an oblique angle with the first and second cutouts.   The liquid crystal display device according to claim 1, wherein at least one of the sub-sides of each sub-region intersects with the main side at an angle greater than 135 °.   2. The liquid crystal display device according to claim 1, wherein a main side of each sub-region includes a first main side and a second main side shorter than the first main side.   A part of the side of the pixel electrode forms a sub-side of the sub-region, and the second cut-out portion does not overlap with a part of the side of the pixel electrode forming the sub-side of the sub-region. The liquid crystal display device according to claim 1.   The liquid crystal display device according to claim 1, wherein the connection incision part and the second incision part form an obtuse angle.   The liquid crystal display device according to claim 1, wherein a width of the connection cutout is wider than a width of the gap.   The liquid crystal display device according to claim 1, further comprising a data line overlapping with a sub-side of the sub-region.   The liquid crystal display device according to claim 8, wherein the connection cut-out portion faces the data line.   The liquid crystal display device according to claim 8, further comprising a light shielding member facing the data line.   A part of a sub-side of the sub-region does not overlap with the data line, and the light shielding member further includes an extension part that blocks a part of the sub-side of the sub-region that does not overlap with the data line. The liquid crystal display device according to claim 10.   The pixel electrode according to claim 1, wherein the pixel electrode includes at least two subpixel electrodes physically separated from each other by a part of the first cutout. Liquid crystal display device. In the one pixel electrode, each sub-pixel electrode is connected to a different data line,
13. The liquid crystal display device according to claim 12, wherein in each of the one pixel electrode, each sub-pixel electrode is connected to the same gate line. In the one pixel electrode, each sub-pixel electrode is connected to a different gate line,
13. The liquid crystal display device according to claim 12, wherein in each of the one pixel electrode, each sub-pixel electrode is connected to the same data line.   The liquid crystal display device according to claim 1, wherein the pixel electrode includes third cutouts arranged alternately with the connection cutouts.   The liquid crystal display device according to claim 1, wherein the gate line and the connection cut-out portion form 45 °.

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