Patent Publication Number: US-2007109238-A1

Title: Liquid crystal display and method thereof

Description:
This application claims priority to Korean Patent Application No. 10-2005-0108427, filed on Nov. 14, 2005 and all the benefits accruing therefrom under 35 U.S.C. §119, and the contents of which in its entirety are herein incorporated by reference.  
     BACKGROUND OF THE INVENTION  
      (a) Field of the Invention  
      The present invention relates to a liquid crystal display (“LCD”) and method thereof. More particularly, the present invention relates to an LCD having improved lateral visibility and a method of improving lateral visibility in the LCD.  
      (b) Description of the Related Art  
      Generally, liquid crystal displays (“LCDs”) have been widely used as an example of a flat display device. The LCD includes two display panels on which field generating electrodes, such as pixel electrodes and a common electrode, are formed, and a liquid crystal layer interposed between the two display panels. In the LCD, an electric field is generated in the liquid crystal layer by applying a voltage to the field generating electrodes so as to determine alignment of liquid crystal molecules in the liquid crystal layer, and images are displayed by controlling polarization of incident light.  
      The LCD further includes switching elements that are respectively connected to the pixel electrodes, and a plurality of signal lines, such as gate lines, data lines, and the like, that control the switching elements to allow a voltage to be applied to the pixel electrodes.  
      An LCD of a vertically aligned (“VA”) mode has a large contrast ratio and a wide reference viewing angle, in which long axes of liquid crystal molecules are perpendicular to the upper and lower display panels in a state in which an electric field is not applied. In this case, the reference viewing angle refers to a viewing angle at which a contrast ratio is 1:10, or a luminance inversion limit angle between grays.  
      As a method of achieving a wide viewing angle in an LCD of a VA mode, there are a method of forming a cutout in a field generating electrode, and a method of forming a protrusion above or below the field generating electrode. Since the cutouts and the protrusions determine a tilt direction of liquid crystal molecules, the tilt direction of liquid crystal molecules is decentralized by appropriately disposing the cutouts and the protrusions, thereby widening a reference viewing angle.  
      As a method of improving lateral visibility, the following method has been suggested. One pixel is divided into two subpixels, and the divided two subpixels are capacitively coupled with each other. Then, a voltage is directly applied to one subpixel, and a voltage drop through the capacitive coupling is generated in the other subpixel, such that voltages between the two subpixels are different from each other, which causes transmittance to be different in the two subpixels.  
     BRIEF SUMMARY OF THE INVENTION  
      Exemplary embodiments of the present invention provide a liquid crystal display (“LCD”) including a substrate, and pixel electrodes formed on the substrate, each of the pixel electrodes having first and second subpixel electrodes. Each of the first and second subpixel electrodes has at least two parallelogrammic electrode pieces, each of the two parallelogrammic electrode pieces having lengthwise edges and oblique edges adjacent to the lengthwise edges.  
      In each of the first and second subpixel electrodes, the lengthwise edges of the at least two electrode pieces may contact each other. In each of the first and second subpixel electrodes, the oblique edges of the at least two electrode pieces may form a right angle so as to be connected to each other.  
      A height of the first subpixel electrode may be different from a height of the second subpixel electrode.  
      The first subpixel electrode and the second subpixel electrode may be adjacent to each other in a vertical direction. A lengthwise center line of the first subpixel electrode may be aligned with a lengthwise center line of the second subpixel electrode.  
      The LCD according to the exemplary embodiment of the present invention may further include a common electrode that faces the pixel electrodes, and first inclination direction determining members that are formed on the common electrode.  
      The first inclination direction determining members may include a plurality of first cutouts that have oblique portions substantially parallel to the oblique edges of the electrode pieces.  
      The LCD according to the exemplary embodiment of the present invention may further include second inclination direction determining members, each of which is formed in each of the first and second subpixel electrodes.  
      The second inclination direction determining members may have a plurality of second cutouts that have oblique portions substantially parallel to the oblique edges of the electrode pieces.  
      A voltage of the first subpixel electrode and a voltage of the second subpixel electrode may be different from each other.  
      An area of the first subpixel electrode may be smaller than an area of the second subpixel electrode, and the voltage of the first subpixel electrode may be larger than the voltage of the second subpixel electrode.  
      The first subpixel electrode and the second subpixel electrode may be applied with different data voltages obtained from image information.  
      The LCD according to the exemplary embodiments of the present invention may further include first thin film transistors (“TFTs”) connected to corresponding first subpixel electrodes, second TFTs connected to corresponding second subpixel electrodes, first signal lines connected to the first TFTs, second signal lines connected to the second TFTs, and third signal lines connected to the first and second TFTs and crossing the first and second signal lines.  
      The first and second TFTs may be turned on according to signals supplied through the first and second signal lines, and may transmit signals supplied through the third signal lines.  
      Alternatively, the first and second TFTs may be turned on according to signals supplied through the third signal lines, and may transmit signals supplied through the first and the second signal lines.  
      The LCD according to the exemplary embodiments of the present invention may further include fourth signal lines crossing the pixel electrodes. The first and second TFTs may have first and second drain electrodes overlapping the fourth signal lines.  
      The first subpixel electrode and the second subpixel electrode may be capacitively coupled with each other.  
      The LCD according to other exemplary embodiments of the present invention may include TFTs connected to corresponding first subpixel electrodes, first signal lines connected to corresponding TFTs, and second signal lines connected to the TFTs and crossing the first signal lines.  
      The first and second subpixel electrodes may be connected to each other.  
      Other exemplary embodiments of the present invention provide an LCD including a substrate, and pixel electrodes formed on the substrate. Each of the pixel electrodes has at least two parallelogrammic electrode pieces, and each of the parallelogrammic electrode pieces has lengthwise edges and oblique edges adjacent to the lengthwise edges.  
      The lengthwise edges of the at least two electrode pieces may come into contact with each other. The oblique edges of the at least two electrode pieces may form a right angle so as to be connected to each other.  
      The LCD according to other exemplary embodiments of the present invention may further include TFTs connected to the pixel electrodes, first signal lines connected to the TFTs, and second signal lines connected to the TFTs and crossing the first signal lines.  
      In the above-described embodiments, each of the first and second subpixel electrodes may have a substantially simple concave hexagon shape formed in an arrow shape with one concavity. A convex portion of the first subpixel electrodes may be nested within the concavity of adjacent second subpixel electrodes, and a convex portion of the second subpixel electrodes may be nested within the concavity of adjacent first subpixel electrodes.  
      Other exemplary embodiments of the present invention provide a method of improving lateral visibility in a liquid crystal display, the method including forming gate lines in a first direction on a substrate, forming data lines in a second direction on the substrate, and forming at least one pixel electrode per pixel area on the substrate, the at least one pixel electrode having a substantially simple concave hexagon shape formed in an arrow shape with one concavity, the arrow shape pointing in the second direction.  
      Forming the at least one pixel electrode per pixel area may include forming first and second subpixel electrodes per pixel area, each of the first and second subpixel electrodes having a substantially simple concave hexagon shape formed in an arrow shape with one concavity, the arrow shape pointing in the second direction, the second subpixel electrodes nesting within concavities of adjacent first pixel electrodes, and the first subpixel electrodes nesting within concavities of adjacent second subpixel electrodes.  
      Forming the at least one pixel electrode per pixel area may also include forming first and second subpixel electrodes per pixel area and forming an area of the first subpixel electrodes smaller than an area of the second subpixel electrodes, and the method may further include applying a larger voltage via the data lines to the first subpixel electrodes than to the second subpixel electrodes. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The present invention will become more apparent by further describing exemplary embodiments thereof with reference to the accompanying drawings, in which:  
       FIG. 1  is a block diagram illustrating an exemplary liquid crystal display (“LCD”) device according to an exemplary embodiment of the present invention;  
       FIG. 2  is an equivalent circuit diagram of two exemplary subpixels in an exemplary LCD according to an exemplary embodiment of the present invention;  
       FIG. 3  is an equivalent circuit diagram of one exemplary subpixel in an exemplary LCD according to an exemplary embodiment of the present invention;  
       FIGS. 4A and 4B  are views illustrating an exemplary pixel electrode in an exemplary LCD according to an exemplary embodiment of the present invention;  
       FIG. 5  is a layout view of an exemplary LCD according to an exemplary embodiment of the present invention;  
       FIGS. 6 and 7  are cross-sectional views taken along lines VI-VI and VII-VII in the exemplary LCD shown in  FIG. 5 ;  
       FIG. 8  is an equivalent circuit diagram of an exemplary pixel in an exemplary LCD according to another exemplary embodiment of the present invention;  
       FIG. 9  is a layout view of an exemplary LCD according to another exemplary embodiment of the present invention;  
       FIG. 10  is an equivalent circuit diagram of an exemplary pixel in an exemplary LCD according to another exemplary embodiment of the present invention;  
       FIG. 11  is a layout view of an exemplary LCD according to another exemplary embodiment of the present invention;  
       FIG. 12  is an equivalent circuit diagram of an exemplary pixel in an exemplary LCD according to another exemplary embodiment of the present invention; and,  
       FIG. 13  is a layout view of an exemplary LCD according to another exemplary embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.  
      In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like reference numerals designate like elements throughout the specification. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.  
      It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.  
      The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.  
      Spatially relative terms, such as “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.  
      Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.  
      Embodiments of the present invention are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments of the present invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the present invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present invention.  
      Since it is difficult for light to be transmitted at portions where protrusions or cutouts are formed, when the number of protrusions and cutouts is increased, the aperture ratio is decreased. In order to increase the aperture ratio, a structure has been suggested for increasing the size of each pixel electrode. However, in this case, since the distance between pixel electrodes and the distance between a pixel electrode and a data line are short, a strong lateral field is generated at a pixel electrode edge. Alignment of the liquid crystal molecules is scattered due to the lateral field. As a result, texture or light leakage occurs, and the response time is increased.  
      Further, liquid crystal displays (“LCDs”) of a vertically aligned (“VA”) mode have poor lateral visibility as compared with front visibility. For example, in an LCD of a patterned vertically aligned (“PVA”) mode, images gradually become brighter in a lateral direction. In the worst case, the luminance difference between high grays does not exist, and thus pictures may be viewed in a state in which they are broken.  
      Thus, the present invention provides an LCD having advantages of improving lateral visibility.  
      Further, the present invention provides an LCD having advantages of forming pixels with a simple structure.  
      Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.  
      First, an LCD according to an exemplary embodiment of the present invention will be described with reference to  FIGS. 1 and 2 .  
       FIG. 1  is a block diagram of an exemplary LCD according to an exemplary embodiment of the present invention, and  FIG. 2  is an equivalent circuit diagram of two exemplary subpixels in an exemplary LCD according to an exemplary embodiment of the present invention.  
      As shown in  FIG. 1 , an LCD includes a liquid crystal panel assembly  300 , a gate driver  400  and a data driver  500  that are connected to the liquid crystal panel assembly  300 , a gray voltage generator  800  that is connected to the data driver  500 , and a signal controller  600  that controls the above-described elements.  
      As viewed in an equivalent circuit, the liquid crystal panel assembly  300  includes a plurality of signal lines G 1a  to G nb  and D 1  to D m , and a plurality of pixels PX that are connected to the plurality of signal lines G 1a  to G nb  and D 1  to D m  and disposed in a matrix. In  FIG. 2 , the liquid crystal panel assembly  300  includes lower and upper panels  100  and  200  that face each other, and a liquid crystal layer  3  that is interposed between there between.  
      The signal lines G 1a  to G nb  and D 1  to D m  have a plurality of gate lines G 1a  to G nb  that transmit gate signals (also referred to as “scanning signals”), and a plurality of data lines D 1  to D m  that transmit data signals. The gate lines G 1a  to G nb  extend in a row direction, a first direction, so as to be substantially parallel to one another, and the data lines D 1  to D m  extend in a column direction, a second direction, so as to be substantially parallel to one another. The first direction may be substantially perpendicular to the second direction.  
      Each of the pixels PX has a pair of subpixels, and each of the subpixels has a liquid crystal capacitor Clca or Clcb. At least one of the two subpixels has a switching element (not shown) that is connected to a gate line, a data line, and a liquid crystal capacitor Clca or Clcb.  
      The liquid crystal capacitor Clca/Clcb uses a subpixel electrode PEa/PEb of the lower panel  100  and the common electrode CE of the upper panel  200  as two terminals, and the liquid crystal layer  3  between the subpixel electrode PEa/PEb and the common electrode CE functions as a dielectric material. The pair of subpixel electrodes PEa and PEb are separated from each other, and form one pixel electrode PE. The common electrode CE is formed on an entire surface, or substantially an entire surface, of the upper panel  200 , and is applied with a common voltage Vcom. The liquid crystal layer  3  has negative dielectric anisotropy, and long axes of liquid crystal molecules in the liquid crystal layer  3  may be perpendicular to the surfaces of the two display panels  100 ,  200  in the absence of an electric field.  
      Meanwhile, in order to implement color display, each pixel PX is allowed to display one color from a set of colors, such as primary colors (spatial division), and each pixel is allowed to alternately display the colors with the passage of time (temporal division), which causes desired colors to be recognized by spatial and temporal sums of the colors. Examples of the set of colors may include three colors, such as red, green, and blue.  FIG. 2  is an example of a spatial division, which illustrates a case in which each pixel PX has a color filter CF for displaying one of the colors, such as one of the primary colors, in a region of the upper panel  200 . Alternatively, the color filter CF may be formed above or below the subpixel electrodes PEa and PEb of the lower panel  100 .  
      Two polarizers  12  and  22  (see  FIG. 6 ) are provided on external surfaces of the display panels  100  and  200 , and polarization axes of the two polarizers may be orthogonal to each other. In a reflective LCD, one of the two polarizers  12  and  22  may be omitted. In a case of a crossed polarizer, light incident on the liquid crystal layer  3  in the absence of an electric field is blocked.  
      Referring back to  FIG. 1 , the gray voltage generator  800  generates a plurality of gray voltages (or reference gray voltages) related to the transmittance of the pixels PX. However, the gray voltage generator  800  may generate only a given number of gray voltages instead of generating all of the gray voltages.  
      The gate driver  400  that is connected to the gate lines G 1a  to G nb  of the liquid crystal panel assembly  300  applies a gate signal (Vg) that is composed of a gate-on voltage Von and a gate-off voltage Voff to the gate lines G 1a  to G nb .  
      The data driver  500  is connected to the data lines D 1  to D m  of the liquid crystal panel assembly  300  and applies data voltages Vd, which are selected from the gray voltages supplied from the gray voltage generator  800 , to the data lines D 1  to D m .  
      However, in a case in which the gray voltage generator  800  does not supply voltages for all grays and supplies only a predetermined number of reference gray voltages, the data driver  500  divides the reference gray voltages to generate gray voltages for all grays, and selects a data signal from the generated gray voltages.  
      The signal controller  600  controls the gate driver  400  and data driver  500 .  
      Each of the drivers  400 ,  500 ,  600 , and  800  may be mounted on the liquid crystal panel assembly  300  in a type of at least one integrated circuit (“IC”) chip, mounted on a flexible printed circuit (“FPC”) film (not shown) so as to be attached to the liquid crystal panel assembly  300  in a type of a tape carrier package (“TCP”), or mounted on a separate printed circuit board (“PCB”) (not shown). However, each of the drivers  400 ,  500 ,  600 , and  800  may be directly integrated on the liquid crystal panel assembly  300 . Further, each of the drivers  400 ,  500 ,  600 , and  800  may be integrated in a single chip. In this case, at least one of the drivers  400 ,  500 ,  600 , and  800  or at least one circuit of each of the drivers  400 ,  500 ,  600 , and  800  may be disposed outside the single chip.  
      A structure of the liquid crystal panel assembly will be further described with reference to FIGS.  3  to  7  and  FIGS. 1 and 2 .  
       FIG. 3  is an equivalent circuit diagram of one exemplary pixel in a liquid crystal panel assembly according to an exemplary embodiment of the present invention.  
      Referring to  FIG. 3 , the liquid crystal panel assembly according to the present exemplary embodiment includes signal lines that have a plurality of pairs of gate lines GLa and GLb, a plurality of data lines DL, and a plurality of storage electrode lines SL, as well as a plurality of pixels PX that are connected to the plurality of signal lines.  
      Each pixel PX has a pair of subpixels PXa and PXb, and each subpixel PXa/PXb includes a switching element Qa/Qb that is connected to a corresponding gate line GLa/GLb and a corresponding data line DL, a liquid crystal capacitor Clca/Clcb that is connected to the switching element Qa/Qb, and a storage capacitor Csta/Cstb that is connected to the switching element Qa/Qb and the storage electrode line SL.  
      Each switching element Qa/Qb corresponds to a three-terminal element, such as a thin-film transistor (“TFT”), provided in the lower panel  100 , and has a control terminal, such as a gate electrode, connected to a gate line GLa/GLb, an input terminal, such as a source electrode, connected to the data line DL, and an output terminal, such as a drain electrode, connected to the liquid crystal capacitor Clca/Clcb and the storage capacitor Csta/Cstb.  
      The storage capacitor Csta/Cstb that performs an auxiliary function of the liquid crystal capacitor Clca/Clcb is formed by overlapping the storage electrode line SL and the pixel electrode PE included in the lower panel  100  with an insulator there between. A predetermined voltage, such as a common voltage Vcom, is applied to the storage electrode line SL. However, the storage capacitors Csta and Cstb may be formed by overlapping the subpixel electrodes PEa and PEb and a previous gate line right above the subpixel electrodes PEa and PEb with an insulator there between.  
      Each of the subpixel electrodes PEa and PEb has at least a parallelogrammic electrode piece  196  as shown in  FIG. 4A , and a parallelogrammic electrode piece  197  as shown in  FIG. 4B .  
      As shown in  FIGS. 4A and 4B , the electrode piece  196  has a pair of oblique edges  196   o  and  196   o  and a pair of lengthwise edges  196   t  and  196   t , the electrode piece  197  has a pair of oblique edges  197   o  and  197   o  and a pair of lengthwise edges  197   t  and  197   t , and each of the electrode pieces  196  and  197  is substantially parallelogrammic. The oblique edges  196   o  and  197   o  form an oblique angle with respect to the lengthwise edges  196   t  and  197   t , and the oblique angle is preferably within a range of 45 to 135°. For convenience, based on a direction inclined vertical to the lengthwise edges  196   t  and  197   t  (“oblique direction”), a case of being inclined rightward as shown in  FIG. 4A  is referred as “rightward inclination” and a case of being inclined leftward as shown in  FIG. 4B  is referred as “leftward inclination”.  
      In the electrode pieces  196  and  197 , the length between the lengthwise edges  196   t  and  197   t  that is the width, and the length between the oblique edges  196   o  and  197   o , that is the height, can be freely determined according to a size of the liquid crystal display panel assembly  300 . Further, in the electrode pieces  196  and  197 , the lengthwise edges  196   t  and  197   t  may be bent or protruded to deform, considering to the relationship with the other portions, and in the description below, even if all types of deformation are made in the electrode pieces  196  and  197 , the electrode pieces  196  and  197  will still be referred to as having parallelogrammic shapes.  
      In the first and second subpixel electrodes  191   a  and  191   b , as will be described with reference to  FIG. 5 , the parallelogrammic electrode pieces  196  and  197 , each of which has different inclination, are connected to each other in a row direction. The lengthwise edges  196   t  and  197   t  of the parallelogrammic electrode pieces  196  and  197  come into contact with each other. The oblique edges  196   o  and  197   o  of the parallelogrammic electrode pieces  196  and  197  are connected to each other to form an oblique angle or a right angle, and the oblique angle is preferably about 90°.  
      The first and second subpixel electrodes  191   a  and  191   b  are adjacent to each other in a column direction. The height of the second subpixel electrode  191   b  is larger than that of the first subpixel electrode  191   a . Specifically, the height of the second subpixel electrode  191   b  is larger than that of the first subpixel electrode  191   a  within a range of 1.1 to 2 times thereof. The width of the second subpixel electrode  191   b  is slightly larger than that of the first subpixel electrode  191   a . Accordingly, the area of the second subpixel electrode  191   b  is larger than that of the first subpixel electrode  191   a , specifically within a range of 1.5 to 2 times thereof. However, the present invention is not limited thereto, and a desired area ratio between the first and second subpixel electrodes  191   a  and  191   b  can be obtained by adjusting the height and the width of each of the first and second subpixel electrodes  191   a  and  191   b . Preferably, the area ratio between the first and second subpixel electrodes  191   a  and  191   b  is within a range of 1:1.1 to 1:3.  
      As such, each of the first and second subpixel electrodes  191   a  and  191   b  is bent once in a horizontal direction. In other words, each of the first and second subpixel electrodes  191   a  and  191   b  may have a substantially simple concave hexagon shape formed in an arrow shape with one concavity. By simple, it should be understood that the outside edges do not cross. A convex portion of the first subpixel electrodes  191   a  (the pointed portion of the arrow shape) may be nested within the concavity of adjacent second subpixel electrodes  191   b , and a convex portion of the second subpixel electrodes  191   b  may be nested within the concavity of adjacent first subpixel electrodes  191   a . Thus, the first and second subpixel electrodes  191   a  and  191   b  are nested alternatingly in the column direction. Accordingly, it is possible to easily form regions of the three pixel electrodes  191  that correspond to a color filter CF for displaying one of the three colors in the set of colors including red (R), green (G), and blue (B). Further, areas overlapping the data lines  171   a  and  171   b , as will also be described with reference to  FIG. 5 , may be easily adjusted.  
      In the LCD including the liquid crystal panel assembly  300 , the signal controller  600  receives input image signals R, G, and B for each pixel PX, converts them into a plurality of output image data DAT for two subpixels PXa and PXb to be supplied to the data driver  500 . Otherwise, the gray voltage generator  800  generates separate groups of gray voltages for two subpixels PXa and PXb. The two groups of gray voltages are alternately supplied by the gray voltage generator  800  to the data driver  500  or alternately selected by the data driver  500  such that the two subpixels PXa and PXb are supplied with different voltages. At this time, the values of the converted output image signals and the values of the gray voltages in each group are preferably determined such that the synthesis of gamma curves for the two subpixels PXa and PXb approaches a reference gamma curve at a front view. For example, the synthesized gamma curve at the front view coincides with the suitable gamma curve at a front view, and the synthesized gamma curve at a lateral curve at a lateral view is the most similar to the gamma at a front view.  
      Hereinafter, an example of the LCD shown in  FIG. 3  will be described with reference to FIGS.  5  to  7  and  FIGS. 1 and 2 .  
       FIG. 5  is a layout view of an exemplary LCD according to an exemplary embodiment of the present invention, and  FIGS. 6 and 7  are cross-sectional views taken along lines VI-VI and VII-VII in the exemplary LCD shown in  FIG. 5 .  
      Referring to FIGS.  5  to  7 , the liquid crystal panel assembly includes a lower panel  100  and an upper panel  200  that face each other, and a liquid crystal layer  3  that is interposed between the two display panels  100  and  200 .  
      First, the lower panel  100  will be described.  
      A plurality of gate conductors that include a plurality of pairs of first and second gate lines  121   a  and  121   b  and a plurality of storage electrode lines  131  are formed on an insulation substrate  110  such as transparent glass or plastic.  
      The first and second gate lines  121   a  and  121   b  transmit gate signals and extend in a transverse direction, a first direction. The first gate line  121   a  is located above the second gate line  121   b.    
      The first gate line  121   a  has a plurality of first gate electrodes  124   a  projecting downward towards the second gate line  121   b , and a wide end  129  for connection with other layers and the gate driver  400 . The second gate line  121   b  has a plurality of second gate electrodes  124   b  projecting upward towards the first gate line  121   a , and a wide end  129  for connection with other layers and the gate driver  400 . The gate lines  121   a  and  121   b  may extend to be connected to a gate driver  400  that may be integrated on the substrate  110 .  
      The storage electrode lines  131  are supplied with a predetermined voltage, such as a common voltage Vcom, and extend in a transverse direction, the first direction. Each of the storage electrode lines  131  is located between the first gate line  121   a  and the second gate line  121   b . Each of the storage electrode lines  131  includes portions extending in a vertical direction, and includes storage electrodes  137   a  and  137   b  extending from portions of the storage electrode lines  131 . However, the storage electrode lines  131  may have various shapes and arrangements.  
      Each of the gate conductors  121   a ,  121   b , and  131  may be made of an aluminum-based metal such as aluminum (Al) or an aluminum alloy, a silver-based metal such as silver (Ag) or a silver alloy, a copper-based metal such as copper (Cu) or a copper alloy, a molybdenum-based metal such as molybdenum (Mo) or a molybdenum alloy, chromium (Cr), tantalum (Ta), titanium (Ti), and the like. However, the gate conductors may have a multilayer structure that has two or more conductive layers (not shown) whose physical properties are different from each other. In order to reduce signal delay or voltage drop, one of the two conductive layers in a two layer structure is made of a metal having low resistivity, for example, an aluminum-based metal, a silver-based metal, a copper-based metal, and the like, while the other conductive layer is made of materials that are excellent in terms of physical, chemical, and electrical contact characteristics with, particularly, indium tin oxide (“ITO”) and indium zinc oxide (“IZO”), for example, a molybdenum-based metal, chromium, tantalum, titanium and the like. Preferable examples of material configurations of the two conductive layers may include a chromium lower layer and an aluminum (alloy) upper layer, and an aluminum (alloy) lower layer and a molybdenum (alloy) upper layer. However, each of the gate conductors  121   a ,  121   b , and  131  may be made of not only the above-mentioned materials but also various metals or various conductors.  
      The lateral sides of the gate conductors  121   a ,  121   b , and  131  are inclined relative to a surface of the substrate  110 , and the inclination angle thereof ranges about 30 to about 80 degrees.  
      A gate insulating layer  140  that may be made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate conductors  121   a ,  121   b , and  131  and on exposed portions of the insulation substrate  110 .  
      A plurality of first and second semiconductor islands  154   a  and  154   b , which are made of hydrogenated amorphous silicon (“a-Si”) or polysilicon, are formed on the gate insulating layer  140 . The first and second semiconductors  154   a  and  154   b  are disposed on the first and second gate electrodes  124   a  and  124   b.    
      A pair of ohmic contact islands (ohmic contacts)  163   a  and  165   a  are formed on each first semiconductor  154   a , and a pair of ohmic contact islands (not shown) are formed above each second semiconductor  154   b . Each of the ohmic contacts  163   a  and  165   a  may be made of a material, such as n+ hydrogenated a-Si, in which n-type impurities, such as phosphor, are doped with a high concentration, or a material such as silicide.  
      The lateral sides of the semiconductor islands  154   a  and  154   b  and the ohmic contacts  163   b  and  165   b  are inclined relative to the surface of the substrate  110 , and the inclination angles thereof may be in a range of about  30  to about  80  degrees.  
      Data conductors that include a plurality of data lines  171  and a plurality of pairs of first and second drain electrodes  175   a  and  175   b  are formed on the ohmic contacts  163   a  and  165   a  and the gate insulating layer  140 .  
      The data lines  171  transmit data signals, and extend in the longitudinal direction, a second direction substantially perpendicular to the first direction, to intersect the gate lines  121   a  and  121   b  and the storage electrode line  131 . Each of the data lines  171  includes a plurality of pairs of first and second source electrodes  173   a  and  173   b  that extend to the first and second gate electrodes  124   a  and  124   b , and a wide end  179  for connection with other layers or the data driver  500 . The data lines  171  may extend to be connected to a data driver  500  that may be integrated on the substrate  110 .  
      The first and second drain electrodes  175   a  and  175   b  are separated from each other, and are also separated from the data lines  171 . The first/second drain electrode  175   a / 175   b  faces the first/second source electrode  173   a / 173   b  over the first/second gate electrode  124   a / 124   b , and has one wide end  177   a / 177   b  and one rod-shaped end. The wide end  177   a  of the first drain electrode  175   a  is larger in area than the wide end  177   b  of the second drain electrode  175   b . The wide ends  177   a  and  177   b  overlap the storage electrodes  137   a  and  137   b , and portions of the rod-shaped ends of the first and second drain electrodes  175   a  and  175   b  are surrounded with the first and second source electrodes  173   a  and  173   b  that are bent, such as in a “C”.  
      The first/second gate electrodes  124   a / 124   b , the first/second source electrodes  173   a / 173   b , and the first/second drain electrodes  175   a / 175   b  form the first/second TFTs Qa/Qb together with the first/second semiconductors  154   a / 154   b , and channels of the first/second TFTs Qa/Qb are formed in the first/second semiconductors  154   a / 154   b  between the first/second source electrodes  173   a / 173   b  and the first/second drain electrodes  175   a / 175   b . In the illustrated embodiment, the first/second TFTs Qa/Qb are located at the left side of the data lines  171 , however alternate locations would also be within the scope of these embodiments.  
      Each of the data conductors  171 ,  175   a , and  175   b  is preferably made of refractory metals, such as molybdenum, chromium, tantalum, and titanium, or an alloy thereof, or may have a multilayer structure that includes a refractory metal film (not shown) and a conductive layer (not shown) having low resistance. Preferable examples of the multilayer structure may include a double layer having a chromium or molybdenum (alloy) lower layer and an aluminum (alloy) upper layer, and a triple layer having a molybdenum (alloy) lower layer, an aluminum (alloy) intermediate layer, and a molybdenum (alloy) upper layer. However, the data conductors  171 ,  175   a , and  175   b  may be made of not only the above-mentioned materials but also various metals or conductors.  
      The data conductors  171 ,  175   a , and  175   b  have inclined edge profiles, and the inclination angles thereof range about 30 to about 80 degrees with respect to the substrate  110 .  
      The ohmic contacts  163   a  and  165   a  are interposed only between the semiconductors  154   a  and  154   b  that are below the ohmic contacts  163   a  and  165   a  and the data conductors  171 ,  175   a , and  175   b  that are above the ohmic contacts  163   a  and  165   a  so as to lower contact resistance between them. The semiconductors  154   a  and  154   b  include, in addition to regions between the source electrodes  173   a  and  173   b  and the drain electrodes  175   a  and  175   b , portions that are not covered with the data conductors  171 ,  175   a , and  175   b.    
      A passivation layer  180  is formed on the data conductors  171 ,  175   a , and  175   b , and the exposed portions of the semiconductors  154   a  and  154   b , as well as on exposed portions of the gate insulating layer  140 . The passivation layer  180  is made of an inorganic insulator or an organic insulator, and may have a flat surface. Preferably, the organic insulator has a dielectric constant of 4.0 or less, and it may have photosensitivity. However, the passivation layer  180  may have a dual-layer structure including a lower inorganic layer and an upper organic layer, such that it does not damage the exposed portions of the semiconductors  154   a  and  154   b  while sufficiently using the excellent insulating characteristic of an organic film.  
      In the passivation layer  180 , a plurality of contact holes  182 ,  185   a , and  185   b  to which an end  179  of the data line  171  and wide ends  177   a  and  177   b  of the first and second drain electrodes  175   a  and  175   b  are exposed are formed, and in the passivation layer  180  and the gate insulating layer  140 , a plurality of contact holes  181  to which ends  129  of the gate lines  121   a  and  121   b  are exposed are formed.  
      A plurality of pixel electrodes  191  and a plurality of contact assistants  81  and  82  are formed on the passivation layer  180 . Each of the pixel electrodes  191  and the contact assistants  81  and  82  may be made of a transparent conductive material such as ITO or IZO, or a reflective metal such as aluminum, silver, chromium, or an alloy thereof.  
      Each of the pixel electrodes  191  is formed on the lower panel  100 , and faces a color filter CF that each represents one color in a set of colors, such as red (R), green (G), and blue (B). Each pixel electrode  191  has a pair of the first and second subpixel electrodes  191   a  and  191   b  that are separated from each other. The first and second subpixel electrodes  191   a  and  191   b  are adjacent to each other in a column direction, and the first subpixel electrode  191   a  has cutouts  93  and the second subpixel electrode  191   b  has a cutout  91  and  92 . Further, the common electrode  270  that faces the pixel electrodes  191  has a plurality of cutouts  71 ,  72 ,  73 ,  74 , and  75 .  
      Each of the first and second subpixel electrodes  191   a  and  191   b  has at least one parallelogrammic electrode piece  196  as shown in  FIG. 4A  and a parallelogrammic electrode piece  197  as shown in  FIG. 4B . The electrode pieces  196  and  197  shown in  FIG. 4A  and  FIG. 4B  are connected in a horizontal direction to form a basic electrode, and each of the subpixel electrodes  191   a  and  191   b  has a structure based on the basic electrode, as previously described above with respect to  FIGS. 4A and 4B , and thus a detailed description thereof will not be repeated.  
      The first subpixel electrode  191   a  is connected to each first drain electrode  175   a  via the wide end  177   a  through a contact hole  185   a , and the second subpixel electrode  191   b  is connected to each second drain electrode  175   b  via the wide end  177   b  through the contact hole  185   b.    
      The first/second subpixel electrodes  191   a  and  191   b  and the common electrode  270  of the upper panel  200 , and the liquid crystal layer  3  formed between them, form the first/second liquid crystal capacitors Clca/Clcb, and hold an applied voltage even after the TFTs (Qa/Qb) are turned off.  
      The first/second subpixel electrodes  191   a  and  191   b  and the first/second drain electrodes  175   a  and  175   b  that are connected to the first/second subpixel electrodes  191   a  and  191   b  overlap the storage electrode  137  with a gate insulating layer  140  interposed there between so as to form the first/second storage capacitors Csta/Cstb, and the first/second storage capacitors Csta/Cstb reinforce the voltage maintaining capability of the first/second liquid crystal capacitors (Clca/Clcb).  
      The contact assistants  81  and  82  are connected to the ends  129  of the gate lines  121   a  and  121   b  and an end  179  of the data line  171  through the contact holes  181  and  182 . The contact assistants  81  and  82  complement connection between the ends  129  of the gate lines  121   a  and  121   b  and the end  179  of the data line  171 , and an external device, and protect them.  
      Next, the upper panel  200  will be described.  
      A light blocking member  220  is formed on an insulation substrate  210  such as, but not limited to, transparent glass or plastic. The light blocking member  220  may have a bent portion (not shown) that corresponds to a bent edge of each pixel electrode  191 , and a quadrangle portion (not shown) that corresponds to each TFT. The light blocking member  220  prevents light leakage between the pixel electrodes  191  and defines an opening region that faces the pixel electrode  191 .  
      A plurality of color filters  230  are also formed on the substrate  210  and the light blocking member  220 . The color filters  230  mainly exist in a region surrounded by the light blocking member  220 , and may extend to be elongated respectively along a column of the pixel electrodes  191 . Each of the color filters  230  may display one of three colors, such as primary colors, including red, green, and blue.  
      An overcoat  250  is formed on the color filter  230  and the light blocking member  220 . The overcoat  250  may be made of an organic insulator, and prevents the color filter  230  from being exposed and provides a flat surface. Alternatively, the overcoat  250  may be omitted.  
      The common electrode  270  is formed on the overcoat  250 . The common electrode  270  is formed of a transparent conductor, such as ITO, IZO, or the like, and has a plurality of cutouts  71  to  75 .  
      The number of cutouts  71  to  75  may be different according to the design, and the light blocking member  220  may overlap the cutouts  71  to  75  so as to block light leakage near the cutouts  71  to  75 .  
      Alignment layers  11  and  21  may be formed on inner surfaces of the display panels  100  and  200 , and they may be vertical alignment layers.  
      On outer surfaces of the display panel  100  and  200 , polarizers  12  and  22  are provided. Preferably, the polarization axes of the two polarizers  12  and  22  are orthogonal to each other, and form an angle of about 45° with respect to the oblique edges of the subpixel electrodes  191   a  and  191   b . In the case of a reflective LCD, one of the two polarizers  12  and  22  may be omitted.  
      The LCD may include a lighting unit (backlight unit) (not shown) that supplies light to the polarizers  12  and  22 , a phase delay film, the display panels  100  and  200 , and the liquid crystal layer  3 .  
      The liquid crystal layer  3  has negative dielectric anisotropy, and long axes of the liquid crystal molecules of the liquid crystal layer  3  are perpendicular to the surfaces of the two display panels  100 ,  200  in the absence of an electric field.  
      The cutouts  71  to  75  may be substituted with protrusions (not shown) or depressions (not shown). The protrusions may be made of organic materials or inorganic materials, and are disposed above or below the field generating electrodes  191  and  270 .  
      An exemplary operation of the LCD shown in FIGS.  1  to  7  will now be further described.  
      The signal controller  600  receives input image signals R, G, and B and input control signals for controlling display of the input image signals R, G, and B from an external graphic controller (not shown). The input image signals R, G, and B contain luminance information of each pixel PX, and the luminance has grays of the predetermined number, for example 1024 (=2 10 ), 256 (=2 8 ) or 64 (=2 6 ). Examples of the input control signals include a vertical synchronization signal Vsync, a horizontal synchronizing signal Hsync, a main clock signal MCLK, a data enable signal DE, and the like.  
      The signal controller  600  appropriately processes the input image signals R, G, and B according to the operation conditions of the liquid crystal panel assembly  300  and the data driver  500  on the basis of the input image signals R, G, and B and input control signals, generates a gate control signal CONT 1 , a data control signal CONT 2 , and the like so as to transmit the gate control signal CONT 1  to the gate driver  400 , and outputs the data control signal CONT 2  and the processed image signal DAT to the data driver  500 . The output image signals DAT are digital signals having a predetermined number of values (or grays).  
      The gate control signal CONT 1  includes a scanning start signal STV that instructs a scanning start operation and at least one clock signal that controls an output cycle of the gate-on voltage Von. The gate control signal CONT 1  may further include an output enable signal OE that defines a duration time of the gate-on voltage Von.  
      The data control signal CONT 2  includes a horizontal synchronization start signal STH that instructs a transmission start of image data operation for a group of pixels PX, a load signal LOAD that instructs application of a data signal Vd to the liquid crystal panel assembly  300 , and a data clock signal HCLK. The data control signal CONT 2  may further include an inversion signal RVS that inverts a voltage polarity of a data signal Vd for the common voltage Vcom (hereinafter, “a voltage polarity of a data signal for the common voltage” is simply referred to as polarity of “a data signal”).  
      In accordance with the data control signal CONT 2  supplied by the signal controller  600 , the data driver  500  receives digital image signals DAT for a group of pixels, selects gray voltages corresponding to the respective digital image signals DAT, converts the digital image signals DAT into analog data signals Vd, and applies the converted signals to the corresponding data lines  171 .  
      In accordance with the gate control signal CONT 1  supplied by the signal controller  600 , the gate driver  400  applies the gate-on voltage Von to the gate lines  121   a  and  121   b , and turns on switching elements Qa and Qb that are connected to the gate lines  121   a  and  121   b . Then, the data signal Vd supplied to the data line  171  is applied to the corresponding subpixels PXa and PXb through the switching elements Qa and Qb that are turned on.  
      If a potential difference is generated across the first and second liquid crystal capacitors Clca and Clcb, a primary electric field that is substantially vertical to the surfaces of the display panels  100  and  200  is generated in the liquid crystal layer  3 . (Hereinafter, the pixel electrodes  191  and the common electrode  270  are referred to as “field generating electrodes”.) Then, long axes of the liquid crystal molecules of the liquid crystal layer  3  are perpendicular to a direction in which an electric field is applied in response to the applied electric field, the variation of the polarization of the light incident on the liquid crystal layer  3  is different according to the inclination of the liquid crystal molecules. When the polarization varies, the transmittance is changed by the polarizers  12  and  22 , and thus the LCD displays images.  
      Tilt angles of the liquid crystal molecules within the liquid crystal layer  3  depend on the intensity of the electric field. Since the voltages of the two liquid crystal capacitors Clca and Clcb are different from each other, the tilt angles of the liquid crystal molecules within the liquid crystal layer  3  are different. As a result, luminance is different in the two subpixels PXa and PXb. Accordingly, if the voltage of the first liquid crystal capacitor Clca and the voltage of the second liquid crystal capacitor Clcb are appropriately adjusted, an image in a lateral view may be maximally close to an image in a front view, that is, a lateral gamma curve may be maximally close to a front gamma curve, and thus lateral visibility may be improved.  
      Further, if the area of the first subpixel electrode  191   a  applied with a high voltage is made to be smaller than the area of the second subpixel electrode  191   b , the lateral gamma curve can be made to be closer to the front gamma curve, and thus lateral visibility can be improved. In particular, within exemplary embodiments of the present invention, in one pixel electrode group, the width and the height of each of the subpixel electrodes  191   a  and  191   b  may be freely adjusted. Therefore, an area ratio between the first subpixel electrode  191   a  and the second subpixel electrodes  191   b  may be freely adjusted.  
      Tilt directions of the liquid crystal molecules within the liquid crystal layer  3  are primarily determined according to horizontal components obtained by distorting the primary electric field by the cutouts  71  to  75  and  91  to  93  of the field generating electrodes  270  and  191 , respectively, and the edges of the subpixel electrodes  191   a  and  191   b . The horizontal component of this primary electric field is substantially vertical to the edges of the cutouts  71  to  75  and  91  to  93  and the edges of the subpixel electrodes  191   a  and  191   b.    
      The subpixels PXa and PXb are divided into a plurality of sub-areas by the cutouts  71  to  75  and  91  to  93 , and each of the sub-areas has two major edges that are defined by bent portions of the cutouts  71  to  75  and  91  to  93  and the bent edges of the subpixel electrodes  191   a  and  191   b . The liquid crystal molecules in each sub-area are tilted in directions vertical to the major edges, that is, in substantially four directions. As such, as the tilt directions of liquid crystal molecules are diversified, a reference viewing angle of the LCD is increased.  
      Meanwhile, a direction of a secondary electric field that is generated by the voltage difference between the subpixel electrodes  191   a  and  191   b  is vertical to the major edges of the sub-areas. Therefore, a direction of the secondary electric field is equal to a direction of the horizontal component of the primary electric field. As a result, the secondary electric field between the subpixel electrodes  191   a  and  191   b  determines a tilt direction of the liquid crystal molecules within the liquid crystal layer  3 .  
      The above-described processes are repeated in a unit of one horizontal period (also referred to as “1H” that is equal to a cycle of each of a horizontal synchronizing signal Hsync and a data enable signal DE), and data signals Vd are applied to all pixels PX, thereby displaying images of one frame.  
      After one frame is completed, a next frame starts, and an inversion signal RVS applied to the data driver  500  is controlled such that the polarity of a data signal Vd applied to each pixel PX is opposite to that of the previous frame (“frame inversion”). At this time, in one frame, the polarity of a data signal Vd flowing through one data line  171  is changed according to characteristic of the inversion signal RVS (for example: row inversion and dot inversion), or polarities of data signals Vd applied to one group of pixels PX may be different (for example: column inversion and dot inversion).  
      Hereinafter, a liquid crystal assembly according to another exemplary embodiment of the present invention will be described with reference to  FIGS. 8 and 9  and  FIGS. 1 and 2 .  
       FIG. 8  is an equivalent circuit diagram of one exemplary pixel in an exemplary liquid crystal panel according to another exemplary embodiment of the present invention.  
      Referring to  FIG. 8 , the liquid crystal panel assembly includes a plurality signal lines that include a plurality of gate lines GL, a plurality of pairs of data lines DLa and DLb, and a plurality of storage electrode lines SL, and a plurality of pixels PX that are connected to the signal lines.  
      Each of the pixels PX has a pair of subpixels PXa and PXb, and each of the subpixels PXa/PXb has a switching element Qa/Qb that is connected to a corresponding gate line GL and a corresponding data line DLa/DLb, a liquid crystal capacitor Clca/Clcb that is connected to the switching element Qa/Qb, and a storage capacitor Csta/Cstb that is connected to the switching element Qa/Qb and the storage electrode line SL.  
      Each of the switching elements Qa/Qb also corresponds to a three-terminal element, such as a TFT, that is included in the lower panel  100 , and has a control terminal, such as a gate electrode, connected to a gate line GL, an input terminal, such as a source electrode, connected to a data line DLa/DLb, and an output terminal, such as a drain electrode, connected to the liquid crystal capacitor Clca/Clcb and the storage capacitor Csta/Cstb.  
      The operation of the LCD that includes the liquid crystal capacitors Clca and Clcb, the storage capacitors Csta and Cstb, and the liquid crystal panel assembly is substantially the same as that in the LCD according to the above-described exemplary embodiment, and thus a detailed description thereof will be omitted. In the LCD shown in FIGS.  3  to  7 , the two subpixels PXa and PXb that form one pixel PX are applied with a data voltage with a time difference there between, while in the present exemplary embodiment shown in  FIGS. 8 and 9 , the two subpixels PXa and PXb are applied with the data voltage at the same time.  
      An example of the liquid crystal panel assembly shown in  FIG. 8  will now be further described with reference to  FIG. 9 .  
       FIG. 9  is a layout view of an exemplary liquid crystal panel assembly according to another exemplary embodiment of the present invention.  
      As shown in  FIG. 9 , the liquid crystal panel assembly includes a lower panel  100  and an upper panel  200  that face each other, a liquid crystal layer  3  that is formed between the two display panels  100 ,  200 , and a pair of polarizers (not shown) that adhere to external surfaces of the display panels  100  and  200 .  
      A layered structure of the liquid crystal panel assembly according to the exemplary embodiment of  FIGS. 8 and 9  is substantially the same as a layered structure of the liquid crystal panel assembly shown in FIGS.  5  to  7 .  
      The lower panel of the illustrated embodiment of  FIGS. 8 and 9  will now be described. On the insulation substrate (not shown), a plurality of gate conductors that include a plurality of gate lines  121  and a plurality of pairs of first and second storage electrode lines  131   a  and  131   b  are formed. Each of the gate lines  121  has a plurality of pairs of first and second gate electrodes  124   a  and  124   b , and an end  129 . The first and second gate electrodes  124   a  and  124   b  may extend in opposite directions from the gate lines  121 . The storage electrode lines  131   a  and  131   b  have a plurality of storage electrodes  137   a  and  137   b . Each of the storage electrodes  137   a  and  137   b  may extend in both directions from the storage electrode lines  131   a  and  131   b , respectively. On the gate conductors  121 ,  131   a , and  131   b  and the insulation substrate, a gate insulating layer (not shown) is formed. On the gate insulating layer, a plurality of semiconductor islands  154   a  and  154   b  are formed, and on the plurality of semiconductor islands  154   a  and  154   b , ohmic contacts (not shown) are formed. On the ohmic contacts, data conductors that include a plurality of pairs of first and second data lines  171   a  and  171   b  and a plurality of first and second drain electrodes  175   a  and  175   b  are formed. The first and second data lines  171   a  and  171   b  include a plurality of first and second source electrodes  173   a  and  173   b  and ends  179   a  and  179   b , and the first and second drain electrodes  175   a  and  175   b  include extending portions  177   a  and  177   b . On the data conductors  171   a ,  171   b ,  175   a , and  175   b , exposed portions of the semiconductors  154   a  and  154   b , and the gate insulating layer, a passivation layer (not shown) is formed, and a plurality of contact holes  181 ,  182   a ,  182   b ,  185   a , and  185   b  are formed in the passivation layer and the gate insulating layer. A plurality of pixel electrodes  191  that include the first and second subpixel electrodes  191   a  and  191   b  and a plurality of contact assistants  81 ,  82   a , and  82   b  are formed on the passivation layer. The first and second subpixel electrodes  191   a  and  191   b  have structures including the parallelogrammic electrode pieces  196 ,  197  shown in  FIGS. 4A and 4B , as in the liquid crystal panel shown in  FIG. 5 . The first subpixel electrode  191   a  is provided a cutout  93 , and the second subpixel electrode  191   b  is provided with cutouts  91  and  92  An alignment layer (not shown) is formed on the pixel electrodes  191 , the contact assistants  81 ,  82   a , and  82   b , and the passivation layer.  
      The upper panel  200  will now be described. On an insulation substrate, a light blocking member, a plurality of color filters, an overcoat, a common electrode having cutouts  71 ,  72 ,  73 ,  74 , and  75 , and an alignment layer are formed.  
      However, in the liquid crystal panel assembly according to the illustrated embodiment of  FIGS. 8 and 9 , as compared with the liquid crystal panel assembly shown in FIGS.  5  to  7 , the number of gate lines  121  is half, and the number of data lines  171   a  and  171   b  is double. In addition, according to the illustrated embodiment of FIGS.  8  and  9 , the first and second TFTs Qa and Qb that are connected to the first and second subpixel electrodes  191   a  and  191   b  for forming one pixel electrode  191  are connected to the same gate line  121  and different data lines  171   a  and  171   b.    
      The first and second TFTs Qa and Qb are located at the left side or the right side of the first and second data lines  171   a  and  171   b.    
      A variety of characteristics of the liquid crystal panel assembly shown in FIGS.  5  to  7  may be applied to the liquid crystal panel assembly shown in  FIGS. 8 and 9 .  
      Next, a liquid crystal panel assembly according to another exemplary embodiment of the present invention will be described with reference to  FIGS. 10 and 11  and  FIGS. 1 and 2 .  
       FIG. 10  is an equivalent circuit diagram of one exemplary pixel in an exemplary liquid crystal panel assembly according to another exemplary embodiment of the present invention.  
      Referring to  FIG. 10 , the liquid crystal panel assembly includes signal lines that include a plurality of gate lines GL and a plurality of data lines DL, and a plurality of pixels PX that are connected to the signal lines.  
      Each of the pixels PX has a pair of first and second subpixels PXa and PXb, and a coupling capacitor Ccp that is connected between the two subpixels PXa and PXb.  
      The first subpixel PXa has a switching element Q that is connected to a corresponding gate line GL and a corresponding data line DL, and a first liquid crystal capacitor Clca and a storage capacitor Csta that are connected to the switching element Q. The second subpixel PXb has a second liquid crystal capacitor Clcb that is connected to a coupling capacitor Ccp that connects the second subpixel PXb to the first subpixel PXa.  
      The switching element Q also corresponds to a three-terminal element such as a TFT that is included in the lower panel  100 , and has a control terminal, such as a gate electrode, connected to a gate line GL, an input terminal, such as a source electrode, connected to a data line DL, and an output terminal, such as a drain electrode, connected to a liquid crystal capacitor Clca, a storage capacitor Csta, and a coupling capacitor Ccp.  
      In accordance with the gate signal supplied through the gate line GL, the switching element Q applies a data voltage supplied through the data line DL to the first liquid crystal capacitor Clca and the coupling capacitor Ccp, and the coupling capacitor Ccp changes an amplitude of the data voltage and applies the changed voltage to the second liquid crystal capacitor Clcb.  
      If the storage capacitor Csta is applied with a common voltage Vcom and the capacitors Clca, Csta, Clcb, and Ccp and capacitances thereof are denoted by the same reference indicia, the relationship between the voltage Va charged in the first liquid crystal capacitor Clca and the voltage Vb charged in the second liquid crystal capacitor Clcb is as follows. 
 
 Vb=Va×[Ccp /( Ccp+Clcb )]  [Equation 1]
 
      Since a value of Ccp/(Ccp+Clcb) is smaller than 1, the voltage Vb charged in the second liquid crystal capacitor Clcb is always smaller than the voltage Va charged in the first liquid crystal capacitor Clca. The relationship is realized even if the voltage applied to the storage capacitor Csta is not the common voltage Vcom.  
      An appropriate ratio between the voltage Va of the first liquid crystal capacitor Clca and the voltage Vb of the second liquid crystal capacitor Clcb can be obtained by adjusting a capacitance of the coupling capacitor Ccp.  
      An example of the liquid crystal panel assembly of  FIG. 10  will now be further described with reference to  FIG. 11 .  
       FIG. 11  is a layout view of an exemplary liquid crystal panel assembly according to another exemplary embodiment of the present invention.  
      Referring to  FIG. 11 , the liquid crystal panel assembly according to the present exemplary embodiment includes a lower panel  100  and an upper panel  200  that face each other, a liquid crystal layer  3  that is interposed between the two display panels  100 ,  200 , and a pair of polarizers (not shown) that adhere to external surfaces of the display panels  100  and  200 .  
      A layered structure of the liquid crystal panel assembly according to the illustrated embodiment of  FIG. 11  is substantially the same as that of the liquid crystal panel assembly shown in FIGS.  5  to  7 .  
      The lower panel  100  will now be described. On the insulation substrate (not shown), a plurality of gate conductors that include a plurality of gate lines  121  and a plurality of storage electrode lines  131  are formed. Each of the gate lines  121  has a plurality of gate electrodes  124  and an end  129 . A gate insulating layer (not shown) is formed on the gate lines  121  and on the insulation substrate. On the gate insulating layer, a plurality of semiconductor islands  154  are formed, and a plurality of ohmic contact islands (not shown) are formed on the plurality of semiconductor islands  154 . Data conductors that include a plurality of data lines  171  and a plurality of drain electrodes  175  are formed on the ohmic contacts and the gate insulating layer. Each of the data lines  171  has a plurality of source electrodes  173  and an end  179 . A passivation layer (not shown) is formed on the data conductors  171  and  175  and exposed portions of the semiconductors  154 , and a plurality of contact holes  181 ,  182 , and  185  are formed in the passivation layer and the gate insulating layer. A plurality of pixel electrodes  191  that include the first and second subpixel electrodes  191   a  and  191   b  and a plurality of contact assistants  81  and  82  are formed on the passivation layer. Cutouts  91  and  92  are formed on the second subpixel electrode  191   b , and a cutout  93  is formed on the first subpixel electrode  191   a . An alignment layer (not shown) is formed on the pixel electrode  191 , the contact assistants  81  and  82 , and the passivation layer.  
      The upper panel  200  will now be described. On an insulation substrate, a light blocking member, a plurality of color filters, an overcoat, a common electrode having cutouts  71 ,  72 ,  73 ,  74 , and  75 , and an alignment layer are sequentially formed.  
      In the liquid crystal panel assembly according to the exemplary embodiment of  FIGS. 10 and 11 , as compared with the liquid crystal panel assembly shown in FIGS.  5  to  7 , the number of gate lines  121  is half, and only one TFT Q exists per pixel electrode  191 .  
      The drain electrode  175  that forms the TFT Q includes a rod-shaped end, first and second extension portions  176  and  177 , and a connection portion that connects the two extension portions  176  and  177 . Hereinafter, the second extension portion  177  is referred to as a “coupling electrode”. The first subpixel electrode  191   a  is connected to the drain electrode  175  through a contact hole  185  to which the first extension portion  176  of the drain electrode  175  is exposed. The coupling electrode  177  is overlapped by the second subpixel electrode  191   b  so as to form a coupling capacitor Ccp.  
      A variety of characteristics of the liquid crystal panel assembly shown in FIGS.  5  to  7  may be applied to the liquid crystal panel assembly shown in  FIGS. 10 and 11 .  
      A liquid crystal panel assembly according to another exemplary embodiment of the present invention will be described with reference to  FIGS. 12 and 13 , and  FIGS. 1 and 2 .  
       FIG. 12  is an equivalent circuit diagram of one exemplary pixel in an exemplary LCD according to another exemplary embodiment of the present invention.  
      Referring to  FIG. 12 , the liquid crystal panel assembly includes lower and upper panels  100  and  200  that face each other, a liquid crystal layer  3  that is interposed between the lower and upper panels  100  and  200 , and a pair of polarizers (not shown) that adhere to external surfaces of the display panels  100  and  200 .  
      On the lower panel  100 , signal lines that include a plurality of gate lines GL, a plurality of data lines DL, and a plurality of storage electrode lines SL are provided. Each of the pixels has a switching element Q, a liquid crystal capacitor Clc that is connected to the switching element Q, and a storage capacitor Cst that is connected to the switching element Q and the storage electrode line SL.  
      The switching element Q also corresponds to a three-terminal element such as a TFT that is included in the lower panel  100 , and has a control terminal, such as a gate electrode, connected to the gate line GL, an input terminal, such as a source electrode, connected to the data line DL, and an output terminal, such as a drain electrode, connected to the liquid crystal capacitor Clc and the storage capacitor Cst.  
      The liquid crystal capacitor Clc uses a pixel electrode PE of the lower panel  100  and a common electrode CE of the upper panel  200  as two terminals. The liquid crystal layer  3  that is interposed between the common electrode CE and the pixel electrode PE serves as a dielectric material. The common electrode CE is formed on the entire surface, or substantially the entire surface, of the upper panel  200 , and is applied with a common voltage Vcom. The liquid crystal layer  3  has negative dielectric anisotropy, and the liquid crystal molecules of the liquid crystal layer  3  may be aligned such that long axes thereof are perpendicular to the surfaces of the two display panels  100 ,  200  in the absence of an electric field.  
      The operation of the LCD shown in  FIG. 12  that includes the storage capacitor Cst and the liquid crystal panel assembly is substantially the same as that of the LCD according to the above-described exemplary embodiment, and thus a detailed description thereof will be omitted. However, in the LCD shown in  FIG. 12 , one pixel PX is not divided into two electrodes, but is constructed as one electrode.  
      An example of the liquid crystal panel assembly shown in  FIG. 12  will now be described with reference to  FIG. 13 .  
       FIG. 13  is a layout view of an exemplary liquid crystal panel assembly according to an exemplary embodiment of the present invention.  
      Referring to  FIG. 13 , the liquid crystal assembly includes a lower panel  100  and an upper panel  200  that face each other, and a liquid crystal layer  3  that is interposed between the two display panels  100  and  200 .  
      A layered structure of the liquid crystal panel assembly illustrated in  FIG. 13  is substantially the same as that of the liquid crystal panel assembly in FIGS.  5  to  7 .  
      The lower panel  100  will now be described. On the insulation substrate (not shown), a plurality of gate conductors that include a plurality of gate lines  121  and a plurality of storage electrode lines  131  are formed. Each of the gate lines  121  has a gate electrode  124  and an end  129 , and each of the storage electrode lines  131  has a storage electrode  137 . A gate insulating layer (not shown) is formed on the gate conductors  121  and  131  and on the insulation substrate. A plurality of semiconductors  154  are formed on the gate insulating layer, and a plurality of ohmic contacts (not shown) are formed on the plurality of semiconductors  154 . Data conductors that include a plurality of data lines  171  and a plurality of drain electrodes  175  are formed on the ohmic contacts and the gate insulating layer. Each data line  171  has a plurality of source electrodes  173  and an end  179 , and each drain electrode  175  has a wide end  177 . A passivation layer  180  is formed on the data conductors  171  and  175 , the exposed portions of the semiconductors  154 , and the gate insulating layer, and a plurality of contact holes  181 ,  182 , and  185  are formed in the passivation layer and the gate insulating layer. On the passivation layer, a plurality of pixel electrodes  191  and a plurality of contact assistants  81  and  82  that are connected to the wide ends  177  of the drain electrodes  175  and the ends  121  and  179  of the gate lines  121  and the data lines  171 , respectively, are formed. Each pixel electrode  191  is provided with cutouts  91 ,  92 ,  93 , and  94 . An alignment layer (not shown) is formed on the pixel electrodes  191 , the contact assistants  81  and  82 , and the passivation layer.  
      The upper panel  200  will now be described. On an insulation substrate, a light blocking member, a plurality of color filters, an overcoat, a common electrode having cutouts  71 ,  72 ,  73 ,  74 , and  75 , and an alignment film are formed.  
      In the liquid crystal panel assembly according to the present exemplary embodiment, as compared with the liquid crystal panel assembly shown in FIGS.  5  to  7 , the storage electrode  137  expands in a vertical direction in the storage electrode line  131 , having a width extending in a direction of the data line  171 , such that it is elongated parallel to the gate line  121 , having a length extending in a direction of the gate line  121 , such that it can be connected to the neighboring pixel electrode  191 .  
      Further, the pixel electrode  191  is not divided into two electrodes, but is constructed as one electrode. Accordingly, the same voltage is applied to all of the pixel electrodes  191 .  
      A variety of characteristics of the liquid crystal panel assembly shown in  FIGS. 10 and 11  are applicable to the liquid crystal panel assembly shown in  FIGS. 12 and 13 .  
      A method of improving lateral visibility in an LCD is thus made possible using the above-described exemplary embodiments. The method may include forming gate lines in a first direction on a substrate, forming data lines in a second direction on the substrate, and forming at least one pixel electrode per pixel area on the substrate, the at least one pixel electrode having a substantially simple concave hexagon shape formed in an arrow shape with one concavity, the arrow shape pointing in the second direction. Forming the at least one pixel electrode per pixel area may include forming first and second subpixel electrodes per pixel area, each of the first and second subpixel electrodes having a substantially simple concave hexagon shape formed in an arrow shape with one concavity, the arrow shape pointing in the second direction, the second subpixel electrodes nesting within concavities of adjacent first pixel electrodes, and the first subpixel electrodes nesting within concavities of adjacent second subpixel electrodes. Forming the at least one pixel electrode per pixel area may also include forming first and second subpixel electrodes per pixel area and forming an area of the first subpixel electrodes smaller than an area of the second subpixel electrodes, and the method may further include applying a larger voltage via the data lines to the first subpixel electrodes than to the second subpixel electrodes.  
      According to the present invention, lateral visibility of the LCD may be improved by a simple structure of a pixel, and a pixel region may be easily formed.  
      While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.