Abstract:
A thin film transistor (TFT) substrate that is capable of providing a wide viewing angle and high contrast ratio without a decrease is aperture ratio is presented. The TFT substrate may be, for example, used with a patterned vertical alignment (PVA) mode LCD. The TFT substrate includes gate lines and data lines extending in non-parallel directions and a pixel electrode formed in a pixel region. The pixel region has two transmission regions separated from each other by a reflection region, and at least one of the gate lines is formed in the reflection region. A storage capacitor may also be formed in the reflection region. This configuration avoids the use of a bridge region between the two transmission regions that is responsible for aperture ratio decrease in the conventional configuration.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
       [0001]    This application claims priority from Korean Patent Application No. 10-2006-0112859 filed on Nov. 15, 2006, the content of which is incorporated by reference herein in its entirety. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of Invention 
         [0003]    The present invention relates to a liquid crystal display, and more particularly to a transflective liquid crystal display capable of reducing an aperture loss of a transmission region by forming a reflection region at a center of a pixel region. 
         [0004]    2. Description of the Prior Art 
         [0005]    A liquid crystal display (LCD) comprises a thin film transistor (TFT) substrate having pixel electrodes formed thereon, a color filter substrate having a common electrode formed thereon, and a liquid crystal layer interposed between the two substrates. The LCD displays an image by controlling the alignment of liquid crystal molecules, which is done by applying voltages to the pixel electrode and the common electrode. The amount of light transmitted through a liquid crystal layer is adjusted by the alignment of the LC molecules. 
         [0006]    Since an LCD is not self-luminescent, light is supplied from the outside to form an image. LCDs are classified into transmissive, reflective and transflective types according to the type of light source. The transmissive LCD displays an image using a backlight positioned in the rear of an LCD panel, and the reflective LCD displays an image using ambient light. The transflective LCD, which is a combination of the transmissive and reflective LCDs, operates in a transmission mode when an image is displayed using a backlight unit incorporated into the LCD device when the amount of ambient light is insufficient to display the image of the desired quality and luminescence. The transflective LCD, however, operates in a reflection mode when there is enough ambient light. The transflective LCD is used for medium- and small LCDs. In the transflective LCD, a portion of a pixel region defines a transmission region, and the other portion of the pixel region defines a reflective region. 
         [0007]    A vertical alignment mode LCD, in which the major axes of liquid crystal molecules are aligned vertically with respect to the TFT and color filter substrates in the absence of an electric field, has been receiving much attention because of its ability to achieve high contrast ratio and a wide viewing angle. In order to realize the wide viewing angle in the vertical alignment mode LCD, there is a method of forming a cut-away pattern or a projection on an electrode. According to such a method, a fringe field is formed and the directions in which liquid crystals are inclined are uniformly distributed, thereby securing a wide viewing angle. Particularly, a PVA (Patterned Vertical Alignment) mode, in which a cut-away pattern is formed on an electrode, has been recognized as a wide viewing angle technology with which an IPS (In Plane Switching) mode can be replaced. 
         [0008]    In a transflective PVA LCD, in which the transflective and PVA modes are combined, and which is employed in medium and small products such as mobile phones, a transmission region is formed in a portion of a pixel region defined at an intersection region of gate and data lines, a reflection region is formed in the other portion of the pixel region, and a cut-away pattern is formed in the transmission region. In the transflective PVA LCD used for such medium and small products, the reflection region is formed in a gate line side of the pixel region with a TFT formed thereon, and the other portion of the pixel region is formed as the transmission region. However, if the transmission region is larger than the reflection region, the transmission region cannot be formed with a single domain due to the characteristics of the medium and small transflective PVA LCD. So, the transmission region is divided into two regions. In order to operate the LCD in a PVA mode by dividing the transmission region into two regions, the divided domains are spaced apart from each other. This configuration can be problematic in that it reduces the aperture ratio by the distance between the divided domains. Further, the two domains are bridged, and the liquid crystals in the bridge region are irregularly aligned so that no image is displayed in the bridge region. This reduction in the aperture ratio in the bridge region is undesirable. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention is conceived to solve the aforementioned problems in the prior art. Accordingly, the present invention provides a thin film transistor (TFT) substrate capable of enhancing the aperture ratio, a method of manufacturing the same and a liquid crystal display (LCD) having the same. 
         [0010]    The present invention is to provide a TFT substrate, in which a reflection region is formed at a central portion of a pixel region and a transmission region is formed symmetrically with respect to the reflection region to remove a bridge in the transmission region and thus reduce the aperture loss of the transmission region, a method of manufacturing the same and an LCD having the same. 
         [0011]    The present invention is to provide a TFT substrate, capable of enhancing an aperture ratio by positioning gate and storage lines in a reflection region formed at a central portion of a pixel region, a method of manufacturing the same and an LCD having the same. 
         [0012]    In one aspect, the present invention includes a TFT substrate that includes a plurality of gate lines extending in a first direction on an insulation substrate; a plurality of data lines extending in a second direction that is non-parallel to the first direction; and a pixel electrode formed in a pixel region between the data lines. The pixel region has transmission regions separated from each other by a reflection region, and at least one of the gate lines is formed in the reflection region. 
         [0013]    In another aspect, the present invention is a a method of manufacturing a TFT substrate that includes forming an active layer and a first electrode pattern by forming a semiconductor layer on a substrate and patterning the semiconductor layer; forming gate lines and a second electrode pattern by forming a gate insulation film and a first conductive layer on the substrate and patterning the first conductive layer; forming a first protection film on the substrate, forming a first contact hole that extends through the first protection film to the active layer; forming data lines by forming a second conductive layer on the substrate and patterning the second conductive layer to be connected to a portion of the active layer through the first contact hole; forming a second contact hole that extends through the second protection film to the active layer; forming a pixel electrode by forming a third conductive layer on the substrate and patterning the third conductive layer to be connected to a portion of the active layer through the second contact hole; and forming a reflection film on the pixel electrode. 
         [0014]    In yet another aspect, the present invention is a liquid crystal display that includes the above-described TFT substrate, a color filter substrate, and a liquid crystal layer interposed between the TFT and color filter substrates. The color filter substrate includes a second insulation substrate having a first region that does not overlap the pixel region when the color filter substrate is aligned witht eh TFT substrate and a second region that overlaps the pixel region when the color filter substrate is aligned with the TFT substrate, a black matrix formed in the first region, a color filter formed in the second region, and a common electrode formed on the second insulation substrate. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    The above and other objects, features and advantages of the present invention will become apparent from the following description of a preferred embodiment given in conjunction with the accompanying drawings, in which: 
           [0016]      FIG. 1  is a plan view of a liquid crystal display according to the present invention; 
           [0017]      FIG. 2  is a sectional view taken along the line I-I′ in  FIG. 1 ; 
           [0018]      FIG. 3  is a sectional view taken along the line II-II′ in  FIG. 1 ; and 
           [0019]      FIGS. 4 to 8  are plan and sectional views sequentially illustrating a method of manufacturing a thin film transistor substrate according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0020]    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments and may be embodied in different forms. These embodiments are provided only for illustrative purposes and a full understanding of the scope of the present invention by those skilled in the art. 
         [0021]    In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and like reference numerals are used to designate like elements throughout the specification and drawings. Further, the expression that an element such as a layer, region, substrate or plate is placed on or above another element includes not only a case where a first element is placed directly on or just above a second element but also a case where a third element is interposed between the first element and the second element. 
         [0022]      FIG. 1  is a plan view showing a pixel region of a transflective PVA liquid crystal display (LCD) according to the present invention,  FIG. 2  is a sectional view taken along the line I-I′ in  FIG. 1 , and  FIG. 3  is a sectional view taken along the line II-II′ in  FIG. 1 . 
         [0023]    An LCD panel  300  includes a thin film transistor (TFT) substrate  100  and a color filter substrates  200 , having a liquid crystal layer (not shown) interposed between them. 
         [0024]    The TFT substrate  100  comprises an active layer  110  formed on a first insulation substrate  111 , a first electrode pattern  115  formed to be connected to a portion of the active layer  110 , a plurality of gate lines  120  formed to extend in one direction, a second electrode pattern  130  extending parallel to the gate lines  120  to overlap with the first electrode pattern  115 , a plurality of data lines  140  formed to extend in the direction perpendicularly intersecting the gate lines  120 , and a pixel electrode  150  formed in a pixel region A between the data lines  140 . As shown, the pixel region A has three regions: a reflection region B between transmission regions C 1  and C 2 . That is, the reflection region B is defined at the central portion of the pixel region A including a region in which the gate line  120  and the second electrode pattern  130  are formed, and the transmission regions C 1  and C 2  are symmetrically formed with respect to the reflection region B in parts of the pixel region A that is not occupied by the reflection region B. In addition, a reflection film  170  is formed on a surface of the pixel electrode  150  that is formed in the reflection region B, preferably having an area larger than the pixel electrode  150  in the reflection region B. A cut-away portion  180  is further formed in the shape of a circle, preferably in the pixel electrode  150  at each central portion of the transmission regions C 1  and C 2 . Here, it is preferred that an upper surface of the reflection film  170  formed in the reflection region B be curved so that a reflection surface extends. The reflection region B and the two transmission regions C 1  and C 2  of the pixel region A are defined by the pixel electrode  150 , which is divided into sub-electrodes  150 C 1 ,  150 B, and  150 C 2  spaced apart from each other by a predetermined interval. 
         [0025]    The active layer  110  is formed to extend from a region under the data line  140  to a region of the first electrode pattern  115  such that the active layer  110  partially overlaps the data line  140  and the gate line  120 . Further, the active layer  110  is connected to the data line  140  through a first contact hole  190 , and connected to the pixel electrode  150  through a second contact hole  195 . Furthermore, the active layer  110  is formed of a low-temperature polysilicon thin film. The region connected to the data line  140  through the first contact hole  190  functions as a source region  110   s , a region connected to the pixel electrode  150  through the second contact hole  195  functions as a drain region  110   d , and the other region except the source and drain regions  110   s  and  110   d  functions as a channel region  110   c . Thus, impurity ions are implanted into the regions that will function as the source and drain regions  110   s  and  110   d  of a low-temperature polysilicon thin film. Further, the gate line  120  passing a top of the channel region  110   c  functions as a gate electrode. Accordingly, a TFT is configured. 
         [0026]    The first electrode pattern  115 , which functions as a lower electrode of a storage capacitor, may be formed in the shape of a rectangle, and simultaneously formed with the active layer  110  of a low-temperature polysilicon thin film. Further, the first electrode pattern  115  is formed to be connected to the drain region  110   d  of the active layer  110 . 
         [0027]    The gate lines  120  extend in a first direction and are spaced apart from one another at a predetermined interval. Further, the gate line  120  is insulated from the active layer  110  formed below the gate line  120  by a gate insulation layer  117 . 
         [0028]    The second electrode pattern  130  functions as an upper electrode of a storage capacitor. Preferably, the second electrode pattern  130  is formed simultaneously with the gate line  120  and overlaps the first electrode pattern except in a region where the second contact hole  195  will be formed. The second electrode pattern  130 , the first electrode pattern  115  and the gate insulation layer  117  interposed therebetween constitute the storage capacitor. 
         [0029]    The first protection film  135  is formed over an entire top surface of the first insulation substrate  111  including the gate line  120 , and may be formed of an inorganic material, such as silicon nitride or oxide, or an organic insulation material with a low dielectric constant. The first protection film  135  may be formed to have a double-layered structure of an inorganic insulation layer and an organic insulation layer. 
         [0030]    The first contact hole  190  is formed by partially removing the first protection film  135  and the gate insulation film  117  such that the source region  110   s  of the active layer is at the base of the first contact hole  190 . 
         [0031]    The data line  140  extends in the direction perpendicularly intersecting the gate line  120 , and the data line  140  is connected to the source region  110   s  through the first contact hole  190 . Accordingly, the data line  140  also functions as a source electrode. 
         [0032]    A second protection film  145  is formed over an entire top surface of the first insulation substrate  111  including the data line  140 . Like the first protection film  135 , the second protection film  145  may be formed of an inorganic material such as silicon nitride or oxide, or an organic insulation material with a low dielectric constant. As in the first protection film  135 , the second protection film  145  may be formed to have a double-layered structure of an inorganic insulation film and an organic insulation film. Further, an upper surface of the second protection film  145  is preferably curved in the reflection region B, and may be curved in the transmission regions C 1  and C 2 . 
         [0033]    The second contact hole  195  is formed by partially removing the second protection film  145 , the first protection film  135  and the gate insulation film  117  such that the drain region  110   d  of the active layer  110  is at the base of the second contact hole  195 . 
         [0034]    The pixel electrode  150  is formed in the pixel region A between the data lines  140 . The pixel electrode  150  is divided into the three sub-electrodes  150 C 1 ,  150 B,  150 C 2  (collectively sub-electrodes  150 ) in the shape of a rectangle with rounded corners. The sub-electrodes  150 C 1 ,  150 B,  150 C 2  are respectively formed in the reflection region B and the transmission regions C 1  and C 2 . Further, the pixel electrode  150  is connected to the drain region  110   d  through the second contact hole  195 . Accordingly, the pixel electrode  150  also functions as a drain electrode. Meanwhile, the pixel electrode  150  is formed of a transparent conductor such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). Pixel sub-electrodes  150 B,  150 C 1  and  150 C 2  of the pixel electrode  150  respectively formed in the reflection region B and the transmission regions C 1  and C 2  are electrically connected through connection portions  160  made of a transparent conductive material and simultaneously formed together with the pixel electrode  150 . Since the transmission regions C 1  and C 2  are arranged such that the reflection region B is interposed between them and the pixel sub-electrodes  150 B,  150 C 1  and  150 C 2  are formed in the respective regions, the pixel sub-electrodes  150 C 1  and  150 C 2  in the transmission regions C 1  and C 2  need not be spaced apart from each other with a bridge region in between. Accordingly, it is possible to prevent the aperture loss corresponding to the spaced distance. 
         [0035]    The reflection film  170  is formed on a surface of the pixel electrode  150  in the reflection region B, and preferably has an area larger than the pixel sub-electrode  150 B formed in the reflection region B. Further, it is preferred that the upper surface of the reflection film  170  be curved along the curved portion of the second protection film  145 . 
         [0036]    In addition, the cut-away portion  180 , which is a domain regulating means for controlling the orientation of liquid crystals, is formed in each of the pixel sub-electrodes  150 C 1  and  150 C 2  in the transmission regions C 1  and C 2 . Preferably, the cut-away portion  180  is formed in the shape of a circle at each central portion of the pixel sub-electrodes  150 C 1  and  150 C 2  in the transmission regions C 1  and C 2 . This is to uniformly control the orientation of liquid crystals in the pixel sub-electrodes  150 C 1  and  150 C 2 . As mentioned above, the pixel sub-electrodes  150 C 1  and  150 C 2  generally have the shape of a rectangle with rounded corners. In some embodiments, the pixel sub-electrodes  150 C 1  and  150 C 2  may include projections rather than the cut-away portions  180 . 
         [0037]    The color filter substrate  200  includes a black matrix  220 , a color filter  230 , an overcoat film  240  and a common electrode  250 , which are formed on a second insulation substrate  211 . 
         [0038]    The black matrix  220  is formed to prevent light from leaking to regions outside the pixel region and optically interfering with adjacent pixel regions. Thus, the black matrix  220  is formed along the boundaries of the pixel electrode  150 . No black matrix  220  is formed in the pixel region A of the TFT substrate  100 . In more detail, the black matrix  220  is formed in a region corresponding to the data lines  140  of the TFT substrate  100 , and in a region corresponding to a space between the pixel electrode  150  and neighboring pixel electrodes. 
         [0039]    The color filters  230  are formed such that red, green and blue filters are repeated with the black matrix  220  as a boundary between the repeating units. The color filter  230  functions to provide color to the light emitted from a light source that passes through the liquid crystal layer (not shown). The color filter  230  may be formed of a photosensitive organic material. 
         [0040]    The overcoat film  240  is formed on the color filters  230  and parts of the black matrix  220  that are not covered by the color filters  230 . The overcoat film  240  serves to protect and planarize the color filters  230 , and may be formed of an acryl-based epoxy material. 
         [0041]    The common electrode  250  is formed on the overcoat film  240 . The common electrode  250  is made of a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). The cut-away pattern (not shown) may be formed in the common electrode  250 . The cut-away pattern (not shown) of the common electrode  250  serves to divide the liquid crystal layer (not shown) into a plurality of domains together with the cut-away portion  180  of the pixel electrode  150 . 
         [0042]    Hereinafter, a method of manufacturing the TFT substrate of the LCD so configured according to the present invention will be described with reference to  FIGS. 4 to 8 . 
         [0043]      FIGS. 4A to 8A  are plan views illustrating the method of manufacturing the TFT substrate according to the present invention,  FIGS. 4B ,  5 B,  6 B,  7 B, and  8 B are sectional views taken along the line I-I′ in  FIGS. 4A ,  5 A,  6 A,  7 A, and  8 A, respectively, and  FIGS. 4C ,  5 C,  6 C,  7 C, and  8 C are sectional views taken along the line II-II′ in  FIGS. 4A ,  5 A,  6 A,  7 A, and  8 A, respectively. 
         [0044]    Referring to  FIGS. 4A to 4C , a semiconductor layer is formed on the first insulation substrate  111 , which is transparent. The semiconductor layer is formed of a low-temperature polysilicon thin film, which is made by forming an amorphous silicon thin film and crystallizing it at a low temperature. Here, SPC (Solid Phase Crystallization), ELC (Excimer Laser Crystallization), MIC (Metal Induced Crystallization) or the like is widely used for crystallizing an amorphous silicon thin film as a low-temperature polysilicon thin film. Thereafter, the semiconductor layer is patterned through a photolithography and etching process using a first mask. The semiconductor layer is patterned in the shape of a rectangle in a predetermined region and extends from the predetermined region as an extension portion having a predetermined width. That is, the semiconductor layer is formed to extend from the region patterned in the shape of a rectangle to where the data lines  140  will be formed, passing through where the gate lines  120  will be formed. Here, the portion of the semiconductor layer patterned in the shape of a rectangle is the first electrode pattern  115 , and the extension portion of the semiconductor layer is the active layer  110  in which the source, drain and channel regions will be formed. Further, impurity ions are implanted into predetermined regions of the active layer  110 , i.e., a region overlapping where the data lines  140  will be formed and a region connected to the first electrode pattern  115 . After the impurity ions are implanted, the implanted impurity ions are activated using an excimer laser or the like. Here, the regions of the active layer  110  into which the impurity ions are implanted become the source and drain regions  110   s  and  110   d , and the other region becomes the channel region  110   c . The active layer  110  and the first electrode pattern  115  are formed through such processes. In the meantime, impurity ions may be implanted into the first electrode pattern  115 . 
         [0045]    Referring to  FIGS. 5A to 5C , the gate insulation film  117  is formed on top of the first insulation substrate  111  on which the active layer  110  having the source, drain and channel regions  110   s ,  110   d  and  110   c  formed and the first electrode pattern  115  are formed. The gate insulation film  117  is formed, for example, of silicon based insulation, such as silicon oxide or nitride. Further, a first conductive layer is formed on the first insulation substrate  111 . Here, it is preferred that the first conductive layer be formed of any one metal of Al, Nd, Ag, Cr, Ti, Ta and Mo, or an alloy thereof. Further, the first conductive layer may be formed in not only a single-layered structure but also a multiple-layered structure having a plurality of metal layers. That is, the first conductive layer may be formed as a double-layered structure including a metal layer of Cr, Ti, Ta, Mo or the like having superior physical and chemical characteristics, and another Al or Ag based metal layer having low specific resistance. Further, the first conductive layer is patterned through a photolithography and etching process using a second mask, thereby forming the gate lines  120  and the second electrode pattern  130 . Here, the gate lines  120  are formed to extend in one direction. Further, the second electrode pattern  130  is formed spaced apart from the gate line  120  at a predetermined interval, and to overlap the first electrode pattern  115  while exposing the drain region  110   d . Meanwhile, the second electrode pattern  130  and the first electrode pattern  115  constitute a storage capacitor with the gate insulation film  117  interposed between the first and second electrode pattern  115  and  130 . 
         [0046]    Referring to  FIGS. 6A to 6C , the first protection film  135  is formed on the first insulation substrate  111  having the gate line  120  and the second electrode pattern  130  formed thereon. Here, the first protection film  135  may be formed of an inorganic material such as silicon nitride or oxide, and formed of an organic insulation material with a low dielectric constant. Further, the first protection film  135  may be formed in a double-layered structure of an inorganic insulation layer and an organic insulation layer. The first protection film  135  and the gate insulation film  117  formed thereunder are etched through a photolithography and etching process using a third mask to form the first contact hole  190  extending to the source region  110   s  of the active layer  110 . Further, a second conductive layer is formed on top of the first insulation substrate  111 . The second conductive layer is formed of the material used to form the first conductive layer. The second conductive layer is patterned through a photolithography and etching process using a fourth mask so as to form the data lines  140 . The data lines  140  extend in a direction that is substantially perpendicular to the gate lines  120 . Further, the second conductive layer is connected to the source region  110   s  through the first contact hole  190 . Thus, the data line  140  also functions as a source electrode. 
         [0047]    Referring to  FIGS. 7A to 7C , the second protection film  145  is formed on the first insulation substrate  111  having the data lines  140  formed thereon. Like the first protection film  135 , the second protection film  145  may be formed of an inorganic material such as silicon or nitride oxide, or an organic insulation organic insulation with a low dielectric constant. The second protection film  145  may be formed in a double-layered structure of inorganic and organic insulation films. Further, it is preferred that the second protection film  145  in the reflection region B be curved, and the second protection film  145  in the transmission regions C 1  and C 2  may also be curved. In addition, the second protection film  145 , the first protection film  135  and the gate insulation film  117  are etched through a photolithography and etching process using a fifth mask to form the second contact hole  195  that extends to the drain region  110   d  of the active region  110 . 
         [0048]    Referring to  FIGS. 8A to 8C , a third conductive layer is formed on the first insulation substrate  111  having the second contact hole  195  formed thereon. Further, the third conductive layer is patterned through a photolithography and etching process using a sixth mask to form the pixel electrode  150 . The pixel electrode  150  is formed in the pixel region A defined between the data lines  140 , and to be spaced apart from adjacent pixel electrodes at a predetermined interval. The pixel region A includes the reflection region B at the central portion thereof through which the gate line  120  and the second electrode pattern  130  pass, and the transmission regions C 1  and C 2  at two sides of the reflection region B. Each of the pixel sub-electrodes  150 B,  150 C 1  and  150 C 2  respectively formed in the reflection region B and the transmission regions C 1  and C 2  are formed in the shape of a rectangle with rounded corners. The pixel sub-electrodes  150 B,  150 C 1  and  150 C 2  formed in the reflection region B and the transmission regions C 1  and C 2  are connected electrically through the connection portions  160 . The connection portions  160  are formed when the pixel electrode  150  is formed by patterning a fourth conductive layer. Further, the pixel electrode  150  is connected to the drain region  110   d  through the second contact hole  195 . Thus, the pixel electrode  150  functions as the drain electrode. Meanwhile, the fourth conductive layer for forming the pixel electrode  150  and the connection portion  160  is formed of a transparent conductor such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). Preferably, the cut-away portion  180  is formed in the shape of a circle at each central portion of the pixel sub-electrodes  150 C 1  and  150 C 2  in the transmission regions C 1  and C 2  when patterning the pixel electrode  150 . Further, the reflection film  170  is formed on top of the first insulation substrate  111  through a photolithography and etching process using a seventh mask such that the reflection film  170  remains only in the reflection region B. Preferably, the reflection film  170  is formed to be larger than the pixel sub-electrode  150 B formed in the reflection region B. Further, it is preferred that the upper surface of the reflection film  170  be curved along the curved portion of the second protection film  145 . The reflection film  170  may be in a single- or multiple-layered structure of a metal including at least any one of Ag, Al, Au, Nd and Cu with superior light reflectivity. 
         [0049]    The color filter substrate  200  is manufactured separately from the TFT transistor substrate  100 . In order to manufacture the color filter substrate  200 , the black matrix is formed in the predetermined region of the second substrate  211 , i.e., the region that would not overlap the pixel electrode  150  of the TFT substrate  100  when the two substrates are combined. The color filters  230  are formed to overlap the pixel electrode  150  when the two substrates are combined. Further, the overcoat film  240  is formed to even out the step difference between the black matrix  220  and the color filters  230 . Thereafter, the common electrode  250  is formed on the color filter substrate  200 . 
         [0050]    The TFT and color filter substrates  100  and  200  manufactured as described above are bonded by positioning the substrates such that the pixel electrode  150  and the common electrode  250  are as close to each other as possible, and pressing them together. A sealing film may be used for bonding the substrates. Further, spacers may be provided to maintain a desired cell gap between the two substrates. Thereafter, the LCD panel  300  is manufactured by injecting the liquid crystals between the two substrates and sealing the substrates. 
         [0051]    In the LCD panel manufactured as described above, if an electric signal required to form an image is applied to the pixel electrode  150  through the TFT of the TFT substrate  100  and a common voltage is applied to the common electrode  250  of the color filter substrate  200 , an electric field is formed between the pixel and common electrodes  150  and  250 . The alignment of the liquid crystals is changed according to the electric field, and light transmittance changes in accordance with the alignment to display a desired image. 
         [0052]    As described above, according to the present invention, a pixel region includes a reflection region located between two transmission regions, and the reflection region is formed in a region in which gate lines and a storage capacitor are formed. 
         [0053]    Accordingly, pixel sub-electrodes formed in the two transmission regions do not have to be spaced apart from each other as in the prior art, which uses a bridge region to connect the two transmission regions. By avoiding the use of a bridge region, the invention avoids the undesirable decrease in the aperture ratio. 
         [0054]    Further, the reflection region is formed in a region in which the gate lines and the storage capacitor are formed, so that the area of the reflection region can be increased and the area of the pixel region can also be increased. 
         [0055]    The scope of the present invention is not limited to the embodiment described and illustrated above but is defined by the appended claims. It will be apparent that those skilled in the art can make various modifications and changes thereto within the scope of the invention defined by the claims. Therefore, the true scope of the present invention should be defined by the technical spirit of the appended claims.