Abstract:
A thin film transistor array panel and a method of its manufacture are presented. The thin film transistor array panel according to an embodiment includes a substrate, a gate line extending in a first direction on the substrate, a data line extending in a second direction on the substrate and intersecting and insulated from the gate line, a thin film transistor including a control terminal connected to the gate line, an input terminal connected to the data line and an output terminal, a color filter formed on the thin film transistor, a light blocking member formed on the thin film transistor, defining the space for storing the color filter, and including a first protection portion surrounding at least the region of the output terminal of the thin film transistor, and a pixel electrode formed on the light blocking member and the color filter and contacting the region of the output terminal surrounded by the first protection portion of the light blocking member.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2007-0127011 filed in the Korean Intellectual Property Office on Dec. 7, 2007, the entire content of which is incorporated herein by reference. 
     BACKGROUND 
     (a) Technical Field 
     The present invention relates a thin film transistor array panel and a manufacturing method thereof. 
     (b) Description of the Related Art 
     Liquid crystal displays (LCDs) are one of the most widely used flat panel displays. An LCD includes a pair of panels provided with field-generating electrodes, such as pixel electrodes and a common electrode, and a liquid crystal (LC) layer interposed between the two panels. The LCD displays images by applying voltages to the field-generating electrodes to generate an electric field in the LC layer that determines the orientations of LC molecules therein to adjust polarization of incident light. 
     This liquid crystal display also includes a color filter for displaying colors by using light transmitted through the liquid crystal layer, and the color filter is generally disposed on a display panel having a common electrode. Since the color filter commonly includes red, green, and blue colors, the color filters are aligned to face the corresponding pixels when the two display panels are combined. However, because the area of the light blocking member defining the openings corresponding to the pixels is sufficiently wide considering a misalignment margin, the size of the openings is decreased such that the aperture ratio of the pixels may be reduced. 
     To solve the problem, techniques in which the color filters are formed on the display panel having thin film transistors or the color filters are formed through an Inkjet method have been provided. Forming the color filters using an inkjet deposition method is advantageous because photolithographic light exposure is not used, and it simplifies the manufacturing process. 
     However, because the color filters cover the drain electrodes of the thin film transistors in this conventional art, contact holes for the connection between the pixel electrodes and the drain electrodes are formed through an overcoat layer covering color filters, the color filters, and a passivation layer. Accordingly, there are manufacturing process complications, the etching uniformity of the color filters is deteriorated, and loose particles that are generated when etching the color filters contaminate the processing chamber. 
     The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. 
     SUMMARY 
     Embodiments of the present invention are disclosed to simplify a method of manufacturing a liquid crystal display, including to easily form color filters. 
     In an exemplary embodiment of the present invention, a light blocking member encloses contact holes. 
     In one aspect, the invention is a thin film transistor array panel that includes a substrate; a gate line extending in a first direction on the substrate; a data line, insulated from the gate line, extending in a second intersecting direction on the substrate; a thin film transistor including a control terminal connected to the gate line; an input terminal connected to the data line and an output terminal; a color filter formed on the thin film transistor; a light blocking member formed on the thin film transistor, defining the space for storing the color filter, and including a first protection portion surrounding at least the region of the output terminal of the thin film transistor; and a pixel electrode formed on the light blocking member and the color filter, and contacting the region of the output terminal surrounded by the first protection portion of the light blocking member. 
     The height of the light blocking member may be in the range of 1.5 μm-4 μm, the light blocking member may include a second protection portion extending according to the data line, and the color filter has different colors in two regions divided by a signal line portion. 
     The thin film transistor array panel may include a storage electrode line extending in the first direction and including a storage electrode, wherein the light blocking member may include a third protection portion surrounding at least the portion of the storage electrode along with the second protection portion to prevent the color filter from being formed on the storage electrode. 
     The light blocking member may include a fourth protection portion covering the thin film transistor. 
     At least a portion of the output terminal of the thin film transistor may overlap the storage electrode, and the first protection portion of the light blocking member may enclose the portion of the output terminal overlapping the storage electrode. 
     The thin film transistor may include a first thin film transistor and a second thin film transistor; the pixel electrode may include a first sub-pixel electrode connected to the output terminal of the first thin film transistor and a second sub-pixel electrode connected to the output terminal of the second thin film transistor; and the first protection portion of the light blocking member may include first and second portions disposed on both sides with respect to the storage electrode, and a third portion connecting the first portion and the second portion to each other and overlapping a gap between the first sub-pixel electrode and the second sub-pixel electrode. 
     The thin film transistor array panel may further include a passivation layer formed over the thin film transistor and under the light blocking member and the color filter, and an overcoat layer formed over the light blocking member and the color filter and under the pixel electrode, wherein the pixel electrode may be connected to the output terminal of the thin film transistor through a contact hole formed in the passivation layer and the overcoat layer. 
     The data line may include a first data line and a second data line, the thin film transistor may include a first thin film transistor having an input terminal connected to the first data line and a second thin film transistor having an input terminal connected to the second data line, and the pixel electrode may include a first sub-pixel electrode connected to an output terminal of the first thin film transistor and a second sub-pixel electrode connected to an output terminal of the second thin film transistor. 
     The thin film transistor array panel may further include a storage electrode line extending in the first direction and including a storage electrode, wherein the first protection portion of the light blocking member may include a first portion surrounding the output terminal of the first thin film transistor and a second portion surrounding the output terminal of the second thin film transistor, and the first and second portions of the light blocking member may overlap the storage electrode. 
     The thin film transistor array panel may further include a storage electrode line extending in the first direction and including a storage electrode, wherein the first protection portion of the light blocking member may include a first portion surrounding the output terminal of the first thin film transistor and a second portion surrounding the output terminal of the second thin film transistor, and the first and second portions of the light blocking member may overlap the storage electrode. 
     In another aspect, the invention is a method for manufacturing a thin film transistor array panel includes forming a gate line extending in a first direction; forming a gate insulating layer on the gate line; forming a semiconductor layer on the gate insulating layer; forming a data line and a drain electrode extending in a second direction intersecting the first direction; forming a passivation layer on the data line and the drain electrode; forming a light blocking member including a first portion defining a storing space and extending in the second direction on the passivation layer and a second portion surrounding the circumference of the end portion of the drain electrode; forming a color filter in the storing space through an inkjet process; forming a contact hole exposing the end portion of the drain electrode enclosed by the second portion; and forming a pixel electrode connected to the drain electrode through the contact hole. 
     The method may further include forming an overcoat layer covering the color filter between the forming of the color filter and the forming of the contact hole, wherein the overcoat layer and the passivation layer may be patterned together by photolithography in the forming of the contact hole. 
     The light blocking member may include forming a photosensitive film by coating a photosensitive material including black color pigments, exposing the photosensitive film, and developing the photosensitive film. 
     According to an embodiment of the present invention, the light blocking member is formed according to the data line to define a storing space with a stripe shape such that the color filter may be easily formed by using an Inkjet process. 
     Also, the contact hole may be surrounded by the light blocking member in the present invention such that it may prevent the color filter from covering the contact hole even though the color filter is formed through the Inkjet process. 
     Also, the storing space where the color filter is formed may be disposed with a striped arrangement in the present invention such that ink dripping for the color filter may be sequentially executed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a layout view of a thin film transistor array panel according to a first exemplary embodiment of the present invention; 
         FIG. 2  is a cross-sectional view taken along the line II-II of  FIG. 1 ;  FIG. 3  is a cross-sectional view taken along the line III-III of  FIG. 1 ;  FIG. 4  is a cross-sectional view taken along the line IV-IV of  FIG. 2 ; 
         FIG. 5 ,  FIG. 8 , and  FIG. 11  are layout views sequentially illustrating the manufacturing process of the thin film transistor array panel shown in  FIG. 1  according to the exemplary embodiment of the present invention; 
         FIG. 6  and  FIG. 7  are cross-sectional views respectively taken along the lines VI-VI and VII-VII of  FIG. 5 ; 
         FIG. 9  and  FIG. 10  are cross-sectional views respectively taken along the lines IX-IX and X-X of  FIG. 8 ; 
         FIG. 12  and  FIG. 13  are cross-sectional views respectively taken along the lines XII-XII and XIII-XIII of  FIG. 11 ; 
         FIG. 14  and  FIG. 15  are cross-sectional views respectively taken along the lines XII-XII and XIII-XIII of  FIG. 11  and showing the formation of color filters; 
         FIG. 16  and  FIG. 17  are cross-sectional views showing the formation of an overcoat layer on the color filters shown in  FIG. 14  and  FIG. 15 ; 
         FIG. 18  is a layout view only showing an organic light blocking member in the thin film transistor array panel shown in  FIG. 1 ; 
         FIG. 19  is a layout view of a thin film transistor array panel according to a second exemplary embodiment of the present invention; 
         FIG. 20  is a cross-sectional view taken along the line XX-XX of  FIG. 19 ; 
         FIG. 21  is a cross-sectional view taken along the line XXI-XXI of  FIG. 19 ; 
         FIG. 22  is a layout view only showing an organic light blocking member in the thin film transistor array panel shown in  FIG. 19 ; 
         FIG. 23  is a layout view of a thin film transistor array panel according to a third exemplary embodiment of the present invention; and 
         FIG. 24  is a layout view only showing an organic light blocking member in the thin film transistor array panel shown in  FIG. 23 . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Embodiments of the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary 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. 
     Exemplary Embodiment 1 
     Now, a thin film transistor array panel according to an exemplary embodiment of the present invention will be described in detail.  FIG. 1  is a layout view of a thin film transistor array panel according to a first exemplary embodiment of the present invention, and  FIG. 2  to  FIG. 4  are cross-sectional views taken along the lines II-II, III-III, and IV-IV of  FIG. 1 , respectively. 
     In a thin film transistor array panel according to an exemplary embodiment of the present invention, a plurality of gate lines  121  and a plurality of storage electrode lines  131  are formed on an insulation substrate  110  that is preferably made of transparent glass. 
     The gate lines  121  transmit gate signals and extend substantially in a transverse direction. Each gate line  121  includes a plurality of protrusions including gate electrodes  124   a  and  124   b , and an end portion  129  having a large area for connection with another layer or an external driving circuit. The storage electrode lines  131  are disposed between the two adjacent gate lines  121  and extend substantially parallel to the gate lines  121  in the transverse direction. A predetermined voltage, such as a common voltage Vcom applied to a common electrode, is applied to the storage electrode line  131 . The storage electrode line  131  includes a plurality of protrusions forming a plurality of storage electrodes  137 , and a plurality of branches  133   a  and  133   b  for preventing light leakage and increasing the area of the storage electrodes. 
     The gate lines  121  and the storage electrode lines  131  may have a multi-layered structure including two conductive layers (not shown) having different physical properties. One of the two conductive layers is preferably made of a low resistivity metal, such as an Al-containing metal, a Ag-containing metal, or a Cu-containing metal, for reducing signal delay or voltage drop in the gate lines  121  and the storage electrode lines  131 . The other conductive layer is preferably made of a material such as a Mo-containing metal, Cr, Ti, and Ta, which has good contact characteristics with other materials such as indium tin oxide (ITO) and indium zinc oxide (IZO). As examples of these combinations, a chromium lower layer and an aluminum (alloy) upper layer, and an aluminum (alloy) lower layer and a molybdenum (alloy) upper layer may be formed. However, the gate lines  121  and the storage electrode lines  131  may be made of various other metals or electrical conductors. 
     Side surfaces of the gate lines  121  and the storage electrode lines  131  are inclined to a surface of the substrate  110 , and an inclination angle thereof is preferably about 30° to 80°. 
     A gate insulating layer  140 , which is made of silicon nitride (SiNx), silicon oxide (SiOx), or so on, is formed on the gate lines  121  and the storage electrode lines  131 . 
     A plurality of semiconductor stripes  151   l  and  151   r  that are made of hydrogenated amorphous silicon (a-Si), polysilicon, or the like, are formed on the gate insulating layer  140 . The semiconductor stripes  151   l  and  151   r  that are respectively disposed on right and left sides form a pair. The semiconductor stripes  151   l  and  151   r  substantially extend in a vertical direction, and include a plurality of protrusions  154   a  and  154   b  respectively extending toward the gate electrodes  124   a  and  124   b.    
     A plurality of ohmic contact stripes  161   l  and  161   r  and islands  165   a  and  165   b  (ohmic contacts) are formed on the semiconductor stripes  151   l  and  151   r . The ohmic contact stripes  161   l  and  161   r  and islands  165   a  and  165   b  may be made of a material such as n+ hydrogenated amorphous silicon in which an n-type impurity such as phosphorus is doped with high concentration, or of silicide. The ohmic contact stripes  161   l  and  161   r  respectively include a plurality of protrusions  163   a  and  163   b , and the protrusions  163   a  and  163   b  and the ohmic contact islands  165   a  and  165   b  are formed in pairs and are disposed on the protrusions  154   a  and  154   b  of the semiconductor stripes  151   l  and  151   r , respectively. 
     The semiconductors  151   l  and  151   r  and the ohmic contacts  161   l ,  161   r ,  165   a , and  165   b  are also inclined with respect to a surface of the substrate  110 , and an inclination angle thereof is about 30° to 80°. 
     A plurality of left and right data lines  171   l  and  171   r  and a plurality of first and second drain electrodes  175   a  and  175   b  are formed on the ohmic contacts  161   l ,  161   r ,  165   a , and  165   b . Here, the ohmic contact stripes  161   l  and  161   r , and the semiconductor stripes  151   l  and  151   r , are disposed under the left data lines  171   l  and the right data lines  171   r , respectively. 
     The data lines  171   l  and  171   r  transmit data voltages, and extend substantially in a vertical direction while intersecting the gate lines  121  and the storage electrode lines  131 . Each of the data lines  171   l  and  171   r  includes a plurality of source electrodes  173   a  and  173   b  curved toward the gate electrodes  124   a  and  124   b  and having “U” shape, and end portions  179   l  and  179   r  for connecting to other layers or an external driving circuit. 
     The drain electrodes  175   a  and  175   b  are respectively separated from the data lines  171   l  and  171   r , and face the source electrode  173   a  and  173   b  with respect to the gate electrodes  124   a  and  124   b . Each of the drain electrodes  175   a  and  175   b  includes one end portion connected to respective sub-pixel electrodes  191   a  and  191   b  and having a wide area, and the other end portion having a bar shape. The portions of the drain electrodes  175   a  and  175   b  with the bar shape are enclosed by the source electrodes  173   a  and  173   b  with the “U” shape, respectively. 
     The gate electrodes  124   a  and  124   b , the source electrodes  173   a  and  173   b , and the drain electrodes  175   a  and  175   b  respectively form thin film transistors Qa and Qb along with the semiconductors  154   a  and  154   b , and the channels of the thin film transistors are formed on the semiconductors  154   a  and  154   b  between the source electrodes  173   a  and  173   b , and the drain electrodes  175   a  and  175   b.    
     The data lines  171   l  and  171   r , and the drain electrodes  175   a  and  175   b , may have a multi-layered structure including a refractory metal layer (not shown) and a low resistance conductive layer (not shown). A multi-layered structure includes, for example, a dual-layer of a chromium or molybdenum (alloy) lower layer and an aluminum (alloy) upper layer, and a triple-layer of a molybdenum (alloy) lower layer, an aluminum (alloy) middle layer, and a molybdenum (alloy) upper layer. However, the data lines  171   l  and  171   r , and the drain electrodes  175   a  and  175   b , may be made of various other metals or conductors. 
     It is preferable that side surfaces of the data lines  171   l  and  171   r  and the drain electrodes  175   a  and  175   b  are also inclined relative to the surface of the substrate  110 , and an inclination angle thereof is about 30° to 80°, like the gate lines  121  and the storage electrode lines  131 . 
     A passivation layer  180  is formed on the data lines  171   l  and  171   r  and the drain electrodes  175   a  and  175   b . The passivation layer  180  is preferably made of silicon nitride or silicon oxide. 
     A light blocking member  220  is formed on the passivation layer  180 . Referring to  FIG. 18 , the light blocking member  220  includes first portions  221  extending on the data lines  171   l  and  171   r  in the vertical direction, second portions  223   a  and  223   b  respectively disposed above and below the storage electrode lines  131 , third portions  225   a  and  225   b  respectively disposed on the circumference with the drain electrodes  175   a  and  175   b , and fourth portions  227   a  and  227   b  respectively covering the channels of the thin film transistors Qa and Qb. 
     The first portions  221  cover the data lines  171   l  and  171   r , and extend according to the data lines  171   l  and  171   r  in the vertical direction for forming a dam. Specifically, the first portions  221  are disposed with the stripe shape to define the space for storing the color filters  230  in the vertical direction, resultantly forming the storing space in the vertical direction. The second portions  223   a  and  223   b  are disposed above and below the storage electrode  137  and are formed parallel to the storage electrodes  137  in the horizontal direction such that they are connected between the first portions  221 . The third portions  225   a  and  225   b  are disposed on the end portions of the drain electrodes  175   a  and  175   b , and have a fence shape enclosing the end portions of the drain electrodes  175   a  and  175   b , when shown on a plane surface. The shapes of the third portions  225   a  and  225   b  may be various, such as a quadrangle as shown in  FIG. 1 , an octagonal shape, or a circular shape. 
     In this way, because the first portion  221  extends in the vertical direction and forms the dam, the liquid material (hereafter “ink”) for forming color filters may be dripped in the storing space through an Inkjet to form the color filters  230 . Here, the second portions  223   a  and  223   b  are formed adjacent to the storage electrodes  137  such that they may prevent the color filter  230  from being formed over the storage electrode  137 . Also, because the third portions  225   a  and  225   b  are formed on the portion where contact holes  185   a  and  185   b  for connecting the drain electrodes  175   a  and  175   b  to pixel electrodes are disposed, they prevent the liquid material from flowing in the portion where the contact holes  185   a  and  185   b  will be formed in the Inkjet process such that they prevent the color filter  230  from covering the portion corresponding to the contact holes  185   a  and  185   b.    
     The color filters  230  may each be colored red, green, or blue. If a red color filter is formed in a first storing space, a green color filter or a blue color filter may be formed in a second storing space neighboring the first storing space in the horizontal direction with the first portion  221  interposed therebetween. Accordingly, the color filters  230  have a striped arrangement of the sequence of green, red, and blue. Here, the height of the color filters  230  may be in the range of about 1-3 μm. 
     The light blocking member  220  further includes fourth portions  227   a  and  227   b  disposed on the thin film transistors Qa and Qb. The fourth portions  227   a  and  227   b  block light that is incident on the channels of the thin film transistors Qa and Qb. In the drawings, the fourth portions  227   a  and  227   b  are separated from the first portions  221  and are formed as islands but they may be connected to the first portions  221  in other embodiments. 
     Here, the height of the light blocking member  220  is in the range of 1.5-4 μm to prevent the ink for the color filters from overflowing, and the width of the light blocking member  220  may be variously changed according to necessity. The color filters  230  are finally formed with a height of about 1-3 μm, but because the ink for the color filter includes a required solvent for the liquid as well as the solid content of the color filter, the ink is formed with a height of about 10 μm in the Inkjet process. When the height of the light blocking member  220  is less than 1.5 μm, the ink overflows the light blocking member  220  and may inflow to inside the portion for the formation of the contact hole. Also, if the height of the light blocking member  220  is less than 1.5 μm, the function for preventing the light transmission is deteriorated, thereby losing the function as a light blocking member. Here, the height of the ink becomes about 10 μm such that it is more than several times the height of the light blocking member  220 , but the ink does not overflow the light blocking member  220  due to surface tension of the ink. When the height of the light blocking member  220  is more than 4 μm, the differences between the heights of the color filters  230  and the light blocking member  220  are increased such that the high planarity of thin films that will be formed thereafter is deteriorated, and as a result, the cell gap uniformity of the liquid crystal may be compromised. 
     An overcoat layer  250  is formed on the light blocking member  220  and the color filters  230 . The overcoat layer  250  is disposed on the passivation layer  180  covering the storage electrode line  131  between the second portions  223   a  and  223   b , and on the passivation layer  180  covering the end portions of the drain electrodes  175   a  and  175   b  protected by the third portions  225   a  and  225   b . The overcoat layer  250  may be preferably made of an inorganic or organic insulating material. 
     The overcoat layer  250  and the passivation layer  180  have a plurality of contact holes  182   l ,  182   r ,  185   a , and  185   b  exposing the end portions  179   l  and  179   r  of the data lines  171   l  and  171   r , and the end portions of the drain electrodes  175   a  and  175   b . Also, the overcoat layer  250 , the passivation layer  180 , and the gate insulating layer  140  have a plurality of contact holes  181  exposing the end portions  129  of the gate lines  121 . The contact holes  185   a  and  185   b  are disposed inside the third portions  225   a  and  225   b , and are formed by simultaneously etching the overcoat layer  250  and the passivation layer  180 . Here, the inflow of the ink is prevented by the third portion  225   a  and  225   b  in the portion where the contact holes  185   a  and  185   b  are formed in the Inkjet process. Therefore, because the color filters  230  do not exist at the contact holes  185   a  and  185   b , the drain electrodes  175   a  and  175   b  may be exposed by simultaneously etching the overcoat layer  250  and the passivation layer  180 . For the same reason, although the color filters  230  are formed through the Inkjet process, the contact holes  185   a  and  185   b  may be easily formed, and contamination of the chamber and non-uniformity of the etching generated when the color filters  230  are etched may be eliminated. 
     A plurality of first and second sub-pixel electrodes  191   a  and  191   b  and a plurality of contact assistants  81 ,  82   l , and  82   r  are formed on the overcoat layer  250 . They may be made of a transparent conductive material such as ITO or IZO, or a reflective metal such as aluminum, silver, or chromium. 
     The first sub-pixel electrode  191   a  and the second sub-pixel electrode  191   b  are physically and electrically connected to the drain electrodes  175   a  and  175   b  through the contact holes  185   a  and  185   b , respectively, and the data voltage is applied from the drain electrodes  175   a  and  175   b  to the first and second pixel electrodes  191   a  and  191   b.    
     Two sub-pixel electrodes  191   a  and  191   b  applied with the data voltages generate an electric field along with the common electrode to determine the orientation of liquid crystal molecules of the liquid crystal layer interposed between the electrodes  191  and  270 . Here, because the first sub-pixel electrodes  191   a  receive the data voltages through the left data lines  171   l  and the second sub-pixel electrodes  191   b  receive the data voltages through the right data lines  171   r , different voltage may be applied thereto. In this way, if the different voltages are applied, the arrangement of the liquid crystal of the corresponding regions becomes different. Accordingly, when the voltages applied to the first and second sub-pixel electrodes  191   a  and  191   b  are appropriately adjusted, it is possible to make an image viewed from the side be as similar as possible to an image viewed from the front. That is, it is possible to improve the side visibility of the liquid crystal display. Here, it is preferable that the absolute value of the voltage applied to the first sub-pixel electrode  191   a  having a wider area among the first sub-pixel electrodes  191   a  and the second sub-pixel electrodes  191   b  is higher than the absolute value of the voltage applied to the second sub-pixel electrodes  191   b  to improve the side visibility. 
     The first sub-pixel electrodes  191   a  have a plurality of cutouts, and the cutouts and a gap  94  between the first sub-pixel electrode  191   a  and the second sub-pixel electrode  191   b  generate horizontal components of the electric field along with cutouts of a common electrode (not shown) formed on a display panel (not shown) facing the thin film transistor array panel or protrusions (not shown) formed on the common electrode to control the arrangement operation of the liquid crystal. 
     The sub-pixel electrodes  191   a  and  191   b  and the common electrode form a capacitor (hereinafter referred to as “liquid crystal capacitor”) to maintain the applied voltage even after the thin film transistor is turned off. To enhance the voltage storage capacity, a storage capacitor coupled to the liquid crystal capacitor in parallel is formed by overlapping the first and second sub-pixel electrodes  191   a  and  191   b , and the storage electrode lines  131 . Here, because the color filters  230  do not exist between the storage electrodes  137  and the first and second sub-pixel electrodes  191   a  and  191   b , the capacitance of the storage capacitor is increased. If it is preferable that the capacitance of the storage capacitor is small, the second portions  223   a  and  223   b  of the light blocking member  220  for preventing the color filters  230  from being formed on the storage electrode  137  are not necessary. In this case, the color filters  230  are formed on the storage electrodes  137  such that the color filters  230  are disposed between the first and second sub-pixel electrodes  191   a  and  191   b , and the storage electrode  137 , thereby reducing the capacitance of the storage capacitor. A kick-back voltage may be increased due to the reduction of the storage capacitance, but this may be solved by decreasing the size of the thin film transistor to reduce the parasitic capacitance generated between the gate electrode and the drain electrode thereof, or by using a liquid crystal material having a large dielectric constant to increase the liquid crystal capacitance. 
     A pair of first and second subpixel electrodes  191   a  and  191   b  forming one pixel electrode are engaged with each other with the gap  94  therebetween. The shape of the pixel electrodes  191  may be variously changed. 
     Next, the manufacturing method of the thin film transistor array panel will be described in detail. 
       FIG. 5  to  FIG. 7  are views showing formation of a gate line and a storage electrode line,  FIG. 8  to  FIG. 10  are views showing formation of a data line and a drain electrode,  FIG. 11  to  FIG. 13  are views showing formation of a light blocking member,  FIG. 14  and  FIG. 15  are views showing formation of a color filter, and  FIG. 16  and  FIG. 17  are views showing formation of an overcoat layer. 
     First, as shown in  FIG. 5  to  FIG. 7 , a metal layer such as aluminum-neodymium (Al—Nd) or molybdenum (Mo) is deposited on an insulating substrate  110  and patterned through photolithography to form a plurality of gate lines  121  including a plurality of gate electrodes  124   a  and  124   b  and a plurality of end portions  129 , and a plurality of storage electrode lines  131  including a plurality of branches  133   a  and  133   b  and a plurality of storage electrodes  137 . 
     Next, as shown in  FIG. 8  to  FIG. 10 , after forming a gate insulating layer  140  on the gate lines  121  and the storage electrode lines  131 , a semiconductor layer, an ohmic contact layer, a data metal layer, and a photosensitive film are sequentially deposited, and the photosensitive film is exposed and developed through a photo-process using a half-tone mask to form a photosensitive film pattern having different thicknesses depending on position. Here, in the photosensitive film pattern, the thickness of a portion corresponding to the portion where the data lines  171   l  and  171   r  and the drain electrodes  175   a  and  175   b  will be formed is thick, and the thickness of a portion corresponding to the portion between the source electrodes  173   a  and  173   b  and the drain electrodes  175   a  and  175   b  is thin. Next, the data metal layer, the ohmic contact layer, and the semiconductor layer are etched by using the photosensitive film pattern as an etch mask to form a preliminary data line, a preliminary ohmic contact, and the plurality of semiconductor stripes  151   l  and  151   r , and the photosensitive film pattern is ashed to remove a thin portion among the photosensitive film pattern corresponding to the portion between the source electrodes  173   a  and  173   b , and the drain electrodes  175   a  and  175   b . Next, the preliminary data line and the preliminary ohmic contact are etched by using the ashed photosensitive film pattern as an etch mask to form a plurality of data lines  171   l  and  171   r  and a plurality of drain electrodes  175   a  and  175   b , and a plurality of ohmic contacts  161   l ,  161   r ,  165   a , and  165   b  thereunder. 
     Next, as shown in  FIG. 11  to  FIG. 13 , a photoresist in which black color pigments are dispersed is coated, exposed, and developed to form a light blocking member  220  including a plurality of first portions  221 , a plurality of second portions  223   a  and  223   b , a plurality of third portions  225   a  and  225   b , and a plurality of fourth portions  227   a  and  227   b  to define a storing space for providing an ink. Here, the light blocking member  220  has a height of about 1.5-4 μm, and may be made of an organic material having excellent heat resistance. The height of the ink is about 10 μm in the inkjet process for a color filter because when the height of the light blocking member  220  is less than 1.5 μm, the ink overflows onto the light blocking member  220  and may flow into the portion where the contact holes will be formed. Here, the height of the ink becomes about 10 μm such that the height thereof is several times more than the height of the light blocking member  220 , but the light blocking member  220  is not overflowed with the ink due to the surface tension of the ink. When the height of the light blocking member  220  is more than 4 μm, the difference between the heights of the light blocking member  220  and the color filters  230  is increased such that the surface evenness of thin films that will be formed thereafter is deteriorated, and the uniformity of the liquid crystal cell gap is compromised. 
     When the light blocking member  220  is made of a non-photosensitive organic material, it is patterned through photolithography. 
     Next, as shown in  FIG. 11 ,  FIG. 14 , and  FIG. 15 , a plurality of color filters  230  are formed in the storing space through an Inkjet process. The ink is supplied to the storing space according to dripping points in an arrow direction that a nozzle (not shown) is moved, and flows in all directions while being filled in the storing space. In this process, because the second portions  223   a  and  223   b  are disposed with the storage electrode  137  interposed therebetween, and the third portions  225   a  and  225   b  enclose the end portions of the drain electrodes  175   a  and  175   b  corresponding to the contact holes, the ink does not flow inside the upper portion of the storage electrode  137 , or the inner portion of the third portions  225   a  and  225   b , that is, the portion where the contact holes are positioned. On the other hand, because the ink stored in the storing space through the Inkjet process is liquid, the ink may flow over the second portions  223   a  and  223   b  or the third portion  225   a  and  225   b . Accordingly, the physical properties such as viscosity and surface tension may be controlled, or the heights and the thicknesses of the second portions  223   a  and  223   b  or the third portions  225   a  and  225   b  may be controlled to prevent the ink from overflowing. 
     Next, as shown in  FIG. 16  and  FIG. 17 , an overcoat layer  250  is formed on the color filters  230 , and the overcoat layer  250  and the passivation layer  180  are simultaneously patterned through photolithography to form a plurality of contact holes  185   a  and  185   b  enclosed by the third portions  225   a  and  225   b . In this way, because the inner portion of the third portions  225   a  and  225   b  in the Inkjet process is protected by the third portion  225   a  and  225   b  such that the color filters  230  do not exist, the contact holes  185   a  and  185   b  may be easily formed through one photolithography step. 
     Next, a plurality of first and second sub-pixel electrodes  191   a  and  191   b , and a plurality of contact assistants  81 ,  82   l , and  82   r  are formed on the overcoat layer  250 . 
     Exemplary Embodiment 2 
     Next, a thin film transistor array panel according to the second exemplary embodiment of the present invention will be described with the accompanying drawings. A thin film transistor array panel according to the second exemplary embodiment includes differences such as the shapes of a light blocking member, a storage electrode, source and drain electrodes, a pixel electrode, and the connection of the pixel electrode and a thin film transistor, compared with the first exemplary embodiment. Hereafter, the second exemplary embodiment is mainly described through the differences, with the accompanying drawings.  FIG. 19  is a layout view of a thin film transistor array panel according to a second exemplary embodiment of the present invention,  FIG. 20  is a cross-sectional view taken along the line XX-XX of  FIG. 19 ,  FIG. 21  is a cross-sectional view taken along the line XXI-XXI of  FIG. 19 , and  FIG. 22  is a layout view only showing an organic light blocking member in the thin film transistor array panel shown in  FIG. 19 . 
     In the thin film transistor array panel according to the second exemplary embodiment of the present invention, a plurality of gate lines  121   u  and  121   d , and a plurality of storage electrode lines  131  including a plurality of storage electrodes  137  are formed on an insulating substrate  110 , and a gate insulating layer  140  is formed thereon. The storage electrode line  131  is disposed the same distance away from each of the two neighboring gate lines  121   u  and  121   d . The gate lines  121   u  and  121   d  are substantially similar. However, for better comprehension and ease of description in  FIG. 19 , the gate line  121   u  disposed in the upper side of the pixel and the gate line  121   d  disposed in the lower side are indicated by different numbers. The gate lines  121   u  and  121   d  respectively include wide end portions  129   u  and  129   d.    
     A plurality of semiconductor stripes  151   l  and  151   r  are formed on the gate insulating layer  140 . A plurality of ohmic contact stripes and islands  161   l ,  161   r ,  165   a ,  165   b ,  167   a ,  167   b  are formed on the semiconductor stripes  151   l  and  151   r . The ohmic contact stripes  161   l  and  161   r  have a plurality of protrusions  163   a  and  163   b . The protrusions  163   a  and  163   b  and the ohmic contact islands  165   a  and  165   b  form a pair and are disposed on the projections  154   a  and  154   b  of the semiconductor stripe  151 . The ohmic contact islands  167   a  and  167   b  are respectively elongated portions from the ohmic contact islands  165   a  and  165   b.    
     A plurality of left and right data lines  171   l  and  171   r  and a plurality of first and second drain electrodes  175   a  and  175   b  are formed on the ohmic contacts  161   l ,  161   r ,  165   a , and  165   b.    
     The first and second drain electrodes  175   a  and  175   b  respectively include wide end parts  177   a  and  177   b , and a bar-shaped end part. The wide end parts  177   a  and  177   b  are respectively closed to the right and the left data lines  171   r  and  171   l  and are overlapped with the storage electrodes  137 , respectively, and a part of the bar-shaped end part is surrounded with the curved source electrodes  173   a  and  173   b  with a “U” shape. 
     The first drain electrode  175   a  starts on the gate line  121   d  of the lower side of the pixel, runs upward (in the pixel), is curved in an oblique direction, and forms a wide end portion  177   a  positioned on the storage electrode  137  and neighboring the right data line  171   r . The second drain electrode  175   b  starts on the gate line  121   u  of the upper side of the pixel, runs downward (in the pixel), and forms a wide end portion  177   b  positioned on the storage electrode  137  and neighboring the left data line  171   r.    
     A passivation layer  180  is formed on the data lines  171   l  and  171   r  and the drain electrodes  175   a  and  175   b.    
     A light blocking member  220  is formed on the passivation layer  180 . The light blocking member  220  includes a first portion  221  extending in a vertical direction adjacent the data lines  171   l  and  171   r , protrusions  228   a  and  228   b  protruded in right and left directions from the first portion  221 , and second portions  227   a  and  227   b  covering the channels of the thin film transistors Qa and Qb. The first portion  221  extends adjacent the data lines  171   l  and  171   r  according to the data lines  171   l  and  171   r  in the vertical direction, and forms a dam. Referring to  FIG. 22 , the light blocking member  220  defines a plurality of spaces with a stripe shape for storing color filters  230 , and forms a plurality of storing spaces that extend in the vertical direction. 
     The protrusions  228   a  and  228   b  of the light blocking member  220  respectively include openings  229   a  and  229   b . The protrusions  228   a  and  228   b  extend from the first portion  221  toward the storage electrode  137 . In this way, the protrusions  228   a  and  228   b  include the openings  229   a  and  229   b , and contact holes  185   a  and  185   b  are respectively formed in the openings  229   a  and  229   b.    
     Here, the height of the light blocking member  220  is in the range of 1.5-4 μm for preventing the ink for the color filters from overflowing, and the width of the light blocking member  220  may be variously changed according to necessity. 
     Because the light blocking member  220  extend in the vertical direction and forms dams, the color filters  230  may be formed by depositing the ink in the storing spaces in the Inkjet process. Here, the protrusions  228   a  and  228   b  are disposed on the portions where the contact holes  185   a  and  185   b  are formed such that they may prevent the color filters  230  from remaining. 
     An overcoat layer  250  is formed on the light blocking member  220  and the color filters  230 . Also, the overcoat layer  250  is formed in a portion enclosed by the protrusions  228   a  and  228   b  of the light blocking member  220 . 
     The overcoat layer  250  and the passivation layer  180  have a plurality of contact holes  182   l ,  182   r ,  185   a , and  185   b  respectively exposing the end portions  179   l  and  179   r  of the data lines  171   l  and  171   r  and the end portions  177   a  and  177   b  of the drain electrodes  175   a  and  175   b . Also, the overcoat layer  250 , the passivation layer  180 , and the gate insulating layer  140  have a plurality of contact holes  181   u  and  181   d  respectively exposing the end portions  129   u , and  129   d  of the gate lines  121   u  and  121   d.    
     The contact holes  185   a  and  185   b  are disposed in the openings  229   a  and  229   b  of the protrusions  228   a  and  228   b , and are formed by simultaneously etching the overcoat layer  250  and the passivation layer  180 . Here, the inflow of the ink is prevented by the protrusions  228   a  and  228   b  on the portions where the contact holes  185   a  and  185   b  are formed in the Inkjet process. Accordingly, because the color filters  230  do not exist on the portion where the contact holes  185   a  and  185   b  are disposed, the passivation layer  180  and the overcoat layer  250  may be simultaneously etched to easily expose the drain electrodes  175   a  and  175   b.    
     A plurality of first and second sub-pixel electrodes  191   a  and  191   b  and a plurality of contact assistants  81   u ,  81   d ,  82   l , and  82   r  are formed on the overcoat layer  250 . Each second sub-pixel electrode  191   b  has a plurality of openings  91 ,  92   a ,  92   b ,  93   a , and  93   b    
     They may be preferably made of a transparent conductive material such as ITO or IZO, or a reflective metal such as aluminum, silver, or alloys thereof. 
     On the other hand, storage capacitors are formed by overlapping the end portions  177   a  and  177   b  of the drain electrodes  175   a  and  175   b , and the storage electrodes  137 . Compared to this, the storage capacitor in the first exemplary embodiment is formed by overlapping the sub-pixel electrodes  191   a  and  191   b , and the storage electrodes  137 . Accordingly, the second portions  223   a  and  223   b  are required for preventing the color filters  230  from forming on the storage electrode  137  when forming the storage capacitor in the first exemplary embodiment, but a light blocking member as in the first exemplary embodiment is not necessary in the second exemplary embodiment. Also, because the contact holes  185   a  and  185   b  are formed adjacent to the data lines  171   l  and  171   r  on the storage electrodes  137  in the second exemplary embodiment, the second exemplary embodiment may reduce a loss of aperture ratio compared with the first exemplary embodiment. Further, as shown in  FIG. 22 , the plurality of storing spaces filled by the color filters  230  are connected into one in the whole pixel column. Accordingly, it is easily to deposit or to spread the ink. 
     Exemplary Embodiment 3 
     The layered structure of the thin films in the thin film transistor array panel according to the third exemplary embodiment is the same as that of the first and second exemplary embodiments, and there are differences such as the disposition of the drain electrode  175   a  and  175   b  and the thin film transistors, the shape of the sub-pixel electrodes  191   a  and  191   b , the positions of the contact holes  185   a  and  185   b , and the shape of the light blocking member  220 . Hereafter, the third exemplary embodiment will be mainly described with the accompanying drawings with respect to the differences.  FIG. 23  is a layout view of a thin film transistor array panel according to a third exemplary embodiment of the present invention and  FIG. 24  is a layout view only showing an organic light blocking member in the thin film transistor array panel shown in  FIG. 23 . 
     A plurality of gate lines  121  and a plurality of storage electrode lines  131  are formed on an insulating substrate. The gate lines  121  include a plurality of gate electrodes  124   a  and  124   b , and the storage electrode lines  131  include a plurality of branches  133   a  and  133   b  extending in a vertical direction and a plurality of storage electrodes  137 . The storage electrode lines  131  are positioned the same distance away from each of the two neighboring gate lines  121 . 
     A plurality of left and right data lines  171   l  and  171   r  are formed by intersecting the gate lines  121  and the storage electrode lines  131 . Two gate electrodes  124   a  and  124   b  are disposed close to the left and right data lines  171   l  and  171   r , two protrusions  154   a  and  154   b  of the semiconductor stripes are disposed on the gate electrodes  124   a  and  124   b , and two source electrodes  173   a  and  173   b  that are respectively the branches of the left and right data lines  171   l  and  171   r  and the drain electrodes  175   a  and  175   b  are opposite thereon. 
     In  FIG. 23 , the shapes of the drain electrodes  175   a  and  175   b  are slightly different in the left and right pixels. Firstly, referring to the left pixel, the first drain electrode  175   a  among two drain electrodes  175   a  and  175   b  runs parallel to the data lines  171   l  and  171   r , is curved in the oblique direction, and finally forms a wide end portion on the storage electrode  137 . The second drain electrode  175   b  extends parallel to the data lines  171   l  and  171   r , is slightly curved close to the right data line  171   r , again extends parallel to the data line  171   l  and  171   r , intersects the storage electrode line  131 , is bent twice at a right angel to rotate on the circumference of the end portion of the first drain electrode  175   a , and finally forms a wide end portion on the storage electrode  137 . Accordingly, the wide end portion of the first drain electrode  175   a  is closer to the right data line  171   r  than the wide end portion of the second drain electrode  175   b . Next, in the right pixel, the first drain electrode  175   a  is once more curved before storage electrode  137 , extends parallel to the data lines  171   l  and  171   r , and forms a wide end portion on the storage electrode  137 , and the second drain electrode  175   b  intersects the storage electrode line  131 , is bent twice at a right angle, and forms a wide end portion on the storage electrode  137 . Accordingly, the wide end portion of the first drain electrode  175   a  is disposed further away from the right data line  171   r  than the wide end portion of the second drain electrode  175   b.    
     A passivation layer (not shown) is formed on the data lines  171   l  and  171   r  and the drain electrodes  175   a  and  175   b , and a light blocking member  220  is formed on the passivation layer. Referring to  FIG. 24 , the light blocking member  220  includes a first portion  221  extending in the vertical direction on the data lines  171   l  and  171   r , second portions  223   a  and  223   b  formed on the storage electrode lines  131 , a third portion  223   c  connected between the second portions  223   a  and  223   b , and fourth portions  227   a  and  227   b  covering the channels of the thin film transistors. 
     The first portion  221  covers the data lines  171   l  and  171   r  and extends according to the data lines  171   l  and  171   r  in the vertical direction to form a dam. The first portion  221  is wholly arranged with a stripe shape to define spaces for storing the color filters  230  in the vertical direction, and resultantly forms long storing spaces in the vertical direction. Here, the first portion  221  does not completely cover the data lines  171   l  and  171   r  but covers an area between two data lines  171   l  and  171   r  and the sides close to each other of the two data lines  171   l  and  171   r . Also, the second portions  223   a  and  223   b  are formed parallel to the storage electrode  137  on/under the lower storage electrode  137  in a horizontal direction to connect between the first portions  221 . The third portion  223   c  is disposed on the wide end portion of the first drain electrode  175   a  and the wide end portion of the second drain electrode  175   b , and connects between the second portions  223   a  and  223   b . The fourth portions  227   a  and  227   b  protrude from the first portion  221 , and cover the thin film transistors to prevent the light from being incident on the channels of the thin film transistors Qa and Qb. Here, the height of the light blocking member  220  is in the range of 1.5-4 μm to prevent the ink for the color filter from overflowing, and the width of the light blocking member  220  may be various as necessary. 
     In this way, because the first portion  221  extends in the vertical direction to form the dam, the color filters (not shown) may be formed by dripping a liquid material (hereinafter, ink) for forming the color filter in the Inkjet process. Here, because the second portions  223   a  and  223   b  are disposed adjacent to the storage electrode  137 , the color filter may be prevented from being formed on the storage electrode  137 , and accordingly the color filter may be prevented from covering the portion where the contact holes  185   a  and  185   b  are formed. 
     An overcoat layer (not shown) is formed on the light blocking member  220  and the color filter, and two sub-pixel electrodes  191   a  and  191   b  are formed on the overcoat layer. The two sub-pixel electrodes  191   a  and  191   b  are respectively connected to the drain electrodes  175   a  and  175   b  through contact holes  185   a  and  185   b  that pass through the overcoat layer and the passivation layer. The first sub-pixel electrode  191   a  extends to the data lines  171   l  and  171   r  and the gate line  121  to increase the aperture ratio. Here, because the boundaries of the first sub-pixel electrodes  191   a  of the two neighboring pixels are disposed on the first portion  221  of the light blocking member  220 , the etch uniformity may be ensured in the etching for forming them such that short-circuiting of two neighboring first sub-pixel electrodes  191   a  to each other may be prevented. Also, because the third portion  223   c  of the light blocking member  220  is disposed on the gap between two sub-pixel electrodes  191   a  and  191   b , steps generated due to the second portions  223   a  and  223   b  may be prevented. Accordingly, the etch uniformity may be ensured, and a short-circuit between two sub-pixel electrodes  191   a  and  191   b  may be prevented. 
     In the third exemplary embodiment, the end portions of the drain electrodes  175   a  and  175   b  are disposed on the storage electrode  137 , the contact holes  185   a  and  185   b  are disposed on the storage electrode  137 , and the light blocking member  220  is disposed on/under the storage electrode  137  such that the color filter is prevented from being formed on the storage electrode  137 . Accordingly, the storage capacitance may be sufficiently ensured and the contact holes  185   a  and  185   b  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.