Abstract:
A method of manufacturing a liquid crystal display at a reduced cost is presented. The method entails: preparing an insulating substrate; forming a gate line and a data line on the insulating substrate to define a pixel area; forming a thin film transistor at an intersection of the gate line and the data line; forming A passivation layer on the thin film transistor; positioning a mold having a concavo-convex pattern on the organic passivation layer, pressing the mold, and forming the concavo-convex pattern on the surface of the organic passivation layer. A pixel electrode on the organic passivation layer is formed.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority from Korean Patent Application No. 2005-006456 filed on Jul. 19, 2005 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND OF INVENTION 
       [0002]    1. Field of Invention 
         [0003]    The present invention relates to a manufacturing a transflective display device. 
         [0004]    2. Description of the Related Art 
         [0005]    Recently, display devices such as the liquid crystal display (LCD) device, plasma display panel (PDP), organic light emitting diode (OLED), and electro phoretic indication display, among others, have been gradually replacing the cathode ray tube (CRT) in various display applications. 
         [0006]    A liquid crystal display includes a thin film transistor substrate on which thin film transistors are formed, color filter substrate on which color filters are formed, and a liquid crystal panel having liquid crystal layers inserted between the thin film transistor substrate and the color filter substrate. Since the liquid crystal panel is a non-light-emitting element, a backlight unit is often mounted on a rear surface of the thin film transistor substrate to supply light. The amount of light emitted by the backlight unit that is transmitted through the liquid crystal layer is adjusted according to the arrangement state of the liquid crystal molecules in the layer. By controlling the light transmission, a desired image is displayed on the liquid crystal panel. 
         [0007]    The liquid crystal display can be classified into transmission type, reflective type, and transflective type according to the types of used light sources. The transmission-type liquid crystal display allows light (e.g., light from a backlight unit) to pass through the liquid crystal panel, thereby displaying images of a consistently high quality regardless of the amount of light available in the environment. The reflective-type liquid crystal display, in which reflective layers are formed on the entire surface of pixel electrodes, utilizes light in the environment to display images. An advantage of the reflective-type liquid crystal display is that it does not rely on the backlight unit as the sole source of light, thus consuming only about 30% of the amount of power that is consumed by the transmission-type liquid crystal display. A reflective-type liquid crystal display includes reflective layers that reflect the light from the environment and uses the reflected light to display images. 
         [0008]    The transflective-type liquid crystal display combines the transmission-type liquid crystal display&#39;s ability to consistently produce high-quality images with the reflective-type liquid crystal display&#39;s ability to operate at low power consumption. The transflective-type liquid crystal display can implement high picture quality, is small in size, light in weight, and has low power consumption requirement. Particularly, the transflective-type liquid crystal display uses the light in the environment and a backlight unit to ensure a proper brightness level regardless of changes in the environment. Advantageously, this ability to modulate the brightness not only ensures that the images will be adequately bright but also makes adjustments according to lighting conditions. For example, a transflective-type liquid crystal display allows users to view still and moving images as well as character information even under direct sunlight. 
         [0009]    When the thin film transistor substrate of the transflective liquid crystal display is manufactured, an organic passivation layer is applied to substantially the entire surface of a mother substrate, concavo-convex pattern is formed using a slit mask in the surface of the organic passivation layer formed on insulating substrate to be used as the thin film transistor substrate, and then pixel electrodes and reflective layers are sequentially formed. The concavo-convex pattern is used to induce diffused reflection and light scattering of the reflective layers. 
         [0010]    The concavo-convex pattern may be formed by a half exposure method or a planarization method. The half exposure method entails performing a photolithography process multiple times to form the concavo-convex patterns, contact holes, etc., and thus requires long manufacturing time and high manufacturing cost. As for methods using the slit mask, they cannot induce appropriate diffused reflection and scattering since the yield and reflection efficiency of the concavo-convex patterns are low. 
         [0011]    A method of forming the concavo-convex pattern in the thin film transistor substrate without the above problems is desired. 
       SUMMARY OF THE INVENTION 
       [0012]    Accordingly, it is an aspect of the present invention to provide a method for manufacturing a display device that is capable of enhancing the yield and reflection efficiency of concavo-convex patterns and simplifying manufacturing processes. 
         [0013]    Additional features of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. 
         [0014]    In one aspect, the invention is a method of manufacturing a display device. The method entails: preparing an insulating substrate; forming a gate line and a data line on the insulating substrate, the gate line and the data line extending in directions that are perpendicular to each other while remaining insulated from each other, the gate line and the data line define a pixel area forming a thin film transistor at an intersection of the gate line and the data line; forming an organic passivation layer on the thin film transistor; positioning a mold having a concavo-convex pattern such that the concavo-convex pattern is aligned with the pixel area on the organic passivation layer; pressing the mold, and forming the concavo-convex pattern on the surface of the organic passivation layer; and forming a pixel electrode on the organic passivation layer. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    The above and/or other aspects and advantages of the prevent invention will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings, in which: 
           [0016]      FIG. 1  is a plane view illustrating a mother substrate substance according to a first embodiment of the present invention; 
           [0017]      FIG. 2  is a layout of the area ‘A’ marked in  FIG. 1 ; 
           [0018]      FIG. 3  is a cross-sectional view cut along the dotted line III-III of  FIG. 2 ; 
           [0019]      FIGS. 4A through 4E  are cross-sectional views cut along the line IV-IV of  FIG. 1 , for explaining a process of manufacturing a thin film transistor substrate; 
           [0020]      FIGS. 5A ,  5 B and  5 C are cross-sectional views for explaining a process of manufacturing a thin film transistor substrate, according to a second embodiment of the present invention; and 
           [0021]      FIGS. 6A through 6E  are cross-sectional views for explaining a process of manufacturing a thin film transistor substrate, according to a third embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0022]    Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below to explain the present invention in reference to the figures. 
         [0023]    It will be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substance, or intervening layers may also be present. 
         [0024]      FIG. 1  is a plan view illustrating a mother substrate substance according to a first embodiment of the present invention,  FIG. 2  is a layout of the area ‘A’ marked in  FIG. 1 , and  FIG. 3  is a cross-sectional view cut along the dotted line III-III of  FIG. 2 . 
         [0025]    Referring to  FIGS. 1 ,  2  and  3 , a liquid crystal panel  1  according to a first embodiment of the present invention includes a thin film transistor substrate (first substrate)  100 , color filter substrate (second substrate)  200 , and a liquid crystal layer  300  positioned between the first substrate  100  and the second substrate  200 . 
         [0026]    First, the thin film transistor substrate  100  will be described below. 
         [0027]    As shown in  FIG. 1 , a plurality of first substrates  100  are manufactured from a large mother substrate substance  10  by a well-known thin film transistor substrate manufacturing process. Although  FIG. 1  illustrates that 24 insulating substrates  110  can be made from the mother substrate substance  10 , this is an example and not meant to be limiting. An organic passivation layer formed on areas (hereinafter, referred to as peripheral areas) between insulating substrates  110  will be removed during the following exposure and developing processes. 
         [0028]      FIG. 2  is an expanded diagram of the area ‘A’ marked in  FIG. 1 . Referring to  FIGS. 2 and 3 , a gate line  121 , a gate electrode  122 , and a gate pad  123 , herein collectively referred to as “gate wires,” are formed on the first insulating substrate  110 . The gate wires can be formed as a single metal layer or a plurality of metal layers. The gate line  121  extends in a first direction, the gate electrode  122  is connected to the gate line  121 , and the gate pad  123  is connected to a gate driver (not shown) for receiving a driving signal. 
         [0029]    A gate insulating film  130  made of a silicon nitride SiN x , etc. is deposited over the first insulating substrate  110  and the gate wires. 
         [0030]    A semiconductor layer  140  made of a semiconductor, such as amorphous silicon, etc., is formed on the gate insulating film  130  in the region on and around the gate electrode  122 . An ohmic contact layer  150  made of a material such as n+ hydride amorphous silicon, etc., in which silicide or n-type impurities is doped with a high concentration, is formed on the semiconductor layer  140 . There is no ohmic contact layer  150  on the channel area between a source electrode  162  and a drain electrode  163 . 
         [0031]    A data line  161 , a source electrode  162 , and a drain electrode  163 , herein collectively referred to as “data wires”, are formed on the resistor contact layer  150  and the gate insulating film  130 . The data wires can be formed as a single layer or a plurality of layers, wherein at least one of the layers is made of a metal. The data line  161  extends in a direction that is perpendicular to the gate line  121  while remaining electrically insulated from the gate line  121 . The data line  161  and the gate line  121  define pixels. The source electrode  162  extends from the data line  161  and covers the ohmic contact layer  150 . The drain electrode  163  is separated from the source electrode  162  and covers the ohmic contact layer  150  across the gate electrode  122  from the source electrode  162 . 
         [0032]    An organic passivation layer  170  is formed on the data wires and the exposed surfaces of the semiconductor layer  140 . A concavo-convex pattern  175 , a drain contact hole  171  for exposing the drain electrode  163 , and a gate pad contact hole  172  are formed on the organic passivation layer  170 . Also formed on the organic passivation layer  170  are a data pad contact hole  173  connected to a gate driver (not shown) and a data driver (not shown) for applying driving signals to the gate line  121  and the data line  161 . The concavo-convex pattern  175  formed in the surface of the organic passivation layer  170  induces light scattering and thus enhances reflectivity. In order to enhance the reliability of a thin film transistor T, an inorganic insulating film (not shown) such as a silicon nitride can be additionally formed between the organic passivation layer  170  and the thin film transistor T. Here, the organic passivation layer  170  may be a highly viscous organic layer whose shape can be maintained. The organic passivation layer  170  has a viscosity of 10,000 cp or more. 
         [0033]    A pixel electrode  180  is formed on the upper surface of the organic passivation layer  170  in which the concavo-convex pattern  175  is formed. The pixel electrode  180  is made of a transparent conductive material such as an indium tin oxide (ITO) or an indium zinc oxide (IZO). The pixel electrode  180  is electrically connected to the drain electrode  163  through the drain contact hole  171 . Then, secondary contact members  181  and  182  are formed on the gate pad contact hole  172  and the data pad contact hole  173 . The secondary contact members  181  and  182  are generally made of a transparent conductive material, such as ITO or IZO. A concavo-convex pattern is automatically formed on the surface of the pixel electrode  180 , which is formed to have a substantially constant thickness on the concavo-convex pattern  175 . 
         [0034]    A reflective layer  190  is formed on the pixel electrode  180 . A pixel area defined by the gate line  121  and the data line  161  is divided into a transmission area on which no reflective layer  190  is formed and a reflective area on which the reflective layer  190  is formed. In the transmission area, light emitted from a backlight unit (not shown) is transmitted and exits the liquid crystal panel  1 . In the reflective area on which the reflective layer  190  is formed, the light incident from the outside is reflected before exiting the liquid crystal panel  1 . The reflective layer  190  is made primarily of aluminium or silver. Alternatively, the reflective layer  190  may be formed as a double-layer structure of aluminium and molybdenum. As described above, the reflective layer  190  is formed on the pixel electrode  180 . Then, a concavo-convex pattern is formed on the surface of the reflective layer  190  because of the concavo-convex pattern formed on the surface of the pixel electrode  180 . 
         [0035]    Now, the color filter substrate  200  will be described. 
         [0036]    A black matrix  220  is formed on a second insulating substrate  210 . The second insulating substrate  210  may be prepared from the mother substrate substance  10  similarly to the first insulating substrate  110 . The black matrix  220  is generally used to separate red, green and blue filters from each other and prevent light from being directly emitted to the thin film transistor T positioned on the first substrate  100 . The black matrix  220  is generally made of a photosensitive organic material containing a black pigment. The black pigment may be carbon black or titanium oxide, etc. 
         [0037]    Then, color filters  230  ( 230  for each) are arranged in such a manner that red, green and blue filters are repeatedly formed between black matrices  220 . Each color filter  230  acts to impart a color to the white light that is emitted by the backlight unit (not shown) has after it passed through the liquid crystal layer  300 . The color filter  230  is generally formed with a photosensitive organic material. 
         [0038]    An overcoat layer  240  is formed on the color filter  230  and the exposed surface of the black matrix  220  on which no color filter  230  exists. The overcoat layer  240  protects the color filter  230  and planarizes a surface of the color filter  230 . The overcoat layer is mainly formed with an acrylic epoxy material. 
         [0039]    Then, a common electrode  250  is formed on the entire surface of the overcoat layer  240 . The common electrode  250  is made of a transparent conductive material such as ITO or IZO. The common electrode  250  and the pixel electrode  180  of the thin film transistor substrate  100  directly apply a voltage to the liquid crystal layer  300 . 
         [0040]    Then, the liquid crystal layer  300  is injected between the thin film transistor substrate  100  and the color filter substrate  200 , and the substrates  100  and  200  are coupled by a sealant (not shown). 
         [0041]    Hereinafter, a method for manufacturing a liquid crystal display according to a first embodiment of the present invention will be described. Specifically, a method for manufacturing a thin film transistor substrate is described. 
         [0042]      FIGS. 4A through 4E  are cross-sectional views of the insulating substrate  110  cut along the line IV-IV of  FIG. 1 . The process for forming a concavo-convex pattern  175  in an organic passivation layer  170  of a first substrate  100  will be described in reference to  FIGS. 4A through 4E . 
         [0043]    First, as shown in  FIGS. 2 and 3 , after a gate wire material is deposited on a first insulating substrate  110 , patterning is performed by a photolithographic process using a mask. The photolithographic process produces the gate line  121 , the gate electrode  122 , the gate pad  123 , etc. Then, a gate insulating film  130 , a semiconductor layer  140 , and a resistor contact layer  150  are sequentially applied. 
         [0044]    Thereafter, by performing a photolithographic process on the semiconductor layer  140  and the resistor contact layer  150 , a resultant semiconductor layer  140  is formed on the gate insulating film  130  over the gate electrode  122 . The resistor contact layer  150  is formed on the semiconductor layer  140 . 
         [0045]    Then, after a data wire material is applied, patterning is performed by a photolithographic process using a mask so that the data line  161 , the source electrode  162 , and the drain electrode  163  are formed. The exposed surface of the ohmic contact layer  150  is etched, so that the ohmic contact layer  150  is divided into two parts with the gate electrode  122  in between the two parts. The etching of the ohmic contact layer  150  exposes a part of the semiconductor layer  140 . During this etching process, the portion of the ohmic contact layer  150  that is above the gate electrode  122  is almost completely removed and the portion of the semiconductor layer  140  that is above the gate electrode  122  is partially etched to leave a thinner layer than before. To stabilize the surface of the exposed semiconductor layer  140 , the etching is preferably carried out using oxygen plasma. 
         [0046]    Then, an organic passivation layer  170  is formed using a spin coating method or a slit coating method, although other methods may be suitable as well. To enhance the reliability of the thin film transistor T, an inorganic insulating layer, such as a silicon nitride, can be additionally formed between the organic passivation layer  170  and the thin film transistor T. Here, the organic passivation layer  170  may be a highly viscous organic layer whose shape can be maintained. The organic passivation layer  170  has a viscosity of 10,000 cp or more. 
         [0047]      FIG. 4A  shows a mold  400  having a concavo-convex pattern  410  positioned over the organic passivation layer  170 . The concavo-convex pattern  410  is aligned and positioned on the organic passivation layer  170  so that the concavo-convex pattern will be formed on the organic passivation layer  170  in the pixel area. Then, as shown in  FIG. 4B , the mold  400  is placed in contact with and pressed against the organic passivation layer  170  (in the direction indicated by the arrows). As a result of this pressing, a concavo-convex pattern  175  is formed on the surface of the organic passivation layer  170 . 
         [0048]    Thereafter, as shown in  FIG. 4C , the mold  400  is removed. Since the organic passivation layer  170  is a highly viscous organic layer, the shape of the concavo-convex pattern  175  is maintained when the mold  400  is removed. At this time, a release agent may be applied to the surface of the mold  400  to facilitate the removal of the mold  400 . 
         [0049]    After the mold  400  is removed, as shown in  FIG. 4D , a mask  500  having an opening to expose the concavo-convex pattern  175  is aligned with the concavo-convex pattern  175 , and irradiated with an ultraviolet ray. Then, as shown in  FIG. 4E , a developing process is performed to remove the parts of the organic passivation layer  170  where no concavo-convex pattern  175  is formed. The portion of the organic passivation layer  170  that is removed correspond to the peripheral areas. During the developing process, drain contact holes  171 , gate pad contact holes  172  and data pad contact holes  173  may be formed at the same time the peripheral organic passivation layer  170  is removed. 
         [0050]    Meanwhile, in the current embodiment, the organic passivation layer  170  having the concavo-convex pattern  175  is formed using a photosensitive organic material which is removed when not cured by ultraviolet radiation. However, in other cases, the organic passivation layer  170  having the concavo-convex pattern  175  may be formed using a photosensitive organic material that is removed by exposure to the ultraviolet radiation. In this latter case, the opening in the mask  500  is shifted so that the opening is positioned above the part of the organic passivation layer area  170  to be removed. 
         [0051]    After the concavo-convex pattern  175  is prepared, ITO or IZO is applied to the organic passivation layer  170  and the photolithographically patterned to form a pixel electrode  180 . The pixel electrode  180  is connected to the drain electrode  163  through the drain contact hole  171 . The pixel electrode  180  has a concavo-convex pattern due to the concavo-convex pattern  175  in a lower part. Then, secondary contact members  181  and  182  which are respectively connected to the gate pad  123  and a data pad  164  through the gate pad contact hole  172  and the data pad contact hole  173  are respectively formed. 
         [0052]    After the pixel electrode  180  is formed, a reflective material is formed on the pixel electrode  180  and patterned to form a reflective layer  190  on at least one part of the pixel electrode  180 . The reflective layer  190  can be composed of silver, chrome, a silver-chrome alloy, or a double layer of aluminium and molybdenum. The reflective layer  190  is formed in areas (reflective areas) that are not transmission areas. Due to the concavo-convex pattern  175  described above, the reflective layer  190  also has the concavo-convex pattern. The reflective layer  190  receives electrical signals from the pixel electrode  180  and applies the received signals to the liquid crystal layer  300  positioned on the reflective layer  190 . 
         [0053]    Thereafter, an alignment film (not shown) is formed and thus a thin film transistor substrate  100  according to a first embodiment of the present invention is prepared. 
         [0054]    The black matrix  220 , the color filter  230 , the overcoat layer  240 , a common electrode  250  and an alignment film are formed on a second insulating substrate  210  by a well-known method, thereby making the second substrate  200 . Finally, by coupling the first substrate  100  to the second substrate  200  and injecting liquid crystal therebetween, a liquid crystal panel  1  is prepared. 
         [0055]    According to the above-described method, the concavo-convex pattern  175  is formed by using the mold  400  without using a slit mask. Thus, one fewer photolithography process is needed compared to the conventional half exposure method and planarization method. 
         [0056]    If the concavo-convex pattern  175  were formed by using a slit mask, the concavo-convex pattern  175  likely will not cause appropriate light scattering because the yield and reflection efficiency of the formed concavo-convex pattern  175  are low with the slit mask. Excessive scattering causes the image to become dark because it allows the color filter substrate  200  and a deflection plate to absorb a large amount of light. Conversely, insufficient scattering causes problems in a viewing angle because light is concentrated in a specific direction. Furthermore, since the liquid crystal panel  1  has a multi-layer structure with different refraction indexes, light that is reflected at an angle greater than a threshold angle may not be able to exit the liquid crystal panel  1 . 
         [0057]    However, in the manufacturing method according to the present invention, since the concavo-convex pattern  175  is formed using the high-quality mold  400 , the yield and reflection efficiency of the concavo-convex pattern  175  are enhanced. Thus, the concavo-convex pattern formed with the method described herein produces appropriate diffused reflection and scattering. In addition, the manufacturing process of the invention is simpler than the conventional manufacturing method that involves multiple photolithographic process steps. 
         [0058]    Hereinafter, a second embodiment of the present invention will be described with reference to  FIGS. 5A ,  5 B and  5 C. Descriptions for the same processes as in the first embodiment will be omitted and difference from the first embodiment will be described. 
         [0059]      FIGS. 5A through 5C  are schematic views for explaining a method of forming a concavo-convex pattern  175  in an organic passivation layer  170  of a first substrate  100 . 
         [0060]    Referring to  FIG. 1 , the insulating substrates  110  that are used as thin film transistor substrate  100  are manufactured from a large mother substrate substance  10 . The mother substrate substance  10  has multiple substrate areas that will become the insulating substrates  110 . Peripheral areas, which are parts of the mother substrate substance  10  that will not be formed into insulating substrates  110 , separate the insulating substrates  110 . 
         [0061]    As shown in  FIG. 5A , an organic passivation layer  170  is formed on a first insulating substrate  110 . Here, the organic passivation layer  170  is a small molecule organic layer, different from the first embodiment. The organic passivation layer  170  has a viscosity of 1 cp to 100 cp. 
         [0062]    The small-molecule organic layer is hardened by ultraviolet radiation or heat treatment. In the second embodiment, the mold  400  has a concavo-convex pattern  410  in the areas that will be aligned with a pixel area or a substrate area. In addition, the mold  400  has a protection film removing portion  420  positioned to align with the peripheral area of the mother substrate substance  10 . The protection film removing portion  420  is extruded toward the organic passivation layer  170 . Preferably, as shown in  FIG. 5B , the protection film removing portion  420  is formed with a predetermined height so that it comes in contact with the insulating substrate  110  when the mold  400  is pressurized in the direction shown by the arrows. Here, in order to harden the organic passivation layer  170  while maintaining the concavo-convex pattern  175 , the mold  400  is preferably made of a transparent material that can transmit ultraviolet radiation. The transparent material used for forming the mold  400  may be polydimethylsilixane (PDMS) Unlike in the process of  FIG. 4D , no mask is utilized in this method. 
         [0063]    Then, as shown in  FIG. 5B , by pressuring the mold  400 , the organic passivation layer  170  is positioned in the area between the insulating substrates  110 , i.e., in the peripheral area. The organic passivation layer  170  is removed by the protection film removing portion  420 , and the concavo-convex pattern  175  is formed by the concavo-convex pattern  410  of the mold  400 . Ultraviolet radiation is used to harden the concavo-convex pattern  175  after it is formed by the mold  400 . Then, the mold  400  is removed as shown in  FIG. 5C , thereby completing a resultant high-quality concavo-convex pattern  175 . 
         [0064]    Although not shown in the drawings, the organic passivation layer  170  that is not removed by the protection film removing portion  420  can remain on the insulating substrate  110 . In this case, the remaining organic passivation layer  170  can be removed though a separate ashing process. 
         [0065]    Therefore, in the manufacturing method according to the present invention, since the concavo-convex pattern  175  is formed using the high-quality mold  400  and hardening is carried out. In the state where the concavo-convex pattern  175  is formed, the yield and reflection efficiency of the concavo-convex pattern  175  can be enhanced and appropriately diffused reflection and scattering can be induced. Furthermore, since the concavo-convex pattern  175  is formed using the mold  400 , the manufacturing process can be simplified compared to the conventional method utilizing a slit mask. Particularly, since exposure and developing processes can be omitted, manufacturing method can be simplified and manufacturing costs can be reduced. 
         [0066]    Hereinafter, a third embodiment of the present invention will be described with reference to  FIGS. 6A through 6E , wherein descriptions for the same processes as in the first embodiment will be omitted and difference from the first embodiment will be described. 
         [0067]      FIGS. 6A through 6E  are schematic views for explaining a method of forming the concavo-convex pattern  175  in the organic passivation layer  170  of the first substrate  100 . 
         [0068]    As shown in  FIG. 6A , the concavo-convex pattern  175  is formed on the surface of the organic passivation layer  170  on a first insulating substrate  110 , similarly to the first embodiment. In case where the organic passivation layer  170  is an organic layer having low viscosity, the concavo-convex pattern  175  can be formed through molding and hardening. 
         [0069]    Thereafter, as shown in  FIG. 6B , a photosensitive layer  600  can be formed on the entire surface of the organic passivation layer  170  with the concavo-convex pattern  175 . Then, as shown in  FIG. 6C , exposure and developing processes are performed using a mask (not shown) and thus the photosensitive layers  600  formed on peripheral areas without the concavo-convex pattern  175  are removed. 
         [0070]    Successively, as shown in  FIG. 6D , the organic passivation layers  170  of the peripheral areas without the concavo-convex pattern  175 , are removed using the photosensitive layer  600  formed on the concavo-convex pattern  175  as a barrier wall. The organic passivation layers  170  of the peripheral areas can be removed by etching. 
         [0071]    Finally, as shown in  FIG. 6E , by removing the photosensitive layer  600  on the concavo-convex pattern  175 , a high-quality concavo-convex pattern  175  is formed. The photosensitive layer  600  formed on the concavo-convex pattern  175  can be removed by ashing or stripping. 
         [0072]    As described above, the present invention makes it possible to enhance the yield and reflection efficiency of the concavo-convex pattern and simplify a manufacturing method of the transflective liquid crystal display. 
         [0073]    The invention is not limited to the embodiments described and shown and a plurality of modifications and combinations of details from the different embodiments are possible within the scope of the claims. The invention can be used to make at least one of an organic light emitting diode, a flat panel display, and an electro phoretic indication display. 
         [0074]    Although a few exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.