Abstract:
Provided is a method for manufacturing an in-plane switching mode liquid crystal display, which can prevent the problem of bubble generation caused by an Ag dot during the attachment process of a liquid crystal panel and a cover substrate, and improve the yield of an Ag dot process. A method for manufacturing an in-plane switching mode liquid crystal display according to an embodiment of the present invention may comprise: forming a liquid crystal panel by interposing a liquid crystal layer between a color filter substrate and a TFT array substrate; attaching a polarizer, with a protective film attached thereon, on the color filter substrate; forming an Ag dot to be in contact with an edge of the protective film, the color filter substrate, and the TFT array substrate; removing part of the Ag dot by removing the protective film; and attaching a cover substrate on the color filter substrate.

Description:
This application claims the benefit of Korean Patent Application No. 10-2011-0036664 filed on Apr. 20, 2011, which is hereby incorporated by reference. 
     BACKGROUND 
     1. Field 
     This document relates to a method for manufacturing an in-plane switching mode liquid crystal display, and more particularly to, a method for manufacturing an in-plane switching mode liquid crystal display, which can prevent the problem of bubble generation caused by an Ag dot during the attachment process of a liquid crystal panel and a cover substrate, and improve the yield of an Ag dot process. 
     2. Related Art 
     Recently, with the development of various portable electronic devices, such as mobile phones, PDAs, notebook computers, etc., a light, thin, small flat panel display device has been in great demand. Research and development are actively conducted for the flat panel display devices, such as an LCD, a PDP (Plasma Display Panel), an FED (Field Emission Display), etc. Among these devices, the LCD attracts much more attention because of its simple mass-production technique, easy driving system, and implementation of a high picture quality. 
     There are various display modes, such as TN and VA, for the LCD device according to arrangement of liquid crystal molecules. Currently, a TN (twisted pneumatic) mode LCD device is being generally utilized because of short response time and low driving voltage. When a voltage is applied to the TN mode LCD device, liquid crystal molecules aligned to be horizontal to a substrate are aligned to be nearly perpendicular to a surface of the substrate. Accordingly, there is a problem in that a viewing angle is narrowed by refractive anisotropy of the liquid crystal molecules in applying of the voltage. 
     In order to solve this problem, LCD devices of in-plane switching modes having wide viewing angle characteristics have been proposed. 
       FIG. 1   a  is a view showing a structure of a conventional in-plane switching mode liquid crystal display.  FIG. 1   b  is a view showing a conventional method for manufacturing an in-plane switching mode liquid crystal display. 
     Referring to  FIG. 1   a , the in-plane switching mode liquid crystal display  1  comprises a liquid crystal panel LP comprising a TFT array substrate  3  having thin film transistors, a common electrode, pixel electrodes, and a driving IC  4 , a color filter substrate  5  having rear ITO and color filters, and a liquid crystal layer (not shown) interposed between the substrates. A lower polarizer  7  is disposed under the TFT array substrate  3 , and an upper polarizer  8  is disposed on top of the color filter substrate  5 . 
     An Ag dot  10  connecting the rear ITO of the color filter substrate  5  and the ground of the TFT array substrate  3  is disposed on the bonded edge of the TFT array substrate  3  and the color filter substrate  5 . And, a cover substrate  12  is attached and disposed on the liquid crystal panel LP through an OCA (Optical Clear Adhesive) film  13 . 
     A process for forming the Ag dot is performed by a manual or automatic process. In particular, in the manual process, the size of the Ag dot  10  may be increased depending on a manufacturer. Also, in the automatic process, the cohesiveness of Ag paste is made low in order to prevent a nozzle for applying the Ag dot from being blocked. Due to this, the size of the Ag dot may be increased after the application of the Ag paste. 
     Accordingly, as shown in  FIG. 1   b , the Ag dot  10  intrudes into the area to which the cover substrate  12  is bonded, thus causing the problem that bubbles are produced between the OCA film  13  and the upper polarizer  8 . Therefore, the yield of the bonding process of the cover substrate and the liquid crystal panel and the Ag dot process is low. 
     SUMMARY 
     An aspect of this document is to provide a method for manufacturing an in-plane switching mode liquid crystal display, which can prevent the problem of bubble generation caused by an Ag dot during the attachment process of a liquid crystal panel and a cover substrate, and improve the yield of an Ag dot process. 
     A method for manufacturing an in-plane switching mode liquid crystal display according to an aspect of the present invention may comprise: forming a liquid crystal panel by interposing a liquid crystal layer between a color filter substrate and a TFT array substrate; attaching a polarizer, with a protective film attached thereon, on the color filter substrate; forming an Ag dot to be in contact with an edge of the protective film, the color filter substrate, and the TFT array substrate; removing part of the Ag dot by removing the protective film; and attaching a cover substrate on the color filter substrate. 
     A method for manufacturing an in-plane switching mode liquid crystal display according to another aspect of the present invention may comprise: forming a liquid crystal panel by interposing a liquid crystal layer between a color filter substrate and a TFT array substrate; attaching a polarizer, with a protective film attached thereon, on the color filter substrate, the protective film having an open portion; forming an Ag dot to be in contact with an edge of the protective film, the polarizer, the color filter substrate, and the TFT array substrate; removing part of the Ag dot by removing the protective film; and attaching a cover substrate on the color filter substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompany drawings, which are included to provide a further understanding of the invention and are incorporated on and constitute a part of this specification illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. 
         FIG. 1   a  is a view showing a structure of a conventional in-plane switching mode liquid crystal display, and  FIG. 1   b  is a view showing a conventional method for manufacturing an in-plane switching mode liquid crystal display; 
         FIG. 2  is a plane view showing an in-plane switching mode liquid crystal display according to the present invention; 
         FIG. 3  is a cross-sectional view taken along line I-I′ of  FIG. 2 ; 
         FIG. 4  is a view showing an in-plane switching mode liquid crystal display according to a first exemplary embodiment of the present invention; 
         FIGS. 5   a  to  5   c  are views showing in steps a method for manufacturing an in-plane switching mode liquid crystal display according to the first exemplary embodiment of the present invention; 
         FIGS. 6   a  to  6   c  are views showing in steps a method for manufacturing an in-plane switching mode liquid crystal display comprising a touch panel according to the first exemplary embodiment of the present invention; 
         FIG. 7  is a view showing an in-plane switching mode liquid crystal display according to a second exemplary embodiment of the present invention; 
         FIGS. 8   a  to  8   d  are views showing in steps a method for manufacturing an in-plane switching mode liquid crystal display according to a second exemplary embodiment of the present invention; 
         FIGS. 9   a  to  9   c  are views showing in steps a method for manufacturing an in-plane switching mode liquid crystal display comprising a touch panel according to the second exemplary embodiment of the present invention; 
         FIG. 10  is a view showing the in-plane switching mode liquid crystal display manufactured according to the first exemplary embodiment of the present invention; and 
         FIG. 11   a  is a view showing a liquid crystal display having an Ag dot applied thereto,  FIG. 11   b  is a view showing a liquid crystal display having a protective film removed therefrom, and  FIG. 11   c  is a view showing the removed protective film. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail embodiments of the invention examples of which are illustrated in the accompanying drawings. 
       FIG. 2  is a plane view showing an in-plane switching mode liquid crystal display according to the present invention.  FIG. 3  is a cross-sectional view taken along line I-I′ of  FIG. 2 . In the following, the in-plane switching mode liquid crystal display will be described by taking one subpixel as an example. 
     Referring to  FIG. 2 , a gate line  103  extended and arranged in one direction is disposed on a substrate (not shown), and a data line  107  crossing the gate line  103  and defining a subpixel P is disposed thereon. Also, a common line  109  crossing the data line  107  and arranged in parallel to the gate line  103  is disposed thereon. The subpixel P is defined by the crossings of the gate line  103 , the data line  107 , and the common line  109 . 
     In the subpixel P, a thin film transistor TFT is disposed, which comprises a gate electrode  104  extending from the gate line  103 , a gate insulation film (not shown), a semiconductor layer (not shown), a source electrode  117  electrically connected to the data line  107 , and a drain electrode  119  separated from the source electrode  117 . 
     In this drawing, the thin film transistor TFT is illustrated such that the channel forming area has an I-shape, but not limited thereto and may have a U-shape. Also, the thin film transistor TFT is illustrated as protruding from the gate line  103  to the subpixel P, but not limited thereto and the gate electrode  103  may be the gate line  103  itself. 
     Inside the subpixel P, a branched electrode  123  is connected to the common line  109  and a contact hole CH 1 . Also, a pixel electrode  135  alternating with the common electrode  123  is disposed corresponding to the branched common electrode  123 . Here, the pixel electrode  135  is connected to the drain electrode  119  of the thin film transistor TFT. 
     Hereinafter, a cross-sectional structure of the aforementioned in-plane switching mode liquid crystal display of the present invention depending on a plane structure thereof will be described. 
     Referring to  FIG. 3 , in the in-plane switching mode liquid crystal display of the present invention, the gate electrode  104  extending from the gate line (not shown) arranged in one direction is disposed on the TFT array substrate  101 , and the common electrode  123  is disposed on the same plane. 
     A gate insulation film  106  for insulating the gate electrode  104  and the common electrode  123  is disposed on the gate electrode  104  and the common electrode  123 , and a semiconductor layer  115  corresponding to the gate electrode  103  is disposed on the gate insulation film  106 . The source electrode  117  and the drain electrode  119  are respectively disposed on both side ends of the semiconductor layer  115 , thereby configuring a thin film transistor TFT comprising the gate electrode  103 , the semiconductor layer  115 , the source electrode  117 , and the drain electrode  119 . 
     The pixel electrode  135  disposed to be alternate with the common electrode  123  is disposed on the gate insulation film  106 . A passivation film  125  covering the source electrode  117 , the drain electrode  119 , and the pixel electrode  135  is disposed, thereby configuring the TFT array substrate  101 . 
     A color filter substrate  140  facing the TFT array substrate  101  is disposed. R, G, and B color filters  144  are disposed on the bottom face of the color filter substrate  140 , and a black matrix  142  is disposed between the color filters  144 . An overcoat layer  145  is disposed on the color filters  144 , and rear ITO  160  for preventing static electricity is disposed on top of the color filter substrate  140 , thereby configuring the color filter substrate  140 . 
     A liquid crystal layer  150  is interposed between the TFT array substrate  101  and the color filter substrate  140 , thereby configuring the in-plane switching mode liquid crystal display of the present invention. 
     Hereinafter, the Ag dot process and the bonding process of the cover substrate and the liquid crystal panel according to the aforementioned in-plane switching mode liquid crystal display will be described below. 
       FIG. 4  is a view showing an in-plane switching mode liquid crystal display according to a first exemplary embodiment of the present invention.  FIGS. 5   a  to  5   c  are views showing in steps a method for manufacturing an in-plane switching mode liquid crystal display according to the first exemplary embodiment of the present invention. 
     Referring to  FIG. 4 , in the in-plane switching mode liquid crystal display  100  of the present invention, a liquid crystal panel LP formed by bonding the TFT array substrate  101  and the color filter substrate  140  is disposed, with a liquid crystal layer (not shown) interposed therebetween, the rear ITO  160  and an upper polarizer  165   a  are disposed on the color filter substrate  140 , and a lower polarizer  165   b  is disposed under the TFT array substrate  101 . 
     An Ag dot  170  connecting the rear ITO  160  of the color filter substrate  140  and the ground of the TFT array substrate  101  is disposed on an edge of the liquid crystal panel LP, i.e., an edge of the TFT array substrate  101  and the color filter substrate  140 . The cover substrate  180  is attached and disposed on the liquid crystal panel LP through an OCA film  185 . 
     Referring to  FIG. 5   a , the method for manufacturing the in-plane switching mode liquid crystal display of  FIG. 4  will be described. A thin film transistor, a common electrode, and a pixel electrode are formed on a substrate, thereby preparing a TFT array substrate  101 , and a black matrix, color filters, an overcoat layer, and rear ITO are formed on another substrate, thereby preparing a color filter substrate  140 . 
     Next, the TFT array substrate  101  and the color filter substrate  140  are bonded together, and liquid crystal is injected therein to prepare a liquid crystal panel LP. After that, a driving IC  155  is bonded to the edge of the TFT array substrate  101  of the liquid crystal panel PL. Then, an upper polarizer  165   a  with an upper protective film  167   a  attached thereon is attached on top of the color filter substrate  140 , and a lower polarizer  165   b  with a lower protective film  167   b  attached thereon is attached on the bottom of the TFT array substrate  101 . 
     Next, Ag paste for forming an Ag dot is prepared. The Ag paste contains Ag particles, glass frit, and a solvent. The Ag particles serve to provide the conductivity of the Ag dot, and the glass frits serve to provide adhesiveness between the Ag dot and the substrates. The glass frit may be leaded or unleaded glass frit, for example, lead oxide PbO, bismuth oxide Bi2O3, silicon oxide SiO2, boron oxide B2O3, aluminum oxide Al2O3, zinc oxide ZnO, and cerium oxide CeO2. 
     The solvent serves to liquefy the Ag particles and the glass frit so that they are easily mixed together and applied. The solve may comprise, for example, ethyl carbitol, butyl carbitol, ethyl carbitol acetate, butyl carbitol acetate, texanol, terpine oil, dipropyleneglycol methylether, dipropyleneglycol ethylether, dipropyleneglycol monomethylether, dipropyleneglycol monomethylether acetate, cellosolve acetate, butylcellosolve acetate, tripropylene glycol, etc. 
     The Ag paste prepared from the Ag particles, the glass frit, and the solvent are applied to the liquid crystal panel LP by a method such as dispensing or spraying to thus form the Ag dot  170 . More specifically, the Ag paste is applied to the area of the liquid crystal panel LP that exposes the entire edges of the upper polarizer  165   a , color filter substrate  140 , and TFT array substrate  101  to thus form the Ag dot  170 . Accordingly, the Ag dot  170  is in continuous contact with the upper protective film  167   a,  a side of the upper polarizer  165   a,  the rear ITO  160 , a side of the color filter substrate  140 , and the TFT array substrate  101 . 
     Next, referring to  FIG. 5   b , the upper protective film  167   a  of the upper polarizer  165   a  and the lower protective film  167   b  of the lower polarizer  165   b  are removed. At this point, part E of the Ag dot  170  covering the top part of the upper protective film  167   a  is removed simultaneously with the removal of the upper protective film  167   a.  That is, part of the Ag dot  170  shown in dotted line is removed simultaneously with the removal of the upper protective film  167   a.    
     Accordingly, the Ag dot  170  does not exist on the top surface of the upper polarizer  165   a,  and is formed to have a structure covering only a side of the upper polarizer  165   a.  The Ag dot  170  formed in this structure can prevent static electricity by connecting the rear ITO  160  of the color filter substrate  140  and the ground of the TFT array substrate  101 . 
     Next, referring to  FIG. 5   c , the OCA film  185  is attached onto the cover substrate  180 , and then the liquid crystal panel LP and the cover substrate  180  are bonded together by a laminating process, thereby manufacturing the in-plane switching mode liquid crystal display according to the first exemplary embodiment of the present invention. 
     As described above, the method for manufacturing the in-plane switching mode liquid crystal display according to the first exemplary embodiment of the present invention prevents the Ag dot from being formed in the bonded area of the cover substrate through the process of removing the protective films attached on the polarizers, and adjusts the size of the Ag dot. Accordingly, it has the advantage that the yield of the bonding process of the cover substrate and the liquid crystal panel and the Ag dot process can be improved. 
     Meanwhile, the in-plane switching mode liquid crystal display according to the first exemplary embodiment of the present invention may further comprise a touch panel. 
       FIGS. 6   a  to  6   c  are views showing in steps a method for manufacturing an in-plane switching mode liquid crystal display comprising a touch panel according to the first exemplary embodiment of the present invention. In the following, only the components of the touch panel are added to the description of  FIGS. 4 to 5   c . Like parts are denoted by like reference numerals, so a description thereof will be omitted. 
     Referring to  FIG. 6   a , the TFT array substrate  101  and the color filter substrate  140  with the rear ITO  160  are bonded together, and the driving IC  155  is bonded, thereby manufacturing the liquid crystal panel LP. The touch panel  190  is attached on the liquid crystal panel LP, and an upper polarizer  165   a  with an upper protective film  167   a  attached thereon is attached on top of the touch panel  190 , and a lower polarizer  167   b  with a lower protective film  167   b  attached thereon is attached on the bottom of the TFT array substrate  101 . 
     The Ag paste is applied to the liquid crystal panel LP by a method such as dispensing or spraying to thus form the Ag dot  170 . More specifically, the Ag paste is applied to the area of the liquid crystal panel LP that exposes the entire edges of the upper polarizer  165   a,  touch panel  190 , color filter substrate  140 , and TFT array substrate  101  to thus form the Ag dot  170 . Accordingly, the Ag dot  170  is in continuous contact with the upper protective film  167   a,  a side of the upper polarizer  165   a,  the touch panel  190 , the rear ITO  160 , a side of the color filter substrate  140 , and the TFT array substrate  101 . 
     Next, referring to  FIG. 6   b , the upper protective film  167   a  of the upper polarizer  165   a  and the lower protective film  167   b  of the lower polarizer  165   b  are removed. At this point, part E of the Ag dot  170  covering the top part of the upper protective film  167   a  is removed simultaneously with the removal of the upper protective film  167   a.  That is, part of the Ag dot  170  shown in dotted line is removed simultaneously with the removal of the upper protective film  167   a.    
     Accordingly, the Ag dot  170  does not exist on the top surface of the upper polarizer  165   a,  and is formed to have a structure covering only a side of the upper polarizer  165   a.  The Ag dot  170  formed in this structure can prevent static electricity by connecting the rear ITO  160  of the color filter substrate  140  and the ground of the TFT array substrate  101 . 
     Next, referring to  FIG. 6   c , the OCA film  185  is attached onto the cover substrate  180 , and then the liquid crystal panel LP and the cover substrate  180  are bonded together by a laminating process, thereby manufacturing the in-plane switching mode liquid crystal display comprising the touch panel according to the first exemplary embodiment of the present invention. 
     As described above, the method for manufacturing the in-plane switching mode liquid crystal display comprising the touch panel according to the first exemplary embodiment of the present invention prevents the Ag dot from being formed in the bonded area of the cover substrate through the process of removing the protective films attached on the polarizers, and adjusts the size of the Ag dot. Accordingly, it has the advantage that the yield of the bonding process of the cover substrate and the liquid crystal panel and the Ag dot process can be improved. 
       FIG. 7  is a view showing an in-plane switching mode liquid crystal display according to a second exemplary embodiment of the present invention, and  FIGS. 8   a  to  8   d  are view showing in steps a method for manufacturing an in-plane switching mode liquid crystal display according to a second exemplary embodiment of the present invention. 
     Referring to  FIG. 7 , in the in-plane switching mode liquid crystal display  200  of the present invention, a liquid crystal panel LP formed by bonding the TFT array substrate  201  and the color filter substrate  240  is disposed, with a liquid crystal layer (not shown) interposed therebetween, the rear ITO  260  and an upper polarizer  265   a  are disposed on the color filter substrate  240 , and a lower polarizer  265   b  is disposed under the TFT array substrate  201 . 
     An Ag dot  270  connecting the rear ITO  260  of the color filter substrate  240  and the ground of the TFT array substrate  201  is disposed on an edge of the liquid crystal panel LP, i.e., an edge of the TFT array substrate  201  and the color filter substrate  240 . The cover substrate  280  is attached and disposed on the liquid crystal panel LP through an OCA film  285 . 
     Meanwhile, in the second exemplary embodiment of the present invention, unlike the first exemplary embodiment of the present invention, the Ag dot  270  is disposed on part of the edge of the upper polarizer  265   a.    
     Referring to  FIG. 8   a , the method for manufacturing the in-plane switching mode liquid crystal display of  FIG. 7  will be described. A thin film transistor, a common electrode, and a pixel electrode are formed on a substrate, thereby preparing a TFT array substrate  201 , and a black matrix, color filters, an overcoat layer, and rear ITO are formed on another substrate, thereby preparing a color filter substrate  240 . 
     Next, the TFT array substrate  201  and the color filter substrate  240  are bonded together, and liquid crystal is injected therein to prepare a liquid crystal panel LP. After that, a driving IC  255  is bonded to the edge of the TFT array substrate  201  of the liquid crystal panel PL. Then, an upper polarizer  265   a  with an upper protective film  267   a  attached thereon is attached on top of the color filter substrate  240 , and a lower polarizer  265   b  with a lower protective film  267   b  attached thereon is attached on the bottom of the TFT array substrate  201 . 
     Here, the upper protective film  267   a  has a cut-out open portion OP. That is, as shown in  FIG. 8   b , an edge portion of the upper protective film  267   a  is cut out to provide the open portion OP which exposes the upper polarizer  265   a.    
     Then, the Ag paste prepared from the Ag particles, the glass frit, and the solvent are applied to the liquid crystal panel LP by a method such as dispensing or spraying to thus form the Ag dot  270 . More specifically, the Ag paste is applied to the area exposing the entire edges of the upper protective film  267   a,  upper polarizer  265   a,  color filter substrate  240 , and TFT array substrate  201  to thus form the Ag dot  270 . Accordingly, the Ag dot  270  is in continuous contact with the upper protective film  267   a,  the upper polarizer  265   a,  the rear ITO  260 , a side of the color filter substrate  240 , and the TFT array substrate  201 . 
     Next, referring to  FIG. 8   c , the upper protective film  267   a  of the upper polarizer  265   a  and the lower protective film  267   b  of the lower polarizer  265   b  are removed. At this point, part E of the Ag dot  270  covering the top part of the upper protective film  267   a  is removed simultaneously with the removal of the upper protective film  267   a.  That is, part of the Ag dot  270  shown in dotted line is removed simultaneously with the removal of the upper protective film  267   a.    
     Accordingly, the Ag dot  270  is formed to have a structure covering the top surface and side of the upper polarizer  165   a.  The Ag dot  270  formed in this structure can prevent static electricity by connecting the rear ITO  260  of the color filter substrate  240  and the ground of the TFT array substrate  201 . 
     Next, referring to  FIG. 8   d , the OCA film  285  is attached onto the cover substrate  280 , and then the liquid crystal panel LP and the cover substrate  280  are bonded together by a laminating process, thereby manufacturing the in-plane switching mode liquid crystal display according to the second exemplary embodiment of the present invention. 
     As described above, the method for manufacturing the in-plane switching mode liquid crystal display according to the second exemplary embodiment of the present invention prevents the Ag dot from being formed in the bonded area of the cover substrate through the process of removing the protective films attached on the polarizers, and adjusts the size of the Ag dot. Accordingly, it has the advantage that the yield of the bonding process of the cover substrate and the liquid crystal panel and the Ag dot process can be improved. 
     Meanwhile, the in-plane switching mode liquid crystal display according to the second exemplary embodiment of the present invention may further comprise a touch panel. 
       FIGS. 9   a  to  9   c  are views showing in steps a method for manufacturing an in-plane switching mode liquid crystal display comprising a touch panel according to the second exemplary embodiment of the present invention. In the following, only the components of the touch panel are added to the description of  FIGS. 7 to 8   d . Like parts are denoted by like reference numerals, so a description thereof will be omitted. 
     Referring to  FIG. 9   a , the TFT array substrate  201  and the color filter substrate  240  with the rear ITO  260  are bonded together, and the driving IC  255  is bonded, thereby manufacturing the liquid crystal panel LP. The touch panel  290  is attached on the liquid crystal panel LP, and an upper polarizer  265   a  with an upper protective film  267   a  attached thereon is attached on top of the touch panel  290 , and a lower polarizer  267   b  with a lower protective film  267   b  attached thereon is attached on the bottom of the TFT array substrate  201 . An open portion OP is formed on the upper protective film  267   a.    
     Then, the Ag paste is applied to the liquid crystal panel LP by a method such as dispensing or spraying to thus form the Ag dot  270 . More specifically, the Ag paste is applied to the area of the liquid crystal panel LP that exposes the entire edges of the upper protective film  267   a,  upper polarizer  265   a,  touch panel  290 , color filter substrate  240 , and TFT array substrate  201  to thus form the Ag dot  270 . Accordingly, the Ag dot  270  is in continuous contact with the upper protective film  267   a,  a top surface and side of the upper polarizer  265   a,  the touch panel  290 , the rear ITO  260 , a side of the color filter substrate  240 , and the TFT array substrate  201 . 
     Next, referring to  FIG. 9   b , the upper protective film  267   a  of the upper polarizer  265   a  and the lower protective film  267   b  of the lower polarizer  265   b  are removed. At this point, part E of the Ag dot  270  covering the top part of the upper protective film  267   a  is removed simultaneously with the removal of the upper protective film  267   a.  That is, part of the Ag dot  270  shown in dotted line is removed simultaneously with the removal of the upper protective film  267   a.  And, part of the Ag dot  270  positioned in the open portion OP of the upper protective film  267   a  is left on the upper polarizer  265   a  as it is. 
     Accordingly, the Ag dot  270  is formed to have a structure covering the top surface and side of the upper polarizer  265   a.  The Ag dot  270  formed in this structure can prevent static electricity by connecting the rear ITO  260  of the color filter substrate  240  and the ground of the TFT array substrate  201 . 
     Next, referring to  FIG. 9   c , the OCA film  285  is attached onto the cover substrate  280 , and then the liquid crystal panel LP and the cover substrate  280  are bonded together by a laminating process, thereby manufacturing the in-plane switching mode liquid crystal display comprising the touch panel. 
     As described above, the method for manufacturing the in-plane switching mode liquid crystal display comprising the touch panel according to the second exemplary embodiment of the present invention prevents the Ag dot from being formed in the bonded area of the cover substrate through the process of removing the protective films attached on the polarizers, and adjusts the size of the Ag dot. Accordingly, it has the advantage that the yield of the bonding process of the cover substrate and the liquid crystal panel and the Ag dot process can be improved. 
       FIG. 10  is a view showing the in-plane switching mode liquid crystal display manufactured according to the first exemplary embodiment of the present invention,  FIG. 11   a  is a view showing a liquid crystal display having an Ag dot applied thereto,  FIG. 11   b  is a view showing a liquid crystal display having a protective film removed therefrom, and  FIG. 11   c  is a view showing the removed protective film. 
     Referring to  FIG. 10 , a plurality of Ag dots are applied to the edge of the liquid crystal panel manufactured according to the first exemplary embodiment of the present invention. 
     In more detail, it can be seen from  FIG. 11   a  that the Ag dots are continuously applied between the TFT array substrate and the protective film, and it can be seen from  FIG. 11   b  that, after the protective film is removed, part of the Ag dot on the protective film is removed and thus is not left on the polarizer. And, it can be seen from  FIG. 11   c  that part of the Ag dot is left on the removed protective film. That is, it can be seen that part of the Ag dot is removed simultaneously with the removal of the protective film. 
     Moreover, a resistance between the TFT array substrate {circle around ( 1 )} and the color filter substrate {circle around ( 2 )} is found to be about 0.9Ω in  FIG. 11   a  which illustrates a state where the protective film is not removed, while a resistance between the TFT array substrate {circle around ( 1 )} and the color filter substrate {circle around ( 2 )} is found to be about 0.8Ω in  FIG. 11   b  which illustrates a state where the protective film is removed. So, there is little difference in resistance. 
     As described above, the method for manufacturing the in-plane switching mode liquid crystal display according to the present invention can prevent the Ag dot from being formed in the bonded area of the cover substrate through the process of removing the protective films attached on the polarizers, and adjust the size of the Ag dot. Accordingly, it has the advantage that the yield of the bonding process of the cover substrate and the liquid crystal panel and the Ag dot process can be improved. 
     The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present invention. The present teaching can be readily applied to other types of apparatuses. The description of the foregoing embodiments is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Moreover, unless the term “means” is explicitly recited in a limitation of the claims, such limitation is not intended to be interpreted under 35 USC 112(6).