Patent Publication Number: US-11656709-B2

Title: Display device and method of manufacturing the same

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 17/077,861, filed on Oct. 22, 2020, which is a continuation of U.S. patent application Ser. No. 16/177,205, filed on Oct. 31, 2018, now U.S. Pat. No. 10,854,843 issued on Dec. 1, 2020, which claims the benefit of the Korean Patent Application No. 10-2017-0143997 filed on Oct. 31, 2017, all of which are hereby incorporated by reference in their entirety as if fully set forth herein. 
    
    
     BACKGROUND 
     Field of the Disclosure 
     The present disclosure relates to a display device and a method of manufacturing the same. 
     Description of the Background 
     With the advancement of the information age, a demand for a display device for displaying an image has been increased in various forms. Therefore, various display devices such as liquid crystal display (LCD) devices, plasma display panel (PDP) devices, and organic light emitting display (OLED) devices have been used. 
     Among the display devices, the organic light emitting display device is a self-light emitting device, and has advantages in that a viewing angle and a contrast ratio are more excellent than those of the liquid crystal display (LCD) device. Also, since the organic light emitting display device does not require a separate backlight, it is advantageous that the organic light emitting display device is able to be thin and lightweight and has low power consumption. Furthermore, the organic light emitting display device has advantages in that it may be driven at a low direct current voltage, has a fast response speed, and especially has a low manufacturing cost. 
     However, the organic light emitting display device includes pixels, each of which includes an organic light emitting diode, and has a disadvantage in that the organic light emitting diode may be easily degraded by external factors such as external water and oxygen. In order to prevent this, the organic light emitting display device forms an encapsulation film to prevent external water and oxygen from being permeated into the organic light emitting diode. 
     The encapsulation film includes at least one inorganic film and at least one organic film to prevent oxygen or water from being permeated into an organic light emitting layer and an electrode. At this time, at least one organic film generally includes a polymer, and is formed by a hardening process after being doped on a substrate in a liquid type. Since such an organic film has flexibility until the hardening process is performed, a problem may occur in that the organic film may overflow outside an area where the encapsulation film is to be formed. For example, the organic film may overflow toward a pad area where a plurality of pads is provided. To solve this problem, a dam for blocking a flow of the organic film is formed along the outside of the organic light emitting diode. 
     Also, to protect the organic light emitting diode from oxygen or water, at least one inorganic film is entirely formed on the organic light emitting diode except for a pad area where a pad electrode is arranged. In the manufacturing method of the related art, to expose the pad electrode, a mask for covering the pad electrode is arranged on the pad electrode, and then the inorganic film is formed. The mask is arranged to be close to the pad electrode such that the inorganic film is not formed in the pad area. At this time, arcing may occur between a boundary surface of the mask for covering the pad area and the pad electrode. If arcing occurs between the mask and the pad electrode, a high current entering the pad electrode from the mask may flow into the display device along the pad electrode, whereby a defect may occur. 
     SUMMARY 
     The present disclosure has been made in view of the above problems, and the present disclosure is to provide a display device and a method of manufacturing the same. 
     In addition, the present disclosure is to provide a display device and a method of manufacturing the same in which arcing may be prevented from occurring. 
     In accordance with an aspect of the present disclosure, the above and other objects can be accomplished by the provision of a display device and a method of manufacturing the same, the display device comprising a first substrate including a display area on which pixels are arranged, and a non-display area surrounding the display area; a dam surrounding the display area, arranged on the non-display area; a pad electrode arranged outside the dam; and an encapsulation film covering the display area and including a first inorganic film and a second inorganic film arranged on the first inorganic film, wherein the second inorganic film is overlapped with the pad electrode. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a perspective view illustrating a display device according to one embodiment of the present disclosure; 
         FIG.  2    is a block view illustrating a display device according to one embodiment of the present disclosure; 
         FIG.  3    is a cross-sectional view briefly illustrating one side of a display panel in  FIG.  1   ; 
         FIG.  4    is a plane view briefly illustrating a first substrate according to one embodiment of the present disclosure; 
         FIG.  5    is a plane view illustrating a touch sensing layer arranged on the first substrate; 
         FIG.  6    is a cross-sectional view illustrating an example taken along line I-I′ of  FIG.  5   ; 
         FIG.  7    is a flow chart illustrating a method of manufacturing a display device according to one embodiment of the present disclosure; 
         FIGS.  8 A to  8 F  are cross-sectional views illustrating a method of manufacturing a display device according to one embodiment of the present disclosure; and 
         FIGS.  9 A to  9 D  are cross-sectional views illustrating a method of manufacturing a display device according to another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Terms disclosed in this specification should be understood as follows. 
     The term of a singular expression should be understood to include a multiple expression as well as the singular expression if there is no specific definition in the context. The terms such as “the first” and “the second” are used only to differentiate one element from other elements. Thus, a scope of claims is not limited by these terms. Also, it should be understood that the term such as “include” or “have” does not preclude existence or possibility of one or more features, numbers, steps, operations, elements, parts or their combinations. It should be understood that the term “at least one” includes all combinations related with any one item. For example, “at least one among a first element, a second element and a third element” may include all combinations of two or more elements selected from the first, second and third elements as well as each element of the first, second and third elements. Also, if it is mentioned that a first element is positioned “on or above” a second element, it should be understood that the first and second elements may be brought into contact with each other, or a third element may be interposed between the first and second elements. 
     Hereinafter, a display device and a method of manufacturing the same according to the preferred embodiment of the present disclosure will be described with reference to the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Also, in the following description of the present disclosure, if detailed description of elements or functions known in respect of the present disclosure is determined to make the subject matter of the present disclosure unnecessarily obscure, the detailed description will be omitted. 
     Hereinafter, the preferred embodiment of the present disclosure will be described with reference to the accompanying drawings. 
       FIG.  1    is a perspective view illustrating a display device according to one embodiment of the present disclosure.  FIG.  2    is a block view illustrating a display device according to one embodiment of the present disclosure. 
     Referring to  FIGS.  1  and  2   , the display device according to the embodiment of the present disclosure includes a display panel  110 , a scan driver  120 , a data driver  130 , a timing controller  160 , a host system  170 , a touch driver  180 , and a touch coordinate calculator  190 . 
     The display device with a built-in touch screen according to the embodiment of the present disclosure may be realized as a flat panel display device such as a Liquid Crystal Display (LCD), Field Emission Display (FED), Plasma Display Panel (PDP), Organic Light Emitting Display (OLED), and Electrophoresis display (EPD). Hereinafter, the display device with a built-in touch screen according to the embodiment of the present disclosure is realized as, but not limited to, an organic light emitting display device. 
     The display panel  110  includes a display area on which pixels P are arranged to display an image. On the display area  110 , data lines DL 1  to DLm (m is a positive integer of 2 or more) and scan lines S 1  to Sn (n is a positive integer of 2 or more) are provided. The data lines DL 1  to DLm may be formed to cross the scan lines S 1  to Sn. The pixels P may be formed on the area defined by a crossed structure of the gate lines and data lines. 
     Each of the pixels P of the display panel  110  may be connected to any one of the data lines DL 1  to DLm and any one of the scan lines S 1  to Sn. Each of the pixels P of the display panel  110  may include a driving transistor for controlling a drain-source current in accordance with a data voltage applied to a gate electrode, a scan transistor turned on by a scan signal of the scan line, supplying a data voltage of the data line to the gate electrode of the driving transistor, an organic light emitting diode for emitting light in accordance with the drain-source current of the driving transistor, and a capacitor for storing a voltage of the gate electrode of the driving transistor. Therefore, each of the pixels P may emit light in accordance with the current supplied to the organic light emitting diode. 
     The scan driver  120  receives a scan control signal GCS from the timing controller  160 . The scan driver  120  supplies scan signals to the scan lines S 1 ˜Sn in accordance with the scan control signal GCS. 
     The scan driver  120  may be formed in a non-display area outside one side or both sides of a display area of the display panel  110  in a GIP (gate driver in panel) mode. Alternatively, the scan driver  120  is fabricated of a driving chip, packaged in a flexible film, and may be attached to the non-display area outside one side or both sides of the display area of the display panel  110  in a TAB (tape automated bonding) mode. 
     The data driver  130  receives digital video data DATA and a data control signal DCS from the timing controller  160 . The data driver  130  converts the digital video data DATA into an analogue positive polarity/negative polarity data voltage in accordance with the data control signal DCS and supplies them to the data lines. That is, pixels to which the data voltages will be supplied are selected by the scan signals of the scan driver  120 , and the data voltages are supplied to the selected pixels. 
     The data driver  130  may include a plurality of source drive ICs. Each of the plurality of source drive ICs may be packaged into the flexible film  140  in a COF (chip on film) or COP (chip on plastic) mode. The flexible film  140  is attached onto pads provided on the non-display area of the display panel  110  using an anisotropic conducting film, whereby the source drive ICs may be connected to the pads. 
     The circuit board  150  may be attached to the flexible films  140 . A plurality of circuits realized as driving chips may be packaged onto the circuit board  150 . For example, the timing controller  160  may be packaged onto the circuit board  150 . The circuit board  150  may be a printed circuit board or flexible printed circuit board. 
     The timing controller  160  receives digital video data DATA and timing signals from the host system  170 . The timing signals may include a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a dot clock. The vertical synchronization signal is a signal defining one frame period. The horizontal synchronization signal is a signal defining one horizontal period needed to supply the data voltages to pixels of one horizontal line of the display panel DIS. The data enable signal is a signal for defining a period of inputting available data. The dot clock is a signal repeated with a predetermined short period. 
     In order to control operation timings of the scan driver  120  and the data driver  130 , the timing controller  160  generates a data control signal DCS to control operation timing of the data driver  130  and a scan control signal GCS for controlling operation timing of the data driver  130  based on the timing signals. The timing controller  160  outputs the scan control signal GCS to the scan driver  120  and outputs the digital video data DATA and the data control signal DCS to the data driver  130 . 
     The host system  170  may be realized as a navigation system, a set-top box, a DVD player, a blue-ray player, a personal computer (PC), a home theater system, a broadcasting receiver, and a phone system. The host system  170  includes SOC (i.e., system on chip) equipped with a scaler and converts the digital video data DATA of an input image to a format suitable to display the display panel  110 . The host system  170  transmits the digital video data DATA and the timing signals to the timing controller  160 . 
     On the display panel  110 , not only the data lines DL 1  to DLm and the scan lines S 1  to Sn but also first and the second touch electrodes may be formed. The first touch electrodes may be formed to cross the second touch electrodes. The first touch electrodes may be connected to a first touch driver  181  through first touch lines T 1  to Tj, where j is an integer equal to or greater than 2. The second touch electrodes may be connected to a second touch driver  182  through second touch lines R 1  to Ri, where i is an integer equal to or greater than 2. On each of the intersections between the first touch electrodes and the second touch electrodes, a touch sensor may be formed. The touch sensor according to the embodiment of the present disclosure is realized as, but not limited to, a mutual capacitance. The first and the second touch electrodes will be described later in more detail with reference to  FIG.  4   . 
     The touch driver  180  supplies a driving pulse to the first touch electrodes through the first touch lines T 1  to Tj and senses the amount of charge changes in each of the touch sensors through the second touch lines R 1  to Ri. That is, in  FIG.  2   , description will be given based on that the first touch lines T 1  to Tj are Tx lines for supplying a driving pulse and the second touch lines R 1  to Ri are Rx lines for sensing the amount of charge changes in in each of the touch sensors. 
     The touch driver  180  includes the first touch driver  181 , the second touch driver  182 , and the touch controller  183 . The first touch driver  181 , the second touch driver  182 , and the touch controller  183  may be integrated into one ROIC (i.e., read-out IC). 
     The first touch driver  181  selects the first touch line to output a driving pulse under the control of the touch controller  183  and supplies the driving pulse to the selected first touch line. For example, the first touch driver  181  may sequentially supply driving pulses to the first touch lines T 1  to Tj. 
     The second touch driver  182  selects the second touch lines to receive the amount of charge changes in the touch sensors under the control of the touch controller  183  and receives the amount of charge changes in the touch sensors through the selected second touch lines. The second touch driver  182  converts the amount of charge changes in the touch sensors, which are received through the second touch lines R 1  to Ri, to touch raw data TRD corresponding to digital data, by sampling the amount of charge changes in the touch sensors. 
     The touch controller  183  may generate a Tx setup signal in the first touch driver  181  to set up the first touch line to which the driving pulse is to be output and an Rx setup signal in the second touch line to set up the second touch line in which a touch sensor voltage is to be received. Also, the touch controller  183  generates timing control signals to control operation timings of the first touch driver  181  and the second touch driver  182 . 
     The touch coordinate calculator  190  receives touch raw data TRD from the touch driver  180 . The touch coordinate calculator  190  calculates touch coordinates in accordance with a touch coordinate calculating method and outputs touch coordinate data HIDxy including information of touch coordinates to the host system  170 . 
     The touch coordinate calculator  190  may be realized as a Micro Controller Unit (MCU). The host system  170  analyzes touch coordinate data HIDxy input from the touch coordinate calculator  190  and executes an application program connected with a coordinate where a touch is generated by a user. The host system  170  transmits the digital video data DATA and the timing signals to the timing controller  160  in accordance with the executed application program. 
     The touch driver  180  may be included in the source drive ICs  131  or may be fabricated of a separate drive chip and packaged onto the circuit board  150 . Also, the touch coordinate calculator  190  may be fabricated of a driving chip and packaged onto the circuit board  150   FIG.  3    is a cross-sectional view briefly illustrating one side of a display panel in  FIG.  1   . 
     Referring to  FIG.  3   , the display panel  110  may include a first substrate  111 , a second substrate  112 , a thin film transistor layer  10  arranged between the first and second substrates  111  and  112 , an organic light emitting diode layer  20 , an encapsulation layer  30 , and a touch sensing layer  40 . 
     The first substrate  111  may be a plastic film or a glass substrate. 
     The thin film transistor layer  10  is formed on the first substrate  111 . The thin film transistor layer  10  may include scan lines, data lines, and thin film transistors. Each of the thin film transistors includes a gate electrode, a semiconductor layer, source and drain electrodes. In the case that a scan driver is formed using a GIP (gate driver in panel) method, the scan driver may be formed together with the thin film transistor layer  10 . 
     The organic light emitting diode layer  20  is formed on the thin film transistor  10 . The organic light emitting diode layer  20  includes first electrodes, an organic light emitting layer, a second electrode, and banks. Each of the organic light emitting layers may include a hole transporting layer, an organic light emitting layer, and an electron transporting layer. In this case, when a voltage is applied to the first electrode and the second electrode, holes and electrons are moved to the light emitting layer through the hole transporting layer and the electron transporting layer, respectively and are combined in the organic light emitting layer, thereby emitting light. Since pixels P are arranged on the area where the organic light emitting diode layer  20  is arranged, the area where the organic light emitting diode layer  20  is arranged may be defined as the display area. An area in the periphery of the display area may be defined as the non-display area. 
     The encapsulation layer  30  is formed on the organic light emitting diode layer  20 . The encapsulation layer  30  serves to prevent oxygen and water from being permeated into the organic light emitting diode layer  20 . The encapsulation layer  30  may include at least one inorganic film. 
     The touch sensing layer  40  is formed on the encapsulation layer  30 . The touch sensing layer  40  includes first and the second touch electrodes for sensing a touch of a user, and may include bridge electrodes for electrically connecting the first touch electrodes or the second touch electrodes. It may also be said that the touch line of the touch sensing layer is disposed on a side surface of the encapsulation layer. It may also be said that “side surface” refers to an upright or sloping surface portion of a layer in a direction substantially perpendicular to, or at a non-zero angle with respect to, the top and bottom surfaces of a layer. 
     Hereafter, the encapsulation layer  30  and the touch sensing layer  40  according to the first embodiment of the present disclosure will be described in more detail with reference to  FIGS.  4  to  9   . 
       FIG.  4    is a plane view briefly illustrating a first substrate according to one embodiment of the present disclosure,  FIG.  5    is a plane view illustrating a touch sensing layer arranged on the first substrate,  FIG.  6    is a cross-sectional view illustrating a display device according to one embodiment of the present disclosure, illustrating an example taken along line I-I′ of  FIG.  5   . 
     Referring to  FIGS.  4  to  6   , the first substrate  111  is categorized into a display area DA and a non-display area NDA, wherein pixels P are arranged on the display area DA. The non-display area NDA surrounds the display area DA, and is provided with a dam DAM, and is also provided with a pad area PA where a bending area BA and pad electrodes PAD are formed outside the dam DAM. It may be said that a DAM is a barrier structure for preventing a material, such as the organic film layer, from flowing or spreading. 
     The thin film transistor layer  10  and the organic light emitting diode layer  20  are formed on the first substrate  111 . 
     The thin film transistor layer  10  includes thin film transistors  210 , a gate insulating film  220 , an inter-layer dielectric film  230 , and a planarization film  241 . 
     A buffer film may be arranged on one surface of the first substrate  111 . The buffer film may be formed on one surface of the first substrate  111  to protect the thin film transistors  210  and light emitting diodes  260  from water permeated through the first substrate  111  which is vulnerable to moisture permeability. One surface of the first substrate  111  may be a surface facing the second substrate  112 . The buffer film may be made of a plurality of inorganic films which are deposited alternately. For example, the buffer film may be formed of a multi-layered film of one or more inorganic films of a silicon oxide film (SiOx), a silicon nitride film (SiNx) and SiON, which are deposited alternately. The buffer film may be omitted. 
     The thin film transistor  210  is arranged on the buffer film. The thin film transistor  210  includes an active layer  211 , a gate electrode  212 , a source electrode  213 , and a drain electrode  214 . Although the thin film transistor  210  is formed in a top gate mode in which the gate electrode  212  is arranged above the active layer  211  as shown in  FIG.  6   , it is to be understood that the thin film transistor of the present disclosure is not limited to the top gate mode. That is, the thin film transistor  210  may be formed in a bottom gate mode in which the gate electrode  212  is arranged below the active layer  211  or a double gate mode in which the gate electrode  212  is arranged above and below the active layer  211 . 
     The active layer  211  is arranged on the first substrate  111 . The active layer  211  may be formed of a silicon based semiconductor material or an oxide based semiconductor material. A light-shielding layer for shielding external light entering the active layer  211  may be formed between the first substrate  111  and the active layer  211 . 
     The gate insulating film  220  may be arranged on the active layer  211 . The gate insulating film  220  may be formed of an inorganic film, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx) or a multi-layered film of the silicon oxide film and the silicon nitride film. 
     The gate electrode  212  and the first connection line  215  may be arranged on the gate insulating film  220 . The first connection line  215  is arranged to be spaced apart from the gate electrode  212  on the non-display area NDA. The gate electrode  212  and the first connection line  215  may be formed of a single layer or multi-layer comprised of any one of Mo, Al, Cr, Au, Ti, Ni, Nd and Cu or their alloy. 
     The inter-layer dielectric film  230  may be arranged on the gate electrode  212  and the first connection line  215 . The inter-layer dielectric film  230  may be formed of an inorganic film, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multi-layered film of the silicon oxide film and the silicon nitride film. 
     The source electrode  213 , the drain electrode  214 , a second connection line  216  and a third connection line  217  may be arranged on the inter-layer dielectric film  230 . Each of the source electrode  213  and the drain electrode  214  may be connected to the active layer  211  through a contact hole that passes through the gate insulating film  220  and the inter-layer dielectric film  230 . Also, the second connection line  216  and the third connection line  217  are arranged on the non-display area NDA, and may be connected to the first connection line  215  through a contact hole that passes through the inter-layer dielectric film  230 . The source electrode  213 , the drain electrode  214 , the second connection line  216  and the third connection line  217  may be formed of a single layer or multi-layer comprised of any one of Mo, Al, Cr, Au, Ti, Ni, Nd and Cu or their alloy. 
     A passivation film may be formed on the source electrode  213  and the drain electrode  214  to insulate the thin film transistor  210 . The passivation film may be formed of an inorganic film, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multi-layered film of the silicon oxide film and the silicon nitride film. This passivation film may be omitted. 
     The planarization film  241  for planarizing a step difference due to the thin film transistor  210  may be arranged on the source electrode  213  and the drain electrode  214 . Also, an organic pattern  242  and a line protective film  243  are arranged on the third connection line  217 . It may be said that the organic pattern is bendable within the bending area. Further, the organic pattern may alternatively be a bending film. 
     The organic pattern  242  is arranged between the dam DAM and the pad electrode PAD, and may be arranged to partially an upper portion of the third connection line  217 . The organic pattern  242  prevents the third connection line  217  in the bending area BA where the first substrate  111  is bent from being externally exposed and serves to protect the third connection line  217 . Also, the organic pattern  242  is provided with an open hole OH of which upper portion is exposed. That is, organic films, which may be arranged on the organic pattern  242 , for example, the first inorganic film  310 , the second inorganic film  330  and the insulating film  410  are removed. If the inorganic film is arranged on the organic pattern  242 , a crack may be generated in the inorganic film when the bending area BA is bent. Since water may be permeated into the inorganic film where a crack is generated, the inorganic films provided on the organic pattern  242  are removed. 
     The line protective film  243  is arranged to surround an end of the third connection line  217 . The line protective film  243  protects the end of the third connection line  217  arranged at an edge of the non-display area NDA. 
     The organic pattern  242  and the line protective film  243  are arranged on the same layer as the planarization film  241 , and may be made of the same material. The planarization film  241 , the organic pattern  242  and the line protective film  243  may be formed of an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin. 
     The organic light emitting diode layer  20  is arranged on the thin film transistor layer  10 . The organic light emitting diode layer  20  includes an organic light emitting diode  250  and a bank  260 . 
     The organic light emitting diode  250  and the bank  260  are arranged on the planarization film  241 . The organic light emitting diode  250  includes the first electrode  251 , the organic light emitting layer  252 , and the second electrode  253 . The first electrode  251  may be an anode electrode, and the second electrode  253  may be a cathode electrode. 
     The first electrode  251  may be formed on the planarization film  241 . The first electrode  251  may be connected to the source electrode  213  of the thin film transistor  210  through a contact hole that passes through the passivation film and the planarization film  241 . The first electrode  251  may be formed of conductive material with high reflexibility such as a deposition structure (Ti/Al/Ti) of Al and Ti, a deposition structure (ITO/Al/ITO) of Al and ITO, an APC alloy, or a deposition structure (ITO/APC/ITO) of APC alloy and ITO. The APC alloy is an alloy of Ag, Pd and Cu. 
     In order to partition pixels P, the bank  260  may be arranged on the planarization film  241  to cover an edge of the first electrode  251 . That is, the bank  260  serves as a pixel defining film for defining pixels P. The bank  260  may be formed of an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin. 
     The organic light emitting layer  252  is arranged on the first electrode  251  and the bank  260 . The organic light emitting layer  252  may include a hole transporting layer, at least one light emitting layer, and an electron transporting layer. In this case, when a voltage is applied to the first electrode  251  and the second electrode  253 , holes and electrons are moved to the light emitting layer through the hole transporting layer and the electron transporting layer, respectively, and are combined in the organic light emitting layer to emit light. 
     The organic light emitting layer  252  may be formed of a white light emitting layer for emitting white light. In this case, the organic light emitting layer  252  may be arranged to cover the first electrode  251  and the bank  260 . In this case, a color filter (not shown) may be formed on the second substrate  112 . 
     Otherwise, the organic light emitting layer  252  may be formed of a red light emitting layer for emitting red light, a green light emitting layer for emitting green light, and a blue light emitting layer for emitting blue light. In this case, the organic light emitting layer  252  may be arranged on the area corresponding to the first electrode  251  and a color filter may not be arranged on the second substrate  112 . 
     The second electrode  253  is arranged on the organic light emitting layer  252 . In the case that the organic light emitting display device is formed in a top emission structure, the second electrode  253  may be formed of a transparent conductive material (TCO) such as ITO and IZO, which may transmit light, or a semi-transmissive conductive material such as Mg, Ag, and alloy of Mg and Ag. A capping layer may be arranged on the second electrode  253 . 
     On the organic light emitting diode layer  20 , the encapsulation layer  30  is formed not only on the display area DA but also on the non-display area NDA. The encapsulation layer  30  includes a dam DAM and an encapsulation film  300 . 
     The dam DAM is arranged on the non-display area NDA and blocks a flow of an organic film  320  constituting the encapsulation film  300 . In more detail, the dam DAM is arranged to surround the outside of the display area DA and blocks a flow of the organic film  320  constituting the encapsulation film  300 . The dam DAM may also be arranged on the non-display area NDA to block the flow of the organic film  320 , thereby allowing the organic film  320  constituting the encapsulation film  300  not to be permeated into the pad electrode PAD. Therefore, the dam DAM may prevent the organic film  320  from being exposed to the outside of the display device or from being permeated into the pad electrode PAD. 
     Such a dam DAM may include a first dam D 1  and a second dam D 2 . 
     The first dam D 1  may be arranged to surround the outside of the display area DA to primarily block the flow of the organic film  320  constituting the encapsulation film  300 . Also, the first dam D 1  may be arranged between the display area DA and the pad area PA to primarily block the flow of the organic film  320  by preventing the organic film  320  from being permeated into the exposed pad area PA. 
     The second dam D 2  is arranged to surround the outside of the first dam D 1 , and is spaced apart from the first dam D 1  and arranged in parallel with the first dam D 1 . The second dam D 2  may secondarily block the flow of the organic film  320  toward the outside of the first dam D 1 . Therefore, the first dam D 1  and the second dam D 2  may more effectively prevent the organic film  320  from being exposed to the outside of the display device or from being permeated into the exposed pad area PA. It may also be said that the dams are arranged on a routing area, the routing area being between the touch electrodes and the pad and bending areas of the display. 
     Such a dam DAM may be formed simultaneously with the planarization film  241  or the bank  260  and formed of the same material as that of the planarization film  241  or the bank  260 . In this case, the dam DAM may be formed of an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin. 
     The encapsulation film  300  serves to prevent oxygen or water from being permeated into the organic light emitting layer  252  and the second electrode  253 . To this end, the encapsulation film  300  may include at least one inorganic film and at least one organic film. For example, the encapsulation film  300  may include a first inorganic film  310 , the organic film  320 , and a second inorganic film  330 . 
     The first inorganic film  310  is arranged on the second electrode  253 . The first inorganic film  310  is arranged to cover the second electrode  253 . The first inorganic film  310  according to one embodiment of the present disclosure covers the second electrode  253  and is extend to the non-display area NDA to cover the dam DAM. Also, the first inorganic film  310  according to one embodiment of the present disclosure is extended to the pad area PA arranged outside the dam DAM and overlapped with the pad electrode PAD. It may be said that elements that are “overlapped” refers to any element that extends over another element, but it also may refer generally to an element that is on a different layer to another element, and extends above or below said another element. For example, a first film underneath a second film may also be considered to overlap the second film. 
     In the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  is extended to the pad area PA, it is not required to arrange a mask for covering the pad area PA so as not to form the first inorganic film  310  on the pad area PA. Therefore, in the display device  100  according to one embodiment of the present disclosure, a mask is not arranged on the pad area PA to prevent arcing from being generated between a boundary surface of the mask and the pad electrode PAD arranged on the pad area PA or the metal line such as the third connection line  217  and prevent a defect from being generated due to a high current from the mask, which flows into the display device along the metal line. 
     The organic film  320  is arranged on the first inorganic film  310 . The organic film  320  may be formed with a sufficient thickness to prevent particles from being permeated into the organic light emitting layer  252  and the second electrode  253  by passing through the first inorganic film  310 . The organic film  320  may be formed by a hardening process after being deposited in a liquid type through an inkjet process. 
     The second inorganic film  330  is arranged on the organic film  320 . The second inorganic film  330  is arranged to cover the organic film  320 . The second inorganic film  330  according to one embodiment of the present disclosure covers the organic film  320  and may be extended to the non-display area NDA to cover the dam DAM. Also, the first inorganic film  310  according to one embodiment of the present disclosure is extended to the pad area PA arranged outside the dam DAM and overlapped with the pad electrode PAD. At this time, the first inorganic film  310  and the second inorganic film  330  according to one embodiment of the present disclosure may be formed to have their ends of the same position. It may also be said that an end of the first inorganic film and an end of the second inorganic film are in line with each other. It may also be said that film ends “in line with each other” refer to film ends that extend above or below each other and terminate at a similar point, one end not extending beyond the other. 
     In the display device  100  according to one embodiment of the present disclosure, since the second inorganic film  330  is extended to the pad area PA, it is not required to arrange a mask for covering the pad area PA so as not to form the second inorganic film  330  on the pad area PA. Therefore, in the display device  100  according to one embodiment of the present disclosure, a mask is not arranged on the pad area PA to prevent arcing from being generated between a boundary surface of the mask and the pad electrode PAD arranged on the pad area PA or the metal line such as the third connection line  217  and prevent a defect from being generated due to a high current from the mask, which flows into the display device along the metal line. 
     Also, in the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  is formed on the pad area PA, arcing is not generated between the boundary surface of the mask and the pad electrode PAD arranged on the pad area PA or the metal line such as the third connection line  217  even though the mask is arranged on the pad area PA. That is, the first inorganic film  310  may serve as an insulating film. In this way, in the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  formed to reach the pad area PA serves as an insulating film, arcing is not generated even though the mask is arranged on the pad area PA during a manufacturing process of the second inorganic film  330 . 
     Each of the first and second inorganic films  310  and  330  may be formed of a silicon nitride, an aluminum nitride, a zirconium nitride, a titanium nitride, a hafnium nitride, a tantalum nitride, a silicon oxide, an aluminum oxide, or a titanium oxide. The organic film  320  may be formed of acrylic resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin. 
     The touch sensing layer  40  is formed on the encapsulation layer  30 . The touch sensing layer  40  includes bridge electrodes BE, an insulating film  410 , first touch electrodes TE 1 , second touch electrodes TE 2 , a pad electrode PAD, and a passivation film  420 . 
     In the display device  100  according to one embodiment of the present disclosure, the bridge electrode BE is formed on the encapsulation film  300 , and no inorganic film is formed between the encapsulation film  300  and the bridge electrode BE. In the related art, a buffer layer is formed on the encapsulation film  300  to protect the pad electrode PAD or the metal line exposed when the bridge electrode BE is formed. However, in the display device  100  according to one embodiment of the present disclosure, since the metal line such as the third connection line  217  is not exposed by the first inorganic film  310  and the second inorganic film  330  when the bridge electrode BE is formed, it is not required to form the buffer layer. Therefore, in the display device  100  according to one embodiment of the present disclosure, the buffer layer is omitted, whereby the manufacturing cost may be reduced and the process may be reduced. 
     The bridge electrode BE is formed on the second inorganic film  330 . In order to prevent the first touch electrodes TE 1  and the second touch electrodes TE 2  from short-circuiting at their crossing areas, the bridge electrode BE electrically connects the first touch electrodes TE 1  adjacent to each other in a first direction. The bridge electrode BE is formed on a different layer from the first and second touch electrodes TE 1  and TE 2 , and may be connected to the first touch electrodes TE 1  adjacent to each other through bridge contact holes BCT. The bridge electrode BE may cross the second touch electrode TE 2 . 
     The insulating film  410  is arranged on the bridge electrode BE. The insulating film  410  is arranged to cover the bridge electrode BE, thereby insulating the bridge electrode BE from the first and second touch electrodes TE 1  and TE 2 . The insulating film  410  according to one embodiment of the present disclosure covers the bridge electrode BE, and is extended to the non-display area NDA, whereby the insulating film may be formed to reach the pad area PA. Also, the insulating film  410  according to one embodiment of the present disclosure may be extended to the pad area PA arranged outside the dam DAM. 
     In the display device  100  according to one embodiment of the present disclosure, since the insulating film  410  is extended to the pad area PA, it is not required to arrange a mask for covering the pad electrode PAD on the pad electrode PAD so as not to form the insulating film  410  on the pad area PA. 
     The first inorganic film  310 , the second inorganic film  330  and the insulating film  410  formed on the third connection line  217  may be removed simultaneously during the process of forming the bridge contact hole BCT. That is, the bridge contact hole BCT and the pad contact hole PCT may be formed at the same time. 
     The first touch electrodes TE 1  and the second touch electrodes TE 2  are arranged on the insulating film  410 . The first touch electrodes TE 1 , the second touch electrodes TE 2 , the first touch lines TL 1  and the second touch lines TL may be arranged on the same layer. The first touch electrodes TE 1  are arranged in a first direction (y-axis direction) and connected to each other, and the second touch electrodes TE 2  are arranged in a second direction (x-axis direction) and connected to each other. The first direction (y-axis direction) may be parallel with the scan lines S 1  to Sn, and the second direction (x-axis direction) may be parallel with the data lines DL 1  to DLm. Alternatively, the first direction (y-axis direction) may be parallel with the data lines DL 1  to DLm, and the second direction (x-axis direction) may be parallel with the scan lines S 1  to Sn. 
     Each of the first touch electrodes TE 1  connected in the first direction (y-axis direction) is electrically insulated from the first touch electrodes TE 1  adjacent thereto in the second direction (x-axis direction). Each of the second touch electrodes TE 2  connected in the second direction (x-axis direction) is electrically insulated from the second touch electrodes TE 2  adjacent thereto in the first direction (y-axis direction). 
     For this reason, mutual capacitance corresponding to the touch sensor may be formed on the crossed area of the first touch electrode TE 1  and the second touch electrode TE 2 . 
     Among the first touch electrodes TE 1  connected with each other in the first direction (y-axis direction), the first touch electrode TE arranged at one end may be connected to the first touch line TL 1  on the non-display area NDA. The first touch line TL 1  may be extended from the first touch electrode TE 1  and then patterned to reach the non-display area NDA. In more detail, the first touch line TL 1  according to one embodiment of the present disclosure is formed on the encapsulation film  300 , extended to the upper portion of the dam DAM, and electrically connected with the second connection line  216  arranged at a lower portion, by a touch contact hole TCT. That is, the first touch line TL 1  according to one embodiment of the present disclosure is not formed on the bending area BA. The first touch line TL 1  may electrically be connected from the first source-drain line  216 , the first connection line  215  and the third connection line  217  to the pad electrode PAD and then connected to the first touch driver  181  through the pad electrode PAD. Therefore, the first touch electrodes TE 1  connected with each other in the first direction (y-axis direction) may receive a driving pulse from the first touch driver  181  through the first touch line TL 1 . 
     Among the second touch electrodes TE 2  connected with each other in the second direction (x-axis direction), the second touch electrode TE 2  arranged at one end may be connected to the second touch line TL 2  on the non-display area NDA. The second touch line TL 2  may be extended from the second touch electrode TE 2  and then patterned to reach the non-display area NDA. In more detail, the second touch line TL 2  according to one embodiment of the present disclosure is formed on the encapsulation film  300 , extended to the upper portion of the dam DAM, and electrically connected with the second connection line  216  arranged at a lower portion, by a touch contact hole TCT. That is, the second touch line TL 2  according to one embodiment of the present disclosure is not formed on the bending area BA. The second touch line TL 2  may electrically be connected from the second connection line  216 , the first connection line  215  and the third connection line  217  to the pad electrode PAD and then connected to the second touch driver  182  through the pad electrode PAD. Therefore, the second touch driver  182  may receive the amount of charge changes in the touch sensors of the second touch electrodes TE 2  connected with each other in the second direction (x-axis direction). 
     The pad electrode PAD is arranged on the pad area PA arranged outside the dam DAM and the bending area BA. In more detail, the pad electrode PAD according to one embodiment of the present disclosure may be arranged on the second-source drain line  217 , the line protective film  243 , the first inorganic film  310 , the second inorganic film  330  and the insulating film  410  and overlapped with the first inorganic film  310  and the second inorganic film  330 . In the display device  100  according to one embodiment of the present disclosure, in order to prevent the metal line on the bending area BA from being externally exposed, the pad electrode PAD is electrically connected with the third connection line  217  through a pad contact hole that passes through the first inorganic film  310 , the second inorganic film  330  and the insulating film  410 . 
     The passivation film  420  is arranged on the first touch electrodes TE 1  and the second touch electrodes TE 2 . The passivation film  420  maintains characteristic stabilization of the display device by blocking a harmful environment from the outside. Also, the passivation film  420  may be formed not only on the first touch electrodes TE 1  and the second touch electrodes TE 2  but also between the first touch electrodes TE 1  and the second touch electrodes TE 2 . Each of the first touch electrodes TE 1  may be insulated from each of the second touch electrodes TE 2  by the passivation film  420 . 
     According to the embodiment of the present disclosure, since the touch sensing layer  40  is directly formed on the encapsulation layer  30 , it is not required to align the first substrate  111  and the second substrate  112  when the first substrate  111  and the second substrate  112  are bonded to each other. 
     As described above, in the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  is extended to the pad area PA, it is not required to arrange a mask for covering the pad area PA on the pad area PA so as not to form the first inorganic film  310  on the pad area PA. 
     Therefore, in the display device  100  according to one embodiment of the present disclosure, a mask is not arranged on the pad area PA to prevent arcing from being generated between a boundary surface of the mask and the pad electrode PAD arranged on the pad area PA or the metal line such as the third connection line  217  and prevent a defect from being generated due to a high current from the mask, which flows into the display device along the metal line. 
     Also, in the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  formed to reach the pad area PA serves as an insulating film, arcing is not generated even though the mask is arranged on the pad area PA during a manufacturing process of the second inorganic film  330 . 
     In the display device  100  according to one embodiment of the present disclosure, since the metal line such as the third connection line  217  is not exposed by the first inorganic film  310  and the second inorganic film  330  when the bridge electrode BE is formed, it is not required to form the buffer layer. Therefore, in the display device  100  according to one embodiment of the present disclosure, the buffer layer is omitted, whereby the manufacturing cost may be reduced and the process may be reduced. 
       FIG.  7    is a flow chart illustrating a method of manufacturing a display device according to one embodiment of the present disclosure, and  FIGS.  8 A to  8 F  are cross-sectional views illustrating a method of manufacturing a display device according to one embodiment of the present disclosure. 
       FIGS.  8 A to  8 F  relate to a method of manufacturing a display device according to one embodiment of the present disclosure shown in  FIG.  6   , and the same reference numerals are given to the same elements as those of  FIG.  6   . Hereinafter, the method of manufacturing a display device according to one embodiment of the present disclosure will be described with reference to  FIG.  7    and  FIGS.  8 A to  8 F . 
     First of all, as shown in  FIG.  8 A , pixels P are formed on the display area DA, and second and third connection  216  and  217 , an organic pattern  242  and a dam DAM are formed on the non-display area NDA surrounding the display area DA (S 701 ). 
     In more detail, an active layer  211  of a thin film transistor  210  is formed on a first substrate  111 . In more detail, an active metal layer is formed on the entire surface of the first substrate  111  by a sputtering method or a MOCVD (Metal Organic Chemical Vapor Deposition) method. Then, the active metal layer is patterned by a mask process using a photoresist pattern to form the active layer  211 . The active layer  211  may be formed of a silicon based semiconductor material or an oxide based semiconductor material. 
     Then, a gate insulating film  220  is formed on the active layer  211 . The gate insulating film  220  may be formed of an inorganic film, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx) or a multi-layered film of the silicon oxide film and the silicon nitride film. 
     Then, a gate electrode  212  of the thin film transistor  210  and a first connection line  215  are formed on the gate insulating film  220 . Specifically, a first metal layer is formed on the entire surface of the gate insulating film  220  by a sputtering method or a MOCVD method. Then, the first metal layer is patterned by a mask process using a photoresist pattern to form the gate electrode  212  and the first connection line  215 . The gate electrode  212  and the first connection line  212  may be formed of a single layer or multi-layer comprised of any one of Mo, Al, Cr, Au, Ti, Ni, Nd and Cu or their alloy. 
     Then, an inter-layer dielectric film  230  is formed on the gate electrode  212 . The inter-layer dielectric film  230  may be formed of an inorganic film, for example, a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multi-layered film of the silicon oxide film and the silicon nitride film. 
     Then, contact holes for exposing the active layer  211  by passing through the gate insulating film  220  and the inter-layer dielectric film  230  and contact holes for exposing the first connection line  215  by passing through the inter-layer dielectric film  230  are formed. 
     Then, source and drain electrodes  213  and  214  and the second and third connection lines  216  and  217  of the thin film transistor  210  are formed on the inter-layer dielectric film  230 . Specifically, a second metal layer is formed on the entire surface of on the inter-layer dielectric film  230  by a sputtering method or a MOCVD method. Then, the second metal layer is patterned by a mask process using a photoresist pattern to form the source and drain electrodes  213  and  214  and the second and third connection lines  216  and  217 . Each of the source and drain electrodes  213  and  214  may be connected to the active layer  211  through contact holes that pass through the gate insulating film  220  and the inter-layer dielectric film  230 . Also, the second and third connection lines  216  and  217  may be connected to the first connection line  215  through contact holes that pass through the inter-layer dielectric film  230 . Each of the source and drain electrodes  213  and  214  and the second and third connection lines  216  and  217  may be formed of a single layer or multi-layer comprised of any one of Mo, Al, Cr, Au, Ti, Ni, Nd and Cu or their alloy. 
     Then, a planarization film  241  for planarizing a step difference due to the thin film transistor  210  is formed on the source and drain electrodes  213  and  214  of the thin film transistor  210 . An organic pattern  242  and a line protective film  243  are arranged on the second and third connection lines  216  and  217 . The planarization film  241 , the organic pattern  242  and the line protective film  243  may be formed at the same time, and may be formed of an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin. Meanwhile, the line protective film  243  may be formed at a height lower than those of the planarization film  241  and the organic pattern  242 . 
     Then, an organic light emitting diode  250  is formed on the planarization film  241 . Specifically, a first electrode  251  of the organic light emitting diode  250  is formed on the planarization film  241 . More specifically, a third metal layer is formed on the entire surface of the planarization film  241  using a sputtering method or a MOCVD method. Then, the third metal layer is patterned by a mask process using a photoresist pattern to form the first electrode  251 . The first electrode  251  may be connected to the source electrode  213  of the thin film transistor  210  through a contact hole that passes through the planarization film  241 . The first electrode  251  may be formed of a conductive material with high reflexibility such as a deposition structure (Ti/Al/Ti) of Al and Ti, a deposition structure (ITO/Al/ITO) of Al and ITO, an APC alloy, or a deposition structure (ITO/APC/ITO) of APC alloy and ITO. 
     Then, in order to partition the pixels P, a bank  260  is formed on the planarization film  241  to cover an edge of the first electrode  251 , and a dam DAM is also formed together with the bank  260 . In this case, the dam DAM is formed on the non-display area NDA. Each of the dam DAM and the bank  260  may be formed of an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin. 
     Meanwhile, the dam DAM is formed simultaneously with the bank  260  but is not limited to this example. The dam DAM may be formed simultaneously with the planarization film  241 . 
     Then, an organic light emitting layer  252  is formed on the first electrode  251  and the bank  260  by a deposition process or a solution process. Then, the second electrode  253  is formed on the organic light emitting layer  252 . The second electrode  253  may be a common layer that is commonly formed on the pixels P. The second electrode  253  may be formed of a transparent conductive material (TCO) such as ITO and IZO, which may transmit light. The second electrode  253  may be formed by physics vapor deposition such as a sputtering method. A capping layer may be formed on the second electrode  253 . 
     Secondly, as shown in  FIG.  8 B , a first inorganic film  310  is entirely formed on the first substrate  111  (S 702 ). 
     The first inorganic film  310  according to one embodiment of the present disclosure covers the second electrode  253 , and is extended to the non-display area NDA to cover the dam DAM and the third connection line  217 . In the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  is extended to the pad area PA, it is not required to arrange a mask for covering the pad area PA on the pad area PA so as not to form the first inorganic film  310  on the pad area PA. Therefore, in the display device  100  according to one embodiment of the present disclosure, a mask is not arranged on the pad area PA to prevent arcing from being generated between a boundary surface of the mask and the metal line and prevent a defect from being generated due to a high current from the mask, which flows into the display device. 
     Thirdly, as shown in  FIG.  8 C , an organic film  320  is formed on the first inorganic film  310 , a second inorganic film  330  is entirely formed on the first substrate  111 , and a bridge electrode BE is formed on the second inorganic film  330  (S 703 ). 
     The organic film  320  is formed to cover the first inorganic film  310 . The organic film  320  is preferably formed with a sufficient thickness to prevent particles from being permeated into the organic light emitting layer  252  and the second electrode  253  by passing through the first inorganic film  310 . The second inorganic film  330  is entirely formed on the first substrate  111  to cover the organic film  320 . 
     Each of the first and second inorganic films  310  and  330  may be formed of a silicon oxide, a silicon nitride, a silicon oxynitride, an aluminum oxide, an aluminum nitride, a zirconium nitride, a titanium nitride, a hafnium nitride, a tantalum nitride, or a titanium oxide. The organic film  320  may be formed of acrylic resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin. Then, the bridge electrode BE is formed on the display area DA of the second inorganic film  330 . At this time, the bridge electrode BE may be formed to, but not limited to, overlap the bank  260 . 
     In the display device  100  according to one embodiment of the present disclosure, the buffer layer is not formed on the encapsulation film  300 , and the bridge electrode BE is formed on the encapsulation film  300 . In the related art, the buffer layer is formed on the encapsulation film  300  to protect the metal line exposed when the bridge electrode BE is formed. However, in the display device  100  according to one embodiment of the present disclosure, since the metal lines are not exposed by the first inorganic film  310  when the bridge electrode BE is formed, it is not required to form the buffer layer. Therefore, in the display device  100  according to one embodiment of the present disclosure, the buffer layer is omitted, whereby the manufacturing cost may be reduced and the process may be reduced. 
     According to the process of forming the bridge electrode BE, a fourth metal layer is formed on the entire surface of the second inorganic film  330  by a sputtering method or a MOCVD method. Then, the fourth metal layer is patterned by a mask process using a photoresist pattern to form the bridge electrode BE. 
     Fourthly, as shown in  FIG.  8 D , an insulating film  410  is entirely formed on the first substrate  111  (S 704 ). 
     The insulating film  410  according to one embodiment of the present disclosure covers the bridge electrode BE, and is extended to the non-display area NDA to cover the dam DAM and the third connection line  217 . In the display device  100  according to one embodiment of the present disclosure, since the insulating film  410  is extended to the pad area PA, it is not required to arrange a mask for covering the pad area PA on the pad area PA so as not to form the insulating film  410  on the pad area PA. 
     Fifthly, as shown in  FIG.  8 E , a bridge contact hole BCT, a touch contact hole TCT, an open hole OH, and a pad contact hole PCT are formed (S 705 ). 
     The bridge contact hole BCT exposes the bridge electrode BE by passing through the insulating film  410 . The touch contact hole TCT exposes the second connection line  216  by passing through the first and second inorganic films  310  and  330  and the insulating film  410 . The open hole OH exposes the organic pattern  242  by passing through the first and second inorganic films  310  and  330  and the insulating film  410 . The pad contact hole PCT exposes third connection line  217  by passing through the first and second inorganic films  310  and  330  and the insulating film  410 . The bridge contact hole BCT, the touch contact hole TCT, the open hole OH, and the pad contact hole PCT may simultaneously be formed by an etching process. 
     The bridge electrode BE may be connected to first touch electrodes TE 1  through the bridge contact hole BCT, which passes through the insulating film  410 , to electrically connect the first touch electrodes TE 1 . 
     The first and second touch lines TL 1  and TL 2  may electrically be connected to the second connection line  216  through the touch contact hole TCT that passes through the first and second inorganic films  310  and  330  and the insulating film  410 . 
     The pad electrode PAD may electrically be connected to the third connection line  217  through the pad contact hole PCT that passes through the first and second inorganic films  310  and  330  and the insulating film  410 . 
     Sixthly, as shown in  FIG.  8 F , the first and second touch electrodes TE 1  and TE 2 , the first and second touch lines TL 1  and TL 2  and the pad electrode PAD are formed, and the passivation film  420  is formed (S 706 ). 
     In detail, the first touch electrodes TE 1 , the second touch electrodes TE 2 , the first and second touch lines TL 1  and TL 2  and the pad electrode PAD are formed on the insulating film  410 . The first touch electrodes TE 1  are arranged in a first direction to be spaced apart from each other at a constant space, and the second touch electrodes TE 2  are arranged in a second direction to be connected to each other. In this case, each of the first touch electrodes TE 1  and the second touch electrodes TE 2  may have shapes of a rectangle, an octagon, a circle, or a rhombus. 
     Among the first touch electrodes TE 1  connected with each other in the first direction, the first touch electrode TE 1  arranged at one end may be connected to the first touch line TL 1  on the non-display area NDA. The first touch line TL 1  may be extended from the first touch electrode TE 1  and then patterned to reach the upper portion of the dam DAM. The first touch electrode TE 1 , the first touch line TL 1  and the pad electrode PAD may be formed on the same layer, and may be formed of the same material. 
     Among the second touch electrodes TE 2  connected with each other in the second direction, the second touch electrode TE 2  arranged at one end may be connected to the second touch line TL 2  on the non-display area NDA. The second touch line TL 2  may be extended from the second touch electrode TE 2  and then patterned to reach the upper portion of the dam DAM. The second touch electrode TE 2 , the second touch line TL 2  and the pad electrode PAD may be formed on the same layer, and may be formed of the same material. 
     The first touch electrodes TE 1 , the second touch electrodes TE 2 , the first touch lines TL 1 , and the second touch lines TL 2  may be formed of a transparent conductive material (TCO) such as ITO and IZO, which may transmit light. 
     A fifth metal layer is formed on the entire surface of the insulating film  410  by a sputtering method or a MOCVD method. Then, the fifth metal layer is patterned by a mask process using a photoresist pattern to form the first touch electrodes TE 1 , the second touch electrodes TE 2 , the first touch lines TL 1 , the second touch lines TL 2  and the pad electrode PAD. 
     Then, a passivation film  420  is formed on the first touch electrode TE 1  and the second touch electrode TE 2 . 
     Although not shown in detail, the first substrate  111  where the passivation film  420  is formed is bonded to the second substrate  112 . The first substrate  111  and the second substrate  112  may be bonded to each other in such a manner that the passivation film  420  of the first substrate  111  and the second substrate  112  are adhered to each other using an adhesive layer (not shown). The adhesive layer (not shown) may be an optically clear resin (OCR) or an optically clear adhesive film (OCA). 
     In the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  is extended to the pad area PA, it is not required to arrange a mask for covering the pad area PA so as not to form the first inorganic film  310  on the pad area PA. Therefore, in the display device  100  according to one embodiment of the present disclosure, a mask is not arranged on the pad area PA to prevent arcing from being generated between a boundary surface of the mask and the pad electrode and prevent a defect from being generated due to a high current from the mask, which flows into the display device. 
       FIGS.  9 A to  9 D  are cross-sectional views illustrating a method of manufacturing a display device according to another embodiment of the present disclosure. 
     Plane views shown in  FIGS.  9 A to  9 D  relate to a method of manufacturing a display device according to one embodiment of the present disclosure shown in  FIG.  6   , and the same reference numerals are given to the same elements as those of  FIG.  6   . Also, the method of manufacturing a display device according to another embodiment of the present disclosure relates to a method of forming a bridge contact hole BCT, a touch contact hole TCT, an open hole OH, and a pad contact hole PCT. Therefore, the following description will be given based on a method of manufacturing a bridge contact hole BCT, a touch contact hole TCT, an open hole OH, and a pad contact hole PCT, and repeated description of the same elements will be omitted. 
     First of all, as shown in  FIG.  9 A , an insulating film  410  is entirely formed on a first substrate  111 . 
     Secondly, as shown in  FIG.  9 B , after a first inorganic film  310  provided on the second and third connection lines  216  and  217  and an organic pattern  242  partially remains, a second inorganic film  330  on a touch contact hole TCT 1 , an open hole OH 1  and a pad contact hole PCT 1 , and the insulating film  410  are removed. At this time, a bridge contact hole BCT is not formed. If the bridge contact hole BCT, the touch contact hole TCT, the open hole OH and the pad contact hole PCT are simultaneously formed through an etching process like one embodiment, the bridge electrode BE and the second and third connection lines  216  and  217  may be damaged. Therefore, in the method of manufacturing a display device according to another embodiment of the present disclosure, the touch contact hole TCT 1 , the open hole OH 1  and the pad contact hole PCT 1 , which should pass through a relatively thick layer, are first formed such that the first inorganic film  310  may partially remain, and the bridge contact hole BCT is not formed. 
     Thirdly, as shown in  FIG.  9 C , the bridge contact hole BCT, the touch contact hole TCT, the open hole OH and the pad contact hole PCT are formed. 
     The first inorganic film  310 , which partially remains in the touch contact hole TCT, the open hole OH and the pad contact hole PCT 1 , and the insulating film  410  on the bridge electrode BE are simultaneously removed through an etching process. The first inorganic film  310  which remains at a relatively thin thickness and the insulating film  410  on the bridge electrode BE are removed through an weak etching process such that the second and third connection lines  216  and  217  and the bridge electrode BE may not be damaged. Therefore, in the method of manufacturing a display device according to another embodiment of the present disclosure, the second and third connection lines  216  and  217  and the bridge electrode BE may be prevented from being damaged when the bridge contact hole BCT, the touch contact hole TCT, the open hole OH and the pad contact hole PCT are formed. 
     Fourthly, as shown in  FIG.  9 D , first and second touch electrodes TE 1  and TE 2 , first and second touch lines TL 1  and TL 2 , and a pad electrode PAD are formed, and a passivation film  420  is formed. 
     The display device  100 , which is shown in  FIGS.  9 A and  9 D , is the same as the display device  100  according to one embodiment described with reference to  FIGS.  8 A to  8 F . Therefore, repeated description of the same elements will be omitted. 
     As described above, in the display device  100  according to one embodiment of the present disclosure, a mask is not arranged on the pad area PA to prevent arcing from being generated between a boundary surface of the mask and the pad electrode PAD arranged on the pad area PA or the metal line such as the third connection line  217  and prevent a defect from being generated due to a high current from the mask, which flows into the display device along the metal line. 
     Also, in the display device  100  according to one embodiment of the present disclosure, since the first inorganic film  310  formed to reach the pad area PA serves as an insulating film, arcing is not generated even though the mask is arranged on the pad area PA during the manufacturing process of the second inorganic film  330 . 
     In the display device  100  according to one embodiment of the present disclosure, since the metal line such as the third connection line  217  is not exposed by the first inorganic film  310  and the second inorganic film  330  when the bridge electrode BE is formed, it is not required to form the buffer layer. Therefore, in the display device  100  according to one embodiment of the present disclosure, the buffer layer is omitted, whereby the manufacturing cost may be reduced and the process may be reduced. 
     As described above, according to the present disclosure, the following advantages may be obtained. 
     In the display device according to one embodiment of the present disclosure, since the first inorganic film is formed to be extended to the pad area, it is not required to arrange the mask for covering the pad area so as not to form the first inorganic film on the pad area. 
     Therefore, in the display device according to one embodiment of the present disclosure, the mask is not arranged on the pad area to prevent arcing from being generated between the boundary surface of the mask and the pad electrode arranged on the pad area or the metal line and prevent a defect from being generated due to a high current from the mask, which flows into the display device along the metal line. 
     Also, in the display device according to one embodiment of the present disclosure, since the metal line is not exposed by the first inorganic film when the bridge electrode is formed, the buffer layer is omitted, whereby the manufacturing cost may be reduced and the process may be reduced. 
     In addition to the effects of the present disclosure as mentioned above, additional advantages and features of the present disclosure will be clearly understood by those skilled in the art from the above description of the present disclosure. 
     It will be apparent to those skilled in the art that the present disclosure described above is not limited by the above-described embodiments and the accompanying drawings and that various substitutions, modifications, and variations can be made in the present disclosure without departing from the spirit or scope of the disclosures. Consequently, the scope of the present disclosure is defined by the accompanying claims, and it is intended that all variations or modifications derived from the meaning, scope, and equivalent concept of the claims fall within the scope of the present disclosure. 
     These and other changes can be made to the embodiments in light of the above-detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.