Patent Publication Number: US-11656701-B2

Title: Display device with touch sensor

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application of U.S. patent application Ser. No. 15/438,278, filed on Feb. 21, 2017, which claims the benefit of Korean Patent Application No. 10-2016-0126761, filed on Sep. 30, 2016, which is hereby incorporated by reference as if fully set forth herein. 
    
    
     BACKGROUND 
     Field 
     An embodiment of the present disclosure relates to an organic light emitting display device with a touch sensor and a method of manufacturing the same, and more particularly, to an organic light emitting display device with a touch sensor and a method of manufacturing the same to simplify a manufacturing process and reduce manufacturing costs. 
     Discussion of the Related Art 
     A touchscreen is a device for inputting a user&#39;s command by selecting an instruction shown on a screen of a display or the like with the hand of the user or an object. That is, the touchscreen converts a contact position thereof that directly contacts the hand of the user or the object into an electrical signal and receives the instruction selected in the contact position as an input signal. Such a touchscreen can replace an additional input device such as a keyboard or mouse which is operated in connection with a display and application thereof is thus gradually expanding. 
     In general, such a touchscreen is often attached to the front surface of a display panel such as a liquid crystal display panel or an organic electroluminescent display panel through an adhesive agent. In this case, there are problems of complicated overall process and increased costs resulting from an additional attachment process, because the touchscreen is separately produced and is attached to the front surface of the display panel. 
     SUMMARY 
     One embodiment of the present disclosure is an organic light emitting display device with a touch sensor that substantially obviate one or more problems due to limitations and disadvantages of the related art. 
     An object of at least one embodiment of the present disclosure is to provide an organic light emitting display device with a touch sensor to simplify a manufacturing process and reduce manufacturing costs. 
     Additional advantages, objects, and features of the disclosure will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     In one embodiment, an organic light emitting display device with a touch sensor removes the necessity of an additional adhesion process by directly disposing a touch sensor including a touch sensing line and a touch driving line and a color filter on an encapsulation layer disposed to cover the light emitting device, thereby simplifying the manufacturing process and reducing manufacturing costs. 
     It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. 
     In one embodiment, a display device comprises at least one light emitting device on a substrate. An encapsulation layer is on the at least one light emitting device. An insulating layer is between the substrate and the encapsulation layer. A touch sensor is on the encapsulation layer. The touch sensor has a touch sensing line and a touch driving line intersecting each other. A touch pad is electrically connected to the touch sensor and is in contact with the insulating layer. 
     In one embodiment, a display device comprises at least one light emitting device on a substrate. An encapsulation layer is on the at least one light emitting device. A touch sensor is on the encapsulation layer. The touch sensor has a touch sensing line and a touch driving line intersecting each other. A routing line is electrically connected to the touch sensor. The routing line covers a side surface of the encapsulation layer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the principles of the disclosure. In the drawings: 
         FIG.  1    is a perspective view illustrating an organic light emitting display device with a touch sensor according to a first embodiment of the present disclosure; 
         FIG.  2    is a plan view illustrating the organic light emitting display device with a touch sensor shown in  FIG.  1   ; 
         FIG.  3    is a sectional view illustrating the organic light emitting display device with a touch sensor taken along lines I-I and II-II of  FIG.  2   ; 
         FIG.  4    is a sectional view illustrating an organic light emitting display device with a touch sensor according to a second embodiment of the present disclosure; 
         FIG.  5    is a sectional view illustrating an organic light emitting display device with a touch sensor according to a third embodiment of the present disclosure; 
         FIG.  6    is a sectional view illustrating an organic light emitting display device with a touch sensor according to a fourth embodiment of the present disclosure; 
         FIG.  7    is a sectional view illustrating an organic light emitting display device with a touch sensor according to a fifth embodiment of the present disclosure; 
         FIGS.  8 A to  8 D  are sectional views illustrating a method of manufacturing the organic light emitting display device with a touch sensor shown in  FIG.  4   ; and 
         FIG.  9    is a sectional view illustrating touch electrodes and bridges according to another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the preferred embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
     It will be understood that when an element is referred to as being “connected to” or “coupled to” another element, not only can it be “directly connected or coupled to” the other element, but it can also be “indirectly connected or coupled to” the other element via an “intervening” element. In the same context, it will be understood that when an element is referred to as being “on” or “under” another element, not only can it be directly on or under another element, but it can also be indirectly on or under another element via an intervening element. 
     Hereinafter, embodiments of the present disclosure will be described with reference to the annexed drawings in detail. 
       FIGS.  1  and  2    are a perspective view and a plan view illustrating an organic light emitting display device with a touch sensor according to an embodiment of the present disclosure, respectively. 
     The organic light emitting display device with a touch sensor illustrated in  FIGS.  1  and  2    detects variation in mutual capacitance (Cm) by touch of a user through touch electrodes  152   e  and  154   e  during a touch period to sense presence of touch and position thereof. In addition, the organic light emitting display device with a touch sensor displays an image through a unit pixel including a light emitting device  120  during a display period. The unit pixel includes red (R), green (G) and blue (B) sub-pixels (PXL), or red (R), green (G), blue (B) and white (W) sub-pixels (PXL). 
     For this purpose, the organic light emitting display device shown in  FIG.  1    includes a plurality of sub-pixels (PXL) disposed in the form of a matrix on a substrate  111 , a encapsulation layer  140  disposed on the sub-pixels (PXL), and a touch sensor and a color filter  192  disposed on the encapsulation layer  140 . The color filter  192  can be a single color filter layer that includes red R portions, green G portions and blue B portions. 
     Each of the sub-pixels (PXL) includes a pixel driving circuit and a light emitting device  120  connected to the pixel driving circuit. 
     The pixel driving circuit includes a switching transistor (T 1 ), a driving transistor (T 2 ) and a storage capacitor (Cst). 
     The switching transistor (T 1 ) is turned on when a scan pulse is supplied to a scan line (SL) and supplies a data signal supplied to a data line (DL) to the storage capacitor (Cst) and a gate electrode of the driving transistor (T 2 ). 
     In response to the data signal supplied to the gate electrode of the driving transistor (T 2 ), the driving transistor (T 2 ) controls a current (I) supplied from a high-voltage power (VDD) line to the light emitting device  120 , thereby regulating the amount of light emitted by the light emitting device  120 . In addition, although the switching transistor (T 1 ) is turned off, the driving transistor (T 2 ) supplies a predetermined current (I) by the voltage charged in the storage capacitor (Cst) until a data signal of the next frame is supplied, thereby maintaining light emission of the light emitting device  120 . 
     As illustrated in  FIG.  3   , the driving transistors (T 2 )  130  include a gate electrode  132 , a semiconductor layer  134  overlapping the gate electrode  132  via a gate insulation layer  112 , and source and drain electrodes  136  and  138  formed on the protective insulation layer  114  and contacting the semiconductor layer  134 . 
     The light emitting device  120  includes an anode  122 , at least one light emitting stack  124  formed on the anode  122 , and a cathode  126  formed on the light emitting stack  124 . In one embodiment, the light emitting device  120  is an organic light emitting diode (OLED) that converts electric energy into light. 
     The anode  122  is electrically connected to a drain electrode  138  of the driving transistor  130  exposed through a pixel contact hole passing through a planarization layer  116 . The light emitting stack  124  is formed on the anode  122  of a light emission region provided by a bank  128 . Each of at least one light emitting stack  124  is formed by stacking a hole-related layer, an organic light emitting layer and an electron-related layer in order or reverse order on the anode  122  and generates white light incident upon the color filter  192 . For example, the light emitting stack  124  includes first and second light emitting stacks facing each other via a charge generation layer. In this case, any one light emitting layer of the first and second light emitting stacks generates blue light, and the other light emitting layer of the first and second light emitting stacks generates yellow-green light, thereby generating white light through the first and second light emitting stacks. The cathode  126  faces the anode  122  via the light emitting stack  124 . 
     The encapsulation layer  140  blocks permeation of exterior moisture or oxygen to the light emitting device  120  that is vulnerable thereto. For this purpose, the encapsulation layer  140  includes a plurality of inorganic encapsulation layers  142  and  146 , and an organic encapsulation layer  144  interposed between the inorganic encapsulation layers  142  and  146 , wherein the inorganic encapsulation layer  146  is disposed as an uppermost layer. In this case, the encapsulation layer  140  includes at least two inorganic encapsulation layers  142  and  146 , and at least one organic encapsulation layer  144 . An example of the encapsulation layer  140  having a structure in which the organic encapsulation layer  144  is disposed between the first and second inorganic encapsulation layers  142  and  146  will be described. 
     The first inorganic encapsulation layer  142  is formed on the substrate  101  provided with the cathode  126  such that it is the closest to the light emitting device  120 . The first inorganic encapsulation layer  142  is formed using an inorganic insulating material that can be deposited at a low temperature, such as silicon nitride (SiN x ), silicon oxide (SiO x ), silicon oxynitride (SiON) or aluminum oxide (Al 2 O 3 ). Accordingly, since the first inorganic encapsulation layer  142  is deposited at a low temperature, it is possible to prevent damage to the organic light emitting layer of the light emitting stack  124  vulnerable to high temperatures upon deposition of the first inorganic encapsulation layer  142 . 
     The organic encapsulation layer  144  functions as a buffer reducing stress between the respective layers resulting from the bending of the organic light emitting display and improves planarization performance. The organic encapsulation layer  144  is formed using an organic insulating material such as an acrylic resin, an epoxy resin, polyimide, polyethylene or silicon oxycarbide (SiOC). 
     The second inorganic encapsulation layer  146  is formed on the substrate  111  provided with the organic encapsulation layer  144  such that it covers the upper and side surfaces of each of the organic encapsulation layer  144  and the first inorganic encapsulation layer  142 . Accordingly, the second inorganic encapsulation layer  146  minimizes or prevents permeation of exterior moisture or oxygen into the first inorganic encapsulation layer  142  and the organic encapsulation layer  144 . The second inorganic encapsulation layer  146  is formed using an inorganic insulating material such as silicon nitride (SiN x ), silicon oxide (SiO x ), silicon oxynitride (SiON) or aluminum oxide (Al 2 O 3 ). 
     The color filter  192  and the touch sensor are disposed on the encapsulation layer  140 . The color filter  192  is between the encapsulation layer  140  and the touch sensor (e.g.  152  and  154 ). 
     The color filter  192  is directly disposed on the encapsulation layer  140  such that it overlaps the light emitting region provided by the bank  128 . Accordingly, white light generated in the light emitting device  120  is emitted through the color filter  192  to realize a color image. Meanwhile, the color filter  192  is formed using a material that can be produced at a low temperature (about 100 degrees Celsius or less) to protect the light emitting stack  124 , which is vulnerable to high temperatures. 
     The color filter  192  is directly disposed on and contacts the encapsulation layer  140  covering the light emitting devices  120 . In this case, since the color filter  192  and the light emitting devices  120  are disposed on the same substrate  111 , the present disclosure does not need an additional joining process, thus simplifying the overall process and reducing manufacturing costs. On the other hand, since a related organic light emitting display has a structure in which the color filter  192  and the light emitting devices  120  are disposed on different substrates, it needs a process of joining a substrate provided with the color filter  192  to a substrate provided with the light emitting devices  120 , thus having problems of increased process complexity and manufacturing costs. 
     As such, a black matrix  194  is disposed between individual sub-pixel regions of the color filter  192  according to the present disclosure to divide respective sub-pixel regions and prevent light interference between adjacent sub-pixel regions and light leakage. In this case, the black matrix  194  overlaps the bank  128  between the sub-pixel regions. The black matrix  194  is formed using a high-resistance black insulating material or is formed by stacking at least two color filters among red (R), green (R) and blue (B) color filters  192 . 
     A touch sensor which includes multiple touch sensing lines  154  and a touch driving lines  152  crossing each other via a touch insulating layer  158  is disposed on the substrate  111  provided with the color filter  192  and the black matrix  194 . For example, the touch sensing line  154  and the touch driving line  152  are disposed on the color filter  192 . 
     The touch driving line  152  includes a plurality of first touch electrodes  152   e , and first bridges  152   b  for electrically connecting the first touch electrodes  152   e  to one another. 
     The first touch electrodes  152   e  are spaced from one another by a predetermined distance along a Y direction on the color filter  192  and the black matrix  194 , or the color filter  192 . Each of the first touch electrodes  152   e  is electrically connected to an adjacent first touch electrode  152   e  through a first bridge  152   b.    
     The first bridge  152   b  is disposed on the black matrix  194  and is electrically connected to the first touch electrode  152   e  without an additional contact hole. 
     The touch sensing line  154  includes a plurality of second touch electrodes  154   e , and second bridges  154   b  for electrically connecting the second touch electrodes  154  to one another. 
     The second touch electrodes  154   e  are spaced from one another by a predetermined distance along an X direction on the color filter  192  and the black matrix  194 , or the color filter  192 . Each of the second touch electrodes  154   e  is electrically connected to an adjacent second touch electrode  154   e  through a second bridge  154   b.    
     The second bridge  154   b  is formed on the touch insulation layer  158  and is electrically connected to the second touch electrode  154   e  exposed by the touch contact hole  150  passing through the touch insulation layer  158 . Similar to the first bridge  152   b , the second bridge  154   b  overlaps the bank  128 , thus preventing deterioration of opening ratio by the first and second bridges  152   b  and  154   b.    
     As such, the touch sensing lines  154  intersect one another via the touch driving line  152  and the touch insulation layer  158  to form a mutual capacitance (Cm) at the intersection between the touch sensing line  154  and the touch driving line  152 . The mutual capacitance (Cm) is charged with electric charge by a touch driving pulse supplied to the touch driving line  152  and discharges the electric charge to the touch sensing line  154 . 
     Meanwhile, the touch driving line  152  and the touch sensing line  154  according to the present disclosure are electrically connected to a touch driving part (not shown) through a routing line  156  and a touch pad  170 , respectively. 
     Accordingly, the routing line  156  transmits a touch driving pulse generated in the touch driving part through the touch pad  170  to the touch driving line  152 , and transmits a touch sensing signal from the touch sensing line  154  to the touch pad  170 . The routing line  156  is disposed between each of the first and second touch electrodes  152   e  and  154   e , and the touch pad  170 , and is electrically connected to each of the first and second touch electrodes  152   e  and  154   e , without an additional contact hole. 
     As shown in  FIG.  2   , the routing line  156  connected to the first touch electrode  152   e  extends along at least one side of upper and lower sides of an active region and is connected to the touch pad  170 . The routing line  156  connected to the second touch electrode  154   e  extends along at least one side of left and right sides of the active region and is connected to the touch pad  170 . Meanwhile, the disposition of the routing line  156  is not limited to the structure shown in  FIG.  2    and is variably changed depending on the design specifications of the display. 
     As shown in  FIG.  3   , the routing line  156  slopes downwards at an angle towards the substrate  111  and touch pad  170 . The sloped portion of the routing line at least partially covers a side surface of the encapsulation layer  140  and is in direct contact with the side surface of the encapsulation layer  140 . The routing line  156  also has a stepped shape that follows the shape of the underlying layers that the routing line  156  is in contact with. 
     The routing line  156  is formed as a monolayer or multilayer structure using a first conductive layer with excellent corrosion resistance, acid resistance and conductivity such as Al, Ti, Cu or Mo. For example, the routing line is formed as a three-layer stack structure such as Ti/Al/Ti or Mo/Al/Mo, or is formed as a multilayer structure including a transparent conductive layer with excellent corrosion resistance and acid resistance, such as ITO or IZO, and a non-transparent conductive layer with excellent conductivity, such as Ti/Al/Ti or Mo/Al/Mo. 
     The touch pad  170  is in a non-display area of the display device and is electrically connected to the touch sensor (e.g.  154  and  152 ) via the routing line  156 . The touch pad  170  includes a pad electrode  172 , and a pad cover electrode  174  formed on the pad electrode  172  such that the pad cover electrode  174  covers the pad electrode  172 . The pad electrode  172  is in direct contact with the protective insulation layer  114 . In some embodiments, the pad electrode  172  may be in direct contact with the gate insulation layer  112 . The gate insulation layer  112  and protective insulation layer  114  are both located between the substrate  111  and the encapsulation layer  140 . 
     The pad electrode  172  extends from the routing line  156  and is formed using the same material as the routing line  156 . The pad cover electrode  174  is formed using the same material as the second bridge  154   b  and is disposed to cover the pad electrode  172  exposed by the touch insulation layer  158 . The pad cover electrode  174  is formed to be exposed by the touch barrier layer  176  so that it can be connected to a touch driving part. 
     Here, the touch barrier layer  176  is formed to cover the touch sensing line  154  and the touch driving line  152 , thereby preventing damage to the light emitting devices  120  as well as the touch sensing line  154  and the touch driving line  152  by exterior moisture or the like. The touch barrier layer  176  is formed by coating an organic insulating layer with an inorganic insulating layer. An optical film  178  such as a circular polarizer or brightness improvement film (OLED transmittance controllable film, OTF) may be disposed on the touch barrier layer  176 . 
     As such, the organic light emitting display with a touch sensor according to the first embodiment of the present disclosure has a structure in which the touch electrodes  152   e  and  154   e  are formed on the encapsulation layer  140  during manufacturing of the display. Accordingly, as compared to a related organic light emitting display in which a touchscreen is attached to the organic light emitting display by an adhesive agent, an embodiment of the present disclosure does not require an adhesion process, thus simplifying the manufacturing process and reducing manufacturing costs. 
     All the layers shown in  FIG.  3    as formed on a single substrate  111 . In one embodiment, substrate  111  may be the only substrate in the display device. 
       FIG.  4    is a sectional view illustrating an organic light emitting display with a touch sensor according to a second embodiment of the present disclosure. 
     The organic light emitting display with a touch sensor illustrated in  FIG.  4    includes the same elements as the organic light emitting display illustrated in  FIG.  3   , except that the organic light emitting display further includes a touch buffer layer  166  interposed between each of the color filter  192  and the black matrix  194 , and the touch electrodes  152   e  and  154   e . Accordingly, detailed description of the same elements will be omitted. 
     The touch buffer layer  166  is formed on the color filter  192  and the black matrix  194  so as to cover the color filter  192  and the black matrix  194 . The first and second touch electrodes  152   e  and  154   e , and the first bridge  152   b  are formed on the touch buffer layer  166 . The location of the touch buffer layer  166  causes it to be between the touch electrodes  152   e  and  154   e  and lower layers such as the color filter  192  and encapsulation layer  140 . 
     In this case, the touch buffer layer  166  is formed to have a thickness of about 500 Å to 5 μm and the distance between each of the touch sensing line  154  and the touch driving line  152 , and the cathode  126  is maintained at 5 μm or more. Accordingly, the capacitance of a parasitic capacitor formed between each of the touch sensing line  154  and the touch driving line  152 , and the cathode  126  can be minimized and mutual capacitive effect caused by capacitive coupling between each of the touch sensing line  154  and the touch driving line  152 , and the cathode  126  can thus be prevented. Meanwhile, when the distance between each of the touch sensing line  154  and the touch driving line  152 , and the cathode  126  is less than 5 μm, touch performance is deteriorated due to mutual capacitance effect caused by capacitive coupling between each of the touch sensing line  154  and the touch driving line  152 , and the cathode  126 . 
     In addition, the touch buffer layer  166  prevents permeation of a reagent (such as a developing solution or etching solution) used for manufacturing the touch sensing line  154  and the touch driving line  152  or exterior moisture from penetrating into the light emitting stack  124 . Accordingly, the light emitting stack  124 , which is vulnerable to the reagent or moisture, is protected by the touch buffer layer  166  and damage to the light emitting stack  124  can be prevented. 
     In order to prevent damage to the light emitting stack  124 , which is vulnerable to high temperatures, the touch buffer layer  166  can be formed using an organic insulating material which can be formed at a low temperature of 100 degrees Celsius (° C.) or less and has a low dielectric constant of 1 to 3. For example, the touch buffer layer  166  is formed using an acrylic, epoxy or siloxane material. The touch buffer layer  166  prevents damage to the respective sealing layers  142 ,  144  and  146  inside the encapsulation layer  140 , resulting from bending of the organic light emitting display and also prevents breakage of the touch sensing line  154  and the touch driving line  152  formed on the touch buffer layer  166 . The touch buffer layer  166  also serves as a planarization layer. 
     Additionally, the routing line  156  at least partially covers both the side surface of the encapsulation layer  140  and the side surface of the touch buffer layer  166 . The sloped portion of the routing line  156  extends downwards along the side surface of the touch buffer layer  166 , and is in direct contact with the side surface of the touch buffer layer  166 . 
     As such, the organic light emitting display with a touch sensor according to the second embodiment of the present invention has a structure in which the touch electrodes  152   e  and  154   e  are formed on the encapsulation layer  140  during manufacturing of the display. Accordingly, as compared to a conventional organic light emitting display in which the touchscreen is attached to the organic light emitting display by an adhesive agent, the present invention does not require an adhesion process, thus simplifying the manufacturing process and reducing manufacturing costs. 
     In addition, the organic light emitting display with a touch sensor according to the present invention has a structure in which the color filter  192  is formed on the encapsulation layer  140  during manufacturing of the display. Thus, an embodiment of the present disclosure does not require a sealant to join a separate substrate on which the color filter  192  and touch sensor are disposed. This allows the display to be thinner. 
     In addition, the organic light emitting display with a touch sensor according to the second embodiment of the present disclosure can prevents=damage to the light emitting stack  124  through the touch buffer layer  166  interposed between the color filter  192  and the touch electrodes and can also reduce the capacitance of the parasitic capacitor formed by the cathode  126  and each of the touch electrodes  152   e  and  154   e.    
       FIG.  5    is a sectional view illustrating an organic light emitting display with a touch sensor according to a third embodiment of the present disclosure. 
     The organic light emitting display illustrated in  FIG.  5    includes the same elements as the organic light emitting display illustrated in  FIG.  4   , except that the color filter  192  is formed on the touch electrodes  152   e  and  154   e . Accordingly, detailed description of the same elements will be omitted. 
     The color filter  192  and the black matrix  194  illustrated in  FIG.  5    cover the touch sensor. That is, the touch sensing line  154  and the touch driving line  152  included in the touch sensor are disposed between the color filter  192  and the encapsulation layer  140 . In this case, the color filter  192  and the black matrix  194 , which are disposed higher than the touch sensor, absorb exterior light incident from the outside of the organic light emitting display to the inside thereof. That is, it is possible to prevent reflection of exterior light by conductive layers (for example, bridges  152   b  and  154   b , an anode  122 , a gate electrode  132 , and source and drain electrodes  136  and  138 ) formed using a metal with high reflectivity included in the touch sensor, the light emitting device  120  and the driving transistor  130 , and thus deterioration of visibility by exterior light. Accordingly, the organic light emitting display shown in  FIG.  5    can prevent deterioration of visibility due to exterior light even without an additional circular polarizer, and can thus reduce costs owing to removal of the circular polarizer. 
     In addition, the touch buffer layer  166  is formed on the substrate  111  provided with the color filter  192  and the black matrix  194 . The touch buffer layer  166  is formed using an organic insulating material such as an acrylic resin, an epoxy resin, polyimide, polyethylene or silicon oxycarbide (SiOC). The touch buffer layer  166  formed using the organic insulating material planarizes the substrate  111  provided with the color filter  192  and the black matrix  194 , thus improving adhesion of the barrier film  176  and the optical film  178  to the touch buffer layer  166 . 
     As such, the organic light emitting display with a touch sensor according to the third embodiment has a structure in which the touch electrodes  152   e  and  154   e  are directly disposed on the encapsulation layer  140 . Accordingly, as compared to a conventional organic light emitting display in which the touchscreen is attached to the organic light emitting display by an adhesive agent, an embodiment of the present disclosure does not require an adhesion process, thus simplifying the manufacturing process and reducing manufacturing costs. 
     Additionally, the organic light emitting display with a touch sensor according to the present disclosure absorbs exterior light through the color filter  192  and the black matrix  194  covering the light emitting device  120  and the touch sensor, thus preventing deterioration of visibility due to exterior light. 
       FIG.  6    is a sectional view illustrating an organic light emitting display with a touch sensor according to a fourth embodiment of the present disclosure. 
     The organic light emitting display illustrated in  FIG.  6    includes the same elements as the organic light emitting display illustrated in  FIG.  4   , except that at least one of the black matrix  194  and the color filter  192  is used as the touch insulation layer. Accordingly, detailed description of the same elements will be omitted. 
     The touch sensing line  154  and the touch driving line  152  of the organic light emitting display illustrated in  FIG.  6    intersect each other via at least one of the color filter  192  and the black matrix  194 . Accordingly, the first bridge  152   b  and the first touch electrode  152   e  of the touch driving line  152 , and the second touch electrode  154   e  of the touch sensing line  154  are formed on the sealing layer  140 , and the second bridge  154   b  is formed on the color filter  192  and the black matrix  194 . The second bridge  154   b  is electrically connected to the second touch electrode  154   e  exposed by the touch contact hole  150  passing through the black matrix  194 . As such, the first and second bridges  152   b  and  154   b  are insulated through the black matrix  194  without an additional touch insulation layer, thereby realizing a thin film, omitting the manufacturing process of the touch insulation layer, simplifying the overall process and reducing manufacturing costs. 
     Meanwhile, although  FIG.  6    illustrates an example in which the touch contact hole  140  passes through the black matrix  194 , the touch contact hole  150  may pass through the color filter  192 , or may pass through the color filter  192  and the black matrix  194  depending on the design specifications of the display. 
       FIG.  7    is a sectional view illustrating an organic light emitting display with a touch sensor according to a fifth embodiment of the present disclosure. 
     The organic light emitting display illustrated in  FIG.  7    includes the same elements as the organic light emitting display illustrated in  FIG.  6   , except that the touch barrier film  176  is omitted and a barrier thin film layer  160  is provided. Accordingly, detailed description of the same elements will be omitted. 
     The barrier thin film layer  160  is formed between the uppermost layer of the encapsulation layer  140  and the touch electrodes  152   e  and  154   e  (not shown), or between the light emitting device  120  and the lowermost layer of the encapsulation layer  140  (shown in  FIG.  7   ). For example, the barrier thin film layer  160  is formed between the cathode  126  and the first inorganic sealing layer  142  disposed as the lowermost layer of the encapsulation layer  140 . The barrier thin film layer  160  is formed as an inorganic layer that can be formed by atomic layer deposition (ALD) at a low temperature and is formed using an inorganic insulating material such as silicon nitride (SiN x ), silicon oxide (SiO x ), silicon oxynitride (SiON) or aluminum oxide (Al 2 O 3 ). Accordingly, the barrier thin film layer  160  prevents permeation of exterior moisture or oxygen into the light emitting device  120  vulnerable to exterior moisture or oxygen, thereby omitting an additional touch barrier film. In addition, the barrier thin film layer  160  is formed by low-temperature deposition, thus preventing damage to the light emitting stack  124 , which is vulnerable to high temperature. 
       FIGS.  8 A to  8 D  are sectional views illustrating a method of manufacturing organic light emitting displays with a touch sensor according to first to fifth embodiments of the present disclosure. Herein, the structure of the second embodiment according to the present disclosure illustrated in  FIG.  4    will be described as an example. 
     Referring to  FIG.  8 A , a routing line  156  and a pad electrode  172  are formed on a substrate  111  provided with a switching transistor, a driving transistor  130 , a light emitting device  120 , a encapsulation layer  140 , a black matrix  194 , a color filter  192  and a touch buffer layer  166 . 
     Specifically, the first conductive layer is deposited at room temperature by deposition using sputtering over the entire surface of the substrate  111  provided with the switching transistor, the driving transistor, the light emitting device  120 , the encapsulation layer  140 , the black matrix  194 , the color filter  192  and the touch buffer layer  166 , and the first conductive layer is then patterned by photolithography and etching to form the routing line  156  and the pad electrode  172 . Here, the first conductive layer is formed as a monolayer or multilayer structure using a metal with excellent corrosion resistance and acid resistance, such as Al, Ti, Cu, or Mo. For example, the first conductive layer is formed as a three-layer stack structure such as Ti/Al/Ti or Mo/Al/Mo. 
     Referring to  FIG.  8 B , first and second touch electrodes  152   e  and  154   e  and a first bridge  152   b  are formed on the substrate  111  provided with the routing line  156  and the pad electrode  172 . 
     Specifically, the second conductive layer is deposited over the entire surface of the substrate  111  provided with the routing line  156  and the pad electrode  172 . Here, in a case in which a transparent conductive layer, such as ITO or IZO, is used as the second conductive layer, the transparent conductive layer is formed at room temperature by deposition such as sputtering. Then, the second conductive layer is patterned by photolithography and etching to form first and second touch electrodes  152   e  and  154   e  and a first bridge  152   b.    
     Referring to  FIG.  8 C , a touch insulation layer  158  having a touch contact hole  150  is formed on the substrate  111  provided with the first and second touch electrodes  152   e  and  154   e , and the first bridge  152   b.    
     Specifically, a touch insulation layer  158  is formed to have a thickness of 500 Å to 5 μm on the substrate  111  provided with the first and second touch electrodes  152   e  and  154   e , and the first bridge  152   b . Here, in a case in which an organic layer is used as the touch insulation layer  158 , the organic layer is coated on the substrate and is then cured at a temperature of 100 degrees Celsius or less, to form a touch insulation layer  158 . In a case in which an inorganic layer is used as the touch insulation layer  158 , low-temperature CVD deposition and washing processes were repeated at least twice to form a touch insulation layer  158  with a multilayer structure. Then, the touch insulation layer  158  is patterned by photolithography and etching to form a touch contact hole  150 . 
     Referring to  FIG.  8 D , a second bridge  154   b  and a pad cover electrode  174  are formed on the substrate  111  provided with the touch insulation layer  158  having the touch contact hole  150 . 
     Specifically, a third conductive layer is formed on the substrate  111  provided with the touch insulation layer  158  having the touch contact hole  150 . Here, in a case in which a transparent conductive layer such as ITO or IZO, or a metal with excellent corrosion resistance and acid resistance such as Al, Ti, Cu or Mo is used as the third conductive layer, the third conductive layer is formed at room temperature by deposition such as sputtering. Then, the third conductive layer is patterned by photolithography and etching to form a second bridge  154   b  and a pad cover electrode  174 . Then, a touch barrier film  176  and an optical film  178  are attached to the substrate  111  provided with the second bridge  154   b  and the pad cover electrode  174 . 
       FIG.  9    is a plan view and a sectional view illustrating an organic light emitting display with a touch sensor according to a sixth embodiment of the present disclosure. 
     The organic light emitting display illustrated in  FIG.  9    includes the same elements as the organic light emitting display illustrated in  FIGS.  3  to  7   , except that configurations of the first and second touch electrodes  152   e  and  154   e  are changed. Accordingly, detailed description of the same elements will be omitted. 
     Some layers of the first and second touch electrodes  152   e  and  154   e  illustrated in  FIG.  9    may be formed to have a mesh shape. That is, the first and second touch electrodes  152   e  and  154   e  include a transparent conductive layer  1541 , and a mesh metal layer  1542  having a mesh shaped pattern. The mesh metal layer  1542  is on or under the transparent conductive layer  1541 . The mesh metal layer  1542  is formed by the same mask process as the routing line  156  using the same material as the routing line  156 . Accordingly, the mesh metal layer  1542  prevents complication of the manufacturing process and an increase in manufacturing costs. 
     In addition, the touch electrodes  152   e  and  154   e  may be composed of only the mesh metal layer  1542  without the transparent conductive layer  1541 , or may be formed of the transparent conductive layer  1541  in the form of a mesh without the mesh metal layer  1542 . Here, the mesh metal layer  1542  may include touch electrodes  152   e  and  154   e  as low-resistance electrodes due to better conductivity than the transparent conductive layer  1541 . In particular, when the transparent conductive layer  1541  is formed at a low temperature (about 100 degrees Celsius or less) in order to protect the light emitting stack  124 , which is vulnerable to high temperatures, the transparent conductive layer  1541  cannot obtain high transparency and low resistance. In this case, transmittance can be improved by forming the transparent conductive layer  1541  to have a small thickness while reducing resistance of the touch electrodes  152   e  and  154   e  through the mesh metal layer  1542 , which has high conductivity. 
     Accordingly, touch sensitivity can be improved due to decreased resistance and capacitance of touch electrodes  152   e  and  154   e  and thus reduced RC time constant. In addition, deterioration in opening ratio and transmittance resulting from very small line width of the mesh metal layer  1542  can be prevented. 
     In addition, as shown in  FIG.  9   , the bridge  154   b  disposed in a different plane from the touch electrodes  152   e  and  154   e  includes a plurality of slits  151 . Accordingly, the bridge  154   b  including the slits  151  is reduced in area as compared to bridge  154   b  including no slits  151 . Some of the slits  151  overlap with the bridge  152   b . Accordingly, it is possible to reduce reflection of exterior light due to the bridge  154   b  and thus prevent deterioration of visibility. The bridge  154   b  including the slits  151  is formed as a transparent conductive layer or a non-transparent conductive layer. When the bridge  154   b  is formed as a non-transparent conductive layer, the bridge  154   b  overlaps the bank  128 , thereby preventing deterioration in an opening ratio. 
     In  FIG.  9   , the display has a structure in which the bridge  154   b  and the second touch electrode  154   e  of the touch sensing line  154  are disposed in different planes and are connected through the touch contact hole  150 . In this case, the method of manufacturing the organic light emitting display having a touch sensor according to the present disclosure is as follows. The second bridge  154   b  is formed by a first mask process, the touch insulation layer having the touch contact hole  150  is formed by a second mask process, the routing line and the mesh metal layer are formed by a third mask process, and the first bridge  152   b , and the first and second touch electrodes  152   e  and  154   e  are formed by a fourth mask process. In other embodiments, the bridge  152   b  and the first touch electrode  152   e  of the touch driving line  152  may be disposed in different planes and be connected through the touch contact hole  150 . 
     As apparent from the afore-going, the organic light emitting display with a touch sensor according to an embodiment of the present disclosure has a structure in which touch electrodes are formed on the encapsulation layer. Accordingly, as compared to a conventional organic light emitting display in which the touchscreen is attached to the organic light emitting display by an adhesive agent, an embodiment of the present disclosure does not require a joining process, thus simplifying the manufacturing process, reducing manufacturing costs, making the display easier to fold, and improving resolution and opening ratio. 
     In addition, the organic light emitting display with a touch sensor according to an embodiment of the present disclosure has a structure in which color filters are formed on the encapsulation layer. Accordingly, an embodiment of the present disclosure does not require a joining process, thus simplifying the manufacturing process, reducing manufacturing costs, making the display easier to fold, and improving resolution and opening ratio. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure covers the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.