Patent Description:
The present disclosure relates to a display device including a touch sensor.

As the information-oriented society has been developed, there has been a growing need for various display devices for displaying an image. Recently, various types of display devices, such as a liquid crystal display (LCD) device, a plasma display panel (PDP) device, and an organic light emitting display (OLED) device, have been developed and utilized.

Among these display devices, the organic light emitting display device has received considerable attention recently due to its self-emitting property, high response speed, wide viewing angle, high contrast and improved color gamut, and being thinner.

In addition, the display devices can be operated by a user command input through various input devices, such as a keyboard, a mouse, or the like, and, as one of the input devices, a touch panel display device has been developed so that a user can intuitively and conveniently input a command by touching the screen of a display device with a special stylus or one or more fingers. A touch panel is disposed on the screen of the display device, and then a user can input a command to the display device by touching a certain point on the screen of the display device. Since the touch panel detects touch coordinates, it can be referred to as a touch sensing unit.

In addition, the display device includes a display area where an image is displayed and a bezel area that corresponds to an edge area of the display area. Recently, there has been an attempt to reduce the width of the bezel area for reasons such as design. However, in a case where the touch panel is mounted on the display device, since the number of signals for conveying the touch signal further increases, therefore, to output the touch signal to the outside, there are some limitations in reducing the width of the bezel area.

<CIT> claims the priority date of <NUM> August <NUM>. Its content as filed is therefore considered to be comprised in the state of the art relevant to the question of novelty, pursuant to Article <NUM>(<NUM>) EPC. <CIT> discloses an organic light emitting display having a touch sensor, which may achieve process simplification and cost reduction, and a method of fabricating the same. The organic light emitting display includes a compensation film having a flat surface and formed to cover dams forming a boundary with an organic encapsulation layer and the compensation film has a planarized surface between a region above the dams and a boundary region between the dams and the organic encapsulation layer and may prevent cut and short-circuit of routing lines cutting across the same. Further, touch sensors are disposed on an encapsulation unit including the organic encapsulation layer.

An invention is set out in the independent claim. The examples of the following disclosure that are not covered by the appended claims are by way of example only, and are useful for understanding the invention. It is one object of some embodiments of the present disclosure to provide a display device including a touch sensor.

It is another object of some embodiments of the present disclosure to provide a display device including a touch sensor capable of reducing a bezel area by reducing process deviation.

According to one aspect consistent with various embodiments of the present disclosure, provided is a display device including a substrate having a display area and a pad area applying a signal to the display area, a encapsulation layer disposed in the display area and including a first inorganic film, a second inorganic film disposed on the first inorganic film, and a first organic film disposed between the first inorganic film and the second inorganic film, a touch buffer layer disposed on the encapsulation layer, and a touch sensing unit disposed on the touch buffer layer, and including a touch sensor in which at least one inorganic film of the first inorganic film and the second inorganic film is disposed in a part of the pad area and a touch buffer layer is disposed on the at least one inorganic film.

According to some embodiments of the present disclosure, provided are a display device including a touch sensing unit capable of simplifying processes and reducing the manufacturing cost.

According to some embodiments of the present disclosure, provided are a display device including a touch sensing unit capable of reducing the size of the non-display area by reducing process margin deviation.

Hereinafter, the present preferred embodiments of the disclosure will be described in detail with reference to the accompanying drawings. In denoting elements of the drawings by reference numerals, the same elements will be referenced by the same reference numerals although the elements are illustrated in different drawings. In the following description of the disclosure, detailed description of known functions and configurations incorporated herein may be omitted when it may make the subject matter of the disclosure rather unclear.

Terms, such as first, second, A, B, (a), or (b) may be used herein to describe elements of the disclosure. Each of the terms is not used to define essence, order, sequence, or number of an element, but is used merely to distinguish the corresponding element from another element. When it is mentioned that an element is "connected" or "coupled" to another element, it should be interpreted that another element may be "interposed" between the elements or the elements may be "connected" or "coupled" to each other via another element as well as that one element is directly connected or coupled to another element.

<FIG> is a view illustrating a display device according to some embodiments of the present disclosure.

Referring to <FIG>, a display device <NUM> may include a display panel <NUM>, a touch sensing unit <NUM>, a display driver 14a, a touch driver 14b, and a controller <NUM>.

The display panel <NUM> may include a plurality of pixels P arranged in a matrix. Each pixel P may include an organic light emitting diode (OLED) and a pixel circuit supplying a driving current to the OLED. The pixel circuit may receive a data signal corresponding to a gate signal, generate a driving current, and supply the generated driving current to the OLED. In addition, the display panel <NUM> may be driven with a range of voltages. The range of voltages applied to the display panel <NUM> may include a first voltage EVDD and a second voltage EVSS having a lower level than the first voltage EVDD. The display panel <NUM> can be driven by the first voltage EVDD and the second voltage EVSS. The first voltage EVDD may be supplied for each pixel column and the second voltage EVSS may be a common voltage commonly supplied to a plurality of pixels P.

The touch sensing unit <NUM> may be disposed over the display panel <NUM> and can detect a touch from a finger or a stylus pen. In this case, the touch includes not only a direct touch, but approaching at certain intervals.

The display driver 14a may transmit the gate signal and the data signal to the display panel <NUM>. The display driver 14a may receive an image signal and then generate a data signal. In this case, a single display driver 14a is illustrated, but the present disclosure is not limited to this. The number of display drivers may be determined depending on the size or resolution of the display panel <NUM>. The display driver 14a may be implemented as an integrated circuit.

The touch driver 14b may transmit a touch driving signal to the touch sensing unit <NUM>, and receive a touch sensing signal in response to the touch driving signal. The touch driver 14b may be implemented as an integrated circuit.

The controller <NUM> may control individually the display driver 14a and the touch driver 14b. In addition, the controller <NUM> may supply an image signal to the display driver 14a.

<FIG> is a circuit diagram illustrating a pixel according to some embodiments of the present disclosure.

Referring to <FIG>, a pixel P may include a pixel circuit including an organic light emitting diode OLED, a first to third transistors T1 to T3, and a capacitor C1. In this case, the first transistor T1 may be a driving transistor supplying a drive current to the organic light emitting diode OLED.

The first transistor T1 may have a first touch electrode connected with a first voltage line VL1 through which the first voltage EVDD is applied, a second touch electrode connected with a second node N2, and a gate electrode connected with a first node N1. The second transistor T2 may have a first touch electrode connected with a data line DL, a second touch electrode connected with the first node N1, and a gate electrode connected with a gate line GL. The third transistor T3 may have a first touch electrode connected with the second node N2, a second touch electrode connected with a second voltage line VL2, and a third electrode connected with a sensing control signal line SEL. In this case, the sensing control signal line SEL may be a gate line GL. The organic light emitting diode OLED may have an anode electrode connected with the second node N2 and a cathode electrode to which the second voltage EVSS is applied. The cathode electrode may be connected to the second voltage line. Accordingly, a driving current supplied by the first transistor (T1) may flow through the organic light emitting diode OLED. In addition, the capacitor C1 may be connected between the first node N1 and the second node N2 and thus may maintain the voltage applied to the first node N1. The first voltage EVDD may be applied to the first voltage line VL1 and first reference voltage Vref may be applied to the second voltage line VL2.

<FIG> is a plan view illustrating a touch sensing unit according to some embodiments of the present disclosure.

Referring to <FIG>, a touch sensing unit is disposed over a display panel <NUM>, may include a plurality of first touch electrodes TEa and a plurality of second touch electrodes TEb. The plurality of first touch electrodes TEa may correspond to one or more touch driving electrodes TEa and the plurality of second touch electrodes TEb may correspond to one or more touch sensing electrodes TEb. The plurality of first touch electrodes TEa may be connected to each other through a bridge <NUM> in a row direction and form a plurality of electrode rows. The plurality of second touch electrodes TEb may be connected to each other through the bridge <NUM> in a column direction and form a plurality of electrode columns. In this case, the plurality of first touch electrodes TEa and the plurality of second touch electrodes TEb may be arranged in a 4x3 matrix, but the present disclosure is not limited thereto. The touch insulating film <NUM> may comprise a touch contact hole through which the second touch electrode <NUM> may contact the bridge <NUM> on the touch buffer layer <NUM>. The touch buffer layer <NUM> and the touch insulating film <NUM> may extend to the pad area <NUM>.

One or more touch driving signals may be applied to first touch electrodes Tea and one or more touch driving signals corresponding to the touch driving signals may be applied to the second touch electrodes TEb. The first touch electrodes TEa and the second touch electrodes TEb may be disposed in the same layer over the display panel <NUM>, but the present disclosure is not limited thereto.

A bridge <NUM> may connect a first touch electrode TEa to one or more other first touch electrodes. A bridge <NUM> may also connect a second touch electrode TEb to one or more other second touch electrodes. To prevent direct connections between the first touch electrodes TEa and the second touch electrodes TEb, resulting from intersecting of the bridges with each other, a bridge <NUM> connecting the first touch electrodes TEa may be arranged in a different layer from the first touch electrodes TEa and the second touch electrodes TEb, and the bridge <NUM> may be connected to the first touch electrodes TEa through one or more vias. A bridge <NUM> connecting the second touch electrodes TEb may be arranged in the same layer as one or more first touch electrodes TEa and one or more second touch electrodes TEb, and be connected to the second touch electrodes TEb in the same layer. Accordingly, an insulating film may be arranged between a bridge <NUM> connecting the first touch electrodes TEa and a bridge <NUM> connecting the second touch electrodes TEb.

In addition, the first touch electrode TEa and the second touch electrode TEb may be formed by the patterning of a conductive metal layer. In addition, the first touch electrode TEa and the second touch electrode TEb may be formed of a transparent material such as indium tin oxide ITO. In addition, the patterned first touch electrode TEa and the second touch electrode TEb and the bridges <NUM> may have an electrode pattern formed in a mesh, and the first touch electrode TEa and the second touch electrode TEb may have a plurality of openings. Since the first touch electrode TEa and the second touch electrode TEb are formed of an ITO electrode or have openings, light emitted from the display device may be transmitted by the first touch electrode TEa and the second touch electrode TEb or emit out through the plurality of openings.

The patterns of the first touch electrode TEa and the second touch electrode TEb and the bridges <NUM> formed in a mesh may be referred to as touch electrode wiring. The first touch electrode TEa and the second touch electrode TEb may be connected to a touch driving line 321a, 321b enabling a driving signal to be applied to a touch electrode, and a touch sensing line 321c conveying a sensing signal generated in response to a touch event detected through the touch electrode. The touch sensing line 321c is provided on a side surface of an encapsulation layer <NUM>, <NUM>, <NUM>. The touch driving line 321a, 321b may be provided on a side surface of a touch buffer layer <NUM> or touch insulating film <NUM>.

Referring to <FIG>, a touch sensing unit is disposed on a display panel, and a plurality of touch electrodes TE having a predetermined area may be arranged in a matrix on the display panel <NUM>. In addition, a plurality of touch lines <NUM> may be connected to each touch electrode TE to receive touch sensing signals therefrom. The touch line <NUM> may be disposed in a lower portion of the touch electrode and may contact an area of the touch electrode TE. Since the touch electrode TE and the touch line <NUM> may be arranged inside the display panel <NUM>, it is possible to provide the display device in a manner where a separate touch panel is not included on the display panel <NUM>, and therefore a thinner display panel <NUM> can be provided.

<FIG> are sectional views illustrating a manufacturing procedure.

Referring to <FIG>, a substrate has a display area <NUM> and a pad area <NUM>, and a thin film transistor, a gate line applying a gate signal to the thin film transistor, a data line applying a data signal to the thin film transistor are formed over the display area <NUM>. The substrate <NUM> may include polyamide, but the present disclosure is not limited thereto. In addition, when the data line is formed on the substrate <NUM>, the source electrode and the drain electrode 111b of the thin film transistor and a signal line 111a extending from the pad area <NUM> towards the display area <NUM> may be formed at the same time. The signal line 111a extends from the display area <NUM> to the pad area <NUM>. The pad area comprises a touch pad <NUM>. The signal line 111a is exposed in the pad area <NUM> and therefore may serve as a pad for connecting to an external device. But, the present disclosure is not limited thereto. In addition, an external device that is connected to the touch pad <NUM> may be a data driver, a gate driver, or the like. In addition, the external device may be a printed circuit board PCB on which the data and gate drivers can be mounted. But, the present disclosure is not limited thereto.

A planarization film <NUM> may be disposed on the drain electrode 111b. Then, the planarization film <NUM> is patterned, and an anode electrode <NUM> and a drain electrode 111b are formed to be connected to each other. A bank 114b may be formed on the anode electrode <NUM>, and an organic light emitting film 114a may be formed in a cavity formed in the bank 114b. A cathode electrode <NUM> is formed on the bank 114b in which the organic light emitting film 114a is formed. The bank 114b in which the organic light emitting film 114a is formed may be referred to as a light emitting layer. The cathode electrode <NUM> may be a common electrode. A first inorganic film <NUM> is formed on the cathode electrode <NUM>. When the first inorganic film <NUM> is formed, a dam 112a may be formed over a portion at which the pad area <NUM> and the display area <NUM> are adjacent to each other. The dam 112a may be formed when the planarization film <NUM> is formed. The dam 112a may have a dual structure such as being composed of two layers or peaks. In addition, when the first inorganic film <NUM> is formed, the first inorganic film <NUM> may be formed not to cover the pad area <NUM>, the film being formed by any patterning technique using a mask. The first inorganic film <NUM> may cover an upper part of the dam 112a. But, the present disclosure is not limited thereto. In addition, a display area <NUM> and a pad area <NUM> may be defined relative to the dam 112a on the substrate <NUM>. However, the present disclosure is not limited thereto, and pad area <NUM> may be an area in which a signal line 111a disposed on the substrate is exposed or an area in which a conductor disposed on the signal line 111a is exposed. The conductor disposed on the signal line 111a may be a second touch electrode <NUM> illustrated in <FIG>.

Referring to <FIG>, a first organic film <NUM> is formed on a first inorganic film <NUM>. In order to protect an organic light emitting film 114a, a thick layer may be disposed on the organic light emitting film 114a to prevent foreign substances such as moisture from penetrating the organic light emitting film 114a. However, there are some limitations to increase the thickness of the first inorganic film <NUM>. Accordingly, in order to protect an organic light emitting film 114a, the first organic film <NUM>, of which the thickness can be increased, is disposed on the first inorganic film <NUM>. The dam 112a serves to prevent the first organic film <NUM> from penetrating into the pad area <NUM>.

Referring to <FIG>, a second inorganic film <NUM> is formed on the first organic film <NUM>. The second inorganic film <NUM> may cover the upper portion of the dam 112a formed by the first inorganic film <NUM>. When the first inorganic film <NUM> is formed, it is patterned using a mask, but the second inorganic film <NUM> may be formed without using a mask. The deposited first inorganic film <NUM>, first organic film <NUM> and second inorganic film <NUM> are referred to as an encapsulation layer.

Referring to <FIG>, a touch buffer layer <NUM> is formed on the second inorganic film <NUM>. The touch sensing unit can be mounted on the encapsulation layer by the patterning of a touch electrode, and the encapsulation layer may be damaged while the touch electrode is formed. To solve this problem, the touch buffer layer <NUM> is formed on the encapsulation layer. The touch buffer layer may be formed without using a mask. The touch buffer layer <NUM> may be formed with an inorganic film. The touch buffer layer <NUM> serves to prevent the substrate from being damaged, but is not limited to preventing formation of a defect while the touch electrode is formed.

Referring to <FIG>, a first touch electrode <NUM> and a second touch electrode <NUM> are formed on the touch buffer layer <NUM>. The first touch electrode <NUM> may be a bridge <NUM>, as illustrated in <FIG>, and the second touch electrode <NUM> may be a plurality of first touch electrodes TEa and/or a plurality of second touch electrodes TEb, as illustrated in <FIG>. The bridge <NUM> may be disposed on a layer different from the plurality of first touch electrodes TEa and the plurality of second touch electrodes TEb. A touch insulating film <NUM> is disposed between the first touch electrode <NUM> and the second touch electrode <NUM>. A protective layer <NUM> may be formed on the second touch electrode <NUM>. The first touch electrode <NUM> may be the touch electrode TE illustrated in <FIG> and the second touch electrode <NUM> may be the touch line <NUM> illustrated in <FIG>.

A first touch electrode <NUM> may be formed first on the touch buffer layer <NUM>. When the first touch electrode <NUM> is formed, the first touch electrode <NUM> may be patterned using a mask, or when the first touch electrode <NUM> is formed, the touch buffer layer <NUM> and the second inorganic film <NUM>, which are disposed under the first touch electrode <NUM>, may be patterned. Accordingly, when the first touch electrode <NUM> is formed, the touch buffer layer <NUM> and the second inorganic film <NUM> are patterned and one mask may be used because a separate patterning is not required. At this time, in a case where the first inorganic film <NUM> has not been patterned in previous process, the first inorganic film <NUM> may be also patterned when the first touch electrode <NUM> is formed. Accordingly, the manufacturing process of the display device <NUM> can be simplified and the cost can be reduced. At this time, the second inorganic film <NUM> and the touch buffer layer <NUM> which are formed in the pad area <NUM> are removed and as a result a signal line may be exposed. In addition, since the second inorganic film <NUM> and the touch buffer layer <NUM> can be patterned using a single mask, a margin in the mask process can be set small. That is, if two mask processes are performed, a margin of each mask process is required to be set, but, if a single mask process is performed, a margin of the single mask process is required to be set, and thereby it is possible to set a smaller margin than performing a mask process twice. As a result, the area of the display area on the substrate <NUM> can be increased and the area of the pad area can be reduced. Thus, a bezel area can be designed smaller.

After the first touch electrode <NUM> has been patterned, the touch insulating film <NUM> is deposited, and, after the touch insulating film <NUM> has been deposited, the second touch electrode <NUM> may be formed on the touch insulating film <NUM> by patterning. At this time, the second touch electrode <NUM> is formed on a signal line 111a exposed in the pad area. In addition, the signal line 111a contacts the second touch electrode <NUM>. As a result, a signal is conveyed to the second touch electrode <NUM> through the signal line 111a. As a protective layer <NUM> is disposed on the second touch electrode <NUM>, the second touch electrode <NUM> can be protected. The protective layer <NUM> may be an organic film or an inorganic film. The touch sensing line 321c is provided on a side surface of the encapsulation layer <NUM>, <NUM>, <NUM>. The touch driving line 321a, 321b may be provided on a side surface of the touch buffer layer <NUM> or touch insulating film <NUM>. The touch pad <NUM> comprises upper and lower pad electrodes. The signal line 111a is the lower pad electrode. The second touch electrode <NUM> is the upper pad electrode. The lower pad electrode/signal line 111a may be the same material as the source electrode and drain electrode 111b. The upper pad electrode may be made of the same material as the touch driving line 321a or the touch sensing line 321c.

<FIG> are sectional views illustrating a manufacturing procedure of a pad area and a display area adjacent to the pad area in a display device.

Referring to <FIG>, a first inorganic film <NUM> may be formed on a substrate having a display area <NUM> and a pad area <NUM>. A first organic film <NUM> may be disposed on the first inorganic film <NUM>. The first organic film <NUM> may be disposed only on the display area <NUM>. A second inorganic film <NUM> may be formed on the first organic film <NUM>. At this time, since a mask is not used, the second inorganic film <NUM> is not patterned, and therefore the second inorganic film <NUM> may be formed both the display area <NUM> and the pad area <NUM>. A touch buffer layer <NUM> may be formed on the second inorganic film <NUM>.

Referring to <FIG>, after the touch buffer layer <NUM> has been formed, a first touch electrode <NUM> may be formed on the touch buffer layer <NUM>. The first touch electrode <NUM> may be formed using a mask.

Referring to <FIG>, after the first touch electrode <NUM> has been formed, a touch insulating film <NUM> may be formed on the first touch electrode <NUM>. The touch insulating film <NUM> located on the pad area <NUM> may be etched. The touch insulating film <NUM> may be an inorganic film, and when the touch insulating film <NUM> is etched, since the first inorganic film <NUM> and the second inorganic film <NUM>, which are located under the touch insulating film <NUM>, may be etched together, thus the pad area <NUM> can be exposed. The exposing of the pad area <NUM> may cause a signal line located in the pad area <NUM> to be exposed.

However, even though the touch insulating film <NUM> is etched, the first inorganic film <NUM> and/or at least a part of the second inorganic film <NUM> may remain in the pad area <NUM>, as illustrated in <FIG>. Accordingly, as illustrated in <FIG>, while patterning is performed to form a second touch electrode <NUM> on the touch insulating film <NUM>, the first inorganic film <NUM> and/or the second inorganic film <NUM> which remains in the pad area <NUM> may be removed. As such, a signal line may be exposed in the pad area <NUM>. A protective layer <NUM> may be further formed on the second touch electrode <NUM>. The first inorganic film <NUM>, second inorganic film <NUM>, and touch buffer layer <NUM> may be deposited in sequence over an outer edge of the area with the exposed signal line, of the pad area <NUM>.

<FIG> is a flowchart illustrating a method of manufacturing a display device.

Referring to <FIG>, according to a method of manufacturing the display device, a display area and a pad area may be formed on a substrate. A thin film transistor, a light emitting layer including an organic light emitting film contacting at least a part of the thin film transistor, and a cathode electrode formed on the light emitting layer may be formed on the substrate S1500. One or more pixels including the thin film transistor and one or more signal lines may be formed in the display area and the pad area respectively. In addition, a dam may be formed in the display area adjacent to the pad area. The dam may have a dual structure such as being composed of two layers or peaks. The dam may be formed using a planarization film disposed under the light emitting layer. But, the present disclosure is not limited thereto.

A first inorganic film may be disposed on a cathode electrode and then patterned S1510. The first inorganic film may be deposited on the dam.

A first organic film may be disposed on the first inorganic film S1520. The thickness of the first organic film may be over a predetermined value, and therefore foreign substances can be prevented from penetrating the light emitting layer. In addition, the dam serves to prevent the first organic film from penetrating into the pad area. The dam serves as a reference to define the display area and the pad area. However, the present disclosure is not limited thereto, and pad area <NUM> may be an area in which a signal line 111a disposed on the substrate is exposed or an area in which a conductor disposed on the signal line 111a is exposed. The conductor disposed on the signal line 111a may be a second touch electrode <NUM> described below.

A second inorganic film may be disposed on the first organic film S1530. Since the second inorganic film is not patterned, it may be disposed on the first organic film without using a mask. Accordingly, a process for patterning the second inorganic film may be omitted. The first inorganic film, first organic film and second inorganic film may be referred to as a encapsulation layer.

A touch buffer layer may be formed on the second inorganic film S1540. The first inorganic film, first organic film and second inorganic film may be damaged by heat, and, in a case where a touch sensing unit including a touch electrode is disposed on the second inorganic film, a process for patterning the touch electrode, or the like may be required. The first inorganic film, first organic film and second inorganic film may be damaged by a process for patterning the touch electrode. To solve this problem, the forming of the touch buffer layer may serve to prevent the first inorganic film, first organic film and second inorganic film, which are formed in earlier processes, from being damaged.

A touch electrode on the touch buffer layer may be patterned S1550. The touch buffer layer and the second inorganic film may be patterned when the touch electrode is formed. Accordingly, the number of required mask processes may be reduced, when the touch buffer layer and the second inorganic film are removed in the pad area by the etching of the touch buffer layer and the second inorganic film using a single mask. If the number of mask processes is reduced to one, a process margin can be set smaller when one mask process is performed than when two mask processes are performed, and therefore the size of the pad area on the substrate can be reduced. In a case where the first inorganic film is disposed in the pad area without the first inorganic film patterned, in the step S1520, the first inorganic film may be etched along with the touch buffer layer and the second inorganic film when they are etched.

In addition, the patterning of the touch electrode may cause the touch buffer layer and the second inorganic film in the pad area to be patterned and removed when a first touch electrode is patterned, among at least two touch electrodes. In addition, the patterning of the touch electrode may cause the touch buffer layer and the second inorganic film to be patterned and removed when the touch insulating film is removed by etching in the pad area. In addition, the patterning of the touch electrode may cause the touch buffer layer and the second inorganic film in the pad area to be patterned and removed when a second touch electrode on the touch insulating film is patterned.

Claim 1:
A display device (<NUM>) comprising:
a substrate (<NUM>) having a display area (<NUM>) and a pad area (<NUM>);
the display area (<NUM>) comprising
a thin film transistor on the substrate (<NUM>) including a source electrode and a drain electrode (111b);
an anode electrode (<NUM>) connected to the drain electrode (111b);
an organic light emitting film (114a) on the anode electrode (<NUM>); and
a cathode electrode (<NUM>) on the organic light emitting film (114a);
an encapsulation layer disposed on the display area (<NUM>) including a first inorganic film (<NUM>), a first organic film (<NUM>) on the first inorganic film (<NUM>), and a second inorganic film (<NUM>) on the first organic film (<NUM>);
a touch buffer layer (<NUM>) on the second inorganic film (<NUM>) of the encapsulation layer;
a first touch electrode (<NUM>) and a second touch electrode (<NUM>) on the touch buffer layer (<NUM>);
a touch insulating film (<NUM>) disposed between the first touch electrode (<NUM>) and the second touch electrode (<NUM>);
a touch driving line (321a, 321b) disposed on the touch insulating film (<NUM>) and connected to the first touch electrode (<NUM>);
a touch pad (<NUM>) in the pad area (<NUM>) including an upper pad electrode and a lower pad electrode, wherein the lower pad electrode is a signal line (111a) which extends from the display area (<NUM>) to the pad area (<NUM>) and the upper pad electrode is the second touch electrode (<NUM>) in contact with the signal line (111a);
wherein the second touch electrode (<NUM>) is connected to a touch sensing line (321c), and the touch sensing line (321c) is provided on a side surface of the encapsulation layer.