Transparent display device with touch sensor

Abstract

To provide a transparent display device capable of minimizing loss of light transmittance by a touch sensor or a touch line.SOLUTION: A transparent display device having a touch sensor includes: a board having a transmission area and a non-transmission area; multiple sub-pixels that are provided in the non-transmission area, and include a light-emitting element made of an anode electrode, a light-emitting layer, and a cathode electrode; a touch sensor including a touch sensor electrode while being disposed in the transmission area; and undercut structure for separating the cathode electrode forming the light-emitting element and the touch sensor electrode forming the touch sensor. The undercut structure includes: multiple inorganic films including an opening area overlapping with an edge area of the touch sensor electrode; and an organic pattern that is provided on the multiple inorganic films and is disposed while being separated from the multiple sub-pixels.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a transparent display device equipped with a touch sensor. [Background technology]

[0002] In recent years, active research has been conducted into transparent display devices that allow users to see objects or images on the opposite side through the display device. Transparent display devices have a display area where an image is displayed that includes a transmissive area that allows external light to pass through and a non-transmissive area, and the transmissive area allows the display area to have high light transmittance.

[0003] A transparent display device may include multiple touch sensors and multiple touch lines to implement a touch function. However, in a transparent display device, it is not easy to form multiple touch sensors and multiple touch lines, or the process is complicated, and the multiple touch sensors and multiple touch lines may reduce light transmittance. Furthermore, in a transparent display device, electrodes for displaying images, multiple drive lines, and multiple touch sensors and multiple touch lines for touching are arranged in a small area, and may affect each other. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE INVENTION It is a technical object of the present invention to provide a transparent display device that can minimize loss of light transmittance due to touch sensors and touch lines.

[0005] Another technical object of the present invention is to provide a transparent display device that can prevent short-circuit defects from occurring in the undercut region.

[0006] Another technical object of the present invention is to provide a transparent display device that can prevent moisture that penetrates through the undercut region from being transferred to the light emitting element.

[0007] Another technical object of the present invention is to provide a transparent display device that can ensure high touch performance. [Means for solving the problem]

[0008] A transparent display device having a touch sensor according to an embodiment of the present invention includes a substrate having a transmissive region and a non-transmissive region, a plurality of sub-pixels each including a light-emitting element formed in the non-transmissive region and each including an anode electrode, a light-emitting layer, and a cathode electrode, a touch sensor disposed in the transmissive region and including a touch sensor electrode, and an undercut structure separating the cathode electrode constituting the light-emitting element from the touch sensor electrode constituting the touch sensor. The undercut structure includes a plurality of inorganic films each including an opening region overlapping an edge region of the touch sensor electrode, and an organic pattern disposed on the plurality of inorganic films and spaced apart from the plurality of sub-pixels.

[0009] A transparent display device having a touch sensor according to another embodiment of the present invention includes a substrate having a transmissive region and a non-transmissive region, a plurality of sub-pixels in the non-transmissive region, each sub-pixel including a light-emitting element having an anode electrode, a light-emitting layer, and a cathode electrode, a touch sensor disposed in the transmissive region, each sub-pixel including a touch sensor electrode, and a plurality of undercut structures separating the cathode electrode constituting the light-emitting element and the touch sensor electrode constituting the touch sensor. [Effects of the Invention]

[0010] The present invention simplifies the touch process by simultaneously forming the touch sensor electrode of the touch sensor and the cathode electrode of the light emitting element using an undercut structure, and does not require the addition of a separate mask for the touch sensor electrode, thereby enabling process optimization and reducing production energy.

[0011] Furthermore, the present invention can form the first undercut structure without loss of light transmittance by forming the first undercut structure using an organic pattern made of a transparent material and a plurality of inorganic films.

[0012] In addition, the present invention can be configured so that the planarization film provided in the non-transmitting region does not overlap with the opening regions of the inorganic films, thereby preventing moisture from penetrating the underside of the planarization film and further preventing moisture (H2O) contained in the filler from being transferred to the light emitting element.

[0013] In addition, the present invention separates the organic pattern having an undercut structure from the planarization film provided to overlap a plurality of sub-pixels, so that even if moisture contained in the filler penetrates the organic pattern, it may not be transmitted to the light-emitting element.

[0014] Furthermore, the present invention can reduce the rate of short-circuit defects between the cathode electrode of the light-emitting element and the touch sensor electrode of the touch sensor by providing a plurality of undercuts in the first undercut structure.

[0015] In addition, the present invention can prevent or minimize the occurrence of parasitic capacitance between the touch sensor and the light emitting element by providing a dummy touch sensor electrode between the touch sensor and the light emitting element.

[0016] In addition, the present invention reduces parasitic capacitance affecting the touch sensor, thereby improving the noise-to-touch signal ratio and ghost touch defects, thereby improving the touch recognition rate. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a plan view schematically showing a transparent display panel. [Figure 2] FIG. 2 is a diagram schematically illustrating an embodiment of a pixel provided in region A of FIG. 1; [Figure 3] 3 is a diagram for explaining an example of signal lines, touch lines, and touch sensors provided in region B of FIG. 2. FIG. [Figure 4] 10 is a diagram illustrating a connection relationship between a plurality of touch blocks and a plurality of touch lines; [Figure 5] 10 is a diagram illustrating the connection relationship between a plurality of touch lines and a plurality of touch sensors within one touch block. FIG. [Figure 6] FIG. 4 is a cross-sectional view showing an example of II' in FIG. [Figure 7] 4 is a plan view showing a first example of the touch sensor and a first undercut structure shown in FIG. 3. FIG. [Figure 8] FIG. 8 is a cross-sectional view showing a first example of II-II' in FIG. [Figure 9] 10A and 10B are diagrams illustrating an example in which moisture penetrates into a lower region of an undercut structure. [Figure 10] 4 is a plan view showing a second example of the touch sensor and first undercut structure shown in FIG. 3. FIG. [Figure 11] FIG. 11 is a cross-sectional view showing an example of III-III' in FIG. [Figure 12] 10A and 10B are diagrams illustrating an example in which a foreign object is inserted into an undercut structure. [Figure 13] 4 is a plan view showing a third embodiment of the touch sensor and undercut structure shown in FIG. 3. FIG. [Figure 14] FIG. 14 is a cross-sectional view showing an example of VI-VI′ in FIG. [Figure 15] FIG. 10 is a plan view showing an example of a configuration in which dummy touch sensor electrodes are connected to a common power supply pixel line. [Figure 16] FIG. 16 is a cross-sectional view showing an example of VV' in FIG. [Figure 17] 4 is a plan view showing a fourth embodiment of the touch sensor and undercut structure shown in FIG. 3. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] The advantages and features of the present invention, and methods for achieving them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various different forms. The embodiments are provided solely to ensure that the disclosure of the present invention is complete and to fully convey the scope of the invention to those skilled in the art.

[0019] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for illustrating the embodiments of this specification are illustrative only, and the specification is not limited to the details shown in the drawings. Furthermore, in describing this specification, if a specific description of related publicly known technology is deemed to unnecessarily obscure the gist of this specification, the detailed description will be omitted. When terms such as "comprise," "have," and "consist of" are used in this specification, other parts may be added unless "only" is used. When a component is expressed in the singular, the plural is also included unless otherwise explicitly stated.

[0020] When describing a location relationship, for example, when the location relationship between two parts is described using "above," "at the top," "below," "next to," etc., one or more other parts may be located between the two parts, unless "immediately" or "directly" is used.

[0021] Although terms such as "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, a "first" component referred to below may also be a "second" component within the technical spirit of the present invention.

[0022] The term "at least one" should be understood to include all possible combinations of one or more of the associated items. For example, "at least one of the first, second, and third items" can mean not only the first, second, or third item, but also all possible combinations of items that can be presented from two or more of the first, second, and third items.

[0023] The features of the embodiments of the present invention can be partially or fully combined or combined with each other, and various technical interlocking and driving mechanisms are possible, and each embodiment can be implemented independently of each other or can be implemented together in a linked relationship. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0024] 1 is a plan view schematically illustrating a transparent display panel, in which the X axis indicates a direction parallel to the scan lines, the Y axis indicates a direction parallel to the data lines, and the Z axis indicates a height direction of the transparent display device 100.

[0025] 1, a transparent display device 100 according to an embodiment of the present invention includes a transparent display panel 110. The transparent display panel 110 according to an embodiment of the present invention can be divided into a display area (DA) where pixels are formed to display an image, and a non-display area (NDA) where no image is displayed.

[0026] The display area (DA) may include a first signal line (SL1), a second signal line (SL2) and pixels, and the non-display area (NDA) may include a pad area (PA) where pads are arranged and at least one gate driver 205.

[0027] The first signal line (SL1) may extend in a first direction (e.g., the Y-axis direction) and may intersect with the second signal line (SL2) in the display area (DA). The second signal line (SL2) may extend in a second direction (e.g., the X-axis direction) in the display area (DA). Pixels are provided in the area where the first signal line (SL1) is provided or in the area where the first signal line (SL1) and the second signal line (SL2) intersect, and emit predetermined light to display an image.

[0028] The gate driver 205 is connected to the scan lines to supply scan signals. The gate driver 205 may be formed in a non-display area (NDA) on one or both sides of the display area (DA) of the transparent display panel 110 using a gate driver in panel (GIP) method or a tape automated bonding (TAB) method.

[0029] In order to implement a touch function, the transparent display panel 110 may further include touch lines and touch sensors in addition to the first signal lines SL1, the second signal lines SL2, and the pixels. The touch lines and touch sensors will be described in detail below with reference to FIGS. 2 to 9.

[0030] FIG. 2 is a diagram illustrating an example of a pixel provided in region A of FIG. 1, and FIG. 3 is a diagram illustrating an example of a signal line, a touch line, and a touch sensor provided in region B of FIG. 2.

[0031] 2 and 3, the display area (DA) includes a transmissive area (TA) and a non-transmissive area (NTA), as shown in FIG. 2. The transmissive area (TA) is an area that transmits most of the light incident from the outside, and the non-transmissive area (NTA) is an area that does not transmit most of the light incident from the outside. For example, the transmissive area (TA) may be an area with a light transmittance greater than α%, and the non-transmissive area (NTA) may be an area with a light transmittance less than β%, where α is a value greater than β. The transparent display panel 110 allows objects or background located behind the transparent display panel 110 to be seen through the transmissive area (TA).

[0032] The non-transmissive area (NTA) may include a first non-transmissive area (NTA1), a second non-transmissive area (NTA2), and a pixel (P). The pixel (P) is provided in the first non-transmissive area (NTA1) or an intersection area where the first non-transmissive area (NTA1) and the second non-transmissive area (NTA2) intersect, and emits light to display an image. The light-emitting area (EA) may correspond to a region of the pixel (P) that emits light.

[0033] Each of the pixels (P) can include a first sub-pixel (SP1), a second sub-pixel (SP2), a third sub-pixel (SP3), and a fourth sub-pixel (SP4), as shown in Figure 2. The first sub-pixel (SP1) includes a first light-emitting region (EA1) that emits a first color light, and the second sub-pixel (SP2) includes a second light-emitting region (EA2) that emits a second color light. The third sub-pixel (SP3) includes a third light-emitting region (EA3) that emits a third color light, and the fourth sub-pixel (SP4) includes a fourth light-emitting region (EA4) that emits a fourth color light.

[0034] For example, the first to fourth light-emitting regions (EA1, EA2, EA3, EA4) can emit light of different colors. For example, the first light-emitting region (EA1) can emit green light, the second light-emitting region (EA2) can emit red light, the third light-emitting region (EA3) can emit blue light, and the fourth light-emitting region (EA4) can emit white light. However, this is not necessarily limited to this. In addition, the arrangement order of the sub-pixels (SP1, SP2, SP3, SP4) can be changed in various ways.

[0035] The first non-transmissive area (NTA1) may extend from the display area (DA) in a first direction (e.g., the Y-axis direction) and may be arranged to at least partially overlap the light-emitting areas (EA1, EA2, EA3, EA4). The transparent display panel 110 may be provided with a plurality of first non-transmissive areas (NTA1), and a transmissive area (TA) may be provided between two adjacent first non-transmissive areas (NTA1). First signal lines (SL1) extending in the first direction (e.g., the Y-axis direction) may be arranged spaced apart from each other in the first non-transmissive areas (NTA1).

[0036] The first signal line (SL1) may include, for example, at least one of a pixel power line (VDDL), a common power line (VSSL), a reference line (RL), and a data line (DL).

[0037] The pixel power line (VDDL) can supply an anode power supply to each of the drive transistors (DTR) of the sub-pixels (SP1, SP2, SP3, SP4) provided in the display area (DA).

[0038] The common power supply line (VSSL) may supply cathode power to the cathode electrodes of the sub-pixels (SP1, SP2, SP3, SP4) provided in the display area (DA). Here, the cathode power may be a common power supply commonly supplied to the sub-pixels (SP1, SP2, SP3, SP4).

[0039] Specifically, the common power supply line (VSSL) may supply cathode power to the cathode electrode via the cathode contact electrode (CCT). The cathode contact electrode (CCT) may be provided between the transmissive area (TA) and the common power supply line (VSSL), and a power supply connecting line (VCL) may be disposed between the common power supply line (VSSL) and the cathode contact electrode (CCT). One end of the power supply connecting line (VCL) may be connected to the common power supply line (VSSL) and the other end may be connected to the cathode contact electrode (CCT). The cathode electrode may be connected to the cathode contact electrode (CCT). As a result, the cathode electrode may be electrically connected to the common power supply line (VSSL) via the power supply connecting line (VCL) and the cathode contact electrode (CCT). In one embodiment, the common power supply line (VSSL), the power supply connecting line (VCL), and the cathode contact electrode (CCT) may be integrally formed on one layer, but this is not necessarily limited to this. In another embodiment, the common power supply line (VSSL), the power supply connection line (VCL), and the cathode contact electrode (CCT) may be provided in different layers and electrically connected to each other through contact holes.

[0040] The reference line (RL) may supply an initialization voltage (or a reference voltage) to each of the drive transistors (DTR) of the sub-pixels (SP1, SP2, SP3, and SP4) included in the display area (DA). The reference line (RL) may be disposed between the plurality of data lines (DL1, DL2, DL3, and DL4). For example, the reference line (RL) may be disposed between the second data line (DL2) and the third data line (DL3) of the plurality of data lines (DL1, DL2, DL3, and DL4).

[0041] The reference line (RL) may branch and be connected to the plurality of sub-pixels (SP1, SP2, SP3, SP4). Specifically, the reference line (RL) may be connected to the circuit elements of the plurality of sub-pixels (SP1, SP2, SP3, SP4) and may supply an initialization voltage (or reference voltage) to each of the sub-pixels (SP1, SP2, SP3, SP4).

[0042] Each of the data lines (DL) can supply a data voltage to each of the sub-pixels (SP1, SP2, SP3, SP4). For example, one data line (DL) can supply a first data voltage to the first drive transistor of the first sub-pixel (SP1), another data line (DL) can supply a second data voltage to the second drive transistor of the second sub-pixel (SP2), another data line (DL) can supply a third data voltage to the third drive transistor of the third sub-pixel (SP3), and another data line (DL) can supply a fourth data voltage to the fourth drive transistor of the fourth sub-pixel (SP4).

[0043] The first signal line (SL1) may further include a touch line (TL). The transparent display panel 110 according to an embodiment of the present invention may further include a touch line (TL) in the first non-transmissive area (NTA1). At least two touch lines (TL) may be provided in one first non-transmissive area (NTA1). In the transparent display panel 110, if multiple touch lines (TL) are provided in the transmissive area (TA), the multiple touch lines (TL) may reduce light transmittance.

[0044] In addition, slits, specifically elongated lines or rectangles, may be formed between the touch lines (TL). When external light passes through the slits, diffraction may occur. Diffraction occurs when light, which is a plane wave, is transformed into a spherical wave by passing through the slits, and interference may occur in the spherical wave. Therefore, constructive interference and destructive interference occur in the spherical wave, causing the external light passing through the slits to have irregular light intensity. This may reduce the clarity of objects or images located on the opposite side of the transparent display panel 110. For this reason, it is preferable to arrange the touch lines (TL) in the first non-transmissive area (NTA1) rather than the transmissive area (TA).

[0045] In the first non-transparent area (NTA1), multiple touch lines (TL) can be arranged between the circuit areas (CA1, CA2, CA3, CA4) in which circuit elements are arranged and the transparent area (TA) as shown in FIG. 3 . As an example, four touch lines (TL) can be arranged in one first non-transparent area (NTA1). In this case, two touch lines (TL) can be arranged between the circuit areas (CA1, CA2, CA3, CA4) and the transparent area (TA) arranged on the right side of the circuit areas (CA1, CA2, CA3, CA4). The other two touch lines (TL) can be arranged between the circuit areas (CA1, CA2, CA3, CA4) and the transparent area (TA) arranged on the left side of the circuit areas (CA1, CA2, CA3, CA4). However, this configuration is not necessarily limited to this. The multiple touch lines (TL) can be arranged in various orders as long as they do not overlap with the circuit areas (CA1, CA2, CA3, CA4) in which circuit elements are arranged.

[0046] The transparent display panel 110 according to an embodiment of the present invention includes pixels (P) between adjacent transmissive areas (TA), and the pixels (P) may include light-emitting areas (EA1, EA2, EA3, EA4) in which light-emitting elements are arranged to emit light. Since the non-transmissive area (NTA) of the transparent display panel 110 is small in area, circuit elements may be arranged to overlap the light-emitting areas (EA1, EA2, EA3, EA4).

[0047] The transparent display panel 110 according to an embodiment of the present invention can minimize the parasitic capacitance of the touch lines (TL) due to the circuit elements by preventing the touch lines (TL) from overlapping with the circuit regions (CA1, CA2, CA3, CA4). Furthermore, the transparent display panel 110 according to an embodiment of the present invention can improve the uniformity of the parasitic capacitance by reducing the horizontal distance difference of the touch lines (TL).

[0048] The second non-transmissive area (NTA2) can be arranged to extend from the display area (DA) in a second direction (e.g., the X-axis direction) and overlap at least partially with the light-emitting areas (EA1, EA2, EA3, EA4) as shown in FIG. 3. The transparent display panel 110 can be provided with a plurality of second non-transmissive areas (NTA2), and a transmissive area (TA) can be provided between two adjacent second non-transmissive areas (NTA2). A second signal line (SL2) can be arranged in such a second non-transmissive area (NTA2).

[0049] The second signal line (SL2) extends in a second direction (e.g., the X-axis direction) and may include, for example, a scan line (SCANL), which may supply a scan signal to the sub-pixels (SP1, SP2, SP3, SP4) of the pixel (P).

[0050] The second signal line (SL2) may further include a touch bridge line (TBL). The touch bridge line (TBL) may connect any one of the plurality of touch lines (TL) to the touch sensor (TS). The touch bridge line (TBL) may be connected to any one of the plurality of touch lines (TL) through the first contact hole (CH1). The touch bridge line (TBL) may extend in a second direction (e.g., the X-axis direction) and be connected to at least two or more touch sensors (TS) arranged in the second direction (e.g., the X-axis direction).

[0051] In accordance with an embodiment of the present invention, a transparent display panel 110 can prevent a decrease in light transmittance due to the plurality of touch lines (TL) by disposing the plurality of touch lines (TL) in the first non-transmissive area (NTA1) rather than in the second non-transmissive area (NTA2). The second non-transmissive area (NTA2) extending in a second direction (e.g., the X-axis direction) crosses between adjacent transmissive areas (TA) as shown in FIG. 3. If the width of the second non-transmissive area (NTA2) crossing the transmissive area (TA) increases, the area of ​​the transmissive area (TA) decreases. If a plurality of touch lines (TL) are disposed in the second non-transmissive area (NTA2), the width of the second non-transmissive area (NTA2) increases due to the large number of lines disposed therein, and the area of ​​the transmissive area (TA) decreases. In other words, a problem of a decrease in light transmittance due to the plurality of touch lines (TL) can occur.

[0052] The transparent display panel 110 according to an embodiment of the present invention may have a plurality of touch lines (TL) disposed in the first non-transmissive area (NTA1) and only one touch bridge line (TBL) for connecting the plurality of touch sensors TS in the second non-transmissive area (NTA2). As a result, the transparent display panel 110 according to an embodiment of the present invention can minimize reductions in the area of ​​the transmissive area (TA) and reductions in light transmittance due to the plurality of touch lines (TL) and touch bridge line (TBL).

[0053] The transmissive areas (TA) may include touch sensors (TS). The touch sensors (TS) are arranged in each of the transmissive areas (TA), and a change in capacitance may occur when a user touches them. A touch driver (not shown) is connected to the touch sensors (TS) via touch lines (TL) and can detect changes in capacitance of the touch sensors (TS). The touch sensors (TS) may correspond one-to-one to the pixels (P).

[0054] Hereinafter, the connection relationships between the touch sensors TS, the touch lines TL, and the touch bridge lines TBL will be described in more detail with reference to FIGS.

[0055] FIG. 4 is a diagram illustrating the connection relationship between a plurality of touch blocks and a plurality of touch lines, and FIG. 5 is a diagram illustrating the connection relationship between a plurality of touch lines and a plurality of touch sensors within one touch block.

[0056] 4 and 5, a transparent display panel 110 according to an embodiment of the present invention may include a plurality of touch blocks (TB). Each of the plurality of touch blocks (TB) is a basic unit for determining a user's touch position, and may include a plurality of pixels (P) and a plurality of touch sensors (TS) provided in a plurality of transmissive areas (TA) arranged in one-to-one correspondence with the plurality of pixels (P). For example, each of the plurality of touch blocks (TB) may include 12×20 pixels (P) and 12×20 touch sensors (TS). In this case, if the image resolution is 1920×960, the touch resolution may be 160×48.

[0057] In the transparent display panel 110 according to an embodiment of the present invention, each of the plurality of touch lines (TL) is connected to only one of the plurality of touch blocks (TB) and can sense a change in capacitance of the touch sensor (TS) connected to the connected touch block (TB). That is, the plurality of touch lines (TL) provided in the transparent display panel 110 can correspond one-to-one to the plurality of touch blocks (TB). Therefore, the same number of touch lines (TL) as the number of touch blocks (TB) can be arranged in the transparent display panel 110. For example, if the number of touch blocks (TB) is 160×48, the number of touch lines (TL) can also be 160×48 and can be connected to the touch driver (TIC).

[0058] As described above, in order to form the same number of touch lines (TL) as the number of touch blocks (TB), at least two touch lines (TL) must be formed in one first non-transmissive area (NTA1). For example, if the image resolution is 1920x960 and the touch resolution is 160x48, in order to form 160x48 touch lines (TL) on the transparent display panel 110, one first non-transmissive area (NTA1) may be provided with four touch lines (TL) as shown in FIG. 3.

[0059] Meanwhile, as shown in FIG. 5, a plurality of touch sensors (TS) included in one touch block (TB) may be connected to one of a plurality of touch lines (TL) included in one touch block (TB). For example, one touch block (TB) may include 12 first non-transmissive areas (NTAs), and four touch lines (TL) may be arranged in each of the 12 first non-transmissive areas (NTAs). As a result, one touch block (TB) may include 48 touch lines (TL1, ..., TL48). In this case, a plurality of touch sensors (TS) included in one touch block (TB) may be connected to one specific touch line (TL) among the 48 touch lines (TL1, ..., TL48). Here, a specific touch line (TL) may be connected to a plurality of touch sensors (TS) arranged in a second direction (e.g., the X-axis direction) via a touch bridge line (TBL) extending in the second direction (e.g., the X-axis direction). As a result, a plurality of touch sensors (TS) included in one touch block (TB) can be electrically connected via a specific touch line (TL) and a plurality of touch bridge lines (TBL).

[0060] Each of the touch lines (TL) may correspond one-to-one to a touch block (TB). Therefore, the touch blocks (TB) may be electrically isolated from one another because they are connected to different touch lines (TL). Each touch line (TL) may connect the touch sensors (TS) included in the corresponding touch block (TB) to the touch driver (TIC). Specifically, each touch line (TL) may transmit a change in capacitance provided by the touch sensor (TS) included in the touch block (TB) to the touch driver (TIC). The touch driver (TIC) may detect the change in capacitance and determine the location of a user's touch. Additionally, each touch line (TL) may provide a sensing voltage generated by the touch driver (TIC) to the touch sensor (TS) included in the touch block (TB).

[0061] Hereinafter, the light emitting elements in the light emitting area (EA), the touch sensor (TS) in the transmissive area (TA), and the undercut structure will be described in more detail with reference to FIGS.

[0062] FIG. 6 is a cross-sectional view showing an example of I-I' in FIG. 3, FIG. 7 is a plan view showing a first embodiment of the touch sensor and first undercut structure shown in FIG. 3, FIG. 8 is a cross-sectional view showing a first example of II-II' in FIG. 7, and FIG. 9 is a diagram for explaining an example of moisture penetrating into the lower region of the undercut structure.

[0063] 3 and 6 to 8, a first substrate 111 of a transparent display panel 110 according to an embodiment of the present invention may include a plurality of transmissive areas (TAs) and non-transmissive areas (NTAs) including a plurality of emissive areas (EAs) disposed between adjacent transmissive areas (TAs). The non-transmissive areas (NTAs) may include a first non-transmissive area (NTA1) extending in a first direction (e.g., the Y-axis direction) and a second non-transmissive area (NTA2) extending in a second direction (e.g., the X-axis direction).

[0064] The first non-transmissive region (NTA1) may include circuit regions (CA1, CA2, CA3, CA4) in which at least one transistor and capacitor are arranged. The first non-transmissive region (NTA1) may include pixel power lines (VDDL), common power lines (VSSL), reference lines (RL), data lines (DL), touch lines (TL), and sensing lines (SSL) extending in a first direction (e.g., the Y-axis direction) and arranged so as not to overlap with the circuit regions (CA1, CA2, CA3, CA4). The second non-transmissive region (NTA2) may include scan lines (SCANL) and touch bridge lines (TBL) extending in a second direction (e.g., the X-axis direction).

[0065] The at least one transistor may include a drive transistor (DTR) and a switching transistor, which is switched by a scan signal supplied to a scan line (SCANL) to charge a capacitor with a data voltage supplied from a data line (DL).

[0066] The drive transistor (DTR) is switched by the data voltage charged in the capacitor, and generates a data current from a power source supplied from the pixel power line (VDDL) and supplies the data current to the first electrode layer 120 of the sub-pixels (SP1, SP2, SP3, SP4). The drive transistor (DTR) may include an active layer (ACT), a gate electrode (GE), a source electrode (SE), and a drain electrode (DE).

[0067] Specifically, as shown in Fig. 6, a light-shielding layer (LS) may be provided on the first substrate 111. The light-shielding layer (LS) may serve to block external light from entering the active layer (ACT) in the region where the drive transistor (DTR) is formed. The light-shielding layer (LS) may be formed of a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0068] In the transparent display panel 110 according to an embodiment of the present invention, at least some of the pixel power supply line (VDDL), the common power supply line (VSSL), the reference line (RL), the data line (DL), the touch line (TL), and the touch bridge line (TBL) may be formed in the same layer as the light blocking layer (LS). In one example, the reference line (RL), the touch line (TL), and the touch bridge line (TBL) may be formed in the same layer as the light blocking layer (LS) and from the same material, but this is not necessarily limited to this.

[0069] A buffer film (BF) may be provided on the light-shielding layer (LS). The buffer film (BF) is for protecting the drive transistor (DTR) from moisture that may penetrate through the first substrate 111, which is susceptible to moisture permeation, and may be formed of an inorganic film, such as a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer film thereof.

[0070] An active layer (ACT) of the drive transistor (DTR) may be provided on the buffer film (BF). The active layer (ACT) may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. For example, the active layer (ACT) of the drive transistor (DTR) may be made of indium gallium zinc oxide (IGZO). In one embodiment, the active layer (ACT) may be formed as a double layer. In this case, the active layer (ACT) may be made of a first layer made of a silicon-based semiconductor material or an oxide-based semiconductor material and a second layer made of ITO or IZO. For example, the active layer (ACT) of the drive transistor (DTR) may include a first layer made of indium gallium zinc oxide (IGZO) and a second layer made of IZO.

[0071] A gate insulating film (GI) may be provided on the active layer (ACT) of the drive transistor (DTR). The gate insulating film (GI) may be patterned only in the region where the gate electrode (GE) is to be disposed. The gate insulating film (GI) may be formed of an inorganic film, such as a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer film thereof.

[0072] A gate electrode (GE) of the drive transistor (DTR) may be provided on the gate insulating film (GI). The gate electrode (GE) may be formed of a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0073] An interlayer insulating film (ILD) may be provided on the gate electrode (GE) of the drive transistor (DTR). The interlayer insulating film (ILD) may be provided in the non-transparent region (NTA) and the transparent region (TA). However, as shown in FIGS. 7 and 8, the interlayer insulating film (ILD) may not be provided in at least a portion of the transparent region (TA) to form a first undercut structure (UC1) in the transparent region (TA), and a first opening region (OA1) exposing the buffer film (BF) may be formed. The interlayer insulating film (ILD) may be formed of an inorganic film, such as a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer film thereof.

[0074] The source electrode (SE) and drain electrode (DE) of the drive transistor (DTR) may be provided on the interlayer insulating film (ILD). The source electrode (SE) and drain electrode (DE) of the drive transistor (DTR) may be connected to the active layer (ACT) of the drive transistor (DTR) through a fourth contact hole (CH4) penetrating the interlayer insulating film (ILD). The source electrode (SE) and drain electrode (DE) may be formed of a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0075] In the transparent display panel 110 according to an embodiment of the present invention, at least some of the pixel power line (VDDL), the common power line (VSSL), the reference line (RL), the data line (DL), the touch line (TL), and the touch bridge line (TBL) may be formed in the same layer as the source electrode (SE) and the drain electrode (DE) of the drive transistor (DTR). In one example, the data line (DL) may be formed in the same layer as the source electrode (SE) and the drain electrode (DE) using the same material, but is not limited thereto.

[0076] A first passivation film (PAS1) for insulating the drive transistor (DTR) may be provided on the source electrode (SE) and drain electrode (DE) of the drive transistor (DTR), and a second passivation film (PAS2) may be provided on the first passivation film (PAS1).

[0077] The first and second passivation films (PAS1, PAS2) may be provided in the non-transmissive area (NTA) and the transmissive area (TA). However, as shown in FIGS. 7 and 8, the first and second passivation films (PAS1, PAS2) may not be provided in at least a portion of the transmissive area (TA) to form a first undercut structure (UC1) in the transmissive area (TA), thereby forming a first opening area (OA1) that exposes the buffer film (BF). The first opening area (OA1) of the first and second passivation films (PAS1, PAS2) may overlap the first opening area (OA1) of the interlayer dielectric film (ILD).

[0078] Such first and second passivation films (PAS1, PAS2) can be formed of an inorganic film, such as a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer film thereof.

[0079] A separate metal layer may be formed between the first and second passivation films (PAS1, PAS2). At least some of the pixel power line (VDDL), common power line (VSSL), reference line (RL), data line (DL), touch line (TL), touch bridge line (TBL), and sensing line (SSL) may be formed on the metal layer. For example, the pixel power line (VDDL) and the common power line (VSSL) may be formed between the first and second passivation films (PAS1, PAS2). Here, each of the pixel power line (VDDL) and the common power line (VSSL) may be configured to overlap some of the touch lines (TL). For example, the pixel power line (VDDL) may overlap some of the touch lines (TL) to save space and increase the size of the transmissive area (TA). The pixel power supply lines (VDDL) may be provided to overlap with two first touch lines (TL) arranged between the circuit areas (CA1, CA2, CA3, CA4) and the transparent areas (TA) arranged on the right side of the circuit areas (CA1, CA2, CA3, CA4). The common power supply line (VSSL) may be provided to overlap with two second touch lines (TL) arranged between the circuit areas (CA1, CA2, CA3, CA4) and the transparent areas (TA) arranged on the left side of the circuit areas (CA1, CA2, CA3, CA4).

[0080] The metal layer may be formed of a single layer or multiple layers of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), ITO, and IZO, or an alloy thereof. For example, the metal layer may be formed of an alloy of molybdenum (Mo) and titanium (Ti), or a laminated structure of an alloy of molybdenum (Mo), titanium (Ti), and ITO.

[0081] A planarization layer (PLN) for planarizing steps due to the drive transistors (DTR) and a plurality of signal lines may be provided on the second passivation layer (PAS2). The planarization layer (PLN) may be provided in the non-transmissive area (NTA) and may not be provided in at least a portion of the transmissive area (TA). The planarization layer (PLN) may cause light refraction as light passes through it, thereby reducing transparency. Therefore, in the transparent display panel 110 according to an embodiment of the present invention, transparency can be improved by removing a portion of the planarization layer (PLN) in the transmissive area (TA). For example, the transmissive area (TA) may have fewer layers.

[0082] The planarization film (PLN) may be provided so as not to overlap the first opening region (OA1) of the plurality of inorganic films. The planarization film (PLN) may be provided on the plurality of inorganic films provided in the non-transparent region (NTA), and the entire lower surface may be in contact with the upper surface of the uppermost inorganic film among the plurality of inorganic films. For example, the planarization film (PLN) may be provided on the interlayer insulating film (ILD), first passivation film (PAS1), and second passivation film (PAS2) provided in the non-transparent region (NTA), and the entire lower surface may be in contact with the upper surface of the second passivation film (PAS2). In other words, a portion of the lower surface of the planarization film (PLN) may not be exposed in the first opening region (OA1) of the plurality of inorganic films.

[0083] As shown in FIG. 9, the planarization film (PLN) may be formed so that a portion of its lower surface is exposed in the opening regions of the inorganic films. In this case, the lower surface of the planarization film (PLN) may contact the filler 150 in the opening regions of the inorganic films. Here, the filler 150 may contain moisture (H2O), and the moisture (H2O) contained in the filler 150 may permeate the lower surface of the planarization film (PLN) that is in contact with the filler 150. Because the planarization film (PLN) is in contact with the light-emitting elements of the subpixels (SP1, SP2, SP3, SP4), the moisture (H2O) that permeates the planarization film (PNL) may be transferred to the light-emitting elements. This may cause deterioration of the light-emitting elements, resulting in a fade-out phenomenon in which brightness is reduced.

[0084] In a transparent display panel 110 according to one embodiment of the present invention, the planarization film (PLN) is arranged so as not to overlap with the first opening region (OA1) of the interlayer insulating film (ILD), the first passivation film (PAS1), and the second passivation film (PAS2), thereby preventing moisture (H2O) from penetrating into the planarization film (PLN) and further preventing the moisture (H2O) contained in the filler 150 from being transmitted to the light-emitting element.

[0085] Such a planarizing film (PLN) can be formed from an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0086] The transparent display panel 110 according to an embodiment of the present invention may form a first undercut structure UC1 using an organic pattern OP and a plurality of inorganic insulating films.

[0087] Specifically, the first undercut structure (UC1) may include a plurality of inorganic layers including a first organic pattern (OP1) and a first opening region (OA1). The first organic pattern (OP1) may be formed in the same layer and made of the same material as the planarization layer (PLN). Here, the first organic pattern (OP1) may be disposed separately from the planarization layer (PLN) provided in the non-transmitting region (NTA). However, this is not necessarily limited thereto. The first organic pattern (OP1) may also be formed in a different layer and made of a different material than the planarization layer (PLN). The plurality of inorganic layers may be first and second passivation layers (PAS1, PAS2) and an interlayer insulating film (ILD).

[0088] The first organic pattern (OP1) may be formed on a plurality of inorganic films provided in an area overlapping the touch sensor (TS). For example, the first organic pattern (OP1) may have a dome shape or a tapered shape based on the substrate, but is not limited thereto. The first organic pattern (OP1) may also be formed as a barrier extending along the periphery of the touch sensor (TS). The first opening region (OA1) of the plurality of inorganic films may have a planar closed shape along the edge region of the touch sensor (TS), as shown in FIG. 7. For example, the first opening region (OA1) of the plurality of inorganic films may have a planar rectangular shape, but is not limited thereto. Therefore, the plurality of inorganic films provided in an area overlapping the touch sensor (TS) may be separated from the plurality of inorganic films provided in an area overlapping the plurality of subpixels (SP1, SP2, SP3, SP4) by the first opening region (OA1).

[0089] The first organic pattern (OP1) may be provided on a plurality of inorganic films provided in an area overlapping the touch sensor (TS) and may be spaced apart from a plurality of inorganic films provided in an area overlapping the plurality of subpixels (SP1, SP2, SP3, SP4). The first organic pattern (OP1) may be provided on a portion of the upper surfaces of the plurality of inorganic films provided in an area overlapping the touch sensor (TS). The first organic pattern (OP1) may have a first width (W1) on the upper surfaces of the plurality of inorganic films provided in an area overlapping the touch sensor (TS) and may be formed along the edge region of the touch sensor (TS), as shown in FIG. 7. The first organic pattern (OP1) may be a ring pattern having a planar closed shape. For example, the first organic pattern (OP1) may be a planar rectangular ring pattern.

[0090] The first organic pattern (OP1) may at least partially overlap with a first opening region (OA1) of the plurality of inorganic films. The first undercut structure (UC1) may include a first undercut (UC11) formed in a region where the first organic pattern (OP1) overlaps with at least a portion of the first opening region (OA1). The first undercut structure (UC1) may protrude from a plurality of inorganic films provided in a region where the first organic pattern (OP1) overlaps with the touch sensor (TS) in the first opening region (OA1), thereby forming the first undercut (UC11).

[0091] In the first undercut (UC11), the first organic pattern (OP1) may protrude toward the sub-pixels (SP1, SP2, SP3, SP4) beyond the inorganic films provided in the area overlapping with the touch sensor (TS). Thus, the first undercut structure (UC1) exposes at least a portion of the lower surface of the first organic pattern (OP1) in the first opening region (OA1), and no inorganic films are provided under the exposed lower surface, forming a separation space with the buffer film (BF).

[0092] Such a first undercut structure (UC1) may be provided within the transmissive area (TA). More specifically, the first undercut structure (UC1) may be provided in an edge region of the touch sensor (TS) or between the touch sensor (TS) and the non-transmissive area (NTA). In one example, the first undercut structure (UC1) may be formed along the edge region of the transmissive area (TA). Furthermore, the first undercut structure (UC1) may have a planar closed shape. In one example, the first undercut structure (UC1) may have a planar rectangular shape.

[0093] The transparent display panel 110 according to one embodiment of the present invention forms a first undercut structure (UC1) using a first organic pattern (OP1) made of a transparent material and a plurality of inorganic films, thereby preventing a decrease in light transmittance due to the first undercut structure (UC1).

[0094] A first electrode layer 120, an organic light-emitting layer 130, a second electrode layer 140, and a bank 125 may be provided on the planarization film (PLN).

[0095] The first electrode layer 120 may be provided on the planarization layer (PLN) for each sub-pixel (SP1, SP2, SP3, SP4). The first electrode layer 120 is not provided in the transmissive region (TA). The first electrode layer 120 may be connected to the driving transistor (DTR). Specifically, the first electrode layer 120 may be connected to one of the source electrode (SE) and the drain electrode (DE) of the driving transistor (DTR) through a contact hole (not shown) that penetrates the planarization layer (PLN) and the first and second passivation layers (PAS1, PAS2).

[0096] The first electrode layer 120 may be formed of a metal material with high reflectivity, such as a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, a stacked structure of Ag alloy and ITO (ITO / Ag alloy / ITO), a MoTi alloy, or a stacked structure of MoTi alloy and ITO (ITO / MoTi alloy / ITO). The Ag alloy may be an alloy of silver (Ag), palladium (Pd), copper (Cu), etc. The MoTi alloy may be an alloy of molybdenum (Mo) and titanium (Ti). Such a first electrode layer 120 may be an anode electrode of a light emitting device.

[0097] The bank 125 may be provided on a planarization film (PLN). The bank 125 may be formed to cover the edge of the first electrode layer 120 and expose a portion of the first electrode layer 120. Thus, the bank 125 may prevent current from concentrating at the edge of the first electrode layer 120, which may result in a decrease in light-emitting efficiency.

[0098] The bank 125 may define light-emitting areas (EA1, EA2, EA3, EA4) of the sub-pixels (SP1, SP2, SP3, SP4), respectively. The light-emitting areas (EA1, EA2, EA3, EA4) of the sub-pixels (SP1, SP2, SP3, SP4) are formed by sequentially stacking the first electrode layer 120, the organic light-emitting layer 130, and the cathode electrode CE. The light-emitting areas (EA1, EA2, EA3, EA4) of the sub-pixels (SP1, SP2, SP3, SP4) are regions where holes from the first electrode layer 120 and electrons from the cathode electrode CE combine in the organic light-emitting layer 130 to emit light. In this case, the region where the bank 125 is formed does not emit light and thus becomes a non-light-emitting area (NEA), while the region where the bank 125 is not formed and the first electrode layer 120 is exposed becomes a light-emitting area (EA). The bank 125 may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0099] The organic light-emitting layer 130 may be provided on the first electrode layer 120. The organic light-emitting layer 130 may include a hole transport layer, an emission layer, and an electron transport layer. In this case, when a voltage is applied to the first electrode layer 120 and the cathode electrode (CE), holes and electrons move to the emission layer via the hole transport layer and the electron transport layer, respectively, and combine with each other in the emission layer to emit light.

[0100] In one embodiment, the organic light-emitting layer 130 may be a common layer formed in common to the sub-pixels (SP1, SP2, SP3, and SP4), where the light-emitting layer may be a white light-emitting layer that emits white light.

[0101] In another embodiment, the organic light emitting layer 130 may have light emitting layers formed separately for each sub-pixel (SP1, SP2, SP3, SP4). For example, a green light emitting layer that emits green light may be formed in the first sub-pixel (SP1), a red light emitting layer that emits red light may be formed in the second sub-pixel (SP2), a blue light emitting layer that emits blue light may be formed in the third sub-pixel (SP3), and a white light emitting layer that emits white light may be formed in the fourth sub-pixel (SP4). In this case, the light emitting layer of the organic light emitting layer 130 is not formed in the transmissive region (TA).

[0102] The organic light-emitting layer 130 may be separated, rather than being continuous, between the non-transmissive area (NTA) and the transmissive area (TA) by the first undercut structure (UC1). Specifically, the organic light-emitting layer 130 may separate the organic light-emitting layer 131 provided in the non-transmissive area (NTA) and the organic light-emitting layer 133 provided in the transmissive area (TA) by the first undercut structure (UC1). That is, the organic light-emitting layer 130 may separate the organic light-emitting layer 131 provided in the non-transmissive area (NTA) and the organic light-emitting layer 133 provided in the transmissive area (TA) from each other by the first undercut structure (UC1).

[0103] The second electrode layer 140 may be provided on the organic light-emitting layer 130 and the bank 125. When the second electrode layer 140 is deposited over the entire surface, the second electrode layer 140 may be discontinuous between the non-transmissive area (NTA) and the transmissive area (TA) by the first undercut structure (UC1). Specifically, the second electrode layer 140 may be separated into a second electrode (CE) provided in the non-transmissive area (NTA) and a second electrode (TSE) provided in the transmissive area (TA) by the first undercut structure (UC1).

[0104] Here, the second electrode (CE, hereinafter referred to as "cathode electrode") provided in the non-transmitting area (NTA) may be configured as a cathode electrode to form a light-emitting element. The cathode electrode (CE) is connected to the cathode contact electrode (CCT) and can receive power from the common power line (VSSL). The cathode electrode (CE) may be a common layer formed in common to the sub-pixels (SP1, SP2, SP3, SP4) to apply the same voltage.

[0105] In addition, the second electrode (TSE, hereinafter referred to as "touch sensor electrode") provided in the transmissive area (TA) may be configured to form a touch sensor (TS) as a touch sensor electrode. The touch sensor electrode (TSE) may be formed on the second passivation film (PAS2) and the first organic pattern (OP1) provided in the transmissive area (TA). The touch sensor electrode (TSE) may overlap at least a portion of the first opening area (OA1) of the plurality of inorganic films in the edge area.

[0106] The touch sensor electrode (TSE) can be connected to the touch contact electrode (TCT) and provide a capacitance change to the touch line (TL). Specifically, the touch sensor (TS) can be coupled to the touch line (TL) through the touch contact electrode (TCT) and the touch bridge line (TBL).

[0107] The touch bridge lines (TBL) may connect the touch contact electrodes (TCT) and the touch lines (TL). As shown in FIG. 3, the touch bridge lines (TBL) may include a first touch bridge line (TBL1), a second touch bridge line (TBL2), and a third touch bridge line (TBL3).

[0108] The first touch bridge line (TBL1) may be disposed in an area where the first non-transmissive area (NTA1) and the second non-transmissive area (NTA2) intersect, and may extend in a second direction (e.g., the X-axis direction). One end of the first touch bridge line (TBL1) may be connected to one of the second touch bridge lines (TBL2) through one second contact hole (CH2), and the other end may be connected to another of the second touch bridge lines (TBL2) through a third contact hole (CH3). The first touch bridge line (TBL1) may be connected to one of the plurality of touch lines (TL) through the first contact hole (CH1).

[0109] The first touch bridge line (TBL1) may be arranged in a layer different from the first signal line (SL1) extending in a first direction (e.g., the Y-axis direction) in the first non-transmitting area (NTA1). The first touch bridge line (TBL1) may be arranged in the same layer as at least one of the light-shielding layer (LS), the active layer (ACT), the gate electrode (GE), the source electrode (SE), and the drain electrode (DE) of the drive transistor (DTR). For example, the first touch bridge line (TBL1) may be arranged in the same layer as the gate electrode (GE) of the drive transistor (DTR).

[0110] The second touch bridge line (TBL2) may be provided in a second non-transmissive area (NTA2) disposed between the transmissive areas (TA). The second touch bridge line (TBL2) may be electrically connected to the first touch bridge line (TBL1) and extend in a second direction (e.g., the X-axis direction). Specifically, one end of the second touch bridge line (TBL2) may be connected to one first touch bridge line (TBL1) through one second contact hole (CH2), and the other end may be connected to another first touch bridge line (TBL1) through a third contact hole (CH3).

[0111] The second touch bridge line (TBL2) may be disposed in the same layer as at least one of the light-shielding layer (LS), the active layer (ACT), the gate electrode (GE), the source electrode (SE), and the drain electrode (DE) of the drive transistor (DTR). For example, the second touch bridge line (TBL2) may be disposed in the same layer as the light-shielding layer (LS).

[0112] The third touch bridge line (TBL3) may electrically connect the touch contact electrode (TCT) and the second touch bridge line (TBL2). The third touch bridge line (TBL3) may protrude from one side of the second touch bridge line (TBL2) and extend to an area overlapping with the touch sensor (TS). One end of the third touch bridge line (TBL3) may be connected to the touch contact electrode (TCT).

[0113] The third touch bridge line (TBL3) may be formed in a layer provided between the first substrate 111 and the drive transistor (DTR). In one embodiment, the third touch bridge line (TBL3) may be formed in the same layer and made of the same material as the light-shielding layer (LS). The third touch bridge line (TBL3) may extend across the first undercut structure (UC1). The first undercut structure (UC1) may be formed through a wet etching process. In the transparent display panel 110 according to one embodiment of the present invention, the third touch bridge line (TBL3) may be formed in the same layer as the light-shielding layer (LS) to prevent the third touch bridge line (TBL3) from being washed away during the wet etching process for forming the first undercut structure (UC1).

[0114] The third touch bridge line (TBL3) may be formed in the same layer as the second touch bridge line (TBL2), but is not necessarily limited to this. The third touch bridge line (TBL3) may also be formed in a layer different from the second touch bridge line (TBL2). However, even in this case, it may be preferable to form the third touch bridge line (TBL3) in a layer provided between the first substrate 111 and the driving transistor (DTR).

[0115] The touch contact electrode (TCT) may be provided in the transmissive area (TA). The touch contact electrode (TCT) may be disposed between the third touch bridge line (TBL3) and the touch sensor electrode (TSE) and may electrically connect the third touch bridge line (TBL3) and the touch sensor electrode (TSE). The touch contact electrode (TCT) may be connected to the third touch bridge line (TBL3) through a contact hole.

[0116] Furthermore, at least a portion of the upper surface of the touch contact electrode (TCT) is exposed by a second undercut structure (not shown), and the touch sensor electrode (TSE) can be connected to the exposed upper surface. Specifically, the touch contact electrode (TCT) can be formed in a layer provided between the buffer film (BF) and the second passivation film (PAS2). In one embodiment, the touch contact electrode (TCT) can be provided between the interlayer insulating film (ILD) and the first passivation film (PAS1). That is, the touch contact electrode (TCT) can be provided in the same layer as the source electrode (SE) and drain electrode (DE) of the drive transistor (DTR).

[0117] In this case, the first and second passivation films (PAS1, PAS2) may have opening regions (not shown) that expose at least a portion of the upper surface of the touch contact electrode (TCT). As a result, the touch contact electrode (TCT) can be electrically connected to the touch sensor electrode (TSE) by connecting the touch sensor electrode (TSE) to the exposed upper surface. As a result, the touch sensor electrode (TSE) can be electrically connected to the touch line (TL) via the touch contact electrode (TCT) and the touch bridge line (TBL).

[0118] The second electrode layer 140 including the cathode electrode (CE) and the touch sensor electrode (TSE) may be formed of a transparent metal material (TCO, Transparent Conductive Material) such as ITO or IZO that can transmit light, or a semi-transmissive metal material (TCO, Semi-Transmissive Conductive Material) such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). When the second electrode layer 140 is formed of a semi-transmissive metal material, microcavities may be formed to increase light output efficiency.

[0119] An encapsulation film (not shown) may be provided on the light emitting element and the touch sensor (TS). The encapsulation film (not shown) may be formed on the cathode electrode (CE) and the touch sensor electrode (TSE) to cover the cathode electrode (CE) and the touch sensor electrode (TSE). The encapsulation film (not shown) serves to prevent oxygen or moisture from penetrating into the organic light emitting layer 130, the cathode electrode (CE), and the touch sensor electrode (TSE). To this end, the encapsulation film (not shown) may include at least one inorganic film and at least one organic film.

[0120] A color filter (CF) may be provided on one surface of the second substrate 112 facing the first substrate 111. In this case, the first substrate 111 having the light emitting elements and the touch sensor (TS) and the second substrate 112 having the color filter (CF) may be bonded together by a filler 150. Here, the filler 150 may be made of an organic material having adhesive properties, and may be, for example, a transparent adhesive resin layer (OCR).

[0121] The color filters (CF) may be patterned for each sub-pixel (SP1, SP2, SP3, SP4). A black matrix (BM) may be provided between the color filters (CF). The black matrix (BM) is provided between the sub-pixels (SP1, SP2, SP3, SP4) to prevent color mixing between adjacent sub-pixels (SP1, SP2, SP3, SP4) and to prevent externally incident light from reflecting off multiple wirings, such as the scan line (SCANL), data line (DL), pixel power line (VDDL), common power line (VSSL), reference line (RL), touch line (TL), and touch bridge line (TBL), provided between the sub-pixels (SP1, SP2, SP3, SP4).

[0122] The transparent display panel 110 according to an embodiment of the present invention can form the touch sensor electrode (TSE) of the touch sensor (TS) and the cathode electrode (CE) of the light-emitting element in the same layer using the first undercut structure (UC1). The transparent display panel 110 according to an embodiment of the present invention has a simple touch process and does not require the addition of a separate mask for the touch sensor electrode (TSE). As a result, the transparent display panel 110 according to an embodiment of the present invention can realize process optimization and reduce production energy.

[0123] In addition, the transparent display panel 110 according to one embodiment of the present invention can form the first undercut structure (UC1) without impairing light transmittance by forming the first organic pattern (OP1) made of a transparent material and a plurality of inorganic films.

[0124] In addition, the transparent display panel 110 according to an embodiment of the present invention may be configured so that the planarization layer (PLN) provided in the non-transmitting area (NTA) does not overlap with the first opening area (OA1) of the interlayer insulating film (ILD), the first passivation layer (PAS1), and the second passivation layer (PAS2). As a result, the transparent display panel 110 according to an embodiment of the present invention can prevent moisture (H2O) from penetrating into the planarization layer (PLN) and further prevent moisture (H2O) contained in the filler 150 from being transferred to the light emitting element.

[0125] In addition, the transparent display panel 110 according to an embodiment of the present invention can prevent the touch line (TL) from lowering the luminous efficiency of the pixel (P) by disposing the touch line (TL) below the light emitting element.

[0126] In addition, the transparent display panel 110 according to one embodiment of the present invention arranges the touch lines (TL) so that they do not overlap with the circuit areas (CA1, CA2, CA3, CA4), thereby minimizing the influence of the circuit elements and improving the uniformity of the parasitic capacitance.

[0127] In addition, the transparent display panel 110 according to one embodiment of the present invention has a plurality of touch lines (TL) arranged in the first non-transmissive area (NTA1) and only one touch bridge line (TBL) for connecting a plurality of touch sensors (TS) to the second non-transmissive area (NTA2), thereby minimizing the reduction in the area of ​​the transmissive area (TA) and the reduction in light transmittance due to the plurality of touch lines (TL) and touch bridge line (TBL).

[0128] 7 and 8 show that the first undercut structure (UC1) has one undercut (UC11), but this is not necessarily limited to this. In other embodiments, the first undercut structure (UC1) may have multiple undercuts. Below, with reference to FIGS. 10 to 17, an embodiment in which the first undercut structure (UC1) includes multiple undercuts will be described in detail.

[0129] FIG. 10 is a plan view showing a second embodiment of the touch sensor and first undercut structure shown in FIG. 3, FIG. 11 is a cross-sectional view showing an example of III-III' in FIG. 10, and FIG. 12 is a diagram for explaining an example in which a foreign object is inserted into the undercut structure.

[0130] The transparent display panel 110 shown in Figures 10 and 11 is substantially the same as the transparent display panel 110 shown in Figures 7 and 8 except for the first undercut structure (UC1). Hereinafter, the differences will be mainly described, and a description of the substantially same components will be omitted.

[0131] 10 and 11, the transparent display panel 110 according to the second embodiment of the present invention may have two undercuts (UC12, UC13) formed in the second undercut structure (UC2). To this end, the transparent display panel 110 according to the second embodiment of the present invention may have a plurality of opening regions (OA1, OA2) in the interlayer insulating film (ILD), the first passivation film (PAS1), and the second passivation film (PAS2).

[0132] Specifically, the interlayer insulating film (ILD) is not provided in at least a portion of the transparent region (TA) to form a second undercut structure (UC2) in the transparent region (TA), and multiple opening regions (OA1, OA2) exposing the buffer film (BF) can be formed.

[0133] The interlayer insulating film (ILD) may be absent in at least a portion of the transmissive region (TA) to form two undercuts (UC12, UC13) using a second undercut structure (UC2) in the transmissive region (TA), forming a first opening region (OA1) and a second opening region (OA2) that expose the buffer film (BF). The first opening region (OA1) of the interlayer insulating film (ILD) may be present in the transmissive region (TA) and may at least partially overlap an edge region of the touch sensor electrode (TSE). The second opening region (OA2) of the interlayer insulating film (ILD) may be present between the non-transmissive region (NTA) and the first opening region (OA1) and may at least partially overlap an edge region of the cathode electrode (CE).

[0134] The first passivation film (PAS1) may be provided on the interlayer insulating film (ILD). The first passivation film (PAS1) may be absent from at least a portion of the transparent region (TA) to form two undercuts (UC12, UC13) using a second undercut structure (UC2) in the transparent region (TA), thereby forming a first opening region (OA1) and a second opening region (OA2) exposing the buffer film (BF). The first opening region (OA1) of the first passivation film (PAS1) may overlap the first opening region (OA1) of the interlayer insulating film (ILD), and the second opening region (OA2) of the first passivation film (PAS1) may overlap the second opening region (OA2) of the interlayer insulating film (ILD).

[0135] The second passivation film (PAS2) may be provided on the first passivation film (PAS1). The second passivation film (PAS2) may be absent from at least a portion of the transparent region (TA) to form two undercuts (UC12, UC13) using a second undercut structure (UC2) in the transparent region (TA), thereby forming a first opening region (OA1) and a second opening region (OA2) that expose the buffer film (BF). The first opening region (OA1) of the second passivation film (PAS2) may overlap the first opening region (OA1) of the first passivation film (PAS1) and the first opening region (OA1) of the interlayer insulating film (ILD). The second opening area (OA2) of the second passivation film (PAS2) can overlap the second opening area (OA2) of the first passivation film (PAS1) and the second opening area (OA2) of the interlayer insulating film (ILD).

[0136] A planarization film (PLN) may be provided on the second passivation film (PAS2). The planarization film (PLN) is provided in the non-transmissive area (NTA) and may not be provided in at least a portion of the transmissive area (TA). The planarization film (PLN) may cause light refraction while transmitting light, thereby reducing transparency. Therefore, the transparent display panel 110 according to the second embodiment of the present invention can improve transparency by removing a portion of the planarization film (PLN) in the transmissive area (TA).

[0137] The planarization film (PLN) may be provided so as not to overlap the opening regions of the inorganic films, particularly the second opening region (OA2). The planarization film (PLN) may be provided on the inorganic films provided in the non-transparent region (NTA), and its entire lower surface may be in contact with the upper surface of the topmost inorganic film among the inorganic films. For example, the planarization film (PLN) may be provided on the interlayer insulating film (ILD), first passivation film (PAS1), and second passivation film (PAS2) provided in the non-transparent region (NTA), and its entire lower surface may be in contact with the upper surface of the second passivation film (PAS2). In other words, a portion of the lower surface of the planarization film (PLN) may not be exposed in the second opening region (OA2) of the inorganic films.

[0138] As shown in FIG. 12 , the planarization film (PLN) may be formed so that a portion of its lower surface is exposed in the opening regions of the inorganic films. In this case, the lower surface of the planarization film (PLN) may contact the filler 150 in the opening regions of the inorganic films. Here, the filler 150 may contain moisture (H2O), and the moisture (H2O) contained in the filler 150 may permeate the lower surface of the planarization film (PLN) that is in contact with the filler 150. The moisture (H2O) that permeates the planarization film (PLN) that is in contact with the light-emitting elements of the subpixels (SP1, SP2, SP3, SP4) may be transferred to the light-emitting elements. This may cause deterioration of the light-emitting elements, resulting in a fade-out phenomenon in which brightness is reduced.

[0139] The transparent display panel 110 according to the second embodiment of the present invention is configured so that the planarization film (PLN) does not overlap with the first opening region (OA1) of the interlayer insulating film (ILD), the first passivation film (PAS1), and the second passivation film (PAS2), thereby preventing moisture (H2O) from penetrating into the planarization film (PLN) and further preventing the moisture (H2O) contained in the filler 150 from being transmitted to the light-emitting element.

[0140] The transparent display panel 110 according to the second embodiment of the present invention may form a second undercut structure (UC2) using the organic pattern (OP) and a plurality of inorganic insulating films.

[0141] Specifically, the second undercut structure (UC2) may include a second organic pattern (OP2) and a plurality of inorganic layers including a first opening region (OA1) and a second opening region (OA2). The second organic pattern (OP2) may be formed in the same layer and made of the same material as the planarization layer (PLN). Here, the second organic pattern (OP2) may be disposed separately from the planarization layer (PLN) provided in the non-transmitting region (NTA). However, this is not necessarily limited to this. The second organic pattern (OP2) may also be formed in a different layer and made of a different material than the planarization layer (PLN). The plurality of inorganic layers may be first and second passivation layers (PAS1, PAS2) and an interlayer dielectric (ILD).

[0142] The second organic pattern (OP2) may be formed on the inorganic layers between the first opening region (OA1) and the second opening region (OA2). The first opening region (OA1) of the inorganic layers may have a planar, closed shape along the edge of the touch sensor (TS), as shown in FIG. 10 . For example, the first opening region (OA1) of the inorganic layers may have a planar, rectangular shape, but is not limited thereto. For example, the second organic pattern (OP2) may have a closed rectangular ring shape, forming a kind of wall extending along the outer periphery of the touch sensor (TS). However, the second organic pattern (OP2) is separated from the inorganic layers in the subpixel region (e.g., the non-transmissive region (NTA)) and from the inorganic layers in the touch sensor region (e.g., the transmissive region (TA)). The second organic pattern (OP2) may have eaves or overhangs on both sides to form two undercut regions (UC12, UC13) (e.g., an inner undercut region and an outer undercut region). The second organic pattern (OP2) may have a mushroom-shaped or inverted tapered cross section. The second organic pattern (OP2) may have various cross sections, such as an inverted trapezoid or an inverted triangle. This allows a double trench to be formed around each touch sensor (TS).

[0143] The second opening area (OA2) of the inorganic films may be provided between the first opening area (OA1) and the non-transmitting area (NTA), as shown in Fig. 10. The second opening area (OA2) of the inorganic films may be spaced apart from the first opening area (OA1) and have a planar closed shape along the outer edge of the first opening area (OA1). As an example, the second opening area (OA2) of the inorganic films may have a planar rectangular shape, but is not necessarily limited thereto.

[0144] Therefore, the inorganic films provided between the first opening region (OA1) and the second opening region (OA2) can be separated from the inorganic films provided in the region overlapping with the touch sensor (TS) by sandwiching the first opening region (OA1). Also, the inorganic films provided between the first opening region (OA1) and the second opening region (OA2) can be separated from the inorganic films provided in the region overlapping with the sub-pixels (SP1, SP2, SP3, SP4) by sandwiching the second opening region (OA2).

[0145] The second organic pattern (OP2) may be formed on the inorganic films between the first opening region (OA1) and the second opening region (OA2) and may be spaced apart from the inorganic films in the region overlapping the subpixels (SP1, SP2, SP3, SP4) and the touch sensor (TS). The second organic pattern (OP2) may be formed on the entire upper surfaces of the inorganic films between the first opening region (OA1) and the second opening region (OA2). As shown in FIGS. 10 and 11, the second organic pattern (OP2) may be formed along the outer edge region (peripheral region) of the touch sensor (TS) having a second width (W2) on the upper surfaces of the inorganic films between the first opening region (OA1) and the second opening region (OA2). The second organic pattern (OP2) may be a ring pattern having a closed shape in a planar view. As an example, the second organic pattern (OP2) may be a planar rectangular ring pattern.

[0146] The second organic pattern (OP2) may at least partially overlap with the first opening region (OA1) of the plurality of inorganic films. The second undercut structure (UC2) may include a second undercut (UC12) formed in a region where the second organic pattern (OP2) overlaps with at least a portion of the first opening region (OA1). The second undercut structure (UC2) may be formed by the second organic pattern (OP2) protruding from the plurality of inorganic films provided between the first opening region (OA1) and the second opening region (OA2) in the first opening region (OA1).

[0147] In the second undercut (UC12), the second organic pattern (OP2) may protrude toward the touch sensor (TS) beyond the inorganic films provided between the first opening area (OA1) and the second opening area (OA2). Thus, the second undercut structure (UC2) exposes at least a portion of the lower surface of the second organic pattern (OP2) in the first opening area (OA1), and a separation space may be formed between the exposed lower surface and the buffer film (BF) without providing the inorganic films below the exposed lower surface.

[0148] In addition, the second organic pattern (OP2) may at least partially overlap with the second opening region (OA2) of the plurality of inorganic films. The second undercut structure (UC2) may include a third undercut (UC13) formed in a region where the second organic pattern (OP2) overlaps with at least a portion of the second opening region (OA2). The second undercut structure (UC2) may be formed by the second organic pattern (OP2) protruding from the plurality of inorganic films provided between the first opening region (OA1) and the second opening region (OA2) in the second opening region (OA2), thereby forming the third undercut (UC13).

[0149] In the third undercut (UC13), the second organic pattern (OP2) may protrude toward the sub-pixels (SP1, SP2, SP3, SP4) beyond the inorganic layers provided between the first opening region (OA1) and the second opening region (OA2). Thus, the second undercut structure (UC2) exposes at least a portion of the lower surface of the second organic pattern (OP2) in the second opening region (OA2), and a separation space may be formed between the exposed lower surface and the buffer layer (BF) without providing the inorganic layers below the exposed lower surface.

[0150] Such a second undercut structure (UC2) may be provided within the transmissive area (TA). More specifically, the second undercut structure (UC2) may be provided in an edge region of the touch sensor (TS) or between the touch sensor (TS) and the non-transmissive area (NTA). In one example, the second undercut structure (UC2) may be formed along the edge region of the transmissive area (TA). In addition, the second undercut structure (UC2) may have a planar closed shape. In one example, the second undercut structure (UC2) may have a planar rectangular shape.

[0151] The transparent display panel 110 according to the second embodiment of the present invention forms a second undercut structure (UC2) using a second organic pattern (OP1) made of a transparent material and a plurality of inorganic films, thereby preventing a decrease in light transmittance due to the second undercut structure (UC2).

[0152] A first electrode layer 120, an organic light-emitting layer 130, a second electrode layer 140, and a bank 125 may be provided on the planarization film (PLN).

[0153] The first electrode layer 120 may be provided on the planarization layer (PLN) for each sub-pixel (SP1, SP2, SP3, SP4). The first electrode layer 120 is not provided in the transmissive region (TA). The first electrode layer 120 may be connected to the driving transistor (DTR). Specifically, the first electrode layer 120 may be connected to one of the source electrode (SE) and the drain electrode (DE) of the driving transistor (DTR) through a contact hole (not shown) that penetrates the planarization layer (PLN) and the first and second passivation layers (PAS1, PAS2).

[0154] The organic light-emitting layer 130 may be provided on the first electrode layer 120. The organic light-emitting layer 130 may be discontinuously separated between the non-transmissive area (NTA) and the transmissive area (TA) by the second undercut structure (UC2). Specifically, the organic light-emitting layer 130 may be separated into an organic light-emitting layer 131 provided in the non-transmissive area (NTA), an organic light-emitting layer 132 provided on the second organic pattern (OP2) of the second undercut structure (UC2), and an organic light-emitting layer 133 provided in the transmissive area (TA) by the second undercut structure (UC2). That is, the organic light-emitting layer 131 provided in the non-transmissive area (NTA) and the organic light-emitting layer 133 provided in the transmissive area (TA) may be separated from each other by the second undercut structure (UC2).

[0155] The second electrode layer 140 may be provided on the organic light-emitting layer 130 and the bank 125. When the second electrode layer 140 is deposited over the entire surface, the second electrode layer 140 may be continuously separated between the non-transmitting area (NTA) and the transmissive area (TA) by the second undercut structure (UC2). Specifically, the second electrode layer 140 may be separated by the second undercut structure (UC2) into a second electrode (CE) provided in the non-transmitting area (NTA), a second electrode (DTSE) provided on the second undercut structure (UC2), and a second electrode (TSE) provided in the transmissive area (TA).

[0156] Here, the second electrode (CE, hereinafter referred to as "cathode electrode") provided in the non-transmitting area (NTA) may be configured to constitute a light emitting element as a cathode electrode. The cathode electrode (CE) may be connected to the cathode contact electrode (CCT) and may receive power from the common power line (VSSL). Such a cathode electrode (CE) may be a common layer formed in common to the sub-pixels (SP1, SP2, SP3, SP4) and applying the same voltage.

[0157] In addition, the second electrode (TSE, hereinafter referred to as "touch sensor electrode") provided in the transmissive area (TA) may be configured to form a touch sensor (TS) as a touch sensor electrode. The touch sensor electrode (TSE) may be formed on a second passivation film (PAS2) provided in the transmissive area (TA). The touch sensor electrode (TSE) may overlap at least a portion of the first opening area (OA1) of the plurality of inorganic films in the edge area. The touch sensor electrode (TSE) may be connected to the touch contact electrode (TCT) and provide a capacitance change to the touch line (TL).

[0158] Meanwhile, the second electrode (DTSE, hereinafter referred to as "dummy touch sensor electrode") provided on the second undercut structure (UC2) may be configured to form a dummy touch sensor (DTS) as a dummy touch sensor electrode. The dummy touch sensor electrode (DTSE) is not connected to the touch sensor (TS) and does not function as the touch sensor (TS). The dummy touch sensor electrode (DTSE) is provided between the touch sensor (TS) and the light emitting element, and can more reliably separate the touch sensor electrode (TSE) of the touch sensor (TS) from the cathode electrode (CE) of the light emitting element.

[0159] The second electrode layer 140 including the cathode electrode (CE), the dummy touch sensor electrode (DTSE), and the touch sensor electrode (TSE) may be formed of a transparent metal material (TCO, Transparent Conductive Material) such as ITO or IZO, or a semi-transmissive metal material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). When the second electrode layer 140 is formed of a semi-transmissive metal material, microcavities can be formed to increase light output efficiency.

[0160] The transparent display panel 110 according to the second embodiment of the present invention can form the touch sensor electrode (TSE) of the touch sensor (TS) and the cathode electrode (CE) of the light-emitting element in the same layer using the second undercut structure (UC2). The transparent display panel 110 according to the second embodiment of the present invention has a simple touch process and does not require the addition of a separate mask for the touch sensor electrode (TSE). That is, the second electrode layer 140 and the organic light-emitting layer 130 are stacked across the entire device and can be separated into different portions by the second organic pattern (OP2). Some of the separated portions can form part of the sub-pixel, and other portions can form part of the touch sensor (TS). Therefore, part of the touch sensor (TS) and part of the sub-pixel can be formed simultaneously in the same layer and with the same material. This reduces manufacturing time and cost and enables the manufacture of a thinner touch display device. As a result, the transparent display panel 110 according to an embodiment of the present invention can implement process optimization and reduce production energy.

[0161] In addition, the transparent display panel 110 according to the second embodiment of the present invention can form the second undercut structure (UC2) without impairing the light transmittance by forming the second organic pattern (OP2) made of a transparent material and a plurality of inorganic films.

[0162] In addition, the transparent display panel 110 according to the second embodiment of the present invention may be configured so that the planarization layer (PLN) provided in the non-transmitting area (NTA) does not overlap with the first and second opening areas (OA1, OA2) of the interlayer insulating film (ILD), the first passivation layer (PAS1), and the second passivation layer (PAS2). As a result, the transparent display panel 110 according to the second embodiment of the present invention can prevent moisture (H2O) from penetrating into the planarization layer (PLN) and further prevent moisture (H2O) contained in the filler 150 from being transferred to the light emitting element.

[0163] In addition, in the transparent display panel 110 according to the second embodiment of the present invention, the second organic pattern OP2 may be disposed apart from the planarization layer PLN provided to overlap the plurality of sub-pixels SP1, SP2, SP3, and SP4. As a result, even if moisture contained in the filler 150 penetrates the second organic pattern OP2, it may not be transferred to the light emitting element.

[0164] In addition, the transparent display panel 110 according to the second embodiment of the present invention has the second undercut (UC12) and the third undercut (UC13) in the second undercut structure (UC2), so that the cathode electrode (CE) constituting the light-emitting element and the touch sensor electrode (TSE) constituting the touch sensor (TS) can be safely separated even if they are formed in the same layer, thereby significantly reducing the occurrence of short circuits between the cathode electrode (CE) and the touch sensor electrode (TSE).

[0165] As shown in Figure 12, the planarization layer (PLN) may have an undercut structure formed by exposing a portion of its bottom surface in the opening regions of the inorganic layers. Such an undercut structure may be subject to the introduction of foreign matter (P) during the manufacturing process, and the second electrode layer 140 may be deposited on the undercut structure with the introduced foreign matter (P). A short circuit may occur if the cathode electrode (CE) of the light-emitting element and the touch sensor electrode (TSE) of the touch sensor (TS) are connected instead of being separated. In this case, the touch block including the touch sensor (TS) that has been shorted with the cathode electrode (CE) may not operate normally, and the light-emitting element may also not operate normally.

[0166] In order to separate the cathode electrode (CE) constituting the light-emitting element and the touch sensor electrode (TSE) constituting the touch sensor (TS), the transparent display panel 110 according to the second embodiment of the present invention may have a plurality of undercuts (UC12, UC13) formed therein as shown in Figures 10 and 11. In this case, even if a foreign object (P) is inserted into either the second undercut (UC12) or the third undercut (UC13) during the manufacturing process, a short circuit may not occur between the cathode electrode (CE) constituting the light-emitting element and the touch sensor electrode (TSE) constituting the touch sensor (TS).

[0167] For example, a foreign object (P) may be inserted into the third undercut (UC13). In this case, the cathode electrode (CE) constituting the light emitting element can be connected to the dummy touch sensor electrode (DTSE) without being separated from it. Since the dummy touch sensor electrode (DTSE) is separated from the touch sensor electrode (TSE) by the second undercut (UC12), the cathode electrode (CE) can be electrically connected to the dummy touch sensor electrode (DTSE) but electrically separated from the touch sensor electrode (TSE).

[0168] As another example, a foreign object (P) may be inserted into the second undercut (UC12). In this case, the touch sensor electrode (TSE) constituting the touch sensor (TS) can be connected to the dummy touch sensor electrode (DTSE) without being separated from it. Since the dummy touch sensor electrode (DTSE) is separated from the cathode electrode (CE) by the third undercut (UC13), the touch sensor electrode (TSE) can be electrically connected to the dummy touch sensor electrode (DTSE) but electrically separated from the cathode electrode (CE).

[0169] As a result, the transparent display panel 110 according to the second embodiment of the present invention can significantly reduce the short defect rate between the cathode electrode (CE) and the touch sensor electrode (TSE) by providing the second undercut (UC12) and the third undercut (UC13) in the second undercut structure (UC2).

[0170] In addition, the transparent display panel 110 according to the second embodiment of the present invention includes a dummy touch sensor electrode (DTSE) between the touch sensor (TS) and the light emitting element, thereby preventing or minimizing the occurrence of parasitic capacitance between the touch sensor (TS) and the light emitting element, for example, between the first electrode layer 120 and the cathode electrode (CE). That is, the dummy touch sensor electrode (DTSE) can act as a shielding film that blocks the parasitic capacitance that affects the touch sensor (TS).

[0171] The transparent display panel 110 according to the second embodiment of the present invention has a high noise-to-touch signal ratio and can improve ghost touch defects by reducing parasitic capacitance affecting the touch sensor (TS). Ghost touch defects can occur when a user touches the transparent display panel 110 with a finger and then releases it, as the temperature of the organic material in the transparent display panel 110 increases due to body heat, causing a change in dielectric constant. Even when no actual touch is made, the transparent display panel 110 may recognize a touch as a value sensed by the touch sensor (TS) being higher than the reference value for recognition as a touch due to the change in the dielectric constant of the organic material. The ghost touch defect is less likely to occur as the total amount of parasitic capacitance affecting the touch sensor (TS) or touch line (TL) is reduced. The transparent display panel 110 according to the second embodiment of the present invention can improve touch recognition rate by reducing parasitic capacitance affecting the touch sensor (TS).

[0172] Figure 13 is a plan view showing a third embodiment of the touch sensor and undercut structure shown in Figure 3, Figure 14 is a cross-sectional view showing an example of VI-VI' in Figure 13, Figure 15 is a plan view showing an example of a configuration for connecting a dummy touch sensor electrode to a common power supply pixel line, and Figure 16 is a cross-sectional view showing an example of V-V' in Figure 15.

[0173] The transparent display panel 110 shown in Figures 13 to 16 is substantially the same as the transparent display panel 110 shown in Figures 7 and 8 except for the first undercut structure (UC1). Hereinafter, the differences will be mainly described, and a description of the substantially same components will be omitted.

[0174] 13 and 14, the transparent display panel 110 according to the third embodiment of the present invention may have three undercuts (UC11, UC12, UC13). To this end, the transparent display panel 110 according to the third embodiment of the present invention may have a plurality of opening regions (OA1, OA2) in the interlayer insulating film (ILD), the first passivation film (PAS1), and the second passivation film (PAS2).

[0175] Specifically, the interlayer insulating film (ILD) is not provided in at least a portion of the transmissive region (TA) to form a first undercut structure (UC1) and a second undercut structure (UC2) in the transmissive region (TA), and a plurality of opening regions (OA1, OA2) exposing the buffer film (BF) can be formed.

[0176] The interlayer insulating film (ILD) may have a first undercut structure (UC1) and a second undercut structure (UC2) in the transmissive region (TA) to form three undercuts (UC11, UC12, UC13), and may have a first opening region (OA1) and a second opening region (OA2) that expose the buffer film (BF) without being present in at least a portion of the transmissive region (TA). The first opening region (OA1) of the interlayer insulating film (ILD) may be present in the transmissive region (TA) and may at least partially overlap with an edge region of the touch sensor electrode (TSE). The second opening region (OA2) of the interlayer insulating film (ILD) may be present between the non-transmissive region (NTA) and the first opening region (OA1) and may at least partially overlap with an edge region of the cathode electrode (CE).

[0177] The first passivation film (PAS1) may be provided on the interlayer insulating film (ILD). The first passivation film (PAS1) may have a first undercut structure (UC1) and a second undercut structure (UC2) in the transparent region (TA) to form three undercuts (UC11, UC12, UC13) without providing at least a portion of the transparent region (TA) to form first opening region (OA1) and second opening region (OA2) exposing the buffer film (BF). The first opening region (OA1) of the first passivation film (PAS1) may overlap the first opening region (OA1) of the interlayer insulating film (ILD), and the second opening region (OA2) of the first passivation film (PAS1) may overlap the second opening region (OA2) of the interlayer insulating film (ILD).

[0178] The second passivation film (PAS2) may be provided on the first passivation film (PAS1). The second passivation film (PAS2) may be absent from at least a portion of the transparent region (TA) to form three undercuts (UC11, UC12, UC13) using a first undercut structure (UC1) and a second undercut structure (UC2) in the transparent region (TA), thereby forming a first opening region (OA1) and a second opening region (OA2) that expose the buffer film (BF). The first opening region (OA1) of the second passivation film (PAS2) may overlap the first opening region (OA1) of the first passivation film (PAS1) and the first opening region (OA1) of the interlayer insulating film (ILD). The second opening area (OA2) of the second passivation film (PAS2) can overlap the second opening area (OA2) of the first passivation film (PAS1) and the second opening area (OA2) of the interlayer insulating film (ILD).

[0179] A planarization layer (PLN) may be provided on the second passivation layer (PAS2). The planarization layer (PLN) may be provided in the non-transmissive area (NTA) and may not be provided in at least a portion of the transmissive area (TA). The planarization layer (PLN) may cause light refraction as light passes through it, thereby reducing transparency. Therefore, the transparent display panel 110 according to the third embodiment of the present invention can improve transparency by removing a portion of the planarization layer (PLN) in the transmissive area (TA).

[0180] The planarization film (PLN) may be provided so as not to overlap the opening regions of the inorganic films, particularly the second opening region (OA2). The planarization film (PLN) may be provided on the inorganic films provided in the non-transparent region (NTA), and its entire lower surface may be in contact with the upper surface of the uppermost inorganic film among the inorganic films. For example, the planarization film (PLN) may be provided on the interlayer insulating film (ILD), first passivation film (PAS1), and second passivation film (PAS2) provided in the non-transparent region (NTA), and its entire lower surface may be in contact with the upper surface of the second passivation film (PAS2). In other words, a portion of the lower surface of the planarization film (PLN) may not be exposed in the second opening region (OA2) of the inorganic films.

[0181] The transparent display panel 110 according to the third embodiment of the present invention is configured so that the planarization film (PLN) does not overlap with the first opening region (OA1) of the interlayer insulating film (ILD), the first passivation film (PAS1), and the second passivation film (PAS2), thereby preventing moisture (H2O) from penetrating into the planarization film (PLN) and further preventing the moisture (H2O) contained in the filler 150 from being transmitted to the light-emitting element.

[0182] The transparent display panel 110 according to the third embodiment of the present invention may form a first undercut structure UC1 using an organic pattern OP and a plurality of inorganic insulating layers.

[0183] Specifically, the first undercut structure (UC1) and the second undercut structure (UC2) may include a first organic pattern (OP1), a second organic pattern (OP2), and multiple inorganic layers including a first opening region (OA1) and a second opening region (OA2). The first organic pattern (OP1) and the second organic pattern (OP2) may be formed of the same material in the same layer as the planarization layer (PLN). Here, the first organic pattern (OP1) and the second organic pattern (OP2) may be disposed separately from the planarization layer (PLN) provided in the non-transmitting region (NTA). However, this is not necessarily limited to this. The first organic pattern (OP1) and the second organic pattern (OP2) may also be formed of a different material in a different layer from the planarization layer (PLN). The multiple inorganic layers may be first and second passivation layers (PAS1 and PAS2) and an interlayer insulating film (ILD).

[0184] The first opening areas (OA1) of the plurality of inorganic films may have a planar closed shape along the edge area of ​​the touch sensor (TS) as shown in Fig. 13. As an example, the first opening areas (OA1) of the plurality of inorganic films may have a planar rectangular shape, but are not necessarily limited thereto.

[0185] The second opening area (OA2) of the inorganic films may be provided between the first opening area (OA1) and the non-transmitting area (NTA), as shown in Fig. 13. The second opening area (OA2) of the inorganic films may be spaced apart from the first opening area (OA1) and have a planar closed shape along the outer edge of the first opening area (OA1). As an example, the second opening area (OA2) of the inorganic films may have a planar rectangular shape, but is not necessarily limited thereto.

[0186] Therefore, the inorganic films provided between the first opening region (OA1) and the second opening region (OA2) can be separated from the inorganic films provided in the region overlapping with the touch sensor (TS) by sandwiching the first opening region (OA1). Also, the inorganic films provided between the first opening region (OA1) and the second opening region (OA2) can be separated from the inorganic films provided in the region overlapping with the sub-pixels (SP1, SP2, SP3, SP4) by sandwiching the second opening region (OA2).

[0187] The first organic pattern (OP1) may be provided on a plurality of inorganic films provided in an area overlapping the touch sensor (TS) and may be spaced apart from a plurality of inorganic films provided between the first opening area (OA1) and the second opening area (OA2). The first organic pattern (OP1) may be provided on a portion of the upper surfaces of the plurality of inorganic films provided in an area overlapping the touch sensor (TS). The first organic pattern (OP1) may be formed along the edge of the touch sensor (TS) with a first width (W1) on the upper surfaces of the plurality of inorganic films provided in an area overlapping the touch sensor (TS), as shown in FIG. 13. The first organic pattern (OP1) may be a ring pattern having a planar closed shape. For example, the first organic pattern (OP1) may be a planar rectangular ring pattern.

[0188] The first organic pattern (OP1) may at least partially overlap with a first opening region (OA1) of the plurality of inorganic films. The first undercut structure (UC1) may include a first undercut (UC11) formed in a region where the first organic pattern (OP1) overlaps with at least a portion of the first opening region (OA1). The first undercut structure (UC1) may protrude from a plurality of inorganic films provided in a region where the first organic pattern (OP1) overlaps with the touch sensor (TS) in the first opening region (OA1), thereby forming the first undercut (UC11).

[0189] In the first undercut (C11), the first organic pattern (OP1) may protrude toward the sub-pixels (SP1, SP2, SP3, SP4) beyond the inorganic films provided in the area overlapping with the touch sensor (TS). Thus, the first undercut structure (UC1) exposes at least a portion of the lower surface of the first organic pattern (OP1) in the first opening region (OA1), and a separation space may be formed between the exposed lower surface and the buffer film (BF) without providing the inorganic films below the exposed lower surface.

[0190] The second organic pattern (OP2) may be disposed spaced apart from the first organic pattern (OP1). The second organic pattern (OP2) may be disposed on a plurality of inorganic films disposed between the first opening region (OA1) and the second opening region (OA2), and may be disposed spaced apart from a plurality of inorganic films disposed in an area overlapping the plurality of subpixels (SP1, SP2, SP3, SP4) and a plurality of inorganic films disposed in an area overlapping the touch sensor (TS). The second organic pattern (OP2) may be disposed on the entire upper surfaces of the plurality of inorganic films disposed between the first opening region (OA1) and the second opening region (OA2). The second organic pattern (OP2) may be formed along an outer edge region (peripheral region) of the touch sensor (TS) having a second width (W2) on the upper surfaces of the plurality of inorganic films disposed between the first opening region (OA1) and the second opening region (OA2), as shown in FIGS. 13 and 14. The second organic pattern (OP2) may be a ring pattern having a planar closed shape, for example, a square-shaped ring pattern.

[0191] The second organic pattern (OP2) may at least partially overlap with the first opening region (OA1) of the plurality of inorganic films. The second undercut structure (UC2) may include a second undercut (UC12) formed in a region where the second organic pattern (OP2) overlaps with at least a portion of the first opening region (OA1). The second undercut structure (UC2) may be formed by the second organic pattern (OP2) protruding from the plurality of inorganic films provided between the first opening region (OA1) and the second opening region (OA2) in the first opening region (OA1).

[0192] In the second undercut (UC12), the second organic pattern (OP2) may protrude toward the touch sensor (TS) beyond the inorganic films provided between the first opening area (OA1) and the second opening area (OA2). Thus, the second undercut structure (UC2) exposes at least a portion of the lower surface of the second organic pattern (OP2) in the first opening area (OA1), and a separation space may be formed between the exposed lower surface and the buffer film (BF) without providing the inorganic films below the exposed lower surface.

[0193] In addition, the second organic pattern (OP2) may at least partially overlap with the second opening region (OA2) of the plurality of inorganic films. The second undercut structure (UC2) may include a third undercut (UC13) formed in a region where the second organic pattern (OP2) overlaps with at least a portion of the second opening region (OA2). The second undercut structure (UC2) may be formed by the second organic pattern (OP2) protruding from the plurality of inorganic films provided between the first opening region (OA1) and the second opening region (OA2) in the second opening region (OA2), thereby forming the third undercut (UC13).

[0194] In the third undercut (UC13), the second organic pattern (OP2) may protrude toward the sub-pixels (SP1, SP2, SP3, SP4) beyond the inorganic layers provided between the first opening region (OA1) and the second opening region (OA2). Thus, the second undercut structure (UC2) exposes at least a portion of the lower surface of the second organic pattern (OP2) in the second opening region (OA2), and a separation space may be formed between the exposed lower surface and the buffer layer (BF) without providing the inorganic layers below the exposed lower surface.

[0195] The first undercut structure (UC1) and the second undercut structure (UC2) may be provided in the transmissive area (TA). More specifically, the first undercut structure (UC1) and the second undercut structure (UC2) may be provided in the edge area of ​​the touch sensor (TS) or between the touch sensor (TS) and the non-transmissive area (NTA). In one example, the first undercut structure (UC1) and the second undercut structure (UC2) may be formed along the edge area of ​​the transmissive area (TA). In addition, the first undercut structure (UC1) and the second undercut structure (UC2) may have a planar closed shape. In one example, the first undercut structure (UC1) and the second undercut structure (UC2) may have a planar rectangular shape.

[0196] The transparent display panel 110 according to the third embodiment of the present invention forms a first undercut structure (UC1) and a second undercut structure (UC2) using a first organic pattern (OP1) and a second organic pattern (OP1) made of a transparent material and a plurality of inorganic films, thereby preventing a decrease in light transmittance due to the first undercut structure (UC1) and the second undercut structure (UC2).

[0197] A first electrode layer 120, an organic light-emitting layer 130, a second electrode layer 140, and a bank 125 may be provided on the planarization film (PLN).

[0198] The first electrode layer 120 may be provided on the planarization layer (PLN) for each sub-pixel (SP1, SP2, SP3, SP4). The first electrode layer 120 is not provided in the transmissive region (TA). The first electrode layer 120 may be connected to the driving transistor (DTR). Specifically, the first electrode layer 120 may be connected to one of the source electrode (SE) and the drain electrode (DE) of the driving transistor (DTR) through a contact hole (not shown) that penetrates the planarization layer (PLN) and the first and second passivation layers (PAS1, PAS2).

[0199] The organic light-emitting layer 130 may be provided on the first electrode layer 120. The organic light-emitting layer 130 may be discontinuously separated between the non-transmitting area (NTA) and the transmissive area (TA) by a first undercut structure (UC1) and a second undercut structure (UC2). Specifically, the organic light-emitting layer 130 may be separated by the first undercut structure (UC1) and the second undercut structure (UC2) into an organic light-emitting layer 131 provided in the non-transmitting area (NTA), an organic light-emitting layer 132 provided on the second organic pattern (OP2) of the second undercut structure (UC2), an organic light-emitting layer 134 provided between the first organic pattern (OP1) and the second organic pattern (OP2), and an organic light-emitting layer 133 provided in the transmissive area (TA). That is, the organic light-emitting layer 130 may have a first undercut structure (UC1) and a second undercut structure (UC2) such that the organic light-emitting layer 131 provided in the non-transmitting area (NTA) and the organic light-emitting layer 133 provided in the transmitting area (TA) are spaced apart from each other.

[0200] The second electrode layer 140 may be provided on the organic light-emitting layer 130 and the bank 125. When the second electrode layer 140 is deposited over the entire surface, the second electrode layer 140 may be discontinuously separated between the non-transmissive area (NTA) and the transmissive area (TA) by the first undercut structure (UC1) and the second undercut structure (UC2). Specifically, the second electrode layer 140 may be separated by the first undercut structure (UC1) and the second undercut structure (UC2) into a second electrode (CE) provided in the non-transmissive area (NTA), a second electrode (DTSE1) provided on the second organic pattern (OP2) in the second undercut structure (UC2), a second electrode (DTSE2) provided between the first organic pattern (OP1) and the second organic pattern (OP2), and a second electrode (TSE) provided in the transmissive area (TA).

[0201] Here, the second electrode (CE, hereinafter referred to as "cathode electrode") provided in the non-transmitting area (NTA) may be configured to constitute a light emitting element as a cathode electrode. The cathode electrode (CE) may be connected to the cathode contact electrode (CCT) and may receive power from the common power line (VSSL). Such a cathode electrode (CE) may be a common layer formed in common to the sub-pixels (SP1, SP2, SP3, SP4) and applying the same voltage.

[0202] In addition, the second electrode (TSE) provided in the transmissive area (TA) (hereinafter referred to as "touch sensor electrode") may be configured to form a touch sensor (TS) as a touch sensor electrode. The touch sensor electrode (TSE) may be formed on a second passivation film (PAS2) provided in the transmissive area (TA). The touch sensor electrode (TSE) may overlap at least a portion of the first opening area (OA1) of the plurality of inorganic films in the edge area. The touch sensor electrode (TSE) may be connected to the touch contact electrode (TCT) and provide a change in capacitance to the touch line (TL).

[0203] Meanwhile, the second electrode (DTSE1, hereinafter referred to as the "first dummy touch sensor electrode") provided on the second organic pattern (OP2) of the second undercut structure (UC2) may be configured to configure the first dummy touch sensor (DTS1) as the first dummy touch sensor electrode. The first dummy touch sensor electrode (DTSE1) is not connected to the touch sensor (TS) and does not function as the touch sensor (TS).

[0204] A second electrode (DTSE2, hereinafter referred to as the "second dummy touch sensor electrode") provided between the first organic pattern (OP1) and the second organic pattern (OP2) may be configured to constitute a second dummy touch sensor (DTS2) as a second dummy touch sensor electrode. The second dummy touch sensor electrode (DTSE2) is not connected to the touch sensor (TS) and does not function as the touch sensor (TS). The first and second dummy touch sensor electrodes (DTSE1, DTSE2) are provided between the touch sensor (TS) and the light emitting element, and can more reliably separate the touch sensor electrode (TSE) of the touch sensor (TS) from the cathode electrode (CE) of the light emitting element.

[0205] The second electrode layer 140, including the cathode electrode (CE), the first and second dummy touch sensor electrodes (DTSE1, DTSE2), and the touch sensor electrode (TSE), may be formed of a transparent metal material (TCO, Transparent Conductive Material) such as ITO or IZO, or a semi-transmissive metal material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). When the second electrode layer 140 is formed of a semi-transmissive metal material, the light output efficiency may be increased due to the microcavities.

[0206] The transparent display panel 110 according to the third embodiment of the present invention can form the touch sensor electrode (TSE) of the touch sensor (TS) and the cathode electrode (CE) of the light emitting element in the same layer using the first undercut structure (UC1) and the second undercut structure (UC2). The transparent display panel 110 according to the third embodiment of the present invention has a simple touch process and does not require the addition of a separate mask for the touch sensor electrode (TSE). As a result, the transparent display panel 110 according to an embodiment of the present invention can implement process optimization and reduce production energy.

[0207] In addition, the transparent display panel 110 according to the third embodiment of the present invention forms the first undercut structure (UC1) and the second undercut structure (UC2) using a first organic pattern (OP1) and a second organic pattern (OP2) made of a transparent material and a plurality of inorganic films, thereby making it possible to form the first undercut structure (UC1) and the second undercut structure (UC2) without loss of light transmittance.

[0208] In addition, the transparent display panel 110 according to the third embodiment of the present invention may be configured so that the planarization layer (PLN) provided in the non-transmitting area (NTA) does not overlap with the first and second opening areas (OA1, OA2) of the interlayer insulating film (ILD), the first passivation layer (PAS1), and the second passivation layer (PAS2). As a result, the transparent display panel 110 according to the third embodiment of the present invention can prevent moisture (H2O) from penetrating into the planarization layer (PLN) and further prevent moisture (H2O) contained in the filler 150 from being transferred to the light emitting element.

[0209] In addition, in the transparent display panel 110 according to the third embodiment of the present invention, the first organic pattern OP1 and the second organic pattern OP2 may be disposed apart from the planarization layer (PLN) provided to overlap with the plurality of sub-pixels (SP1, SP2, SP3, SP4). As a result, even if moisture contained in the filler 150 penetrates into the first organic pattern OP1 or the second organic pattern OP2, it may not be transferred to the light emitting element.

[0210] In addition, the transparent display panel 110 according to the third embodiment of the present invention includes the first undercut (UC11), the second undercut (UC12), and the third undercut (UC13), thereby significantly reducing the possibility of a short circuit occurring between the cathode electrode (CE) of the light-emitting element and the touch sensor electrode (TSE) of the touch sensor (TS). The transparent display panel 110 according to the third embodiment of the present invention further reduces the possibility of a short circuit occurring between the cathode electrode (CE) of the light-emitting element and the touch sensor electrode (TSE) of the touch sensor (TS) due to the large number of undercuts.

[0211] In addition, the transparent display panel 110 according to the third embodiment of the present invention includes first and second dummy touch sensor electrodes (DTSE1, DTSE2) between the touch sensor (TS) and the light emitting element, thereby preventing or minimizing the occurrence of parasitic capacitance between the touch sensor (TS) and the light emitting element, for example, between the first electrode layer 120 and the cathode electrode (CE). That is, the first and second dummy touch sensor electrodes (DTSE1, DTSE2) can function as a shielding film that blocks the parasitic capacitance that affects the touch sensor (TS).

[0212] Compared with the transparent display panel 110 according to the second embodiment, the transparent display panel 110 according to the third embodiment of the present invention can effectively block the parasitic capacitance affecting the touch sensor (TS) by the amount of the increased number of dummy touch sensor electrodes (DTSE), thereby further reducing the parasitic capacitance.

[0213] In addition, the transparent display panel 110 according to the third embodiment of the present invention significantly reduces parasitic capacitance affecting the touch sensor (TS), thereby significantly improving the noise-to-touch signal ratio and further improving ghost touch defects. As a result, the transparent display panel 110 according to the third embodiment of the present invention can further improve the touch recognition rate.

[0214] Meanwhile, the transparent display panel 110 according to the third embodiment of the present invention may connect the second dummy touch sensor electrode DTSE2 to the common power line VSSL. Specifically, the transparent display panel 110 according to the third embodiment of the present invention may include the common power line VSSL, a first power connector CT1, and a second power connector CT2, as shown in FIGS. 15 and 16.

[0215] The common power supply line (VSSL) may extend in a first direction (e.g., the Y-axis direction) in the first non-transmissive area (NTA1). The common power supply line (VSSL) may supply cathode power to the cathode electrodes (CE) of the sub-pixels (SP1, SP2, SP3, SP4) included in the display area (DA). Here, the cathode power may be a common power supply commonly supplied to the sub-pixels (SP1, SP2, SP3, SP4).

[0216] The first power connector (CT1) may electrically connect the common power line (VSSL) to the cathode electrode (CE) of the light emitting element. The first power connector (CT1) may be provided between the common power line (VSSL) and the third undercut (UC13) of the second undercut structure (UC2). The first power connector (CT1) may include a power connector line (VCL) and a cathode contact electrode (CCT).

[0217] The power supply connection line (VCL) may have one end connected to the common power supply line (VSSL) and the other end connected to the cathode contact electrode (CCT). The cathode contact electrode (CCT) may be provided between the common power supply line (VSSL) and the third undercut (UC13) of the second undercut structure (UC2). In one embodiment, the common power supply line (VSSL), the power supply connection line (VCL), and the cathode contact electrode (CCT) may be integrally formed in one layer, as shown in FIGS. 15 and 16. In another embodiment, the common power supply line (VSSL), the power supply connection line (VCL), and the cathode contact electrode (CCT) may be provided in different layers and electrically connected to each other via contact holes.

[0218] In one embodiment, the common power line (VSSL), the power supply connecting line (VCL), and the cathode contact electrode (CCT) may be provided between the first passivation film (PAS1) and the second passivation film (PAS2). The cathode contact electrode (CCT) may contact the cathode electrode (CE) using a third undercut structure (UC3). More specifically, a portion of the upper surface of the cathode contact electrode (CCT) may be exposed in a third opening region (OA3) provided in the second passivation film (PAS2). In addition, the planarization film (PLN) may not be provided on at least a portion of the upper surface of the cathode contact electrode (CCT) exposed by the third opening region (OA3), and may be formed to overlap at least a portion of the third opening region (OA3). The third undercut structure (UC3) may include an undercut formed in the planarization film (PLN) to expose at least a portion of the upper surface of the cathode contact electrode (CCT) and overlap the third opening area (OA3). The cathode contact electrode (CCT) may contact the cathode electrode (CE) at the upper surface exposed by the third undercut structure (UC3).

[0219] The second power connector (CT2) may electrically connect the first power connector (CT1) to the second dummy touch sensor electrode (DTSE2) of the second dummy touch sensor (DTS2). The second power connector (CT2) may electrically connect the cathode contact electrode (CCT) of the first power connector (CT1) to the second dummy touch sensor electrode (DTSE2) of the second dummy touch sensor (DTS2) using a plurality of electrodes.

[0220] Specifically, the second power connector (CT2) may include a first power connector electrode (CTE1), a second power connector electrode (CTE2), and a third power connector electrode (CTE3). The first power connector electrode (CTE1) may be electrically connected to the cathode contact electrode (CCT) through a fifth contact hole (CH5). In one embodiment, the first power connector electrode (CTE1) may be provided in the same layer as the gate electrode (GE) of the driving transistor (DTR).

[0221] The second power connecting electrode (CTE2) may be electrically connected at one end to the first power connecting electrode (CTE1) through the sixth contact hole (CH6), extend across the third undercut (UC13) of the second undercut structure (UC2), and be electrically connected at the other end to the third power connecting electrode (CTE3) through the seventh contact hole (CH7).

[0222] In one embodiment, the second power connecting electrode (CTE2) may be provided in the same layer as the light-shielding layer (LS), and therefore the second power connecting electrode (CTE2) may be covered by the buffer film (BF) under the third undercut (UC13) of the second undercut structure (UC2), and the top surface of the second power connecting electrode (CTE2) may not be exposed.

[0223] The third power connecting electrode (CTE3) may have one end formed under a plurality of inorganic films formed between the first opening area (OA1) and the second opening area (OA2) and may be electrically connected to the second power connecting electrode (CTE2) through the seventh contact hole (CH7). The third power connecting electrode (CTE3) may extend across the second undercut (UC12) and the first undercut (UC11) and may have the other end formed under a plurality of inorganic films formed in an area overlapping with the touch sensor (TS).

[0224] In one embodiment, the third power connecting electrode (CTE3) may be provided in the same layer as the gate electrode (GE) of the drive transistor (DTR). Therefore, the upper surface of the third power connecting electrode (CTE3) may be exposed in the second undercut (UC12) and the first undercut (UC11). The second dummy touch sensor electrode (DTSE2) may be provided on and in contact with the exposed upper surface of the third power connecting electrode (CTE3), thereby being electrically connected to the third power connecting electrode (CTE3). As a result, the second dummy touch sensor electrode (DTSE2) may be electrically connected to the common power line (VSSL) via the first power connector (CT1) and the second power connector (CT2).

[0225] As a result, the transparent display panel 110 according to the third embodiment of the present invention can apply a cathode power supply to the second dummy touch sensor electrode (DTSE2). Since the transparent display panel 110 according to the third embodiment of the present invention applies a constant voltage to the second dummy touch sensor electrode (DTSE2), it is possible to predict the parasitic capacitance generated between the second dummy touch sensor electrode (DTSE2) and the touch sensor electrode (TSE), and touch control can be facilitated. In addition, the transparent display panel 110 according to the third embodiment of the present invention can also reduce touch driving noise.

[0226] On the other hand, if the second dummy touch sensor electrode (DTSE2) is in a floating state, the voltage of the second dummy touch sensor electrode (DTSE2) may fluctuate due to peripheral signal lines, circuit elements, and light emitting elements, making it impossible to predict the fluctuating voltage. In this case, it becomes difficult to predict the parasitic capacitance generated between the second dummy touch sensor electrode (DTSE2) and the touch sensor electrode (TSE), making it difficult to control touch driving.

[0227] Therefore, the transparent display panel 110 according to the third embodiment of the present invention may electrically connect the second dummy touch sensor electrode (DTSE2) to the common power line (VSSL), thereby preventing parasitic capacitance from occurring between the second dummy touch sensor electrode (DTSE2) and the touch sensor electrode (TSE) and enabling stable touch control.

[0228] Meanwhile, in the transparent display panel 110 according to the third embodiment of the present invention, if a foreign object is inserted into either the first undercut (UC11) or the second undercut (UC12), the second power connection electrode (CTE2) can be laser-cut along the cutting line (CL). If a foreign object is inserted into either the first undercut (UC11) or the second undercut (UC12), the second dummy touch sensor electrode (DTSE2) can be connected to the touch sensor electrode (TSE) of the touch sensor (TS) without being separated. In this case, the second dummy touch sensor electrode (DTSE2) can be electrically connected to the touch sensor electrode (TSE) of the touch sensor (TS). Since the second dummy touch sensor electrode (DTSE2) is electrically connected to the common power line (VSSL) and the cathode electrode (CE) via the first power connector (CT1) and the second power connector (CT2), a short circuit occurs between the cathode electrode (CE) and the touch sensor electrode (TSE).

[0229] Therefore, in the transparent display panel 110 according to the third embodiment of the present invention, when the second dummy touch sensor electrode (DTSE2) is electrically connected to the touch sensor electrode (TSE), one of the components of the second power connector (CT2), for example, the second power connector electrode (CTE2), can be laser cut along the cutting line (CL). As a result, the transparent display panel 110 according to the third embodiment of the present invention can prevent a short circuit between the cathode electrode (CE) and the touch sensor electrode (TSE) through the second dummy touch sensor electrode (DTSE2).

[0230] FIG. 17 is a plan view showing a fourth example of the touch sensor and first undercut structure shown in FIG.

[0231] Although the transparent display panel 110 according to the above-described various embodiments has been described as having the first undercut structure UC1 having a rectangular shape with right-angled corners in a planar state, the present invention is not necessarily limited thereto.

[0232] 17, the transparent display panel 110 according to the fourth embodiment of the present invention may have a first undercut structure (UC1) and a second undercut structure (UC2) each having a planar rectangular shape with rounded corners. Accordingly, the first organic pattern (OP1) constituting the first undercut structure (UC1) may have a planar rectangular shape with rounded corners (CN1). The second organic pattern (OP2) constituting the second undercut structure (UC2) may have a planar rectangular shape with rounded corners (CN2). The first opening region (OA1) and the second opening region (OA2) formed in the inorganic films may also have a planar rectangular shape with rounded corners, like the first and second organic patterns (OP1, OP2).

[0233] If the corners are right angles, it may be difficult for the first undercut structure (UC1) and the second undercut structure (UC2) to maintain the undercut shape at the corners, which may make them vulnerable to moisture permeation. Also, the first undercut structure (UC1) and the second undercut structure (UC2) have the shortest distance from the light emitting element at the corners, so they may also have the shortest moisture permeation path.

[0234] In the transparent display panel 110 according to the fourth embodiment of the present invention, the first undercut structure (UC1) and the second undercut structure (UC2) are formed with rounded corners, which facilitates the formation of undercuts at the corners and increases the number of moisture permeation paths to the light-emitting element.

[0235] The transparent display device or touch display device according to the embodiments of the present specification can be described as follows.

[0236] A transparent display device including a touch sensor according to an embodiment of the present specification may include: a plurality of sub-pixels including light-emitting elements each including an anode electrode, a light-emitting layer, and a cathode electrode, disposed in a non-transmissive region of a substrate; a touch sensor disposed in a transmissive region of the substrate and including a touch sensor electrode; and an undercut structure disposed in the transmissive region of the substrate, separating the cathode electrode of the light-emitting element from the touch sensor electrode. The undercut structure may include a plurality of inorganic films including an opening region disposed between an edge region of the touch sensor and an edge region of one of the plurality of sub-pixels, and an organic pattern disposed on the edge region of the plurality of inorganic films and spaced apart from the plurality of sub-pixels.

[0237] According to one or more embodiments of the present specification, the transparent display device may further include a planarization film provided between the anode electrode of the light-emitting element and the substrate in the non-transmitting area, and the planarization film may be separated from the organic pattern by an undercut structure.

[0238] According to one or more embodiments herein, the organic pattern may be provided in the same layer as the planarization film, and the planarization film may be provided on the inorganic films in the non-transparent areas.

[0239] According to one or more embodiments herein, the planarization film may not overlap with the open regions of the plurality of inorganic films.

[0240] According to one or more embodiments of the present specification, the opening areas in the inorganic films include a first opening area that is configured to at least partially overlap an edge area of ​​the touch sensor electrode, the organic pattern is configured on the inorganic films in the area overlapping the touch sensor and includes a first organic pattern that is at least partially overlapping the first opening area, and the undercut structure includes a first undercut formed in the area where the first organic pattern overlaps at least partially with the first opening area.

[0241] According to one or more embodiments herein, the undercut structure may include multiple undercuts.

[0242] According to one or more embodiments of the present specification, the inorganic films may include a first opening region that is at least partially overlapping with an edge region of the touch sensor electrode, and a second opening region that is provided between the non-transparent region and the first opening region, and the organic pattern may include a second organic pattern that is provided on the inorganic films in the region between the first opening region and the second opening region.

[0243] According to one or more embodiments herein, the second organic pattern can have a planar closed shape.

[0244] According to one or more embodiments of the present disclosure, the transparent display device may further include a dummy touch sensor provided between the plurality of subpixels and the touch sensor, the dummy touch sensor including a dummy touch sensor electrode provided on the second organic pattern.

[0245] According to one or more embodiments herein, the cathode electrode, the touch sensor electrode, and the dummy touch sensor electrode may be provided in the same layer.

[0246] According to one or more embodiments of the present specification, the undercut structure may include a second undercut formed in a region where the second organic pattern overlaps with at least a portion of the first opening region, and a third undercut formed in a region where the second organic pattern overlaps with at least a portion of the second opening region.

[0247] According to one or more embodiments of the present specification, the organic pattern may be provided on a plurality of inorganic films provided in an area overlapping the touch sensor, and may further include a first organic pattern at least partially overlapping with the first opening area, and the undercut structure may further include a first undercut formed in an area where the first organic pattern overlaps with at least a portion of the first opening area.

[0248] According to one or more embodiments herein, the second organic pattern may be spaced apart from the first organic pattern and surround the first organic pattern.

[0249] According to one or more embodiments of the present disclosure, the transparent display device may further include a dummy touch sensor disposed between the plurality of subpixels and the touch sensor, the dummy touch sensor including a dummy touch sensor electrode. The dummy touch sensor may include a first dummy touch sensor including a first dummy touch sensor electrode disposed on an upper surface of the second organic pattern, and a second dummy touch sensor including a second dummy touch sensor electrode disposed in the first opening region. Both the first dummy touch sensor electrode and the second dummy touch sensor electrode may be electrically isolated from the touch sensor electrode.

[0250] According to one or more embodiments of the present disclosure, the second dummy touch sensor electrode may be electrically connected to a cathode electrode of a light-emitting element.

[0251] According to one or more embodiments of the present specification, the transparent display device may further include a common power line extending in a first direction in the non-transmissive region, a first power connector provided between the common power line and the third undercut and electrically connecting the common power line to the cathode electrode, and a second power connector electrically connecting the first power connector to the second dummy touch sensor electrode.

[0252] A transparent display device having a touch sensor according to an embodiment of the present specification may include a plurality of sub-pixels provided in a non-transmissive region of a substrate, each sub-pixel including a light-emitting element composed of an anode electrode, a light-emitting layer, and a cathode electrode; a touch sensor disposed in a transmissive region of the substrate, each sub-pixel including a touch sensor electrode; and an undercut structure including a plurality of undercuts separating the cathode electrode constituting the light-emitting element and the touch sensor electrode constituting the touch sensor.

[0253] According to one or more embodiments of the present specification, the transparent display device may further include a plurality of inorganic films including a plurality of opening regions provided between the plurality of subpixels and the touch sensor, and at least one organic pattern provided on the plurality of inorganic films and overlapping at least one of the plurality of opening regions.

[0254] According to one or more embodiments of the present disclosure, the inorganic films may include a first opening region at least partially overlapping an edge region of the touch sensor electrode. The organic pattern may be provided on the inorganic films in the region overlapping the touch sensor, and may include a first organic pattern at least partially overlapping the first opening region. The undercut structure may include a first undercut formed in a region where the first organic pattern overlaps at least partially with the first opening region.

[0255] According to one or more embodiments of the present disclosure, the inorganic films may include a first opening region at least partially overlapping an edge region of the touch sensor electrode, and a second opening region between the non-transmissive region and the first opening region. The organic pattern may include a second organic pattern disposed on the inorganic films in a region between the first opening region and the second opening region. The undercut structure may include a second undercut formed in a region where the second organic pattern overlaps at least a portion of the first opening region, and a third undercut structure formed in a region where the second organic pattern overlaps at least a portion of the second opening region.

[0256] According to one or more embodiments of the present disclosure, the transparent display device may further include a dummy touch sensor disposed on the second organic pattern and including a dummy touch sensor electrode.

[0257] According to one or more embodiments of the present specification, the cathode electrode of the light-emitting element, the touch sensor electrode, and the dummy touch sensor electrode may be formed of the same material in the same layer, or the cathode electrode of the light-emitting element, the touch sensor electrode, and the dummy touch sensor electrode may be electrically isolated from each other.

[0258] According to one or more embodiments herein, a dummy touch sensor electrode may be disposed between the cathode electrode and the touch sensor electrode.

[0259] According to one or more embodiments herein, each of the plurality of undercuts can have a planar closed shape, or each of the plurality of undercuts can have a planar rectangular shape with rounded corners.

[0260] A touch display device according to an embodiment of the present specification includes at least one sub-pixel disposed on a substrate, the sub-pixel including a cathode electrode, a light-emitting layer, and an anode electrode; a touch electrode disposed on the substrate; The touch electrode may include a trench disposed around the periphery of the touch electrode. The touch electrode and the cathode electrode of the at least one subpixel may include the same material, and the touch electrode may be separated from the cathode electrode of the at least one subpixel by the trench.

[0261] According to one or more embodiments of the present specification, the touch display device may further include an organic pattern disposed between the touch electrode and the at least one subpixel, and the organic pattern may include an overhang portion overlapping a portion of the trench.

[0262] According to one or more embodiments herein, the overhang portion and the trench form an undercut, and the undercut can be configured to separate the touch electrode and the cathode electrode of the at least one subpixel.

[0263] According to one or more embodiments of the present disclosure, the touch display device may further include a first stack of inorganic films disposed under the organic pattern, and the organic pattern and the first stack of inorganic films may surround the touch electrode in a closed shape.

[0264] According to one or more embodiments herein, the organic pattern and the first stack of inorganic film can have a mushroom shape or an inverse tapered shape in cross section.

[0265] According to one or more embodiments of the present disclosure, the touch display device may further include a second stack of inorganic films disposed below the touch electrode, and the organic pattern may be disposed on the outer periphery (outer edge) of the second stack of inorganic films or the first stack of inorganic films.

[0266] According to one or more embodiments of the present disclosure, the touch display device may further include a first undercut disposed under the first overhanging portion of the organic pattern and a second undercut disposed under the second overhanging portion of the organic pattern, and the first undercut and the second undercut may both be disposed between the touch electrode and the at least one subpixel.

[0267] According to one or more embodiments of the present disclosure, the touch display device may further include a dummy touch sensor electrode disposed on the organic pattern, wherein the dummy touch sensor electrode, the touch electrode, and the cathode electrode of the at least one subpixel may include the same material and be electrically isolated from each other.

[0268] According to one or more embodiments of the present disclosure, the touch display device may further include a first overhang portion disposed on the first surface of the first stack of inorganic films and a second overhang portion disposed on the second surface of the first stack of inorganic films, and the first overhang portion may be disposed closer to the touch electrode than the second overhang portion.

[0269] According to one or more embodiments herein, the trench and the organic pattern can form two concentric rings surrounding the touch electrode.

[0270] According to one or more embodiments herein, the touch display device may further include a dummy touch sensor electrode disposed in the trench, the dummy touch sensor electrode being spaced apart from the touch electrode.

[0271] According to one or more embodiments herein, the dummy touch sensor electrodes may include the same material as the cathode electrode and be disposed on the organic material.

[0272] According to one or more embodiments of the present disclosure, the dummy touch sensor electrodes may be electrically connected to the power supply lines via power supply connecting electrodes disposed under the overhanging portions of the organic patterns.

[0273] According to one or more embodiments herein, a power supply coupling electrode may be disposed between the touch electrode and the cathode electrode.

[0274] According to one or more embodiments herein, the power connection electrode can be in direct contact with the first stack of inorganic films disposed below the organic pattern.

[0275] A touch display device according to an embodiment of the present specification may include at least one subpixel disposed on a substrate, the subpixel including a cathode electrode, a light-emitting layer, and an anode electrode, a touch electrode disposed on the substrate, and an organic pattern disposed around the touch electrode. The touch electrode and the cathode electrode of the at least one subpixel may include the same material, and the touch electrode may be separated from the cathode electrode of the at least one subpixel by the organic pattern.

[0276] Although the present invention has been described in detail above with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments and can be embodied in various modifications without departing from the spirit and scope of the present invention. Therefore, the disclosed embodiments are intended to illustrate, rather than limit, the spirit and scope of the present invention. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not restrictive. The scope of the present invention should be interpreted by the scope of the claims, and all technical concepts within the scope equivalent thereto should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0277] 100: Transparent display device 110: Transparent display panel 111: First board 112: Second board 120: 1st electrode 130: Organic light-emitting layer CE: Cathode electrode TSE: Touch sensor electrode TS: Touch sensor TBL: Touch Bridge Line TCT: Touch contact electrode 150: Filling material VDDL: Pixel power supply line VSSL: Common power line RL: Reference Line DL: Data line TL: Touchline SCANL: Scan line UC1: First undercut structure UC2: Second undercut structure OP1: First organic pattern OP2: Second organic pattern

Claims

1. a plurality of sub-pixels provided in a non-transmitting region of the substrate, each sub-pixel including a light-emitting element, the light-emitting element including an anode electrode, a light-emitting layer, and a cathode electrode; a touch sensor disposed in a transmissive region of the substrate, the touch sensor including a touch sensor electrode; and an undercut structure separating a cathode electrode of the light-emitting element and a touch sensor electrode of the touch sensor, the undercut structure being disposed in a transmissive region of the substrate; The undercut structure is a plurality of inorganic films including an opening region provided between an edge region of the touch sensor and an edge region of one of the plurality of sub-pixels; and A transparent display device having a touch sensor, the touch sensor including an organic pattern provided on edge regions of the inorganic films and spaced apart from the sub-pixels.

2. In the non-transmissive region, a planarization layer is further provided between the anode electrode of the light emitting device and the substrate, The transparent display device having a touch sensor according to claim 1 , wherein the planarization film is separated from the organic pattern by the undercut structure.

3. the organic pattern is provided in the same layer as the planarization film; The transparent display device equipped with a touch sensor according to claim 2 , wherein the planarization film is provided on the plurality of inorganic films in the non-transmissive region.

4. The transparent display device equipped with a touch sensor according to claim 2 , wherein the planarization film does not overlap with the opening regions of the plurality of inorganic films.

5. The opening areas in the inorganic films include a first opening area that is provided to at least partially overlap an edge area of ​​the touch sensor electrode, the organic pattern is provided on a plurality of inorganic films in an area overlapping the touch sensor, and includes a first organic pattern at least partially overlapping the first opening area; The transparent display device having a touch sensor according to claim 1 , wherein the undercut structure includes a first undercut formed in a region where the first organic pattern overlaps at least a portion of the first opening region.

6. The transparent display device with a touch sensor according to claim 1 , wherein the undercut structure includes a plurality of undercuts.

7. the plurality of inorganic films include a first opening region provided to at least partially overlap an edge region of the touch sensor electrode, and a second opening region provided between the non-transmitting region and the first opening region; 7. The transparent display device according to claim 6, wherein the organic pattern includes a second organic pattern provided on a plurality of inorganic films in a region between the first opening region and the second opening region.

8. The transparent display device equipped with a touch sensor according to claim 7 , wherein the second organic pattern has a closed shape in a planar state.

9. 8. The transparent display device having a touch sensor according to claim 7, further comprising a dummy touch sensor provided between the plurality of sub-pixels and the touch sensor, the dummy touch sensor including a dummy touch sensor electrode provided on the second organic pattern.

10. The transparent display device having a touch sensor according to claim 9 , wherein the cathode electrode, the touch sensor electrode, and the dummy touch sensor electrode are provided in the same layer.

11. The undercut structure is a second undercut formed in a region where the second organic pattern overlaps at least a portion of the first opening region; and The transparent display device having a touch sensor according to claim 7 , wherein the second organic pattern includes a third undercut formed in an area overlapping at least a portion of the second opening area.

12. the organic pattern is provided on a plurality of inorganic films provided in an area overlapping the touch sensor, and further includes a first organic pattern at least partially overlapping the first opening area; The transparent display device having a touch sensor according to claim 11 , wherein the undercut structure further comprises a first undercut formed in a region where the first organic pattern overlaps at least a portion of the first opening region.

13. The transparent display device having a touch sensor according to claim 12 , wherein the second organic pattern is spaced apart from the first organic pattern and surrounds the first organic pattern.

14. a dummy touch sensor disposed between the plurality of sub-pixels and the touch sensor, the dummy touch sensor including a dummy touch sensor electrode; The dummy touch sensor a first dummy touch sensor including a first dummy touch sensor electrode provided on an upper surface of the second organic pattern; and a second dummy touch sensor including a second dummy touch sensor electrode provided in the first opening region; The transparent display device having a touch sensor according to claim 12 , wherein both the first dummy touch sensor electrode and the second dummy touch sensor electrode are electrically isolated from the touch sensor electrode.

15. The transparent display device having a touch sensor according to claim 14 , wherein the second dummy touch sensor electrode is electrically connected to a cathode electrode of the light emitting element.

16. a common power supply line extending in a first direction in the non-transparent region; a first power supply connector provided in the same layer as the common power supply line and electrically connecting the common power supply line and the cathode electrode; The transparent display device having a touch sensor according to claim 15 , further comprising a second power connector electrically connecting the first power connector and the second dummy touch sensor electrode.

17. a plurality of sub-pixels provided in a non-transmitting region of the substrate, each sub-pixel including a light-emitting element, the light-emitting element including an anode electrode, a light-emitting layer, and a cathode electrode; a touch sensor disposed in a transmissive region of the substrate, the touch sensor including a touch sensor electrode; an undercut structure disposed in a transmissive region of the substrate, the undercut structure including a plurality of undercuts separating a cathode electrode of the light-emitting element and a touch sensor electrode of the touch sensor; a plurality of inorganic films including a plurality of opening regions provided between the plurality of sub-pixels and the touch sensor; and A transparent display device having a touch sensor, the transparent display device including at least one organic pattern provided on the plurality of inorganic films and overlapping with at least one of the plurality of opening regions.

18. the organic pattern protrudes from the inorganic films provided in the opening region in a region overlapping the touch sensor, and the undercut structure forms an undercut; In the undercut, the organic pattern protrudes toward the sub-pixel beyond the inorganic films provided in an area overlapping the touch sensor, and The transparent display device according to claim 1 or 17, wherein the undercut structure exposes at least a part of a lower surface of the organic pattern in the opening region, and the plurality of inorganic films are not provided under the exposed lower surface.

19. the plurality of inorganic films include a first opening region provided to at least partially overlap an edge region of the touch sensor electrode; the organic pattern includes a first organic pattern provided on a plurality of inorganic films provided in an area overlapping the touch sensor, the first organic pattern being provided to at least partially overlap the first opening area; 18. The transparent display device having a touch sensor according to claim 17, wherein the undercut structure includes a first undercut formed in a region where the first organic pattern overlaps at least a portion of the first opening region.

20. the plurality of inorganic films include a first opening region provided to at least partially overlap an edge region of the touch sensor electrode, and a second opening region provided between the non-transmitting region and the first opening region; the organic pattern includes a second organic pattern provided on a plurality of inorganic films in a region between the first opening region and the second opening region; The undercut structure is a second undercut formed in a region where the second organic pattern overlaps at least a portion of the first opening region; and The transparent display device having a touch sensor according to claim 17 , wherein the second organic pattern includes a third undercut formed in an area overlapping at least a portion of the second opening area.

21. The transparent display device having a touch sensor according to claim 20 , further comprising a dummy touch sensor provided on the second organic pattern and including a dummy touch sensor electrode.

22. The cathode electrode of the light-emitting element, the touch sensor electrode, and the dummy touch sensor electrode are formed in the same layer and made of the same material; or The transparent display device having a touch sensor according to claim 21 , wherein the cathode electrode of the light-emitting element, the touch sensor electrode, and the dummy touch sensor electrode are electrically isolated from each other.

23. The transparent display device having a touch sensor according to claim 21 , wherein the dummy touch sensor electrode is disposed between the cathode electrode and the touch sensor electrode.

24. each of the plurality of undercuts has a closed planar shape; or The transparent display device equipped with a touch sensor according to claim 17 , wherein each of the plurality of undercuts has a planar rectangular shape with rounded corners.

25. at least one sub-pixel disposed on the substrate, the sub-pixel including a cathode electrode, a light-emitting layer, and an anode electrode; a touch sensor including a touch sensor electrode disposed in a transmissive region of the substrate; a transparent region of the substrate and a trench disposed around the touch sensor; the touch sensor electrode and the cathode electrode of the at least one subpixel comprise the same material; the touch sensor electrode is separated from the cathode electrode of the at least one subpixel by the trench; The trench includes an inorganic film including an opening region between the subpixel and the touch sensor, and an organic pattern formed on the inorganic film and overlapping the opening region.

26. further comprising an organic pattern disposed between the touch sensor electrode and the at least one subpixel; The touch display device of claim 25 , wherein the organic pattern includes an overhang portion that overlaps a portion of the trench.

27. the overhang portion and the trench form an undercut; 27. The touch display device of claim 26, wherein the undercut is configured to separate the touch sensor electrode and a cathode electrode of the at least one subpixel.

28. further comprising a first stack of inorganic films disposed below the organic pattern; The touch display device of claim 26 , wherein the organic pattern and the first stack of inorganic films surround the touch sensor electrode in a closed shape.

29. The touch display device of claim 28 , wherein the organic pattern and the first stack of inorganic films have a mushroom shape or an inverse tapered shape in cross section.

30. further comprising a second stack of inorganic films disposed below the touch sensor electrode; The touch display device of claim 28 , wherein the organic pattern is disposed on the second stack of inorganic films or the outer periphery of the first stack of inorganic films.

31. a first undercut disposed below a first overhanging portion of the organic pattern; and a second undercut disposed below a second overhang portion of the organic pattern; The touch display device of claim 28 , wherein the first undercut and the second undercut are both disposed between the touch sensor electrode and the at least one sub-pixel.

32. further comprising a dummy touch sensor electrode disposed on the organic pattern; 27. The touch display device of claim 26, wherein the dummy touch sensor electrode, the touch sensor electrode, and the cathode electrode of the at least one subpixel comprise the same material and are electrically isolated from each other.

33. The organic pattern is a first overhang portion disposed on the first surface of the first stack of inorganic membranes; and a second overhang portion disposed on a second surface of the first stack of inorganic films, the second surface being different from the first surface; The touch display device of claim 26 , wherein the first overhanging portion is disposed closer to the touch sensor electrode than the second overhanging portion.

34. The touch display device of claim 26 , wherein the trench and the organic pattern form two concentric rings surrounding the touch sensor electrode.

35. further comprising a dummy touch sensor electrode disposed in the trench; The touch display device of claim 26 , wherein the dummy touch sensor electrodes are spaced apart from the touch sensor electrodes.

36. The touch display device of claim 35 , wherein the dummy touch sensor electrode comprises the same material as the cathode electrode and is disposed on an inorganic film.

37. The touch display device of claim 35 , wherein the dummy touch sensor electrodes are electrically connected to a power line through a power connection electrode disposed under the overhanging portion of the organic pattern.

38. The touch display device according to claim 37 , wherein the power supply connecting electrode is disposed in a layer below a layer on which the touch sensor electrode is provided and a layer on which the cathode electrode is provided.

39. 38. The touch display device of claim 37, wherein the power connection electrode is in direct contact with a first stack of inorganic films disposed under the organic pattern.

40. at least one sub-pixel disposed on the substrate, the sub-pixel including a cathode electrode, a light-emitting layer, and an anode electrode; a touch sensor including a touch sensor electrode disposed in a transmissive region of the substrate; an inorganic film including an opening region provided between the subpixel and the touch sensor; and an organic pattern formed on the inorganic film so as to overlap the opening region; the organic pattern is disposed in a transparent area of ​​the substrate and around the touch sensor; the touch sensor electrode and the cathode electrode of the at least one subpixel comprise the same material; The touch sensor electrode is separated from the cathode electrode of the at least one sub-pixel by the organic pattern.

41. the organic pattern protrudes from a plurality of inorganic films provided in an area overlapping the touch sensor in the opening area, and the trench forms an undercut; In the undercut, the organic pattern protrudes toward the sub-pixel beyond the inorganic films provided in an area overlapping the touch sensor, and The touch display device of claim 25 , wherein the trench exposes at least a portion of the bottom surface of the organic pattern in the opening region, and the plurality of inorganic films are not provided under the exposed bottom surface.

42. the organic pattern protrudes from a plurality of inorganic films provided in an area overlapping the touch sensor in the opening area, and the touch display device includes an undercut; In the undercut, the organic pattern protrudes toward the sub-pixel beyond the inorganic films provided in an area overlapping the touch sensor, and The touch display device of claim 40 , wherein the touch display device exposes at least a portion of the bottom surface of the organic pattern in the opening region, and does not include the plurality of inorganic films under the exposed bottom surface.

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