Transparent display device

Abstract

A transparent display device according to an embodiment of the present invention includes: a substrate having a display area and a non-display area surrounding the display area, wherein a transmissive area and a plurality of sub-pixels are arranged in the display area; a black matrix arranged on the substrate and located between the plurality of sub-pixels and the transmissive area and between the plurality of sub-pixels; a main touch electrode partially overlapping the black matrix; and an auxiliary touch electrode extending from the main touch electrode and arranged in the transmissive area.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2024-0176312, filed on December 2, 2024, which is incorporated herein by reference as if fully set forth herein. Technical Field

[0003] This invention relates to a transparent display device. Background Technology

[0004] With the advancement of the information age, the demand for display devices for displaying images has increased in various forms. As a result, various types of display devices have recently been used, such as liquid crystal display (LCD) devices, plasma display panel (PDP) devices, quantum dot light-emitting display (QLED) devices, and organic light-emitting display (OLED) devices.

[0005] Meanwhile, research on transparent display devices is being actively conducted recently, in which users can see objects or images on the opposite side of the display device.

[0006] A transparent display device includes a display area and a non-display area for displaying images, and the display area may include a transmissive area capable of transmitting external light. This type of transparent display device has the problem of making touch difficult due to the transmissive area. Summary of the Invention

[0007] One aspect of the present invention is to provide a transparent display device that enables touch while minimizing the reduction in transmittance.

[0008] Furthermore, one aspect of the present invention is to provide a transparent display device capable of improving touch sensitivity.

[0009] Furthermore, one aspect of the present invention is to provide a transparent display device that can be implemented over a large area while minimizing the increase in bezel size.

[0010] Furthermore, one aspect of the present invention is to provide a transparent display device that can reduce production energy through process optimization.

[0011] The problems solved by the examples of the present invention are not limited to those described above. Other problems not mentioned will become apparent to those skilled in the art to which the spirit of the present invention pertains from the following description.

[0012] A transparent display device according to an embodiment of the present invention includes: a substrate having a display area and a non-display area surrounding the display area, wherein a transmissive area and a plurality of sub-pixels are arranged in the display area; a black matrix arranged on the substrate and located between the plurality of sub-pixels and the transmissive area and between the plurality of sub-pixels; a main touch electrode partially overlapping the black matrix; and an auxiliary touch electrode extending from the main touch electrode and arranged in the transmissive area. Attached Figure Description

[0013] The accompanying drawings, which provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings:

[0014] Figure 1 This is a plan view illustrating a transparent display device according to an embodiment of the present invention.

[0015] Figure 2 This is a planar schematic diagram illustrating the structure of the touch electrode of a transparent display device according to an embodiment of the present invention.

[0016] Figure 3 yes Figure 2 An enlarged view of part A.

[0017] Figure 4 It shows along Figure 3 A cross-sectional view of an example cut from I-I'.

[0018] Figure 5 This is a perspective view showing a transparent display device according to a second embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram showing the transparent display panel of a transparent display device according to a second embodiment of the present invention.

[0020] Figure 7 This is a planar schematic diagram that partially illustrates the structure of the touch electrode of a transparent display device according to a second embodiment of the present invention.

[0021] Figure 8 This is a planar schematic diagram showing a pixel of a transparent display device according to a second embodiment of the present invention.

[0022] Figure 9 It shows along Figure 8 A cross-sectional view of an example section taken from section II-II'.

[0023] Figure 10 It shows along Figure 5 A cross-sectional view of an example section taken from section Ⅲ-Ⅲ'.

[0024] Figure 11 This is a schematic diagram showing a transparent display panel including touch electrodes of a transparent display device according to a second embodiment of the present invention.

[0025] Figure 12 yes Figure 7 A magnified view of part B.

[0026] Figure 13 yes Figure 7 A magnified view of part C.

[0027] Figure 14 It shows along Figure 13 A partial cross-sectional view of an example taken from section IV-IV'.

[0028] Figure 15 It shows along Figure 13 A partial cross-sectional view of another example taken from section IV-IV'. Detailed Implementation

[0029] Referring now to embodiments of the invention, some examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts.

[0030] The advantages, features, and implementation methods of this invention will be explained by the following embodiments described with reference to the accompanying drawings. However, this invention may be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the disclosure of this invention will be thorough and complete, and will fully convey the scope of this invention to those skilled in the art.

[0031] The shapes, sizes, proportions, angles, and quantities disclosed in the accompanying drawings used to describe embodiments of the present invention are merely examples, and therefore the present invention is not limited to the illustrated details.

[0032] Similar reference numerals refer to similar elements throughout. In the following description, detailed descriptions of related known functions or constructions will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the focus of the invention.

[0033] In cases where terms such as "comprising," "having," or "including" are used as described in this invention, an additional part may be added unless "only" is used. Singular terms may include plural forms unless otherwise specified.

[0034] When interpreting elements, elements are interpreted as including a range of error, even though this is not explicitly described.

[0035] When describing positional relationships, such as when the positional relationship between two parts is described as "on top of", "above", "below", or "beside", one or more other parts can be placed between the two parts, unless "exactly" or "directly" is used.

[0036] When describing temporal relationships, such as when time sequence is described as “after,” “following,” “next,” or “before,” discontinuous situations may be included unless “exactly” or “directly” is used.

[0037] It will be understood that although the terms “first,” “second,” etc., may be used herein to describe the elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from other elements. For example, without departing from the scope of the invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0038] The “X-axis direction,” “Y-axis direction,” and “Z-axis direction” should not be interpreted solely by their geometric relationship of being perpendicular to each other, but rather can have a wider range of directions within the functional range of the elements of the present invention.

[0039] The term "at least one" should be understood as any and all combinations including one or more of the relevant listed items. For example, "at least one of the first, second, and third items" means: a combination of all items proposed from two or more of the first, second, and third items; and the first, second, or third item alone.

[0040] The features of the various embodiments of the present invention can be combined or integrated with each other, either partially or entirely, and can be technically interoperable and driven in various ways, as will be fully understood by those skilled in the art. The embodiments of the present invention can be implemented independently of each other, or can be implemented together in a mutually dependent relationship.

[0041] In the following, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0042] Figure 1 This is a plan view illustrating a transparent display device according to an embodiment of the present invention.

[0043] In the following text, the X-axis direction is indicated based on Figure 1 The horizontal direction (or the direction parallel to the gate line) of the transparent display device, the Y-axis direction represents the direction based on Figure 1 The vertical direction (or the direction parallel to the data line) of the transparent display device, and the Z-axis direction represents the thickness direction (or height direction) of the transparent display device 100.

[0044] The following description is based on the fact that the transparent display device 100 according to one embodiment of the present invention is an organic light-emitting display device, but is not limited thereto. That is, the transparent display device according to one embodiment of the present invention can be implemented as any one of a liquid crystal display device, a plasma display device, a quantum dot light-emitting diode device, an electrophoretic display device, and an organic light-emitting display device.

[0045] Reference Figure 1 A transparent display device 100 according to one embodiment of the present invention may include a transparent display panel, a source driver integrated circuit (hereinafter referred to as IC) 130, a flexible film 140, a circuit board 150, and a timing controller 160.

[0046] The transparent display panel may include a substrate 110 and an encapsulation film 120 (such as...). Figure 4 (As shown).

[0047] The substrate 110 may include thin-film transistors, and may be a transistor array substrate, a lower substrate, a base substrate, or a first substrate. The substrate 110 may be a transparent glass substrate or a transparent plastic substrate. The substrate 110 may include a display area DA and a non-display area NDA.

[0048] The display area DA is the area where an image is displayed, and can be a pixel array area, an active area, a pixel array unit, a display unit, or a screen. For example, the display area DA can be located in the center of a display panel. The display area DA may include a transmissive area TA and multiple pixels P (see...). Figure 3 ).

[0049] The encapsulation film 120 can be an upper substrate, a second substrate, or a counter substrate. The encapsulation film 120 can be a plastic film or a glass substrate. After the light-emitting element is formed on the substrate 110, the encapsulation film 120 (or the counter substrate) can be sequentially formed on the light-emitting element. The substrate 110 and the encapsulation film 120 can be made of transparent materials.

[0050] The gate driver GD provides a gate signal to the gate line according to the gate control signal input from the timing controller 160. The gate driver GD can be formed as an in-panel gate driver GIP in a non-display area NDA on either outer side of the display area DA of the transparent display panel. Optionally, the gate driver GD can be made of a driver chip mounted on a flexible film and attached to the non-display areas NDA located on both outer sides of the display area DA of the display panel via a TAB (tape auto-bonding) method.

[0051] The non-display area NDA can be an area where no image is displayed, and can be a peripheral circuit area, signal supply area, non-active area, or border area. The non-display area NDA can be configured to surround the display area DA. That is, the non-display area NDA can be set to surround the display area DA. The pads used to provide power and / or signals to output the image to the pixel P located in the display area DA can be located in the non-display area NDA.

[0052] The source driver IC 130 receives digital video data and source control signals from the timing controller 160. Based on the source control signals, the source driver IC 130 converts the digital video data into analog data voltage and provides the analog data voltage to the data lines. When the source driver IC 130 is manufactured as a driver chip, it can be packaged in a flexible film 140 using either a chip-on-film (COF) method or a chip-on-plastic (COP) method.

[0053] Pads, such as data pads, can be formed in the non-display area NDA. Lines connecting the pads to the source driver IC 130 and lines connecting the pads to the circuit board 150 can be formed in the flexible film 140. The flexible film 140 can be attached to the pads using an anisotropic conductive film, thereby allowing the pads to be connected to the lines of the flexible film 140.

[0054] Circuit board 150 can be attached to flexible film 140. Multiple circuits implemented as driver chips can be packaged in circuit board 150. For example, timing controller 160 can be packaged in circuit board 150. Circuit board 150 can be a printed circuit board or a flexible printed circuit board.

[0055] The timing controller 160 receives digital video data and timing signals from an external system board via a cable from the circuit board 150. Based on the timing signals, the timing controller 160 generates a gate control signal for controlling the operating timing of the gate driver GD and a source control signal for controlling the source driver IC 130. The timing controller 160 provides the gate control signal to the gate driver GD and the source control signal to the source driver IC 130.

[0056] Pads such as power pads and data pads can be formed in the non-display area of ​​the transparent display panel. Lines connecting the pads to the source driver IC 130 and lines connecting the pads to the circuit board 150 can be formed in the flexible film 140. The flexible film 140 can be attached to the pads using an anisotropic conductive film, thereby allowing the pads to be connected to the lines of the flexible film 140.

[0057] A transparent display device 100 according to one embodiment of the present invention may further include a printed circuit board 220 equipped with a touch driver 210. The touch driver 210 is used to sense touches from a plurality of touch electrodes disposed on the transparent display panel or to provide touch drive signals. For example, the touch electrodes may include a plurality of main touch electrodes MTE and a plurality of auxiliary touch electrodes STE (see...). Figure 3 Multiple touch electrodes can be connected to multiple lower pads formed on substrate 110, and the multiple lower pads can be connected to a printed circuit board 220 equipped with touch driver 210 via multiple lines. Printed circuit board 220 can be disposed adjacent to flexible film 140 (source driver IC 130 is mounted on flexible film 140). For example, printed circuit board 220 can be placed at the edge of circuit board 150, such as... Figure 1 As shown. However, the present invention is not limited thereto; the printed circuit board 220 may be placed in the central area of ​​the circuit board 150, or in other areas other than the central area and the edges.

[0058] Figure 2 This is a plan view illustrating the structure of the touch electrodes of a transparent display device according to an embodiment of the present invention. Figure 3 yes Figure 2 A magnified view of part A. Figure 4 It shows along Figure 3 A cross-sectional view of an example section taken from section I-I'.

[0059] Reference Figure 2 According to one embodiment of the present invention, the transparent display device 100 can sense touch by being provided with touch electrodes. For example, when a user's finger or a stylus used by the user comes into contact with the transparent display device 100 according to one embodiment of the present invention, the transparent display device 100 can sense the user's touch.

[0060] Since the transparent display device 100 according to one embodiment of the present invention can have transparent display panels arranged mutually, some of the plurality of touch electrodes can be included in the touch driving electrodes, and other touch electrodes can be included in the touch receiving electrodes. That is, the transparent display panel can include touch driving electrodes and touch receiving electrodes.

[0061] According to one example, the multiple touch electrodes may include multiple main touch electrodes (MTEs) and multiple auxiliary touch electrodes (STEs). The multiple main touch electrodes (MTEs) and multiple auxiliary touch electrodes (STEs) may be disposed on the light-emitting element layer E of the substrate 110. Figure 4 (as shown) on top.

[0062] Multiple main touch electrodes (MTEs) may include multiple first main touch electrodes (MTXs) and multiple second main touch electrodes (MRXs). According to one example, the multiple first main touch electrodes (MTXs) may be touch driving electrodes, and the multiple second main touch electrodes (MRXs) may be touch receiving electrodes. However, the invention is not limited thereto.

[0063] Multiple auxiliary touch electrodes STE may include multiple first auxiliary touch electrodes STE1 ( Figure 3 (as shown) and multiple second auxiliary touch electrodes STE2 ( Figure 3 (As shown). A plurality of first auxiliary touch electrodes STE1 can be connected to a plurality of first main touch electrodes MTX. For example, each of the plurality of first auxiliary touch electrodes STE1 can be electrically connected to each of the plurality of first main touch electrodes MTX, or two or more first auxiliary touch electrodes STE1 can be electrically connected to one first main touch electrode MTX. A plurality of second auxiliary touch electrodes STE2 can be connected to a plurality of second main touch electrodes MRX. For example, each of the plurality of second auxiliary touch electrodes STE2 can be electrically connected to each of the plurality of second main touch electrodes MRX, or two or more second auxiliary touch electrodes STE2 can be electrically connected to one second main touch electrode MRX.

[0064] like Figure 2 As shown, the transparent display panel (or substrate 110) may include a first main touch electrode MTX spaced along a first direction (e.g., the Y-axis direction) and a second main touch electrode MRX extending along a second direction different from the first direction (e.g., the X-axis direction).

[0065] The transparent display panel (or substrate 110) may be provided with at least two first main touch electrodes MTX and at least two second main touch electrodes MRX. For example... Figure 2 As shown, multiple first main touch electrodes (MTX) and multiple second main touch electrodes (MRX) can be disposed in the touch area TUA. In the following text, for ease of explanation, it will be referred to as... Figure 2 The transparent display panel shown, equipped with three first main touch electrodes (MTX) and two second main touch electrodes (MRX), is described as an example.

[0066] like Figure 2 As shown, the touch area TUA may include a first touch area TUA1, another first touch area TUA1', and yet another first touch area TUA1'". Three first main touch electrodes MTX may be arranged in each of the first touch area TUA1, the other first touch area TUA1', and yet another first touch area TUA1'". The first touch area TUA1, the other first touch area TUA1', and yet another first touch area TUA1' may be spaced apart from each other in a second direction (X-axis direction).

[0067] The touch area TUA may also include a second touch area TUA2 and another second touch area TUA2'. Each of the two second main touch electrodes MRX may be disposed in the second touch area TUA2 and the other second touch area TUA2'. The second touch area TUA2 and the other second touch area TUA2' may be spaced apart from each other in a first direction (Y-axis direction).

[0068] Each first main touch electrode MTX can be connected to the touch driver 210 (or to multiple pads 201 of the touch driver 210) via a touch drive electrode line TXL. Furthermore, each second main touch electrode MRX can be connected to the touch driver 210 (or to multiple pads 201 of the touch driver 210) via a touch receive electrode line RXL.

[0069] For example, each of the plurality of first main touch electrodes MTX in each of the first touch area TUA1, another first touch area TUA1' and yet another first touch area TUA1" can be connected to the touch driver 210 (or to the plurality of pads 201 connected to the touch driver 210) via the first touch drive electrode line TXL1 to the third touch drive electrode line TXL3.

[0070] For example, the first main touch electrode MTX in the first touch area TUA1 may include a 1a sub-touch driving electrode STX1a, a 1b sub-touch driving electrode STX1b, and a 1c sub-touch driving electrode STX1c. The 1a sub-touch driving electrodes STX1a, STX1b, and STX1c may be spaced apart from each other along a first direction (Y-axis direction). The 1a sub-touch driving electrode STX1a may be connected to the first touch driving electrode line TXL1 via a 1a touch line STXL1a. The 1b sub-touch driving electrode STX1b may be connected to the first touch driving electrode line TXL1 via a 1b touch line STXL1b. The 1c sub-touch driving electrode STX1c may be connected to the first touch driving electrode line TXL1 via a 1c touch line STXL1c. Therefore, the 1a sub-touch driving electrodes STX1a, STX1b, and STX1c may be electrically connected to each other in the non-display area NDA. Touch lines 1a (STXL1a), 1b (STXL1b), and 1c (STXL1c) can be arranged in parallel along the first direction (Y-axis direction).

[0071] The first main touch electrode MTX in another first touch area TUA1' may include a 2a sub-touch driving electrode STX2a, a 2b sub-touch driving electrode STX2b, and a 2c sub-touch driving electrode STX2c. The 2a, 2b, and 2c sub-touch driving electrodes STX2a and STX2c may be spaced apart from each other along a first direction (Y-axis direction). The 2a sub-touch driving electrode STX2a may be connected to the second touch driving electrode line TXL2 via a 2a touch line STXL2a. The 2b sub-touch driving electrode STX2b may be connected to the second touch driving electrode line TXL2 via a 2b touch line STXL2b. The 2c sub-touch driving electrode STX2c may be connected to the second touch driving electrode line TXL2 via a 2c touch line STXL2c. Therefore, the 2a, 2b, and 2c sub-touch driving electrodes STX2a, STX2b, and STX2c sub-touch driving electrodes may be electrically connected to each other in the non-display area NDA. Touch lines 2a (STXL2a), 2b (STXL2b), and 2c (STXL2c) can be arranged in parallel along the second direction (X-axis direction).

[0072] The first main touch electrode MTX in another first touch area TUA1” may include a 3a sub-touch driving electrode STX3a, a 3b sub-touch driving electrode STX3b, and a 3c sub-touch driving electrode STX3c. The 3a sub-touch driving electrodes STX3a, STX3b, and STX3c may be arranged spaced apart from each other along a first direction (Y-axis direction). The 3a sub-touch driving electrode STX3a may be connected to the third touch driving electrode line TXL3 via the 3a touch line STXL3a. The 3b sub-touch driving electrode STX3a… 3b can be connected to the third touch drive electrode line TXL3 via touch line STXL3b. 3c sub-touch drive electrode STX3c can be connected to the third touch drive electrode line TXL3 via touch line STXL3c. Therefore, sub-touch drive electrodes STX3a, STX3b, and STX3c can be electrically connected to each other in the non-display area NDA. The third touch lines STXL3a, STXL3b, and STXL3c can be arranged parallel to each other along the second direction (X-axis direction).

[0073] A transparent display device 100 according to an embodiment of the present invention is provided, such that sub-touch driving electrodes in each of a first touch area TUA1, another first touch area TUA1', and yet another first touch area TUA1'' are connected to touch driving electrode lines (e.g., first touch driving electrode lines TXL1) in a non-display area NDA via multiple touch lines (e.g., touch line STXL1a) arranged along a second direction (X-axis direction), such that compared to the case where sub-touch driving electrodes in the display area DA (or touch area TUA) are connected to each other via multiple touch lines arranged along a first direction (Y-axis direction), the reduction in transmittance of the transmissive area TA can be minimized while achieving touch.

[0074] If the sub-touch driving electrodes in each of the first touch area TUA1, another first touch area TUA1', and yet another first touch area TUA1" are connected to each other by multiple touch lines arranged along the first direction (Y-axis direction), then there will be a portion where multiple touch lines and sub-touch driving electrodes intersect and overlap. In this case, the touch load can be increased.

[0075] Therefore, the transparent display device 100 according to one embodiment of the present invention is provided with the following structure: the sub-touch driving electrodes in each of the first touch area TUA1, another first touch area TUA1' and yet another first touch area TUA1' are connected to each other in the non-display area NDA by multiple touch lines (e.g., 1a touch line STXL1a) and touch driving electrode lines (e.g., first touch driving electrode line TXL1) arranged in the second direction (X-axis direction), thereby preventing the multiple touch lines and sub-touch driving electrodes from crossing and overlapping, thereby preventing the touch load from increasing.

[0076] Simultaneously, the second main touch electrode MRX in the second touch area TUA2 may include a first touch receiving electrode RX1. The first touch receiving electrode RX1 can be connected to the touch driver 210 (or to a plurality of pads 201 connected to the touch driver 210) via a first touch receiving electrode line RXL1. The second main touch electrode MRX in another second touch area TUA2' may include a second touch receiving electrode RX2. The second touch receiving electrode RX2 can be connected to the touch driver 210 (or to a plurality of pads 201 connected to the touch driver 210) via a second touch receiving electrode line RXL2. The first touch receiving electrode RX1 and the second touch receiving electrode RX2 may be configured to extend along a second direction (X-axis direction) and be spaced apart from each other in a first direction (Y-axis direction).

[0077] like Figure 2As shown, a portion of the first touch receiving electrode RX1 may be disposed between the 1a sub-touch driving electrodes STX1a and 1b sub-touch driving electrodes STX1b of the first main touch electrode MTX, which are spaced apart from each other. A portion of the second touch receiving electrode RX2 may be disposed between the 1b sub-touch driving electrodes STX1b and 1c sub-touch driving electrodes STX1c of the first main touch electrode MTX, which are spaced apart from each other.

[0078] The first main touch electrode MTX and the second main touch electrode MRX can be arranged in various structures on the transparent display panel (or substrate 110), as long as they can sense the user's touch.

[0079] Simultaneously, a second main touch electrode MRX can be longitudinally arranged along a second direction (X-axis direction) between two sub-touch driving electrodes (e.g., sub-touch driving electrode STX1a 1a and sub-touch driving electrode STX1b 1b). Therefore, a second touch area TUA2 can be provided in a stripe shape. According to one example, the length of the second direction (X-axis direction) of the second main touch electrode MRX can be formed to be greater than the length of the second direction (X-axis direction) of the sub-touch driving electrode (e.g., sub-touch driving electrode STX1a 1a). For example, the length of the second direction (X-axis direction) of the second main touch electrode MRX can be formed to be the same as or similar to the length of the second direction (X-axis direction) of three sub-touch driving electrodes (e.g., sub-touch driving electrode STX1a 1a, sub-touch driving electrode STX2a 2a, and sub-touch driving electrode STX3a) arranged in a column along the second direction (X-axis direction).

[0080] In contrast, the sub-touch driving electrodes (e.g., sub-touch driving electrodes STX1a, STX1b, and STX1c) disposed in the first touch area TUA1 can be arranged to be spaced apart from each other along a first direction (Y-axis direction). Therefore, the first touch area TUA1 can be provided in a split form.

[0081] Meanwhile, as the area of ​​the transparent display device increases, the length in the second direction (X-axis direction) can be increased. Therefore, the length of the transparent display panel (or substrate 110) in the second direction (X-axis direction) can also be increased.

[0082] When the length of the transparent display panel increases in the second direction (X-axis direction), the length of a second main touch electrode MRX disposed along the second direction (X-axis direction) can also increase in the second direction (X-axis direction).

[0083] As the length of the second main touch electrode MRX increases in the second direction (X-axis direction), the magnitude and sensitivity of the touch sensing signal generated from the second main touch electrode MRX and transmitted to the touch driver 210 can vary depending on the location where the touch occurs.

[0084] To prevent this situation, the transparent display device 100 according to a second embodiment of the present invention may have at least two second main touch electrodes MRX arranged in a row along a second direction (X-axis direction). In this case, each of the at least two second main touch electrodes MRX may be formed to have the same or similar length in the second direction (X-axis direction) as the length of the three sub-touch driving electrodes arranged in a row along the second direction (X-axis direction).

[0085] In the following description, the area where the first main touch electrode MTX and the second main touch electrode MRX are provided is referred to as the touch area TUA, and the area where the first main touch electrode MTX and the second main touch electrode MRX are not provided is referred to as the non-touch area. For example, the non-touch area can be the non-display area NDA.

[0086] Meanwhile, each sub-touch drive electrode of the first main touch electrode MTX in the first touch area TUA1 can be connected to the touch driver 210 through a first touch drive electrode line TXL1.

[0087] As the area of ​​the transparent display device increases, the distance between the first main touch electrode MTX in the first touch area TUA1 and the touch driver 210 can be increased, and the length of the first main touch electrode MTX in the first touch area TUA1 can be increased.

[0088] Therefore, the magnitude of the touch driving signal can vary depending on the position of the first main touch electrode MTX, thereby the magnitude and sensitivity of the touch sensing signal can vary depending on the position of the first main touch electrode MTX (or sub-touch driving electrodes STX1a, STX1b, STX1c) in the first touch area TUA1.

[0089] To prevent this situation, in a transparent display device 100 according to an embodiment of the present invention, such as Figure 2 As shown, each of the first touch lines STXL1a, STXL1b, STXL1c connected to the sub-touch drive electrodes STX1a, STX1b, STX1c located in the first touch area TUA1 of the first main touch electrode MTX can extend along the second direction (X-axis direction).

[0090] In this scenario, the first touch lines STXL1a, STXL1b, and STXL1c can be connected to the first touch drive electrode line TXL1 in the non-touch area (or non-display area NDA), and the first touch drive electrode line TXL1 can be connected to the touch driver 210. As a result, as... Figure 2 As shown, the first touch lines STXL1a, STXL1b, and STXL1c can be arranged in parallel while extending along the second direction (X-axis direction).

[0091] This structure can be equivalently applied to the second touch lines STXL2a, STXL2b, STXL2c and the third touch lines STXL3a, STXL3b, STXL3c. However, due to its basis... Figure 2 The sub-touch driving electrodes STX2a, STX2b, and STX2c in another first touch area TUA1' are arranged closer to the non-display area NDA below the substrate 110 than the sub-touch driving electrodes STX1a, STX1b, and STX1c in the first touch area TUA1. Therefore, the length of each of the second touch lines STXL2a, STXL2b, and STXL2c can be shorter than the length of each of the first touch lines STXL1a, STXL1b, and STXL1c. Furthermore, since the sub-touch driving electrodes STX3a, STX3b, and STX3c in yet another first touch area TUA1" are arranged closer to the non-display area NDA below the substrate 110 than the sub-touch driving electrodes STX2a, STX2b, and STX2c in the other first touch area TUA1', the length of each of the third touch lines STXL3a, STXL3b, and STXL3c can be set to be shorter than the length of each of the second touch lines STXL2a, STXL2b, and STXL2c.

[0092] like Figure 2 As shown, since each of the first touch lines STXL1a, STXL1b, and STXL1c has the same length, the resistance characteristics of each of the first touch lines STXL1a, STXL1b, and STXL1c can become the same or similar. Therefore, the characteristics of the touch drive signals supplied to the sub-touch drive electrodes can become the same or similar. This can be equivalently applied to the sub-touch drive electrodes connected to each of the second touch lines STXL2a, STXL2b, and STXL2c, the sub-touch drive electrodes connected to each of the third touch lines STXL3a, STXL3b, and STXL3c, and the third touch lines STXL3a, STXL3b, and STXL3c.

[0093] Each of the second main touch electrodes MRX can be connected to a touch receiving electrode line RXL extending along the second direction (X-axis direction). The touch receiving electrode line RXL can also extend along the second direction (X-axis direction) in the touch area TUA.

[0094] When at least two second main touch electrodes MRX are arranged along a second direction (X-axis direction), a touch receiving electrode line RXL extending along the second direction (X-axis direction) can be connected to each of the at least two second main touch electrodes MRX. For example, in Figure 2 In the touch area TUA of the transparent display panel shown, each of the first touch receiving electrode line RXL1 and the second touch receiving electrode line RXL2 can be arranged in parallel while extending along the second direction (X-axis direction).

[0095] The lengths of the first touch receiving electrode line RXL1 and the second touch receiving electrode line RXL2 may be different from each other. However, the lengths of the first touch receiving electrode line RXL1 and the second touch receiving electrode line RXL2 may be made the same, such that the resistive characteristics of the first touch receiving electrode line RXL1 and the second touch receiving electrode line RXL2 may be the same or similar.

[0096] Meanwhile, the transparent display device 100 according to one embodiment of the present invention may be equipped with a mutual method using a main touch electrode MTE and an auxiliary touch electrode STE, and thus can be implemented as a transparent display device capable of dual-sided touch.

[0097] In the following text, reference will be made to Figure 3 The structure of a plurality of pixels P in a transparent display device 100 according to an embodiment of the present invention is described in detail.

[0098] Reference Figure 3 A transparent display device 100 according to one embodiment of the present invention may include: a substrate 110, the substrate 110 including a transmissive region TA and a plurality of sub-pixels SP; a black matrix BM; a main touch electrode MTE; and an auxiliary touch electrode STE. The black matrix BM is disposed on the substrate 110 and may be disposed between the plurality of sub-pixels SP and the transmissive region TA, and between the plurality of sub-pixels SP. The main touch electrode MTE may partially overlap with the black matrix BM. The auxiliary touch electrode STE may extend from the main touch electrode MTE and be disposed in the transmissive region TA.

[0099] like Figure 3As shown, the main touch electrode MTE may not overlap with each of the plurality of sub-pixels SP. For example, the main touch electrode MTE may include a first main touch electrode MTX and a second main touch electrode MRX, and each of the first main touch electrode MTX and the second main touch electrode MRX may be arranged so as not to overlap with each of the plurality of sub-pixels SP. When the main touch electrode MTE overlaps with the plurality of sub-pixels SP (or the light-emitting area EA of each of the plurality of sub-pixels SP), the light emitted from each of the plurality of sub-pixels SP (or the light-emitting area EA of each of the plurality of sub-pixels SP) interferes with the main touch electrode MTE, thereby reducing light efficiency. Therefore, a transparent display device 100 according to an embodiment of the present invention is provided such that the main touch electrode MTE does not overlap with each of the plurality of sub-pixels SP, thereby preventing a reduction in light efficiency.

[0100] According to one example, the main touch electrode MTE can be configured to partially overlap with the black matrix BM. That is, the main touch electrode MTE can be partially located in the non-emissive region NEA (e.g., the non-emissive area). Figure 4 As shown in the figure. Therefore, a transparent display device 100 according to an embodiment of the present invention is provided, such that the main touch electrode MTE partially overlaps with the black matrix BM, so that the main touch electrode MTE does not cover the transmissive region TA, thereby enabling touch to be performed while minimizing the reduction in transmittance.

[0101] Meanwhile, according to one example, the main touch electrode MTE can be an opaque conductive material. For example, the main touch electrode MTE can be made of a low-resistance metal such as aluminum, copper, or their alloys. According to one example, the auxiliary touch electrode STE can be a transparent conductive material. For example, the auxiliary touch electrode STE can be made of a high-resistance metal such as ITO or IZO. In a transparent display device 100 according to one embodiment of the present invention, an opaque main touch electrode MTE with low resistance can be provided so that it partially overlaps with the black matrix BM. Therefore, the transparent display device 100 according to one embodiment of the present invention can improve touch sensitivity while minimizing the reduction in transmittance.

[0102] Refer again Figure 3 In one example, multiple sub-pixels SP may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be arranged sequentially in a first direction (Y-axis direction). For example... Figure 3 As shown, each of the first sub-pixel SP1 and the third sub-pixel SP3 can be cross-shaped, and the second sub-pixel SP2 can be square. Therefore, as Figure 3As shown, the first sub-pixel SP1 and the third sub-pixel SP3 may have symmetrical shapes, with the second sub-pixel SP2 interposed between them. The first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be contained within a single pixel P. For example, the first sub-pixel SP1 may be a green sub-pixel, the second sub-pixel SP2 may be a red sub-pixel, and the third sub-pixel SP3 may be a blue sub-pixel.

[0103] Meanwhile, another pixel P' adjacent to a pixel P in the second direction (X-axis direction) may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. However, the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 included in the other pixel P' may have an arrangement structure opposite to that of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 included in a pixel P in the first direction (Y-axis direction). However, the arrangement structure of multiple sub-pixels may be changed differently.

[0104] like Figure 3 As shown, a transmission region TA can be surrounded by a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3 included in a pixel P, and by a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3 included in another pixel P'.

[0105] Reference Figure 3 A transparent display device 100 according to one embodiment of the present invention may include an auxiliary touch electrode STE located in the transmissive region TA. According to one example, the auxiliary touch electrode STE may be arranged in a grid shape. Because the auxiliary touch electrode STE is arranged in a grid form, external light can be transmitted through multiple holes formed inside the auxiliary touch electrode STE, thereby minimizing the reduction in transmittance. Furthermore, by having an auxiliary touch electrode STE in the transmissive region TA, the transparent display device 100 according to one embodiment of the present invention may have improved touch sensitivity. Touch signals sensed by the auxiliary touch electrode STE can be transmitted to the touch driver 210 via the main touch electrode MTE.

[0106] Simultaneously, the edges of the auxiliary touch electrode STE can be configured as a closed-loop shape. As a result, the edges of the auxiliary touch electrode STE can be uniformly arranged in a straight shape. If the edges of the auxiliary touch electrode are irregularly arranged with a rough structure, the clarity of the background or image may be reduced due to diffraction of external light. Therefore, in the transparent display device 100 according to an embodiment of the present invention, since the edges of the auxiliary touch electrode STE arranged in the transmission region TA are configured in a closed-loop shape, diffraction phenomena can be minimized or prevented, thereby preventing the degradation of the clarity of the background or image on the back side of the transparent display device.

[0107] In the following text, refer to Figure 4 The structure of each of the multiple sub-pixels SP will be described in detail.

[0108] Reference Figure 4 According to one embodiment of the present invention, a transparent display device 100 may include a buffer layer BL, a circuit element layer 111 (or an inorganic film layer), a thin film transistor 112, an overcoat layer 113, a pixel electrode 114, a dam 115, an organic light-emitting layer 116, a cathode 117, a capping layer 118, and an encapsulation layer 119.

[0109] More specifically, one of the plurality of sub-pixels SP (e.g., the first sub-pixel SP1) may include: a circuit element layer 111 disposed on the upper surface of the buffer layer BL, which includes a gate insulating layer 111a, an interlayer insulating layer 111b, and a passivation layer 111c; an outer coating layer 113 disposed on the circuit element layer 111; a pixel electrode 114 disposed on the outer coating layer 113; a dam 115 covering the edge of the pixel electrode 114; an organic light-emitting layer 116 on the pixel electrode 114 and the dam 115; a cathode 117 on the organic light-emitting layer 116; a capping layer 118 on the cathode 117; and an encapsulation layer 119 on the capping layer 118.

[0110] Thin-film transistors 112 for driving sub-pixels SP may be disposed on circuit element layer 111. Circuit element layer 111 may be referred to as an inorganic film layer. Buffer layer BL may be included in circuit element layer 111 together with gate insulating layer 111a, interlayer insulating layer 111b, and passivation layer 111c. Pixel electrode 114, organic light-emitting layer 116, and cathode 117 may be included in light-emitting element layer E.

[0111] A buffer layer BL may be formed between the substrate 110 and the gate insulating layer 111a to protect the thin-film transistor 112. The buffer layer BL may be disposed on the entire surface (or front surface) of the substrate 110. The buffer layer BL can be used to prevent material contained in the substrate 110 from diffusing into the transistor layer during the high-temperature process of the thin-film transistor manufacturing process. Optionally, the buffer layer BL may be omitted in some cases.

[0112] According to one example, a thin-film transistor 112 (or driving transistor) may include an active layer 112a, a gate 112b, a source 112c, and a drain 112d.

[0113] The active layer 112a may include a channel region, a drain region, and a source region formed in the thin-film transistor region of the circuit region of the sub-pixel SP. The drain region and the source region may be spaced apart from each other, and the channel region is interposed therebetween.

[0114] The active layer 112a may be formed of a semiconductor material based on any one of amorphous silicon, polycrystalline silicon, oxide and organic materials.

[0115] The gate insulating layer 111a may be formed on the channel region of the active layer 112a. As an example, the gate insulating layer 111a may be formed in an island shape only on the channel region of the active layer 112a, or it may be formed on the entire front surface of the substrate 110 or the buffer layer BL that includes the active layer 112a.

[0116] The gate 112b may be formed on the gate insulating layer 111a to overlap with the channel region of the active layer 112a.

[0117] An interlayer insulating layer 111b may be formed on the gate 112b and the drain and source regions of the active layer 112a. The interlayer insulating layer 111b may be formed on the entire non-light-emitting region NEA (or black matrix region BMA) and the light-emitting region EA, such as... Figure 4 As shown. However, the embodiments of the present invention are not limited thereto. The interlayer insulating layer 111b may be patterned between the drain region of the drain 112d, the gate 112b, and the drain region of the active layer 112a, and may be arranged in an island shape. In addition, it may be patterned between the source region of the source 112c, the gate 112b, and the source region of the active layer 112a, and may be arranged in an island shape.

[0118] The source electrode 112c can be electrically connected to the source region of the active layer 112a through a source contact hole provided in the interlayer insulating layer 111b that overlaps with the source region of the active layer 112a. The drain electrode 112d can be electrically connected to the drain region of the active layer 112a through a drain contact hole provided in the interlayer insulating layer 111b that overlaps with the drain region of the active layer 112a.

[0119] The drain 112d and source 112c can be made of the same metallic material. For example, each of the drain 112d and source 112c can be made of a single metal layer, a single alloy layer, or a multilayer of two or more layers, which may be the same as or different from the structure of the gate.

[0120] Furthermore, the circuit region may also include first and second switching thin-film transistors disposed together with thin-film transistor 112, and a capacitor. Since each of the first and second switching thin-film transistors is disposed on the circuit region (or black matrix region BMA) of the sub-pixel SP to have the same structure as the thin-film transistor 112, its description will be omitted. A capacitor (not shown) may be disposed in the overlapping region between the gate 112b and the source 112c of the thin-film transistor 112, wherein the gate 112b and the source 112c overlap each other and an interlayer insulating layer 111b is inserted between them.

[0121] In addition, to prevent the threshold voltage of the thin-film transistors disposed in the pixel area from shifting due to light, the transparent display panel or substrate 110 may further include a light-shielding layer (not shown) disposed below the active layer 112a of at least one of the thin-film transistors 112, the first switching thin-film transistor, and the second switching thin-film transistor. The light-shielding layer may be disposed between the substrate 110 and the active layer 112a to shield light incident on the active layer 112a through the substrate 110, thereby minimizing changes in the threshold voltage of the transistors due to external light. Furthermore, since the light-shielding layer is disposed between the substrate 110 and the active layer 112a, the thin-film transistors can be prevented from being seen by the user.

[0122] A passivation layer 111c may be disposed on the substrate 110 to cover the pixel area. The passivation layer 111c covers the drain 112d, source 112c and gate 112b of the thin film transistor 112 and the buffer layer BL.

[0123] Meanwhile, a transparent display device 100 according to one embodiment of the present invention can be provided, such that the embankment 115 is arranged on one side of the light-emitting area EA and the other side of the light-emitting area EA. For example, one side of the light-emitting area EA can be represented as... Figure 4 The left-side region adjacent to the left of the luminous area EA. Furthermore, the other side of the luminous area EA can represent the region adjacent to... Figure 4 The right-side region adjacent to the right side of the light-emitting region EA. A passivation layer 111c may be formed over the entire circuit region and the light-emitting region. The passivation layer 111c may be omitted. An outer coating layer 113 may be disposed on the passivation layer 111c.

[0124] An outer coating 113 may be disposed on the substrate 110 to cover the passivation layer 111c. When the passivation layer 111c is omitted, the outer coating 113 may be disposed on the substrate 110 to cover the circuit area. The outer coating 113 may be formed in the entire circuit area where the thin-film transistor 112 is disposed and in the light-emitting area EA. Furthermore, the outer coating 113 may be formed in other non-display areas NDA except for the pad area of ​​the non-display area NDA and in the entire display area DA. For example, the outer coating 113 may include an extension (or extension) extending or expanding from the display area DA to other non-display areas NDA except for the pad area. Therefore, the outer coating 113 may have a relatively wider dimension than the display area DA.

[0125] According to one example, the outer coating 113 can be formed to have a relatively thick thickness, thereby providing a flat surface on the display area DA and the non-display area NDA. For example, the outer coating 113 can be made of organic materials such as photo acrylic, benzocyclobutene, polyimide, and fluoropolymers.

[0126] Refer again Figure 4The pixel electrode 114 can be placed on the outer coating 113. Since the upper surface of the outer coating 113 is set to be flat, the pixel electrode 114 formed on the outer coating 113 can also be provided in a flat shape. In addition, the organic light-emitting layer 116 and the cathode 117 formed on the pixel electrode 114 can also be provided in a flat shape. Since the pixel electrode 114, the organic light-emitting layer 116, and the cathode 117 (i.e., the light-emitting element layer E) are set to be flat in the light-emitting region EA, the thickness of each of the pixel electrode 114, the organic light-emitting layer 116, and the cathode 117 in the light-emitting region EA can be uniformly formed. Therefore, the organic light-emitting layer 116 can emit light uniformly in the light-emitting region EA without deviation.

[0127] Pixel electrode 114 can be connected to the drain or source of thin-film transistor 112 through contact holes passing through outer coating 113 and passivation layer 111c. Each of one edge portion and the other edge portion of pixel electrode 114 can be covered by dike 115.

[0128] According to one example, pixel electrode 114 may comprise a metallic material. Pixel electrode 114 may reflect light emitted from the organic light-emitting layer 116 in each of the plurality of sub-pixels SP toward the upper side of substrate 110, i.e., toward encapsulation film 120 (or opposing substrate).

[0129] Since the transparent display device 100 according to one embodiment of the present invention is a top-emitting type and the light emitted from the organic light-emitting layer 116 must be reflected toward the encapsulation film 120 (or the opposing substrate), the pixel electrode 114 can be made of a metallic material with high reflectivity. According to one example, the pixel electrode 114 can be formed of a metallic material with high reflectivity, such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, and a laminated structure of Ag alloy and ITO (ITO / Ag alloy / ITO). The Ag alloy can be an alloy of silver, palladium, and copper. The pixel electrode 114 can be represented according to a first electrode and an anode.

[0130] The embankment 115 is a non-light-emitting area and can be disposed on one side and the other side of the light-emitting area EA of each of the plurality of sub-pixels SP. For example, the embankment 115 can be located in the non-light-emitting area NEA that overlaps with the circuit area. The circuit area can be an area equipped with thin-film transistors 112. Figure 4As shown, the dam 115 can be formed such that one edge of the pixel electrode 114 of each sub-pixel SP covers the portion connected to the thin-film transistor 112. Furthermore, the dam 115 can be formed to cover the other edge of the pixel electrode 114 of each sub-pixel SP. That is, the dam 115 can partially cover the pixel electrode 114. Therefore, the dam 115 can prevent the pixel electrode 114 and the cathode 117 from contacting in the non-light-emitting area NEA overlapping with the circuit area, and can also prevent the pixel electrode 114 and the cathode 117 from contacting in the non-light-emitting area NEA adjacent to the other side of the light-emitting area EA. The exposed portion of the pixel electrode 114 not covered by the dam 115 can be included in the light-emitting portion (or the light-emitting area EA).

[0131] After forming the dam 115, an organic light-emitting layer 116 may be formed to cover the pixel electrode 114 and a portion of the dam 115. Therefore, the dam 115 may be disposed between the pixel electrode 114 and the organic light-emitting layer 116. The dam 115 may be represented according to a pixel-defining film. According to one example, the dam 115 may comprise organic and / or inorganic materials.

[0132] An organic light-emitting layer 116 may be formed between the pixel electrode 114 and the cathode 117. For example... Figure 4 As shown, according to one example, the organic light-emitting layer 116 may be located in the partial non-light-emitting region NEA and the light-emitting region EA. Since the organic light-emitting layer 116 is disposed between the pixel electrode 114 and the cathode 117, when different voltages are applied to each of the pixel electrode 114 and the cathode 117, an electric field is formed between the pixel electrode 114 and the cathode 117, so that the organic light-emitting layer 116 can emit light.

[0133] In a transparent display device 100 according to an embodiment of the present invention, the organic light-emitting layer 116 may be patterned on each of a plurality of sub-pixels SP. Therefore, each of the organic light-emitting layers 116 in the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be provided with a structure that is disconnected from each other (or a discontinuous structure). As described above, since the first sub-pixel SP1 is a green sub-pixel, the organic light-emitting layer 116 in the first sub-pixel SP1 may be a green light-emitting layer. Since the second sub-pixel SP2 is a red sub-pixel, the organic light-emitting layer 116 in the second sub-pixel SP2 may be a red light-emitting layer. Since the third sub-pixel SP3 is a blue sub-pixel, the organic light-emitting layer 116 in the third sub-pixel SP3 may be a blue light-emitting layer.

[0134] As a result, a transparent display device 100 according to an embodiment of the present invention can be provided, such that the organic light-emitting layer 116 disposed in each of the plurality of sub-pixels SP emits light of different colors. Since the organic light-emitting layer 116 disposed in each of the plurality of sub-pixels SP is configured to emit light of different colors, the transparent display device 100 according to an embodiment of the present invention may not be provided with a color filter.

[0135] A cathode 117 may be formed on the organic light-emitting layer 116. The cathode 117 may be located in the light-emitting region EA and the non-light-emitting region NEA. According to one example, the cathode 117 may not be located in the transmission region TA. Therefore, compared to the case where the cathode is arranged in the transmission region, the transparent display device 100 according to one embodiment of the present invention may have improved transmittance in the transmission region TA. The cathode 117 may be made of at least one of a transparent metallic material and a translucent metallic material.

[0136] Since the transparent display device 100 according to one embodiment of the present invention is formed as a top-emitting type, the cathode 117 can be formed of a transparent metal material (or transparent conductive material) such as ITO or IZO that is capable of transmitting light, or a semi-transparent metal material (or semi-transparent conductive material) such as magnesium Mg, silver Ag, or an alloy of magnesium Mg and silver Ag.

[0137] A capping layer 118 is formed on the cathode 117. The capping layer 118 is used to prevent oxygen or moisture from penetrating into the organic light-emitting layer 116 and the cathode 117. For this purpose, the capping layer 118 may be arranged as a common layer in the light-emitting region EA, the non-light-emitting region NEA, and the transmissive region TA. According to one example, the capping layer 118 may comprise an inorganic film and / or an organic film.

[0138] An encapsulation layer 119 is formed on the capping layer 118. Similar to the capping layer 118, the encapsulation layer 119 is used to prevent oxygen or moisture from penetrating into the organic light-emitting layer 116 and the cathode 117. For this purpose, the encapsulation layer 119 may include at least one inorganic film and at least one organic film.

[0139] At the same time, such as Figure 4 As shown, the encapsulation layer 119 can be located not only in the light-emitting area EA, but also in the non-light-emitting area NEA. The encapsulation layer 119 can be located between the capping layer 118 and the encapsulation film 120 (or the opposing substrate).

[0140] Reference Figure 4 According to one embodiment of the present invention, the transparent display device 100 may further include a black matrix BM, an upper buffer layer UBL, an upper insulating layer UILD, a main touch electrode MTE, an auxiliary touch electrode STE, and an encapsulation film 120 (or a counter substrate).

[0141] A black matrix (BM) can be placed on encapsulation layer 119. The black matrix (BM) is designed to prevent color mixing between adjacent subpixels. According to one example, the black matrix (BM) can be placed at the position corresponding to dike 115. Figure 4 In this diagram, the width of the black matrix BM is shown to be the same as the width of the embankment 115, but is not limited to this. The black matrix BM can be made of a material that absorbs or blocks light. The area where the black matrix BM is arranged can be a black matrix region BMA, and the black matrix region BMA can be a non-emitting region NEA.

[0142] The upper buffer layer UBL can be disposed on the black matrix BM. The upper buffer layer UBL can be provided to cover the black matrix BM. The upper buffer layer UBL can be disposed on the entire lower surface of the encapsulation film 120 (or the opposing substrate). Optionally, the upper buffer layer UBL can be omitted in some cases.

[0143] In a transparent display device 100 according to one embodiment of the present invention, the main touch electrode MTE may be disposed on the black matrix BM. For example, as Figure 4 As shown, the second main touch electrode MRX can be disposed on the black matrix BM. Therefore, the main touch electrode MTE can not overlap with (or interfere with) the transmissive region TA. As described above, since the main touch electrode MTE is made of an opaque, low-resistance metal, the transmittance of the transmissive region TA can be significantly reduced when the main touch electrode MTE overlaps with the transmissive region TA. However, the transparent display device 100 according to an embodiment of the present invention is configured such that the main touch electrode MTE is disposed on the black matrix BM, thus providing a touch electrode without interfering with the transmissive region TA. Therefore, it can be implemented as a touch transparent display device in which the reduction in transmittance is minimized or prevented. Furthermore, since the main touch electrode MTE is disposed on the black matrix BM and therefore does not interfere with the light-emitting region EA, the transparent display device 100 according to an embodiment of the present invention does not have reduced light efficiency. Additionally, since the main touch electrode MTE is made of a low-resistance metal, the transparent display device 100 according to an embodiment of the present invention can have improved touch sensitivity.

[0144] The upper insulating layer UILD can be disposed on the main touch electrode MTE. For example, the upper insulating layer UILD can be configured as a common layer covering the main touch electrode MTE while also covering the entire light-emitting area EA, the non-light-emitting area NEA, and the transmissive area TA. The upper insulating layer UILD is used to prevent oxygen or moisture from penetrating the main touch electrode MTE.

[0145] An auxiliary touch electrode (STE) can be placed on the upper insulating layer (UILD). The auxiliary touch electrode (STE) is used to sense the user's touch. Therefore, the auxiliary touch electrode (STE) can be electrically connected to the main touch electrode (MTE). According to one example, the auxiliary touch electrode (STE) can be arranged in a grid pattern and can be placed in the transmissive region (TA). In a transparent display device 100 according to an embodiment of the present invention, the auxiliary touch electrode (STE) is made of a transparent conductive material, such that the reduction in the transmittance of the transmissive region (TA) can be minimized. Figure 3 As shown, by placing the auxiliary touch electrode STE in each of the plurality of transmissive regions TA, the transparent display device 100 according to one embodiment of the present invention can have improved touch sensitivity.

[0146] Meanwhile, since the auxiliary touch electrode STE is disposed on the upper insulating layer UILD, the transparent display device 100 according to one embodiment of the present invention may have the following structural feature: the auxiliary touch electrode STE is disposed further away from the substrate 110 than the main touch electrode MTE. In the transparent display device 100 according to one embodiment of the present invention, the auxiliary touch electrode STE is positioned further away from the substrate 110 than the main touch electrode MTE, such that the auxiliary touch electrode STE is positioned relatively close to the encapsulation film 120 adjacent to the outside, so that even subtle touches can be detected, thereby maximizing touch sensing.

[0147] The encapsulation film 120 (or opposing substrate) can encapsulate (or seal) the display area DA located on the substrate 110. For example, the encapsulation film 120 can be formed on the upper insulating layer UILD to cover the auxiliary touch electrode STE after its formation. According to one example, the encapsulation film 120 can be composed of multiple layers, such as organic protective layers thicker than metal layers, to improve encapsulation performance. However, it is not limited to this; the encapsulation film 120 can be configured as a single thin layer, thereby detecting even minute touches.

[0148] Unlike typical transparent display devices formed by bonding a lower substrate on which a light-emitting element layer is formed and an upper substrate on which a black matrix is ​​formed, a transparent display device 100 according to an embodiment of the present invention can be formed by sequentially depositing a light-emitting element layer E, an encapsulation layer 119, a main touch electrode MTE, an auxiliary touch electrode STE, and an encapsulation film 120 on a substrate 110. Therefore, since the transparent display device 100 according to an embodiment of the present invention is not equipped with a bonding structure and is therefore easy to manufacture, it can be usefully used as a small to medium-sized transparent display device rather than a large-area transparent display device. For example, the transparent display device 100 according to an embodiment of the present invention can be used as a transparent display device for automotive applications.

[0149] Figure 5This is a perspective view showing a transparent display device according to a second embodiment of the present invention. Figure 6 This is a schematic diagram illustrating a transparent display panel of a transparent display device according to a second embodiment of the present invention. Figure 7 This is a planar schematic diagram that partially illustrates the structure of the touch electrode of a transparent display device according to a second embodiment of the present invention.

[0150] Reference Figures 5 to 7 Apart from the structural change of the transparent display panel, the transparent display device 100 according to the second embodiment of the present invention is similar to the one described above. Figure 1 The display devices are the same. Therefore, the same reference numerals are assigned to the same configurations, and only different configurations will be described below.

[0151] According to Figure 1 In the case of a transparent display device, the light-emitting element layer E, the encapsulation layer 119, the main touch electrode MTE, the auxiliary touch electrode STE, and the encapsulation film 120 can be sequentially deposited and formed on the substrate 110. Therefore, according to Figure 1 In the case of a transparent display device, since the substrate 110 and the encapsulation film 120 are not bonded to each other, not only is manufacturing easy, but it also prevents external impurities from being included inside the transparent display panel during the manufacturing process, thus improving reliability.

[0152] In contrast, based on Figure 5 In the case of a transparent display device, the transparent display panel (TDP) can be disposed in the bonding structure between the substrate 110 and the opposing substrate 120'. Therefore, according to Figure 5 In the case of a transparent display device, the main touch electrode MTE and the auxiliary touch electrode STE can be configured as an in-cell structure arranged between the substrate 110 and the opposing substrate 120'. Furthermore, according to... Figure 5 The transparent display device 100 may be configured such that a substrate 110 and an opposing substrate 120' are manufactured separately and then joined together, thereby increasing the area (or size) of each of the substrate 110 and the opposing substrate 120', making it usable as a large-area transparent display device. (Refer to...) Figure 5 In the transparent display device 100 according to a second embodiment of the present invention, the transparent display panel TDP can be formed by bonding a substrate 110 and an opposing substrate 120', and a plurality of sealing members SLP can be arranged on each side of the substrate 110 and the opposing substrate 120'. The plurality of sealing members SLP are intended to protect a plurality of side contact electrodes SCE (e.g., ...). Figure 10(As shown) to protect it from external impacts and / or moisture penetration. According to one example, multiple side contact electrodes SCE are used to transmit touch signals sensed on the opposing substrate 120' to a touch driver 210 disposed on the substrate 110.

[0153] Reference Figure 6 In the transparent display device 100 according to a second embodiment of the present invention, the substrate 110 may include a display area DA and a non-display area NDA having a plurality of pixels P. The opposing substrate 120' may include a touch area TUA, and the main touch electrode MTE may be disposed in the touch area TUA. Figure 6 As shown, the touch area TUA of the opposing substrate 120' can be formed to correspond to the display area DA disposed on the substrate 110. According to one example, the main touch electrode MTE may include a plurality of first main touch electrodes MTX and a plurality of second main touch electrodes MRX.

[0154] Since the transparent display device 100 according to the second embodiment of the present invention has a large-area transparent display panel TDP, the overall size (or area) of the transparent display panel TDP can be larger than that according to the second embodiment of the present invention. Figure 1 The overall size (or area) of the transparent display device. Therefore, according to Figure 1 Compared to transparent display devices, the opposing substrate 120' can be provided with a larger number of touch areas, a first main touch electrode MTX, and a second main touch electrode MRX.

[0155] For example, the touch area TUA may include six first touch areas TUA spaced apart in a second direction (X-axis direction). Therefore, each of the plurality of first main touch electrodes MTX in each of the six first touch areas can be connected to a plurality of upper pads UPAD disposed on the opposing substrate 120' via the first touch drive electrode line TXL1 to the sixth touch drive electrode line TXL6.

[0156] Additionally, the second touch area TUA2 may be provided with 1a touch receiving electrodes RX1a and 1b touch receiving electrodes RX1b spaced apart from each other in the second direction (X-axis direction). The 1a touch receiving electrode RX1a may be connected to the upper pad UPAD via the 1a touch receiving electrode line RXL1a. The 1b touch receiving electrode RX1b may be connected to the upper pad UPAD via the 1b touch receiving electrode line RXL1b.

[0157] A second touch area TUA2', spaced apart from the second touch area TUA2 in the first direction (Y-axis direction), may be provided with 2a touch receiving electrodes RX2a and 2b touch receiving electrodes RX2b, spaced apart from each other in the second direction (X-axis direction). The 2a touch receiving electrode RX2a may be connected to the upper pad UPAD via a 2a touch receiving electrode line RXL2a. The 2b touch receiving electrode RX2b may be connected to the upper pad UPAD via a 2b touch receiving electrode line RXL2b.

[0158] Each of the plurality of upper pads UPAD disposed in the non-display area NDA of the opposing substrate 120' is electrically connected to each of the plurality of lower pads DPAD disposed on the substrate 110 via each of the plurality of side contact electrodes SCE. The plurality of lower pads DPAD disposed on the substrate 110 are connected to the touch driver 210 via multiple lines. Therefore, touch signals sensed by the main touch electrode MTE and the auxiliary touch electrode STE of the opposing substrate 120' are transmitted (or transferred) to the touch driver 210 disposed on the substrate 110 via the plurality of side contact electrodes SCE.

[0159] The transparent display device 100 according to the second embodiment of the present invention has side contact electrodes SCE disposed on each side of the substrate 110 (or lower substrate) and the opposing substrate 120' (or upper substrate), such that the touch electrode of the opposing substrate 120' (or upper substrate) can be connected to the touch driver 210 of the substrate 110 (or lower substrate) through the side contact electrodes SCE, thereby achieving a large area while minimizing the increase in bezel.

[0160] In the following text, reference will be made to Figure 8 and Figure 9 The structure of a plurality of pixels P in a transparent display device 100 according to a second embodiment of the present invention is described in detail.

[0161] Figure 8 This is a planar schematic diagram showing one pixel of a transparent display device according to a second embodiment of the present invention. Figure 9 It shows along Figure 8 A cross-sectional view of an example section taken from section II-II'.

[0162] In the transparent display device 100 according to a second embodiment of the present invention, the transparent display panel TDP may include a counter substrate 120' and a substrate 110 bonded to the counter substrate 120'. According to one example, the substrate 110 may include a display area DA and a non-display area NDA. The display area DA may be provided with a plurality of pixels P, each pixel P including a transmissive area TA and a plurality of sub-pixels SP. According to one example, the display area DA may include a light-emitting area EA, a non-light-emitting area NEA, and a transmissive area TA.

[0163] According to one example, the display area DA may include gate lines, data lines, pixel drive power lines EVDD, and multiple pixels P. Each of the multiple pixels P may include multiple sub-pixels SP, which may be defined by gate lines GL and data lines DL.

[0164] Reference Figure 8 At least four sub-pixels SP arranged adjacently and configured to emit light of different colors can form a pixel P (or unit pixel). A pixel P may include (but is not limited to) a red sub-pixel, a white sub-pixel, a blue sub-pixel, and a green sub-pixel. A pixel P may consist of three sub-pixels SP arranged adjacently and configured to emit light of different colors. For example, a pixel P may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

[0165] Each of the plurality of sub-pixels SP may include a thin-film transistor and a light-emitting element layer E connected to the thin-film transistor. Each of the plurality of sub-pixels may include a light-emitting layer (or an organic light-emitting layer) interposed between a pixel electrode and a reflective electrode.

[0166] The emissive layers in each of the multiple sub-pixels SP can collectively emit white light. Since the emissive layers in each of the multiple sub-pixels SP collectively emit white light, each of the red, green, and blue sub-pixels can include a color filter CF (or wavelength conversion element CF) that converts white light into different colors of light. In this case, the white sub-pixel may not have a color filter.

[0167] In the transparent display device 100 according to a second embodiment of the present invention, the area provided with a green color filter can be a green sub-pixel or a first sub-pixel, the area provided with a blue color filter can be a blue sub-pixel or a second sub-pixel, the area without a color filter can be a white sub-pixel or a third sub-pixel, and the area provided with a red color filter can be a red sub-pixel or a fourth sub-pixel. When a unit pixel P of the transparent display device 100 according to an embodiment of the present invention includes four sub-pixels, the four sub-pixels can represent a green sub-pixel (or a first sub-pixel SP1), a blue sub-pixel (or a second sub-pixel SP2), a white sub-pixel (or a third sub-pixel SP3), and a red sub-pixel (or a fourth sub-pixel SP4).

[0168] like Figure 8As shown, a plurality of sub-pixels SP may include: a first sub-pixel SP1 and a second sub-pixel SP2 arranged sequentially in a first direction (Y-axis direction) and configured to emit light of different colors; and a third sub-pixel SP3 and a fourth sub-pixel SP4 arranged sequentially in the first direction (Y-axis direction) and configured to emit light of different colors from the first sub-pixel SP1 and the second sub-pixel SP2. The third sub-pixel SP3 and the fourth sub-pixel SP4 may be arranged adjacent to the first sub-pixel SP1 and the second sub-pixel SP2 in a second direction (X-axis direction). Therefore, the transparent display device 100 according to the second embodiment of the present invention may be provided with a quadrilateral structure, wherein the green sub-pixel SP1, the blue sub-pixel SP2, the red sub-pixel SP4, and the white sub-pixel SP3 are arranged adjacent to each other in a clockwise direction. However, it is not limited to this, and the arrangement order of the first sub-pixel SP1, the second sub-pixel SP2, the third sub-pixel SP3, and the fourth sub-pixel SP4 may be changed. In the following, the plurality of sub-pixels SP will be described as being arranged as follows. Figure 8 An instance of the structure in [the document / structure].

[0169] like Figure 8 As shown, the transmissive region TA can be arranged adjacent to the right side of each of the second sub-pixel SP2 and the fourth sub-pixel SP4. The transmissive region TA can be adjacent to the light-emitting region EA. The auxiliary touch electrode STE can be arranged in the transmissive region TA. The auxiliary touch electrode STE can be connected to the main touch electrode MTE. According to one example, the main touch electrode MTE can be arranged to overlap with each of the black matrix BM between the second sub-pixel SP2 and the transmissive region TA, and between the fourth sub-pixel SP4 and the transmissive region TA. For example, as... Figure 8 As shown, the main touch electrode MTE can be arranged to extend in the second direction (X-axis direction) between the second sub-pixel SP2 and the transmissive area TA.

[0170] When a gate signal is input from the gate line using a thin-film transistor, each sub-pixel SP provides a predetermined current to the organic light-emitting element according to the data voltage of the data line. As a result, the light-emitting layer of each sub-pixel can emit light with a predetermined brightness according to the predetermined current.

[0171] Each of the first sub-pixels SP1 to the fourth sub-pixels SP4 may include a light-emitting area EA and a circuit area. The light-emitting area EA of each of the first sub-pixels SP1 to the fourth sub-pixels SP4 may have the same size (or area) or different sizes (or areas).

[0172] Simultaneously, two data lines DL (e.g., second data line DL2 and third data line DL3) extending along the first direction (X-axis direction) can be arranged parallel to each other between the first sub-pixel SP1 and the second sub-pixel SP2, and between the third sub-pixel SP3 and the fourth sub-pixel SP4. The pixel power line EVDD and the first data line DL1 extending along the second direction (X-axis direction) can be arranged to the left of each of the first sub-pixel SP1 and the third sub-pixel SP3.

[0173] Gate lines GL can be arranged above and below each of the transmissive region TA and the plurality of sub-pixels SP. For example, gate lines GL may include a first gate line GL1 and a second gate line GL2. The first gate line GL1 may be arranged to extend above each of the first sub-pixel SP1, the second sub-pixel SP2 and the transmissive region TA along a first direction (Y-axis direction). The second gate line GL2 may be arranged to extend below each of the third sub-pixel SP3, the fourth sub-pixel SP4 and the transmissive region TA along the first direction (Y-axis direction).

[0174] like Figure 8 As shown, the main bridge wiring MBL connected to the main touch electrode MTE can be arranged along each of the first gate line GL1 and the second gate line GL2. According to one example, the main bridge wiring MBL may include a first main bridge wiring MBL1 and a second main bridge wiring MBL2. Although Figure 8 The illustration shows two main bridge connections arranged along each of the first gate line GL1 and the second gate line GL2, but the invention is not limited thereto; if the touch signal from the main touch electrode MTE can be transmitted to the touch driver, then one main bridge connection can be arranged along each of the first gate line GL1 and the second gate line GL2. However, when two main bridge connections are arranged along each of the first gate line GL1 and the second gate line GL2, the resistance can be reduced compared to arranging one main bridge connection along each of the first gate line GL1 and the second gate line GL2, thereby improving touch signal detection. Figure 8 In this diagram, only the main bridge connection MBL is shown extending in the first direction (Y-axis direction) on each of the upper and lower sides of the transmission zone TA. However, the black matrix can be formed to overlap with the main bridge connection MBL on each of the upper and lower sides of the transmission zone TA. In this case, the black matrix can reduce external light reflection caused by the main bridge connection MBL.

[0175] Simultaneously, a reference line RL extending along the first direction (X-axis direction) can be arranged between the second data line DL2 and the third data line DL3. The reference line RL can serve as a sensing line for sensing changes in the characteristics of the driving thin-film transistors and / or the light-emitting element layer externally arranged in the circuit area when pixel P is in a sensing drive mode. According to one example, the data line DL is used to supply data signals to each of a plurality of sub-pixels, thereby driving each of the plurality of sub-pixels. For example, the first data line DL1 is used to drive the first sub-pixel SP1, the second data line DL2 is used to drive the second sub-pixel SP2, the third data line DL3 is used to drive the third sub-pixel SP3, and the fourth data line DL4 is used to drive the fourth sub-pixel SP4.

[0176] In the following text, refer to Figure 4 The structure of each of the multiple sub-pixels SP will be described in detail.

[0177] Reference Figure 9 In the transparent display device 100 according to the second embodiment of the present invention, each of the sub-pixels SP may include: a circuit element layer 111 disposed on the upper surface of the buffer layer BL, including a gate insulating layer 111a, an interlayer insulating layer 111b and a passivation layer 111c; an outer coating layer 113 disposed on the circuit element layer 111; a pixel electrode 114 disposed on the outer coating layer 113; a dam 115; an organic light-emitting layer 116; a cathode 117; a capping layer 118 and an encapsulation layer 119'.

[0178] The cross-sectional structure of the sub-pixel SP of the transparent display device 100 according to the second embodiment of the present invention is similar to the cross-sectional structure of the sub-pixel SP of the transparent display device according to the first embodiment of the present invention. Therefore, the same reference numerals are given the same configuration, and only different configurations will be described below.

[0179] like Figure 9 As shown, a common power line EVSS, a pixel power line EVDD, and a data line DL for providing a common voltage to each of the multiple sub-pixels SP can be arranged between the buffer layer BL and the substrate 110. Furthermore, a light-shielding layer LS can be disposed between the buffer layer BL and the substrate 110 (or the active layer 112a). Therefore, light incident on the active layer 112a through the substrate 110 is blocked by the light-shielding layer LS, thereby minimizing the threshold voltage variation of the transistor caused by external light.

[0180] The organic light-emitting layer 116 can be formed as a common layer disposed on the plurality of sub-pixels SP and the embankment 115. In this case, the organic light-emitting layer 116 can be provided in a series structure, in which multiple light-emitting layers (e.g., a yellow-green light-emitting layer and a blue light-emitting layer) are laminated, and white light can be emitted when an electric field is formed between the pixel electrode 114 and the cathode 117. Therefore, a transparent display device 100 according to the second embodiment of the present invention can be provided, such that the organic light-emitting layer 116 disposed in each of the plurality of sub-pixels SP emits light of the same color.

[0181] For example, the organic light-emitting layer 116 may include multiple stacks that emit light of different colors. According to one embodiment, the organic light-emitting layer 116 may include a first stack, a second stack, and a charge-generating layer (CGL) disposed between the first and second stacks. The light-emitting layer may be configured to emit white light; therefore, each of the plurality of sub-pixels SP may include a color filter CF suitable for the corresponding color.

[0182] The first stacked layer can be disposed on the pixel electrode 114 and can be implemented as a structure in which a hole injection layer (HIL), a hole transport layer (HTL), an emissive layer (EML(B)) and an electron transport layer (ETL) are stacked in sequence.

[0183] The charge generation layer can supply charge to the first and second stacked layers. The charge generation layer may include an N-type charge generation layer for supplying electrons to the first stacked layer and a P-type charge generation layer for supplying holes to the second stacked layer. The N-type charge generation layer may include a metallic material as a dopant.

[0184] The second stack can be disposed on the first stack and can be implemented as a structure in which a hole transport layer (HTL), a yellow-green (YG) light-emitting layer (EML(YG)) and an electron injection layer (EIL) are stacked sequentially.

[0185] In the transparent display device 100 according to a second embodiment of the present invention, since the organic light-emitting layer 116 is configured as a common layer, the first stack, the charge-generating layer, and the second stack can be distributed across a plurality of sub-pixels SP. According to another example, the organic light-emitting layer 116 can be configured as a three-layer or four-layer structure depending on the number of stacked layers.

[0186] A color filter CF matching the color of the corresponding sub-pixel SP can be formed on the opposing substrate 120'. For example, green sub-pixel SP1 can be equipped with a green color filter CF1, blue sub-pixel SP2 can be equipped with a blue color filter CF2, and red sub-pixel SP4 can be equipped with a red color filter CF3. White sub-pixels may not have a color filter because the organic light-emitting layer 116 emits white light.

[0187] The cathode 117 is formed on the organic light-emitting layer 116. The cathode 117 may be a common layer formed together on the sub-pixel SP. The cathode 117 may be formed of a transparent metallic material TCO (or a transparent conductive material) such as ITO or IZO that can transmit light, or a semi-transparent conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag).

[0188] A capping layer 118 is formed on the cathode 117. The capping layer 118 is used to prevent oxygen or moisture from penetrating into the organic light-emitting layer 116 and the cathode 117. For this purpose, the capping layer 118 may be arranged as a common layer in the light-emitting region EA, the non-light-emitting region NEA, and the transmissive region TA. According to one example, the capping layer 118 may comprise an inorganic film and / or an organic film.

[0189] An encapsulation layer 119' is formed on the capping layer 118. The encapsulation layer 119' is used to prevent oxygen or moisture from penetrating into the organic light-emitting layer 116 and the cathode 117. For this purpose, the encapsulation layer 119' may include at least one organic film and at least one inorganic film.

[0190] In the transparent display device 100 according to a second embodiment of the present invention, the encapsulation layer 119' may be disposed not only in the display area DA, but also in the non-display area NDA. According to one example, the encapsulation layer 119' may be disposed between the cathode 117 (and / or the capping layer 118) and the opposing substrate 120'.

[0191] Since the transparent display device 100 according to the second embodiment of the present invention can have a transparent display panel formed by a bonding structure of substrate 110 and opposing substrate 120', the encapsulation layer 119' can be formed of a transparent adhesive material. In this case, since the encapsulation layer of the transparent display device 100 according to the second embodiment of the present invention is made of a different material than the encapsulation layer 119 of the transparent display device according to one embodiment of the present invention, the encapsulation layer can be made of a transparent adhesive material. Figure 9 Reference numeral 119' is used in the accompanying drawings. Because the encapsulation layer 119' is made of a transparent adhesive material, the adhesive strength between the substrate 110 and the opposing substrate 120' can be improved, thereby improving the reliability of the transparent display device 100.

[0192] Meanwhile, since the transparent display device 100 according to the second embodiment of the present invention can form touch electrodes on the opposing substrate 120' (or upper substrate 120') by utilizing the process lines of the substrate 110 (or lower substrate 110), production energy can be reduced through process optimization.

[0193] Refer again Figure 9 According to a second embodiment of the present invention, the transparent display device 100 may include an undercut portion UC, wherein the outer coating layer 113 and the circuit element layer 111 (or inorganic film layer) are partially removed.

[0194] According to one example, the undercut UC can be formed by partially removing each of the interlayer insulating layer 111b and the passivation layer 111c. Figure 9 As shown, the undercut portion UC can be formed in the transmission region TA. That is, the transmission region TA may include the undercut portion UC.

[0195] The undercut portion UC is designed to disconnect the organic light-emitting layer 116 disposed in the transmissive region TA. In a transparent display device 100 according to one embodiment of the present invention, the organic light-emitting layer 116, the cathode 117, and the capping layer 118 are formed after the undercut portion UC is formed, such that the organic light-emitting layer 116 can be disconnected through the undercut portion UC. Therefore, the transparent display device 100 of the second embodiment of the present invention can prevent moisture from penetrating through the organic light-emitting layer 116.

[0196] The undercut portion UC can be formed on both sides of the outer coating 113' disposed in the transmissive region TA. The outer coating 113' disposed in the transmissive region TA is arranged in an island shape spaced apart from the outer coating 113 disposed in the light-emitting region EA, and can therefore be represented as an island OC or a first outer coating. In contrast, the outer coating 113 arranged to overlap with the light-emitting region EA (and / or the non-light-emitting region NEA) is arranged to cover the thin-film transistor 112, and can therefore be represented as an encapsulation OC or a second outer coating.

[0197] Reference Figure 9 In the transparent display device 100 according to the second embodiment of the present invention, the organic light-emitting layer 116 can be disconnected at the undercut portion UC. Additionally, the cathode 117 and the capping layer 118 can also be disconnected at the undercut portion UC. Therefore, as... Figure 9 As shown, the first outer coating 113' and the organic light-emitting layer 116, cathode 117, and capping layer 118 disposed on the first outer coating 113' can be arranged in an island-like configuration. Therefore, the encapsulation layer 119' can be disposed on both sides of the first outer coating 113' all the way to the undercut portion UC. However, it is not limited to this; the encapsulation layer 119' can be partially formed on only one side of the first outer coating 113'. The encapsulation layer 119' may include a getter that absorbs moisture and / or oxygen. Therefore, in the transparent display device 100 according to the second embodiment of the present invention, since the encapsulation layer 119' including the getter is arranged all the way to the undercut portion UC, moisture penetration can be prevented to the greatest extent.

[0198] The main touch electrode MTE, auxiliary touch electrode STE, color filter CF, and black matrix BM can be placed between the encapsulation layer 119' and the opposing substrate 120'. According to one example, the color filter CF can be arranged to correspond to each of the plurality of sub-pixels SP (or plurality of light-emitting areas EA) on the opposing substrate 120'.

[0199] As described above, the white sub-pixel (i.e., the third sub-pixel SP3) may not have a color filter because the organic light-emitting layer 116 emits white light. On the other hand, the fourth sub-pixel SP4, which is a red sub-pixel, may have a red color filter CF3 (or a third color filter CF3) provided between the encapsulation layer 119' and the opposing substrate 120'.

[0200] like Figure 9 As shown, the black matrix BM can be placed at the edge of the color filter CF. Therefore, the black matrix BM can prevent color mixing between sub-pixels SP. The black matrix BM is made of black material and can be placed in the non-emitting area NEA. According to one example, the black matrix BM is formed on the opposing substrate 120' so as to at least partially overlap with the embankment 115, thereby reducing the cell gap between the organic light-emitting layer 116 and the opposing substrate 120', thereby preventing color mixing between sub-pixels.

[0201] Meanwhile, in the transparent display device 100 according to the second embodiment of the present invention, the main touch electrode MTE can be placed below the black matrix BM or at the bottom of the black matrix BM. For example, as Figure 9 As shown, the first main touch electrode MTX can be placed in contact with the lower surface of the black matrix BM. Thus, the main touch electrode MTE does not overlap (or interfere with) the transmissive region TA. Therefore, the transparent display device 100 according to the second embodiment of the present invention is configured such that the main touch electrode MTE is arranged below the black matrix BM, thereby providing a touch electrode without interfering with the transmissive region TA. Therefore, it can be implemented as a transparent touch display device where the reduction in transmittance is minimized or prevented. Furthermore, the light efficiency of the transparent display device 100 according to the second embodiment of the present invention is not reduced because the main touch electrode MTE is located below the black matrix BM and thus does not interfere with the light-emitting region EA.

[0202] The auxiliary touch electrode (STE) can partially contact the lower surface of the main touch electrode (MTE). For example, as... Figure 9 As shown, a portion of the first auxiliary touch electrode STE1 can contact the lower surface of the main touch electrode MTE in the non-light-emitting area NEA, and the remaining portion of the first auxiliary touch electrode STE1 can extend in the first direction (Y-axis direction) and be placed in the transmissive area TA. Therefore, the first auxiliary touch electrode STE1 can be electrically connected to the main touch electrode MTE and can be mostly placed in the transmissive area TA. The first auxiliary touch electrode STE1, arranged in the transmissive area TA, can sense the user's touch and transmit the sensed signal to the main touch electrode MTE. This structure can be equivalently applied to the second auxiliary touch electrode STE2 (e.g., ...). Figure 13 (As shown).

[0203] An upper insulating layer UILD can be placed between the auxiliary touch electrode STE and the opposing substrate 120'. The upper insulating layer UILD is designed to flush the uneven structure formed by the color filter CF, the black matrix BM, and the main touch electrode MTE. Therefore, the upper insulating layer UILD can be formed on the front (or back) side of the opposing substrate 120' to cover the color filter CF, the black matrix BM, and the main touch electrode MTE. Since the upper insulating layer UILD is configured to cover the color filter CF, the black matrix BM, and the main touch electrode MTE, the front (or rear) side of the upper insulating layer UILD can be set to be flat, so the auxiliary touch electrode STE can be easily formed on the front (or rear) side of the upper insulating layer UILD.

[0204] An upper organic film FOC covering the auxiliary touch electrode STE can be placed between the upper insulating layer UILD and the encapsulation layer 119'. As described above, the transparent display panel of the transparent display device 100 according to the second embodiment of the present invention can be formed by bonding the substrate 110 and the opposing substrate 120' after manufacturing each of them. Therefore, if the bonding process is performed while the auxiliary touch electrode STE is exposed to the outside, the auxiliary touch electrode STE may be damaged by foreign matter, which can lead to defects. Therefore, the transparent display device 100 according to the second embodiment of the present invention is provided with an upper organic film FOC covering the auxiliary touch electrode STE, thereby preventing the auxiliary touch electrode STE from being exposed during the bonding process, thereby improving reliability.

[0205] At the same time, such as Figure 9 As shown, the transparent display device 100 according to the second embodiment of the present invention may have the following structural features: the auxiliary touch electrode STE is positioned below the main touch electrode MTE, thereby positioning the auxiliary touch electrode STE closer to the substrate 110 than the main touch electrode MTE.

[0206] Reference Figure 9 In the transparent display device 100 according to the second embodiment of the present invention, the cathode 117 can be placed in the light-emitting region EA and the transmissive region TA. As described above, since the cathode 117 is formed after the undercut portion UC is formed, the cathode 117 can be disconnected through the undercut portion UC. Therefore, as Figure 9 As shown, the cathode 117 arranged in the transmission region TA can be disconnected from the cathode 117 arranged in the light-emitting region EA. Therefore, the cathode 117 arranged in the transmission region TA can be a floating electrode without an applied power supply or voltage.

[0207] Simultaneously, the cathode 117 (or floating electrode 117) placed in the transmission region TA can be positioned to partially overlap with the auxiliary touch electrode STE (or the auxiliary touch electrode STE placed in the transmission region TA). Since no power supply or voltage is applied to the cathode 117 placed in the transmission region TA, the sensing load of the auxiliary touch electrode STE can be minimized or no load is generated. Therefore, the transparent display device 100 according to the second embodiment of the present invention can have improved touch sensitivity of the auxiliary touch electrode STE. In addition, the transparent display device 100 according to the second embodiment of the present invention can be implemented as a transparent display device capable of bilateral touch, because the load of the auxiliary touch electrode STE and the floating electrode is minimized or no load is generated. The transparent display device 100 according to the second embodiment of the present invention can use multiple auxiliary touch electrodes STE to sense touches of different types, and therefore can be implemented as a transparent display device capable of bilateral touch.

[0208] For example, in the transparent display device 100 according to a second embodiment of the present invention, mutual touch sensing causes an electric field generated from the first auxiliary touch electrode STE1 to enter the second auxiliary touch electrode STE2, which is located adjacent to the first auxiliary touch electrode STE1. Here, if there is no change in the mutual capacitance between the first auxiliary touch electrode STE1 and the second auxiliary touch electrode STE2, it is determined that no touch has occurred, and if there is a change in the mutual capacitance between the first auxiliary touch electrode STE1 and the second auxiliary touch electrode STE2 (for example, if the mutual capacitance decreases), it is determined that a touch has occurred, thereby enabling touch sensing.

[0209] For example, when a user's finger makes a touch on one side of the opposing substrate 120, a portion of the electric field generated from the first auxiliary touch electrode STE1 can enter the user's finger. Thus, the transparent display device 100 according to the second embodiment of the present invention can sense the touch because the mutual capacitance between the first auxiliary touch electrode STE1 and the second auxiliary touch electrode STE2 decreases.

[0210] like Figure 7 As shown, in the transparent display device 100 according to the second embodiment of the present invention, the first main touch electrode MTX is arranged adjacent to the second main touch electrode MRX in the first direction (Y-axis direction), such that the auxiliary touch electrode STE (or the first auxiliary touch electrode STE1) connected to the first main touch electrode MTX and the auxiliary touch electrode STE (or the second auxiliary touch electrode STE2) connected to the second main touch electrode MRX can be arranged adjacent to each other in the first direction (Y-axis direction). Therefore, the transparent display device 100 according to the second embodiment of the present invention can sense touch because when a touch occurs on the opposing substrate 120', the mutual capacitance between the first auxiliary touch electrode STE1 and the second auxiliary touch electrode STE2 can change.

[0211] Simultaneously, the transparent display device 100 according to the second embodiment of the present invention can also sense touches on the substrate 110 placed below the opposing substrate 120'. For example... Figure 9 As shown, the transparent display device 100 according to the second embodiment of the present invention is provided with a cathode 117 overlapping with the auxiliary touch electrode STE (or the first auxiliary touch electrode STE1) as a floating electrode, so that the load on the auxiliary touch electrode STE and the floating electrode can be minimized or not generated. Therefore, the transparent display device 100 according to the second embodiment of the present invention can sense touch because even when a touch occurs on the substrate 110, the mutual capacitance between the first auxiliary touch electrode STE1 and the second auxiliary touch electrode STE2 can be changed.

[0212] As a result, because the load on the auxiliary touch electrode STE and the floating electrode is minimized or no load is generated, the transparent display device 100 according to the second embodiment of the present invention can sense both the touch generated on the opposing substrate 120' (or the upper touch) and the touch generated on the substrate 110 (or the lower touch), and can therefore be implemented as a transparent display device capable of dual-sided touch.

[0213] At the same time, such as Figure 9 As shown, the transparent display device 100 according to the second embodiment of the present invention does not have an interlayer insulating layer 111b and a passivation layer 111c in the transmission region TA, which improves the transmittance of the transmission region TA compared to the case where the interlayer insulating layer 111b and the passivation layer 111c are provided in the transmission region.

[0214] Figure 10 It shows along Figure 5 A cross-sectional view of an example section taken from section Ⅲ-Ⅲ'. Figure 11 This is a schematic diagram illustrating a transparent display panel including touch electrodes of a transparent display device according to a second embodiment of the present invention.

[0215] Reference Figure 6 and Figure 10 According to the second embodiment of the present invention, the transparent display device 100 may further include a plurality of upper pads UPAD, a plurality of lower pads DPAD, and side contact electrodes SCE.

[0216] According to one example, the upper pad UPAD can be connected to the touch drive electrode line TXL. Since the touch drive electrode line TXL is connected to the main touch electrode MTE, it can transmit the sensing signal from the main touch electrode MTE to the upper pad UPAD. According to one example, the upper pad UPAD can be located at the end of the opposing substrate 120'. Therefore, as... Figure 10As shown, the upper pad UPAD can partially contact the upper surface of the dam DAM. According to one example, the dam DAM can contact each side of the circuit element layer 111, the outer coating layer 113, the light-emitting element layer E, the encapsulation layer 119', and the upper organic film FOC disposed on the substrate 110. Therefore, the dam DAM can prevent at least one of the circuit element layer 111, the outer coating layer 113, the light-emitting element layer E, the encapsulation layer 119', and the upper organic film FOC from flowing out or protruding to the outside of the substrate 110 and / or the opposing substrate 120'.

[0217] According to one example, a lower pad DPAD is disposed on a substrate 110 and can be positioned facing an upper pad UPAD. For example, the lower pad DPAD can be located at an end of the substrate 110 so as to face the upper pad UPAD in a third direction (Z-axis direction). Furthermore, the lower pad DPAD can partially contact the lower surface of the dam DAM. Each of the plurality of lower pad DPADs can be connected via multiple lower touch connection lines (DTCLs) (such as...). Figure 11 (As shown) Connect to touch driver 210.

[0218] According to one example, a side contact electrode SCE is provided to transmit touch signals sensed by touch electrodes on the opposing substrate 120' to a touch driver 210 disposed on the substrate 110. For example... Figure 10 As shown, the side contact electrode SCE can be configured to cover the lower surface and side surface (or right surface) of the upper pad UPAD that are not covered by the dam DAM, and to cover the upper surface and side surface (or right surface) of the lower pad DPAD that are not covered by the dam DAM. Therefore, the side contact electrode SCE can be electrically connected to the upper pad UPAD and the lower pad DPAD. Thus, touch signals sensed (or detected) by the main touch electrode MTE and / or auxiliary touch electrode STE of the substrate 120' can be transmitted to the touch driver 210 via the upper pad UPAD, the side contact electrode SCE, and the lower pad DPAD.

[0219] As a result, even if the substrate 110 and the opposing substrate 120' are manufactured and bonded separately, the transparent display device 100 according to the second embodiment of the present invention can transmit touch signals detected by the main touch electrode MTE and / or auxiliary touch electrode STE disposed on the opposing substrate 120' to the touch driver 210 on the substrate 110 via the side contact electrode SCE. Therefore, the transparent display device 100 according to the second embodiment of the present invention can be implemented as a large-area transparent display device equipped with touch electrodes.

[0220] Simultaneously, after bonding the substrate 110 and the opposing substrate 120', a side contact electrode SCE can be printed on each side of the substrate 110 and the opposing substrate 120' using a printing method. Therefore, the transparent display device 100 according to the second embodiment of the present invention may have the following structural feature: the side contact electrode SCE covers at least a portion of the side surface of the substrate 110 and at least a portion of the side surface of the opposing substrate 120'.

[0221] Furthermore, the transparent display device 100 according to the second embodiment of the present invention may further include a sealing portion SLP. The sealing portion SLP is used to prevent the side contact electrodes SCE from being exposed to the outside. When the side contact electrodes are exposed to the outside, the side contact electrodes made of metallic materials can be oxidized by external air or moisture or damaged by external impact. Therefore, the sealing portion SLP can be made to contact each side of the substrate 110 and the opposing substrate 120' while covering the side contact electrodes SCE. As a result, the side contact electrodes SCE can be prevented from being oxidized by being sealed by the sealing portion SLP and can be protected from the effects of impact.

[0222] Figure 12 yes Figure 7 A magnified view of part B. Figure 13 yes Figure 7 A magnified view of part C.

[0223] Reference Figure 12 In the transparent display device 100 according to a second embodiment of the present invention, one of the plurality of first main touch electrodes MTX can be connected to at least two or more first auxiliary touch electrodes STE1. For example, as Figure 12 As shown, the first main touch electrode MTX extending in the second direction (X-axis direction) can be connected to the first auxiliary touch electrode STE1 disposed in the transmissive area TA of each of the plurality of pixels P. Here, the plurality of pixels P can refer to pixels P arranged adjacent to each other in the second direction (X-axis direction). Therefore, one first main touch electrode MTX can transmit the touch signal sensed by each of the two first auxiliary touch electrodes STE1 to the upper pad UPAD through the touch line and the touch drive electrode line.

[0224] Simultaneously, the first main touch electrode MTX can be connected to the first touch routing line TXRL1. For example, the first main touch electrode MTX extending in the second direction (X-axis direction) can be arranged between multiple pixels P and can be connected to the first touch routing line TXRL1 extending in the first direction (Y-axis direction). Figure 12As shown, another first touch route line TXRL2 can be arranged parallel below the first touch route line TXRL1, with a pixel P between them. The other first touch route line TXRL2 can be connected to the first main touch electrode MTX in another pixel spaced apart along the first direction (Y-axis direction). Therefore, the first touch route line TXRL1 and the other first touch route line TXRL2 can respectively transmit touch signals sensed from the pixel P (or the first auxiliary touch electrode STE1) arranged at different positions.

[0225] A first touch routing line TXRL1 and another first touch routing line TXRL2 can be arranged in a single touch area. Therefore, each of the first touch routing lines TXRL1 and TXRL2 can be connected in the non-display area NDA via touch lines and touch drive electrode lines. For example, suppose the first touch routing line TXRL1 and the other first touch routing line TXRL2 are arranged in... Figure 7 On the 1a sub-touch driving electrode STX1a, each of the first touch routing line TXRL1 and another first touch routing line TXRL2 can be connected to each of the multiple 1a touch lines STXL1a, and the multiple 1a touch lines STXL1a can be connected to the first touch driving electrode line TXL1 in the non-display area NDA. Therefore, the first touch routing line TXRL1 and the other first touch routing line TXRL2 can be electrically connected in the non-display area NDA.

[0226] Reference Figure 13 In the transparent display device 100 according to a second embodiment of the present invention, one of the plurality of second main touch electrodes MRX can be connected to at least two or more second auxiliary touch electrodes STE2. For example, as Figure 13 As shown, the second main touch electrode MRX, extending in the second direction (X-axis direction), can be connected to the second auxiliary touch electrode STE2 disposed in the transmissive area TA of each of the plurality of pixels P. Here, the plurality of pixels P can refer to pixels P arranged adjacent to each other in the second direction (X-axis direction). Therefore, one second main touch electrode MRX can transmit touch signals sensed from each of the two second auxiliary touch electrodes STE2 to the upper pad UPAD via the touch receiving electrode line RXL.

[0227] Simultaneously, the second main touch electrode MRX can be connected to the second touch routing line RXRL1. For example, the second main touch electrode MRX extending in the second direction (X-axis direction) can be connected to another second touch routing line RXRL2 extending in the first direction (Y-axis direction). Figure 13As shown, a second touch route line RXRL1 can be arranged parallel to another second touch route line RXRL2, with a pixel P interposed between them. The second touch route line RXRL1 can be connected to a second main touch electrode MRX in another pixel arranged spaced apart from each other in the first direction (Y-axis direction). Therefore, the second touch route line RXRL1 and the other second touch route line RXRL2 can respectively transmit touch signals sensed from pixel P (or second auxiliary touch electrode STE2) arranged at different positions.

[0228] The second touch routing line RXRL1 and another second touch routing line RXRL2 can be arranged in a single touch area. Therefore, each of the second touch routing lines RXRL1 and RXRL2 can be connected to the upper pad UPAD in the non-display area NDA via each of the multiple touch receiving electrode lines RXL. For example, suppose the second touch routing lines RXRL1 and RXRL2 are arranged in... Figure 7 On the 1a touch receiving electrode RX1a, each of the second touch routing line RXRL1 and another second touch routing line RXRL2 can be connected to each of the multiple 1a touch receiving electrode lines RXL1a, and the multiple 1a touch receiving electrode lines RXL1a can be connected to the upper pad UPAD in the non-display area NDA. Therefore, the second touch routing line RXRL1 and the other second touch routing line RXRL2 can transmit touch signals to the touch driver 210 through the upper pad UPAD.

[0229] Figure 14 It shows along Figure 13 A partial cross-sectional view of an example taken from section IV-IV'.

[0230] Reference Figure 14 According to one example, the second touch routing line RXRL1 may not be electrically connected to another second touch routing line RXRL2 in the touch area. For example, the second touch routing line RXRL1 may not be electrically connected to the second touch area TUA2, which is provided with touch receiving electrode RX1a. Figure 7 The other second touch route line RXRL2 is shown in the diagram.

[0231] like Figure 14 As shown, another second touch routing line RXRL2 is connected to a second main touch electrode MRX, and the second main touch electrode MRX can be arranged to be spaced apart from the second touch routing line RXRL1, with an upper insulating layer UILD between them. That is, according to Figure 14 In one example, another second touch routing line RXRL2 can be arranged closer to the black matrix BM than the second main touch electrode MRX. For example... Figure 14As shown, since the second main touch electrode MRX is positioned spaced apart from the second touch route line RXRL1 and the upper insulating layer UILD is inserted therebetween, the second touch route line RXRL1 can be electrically connected to another second touch route line RXRL2 in the touch area. Although not shown, the second main touch electrode MRX can extend in a second direction (X-axis direction) and be connected to another second touch route line at different locations through another contact hole formed in the upper insulating layer UILD. Therefore, a transparent display device 100 according to the second embodiment of the present invention can be provided, such that multiple second touch routes RXRL1, RXRL2 used to transmit touch signals sensed at different locations in a transmissive area do not interfere with each other. In this case, the second main touch electrode MRX can be made of a transparent conductive material such as ITO, but is not limited thereto, and can be made of the same material as the other second touch route line RXRL2. Figure 14 As shown, the second main touch electrode MRX can be covered by the upper organic film FOC so that it is not exposed to the outside during the bonding process of the substrate 110 and the opposing substrate 120'. This structure and effect can be equally applied to multiple first touch routing lines.

[0232] Figure 15 It shows along Figure 13 A partial cross-sectional view of another example taken from section IV-IV'.

[0233] Reference Figure 15 According to another example, the second touch routing line RXRL1 may not be electrically connected to another second touch routing line RXRL2 in the touch area. For example, the second touch routing line RXRL1 may not be electrically connected to the second touch area TUA2, which is provided with touch receiving electrode RX1a. Figure 7 The other second touch route line RXRL2 is shown in the diagram.

[0234] like Figure 15 As shown, two second touch routing lines RXRL2 (or second main touch electrodes MRX) can be spaced apart from each other in the second direction (X-axis direction), with second touch routing line RXRL1 located between them. In this case, two additional second touch routing lines RXRL2 (or second main touch electrodes MRX) are arranged on the same layer as the second touch routing line RXRL1, and can be arranged closer to the black matrix BM than the second touch routing connection line RXCL. Figure 15As shown, another second touch routing line RXRL2 (or the second main touch electrode MRX on the left side of the second touch routing line RXRL1) can be connected to one side of the second touch routing connection line RXCL through a contact hole penetrating the upper insulating layer UILD, and the other side of the second touch routing connection line RXCL can be connected to another second touch routing line RXRL2 (or the second main touch electrode MRX on the right side of the second touch routing line RXRL1) through another contact hole penetrating the upper insulating layer UILD. Therefore, as Figure 15 As shown, two additional second touch routing lines RXRL2 (or second main touch electrodes MRX) can be electrically connected to each other via a second touch routing connection line RXCL. Furthermore, since the second touch routing line RXRL1 is spaced apart from the second touch routing connection line RXCL and has an upper insulating layer UILD between them, the second touch routing line RXRL1 may not be electrically connected to the other second touch routing line RXRL2 (or second main touch electrode MRX) in the touch area. The second touch routing connection line RXCL is used to electrically connect the two spaced-apart second touch routing lines RXRL2 (or second main touch electrodes MRX), and can therefore be represented as a touch routing bypass line. The second touch routing connection line RXCL can be made of a transparent conductive material such as ITO, but is not limited to this; it can be made of the same opaque conductive material (or low-resistance metal material) as the other second touch routing line RXRL2.

[0235] Therefore, a transparent display device 100 according to a second embodiment of the present invention can be provided, such that multiple second touch routing lines RXRL1 and RXRL2 used to transmit touch signals sensed at different locations in a transmissive area do not interfere with each other, thereby improving touch sensitivity. Figure 15 As shown, the second touch route connection line RXCL can be covered by the upper organic film FOC so as not to be exposed to the outside during the bonding process. This structure and effect can be equivalently applied to multiple first touch route lines.

[0236] Embodiments of the invention have been described in more detail with reference to the accompanying drawings; however, the invention is not limited to these embodiments and can be implemented in various modifications without departing from the technical spirit of the invention. Therefore, the embodiments disclosed herein are intended to illustrate, not limit, the technical spirit of the invention, and the scope of the technical spirit of the invention is not limited by these embodiments. Thus, the above embodiments are exemplary in all respects and should be understood as non-limiting. The scope of protection of the invention should be interpreted by the claims, and all technical ideas within the scope of the claims should be interpreted as included within the scope of the claims.

[0237] The present invention provides that the main touch electrode is configured to partially overlap with the black matrix, thereby enabling touch while minimizing the reduction in transmittance.

[0238] Furthermore, the present invention provides an auxiliary touch electrode in the transmission region, thereby improving touch sensitivity.

[0239] Furthermore, the present invention can connect the touch electrode of the opposing substrate (or the upper substrate) to the touch driver of the substrate (or the lower substrate) by using side connection electrodes on the sides of the substrate (or the lower substrate) and the opposing substrate (or the upper substrate), thereby achieving a large area while minimizing the increase in bezel size.

[0240] Furthermore, the present invention can form touch electrodes on the opposing substrate (or upper substrate) by utilizing the process lines of the substrate (or lower substrate), and can reduce production energy through process optimization.

[0241] The effects that can be obtained from the present invention are not limited to those described above; other effects will be clear to those skilled in the art from the following description.

Claims

1. A transparent display device, comprising: A substrate having a display area and a non-display area surrounding the display area, wherein a transmissive area and a plurality of sub-pixels are arranged in the display area; A black matrix is ​​arranged on the substrate and located between the plurality of sub-pixels and the transmissive region, and between the plurality of sub-pixels; The main touch electrode partially overlaps with the black matrix; as well as An auxiliary touch electrode extends from the main touch electrode and is disposed in the transmission region.

2. The transparent display device according to claim 1, wherein the main touch electrode does not overlap with each of the plurality of sub-pixels.

3. The transparent display device according to claim 1, wherein the main touch electrode is made of an opaque conductive material. The auxiliary touch electrode is made of a transparent conductive material.

4. The transparent display device according to claim 1, wherein the auxiliary touch electrodes are arranged in a grid pattern. The edges of the auxiliary touch electrode are arranged in a closed loop.

5. The transparent display device according to claim 1, wherein the main touch electrode is disposed on the black matrix.

6. The transparent display device according to claim 1, wherein the auxiliary touch electrode is spaced further away from the substrate than the main touch electrode.

7. The transparent display device according to claim 1, The plurality of sub-pixels are configured to emit light of different colors, and include a first sub-pixel, a second sub-pixel, and a third sub-pixel arranged sequentially in a first direction. Each of the first sub-pixel and the third sub-pixel forms a cross shape. The second sub-pixel is square.

8. The transparent display device according to claim 1, The main touch electrode includes a plurality of first main touch electrodes and a plurality of second main touch electrodes spaced apart from the plurality of first main touch electrodes. The plurality of first main touch electrodes are arranged in the first touch area. The plurality of second main touch electrodes are arranged in the second touch area.

9. The transparent display device according to claim 8, The first touch area is arranged in a segmented manner. The second touch area is arranged in a stripe pattern.

10. The transparent display device according to claim 1, Each of the plurality of sub-pixels includes: Pixel electrodes disposed on the substrate; An organic light-emitting layer disposed on the pixel electrode; as well as The cathode disposed on the organic light-emitting layer The organic light-emitting layer arranged on each of the plurality of sub-pixels is configured to emit light of different colors.

11. The transparent display device according to claim 1, wherein the main touch electrode is placed at the bottom of the black matrix.

12. The transparent display device of claim 11, wherein the auxiliary touch electrode is positioned closer to the substrate than the main touch electrode.

13. The transparent display device according to claim 11, The plurality of sub-pixels includes: A first sub-pixel and a second sub-pixel are arranged sequentially in a first direction and are configured to emit light of different colors. as well as The third and fourth sub-pixels are arranged sequentially in the first direction and are configured to emit light of a different color than the first and second sub-pixels. The third sub-pixel and the fourth sub-pixel are arranged adjacent to the first sub-pixel and the second sub-pixel in a second direction.

14. The transparent display device according to claim 11, Each of the plurality of sub-pixels includes: Pixel electrodes disposed on the substrate; An organic light-emitting layer disposed on the pixel electrode; as well as The cathode disposed on the organic light-emitting layer The organic light-emitting layer arranged on each of the plurality of sub-pixels is configured to emit light of the same color.

15. The transparent display device of claim 14, wherein each of the plurality of sub-pixels further comprises a light-emitting region adjacent to the transmissive region. The cathode is arranged in the light-emitting region and the transmission region. The cathode arranged in the transmission region is a floating electrode that is disconnected from the cathode arranged in the light-emitting region.

16. The transparent display device of claim 15, wherein the floating electrode partially overlaps with the auxiliary touch electrode.

17. The transparent display device according to claim 1, further comprising: Touch drive electrode lines connected to the main touch electrode; The upper pad is connected to the touch drive electrode line; An opposing substrate having the aforementioned upper pad; Lower pads, the lower pads being disposed on the substrate and arranged to face the upper pads; and Side contact electrodes connecting the upper pad and the lower pad.

18. The transparent display device of claim 17, wherein the side contact electrode covers at least a portion of the side surface of the substrate and at least a portion of the side surface of the opposing substrate.

19. The transparent display device according to claim 1, The main touch electrode includes a plurality of first main touch electrodes. The auxiliary touch electrode includes a plurality of first auxiliary touch electrodes. One of the plurality of first main touch electrodes is connected to at least two or more of the plurality of first auxiliary touch electrodes.

20. The transparent display device according to claim 19, further comprising: A first touch routing line connected to the first main touch electrode; as well as Another first touch route line is arranged parallel to the first touch route line. The first touch routing line and the other first touch routing line are connected in the non-display area.

21. The transparent display device according to claim 1, The main touch electrode includes a plurality of second main touch electrodes. The auxiliary touch electrode includes a plurality of second auxiliary touch electrodes. One of the plurality of second main touch electrodes is connected to at least two or more of the plurality of second auxiliary touch electrodes.

22. The transparent display device according to claim 21, further comprising: A second touch routing line connected to the second main touch electrode; as well as Another second touch route line is arranged parallel to the second touch route line. Each of the second touch routing line and the other second touch routing line is connected to the upper pad in the non-display area.

23. The transparent display device of claim 22, wherein the second touch routing line is not electrically connected to the other second touch routing line in the touch area.

24. The transparent display device according to claim 15 further includes an upper insulating layer disposed on the main touch electrode, and wherein the upper insulating layer is configured as a common layer covering the main touch electrode and the entire light-emitting area, the non-light-emitting area adjacent to the light-emitting area, and the transmissive area.

25. The transparent display device of claim 24, wherein the auxiliary touch electrode is disposed on the upper insulating layer and electrically connected to the main touch electrode.

26. The transparent display device of claim 8, wherein the first main touch electrode is arranged adjacent to the second main touch electrode in a first direction, such that an auxiliary touch electrode connected to the first main touch electrode and an auxiliary touch electrode connected to the second main touch electrode are arranged adjacent to each other in the first direction.

27. The transparent display device according to claim 8, further comprising a touch driver, Each of the plurality of first main touch electrodes is connected to the touch driver via a touch drive electrode line. Each of the plurality of first main touch electrodes includes a plurality of sub-touch driving electrodes spaced apart from each other along a first direction. The multiple sub-touch driving electrodes in the first touch area are connected to the touch driving electrode lines in the non-display area via multiple touch lines arranged along the second direction.

28. The transparent display device of claim 13, wherein the main touch electrode is arranged to overlap with each of the black matrix between the second sub-pixel and the transmissive region and the black matrix between the fourth sub-pixel and the transmissive region.

29. The transparent display device according to claim 14, wherein the transmissive region includes an undercut portion. The organic light-emitting layer and the cathode are each disconnected at the undercut.

30. The transparent display device according to claim 23 further includes a second touch route line arranged parallel to the second touch route line. The second touch routing line and the yet another second touch routing line are electrically connected to each other via touch routing connection lines. The second touch route line and the third touch route line are arranged closer to the black matrix than the touch route connection line.

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