Touch display device and driving circuit

Abstract

The embodiments of the present disclosure relate to a touch display device and a driving circuit, wherein a common electrode necessary for configuring light-emitting elements for self-emissive light is included and a touch sensor is embedded on the common electrode. Even if the voltage level of a touch driving signal for driving the touch sensor fluctuates, the generation of ripple noise at the common electrode of the light-emitting elements can be prevented, or the influence on display driving caused by generated ripple noise can be eliminated or minimized through a polarity inversion driving method of the touch sensor or a change in the panel structure.

Description

Technology Field

[0001] The embodiments of the present disclosure relate to a touch display device and a driving circuit. Background Technology

[0002] As the information society advances, various types of display devices for displaying images are being developed. Among these display devices are self-emissive displays that do not have a backlight unit on the outside of the display panel, but instead have light-emitting elements formed on the display panel that emit light themselves.

[0003] In the case of such a self-emissive display, each of the multiple subpixels arranged on the display panel requires a light-emitting element, multiple transistors for driving the light-emitting element, and at least one capacitor.

[0004] Meanwhile, technology development is underway to apply touch-based input methods to self-emissive displays, enabling users to easily and intuitively input information or commands.

[0005] As such, to apply touch-based input methods to self-emissive displays, a touch panel containing a touch sensor must be manufactured separately and combined with the display panel. This method has the disadvantage of increasing the size and thickness of the device and complicating the manufacturing process. Accordingly, technology is being developed to embed the touch sensor into the display panel without manufacturing the touch panel separately. However, embedding the touch sensor into the display panel can lead to problems where the sensor's operation adversely affects the display's operation, thereby degrading the image display quality. The problem to be solved

[0006] Embodiments of the present disclosure may provide a self-emissive display type touch display device having a built-in touch sensor capable of providing excellent image quality and precise touch sensitivity, and a driving circuit included therein.

[0007] Embodiments of the present disclosure may provide a self-emissive display type touch display device having a built-in touch sensor that can eliminate or minimize the effect of touch driving on display driving, and a driving circuit included therein.

[0008] The embodiments of the present disclosure include a common electrode necessary for configuring light-emitting elements for self-luminescence, and when a touch sensor is embedded on the common electrode, the touch display device and driving circuit can prevent ripple noise from occurring at the common electrode of the light-emitting elements even if the voltage level of the touch driving signal for driving the touch sensor fluctuates.

[0009] The embodiments of the present disclosure can provide a touch display device and a driving circuit that can eliminate or minimize the effect of ripple noise on display driving even if ripple noise is generated at the common electrode of light-emitting elements due to voltage level fluctuations of a touch driving signal for driving a touch sensor. means of solving the problem

[0010] Embodiments of the present disclosure may provide a touch display device comprising: a display panel including a plurality of data lines, a plurality of gate lines and a plurality of subpixels, a plurality of light-emitting elements corresponding to each of the plurality of subpixels, an encapsulation layer disposed on the plurality of light-emitting elements, and a plurality of touch electrodes disposed on the encapsulation layer; and a touch driving circuit that, when supplying a first touch driving signal having a voltage level that varies to a first touch electrode among the plurality of touch electrodes, supplies a second touch driving signal having the same frequency as the first touch driving signal, a voltage level that varies, and a polarity that is inverted compared to the first touch driving signal to a second touch electrode among the plurality of touch electrodes that is adjacent to the first touch electrode in a row direction.

[0011] A plurality of touch electrodes further include a third touch electrode adjacent to the first touch electrode in a column direction and a fourth touch electrode adjacent to the second touch electrode in a column direction, and the third touch electrode and the fourth touch electrode may be adjacent in a row direction.

[0012] In a touch display device according to embodiments of the present disclosure, the touch driving circuit may supply a first touch driving signal to a first touch electrode and a second touch driving signal having a polarity inverted compared to the first touch driving signal to a second touch electrode, supply a third touch driving signal having the same frequency as the first touch driving signal and the same polarity as the first touch driving signal to a third touch electrode, and supply a fourth touch driving signal having the same frequency as the second touch driving signal and the same polarity as the second touch driving signal to a fourth touch electrode.

[0013] In a touch display device according to embodiments of the present disclosure, the touch driving circuit may supply a first touch driving signal to a first touch electrode and a second touch driving signal having a polarity inverted compared to the first touch driving signal to a second touch electrode, supply a third touch driving signal having the same frequency as the second touch driving signal and the same polarity as the second touch driving signal to a third touch electrode, and supply a fourth touch driving signal having the same frequency as the first touch driving signal and the same polarity as the first touch driving signal to a fourth touch electrode.

[0014] A touch display device according to embodiments of the present disclosure may further include a data driving circuit for driving a plurality of data lines and a gate driving circuit for driving a plurality of gate lines.

[0015] A touch display device according to embodiments of the present disclosure can simultaneously perform display driving and touch driving. Accordingly, when a data driving circuit outputs data signals for image display to a plurality of data lines, the touch driving circuit can output a first touch driving signal and a second touch driving signal.

[0016] A touch display device according to embodiments of the present disclosure spatially separates a display driving area and a touch driving area, and can simultaneously perform display driving and touch driving in each of the spatially separated display driving area and touch driving area.

[0017] Accordingly, when the touch driving circuit supplies a first touch driving signal and a second touch driving signal to each of the first touch electrode and the second touch electrode, the touch driving circuit does not supply a touch driving signal to the touch electrodes included in the second touch electrode row spaced apart in the column direction from the first touch electrode row including the first touch electrode and the second touch electrode, and the gate driving circuit can output a gate signal of a turn-on voltage level to one or more gate lines that overlap with the second touch electrode row.

[0018] In a touch display device according to embodiments of the present disclosure, each of the plurality of subpixels may include a light-emitting element comprising a pixel electrode, a light-emitting layer on the pixel electrode, and a common electrode on the light-emitting layer, a driving transistor for driving the light-emitting element, a switching transistor for switching whether there is an electrical connection between the gate electrode of the driving transistor and a data line, and a storage capacitor electrically connected between the gate electrode of the driving transistor and the source electrode or drain electrode of the driving transistor.

[0019] Pixel electrodes are placed for each of the multiple subpixels and are electrically connected to the source electrode or drain electrode of the driving transistor, and a common electrode is placed in common for the multiple subpixels and a base voltage that does not fluctuate in voltage level can be applied.

[0020] Each of the multiple touch electrodes can correspond in size to two or more subpixels.

[0021] In a touch display device according to embodiments of the present disclosure, the display panel may further include a plurality of base wires electrically connected to a common electrode. The plurality of base wires may be spaced apart from a plurality of data lines.

[0022] At least one of the plurality of base wires may have a potential difference with an adjacent data line, or a potential difference with the electrode connected to the adjacent data line among the source electrode and drain electrode of an adjacent switching transistor.

[0023] A plurality of base wires are located below a common electrode, and the display panel may further include at least one insulating layer disposed over the plurality of base wires. The at least one insulating layer has a plurality of contact holes, and the common electrode may be electrically connected to a portion of the plurality of base wires exposed through the plurality of contact holes.

[0024] Each of the multiple base wires may be located on the same layer as at least one of the source electrode, drain electrode, and gate electrode of a switching transistor included in an adjacent subpixel.

[0025] In a touch display device according to embodiments of the present disclosure, the display panel may further include a shield layer positioned above a base wiring and below a switching transistor or a data line, which overlaps with at least a portion of the base wiring and overlaps with at least a portion of one electrode of the switching transistor or at least a portion of a data line electrically connected to one electrode of the switching transistor.

[0026] Here, the shield layer may be one of the first plate and the second plate constituting the storage capacitor.

[0027] In a touch display device according to embodiments of the present disclosure, the frequencies of the first touch driving signal and the second touch driving signal may be integer multiples of the display frame frequency.

[0028] Embodiments of the present disclosure may provide a driving circuit comprising: a first touch driving unit that supplies a first touch driving signal, wherein the voltage level of which varies is a first touch electrode among a plurality of touch electrodes; and a second touch driving unit that, when the first touch driving unit supplies the first touch driving signal to the first touch electrode, supplies a second touch driving signal, wherein the voltage level of which varies is the same as that of the first touch driving signal and which has an inverted polarity compared to the first touch driving signal, to a second touch electrode among a plurality of touch electrodes that is adjacent to the first touch electrode in a row direction.

[0029] In a driving circuit according to embodiments of the present disclosure, a first touch driving unit may include a preamplifier that receives a first touch driving signal, supplies it to a first touch electrode, and detects a signal from the first touch electrode, and a second touch driving unit may include a preamplifier that receives a second touch driving signal, supplies it to a second touch electrode, and detects a signal from the second touch electrode.

[0030] Embodiments of the present disclosure may provide a touch display device comprising: a plurality of data lines; a light-emitting element comprising a pixel electrode, a light-emitting layer, and a common electrode; a plurality of subpixels comprising a driving transistor for driving the light-emitting element, a switching transistor for controlling the connection between the gate electrode of the driving transistor and the data lines, and a storage capacitor connected between the gate electrode of the driving transistor and the pixel electrode; an encapsulation layer disposed on the common electrode; a plurality of touch electrodes disposed on the encapsulation layer; a plurality of base wires located below the common electrode and electrically connected to the common electrode; and a plurality of shield layers located above the plurality of base wires, located below the switching transistor or the data lines, overlapping with at least a portion of the base wires, and overlapping with at least a portion of one electrode of the switching transistor or at least a portion of the data lines electrically connected to one electrode of the switching transistor.

[0031] Multiple base wires can be spaced apart from multiple data lines.

[0032] A touch display device according to embodiments of the present disclosure may further include a plurality of insulating layers disposed on a plurality of base wires and having a plurality of contact holes.

[0033] The common electrode can be electrically contacted with a portion of a plurality of base wires exposed through a plurality of contact holes.

[0034] Each of the plurality of shield layers may overlap with at least a portion of the base wiring and may overlap with at least a portion of the electrode of the switching transistor or at least a portion of the data line electrically connected to the electrode of the switching transistor so as to block the base wiring from being capacitively coupled with the base wiring.

[0035] Each of the multiple shield layers may be one of the first plate and the second plate constituting the storage capacitor.

[0036] In a touch display device according to embodiments of the present disclosure, a plurality of touch electrodes include a first touch electrode and a second touch electrode adjacent in a row direction, and when a first touch driving signal having a voltage level that varies is applied to the first touch electrode, a second touch driving signal having a voltage level that varies with the same frequency as the first touch driving signal and having a polarity that is inverted compared to the first touch driving signal may be applied to the second touch electrode.

[0037] Embodiments of the present disclosure may provide a touch display device comprising: a display panel including a plurality of data lines, a plurality of gate lines and a plurality of subpixels, a plurality of light-emitting elements corresponding to each of the plurality of subpixels, an encapsulation layer disposed on the plurality of light-emitting elements, and a plurality of touch electrodes disposed on the encapsulation layer; and a touch driving circuit that supplies a touch driving signal to at least one of the plurality of touch electrodes, wherein the touch driving signal has a frequency corresponding to an integer multiple of the display frame frequency. Effects of the invention

[0038] According to embodiments of the present disclosure, a self-emissive display type touch display device having a built-in touch sensor capable of providing excellent image quality and precise touch sensitivity, and a driving circuit included therein can be provided.

[0039] According to embodiments of the present disclosure, a self-emissive display type touch display device having a built-in touch sensor that can eliminate or minimize the effect of touch driving on display driving, and a driving circuit included therein can be provided.

[0040] According to embodiments of the present disclosure, a touch display device and a driving circuit can be provided that prevent ripple noise from occurring at the common electrode of the light-emitting elements even if the voltage level of the touch driving signal for driving the touch sensor fluctuates, when the common electrode required for configuring light-emitting elements for self-luminescence is included and a touch sensor is embedded on the common electrode.

[0041] According to the embodiments of the present disclosure, even if ripple noise is generated at the common electrode of light-emitting elements due to voltage level fluctuations of a touch driving signal for driving a touch sensor, a touch display device and a driving circuit can be provided that can eliminate or minimize the effect of ripple noise on display driving. Brief explanation of the drawing

[0042] FIG. 1 is a system configuration diagram of a touch display device according to embodiments of the present disclosure. FIG. 2 is an exemplary diagram of a touch sensing system of a touch display device according to embodiments of the present disclosure. FIG. 3 is an equivalent circuit of a subpixel in a display panel of a touch display device according to embodiments of the present disclosure. FIGS. 4 and 5 are drawings showing a connection structure between a common electrode and a plurality of base wires in a display panel of a touch display device according to embodiments of the present disclosure. FIG. 6 is a cross-sectional view of a display panel of a touch display device according to embodiments of the present disclosure. FIGS. 7 and 8 are drawings for explaining common electrode ripple noise induced in a common electrode by touch driving and the effect of common electrode ripple noise in a display panel of a touch display device according to embodiments of the present disclosure. FIG. 9 is a diagram showing a touch drive of a non-inverted drive method of a touch display device according to embodiments of the present disclosure. FIG. 10 is a diagram showing a thermal inversion type touch driving for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure. FIG. 11 is a diagram showing a dot inversion type touch driving for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure. FIGS. 12 and 13 are drawings for illustrating a driving area division method for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure. FIGS. 14 and 15 are drawings for explaining a driving method for removing common electrode ripple noise in a touch display device according to embodiments of the present disclosure. FIG. 16 is a cross-sectional view of a display panel for reducing the effect of common electrode ripple noise on a subpixel in a touch display device according to embodiments of the present disclosure. FIG. 17 is an equivalent circuit showing that, according to the cross-sectional view of FIG. 16, the phenomenon of common electrode ripple noise being coupled to the data signal is prevented. FIGS. 18 and 19 are examples of the arrangement of base wiring in a display panel of a touch display device according to embodiments of the present disclosure. Specific details for implementing the invention

[0043] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. In assigning reference numerals to the components of each drawing, the same components may have the same reference numeral as much as possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions may obscure the essence of the present disclosure, such detailed description may be omitted. Where terms such as "comprising," "having," or "consisting of" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it may include a plural unless there is a special explicit description otherwise.

[0044] Additionally, terms such as first, second, A, B, (a), (b), etc., may be used to describe the components of the present disclosure. These terms are used merely to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by such terms.

[0045] In describing the positional relationship of components, where it is stated that two or more components are "connected," "combined," or "joined," it should be understood that while the two or more components may be directly "connected," "combined," or "joined," they may also be "connected," "combined," or "joined" with other components "intervened." Here, the other components may be included in one or more of the two or more components that are "connected," "combined," or "joined" with one another.

[0046] In describing the temporal flow relationship regarding components, methods of operation, or methods of production, for example, when the temporal or sequential relationship is described using "after," "following," "next," or "before," it may include cases where the relationship is not continuous unless "immediately" or "directly" is used.

[0047] Meanwhile, where numerical values ​​or corresponding information regarding a component (e.g., levels, etc.) are mentioned, even without separate explicit notation, the numerical values ​​or corresponding information may be interpreted as including a range of error that may occur due to various factors (e.g., process factors, internal or external shocks, noise, etc.).

[0048] FIG. 1 is a system configuration diagram of a touch display device (100) according to embodiments of the present disclosure.

[0049] Referring to FIG. 1, the touch display device (100) may include components for displaying images, such as a display panel (110), a data driving circuit (120), a gate driving circuit (130), and a display controller (140).

[0050] The display panel (110) may include a display area (DA) where an image is displayed and a non-display area (NDA) where an image is not displayed. The non-display area (NDA) may be an outer area of ​​the display area (DA) and may also be referred to as a bezel area. The non-display area (NDA) may be an area visible from the front of the touch display device (100), or it may be an area that is bent and not visible from the front of the touch display device (100).

[0051] The display panel (110) may include a plurality of subpixels (SP). For example, the touch display device (100) may be a display device of various types, including a liquid crystal display, an organic light-emitting display, a micro LED (Micro Light Emitting Diode) display, a quantum dot display, etc. Depending on the type of the touch display device (100), the structure of each of the plurality of subpixels (SP) may vary. For example, if the touch display device (100) is a self-emissive display device in which the subpixels (SP) emit light themselves, each subpixel (SP) may include a light-emitting element that emits light itself, one or more transistors, and one or more capacitors.

[0052] Additionally, the display panel (110) may further include various types of signal wiring to drive a plurality of subpixels (SP). For example, the various types of signal wiring may include a plurality of data lines (DL) that transmit data signals (also called data voltages or image signals) and a plurality of gate lines (GL) that transmit gate signals (also called scan signals).

[0053] Multiple data lines (DL) and multiple gate lines (GL) may intersect each other. Each of the multiple data lines (DL) may be arranged to extend in the column direction. Each of the multiple gate lines (GL) may be arranged to extend in the row direction.

[0054] Here, in this specification, the column direction and the row direction are relative. For example, the column direction may be vertical and the row direction may be horizontal. As another example, the column direction may be horizontal and the row direction may be vertical.

[0055] The data driving circuit (120) is a circuit for driving a plurality of data lines (DL) and can output data signals to a plurality of data lines (DL). The gate driving circuit (130) is a circuit for driving a plurality of gate lines (GL) and can output gate signals to a plurality of gate lines (GL). The display controller (140) is a device for controlling the data driving circuit (120) and the gate driving circuit (130) and can control the driving timing for a plurality of data lines (DL) and the driving timing for a plurality of gate lines (GL).

[0056] The display controller (140) can supply various types of data driving control signals (DCS) to the data driving circuit (120) to control the data driving circuit (120), and can supply various types of gate driving control signals (GCS) to the gate driving circuit (130) to control the gate driving circuit (130).

[0057] The data driving circuit (120) can supply data signals to a plurality of data lines (DL) according to the driving timing control of the display controller (140). The data driving circuit (120) receives digital image data (DATA) from the display controller (140) and converts the received image data (DATA) into analog data signals and outputs them to a plurality of data lines (DL).

[0058] The gate driving circuit (130) can supply gate signals to a plurality of gate lines (GL) according to the timing control of the display controller (140). The gate driving circuit (130) receives a first gate voltage corresponding to a turn-on level voltage and a second gate voltage corresponding to a turn-off level voltage along with various gate driving control signals (GCS), generates gate signals, and supplies the generated gate signals to a plurality of gate lines (GL). Here, the turn-on level voltage may be a high level voltage and the turn-off level voltage may be a low level voltage. Conversely, the turn-on level voltage may be a low level voltage and the turn-off level voltage may be a high level voltage.

[0059] In order to provide not only an image display function but also a touch sensing function, the touch display device (100) may include a touch panel and a touch sensing circuit (150) that senses the touch panel to detect whether a touch has occurred by a touch object such as a finger or a pen, or detects the touch location.

[0060] The touch sensing circuit (150) may include a touch driving circuit (160) that drives and senses a touch panel to generate and output touch sensing data, and a touch controller (170) that can detect the occurrence of a touch or detect a touch location using the touch sensing data.

[0061] A touch panel may include a plurality of touch electrodes (TE) as sensors. The touch panel may further include a plurality of touch routing wires (TRW) for electrically connecting the plurality of touch electrodes (TE) and a touch driving circuit (160). A touch panel or a touch electrode (TE) is also referred to as a touch sensor.

[0062] The touch panel may exist outside the display panel (110) or inside the display panel (110). If the touch panel exists outside the display panel (110), the touch panel is referred to as an external type. If the touch panel is an external type, the touch panel and the display panel (110) may be manufactured separately and combined. The external type touch panel may include a substrate and a plurality of touch electrodes (TE) on the substrate.

[0063] If the touch panel is located inside the display panel (110), the touch panel is said to be built-in. If the touch panel is built-in, the touch panel can be formed inside the display panel (110) during the manufacturing process of the display panel (110).

[0064] The touch driving circuit (160) can supply a touch driving signal to at least one of a plurality of touch electrodes (TE) and sense at least one of the plurality of touch electrodes (TE) to generate touch sensing data.

[0065] The touch sensing circuit (150) can perform touch sensing using a self-capacitance sensing method or a mutual-capacitance sensing method.

[0066] When the touch sensing circuit (150) performs touch sensing using a self-capacitance sensing method, the touch sensing circuit (150) can perform touch sensing based on the capacitance between each touch electrode (TE) and a touch object (e.g., finger, pen, etc.).

[0067] When the touch sensing circuit (150) performs touch sensing using a mutual-capacitance sensing method, the touch sensing circuit (150) can perform touch sensing based on the capacitance between the touch electrodes (TE).

[0068] According to the mutual-capacitance sensing method, a plurality of touch electrodes (TE) are divided into driving touch electrodes and sensing touch electrodes. A touch driving circuit (160) can drive the driving touch electrodes and sense the sensing touch electrodes.

[0069] According to the self-capacitance sensing method, each of the plurality of touch electrodes (TE) can act as both a driving touch electrode and a sensing touch electrode. The touch driving circuit (160) can drive all or part of the plurality of touch electrodes (TE) and sense all or part of the plurality of touch electrodes (TE).

[0070] For example, the touch driving circuit (160) and the touch controller (170) may be implemented as separate devices or as a single device.

[0071] For example, the touch driving circuit (160) and the data driving circuit (120) may be implemented as separate integrated circuits. Alternatively, all or part of the touch driving circuit (160) and all or part of the data driving circuit (120) may be integrated with each other to be implemented as a single integrated circuit.

[0072] For example, the touch display device (100) according to the embodiments of the present disclosure may be a self-emissive display including a light-emitting element in which the display panel (110) can emit light, such as an OLED (Organic Light Emitting Diode) display, a Quantum Dot display, a Micro LED (Micro Light Emitting Diode) display, etc.

[0073] FIG. 2 is an exemplary diagram of a touch sensing system of a touch display device (100) according to embodiments of the present disclosure.

[0074] As described above, the touch sensing system of the touch display device (100) according to the embodiments of the present disclosure may include a plurality of touch electrodes (TE), a plurality of touch routing wires (TRW), a touch driving circuit (160), a touch controller (170), etc.

[0075] Referring to FIG. 2, in a touch display device (100) according to embodiments of the present disclosure, the data driving circuit (120) may include a plurality of data driving units (DDRV), and the touch driving circuit (160) may include a plurality of touch driving units (TDRV).

[0076] Each of the multiple data driver units (DDRV) can be implemented as a separate integrated circuit. Each of the multiple touch driver units (TDRV) can be implemented as a separate integrated circuit.

[0077] Alternatively, at least one data driver (DDRV) and at least one touch driver (TDRV) may be integrated to be implemented as a single integrated integrated circuit (200).

[0078] According to this, a touch display device (100) according to embodiments of the present disclosure includes one or more integrated integrated circuits (200), and each integrated integrated circuit (200) may include at least one data driving unit (DDRV) and at least one touch driving unit (TDRV).

[0079] For example, in a touch display device (100) according to embodiments of the present disclosure, each of a plurality of integrated circuits (200) may be mounted on a circuit film (210). One side of the plurality of circuit films (210) on which the plurality of integrated circuits (200) are mounted may be electrically connected to a display panel (110). The other side of the plurality of circuit films (210) on which the plurality of integrated circuits (200) are mounted may be electrically connected to a printed circuit board (220).

[0080] Referring to FIG. 2, in a touch display device (100) according to embodiments of the present disclosure, each of a plurality of touch electrodes (TE) can be electrically connected to a touch driving unit (TDRV) through at least one touch routing wire (TRW).

[0081] A number of touch electrodes (TE) may all be located on the same layer, and a number of touch routing wires (TRW) may be located on a different layer from the number of touch electrodes (TE).

[0082] A plurality of touch electrodes (TE) may include a first touch electrode (TE1), a second touch electrode (TE2) adjacent to the first touch electrode (TE1) in a row direction, a third touch electrode (TE3) adjacent to the first touch electrode (TE1) in a column direction, and a fourth touch electrode (TE4) adjacent to the third touch electrode (TE3) in a row direction.

[0083] The first touch electrode (TE1) can be electrically connected to the first touch routing wire (TRW1), the second touch electrode (TE2) can be electrically connected to the second touch routing wire (TRW2), the third touch electrode (TE3) can be electrically connected to the third touch routing wire (TRW3), and the fourth touch electrode (TE4) can be electrically connected to the fourth touch routing wire (TRW4).

[0084] The first touch routing wire (TRW1) overlaps with the third touch electrode (TE3) but is not electrically connected to the third touch electrode (TE3). The second touch routing wire (TRW2) overlaps with the fourth touch electrode (TE4) but is not electrically connected to the fourth touch electrode (TE4).

[0085] Each of the multiple touch electrodes (TE) can overlap with one or more subpixels (SP).

[0086] For example, a single touch electrode (TE) may overlap with two or more subpixels (SP). That is, the area size of a single touch electrode (TE) may correspond to the area size of two or more subpixels (SP). In this case, each of the multiple touch electrodes (TE) may overlap with two or more data lines (DL) and may overlap with two or more gate lines (GL).

[0087] The first touch electrode (TE1) and the second touch electrode (TE2) are placed in the same row of touch electrodes and can overlap with two or more identical gate lines (GL). The third touch electrode (TE3) and the fourth touch electrode (TE4) are placed in the same row of touch electrodes and can overlap with two or more identical gate lines (GL).

[0088] The first touch electrode (TE1) and the third touch electrode (TE3) are placed in the same column of touch electrodes and can overlap with two or more identical data lines (DL). The second touch electrode (TE2) and the fourth touch electrode (TE4) are placed in the same column of touch electrodes and can overlap with two or more identical data lines (DL).

[0089] Each of the plurality of touch electrodes (TE) may be a mesh-type electrode having a plurality of openings formed therein. Each of the plurality of openings in each touch electrode (TE) may correspond to one or more light-emitting regions of a subpixel (SP) or to transparent regions (or transparent regions).

[0090] FIG. 3 is an equivalent circuit of a subpixel (SP) in a display panel (110) of a touch display device (100) according to embodiments of the present disclosure.

[0091] Referring to FIG. 3, each of the plurality of subpixels (SP) may include a light-emitting element (ED), a driving transistor (DT) for driving the light-emitting element (ED), a switching transistor (SWT) for switching whether there is an electrical connection between the gate electrode of the driving transistor (DT) and a data line (DL), and a storage capacitor (Cst) electrically connected between the gate electrode of the driving transistor (DT) and the source electrode or drain electrode of the driving transistor (DT).

[0092] The gate electrode of the driving transistor (DT) corresponds to the first node (n1). The source electrode or drain electrode of the driving transistor (DT) corresponds to the second node (n2). The drain electrode or source electrode of the driving transistor (DT) corresponds to the third node (n3).

[0093] A light-emitting element (ED) may include a pixel electrode (PE), a light-emitting layer (EL), and a common electrode (CE). The light-emitting layer (EL) may be located on the pixel electrode (PE), and the common electrode (CE) may be located on the light-emitting layer (EL). For example, the light-emitting element (ED) may be a device for a self-emissive display and may include an Organic Light Emitting Diode (OLED), a light-emitting element made of Quantum Dots, or a Micro Light Emitting Diode (Micro LED).

[0094] The drain electrode or source electrode of the switching transistor (SWT) may be electrically connected to a data line (DL). The source electrode or drain electrode of the switching transistor (SWT) may be electrically connected to the gate electrode of the driving transistor (DT) at the first node (n1). The gate electrode of the switching transistor (SWT) may be electrically connected to a scan signal line (SCL), which is a type of gate line (GL). The switching transistor (SWT) may be controlled to be on or off by a scan signal (SCAN) supplied from the scan signal line (SCL).

[0095] The storage capacitor (Cst) can be electrically connected between the first node (n1) and the second node (n2). The storage capacitor (Cst) can serve to maintain the voltage difference between the first node (n1) and the second node (n2) for a certain period of time (e.g., one frame time). The storage capacitor (Cst) is not an internal capacitor (parasitic capacitor) of the driving transistor (DT), but an external capacitor intentionally designed for driving the subpixel (SP).

[0096] In the above description, each subpixel (SP) is described as including two transistors (DT, SWT) and two capacitors (Cst) together with a light-emitting element (ED), but each subpixel (SP) may include one or more transistors and, in some cases, one or more capacitors.

[0097] For example, as shown in FIG. 3, each subpixel (SP) may further include a sensing transistor (SENT) that controls whether there is a connection between the second node (n2) and the reference voltage line (RVL).

[0098] The drain electrode or source electrode of the sensing transistor (SENT) may be electrically connected to the reference voltage line (RVL). The source electrode or drain electrode of the sensing transistor (SENT) may be electrically connected to the source electrode or drain electrode of the driving transistor (DT) at the second node (n2), and may also be electrically connected to the pixel electrode (PE). The gate electrode of the sensing transistor (SENT) may be electrically connected to the sense signal line (SENL), which is a type of gate line (GL). The sensing transistor (SENT) may be controlled to turn on and off by the sense signal (SENSE) supplied from the sense signal line (SENL).

[0099] Referring to FIG. 3, a pixel electrode (PE) is placed for each of the multiple subpixels (SP) and can be electrically connected to the source electrode or drain electrode of the driving transistor (DT). That is, at the second node (n2), the pixel electrode (PE) can be electrically connected to the source electrode or drain electrode of the driving transistor (DT).

[0100] A common electrode (CE) can be placed in common across multiple subpixels (SP). A base voltage (EVSS) in the form of a DC voltage with no fluctuation in voltage level can be applied to the common electrode (CE). Here, the base voltage (EVSS) may correspond to a common voltage applied in common to the light-emitting elements (ED) of all subpixels (SP).

[0101] Referring to FIG. 3, the display panel (110) of the touch display device (100) according to embodiments of the present disclosure may further include a plurality of base wires (EVSL) electrically connected to a common electrode (CE).

[0102] By using multiple base wires (EVSL), the base voltage (EVSS) can be uniformly applied to the entire area of ​​the common electrode (CE). The method of supplying the base voltage (EVSS) using multiple base wires (EVSL) can provide an effective supply of the base voltage (EVSS) when a large area common electrode (CE) is provided due to a large area display panel (110).

[0103] FIGS. 4 and 5 are drawings showing a connection structure between a common electrode (CE) and a plurality of base wires (EVSL) in a display panel (110) of a touch display device (100) according to embodiments of the present disclosure.

[0104] Referring to FIGS. 4 and 5, a plurality of base lines (EVSL) may be spaced apart from a plurality of data lines (DL) and may be arranged parallel to the plurality of data lines (DL) so as not to intersect with the plurality of data lines (DL).

[0105] For example, each of the multiple base lines (EVSL) may be placed for every one subpixel column. Or, each of the multiple base lines (EVSL) may be placed for every two or more subpixel columns. Or, each of the multiple base lines (EVSL) may be placed for every one pixel column or every two or more subpixel columns. Here, one pixel column may include two subpixel columns, three subpixel columns, or four subpixel columns.

[0106] Referring to FIGS. 4 and 5, each of the plurality of base wires (EVSL) can be electrically connected to a common electrode (CE) in one or more contact holes (CNT). Thus, a base voltage (EVSS) can be applied together to the plurality of base wires (EVSL) and the common electrode (CE).

[0107] For example, as shown in FIG. 4, one base wire (EVSL) can be electrically connected to a common electrode (CE) through two contact holes (CNT). The two contact holes (CNT) electrically connected to the one base wire (EVSL) and the common electrode (CE) can be located at an upper point and a lower point.

[0108] Therefore, by applying the base voltage (EVSS) to both the upper and lower points of the common electrode (CE), the base voltage (EVSS) can be applied uniformly to the common electrode (CE).

[0109] As another example, as illustrated in FIG. 5, one base wire (EVSL) can be electrically connected to a common electrode (CE) through three or more contact holes (CNT). The three or more contact holes (CNT) electrically connected to the one base wire (EVSL) and the common electrode (CE) can be located at an upper point, a lower point, and one or more intermediate points.

[0110] Therefore, by applying the base voltage (EVSS) together to the top point, bottom point, and one or more intermediate points of the common electrode (CE), the base voltage (EVSS) can be applied more uniformly to the common electrode (CE).

[0111] FIG. 6 is a cross-sectional view of a display panel (110) of a touch display device (100) according to embodiments of the present disclosure.

[0112] Referring to FIG. 6, the display panel (110) of the touch display device (100) includes a substrate (SUB). A plurality of subpixels (SP) are formed on the substrate (SUB). Each of the plurality of subpixels (SP) may include a light-emitting element (ED) comprising a pixel electrode (PE), a light-emitting layer (EL), and a common electrode (CE), a driving transistor (DT) that drives the light-emitting element (ED), a switching transistor (SWT) that controls the connection between the gate electrode of the driving transistor (DT) and a data line (DL), and a storage capacitor (Cst) connected between the gate electrode of the driving transistor (DT) and the pixel electrode (PE).

[0113] Referring to FIG. 6, transistors (DT, SWT, SENT) and a capacitor (Cst) may be formed on a substrate (SUB), and light-emitting elements (ED) may be formed. An encapsulation layer (ENCAP) may be formed on the common electrode (CE) of the light-emitting elements (ED). The encapsulation layer (ENCAP) can prevent oxygen or moisture from penetrating into the light-emitting elements (ED).

[0114] Referring to FIG. 6, in the display panel (110) of the touch display device (100) according to embodiments of the present disclosure, a plurality of touch electrodes (TE) may be disposed on the encapsulation layer (ENCAP). Additionally, in the display panel (110) of the touch display device (100) according to embodiments of the present disclosure, a color filter (CF) may be disposed on the encapsulation layer (ENCAP).

[0115] In addition, in the display panel (110) of the touch display device (100) according to the embodiments of the present disclosure, the vertical position between the touch electrode (TE) and the color filter (CF) located on the encapsulation layer (ENCAP) can be designed in various ways. For example, the color filter (CF) may be placed on the encapsulation layer (ENCAP), and the touch electrode (TE) may be placed on the color filter (CF). As another example, the touch electrode (TE) may be placed on the encapsulation layer (ENCAP), and the color filter (CF) may be placed on the touch electrode (TE).

[0116] Below, the cross-sectional structure of the display panel (110) is described in more detail with reference to FIG. 6. In FIG. 6, the sensing transistor (SENT) is omitted for convenience of explanation. Also, in FIG. 6, it is assumed that the source electrode (S1) of the driving transistor (DT) is electrically connected to the pixel electrode (PE), and the drain electrode (D2) of the switching transistor (SWT) is connected to the data line (DL).

[0117] Referring to Fig. 6, shield layers (SHD) can be disposed on a substrate (SUB).

[0118] A buffer layer (BUF) can be placed on the shield layers (SHD).

[0119] A switching transistor (SWT) and a driving transistor (DT) may be formed on the buffer layer (BUF). A sensing transistor (SENT) may also be formed on the buffer layer (BUF).

[0120] The semiconductor layer (ACT1) of the driving transistor (DT) and the semiconductor layer (ACT2) of the switching transistor (SWT) can be formed on the buffer layer (BUF).

[0121] The semiconductor layer (ACT1) of the driving transistor (DT) may include a channel portion (CH1), a source connection portion (CS1) located on one side of the channel portion (CH1), and a drain connection portion (CD1) located on the other side of the channel portion (CH1). Here, the source connection portion (CS1) and the drain connection portion (CD1) may be portions in which the semiconductor material is conductive.

[0122] The semiconductor layer (ACT2) of the switching transistor (SWT) may include a channel portion (CH2), a source connection portion (CS2) located on one side of the channel portion (CH2), and a drain connection portion (CD2) located on the other side of the channel portion (CH2). Here, the source connection portion (CS2) and the drain connection portion (CD2) may be portions in which the semiconductor material is conductive.

[0123] One of the shield layers (SHD) formed below the buffer layer (BUF) may overlap with at least one of the channel portion (CH1) of the semiconductor layer (ACT1) of the driving transistor (DT) and the channel portion (CH2) of the semiconductor layer (ACT2) of the switching transistor (SWT). Accordingly, at least one of the channel portion (CH1) of the semiconductor layer (ACT1) of the driving transistor (DT) and the channel portion (CH2) of the semiconductor layer (ACT2) of the switching transistor (SWT) is blocked from being exposed to light (external light or internal light), thereby preventing a change in channel characteristics.

[0124] A gate insulating film (GI) may be disposed on the semiconductor layer (ACT1) of the driving transistor (DT) and the semiconductor layer (ACT2) of the switching transistor (SWT). The gate electrode (G1) of the driving transistor (DT) and the gate electrode (G2) of the switching transistor (SWT) may be located on the gate insulating film (GI). The gate electrode (G1) of the driving transistor (DT) may overlap with the channel portion (CH1) of the semiconductor layer (ACT1) of the driving transistor (DT). The gate electrode (G2) of the switching transistor (SWT) may overlap with the channel portion (CH2) of the semiconductor layer (ACT2) of the switching transistor (SWT).

[0125] A first interlayer insulating film (ILD1) can be disposed on the gate electrode (G1) of the driving transistor (DT) and the gate electrode (G2) of the switching transistor (SWT).

[0126] The source electrode (S1) and drain electrode (D1) of the driving transistor (DT) may be disposed on the first interlayer insulating film (ILD1). The source electrode (S1) of the driving transistor (DT) may be electrically contacted with the source connection portion (CS1) within the semiconductor layer (ACT1) of the driving transistor (DT) through the contact hole of the first interlayer insulating film (ILD1). The drain electrode (D1) of the driving transistor (DT) may be electrically contacted with the drain connection portion (CD1) within the semiconductor layer (ACT1) of the driving transistor (DT) through the contact hole of the first interlayer insulating film (ILD1).

[0127] The source electrode (S2) and drain electrode (D2) of a switching transistor (SWT) may be disposed on the first interlayer insulating film (ILD1). The source electrode (S2) of the switching transistor (SWT) may be electrically contacted with the source connection portion (CS2) within the semiconductor layer (ACT2) of the switching transistor (SWT) through the contact hole of the first interlayer insulating film (ILD1). The drain electrode (D2) of the switching transistor (SWT) may be electrically contacted with the drain connection portion (CD2) within the semiconductor layer (ACT2) of the switching transistor (SWT) through the contact hole of the first interlayer insulating film (ILD1).

[0128] Referring to FIG. 6, a base wire (EVSL) may be placed on a first interlayer insulating film (ILD1). The base wire (EVSL) may be connected to a shield layer (SHD) located below the base wire (EVSL) through contact holes in the first interlayer insulating film (ILD1) and a buffer layer (BUF). Due to the connection between the base wire (EVSL) and the shield layer (SHD), the resistance of the base wire (EVSL) may be reduced.

[0129] A passivation layer (PAS) can be disposed over source electrodes (S1, S2), drain electrodes (D1, D2), and base wiring (EVSL) formed on the first interlayer insulating film (ILD1).

[0130] An overcoat layer (OC) may be placed on the passivation layer (PAS). The overcoat layer (OC) may be placed at a location that overlaps with the light-emitting region (EA) of the subpixel (SP). The overcoat layer (OC) may also be placed in a dam shape at a location that does not overlap with the light-emitting region (EA).

[0131] At a point defined as the light-emitting region (EA) of a subpixel (SP), a pixel electrode (PE) may be placed on the overcoat layer (OC). The pixel electrode (PE) may be electrically connected to the source electrode (S1) of a driving transistor (DT) through contact holes in the overcoat layer (OC) and the passivation layer (PAS).

[0132] A bank for defining the light-emitting region (EA) of a subpixel (SP) may be placed on the pixel electrode (PE). A portion of the bank is open so that a portion of the pixel electrode (PE) is exposed. The open portion of the bank may correspond to the light-emitting region (EA).

[0133] A light-emitting layer (EL) can be placed on a pixel electrode (PE) exposed to an open area of ​​the bank. A common electrode (CE) can be placed on the light-emitting layer (EL).

[0134] Referring to FIG. 6, a contact hole (CNT) for connection with the base wiring (EVSL) is formed in the passivation layer (PAS). Near the contact hole (CNT) of the passivation layer (PAS) for electrical connection between the common electrode (CE) and the base wiring (EVSL), the common electrode (CE) may be broken or have a through hole (hole). The contact hole (CNT) of the passivation layer (PAS) for electrical connection between the common electrode (CE) and the base wiring (EVSL) may include a relatively large first contact hole (CNT1) and a relatively small second contact hole (CNT2).

[0135] The first contact hole (CNT1) of the passivation layer (PAS) for electrical connection between the common electrode (CE) and the base wiring (EVSL) has a much larger width (diameter of the hole when viewed from above) than the contact hole of the passivation layer (PAS) for electrical connection between the pixel electrode (PE) and the source electrode (S1) of the driving transistor (DT).

[0136] A portion of the base wiring (EVSL) may be exposed relatively widely through a first contact hole (CNT1) formed in the passivation layer (PAS). A portion of the base wiring (EVSL) may be exposed slightly through a second contact hole (CNT2) formed in the passivation layer (PAS).

[0137] A portion of the common electrode (CE) can be electrically connected to a portion of the base wiring (EVSL) through a first contact hole (CNT1) of the passivation layer (PAS). Another portion of the common electrode (CE) can be electrically connected to another portion of the base wiring (EVSL) through a second contact hole (CNT2) of the passivation layer (PAS).

[0138] When another part of the common electrode (CE) is electrically connected to another part of the base wiring (EVSL) through the second contact hole (CNT2) of the passivation layer (PAS), it may also be connected through a reflector (RP). Here, the reflector (RP) may be a layer formed of the same material as the pixel electrode (PE) when the pixel electrode (PE) is formed.

[0139] Referring to FIG. 6, an encapsulation layer (ENCAP) may be disposed on a common electrode (CE). The encapsulation layer (ENCAP) can block external moisture or oxygen from penetrating into a light-emitting element (ED) that is vulnerable to external moisture or oxygen. The encapsulation layer (ENCAP) may be a single layer, but may also consist of multiple layers.

[0140] For example, the encapsulation layer (ENCAP) may include one or more inorganic encapsulation layers and one or more organic encapsulation layers.

[0141] As a specific example, the encapsulation layer (ENCAP) may be composed of a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence. The first inorganic encapsulation layer may be formed on a substrate (SUB) having a common electrode (CE) formed so as to be closest to the light-emitting element (ED). For example, the first inorganic encapsulation layer may be formed from an inorganic insulating material capable of low-temperature deposition, such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3). The first inorganic encapsulation layer can prevent damage to the light-emitting layer (EL), which contains organic materials susceptible to high-temperature atmospheres, during the deposition process. The organic encapsulation layer may be formed with an area smaller than that of the first inorganic encapsulation layer. The organic encapsulation layer may be formed to expose both ends of the first inorganic encapsulation layer. The organic encapsulation layer acts as a buffer to relieve stress between each layer due to bending of the touch display device (100), which may be an organic light-emitting display device, and can also serve to enhance flattening performance. For example, the organic encapsulation layer may be formed from an organic insulating material such as acrylic resin, epoxy resin, polyimide, polyethylene, or silicon oxycarbon (SiOC). The second inorganic encapsulation layer may be formed on a substrate (SUB) on which the organic encapsulation layer is formed to cover the upper surface and side of each of the organic encapsulation layer and the first inorganic encapsulation layer. The second inorganic encapsulation layer minimizes or blocks external moisture or oxygen from penetrating into the first inorganic encapsulation layer and the organic encapsulation layer.

[0142] Referring to FIG. 6, a touch buffer film (T-BUF) may be disposed on an encapsulation layer (ENCAP). The touch buffer film (T-BUF) may be designed to maintain a predetermined minimum separation distance (e.g., 5 μm) between the touch sensor metal and the common electrode (CE) of the light-emitting element (ED). Accordingly, parasitic capacitance formed between the touch sensor metal and the common electrode (CE) of the light-emitting element (ED) can be reduced or prevented, thereby preventing a decrease in touch sensitivity caused by parasitic capacitance. In addition, the touch buffer film (T-BUF) can block chemicals (developer or etching solution, etc.) used during the manufacturing process of the touch sensor metal disposed on the touch buffer film (T-BUF) or moisture from the outside from penetrating into the light-emitting layer (EL) containing organic material.

[0143] The touch buffer film (T-BUF) is formed from an organic insulating material having a low dielectric constant of 1 to 3 and capable of being formed at a low temperature (e.g., 100°C) or lower to prevent damage to the light-emitting layer (EL) containing organic material that is vulnerable to high temperatures. For example, the touch buffer film (T-BUF) can be formed from an acrylic-based, epoxy-based, or siloxane-based material. The touch buffer film (T-BUF), which has flattening performance as an organic insulating material, can prevent damage to each encapsulation layer within the encapsulation layer (ENCAP) due to bending of the touch display device (100) and breakage of the touch sensor metal formed on the touch buffer film (T-BUF).

[0144] The aforementioned touch buffer film (T-BUF) is not essential and may be omitted depending on the case.

[0145] The touch electrode (TE) can be placed on the touch buffer film (T-BUF) or directly on the encapsulation layer (ENCAP). The touch electrode (TE) shown in FIG. 6 is depicted as a mesh type.

[0146] A second interlayer insulating film (ILD2) may be disposed on the touch electrode (TE). A color filter (CF) may be disposed on the second interlayer insulating film (ILD2), and a black matrix may also be disposed together with the color filter (CF). Here, the color filter (CF) and the black matrix may be optionally disposed components.

[0147] A protective layer (PAC) may be placed on a color filter (CF). The protective layer (PAC) may be bonded to a cover glass (CG) through an adhesive layer (OCA). An anti-reflective film (ARF) may be placed on the cover glass (CG). Here, the anti-reflective film (ARF) may be a film that can be optionally placed.

[0148] FIG. 6 is a cross-sectional view of a display area (DA). Near the boundary of the non-display area (NDA) of the display area (DA) of the display panel (110), the encapsulation layer (ENCAP) may include an outer slope. The display panel (110) may further include a dam portion located in the area where the outer slope of the encapsulation layer (ENCAP) ends, and a pad portion located in the non-display area (NDA) and further outward than the dam portion. A touch routing wire (TRW) may descend along the outer slope of the encapsulation layer (ENCAP), pass over the top of the dam portion, and be electrically connected to the pad portion.

[0149] The dam portion may include one or more dams, which can prevent the liquid organic encapsulation layer from collapsing toward the non-display area (NDA) and encroaching upon the pad portion when the liquid organic encapsulation layer is deposited on the display area (DA). This effect may be further enhanced when the dam portion includes multiple dams.

[0150] The dam-forming material layer of the dam portion may include the same material as a bank for separating subpixels (SP) from each other, or the same material as a spacer for maintaining interlayer spacing. The dam portion may have a structure in which a first inorganic encapsulation layer and / or a second inorganic encapsulation layer are stacked on the dam-forming material layer.

[0151] Referring to Fig. 6, the base wiring (EVSL) is located below the common electrode (CE) and can be electrically connected to the common electrode (CE).

[0152] Referring to FIG. 6, at least one of the plurality of base wires (EVSL) may have a potential difference with an adjacent data line (DL). Alternatively, at least one of the plurality of base wires (EVSL) may have a potential difference with one electrode (in the case of FIG. 6, the drain electrode (D2)) connected to the adjacent data line (DL) among the source electrode (S2) and drain electrode (D2) of an adjacent switching transistor (SWT).

[0153] Referring to FIG. 6, a passivation layer (PAS) may be disposed as at least one insulating layer on a plurality of base wires (EVSL). The passivation layer (PAS) corresponding to at least one insulating layer has a plurality of contact holes (CNT1, CNT2), and a common electrode (CE) may be electrically connected to a portion of the plurality of base wires (EVSL) exposed through the plurality of contact holes (CNT1, CNT2).

[0154] Each of the plurality of base wires (EVSL) may be located in the same layer as at least one of the source electrode (S2), drain electrode (D2), and gate electrode (G2) of the switching transistor (SWT) included in the adjacent subpixel (SP). In the example of FIG. 6, each of the plurality of base wires (EVSL) may be located in the same layer as the source electrode (S2) and drain electrode (D2) of the switching transistor (SWT) included in the adjacent subpixel (SP), and may include the same material as the source electrode (S2) and drain electrode (D2) of the switching transistor (SWT).

[0155] Referring to FIG. 6, region X may be a region between the light-emitting region (EA) of an illustrated subpixel (SP) and the light-emitting region (EA) of another subpixel (SP). If the touch display device (100) according to embodiments of the present disclosure is a transparent display, region X may be a transparent region (or also referred to as a transparent region).

[0156] When a touch is driven, various capacitances (Cf, Cp, Cc) may be formed in the display panel (110). Below, with reference to FIG. 7, various capacitances (Cf, Cp, Cc) formed within the display panel (110) will be described.

[0157] FIGS. 7 and 8 are drawings for explaining common electrode ripple noise (CE Ripple Noise) induced in a common electrode (CE) by touch driving and the effect of common electrode ripple noise in a display panel (110) of a touch display device (100) according to embodiments of the present disclosure.

[0158] Referring to FIG. 7, the touch driver (TDRV) may include one or more preamplifiers (PRE-AMP). The preamplifier (PRE-AMP) may include a non-inverting input terminal (IN) into which a touch driver signal (TDS) is input, an inverting input terminal (INR) electrically connected to a touch electrode (TE), an output terminal (OUT) that outputs an output signal, and a feedback capacitor (Cfb) connected between the non-inverting input terminal (IN) and the output terminal (OUT).

[0159] The touch driving signal (TDS) may be a signal with a fluctuating voltage level and may have a predetermined frequency and amplitude.

[0160] Referring to FIGS. 6 and 7, when a user touches the screen using a finger or a pen, a capacitance (Cf) may be formed between the finger or pen and the touch electrode (TE). This capacitance (Cf) is called finger capacitance (Cf).

[0161] The touch sensing circuit (150) of the touch display device (100) can sense touch coordinates based on changes in finger capacitance (Cf) at each touch electrode (TE).

[0162] Referring to FIGS. 6 and 7, the common electrode (CE) and the touch electrode (TE) can be coupled in a capacitive manner. Therefore, when a potential difference occurs between the common electrode (CE) and the touch electrode (TE), a parasitic capacitance (Cp) can be formed between the common electrode (CE) and the touch electrode (TE).

[0163] Referring to FIGS. 6 and 7, the base wire (EVSL) may be spaced apart from the adjacent data line (DL) and arranged parallel to the data line (DL). Additionally, the base wire (EVSL) may be arranged adjacent to a switching transistor (SWT) having an electrode (drain electrode (D2) or source electrode (S2)) connected to the data line (DL).

[0164] According to this structure, the base wire (EVSL) to which the base voltage (EVSS) is applied and the data line (DL) to which the data signal (Vdata) is applied can be capacitively coupled. Alternatively, the base wire (EVSL) to which the base voltage (EVSS) is applied and one electrode (drain electrode or source electrode) of the switching transistor (SWT) can be capacitively coupled. Here, the data line (DL) can be electrically connected to one electrode (drain electrode or source electrode) of the switching transistor (SWT).

[0165] Therefore, a coupling capacitance (Cc) can be formed between the base wire (EVSL) and the data line (DL). Alternatively, a coupling capacitance (Cc) can be formed between the base wire (EVSL) and one electrode (drain electrode or source electrode) of the switching transistor (SWT).

[0166] Referring to FIGS. 6 to 8, when a touch driving signal (TDS) with a fluctuating voltage level is applied to a touch electrode (TE), ripple noise may occur in the common electrode (CE) at every timing when the voltage level of the touch driving signal (TDS) fluctuates. Below, the ripple noise generated in the common electrode (CE) due to the fluctuation in the voltage level of the touch driving signal (TDS) is referred to as common electrode ripple noise.

[0167] Referring to FIG. 8, when the voltage level of the touch driving signal (TDS) rises, the common electrode ripple noise has a positive polarity (or a negative polarity), and when the voltage level of the touch driving signal (TDS) falls, the common electrode ripple noise may have a negative polarity (or a positive polarity).

[0168] Accordingly, positive and negative peaks may occur in the base voltage (EVSS) applied to the common electrode (CE) based on the base voltage value. The positive and negative peaks are caused by common electrode ripple noise and may occur at the timing when the voltage level of the touch driving signal (TDS) rises or falls.

[0169] Referring to FIGS. 6 and 7, common electrode ripple noise generated at the common electrode (CE) due to voltage level fluctuations of the touch driving signal (TDS) can be transmitted to a data line (DL) coupled capacitively with the base wiring (EVSL). Here, the data line (DL) can be connected to the drain electrode or source electrode of the switching transistor (SWT).

[0170] As common electrode ripple noise is transmitted to the data line (DL), positive and negative peaks corresponding to the common electrode ripple noise occur in the data signal (Vdata) applied to the data line (DL).

[0171] According to the timing of the scan signals (SCAN1, SCAN2, SCAN3, SCAN4), some of the data voltages (V1, V2, V3, V4) used for pixel charging (V3, V4) may differ from the voltage values ​​of the others (V1, V2) due to common electrode ripple noise. This can cause differences in pixel charging, resulting in abnormal phenomena where horizontal lines appear brighter or darker than the surroundings, which leads to a degradation of image quality.

[0172] FIG. 9 is a drawing showing a non-inverted driving method of touch driving of a touch display device (100) according to embodiments of the present disclosure.

[0173] Referring to FIG. 9, the touch driving units (TDRV1~TDRV7) included in the touch driving circuit (160) can perform touch driving by receiving touch driving signals (TDS) and supplying them to touch electrodes (TE).

[0174] Each of the touch drivers (TDRV1 to TDRV7) may include one or more preamplifiers (PRE-AMP). Additionally, each of the touch drivers (TDRV1 to TDRV7) may include a multiplexer circuit that selects one or more of a plurality of touch electrodes (TE) and connects them to one or more preamplifiers (PRE-AMP).

[0175] During the first driving period, the touch driving units (TDRV1~TDRV7) can supply a touch driving signal (TDS) to the touch electrodes (TE) arranged in the first row of touch electrodes or supply a touch driving signal (TDS) to all touch electrodes (TE), and can sense the touch electrodes (TE) arranged in the first row of touch electrodes.

[0176] During the second driving period, the touch driving units (TDRV1~TDRV7) can supply a touch driving signal (TDS) to the touch electrodes (TE) arranged in the second row of touch electrodes or supply a touch driving signal (TDS) to all touch electrodes (TE), and can sense the touch electrodes (TE) arranged in the second row of touch electrodes.

[0177] During the third driving period, the touch driving units (TDRV1~TDRV7) can supply a touch driving signal (TDS) to the touch electrodes (TE) arranged in the third row of touch electrodes or supply a touch driving signal (TDS) to all touch electrodes (TE), and can sense the touch electrodes (TE) arranged in the third row of touch electrodes.

[0178] During the fourth driving period, the touch driving units (TDRV1~TDRV7) can supply a touch driving signal (TDS) to the touch electrodes (TE) arranged in the fourth row of touch electrodes or supply a touch driving signal (TDS) to all touch electrodes (TE), and sense the touch electrodes (TE) arranged in the fourth row of touch electrodes.

[0179] Referring to FIG. 9, the touch driving signals (TDS) output from each of the touch driving units (TDRV1 to TDRV7) may have the same phase. That is, the touch driving signals (TDS) output from each of the touch driving units (TDRV1 to TDRV7) may have the same polarity at the same time.

[0180] Therefore, the touch driving signal (TDS) applied to the touch electrodes (TE) can have the same phase. That is, the polarity of the touch driving signal (TDS) applied to the touch electrodes (TE) at the same time can be the same.

[0181] Accordingly, the polarity change of the common electrode ripple noise generated at the common electrode (CE) by the touch driving signals (TDS) output from each of the touch driving units (TDRV1~TDRV7) is also the same. Therefore, the base voltage (EVSS) applied to the common electrode (CE) is significantly affected by the common electrode ripple noise, and the light-emitting element (ED) may not operate normally. In addition, the base wiring (EVSL) connected to the common electrode (CE) is coupled with the data line (DL), so the common electrode ripple noise also has an adverse effect on the data line (DL), and pixel charging may not be performed normally.

[0182] Below, we present methods to prevent or minimize common electrode ripple noise in the common electrode (CE) despite voltage level fluctuations of the touch driving signal (TDS).

[0183] Below, with reference to FIGS. 10 and 11, a method for removing common electrode ripple noise from the common electrode (CE) using an inversion driving method is described. With reference to FIGS. 12 and 13, a method for minimizing the influence of common electrode ripple noise using a driving area division method is described. With reference to FIGS. 14 and 15, a method for minimizing the influence of common electrode ripple noise on the display frame using a driving frequency control method is described. With reference to FIGS. 16 and 17, a method for blocking the phenomenon in which common electrode ripple noise distorts the data signal (Vdata) using a coupling blocking method is described.

[0184] FIG. 10 is a diagram showing a column inversion touch drive for removing common electrode ripple noise in a touch display device (100) according to embodiments of the present disclosure. FIG. 11 is a diagram showing a dot inversion touch drive for removing common electrode ripple noise in a touch display device (100) according to embodiments of the present disclosure.

[0185] Referring to FIG. 10 and FIG. 11, a touch display device (100) according to embodiments of the present disclosure can remove common electrode ripple noise from a common electrode (CE) using an inversion driving method.

[0186] Referring to FIGS. 10 and 11, a plurality of touch electrodes (TE) disposed on a display panel (110) may include a first touch electrode (TE1), a second touch electrode (TE2) adjacent to the first touch electrode (TE1) in a row direction, a third touch electrode (TE3) adjacent to the first touch electrode (TE1) in a column direction, and a fourth touch electrode (TE4) adjacent to the second touch electrode (TE2) in a column direction.

[0187] The first touch electrode (TE1) and the second touch electrode (TE2) may be adjacent to each other in the row direction and included in the first touch electrode row, and the third touch electrode (TE3) and the fourth touch electrode (TE4) may be adjacent to each other in the row direction and included in the second touch electrode row. The first touch electrode (TE1) and the third touch electrode (TE3) may be adjacent to each other in the column direction and included in the first touch electrode column, and the second touch electrode (TE2) and the fourth touch electrode (TE4) may be adjacent to each other in the column direction and included in the second touch electrode column.

[0188] Referring to FIGS. 10 and 11, the touch driving circuit (160) can supply a first touch driving signal (TDS1), which has a voltage level that varies, to a first touch electrode (TE1), and a second touch driving signal (TDS2), which has a voltage level that varies and has the same frequency as the first touch driving signal (TDS1), and has an inverted polarity compared to the first touch driving signal (TDS1), to a second touch electrode (TE2).

[0189] Referring to FIGS. 10 and 11, the first touch driving unit (TDRV1) of the touch driving circuit (160) can supply a first touch driving signal (TDS1) with a fluctuating voltage level to the first touch electrode (TE1). When the first touch driving unit (TDRV1) of the touch driving circuit (160) supplies the first touch driving signal (TDS1) to the first touch electrode (TE1), the second touch driving unit (TDRV2) of the touch driving circuit (160) can supply a second touch driving signal (TDS2) to the second touch electrode (TE2) with the same frequency as the first touch driving signal (TDS1), a fluctuating voltage level, and a polarity inverted compared to the first touch driving signal (TDS1).

[0190] Referring to FIGS. 10 and 11, the first touch driving unit (TDRV1) may include a preamplifier (PRE-AMP) that receives a first touch driving signal (TDS1), supplies the received first touch driving signal (TDS1) to a first touch electrode (TE1), and detects a signal from the first touch electrode (TE1).

[0191] The second touch driving unit (TDRV2) may include a preamplifier (PRE-AMP) that receives a second touch driving signal (TDS2), supplies the received second touch driving signal (TDS2) to a second touch electrode (TE2), and detects a signal from the second touch electrode (TE2).

[0192] The fact that the first touch driving signal (TDS1) and the second touch driving signal (TDS2), which are applied to the first touch electrode (TE1) and the second touch electrode (TE2) adjacent in the row direction, have opposite polarities may mean that the phase between the first touch driving signal (TDS1) and the second touch driving signal (TDS2) is opposite. The fact that the phase between the first touch driving signal (TDS1) and the second touch driving signal (TDS2) is opposite may mean that the phase difference between the first touch driving signal (TDS1) and the second touch driving signal (TDS2) is half a wavelength.

[0193] Accordingly, when the voltage level of the first touch driving signal (TDS1) rises, the voltage level of the second touch driving signal (TDS2) falls. When the voltage level of the first touch driving signal (TDS1) falls, the voltage level of the second touch driving signal (TDS2) rises.

[0194] Accordingly, the polarity of the common electrode ripple noise generated in the base voltage (EVSS) applied to the common electrode (CE) due to the voltage level fluctuation of the first touch driving signal (TDS1) and the polarity of the common electrode ripple noise generated in the base voltage (EVSS) applied to the common electrode (CE) due to the voltage level fluctuation of the second touch driving signal (TDS2) are opposite to each other.

[0195] Accordingly, common electrode ripple noise generated in the base voltage (EVSS) applied to the common electrode (CE) due to voltage level fluctuations of the first touch driving signal (TDS1) and common electrode ripple noise generated in the base voltage (EVSS) applied to the common electrode (CE) due to voltage level fluctuations of the second touch driving signal (TDS2) can be canceled out and eliminated. Therefore, the voltage state of the common electrode (CE) can be maintained as a base voltage (EVSS) in the form of a constant DC voltage.

[0196] As described above, the touch display device (100) can remove common electrode ripple noise from the common electrode (CE) by using an inversion driving method.

[0197] Assuming that adjacent touch electrodes (TE) in the row direction are driven simultaneously at the same time, the inversion driving method may include the column inversion driving method of FIG. 10 and the dot inversion driving method of FIG. 11.

[0198] Alternatively, assuming that adjacent touch electrodes (TEs) in the column direction are driven simultaneously at the same time, the inversion driving method may include a row inversion driving method and a dot inversion driving method. In this specification, rows and columns must be regarded as relative.

[0199] Referring to FIG. 10, the touch driving circuit (160) can perform column inversion driving. That is, the touch driving circuit (160) can supply a touch driving signal (TDS) with opposite polarity to two adjacent columns of touch electrodes in the row direction.

[0200] Referring to FIG. 10, when the touch driving circuit (160) supplies a first touch driving signal (TDS1) to a first touch electrode (TE1) through a first touch routing wire (TRW1) and supplies a second touch driving signal (TDS2) having an inverted polarity compared to the first touch driving signal (TDS1) to a second touch electrode (TE2) through a second touch routing wire (TRW2), the touch driving circuit (160) can supply a third touch driving signal (TDS3) having the same frequency as the first touch driving signal (TDS1) and the same polarity as the first touch driving signal (TDS1) to a third touch electrode (TE3) through a third touch routing wire (TRW3), and supply a fourth touch driving signal (TDS4) having the same frequency as the second touch driving signal (TDS2) and the same polarity as the second touch driving signal (TDS2) to a fourth touch electrode (TE4) through a fourth touch routing wire (TRW4).

[0201] Referring to FIG. 10, due to the polarity inversion between the first and third touch driving signals (TDS1, TDS3) and the second and fourth touch driving signals (TDS2, TDS4), the common electrode ripple noise (RN1) generated at the common electrode (CE) by the first and third touch driving signals (TDS1, TDS3) and the common electrode ripple noise (RN2) generated at the common electrode (CE) by the second touch driving signal (TDS2) may have different polarities. Accordingly, at the common electrode (CE), the common electrode ripple noises of opposite polarities are canceled out, and the base voltage (EVSS) at the common electrode (CE) takes the form of a DC voltage in which the voltage level does not fluctuate.

[0202] Referring to FIG. 11, the touch driving circuit (160) can perform dot inversion driving. That is, the touch driving circuit (160) can supply a touch driving signal (TDS) of opposite polarity to all touch electrodes (TE) adjacent in the row direction and column direction.

[0203] Referring to FIG. 11, the touch driving circuit (160) can supply a first touch driving signal (TDS1) to a first touch electrode (TE1) through a first touch routing wire (TRW1), and supply a second touch driving signal (TDS2) having a polarity inverted compared to the first touch driving signal (TDS1) to a second touch electrode (TE2) through a second touch routing wire (TRW2), supply a third touch driving signal (TDS3) having the same frequency as the second touch driving signal (TDS2) and the same polarity as the second touch driving signal (TDS2) to a third touch electrode (TE3) through a third touch routing wire (TRW3), and supply a fourth touch driving signal (TDS4) having the same frequency as the first touch driving signal (TDS1) and the same polarity as the first touch driving signal (TDS1) to a fourth touch electrode (TE4) through a fourth touch routing wire (TRW4).

[0204] Referring to FIG. 11, due to the polarity inversion between the first touch driving signal (TDS1) and the second touch driving signal (TDS2), the common electrode ripple noise (RN1) generated at the common electrode (CE) by the first touch driving signal (TDS1) and the common electrode ripple noise (RN2) generated at the common electrode (CE) by the second touch driving signal (TDS2) may have different polarities.

[0205] In addition, due to the polarity inversion between the third touch driving signal (TDS3) and the fourth touch driving signal (TDS4), the common electrode ripple noise (RN3) generated at the common electrode (CE) by the third touch driving signal (TDS3) and the common electrode ripple noise (RN4) generated at the common electrode (CE) by the fourth touch driving signal (TDS4) may have different polarities.

[0206] In addition, due to the polarity inversion between the first touch driving signal (TDS1) and the third touch driving signal (TDS3), the common electrode ripple noise (RN1) generated at the common electrode (CE) by the first touch driving signal (TDS1) and the common electrode ripple noise (RN3) generated at the common electrode (CE) by the third touch driving signal (TDS3) may have different polarities.

[0207] In addition, due to the polarity inversion between the second touch driving signal (TDS2) and the fourth touch driving signal (TDS4), the common electrode ripple noise (RN2) generated at the common electrode (CE) by the second touch driving signal (TDS2) and the common electrode ripple noise (RN4) generated at the common electrode (CE) by the fourth touch driving signal (TDS4) may have different polarities.

[0208] Therefore, at the common electrode (CE), common electrode ripple noises of opposite polarities are canceled out, and the base voltage (EVSS) at the common electrode (CE) takes the form of a DC voltage with no fluctuation in voltage level.

[0209] FIGS. 12 and FIGS. 13 are drawings for explaining a driving area division method for removing common electrode ripple noise in a touch display device (100) according to embodiments of the present disclosure.

[0210] In a touch display device (100) according to embodiments of the present disclosure, when a data driving circuit (120) outputs data signals (Vdata) for image display to a plurality of data lines (DL), a touch driving circuit (160) can output a first touch driving signal (TDS1) and a second touch driving signal (TDS2) to adjacent first touch electrode (TE1) and second touch electrode (TE2), respectively.

[0211] That is, the touch display device (100) according to the embodiments of the present disclosure can perform touch driving while performing display driving. In other words, the touch display device (100) according to the embodiments of the present disclosure can sense touch while performing display driving for image display.

[0212] Meanwhile, the touch display device (100) according to the embodiments of the present disclosure can provide a driving area division method that allows the generated common electrode ripple noise not to have a significant effect on the display driving even if common electrode ripple noise occurs at any point of the common electrode (CE).

[0213] Referring to FIG. 12, when the touch driving circuit (160) supplies a first touch driving signal (TDS1) and a second touch driving signal (TDS2) to the first touch electrode (TE1) and the second touch electrode (TE2), respectively, the touch driving circuit (160) does not supply a touch driving signal (TDS) to the touch electrodes (TE) included in another touch electrode row (TER3) that is spaced apart in the column direction from the first touch electrode row (TER1) which includes the first touch electrode (TE1) and the second touch electrode (TE2). At this time, for display driving, the gate driving circuit (130) can output a gate signal of a turn-on voltage level to one or more gate lines (GL) that overlap with the other touch electrode row (TER3).

[0214] With reference to FIG. 12, the description will be explained in more detail. For convenience of explanation, it is assumed that there are four rows of touch electrodes (TER1, TER2, TER3, TER4) on the display panel (110). At least one data driver (DDRV) and at least one touch driver (TDRV) may be integrated to be implemented as a single integrated integrated circuit (200).

[0215] At the first time (t1), the area where the third touch electrode row (TER3) is placed is the touch driving area (TDA), and the area where subpixels (SP) overlapping with the first touch electrode row (TER1) are placed is the display driving area (DDA).

[0216] At the second time (t2), the area where the fourth touch electrode row (TER4) is placed is the touch driving area (TDA), and the area where subpixels (SP) overlapping with the second touch electrode row (TER2) ​​are placed is the display driving area (DDA).

[0217] At the third time (t3), the area where the first touch electrode row (TER1) is placed is the touch driving area (TDA), and the area where subpixels (SP) overlapping with the third touch electrode row (TER3) are placed is the display driving area (DDA).

[0218] Referring to FIG. 13, when common electrode ripple noise is generated in the common electrode (CE) due to voltage level fluctuations of the touch driving signal (TDS) in the touch driving area (TDA), the common electrode ripple noise travels along the base wire (EVSL).

[0219] Since the base wire (EVSL) has a predetermined resistance (R), when common electrode ripple noise is transmitted through the base wire (EVSL) to the display driving area (DDA) located away from the touch driving area (TDA), the common electrode ripple noise can be significantly attenuated. Accordingly, the common electrode ripple noise with significantly attenuated signal strength does not have a significant impact on display driving in the display driving area (DDA).

[0220] FIGS. 14 and FIGS. 15 are drawings for explaining a driving method for removing common electrode ripple noise in a touch display device (100) according to embodiments of the present disclosure.

[0221] Referring to FIG. 14, in a touch display device (100) according to embodiments of the present disclosure, the frequency (FREQ_TDS) of the touch driving signal (TDS) may be an integer multiple of the display frame frequency (FREQ_FRAME).

[0222] The display frame frequency (FREQ_FRAME) may be the inverse of the period during which a scan signal (SCAN) is applied to the same scan signal line (SCL). The frequency (FREQ_TDS) of the touch driving signal (TDS) may be the inverse of the pulse period of the touch driving signal (TDS).

[0223] Common electrode ripple noise may include a peak voltage in which the voltage of the common electrode (CE) increases in the positive direction when the voltage level of the touch driving signal (TDS) rises from a low level voltage to a high level voltage, and a peak voltage in which the voltage of the common electrode (CE) increases in the negative direction when the voltage level of the touch driving signal (TDS) falls from a high level voltage to a low level voltage.

[0224] A first touch driving signal (TDS1) and a second touch driving signal (TDS2), which are respectively applied to adjacent first touch electrodes (TE1) and second touch electrodes (TE2) in the row direction and have opposite polarities to each other, may have the same frequency (FREQ_TDS).

[0225] For example, when the display frame frequency (FREQ_FRAME) is 100Hz, the frequency (FREQ_TDS) of the touch driving signal (TDS) can be 100KHz, which is an integer multiple of 100Hz.

[0226] As described above, by setting the frequency (FREQ_TDS) of the touch driving signal (TDS) to be an integer multiple of the display frame frequency (FREQ_FRAME), the impact on the display frame by common electrode ripple noise can be minimized.

[0227] Figure 15 is a graph of simulation results to determine the relationship between the frequency of the touch driving signal (TDS) (FREQ_TDS) and the display frame frequency (FREQ_FRAME). In the simulation result graph, the X-axis represents the number of display frames, and the Y-axis represents the RMS (Root Mean Square) current value flowing through the light-emitting element (ED).

[0228] Referring to Fig. 15, in all three simulations (Simulation 1, Simulation 2, Simulation 3), the frequency (FREQ_TDS) of the touch driving signal (TDS) was set to 100KHz.

[0229] Simulation 1 investigated the current flowing to the light-emitting element (ED) under conditions where the frequency of the touch driving signal (TDS) (FREQ_TDS) is set to 100KHz, the display frame frequency (FREQ_FRAME) is set to 120Hz, and 423mV of common electrode ripple noise is randomly generated.

[0230] Simulation 2 investigated the current flowing to the light-emitting element (ED) under conditions where the frequency of the touch driving signal (TDS) (FREQ_TDS) is set to 100KHz, the display frame frequency (FREQ_FRAME) is set to 120Hz, and 160mV of common electrode ripple noise is randomly generated.

[0231] Simulation 3 investigated the current flowing to the light-emitting element (ED) under conditions where the frequency of the touch driving signal (TDS) (FREQ_TDS) is set to 100KHz, the display frame frequency (FREQ_FRAME) is set to 100Hz, and 160mV of common electrode ripple noise is randomly generated.

[0232] Simulation 3 is the case where the frequency of the touch driving signal (TDS) (FREQ_TDS) is an integer multiple of the display frame frequency (FREQ_FRAME). That is, in Simulation 3, the frequency of the touch driving signal (TDS) (FREQ_TDS), which is 100KHz, is 1000 times the display frame frequency (FREQ_FRAME), which is 100Hz.

[0233] Accordingly, each display frame receives the same common electrode ripple noise, so there is almost no variation in the influence of the common electrode ripple noise. Therefore, looking at the results of Simulation 3, it can be confirmed that the common electrode ripple noise has almost no effect on the display driving, and the variation in the current flowing to the light-emitting element (ED) is very small.

[0234] In simulations 1 and 2, the frequency (FREQ_TDS) of the touch driving signal (TDS) cannot be an integer multiple of the display frame frequency (FREQ_FRAME).

[0235] Accordingly, each display frame is subjected to different degrees of common electrode ripple noise, and thus the deviation in the influence of common electrode ripple noise may vary. Therefore, looking at the results of simulations 1 and 2, it can be seen that the common electrode ripple noise does not significantly affect the display driving, resulting in a large deviation in the current flowing to the light-emitting element (ED). Among simulations 1 and 2, it can be seen that the deviation in the current flowing to the light-emitting element (ED) is relatively larger in simulation 1, where the voltage of the common electrode ripple noise is higher.

[0236] FIG. 16 is a cross-sectional view of a display panel (110) for reducing the effect of common electrode ripple noise on a subpixel (SP) in a touch display device (100) according to embodiments of the present disclosure. FIG. 17 is an equivalent circuit showing that, according to the cross-sectional view of FIG. 16, the phenomenon of common electrode ripple noise being coupled to a data signal (Vdata) is prevented.

[0237] Comparing the cross-sectional structure of Fig. 16 with that of Fig. 6, the cross-sectional structure of Fig. 16 is almost identical to that of Fig. 6, except for changes in the structure (location, etc.) of the base wiring (EVSL) and shield layer (SHD). Therefore, the following explanation will focus on the differences from the cross-sectional structure of Fig. 6.

[0238] Referring to FIG. 16, in the display panel (110) of the touch display device (100) according to embodiments of the present disclosure, a plurality of base wires (EVSL) are arranged in the lowest layer.

[0239] Referring to FIG. 16, a plurality of insulating layers (BUF1, BUF2, ILD1, PAS) may exist between a plurality of base wires (EVSL) and a common electrode (CE). A portion of the common electrode (CE) may be connected to a portion of the base wires (EVSL) exposed through contact holes (CNT) of the plurality of insulating layers (BUF1, BUF2, ILD1, PAS).

[0240] Referring to FIG. 16, the display panel (110) of the touch display device (100) according to embodiments of the present disclosure may include a shield layer (SHD) located between the base wiring (EVSL) and the common electrode (CE).

[0241] Referring to FIG. 16, the shield layer (SHD) may be located above the base wire (EVSL) and below the switching transistor (SWT) or data line (DL).

[0242] Referring to FIG. 16, the shield layer (SHD) overlaps with at least a portion of the base wiring (EVSL) and may overlap with at least a portion of one electrode (drain electrode (D2)) of the switching transistor (SWT) or at least a portion of the data line (DL) electrically connected to one electrode (drain electrode (D2)) of the switching transistor (SWT).

[0243] Referring to FIG. 16, the shield layer (SHD) can block the capacitive coupling between the data line (DL) and the base wire (EVSL). The shield layer (SHD) can block the capacitive coupling between one electrode (drain electrode (D2)) of the switching transistor (SWT) and the base wire (EVSL).

[0244] Accordingly, with reference to FIGS. 16 and 17, even if common electrode ripple noise generated at the common electrode (CE) is transmitted to the base wire (EVSL), it can be prevented from being transmitted from the base wire (EVSL) to the data line (DL) or one electrode (drain electrode (D2)) of the switching transistor (SWT).

[0245] Referring to FIGS. 16 and 17, the formation of coupling capacitance (Cc) between the base wire (EVSL) and the data line (DL) can be prevented. The formation of coupling capacitance (Cc) between the base wire (EVSL) and one electrode (drain electrode (D2)) of the switching transistor (SWT) can be prevented.

[0246] Referring to FIG. 16, the shield layer (SHD) may be one of the first plate (PLT1) and the second plate (PLT2) that constitute the storage capacitor (Cst) (PLT2).

[0247] The cross-sectional structure of Fig. 16 will be briefly explained again.

[0248] Referring to FIG. 16, a touch display device (100) according to embodiments of the present disclosure may include a plurality of data lines (DL), a plurality of subpixels (SP), an encapsulation layer (ENCAP), etc.

[0249] Each of the plurality of subpixels (SP) may include a light-emitting element (ED) comprising a pixel electrode (PE), a light-emitting layer (EL), and a common electrode (CE), a driving transistor (DT) for driving the light-emitting element (ED), a switching transistor (SWT) for controlling the connection between the gate electrode (G1) of the driving transistor (DT) and a data line (DL), and a storage capacitor (Cst) connected between the gate electrode (G1) of the driving transistor (DT) and the pixel electrode (PE).

[0250] Referring to FIG. 16, the encapsulation layer (ENCAP) can be placed on the common electrode (CE). A plurality of touch electrodes (TE) corresponding to the touch sensor can be placed on the encapsulation layer (ENCAP).

[0251] Referring to FIG. 16, a plurality of base wires (EVSL) are located below the common electrode (CE) and can be electrically connected to the common electrode (CE).

[0252] Referring to FIG. 16, a plurality of shield layers (SHD) may be located above a plurality of base wires (EVSL) and below a switching transistor (SWT) or data line (DL).

[0253] Referring to FIG. 16, each of the plurality of shield layers (SHD) may overlap with at least a portion of the base wiring (EVSL) and may overlap with at least a portion of one electrode (D2) of the switching transistor (SWT) or at least a portion of the data line (DL) electrically connected to one electrode (D2) of the switching transistor (SWT).

[0254] At least a portion of one electrode (D2) of the switching transistor (SWT) or a data line (DL) electrically connected to one electrode of the switching transistor (SWT) may not overlap with the base wiring (EVSL).

[0255] Accordingly, each of the multiple shield layers (SHD) can block a data line (DL) electrically connected to one electrode of the switching transistor (SWT) or one electrode of the switching transistor (SWT) from being capacitively coupled with the base wire (EVSL). Accordingly, the data line (DL) electrically connected to one electrode of the switching transistor (SWT) or one electrode of the switching transistor (SWT) does not form a coupling capacitor (Cc) with the base wire (EVSL).

[0256] Multiple base lines (EVSL) can be spaced apart from multiple data lines (DL).

[0257] Referring to FIG. 16, the display panel (110) may further include a plurality of insulating layers (PAS, ILD1, BUF1, BUF2) having a plurality of contact holes (CNT) and disposed on the base wiring (EVSL).

[0258] Here, a plurality of insulating layers (PAS, ILD1, BUF1, BUF2) may include a first buffer layer (BUF1) on a substrate (SUB), a second buffer layer (BUF2) on the first buffer layer (BUF1), a first interlayer insulating film (ILD1) on the second buffer layer (BUF2), and a passivation layer (PAS) on the first interlayer insulating film (ILD1).

[0259] The shield layer (SHD) is located on the first buffer layer (BUF1) and can be located below the second buffer layer (BUF2).

[0260] The common electrode (CE) can be electrically contacted with a portion of the base wiring (EVSL) exposed through the contact holes (CNT) of the plurality of insulating layers (PAS, ILD1, BUF1, BUF2).

[0261] Referring to FIG. 16, each of the multiple shield layers (SHD) may be one of the first plate (PLT1) and the second plate (PLT2) that constitute the storage capacitor (Cst).

[0262] Referring to FIG. 16, a plurality of touch electrodes (TE) may include a first touch electrode (TE1) and a second touch electrode (TE2) adjacent in the row direction. When a first touch driving signal (TDS1) with a fluctuating voltage level is applied to the first touch electrode (TE1), a second touch driving signal (TDS2) with the same frequency as the first touch driving signal (TDS1), a fluctuating voltage level, and a polarity inverted compared to the first touch driving signal (TDS1) may be applied to the second touch electrode (TE2).

[0263] FIGS. 18 and 19 are examples of the arrangement of base wiring (EVSL) in a display panel (110) of a touch display device (100) according to embodiments of the present disclosure.

[0264] FIG. 18 is an exemplary arrangement of subpixels (R, W, B, G) and signal lines (DVL, RVL, DL1~DL8, EVSL) when the touch display device (100) according to embodiments of the present disclosure is an opaque display.

[0265] FIG. 19 is an exemplary arrangement of light-emitting regions (EA1~EA4) and signal lines (DVL, RVL, EVSL) of subpixels (R, W, B, G) when the touch display device (100) according to embodiments of the present disclosure is an opaque display. However, data lines (DL) are omitted in FIG. 19.

[0266] Referring to FIG. 18, the reference voltage line (RVL) can be arranged in a structure shared by four subpixels (R, W, B, G). The driving voltage line (DVL) can be arranged in a structure shared by four subpixels (R, W, B, G). Each of the data lines (DL1 to DL8) can be arranged to correspond to one subpixel.

[0267] Each of the plurality of base lines (EVSL) may be placed for at least one subpixel column. For example, each of the plurality of base lines (EVSL) may be placed for one subpixel column, for two or more subpixel columns, or for one pixel column or two or more subpixel columns. Here, one pixel column may include four color subpixels (R, W, B, G).

[0268] In the example of FIG. 18, one base wire (EVSL) can be placed for every four subpixels (R, W, B, G). That is, when four subpixels (R, W, B, G) are considered as one pixel, one base wire (EVSL) can be placed for every pixel.

[0269] Referring to FIG. 19, the display panel (110) includes a display area (DA), and the display area (DA) may include light-emitting areas (EA1~EA4) of a plurality of subpixels (SP) and a plurality of transmission areas (TA1, TA2, TA3).

[0270] Referring to FIG. 19, each of the plurality of transmission regions (TA1, TA2, TA3) can be positioned between the light-emitting regions (EA1~EA4) of two or more subpixel columns (SPC1, SPC2) and the light-emitting regions (EA1~EA4) of two or more subpixel columns (SPC1, SPC2) adjacent to them.

[0271] Referring to FIG. 19, a base wire (EVSL) may be placed between an adjacent first transparent area (TA1) and a second transparent area (TA2) among a plurality of transparent areas (TA1, TA2, TA3). A base wire (EVSL) may be placed between an adjacent second transparent area (TA2) and a third transparent area (TA3) among a plurality of transparent areas (TA1, TA2, TA3).

[0272] In the example of FIG. 19, each of the multiple base wires (EVSL) can be placed every two subpixel columns.

[0273] According to the embodiments of the present disclosure described above, a self-emissive display type touch display device having a built-in touch sensor capable of providing excellent image quality and precise touch sensitivity, and a driving circuit included therein can be provided.

[0274] According to embodiments of the present disclosure, a self-emissive display type touch display device having a built-in touch sensor that can eliminate or minimize the effect of touch driving on display driving, and a driving circuit included therein can be provided.

[0275] According to embodiments of the present disclosure, a touch display device and a driving circuit can be provided that prevent ripple noise from occurring at the common electrode of the light-emitting elements even if the voltage level of the touch driving signal for driving the touch sensor fluctuates, when the common electrode required for configuring light-emitting elements for self-luminescence is included and a touch sensor is embedded on the common electrode.

[0276] According to the embodiments of the present disclosure, even if ripple noise is generated at the common electrode of light-emitting elements due to voltage level fluctuations of a touch driving signal for driving a touch sensor, a touch display device and a driving circuit can be provided that can eliminate or minimize the effect of ripple noise on display driving.

[0277] The foregoing description is merely an illustrative explanation of the technical concept of the present disclosure, and those skilled in the art to which the present disclosure pertains may make various modifications and variations within the scope of the essential characteristics of the present disclosure. Furthermore, the embodiments disclosed in the present disclosure are intended to explain, not limit, the technical concept of the present disclosure, and thus the scope of the technical concept of the present disclosure is not limited by these embodiments. The scope of protection of the present disclosure shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present disclosure.

Claims

Claim 1 A display panel comprising a plurality of data lines, a plurality of gate lines and a plurality of subpixels, a plurality of light-emitting elements corresponding to each of the plurality of subpixels, an encapsulation layer disposed on the plurality of light-emitting elements, and a plurality of touch electrodes disposed on the encapsulation layer; The device includes a touch driving circuit that, when supplying a first touch driving signal with a fluctuating voltage level to a first touch electrode among the plurality of touch electrodes, supplies a second touch driving signal having the same frequency as the first touch driving signal, fluctuating voltage level, and having a polarity inverted compared to the first touch driving signal to a second touch electrode adjacent to the first touch electrode in a row direction among the plurality of touch electrodes, wherein during the period in which touch driving is performed, both the signal detected from the first touch electrode receiving the first touch driving signal and the signal detected from the second touch electrode receiving the second touch driving signal are used to generate touch sensing data, and at the same time, the first touch electrode is driven by the first touch driving signal and the second touch electrode is driven by the second touch driving signal, and each of the plurality of subpixels comprises a light-emitting element including a pixel electrode, a light-emitting layer on the pixel electrode, and a common electrode on the light-emitting layer, a driving transistor for driving the light-emitting element, a switching transistor that switches whether there is an electrical connection between the gate electrode of the driving transistor and the data line, and the gate electrode of the driving transistor and the driving transistor It includes a storage capacitor electrically connected between a source electrode or a drain electrode, wherein the pixel electrode is disposed for each of the plurality of subpixels and is electrically connected to the source electrode or the drain electrode of the driving transistor, the common electrode is disposed in common for the plurality of subpixels and a base voltage with no fluctuation in voltage level is applied, and each of the plurality of touch electrodes corresponds in size to two or more subpixels,A touch display device, wherein the above display panel further comprises a plurality of base wires electrically connected to the common electrode, wherein the plurality of base wires are spaced apart from the plurality of data lines and the plurality of base wires are located below the common electrode, and the above display panel further comprises at least one insulating layer disposed on the plurality of base wires, wherein the at least one insulating layer comprises a contact hole, wherein the common electrode is cut off at the vicinity of the contact hole between a part of the common electrode and another part of the common electrode, wherein the contact hole comprises a first contact hole and a second contact hole, wherein a part of the plurality of base wires and a part of the common electrode are electrically connected through the first contact hole, and another part of the plurality of base wires and another part of the common electrode are electrically connected through the second contact hole. Claim 2 A touch display device according to claim 1, wherein the plurality of touch electrodes further include a third touch electrode adjacent to the first touch electrode in a column direction and a fourth touch electrode adjacent to the second touch electrode in a column direction, wherein the third touch electrode and the fourth touch electrode are adjacent in a row direction, and the touch driving circuit supplies the first touch driving signal to the first touch electrode and supplies the second touch driving signal having a polarity inverted compared to the first touch driving signal to the second touch electrode, supplies the third touch driving signal having the same frequency as the first touch driving signal and the same polarity as the first touch driving signal to the third touch electrode, and supplies the fourth touch driving signal having the same frequency as the second touch driving signal and the same polarity as the second touch driving signal to the fourth touch electrode. Claim 3 A touch display device according to claim 1, wherein the plurality of touch electrodes further include a third touch electrode adjacent to the first touch electrode in a column direction and a fourth touch electrode adjacent to the second touch electrode in a column direction, and the third touch electrode and the fourth touch electrode are adjacent in a row direction, and the touch driving circuit supplies the first touch driving signal to the first touch electrode and supplies the second touch driving signal having a polarity inverted compared to the first touch driving signal to the second touch electrode, supplies the third touch driving signal having the same frequency as the second touch driving signal and the same polarity as the second touch driving signal to the third touch electrode, and supplies the fourth touch driving signal having the same frequency as the first touch driving signal and the same polarity as the first touch driving signal to the fourth touch electrode. Claim 4 A touch display device according to claim 1, further comprising a data driving circuit for driving a plurality of data lines and a gate driving circuit for driving a plurality of gate lines, wherein when the data driving circuit outputs data signals for image display to the plurality of data lines, the touch driving circuit outputs the first touch driving signal and the second touch driving signal. Claim 5 A touch display device according to claim 4, wherein when the touch driving circuit supplies the first touch driving signal and the second touch driving signal to each of the first touch electrode and the second touch electrode, the touch driving circuit does not supply the touch driving signal to the touch electrodes included in the second touch electrode row spaced apart in the column direction from the first touch electrode row including the first touch electrode and the second touch electrode, and the gate driving circuit outputs a gate signal of a turn-on voltage level to one or more gate lines superimposed on the second touch electrode row. Claim 6 delete Claim 7 A touch display device according to claim 1, wherein each of the plurality of base wires is arranged for at least one subpixel column. Claim 8 A touch display device according to claim 1, wherein the display panel includes a display area, the display area includes a plurality of light-emitting areas of subpixels and a plurality of transmission areas, each of the plurality of transmission areas is disposed between light-emitting areas of two or more subpixel columns and light-emitting areas of two or more subpixel columns, and the base wiring is disposed between an adjacent first transmission area and a second transmission area among the plurality of transmission areas. Claim 9 A touch display device according to claim 1, wherein at least one of the plurality of base wires has a potential difference with an adjacent data line or has a potential difference with an electrode connected to an adjacent data line among the source electrode and drain electrode of an adjacent switching transistor. Claim 10 delete Claim 11 A touch display device according to claim 1, wherein each of the plurality of base wires is located on the same layer as at least one of the source electrode, drain electrode, and gate electrode of the switching transistor included in an adjacent subpixel. Claim 12 A touch display device according to claim 1, wherein the display panel further comprises a shield layer positioned above the base wiring, positioned below the switching transistor or the data line, overlapping with at least a portion of the base wiring, and overlapping with at least a portion of one electrode of the switching transistor or at least a portion of the data line electrically connected to one electrode of the switching transistor. Claim 13 In paragraph 12, the shield layer is a touch display device that is one of the first plate and the second plate constituting the storage capacitor. Claim 14 A touch display device according to claim 1, wherein the frequencies of the first touch driving signal and the second touch driving signal are integer multiples of the display frame frequency. Claim 15 delete Claim 16 delete Claim 17 A touch display device comprises: a plurality of data lines; a plurality of subpixels including a light-emitting element comprising a pixel electrode, a light-emitting layer, and a common electrode, a driving transistor for driving the light-emitting element, a switching transistor for controlling the connection between the gate electrode of the driving transistor and the data lines, and a storage capacitor connected between the gate electrode of the driving transistor and the pixel electrode; an encapsulation layer disposed on the common electrode; a plurality of touch electrodes disposed on the encapsulation layer; a plurality of base wires located below the common electrode and electrically connected to the common electrode; a plurality of shield layers located above the plurality of base wires, located below the switching transistor or the data lines, overlapping with at least a portion of the base wires, and overlapping with at least a portion of one electrode of the switching transistor or at least a portion of the data lines electrically connected to one electrode of the switching transistor.The device includes a touch driving circuit that, when supplying a first touch driving signal with a fluctuating voltage level to a first touch electrode among the plurality of touch electrodes, supplies a second touch driving signal having the same frequency as the first touch driving signal, fluctuating voltage level, and having a polarity inverted compared to the first touch driving signal to a second touch electrode adjacent to the first touch electrode in a row direction among the plurality of touch electrodes, wherein during the period in which touch driving is performed, both the signal detected from the first touch electrode receiving the first touch driving signal and the signal detected from the second touch electrode receiving the second touch driving signal are used to generate touch sensing data, and at the same time, the first touch electrode is driven by the first touch driving signal and the second touch electrode is driven by the second touch driving signal, and further includes a plurality of insulating layers disposed on the plurality of base wires and having contact holes, wherein the common electrode is cut off at the vicinity of the contact hole into a part of the common electrode and another part of the common electrode, and the contact hole includes a first contact hole and a second contact hole, and the first contact hole A touch display device in which a portion of the plurality of base wires and a portion of the common electrode are electrically connected through the second contact hole, and another portion of the plurality of base wires and another portion of the common electrode are electrically connected through the second contact hole. Claim 18 In claim 17, the touch display device wherein the plurality of base wires are spaced apart from the plurality of data lines. Claim 19 delete Claim 20 In claim 17, a touch display device in which one electrode of the switching transistor or a data line electrically connected to one electrode of the switching transistor does not overlap with the base wiring. Claim 21 In claim 17, each of the plurality of shield layers is a touch display device that is one of the first plate and the second plate constituting the storage capacitor. Claim 22 A touch display device according to claim 17, wherein the plurality of touch electrodes includes a first touch electrode and a second touch electrode adjacent in a row direction, and when a first touch driving signal having a voltage level that varies is applied to the first touch electrode, a second touch driving signal having the same frequency as the first touch driving signal, a voltage level that varies, and a polarity that is inverted compared to the first touch driving signal is applied to the second touch electrode.

Images