KR20240022352A - Touch display device and driving circuit - Google Patents

Abstract

Embodiments of the present disclosure relate to a touch display device and a driving circuit, and more specifically, to a display panel including a plurality of light-emitting elements and a plurality of touch electrodes; a touch circuit that detects a touch by applying a touch driving signal to the plurality of touch electrodes and receiving a touch sensing signal according to a change in capacitance; a timing controller that controls the touch circuit; And a common voltage compensation circuit that generates a compensation touch reference voltage or compensation common voltage reflecting the cathode noise introduced into the cathode electrode, using the feedback common voltage transmitted from the feedback line connected to the cathode electrode of the light emitting device, The touch circuit may provide a touch display device that generates a touch output signal with reduced noise using the compensated touch reference voltage.

Description

Touch display device and driving circuit {TOUCH DISPLAY DEVICE AND DRIVING CIRCUIT}

Embodiments of the present disclosure relate to a touch display device and a driving circuit, and more specifically, to a touch display device and a driving circuit that can improve touch performance and reduce noise.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Various display devices are used, such as liquid crystal displays, electroluminescent displays, or quantum dot light emitting displays.

In order to provide more diverse functions, these display devices provide a function to recognize the user's finger or pen touch on the display panel and perform input processing based on the recognized touch.

As an example, a touch display device capable of touch recognition includes a plurality of touch electrodes disposed or embedded in a display panel, and drives these touch electrodes to detect the presence of a user's touch on the display panel and touch coordinates. .

The range of use of these touch display devices is expanding not only to mobile devices such as smartphones and tablet PCs, but also to large-screen touch display devices such as automotive displays and exhibition displays.

As the screen of the touch display device increases, signal delay occurs in the process of transmitting the touch signal, and noise may occur due to electromagnetic interference between the touch signal and the display signal during the touch driving or display driving process.

Such signal delay and noise can not only reduce the quality of images displayed on the display panel but also deteriorate touch performance, so a method that can eliminate touch signal delay and reduce noise is required.

Accordingly, the inventors of the present disclosure have invented a touch display device and driving circuit that can improve touch performance and reduce noise.

Embodiments of the present disclosure can provide a touch display device and driving circuit that can improve image quality and touch performance by reducing the influence of noise excited through a cathode electrode of a light emitting device.

In addition, embodiments of the present disclosure provide a touch display device and drive capable of improving image quality and touch performance by reflecting noise excited through the cathode electrode of the light emitting device and supplying a compensation signal in the display driving period and the touch driving period. Circuit can be provided.

In addition, embodiments of the present disclosure can provide a touch display device and driving circuit that can effectively improve image quality and touch performance by controlling the compensation signal according to the frequency of noise excited through the cathode electrode of the light emitting device. .

Additionally, embodiments of the present disclosure can provide a touch display device and a driving circuit that can effectively improve image quality and touch performance by controlling the position where the compensation signal is supplied according to the position of the cathode signal that is fed back.

Embodiments of the present disclosure include a display panel including a plurality of light-emitting elements and a plurality of touch electrodes, and a touch panel that detects a touch by applying a touch driving signal to the plurality of touch electrodes and receiving a touch sensing signal according to a change in capacitance. A circuit, a timing controller for controlling the touch circuit, and a feedback common voltage transmitted from a feedback line connected to the cathode electrode of the light emitting device to generate a compensation touch reference voltage reflecting the cathode noise introduced into the cathode electrode. A touch display device including a common voltage compensation circuit, wherein the touch circuit generates a touch output signal with reduced noise using the compensation touch reference voltage, can be provided.

Embodiments of the present disclosure use a feedback common voltage transmitted from a feedback line connected to the cathode electrode of a light emitting device disposed on a display panel to generate a compensation touch reference voltage or compensation common voltage that reflects the cathode noise introduced into the cathode electrode. A touch driving signal is applied to a common voltage compensation circuit and a plurality of touch electrodes disposed on the display panel, and a touch sensing signal is received according to capacitance change, and noise is reduced using the compensation touch reference voltage. A driving circuit including a touch circuit that generates an output signal can be provided.

According to embodiments of the present disclosure, it is possible to provide a touch display device and a driving circuit that can improve touch performance and reduce noise.

In addition, according to embodiments of the present disclosure, there is an effect of providing a touch display device and a driving circuit that can improve image quality and touch performance by reducing the influence of noise excited through the cathode electrode of the light emitting device. there is.

In addition, according to embodiments of the present disclosure, a touch display capable of improving image quality and touch performance by reflecting noise excited through the cathode electrode of the light emitting device and supplying a compensation signal in the display driving period and the touch driving period. It has the effect of providing a device and a driving circuit.

In addition, according to embodiments of the present disclosure, a touch display device and a driving circuit are provided that can effectively improve image quality and touch performance by controlling the compensation signal according to the frequency of noise excited through the cathode electrode of the light emitting device. There is an effect that can be done.

In addition, according to embodiments of the present disclosure, a touch display device and a driving circuit can be provided that can effectively improve image quality and touch performance by controlling the position where the compensation signal is supplied according to the position of the cathode signal that is fed back. There is a possible effect.

1 is a diagram schematically showing a touch display device according to embodiments of the present disclosure.
Figure 2 is a diagram showing an example of a touch sensing system of a touch display device according to embodiments of the present disclosure.
FIG. 3 is a diagram illustrating a structure in which a touch panel is embedded in a display panel in a touch display device according to embodiments of the present disclosure.
FIG. 4 is a diagram briefly illustrating a touch electrode structure for mutual capacitance-based touch sensing in a touch display device according to embodiments of the present disclosure.
FIG. 5 is a diagram illustrating an equivalent circuit of subpixels constituting a display panel in a touch display device according to embodiments of the present disclosure.
FIG. 6 is a diagram showing an example of a cross-section of a display panel in a touch display device according to embodiments of the present disclosure.
FIG. 7 is a diagram showing an example of a signal applied to a touch electrode for time division driving in a touch display device according to embodiments of the present disclosure.
FIG. 8 is a diagram showing an example of a touch circuit of a touch display device according to embodiments of the present disclosure.
FIGS. 9 and 10 are diagrams for explaining cathode noise induced to a cathode electrode during a touch driving process and a decrease in touch sensitivity due to cathode noise in the display panel of a touch display device according to embodiments of the present disclosure.
FIG. 11 is a block diagram illustrating the concept of generating a common voltage compensation signal through a common voltage feedback line in a touch display device according to embodiments of the present disclosure.
FIG. 12 is a block diagram conceptually showing the configuration of a common voltage compensation circuit in a touch display device according to embodiments of the present disclosure.
FIG. 13 is a diagram illustrating in detail a switching circuit constituting a common voltage compensation circuit in a touch display device according to embodiments of the present disclosure.
FIG. 14 is a signal flow diagram illustrating the operation of a switching circuit constituting a common voltage compensation circuit in a touch display device according to embodiments of the present disclosure.
FIG. 15 is a diagram illustrating in detail a compensation voltage generation circuit constituting a common voltage compensation circuit in a touch display device according to embodiments of the present disclosure.
FIG. 16 is a diagram illustrating an operation of improving noise of a touch output signal through a compensation touch reference voltage in a touch display device according to embodiments of the present disclosure.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. In adding reference numerals to components in each drawing, the same components may have the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted. When “comprises,” “has,” “consists of,” etc. mentioned in the specification are used, other parts may be added unless “only” is used. When a component is expressed in the singular, it can also include the plural, unless specifically stated otherwise.

Additionally, when describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the components are not limited by the term.

In the description of the positional relationship of components, when two or more components are described as being “connected,” “coupled,” or “connected,” the two or more components are directly “connected,” “coupled,” or “connected.” ", but it should be understood that two or more components and other components may be further "interposed" and "connected," "combined," or "connected." Here, other components may be included in one or more of two or more components that are “connected,” “coupled,” or “connected” to each other.

In the description of temporal flow relationships related to components, operation methods, production methods, etc., for example, temporal precedence relationships such as “after”, “after”, “after”, “before”, etc. Or, when a sequential relationship is described, non-continuous cases may be included unless “immediately” or “directly” is used.

On the other hand, when a numerical value or corresponding information (e.g., level, etc.) for a component is mentioned, even if there is no separate explicit description, the numerical value or corresponding information is related to various factors (e.g., process factors, internal or external shocks, It can be interpreted as including the error range that may occur due to noise, etc.).

Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the attached drawings.

1 is a diagram illustrating a schematic configuration of a touch display device according to embodiments of the present disclosure.

Referring to FIG. 1, the touch display device 100 according to embodiments of the present disclosure includes components for displaying images, including a display panel 110, a gate driving circuit 120, a data driving circuit 130, and It may include a timing controller 140, etc.

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 area outside 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 may be an area that is bent and not visible from the front of the touch display device 100.

The display panel 110 may include multiple subpixels (SP). For example, the touch display device 100 may be various types of display devices including a liquid crystal display device, an organic light emitting display device, a micro light emitting diode (micro LED) display device, a quantum dot display device, etc.

The structure of each subpixel (SP) may vary depending on the type of the touch display device 100. For example, if the touch display device 100 is a self-luminous display device in which subpixels (SPs) emit light on their own, each subpixel (SP) includes a light-emitting element that emits light on its own, one or more transistors, and one or more capacitors. can do.

Additionally, the display panel 110 may further include various types of signal lines to drive multiple subpixels (SP). For example, different types of signal lines include multiple data lines (DL) carrying data signals (also called data voltages or image data) and multiple gate lines (GL) carrying gate signals (also called scan signals). ), etc. may be included.

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

Here, Column Direction and Row Direction are relative. For example, the column direction may be vertical and the row direction may be horizontal. For another example, the column direction may be horizontal and the row direction may be vertical.

The data driving circuit 130 is a circuit for driving a plurality of data lines DL and can output data signals to the plurality of data lines DL. The gate driving circuit 120 is a circuit for driving a plurality of gate lines GL and can output a gate signal to the plurality of gate lines GL.

The timing controller 140 is a device for controlling the data driving circuit 130 and the gate driving circuit 120, and controls the driving timing for the plurality of data lines DL and the driving timing for the plurality of gate lines GL. You can control it.

The timing controller 140 supplies various types of data driving control signals (DCS) to the data driving circuit 130 to control the data driving circuit 130, and various types of data driving control signals (DCS) to control the gate driving circuit 120. A variety of gate driving control signals (GCS) can be supplied to the gate driving circuit 120.

The gate driving circuit 120 may supply gate signals to a plurality of gate lines GL according to timing control of the timing controller 140. The gate driving circuit 120 receives a first gate voltage corresponding to the turn-on level voltage and a second gate voltage corresponding to the turn-off level voltage along with various gate driving control signals (GCS), and generates a gate signal. and the generated gate signal can be supplied 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.

The data driving circuit 130 may supply data signals to a plurality of data lines DL according to the driving timing control of the timing controller 140. The data driving circuit 130 receives image data (DATA) in digital form from the timing controller 140, converts the received image data (DATA) into analog data signals, and converts them into a plurality of data lines (DL). Can be printed.

In order to provide not only an image display function but also a touch sensing function, the touch display device 100 detects whether a touch has occurred by a touch object such as a finger or a pen by sensing the touch panel or detects the touch location. It may include a touch circuit 150 that does.

The touch circuit 150 includes a touch driving circuit 152 that generates touch sensing data by driving and sensing the touch panel, and a touch controller 154 that can detect the occurrence of a touch or detect the touch position using the touch sensing data. ), etc. may be included.

A touch panel may include a plurality of touch electrodes (TE) as a touch sensor. The touch panel may further include a plurality of touch lines (TL) to electrically connect a plurality of touch electrodes (TE) and the touch driving circuit 152. A touch panel or touch electrode (TE) is also called a touch sensor.

The touch panel may exist outside of the display panel 110 or inside the display panel 110. If the touch panel exists outside the display panel 110, it is called an external touch panel. When the touch panel is an external type, the touch panel and the display panel 110 may be manufactured separately and then combined. An external touch panel may include a substrate and a plurality of touch electrodes (TE) on the substrate.

When the touch panel is present inside the display panel 110, it is called a built-in touch panel. In the case of a built-in touch panel, the touch panel may be formed within the display panel 110 during the manufacturing process of the display panel 110.

The touch driving circuit 152 supplies a touch driving signal to at least one of the plurality of touch electrodes (TE), detects a touch sensing signal transmitted from at least one touch electrode (TE) of the plurality of touch electrodes (TE), and touches the touch electrode (TE). Sensing data can be generated.

The touch circuit 150 may perform touch sensing using a self-capacitance sensing method or a mutual-capacitance sensing method.

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

When the touch circuit 150 performs touch sensing using the mutual-capacitance sensing method, the touch circuit 150 may perform touch sensing based on the capacitance between the touch electrodes TE.

According to the mutual-capacitance sensing method, multiple touch electrodes (TE) are divided into touch driving electrodes and touch sensing electrodes. The touch driving circuit 152 can drive a touch driving electrode using a touch driving signal and detect a touch sensing signal from the touch sensing electrode.

According to the self-capacitance sensing method, each of the plurality of touch electrodes (TE) can serve as a touch driving electrode and a touch sensing electrode. The touch driving circuit 152 may drive all or part of the plurality of touch electrodes TE and sense all or part of the plurality of touch electrodes TE.

The touch driving circuit 152 and the touch controller 154 may be implemented as separate devices or as one device.

Alternatively, the touch driving circuit 152 and the data driving circuit 130 may be implemented as separate integrated circuits. Alternatively, all or part of the touch driving circuit 152 and all or part of the data driving circuit 130 may be integrated into one integrated circuit.

The touch display device 100 according to embodiments of the present disclosure is a self-light emitting device in which a light emitting element capable of self-emitting, such as an organic light emitting display device, a quantum dot display device, a micro LED display device, etc., is disposed on the display panel 110. It may be a display device.

Figure 2 is a diagram showing an example of a touch sensing system of a touch display device according to embodiments of the present disclosure.

Referring to FIG. 2, the touch sensing system of the touch display device 100 according to embodiments of the present disclosure includes a plurality of touch electrodes (TE), a plurality of touch lines (TL), a touch driving circuit 152, and a touch It may include a controller 154, etc.

In the touch display device 100 according to embodiments of the present disclosure, the data driving circuit 130 may include a plurality of data driving integrated circuits (SDICs), and the touch driving circuit 152 may include a plurality of touch driving integrated circuits. (ROIC) may be included.

Each of the multiple data driving integrated circuits (SDICs) may be implemented as a separate integrated circuit. Each of the multiple touch driving integrated circuits (ROICs) may be implemented as a separate integrated circuit.

Alternatively, at least one data driving integrated circuit (SDIC) and at least one touch driving integrated circuit (ROIC) may be integrated and implemented as one integrated integrated circuit 200.

According to this, the touch display device 100 according to embodiments of the present disclosure includes one or more integrated integrated circuits 200, and each integrated circuit 200 includes at least one data driving integrated circuit (SDIC) and at least It may include one touch driving integrated circuit (ROIC).

For example, in the touch display device 100 according to embodiments of the present disclosure, each of the plurality of integrated circuits 200 may be mounted on the circuit film 210. One side of the multiple circuit films 210 on which the multiple integrated circuits 200 are mounted may be electrically connected to the display panel 110 .

The other side of the plurality of circuit films 210 on which the plurality of integrated integrated circuits 200 are mounted may be electrically connected to the printed circuit board 220.

In the touch display device 100 according to embodiments of the present disclosure, each of the plurality of touch electrodes (TE) may be electrically connected to the touch driving integrated circuit (ROIC) through at least one touch line (TL).

The multiple touch electrodes (TE) may all be located on the same layer, and the multiple touch lines (TL) may be located on a different layer from the multiple touch electrodes (TE).

The plurality of touch electrodes TE includes a first touch electrode TE1, a second touch electrode TE2 adjacent to the first touch electrode TE1 in the row direction, and a third touch electrode TE1 adjacent to the first touch electrode TE1 in the column direction. It may include a touch electrode TE3 and a fourth touch electrode TE4 adjacent to the third touch electrode TE3 in the row direction.

The first touch electrode TE1 is electrically connected to the first touch line TL1, the second touch electrode TE2 is electrically connected to the second touch line TL2, and the third touch electrode TE3 is electrically connected to the first touch line TL1. It may be electrically connected to the third touch line TL3, and the fourth touch electrode TE4 may be electrically connected to the fourth touch line TL4.

The first touch line TL1 overlaps the third touch electrode TE3 but is not electrically connected to the third touch electrode TE3. The second touch line TL2 overlaps the fourth touch electrode TE4 but is not electrically connected to the fourth touch electrode TE4.

Each of the plurality of touch electrodes (TE) may overlap one or more subpixels (SP).

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

Since the first touch electrode TE1 and the second touch electrode TE2 are disposed in the same touch electrode row, they may overlap two or more of the same gate lines GL. Since the third touch electrode TE3 and the fourth touch electrode TE4 are disposed in the same touch electrode row, they may overlap two or more of the same gate lines GL.

Since the first touch electrode TE1 and the third touch electrode TE3 are disposed in the same touch electrode row, they may overlap two or more of the same data lines DL. Since the second touch electrode TE2 and the fourth touch electrode TE4 are disposed in the same touch electrode row, they may overlap two or more of the same data lines DL.

Each of the plurality of touch electrodes TE may be a mesh-type electrode having a plurality of openings. Each of the plurality of openings in each touch electrode TE may correspond to a light emitting area of the subpixel SP or may correspond to a transmission area (or transparent area).

FIG. 3 is a diagram illustrating a structure in which a touch panel is embedded in a display panel in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 3, in the touch display device 100 according to embodiments of the present disclosure, a plurality of subpixels SP are arranged on the substrate SUB in the display area AA of the display panel 110. .

Each subpixel (SP) transmits the data voltage (Vdata) to the light-emitting element (ED), a driving transistor (DRT) for driving the light-emitting element (ED), and the first node (N1) of the driving transistor (DRT). It may include a switching transistor (SWT) to maintain a constant voltage for one frame, and a storage capacitor (Cst) to maintain a constant voltage for one frame.

The driving transistor (DRT) has a first node (N1) to which the data voltage (Vdata) can be applied through the switching transistor (SWT), a second node (N2) electrically connected to the light emitting element (ED), and a driving voltage It may include a third node N3 to which the driving voltage EVDD is applied from the line DVL. The first node (N1) is a gate node, the second node (N2) may be a source node or a drain node, and the third node (N3) may be a drain node or a source node.

The light emitting device (ED) may include an anode electrode, a light emitting layer, and a cathode electrode. The anode electrode is electrically connected to the second node (N2) of the driving transistor (DRT), and the base voltage (EVSS) can be applied to the cathode electrode.

In this light-emitting device (ED), the light-emitting layer may be an organic light-emitting layer containing organic materials. In this case, the light emitting device (ED) may be an organic light emitting diode.

The switching transistor (SWT) is controlled on-off by the scan signal (SCAN) applied through the scan line (SCL), a type of gate line (GL), and is connected to the first node (N1) of the driving transistor (DRT). It may be electrically connected between and the data line (DL).

When the switching transistor (SWT) is turned on by the scan signal (SCAN), the data voltage (Vdata) supplied through the data line (DL) is transmitted to the first node (N1) of the driving transistor (DRT).

The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

Each subpixel (SP) may have a 2T1C structure including two transistors (DRT, SWT) and one capacitor (Cst), and in some cases, may further include one or more transistors or one or more capacitors. More may be included.

The storage capacitor Cst is not a parasitic capacitor that may exist between the first node N1 and the second node N2 of the driving transistor DRT, but is an external capacitor intentionally designed outside the driving transistor DRT ( External Capacitor).

The driving transistor (DRT) and switching transistor (SWT) may be an n-type transistor or a p-type transistor, respectively.

Meanwhile, circuit elements such as a light emitting element (ED), two or more transistors (DRT, SWT), and one or more capacitors (Cst) are disposed on the display panel 110. Since these circuit elements are vulnerable to external moisture or oxygen, an encapsulation layer (ENCAP) may be disposed on the display panel 110 to prevent external moisture or oxygen from penetrating into the circuit elements.

In the touch display device 100 according to embodiments of the present disclosure, the touch panel (TSP) may be formed on the encapsulation layer (ENCAP) and embedded in the display panel 110. That is, in the touch display device 100, a plurality of touch electrodes (TE) forming the touch panel (TSP) may be disposed on the encapsulation layer (ENCAP) to form the display panel 110.

At this time, when the encapsulation layer (ENCAP) is composed of a plurality of layers, the touch electrode (TE) may be disposed between any first encapsulation layer and the second encapsulation layer.

The touch display device 100 is a capacitance-based touch sensing method, and may sense touch using a mutual capacitance method or a self-capacitance method.

In the case of a touch sensing method based on mutual capacitance, a plurality of touch electrodes (TE) have a touch driving electrode to which a touch driving signal is applied through a touch driving line, and a touch sensing signal is sensed through a touch sensing line. It can be classified into touch driving electrodes and touch sensing electrodes that form capacitance. At this time, it may be referred to as a touch line, including the touch driving line and the touch sensing line, and may be referred to as a touch signal, including the touch driving signal and the touch sensing signal.

At this time, the area of the touch driving electrode to which the touch driving signal is applied and the area of the touch sensing electrode to which the touch sensing signal is transmitted may be the same or different.

For example, when it is desired to relatively reduce the parasitic capacitance caused by the touch sensing electrode through which the touch sensing signal is transmitted, the area of the touch sensing electrode can be formed to be smaller than the area of the touch driving electrode. In this case, the area of the touch driving electrode to which the touch driving signal is applied and the area of the touch sensing electrode to which the touch sensing signal is transmitted may be in a ratio of 5:1 to 2:1. As one example, the area of the touch driving electrode and the area of the touch sensing electrode may have a ratio of 4:1.

In the case of this mutual capacitance-based touch sensing method, the presence or absence of touch and touch coordinates are detected based on the change in mutual capacitance that occurs between the touch driving electrode and the touch sensing electrode depending on the presence or absence of a pointer such as a finger or pen.

In the case of a self-capacitance-based touch sensing method, each touch electrode (TE) functions as both a touch driving electrode and a touch sensing electrode. That is, a touch driving signal is applied to the touch electrode (TE) through one touch line, and a touch sensing signal transmitted from the touch electrode (TE) to which the touch driving signal is applied is received through the same touch line. Therefore, in the self-capacitance-based touch sensing method, there is no distinction between the touch driving electrode and the touch sensing electrode and the touch driving line and the touch sensing line.

In the case of this self-capacitance-based touch sensing method, the presence or absence of touch and touch coordinates are detected based on the change in capacitance that occurs between a pointer such as a finger or pen and the touch electrode (TE).

As such, the touch display device 100 may sense a touch using a mutual capacitance-based touch sensing method, or may sense a touch using a self-capacitance-based touch sensing method.

FIG. 4 is a diagram briefly illustrating a touch electrode structure for mutual capacitance-based touch sensing in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 4, in the touch display device 100 according to embodiments of the present disclosure, the touch electrode structure for mutual capacitance-based touch sensing includes a plurality of X-touch electrodes (X-TE) and a plurality of Y- It may include a touch electrode (Y-TE). Here, the plurality of X-touch electrodes (X-TE) and the plurality of Y-touch electrodes (Y-TE) are located on the upper part of the encapsulation layer (ENCAP).

Each of the plurality of X-touch electrodes (X-TE) may be arranged in a first direction, and each of the plurality of Y-touch electrodes (Y-TE) may be arranged in a second direction different from the first direction.

In the present disclosure, the first direction and the second direction may be relatively different directions. For example, the first direction may be the x-axis direction and the second direction may be the y-axis direction. Conversely, the first direction may be the y-axis direction and the second direction may be the x-axis direction. Additionally, the first direction and the second direction may or may not be orthogonal to each other. Additionally, in this specification, rows and columns are relative, and the rows and columns may change depending on the viewing point of view.

Each of the plurality of X-touch electrodes (X-TE) may be composed of several electrically connected X-touch electrode segments. Each of the plurality of Y-touch electrodes (Y-TE) may be composed of several Y-touch electrode segments that are electrically connected.

Here, the plurality of X-touch electrodes (X-TE) and the plurality of Y-touch electrodes (Y-TE) are electrodes that are included in the plurality of touch electrodes (TE) and have distinct roles (functions). For example, the plurality of X-touch electrodes (X-TE) may be touch driving electrodes, and the plurality of Y-touch electrodes (Y-TE) may be touch sensing electrodes. Conversely, the plurality of X-touch electrodes (X-TE) may be touch sensing electrodes, and the plurality of Y-touch electrodes (Y-TE) may be touch driving electrodes.

The plurality of touch lines (TL) are connected to one or more X-touch lines (X-TL) connected to each of the plurality of X-touch electrodes (X-TE) and each of the plurality of Y-touch electrodes (Y-TE). It may include one or more Y-touch lines (Y-TL).

FIG. 5 is a diagram illustrating an equivalent circuit of subpixels constituting a display panel in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 5, in the touch display device 100 according to embodiments of the present disclosure, each of the plurality of subpixels (SP) includes a light emitting element (ED) and a driving transistor (DRT) for driving the light emitting element (ED). ), a switching transistor (SWT) that switches the electrical connection between the gate electrode of the driving transistor (DRT) and the data line (DL), and the gate electrode of the driving transistor (DRT) and the source electrode or drain electrode of the driving transistor (DRT) It may include a storage capacitor (Cst) electrically connected therebetween.

The gate electrode of the driving transistor DRT corresponds to the first node N1. The source electrode or drain electrode of the driving transistor (DRT) corresponds to the second node (N2). The drain electrode or source electrode of the driving transistor (DRT) corresponds to the third node (N3).

The light emitting device (ED) may include an anode electrode (AE), a light emitting layer (EL), and a cathode electrode (CE). The light emitting layer (EL) may be located on the anode electrode (AE), and the cathode electrode (CE) may be located on the light emitting layer (EL). The anode electrode (AE) may be referred to as a pixel electrode, and the cathode electrode (CE) may be referred to as a common electrode.

A light emitting device (ED) is a device for a self-luminous display and may include an organic light emitting diode (OLED), a light emitting device made of quantum dots, or a micro LED (Micro Light Emitting Diode). You can.

The drain electrode or source electrode of the switching transistor (SWT) may be electrically connected to the 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 (DRT) at the first node (N1). The gate electrode of the switching transistor (SWT) may be electrically connected to the scan signal line (SCL), which is a type of gate line (GL). The switching transistor (SWT) may be controlled on-off by the scan signal (SCAN) supplied from the scan signal line (SCL).

The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2. The storage capacitor Cst may serve to maintain the voltage difference between the first node N1 and the second node N2 for a certain period of time (eg, one frame time). The storage capacitor (Cst) is not an internal capacitor (parasitic capacitor) of the driving transistor (DRT), but is an external capacitor intentionally designed to drive the subpixel (SP).

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) is electrically connected to the source electrode or drain electrode of the driving transistor (DRT) at the second node (N2), and may also be electrically connected to the anode electrode (AE). 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 on-off by the sense signal (SENSE) supplied from the sense signal line (SENL).

The anode electrode (AE) is disposed in each subpixel (SP) and may be electrically connected to the source electrode or drain electrode of the driving transistor (DRT). That is, in the second node N2, the anode electrode AE may be electrically connected to the source electrode or drain electrode of the driving transistor DRT.

The cathode electrode (CE) may be commonly disposed in multiple subpixels (SP). A DC level base voltage (EVSS) with no change in voltage level may be applied to the cathode electrode (CE). Here, the base voltage EVSS may correspond to a common voltage commonly applied to the cathode electrode CE of the light emitting element ED of all subpixels SP.

In the touch display device 100 according to embodiments of the present disclosure, the display panel 110 may further include a plurality of base lines (EVSL) electrically connected to the cathode electrode (CE).

By using multiple base lines (EVSL), the base voltage (EVSS) can be uniformly applied to the entire area of the cathode electrode (CE). The base voltage (EVSS) supply method using multiple base lines (EVSL) can be a method of effectively supplying the base voltage (EVSS) to the large-area display panel 110.

FIG. 6 is a diagram showing an example of a cross-section of a display panel in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 6, the display panel 110 of the touch display device 100 according to embodiments of the present disclosure includes a substrate (SUB). A plurality of subpixels (SP) are formed on the substrate (SUB). Each of the plurality of subpixels (SP) includes an anode electrode (AE), a light emitting element (ED) including a light emitting layer (EL) and a cathode electrode (CE), a driving transistor (DRT) for driving the light emitting element (ED), and a driving transistor. It may include a switching transistor (SWT) that controls the connection between the gate electrode of the (DRT) and the data line (DL), and a storage capacitor (Cst) connected between the gate electrode of the driving transistor (DRT) and the anode electrode (AE). there is.

Transistors (DRT, SWT, SENT) and a capacitor (Cst) may be formed on the substrate (SUB), and light emitting elements (ED) may be formed. An encapsulation layer (ENCAP) may be formed on the cathode electrode (CE) of the light emitting elements (ED). The encapsulation layer (ENCAP) can prevent oxygen or moisture from penetrating into the light emitting device (ED).

A plurality of touch electrodes (TE) and color filters (CF) may be disposed on the encapsulation layer (ENCAP). At this time, the upper and lower positions between the touch electrode (TE) and the color filter (CF) located on the encapsulation layer (ENCAP) can be designed in various ways. For example, a color filter (CF) may be disposed on the encapsulation layer (ENCAP), and a touch electrode (TE) may be disposed on the color filter (CF). Alternatively, the touch electrode (TE) may be disposed on the encapsulation layer (ENCAP), and the color filter (CF) may be disposed on the touch electrode (TE).

Here, the sensing transistor (SENT) is omitted for convenience of explanation. Additionally, it is assumed that the source electrode (S1) of the driving transistor (DRT) is electrically connected to the anode electrode (AE), and the drain electrode (D2) of the switching transistor (SWT) is connected to the data line (DL).

A shield layer (SHD) may be disposed on the substrate (SUB).

A buffer layer (BUF) may be disposed on the shield layer (SHD).

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

The semiconductor layer ACT1 of the driving transistor DRT and the semiconductor layer ACT2 of the switching transistor SWT may be formed on the buffer layer BUF.

The semiconductor layer (ACT1) of the driving transistor (DRT) includes a channel portion (CH1), a source connection portion (CS1) located on one side of the channel portion (CH1), and a drain connection portion ( CD1) may be included. Here, the source connection part CS1 and the drain connection part CD1 may be a conductive part of a semiconductor material.

The semiconductor layer (ACT2) of the switching transistor (SWT) includes a channel part (CH2), a source connection part (CS2) located on one side of the channel part (CH2), and a drain connection part (CS2) located on the other side of the channel part (CH2). CD2) may be included. Here, the source connection portion (CS2) and the drain connection portion (CD2) may be a conductive portion of a semiconductor material.

One of the shield layers (SHD) formed below the buffer layer (BUF) constitutes the channel portion (CH1) that constitutes the semiconductor layer (ACT1) of the driving transistor (DRT) and the semiconductor layer (ACT2) of the switching transistor (SWT). It may overlap with at least one of the channel units (CH2). Accordingly, at least one of the channel portion (CH1) constituting the semiconductor layer (ACT1) of the driving transistor (DRT) and the channel portion (CH2) constituting the semiconductor layer (ACT2) of the switching transistor (SWT) is exposed to light (external light). Changes in channel characteristics can be prevented by blocking exposure to (or internal light).

A gate insulating film GI may be disposed on the semiconductor layer ACT1 of the driving transistor DRT and the semiconductor layer ACT2 of the switching transistor SWT to cover the channel portions CH1 and CH2. The gate electrode G1 of the driving transistor DRT 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 DRT may overlap the channel portion CH1 constituting the semiconductor layer ACT1 of the driving transistor DRT. The gate electrode G2 of the switching transistor SWT may overlap the channel portion CH2 constituting the semiconductor layer ACT2 of the switching transistor SWT.

A first interlayer insulating layer ILD1 may be disposed on the gate electrode G1 of the driving transistor DRT and the gate electrode G2 of the switching transistor SWT.

The source electrode S1 and the drain electrode D1 of the driving transistor DRT may be disposed on the first interlayer insulating layer ILD1. The source electrode S1 of the driving transistor DRT may be electrically connected to the source connection CS1 constituting the semiconductor layer ACT1 of the driving transistor DRT through a contact hole in the first interlayer insulating layer ILD1. The drain electrode D1 of the driving transistor DRT may be electrically connected to the drain connection CD1 forming the semiconductor layer ACT1 of the driving transistor DRT through a contact hole in the first interlayer insulating layer ILD1.

The source electrode S2 and the drain electrode D2 of the switching transistor SWT may be disposed on the first interlayer insulating layer ILD1.

The source electrode S2 of the switching transistor SWT may be electrically connected to the source connection portion CS2 constituting the semiconductor layer ACT2 of the switching transistor SWT through a contact hole in the first interlayer insulating layer ILD1. The drain electrode D2 of the switching transistor SWT may be electrically connected to the drain connection CD2 forming the semiconductor layer ACT2 of the switching transistor SWT through a contact hole in the first interlayer insulating layer ILD1.

The base line EVSL may be disposed on the first interlayer insulating layer ILD1. The base line (EVSL) may be connected to the shield layer (SHD) located below the base line (EVSL) through a contact hole in the first interlayer insulating layer (ILD1) and the buffer layer (BUF). When the base line (EVSL) and the shield layer (SHD) are connected, the resistance of the base line (EVSL) may decrease.

The passivation layer PAS may be disposed while covering the source electrodes S1 and S2, the drain electrodes D1 and D2, and the base line EVSL formed on the first interlayer insulating layer ILD1.

An overcoat layer (OC) may be disposed on the passivation layer (PAS). The overcoat layer OC may be disposed at a position overlapping the light emitting area EA of the subpixel SP. The overcoat layer (OC) may be disposed in a dam shape even at a location that does not overlap the light emitting area (EA).

An anode electrode (AE) may be disposed on the overcoat layer (OC) at a point defined by the emission area (EA) of the subpixel (SP). The anode electrode (AE) may be electrically connected to the source electrode (S1) of the driving transistor (DRT) through a contact hole in the overcoat layer (OC) and the passivation layer (PAS).

A bank BANK for defining the emission area EA of the subpixel SP may be disposed on the anode electrode AE. A part of the bank is opened and a part of the anode electrode (AE) is exposed. The open area of the bank (BANK) may correspond to the light emitting area (EA).

The light emitting layer EL may be disposed on the anode electrode AE exposed to the open area of the bank BANK. A cathode electrode (CE) may be disposed on the light emitting layer (EL).

A contact hole (CNT) is formed in the passivation layer (PAS) to connect to the base line (EVSL). Near the contact hole (CNT) of the passivation layer (PAS) for electrically connecting the cathode electrode (CE) and the base line (EVSL), the cathode electrode (CE) may be broken or a through hole may exist. The contact holes (CNT) of the passivation layer (PAS) for electrical connection between the cathode electrode (CE) and the base line (EVSL) include a relatively large first contact hole (CNT1) and a relatively small second contact hole (CNT2). may include.

The first contact hole (CNT1) for electrical connection between the cathode electrode (CE) and the base line (EVSL) is a contact hole for electrical connection between the anode electrode (AE) and the source electrode (S1) of the driving transistor (DRT). It can have a much larger width (diameter of the hole when viewed from above).

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

A portion of the cathode electrode (CE) may be electrically connected to a portion of the base line (EVSL) through the first contact hole (CNT1) of the passivation layer (PAS). Another part of the cathode electrode (CE) may be electrically connected to another part of the base line (EVSL) through the second contact hole (CNT2) of the passivation layer (PAS).

When another part of the cathode electrode (CE) is electrically connected to another part of the base line (EVSL) through the second contact hole (CNT2) of the passivation layer (PAS), it may be connected through the reflector (RP). Here, the reflector RP may be a layer formed of the same material as the anode electrode AE when the anode electrode AE is formed.

An encapsulation layer (ENCAP) may be disposed on the cathode electrode (CE). The encapsulation layer (ENCAP) can block external moisture or oxygen from penetrating into the light emitting element (ED), which is vulnerable to external moisture or oxygen. The encapsulation layer (ENCAP) may be one layer, but may also be comprised of multiple layers.

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

As a specific example, the encapsulation layer (ENCAP) may be formed by sequentially stacking a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. The first inorganic encapsulation layer may be formed on the substrate SUB on which the cathode electrode CE is formed closest to the light emitting device ED. For example, the first inorganic encapsulation layer may be formed of 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 the light emitting layer (EL) containing organic substances vulnerable to high temperature atmosphere from being damaged during the deposition process. The organic encapsulation layer may be formed to have a smaller area than 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 serves 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 may serve to enhance planarization performance. For example, the organic encapsulation layer may be formed of 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 the substrate (SUB) on which the organic encapsulation layer is formed to cover the top and side surfaces of the organic encapsulation layer and the first inorganic encapsulation layer, respectively. 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.

A touch buffer film (T-BUF) may be disposed on the encapsulation layer (ENCAP). The touch buffer film (T-BUF) may be designed to maintain a predetermined minimum separation distance (e.g., 5㎛) between the touch electrode (TE) and the cathode electrode (CE) of the light emitting element (ED). . Accordingly, the parasitic capacitance (Cp) formed between the touch electrode (TE) and the cathode electrode (CE) of the light emitting element (ED) can be reduced or prevented, and through this, the touch sensitivity due to the parasitic capacitance (Cp) It can prevent degradation. In addition, the touch buffer film (T-BUF) is exposed to organic substances such as chemical solutions (developer or etchant, etc.) used during the manufacturing process of the touch electrode (TE) disposed on the touch buffer film (T-BUF) or moisture from the outside. Penetration into the light emitting layer (EL) containing the material can be blocked.

The touch buffer film (T-BUF) can be formed at a low temperature below a certain temperature (e.g. 100 degrees Celsius) and has a low dielectric constant of 1 to 3 to prevent damage to the light emitting layer (EL) containing organic materials vulnerable to high temperatures. It is formed from an organic insulating material. For example, the touch buffer film (T-BUF) may be formed of an acrylic-based, epoxy-based, or siloxan-based material. The touch buffer film (T-BUF), which is made of an organic insulating material and has a flattening performance, is formed on the touch buffer film (T-BUF) due to damage to each encapsulation layer in the encapsulation layer (ENCAP) due to bending of the touch display device 100. This can prevent the touch electrode (TE) from breaking.

This touch buffer film (T-BUF) is not essential and may be omitted in some cases.

The touch electrode TE may be disposed on the touch buffer film T-BUF or the encapsulation layer ENCAP. Here, the touch electrode (TE) is shown as a mesh type.

A second interlayer insulating layer ILD2 may be disposed on the touch electrode TE. A color filter (CF) may be disposed on the second interlayer insulating layer (ILD2), and a black matrix may also be disposed together with the color filter (CF). Here, the color filter (CF) and black matrix may be components that can be selectively arranged.

A protective layer (PAC) may be disposed on the color filter (CF). The protective layer (PAC) may be combined with the cover glass (CG) through an adhesive layer (OCA). An anti-reflection film (ARF) may be disposed on the cover glass (CG). Here, the anti-reflection film (ARF) may be a film that can be selectively disposed.

Here, a cross-sectional view of the display area DA is shown. Near the boundary between the display area DA and the non-display area NDA of the display panel 110, the encapsulation layer ENCAP may include an outer slope. The display panel 110 may further include a dam area located at the end of the outer slope of the encapsulation layer (ENCAP) and a pad area located in the non-display area (NDA) and located further outside the dam area. You can.

The touch line TL may descend along the outer slope of the encapsulation layer (ENCAP), pass through the upper part of the dam area, and be electrically connected to the pad area.

The dam area may include one or more dams. When the liquid organic encapsulation layer is dropped on the display area (DA), the liquid organic encapsulation layer collapses in the direction of the non-display area (NDA) and invades the pad area. You can prevent it from happening. This effect can be further increased when the dam area includes multiple dams.

The dam forming material layer in the dam area may include the same material as the bank BANK for separating the subpixels SP from each other, or may include the same material as the spacer for maintaining the interlayer spacing. The dam area may have a structure in which a first inorganic encapsulation layer and/or a second inorganic encapsulation layer are stacked on a dam forming material layer.

The base line (EVSL) is located below the cathode electrode (CE) and may be electrically connected to the cathode electrode (CE).

At least one of the multiple base lines (EVSL) may have a potential difference from the adjacent data line (DL). Alternatively, at least one of the plurality of base lines (EVSL) may have a potential difference with one electrode connected to the adjacent data line (DL) among the source electrode (S2) and drain electrode (D2) of the adjacent switching transistor (SWT).

A passivation layer (PAS) may be disposed as at least one insulating layer on the plurality of base lines (EVSL). A plurality of contact holes (CNT1, CNT2) may be formed in the passivation layer (PAS) corresponding to at least one insulating layer. At this time, the cathode electrode (CE) may be electrically connected to a portion of the plurality of base lines (EVSL) exposed through the first contact hole (CNT1).

Each of the plurality of base lines (EVSL) is located on the same layer as at least one of the source electrode (S2), the drain electrode (D2), and the gate electrode (G2) of the switching transistor (SWT) included in the adjacent subpixel (SP). You can. Here, each of the multiple base lines (EVSL) may be located on the same layer as the source electrode (S2) and the drain electrode (D2) of the switching transistor (SWT) included in the adjacent subpixel (SP), and the switching transistor ( It may include the same material as the source electrode (S2) and drain electrode (D2) of SWT).

Area When the touch display device 100 according to embodiments of the present disclosure is a transparent display, area X may be a transparent area (also referred to as a transparent area).

In this structure, when a user touches the screen using a finger or a pen, capacitance Cf may be formed between the finger or pen and the touch electrode TE. This capacitance (Cf) is called finger capacitance (Cf).

Additionally, the cathode electrode (CE) and the touch electrode (TE) may be capacitively coupled. Accordingly, when a potential difference occurs between the cathode electrode (CE) and the touch electrode (TE), parasitic capacitance (Cp) may be formed between the cathode electrode (CE) and the touch electrode (TE).

FIG. 7 is a diagram showing an example of a signal applied to a touch electrode for time division driving in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 7 , the touch display device 100 according to embodiments of the present disclosure may perform the display driving period (DP) and the touch driving period (TP) in different time zones. That is, the touch display device 100 according to embodiments of the present disclosure may perform time division of the display driving period (DP) and the touch driving period (TP).

The touch display device 100 according to embodiments of the present disclosure may use the touch synchronization signal (Tsync) to distinguish between the display driving period (DP) and the touch driving period (TP).

For example, in the touch synchronization signal (Tsync), the first level (e.g., high level or low level) represents the display driving period (DP), and the second level (e.g., low level or high level) represents the touch driving period. (TP) can be indicated.

During the touch driving period (TP), all or part of the plurality of touch electrodes (TE) receive the touch driving signal (TDS).

During the display driving period DP, the plurality of touch electrodes TE may be floating, grounded, or may be applied with a common voltage of a specific level. For example, the touch electrode TE may receive a common voltage Vcom for a display driving operation during the display driving period DP and may receive a touch driving signal TDS during the touch driving period TP.

The touch driving signal (TDS) applied to the touch electrode (TE) during the touch driving period (TP) may be a signal at a constant level, or may be an alternating current signal whose voltage level changes. When the touch driving signal (TDS) is an alternating current signal, the touch driving signal (TDS) may also be referred to as a modulation signal or a pulse signal.

While the touch driving signal TDS is applied to the touch electrode TE, a direct current level signal may be applied to other electrodes around the touch electrode TE.

Meanwhile, while the touch driving signal (TDS) is applied to the touch electrode (TE) in the touch driving period (TP), the touch electrode (TE) may form parasitic capacitance with other surrounding electrodes. This parasitic capacitance can reduce touch sensitivity.

Accordingly, the touch display device 100 may apply the load free driving signal LFD to other electrodes around the touch electrode TE while applying the touch driving signal TDS to the touch electrode TE.

The load free driving signal (LFD) may be a touch driving signal (TDS) or a signal that corresponds to the touch driving signal (TDS) in terms of at least one of frequency, phase, voltage polarity, and amplitude.

Other electrodes surrounding the touch electrode (TE) may be a data line (DL), a gate line (GL), an anode electrode (AE), or other touch electrodes. In addition, it may be any electrode or signal wire in the vicinity. .

While the touch driving signal (TDS) is applied to the touch electrode (TE), it is loaded into one or more data lines (DL) located around the touch electrode (TE) or all data lines (DL) in the display panel 110. A free data signal (LFD_DATA) may be applied.

While the touch driving signal (TDS) is applied to the touch electrode (TE), it is loaded to one or more gate lines (GL) located around the touch electrode (TE) or to all gate lines (GL) in the display panel 110. A pre-gate signal (LFD_GATE) may be applied.

While the touch driving signal (TDS) is applied to the touch electrode (TE), it is loaded to one or more touch electrodes (TE) located around the touch electrode (TE) or to all remaining touch electrodes (TE) in the display panel 110. A free touch signal (LFD_Vcom) may be applied.

For example, in the case of a mutual-capacitance sensing structure, while the touch driving signal (TDS) is applied to the touch electrode (TE), a direct current level signal is applied to other electrodes around the touch electrode (TE), and self- In the case of a capacitance sensing structure, while the touch driving signal (TDS) is applied to the touch electrode (TE), the load free driving signal (LFD) in the form of a pulse can be applied to other electrodes around the touch electrode (TE).

FIG. 8 is a diagram showing an example of a touch circuit of a touch display device according to embodiments of the present disclosure.

Referring to FIG. 8, the touch circuit 150 according to embodiments of the present disclosure includes a first multiplexer circuit (MUX1), a sensing unit block including a plurality of sensing units (SU), a second multiplexer circuit (MUX2), and It may include an analog-to-digital converter (ADC), etc.

The first multiplexer circuit (MUX1) may include one or more multiplexers. The second multiplexer circuit (MUX2) may include one or more multiplexers.

Each sensing unit (SU) may include a pre-amplifier (Pre-AMP), an integrator (INTG), and a sample and hold circuit (SHA).

One pre-amplifier (Pre-AMP) may be electrically connected to one or more touch electrodes (TE).

One pre-amplifier (Pre-AMP) supplies a touch driving signal (TDS) to one touch electrode (TE) selected as a sensing target among a plurality of connectable touch electrodes (TE), and A touch sensing signal can be received from the applied touch electrode (TE).

The received touch sensing signal may be amplified in a pre-amplifier (Pre-AMP) and input to an integrator (INTG).

The pre-amplifier (Pre-AMP) and integrator (INTG) may be implemented integrated.

The integrator (INTG) integrates the signal output from the pre-amplifier (Pre-AMP).

The analog-to-digital converter (ADC) may convert the integrated value output from the integrator (INTG) into a digital value and supply touch sensing data to the touch controller 154.

The analog-to-digital converter (ADC) can output touch sensing data to the touch controller 154 grounded to the primary ground (GND1).

The pre-amplifier (Pre-AMP) may receive a touch sensing signal from the touch electrode (TE) disposed on the display panel 110 grounded to the secondary ground (GND2), which is different from the primary ground (GND1). Using this touch circuit 150, a touch sensing signal is received from the touch electrode (TE) disposed on the display panel 110 grounded to the secondary ground (GND2), and the touch electrode (TE) grounded to the primary ground (GND1) is received. By outputting touch sensing data to the controller 154, touch detection can be enabled in the touch display device 100 with two grounds (GND1 and GND2).

Meanwhile, the touch circuit 150 according to embodiments of the present disclosure may further include a signal transmission circuit (STC) for transmitting signals to the touch controller 154. In this case, the signal transfer circuit (STC) included in the touch circuit 150 according to embodiments of the present disclosure may be grounded to both the primary ground (GND1) and the secondary ground (GND2).

FIGS. 9 and 10 are diagrams for explaining cathode noise induced to a cathode electrode during a touch driving process and a decrease in touch sensitivity due to cathode noise in the display panel of a touch display device according to embodiments of the present disclosure.

Referring to FIGS. 9 and 10 , the touch circuit 150 of the touch display device 100 according to embodiments of the present disclosure may include one or more pre-amplifiers (Pre-AMP). The pre-amplifier (Pre-AMP) applies the touch reference voltage (Tref) to the non-inverting input terminal, and the touch sensing signal (TSS) transmitted from the touch sensing electrode (Rx) is applied to the inverting input terminal.

The touch reference voltage (Tref) applied to the non-inverting input terminal of the pre-amp may be a direct current voltage at a constant level, or at least one of the touch driving signal (TDS) and frequency, phase, voltage polarity, and amplitude. The above may be a corresponding pulse signal.

For example, in the case of a mutual-capacitance sensing structure in which the touch driving electrode (Tx) and the touch sensing electrode (Rx) are separated, the touch driving period (TP) during which the touch driving signal (TDS) is applied to the touch driving electrode (Tx) ), the touch reference voltage (Tref) at a direct current level may be applied without applying the load free driving signal (LFD) to the touch sensing electrode (Rx) in order to stably maintain the touch sensing electrode (Rx).

Alternatively, in the case of a self-capacitance sensing structure in which the touch driving electrode (Tx) and the touch sensing electrode (Rx) have the same role, during the touch driving period (TP) when the touch driving signal (TDS) is applied to the touch electrode (TE) The load free driving signal (LFD), which is the same as the touch driving signal (TDS), may be applied as the touch reference voltage (Tref).

A feedback capacitor (Cfb) and a reset switch (SWr) may be connected between the inverting input terminal and the output terminal of the pre-amplifier (Pre-AMP).

The touch driving signal (TDS) may be a signal whose voltage level changes and may have a predetermined frequency and amplitude.

When a user touches the screen using a finger or a pen, a finger capacitance (Cf) may be formed between the finger or pen and the touch driving electrode (Tx).

A mutual capacitance (Cm) may be formed between the touch driving electrode (Tx) and the touch sensing electrode (Rx), and the touch circuit 150 generates a touch sensing electrode (Rx) by the mutual capacitance (Cm). Touch coordinates can be sensed based on the signal (TSS).

At this time, while the touch driving signal (TDS) is applied to the touch electrode (TE) in the touch driving period (TP), the touch electrode (TE) may be capacitively coupled to other surrounding electrodes. Therefore, in order to reduce the effect of this coupling, the touch display device 100 applies a load-free driving signal to other electrodes around the touch electrode (TE) while applying the touch driving signal (TDS) to the touch electrode (TE). (LFD) can be approved

For example, the load free driving signal (LFD) can be applied to the anode electrode (AE) of the light emitting device (ED), the data line (DL) to which the data signal is applied, or the gate line (GL) to which the gate signal is applied. .

At this time, line noise may occur in signal lines (AE, DL, GL, etc.) to which the load free driving signal (LFD) is applied. Line noise may flow into the cathode electrode (CE) due to the first parasitic capacitance (Cp1) formed between the signal line (AE, DL, GL, etc.) and the cathode electrode (CE) to form cathode noise.

This cathode noise may be introduced into the touch electrodes (Tx, Rx) by the second parasitic capacitance (Cp2) formed between the cathode electrode (CE) and the touch electrodes (Tx, Rx), which causes the touch controller 154 to Noise is included in the transmitted touch output signal (Vsen), which reduces touch sensitivity.

The touch display device 100 of the present disclosure generates a common voltage compensation signal by receiving feedback from the common voltage (Vcom) containing cathode noise, supplies it to the cathode electrode (CE) during the display driving period (DP), and performs touch driving. By using this as the touch reference voltage (Tref) during the period (TP), quality degradation due to cathode noise can be reduced.

FIG. 11 is a block diagram illustrating the concept of generating a common voltage compensation signal through a common voltage feedback line in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 11 , in the touch display device 100 according to embodiments of the present disclosure, a horizontal common voltage line (CL_H) and a vertical common voltage line (CL_V) may be formed in the display panel 110.

The integrated integrated circuit 200 is mounted on the circuit film 210 to connect the display panel 110 and the printed circuit board 220, and the printed circuit board 220 includes a horizontal common voltage line (CL_H) and a vertical common voltage line. It may include a common voltage compensation circuit 230 that supplies a common voltage (Vcom) to the line (CL_V).

Here, an example is shown where a data driving integrated circuit (SDIC) and a touch driving integrated circuit (ROIC) are integrated and implemented as one integrated integrated circuit 200.

In the edge area of the display panel 110, a left common voltage line (CL_L) and a left feedback line (FL_L) are formed in an area adjacent to the left gate driving circuit 120a, and a left common voltage line (CL_L) and a left feedback line (FL_L) are formed in an area adjacent to the right gate driving circuit 120b. A right common voltage line (CL_R) and a right feedback line (FL_R) may be formed.

At this time, the gate driving circuit 120 may be formed only in the edge area of one side of the display panel 110, but in this case, the charging of the subpixel SP located on the opposite side is prevented by the resistance of the gate line GL. Because delays may cause errors in the on-off operation of the driving transistor (DRT), it is desirable to form the gate driving circuit 120 in edge areas on both sides of the display panel 110.

In addition, the left common voltage line (CL_L) is connected to the left common voltage line (CL_L) so that the gate driving circuit 120 can minimize contact with the gate line (GL) during the process of applying the gate driving voltage to the display panel 110 through the gate line (GL). and the right common voltage line (CL_R) are preferably placed between the gate driving circuit 120 and the display area, but the left feedback line (FL_L) and the right feedback line (FL_R) are preferably placed outside the gate driving circuit 120. do.

Inside the display panel 110, the horizontal common voltage line (CL_H) is arranged in a direction parallel to the gate line (GL), and the vertical common voltage line (CL_V) is arranged in a direction parallel to the data line (DL) to cross them. It can be electrically connected at any point.

The common voltage compensation circuit 230 may receive a power voltage and generate a common voltage (Vcom) of a predetermined level that is supplied to the cathode electrode (CE) of the light emitting element (ED) that emits light in the subpixel (SP).

The common voltage (Vcom) generated in the common voltage compensation circuit 230 is horizontally disposed on the display panel 110 through the left common voltage line (CL_L) and the right common voltage line (CL_R) along the common voltage line (CL). It may be applied to the common voltage line (CL_H) and to the vertical common voltage line (CL_V) disposed on the display panel 110 through the integrated integrated circuit 200.

A left feedback line (FL_L) electrically connected to the left common voltage line (CL_L) and a right feedback line (FL_R) electrically connected to the right common voltage line (CL_R) are formed in both edge areas of the display panel 110. . Accordingly, the common voltage compensation circuit 230 can receive feedback of the common voltage (Vcom) flowing through the cathode electrode of the light emitting device disposed on the display panel 110 through the left feedback line (FL_L) and the right feedback line (FL_R). .

The left common voltage line (CL_L) and the right common voltage line (CL_R) are connected to the output terminal of the common voltage compensation circuit 230 through the common voltage line (CL) formed on the circuit film 210 and the printed circuit board 220. You can.

The vertical common voltage line (CL_V) may be connected to the common voltage line (CL) formed on the printed circuit board 220 through the integrated integrated circuit 200, and the integrated integrated circuit 200 may provide a data voltage to the display panel 110. It can be electrically connected to the vertical common voltage line (CL_V) through a terminal that is not connected to the data line (DL) for supplying .

Left common voltage line (CL_L) and left feedback line (FL_L), right common voltage line (CL_R) and right feedback line (FL_R), horizontal common voltage line (CL_H) and vertical common voltage line disposed on the display panel 110. (CL_V) may be formed of the same material on the same layer as the common voltage line CL extending from the printed circuit board 220, or may be formed of a different material on a different layer.

Meanwhile, the vertical common voltage line (CL_V) connected from the integrated circuit 200 to the display panel 110 is used to minimize signal delay or reduction in signal level of the common voltage (Vcom) supplied to the cathode electrode of the light emitting device. , may be formed of a plurality of lines connected by jumping lines.

The number, location, thickness, and length of these vertical common voltage lines (CL_V) may be selected in various ways depending on the characteristics of the display panel 110.

Here, the common voltage compensation circuit 230 is shown as an example of being mounted as a separate circuit within the printed circuit board 220, but is located within a control circuit such as a power management circuit or timing controller, or within the integrated circuit 200. It may be located.

In the touch display device 100 of the present disclosure, the common voltage compensation circuit 230 receives the common voltage (Vcom) transmitted through the feedback lines (FL_L and FL_R) as feedback to generate a common voltage compensation signal, and generates a common voltage compensation signal during the display driving period ( By supplying a common voltage compensation signal to the cathode electrode (CE) in the DP) and using the common voltage compensation signal as the touch reference voltage (Tref) in the touch driving period (TP), quality degradation due to cathode noise can be reduced.

FIG. 12 is a block diagram conceptually showing the configuration of a common voltage compensation circuit in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 12, the touch display device 100 according to embodiments of the present disclosure receives feedback of the common voltage (Vcom) flowing through the cathode electrode (CE) of the display panel 110 and generates a compensation common voltage (Vcom_comp) or compensation. It may include a common voltage compensation circuit 230 that generates a touch reference voltage (Tref_comp).

The common voltage (Vcom) applied to the cathode electrode (CE) of the display panel 110 may have different phases or levels due to signal delay or resistance deviation depending on the location.

Accordingly, by dividing the display panel 110 into a plurality of blocks and forming different feedback lines (FL) in each block, a plurality of feedback common voltages (Vcom_FB) can be supplied.

Here, the display panel 110 is divided into four blocks of 2X2, the first feedback line (FL_L1) is connected to the first display block (DB1) on the upper left, and the second display block (DB2) is connected to the lower left. A second feedback line (FL_L2) is connected to, a third feedback line (FL_R1) is connected to the third display block (DB3) at the upper right, and a fourth feedback line (FL_R1) is connected to the fourth display block (DB4) at the lower right. The case of connecting FL_R2) is shown as an example.

Accordingly, the common voltage compensation circuit 230 compensates the cathode electrode (CE) through the first feedback line (FL_L1), the second feedback line (FL_L2), the third feedback line (FL_R1), and the fourth feedback line (FL_R2). Feedback common voltages (Vcom_FBL1, Vcom_FBL2, Vcom_FBR1, Vcom_FBR2) flowing through can be provided.

The common voltage compensation circuit 230 is a switching circuit that can select one feedback common voltage from among the plurality of feedback common voltages (Vcom_FBL1, Vcom_FBL2, Vcom_FBR1, Vcom_FBR2) supplied from the plurality of display blocks (DB1, DB2, DB3, DB4). It may include 232 and a compensation voltage generation circuit 234 that generates a compensation common voltage (Vcom_comp) or a compensation touch reference voltage (Tref_comp) using the selected feedback common voltage.

At this time, the compensation touch reference voltage (Tref_comp) is applied to the pre-amplifier (Pre_AMP) connected to the touch electrode (TE) close to the position where the feedback common voltage (Vcom_FB) used to generate the compensation touch reference voltage (Tref_comp) was detected. It is desirable to be

For example, the compensation touch reference voltage (Tref_comp) generated using the feedback common voltage (Vcom_FBL1) detected in the first display block (DB1) is connected to the touch electrode (TE) located in the first display block (DB1). By applying this to the preamplifier (Pre_AMP), more effective noise removal can be achieved.

FIG. 13 is a diagram illustrating in detail a switching circuit constituting a common voltage compensation circuit in a touch display device according to embodiments of the present disclosure, and FIG. 14 is a signal flow diagram illustrating the operation of the switching circuit as an example.

13 and 14, in the touch display device 100 according to embodiments of the present disclosure, the switching circuit 232 constituting the common voltage compensation circuit 230 includes a first multiplexer (MUX1) and a second It may include a multiplexer (MUX2) and selection switches (SWs).

The first multiplexer (MUX1) selects one feedback common voltage from among the plurality of feedback common voltages (Vcom_FBL1, Vcom_FBL2, Vcom_FBR1, Vcom_FBR2) supplied from the plurality of display blocks (DB1, DB2, DB3, DB4) and sets the compensation touch standard. It can be transmitted to the voltage generation circuit 234a.

The second multiplexer (MUX2) selects one feedback common voltage from among the plurality of feedback common voltages (Vcom_FBL1, Vcom_FBL2, Vcom_FBR1, Vcom_FBR2) supplied from the plurality of display blocks (DB1, DB2, DB3, and DB4) to provide a compensation common voltage. It can be transmitted to the generation circuit 234b.

The selection switch (SWs) is turned on during the display driving period (DP) to provide a plurality of feedback common voltages (Vcom_FBL1, Vcom_FBL2, Vcom_FBR1, Vcom_FBR2) supplied from a plurality of display blocks (DB1, DB2, DB3, DB4). 2 Delivered to the multiplexer (MUX2). Accordingly, the compensation common voltage generation circuit 234b uses the feedback common voltage delivered from the second multiplexer MUX2 during the display driving period DP to generate the compensation common voltage Vcom_comp to be supplied to the cathode electrode CE. You can.

On the other hand, since the selection switch (SWs) is turned off during the touch driving period (TP), the plurality of feedback common voltages (Vcom_FBL1, Vcom_FBL2, Vcom_FBR1, Vcom_FBR2) supplied from the plurality of display blocks (DB1, DB2, DB3, DB4) is transmitted to the first multiplexer (MUX1). Accordingly, the compensation touch reference voltage generation circuit 234a generates the compensation touch reference voltage Tref_comp to be supplied to the touch circuit 150 using the feedback common voltage delivered from the first multiplexer MUX1 during the touch driving period TP. can be created.

FIG. 15 is a diagram illustrating in detail a compensation voltage generation circuit constituting a common voltage compensation circuit in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 15, in the touch display device 100 according to embodiments of the present disclosure, the compensation voltage generation circuit 234 constituting the common voltage compensation circuit 230 includes a compensation touch reference voltage generation circuit 234a and It may include a compensation common voltage generation circuit 234b.

The compensation touch reference voltage generation circuit 234a may include a variable inductor (L1) connected between the input node and the output node, a variable capacitor (C1) and a variable resistor (R1) connected in parallel to the output node and in parallel to the other side. there is.

A touch reference voltage (Tref) in the form of a direct current level or pulse is applied to the input node. Additionally, the feedback common voltage (Vcom_FB) selected in the first multiplexer (MUX1) of the switching circuit 232 is applied to the variable capacitor (C1) and the variable resistor (R1) connected in parallel.

With this configuration, the compensation touch reference voltage generation circuit 234a overlaps the feedback common voltage (Vcom_FB) and the touch reference voltage (Tref) to generate a compensation touch reference voltage (Tref_comp) in which the noise of the cathode electrode (CE) is reflected. can do.

At this time, the compensation touch reference voltage Tref_comp can minimize cathode noise by varying the level or phase of the frequency of noise flowing into the cathode electrode CE.

To this end, the common voltage compensation circuit 230 may further include a frequency detection circuit 236 that detects the frequency of noise flowing into the cathode electrode (CE).

That is, a compensation touch standard that can minimize cathode noise by reflecting the frequency of the cathode noise detected in the frequency detection circuit 236 and controlling the variable inductor (L1), variable capacitor (C1), or variable resistor (R1). It will be possible to generate voltage (Tref_comp).

For example, when the frequency of the cathode noise is below the reference frequency, the variable inductor (L1), variable capacitor (C1), or variable resistor (R1) is set above the reference value, and when the frequency of the cathode noise is above the reference frequency, The variable inductor (L1), variable capacitor (C1), or variable resistor (R1) may be set below a reference value.

In the compensation common voltage generation circuit 234b, an input resistance (Ra) is connected to the inverting input terminal, a common voltage (Vcom) is applied to the non-inverting input terminal, and a feedback resistance (Rb) is provided between the inverting input terminal and the output terminal. It may include a connected amplifier (AMP).

With this configuration, the compensation common voltage generation circuit 234b can generate a compensation common voltage Vcom_comp that can reduce cathode noise introduced into the cathode electrode CE.

Additionally, the compensation common voltage Vcom_comp can minimize cathode noise by varying the level or phase of the frequency of noise flowing into the cathode electrode CE.

That is, by reflecting the frequency of the cathode noise detected in the frequency detection circuit 236 and controlling the input resistance (Ra) or feedback resistance (Rb), a compensation common voltage (Vcom_comp) that can minimize cathode noise can be generated. You will be able to.

FIG. 16 is a diagram illustrating an operation of improving noise of a touch output signal through a compensation touch reference voltage in a touch display device according to embodiments of the present disclosure.

Referring to FIG. 16, the touch driving circuit 152 of the touch display device 100 according to embodiments of the present disclosure may include one or more pre-amplifiers (Pre-AMP). The pre-amplifier (Pre-AMP) applies the compensation touch reference voltage (Tref_comp) generated by the common voltage compensation circuit 230 to the non-inverting input terminal, and applies the touch sensing signal transmitted from the touch sensing electrode (Rx) to the inverting input terminal. (TSS) is authorized.

The compensation touch reference voltage (Tref_comp) applied to the non-inverting input terminal of the pre-amplifier (Pre-AMP) is a signal reflecting the cathode noise introduced into the cathode electrode (CE).

A feedback capacitor (Cfb) and a reset switch (SWr) may be connected between the inverting input terminal and the output terminal of the pre-amplifier (Pre-AMP).

When a user touches the screen using a finger or a pen, a finger capacitance (Cf) may be formed between the finger or pen and the touch driving electrode (Tx).

A mutual capacitance (Cm) may be formed between the touch driving electrode (Tx) and the touch sensing electrode (Rx), and the touch circuit 150 generates a touch sensing electrode (Rx) by the mutual capacitance (Cm). A signal (TSS) can be received.

On the other hand, when touch sensing is performed using a self-capacitance sensing method, each of the touch electrodes (TE) can serve as a touch driving electrode and a touch sensing electrode. At this time, the touch circuit 150 may receive the touch sensing signal (TSS) based on the capacitance between each touch electrode (TE) and a touch object (eg, finger, pen, etc.).

At this time, while the touch driving signal (TDS) is applied to the touch electrode (TE) in the touch driving period (TP), the touch electrode (TE) may be capacitively coupled to other surrounding electrodes.

For example, line noise may flow into the anode electrode (AE) of the light emitting device (ED), the data line (DL) to which a data signal is applied, or the gate line (GL) to which a gate signal is applied. Line noise may flow into the cathode electrode (CE) due to parasitic capacitance formed between the signal line (AE, DL, GL, etc.) and the cathode electrode (CE), forming cathode noise.

However, the common voltage compensation circuit 230 receives the feedback common voltage (Vcom_FB) containing cathode noise, and uses the feedback common voltage (Vcom_FB) to generate a compensation touch reference voltage (Tref_comp) that can cancel out the cathode noise. can do.

Therefore, the touch display device 100 of the present disclosure supplies the compensation touch reference voltage (Tref_comp) to the non-inverting input terminal of the pre-amplifier (Pre-AMP) constituting the touch driving circuit 152 during the touch driving period (TP). By doing so, it is possible to generate a touch output signal (Vsen) from which cathode noise is removed.

In addition, the common voltage compensation circuit 230 receives a feedback common voltage (Vcom_FB) containing cathode noise, and uses the feedback common voltage (Vcom_FB) to generate a compensation common voltage (Vcom_comp) that can cancel out the cathode noise. You can.

Therefore, the touch display device 100 of the present disclosure provides compensation common voltage (Vcom_comp) to the cathode electrode (CE) of the display panel 110 during the display driving period (DP), thereby preventing degradation of image quality due to cathode noise. It can be prevented.

The embodiments of the present disclosure described above are briefly described as follows.

The touch display device 100 according to embodiments of the present disclosure includes a display panel 110 including a plurality of light emitting elements (ED) and a plurality of touch electrodes (TE), and a touch electrode to the plurality of touch electrodes (TE). A touch circuit 150 that detects a touch by applying a driving signal (TDS) and receiving a touch sensing signal (TSS) according to capacitance change, a timing controller 140 that controls the touch circuit 150, and Using the feedback common voltage (Vcom_FB) transmitted from the feedback line (FL) connected to the cathode electrode (CE) of the light emitting element (ED), a compensation touch reference voltage (Tref_comp) reflecting the cathode noise introduced into the cathode electrode (CE) is generated. ) or a common voltage compensation circuit 230 that generates a compensation common voltage (Vcom_comp), wherein the touch circuit 150 uses the compensation touch reference voltage (Tref_comp) to generate a touch output signal (Vsen) with reduced noise. ) can be created.

The plurality of touch electrodes (TE) may be formed on the encapsulation layer (ENCAP) covering the plurality of light emitting devices (ED).

The plurality of feedback lines FL may be connected one by one to the plurality of display blocks DB dividing the display panel 110.

The common voltage compensation circuit 230 includes a switching circuit 232 capable of selecting one feedback common voltage from among a plurality of feedback common voltages (Vcom_FB) transmitted from the plurality of feedback lines (FL), and the switching circuit 232 ) may include a compensation voltage generation circuit 234 that generates the compensation touch reference voltage (Tref_comp) using one feedback common voltage (Vcom_FB) selected from ).

The compensation voltage generation circuit 234 generates a touch reference voltage (Tref) supplied to an electrode to which a touch driving signal (TDS) is not applied during the touch driving period (TP) and a feedback common voltage selected from the switching circuit 232. A compensation touch reference voltage generation circuit 232a that generates the compensation touch reference voltage (Tref_comp) using (Vcom_FB), a common voltage (Vcom) supplied to the cathode electrode (CE) during the display driving period (DP), and It may include a compensation common voltage generation circuit 232b that generates a compensation common voltage (Vcom_comp) using one feedback common voltage (Vcom_FB) selected in the switching circuit 232.

The switching circuit 232 includes a selection switch (SWs) that transfers one feedback common voltage (Vcom_FB) selected in the switching circuit 232 to the compensation common voltage generation circuit 232b during the display driving period (DP). can do.

The common voltage compensation circuit 230 may further include a frequency detection circuit 236 that detects the frequency of the cathode noise.

The compensation touch reference voltage generation circuit 232a is connected between an input node and an output node, is connected in parallel to a variable inductor L1 to which the touch reference voltage Tref is applied, and the output node, and provides the selected feedback. It includes a variable capacitor (C1) and a variable resistor (R1) to which a common voltage (Vcom_FB) is applied, wherein the variable inductor (L1), the variable capacitor (C1), and the variable resistor (R1) are connected to the frequency detection circuit 236. ) can be controlled according to the frequency of the cathode noise detected.

The compensation common voltage generation circuit 232b is connected to an amplifier (AMP) and an inverting input terminal of the amplifier (AMP), and includes an input resistor (Ra) transmitting the selected feedback common voltage (Vcom_FB), and the amplifier ( It includes a feedback resistor (Rb) connected between the inverting input terminal and the output terminal of the amplifier (AMP), and the common voltage (Vcom) supplied to the cathode electrode (CE) is applied to the non-inverting input terminal of the amplifier (AMP), The input resistance (Ra) and the feedback resistance (Rb) may be controlled according to the frequency of the cathode noise detected by the frequency detection circuit 236.

The compensation touch reference voltage (Tref_comp) may be reflected on the touch electrode (TE) close to the position where the selected feedback common voltage (Vcom_FB) is detected.

In addition, the driving circuit of the present disclosure uses the feedback common voltage (Vcom_FB) transmitted from the feedback line (FL) connected to the cathode electrode (CE) of the light emitting element (ED) disposed on the display panel 110 to A common voltage compensation circuit 230 that generates a compensation touch reference voltage (Tref_comp) reflecting the cathode noise introduced into (CE), and a touch driving signal ( A touch circuit 150 that applies TDS), receives a touch sensing signal (TSS) according to capacitance change, and generates a touch output signal (Vsen) with reduced noise using the compensation touch reference voltage (Tref_comp). may include.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and therefore the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

100: touch display device
110: display panel
120, 120a, 120b: Gate driving circuit
130: data driving circuit
140: Timing controller
150: touch circuit
152: touch driving circuit
154: Touch controller
200: integrated integrated circuit
210: circuit film
220: printed circuit board
230: Common voltage compensation circuit
232: switching circuit
234: Compensation voltage generation circuit
234a: Compensation touch reference voltage generation circuit
234b: Compensated common voltage generation circuit
236: frequency detection circuit

Claims (19)

A display panel including a plurality of light emitting elements and a plurality of touch electrodes;
a touch circuit that detects a touch by applying a touch driving signal to the plurality of touch electrodes and receiving a touch sensing signal according to a change in capacitance;
a timing controller that controls the touch circuit; and
A common voltage compensation circuit that generates a compensation touch reference voltage reflecting cathode noise introduced into the cathode electrode using a feedback common voltage transmitted from a feedback line connected to the cathode electrode of the light emitting device,
A touch display device wherein the touch circuit generates a touch output signal with reduced noise using the compensated touch reference voltage.
According to claim 1,
The plurality of touch electrodes are
A touch display device formed on an encapsulation layer covering the plurality of light emitting devices.
According to claim 1,
The plurality of feedback lines are
A touch display device in which a plurality of display blocks dividing the display panel are connected one by one.
According to claim 1,
The common voltage compensation circuit is
a switching circuit capable of selecting one feedback common voltage among a plurality of feedback common voltages transmitted from the plurality of feedback lines; and
A touch display device comprising a compensation voltage generation circuit that generates the compensation touch reference voltage using one feedback common voltage selected in the switching circuit.
According to claim 4,
The compensation voltage generation circuit is
a compensation touch reference voltage generation circuit that generates the compensation touch reference voltage using a touch reference voltage supplied to an electrode to which a touch drive signal is not applied during the touch drive period and one feedback common voltage selected by the switching circuit; and
A touch display device comprising a compensation common voltage generation circuit that generates a compensation common voltage using a common voltage supplied to the cathode electrode during a display driving period and a feedback common voltage selected from the switching circuit.
According to claim 5,
The switching circuit is
A touch display device comprising a selection switch for transferring one feedback common voltage selected from the switching circuit to the compensation common voltage generation circuit during a display driving period.
According to claim 5,
The common voltage compensation circuit is
A touch display device further comprising a frequency detection circuit that detects the frequency of the cathode noise.
According to claim 7,
The compensation touch reference voltage generation circuit is
a variable inductor connected between an input node and an output node to which the touch reference voltage is applied; and
A variable capacitor and a variable resistor connected in parallel to the output node to which the selected feedback common voltage is applied,
The variable inductor, the variable capacitor, and the variable resistor are controlled according to the frequency of the cathode noise detected by the frequency detection circuit.
According to claim 7,
The compensation common voltage generation circuit is
amplifier;
an input resistor connected to the inverting input terminal of the amplifier and transmitting the selected feedback common voltage;
Including a feedback resistor connected between the inverting input terminal and the output terminal of the amplifier,
A common voltage supplied to the cathode electrode is applied to the non-inverting input terminal of the amplifier,
The input resistance and the feedback resistance are controlled according to the frequency of the cathode noise detected by the frequency detection circuit.
According to claim 7,
The compensation touch reference voltage is
A touch display device in which the selected feedback common voltage is reflected on a touch electrode close to a detected position.
a common voltage compensation circuit that uses a feedback common voltage transmitted from a feedback line connected to a cathode electrode of a light emitting device disposed on a display panel to generate a compensation touch reference voltage that reflects cathode noise introduced into the cathode electrode; and
A touch circuit that applies a touch driving signal to a plurality of touch electrodes disposed on the display panel, receives a touch sensing signal according to a change in capacitance, and generates a touch output signal with reduced noise using the compensation touch reference voltage. A driving circuit comprising:
According to claim 11,
The plurality of feedback lines are
A driving circuit connected one by one to a plurality of display blocks dividing the display panel.
According to claim 11,
The common voltage compensation circuit is
a switching circuit capable of selecting one feedback common voltage among a plurality of feedback common voltages transmitted from the plurality of feedback lines; and
A driving circuit including a compensation voltage generation circuit that generates the compensation touch reference voltage using one feedback common voltage selected in the switching circuit.
According to claim 13,
The compensation voltage generation circuit is
a compensation touch reference voltage generation circuit that generates the compensation touch reference voltage using a touch reference voltage supplied to an electrode to which a touch drive signal is not applied during the touch drive period and one feedback common voltage selected by the switching circuit; and
A driving circuit comprising a compensation common voltage generation circuit that generates a compensation common voltage using a common voltage supplied to the cathode electrode during a display driving period and a feedback common voltage selected from the switching circuit.
According to claim 14,
The switching circuit is
A driving circuit comprising a selection switch for transferring one feedback common voltage selected from the switching circuit to the compensation common voltage generating circuit during a display driving period.
According to claim 14,
The common voltage compensation circuit is
A driving circuit further comprising a frequency detection circuit that detects the frequency of the cathode noise.
According to claim 16,
The compensation touch reference voltage generation circuit is
a variable inductor connected between an input node and an output node to which the touch reference voltage is applied; and
A variable capacitor and a variable resistor connected in parallel to the output node to which the selected feedback common voltage is applied,
A driving circuit in which the variable inductor, the variable capacitor, and the variable resistor are controlled according to the frequency of the cathode noise detected by the frequency detection circuit.
According to claim 16,
The compensation common voltage generation circuit is
amplifier;
an input resistor connected to the inverting input terminal of the amplifier and transmitting the selected feedback common voltage;
Including a feedback resistor connected between the inverting input terminal and the output terminal of the amplifier,
A common voltage supplied to the cathode electrode is applied to the non-inverting input terminal of the amplifier,
A driving circuit in which the input resistance and the feedback resistance are controlled according to the frequency of the cathode noise detected by the frequency detection circuit.
According to claim 16,
The compensation touch reference voltage is
A driving circuit in which the selected feedback common voltage is reflected on a touch electrode close to the detected position.

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