Touch display device and touch sensing method

Abstract

Embodiments of the invention relate to a touch display device and a touch sensing method, and more specifically, to a touch display device and a touch sensing method capable of preventing touch sensitivity degradation and touch sensing errors that may be caused by a deviation in the size of image data for display.

Description

Technology Field

[0001] Embodiments of the present invention relate to a touch display device and a touch sensing method. Background Technology

[0002] As the information society advances, various types of display devices for displaying images are being developed. Among these various types of display devices, there are liquid crystal displays or similar devices that require a separate backlight unit located outside the display panel because the display panel itself cannot emit light. In contrast, self-emissive displays are being developed, such as OLED (Organic Light Emitting Diode) displays, in which light-emitting elements that emit light themselves are formed on the display panel.

[0003] In addition, nowadays, there are also touch display devices that deviate from conventional input methods such as buttons, keyboards, and mice, providing a touch-based input method that allows users to easily and intuitively input information or commands.

[0004] In the case of self-emissive displays, not only is it difficult to embed touch sensors in the display panel, but there is also a problem where touch sensitivity is reduced because touch sensing is affected by the operation of display-related electrodes or wiring present in the display panel. The problem to be solved

[0005] Embodiments of the present invention may provide a touch display device of the self-emissive display type with a built-in touch sensor and a touch sensing method.

[0006] Embodiments of the present invention can provide a touch display device and a touch sensing method that can prevent touch sensitivity degradation and touch sensing errors that may be caused by size deviations of image data for display.

[0007] Embodiments of the present invention can provide a touch display device and a touch sensing method capable of preventing touch sensitivity degradation and touch sensing errors caused by display-touch crosstalk deviations that occur according to the size deviation of image data for display. means of solving the problem

[0008] Embodiments of the present invention may provide a touch display device comprising: a display panel including a plurality of subpixels connected to a plurality of data lines and a plurality of gate lines, wherein each of the plurality of subpixels includes a light-emitting element and a driving transistor, and a plurality of touch electrodes; a data driving circuit that outputs an image data signal to a data line; a touch driving circuit that senses at least one of the plurality of touch electrodes to generate sensing data and outputs the sensing data; and a touch controller that detects whether a touch is present or calculates touch coordinates based on compensation sensing data in which the sensing data is changed according to the image data signal.

[0009] Depending on the voltage value of the video data signal, the touch sensing compensation value corresponding to the difference between the compensation sensing data and the sensing data may vary.

[0010] When the voltage value of the video data signal is the first voltage value, the touch sensing compensation value may have the first touch sensing compensation value.

[0011] If the voltage value of the video data signal is a second voltage value different from the first voltage value, the touch sensing compensation value may have a second touch sensing compensation value different from the first touch sensing compensation value.

[0012] The second voltage value is a higher grayscale voltage value than the first voltage value, and the second touch sensing compensation value may be a larger value than the first touch sensing compensation value.

[0013] A touch display device according to embodiments of the present invention may further include a lookup table that stores crosstalk data, and a crosstalk compensation unit that extracts or calculates and determines a crosstalk value corresponding to an image data signal by referring to the crosstalk data stored in the lookup table, and determines a touch sensing compensation value for sensing data output from a touch driving circuit based on the crosstalk value.

[0014] The crosstalk compensation unit can determine the crosstalk value corresponding to the image data signal and the subpixel to which the image data signal is supplied by referring to the crosstalk data stored in the lookup table.

[0015] Each of the plurality of touch electrodes overlaps with the area of ​​two or more subpixels, and the two or more subpixels may include a subpixel to which an image data signal is supplied.

[0016] The crosstalk data stored in the lookup table may include crosstalk data for a touch electrode and crosstalk data for a touch line electrically connected to the touch electrode.

[0017] Each of the plurality of touch electrodes overlaps with the area of ​​two or more subpixels, and the two or more subpixels may include subpixels to which image data signals are supplied and which emit light of different colors.

[0018] The crosstalk data stored in the lookup table may include crosstalk data for subpixels for each color.

[0019] When a touch driving signal with a fluctuating voltage level is applied to a first touch electrode among a plurality of touch electrodes, and the image data signal supplied to a first subpixel overlapping with the first touch electrode is an image data signal having a first voltage value, a signal with a fluctuating voltage level can be induced in the pixel electrode within the first subpixel with a first amplitude corresponding to the amplitude of the touch driving signal.

[0020] When the image data signal supplied to the first subpixel is an image data signal having a second voltage value higher than the first voltage value, the pixel electrode within the first subpixel may induce a signal in which the voltage level fluctuates with a second amplitude smaller than the amplitude of the touch driving signal.

[0021] A touch display device according to embodiments of the present invention may be a bottom light-emitting display. In this case, a plurality of touch electrodes may be located below a light-emitting element.

[0022] A touch display device according to embodiments of the present invention may be an upper light-emitting display. In this case, a plurality of touch electrodes may be located on an encapsulation layer.

[0023] Each of the plurality of touch electrodes is arranged in a mesh type and includes a plurality of electrically connected touch sensor metals, and one of the plurality of touch sensor metals can extend outside the area of ​​the touch electrode and be connected to a touch driving circuit.

[0024] A plurality of touch electrodes includes a first touch electrode and a second touch electrode adjacent in a first direction, the first touch electrode is configured with a plurality of touch sensor metals arranged in a mesh type and electrically connected, and the second touch electrode can be configured with a plurality of touch sensor metals arranged in a mesh type and electrically connected.

[0025] One of the plurality of touch sensor metals constituting the first touch electrode can be extended as a touch line and connected to a touch driving circuit across the second touch electrode.

[0026] The first touch electrode can overlap with the first subpixel, the second subpixel, the third subpixel, and the fourth subpixel.

[0027] The display panel may further include a first power line located on one side of the first subpixel, a second power line located on the other side of the fourth subpixel, and a third power line located between the second subpixel and the third subpixel.

[0028] A plurality of touch sensor metals constituting the first touch electrode may include one or more of a first touch sensor metal that overlaps with or is positioned adjacent to a first power line, a second touch sensor metal that overlaps with or is positioned adjacent to a second power line, a third touch sensor metal that overlaps with or is positioned adjacent to a third power line, and a fourth touch sensor metal that is electrically connected to the first touch sensor metal, the second touch sensor metal, and the third touch sensor metal.

[0029] The first touch sensor metal, the second touch sensor metal, the third touch sensor metal, and the fourth touch sensor metal may be placed on different layers.

[0030] Embodiments of the present invention may provide a touch sensing method for a touch display device comprising the steps of: sensing a touch electrode to generate sensing data; confirming an image data signal that overlaps with the touch electrode and is supplied to a subpixel for a display; and detecting whether a touch is present or calculating touch coordinates based on compensation sensing data that modifies the sensing data according to the image data signal.

[0031] A touch sensing method according to embodiments of the present invention may further include, after a verification step, a step of determining a touch sensing compensation value according to the voltage value of an image data signal and generating compensation sensing data from the sensing data and the touch sensing compensation value.

[0032] In the step of generating compensation sensing data, the touch display device may determine a crosstalk value corresponding to an image data signal by referring to crosstalk data stored in a lookup table and calculating a crosstalk value, and determine a touch sensing compensation value for the sensing data based on the crosstalk value.

[0033] In the step of generating compensation sensing data, the touch display device may determine by extracting or calculating a crosstalk value corresponding to the image data signal and the subpixel to which the image data signal is supplied by referring to crosstalk data stored in a lookup table. Effects of the invention

[0034] According to embodiments of the present invention, a touch display device of the self-emissive display type with a built-in touch sensor and a touch sensing method can be provided.

[0035] According to embodiments of the present invention, a touch display device and a touch sensing method can be provided that prevent a decrease in touch sensitivity and touch sensing errors that may be caused by a deviation in the size of image data for display.

[0036] According to embodiments of the present invention, a touch display device and a touch sensing method can be provided that prevent a decrease in touch sensitivity and a touch sensing error caused by a display-touch crosstalk deviation that occurs according to a deviation in the size of image data for display. Brief explanation of the drawing

[0037] FIG. 1 is a system configuration diagram of a touch display device according to embodiments of the present invention. FIG. 2 is an equivalent circuit of a subpixel of a touch display device according to embodiments of the present invention. FIG. 3 is a drawing showing a touch sensing system of a touch display device according to embodiments of the present invention. FIG. 4 is a cross-sectional view of a touch display device according to embodiments of the present invention. FIG. 5 is a diagram illustrating noise components generated during touch sensing of a touch display device according to embodiments of the present invention. FIG. 6 is a diagram illustrating a differential sensing method of a touch display device according to embodiments of the present invention. FIG. 7 is a diagram showing the connection structure of touch electrodes and touch lines in a touch display device according to embodiments of the present invention. FIG. 8 is a plan view of an area in which four subpixels are arranged in a touch display device according to embodiments of the present invention. FIG. 9 is a plan view showing a touch sensor structure in an area where four subpixels are arranged in a touch display device according to embodiments of the present invention. FIG. 10 is a drawing showing a first touch electrode, a first touch line, a second touch electrode, and a second touch line in a touch display device according to embodiments of the present invention. Figure 11 is a diagram showing the planar structure of an area where eight subpixels in Figure 10 are arranged. FIG. 12 is a diagram showing a display-touch crosstalk phenomenon when the image data signal is of the first type in a touch display device according to embodiments of the present invention. FIG. 13 is a diagram showing a display-touch crosstalk phenomenon when the image data signal is of the second type in a touch display device according to embodiments of the present invention. FIG. 14 is a diagram showing a system for display-touch crosstalk compensation of a touch display device according to embodiments of the present invention. FIG. 15 is a diagram illustrating a display-touch crosstalk compensation method according to embodiments of the present invention. FIG. 16 is a diagram illustrating a method for compensating for display-touch crosstalk induced by a touch electrode during display-touch crosstalk compensation according to embodiments of the present invention, and a method for deriving weights for subpixels by color for this purpose. FIG. 17 is a diagram showing a display-touch crosstalk curve for compensating for display-touch crosstalk induced by a touch electrode during display-touch crosstalk compensation according to embodiments of the present invention. FIG. 18 is a diagram illustrating a method for generating a lookup table for a red subpixel to compensate for display-touch crosstalk induced by a touch electrode during display-touch crosstalk compensation according to embodiments of the present invention. FIG. 19 is a diagram illustrating a method for compensating for display-touch crosstalk caused by a touch line when compensating for display-touch crosstalk according to embodiments of the present invention. FIG. 20 is a diagram illustrating a method for generating a lookup table for red subpixels to compensate for display-touch crosstalk caused by touch lines during display-touch crosstalk compensation according to embodiments of the present invention. FIG. 21 is a cross-sectional view of a touch display device including a touch sensor structure when the touch display device according to embodiments of the present invention is an upper light-emitting display. FIG. 22 is a flowchart of a touch sensing method for a touch display device according to embodiments of the present invention. Specific details for implementing the invention

[0038] Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. In assigning reference numerals to the components of each drawing, the same components may have the same reference numeral as much as possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the present invention, such detailed description may be omitted. Where terms such as "comprising," "having," or "consisting of" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it may include a plural unless there is a special explicit description otherwise.

[0039] Additionally, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present invention. These terms are used merely to distinguish the components from other components, and the essence, order, sequence, or number of the components are not limited by such terms.

[0040] In describing the positional relationship of components, where it is stated that two or more components are "connected," "combined," or "joined," it should be understood that while the two or more components may be directly "connected," "combined," or "joined," they may also be "connected," "combined," or "joined" with other components "intervened." Here, the other components may be included in one or more of the two or more components that are "connected," "combined," or "joined" with one another.

[0041] In describing the temporal flow relationship regarding components, methods of operation, or methods of production, for example, when the temporal or sequential relationship is described using "after," "following," "next," or "before," it may include cases where the relationship is not continuous unless "immediately" or "directly" is used.

[0042] Meanwhile, where numerical values ​​or corresponding information regarding a component (e.g., levels, etc.) are mentioned, even without separate explicit notation, the numerical values ​​or corresponding information may be interpreted as including a range of error that may occur due to various factors (e.g., process factors, internal or external shocks, noise, etc.).

[0043] FIG. 1 is a system configuration diagram of a touch display device (100) according to embodiments of the present invention.

[0044] Referring to FIG. 1, a touch display device (100) according to embodiments of the present invention may include a display panel (110) and a driving circuit for driving the display panel (110).

[0045] The driving circuit may include a data driving circuit (120) and a gate driving circuit (130), and may further include a display controller (140) that controls the data driving circuit (120) and the gate driving circuit (130).

[0046] A display panel (110) may include a substrate (SUB) and signal wiring such as a plurality of data lines (DL) and a plurality of gate lines (GL) disposed on the substrate (SUB). The display panel (110) may include a plurality of subpixels (SP) connected to a plurality of data lines (DL) and a plurality of gate lines (GL).

[0047] 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. In the display panel (110), a plurality of subpixels (SP) for displaying an image are arranged in the display area (DA), and driving circuits (120, 130, 140) may be electrically connected or driving circuits (120, 130, 140) may be mounted in the non-display area (NDA), and a pad portion to which an integrated circuit or printed circuit is connected may be arranged.

[0048] The data driving circuit (120) is a circuit for driving a plurality of data lines (DL) and can supply data signals to a plurality of data lines (DL). The gate driving circuit (130) is a circuit for driving a plurality of gate lines (GL) and can supply gate signals to a plurality of gate lines (GL). The display controller (140) can supply a data control signal (DCS) to the data driving circuit (120) to control the operation timing of the data driving circuit (120). The display controller (140) can supply a gate control signal (GCS) to the gate driving circuit (130) to control the operation timing of the gate driving circuit (130).

[0049] The display controller (140) can start scanning according to the timing implemented in each frame, convert externally input image data to match the data signal format used by the data driving circuit (120), supply the converted image data (Data) to the data driving circuit (120), and control data driving at an appropriate time in accordance with the scan.

[0050] The display controller (140) receives various timing signals, including a vertical synchronization signal (VSYNC), a horizontal synchronization signal (HSYNC), an input data enable signal (DE: Data Enable), a clock signal (CLK), etc., along with input video data from an external source (e.g., a host system (150)).

[0051] The display controller (140) receives timing signals such as a vertical synchronization signal (VSYNC), a horizontal synchronization signal (HSYNC), an input data enable signal (DE), and a clock signal (CLK) to control the data driving circuit (120) and the gate driving circuit (130), generates various control signals (DCS, GCS), and outputs them to the data driving circuit (120) and the gate driving circuit (130).

[0052] For example, the display controller (140) outputs various gate control signals (GCS: Gate Control Signal), including a gate start pulse (GSP: Gate Start Pulse), a gate shift clock (GSC: Gate Shift Clock), and a gate output enable signal (GOE: Gate Output Enable), in order to control the gate driving circuit (130).

[0053] Additionally, the display controller (140) outputs various data control signals (DCS), including a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE), in order to control the data driving circuit (120).

[0054] The display controller (140) may be implemented as a separate component from the data driving circuit (120), or it may be integrated with the data driving circuit (120) to be implemented as an integrated circuit.

[0055] The data driving circuit (120) receives image data (Data) from the display controller (140) and drives the multiple data lines (DL) by supplying data voltage to the multiple data lines (DL). Here, the data driving circuit (120) is also referred to as a source driving circuit.

[0056] This data driving circuit (120) may include one or more source driver integrated circuits (SDIC).

[0057] Each source driver integrated circuit (SDIC) may include a shift register, a latch circuit, a digital-to-analog converter (DAC), an output buffer, etc. Each source driver integrated circuit (SDIC) may additionally include an analog-to-digital converter (ADC) in some cases.

[0058] For example, each source driver integrated circuit (SDIC) may be connected to the display panel (110) by Tape Automated Bonding (TAB), connected to the bonding pad of the display panel (110) by Chip On Glass (COG) or Chip On Panel (COP), or connected to the display panel (110) by Chip On Film (COF).

[0059] The gate driving circuit (130) can output a gate signal of a turn-on level voltage or a gate signal of a turn-off level voltage according to the control of the display controller (140). The gate driving circuit (130) can sequentially drive a plurality of gate lines (GL) by sequentially supplying a gate signal of a turn-on level voltage to a plurality of gate lines (GL).

[0060] The gate driving circuit (130) may be connected to the display panel (110) via tape automatic bonding (TAB), connected to the bonding pad of the display panel (110) via chip-on-glass (COG) or chip-on-panel (COP) methods, or connected to the display panel (110) via chip-on-film (COF) methods. Alternatively, the gate driving circuit (130) may be formed in the non-display area (NDA) of the display panel (110) in the form of a gate-in-panel (GIP) type. The gate driving circuit (130) may be placed on a substrate (SUB) or connected to the substrate (SUB). That is, if the gate driving circuit (130) is of the GIP type, it may be placed in the non-display area (NDA) of the substrate (SUB). If the gate driving circuit (130) is of the chip-on-glass (COG) type, chip-on-film (COF) type, etc., it may be connected to the substrate (SUB).

[0061] Meanwhile, at least one of the data driving circuit (120) and the gate driving circuit (130) may be placed in the display area (DA). For example, at least one of the data driving circuit (120) and the gate driving circuit (130) may be placed so as not to overlap with the subpixels (SP), or may be placed so as to partially or entirely overlap with the subpixels (SP).

[0062] The data driving circuit (120) can convert image data (Data) received from the display controller (140) into an analog data voltage and supply it to a plurality of data lines (DL) when a specific gate line (GL) is opened by the gate driving circuit (130).

[0063] The data driving circuit (120) may be connected to one side (e.g., the upper side or the lower side) of the display panel (110). Depending on the driving method, panel design method, etc., the data driving circuit (120) may be connected to both sides (e.g., the upper side and the lower side) of the display panel (110), or to two or more sides of the four sides of the display panel (110).

[0064] The gate driving circuit (130) may be connected to one side (e.g., left or right) of the display panel (110). Depending on the driving method, panel design method, etc., the gate driving circuit (130) may be connected to both sides (e.g., left and right) of the display panel (110), or to two or more of the four sides of the display panel (110).

[0065] The display controller (140) may be a timing controller used in conventional display technology, or a control device capable of performing other control functions including a timing controller, or a control device different from a timing controller, or a circuit within a control device. The display controller (140) may be implemented as various circuits or electronic components such as an IC (Integrate Circuit), FPGA (Field Programmable Gate Array), ASIC (Application Specific Integrated Circuit), or processor.

[0066] The display controller (140) is mounted on a printed circuit board, a flexible printed circuit, etc., and can be electrically connected to a data driving circuit (120) and a gate driving circuit (130) through the printed circuit board, the flexible printed circuit, etc.

[0067] The display controller (140) can transmit and receive signals to and from the data driving circuit (120) according to one or more predetermined interfaces. Here, for example, the interface may include an LVDS (Low Voltage Differential Signaling) interface, an EPI interface, an SPI (Serial Peripheral Interface), etc.

[0068] The display controller (140) may include one or more storage media, such as registers.

[0069] The touch display device (100) according to the embodiments may be a display including a backlight unit such as a liquid crystal display, or a self-emissive display such as an OLED (Organic Light Emitting Diode) display, a Quantum Dot display, or a Micro LED (Micro Light Emitting Diode) display.

[0070] In the case where the touch display device (100) according to the embodiments is an OLED display, each subpixel (SP) may include a self-emitting organic light-emitting diode (OLED) as a light-emitting element. In the case where the touch display device (100) according to the embodiments is a quantum dot display, each subpixel (SP) may include a light-emitting element made of a quantum dot, which is a semiconductor crystal that emits light. In the case where the touch display device (100) according to the embodiments is a micro LED display, each subpixel (SP) may include a self-emitting micro LED (Micro Light Emitting Diode) made of an inorganic material as a light-emitting element.

[0071] FIG. 2 is an equivalent circuit of a subpixel (SP) of a touch display device (100) according to embodiments of the present invention.

[0072] Referring to FIG. 2, in a touch display device (100) according to embodiments of the present invention, each subpixel (SP) may include a light-emitting element (ED), a driving transistor (DRT) that controls the current flowing to the light-emitting element (ED) to drive the light-emitting element (ED), a scan transistor (SCT) that transmits a data voltage (Vdata) to a first node (N1) which is the gate node of the driving transistor (DRT), and a storage capacitor (Cst) for maintaining the voltage for a certain period of time.

[0073] Referring to FIG. 2, in a touch display device (100) according to embodiments of the present invention, each subpixel (SP) may further include a sense transistor (SENT) for initialization operation and sensing operation, etc.

[0074] The subpixel (SP) exemplified in Fig. 2 is said to have a 3T (Transistor) 1C (Capacitor) structure because it has three transistors (DRT, SCT, SENT) and one capacitor (Cst) to drive the light-emitting element (ED).

[0075] A light-emitting element (ED) includes a pixel electrode (PE) and a common electrode (CE), and a light-emitting layer (EL) located between the pixel electrode (PE) and the common electrode (CE). The pixel electrode (PE) of the light-emitting element (ED) may be an anode electrode or a cathode electrode, and the common electrode (CE) may be a cathode electrode or an anode electrode. The light-emitting element (ED) may be, for example, an organic light-emitting diode (OLED), a light-emitting diode (LED), a quantum dot light-emitting element, etc.

[0076] A base voltage (EVSS) may be applied to the common electrode (CE) of the light-emitting element (ED). Here, the base voltage (EVSS) may be, for example, a ground voltage or a voltage similar to a ground voltage.

[0077] The driving transistor (DRT) is a transistor for driving a light-emitting element (ED) and includes a first node (N1), a second node (N2), and a third node (N3).

[0078] The first node (N1) of the driving transistor (DRT) is a node corresponding to the gate node and can be electrically connected to the source node or drain node of the scan transistor (SCT). The second node (N2) of the driving transistor (DRT) can be electrically connected to the pixel electrode (PE) of the light-emitting element (ED) and can be the source node or drain node. The third node (N3) of the driving transistor (DRT) is a node to which the driving voltage (EVDD) is applied and can be electrically connected to the driving voltage line (DVL) that supplies the driving voltage (EVDD), and can be the drain node or source node. Below, for convenience of explanation, the second node (N2) of the driving transistor (DRT) is the source node and the third node (N3) is the drain node, as an example.

[0079] The scan transistor (SCT) can control the connection between the first node (N1) of the driving transistor (DRT) and the corresponding data line (DL) among the plurality of data lines (DL) by responding to a scan signal (SCAN) supplied from a corresponding scan signal line (SCL) among a plurality of scan signal lines (SCL) which is a type of gate line (GL).

[0080] The drain node or source node of the scan transistor (SCT) may be electrically connected to the corresponding data line (DL). The source node or drain node of the scan transistor (SCT) may be electrically connected to the first node (N1) of the driving transistor (DRT). The gate node of the scan transistor (SCT) may be electrically connected to a scan signal line (SCL), which is a type of gate line (GL), to receive a scan signal (SCAN).

[0081] The scan transistor (SCT) is turned on by a scan signal (SCAN) of a turn-on level voltage and can transmit the data voltage (Vdata) supplied from the corresponding data line (DL) to the first node (N1) of the driving transistor (DRT).

[0082] The scan transistor (SCT) is turned on by a scan signal (SCAN) of a turn-on level voltage and turned off by a scan signal (SCAN) of a turn-off level voltage. Here, if the scan transistor (SCT) is of the n-type, the turn-on level voltage may be a high-level voltage and the turn-off level voltage may be a low-level voltage. If the scan transistor (SCT) is of the p-type, the turn-on level voltage may be a low-level voltage and the turn-off level voltage may be a high-level voltage.

[0083] The sense transistor (SENT) can control the connection between the second node (N2) of the driving transistor (DRT), which is electrically connected to the pixel electrode (PE) of the light-emitting element (ED), and the corresponding reference voltage line (RVL) among the plurality of reference voltage lines (RVL) in response to the sense signal (SENSE) supplied from the corresponding sense signal line (SENL) among the plurality of sense signal lines (SENL), which is a type of gate line (GL).

[0084] The drain node or source node of the sense transistor (SENT) can be electrically connected to the reference voltage line (RVL). The source node or drain node of the sense transistor (SENT) can be electrically connected to the second node (N2) of the driving transistor (DRT) and can be electrically connected to the pixel electrode (PE) of the light-emitting element (ED). The gate node of the sense transistor (SENT) can be electrically connected to the sense signal line (SENL), which is a type of gate line (GL), to receive the sense signal (SENSE).

[0085] The sense transistor (SENT) is turned on and can apply the reference voltage (Vref) supplied from the reference voltage line (RVL) to the second node (N2) of the driving transistor (DRT).

[0086] The sense transistor (SENT) is turned on by a sense signal (SENSE) of a turn-on level voltage and turned off by a sense signal (SENSE) of a turn-off level voltage. Here, if the sense transistor (SENT) is of the n-type, the turn-on level voltage may be a high-level voltage and the turn-off level voltage may be a low-level voltage. If the sense transistor (SENT) is of the p-type, the turn-on level voltage may be a low-level voltage and the turn-off level voltage may be a high-level voltage.

[0087] The storage capacitor (Cst) is electrically connected between the first node (N1) and the second node (N2) of the driving transistor (DRT) and can maintain a data voltage (Vdata) corresponding to the video signal voltage or a corresponding voltage for one frame time.

[0088] The storage capacitor (Cst) may be an external capacitor intentionally designed outside the driving transistor (DRT), rather than a parasitic capacitor (e.g., Cgs, Cgd) which is an internal capacitor existing between the first node (N1) and the second node (N2) of the driving transistor (DRT).

[0089] Each of the driving transistor (DRT), scan transistor (SCT), and sense transistor (SENT) may be an n-type transistor or a p-type transistor. All of the driving transistor (DRT), scan transistor (SCT), and sense transistor (SENT) may be n-type transistors or p-type transistors. At least one of the driving transistor (DRT), scan transistor (SCT), and sense transistor (SENT) may be an n-type transistor (or p-type transistor) and the others may be p-type transistors (or n-type transistors).

[0090] The 3T1C structure of the subpixel (SP) exemplified in FIG. 2 is merely an example for illustrative purposes and may include one or more additional transistors, or, in some cases, one or more additional capacitors. Alternatively, each of the multiple subpixels may have the same structure, or some of the multiple subpixels may have different structures.

[0091] Meanwhile, the touch display device (100) according to the embodiments of the present invention may have a top emission structure or a bottom emission structure. However, for convenience of explanation, the touch display device (100) according to the embodiments of the present invention is described below as having a bottom emission structure.

[0092] One reference voltage line (RVL) can be placed for every four subpixel columns. That is, one reference voltage line (RVL) can be shared by the subpixels (SP) included in the four subpixel columns.

[0093] In addition, one driving voltage line (DVL) can be placed for every four subpixel columns. That is, one driving voltage line (DVL) can be shared by the subpixels (SP) included in the four subpixel columns.

[0094] FIG. 3 is a drawing showing a touch sensing system of a touch display device (100) according to embodiments of the present invention.

[0095] Referring to FIG. 3, a touch display device (100) according to embodiments of the present invention includes a touch sensing system for touch sensing. The touch sensing system may include a plurality of touch electrodes (TE) that act as touch sensors, and a touch circuit (300) that drives and senses the plurality of touch electrodes (TE) to determine whether a touch is present and / or touch coordinates.

[0096] The touch circuit (300) may include a touch driving circuit (310) that drives and senses a plurality of touch electrodes (TE) and outputs sensing data, and a touch controller (320) that controls the touch driving circuit (310) and determines whether a touch is made and / or touch coordinates using the sensing data.

[0097] A plurality of touch electrodes (TE) may be placed inside the display panel (110). That is, the display panel (110) may contain a touch sensor. The touch display device (100) according to embodiments of the present invention is said to have an in-cell touch sensor structure.

[0098] A plurality of touch lines (TL) for electrically connecting a plurality of touch electrodes (TE) and a touch driving circuit (310) may be arranged in the display panel (110).

[0099] The size of each of the multiple touch electrodes (TE) may correspond to the size of a single subpixel (SP).

[0100] Alternatively, the size of each of the multiple touch electrodes (TE) may correspond to the size of two or more subpixels (SP). That is, each of the multiple touch electrodes (TE) may overlap with the area of ​​two or more subpixels (SP).

[0101] The shape of each of the multiple touch electrodes (TE) can be designed in various ways.

[0102] Each of the multiple touch electrodes (TE) may be a plate type without openings or a mesh type with openings. If each of the multiple touch electrodes (TE) is a plate type without openings, each of the multiple touch electrodes (TE) may be a transparent electrode. If each of the multiple touch electrodes (TE) is a mesh type with openings, all or part of the openings may correspond to the light-emitting area of ​​a subpixel (SP).

[0103] FIG. 4 is a cross-sectional view of a display panel (110) of a touch display device (100) according to embodiments of the present invention.

[0104] Referring to FIG. 4, the display panel (110) includes a cover glass, a transparent adhesive layer (OCR) on the cover glass, a polarizing plate (POL) disposed on the transparent adhesive layer (OCR), and a substrate (SUB) disposed on the polarizing plate (POL).

[0105] Referring to FIG. 4, the display panel (110) may include first and second layer touch sensor metals (TSM_L1, TSM_L2) located on different layers. Touch electrodes (TE) and touch lines (TL) may be formed using the first and second layer touch sensor metals (TSM_L1, TSM_L2).

[0106] An interlayer insulating film (ILD) may be located between the first and second layer touch sensor metals (TSM_L1, TSM_L2). A touch electrode (TE) may be formed using one or more of the first and second layer touch sensor metals (TSM_L1, TSM_L2). A touch line (TL) may be formed using one or more of the first and second layer touch sensor metals (TSM_L1, TSM_L2).

[0107] One or more insulating layers (SOG) may be located on the first and second layer touch sensor metals (TSM_L1, TSM_L2) and the interlayer insulating film (ILD). The insulating layers (SOG) located on the first and second layer touch sensor metals (TSM_L1, TSM_L2) may be formed through a spin-on glass technique. Here, the spin-on glass technique may be a process of forming an insulating film by applying glass melted in an organic solvent to a surface where the insulating layer (SOG) is to be formed, and then heat-treating it.

[0108] A transistor (TFT) can be formed on an insulating layer (SOG) formed by the spin-on-glass technique.

[0109] A transistor (TFT) may include multiple insulating layers, an active layer (ACT), a gate electrode (G), a source electrode (S), and a drain electrode (D). The transistor (TFT) exemplified in FIG. 4 is a driving transistor (DRT) of FIG. 2 having a source electrode (S) connected to a pixel electrode (PE).

[0110] Referring to FIG. 4, a light shield (LS) that overlaps with the active layer (ACT) may be disposed below the active layer (ACT) of the driving transistor (DRT). In some cases, the light shield (LS) may be electrically connected to the source electrode (S) of the driving transistor (DRT) to stabilize the channel of the driving transistor (DRT).

[0111] Referring to FIG. 4, a portion of the light shield (LS) may overlap with a pattern (CP) that may be made of the same material as the active layer (ACT). This pattern (CP) can serve to increase the capacitance of the storage capacitor (Cst) by forming a double storage capacitor (Cst) within the subpixel (SP).

[0112] Referring to FIG. 4, a color filter (CF) may be placed on an insulating layer on a transistor (TFT). Referring to FIG. 4, an organic light-emitting diode (OLED) may be formed as a light-emitting element (ED) on the transistor (TFT). The organic light-emitting diode (OLED) may be composed of a pixel electrode (PE), a light-emitting layer (EL), and a common electrode (CE).

[0113] Referring to FIG. 4, an overcoat layer (OC) is positioned on a transistor (TFT) and a color filter (CF), a pixel electrode (PE) is positioned on the overcoat layer (OC), and the pixel electrode (PE) can be connected to the source electrode (S) of a driving transistor (DRT) through a contact hole of the overcoat layer (OC).

[0114] Referring to FIG. 4, a bank may be located on the pixel electrode (PE). The bank may be a black bank capable of blocking light. An emitting layer (EL) may be placed on the upper part of the bank and in the open area of ​​the bank. In the open area of ​​the bank, the emitting layer (EL) is located on the pixel electrode (PE).

[0115] A common electrode (CE) is disposed on the light-emitting layer (EL). A metal encapsulation layer (FSM) and an adhesive layer (FSP) that adheres to the bottom and also has an encapsulation function may be disposed on the common electrode (CE).

[0116] Referring to FIG. 4, when the display panel (110) is a bottom light-emitting type, the first and second layer touch sensor metals (TSM_L1, TSM_L2), which can form a touch sensor including a plurality of touch electrodes (TE) and a plurality of touch lines (TL), etc., can be placed between the transistor (TFT) and the substrate (SUB).

[0117] Referring to FIG. 4, the display panel (110) may further include a color filter (CF) placed between a plurality of touch electrodes (TE) and pixel electrodes (PE) in the case of bottom light emission.

[0118] In a lower light-emitting structure as shown in FIG. 4, a touch electrode (TE) composed of one or more of the first and second layer touch sensor metals (TSM_L1, TSM_L2) can form a parasitic capacitor with a pixel electrode (PE) which may be an anode electrode. Due to display driving, unavoidable voltage fluctuations may occur in the pixel electrode (PE), and these voltage fluctuations correspond to unwanted noise components from the perspective of the touch electrode (TE). Therefore, touch sensitivity by a finger or pen (20) may be reduced.

[0119] FIG. 5 is a diagram for explaining noise components generated during touch sensing of a touch display device (100) according to embodiments of the present invention.

[0120] Referring to FIG. 5, a touch display device (100) according to embodiments of the present invention performs display driving for image display and touch driving for touch sensing. Accordingly, in the touch display device (100) according to embodiments of the present invention, the display driving is affected by the touch driving, and the touch driving is affected by the display driving.

[0121] Referring to FIG. 5, when a touch electrode (TE) is formed in an in-cell manner inside a display panel (110), the touch electrode (TE) can form a crosstalk coupling capacitor (Cdtx) with the pixel electrode (PE) of a light-emitting element (ED). Here, the crosstalk coupling capacitor (Cdtx) is a type of parasitic capacitor that can act as an unnecessary load for display driving and touch driving.

[0122] Referring to FIG. 5, the touch driving circuit (310) may include a preamplifier (PRE-AMP). The preamplifier (PRE-AMP) includes a first input terminal (I1) into which a touch driving signal (TDS) is input, a second input terminal (I2) connected to a touch electrode (TE), and an output terminal (OUT) that outputs an output signal (VOUT), and may include a feedback capacitor (Cfb) connected between the second input terminal (I2) and the output terminal (OUT). The touch driving signal (TDS) may be a signal in which the voltage level swings with a constant amplitude (ΔV_TDS).

[0123] When a touch driving signal (TDS) is applied to the touch electrode (TE), a voltage fluctuation occurs in the touch electrode (TE), and the voltage fluctuation in the touch electrode (TE) causes a voltage fluctuation in the pixel electrode (PE) by the crosstalk coupling capacitor (Cdtx).

[0124] When a touch driving signal (TDS) is applied to the touch electrode (TE), voltage fluctuation occurs and current can be induced.

[0125] When the voltage level rises in the touch driving signal (TDS), it exerts a distributed influence (TDX) on the pixel electrodes (PE) within a plurality of subpixels (SP) that overlap with the corresponding touch electrode (TE).

[0126] When the voltage level of the touch driving signal (TDS) falls, the induced currents from the pixel electrodes (PE) within multiple subpixels (SP) that overlap with the corresponding touch electrode (TE) are concentrated and summed up on a single touch electrode (TE), causing a significant impact (DTX). In other words, a considerably large induced current, equivalent to noise, is generated in a single touch electrode (TE), significantly affecting the sensing value at the touch electrode (TE).

[0127] Since the amount of current flowing through the driving transistor (DRT) varies depending on the magnitude of the data voltage (Vdata) corresponding to the voltage applied to the pixel electrode (PE), the amount of current induced by the waveform of the touch driving signal (TDS) may also vary. This phenomenon of varying current amounts can be further exacerbated when the data voltage (Vdata) changes between the black data voltage and the white data voltage. If the aforementioned difference in the amount of induced current occurs, unexpected touch sensing errors may occur.

[0128] In other words, due to the coupling between the touch electrode (TE) and the pixel electrode (PE) embedded in the display panel (110), when a touch driving signal (TDS) is applied to the touch electrode (TE), an unwanted current may be induced in the touch electrode (TE). The magnitude of the current induced in the touch electrode (TE) may vary depending on the data voltage (Vdata) of each subpixel (SP). This difference in induced current may cause touch sensing errors.

[0129] Below, touch sensing methods that can prevent or minimize such touch sensing errors are described.

[0130] FIG. 6 is a drawing for explaining a differential sensing method of a touch display device (100) according to embodiments of the present invention.

[0131] A touch display device (100) according to embodiments of the present invention has a lower light-emitting structure and a touch sensor structure corresponding thereto. Accordingly, a touch display device (100) according to embodiments of the present invention may include a substrate (SUB), a driving transistor (DRT) disposed on the substrate (SUB), a pixel electrode (PE) electrically connected to a source node or drain node which is a second node (N2) of the driving transistor (DRT), a light-emitting layer (EL) located on the pixel electrode (PE), a common electrode (CE) located on the light-emitting layer (EL), and an encapsulation layer located on the common electrode (CE), and may include a plurality of touch electrodes (TE) and a plurality of touch lines (TL) disposed between the substrate (SUB) and the driving transistor (DRT).

[0132] Referring to FIG. 6, the touch driving circuit (310) of the touch display device (100) according to embodiments of the present invention can differentially sense a plurality of touch electrodes (TE). For example, the touch driving circuit (310) can perform differential sensing of a first touch electrode (TE1) and a second touch electrode (TE2) among the plurality of touch electrodes (TE).

[0133] Accordingly, the decrease in touch sensitivity caused by noise occurring within the display panel (110) of the touch display device (100) can be prevented.

[0134] The display panel (110) includes a plurality of touch lines (TL) that electrically connect a plurality of touch electrodes (TE) and a touch driving circuit (310). The plurality of touch lines (TL) may include a first touch line (TL1) that electrically connects a first touch electrode (TE1) and a touch driving circuit (310), and a second touch line (TL2) that electrically connects a second touch electrode (TE2) and a touch driving circuit (310).

[0135] Referring to FIG. 6, the first touch electrode (TE1) and the second touch electrode (TE2) may exist electrically separated within the display panel (110). The first touch line (TL1) may overlap with the first touch electrode (TE1) and the second touch electrode (TE2), and the second touch line (TL2) may overlap with the second touch electrode (TE2).

[0136] Referring to FIG. 6, the touch driving circuit (310) may include a differential amplifier (DAMP) for differential sensing. The differential amplifier (DAMP) may include a first input terminal (DI1), a second input terminal (DI2), and an output terminal (DOUT). The differential amplifier (DAMP) may include one or more feedback capacitors. For example, a feedback capacitor may be connected between the first input terminal (DI1) and the output terminal (DOUT), and a feedback capacitor may be connected between the second input terminal (DI2) and the output terminal (DOUT). The output terminal (OUT) of the differential amplifier (DAMP) may be one or two.

[0137] The first input terminal (DI1) of the differential amplifier (DAMP) is electrically connected to the first touch electrode (TE1) through the first touch line (TL1). The second input terminal (DI2) of the differential amplifier (DAMP) is electrically connected to the second touch electrode (TE2) through the second touch line (TL2).

[0138] The touch driving circuit (310) may further include a multiplexer circuit that selects a first touch line (TL1) and a second touch line (TL2) among a plurality of touch lines (TL) and connects them to the first input terminal (DI1) and the second input terminal (DI2) of a differential amplifier (DAMP).

[0139] As described above, the multiplexer circuit may be included inside the touch driving circuit (310), but may also be mounted on the display panel (110). In this case, the size of the touch driving circuit (310) can be reduced, or the number of touch drivers (TDC) within the touch driving circuit (310) can be reduced.

[0140] When differential sensing, the first touch electrode (TE1) is the touch electrode to be sensed, and the second touch electrode (TE2) may be the reference touch electrode.

[0141] Referring to FIG. 6, the touch driving circuit (310) may further include an integrator (INTG) and an analog-to-digital converter (ADC). The integrator (INTG) can output an integrated value by integrating a differential sensing signal (VOUT) output from the output terminal (DOUT) of a differential amplifier (DAMP). The analog-to-digital converter (ADC) can convert the integrated value output from the integrator (INTG) into a digital value corresponding to the sensing value.

[0142] The touch driving circuit (310) can provide sensing data including sensing values ​​converted by an analog-to-digital converter (ADC) to the touch controller (320). The touch controller (320) can determine whether a touch is present and / or the touch coordinates using the sensing data.

[0143] As described above, the touch display device (100) according to the embodiments of the present invention senses touches using a differential sensing method, thereby canceling out various noises (induced current and deviations) generated during touch sensing and obtaining accurate touch sensing results.

[0144] Below, a structure for arranging a touch sensor in conjunction with a display driving structure for arranging a touch sensor on a self-emissive touch display device (100) is described in more detail.

[0145] FIG. 7 is a diagram showing the connection structure of touch electrodes (TE1, TE2, TE3, TE4) and touch lines (TL1, TL2, TL3, TL4) in a touch display device (100) according to embodiments of the present invention.

[0146] Referring to FIG. 7, the display panel (110) may include first to fourth touch electrodes (TE1 to TE4) arranged in the same column and first to fourth touch lines (TL1 to TL4) connected to correspond to the first to fourth touch electrodes (TE1 to TE4).

[0147] The first to fourth touch lines (TL1~TL4) can be connected to the first to fourth touch electrodes (TE1~TE4) in correspondence through the line contact hole (CNT_TL).

[0148] Referring to FIG. 7, when each of the first to fourth touch electrodes (TE1 to TE4) is of the mesh type, each of the multiple touch electrodes (TE1 to TE4) may include a routing area (RA), a left electrode area (LEA) located to the left of the routing area (RA), and a right electrode area (REA) located to the right of the routing area (RA).

[0149] Referring to FIG. 7, each of the plurality of touch electrodes (TE1 to TE4) may include: 1) two or more left column line electrodes (TE1_L, TE2_L, TE3_L, TE4_L) located within the left electrode area (LEA) and arranged in a column direction; 2) two or more right column line electrodes (TE1_R, TE2_R, TE3_R, TE4_R) located within the right electrode area (REA) and arranged in a column direction; and 3) two or more row connection line electrodes (TE1_CL, TE2_CL, TE3_CL, TE4_CL) electrically connecting two or more left column line electrodes (TE1_L, TE2_L, TE3_L, TE4_L) and two or more right column line electrodes (TE1_R, TE2_R, TE3_R, TE4_R) and arranged in a row direction across the routing area (RA).

[0150] A plurality of touch lines (TL1 to TL4) pass through the routing area (RA) of each of the plurality of touch electrodes (TE1 to TE4) in a column direction. The plurality of touch lines (TL1 to TL4) can be electrically connected to two or more row connection line electrodes (TE1_CL, TE2_CL, TE3_CL, TE4_CL) included in each of the plurality of touch electrodes (TE1 to TE4).

[0151] Two or more left column line electrodes (TE1_L, TE2_L, TE3_L, TE4_L) and two or more right column line electrodes (TE1_R, TE2_R, TE3_R, TE4_R) included in each of the plurality of touch electrodes (TE1~TE4) may include one of the first and second layer touch sensor metals (TSM_L1, TSM_L2) (e.g., TSM_L1 or TSM_L2).

[0152] Two or more row connection line electrodes (TE1_CL, TE2_CL, TE3_CL, TE4_CL) included in each of the plurality of touch electrodes (TE1~TE4) may include the remaining one of the first and second layer touch sensor metals (TSM_L1, TSM_L2) (e.g., TSM_L2 or TSM_L1).

[0153] A plurality of touch lines (TL) may include two or more left column line electrodes (TE1_L, TE2_L, TE3_L, TE4_L) and two or more right column line electrodes (TE1_R, TE2_R, TE3_R, TE4_R) and the same touch sensor metal (e.g., TSM_L1 or TSM_L2) among the first and second layer touch sensor metals (TSM_L1, TSM_L2).

[0154] As described above, each of the plurality of touch electrodes (TE) is arranged in a mesh type and includes a plurality of electrically connected touch sensor metals, and one of the plurality of touch sensor metals can be extended outside the area of ​​the touch electrode (TE) and connected to a touch driving circuit (310).

[0155] A plurality of touch electrodes (TE) include a first touch electrode (TE) and a second touch electrode (TE) adjacent in a first direction, and the first touch electrode (TE1) is composed of a plurality of touch sensor metals arranged in a mesh type and electrically connected, and the second touch electrode (TE2) can be composed of a plurality of touch sensor metals arranged in a mesh type and electrically connected.

[0156] One of the plurality of touch sensor metals constituting the first touch electrode (TE) can be extended as a touch line (TL1) and connected to a touch driving circuit (310) across the second touch electrode (TE).

[0157] The above-described structure is explained in more detail using the first touch electrode (TE1) and the second touch electrode (TE2), which are adjacent to each other in the first direction, as a representative example.

[0158] Referring to FIG. 7, the first touch line (TL1) and the second touch line (TL2) pass through the routing area (RA) of the first touch electrode (TE1) and the routing area (RA) of the second touch electrode (TE2), and the first touch electrode (TE1) has two or more first left column line electrodes (TE1_L) disposed only in the left electrode area (LEA) of the first touch electrode (TE1) with respect to the routing area (RA) of the first touch electrode (TE1), two or more first right column line electrodes (TE1_R) disposed only in the right electrode area (REA) of the first touch electrode (TE1) with respect to the routing area (RA) of the first touch electrode (TE1), and two or more first electrodes arranged in a row direction across the routing area (RA) of the first touch electrode (TE1) and electrically connecting two or more first left column line electrodes (TE1_L) and two or more first right column line electrodes (TE1_R) through a plurality of electrode contact holes (CNT_TE). It may include a low connection line electrode (TE1_CL).

[0159] Among the first touch line (TL1) and the second touch line (TL2) passing through the routing area (RA) of the first touch electrode (TE1), the first touch line (TL1) can be electrically connected to two or more first row connection line electrodes (TE1_CL) through one or more line contact holes (CNT_TL).

[0160] The second touch electrode (TE2) may include two or more second left column line electrodes (TE2_L) disposed only in the left electrode region (LEA) of the second touch electrode (TE2) based on the routing region (RA) of the second touch electrode (TE2), two or more second right column line electrodes (TE2_R) disposed only in the right electrode region (REA) of the first touch electrode (TE1) based on the routing region (RA) of the second touch electrode (TE2), and two or more second row connection line electrodes (TE2_CL) disposed in a row direction across the routing region (RA) of the second touch electrode (TE2) and electrically connecting two or more second left column line electrodes (TE2_L) and two or more second right column line electrodes (TE2_R) through a plurality of electrode contact holes (CNT_TE).

[0161] Among the first touch line (TL1) and the second touch line (TL2) passing through the routing area (RA) of the second touch electrode (TE2), the second touch line (TL2) can be electrically connected to two or more second row connection line electrodes (TE2_CL) through one or more line contact holes (CNT_TL).

[0162] FIG. 8 is a plan view of an area in which four subpixels (SP1~SP4) are arranged in a touch display device (100) according to embodiments of the present invention, and FIG. 9 is a plan view showing a touch sensor structure (TSM1~TSM4) in an area in which four subpixels (SP1~SP4) are arranged in a touch display device (100) according to embodiments of the present invention. FIG. 9 is a drawing in which only the touch sensor structure (TSM1~TSM4) is added to FIG. 8.

[0163] Referring to FIG. 8, a display panel (110) according to embodiments of the present invention may include a first subpixel (SP1) located on a substrate (SUB) and including a first pixel electrode (PE1) and a first light-emitting layer (EL), a second subpixel (SP2) located on a substrate (SUB) and including a second pixel electrode (PE2) and a second light-emitting layer (EL), a first data line (DL1) with a first data voltage (Vdata1) to the first subpixel (SP1), and a second data line (DL2) with a second data voltage (Vdata2) to the second subpixel (SP2).

[0164] Additionally, the display panel (110) according to embodiments of the present invention may further include a first power line (VL1) located to the left of a first subpixel (SP1) and extending in a column direction, and a second power line (VL2) positioned to the right of a second subpixel (SP2) and extending in a column direction.

[0165] Additionally, the display panel (110) according to embodiments of the present invention may further include a first bridge wiring (BL1) connected to a first power line (VL1) and a second bridge wiring (BL2) connected to a second power line (VL2).

[0166] Referring to FIG. 8, the first bridge line (BL1) and the second bridge line (BL2) may be located on a different layer from the first power line (VL1) and the second power line (VL2).

[0167] Referring to FIG. 8, the first bridge line (BL1) can be electrically connected to the first power line (VL1) through the first contact hole (CNT1), and the second bridge line (BL2) can be electrically connected to the second power line (VL2) through the second contact hole (CNT2).

[0168] Referring to FIG. 8, a display panel (110) according to embodiments of the present invention may further include a third power line (VL3) located between a first subpixel (SP1) and a second subpixel (SP2) and extending in a column direction, and a third bridge wiring (BL3) electrically connected to the third power line (VL3) and extending in a row direction.

[0169] The third power line (VL3) is located on a different floor from the third bridge wiring (BL3) and can cross the third bridge wiring (BL3).

[0170] The third power line (VL3) may be located on the same floor as the first power line (VL1) and the second power line (VL2), and on a different floor from the first bridge line (BL1) and the second bridge line (BL2).

[0171] Referring to FIG. 8, a display panel (110) according to embodiments of the present invention may further include a third subpixel (SP3) located to the left of a first subpixel (SP1) and including a third pixel electrode (PE3) and a third light-emitting layer (EL), a fourth subpixel (SP4) located to the right of a second subpixel (SP2) and including a fourth pixel electrode (PE4) and a fourth light-emitting layer (EL), a third data line (DL3) located parallel to a first data line (DL1) between the first subpixel (SP1) and the third subpixel (SP3) and arranged to extend in a column direction, and a fourth data line (DL4) located parallel to a second data line (DL2) between the second subpixel (SP2) and the fourth subpixel (SP4) and arranged to extend in a column direction.

[0172] The first power line (VL1) can be located to the left of the third subpixel (SP3).

[0173] The second power line (VL2) can be located to the right of the fourth subpixel (SP4).

[0174] The third power line (VL3) can be located between the first subpixel (SP1) and the second subpixel (SP2).

[0175] The first bridge wiring (BL1) intersects the third data line (DL3) and the first data line (DL1), and the second bridge wiring (BL2) may intersect the second data line (DL2) and the fourth data line (DL4).

[0176] The power applied to the first power line (VL1) and the second power line (VL2), and the power applied to the third power line (VL3) may have different voltage levels.

[0177] For example, the power applied to the first power line (VL1) and the second power line (VL2) may be a driving voltage (EVDD), and the power applied to the third power line (VL3) may be a reference voltage (Vref). The driving voltage (EVDD) is typically a high voltage of 10V or higher, and the reference voltage (Vref) may typically be a low voltage near 0V. Accordingly, the power applied to the first power line (VL1) and the second power line (VL2) may be a power having a higher voltage level than the power applied to the third power line (VL3).

[0178] As another example, the power applied to the first power line (VL1) and the second power line (VL2) may be a reference voltage (Vref), and the power applied to the third power line (VL3) may be a driving voltage (EVDD). The driving voltage (EVDD) is typically a high voltage of 10V or higher, and the reference voltage (Vref) may typically be a low voltage near 0V. Accordingly, the power applied to the first power line (VL1) and the second power line (VL2) may be a power having a lower voltage level than the power applied to the third power line (VL3).

[0179] For convenience of explanation, it is assumed below that the power applied to the first power line (VL1) and the second power line (VL2) is the driving voltage (EVDD), and the power applied to the third power line (VL3) is the reference voltage (Vref). That is, it is assumed that the first power line (VL1) and the second power line (VL2) are the driving voltage lines (DVL), and the third power line (VL3) is the reference voltage line (RVL).

[0180] The first subpixel (SP1) and the third subpixel (SP3) can receive a driving voltage (EVDD) from the first power line (VL1).

[0181] For example, the third subpixel (SP3) can receive the driving voltage (EVDD) directly from the first power line (VL1), and the first subpixel (SP1) can receive the driving voltage (EVDD) from the first bridge wiring (BL1) connected to the first power line (VL1).

[0182] As another example, the first subpixel (SP1) and the third subpixel (SP3) can receive a driving voltage (EVDD) from the first bridge wiring (BL1) connected to the first power line (VL1).

[0183] The second subpixel (SP2) and the fourth subpixel (SP4) can receive a driving voltage (EVDD) from the second power line (VL2).

[0184] For example, the fourth subpixel (SP4) can receive the driving voltage (EVDD) directly from the second power line (VL2), and the second subpixel (SP2) can receive the driving voltage (EVDD) from the second bridge wiring (BL2) connected to the second power line (VL2).

[0185] As another example, the second subpixel (SP2) and the fourth subpixel (SP4) can receive a driving voltage (EVDD) from the second bridge wiring (BL2) connected to the second power line (VL2).

[0186] Referring to FIG. 8, the first to fourth subpixels (SP4) may be a red subpixel emitting red light, a white subpixel emitting white light, a blue subpixel emitting blue light, and a green subpixel emitting green light.

[0187] The first to fourth subpixels (SP4) can form a single pixel.

[0188] The first to fourth subpixels (SP4) can receive a reference voltage (Vref) from the third power line (VL3).

[0189] For example, among the first to fourth subpixels (SP4), the first subpixel (SP1) and the second subpixel (SP2) can directly receive a reference voltage (Vref) from the third power line (VL3). Additionally, the third subpixel (SP3) and the fourth subpixel (SP4) can receive a reference voltage (Vref) from the third bridge wiring (BL3) connected to the third power line (VL3).

[0190] As another example, all of the first to fourth subpixels (SP4) can receive a reference voltage (Vref) from a third bridge wiring (BL3) connected to a third power line (VL3).

[0191] A driving transistor (DRT) included in the first subpixel (SP1) may include a gate node to which a first data voltage (Vdata1) is applied, a source node or drain node to which the first pixel electrode (PE1) is electrically connected, and a drain node or source node to which the first power line (VL1) is electrically connected.

[0192] The driving transistor (DRT) included in the third subpixel (SP3) may include a gate node to which the third data voltage (Vdata3) is applied, a source node or drain node to which the third pixel electrode (PE3) is electrically connected, and a drain node or source node to which the first power line (VL1) is electrically connected.

[0193] The driving transistor (DRT) included in the second subpixel (SP2) may include a gate node to which the second data voltage (Vdata2) is applied, a source node or drain node to which the second pixel electrode (PE2) is electrically connected, and a drain node or source node to which the second power line (VL2) is electrically connected.

[0194] The driving transistor (DRT) included in the fourth subpixel (SP4) may include a gate node to which the second data voltage (Vdata2) is applied, a source node or drain node to which the fourth pixel electrode (PE4) is electrically connected, and a drain node or source node to which the second power line (VL2) is electrically connected.

[0195] Meanwhile, the common electrode (CE) may be located on the light-emitting layer (EL) of each of the first to fourth subpixels (SP1 to SP4). Accordingly, the light-emitting element (ED) of each of the first to fourth subpixels (SP1 to SP4) may be configured. In the display panel (110), an encapsulation layer (FSP) located on the common electrode (CE) may be further located.

[0196] Referring to FIG. 9, a display panel (110) according to embodiments of the present invention may further include one or more first touch sensor metals (TSM1) that overlap with or are adjacent to a first power line (VL1) and one or more second touch sensor metals (TSM2) that overlap with or are adjacent to a second power line (VL2).

[0197] Referring to FIG. 9, a display panel (110) according to embodiments of the present invention may further include one or more third touch sensor metals (TSM3) that overlap with or are positioned adjacent to the third power line (VL3).

[0198] One or more third touch sensor metals (TSM3) may be located between the first bridge wiring (BL1) and the second bridge wiring (BL2). One or more third touch sensor metals (TSM3) do not overlap with the first bridge wiring (BL1) and do not overlap with the second bridge wiring (BL2).

[0199] Referring to FIG. 9, a display panel (100) according to embodiments of the present invention may further include a fourth touch sensor metal (TSM4) that is electrically connected to a third touch sensor metal (TSM3) and extends in a row direction.

[0200] The fourth touch sensor metal (TSM4) can overlap with the third bridge wiring (BL3).

[0201] Among the first to fourth touch sensor metals (TSM1 to TSM4), the fourth touch sensor metal (TSM4) is arranged to extend in the row direction differently from the first to third touch sensor metals (TSM1 to TSM3).

[0202] The fourth touch sensor metal (TSM4) may be located on a different layer from at least one of the first touch sensor metal (TSM1), the second touch sensor metal (TSM2), and the third touch sensor metal (TSM3).

[0203] For example, among the first layer touch sensor metal (TSM_L1) and the second layer touch sensor metal (TSM_L2) located on a higher layer, the first touch sensor metal (TSM1), the second touch sensor metal (TSM2), and the third touch sensor metal (TSM3) may be the first layer touch sensor metal (TSM_L1), and the fourth touch sensor metal (TSM4) may be the second layer touch sensor metal (TSM_L2).

[0204] As another example, among the first layer touch sensor metal (TSM_L1) and the second layer touch sensor metal (TSM_L2) located in a higher layer, the first touch sensor metal (TSM1), the second touch sensor metal (TSM2), and the third touch sensor metal (TSM3) may be the second layer touch sensor metal (TSM_L2), and the fourth touch sensor metal (TSM4) may be the first layer touch sensor metal (TSM_L1).

[0205] A plurality of touch sensor metals constituting the first touch electrode (TE) may include one or more of a first touch sensor metal (TSM1) that overlaps with or is adjacent to a first power line (VL1), a second touch sensor metal (TSM2) that overlaps with or is adjacent to a second power line (VL2), and a third touch sensor metal (TSM3) that overlaps with or is adjacent to a third power line (VL3), and a fourth touch sensor metal (TSM4) that is electrically connected to the first touch sensor metal (TSM1), the second touch sensor metal (TSM2), and the third touch sensor metal (TSM3).

[0206] For example, the first touch sensor metal (TSM1), the third touch sensor metal (TSM3), and the fourth touch sensor metal (TSM4) may be some of the touch sensor metals constituting the first touch electrode (TE1) of the mesh type. And, the second touch sensor metal (TSM2) may be some of the touch sensor metals constituting the second touch electrode (TE2) different from the first touch electrode (TE1). The first touch sensor metal (TSM1) may be electrically connected to the touch circuit (300) as the first touch line (TL1), and the second touch sensor metal (TSM2) may be electrically connected to the touch circuit (300) as the second touch line (TL2) different from the first touch line (TL1).

[0207] Referring to FIGS. 8 and 9, in the area where the first to fourth subpixels (SP1 to SP4) are arranged, one or more gate lines (SCL, SENL) may be arranged extending in the row direction. One or more gate lines (GL) may intersect the first touch sensor metal (TSM1) and the second touch sensor metal (TSM2) and may be arranged parallel to the first bridge wiring (BL1) and the second bridge wiring (BL2).

[0208] One or more gate lines (SCL, SENL) may include a scan signal line (SCL) connected to the gate node of the scan transistor (SCT) of FIG. 2 and a sense signal line (SENL) connected to the gate node of the sense transistor (SENT), and may be a single gate line (GL) in which the scan signal line (SCL) and the sense signal line (SENL) are integrated.

[0209] To be suitable for a lower light-emitting structure, the first touch sensor metal (TSM1) and the second touch sensor metal (TSM2) are located on the substrate (SUB), and may be located below the transistors (DRT, SCT, SENT) included in each of the first subpixel (SP1) and the second subpixel (SP2).

[0210] FIG. 10 is a drawing showing a first touch electrode (TE1), a first touch line (TL1), a second touch electrode (TE2) and a second touch line (TL2) in a touch display device (100) according to embodiments of the present invention.

[0211] Referring to FIG. 10, a plurality of subpixels (SP) disposed in an area where the first touch electrode (TE1) is configured may include first to fourth subpixels (SP1 to SP4), and a plurality of subpixels (SP) disposed in an area where the second touch electrode (TE2) is configured may include fifth to eighth subpixels (SP5 to SP8).

[0212] A first touch line (TL1) may be positioned passing through the respective areas of the first touch electrode (TE1) and the second touch electrode (TE1), and a second touch line (TL2) may be positioned passing through the respective areas of the first touch electrode (TE1) and the second touch electrode (TE1).

[0213] Each of the first touch electrode (TE1) and the second touch electrode (TE1) may be configured with first and second layer touch sensor metals (TSM_L1, TSM_L2) in a mesh form.

[0214] Each of the first touch line (TL1) and the second touch line (TL2) can be composed of one of the first and second layer touch sensor metals (TSM_L1, TSM_L2).

[0215] The first touch electrode (TE1) and the first touch line (TL1) can be connected through the first line contact hole (CNT_TL1), and the second touch electrode (TE2) and the second touch line (TL2) can be connected through the second line contact hole (CNT_TL2).

[0216] Among the first and second layer touch sensor metals (TSM_L1, TSM_L2) constituting the first touch electrode (TE1), the first touch sensor metal (TSM1) can also serve as the first touch line (TL1). Here, the first touch sensor metal (TSM1) may be the touch sensor metal (TSM_L1) located in the lower layer among the first and second layer touch sensor metals (TSM_L1, TSM_L2), or the touch sensor metal (TSM_L2) located in the upper layer.

[0217] Among the first and second layer touch sensor metals (TSM_L1, TSM_L2) constituting the second touch electrode (TE2), the second touch sensor metal (TSM2) can also serve as the second touch line (TL2). Here, the second touch sensor metal (TSM2) may be the touch sensor metal (TSM_L1) located in the lower layer among the first and second layer touch sensor metals (TSM_L1, TSM_L2), or the touch sensor metal (TSM_L2) located in the upper layer.

[0218] FIG. 11 is a diagram showing the planar structure of the area where the 8 subpixels (SP1~SP8) in FIG. 10 are arranged.

[0219] Referring to FIG. 11, first to fourth subpixels (SP1 to SP4) may be disposed in the area of ​​the first touch electrode (TE1). That is, the first touch electrode (TE1) may overlap with the first to fourth subpixels (SP1 to SP4).

[0220] The first subpixel (SP1) may include a first pixel electrode (PE1) and a first circuit region (CA1). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the first circuit region (CA1).

[0221] The second subpixel (SP2) may include a second pixel electrode (PE2) and a second circuit region (CA2). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the second circuit region (CA2).

[0222] The third subpixel (SP3) may include a third pixel electrode (PE3) and a third circuit region (CA3). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the third circuit region (CA3).

[0223] The fourth subpixel (SP4) may include a fourth pixel electrode (PE4) and a fourth circuit region (CA4). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the fourth circuit region (CA4).

[0224] Referring to FIG. 11, 5 to 8 subpixels (SP5 to SP8) may be disposed in the area of ​​the 2nd touch electrode (TE2).

[0225] They can be arranged in the order of the third subpixel (SP3), the first subpixel (SP1), the second subpixel (SP2), and the fourth subpixel (SP4).

[0226] The fifth subpixel (SP5) may include a fifth pixel electrode (PE5) and a fifth circuit region (CA5). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the fifth circuit region (CA5).

[0227] The sixth subpixel (SP6) may include a sixth pixel electrode (PE6) and a sixth circuit region (CA6). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the sixth circuit region (CA6).

[0228] The 7th subpixel (SP7) may include a 7th pixel electrode (PE7) and a 7th circuit region (CA7). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the 7th circuit region (CA3).

[0229] The 8th subpixel (SP8) may include an 8th pixel electrode (PE8) and an 8th circuit region (CA8). Three transistors (DRT, SCT, SENT) and one capacitor (Cst) may be formed in the 8th circuit region (CA8).

[0230] They can be arranged in the order of the 7th subpixel (SP7), 5th subpixel (SP5), 6th subpixel (SP6), and 8th subpixel (SP8).

[0231] A display panel (110) according to embodiments of the present invention may include first and third data lines (DL1, DL3) positioned between a first subpixel (SP1) and a third subpixel (SP3) and extended in a column direction, and second and fourth data lines (DL3, DL4) positioned between a second subpixel (SP2) and a fourth subpixel (SP4) and extended in a column direction.

[0232] The third data line (DL3) can supply a third data voltage (Vdata3) to the third subpixel (SP3), the first data line (DL1) can supply a first data voltage (Vdata1) to the first subpixel (SP1), the second data line (DL2) can supply a second data voltage (Vdata2) to the second subpixel (SP2), and the fourth data line (DL4) can supply a fourth data voltage (Vdata4) to the fourth subpixel (SP4).

[0233] A display panel (110) according to embodiments of the present invention may include a first power line (VL1) located to the left of a first subpixel (SP1) and extending in a column direction, a second power line (VL2) positioned to the right of a second subpixel (SP2) and extending in a column direction, and a third power line (VL3) located between the first subpixel (SP1) and the second subpixel (SP2) and extending in a column direction.

[0234] The first power line (VL1) can be located on one side (left) of the third subpixel (SP3) and the seventh subpixel (SP7).

[0235] The second power line (VL2) can be located on the other side (right side) of the fourth subpixel (SP4) and the eighth subpixel (SP8).

[0236] The third power line (VL3) is located between the first subpixel (SP1) and the second subpixel (SP2), and can be located between the fifth subpixel (SP5) and the sixth subpixel (SP6).

[0237] The first power line (VL1) and the second power line (VL2) are driving voltage lines (DLV), and the third power line (VL3) may be a reference voltage line (RVL).

[0238] Alternatively, the first power line (VL1) and the second power line (VL2) may be reference voltage lines (RVL), and the third power line (VL3) may be a driving voltage line (DLV).

[0239] A display panel (110) according to embodiments of the present invention may further include a first bridge wiring (BL1) connected to a first power line (VL1), a second bridge wiring (BL2) connected to a second power line (VL2), and a third bridge wiring (BL3) electrically connected to a third power line (VL3) and extending in a row direction.

[0240] A display panel (110) according to embodiments of the present invention may further include one or more first touch sensor metals (TSM1) that overlap with or are adjacent to a first power line (VL1), one or more second touch sensor metals (TSM2) that overlap with or are adjacent to a second power line (VL2), and one or more third touch sensor metals (TSM3) that overlap with or are adjacent to a third power line (VL3).

[0241] A display panel (100) according to embodiments of the present invention may further include a fourth touch sensor metal (TSM4) that is electrically connected to a third touch sensor metal (TSM3) and extends in a row direction.

[0242] Each of the first to third touch sensor metals (TSM1, TSM2, TSM3) is a wiring arranged while extending in the column direction. The fourth touch sensor metal (TSM4) is a wiring arranged while extending in the row direction.

[0243] A fourth touch sensor metal (TSM4) disposed in the area of ​​the first touch electrode (TE1) can be connected to the first touch sensor metal (TSM1) and the first line contact hole (CNT_TL1).

[0244] The fourth touch sensor metal (TSM4) placed in the area of ​​the second touch electrode (TE2) can be connected to the third touch sensor metal (TSM3) and the second line contact hole (CNT_TL2).

[0245] The third touch sensor metal (TSM3) and the fourth touch sensor metal (TSM4), which are disposed in the area of ​​the first touch electrode (TE1), together with the first touch sensor metal (TSM1), constitute the first touch electrode (TE1). And, the first touch sensor metal (TSM1) serves as the first touch line (TL1).

[0246] The third touch sensor metal (TSM3) and the fourth touch sensor metal (TSM4), which are disposed in the area of ​​the second touch electrode (TE2), together with the second touch sensor metal (TSM2), constitute the second touch electrode (TE2). And, the second touch sensor metal (TSM2) serves as the second touch line (TL2).

[0247] FIG. 12 is a diagram showing the display-touch crosstalk (DTX: Display-Touch Crosstalk, hereinafter referred to as DTS) phenomenon when there is a first type of image data signal (Vdata) in a touch display device (100) according to embodiments of the present invention, and FIG. 13 is a diagram showing the DTX phenomenon when there is a second type of image data signal (Vdata) in a touch display device (100) according to embodiments of the present invention.

[0248] Referring to FIG. 12, when a touch driving signal (TDS) with a fluctuating voltage level is applied to any first touch electrode (TE) among a plurality of touch electrodes (TE), if the image data signal (Vdata) supplied to a first subpixel (SP) that overlaps with the first touch electrode (TE) is an image data signal (Vdata) having a first voltage value (V1), a first noise signal can be induced in which the pixel electrode (PE) within the first subpixel (SP) has a fluctuating voltage level with a first amplitude (ΔV1_PE) corresponding to the amplitude (ΔV_TDS) of the touch driving signal (TDS).

[0249] The first voltage value (V1) mentioned above may be a voltage value belonging to a voltage range for low grayscale expression. For example, the first voltage value (V1) may be a voltage value corresponding to a zero grayscale (g0) for expressing black. An image data signal (Vdata) having the first voltage value (V1) is referred to as a first type of image data signal.

[0250] Referring to FIG. 13, when a touch driving signal (TDS) with a fluctuating voltage level is applied to a first touch electrode (TE) among a plurality of touch electrodes (TE), if the image data signal (Vdata) supplied to the first subpixel (SP) is an image data signal (Vdata) having a second voltage value (V2) higher than the first voltage value (V1), a second noise signal with a fluctuating voltage level can be induced in the pixel electrode (PE) within the first subpixel (SP) with a second amplitude (V3_PE) smaller than the amplitude (ΔV_TDS) of the touch driving signal (TDS).

[0251] The second voltage value (V2) mentioned above is a voltage value that is relatively higher than the first voltage value (V1) and may be a voltage value that falls within the voltage range for high grayscale expression. For example, the second voltage value (V2) may be a voltage value corresponding to 255 grayscales (g255) for expressing white. However, it is not limited to this, and the first voltage value (V1) and the second voltage value (V2) may be voltage values ​​that differ relatively. An image data signal (Vdata) having the second voltage value (V2) is called a second type of image data signal.

[0252] Referring to FIG. 12, for example, when the first voltage value (V1) is a voltage value for black representation, and an image data signal (Vdata) having the first voltage value (V1) is applied to the first node (N1) of the driving transistor (DRT), the driving transistor (DRT) may be in a turned-off state. At this time, the pixel electrode (PE) of the light-emitting element (ED) in the first subpixel (SP) may be in an electrically nearly floating state.

[0253] Accordingly, when a touch driving signal (TDS) with a voltage level fluctuating with a predetermined amplitude (ΔV_TDS) is applied to a first touch electrode (TE) that overlaps with a first subpixel (SP1), the voltage fluctuation at the first touch electrode (TE) can be transmitted almost intact to the pixel electrode (PE). That is, a first noise signal can be induced in the pixel electrode (PE) within the first subpixel (SP), with a voltage level fluctuating with a first amplitude (ΔV1_PE) corresponding to the amplitude (ΔV_TDS) of the touch driving signal (TDS).

[0254] According to this, the voltage difference (ΔV) between the first touch electrode (TE) and the pixel electrode (PE) is zero, almost zero, or constant. As a result, no current (Idtx) flows from the first touch electrode (TE1) to the pixel electrode (PE), or only a small amount of current (Idtx) flows. That is, no charge (Charge) can move to the crosstalk coupling capacitor (Cdtx) formed between the first touch electrode (TE1) and the pixel electrode (PE), or only a small amount of charge can move.

[0255] Referring to FIG. 13, for example, when the second voltage value (V2) is a voltage value for white representation, if an image data signal (Vdata) having the second voltage value (V2) is applied to the first node (N1) of the driving transistor (DRT), the driving transistor (DRT) may be in a fully turned-on state. At this time, the pixel electrode (PE) of the light-emitting element (ED) in the first subpixel (SP) may form a first coupling capacitor (Ced) with the common electrode (CE) of the light-emitting element (ED), and may also form a second coupling capacitor (Cdrt) with the third node (N3) of the driving transistor (DRT).

[0256] Accordingly, when a touch driving signal (TDS) with a voltage level fluctuating with a predetermined amplitude (ΔV_TDS) is applied to a first touch electrode (TE) that overlaps with a first subpixel (SP1), the voltage fluctuation at the first touch electrode (TE) may not cause voltage fluctuation at the pixel electrode (PE) or may only occur to a limited and minute degree due to the first coupling capacitor (Ced) and the second coupling capacitor (Cdrt) at the pixel electrode (PE). That is, a second noise signal may be induced in the pixel electrode (PE) within the first subpixel (SP), with a voltage level fluctuating with a second amplitude (ΔV2_PE) that is smaller than the amplitude (ΔV_TDS) of the touch driving signal (TDS).

[0257] According to this, a large voltage difference (ΔV) can occur between the first touch electrode (TE) and the pixel electrode (PE). As a result, a fairly large current (Idtx) flows from the first touch electrode (TE1) to the pixel electrode (PE). That is, a relatively large amount of charge (Charge) can be transferred to the crosstalk coupling capacitor (Cdtx) formed between the first touch electrode (TE1) and the pixel electrode (PE).

[0258] As described above, depending on the magnitude of the image data signal (Vdata) for the display, a difference in the amount of charge transferred to the crosstalk capacitor (Cdtx) during touch driving may occur. This difference in the amount of transferred charge may cause an unwanted deviation in the capacitance for touch sensing at the first touch electrode (TE). Consequently, touch sensitivity may be reduced or touch sensing errors may occur.

[0259] Accordingly, embodiments of the present invention present a "DTX compensation method" capable of preventing a decrease in touch sensitivity or touch sensing errors caused by DTX deviations resulting from differences in magnitude (voltage value differences) of image data signals (Vdata) for a display. Below, the DTX compensation method according to the embodiments of the present invention is described in detail.

[0260] FIG. 14 is a diagram showing a system for DTX compensation of a touch display device (100) according to embodiments of the present invention. FIG. 15 is a diagram for explaining a DTX compensation method according to embodiments of the present invention.

[0261] Referring to FIG. 14, a touch display device (100) according to embodiments of the present invention may include a display panel (110) that includes a plurality of subpixels (SP) connected to a plurality of data lines (DL) and a plurality of gate lines (GL), each of the plurality of subpixels (SP) including a light-emitting element (ED) and a driving transistor (DRT), and a plurality of touch electrodes (TE); a data driving circuit (120) that outputs an image data signal (Vdata) to a data line (DL); and a touch driving circuit (310) that senses at least one of the plurality of touch electrodes (TE) to generate sensing data (SEN_DATA) and outputs the sensing data (SEN_DATA).

[0262] Referring to FIG. 14, a touch display device (100) according to embodiments of the present invention may include a touch controller (320), etc., which calculates touch coordinates based on compensation sensing data (COMP_SEN_DATA) in which sensing data (SEN_DATA) is changed according to an image data signal (Vdata) for DTX compensation.

[0263] DTX compensation refers to a method that can prevent touch sensitivity degradation or touch sensing errors caused by DTX deviation due to a difference in magnitude (voltage value difference) of the image data signal (Vdata) for the display, and may mean changing the sensing data (SEN_DATA) into the compensated sensing data (COMP_SEN_DATA).

[0264] This DTX compensation is realized by the touch controller (320) calculating touch coordinates using the compensation sensing data (COMP_SEN_DATA) changed from the sensing data (SEN_DATA).

[0265] Depending on DTX compensation, the touch sensing compensation value corresponding to the difference between the compensated sensing data (COMP_SEN_DATA) and the sensing data (SEN_DATA) may vary depending on the voltage value (magnitude) of the image data signal (Vdata).

[0266] When the voltage value of the video data signal (Vdata) is the first voltage value (V1), the touch sensing compensation value may have the first touch sensing compensation value.

[0267] When the voltage value of the video data signal (Vdata) is a second voltage value (V2) different from the first voltage value (V1), the touch sensing compensation value may have a second touch sensing compensation value different from the first touch sensing compensation value.

[0268] The second voltage value (V2) mentioned above may be a grayscale voltage value that is relatively higher than the first voltage value (V1). Also, the second touch sensing compensation value may be a value greater than the first touch sensing compensation value.

[0269] The first voltage value (V1) mentioned above may be a voltage value belonging to a voltage range for low grayscale expression. For example, the first voltage value (V1) may be a voltage value corresponding to a zero grayscale (g0) for expressing black. An image data signal (Vdata) having the first voltage value (V1) is referred to as a first type of image data signal.

[0270] The second voltage value (V2) mentioned above is a voltage value that is relatively higher than the first voltage value (V1) and may be a voltage value that falls within the voltage range for high grayscale expression. For example, the second voltage value (V2) may be a voltage value corresponding to 255 grayscales (g255) for expressing white. However, it is not limited to this, and the first voltage value (V1) and the second voltage value (V2) may be voltage values ​​that differ relatively. An image data signal (Vdata) having the second voltage value (V2) is called a second type of image data signal.

[0271] Referring to FIG. 14, a touch display device (100) according to embodiments of the present invention may further include a crosstalk compensation unit (1400) that extracts or calculates and determines a crosstalk value corresponding to an image data signal (Vdata) for DTX compensation, and determines a touch sensing compensation value for sensing data (SEN_DATA) output from a touch driving circuit (310) based on the determined crosstalk value.

[0272] The crosstalk compensation unit (1400) can determine a touch sensing compensation value, then use the determined touch sensing compensation value to modify the sensing data (SEN_DATA) provided by the touch driving circuit (310) to generate compensation sensing data (COMP_SEN_DATA), and provide the generated compensation sensing data (COMP_SEN_DATA) to the touch controller (320).

[0273] The crosstalk compensation unit (1400) may be a separate circuit located outside the touch controller (320) or a circuit located inside the touch controller (320).

[0274] In some cases, the crosstalk compensation unit (1400) may be a component included inside the touch driving circuit (310). Alternatively, the crosstalk compensation unit (1400) may be a component included in the display controller (140).

[0275] The crosstalk compensation unit (1400) can perform a compensation function for the sensing data (SEN_DATA) in real time. To this end, the crosstalk compensation unit (1400) may need a function to analyze the image data signal (Vdata) in real time.

[0276] The crosstalk compensation unit (1400) may receive a video data signal (Vdata) from the data driving circuit (120) and analyze video data for display in real time, or receive digital video data from the display controller (140) and analyze video data for display in real time.

[0277] Alternatively, the crosstalk compensation unit (1400) may receive frame data from an external host system (150) and analyze video data for display in real time.

[0278] Referring to FIG. 14, a touch display device (100) according to embodiments of the present invention may store a lookup table (LUT) that stores crosstalk data in advance in memory for DTX compensation.

[0279] The crosstalk compensation unit (1400) can determine a crosstalk value corresponding to an image data signal (Vdata) by referring to crosstalk data stored in a lookup table (LUT).

[0280] For example, the crosstalk compensation unit (1400) can extract a crosstalk value corresponding to an image data signal (Vdata) from crosstalk data stored in a lookup table (LUT).

[0281] As another example, the crosstalk compensation unit (1400) can calculate a crosstalk value corresponding to an image data signal (Vdata) using crosstalk data stored in a lookup table (LUT).

[0282] The crosstalk compensation unit (1400) can determine the crosstalk value corresponding to the current image data signal (Vdata) by extracting the crosstalk value corresponding to the current image data signal (Vdata) from the lookup table (LUT).

[0283] Alternatively, the crosstalk compensation unit (1400) can determine the crosstalk value corresponding to the current image data signal (Vdata) by calculating the crosstalk value corresponding to the current image data signal (Vdata) according to a predetermined calculation method using crosstalk data stored in a lookup table (LUT).

[0284] The crosstalk compensation unit (1400) can determine a touch sensing compensation value (a change amount of sensing data (SEN_DATA)) corresponding to the determined crosstalk value.

[0285] Meanwhile, the crosstalk compensation unit (1400) can determine the crosstalk value according to the extraction method or calculation method by further considering not only the current image data signal (Vdata) itself, but also the subpixel (SP) to which the image data signal (Vdata) is supplied. That is, the crosstalk compensation unit (1400) can determine the crosstalk value corresponding to the image data signal (Vdata) and the subpixel (SP) to which the image data signal (Vdata) is supplied, according to the extraction method or calculation method by referring to the crosstalk data stored in the lookup table (LUT).

[0286] The crosstalk data stored in the lookup table (LUT) may include information about the magnitude of the DTX generated according to the image data signal (Vdata).

[0287] The crosstalk data stored in the lookup table (LUT) may include DTX size information that varies according to the magnitude (voltage value) of the image data signal (Vdata) described with reference to FIGS. 12 and 13. Here, the DTX size may represent the amount of charge transfer between the touch electrode (TE) and the pixel electrode (PE). Here, charge transfer makes capacitance-based touch detection at the touch electrode (TE) inaccurate or difficult. For example, the DTX size of one touch electrode (TE) may represent the noise magnitude at which one touch electrode (TE) is affected by the display drive (image data).

[0288] Meanwhile, DTX compensation refers to a method that can prevent touch sensitivity degradation or touch sensing errors caused by DTX deviation due to a difference in magnitude (voltage value difference) of the image data signal (Vdata) for the display, and may mean changing the sensing data (SEN_DATA) into the compensated sensing data (COMP_SEN_DATA).

[0289] Referring to FIG. 15, the DTX compensation may include a DTX compensation related to a touch electrode (TE) and a DTX compensation related to a touch line (TL).

[0290] Accordingly, the crosstalk data stored in the lookup table (LUT) may include crosstalk data for the touch electrode (TE) and crosstalk data for the touch line (TL) electrically connected to the touch electrode (TE). That is, the DTX size included in the crosstalk data stored in the lookup table (LUT) may include the DTX size related to the touch electrode (TE) and the DTX size related to the touch line (TL).

[0291] After the crosstalk value is determined according to the extraction method or calculation method by referring to the crosstalk data stored in the lookup table (LUT), the touch sensing compensation value (amount of change in sensing data (SEN_DATA)) determined based on the crosstalk value may include a DTX compensation value related to the touch electrode (TE) and a DTX compensation value related to the touch line (TL).

[0292] Each of the plurality of touch electrodes (TE) overlaps with the area of ​​two or more subpixels (SP), and the two or more subpixels (SP) may include subpixels (SP) to which an image data signal (Vdata) is supplied and which emit light of different colors.

[0293] The crosstalk data stored in the lookup table (LUT) may include crosstalk data for subpixels (SP) for each color.

[0294] As described above, for DTX compensation according to embodiments of the present invention, a lookup table (LUT) is configured by measuring the DTX size that occurs according to the size of image data for display. A touch display device (100) according to embodiments of the present invention can prevent touch sensitivity degradation and touch sensing errors by using the pre-configured lookup table (LUT) to calculate the DTX size caused by the touch electrode (TE) and touch line (TL) in real time, and by compensating the sensing data (SEN_DATA) obtained through touch sensing using the DTX size calculated in real time.

[0295] First, DTX compensation related to the touch electrode (TE) among the DTX compensation according to embodiments of the present invention will be explained with reference to FIGS. 16 to 18.

[0296] FIG. 16 is a diagram illustrating a method for compensating for DTX induced by a touch electrode (TE) during DTX compensation according to embodiments of the present invention, and a method for deriving weights for color-specific subpixels (SP) for this purpose; FIG. 17 is a diagram showing a DTX curve for compensating for DTX induced by a touch electrode (TE) during DTX compensation according to embodiments of the present invention; and FIG. 18 is a diagram illustrating a method for generating a lookup table (LUT) for a subpixel (SP) emitting red light to compensate for DTX induced by a touch electrode (TE) during DTX compensation according to embodiments of the present invention.

[0297] Referring to FIG. 16, the DTX size for each subpixel (SP) for the same image data may differ due to the size difference between subpixels (SP) and the size difference of the crosstalk coupling capacitor (Cdtx) between the pixel electrode (PE) and the touch electrode (TE) of each subpixel (SP).

[0298] Therefore, when the DTX size ratio for each subpixel (SP) is constant for each grayscale, one lookup table (LUT) for the touch electrode (TE) may be required. The crosstalk data included in the one lookup table (LUT) may be a value with a weight applied for each subpixel (SP).

[0299] A plurality of subpixels (SP) may include a red subpixel (R) that emits red light, a white subpixel (W) that emits white light, a blue subpixel (B) that emits blue light, and a green subpixel (G) that emits green light.

[0300] And, it is called one pixel (RWBG) including a red subpixel (R), a white subpixel (W), a blue subpixel (B), and a green subpixel (G).

[0301] The weight for the red subpixel (R) can be set to Wr, the weight for the white subpixel (W) can be set to Ww, the weight for the blue subpixel (B) can be set to Wb, and the weight for the green subpixel (G) can be set to Wg.

[0302] At this time, the weights (Wr, Ww, Wb, Wg) for the red subpixel (R), white subpixel (W), blue subpixel (B), and green subpixel (G) may be values ​​set according to the size (capacitance) of the crosstalk coupling capacitor (Cdtx) between the touch electrode (TE) and the size of the red subpixel (R), white subpixel (W), blue subpixel (B), and green subpixel (G), respectively.

[0303] Referring to FIG. 16, when the weight for the red subpixel (R) is set to Wr, the weight for the white subpixel (W) is set to Ww, the weight for the blue subpixel (B) is set to Wb, and the weight for the green subpixel (G) is set to Wg, the DTX (TE), which is the DTX size of one touch electrode (TE), is given by Equation 1 below. Here, the DTX (TE), which is the DTX size of one touch electrode (TE), may represent the noise size that one touch electrode (TE) is affected by due to display image data.

[0304]

[0305] DTX(TE), which is the DTX size of one touch electrode (TE), is the mean of the DTX size for the red subpixel (R) (DTX(R)), the DTX size for the white subpixel (W) (DTX(W)), the DTX size for the blue subpixel (B) (DTX(B)), and the DTX size for the green subpixel (G) (DTX(G)).

[0306] As shown in Equation 2 below, the DTX size (DTX(R)) for the red subpixel (R) is the value obtained by multiplying the DTX size (DTX(RWBG)) of the pixel (RWBG) by the corresponding weight (Wr), the DTX size (DTX(W)) for the white subpixel (W) is the value obtained by multiplying the DTX size (DTX(RWBG)) of the pixel (RWBG) by the corresponding weight (Ww), the DTX size (DTX(B)) for the blue subpixel (B) is the value obtained by multiplying the DTX size (DTX(RWBG)) of the pixel (RWBG) by the corresponding weight (Wb), and the DTX size for the green subpixel (G) is the value obtained by multiplying the DTX size (DTX(RWBG)) of the pixel (RWBG) by the corresponding weight (Wg).

[0307]

[0308] Referring to FIG. 17, the DTX curve representing the DTX size (DTX(RWBG)) of a pixel (RWBG) with respect to the grayscale (g0 to g255) can be determined from the DTX curve representing the DTX size (DTX(R)) of a red subpixel (R) with respect to the grayscale (g0 to g255), the DTX curve representing the DTX size (DTX(W)) of a white subpixel (W) with respect to the grayscale (g0 to g255), the DTX curve representing the DTX size (DTX(B)) of a blue subpixel (B) with respect to the grayscale (g0 to g255), and the DTX curve representing the DTX size (DTX(G)) of a green subpixel (G) with respect to the grayscale (g0 to g255).

[0309] Among the four color subpixels (R, W, B, G), the DTX size (DTX(W)) of the white subpixel (W) is the largest, the DTX size (DTX(B)) of the blue subpixel (B) is the next largest, the DTX size (DTX(R)) of the red subpixel (R) is the next largest, and the DTX size (DTX(W)) of the white subpixel (W) is the smallest.

[0310] And, the DTX size of the pixel (RWBG) (DTX(RWBG)) is the sum of the DTX size of the white subpixel (W) (DTX(W)), the DTX size of the blue subpixel (B) (DTX(B)), the DTX size of the red subpixel (R) (DTX(R)), and the DTX size of the white subpixel (W) (DTX(W)) by applying weights (Wr, Ww, Wb, Wg).

[0311] When the DTX size for the red subpixel (R), white subpixel (W), blue subpixel (B), and green subpixel (G) with weights (Wr, Ww, Wb, Wg) applied to the DTX (TE) of one touch electrode (TE), the DTX size of the pixel (RWBG) (DTX(RWBG)) and the sum of the weights (Wr+Ww+Wb+Wg) can be obtained as shown in Equation 3 below.

[0312]

[0313] When the DTX size ratio for each subpixel (SP) is not constant for each grayscale (Gray), a lookup table (LUT) may be required for each of the red subpixel (R), white subpixel (W), blue subpixel (B), and green subpixel (G). That is, four lookup tables (LUTs) may be required.

[0314] A lookup table (LUT) for each of the red subpixel (R), white subpixel (W), blue subpixel (B), and green subpixel (G) may include DTX size information (crosstalk data) for each of the red subpixel (R), white subpixel (W), blue subpixel (B), and green subpixel (G).

[0315] FIG. 18 is a diagram illustrating the process of generating a lookup table (LUT) for a red subpixel (R) among lookup tables (LUT) for each of a red subpixel (R), a white subpixel (W), a blue subpixel (B), and a green subpixel (G).

[0316] Referring to FIG. 18, a single touch electrode (TE) can be superimposed on subpixels (SP) arranged in M ​​rows and N columns. Image data is simultaneously input to each of the red subpixel (R), white subpixel (W), blue subpixel (B), and green subpixel (G) superimposed on the single touch electrode (TE), and a weighting ratio (Wr:Ww:Wb:Wg) can be calculated. Based on the sensing data (SEN_DATA) generated by the touch driving circuit (310) and the calculated weighting ratio (Wr:Ww:Wb:Wg), a lookup table (LUT) can be obtained.

[0317] Referring to FIG. 18, for example, image data corresponding to 255 grayscale (g255) is supplied to the red subpixel (R), and image data corresponding to zero grayscale (g0) is supplied to the white subpixel (W), blue subpixel (B), and green subpixel (G). Based on the sensing data (SEN_DATA) generated by the touch driving circuit (310) and the calculated weighting ratio (Wr:Ww:Wb:Wg), the DTX size associated with the red subpixel (R) is calculated, and a lookup table (LUT) for the red subpixel (R) including this can be obtained.

[0318] The sensing data (SEN_DATA) generated by the touch driving circuit (310) may be sensing data that is significantly affected by the red subpixel (SP).

[0319] As described above, after a lookup table (R) for a red subpixel (R) is provided, the crosstalk compensation unit (1400) can modify the sensing data (SEN_DATA) obtained from the touch driving circuit (310) using a lookup table (LUT) for a red subpixel (S) to generate compensation sensing data (COMP_SEN_DATA) and provide the touch controller (320).

[0320] When the lookup table (LUT) relates to one touch electrode (TE), the crosstalk compensation unit (1400) can perform average value processing to obtain the average DTX size (Mean[DTX(R)]) for all red subpixels (R) that overlap with one touch electrode (TE).

[0321] The crosstalk compensation unit (1400) can derive an average DTX size (Mean[DTX(R)]) by storing the DTX values ​​for N subpixels (SP) for each of the M subpixel rows, summing them all, and then dividing by N*M, which is the number of subpixels (SP) that overlap with one touch electrode (TE).

[0322] FIG. 19 is a diagram for explaining a method for compensating for DTX caused by a touch line (TL) during DTX compensation according to embodiments of the present invention, and FIG. 20 is a diagram for explaining a method for generating a lookup table (LUT) for a red subpixel (R) to compensate for DTX caused by a touch line (TL) during DTX compensation according to embodiments of the present invention.

[0323] In the example of FIGS. 8 to 10, where the third subpixel (SP) is a red subpixel (R) and the fourth subpixel (SP4) is a green subpixel (G), a first power line (VL1) is placed between the red subpixels (G1~Gn) and the red subpixels (R1~Rn) shown in FIG. 19, and one or more touch lines (TL) that overlap with or are adjacent to the first power line (VL1) may be placed.

[0324] The example in FIG. 19 is a case where three touch lines (TL1, TL2, TL3) are placed overlapping or adjacent to the first power line (VL1).

[0325] Referring to FIGS. 19 and 20, the crosstalk compensation unit (1400) generates a lookup table (LUT) regarding the DTX magnitude due to the influence of adjacent subpixels (green subpixels or red subpixels) for each of the three touch lines (TL1, TL2, TL3), and by referring to this, can ensure that the sensing data for the image data is affected by DTX.

[0326] Referring to FIG. 19, DTX size information related to the first touch line (TL1) due to the influence of green subpixels (G1~Gn) and DTX size information related to the third touch line (TL3) due to the influence of red subpixels (R1~Rn) can be defined by the same first DTX curve (DTX_A).

[0327] In contrast, DTX size information regarding the second touch line (TL2) due to the influence of both green subpixels (G1~Gn) and red subpixels (R1~Rn) can be defined by a second DTX curve (DTX_B) different from the first DTX curve (DTX_A).

[0328] Referring to FIGS. 19 and 20, the crosstalk compensation unit (1400) can finally calculate DTX size information (DTX(TL1)) related to the first touch line (TL1) as shown in Equation 4 below, by averaging the DTX sizes (DTX_A(G1)~DTX_A(Gn)) that the first touch line (TL1) receives from the display driving (image data) of each of the green subpixels (G1~Gn) immediately adjacent to the first touch line (TL1).

[0329]

[0330] Accordingly, a lookup table (LUT) containing DTX size information associated with the first touch line (TL1) may include DTX size information that the first touch line (TL1) receives through the display drive (image data) of green subpixels (G1~Gn) immediately adjacent to the first touch line (TL1).

[0331] Referring to FIGS. 19 and 20, the crosstalk compensation unit (1400) can finally calculate DTX size information (DTX(TL3)) related to the third touch line (TL3) as shown in Equation 5 below, by averaging the DTX sizes (DTX_A(R1)~DTX_A(Rn)) that the third touch line (TL3) receives from each of the red subpixels (R1~Rn) immediately adjacent to the third touch line (TL3) by display driving (image data).

[0332]

[0333] Accordingly, the lookup table (LUT) associated with the third touch line (TL3) may include DTX size information that the third touch line (TL3) receives from the display drive (image data) of the red subpixels (R1~Rn) immediately adjacent to the third touch line (TL3).

[0334] Referring to FIGS. 19 and 20, since the second touch line (TL2) is located between the first touch line (TL1) and the third touch line (TL3), it can be affected by both the green subpixels (G1~Gn) and the red subpixels (R1~Rn).

[0335] Referring to FIGS. 19 and 20, the crosstalk compensation unit (1400) can finally calculate DTX size information (DTX(TL2)) related to the second touch line (TL2) as shown in Equation 6 below by averaging the DTX sizes (DTX_B(R1 & G1) ~ DTX_B(Rn & Gn)) that the second touch line (TL2) receives from the display driving (image data) of the green subpixels (G1~Gn) and red subpixels (R1~Rn) adjacent to the second touch line (TL2).

[0336]

[0337] Accordingly, a lookup table (LUT) containing TDX size information related to the second touch line (TL2) may include DTX size information related to the first touch line (TL1) (DTX size information received by the first touch line (TL1) by the display driving (image data) of green subpixels (G1~Gn)) and DTX size information related to the third touch line (TL3) calculated by reflecting DTX size information at a certain ratio (DTX size information received by the third touch line (TL3) by the display driving (image data) of red subpixels (R1~Rn).

[0338] In this way, since the TDX size information related to the second touch line (TL2) can be calculated from the DTX size information related to the first touch line (TL1) and the DTX size information related to the third touch line (TL3), the capacity of the memory storing the lookup table (LUT) can be reduced by one-third.

[0339] The average processing of the crosstalk compensation unit (1400) can apply the TDX value derived at the touch electrode unit level up to the touch sensing point. This is because, since the image data changes in real time, the TDX influence received by the touch electrodes (TE) and touch lines (TL) must also be updated at the touch electrode unit level.

[0340] Meanwhile, the touch display device (100) having a DTX compensation function according to the embodiments of the present invention described above may be a bottom emission type display as shown in FIG. 4. In this case, as shown in FIG. 4, a plurality of touch electrodes (TE) that may be composed of first and second layer touch sensor metals (TSM_L1, TSM_L2) may be located below the light-emitting element (ED).

[0341] Meanwhile, the touch display device (100) having a DTX compensation function according to the embodiments of the present invention described above may be a top emission type display. This case will be explained with reference to FIG. 21.

[0342] FIG. 21 is a cross-sectional view of a touch display device (100) including a touch sensor structure when the touch display device (100) according to embodiments of the present invention is an upper light-emitting display.

[0343] Referring to FIG. 21, when the touch display device (100) according to embodiments of the present invention is an upper light-emitting display, the touch display device (100) according to embodiments of the present invention may include an encapsulation layer (ENCAP) located on a light-emitting element (ED) and composed of a plurality of layers (PAS1, PCL, PAS2).

[0344] Referring to FIG. 21, when the touch display device (100) according to embodiments of the present invention is an upper light-emitting display, a plurality of touch electrodes (TE) that may be composed of first and second layer touch sensor metals (TSM_L1, TSM_L2) may be located on an encapsulation layer (ENCAP).

[0345] When the touch display device (100) according to the embodiments of the present invention is an upper light-emitting display, the panel cross-sectional structure is described in more detail as follows.

[0346] A driving transistor (DRT) at each subpixel (SP) within a display area (DA) is placed on a substrate (SUB). The driving transistor (DRT) includes a first node electrode (NE1) corresponding to a gate electrode, a second node electrode (NE2) corresponding to a source electrode or drain electrode, a third node electrode (NE3) corresponding to a drain electrode or source electrode, and a semiconductor layer (SEMI), etc.

[0347] The first node electrode (NE1) and the semiconductor layer (SEMI) can be overlapped with the gate insulating film (GI) in between. The second node electrode (NE2) is formed on the insulating layer (INS) and contacts one side of the semiconductor layer (SEMI), and the third node electrode (NE3) is formed on the insulating layer (INS) and contacts the other side of the semiconductor layer (SEMI).

[0348] The light-emitting element (ED) may include a pixel electrode (PE) corresponding to an anode electrode (or cathode electrode), a light-emitting layer (EL) formed on the pixel electrode (PE), and a common electrode (CE) corresponding to a cathode electrode (or anode electrode) formed on the light-emitting layer (EL).

[0349] The pixel electrode (PE) is electrically connected to the second node electrode (NE2) of the driving transistor (DRT) exposed through a pixel contact hole penetrating the planarization film (PLN).

[0350] The light-emitting layer (EL) is formed on the pixel electrode (PE) of the light-emitting region provided by the bank. The light-emitting layer (EL) is formed by stacking a hole-related layer, a light-emitting layer, and an electron-related layer in that order or in reverse order on the pixel electrode (PE). A common electrode (CE) is formed to face the pixel electrode (PE) with the light-emitting layer (EL) in between.

[0351] The encapsulation layer (ENCAP) blocks external moisture or oxygen from penetrating the light-emitting element (ED), which is vulnerable to external moisture or oxygen. This encapsulation layer (ENCAP) may consist of a single layer, but as shown in FIG. 8, it may consist of multiple layers (PAS1, PCL, PAS2).

[0352] For example, when the encapsulation layer (ENCAP) is composed of a plurality of layers (PAS1, PCL, PAS2), the encapsulation layer (ENCAP) may include one or more inorganic encapsulation layers (PAS1, PAS2) and one or more organic encapsulation layers (PCL). As a specific example, the encapsulation layer (ENCAP) may have a structure in which a first inorganic encapsulation layer (PAS1), an organic encapsulation layer (PCL), and a second inorganic encapsulation layer (PAS2) are stacked in sequence.

[0353] As described above, the display panel (110) may include a dam area.

[0354] The dam area may exist at the boundary between the marked area (DA) and the non-marked area (NDA), or in the vicinity of the boundary. For example, the dam area may be the area surrounding a point where the slope suddenly rises as it moves inward from the outer edge. Alternatively, the dam area may refer to the area surrounding a point where the slope of the encapsulation layer (ENCAP) suddenly becomes gentle or rises again as it moves down along the slope of the encapsulation layer (ENCAP).

[0355] One or more dams (DAM1, DAM2) located in the dam area may be placed between the touchpad (TP) and the display area (DA). One or more dams (DAM1, DAM2) may be composed of a dam forming pattern (DFP) containing the same material as the bank (BANK).

[0356] The dam area may be located only in the non-display area (NDA), or it may be mostly in the non-display area (NDA) but some parts may extend across the display area (DA).

[0357] One or more dams (DAM1, DAM2) may be formed in the dam area. For example, one or more dams (DAM1, DAM2) may include a primary dam (DAM1) closer to the display area (DA) and a secondary dam (DAM2) located relatively closer to the touchpad (TP).

[0358] One or more dams (DAM1, DAM2) placed in the dam area can prevent the liquid organic encapsulation layer (PCL) from collapsing in the direction of the non-display area (NDA) and encroaching upon the touch pad (TP), etc. when the liquid organic encapsulation layer (PCL) is deposited on the display area (DA).

[0359] The primary dam (DAM1) and / or secondary dam (DAM2) can be formed as a single-layer or multi-layer structure.

[0360] The primary dam (DAM1) and / or secondary dam (DAM2) can basically be made into a dam forming pattern (DFP). The dam forming pattern (DFP) can have a height greater than the touchpads (X-TP, Y-TP) placed on the touchpad portion (TPA).

[0361] The dam formation pattern (DFP) can be formed from the same material as the bank for separating subpixels (SP) in the display area (DA). In some cases, the dam formation pattern (DFP) can be formed from the same material as the spacer for maintaining interlayer spacing. In such cases, the dam formation pattern (DFP) can be formed simultaneously with the bank or spacer, and accordingly, the dam structure can be formed without additional mask processes or increased costs.

[0362] An organic bag layer (PCL) containing organic material may be located only on the inner side of the innermost primary dam (DAM1). Alternatively, an organic bag layer (PCL) containing organic material may be located on the upper side of at least the primary dam (DAM1) among the primary dam (DAM1) and the secondary dam (DAM2).

[0363] A touch buffer film (T-BUF) can be placed on the encapsulation layer (ENCAP).

[0364] The touch sensor structure can be formed on the encapsulation layer (ENCAP).

[0365] The first and second layer touch sensor metals (TSM_L1, TSM_L2) are located on different layers with an interlayer insulating film (ILD) in between, and the encapsulation layer (ENCAP) may be located on the touch buffer film (T-BUF).

[0366] The first and second layer touch sensor metals (TSM_L1, TSM_L2) constitute a touch electrode (TE), and one of the first and second layer touch sensor metals (TSM_L1, TSM_L2) may constitute a touch line (TL).

[0367] One of the first and second layer touch sensor metals (TSM_L1, TSM_L2) that acts as a touch line (TL) can come down along the slope (SLOPE) of the encapsulation layer (ENCAP) and pass through the dams (DAM1, DAM2) to be electrically connected to a touch pad (TP) located on the outer edge.

[0368] A touch buffer film (T-BUF) is positioned between a touch electrode (TE) and a common electrode (CE), and can be designed so that the distance between the touch electrode (TE) and the common electrode (CE) of the light-emitting element (ED) maintains a predetermined minimum distance (e.g., 5 μm). Accordingly, parasitic capacitance between the touch electrode (TE) and the common electrode (CE) can be reduced or prevented, thereby preventing a decrease in touch sensitivity caused by parasitic capacitance.

[0369] The touch sensor structure may be placed directly on the encapsulation layer (ENCAP) without a touch buffer layer (T-BUF).

[0370] FIG. 22 is a flowchart of a touch sensing method of a touch display device (100) according to embodiments of the present invention.

[0371] Referring to FIG. 22, a touch sensing method of a touch display device (100) according to embodiments of the present invention may include a step (S10) of sensing a touch electrode (TE) to generate sensing data (SEN_DATA), a step (S20) of confirming an image data signal (Vdata) that overlaps with the touch electrode (TE) and is supplied to a subpixel (SP) for display, and a step (S40) of calculating touch coordinates based on compensation sensing data (COMP_SEN_DATA) that changes the sensing data (SEN_DATA) according to the image data signal (Vdata).

[0372] Referring to FIG. 22, a touch sensing method of a touch display device (100) according to embodiments of the present invention may further include, after step S20, a step (S30) of determining a touch sensing compensation value according to the voltage value of an image data signal (Vdata) and generating compensation sensing data (COMP_SEN_DATA) from the sensing data (SEN_DATA) and the touch sensing compensation value.

[0373] When the voltage value of the video data signal (Vdata) is the first voltage value (V1), the touch sensing compensation value may have the first touch sensing compensation value.

[0374] When the voltage value of the video data signal (Vdata) is a second voltage value (V2) different from the first voltage value (V1), the touch sensing compensation value may have a second touch sensing compensation value different from the first touch sensing compensation value.

[0375] The second voltage value (V2) is a higher grayscale voltage value than the first voltage value (V1), and the second touch sensing compensation value may be a larger value than the first touch sensing compensation value.

[0376] The first voltage value (V1) mentioned above may be a voltage value belonging to a voltage range for low grayscale expression. For example, the first voltage value (V1) may be a voltage value corresponding to a zero grayscale (g0) for expressing black. An image data signal (Vdata) having the first voltage value (V1) is referred to as a first type of image data signal.

[0377] The second voltage value (V2) mentioned above is a voltage value that is relatively higher than the first voltage value (V1) and may be a voltage value that falls within the voltage range for high grayscale expression. For example, the second voltage value (V2) may be a voltage value corresponding to 255 grayscales (g255) for expressing white. However, it is not limited to this, and the first voltage value (V1) and the second voltage value (V2) may be voltage values ​​that differ relatively. An image data signal (Vdata) having the second voltage value (V2) is called a second type of image data signal.

[0378] In step S30, the touch display device (100) may determine a crosstalk value corresponding to an image data signal (Vdata) by referring to crosstalk data stored in a lookup table (LUT), and determine a touch sensing compensation value for the sensing data (SEN_DATA) generated in step S10 based on the crosstalk value.

[0379] In step S30, the touch display device (100) may determine by extracting or calculating a crosstalk value corresponding to the image data signal (Vdata) and the subpixel (SP) to which the image data signal (Vdata) is supplied, by referring to crosstalk data stored in a lookup table (LUT).

[0380] Each of the plurality of touch electrodes (TE) overlaps with the area of ​​two or more subpixels (SP), and the two or more subpixels (SP) include a subpixel (SP) to which an image data signal (Vdata) is supplied, and the crosstalk data stored in the lookup table (LUT) may include crosstalk data for the touch electrode (TE) and crosstalk data for a touch line (TL) electrically connected to the touch electrode (TE).

[0381] According to embodiments of the present invention, a self-emissive display type touch display device (100) with a built-in touch sensor and a touch sensing method can be provided.

[0382] According to embodiments of the present invention, a touch display device (100) and a touch sensing method can be provided to prevent touch sensitivity degradation and touch sensing errors that may be caused by a deviation in the size of image data for display.

[0383] According to embodiments of the present invention, a touch display device (100) and a touch sensing method can be provided to prevent touch sensitivity degradation and touch sensing errors caused by display-touch crosstalk deviations that occur according to the size deviation of image data for display.

[0384] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Furthermore, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and thus the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

Claim 1 A display panel comprising a plurality of subpixels connected to a plurality of data lines and a plurality of gate lines, wherein each of the plurality of subpixels comprises a light-emitting element and a driving transistor, and a plurality of touch electrodes; a data driving circuit that outputs an image data signal to the data lines; and a touch driving circuit that senses at least one of the plurality of touch electrodes to generate sensing data and outputs the sensing data. A touch display device comprising a touch controller that detects whether a touch is present or calculates touch coordinates based on compensation sensing data in which the sensing data is changed according to the image data signal, wherein a touch sensing compensation value corresponding to the difference between the compensation sensing data and the sensing data changes according to the voltage value of the image data signal, and when the voltage value of the image data signal is a first voltage value, the touch sensing compensation value has a first touch sensing compensation value, and when the voltage value of the image data signal is a second voltage value different from the first voltage value, the touch sensing compensation value has a second touch sensing compensation value different from the first touch sensing compensation value, wherein the second voltage value is a higher grayscale voltage value than the first voltage value, and the second touch sensing compensation value is a larger value than the first touch sensing compensation value. Claim 2 delete Claim 3 delete Claim 4 A touch display device according to claim 1, further comprising a lookup table in which crosstalk data is stored, and a crosstalk compensation unit that extracts or calculates and determines a crosstalk value corresponding to the image data signal by referring to the crosstalk data stored in the lookup table, and determines a touch sensing compensation value for the sensing data output from the touch driving circuit based on the crosstalk value. Claim 5 In claim 4, the crosstalk compensation unit refers to the crosstalk data stored in the lookup table to extract or calculate and determine the crosstalk value corresponding to the image data signal and the subpixel to which the image data signal is supplied. Claim 6 A touch display device according to claim 4, wherein each of the plurality of touch electrodes overlaps with the area of ​​two or more subpixels, and the two or more subpixels include a subpixel to which the image data signal is supplied, and the crosstalk data stored in the lookup table includes crosstalk data for the touch electrode and crosstalk data for a touch line electrically connected to the touch electrode. Claim 7 A touch display device according to claim 4, wherein each of the plurality of touch electrodes overlaps with the area of ​​two or more subpixels, and the two or more subpixels include subpixels to which the image data signal is supplied and which emit light of different colors, and the crosstalk data stored in the lookup table includes crosstalk data associated with the subpixels for each color. Claim 8 A touch display device according to claim 1, wherein when a touch driving signal having a fluctuating voltage level is applied to a first touch electrode among the plurality of touch electrodes, if the image data signal supplied to a first sub-pixel overlapping with the first touch electrode is an image data signal having a first voltage value, a signal having a fluctuating voltage level with a first amplitude corresponding to the amplitude of the touch driving signal is induced in the pixel electrode within the first sub-pixel, and if the image data signal supplied to the first sub-pixel is an image data signal having a second voltage value higher than the first voltage value, a signal having a fluctuating voltage level with a second amplitude smaller than the amplitude of the touch driving signal is induced in the pixel electrode within the first sub-pixel. Claim 9 In claim 1, the plurality of touch electrodes are located below the light-emitting element in a touch display device. Claim 10 A touch display device according to claim 1, further comprising an encapsulation layer located on the light-emitting element, wherein the plurality of touch electrodes are located on the encapsulation layer. Claim 11 A touch display device according to claim 1, wherein each of the plurality of touch electrodes comprises a plurality of touch sensor metals arranged in a mesh type and electrically connected, and one of the plurality of touch sensor metals extends outside the area of ​​the touch electrode and is connected to the touch driving circuit. Claim 12 A touch display device according to claim 1, wherein the plurality of touch electrodes includes a first touch electrode and a second touch electrode adjacent in a first direction, the first touch electrode is composed of a plurality of touch sensor metals arranged in a mesh type and electrically connected, the second touch electrode is composed of a plurality of touch sensor metals arranged in a mesh type and electrically connected, and one of the plurality of touch sensor metals constituting the first touch electrode extends as a touch line and is connected to the touch driving circuit across the second touch electrode. Claim 13 A touch display device comprises: a display panel including a plurality of subpixels connected to a plurality of data lines and a plurality of gate lines, wherein each of the plurality of subpixels includes a light-emitting element and a driving transistor, and a plurality of touch electrodes; a data driving circuit that outputs an image data signal to the data lines; and a touch driving circuit that senses at least one of the plurality of touch electrodes to generate sensing data and outputs the sensing data. The system includes a touch controller that detects the presence or absence of a touch or calculates touch coordinates based on compensation sensing data in which the sensing data is changed according to the image data signal, wherein the plurality of touch electrodes includes a first touch electrode and a second touch electrode adjacent in a first direction, wherein the first touch electrode is composed of a plurality of touch sensor metals arranged in a mesh type and electrically connected, and the second touch electrode is composed of a plurality of touch sensor metals arranged in a mesh type and electrically connected, and one of the plurality of touch sensor metals constituting the first touch electrode is extended as a touch line and connected to the touch driving circuit across the second touch electrode, and the first touch electrode overlaps with a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, wherein the first sub-pixel and the second sub-pixel are located between the third sub-pixel and the fourth sub-pixel, wherein the first sub-pixel is located adjacent to one side of the second sub-pixel, the third sub-pixel is located adjacent to one side of the first sub-pixel, and the fourth sub-pixel is located adjacent to the other side of the second sub-pixel. The touch display device further includes a first power line located on one side of the third subpixel, a second power line located on the other side of the fourth subpixel, and a third power line located between the first subpixel and the second subpixel, and a plurality of touch sensor metals constituting the first touch electrode,A touch display device comprising: a first touch sensor metal positioned overlapping with or adjacent to the first power line; a second touch sensor metal positioned overlapping with or adjacent to the second power line; one or more of a third touch sensor metal positioned overlapping with or adjacent to the third power line; and a fourth touch sensor metal electrically connected to the first touch sensor metal, the second touch sensor metal, and the third touch sensor metal. Claim 14 A touch display device according to claim 13, wherein the first touch sensor metal, the second touch sensor metal, the third touch sensor metal, and the fourth touch sensor metal are disposed on different layers. Claim 15 A touch sensing method for a touch display device comprising a plurality of subpixels connected to a plurality of data lines and a plurality of gate lines, and a plurality of touch electrodes, comprising: a step of sensing the touch electrodes to generate sensing data; a step of confirming an image data signal that overlaps with the touch electrodes and is supplied to a subpixel for display; a step of determining a touch sensing compensation value according to the voltage value of the image data signal and generating compensation sensing data from the sensing data and the touch sensing compensation value; and a step of detecting whether a touch is present or calculating touch coordinates based on the compensation sensing data, wherein when the voltage value of the image data signal is a first voltage value, the touch sensing compensation value has a first touch sensing compensation value, and when the voltage value of the image data signal is a second voltage value different from the first voltage value, the touch sensing compensation value has a second touch sensing compensation value different from the first touch sensing compensation value, wherein the second voltage value is a higher grayscale voltage value than the first voltage value, and the second touch sensing compensation value is a larger value than the first touch sensing compensation value. Claim 16 delete Claim 17 delete Claim 18 A touch sensing method according to claim 15, wherein in the step of generating the compensation sensing data, the touch display device extracts or calculates and determines a crosstalk value corresponding to the image data signal by referring to crosstalk data stored in a lookup table, and determines the touch sensing compensation value for the sensing data based on the crosstalk value. Claim 19 A touch sensing method according to claim 18, wherein in the step of generating the compensation sensing data, the touch display device extracts or calculates and determines the crosstalk value corresponding to the image data signal and the subpixel to which the image data signal is supplied by referring to the crosstalk data stored in the lookup table. Claim 20 A touch sensing method according to claim 18, wherein each of the plurality of touch electrodes overlaps with the area of ​​two or more subpixels, and the two or more subpixels include a subpixel to which the image data signal is supplied, and the crosstalk data stored in the lookup table includes crosstalk data for the touch electrodes and crosstalk data for a touch line electrically connected to the touch electrodes.

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