Touch display device and touch driving method

Abstract

A touch display device and a touch driving method are provided. The touch display device includes: a display panel in which a plurality of sub-pixels are disposed in a display area and first and second dummy signal lines are disposed in a non-display area; a gate driving circuit configured to supply gate signals to the display panel using a plurality of gate clocks; a touch circuit configured to supply a plurality of touch driving signals to touch electrodes disposed on the display panel, and detect touch coordinates by receiving touch sensing signals; a timing controller configured to control the gate driving circuit and the touch circuit; and a dummy signal control circuit configured to control paths of the first dummy signal and the second dummy signal supplied to the first dummy signal line and the second dummy signal line.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2023-0157204, filed on November 14, 2023, which is hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0003] Embodiments of the present disclosure relate to a touch display device and a touch driving method, and more particularly, to a touch display device and a touch driving method capable of effectively reducing electromagnetic noise. Background Art

[0004] Representative display devices for displaying images based on digital data include liquid crystal display (LCD) devices using liquid crystals and organic light emitting display devices using organic light emitting diodes (OLEDs).

[0005] Among these display devices, organic light emitting display devices use light emitting diodes that emit light by themselves, so that they have advantages in fast response speed, contrast, light emitting efficiency, brightness and viewing angle. In this case, the light emitting diodes can be implemented as inorganic materials or organic materials.

[0006] The organic light emitting display device may include a light emitting diode disposed in each of a plurality of sub-pixels arranged on a display panel, and may control the brightness represented by the sub-pixel and display an image by controlling a voltage flowing through the light emitting diode and thereby emitting light in each light emitting diode.

[0007] In order to provide more diverse functions, these display devices may provide a function for recognizing a touch of a user's finger or a pen on a display panel and performing input processing based on the recognized touch.

[0008] As an example, a touch display device capable of touch recognition may include a plurality of touch electrodes disposed or embedded in a display panel, and the touch electrodes may be driven to detect the presence and touch coordinates of a user's touch on the display panel.

[0009] The touch display device may include signal lines that transmit various signals, and electromagnetic noise may be generated inside and outside the touch display device by the signals supplied to the signal lines.

[0010] Also, when electromagnetic noise is generated in the touch display device, a touch sensing operation may malfunction due to the electromagnetic noise, and image quality may be deteriorated.

[0011] Therefore, there is a need to reduce electromagnetic noise generated in a touch display device. Summary of the invention

[0012] Therefore, the inventors of the present disclosure have invented a touch display device and a touch driving method capable of reducing errors due to electromagnetic noise.

[0013] Embodiments of the present disclosure may provide a touch display device and a touch driving method capable of reducing electromagnetic noise and being driven with low power by forming a dummy gate clock line and a dummy touch line in a non-display area.

[0014] Furthermore, embodiments of the present disclosure may provide a touch display device and a touch driving method capable of increasing the efficiency of canceling electromagnetic noise by supplying a dummy gate signal to a dummy touch line in a touch processing period for processing a touch sensing signal.

[0015] An embodiment of the present disclosure may provide a touch display device, which includes: a display panel, in which a plurality of sub-pixels are arranged in a display area, and a first dummy signal line and a second dummy signal line are arranged in a non-display area; a gate drive circuit, which is configured to supply a gate signal to the display panel using a plurality of gate clocks; a touch circuit, which is configured to supply a plurality of touch drive signals to touch electrodes arranged on the display panel, and detect touch coordinates by receiving touch sensing signals; a timing controller, which is configured to control the gate drive circuit and the touch circuit; and a dummy signal control circuit, which is configured to control the paths of the first dummy signal and the second dummy signal supplied to the first dummy signal line and the second dummy signal line.

[0016] An embodiment of the present disclosure may provide a touch driving method, which includes: a step of supplying multiple touch driving signals to touch electrodes arranged on a display panel; a step of supplying a first dummy signal through a first dummy signal line arranged in a non-display area of ​​the display panel; a step of supplying a gate signal to the display panel using a plurality of gate clocks; a step of supplying a second dummy signal through a second dummy signal line arranged in the non-display area of ​​the display panel; and a step of controlling the paths of the first dummy signal and the second dummy signal.

[0017] According to the embodiments of the present disclosure, errors due to electromagnetic noise can be reduced.

[0018] According to an embodiment of the present disclosure, it is possible to reduce electromagnetic noise and drive with low power by forming a dummy gate clock line and a dummy touch line in a non-display area.

[0019] According to an embodiment of the present disclosure, the efficiency of canceling electromagnetic noise may be increased by supplying a dummy gate signal to a dummy touch line in a touch processing period for processing a touch sensing signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a view schematically showing a configuration of a touch display device according to an embodiment of the present disclosure;

[0022] Figure 2 A touch sensing system of a touch display device according to an embodiment of the present disclosure is shown;

[0023] Figure 3 is a diagram briefly showing a touch electrode structure for a touch sensing operation based on mutual capacitance in a touch display device according to an embodiment of the present disclosure;

[0024] Figure 4 is a view showing an example equivalent circuit of a sub-pixel constituting a display panel in a touch display device according to an embodiment of the present disclosure;

[0025] Figure 5 is a diagram showing a structure in which dummy touch electrode lines are arranged in a touch display device according to an embodiment of the present disclosure;

[0026] Figure 6 is a diagram showing waveforms of touch drive signals supplied to a plurality of touch electrode lines and dummy touch drive signals supplied to dummy touch electrode lines in a touch display device according to an embodiment of the present disclosure;

[0027] Figure 7 is a diagram showing an example of a display panel in which a gate driving circuit is implemented in a GIP type in a touch display device according to an embodiment of the present disclosure;

[0028] Figure 8 is a block diagram schematically showing a configuration of a GIP circuit in a touch display device according to an embodiment of the present disclosure;

[0029] Fig. 9 is a signal waveform showing a Q-node voltage of a shift register depending on a gate clock in a touch display device according to an embodiment of the present disclosure;

[0030] Fig.10 is a diagram showing an example of a dummy gate clock line formed along a non-display area in a touch display device according to an embodiment of the present disclosure;

[0031] Fig.11 is a diagram showing waveforms of a gate clock and a dummy gate clock in a touch display device according to an embodiment of the present disclosure;

[0032] Fig.12 is a timing diagram showing a display driving period and a touch driving period in a touch display device according to an embodiment of the present disclosure;

[0033] Fig.13 is a diagram showing a timing in which one display frame period in a touch display device according to an embodiment of the present disclosure is time-divided into a plurality of display driving periods and a plurality of touch driving periods;

[0034] Fig.14 shows the timing of supplying a pseudo touch drive signal and a pseudo gate clock in the case of a time-division drive operation in which a display drive period and a touch drive period are time-divided in a touch display device according to an embodiment of the present disclosure;

[0035] Fig.15 is a diagram showing a signal waveform of a dummy gate clock supplied through a dummy touch line during a touch processing period in a case of a time-division driving operation in which a display driving period and a touch driving period are temporally separated in a touch display device according to an embodiment of the present disclosure;

[0036] Fig.16 is a diagram showing a case where a display driving period and a touch driving period are performed simultaneously in a touch display device according to an embodiment of the present disclosure;

[0037] Fig.17 is a diagram showing a timing of supplying a pseudo touch driving signal and a pseudo gate clock when a display driving period and a touch driving period are performed simultaneously in a touch display device according to an embodiment of the present disclosure;

[0038] Fig.18 is a diagram showing a signal waveform of a dummy gate clock supplied through a dummy touch line during a touch processing period when a display driving period and a touch driving period are performed simultaneously in a touch display device according to an embodiment of the present disclosure;

[0039] Fig.19 is a block diagram showing a circuit for supplying a pseudo touch drive signal and a pseudo gate clock in a touch display device according to an embodiment of the present disclosure;

[0040] Fig. 20 and Fig.21 is a diagram showing a circuit of a first dummy signal generator and a second dummy signal generator in a touch display device according to an embodiment of the present disclosure; and

[0041] Fig. 22 is a plan view showing the arrangement of dummy lines in a touch display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. In the following description of the examples or embodiments of the present disclosure, reference will be made to the drawings, wherein specific examples or embodiments that can be implemented are shown by way of illustration, and wherein the same reference numerals and symbols can be used to specify the same or similar parts, even if they are shown in drawings that are different from each other. In addition, in the following description of the examples or embodiments of the present disclosure, when it is determined that the description may make the subject matter in some embodiments of the present disclosure quite unclear, the detailed description of the known functions and parts incorporated herein will be omitted. Terms such as "including", "having", "comprising", "constituting", "constituting by ... "and "formed by ... " used herein are generally intended to allow the addition of other components, unless these terms are used together with the term "only". As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise.

[0043] Terms such as "first", "second", "A", "B", "(A)" or "(B)" may be used herein to describe elements of the present disclosure. Each of these terms is not used to limit the nature, order, sequence or number of elements, etc., but is only used to distinguish the corresponding element from other elements.

[0044] When it is mentioned that a first element is “connected or coupled to” a second element, “contacts or overlaps” the second element, etc., it should be interpreted that not only the first element can be “directly connected or coupled to” the second element, or “directly contact or overlaps” the second element, but also a third element can be “inserted” between the first and second elements, or the first and second elements can be “connected or coupled to” each other, “contacts or overlaps” each other, etc. via a fourth element. Here, the second element can be included in at least one of the two or more elements that are “connected or coupled to” each other, “contacts or overlaps” each other, etc.

[0045] When time-related terms, such as "after", "afterwards", "next", "before", etc., are used to describe a process or operation of an element or configuration, or a process or step in an operation, process, or method of manufacture, these terms may be used to describe non-sequential or non-sequential processes or operations unless used with the terms "directly" or "immediately".

[0046] In addition, when referring to any dimension, relative size, etc., it should be considered that the numerical value or corresponding information (e.g., level, range, etc.) of the element or feature includes a tolerance or error range that may be caused by various factors (e.g., processing factors, internal or external influences, noise, etc.), even if no relevant description is specified. In addition, the term "may" fully includes all meanings of the term "can".

[0047] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0048] Figure 1 is a view schematically illustrating a configuration of a touch display device according to an embodiment of the present disclosure.

[0049] Reference Figure 1 , the touch display device 100 according to an embodiment of the present disclosure may include a display panel 110 , a data driving circuit 130 , a gate driving circuit 120 , and a timing controller 140 as components for displaying an image.

[0050] The display panel 110 may include a display area DA where an image is displayed and a non-display area NDA where an image is not displayed.

[0051] The non-display area NDA may be an outer area of ​​the display area DA and is referred to as a bezel area. The non-display area NDA may be an area visible from the front of the touch display device 100 or an area that is curved and not visible from the front of the touch display device 100.

[0052] The display panel 110 may include a plurality of sub-pixels SP. For example, the touch display device 100 may be various types of display devices including a liquid crystal display device, an organic light emitting display device, a micro light emitting diode (micro LED) display device, and a quantum dot display device.

[0053] The structure of each of the plurality of sub-pixels SP may vary according to the type of the touch display device 100. For example, when the touch display device 100 is a self-emissive display device in which the sub-pixels SP emit light by themselves, each sub-pixel SP may include a light-emitting element that emits light by itself, one or more transistors, and one or more capacitors.

[0054] The display panel 110 may further include various types of signal lines driving the plurality of sub-pixels SP. For example, the various types of signal lines may include a plurality of data lines DL transmitting data signals (also referred to as data voltages or image data) and a plurality of gate lines GL transmitting gate signals (also referred to as scan signals).

[0055] The plurality of data lines DL and the plurality of gate lines GL may cross each other. Each of the plurality of data lines DL may be disposed while extending in a column direction. Each of the plurality of gate lines GL may be disposed while extending in a row direction.

[0056] Here, the column direction and the row direction are relative. For example, the column direction may be a vertical direction, and the row direction may be a horizontal direction. As another example, the column direction may be a horizontal direction, and the row direction may be a vertical direction.

[0057] The data driving circuit 130 is a circuit for driving a plurality of data lines DL and may output data signals to the plurality of data lines DL. The gate driving circuit 120 is a circuit for driving a plurality of gate lines GL and may supply gate signals to the plurality of gate lines GL.

[0058] The timing controller 140 is a device for controlling the data driving circuit 130 and the gate driving circuit 120 , and may control the driving timing of the plurality of data lines DL and the driving timing of the plurality of gate lines GL.

[0059] The timing controller 140 may supply various types of data driving control signals DCS to the data driving circuit 130 to control the data driving circuit 130 , and may supply various types of gate driving control signals GCS to the gate driving circuit 120 to control the gate driving circuit 120 .

[0060] The data driving circuit 130 may supply data signals to the plurality of data lines DL according to the driving timing control of the timing controller 140. The data driving circuit 130 may receive digital image data DATA from the timing controller 140, and may convert the received image data DATA into analog data signals and output them to the plurality of data lines DL.

[0061] The gate driving circuit 120 may supply gate signals to the plurality of gate lines GL according to the timing control of the timing controller 140. The gate driving circuit 120 may receive a first gate voltage corresponding to an on-level voltage and a second gate voltage corresponding to an off-level voltage and various gate driving control signals GCS, generate gate signals, and supply the generated gate signals to the plurality of gate lines GL. The on-level voltage may be a high-level voltage, and the off-level voltage may be a low-level voltage. Conversely, the on-level voltage may be a low-level voltage, and the off-level voltage may be a high-level voltage.

[0062] At this time, the gate driving circuit 120 may include one or more gate driving integrated circuits (GDICs), and may be located only on one side or both sides of the display panel 110 according to a driving method. Alternatively, the gate driving circuit 120 may be implemented in the form of a gate in panel (GIP) directly formed in the non-display area NDA of the display panel 110.

[0063] To provide a touch sensing function as well as an image display function, the touch display device 100 may include a touch screen panel and a touch circuit 150 that senses the touch screen panel to detect whether a touch occurs by a touch object such as a finger or a pen, or detects a touched position.

[0064] The touch circuit 150 may include a touch driving circuit 152 that drives and senses the touch screen panel and generates and outputs touch sensing data, and a touch controller 154 that may detect occurrence of a touch or a touched position using the touch sensing data.

[0065] The touch screen panel may include a plurality of touch electrodes TE as touch sensors. The touch screen panel may also include a plurality of touch lines TL for electrically connecting the plurality of touch electrodes TE and the touch driving circuit 152. The touch screen panel or the touch electrodes TE are also referred to as touch sensors.

[0066] The touch screen panel may exist outside or inside the display panel 110. When the touch screen panel exists outside the display panel 110, the touch screen panel is called an external type touch screen panel. When the touch screen panel is an external type, the touch screen panel and the display panel 110 may be manufactured separately or may be combined. The external type touch screen panel may include a substrate and a plurality of touch electrodes TE on the substrate.

[0067] When the touch screen panel exists inside the display panel 110, the touch screen panel is referred to as an internal type touch screen panel. In the internal type touch screen panel, the touch screen panel may be formed in the display panel 110 during a manufacturing process of the display panel 110.

[0068] The touch driving circuit 152 may supply a touch driving signal to at least one of the plurality of touch electrodes TE, and detect a touch sensing signal transmitted from at least one touch electrode TE of the plurality of touch electrodes TE to generate touch sensing data.

[0069] The touch circuit 150 may perform touch sensing in a self-capacitance sensing scheme or a mutual capacitance sensing scheme.

[0070] When the touch circuit 150 performs touch sensing in a self-capacitance sensing scheme, the touch circuit 150 may perform touch sensing based on capacitance between each touch electrode TE and a touch object (eg, a finger or a pen).

[0071] When the touch circuit 150 performs touch sensing in a mutual capacitance sensing scheme, the touch circuit 150 may perform touch sensing based on capacitance between the touch electrodes TE.

[0072] According to the mutual capacitance sensing scheme, the plurality of touch electrodes TE are divided into driving touch electrodes and sensing touch electrodes. The touch driving circuit 152 may drive the driving touch electrodes by touch driving signals and may detect touch sensing signals from the sensing touch electrodes.

[0073] According to the self-capacitance sensing scheme, each of the plurality of touch electrodes TE may be used as a driving touch electrode and a sensing touch electrode. The touch driving circuit 152 may drive all or some of the plurality of touch electrodes TE and sense all or some of the plurality of touch electrodes TE.

[0074] The touch driving circuit 152 and the touch controller 154 may be implemented as separate devices or a single device.

[0075] Alternatively, the touch driving circuit 152 and the data driving circuit 130 may be implemented as separate integrated circuits. Alternatively, all or part of the touch driving circuit 152 and all or part of the data driving circuit 130 may be integrated into a single integrated circuit.

[0076] The touch display device 100 according to an embodiment of the present disclosure may be a self-luminous display device having a self-luminous element disposed on a display panel 110 , such as an organic light-emitting display device, a quantum dot display device, a micro LED display device, or the like.

[0077] Figure 2 A touch sensing system of a touch display device according to an embodiment of the present disclosure is shown.

[0078] Reference Figure 2 The touch display device 100 according to an embodiment of the present disclosure may be, for example, a display device that, in addition to providing a function of displaying an image, can also provide a function of sensing a touch of a passive stylus such as a finger, a conductive object, etc., and a function of sensing a touch of an active stylus such as a pen.

[0079] The touch display device 100 according to an embodiment of the present disclosure may be a display device in which a touch screen panel TSP including a plurality of touch electrodes TE as touch sensors is embedded in a display panel 110. For example, the touch display device 100 may be a television TV, a monitor, etc., or a mobile device such as a tablet computer, a smart phone, etc.

[0080] For example, the touch display device 100 may divide the common electrodes used in the display driving period into a plurality of groups and then use the divided plurality of groups as a plurality of touch electrodes TE.

[0081] In another example, the touch display device 100 may use the plurality of touch electrodes TE as touch sensing electrodes or touch driving electrodes.

[0082] The display panel 110 may be a liquid crystal display (LCD) panel, an organic light emitting diode (OLED) panel, or the like.

[0083] For example, when the display panel 110 is a liquid crystal display panel, the touch display device 100 may divide common electrodes to which a common voltage is applied and to form an electric field with pixel electrodes into a plurality of groups and then use the divided groups as corresponding touch electrodes TE.

[0084] In another example, when the display panel 110 is an organic light emitting diode (OLED) panel, the touch display device 100 may include an organic light emitting diode (OLED) composed of a first electrode, an organic light emitting layer, and a second electrode, an encapsulation layer located on the OLED and having an encapsulation function, and a touch sensor metal layer located on the encapsulation layer. Here, a plurality of touch electrodes may be formed on the touch sensor metal layer.

[0085] Hereinafter, for convenience of description and easy understanding, it is assumed that the plurality of touch electrodes TE are used as touch driving electrodes (touch sensors) in a process of touch driving, and are used as common electrodes in a process of display driving.

[0086] The touch display device 100 may include a touch circuit 150 that performs touch sensing and stylus sensing using a signal received through the display panel 110 by driving the display panel 110 in which the touch screen panel TSP is integrated.

[0087] The touch circuit 150 may include a first circuit for supplying a touch driving signal to the touch electrode TE and receiving a touch signal through the touch line TL, and a second circuit for detecting passive touch sensing (finger touch sensing) and active touch sensing using a touch signal received through the display panel 110 .

[0088] The first circuit may be referred to as a touch driving circuit 152 , and the second circuit may be referred to as a touch controller 154 .

[0089] The touch driving circuit 152 may be implemented as an integrated driving circuit together with the data driving circuit 130 for driving the data lines.

[0090] The touch driving circuit 152 may be implemented in a chip on film (COF) type mounted on a film.

[0091] The film on which the touch driving circuit 152 is mounted may be attached to a joining portion of the display panel 110 and a joining portion of a printed circuit board (PCB), respectively.

[0092] The touch controller 154 and the like may be mounted on a printed circuit board (PCB).

[0093] The touch driving circuit 152 and the data driving circuit 130 may be implemented as separate driving chips. The touch driving circuit 152 may be electrically connected to a plurality of touch electrodes TE included in the display panel 110 through a plurality of touch lines TL.

[0094] At this time, the touch driving circuit 152 may perform a touch sensing operation during a touch period divided temporally separately from the display driving period. In another example, the touch driving circuit 152 may perform a touch sensing process and a display driving process simultaneously.

[0095] Figure 3 is a diagram briefly illustrating a touch electrode structure for a touch sensing operation based on mutual capacitance in a touch display device according to an embodiment of the present disclosure.

[0096] Reference Figure 3 According to the touch display device 100 of the embodiment of the present disclosure, the touch electrode structure for the touch sensing operation based on mutual capacitance may include a plurality of X touch electrode lines X-TEL and a plurality of Y touch electrode lines Y-TEL. The plurality of X touch electrode lines X-TEL and the plurality of Y touch electrode lines Y-TEL are located on the encapsulation layer ENCAP, but the embodiment of the present disclosure is not limited thereto.

[0097] Each of the plurality of X touch electrode lines X-TEL may be disposed along a first direction, and each of the plurality of Y touch electrode lines Y-TEL may be disposed along a second direction different from the first direction.

[0098] In the present disclosure, the first direction and the second direction may be relatively different directions. For example, the first direction may be the x-axis direction, and the second direction may be the y-axis direction. Conversely, the first direction may be the y-axis direction, and the second direction may be the x-axis direction. The first direction and the second direction may be perpendicular to each other, or may not be perpendicular to each other. In the present disclosure, row and column are relative terms, and from a point of view, the terms "row" and "column" may be used interchangeably.

[0099] Each X touch electrode line X-TEL may be composed of a plurality of X touch electrodes electrically connected to one another. Each Y touch electrode line Y-TEL may be composed of a plurality of Y touch electrodes electrically connected to one another.

[0100] A plurality of X touch electrodes and a plurality of Y touch electrodes are included in the plurality of touch electrodes TE, and their roles (functions) are distinguished.

[0101] For example, the plurality of X touch electrodes respectively constituting the plurality of X touch electrode lines X-TEL may be driving touch electrodes, and the plurality of Y touch electrodes respectively constituting the plurality of Y touch electrode lines Y-TEL may be sensing touch electrodes. In this case, the plurality of X touch electrode lines X-TEL respectively correspond to driving touch electrode lines, and the plurality of Y touch electrode lines Y-TEL respectively correspond to sensing touch electrode lines.

[0102] On the contrary, the plurality of X touch electrodes respectively constituting the plurality of X touch electrode lines X-TEL may be sensing touch electrodes, and the plurality of Y touch electrodes respectively constituting the plurality of Y touch electrode lines Y-TEL may be driving touch electrodes. In this case, the plurality of X touch electrode lines X-TEL respectively correspond to sensing touch electrode lines, and the plurality of Y touch electrode lines Y-TEL respectively correspond to driving touch electrode lines.

[0103] The touch sensor metal for touch sensing may include a plurality of touch lines TL and a plurality of X touch electrode lines X-TEL and a plurality of Y touch electrode lines Y-TEL.

[0104] The plurality of touch lines TL may include one or more X touch lines X-TL respectively connected to the plurality of X touch electrode lines X-TEL and one or more Y touch lines Y-TL respectively connected to the plurality of Y touch electrode lines Y-TEL.

[0105] Figure 4 is a view showing an example equivalent circuit of a sub-pixel constituting a display panel in a touch display device according to an embodiment of the present disclosure.

[0106] Reference Figure 4 According to an embodiment of the present disclosure, each of the multiple sub-pixels SP in the touch display device 100 may include a light emitting element ED, a driving transistor DRT for driving the light emitting element ED, a switching transistor SWT for switching the electrical connection between the gate electrode of the driving transistor DRT and the data line DL, and a storage capacitor Cst electrically connected between the gate electrode of the driving transistor DRT and the source electrode or the drain electrode of the driving transistor DRT.

[0107] The gate electrode of the driving transistor DRT corresponds to the first node N1. The source electrode or the drain electrode of the driving transistor DRT corresponds to the second node N2. The drain electrode or the source electrode of the driving transistor DRT corresponds to the third node N3.

[0108] The light emitting element ED may include an anode electrode AE, a light emitting layer EL, and a cathode electrode CE. The light emitting layer EL may be located on the cathode electrode CE, and the anode electrode AE ​​may be located on the light emitting layer EL. For example, the light emitting element ED is a device for a self-luminous display, and may include an organic light emitting diode (OLED), a light emitting element formed of quantum dots, or a micro light emitting diode (micro LED).

[0109] The anode electrode AE ​​may be referred to as a pixel electrode, and the cathode electrode CE may be referred to as a common electrode.

[0110] The drain electrode or source electrode of the switching transistor SWT may be electrically connected to the data line DL. The source electrode or drain electrode of the switching transistor SWT may be electrically connected to the gate electrode of the driving transistor DRT at the first node N1. The gate electrode of the switching transistor SWT may be electrically connected to a scan signal line SCL, which is a type of the gate line GL. The on / off of the switching transistor SWT may be controlled by a scan signal SCAN supplied from the scan signal line SCL.

[0111] The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2. The storage capacitor Cst may be used to maintain a voltage difference between the first node N1 and the second node N2 for a predetermined period of time (e.g., one frame time). The storage capacitor Cst is not an internal capacitor (parasitic capacitor) of the driving transistor DRT, but an external capacitor intentionally designed to drive the sub-pixel SP.

[0112] It has been described above that each sub-pixel SP includes the light emitting element ED, two transistors DRT and SWT, and one capacitor Cst, but each sub-pixel SP may further include one or more transistors and, in some cases, one or more capacitors.

[0113] For example, Figure 4 As shown, each sub-pixel SP may further include a sensing transistor SENT for controlling a connection between the second node N2 and the reference voltage line RVL.

[0114] The drain electrode or source electrode of the sensing transistor SENT may be electrically connected to the reference voltage line RVL. The source electrode or drain electrode of the sensing transistor SENT may be electrically connected to the source electrode or drain electrode of the driving transistor DRT at the second node N2, and may also be electrically connected to the anode electrode AE. The gate electrode of the sensing transistor SENT may be electrically connected to a sensing signal line SENL, which is a type of the gate line GL. The on / off of the sensing transistor SENT may be controlled by a sensing signal SENSE supplied from the sensing signal line SENL.

[0115] The anode electrode AE ​​may be disposed in each of the plurality of sub-pixels SP and may be electrically connected to a source electrode or a drain electrode of the driving transistor DRT. In other words, at the second node N2, the anode electrode AE ​​may be electrically connected to a source electrode or a drain electrode of the driving transistor DRT.

[0116] The third node N3 of the driving transistor DRT may be electrically connected to a driving voltage line DVL supplying a high-level driving voltage EVDD, and may be a drain electrode or a source electrode.

[0117] At this time, the high-level driving voltage EVDD required for displaying an image may be supplied through the driving voltage line DVL during the display driving period. For example, the high-level driving voltage EVDD required for displaying an image may be 27V.

[0118] The driving transistor DRT may be turned on by a voltage difference between the first node N1 and the third node N3 , and may supply a driving current to the light emitting element ED.

[0119] The cathode electrode CE may be provided in common in the plurality of sub-pixels SP. A direct current (DC) level reference voltage EVSS having no voltage level variation may be applied to the cathode electrode CE. Here, the reference voltage EVSS may correspond to a common voltage commonly applied to the light emitting elements ED of all sub-pixels SP.

[0120] In the touch display device 100 according to an embodiment of the present disclosure, the display panel 110 may further include a plurality of reference voltage lines EVSL electrically connected to the cathode electrode CE.

[0121] When multiple reference voltage lines EVSL are used, the reference voltage EVSS can be uniformly supplied to the entire area of ​​the cathode electrode CE. When a large area cathode electrode CE is provided due to the large area display panel 110, the method of supplying the reference voltage EVSS using multiple reference voltage lines EVSL can have the effect of effectively supplying the reference voltage EVSS.

[0122] The touch driving circuit 152 may include one or more preamplifiers PRE-AMP. The preamplifier PRE-AMP may include a non-inverting input terminal IN to which the touch driving signal TDS is input, an inverting input terminal INR electrically connected to the touch electrode TE, an output terminal OUT to which an output signal is output, and a feedback capacitor Cfb connected between the non-inverting input terminal IN and the output terminal OUT.

[0123] The touch display device 100 according to an embodiment of the present disclosure can provide a touch display device and a display panel capable of simplifying a manufacturing process and reducing manufacturing costs by forming a partial area of ​​the touch electrode TE to overlap a partial area of ​​the anode electrode AE ​​at the top or bottom of the anode electrode AE.

[0124] Therefore, the inverting input terminal INR of the preamplifier PRE-AMP may be electrically connected to the touch electrode TE formed at a position overlapping a partial area of ​​the anode electrode AE ​​of the light emitting element ED.

[0125] The touch driving signal TDS applied to the non-inverting input terminal IN of the pre-amplifier PRE-AMP may be a signal in which a voltage level varies, and may have a predetermined frequency and amplitude.

[0126] When the user touches the screen with a finger or a pen, a capacitance Cf may be formed between the touch electrode TE and the finger or the pen. The capacitance Cf is called a finger capacitance Cf.

[0127] The touch display device 100 can be used in mobile devices such as smart phones and tablet PCs and car displays. In this case, the touch display device 100 can communicate with other devices using an antenna.

[0128] At this time, in the process of sending and receiving wireless signals in the high frequency band, due to electromagnetic interference to the touch drive signal sent through the touch electrode line TEL, the performance of sending and receiving wireless signals and the performance of touch sensing in the touch display device 100 that uses an antenna to perform wireless signals may be reduced.

[0129] In order to solve this problem, the touch display device 100 of the present disclosure may include dummy touch electrode lines disposed in the non-display area NDA, which can reduce electromagnetic noise caused by wireless signals and the like.

[0130] Figure 5 is a diagram showing a structure in which dummy touch electrode lines are arranged in a touch display device according to an embodiment of the present disclosure.

[0131] Reference Figure 5 The touch display device 100 according to an embodiment of the present disclosure may include a plurality of X touch electrode lines X-TEL and a plurality of Y touch electrode lines Y-TEL disposed in a display area DA of a display panel 110, and at least one dummy touch electrode line P-TEL disposed in a non-display area NDA.

[0132] Here, for convenience of explanation, the following case is shown: 16 X touch electrode lines X-TEL[1] to X-TEL

[16] supplying touch drive signals are arranged along a first direction in the display area DA, and dummy touch electrode lines P-TEL are arranged along a direction parallel to the X touch electrode lines X-TEL in the non-display area NDA.

[0133] Each of the 16 X touch electrode lines X-TEL[1] to X-TEL

[16] is electrically connected to the corresponding X touch pad X-TP through the X touch line X-TL. In other words, the X touch electrode X-TE disposed on the outermost side of the plurality of X touch electrodes X-TE included in the X touch electrode line X-TEL may be electrically connected to the corresponding X touch pad X-TP through the X touch line X-TL.

[0134] One or more pseudo touch electrode lines P-TEL may be arranged in the non-display area NDA in a direction parallel to the X touch electrode lines X-TEL[1] to X-TEL

[16] transmitting the touch drive signal. At this time, the pseudo touch electrode lines P-TEL may be electrically connected to the corresponding pseudo touch pads P-TP through the pseudo touch lines P-TL.

[0135] At this time, when a pseudo touch driving signal having a phase opposite to that of a touch driving signal supplied to the plurality of X touch electrode lines X-TEL[1] to X-TEL

[16] is applied to the pseudo touch electrode line P-TEL in the non-display area NDA, electromagnetic interference caused by the touch driving signal can be reduced.

[0136] At this time, one pseudo touch electrode line P-TEL can be connected to one pseudo touch line P-TL. On the other hand, by connecting a plurality of pseudo touch electrode lines P-TEL spaced a certain distance apart to one pseudo touch line P-TL, electromagnetic noise caused by wireless signals and the like can be effectively reduced.

[0137] Figure 6 is a diagram showing waveforms of touch drive signals supplied to a plurality of touch electrode lines and dummy touch drive signals supplied to dummy touch electrode lines in a touch display device according to an embodiment of the present disclosure.

[0138] Reference Figure 6 In the touch display device 100 according to the embodiment of the present disclosure, a plurality of X touch electrode lines X-TEL may be provided in the display area DA of the display panel 110. Here, an example in which 16 X touch electrode lines X-TEL[1] to X-TEL

[16] are arranged is shown.

[0139] When 16 X touch electrode lines X-TEL[1] to X-TEL

[16] are provided in the display area DA of the display panel 110, 16 pulse-type touch drive signals TDS1 to TDS16 may be supplied to each of the 16 X touch electrode lines X-TEL[1] to X-TEL

[16] at different times.

[0140] At this time, a pseudo touch driving signal P-TDS having a phase opposite to that of the touch driving signals TDS1 to TDS16 may be supplied to the pseudo touch electrode line P-TEL.

[0141] Here, as an example, the following case is shown: one pseudo touch line P-TL or one pseudo touch electrode line P-TEL corresponds to 16 X touch electrode lines X-TEL[1] to X-TEL

[16] . The number of pseudo touch lines P-TL or pseudo touch electrode lines P-TEL may be changed in various ways.

[0142] In this manner, when the pseudo touch drive signal P-TDS having a phase opposite to the touch drive signals TDS1 to TDS16 transmitted through the plurality of X touch electrode lines X-TEL[1] to X-TEL

[16] is transmitted through the pseudo touch electrode line P-TEL located in the non-display area NDA, electromagnetic noise caused by the touch drive signal can be reduced.

[0143] Figure 7 is a diagram showing an example of a display panel in which a gate driving circuit is implemented in a GIP type in a touch display device according to an embodiment of the present disclosure.

[0144] Reference Figure 7 , the touch display device 100 according to an embodiment of the present disclosure may include 2n gate lines GL( 1 ) to GL( 2n ) (where n is a natural number) disposed in the display area DA for displaying an image in the display panel 110 .

[0145] Here, the display area DA is an area for displaying an image by emitting a plurality of sub-pixels SP of corresponding colors of light, such as white sub-pixels, red sub-pixels, green sub-pixels, and blue sub-pixels. In addition, a plurality of dummy pixels that do not emit light due to no supply of a gate signal or a data voltage Vdata but have a load similar to that of the sub-pixels SP may be disposed in some positions of the display area DA.

[0146] In an embodiment of the present disclosure, a plurality of sub-pixel regions emitting light of corresponding colors and a region including virtual pixels that do not emit light may be referred to as a display area DA. Alternatively, it may be referred to as a pixel array including a plurality of sub-pixel regions emitting light of corresponding colors and a region where virtual pixels that do not emit light are set.

[0147] The gate driving circuit 120 may include 2n GIP circuits GIPC corresponding to the 2n gate lines GL( 1 ) to GL( 2n ), and may be disposed in a non-display area NDA excluding pixels in an outer area of ​​the display area DA.

[0148] Therefore, 2n GIP circuits GIPC can supply gate signals to 2n gate lines GL( 1 ) to GL( 2n ).

[0149] Therefore, when the gate driving circuit 120 is implemented in a GIP type, there is no need to form a separate integrated circuit having a gate driving function and bond it to the display panel 110. Therefore, the number of integrated circuits can be reduced and a process of connecting the integrated circuits to the display panel 110 can be omitted. The size of the non-display area NDA for bonding the integrated circuits in the display panel 110 can also be reduced.

[0150] The 2n GIP circuits GIPC may be represented as GIPC(1), GIPC(2), . . . , GIPC(2n) to distinguish them from each other and to identify the corresponding relationship between the 2n gate lines GL(1) to GL(2n).

[0151] Here, an example of setting 2n GIP circuits GIPC (1) to GIPC (2n) on both sides of the non-display area NDA is shown. For example, among the 2n GIP circuits GIPC (1) to GIPC (2n), the odd GIP circuits GIPC (1), GIPC (3), ..., GIPC (2n-1) can drive the odd gate lines GL (1), GL (3), ..., GL (2n-1). Among the 2n GIP circuits GIPC (1) to GIPC (2n), the even GIP circuits GIPC (2), GIPC (4), ..., GIPC (2n) can drive the even gate lines GL (2), GL (4), ..., GL (2n).

[0152] Alternatively, 2n GIP circuits GIPC( 1 ) to GIPC( 2 n ) may be provided only on one side of the non-display area NDA.

[0153] In a non-display area NDA including no pixels outside the display area DA of the display panel 110 , a plurality of gate clock signal lines GCL for sending gate clocks required to generate and output gate signals to the gate driving circuit 120 may be provided.

[0154] According to the circuit structure of the sub-pixel, the gate signal generated in the GIP circuit GIPC may include a scan signal, a sensing signal, or an emission signal.

[0155] Figure 8 is a block diagram schematically showing a configuration of a GIP circuit in a touch display device according to an embodiment of the present disclosure.

[0156] Reference Figure 8 According to an embodiment of the present disclosure, a GIP circuit GIPC in the touch display device 100 may include a shift register 122 and a buffer circuit 124 .

[0157] The GIP circuit GIPC starts operating according to the gate start pulse GSP, and outputs a gate signal GS according to the gate clock GCLK. The gate signal GS generated in the GIP circuit GIPC is sequentially shifted and supplied through the gate line GL.

[0158] The buffer circuit 124 has two nodes Q and QB important to the gate driving state, and may include a pull-up transistor TU and a pull-down transistor TD. The gate node of the pull-up transistor TU may correspond to the Q node, and the gate node of the pull-down transistor TD may correspond to the QB node.

[0159] The shift register 122 may also be referred to as a shift logic circuit, and may be used to generate a gate signal GS in synchronization with a gate clock GCLK.

[0160] The shift register 122 may control the Q node and the QB node connected to the buffer circuit 124 so that the buffer circuit 124 may output the gate signal GS, and to this end, may include a plurality of transistors.

[0161] The shift register 122 starts to generate the gate signal GS, and the output of the shift register 122 is sequentially turned on according to the gate clock GCLK. In other words, the logic state for sequentially determining the on / off of the gate line GL can be transmitted by controlling the output timing of the shift register 122 using the gate clock GCLK.

[0162] The corresponding voltage states of the Q node and the QB node of the buffer circuit 124 may be different according to the shift register 122. Therefore, the buffer circuit 124 may output a high-level gate voltage VGH for turning on the corresponding gate line GL to the corresponding gate line GL, or output a low-level gate voltage VGL for turning off the corresponding gate line GL to the corresponding gate line GL.

[0163] Meanwhile, one GIP circuit GIPC may further include a level shifter in addition to the shift register 122 and the buffer circuit 124 .

[0164] In this case, the shift register 122 and the buffer circuit 124 constituting the GIP circuit GIPC may be connected in various structures.

[0165] Fig. 9 is a signal waveform showing a Q-node voltage of a shift register depending on a gate clock in a touch display device according to an embodiment of the present disclosure.

[0166] Reference Fig. 9 In the GIP circuit GIPC of the touch display device 100 according to an embodiment of the present disclosure, when the first gate clock GCLK1 is supplied to the buffer circuit 124 in a state in which the Q node of the shift register 122 is charged with the high-level gate voltage VGH, the voltage of the floating Q node is bootstrapped, and the high-level gate voltage VGH of the pull-up transistor TU is further increased.

[0167] In this case, the first gate signal supplied from the buffer circuit 124 to the first gate line GL1 may be maintained at the same level as the first gate clock GCLK1 .

[0168] At this time, the voltage of the Q node further increases when the second gate clock GCLK2 is supplied to the adjacent buffer circuit 124. Therefore, the second gate signal supplied from the adjacent buffer circuit 124 to the second gate line may increase to a level higher than the Q node voltage of the previous stage.

[0169] In the case of an n-phase driving operation in which gate signals are sequentially supplied to n gate lines GL(1) to GL(n), the level of each gate signal supplied to the first gate line GL(1) to the nth gate line GL(n) may be a different value due to a voltage variation at the Q node.

[0170] Furthermore, capacitance may occur during conversion of the gate clocks GCLK1 to GCLKn transmitted through the gate clock lines GCL, and noise caused by electromagnetic interference may occur between adjacent gate lines GL.

[0171] In order to solve this problem, at least one dummy gate clock line may be provided in the non-display area NDA, and a dummy gate clock capable of reducing electromagnetic noise caused by the gate clock GCLK may be supplied.

[0172] Fig.10 is a diagram showing an example of a dummy gate clock line formed along a non-display area in a touch display device according to an embodiment of the present disclosure.

[0173] Reference Fig.10 , the gate driving circuit 120 that supplies a gate signal to the display panel 110 may be disposed outside the display area DA formed in the display panel 110 of the touch display device 100 according to an embodiment of the present disclosure.

[0174] A plurality of gate clock lines GCL that transmit a gate clock GCLK required to generate a gate signal to the gate driving circuit 120 may be disposed in a non-display area NDA where no pixels are formed in the display panel 110 .

[0175] In addition, a dummy gate clock line P-GCL may be disposed outside the gate clock line GCL to supply a dummy gate clock having a phase opposite to that of the gate clock GCLK.

[0176] The dummy gate clock line P-GCL may be arranged parallel to the gate clock line GCL along an outer side of the gate clock line GCL, and may form a closed loop connected along an upper side of the display panel 110 .

[0177] Therefore, when a dummy gate clock having a phase opposite to that of the gate clock GCLK is supplied along the dummy gate clock line P-GCL in a period in which the gate clock GCLK is supplied along the gate clock line GCL, electromagnetic noise caused by the gate clock GCLK may be reduced.

[0178] Fig.11 is a diagram showing waveforms of a gate clock and a dummy gate clock in a touch display device according to an embodiment of the present disclosure.

[0179] Here, it shows an example in which four gate clock lines GCL and one dummy gate clock line P-GCL are provided in the non-display area NDA.

[0180] Reference Fig.11 , the touch display device 100 according to an embodiment of the present disclosure may include a dummy gate clock line P-GCL disposed along an outer side of the gate clock line GCL located in the non-display area NDA.

[0181] When the gate clock GCLK is supplied through the gate clock line GCL during the display driving period, electromagnetic noise caused by the gate clock GCLK may be reduced by supplying the pseudo gate clock P-GCLK having a phase opposite to that of the gate clock GCLK to the pseudo gate clock line P-GCL.

[0182] For example, four gate clocks GCLK1 to GCLK4 supplied through four gate clock lines GCL may form pulses at different times. Therefore, a pseudo gate clock P-GCLK having a phase opposite to that of the four gate clocks GCLK1 to GCLK4 may be supplied through the pseudo gate clock line P-GCL.

[0183] Here, an example in which one pseudo gate clock P-GCLK corresponds to four gate clocks GCLK1 to GCLK4 is shown, and the number of pseudo gate clock lines P-GCL may be determined in various ways.

[0184] In this way, the touch display device 100 of the present disclosure can supply a pseudo touch drive signal having a phase opposite to that of the touch drive signal TDS through the pseudo touch line P-TL during the touch drive period in which the touch drive signal TDS is supplied. In addition, the touch display device 100 of the present disclosure can supply a pseudo gate clock P-GCLK having a phase opposite to that of the gate clock GCLK through the pseudo gate clock line P-GCL during the display drive period in which the gate clock GCLK is supplied. Therefore, the touch display device 100 of the present disclosure can reduce electromagnetic noise caused by the touch drive signal TDS and the gate clock GCLK.

[0185] Fig.12 is a timing diagram showing a display driving period and a touch driving period in a touch display device according to an embodiment of the present disclosure.

[0186] Reference Fig.12 According to an embodiment of the present disclosure, the touch display device 100 may perform a display driving operation for image display during a predetermined display driving period DP, and may perform a touch driving operation for sensing a touch input of a finger or a stylus during a predetermined touch driving period TP.

[0187] The display driving period DP and the touch driving period TP may be identical in time or overlap each other, or be separate periods in time.

[0188] When the display driving period DP and the touch driving period TP are identical in time, the display driving operation and the touch driving operation may be simultaneously performed.

[0189] Here, a case of a time-division driving operation in which the display driving period DP and the touch driving period TP are separated in time is shown. In this case, the display driving period DP and the touch driving period TP may be alternated.

[0190] Therefore, when the display driving period DP and the touch driving period TP are temporally separated while alternating, the touch driving period TP may correspond to a blank period in which the display driving is not performed.

[0191] The touch display device 100 may generate a touch synchronization signal Tsync that swings to a high level and a low level, thereby identifying or controlling the display driving period DP and the touch driving period TP. In other words, the touch synchronization signal Tsync may be a timing control signal that defines the touch driving period TP.

[0192] For example, a high level period (or low level period) of the touch synchronization signal Tsync may correspond to the display driving period DP, and a low level period (or high level period) of the touch synchronization signal Tsync may correspond to the touch driving period TP.

[0193] Regarding a scheme of allocating a display driving period DP and a touch driving period TP within one display frame period, one display frame period may be divided into one display driving period DP and one touch driving period TP, and a display driving operation may be performed during one display driving period DP, and a touch driving operation for sensing touch input of a passive stylus and an active stylus may be performed during one touch driving period TP corresponding to a blank period Blank.

[0194] As another example, one display frame period may be divided into two or more display drive periods DP and two or more touch drive periods TP. A display drive operation may be performed during two or more display drive periods DP within one display frame period, and a touch drive operation for sensing one or two or more touch inputs of a passive stylus and an active stylus in the entire or partial screen may be performed during two or more touch drive periods TP.

[0195] Therefore, when one display frame period is divided into two or more display driving periods DP and two or more touch driving periods TP, and display driving and touch driving are performed, each of two or more blank periods corresponding to the two or more touch driving periods TP within one display frame period is called a long horizontal blank (LHB).

[0196] Therefore, two or more periods when touch sensing of a stylus or finger is performed within a display frame period may be referred to as LHB or touch drive period TP, and a touch drive operation performed during two or more LHBs within one display frame period may be referred to as “LHB drive operation”.

[0197] Fig.13 is a diagram showing a timing in which one display frame period in a touch display device according to an embodiment of the present disclosure is time-divided into a plurality of display driving periods and a plurality of touch driving periods.

[0198] Reference Fig.13 , one display frame period in the touch display device 100 according to an embodiment of the present disclosure may be time-divided into 16 display driving periods DP1 to DP16 and 16 touch driving periods TP1 to TP16.

[0199] In this case, the 16 touch driving periods TP1 to TP16 may correspond to the 16 LHB periods LHB1 to LHB16 .

[0200] The touch display device 100 according to an embodiment of the present disclosure may divide one display frame period into one or more display driving periods DP1 to DP16 and one or more touch driving periods TP1 to TP16 to alternately perform a display driving operation and a touch driving operation.

[0201] Alternatively, the touch display device 100 according to the embodiment of the present disclosure may perform the touch driving periods TP1 to TP16 independently of the display driving periods DP1 to DP16 .

[0202] Fig.14 A timing of supplying a pseudo touch driving signal and a pseudo gate clock in the case of a time-division driving operation in which a display driving period and a touch driving period are time-divided in a touch display device according to an embodiment of the present disclosure is shown.

[0203] Reference Fig.14 According to an embodiment of the present disclosure, the touch display device 100 may perform a display driving operation for displaying an image during a display driving period DP within one display frame, and perform a touch driving operation for sensing a touch input of a finger or the like during a touch driving period TP.

[0204] The display driving period DP may be distinguished from the touch driving period TP by the touch synchronization signal Tsync.

[0205] The touch circuit 150 may supply a touch drive signal TDS to the touch electrode line TEL through the touch line TL during the touch drive period TP, and receive a touch sensing signal from the touch electrode line TEL. This period may be referred to as a touch sensing period. At this time, a pseudo touch drive signal P-TDS having a phase opposite to that of the touch drive signal TDS may be supplied through the pseudo touch line P-TL.

[0206] The touch circuit 150 may perform a touch processing operation by extracting touch coordinates by calculating the touch sensing signal received from the touch electrode line TEL, and sending the touch coordinates to the timing controller 140. This period may be referred to as a touch processing period. At this time, the touch processing period may be included in the display driving period DP after the touch driving period TP. Therefore, during the touch processing period, the touch driving signal TDS and the pseudo touch driving signal P-TDS are not supplied to the touch electrode line TEL.

[0207] That is, since the pseudo touch drive signal P-TDS is not supplied during the touch processing period when a touch processing operation occurs within the display driving period DP, electromagnetic noise can be reduced by relying only on the pseudo gate clock P-GCLK transmitted through the pseudo gate clock line P-GCL.

[0208] However, since the number of signal lines placed in the non-display area NDA must be reduced in order to achieve a narrow bezel, the number of dummy gate clock lines P-GCL is limited.

[0209] Therefore, it may be difficult to reduce electromagnetic noise generated during the display driving period DP by relying only on the dummy gate clock P-GCLK supplied through the dummy gate clock line P-GCL.

[0210] The touch display device 100 of the present disclosure can increase the reduction amount of electromagnetic noise generated during the display driving period DP by supplying the pseudo gate clock P-GCLK through the pseudo touch line P-TL during the touch processing period when a touch processing operation is performed within the display driving period DP.

[0211] Fig.15 is a diagram showing a signal waveform of a dummy gate clock supplied through a dummy touch line during a touch processing period in the case of a time-division driving operation in which a display driving period and a touch driving period are temporally separated in a touch display device according to an embodiment of the present disclosure.

[0212] Reference Fig.15 , the touch display device 100 according to an embodiment of the present disclosure may perform a display driving operation for displaying an image during a display driving period DP within one display frame, and perform a touch driving operation for sensing a touch input of a finger during a touch driving period TP.

[0213] The display driving period DP may be distinguished from the touch driving period TP by the touch synchronization signal Tsync.

[0214] The touch circuit 150 may supply a touch drive signal TDS to the touch electrode line TEL through the touch line TL during the touch drive period TP, and receive a touch sensing signal from the touch electrode line TEL. This period may be referred to as a touch sensing period. At this time, a pseudo touch drive signal P-TDS having a phase opposite to that of the touch drive signal TDS may be supplied through the pseudo touch line P-TL.

[0215] The touch circuit 150 may perform a touch processing operation by extracting touch coordinates by calculating the touch sensing signal received from the touch electrode line TEL, and sending the touch coordinates to the timing controller 140. This period may be referred to as a touch processing period. At this time, the touch processing period may be included in the display driving period DP after the touch driving period TP. Therefore, during the touch processing period, the touch driving signal TDS is not supplied to the touch electrode line TEL.

[0216] However, the dummy gate clock P-GCLK supplied through the dummy gate clock line P-GCL may also be supplied to the dummy touch line P-TL during the touch processing period.

[0217] In this way, when the dummy gate clock P-GCLK is supplied not only to the dummy gate clock line P-GCL but also to the dummy touch line P-TL during the touch processing period within the display driving period DP, the reduction amount of electromagnetic noise during the display driving period DP can be increased.

[0218] The touch display device 100 of the present disclosure may be applied not only to a time-division driving operation in which a display driving period and a touch driving period are temporally separated, but also to a simultaneous driving operation in which a display driving period and a touch driving period are performed together.

[0219] Fig.16 is a diagram illustrating a case where a display driving period and a touch driving period are simultaneously performed in a touch display device according to an embodiment of the present disclosure.

[0220] Reference Fig.16 , the touch display device 100 according to the embodiment of the present disclosure may perform a display driving operation and a touch driving operation at different times, and may perform the display driving operation and the touch driving operation at the same time.

[0221] In this case, the display frame period may overlap with the touch frame period.

[0222] Therefore, the touch synchronization signal Tsync can only distinguish and indicate the touch driving period TP within the touch frame period. For example, 16 LHBs LHB1 to LHB16 can be one touch frame period. Here, the touch frame period can mean a period in which a touch of a finger or a stylus can be sensed once in the entire screen.

[0223] Here, it is shown that the touch driving operation is performed in the high level period of the touch synchronization signal Tsync, but the touch driving operation may be performed in the low level period of the touch synchronization signal Tsync.

[0224] In addition, in the touch driving periods LHB1 to LHB16 , a finger touch driving operation may be performed to sense a touch by a finger, or a pen touch driving operation may be performed to sense a touch by a stylus pen.

[0225] Fig.17 is a diagram showing timings of supplying a pseudo touch driving signal and a pseudo gate clock when a display driving period and a touch driving period are performed simultaneously in a touch display device according to an embodiment of the present disclosure.

[0226] Reference Fig.17In the touch display device 100 according to the embodiment of the present disclosure, the display frame period may overlap with the touch frame period. At this time, the display driving operation in the display frame period may be performed independently of the touch driving operation in the touch frame period.

[0227] The touch circuit 150 may supply a touch drive signal TDS to the touch electrode line TEL through the touch line TL during some LHBs within the touch frame period, and receive a touch sensing signal from the touch electrode line TEL. This period may be referred to as a touch sensing period. At this time, a pseudo touch drive signal P-TDS having a phase opposite to that of the touch drive signal TDS may be supplied through the pseudo touch line P-TL.

[0228] The touch circuit 150 may perform a touch processing operation by extracting touch coordinates by calculating the touch sensing signal received from the touch electrode line TEL, and sending the touch coordinates to the timing controller 140. This period may be referred to as a touch processing period. At this time, the touch processing period may be included in some LHBs within the touch frame period. Therefore, during the touch processing period, the touch drive signal TDS may not be supplied to the touch electrode line TEL and the pseudo touch drive signal P-TDS may not be supplied to the pseudo touch line P-TL.

[0229] That is, since the pseudo touch driving signal P-TDS is not supplied during the touch processing period within the touch frame period, electromagnetic noise can be reduced by relying only on the pseudo gate clock P-GCLK transmitted through the pseudo gate clock line P-GCL.

[0230] However, since the number of signal lines placed in the non-display area NDA must be reduced in order to achieve a narrow bezel, the number of dummy gate clock lines P-GCL is limited.

[0231] Therefore, it may be difficult to reduce electromagnetic noise generated during the touch frame period by relying only on the dummy gate clock P-GCLK supplied through the dummy gate clock line P-GCL.

[0232] The touch display device 100 of the present disclosure may increase the reduction amount of generated electromagnetic noise by supplying the pseudo gate clock P-GCLK through the pseudo touch line P-TL during a touch processing period within a touch frame period.

[0233] Fig.18 is a diagram showing a signal waveform of a dummy gate clock supplied through a dummy touch line during a touch processing period when a display driving period and a touch driving period are performed simultaneously in a touch display device according to an embodiment of the present disclosure.

[0234] Reference Fig.18In the touch display device 100 according to the embodiment of the present disclosure, the display frame period may overlap with the touch frame period. At this time, the display driving operation in the display frame period may be performed independently of the touch driving operation in the touch frame period.

[0235] The touch circuit 150 may supply a touch drive signal TDS to the touch electrode line TEL through the touch line TL during some LHBs within the touch frame period, and receive a touch sensing signal from the touch electrode line TEL. This period may be referred to as a touch sensing period. At this time, a pseudo touch drive signal P-TDS having a phase opposite to that of the touch drive signal TDS may be supplied through the pseudo touch line P-TL.

[0236] The touch circuit 150 may perform a touch processing operation by extracting touch coordinates by calculating the touch sensing signal received from the touch electrode line TEL and sending the touch coordinates to the timing controller 140. This period may be referred to as a touch processing period. At this time, the touch processing period may be included in some LHBs within the touch frame period.

[0237] In the touch processing period, the touch driving signal TDS is not supplied to the touch line TL. However, during the touch processing period, the dummy gate clock P-GCLK supplied through the dummy gate clock line P-GCL may also be supplied to the dummy touch line P-TL.

[0238] In this way, by supplying the dummy gate clock P-GCLK not only to the dummy gate clock line P-GCL but also to the dummy touch line P-TL during the touch processing period within the display driving period DP, the reduction amount of electromagnetic noise during the display driving period DP can be increased.

[0239] Fig.19 is a block diagram illustrating a circuit for supplying a pseudo touch driving signal and a pseudo gate clock in a touch display device according to an embodiment of the present disclosure.

[0240] Reference Fig.19 The touch display device 100 according to an embodiment of the present disclosure may include a touch driving circuit 152 , a first dummy signal generator 156 , a second dummy signal generator 158 , and a switch circuit 159 .

[0241] The touch driving circuit 152 provides a touch driving signal TDS to at least one touch electrode TE among a plurality of touch electrodes TE provided on the display panel 110 through a touch line TL.

[0242] In the case of a self-capacitance sensing scheme, the touch driving circuit 152 can supply a touch driving signal TDS and receive a touch sensing signal through the same touch line TL. On the other hand, in the case of a mutual capacitance sensing scheme, the touch driving circuit 152 can supply a touch driving signal TDS through a driving touch line and can receive a touch sensing signal through a sensing touch line.

[0243] The first pseudo signal generator 156 may receive the touch drive signal TDS generated from the touch drive circuit 152 and may generate a pseudo touch drive signal P-TDS having a phase opposite to that of the touch drive signal TDS. The pseudo touch drive signal P-TDS may be supplied to the switch circuit 159.

[0244] The second dummy signal generator 158 may receive the gate clock GCLK supplied from the timing controller 140, and may generate a dummy gate clock P-GCLK having a phase opposite to the gate clock GCLK. The dummy gate clock P-GCLK generated by the second dummy signal generator 158 may be supplied to the dummy gate clock line P-GCL and the switch circuit 159.

[0245] The switch circuit 159 may select a pseudo touch drive signal P-TDS or a pseudo gate clock P-GCLK according to a control signal and supply it to the pseudo touch line P-TL. The switch circuit 159 may supply the pseudo touch drive signal P-TDS to the pseudo touch line P-TL during a touch sensing period, and may supply the pseudo gate clock P-GCLK to the pseudo touch line P_TL during a touch processing period. The switch circuit 159 may be a multiplexer.

[0246] It can be said that this is a false signal control circuit including the first false signal generator 156 , the second false signal generator 158 , and the switch circuit 159 .

[0247] Here, as an example, a case is shown where the first false signal generator 156, the second false signal generator 158, and the switch circuit 159 are provided inside the touch circuit 150. However, the first false signal generator 156 may be provided inside the touch circuit 150, and the second false signal generator 158 and the switch circuit 159 may be provided outside the touch circuit 150.

[0248] Fig. 20 and Fig.21 is a diagram showing a circuit of a first dummy signal generator and a second dummy signal generator in a touch display device according to an embodiment of the present disclosure.

[0249] Reference Fig. 20In the touch display device 100 according to the embodiment of the present disclosure, the first pseudo signal generator 156 for generating the pseudo touch drive signal P-TDS may include a circuit in which an OR logic gate OR Gate is serially connected to an inverter Inverter.

[0250] The OR logic gate OR Gate can receive a plurality of touch drive signals TDS1, TDS2, TDS3, TDS4, ... having different input timings and transmit them sequentially. The inverter Inverter can invert each of the plurality of touch drive signals TDS1, TDS2, TDS3, TDS4, ... to generate a pseudo touch drive signal P-TDS.

[0251] Reference Fig.21 In the touch display device 100 according to the embodiment of the present disclosure, the second pseudo signal generator 158 for generating the pseudo gate clock P-GCLK may include a circuit in which an OR logic gate OR Gate is serially connected to an inverter Inverter.

[0252] The OR logic gate ORGate can receive a plurality of gate clocks GCLK1, GCLK2, GCLK3, GCLK4, ... having different input timings and can send them sequentially. The inverter Inverter can invert each of the plurality of gate clocks GCLK1, GCLK2, GCLK3, GCLK4, ... to generate a pseudo gate clock P-GCLK.

[0253] Meanwhile, the touch electrodes TE formed on the display panel 110 may cover a plurality of pixels. That is, since the number of touch electrodes TE is smaller than the number of pixels, the number of pseudo touch lines P-TL may also be smaller than the number of pseudo gate clock lines P-GCL.

[0254] Therefore, signal interference between dummy lines may be reduced by arranging the dummy touch line P-TL and the dummy gate clock line P-GCL.

[0255] Fig. 22 is a plan view showing the arrangement of dummy lines in a touch display device according to an embodiment of the present disclosure.

[0256] Reference Fig. 22 , the dummy lines in the touch display device 100 according to the embodiment of the present disclosure may be located in a non-display area where pixels do not emit light.

[0257] At this time, the first dummy gate clock line P- GCL1 and the second dummy gate clock line P- GCLK2 transmitting the dummy gate clock P- GCLK may be separately disposed outside the gate clock line GCL transmitting the gate clock GCLK.

[0258] The first pseudo gate clock line P-GCL1 is a line for transmitting a first pseudo gate clock having an opposite phase to the first gate clock in the gate clock GCLK. The second pseudo gate clock line P-GCL2 is a line for transmitting a second pseudo gate clock having an opposite phase to the second gate clock in the gate clock GCLK.

[0259] The first gate clock and the second gate clock may be signals that group a plurality of gate clocks. Alternatively, in the case of a sub-pixel using a scan signal and an emission signal, the first gate clock may be a scan clock, and the second gate clock may be an emission clock.

[0260] The dummy touch line P-TL may have a layer different from that of the dummy gate clock line P-GCL. However, they may be formed without overlapping each other to reduce signal interference between the dummy lines.

[0261] For the above purpose, a dummy touch line P-TL may be placed between the first dummy gate clock line P-GCL1 and the second dummy gate clock line P-GCL2.

[0262] When the first gate clock is a scan clock and the second gate clock is an emission clock, a pseudo scan clock line may be placed outside the gate clock line GCL, a pseudo touch line may be placed outside the pseudo scan clock line, and a pseudo emission clock line may be placed outside the pseudo touch line.

[0263] The embodiments of the present disclosure described above are briefly described below.

[0264] An embodiment of the present disclosure may provide a touch display device, which includes: a display panel, in which a plurality of sub-pixels are arranged in a display area, and a first dummy signal line and a second dummy signal line are arranged in a non-display area; a gate drive circuit, which is configured to supply a gate signal to the display panel using a plurality of gate clocks; a touch circuit, which is configured to supply a plurality of touch drive signals to touch electrodes arranged on the display panel, and detect touch coordinates by receiving touch sensing signals; a timing controller, which is configured to control the gate drive circuit and the touch circuit; and a dummy signal control circuit, which is configured to control the paths of the first dummy signal and the second dummy signal supplied to the first dummy signal line and the second dummy signal line.

[0265] The first dummy signal is a dummy touch driving signal having a phase opposite to the plurality of touch driving signals, wherein the second dummy signal is a dummy gate clock having a phase opposite to the plurality of gate clocks.

[0266] The pseudo signal control circuit includes: a first pseudo signal generator configured to generate a pseudo touch drive signal; a second pseudo signal generator configured to generate a pseudo gate clock and supply the pseudo gate clock to a second pseudo signal line; and a switch circuit configured to send a signal selected from the pseudo touch drive signal and the pseudo gate clock to the first pseudo signal line.

[0267] In a touch sensing period in which a plurality of touch drive signals are supplied to the touch electrodes, a pseudo touch drive signal is transmitted to the first pseudo signal line, and wherein in a touch processing period in which touch coordinates are calculated based on the touch sensing signals, a pseudo gate clock is transmitted to the first pseudo signal line.

[0268] The touch processing period is a period during which a plurality of touch driving signals are not supplied to the touch electrodes.

[0269] In a time-division driving operation in which a touch driving period and a display driving period are divided in time, wherein a touch sensing period is included in the touch driving period, and wherein a touch processing period is included in the display driving period.

[0270] The first pseudo signal generator includes an OR logic gate which receives a plurality of touch drive signals and sequentially transmits the plurality of touch drive signals; and an inverter which generates a pseudo touch drive signal by inverting each of the plurality of touch drive signals transmitted by the OR logic gate.

[0271] The second dummy signal generator includes an OR logic gate that receives a plurality of gate clocks and sequentially transmits the plurality of gate clocks; and an inverter that generates a dummy gate clock by inverting each of the plurality of gate clocks transmitted by the OR logic gate.

[0272] The false signal control circuit is implemented in the touch circuit.

[0273] Some of the second dummy signal lines are disposed outside a gate clock line that transmits a plurality of gate clocks, and other of the second dummy signal lines are disposed outside the first dummy signal line.

[0274] A portion of the second pseudo signal lines are lines that send pseudo scanning signals having a phase opposite to the scanning signal in the gate signal, and wherein other second pseudo signal lines are lines that send pseudo emission signals having a phase opposite to the emission signal in the gate signal.

[0275] An embodiment of the present disclosure may provide a touch driving method, which includes: a step of supplying multiple touch driving signals to touch electrodes arranged on a display panel; a step of supplying a first dummy signal through a first dummy signal line arranged in a non-display area of ​​the display panel; a step of supplying a gate signal to the display panel using a plurality of gate clocks; a step of supplying a second dummy signal through a second dummy signal line arranged in the non-display area of ​​the display panel; and a step of controlling the paths of the first dummy signal and the second dummy signal.

[0276] The above description has been presented to enable any person skilled in the art to implement and use the technical concept of the present disclosure, and the above description is provided in the context of a specific application and its requirements. Various modifications, additions and substitutions to the described embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. The above description and accompanying drawings provide examples of the technical concept of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical concept of the present disclosure.

Claims

1. A touch display device, comprising: a display panel in which a plurality of sub-pixels are disposed in a display region, and a first dummy signal line and a second dummy signal line are disposed in a non-display region; a gate driving circuit configured to supply a gate signal to the display panel using a plurality of gate clocks; a touch circuit configured to supply a plurality of touch drive signals to touch electrodes provided on the display panel and detect touch coordinates by receiving touch sensing signals; A timing controller, wherein the timing controller is configured to control the gate driving circuit and the touch circuit; as well as A dummy signal control circuit is configured to control paths of a first dummy signal and a second dummy signal supplied to the first dummy signal line and the second dummy signal line.

2. The touch display device according to claim 1, wherein: The first pseudo signal is a pseudo touch drive signal having a phase opposite to that of the plurality of touch drive signals, and The second pseudo signal is a pseudo gate clock having a phase opposite to that of the plurality of gate clocks.

3. The touch display device according to claim 2, wherein: The false signal control circuit comprises: a first false signal generator, the first false signal generator being configured to generate the false touch drive signal; a second dummy signal generator configured to generate the dummy gate clock and supply the dummy gate clock to the second dummy signal line; and A switch circuit is configured to send a signal selected from the pseudo touch drive signal and the pseudo gate clock to the first pseudo signal line.

4. The touch display device according to claim 2, wherein: In a touch sensing period in which the plurality of touch drive signals are supplied to the touch electrodes, the dummy touch drive signal is transmitted to the first dummy signal line, and In which, in a touch processing period in which touch coordinates are calculated according to the touch sensing signal, the pseudo gate clock is sent to the first pseudo signal line.

5. The touch display device according to claim 4, wherein: The touch processing period is a period during which the plurality of touch driving signals are not supplied to the touch electrodes.

6. The touch display device according to claim 4, in a time-division driving operation in which a touch driving period and a display driving period are divided in time, in, The touch sensing period is included in the touch driving period, and The touch processing period is included in the display driving period.

7. The touch display device according to claim 3, wherein: The first pseudo signal generator comprises: an OR logic gate that receives the plurality of touch drive signals and sequentially transmits the plurality of touch drive signals; and an inverter that generates the pseudo touch drive signal by inverting each of the plurality of touch drive signals transmitted by the OR logic gate.

8. The touch display device according to claim 3, wherein: The second pseudo signal generator comprises: an OR logic gate that receives the plurality of gate clocks and sequentially transmits the plurality of gate clocks; and An inverter generates the pseudo gate clock by inverting each of the plurality of gate clocks sent by the OR logic gate.

9. The touch display device according to claim 3, wherein: The false signal control circuit is implemented in the touch circuit.

10. The touch display device according to claim 1, wherein: A portion of the second dummy signal lines is disposed outside a gate clock line that transmits the plurality of gate clocks, and Other second dummy signal lines among the second dummy signal lines are arranged outside the first dummy signal line.

11. The touch display device according to claim 10, wherein: The part of the second dummy signal lines is a line that transmits a dummy scanning signal having a phase opposite to that of the scanning signal in the gate signal, and The other second dummy signal lines among the second dummy signal lines are lines that transmit dummy emission signals having a phase opposite to that of the emission signal among the gate signals.

12. A touch driving method, comprising: supplying a plurality of touch drive signals to touch electrodes disposed on the display panel; supplying a first dummy signal through a first dummy signal line disposed in a non-display area of ​​the display panel; supplying gate signals to the display panel using a plurality of gate clocks; supplying a second dummy signal through a second dummy signal line disposed in a non-display area of ​​the display panel; as well as Paths of the first dummy signal and the second dummy signal are controlled.

13. The touch driving method according to claim 12, wherein: The first pseudo signal is a pseudo touch drive signal having a phase opposite to that of the plurality of touch drive signals, and The second pseudo signal is a pseudo gate clock having a phase opposite to that of the plurality of gate clocks.

14. The touch driving method according to claim 13, wherein: In a touch sensing period in which the plurality of touch drive signals are supplied to the touch electrodes, the dummy touch drive signal is transmitted to the first dummy signal line, and In the touch processing period for calculating touch coordinates according to the touch sensing signal, the pseudo gate clock is sent to the first pseudo signal line.

15. The touch driving method according to claim 14, wherein: The touch processing period is a period during which the plurality of touch driving signals are not supplied to the touch electrodes.

16. The touch driving method according to claim 14, in a time-division driving operation in which a touch driving period and a display driving period are divided in time, in, The touch sensing period is included in the touch driving period, and The touch processing period is included in the display driving period.

17. The touch driving method according to claim 12, wherein: A portion of the second dummy signal lines is disposed outside a gate clock line that transmits the plurality of gate clocks, and Other second dummy signal lines among the second dummy signal lines are arranged outside the first dummy signal line.

18. The touch driving method according to claim 17, wherein: The part of the second dummy signal lines is a line that transmits a dummy scanning signal having a phase opposite to that of the scanning signal in the gate signal, and The other second dummy signal lines among the second dummy signal lines are lines that transmit dummy emission signals having a phase opposite to that of the emission signal among the gate signals.

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