TOUCH DISPLAY DEVICE AND METHOD FOR DRIVING A TOUCH DISPLAY DEVICE - Patent application

Abstract

To provide a touch display device and a method for driving the touch display device that can reduce image quality degradation caused by an uplink signal transmitted to an active stylus.SOLUTION: An embodiment of the present disclosure relates to a touch display device and a method for driving the touch display device. The touch display device includes: a display panel including a plurality of touch electrodes; a driving circuit for driving the display panel; a touch circuit for detecting a position of a stylus using a downlink signal transmitted from the stylus; and a timing controller for controlling the driving circuit and the touch circuit. The touch display device operates in a global uplink mode that supplies a global uplink signal to the entire display panel during a blank period and operates in a local uplink mode that supplies a plurality of local uplink signals having different phases to a plurality of regions during a display driving period.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The embodiments of the present disclosure relate to a touch display device and a method for driving the touch display device, and more particularly, to a touch display device and a method for driving the touch display device that can reduce image quality degradation caused by an uplink signal transmitted to a stylus. [Background technology]

[0002] As the information society develops, there is an increasing demand for display devices for displaying images in various forms. Various display devices, such as liquid crystal displays, electroluminescent displays, and quantum dot displays, are used as display devices.

[0003] In order to provide more diverse functions, such display devices provide a function of recognizing a user's touch with a finger or a pen on the display panel and performing input processing based on the recognized touch.

[0004] As an example, a touch display device capable of touch recognition may include a plurality of touch electrodes disposed or built into a display panel, and may detect the presence of a user's touch on the display panel and the touch coordinates by driving the touch electrodes.

[0005] The range of use of such touch display devices is expanding not only to mobile devices such as smartphones and tablet PCs, but also to large-screen touch display devices such as automobile displays and exhibition displays.

[0006] In this case, the touch function of the touch display device can be achieved not only by a passive stylus such as a finger, but also by an active stylus capable of transmitting and receiving signals to and from a display panel.

[0007] Meanwhile, in accordance with a trend for touch display devices to be manufactured to be lightweight and thin, the distance between the touch electrodes and the data lines located on the display panel is becoming closer.

[0008] As a result, when the display panel transmits an uplink signal to the active stylus for communication with the active stylus, noise may occur in the data voltage due to the uplink signal, which may degrade the quality of an image displayed on the display panel. Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, the inventors of the present disclosure have invented a touch display device and a method for driving the touch display device that can reduce image quality degradation caused by an uplink signal transmitted to an active stylus.

[0010] An embodiment of the present disclosure may provide a touch display device and a method for driving a touch display device that can minimize deviation of data voltage due to an uplink signal by operating in a global uplink mode during a blank period and in a local uplink mode during a display driving period.

[0011] In addition, the embodiments of the present disclosure may provide a touch display device and a method for driving a touch display device, which can compensate for deviation in data voltage due to touch drive signals by applying a first phase touch drive signal to a first local area where an active stylus is located in a local uplink mode and applying a second phase touch drive signal to a second local area adjacent to the first local area. [Means for solving the problem]

[0012] An embodiment of the present disclosure may provide a touch display device including a display panel including a plurality of touch electrodes, a drive circuit for driving the display panel, a touch circuit for detecting a position of a stylus using a downlink signal transmitted from the stylus, and a timing controller for controlling the drive circuit and the touch circuit, wherein the touch circuit operates in a global uplink mode for supplying a global uplink signal to the entire display panel during a blank period, and the touch circuit operates in a local uplink mode for supplying a plurality of local uplink signals having different phases to a plurality of regions during a display drive period.

[0013] An embodiment of the present disclosure may provide a method for driving a touch display device, in which a touch circuit detects the position of a stylus, the method including: operating in a global uplink mode for supplying a global uplink signal to the entire display panel during a blank period; determining the position of the stylus using a downlink signal transmitted from the stylus; and operating in a local uplink mode for supplying multiple local uplink signals having different phases to multiple regions during a display driving period. Effect of the Invention

[0014] According to the embodiment of the present disclosure, it is possible to reduce image quality degradation caused by an uplink signal transmitted to an active stylus, and to manufacture a lightweight touch display device.

[0015] In addition, according to the embodiment of the present disclosure, by operating in a global uplink mode during a blank period and operating in a local uplink mode during a display driving period, deviation of a data voltage due to an uplink signal can be minimized.

[0016] In addition, according to the embodiment of the present disclosure, in the local uplink mode, a touch drive signal of a first phase is applied to a first local area where an active stylus is located, and a touch drive signal of a second phase is applied to a second local area adjacent to the first local area, thereby compensating for deviation of a data voltage due to a touch drive signal. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a touch display device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a simplified diagram illustrating a mutual capacitance-based touch electrode structure in a touch display device according to an embodiment of the present disclosure. [Diagram 3] FIG. 2 is an exemplary diagram illustrating a sub-pixel circuit of a touch display device according to an embodiment of the present disclosure. [Figure 4] 10 is a diagram illustrating an example of a case where a touch driving period proceeds independently of a display driving period in a touch display device according to an embodiment of the present disclosure; [Diagram 5] 1 illustrates an operation between a touch display device and a stylus according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is an exemplary diagram illustrating touch driving timing between a touch display device and a stylus according to an embodiment of the present disclosure. [Figure 7] 13 is a diagram showing the concept of crosstalk caused by an uplink signal during the stylus sensing process. FIG. [Figure 8] 13 is a diagram showing the concept of crosstalk caused by an uplink signal during the stylus sensing process. FIG. [Figure 9] 10 is a diagram illustrating an example in which bright or dark lines appear on a display panel due to crosstalk caused by an uplink signal; [Figure 10] 4 is a flowchart illustrating a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 11]10 is a diagram illustrating an example of an operating state of a global uplink mode in a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 12] FIG. 10 is a diagram illustrating an example of an operating state of a local uplink mode in a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 13] 10A and 10B are diagrams illustrating an example of a first local area and a second local area in a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 14] FIG. 10 is a diagram illustrating another example of a first local area and a second local area in a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 15] FIG. 10 is a diagram illustrating another example of a first local area and a second local area in a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 16] FIG. 10 is a diagram exemplarily illustrating an operating state of another local uplink mode in a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 17] FIG. 10 is a diagram illustrating an example of a first local area, a second local area, and a third local area in a method for driving a touch display device according to an embodiment of the present disclosure. [Figure 18] 11 is a diagram comparing the change in driving current caused by the method for driving a touch display device according to an embodiment of the present disclosure with the conventional method. [Figure 19] FIG. 11 is a diagram comparing crosstalk caused by a method for driving a touch display device according to an embodiment of the present disclosure with a conventional method. [Figure 20] FIG. 2 is a simplified diagram illustrating a self-capacitance based touch electrode structure in a touch display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Some embodiments of the present invention will be described in detail below with reference to the drawings. When adding reference numerals to components in each drawing, the same components may be assigned the same numerals as much as possible even if they are displayed in different drawings. In addition, when describing the present invention, if a specific description of a related known configuration or function is determined to make the gist of the present invention unclear, the detailed description may be omitted. When "includes," "has," "performed," and the like are used in this specification, other parts may be added unless "only" is used. When a component is expressed as a singular number, it may include a case where a plurality is included unless otherwise explicitly stated.

[0019] In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. are used. These terms are used to distinguish the components from other components, and do not limit the essence, order, procedure, number, etc. of the components.

[0020] In describing the positional relationship of components, when two or more components are described as being "coupled," "coupled," or "connected," it should be understood that the two or more components may be directly "coupled," "coupled," or "connected," but that the two or more components may also be "coupled," "coupled," or "connected" through an additional "intervening" component. Here, the additional component may be included in one or more of the two or more components that are "coupled," "coupled," or "connected" to each other.

[0021] In describing a temporal sequence of components, methods of operation, methods of production, etc., when the temporal or chronological sequence is described using, for example, "after," "following," "after," or "before," this can include cases where the sequence is not consecutive, unless "immediately" or "directly" is used.

[0022] On the other hand, when referring to numerical values ​​or corresponding information (e.g., levels, etc.) for components, even if there is no explicit mention otherwise, the numerical values ​​or corresponding information can be interpreted as including an error range that may arise due to various factors (e.g., process factors, internal or external impacts, noise, etc.).

[0023] Various embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0024] FIG. 1 is a diagram showing a schematic configuration of a touch display device according to an embodiment of the present disclosure.

[0025] Referring to FIG. 1, a 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 images.

[0026] The display panel 110 may include a display area DA where an image is displayed, and a non-display area NDA where no image is displayed.

[0027] The non-display area NDA may be an outer peripheral area of ​​the display area DA, and may also be referred to as a bezel area. The non-display area NDA may be an area that is visible from the front surface of the touch display device 100, or may be an area that is curved and cannot be seen from the front surface of the touch display device 100.

[0028] The display panel 110 may include a plurality of sub-pixels SP. For example, the touch display device 100 may be any type of display device, including a liquid crystal display device, an organic light emitting display device, a micro LED (Micro Light Emitting Diode) display device, a quantum dot display device, etc.

[0029] The structures of the sub-pixels SP may vary depending on the type of the touch display device 100. For example, when the touch display device 100 is a self-emitting 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.

[0030] In addition, the display panel 110 may further include various types of signal lines to drive the 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).

[0031] The data lines DL and the gate lines GL may cross each other. Each of the gate lines GL may be arranged to extend in a first direction corresponding to a row direction. Each of the data lines DL may be arranged to extend in a second direction corresponding to a column direction.

[0032] Here, the first direction and the second direction are relative. For example, the first direction may be the horizontal direction and the second direction may be the vertical direction. As another example, the first direction may be the vertical direction and the second direction may be the horizontal direction.

[0033] The data driving circuit 130 is a circuit for driving a plurality of data lines DL and can output data signals to the plurality of data lines DL. The gate driving circuit 120 is a circuit for driving a plurality of gate lines GL and can output gate signals to the plurality of gate lines GL.

[0034] The timing controller 140 is a device for controlling the data driving circuit 130 and the gate driving circuit 120, and can control the driving timing for the plurality of data lines DL and the driving timing for the plurality of gate lines GL.

[0035] The timing controller 140 can provide various types of data drive control signals DCS to the data drive circuit 130 for controlling the data drive circuit 130, and can provide various types of gate drive control signals GCS to the gate drive circuit 120 for controlling the gate drive circuit 120.

[0036] The data driving circuit 130 can supply data signals to a plurality of data lines DL under the driving timing control of the timing controller 140. The data driving circuit 130 can receive digital video data DATA from the timing controller 140, convert the received video data DATA into analog data signals, and output the analog data signals to a plurality of data lines DL.

[0037] The gate drive circuit 120 can supply gate signals to a plurality of gate lines GL under the timing control of the timing controller 140. The gate drive circuit 120 is supplied with a first gate voltage corresponding to a turn-on level voltage and a second gate voltage corresponding to a turn-off level voltage together with various gate drive control signals GCS, and can generate gate signals and supply the generated gate signals to a plurality of gate lines GL. Here, the turn-on level voltage may be a high level voltage and the turn-off level voltage may be a low level voltage. Conversely, the turn-on level voltage may be a low level voltage and the turn-off level voltage may be a high level voltage.

[0038] The touch display device 100 may include a touch screen panel and a touch circuit 150 that senses the touch screen panel to provide a touch sensing function in addition to an image display function, and detects whether a touch has occurred by a touch object such as a finger or a pen, and detects the touch position.

[0039] The touch circuit 150 may include a touch driving circuit 152 that drives and senses the touch screen panel to generate and output touch sensing data, and a touch controller 154 that can detect the occurrence of a touch or detect the touch position using the touch sensing data.

[0040] The touch screen panel may include a plurality of touch electrodes TE as a touch sensor. The touch screen panel may further 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.

[0041] The touch screen panel may be present outside the display panel 110 or may be present inside the display panel 110. When the touch screen panel is present outside the display panel 110, it is called an external touch screen panel. When the touch screen panel is an external type, the touch screen panel and the display panel 110 can be manufactured separately and combined. The external touch screen panel may include a substrate and a plurality of touch electrodes TE on the substrate.

[0042] If the touch screen panel is inside the display panel 110, it is called an embedded touch screen panel. In the case of an embedded touch screen panel, the touch screen panel may be formed within the display panel 110 during the manufacturing process of the display panel 110.

[0043] The touch drive circuit 152 can supply a touch drive signal to at least one touch electrode TE among the multiple touch electrodes TE, detect a touch sensing signal transmitted from at least one touch electrode TE among the multiple touch electrodes TE, and generate touch sensing data.

[0044] The touch circuit 150 may perform touch sensing using a self-capacitance method or a mutual-capacitance method.

[0045] When the touch circuit 150 performs touch sensing using a self-capacitance method, the touch circuit 150 can perform touch sensing based on the capacitance between each touch electrode TE and a touch object (eg, a finger, a pen, etc.).

[0046] When the touch circuit 150 performs touch sensing using a mutual capacitance method, the touch circuit 150 can perform touch sensing based on the capacitance between the touch electrodes TE.

[0047] According to the mutual capacitance method, the plurality of touch electrodes TE are divided into touch driving electrodes and touch sensing electrodes. The touch driving circuit 152 can drive the touch driving electrodes using a touch driving signal and detect a touch sensing signal from the touch sensing electrodes.

[0048] According to the self-capacitance scheme, each of the plurality of touch electrodes TE can function as both a touch driving electrode and a touch sensing electrode. The touch driving circuit 152 can drive all or a part of the plurality of touch electrodes TE and sense all or a part of the plurality of touch electrodes TE.

[0049] The touch driving circuit 152 and the touch controller 154 may be implemented as separate devices or may be implemented as one device.

[0050] Alternatively, the touch driving circuit 152 and the data driving circuit 130 may be implemented as separate integrated circuits. Alternatively, the whole or a part of the touch driving circuit 152 and the whole or a part of the data driving circuit 130 may be integrated into one integrated circuit.

[0051] The touch display device 100 according to the embodiment of the present disclosure may be a self-emitting display device in which self-emitting light-emitting elements are arranged on the display panel 110, such as an organic light-emitting display device, a quantum dot display device, or a micro LED display device.

[0052] FIG. 2 is a schematic diagram of a mutual capacitance-based touch electrode structure in a touch display device according to an embodiment of the present disclosure.

[0053] 2, in the touch display device 100 according to the embodiment of the present disclosure, the mutual capacitance-based touch electrode structure may include a plurality of X-touch electrodes X-TE and a plurality of Y-touch electrodes Y-TE formed on the display panel 110. Here, the plurality of X-touch electrodes X-TE and the plurality of Y-touch electrodes Y-TE may be located on an upper portion of an encapsulation layer.

[0054] Each of the multiple X-touch electrodes X-TE can be arranged in a first direction, and each of the multiple Y-touch electrodes Y-TE can be arranged in a second direction different from the first direction.

[0055] In the present disclosure, the first direction and the second direction may be relatively different directions, and as an 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. In addition, the first direction and the second direction may be orthogonal to each other, but may not be orthogonal to each other. In addition, in this specification, rows and columns are relative, and rows and columns may change depending on the viewpoint.

[0056] Each of the multiple X-touch electrodes X-TE can be composed of several electrically connected X-touch electrode segments. Each of the multiple Y-touch electrodes Y-TE can be composed of several electrically connected Y-touch electrode segments.

[0057] Here, the plurality of X-touch electrodes X-TE and the plurality of Y-touch electrodes Y-TE are included in the plurality of touch electrodes TE and are electrodes whose roles (functions) can be distinguished. For example, the plurality of X-touch electrodes X-TE may be touch driving electrodes, and the plurality of Y-touch electrodes Y-TE may be touch sensing electrodes. Conversely, the plurality of X-touch electrodes X-TE may be touch sensing electrodes, and the plurality of Y-touch electrodes Y-TE may be touch driving electrodes.

[0058] The multiple touch lines TL may include one or more X-touch lines X-TL connecting to each of the multiple X-touch electrodes X-TE, and one or more Y-touch lines Y-TL connecting to each of the multiple Y-touch electrodes Y-TE.

[0059] The touch circuit 150 can provide touch driving signals to the X-touch electrodes X-TE via the X-touch lines X-TL and receive touch sensing signals generated on the Y-touch electrodes Y-TE via the Y-touch lines Y-TL.

[0060] FIG. 3 is an exemplary diagram illustrating a sub-pixel circuit of a touch display device according to an embodiment of the present disclosure.

[0061] Referring to FIG. 3, a sub-pixel SP of the touch display device 100 according to the embodiment of the present disclosure includes first to sixth switching transistors T1 to T6, a driving transistor DRT, a storage capacitor Cst, and a light emitting element ED.

[0062] Here, the light emitting element ED may be, for example, a self-emitting element that can emit light by itself, such as an organic light emitting diode (OLED).

[0063] In the subpixel SP according to the embodiment of the present disclosure, the second to fourth switching transistors T2 to T4, the sixth switching transistor T6, and the driving transistor DRT may be P-type transistors, and the first switching transistor T1 and the fifth switching transistor T5 may be N-type transistors.

[0064] P-type transistors are relatively more reliable than N-type transistors. In the case of P-type transistors, the source electrode can be fixed to the high potential driving voltage VDD during light emission, so the current flowing through the light emitting element ED does not fluctuate due to the capacitor Cst. Therefore, it is easy to supply a stable current.

[0065] When the P-type transistor is connected to the anode electrode of the light emitting element ED and operates in a saturation region, it can pass a constant current regardless of changes in the threshold voltage, and therefore has relatively high reliability.

[0066] In such a subpixel SP structure, the N-type transistors T1, T5 may be oxide transistors formed using an oxide semiconductor (e.g., transistors having a channel formed from an oxide semiconductor such as indium, gallium, zinc oxide or IGZO), and the other P-type transistors DRT, T2-T4, T6 may be silicon transistors formed from a semiconductor such as silicon (e.g., transistors having a polysilicon channel formed using a low-temperature process called LTPS or low-temperature polysilicon).

[0067] Since an oxide transistor has a characteristic of having a relatively smaller leakage current than a silicon transistor, when a transistor is implemented using an oxide transistor, it is possible to prevent current from leaking from the gate electrode of the driving transistor DRT, thereby reducing image quality defects such as flicker.

[0068] On the other hand, the remaining P-type transistors DRT, T2-T4, and T6 except for the first switching transistor T1 and the fifth switching transistor T5, which correspond to N-type transistors, may be made of low-temperature polysilicon.

[0069] The source electrode and drain electrode of the switching transistor described below may be changed to a drain electrode and a source electrode depending on the input voltage.

[0070] A gate electrode of the first switching transistor T1 is supplied with a first scan signal SCAN1, and a drain electrode of the first switching transistor T1 is connected to a gate electrode of the driving transistor DRT.

[0071] The source electrode of the first switching transistor T1 is connected to the drain electrode of the driving transistor DRT.

[0072] The first switching transistor T1 is turned on by a first scan signal SCAN1, and maintains the gate voltage of the driving transistor DRT constant by a storage capacitor Cst having one terminal fixed to a high potential driving voltage VDD.

[0073] The first switching transistor T1 may be an N-type MOS transistor to form an oxide transistor. Since an N-type MOS transistor uses electrons as carriers instead of holes, it has a faster migration speed than a P-type MOS transistor, and therefore the switching speed can be faster.

[0074] The gate electrode of the second switching transistor T2 is supplied with a second scan signal SCAN2. The source electrode of the second switching transistor T2 can be supplied with a data voltage Vdata or a bias voltage VOBS. The drain electrode of the second switching transistor T2 is connected to the source electrode of the driving transistor DRT.

[0075] The second switching transistor T2 is turned on by the second scan signal SCAN2 to supply the data voltage Vdata to the source electrode of the driving transistor DRT.

[0076] The third switching transistor T3 has a gate electrode supplied with a light emission signal EM, a source electrode supplied with a high potential drive voltage VDD, and a drain electrode connected to the source electrode of the drive transistor DRT.

[0077] The third switching transistor T3 is turned on by the light emission signal EM to supply the high potential driving voltage VDD to the source electrode of the driving transistor DRT.

[0078] The fourth switching transistor T4 has a gate electrode supplied with the light emission signal EM, a source electrode connected to the drain electrode of the drive transistor DRT, and an anode electrode connected to the light emitting element ED.

[0079] The fourth switching transistor T4 is turned on by the light emitting signal EM to supply a driving current to the anode electrode of the light emitting element ED.

[0080] The gate electrode of the fifth switching transistor T5 is supplied with a third scan signal SCAN3.

[0081] Here, the third scan signal SCAN3 may be the first scan signal SCAN1 supplied to the subpixel SP at another position. For example, when the first scan signal SCAN1 is applied to the n-th gate line, the third scan signal SCAN3 may use the first scan signal SCAN1[n-1] applied to the n-1th gate line. Alternatively, the first scan signal SCAN1[n-2] applied to the n-2th gate line or the first scan signal SCAN1[n-3] applied to the n-3th gate line may be used as the third scan signal SCAN3. That is, the third scan signal SCAN3 may use the first scan signal SCAN1 that changes the gate line GL according to the phase in which the display panel 110 is driven.

[0082] The drain electrode of the fifth switching transistor T5 is supplied with the stabilizing voltage Vini, and the source electrode of the fifth switching transistor T5 is connected to the gate electrode of the driving transistor DRT and to the storage capacitor Cst.

[0083] The fifth switching transistor T5 is turned on by the third scan signal SCAN3 to supply the stabilized voltage Vini to the gate electrode of the driving transistor DRT.

[0084] The gate electrode of the sixth switching transistor T6 is supplied with a fourth scan signal SCAN4.

[0085] Here, the fourth scan signal SCAN4 may be the second scan signal SCAN2 supplied to the sub-pixel SP at another position. For example, when the second scan signal SCAN2 is applied to the n-th gate line GL, the fourth scan signal SCAN4 may be the second scan signal SCAN2 applied to the (n-1)th gate line GL. That is, the fourth scan signal SCAN4 may use the second scan signal SCAN2 that is applied to different gate lines GL according to the phase in which the display panel 110 is driven.

[0086] A source electrode of the sixth switching transistor T6 is supplied with a reset voltage VAR, and a drain electrode of the sixth switching transistor T6 is connected to an anode electrode of the light-emitting element ED.

[0087] The sixth switching transistor T6 is turned on by the fourth scan signal SCAN4 to supply the reset voltage VAR to the anode electrode of the light emitting element ED.

[0088] The gate electrode of the drive transistor DRT is connected to the drain electrode of the first switching transistor T1, and the source electrode of the drive transistor DRT is connected to the drain electrode of the second switching transistor T2.

[0089] The driving transistor DRT is turned on by a voltage difference between the gate electrode and the source electrode, and a driving current is applied to the light emitting element ED.

[0090] The source electrode and the drain electrode of the first switching transistor T1 are respectively connected to the drain electrode and the gate electrode of the driving transistor DRT, and when the first switching transistor T1 is turned on, the threshold voltage of the driving transistor DRT can be sampled and compensated according to the data voltage Vdata applied to the source electrode of the driving transistor DRT.

[0091] A high potential drive voltage VDD is applied to one electrode of the storage capacitor Cst, and the other electrode is connected to the gate electrode of the drive transistor DRT. The storage capacitor Cst stores the voltage of the gate electrode of the drive transistor DRT.

[0092] An anode electrode of the light emitting element ED is connected to a drain electrode of the fourth switching transistor T4 and a drain electrode of the sixth switching transistor T6. A low potential driving voltage VSS is applied to a cathode electrode of the light emitting element ED.

[0093] The light emitting element ED emits light with a predetermined brightness due to a driving current flowing from the driving transistor DRT.

[0094] At this time, the stabilizing voltage Vini is supplied to stabilize a change in capacitance formed at the gate electrode of the driving transistor DRT, and the reset voltage VAR is supplied to reset the anode electrode of the light emitting device ED.

[0095] When a reset voltage VAR is supplied to the anode electrode of the light-emitting element ED while a fourth switching transistor T4, which is located between the anode electrode of the light-emitting element ED and the driving transistor DRT and is controlled by an emission signal EM, is turned off, the anode electrode of the light-emitting element ED can be reset.

[0096] The sixth switching transistor T6, which supplies a reset voltage VAR, is connected to the anode electrode of the light-emitting element ED.

[0097] A third scan signal SCAN3 for driving or initializing the driving transistor DRT and a fourth scan signal SCAN4 for controlling the supply of a reset voltage VAR to the anode electrode of the light-emitting element ED are separated from each other so that the driving operation of the driving transistor DRT and the operation of resetting the anode electrode of the light-emitting element ED are performed separately.

[0098] In this case, when the switching transistors T5 and T6 which supply the stabilizing voltage Vini and the reset voltage VAR are turned on, the fourth switching transistor T4 connecting the drain electrode of the driving transistor DRT and the anode electrode of the light-emitting element ED is turned off, thereby blocking the driving current of the driving transistor DRT from flowing to the anode electrode of the light-emitting element ED, and the sub-pixel SP can be configured so that the anode electrode is not affected by voltages other than the reset voltage VAR.

[0099] In this manner, the sub-pixel SP, which is composed of seven transistors DRT, T1, T2, T3, T4, T5, and T6, and one storage capacitor Cst, may have a 7T1C structure.

[0100] Here, a 7T1C structure is shown as an example among various structures of the subpixel SP circuit, and the structure and number of transistors and capacitors constituting the subpixel SP may be variously changed. Meanwhile, each of the multiple subpixels SP may have the same structure, or some of the multiple subpixels SP may have different structures.

[0101] The touch display device 100 according to the embodiment of the present disclosure may divide one frame period into one or more display driving periods and one or more touch driving periods, and may alternate between a display driving operation and a touch driving operation.

[0102] In sensing a user's finger touch, it may be more effective to alternate between a display driving operation and a touch driving operation.

[0103] Alternatively, the touch display device 100 according to the embodiment of the present disclosure may perform a touch driving period independently of a display driving period. In particular, in the case of an active stylus capable of transmitting and receiving signals to and from the display panel 110, it is more effective to perform a touch driving period independently of a display driving period.

[0104] FIG. 4 is a diagram illustrating an example of a case where a touch driving period proceeds independently of a display driving period in a touch display device according to an embodiment of the present disclosure.

[0105] Referring to FIG. 4, in the touch display device 100 according to the embodiment of the present disclosure, the display driving operation and the touch driving operation may be performed in different time periods, or the display driving operation and the touch driving operation may be performed simultaneously.

[0106] Therefore, the touch synchronization signal Tsync can play a role in distinguishing between the display driving period DP and the touch driving period TP, and can also distinguish and indicate only the touch driving period TP.

[0107] For example, the 16 touch drive periods TP1 to TP16 may be one touch frame period. Here, the touch frame period may mean a period during which a touch by a stylus can be sensed once over the entire screen.

[0108] Although the touch driving operation is performed in a high level period of the touch synchronization signal Tsync, the touch driving operation may be performed in a low level period of the touch synchronization signal Tsync. The display driving operation and the touch driving operation may be performed simultaneously or in a time division manner.

[0109] Among the touch drive periods TP1 to TP16 constituting a touch frame, a finger touch drive operation for sensing a touch by a finger may be performed in some periods, and a pen touch drive operation for sensing a touch by a stylus may be performed in other periods.

[0110] FIG. 5 is a diagram illustrating an example of the operation between a touch display device and a stylus according to an embodiment of the present disclosure.

[0111] Referring to FIG. 5, the touch display device 100 according to an embodiment of the present disclosure can transmit an uplink signal including various information for controlling the driving of the stylus 200 or various information required for driving the stylus 200 to the stylus 200 via a transmitting circuit during a touch driving period for stylus touch sensing.

[0112] More specifically, the touch circuit 150 supplies an uplink signal to one or more of a plurality of touch electrodes TE included in the display panel 110.

[0113] Thus, the stylus 200 adjacent to the display panel 110 can receive the uplink signal through the stylus tip. That is, the stylus 200 can receive the uplink signal through one or more of the touch electrodes TE included in the display panel 110.

[0114] In response to the uplink signal transmitted from the touch display device 100, the stylus 200 outputs a downlink signal indicating the position, inclination, or various additional information regarding the stylus 200.

[0115] The downlink signal output from the stylus 200 can be applied to the touch electrodes TE of the display panel 110.

[0116] The touch circuit 150 of the touch display device 100 receives a downlink signal output from the stylus 200 via the touch electrode TE, and can obtain the position, tilt, and various additional information of the stylus 200 based on the received downlink signal.

[0117] Here, the uplink signal may include, for example, a beacon signal (Beacon) or a ping signal (Ping).

[0118] The beacon signal (Beacon) is a control signal for the touch display apparatus 100 to control the driving of the stylus 200 or to inform the stylus 200 of necessary information, and may include various information necessary for driving the stylus 200.

[0119] For example, the beacon signal Beacon may include one or more of basic information of the display panel 110 (e.g., status information, identification information, in-cell type, etc.), driving mode information of the display panel 110 (e.g., mode identification information such as display mode, stylus search mode, etc.), characteristic information of the downlink signal (e.g., frequency, number of pulses, etc.), driving timing related information, multiplexer driving information, power mode information (e.g., operation mode for reducing power consumption, etc.), and may further include information for synchronization between the display panel 110 and the stylus 200.

[0120] The ping signal Ping may be a control signal for synchronization of the downlink signal.

[0121] The additional information that may be included in the downlink signal may include, for example, one or more of pressure, stylus ID, button information, battery information, and information for information error checking and correction.

[0122] FIG. 6 is an exemplary diagram illustrating touch driving timing between a touch display device and a stylus according to an embodiment of the present disclosure.

[0123] Here, an example is taken in which 16 touch drive periods TP1 to TP16 are regularly repeated. In this case, the 16 touch drive periods TP1 to TP16 may be one touch frame period. In this case, one touch frame period may include a finger touch drive period in which a finger touch can be sensed.

[0124] When the touch drive operation for the stylus 200 is performed simultaneously with the display drive operation, one touch frame period may correspond to one frame period in which the display drive operation is performed, or one frame period may include multiple touch frame periods.

[0125] Also shown here are downlink signals output from the stylus 200 and various uplink signals supplied by the touch circuitry 150 to the display panel 110 at timings predetermined by the protocol.

[0126] Referring to FIG. 6, during one touch frame period corresponding to 16 touch drive periods TP1 to TP16, a beacon signal, which is one of the uplink signals, may be transmitted from the display panel 110 to the stylus 200 once or twice or more times, and the transmission period of the beacon signal may be one or two or more touch drive periods (e.g., TP1) among the 16 touch drive periods TP1 to TP16 that are predetermined by a protocol.

[0127] On the other hand, the beacon signal may be transmitted periodically every one touch frame period, the beacon signal may be transmitted periodically every two or more touch frame periods, or the beacon signal may be transmitted in any touch frame period upon the occurrence of a predetermined event, etc.

[0128] When a beacon signal is transmitted from the display panel 110 to the stylus 200, the stylus 200 can respond to the beacon signal by outputting a downlink signal at a touch drive period (here, TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) determined according to a predefined protocol.

[0129] The downlink signal output from the stylus 200 may be a downlink signal that enables the touch display apparatus 100 to sense the coordinates (position) and tilt of the stylus 200 .

[0130] In addition, the downlink signal output from the stylus 200 may be a downlink signal representing data including various additional information of the stylus 200. Here, the data may include, for example, pressure, ID, button information, battery information, information for error checking and correction, etc.

[0131] The downlink signal output from the stylus 200 may be applied to one or more of a plurality of touch electrodes TE included in the display panel 110.

[0132] The 16 touch driving periods TP1 to TP16 included in one touch frame period may include one or more touch driving periods (for example, TP2, TP5, TP9, and TP13) for sensing one or more of the coordinates and tilt of the stylus.

[0133] In accordance with such touch driving periods (eg, TP2, TP5, TP9, and TP13), the stylus 200 can output a downlink signal related to sensing of one or more of coordinates and tilt.

[0134] In this case, the downlink signal may be a signal consisting of pulses that periodically swing between a high level and a low level.

[0135] The 16 touch drive periods TP1 to TP16 included in one touch frame period may include one or more touch drive periods (for example, TP3, TP6, TP7, TP14, and TP15) in which data can be sensed.

[0136] In accordance with such touch drive periods (for example, TP3, TP6, TP7, TP14, and TP15), the stylus 200 can output a downlink signal related to data sensing.

[0137] In such a case, the downlink signal may be a signal consisting of non-periodic pulses representing additional information contained in the data.

[0138] As described above, when a downlink signal is output from the stylus 200 in accordance with the touch drive period defined by the protocol, the touch circuit 150 can receive the downlink signal through the display panel 110 and perform sensing processing on the stylus 200 based on the received downlink signal.

[0139] Here, the pen sensing process may include one or more of a process of sensing the coordinates of the stylus 200, a process of sensing the inclination of the stylus 200, and a process of recognizing pen-added information included in the data Data.

[0140] Meanwhile, the 16 touch drive periods TP1 to TP16 included in one touch frame period may include one or more touch drive periods (for example, TP4, TP8, TP10, TP11, TP12, and TP16) for sensing a finger touch.

[0141] During such one or more touch drive periods (e.g., TP4, TP8, TP10, TP11, TP12, TP16), the touch circuit 150 can supply a touch drive signal TDS for sensing a finger touch to all or some of the multiple touch electrodes TE included in the display panel 110.

[0142] Such a touch drive signal TDS may be a signal that swings between a high level and a low level, that is, the touch drive signal TDS may be a modulated signal whose voltage level is variable.

[0143] Meanwhile, among the touch drive periods (e.g., TP1, TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) for sensing a pen touch, the touch circuit 150 may supply a DC voltage with a constant voltage level to the display panel 110 during the remaining touch drive periods (e.g., TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) excluding the touch drive period (e.g., TP1) corresponding to the beacon signal transmission period.

[0144] Here, the DC voltage may be a low-level voltage such as a touch drive signal and a beacon signal, a high-level voltage, any voltage between the low-level voltage and the high-level voltage, or a ground voltage.

[0145] The touch drive operation proceeding during a stylus touch drive period (e.g., TP1, TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) for sensing a touch of the stylus 200 may be the stylus touch drive operation. And the touch drive operation proceeding during a finger touch drive period (e.g., TP4, TP8, TP10, TP11, TP12, TP16) for sensing a finger touch may be the finger touch drive operation.

[0146] The touch drive period TP may be composed of only the stylus touch drive period, may be composed of only the finger touch drive period, or may include both the stylus touch drive period and the finger touch drive period.

[0147] In this case, when an uplink signal transmitted from the touch display device 100 to the stylus 200 is included in the display driving period, a coupling capacitance is formed on the data line at the position where the uplink signal intersects with the touch electrode to which the uplink signal is applied, and thus bright or dark lines may appear in the image image due to crosstalk caused by the data voltage.

[0148] The touch display device 100 of the present disclosure may transmit an uplink signal to the entire area of ​​the display panel during a blank period during a pen touch driving period for stylus touch sensing, and then transmit an uplink signal with a different phase according to the position of the stylus. Meanwhile, during a finger touch driving period for finger touch sensing, a touch driving signal TDS may be sequentially supplied to touch electrodes arranged on the display panel 110.

[0149] Figures 7 and 8 are diagrams showing the concept of crosstalk occurring due to an uplink signal during a stylus sensing process, and Figure 9 is a diagram showing an example of a case where bright or dark lines appear on a display panel due to crosstalk caused by an uplink signal.

[0150] 7 to 9, in the touch display device 100, a stylus touch driving period for sensing the stylus 200 may be temporally separated from or overlapped with a display driving period DP for displaying an image.

[0151] Here, the stylus touch driving period for stylus sensing will be mainly described.

[0152] In such a structure, when the stylus touch drive period overlaps with the display drive period DP, a ripple is formed in the base voltage EVSS flowing to the cathode electrode due to the pulsed uplink signal supplied via the touch electrode TE during the display drive period DP.

[0153] Such ripples are prominent at the time of transition when the uplink signal changes from a low level to a high level or from a high level to a low level.

[0154] The ripple voltage formed on the cathode electrode generates crosstalk on the data line DL at the position where it intersects with the touch electrode, causing a bright line or a dark line to appear at a position corresponding to the uplink signal.

[0155] The touch display device 100 of the present disclosure operates in a global uplink mode in which an uplink signal is transmitted to the entire area of ​​the display panel 110 during a blank period BP, and in a local uplink mode in which an uplink signal of a different phase is transmitted during a display driving period DP according to the position of the detected stylus, thereby reducing crosstalk caused by the uplink signal and improving the quality of the image.

[0156] FIG. 10 is a flow chart illustrating a method for driving a touch display device according to an embodiment of the present disclosure.

[0157] Referring to FIG. 10, a method for driving a touch display device according to an embodiment of the present disclosure may include step S100 of operating in a global uplink mode during a blank period BP, step S200 of determining the position of the stylus 200, and step S300 of operating in a local uplink mode according to the position of the stylus 200 during a display driving period DP.

[0158] Step S100 of operating in a global uplink mode during a blank period BP is a process of transmitting an uplink signal to the stylus 200 through the entire area of ​​the display panel 110 during the blank period BP during which no image is displayed within one frame period.

[0159] In the global uplink mode, the uplink signal supplied to the entire display panel 110 during the blank period BP can have the same phase.

[0160] The blank period BP is a period in which no video image is displayed within one frame. Therefore, even if an uplink signal is supplied to the entire area of ​​the display panel 110 during the blank period BP, no degradation in image quality due to the uplink signal occurs.

[0161] FIG. 11 is a diagram illustrating an example of an operating state of a global uplink mode in a method for driving a touch display device according to an embodiment of the present disclosure.

[0162] Referring to FIG. 11, the method for driving a touch display device according to an embodiment of the present disclosure may provide a pulsed uplink signal to the entire area of ​​the display panel 110 during a blank period BP.

[0163] At this time, since the data voltage Vdata is not applied through the data line DL during the blank period BP, no crosstalk occurs in the data voltage Vdata due to the uplink signal supplied to the blank period BP.

[0164] As a result, during the blank period BP, the position of the stylus 200 in proximity to and / or in contact with the display panel 110 can be detected without degradation in image quality, such as bright or dark lines.

[0165] The step S200 of determining the position of the stylus 200 is a process of determining the position of the stylus 200 using a downlink signal transmitted from the stylus 200.

[0166] At this time, the downlink signal transmitted from the stylus 200 may be transmitted during the blank period BP or during the display driving period DP.

[0167] Using the downlink signal transmitted from the stylus 200 , the touch circuitry 150 can detect the position of the stylus 200 or the approximate area in which the stylus 200 is in proximity to and / or in contact with the display panel 110 .

[0168] Step S300 of operating in local uplink mode according to the position of the stylus 200 during the display driving period DP is a process of supplying a first uplink signal having a first phase to a first local area and supplying a second uplink signal having a second phase to a second local area based on the position of the stylus 200.

[0169] FIG. 12 is a diagram illustrating an example of an operation state of a local uplink mode in a method for driving a touch display device according to an embodiment of the present disclosure.

[0170] Referring to FIG. 12, the touch display device 100 according to an embodiment of the present disclosure can operate in a local uplink mode within a display driving period DP.

[0171] In the local uplink mode, the touch circuit 150 can divide the display panel 110 into a first local area Local A and a second local area Local B based on the position of the stylus 200 detected in the global uplink mode.

[0172] In the touch display device 100 of the present disclosure, a first local area Local A and a second local area Local B to which uplink signals of different phases are applied may be formed along a direction intersecting the data line DL, so as to reduce crosstalk caused by coupling capacitance formed between touch electrodes intersecting the data line DL.

[0173] The first local area Local A and the second local area Local B extend along the first touch electrode through which the uplink signal is transmitted.

[0174] The first touch electrodes extend or are arranged in a direction intersecting with the data lines DL. For example, the data lines DL may extend in a second direction (e.g., a column direction) and the first touch electrodes may be arranged or extend in a first direction (e.g., a row direction).

[0175] The first local area Local A may include a first touch electrode where the stylus 200 is detected. The first local area Local A may further include another first touch electrode adjacent to the first touch electrode where the stylus 200 is detected.

[0176] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase is supplied to a first local area Local A.

[0177] The second local area Local B may include touch electrodes where the stylus 200 is not located.

[0178] The second local region Local B may be selected to correspond to the size of the first local region Local A. The second local region Local B may also be selected at a position adjacent to the first local region Local A, or at a position spaced apart from the first local region Local A by a certain distance. The second local region Local B may be the remaining area of ​​the display panel 110 that is not covered by the first local region Local A.

[0179] During the display driving period DP, a second uplink signal Uplink_P2 of a second phase different from the first phase is supplied to the second local area Local B. The second phase may be an opposite phase to the first phase.

[0180] In this manner, when a first uplink signal Uplink_P1 of a first phase is supplied through a touch electrode in a first local area during a display driving period DP, and a second uplink signal Uplink_P2 of a second phase is supplied through a touch electrode in a second local area, such an inverted uplink signal can cancel out crosstalk formed on a data line DL perpendicular to the touch electrode to which the uplink signal is applied, thereby preventing degradation of image quality such as bright lines and dark lines.

[0181] FIG. 13 is an exemplary diagram illustrating a first local area and a second local area in a method for driving a touch display device according to an embodiment of the present disclosure.

[0182] Referring to FIG. 13, the method for driving a touch display device according to an embodiment of the present disclosure can detect the position of the stylus 200 based on the global uplink mode in the blank period BP.

[0183] In the case of a mutual capacitance-based touch electrode structure, the display panel 110 may be arranged with a plurality of X-touch electrodes X-TE1 to X-TE8 to which a touch driving signal is applied and a plurality of Y-touch electrodes Y-TE1 to Y-TE6 to transmit a touch sensing signal.

[0184] For example, if the stylus 200 is detected to be located over the third X-touch electrode X-TE3, the first local area Local A may be selected as the area including the third X-touch electrode X-TE3.

[0185] Here, a case is shown in which the first local area Local A is selected as an area including the third X-touch electrode X-TE3 where the stylus 200 is located and the adjacent second X-touch electrode X-TE2 and fourth X-touch electrode X-TE4.

[0186] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase may be supplied to a first local area Local A.

[0187] The second local area Local B may be selected with a size corresponding to the first local area Local A.

[0188] When the first local area Local A is selected as an area including three X-touch electrodes X-TE2, X-TE3, and X-TE4, the second local area Local B may also be selected as an area including three X-touch electrodes (e.g., X-TE5, X-TE6, and X-TE7).

[0189] The first uplink signal Uplink_P1 supplied to the first local area Local A allows the position of the stylus 200 to be detected more accurately.

[0190] The second local region Local B may be selected at a position adjacent to the first local region Local A, or may be selected at a position spaced apart from the first local region Local A.

[0191] During the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase may be supplied to the second local area Local B. The second phase may have an opposite phase to the first phase.

[0192] FIG. 14 is a diagram illustrating another example of the first local area and the second local area in the method for driving a touch display device according to an embodiment of the present disclosure.

[0193] Referring to FIG. 14, the method for driving a touch display device according to an embodiment of the present disclosure can detect the position of the stylus 200 based on the global uplink mode in the blank period BP.

[0194] For example, when the stylus 200 is detected to be located on the third X-touch electrode X-TE3, the first local area Local A may be selected as an area including the third X-touch electrode X-TE3 and the adjacent second X-touch electrode X-TE2 and fourth X-touch electrode X-TE4.

[0195] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase may be supplied to a first local area Local A.

[0196] The second local area Local B may be selected with a size corresponding to the first local area Local A.

[0197] When the first local area Local A is selected as an area including three X-touch electrodes X-TE2, X-TE3, and X-TE4, the second local area Local B may also be selected as an area including three X-touch electrodes (e.g., X-TE1, X-TE5, and X-TE6).

[0198] In this case, a part of the second local area Local B may be selected above the first local area Local A, and another part may be selected below the first local area Local A.

[0199] For example, a first X-touch electrode X-TE1 may be selected in an upper portion adjacent to the first local area Local A, and a fifth X-touch electrode X-TE5 and a sixth X-touch electrode X-TE6 may be selected in a lower portion adjacent to the first local area Local A to form a second local area Local B.

[0200] During the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase may be supplied to the second local area Local B. The second phase may have an opposite phase to the first phase.

[0201] FIG. 15 is a diagram illustrating another example of the first local area and the second local area in the method for driving a touch display device according to an embodiment of the present disclosure.

[0202] Referring to FIG. 15, the method for driving a touch display device according to an embodiment of the present disclosure can detect the position of the stylus 200 based on the global uplink mode in the blank period BP.

[0203] In this case, the first local area Local A and the second local area Local B may be selected alternately.

[0204] For example, when the stylus 200 is detected to be located on the fifth X-touch electrode X-TE5, the fifth X-touch electrode X-TE5 may be selected as the first local area Local A.

[0205] And, the fourth X-touch electrode X-TE4 and the sixth X-touch electrode X-TE6 adjacent to the fifth X-touch electrode X-TE5 may be selected as a second local area Local B.

[0206] In addition, the third X-touch electrode X-TE3 and the seventh X-touch electrode X-TE7 may be selected as the first local area Local A.

[0207] In this way, the first local area Local A and the second local area Local B may be selected to be positioned alternately around the position of the stylus 200 .

[0208] In this case as well, it is preferable to select the first local area Local A and the second local area Local B to have the same size.

[0209] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase can be supplied to a first local area Local A.

[0210] Also, during the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase can be supplied to the second local area Local B. The second phase can have an opposite phase to the first phase.

[0211] Meanwhile, the method of driving a touch display device disclosed herein may further include a third local area to which a third uplink signal having a DC phase is applied, in addition to a first local area Local A to which a first uplink signal Uplink_P1 of a first phase is applied and a second local area Local B to which a second uplink signal Uplink_P2 of a second phase is applied.

[0212] FIG. 16 is a diagram exemplarily illustrating an operation state of another local uplink mode in the method for driving a touch display device according to an embodiment of the present disclosure.

[0213] Referring to FIG. 16, the touch display device 100 according to an embodiment of the present disclosure can operate in a local uplink mode within a display driving period DP.

[0214] The local uplink mode can divide the display panel 110 into a first local area Local A, a second local area Local B, and a third local area Local C based on the position of the stylus 200 detected in the global uplink mode.

[0215] The first local area Local A, the second local area Local B, and the third local area Local C extend along the touch electrode through which the uplink signal is transmitted.

[0216] The first local area Local A may include a touch electrode on which the stylus 200 is located or a touch electrode adjacent to the touch electrode on which the stylus 200 is located.

[0217] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase is supplied to a first local area Local A.

[0218] The second local region Local B may be selected from the region where the stylus 200 is not located.

[0219] The second local region Local B may be selected to correspond to the size of the first local region Local A. Also, the second local region Local B may be selected from a position adjacent to the first local region Local A, or may be selected from a position spaced apart from the first local region Local A by a certain distance.

[0220] During the display driving period DP, a second uplink signal Uplink_P2 of a second phase different from the first phase is supplied to the second local area Local B. The second phase may be the opposite phase to the first phase.

[0221] The third local area Local C may be selected from an area that does not correspond to the first local area Local A and the second local area Local B. The third local area Local C may be selected as a remaining area in the display panel 110 that does not correspond to the first local area Local A and the second local area Local B.

[0222] During the display driving period DP, a third uplink signal Uplink_P3 having a DC phase may be supplied to the third local domain Local C.

[0223] In this manner, during the display driving period DP, when a first uplink signal Uplink_P1 of a first phase is supplied through a touch electrode of a first local area Local A, a second uplink signal Uplink_P2 of a second phase is supplied through a touch electrode of a second local area Local B, and a third uplink signal Uplink_P3 of a DC phase is supplied through a touch electrode of a third local area Local C, crosstalk formed on a data line perpendicular to the touch electrode to which the uplink signal is applied can be cancelled out, thereby preventing degradation of image quality such as bright lines or dark lines.

[0224] FIG. 17 is an exemplary diagram illustrating a first local area, a second local area, and a third local area in a method for driving a touch display device according to an embodiment of the present disclosure.

[0225] Referring to FIG. 17, the method for driving a touch display device according to an embodiment of the present disclosure can detect the position of the stylus 200 based on the global uplink mode in the blank period BP.

[0226] For example, if the stylus 200 is detected to be located on the fourth X-touch electrode X-TE4, the first local area Local A may be selected as an area including the third X-touch electrode X-TE3 and the fifth X-touch electrode X-TE5 adjacent to the fourth X-touch electrode X-TE4.

[0227] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase can be supplied to a first local area Local A.

[0228] The second local area Local B may be selected with a size corresponding to the first local area Local A.

[0229] When the first local area Local A is selected as an area including three X-touch electrodes X-TE3, X-TE4, and X-TE5, the second local area Local B may also be selected as an area including three X-touch electrodes (e.g., X-TE2, X-TE6, and X-TE7).

[0230] In this case, a part of the second local area Local B may be selected above the first local area Local A, and another part may be selected below the first local area Local A.

[0231] For example, a second X-touch electrode X-TE2 may be selected in an upper portion adjacent to the first local area Local A, and a sixth X-touch electrode X-TE6 and a seventh X-touch electrode X-TE7 may be selected in a lower portion adjacent to the first local area Local A to form a second local area Local B.

[0232] During the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase may be supplied to the second local area Local B. The second phase may have an opposite phase to the first phase.

[0233] The third local area Local C may be selected as the remaining area excluding the first local area Local A and the second local area Local B.

[0234] For example, the third local region Local C may be selected as the first X touch electrode X-TE1 and the eighth X touch electrode X-TE8.

[0235] Meanwhile, the third local area Local C may be located between the first local area Local A and the second local area Local B.

[0236] During the display driving period DP, a third uplink signal Uplink_P3 having a DC phase may be supplied to the third local domain Local C.

[0237] FIG. 18 is a diagram comparing the change in driving current due to the method for driving a touch display device according to an embodiment of the present disclosure with the conventional method, and FIG. 19 is a diagram comparing the crosstalk due to the method for driving a touch display device according to an embodiment of the present disclosure with the conventional method.

[0238] 18, when an uplink signal having the same phase is applied to the entire display panel 110 during the display driving period DP, the deviation of the driving current Id flowing through the light emitting element is large depending on the vertical line on which the data line DL is arranged (case (a)).

[0239] In contrast, in the embodiment of the present disclosure, when a first uplink signal Uplink_P1 of a first phase is supplied through a touch electrode in a first local area during a display driving period DP, a second uplink signal Uplink_P2 of a second phase is supplied through a touch electrode in a second local area, and a third uplink signal Uplink_P3 of a DC phase is supplied through a touch electrode in a third local area Local C, crosstalk formed on a data line at a position intersecting with a touch electrode to which an uplink signal is applied can be cancelled out, and it can be confirmed that the deviation of the drive current Id flowing through the light-emitting element is reduced (case (b)).

[0240] Also, referring to FIG. 19, when an uplink signal having the same phase is applied to the entire display panel 110 during the display driving period DP, a bright line or a dark line may appear on the display panel 110 due to crosstalk formed on a data line at a position intersecting with a touch electrode to which the uplink signal is applied (case (a)).

[0241] In contrast, in the embodiment of the present disclosure, in the display driving period DP, a first uplink signal Uplink_P1 of a first phase is supplied through the touch electrode of the first local region, a second uplink signal Uplink_P2 of a second phase is supplied through the touch electrode of the second local region, and a third uplink signal Uplink_P3 of a DC phase is supplied through the touch electrode of the third local region Local C, whereby crosstalk formed on the data lines at positions intersecting with the touch electrodes to which the uplink signals are applied can be offset, thereby reducing the occurrence of bright or dark lines on the display panel 110 (case (b)).

[0242] The touch display device 100 of the present disclosure can also be applied to a self-capacitance type touch electrode structure. FIG. 1 is a schematic diagram illustrating a mutual capacitance-based touch electrode structure in a touch display device according to an embodiment of the present disclosure.

[0243] FIG. 20 is a simplified diagram of a self-capacitance based touch electrode structure in a touch display device according to an embodiment of the present disclosure.

[0244] Referring to FIG. 20, a touch display device 100 according to an embodiment of the present disclosure is a display device in which a touch screen panel TSP including a plurality of touch electrodes (TE) as touch sensors is built into a display panel 110, and may be a television (TV), a monitor, etc., or a mobile device such as a tablet or a smartphone.

[0245] For example, in the touch display device 100, a common electrode may be divided into a plurality of blocks and used as a plurality of touch electrodes TE. The plurality of touch electrodes TE may be arranged on the display panel 110 in a matrix form.

[0246] The display panel 110 may be various types of panels, such as a liquid crystal display panel, an organic light emitting display panel, or the like.

[0247] For example, when the display panel 110 is a liquid crystal display panel, the touch display device 100 may block a common electrode, to which a common voltage is applied and which forms an electric field with a pixel electrode, into a plurality of blocks and use the blocks as a plurality of touch electrodes TE.

[0248] As another example, when the display panel 110 is an organic light emitting display panel, the touch display device 100 may include a first electrode, an organic light emitting layer, a second electrode constituting an organic light emitting diode, an encapsulation layer located thereon and having an encapsulation function, and a touch sensor metal layer located thereon, and a plurality of touch electrodes TE may be formed on the touch sensor metal layer.

[0249] The touch display device 100 may include a touch circuit 150 that drives a display panel 110 having a built-in touch screen panel TSP to perform touch sensing and stylus sensing using signals received through the display panel 110.

[0250] Such a touch circuit 150 may include a touch drive circuit 152 that drives the display panel 110 and receives signals via the display panel 110, and a touch controller 154 that performs passive touch sensing (finger touch sensing) and active touch sensing using the signals received via the display panel 110.

[0251] The touch drive circuit 152 may be embodied as an integrated drive circuit together with a data drive circuit that drives the data lines DL.

[0252] The touch drive circuit 152 may be a COF (Chip On Film) type mounted on a film.

[0253] The film on which the touch driving circuit 152 is implemented can be coupled to each of the bonding portions of the display panel 110 and the bonding portions of the printed circuit board PCB.

[0254] The printed circuit board PCB may also be equipped with a touch controller 154 and the like.

[0255] The touch driving circuit 152 and the data driving circuit may be implemented as separate driving chips. The touch driving circuit 152 may be electrically connected to a plurality of touch electrodes TE forming the display panel 110 via a plurality of touch lines TL.

[0256] In the touch display device 100 of the present disclosure, a first local area Local A and a second local area Local B to which uplink signals of different phases are applied may be selected along a direction intersecting the data lines DL in order to reduce crosstalk due to coupling capacitance formed between touch electrodes TE intersecting the data lines DL.

[0257] The first local area Local A and the second local area Local B may extend along the touch electrode TE through which the uplink signal is transmitted and may be selected in a direction intersecting the data line DL. For example, the data line DL may extend in the second direction (e.g., the column direction), and the first local area Local A and the second local area Local B may be selected along the first direction (e.g., the row direction).

[0258] For example, if the global uplink mode determines during a blank period that the stylus is located in the first row, the area in which the touch electrodes in the first row arranged in the first direction (row direction) are located may be selected as the first local area Local A, and the area in which the touch electrodes in the second row adjacent to the first local area Local A are located may be selected as the second local area Local B.

[0259] Thereafter, during a display driving period, the device may operate in a local uplink mode in which a plurality of local uplink signals having different phases are supplied to a first local area Local A and a second local area Local B.

[0260] The above-described embodiment of the present disclosure can be briefly described as follows.

[0261] A touch display device according to an embodiment of the present disclosure includes a display panel including a plurality of touch electrodes, a drive circuit for driving the display panel, a touch circuit for detecting a position of the stylus using a downlink signal transmitted from the stylus, and a timing controller for controlling the drive circuit and the touch circuit, wherein the touch circuit operates in a global uplink mode for supplying a global uplink signal to the entire display panel during a blank period, and the touch circuit operates in a local uplink mode for supplying a plurality of local uplink signals having different phases to a plurality of regions during a display drive period.

[0262] The plurality of touch electrodes include a set of first touch electrodes extending in a first direction and arranged in a second direction intersecting the first direction, and a set of second touch electrodes extending in the second direction and arranged in the first direction, and the touch circuit provides the global uplink signal from the set of first touch electrodes to the entire first touch electrodes in the global uplink mode, and the touch circuit provides the global uplink signal from the set of first touch electrodes to the entire first touch electrodes in the local uplink mode. The plurality of local uplink signals can be provided from a set to the first touch electrodes respectively corresponding to the plurality of regions.

[0263] The global uplink signal may be provided in phase from the first set of touch electrodes to all of the first touch electrodes.

[0264] The first set of touch electrodes may extend in a direction perpendicular to the data lines.

[0265] The touch circuitry can detect a first local area corresponding to a position of the stylus based on a downlink signal transmitted from the stylus in the global uplink mode.

[0266] The display drive period can overlap with a touch drive period that detects a touch of the stylus.

[0267] The local uplink mode may include applying a first local uplink signal having a first phase to a first local region of the display panel that includes the position of the stylus, and applying a second local uplink signal having a second phase to a second local region different from the first local region.

[0268] The second phase may be an opposite phase to the first phase.

[0269] The first local area and the second local area may extend along a touch drive electrode in a mutual capacitance based touch electrode structure.

[0270] The second local region may be located on one side or both sides of the first local region.

[0271] The first local area and the second local area may have the same size.

[0272] The first local regions and the second local regions may be arranged in an alternating manner based on a position of the stylus.

[0273] In the local uplink mode, a third local uplink signal of a third phase may be applied to a third local area other than the first local area and the second local area.

[0274] The third phase may be a DC phase.

[0275] The third local region may be located outside the first local region or outside the second local region.

[0276] The plurality of touch electrodes include touch electrodes arranged in a matrix along a first direction and a second direction intersecting the first direction, and the touch circuit supplies the global uplink signal to all of the plurality of touch electrodes in the global uplink mode, and the touch circuit supplies the plurality of local uplink signals to first touch electrodes extending in a direction intersecting the data lines, respectively, in the local uplink mode.

[0277] The global uplink signal and the plurality of local uplink signals may include a beacon signal or a ping signal.

[0278] In addition, a method of driving a touch display device according to an embodiment of the present disclosure may include, in a method of detecting the position of a stylus in a touch circuit, a step of operating in a global uplink mode of supplying a global uplink signal to the entire display panel during a blank period, a step of determining the position of the stylus using a downlink signal transmitted from the stylus, and a step of operating in a local uplink mode of supplying multiple local uplink signals having different phases to multiple regions during a display driving period.

[0279] The global uplink mode may extend in a first direction intersecting with a data line and supply the global uplink signal to all first touch electrodes arranged in a second direction intersecting with the first direction.

[0280] The above description is merely an illustrative example of the technical concept of the present invention, and various modifications and variations are possible within the scope of the essential characteristics of the present invention, if one has ordinary knowledge in the technical field to which the present invention pertains. Furthermore, the embodiments disclosed in the present invention are intended to explain the technical concept of the present invention, rather than to limit it, and the scope of the technical concept of the present invention is not limited by such embodiments.

Claims

1. A display panel including a plurality of touch electrodes; A drive circuit for driving the display panel; A touch circuit that detects a position of the stylus on the display panel using a downlink signal transmitted from the stylus, supplies a global uplink signal to the entire display panel during a blank period in a global uplink mode, and supplies a plurality of local uplink signals having different phases to a plurality of regions during a display drive period in a local uplink mode; and A touch display device including the driving circuit and a timing controller for controlling the touch circuit.

2. The plurality of touch electrodes include a first set of touch electrodes extending in a first direction and arranged in a second direction intersecting the first direction; and a second set of touch electrodes extending in the second direction and arranged in the first direction; The touch circuitry includes: In the global uplink mode, providing the global uplink signal to all of the first touch electrodes of the first set of touch electrodes; 2. The touch display device of claim 1, further comprising: a first touch electrode connected to a first sub-electrode of the first touch electrode; a second sub-electrode of the first touch electrode connected to a first sub-electrode of the first touch electrode;

3. The touch circuitry includes: The touch display device of claim 2 , further comprising: a first touch electrode connected to the first touch electrode of the first set of touch electrodes, the first touch electrode being connected to the first touch electrode of the first set of touch electrodes, and a second touch electrode being connected to the first touch electrode of the first set of touch electrodes.

4. The first set of touch electrodes: The touch display device of claim 3 , wherein the driving circuitry is arranged to drive the data lines perpendicular to the data lines.

5. The touch circuitry includes: The touch display device of claim 1 , further comprising: detecting a first local area of ​​the display panel corresponding to a position of the stylus based on a downlink signal transmitted from the stylus in the global uplink mode.

6. The display driving period is The touch display device of claim 1 , wherein the touch circuitry overlaps with a touch drive period that detects the touch of the stylus on the display panel.

7. The touch circuitry includes: In the local uplink mode, providing a first local uplink signal having a first phase to a first local region of the display panel that includes a position of the stylus; The touch display device of claim 1 , further comprising: providing a second local uplink signal having a second phase to a second local region of the display panel different from the first local region.

8. The touch display device of claim 7 , wherein the second phase is opposite in phase to the first phase.

9. The touch display device of claim 7 , wherein the first local area and the second local area extend along touch driving electrodes of the plurality of touch electrodes in a mutual capacitance-based touch electrode structure of the display panel.

10. The touch display device of claim 7 , wherein the second local area is adjacent to one or both sides of the first local area.

11. The touch display device of claim 7 , wherein the first local area and the second local area have the same size.

12. The touch display device of claim 7 , wherein the first local regions and the second local regions are alternated based on a position of the stylus.

13. 8. The touch display device of claim 7, wherein the touch circuitry in the local uplink mode provides a third local uplink signal having a third phase to a third local region of the display panel different from the first local region and the second local region.

14. The touch display device of claim 13 , wherein the third phase is a DC phase.

15. The touch display device of claim 13 , wherein the third local area is located outside the first local area or outside the second local area.

16. The plurality of touch electrodes include touch electrodes arranged in a matrix along a first direction and a second direction intersecting the first direction, the display panel includes data lines extending in the second direction and driven by the driving circuit; The touch circuitry includes: In the global uplink mode, supplying the global uplink signal to all of the plurality of touch electrodes of the plurality of touch electrodes; In the local uplink mode, supplying a first local uplink signal to a first touch electrode of the plurality of touch electrodes included in a first local region of the display panel, and supplying a second local uplink signal to a second touch electrode of the plurality of touch electrodes included in a second local region of the display panel; the first local region and the second local region are adjacent to each other in the second direction, The touch display device of claim 1 , wherein the second local uplink signal is a signal generated by inverting the first local uplink signal.

17. The touch display device of claim 1 , wherein the global uplink signal and the plurality of local uplink signals include a beacon signal or a ping signal.

18. 1. A method of driving a touch display device to detect a position of a stylus relative to a display panel of the touch display device, comprising: providing a global uplink signal to the entire display panel by touch circuitry of the touch display device during a blank period while the touch circuitry operates in a global uplink mode; determining, by the touch circuitry, a position of the stylus using a downlink signal transmitted from the stylus in response to the global uplink signal; and 1. A method of driving a touch display device, comprising: providing, by the touch circuitry, a plurality of local uplink signals having different phases to a plurality of regions of the display panel during a display drive period while the touch circuitry operates in a local uplink mode.

19. A display panel including a plurality of touch electrodes; A drive circuit for driving the display panel; a touch circuit that supplies a global uplink signal to the entire display panel during a blank period, detects the presence or absence of the touch object based on a downlink signal transmitted from the touch object in response to the global uplink signal, supplies a first local uplink signal having a first phase to a first region of the display panel where the touch object is detected during a display driving period, and supplies a second local uplink signal having a second phase different from the first phase to a second region of the display panel while the first local uplink signal is applied to the first region; and A touch display device including a timing controller for controlling the driving circuit and the touch circuit.

20. The touch circuitry includes: supplying the global uplink signal to the plurality of touch electrodes during the blank period; providing the first local uplink signal to a first portion of the touch electrodes of the plurality of touch electrodes corresponding to the first region of the display panel during the display drive period; 20. The touch display device of claim 19, further comprising: providing the second local uplink signal from the plurality of touch electrodes to a second portion of the touch electrodes corresponding to the second region of the display panel during the display drive period.

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