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 having a plurality of touch electrodes; a driving circuit configured to drive the display panel; a touch circuit configured to detect a position of the stylus using a downlink signal transmitted from the stylus; and a timing controller configured to control the driving circuit and the touch circuit, in which the touch circuit operates in a global uplink mode that provides a global uplink signal to the entire display panel during a blanking period; and operate in a local uplink mode, providing a plurality of local uplink signals having different phases to the plurality of regions during the display driving period.

Description

Technical Field

[0001] 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 reducing image quality degradation caused by an uplink signal transmitted to a stylus pen. Background Art

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

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

[0004] In one example, a touch display device capable of recognizing a touch may include a plurality of touch electrodes disposed on or embedded in a display panel, and the touch electrodes may be driven to detect the presence of a user's touch on the display panel and the coordinates of the touch.

[0005] Such touch display devices are increasingly used not only in mobile devices such as smart phones and tablet PCs, but also in large-screen touch display devices such as automobile displays and exhibition displays.

[0006] In this case, the touch function on the touch display device may utilize not only a passive stylus such as a finger but also an active stylus that can transmit and receive signals to and from the display panel.

[0007] On the other hand, as touch display devices become lighter and thinner, touch electrodes and data lines located on a display panel are disposed more closely together.

[0008] As a result, in the process of transmitting an uplink signal from the display panel to the active stylus to communicate with the active stylus, the uplink signal may cause noise in the data voltage, which may deteriorate the image quality of the image displayed on the display panel. Summary of the invention

[0009] Therefore, the inventors of the present disclosure have disclosed a touch display device and a touch driving method capable of reducing image quality degradation caused by an uplink signal transmitted to an active stylus pen.

[0010] Embodiments of the present disclosure may provide a touch display device and a touch driving method, in which a global uplink mode is performed during a blanking period and a local uplink mode is performed during a display driving period, thereby reducing or minimizing a deviation of a data voltage caused by an uplink signal.

[0011] In addition, embodiments of the present disclosure may provide a touch display device and a touch driving method, wherein, in a local uplink mode, a touch driving signal having a first phase is applied to a first local area where an active stylus is located, and a touch driving signal having a second phase is applied to a second local area adjacent to the first local area, thereby compensating for the deviation of the data voltage caused by the touch driving signal.

[0012] An embodiment of the present disclosure may provide a touch display device, comprising: a display panel having multiple touch electrodes; a drive circuit configured to drive the display panel; a touch circuit configured to detect the position of a stylus using a downlink signal sent from the stylus; and a timing controller configured to control the drive circuit and the touch circuit, wherein the touch circuit operates in a global uplink mode of providing a global uplink signal to the entire display panel during a blanking period, and operates in a local uplink mode of providing multiple local uplink signals with different phases to multiple regions during a display drive period.

[0013] An embodiment of the present disclosure may provide a method for driving touch to detect the position of a stylus in a touch circuit, the method comprising the following steps: operating in a global uplink mode of providing a global uplink signal to the entire display panel during a blanking period; using a downlink signal sent from the stylus to determine the position of the stylus; and operating in a local uplink mode of providing multiple local uplink signals with different phases to multiple regions during a display drive period.

[0014] The embodiments of the present disclosure have the effect of reducing image quality degradation caused by an uplink signal transmitted to an active stylus pen, and can manufacture a light-weight touch display device.

[0015] Furthermore, the embodiments of the present disclosure have the effect of reducing or minimizing a data voltage deviation caused by an uplink signal by operating in a global uplink mode during a blanking period and operating in a local uplink mode during a display driving period.

[0016] In addition, an embodiment of the present disclosure has the following effect: by applying a touch drive signal with a first phase to a first local area where an active stylus is located in a local uplink mode, and applying a touch drive signal with a second phase to a second local area adjacent to the first local area, the deviation of the data voltage caused by the touch drive signal is compensated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a diagram showing a schematic configuration of a touch display device according to an embodiment of the present disclosure.

[0018] Figure 2 is a diagram showing a schematic configuration of a touch electrode structure based on mutual capacitance in a touch display device according to an embodiment of the present disclosure.

[0019] Figure 3 is a diagram showing an example of a sub-pixel circuit of a touch display device according to an embodiment of the present disclosure.

[0020] Figure 4 is a diagram showing an example of a touch driving period independent of a display driving period in a touch display device according to an embodiment of the present disclosure.

[0021] Figure 5 is a diagram illustrating an operation between a touch display device and a stylus pen according to an embodiment of the present disclosure.

[0022] Figure 6 is a diagram showing an example of touch drive timing between a touch display device and a stylus pen according to an embodiment of the present disclosure.

[0023] Figure 7 and Figure 8 is a diagram illustrating a concept of crosstalk generated by an uplink signal during a sensing process of a stylus pen.

[0024] Fig. 9 2 is a diagram showing a situation where bright lines or dark lines appear on a display panel due to crosstalk caused by an uplink signal.

[0025] Fig.10 is a flowchart illustrating a touch driving method according to an embodiment of the present disclosure.

[0026] Fig.11 is a diagram illustrating an operation state of a global uplink mode in a touch driving method according to an embodiment of the present disclosure.

[0027] Fig.12 is a diagram illustrating an operation state of a partial uplink mode in a touch driving method according to an embodiment of the present disclosure.

[0028] Fig.13 is a diagram showing an example of a first partial area and a second partial area in a touch driving method according to an embodiment of the present disclosure.

[0029] Fig.14 is a diagram showing another example of the first partial area and the second partial area in the touch driving method according to an embodiment of the present disclosure.

[0030] Fig.15 is a diagram showing another example of the first partial area and the second partial area in the touch driving method according to an embodiment of the present disclosure.

[0031] Fig.16 is a diagram illustrating an operation state of yet another partial uplink mode in a touch driving method according to an embodiment of the present disclosure.

[0032] Fig.17 is a diagram showing an example of a first partial area, a second partial area, and a third partial area in a touch driving method according to an embodiment of the present disclosure.

[0033] Fig.18 is a graph showing a change in driving current of a touch driving method according to an embodiment of the present disclosure compared with a conventional method.

[0034] Fig.19 is a graph showing a comparison result of crosstalk between a touch driving method according to an embodiment of the present disclosure and a conventional touch driving method.

[0035] Fig. 20 FIG. 4 is a diagram schematically showing a touch electrode structure based on self-capacitance in a touch display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In the following description of examples or embodiments of the present disclosure, reference will be made to the drawings, in which specific examples or embodiments that can be implemented are illustrated in a schematic manner, and in the drawings, the same reference numerals and symbols may be used to indicate the same or similar components, even if they are shown in different drawings from each other. In addition, in the following description of 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 unclear, the detailed description of the well-known functions and components incorporated herein will be omitted. Terms such as "including", "having", "containing", "consisting of", "consisting of" and "formed of" used herein are generally intended to allow the addition of other components, unless the term is 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.

[0037] 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 define the nature, order, sequence, quantity, etc. of the elements, but is only used to distinguish the corresponding element from other elements.

[0038] When it is mentioned that a first element is “connected or coupled”, “contacted or overlapped”, etc. with a second element, it should be interpreted that not only the first element can be “directly connected or coupled” or “directly contacted or overlapped” with the second element, but also a third element can be “interposed” between the first element and the second element, or the first element and the second element can be “connected or coupled”, “contacted or overlapped”, etc. with each other 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”, “contacted or overlapped”, etc. with each other.

[0039] When time-related terms such as “after,” “after,” “next,” “before,” etc. are used to describe a process or operation of an element or configuration, or a flow or step in an operation, process, or manufacturing method, these terms may be used to describe non-sequential or non-sequential processes or operations unless the terms “directly” or “immediately” are used together.

[0040] In addition, when any dimension, relative size, etc. is mentioned, the numerical value or corresponding information (e.g., degree, range, etc.) of the element or feature should be considered to include tolerances or error ranges that may be caused by various factors (e.g., process factors, internal or external impacts, noise, etc.), even when no relevant description is specified. In addition, the term "may" fully encompasses all meanings of the term "can".

[0041] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0042] Figure 1 is a diagram showing a schematic configuration of a touch display device according to an embodiment of the present disclosure.

[0043] 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.

[0044] The display panel 110 may include a display area DA in which an image is displayed and a non-display area NDA in which no image is displayed.

[0045] The non-display area NDA may be a peripheral area of ​​the display area DA, which may also be referred to as a frame area. The non-display area NDA may be an area visible from the front of the touch display device 100, or may be an area curved from the front of the touch display device 100 and not visible.

[0046] 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, a quantum dot display device, and the like.

[0047] 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, if the touch display device 100 is a self-luminous display device in which the sub-pixels SP are self-luminous, each sub-pixel SP may include a self-luminous light emitting device, one or more transistors, and one or more capacitors.

[0048] In addition, the display panel 110 may further include several different types of signal lines to drive the plurality of sub-pixels SP. For example, the various types of signal lines may include a plurality of data lines DL carrying data signals (also referred to as data voltages or image data), a plurality of gate lines GL carrying gate signals (also referred to as scan signals), and the like.

[0049] The plurality of data lines DL and the plurality of gate lines GL may intersect each other. Each of the plurality of gate lines GL may be disposed to extend in a first direction corresponding to a row direction. Each of the plurality of data lines DL may be disposed to extend in a second direction corresponding to a column direction.

[0050] Here, the first direction and the second direction are relative. For example, the first direction may be a horizontal direction, and the second direction may be a vertical direction. In another example, the first direction may be a vertical direction, and the second direction may be a horizontal direction.

[0051] 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 output gate signals to the plurality of gate lines GL.

[0052] The timing controller 140 is a device for controlling the data driving circuit 130 and the gate driving circuit 120, and may control driving timings of the plurality of data lines DL and driving timings of the plurality of gate lines GL.

[0053] The timing controller 140 may provide various types of data driving control signals DCS to the data driving circuit 130 to control the data driving circuit 130 , and provide various types of gate driving control signals GCS to the gate driving circuit 120 to control the gate driving circuit 120 .

[0054] The data driving circuit 130 may provide 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 the image data DATA in digital form from the timing controller 140, and may convert the received image data DATA into data signals in analog form and output them to the plurality of data lines DL.

[0055] The gate drive circuit 120 may provide a gate signal to a plurality of gate lines GL according to the timing control of the timing controller 140. A first gate voltage corresponding to an on-level voltage and a second gate voltage corresponding to an off-level voltage may be provided to the gate drive circuit 120 together with various gate drive control signals GCS to generate a gate signal, and the generated gate signal may be provided to a plurality of gate lines GL. Here, 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.

[0056] 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 object such as a finger or a pen has touched or detects a touch position to provide a touch sensing function in addition to an image display function.

[0057] 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 may use the touch sensing data to detect a touch occurrence or a touch position, etc.

[0058] 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 to the touch driving circuit 152. The touch screen panel or the touch electrodes TE are also referred to as touch sensors.

[0059] The touch screen panel may be outside the display panel 110, or may be inside the display panel 110. When the touch screen panel is outside the display panel 110, it is called an external touch screen panel. If the touch screen panel is an external touch screen panel, the touch screen panel and the display panel 110 may be manufactured and assembled separately. The external touch screen panel may include a substrate, a plurality of touch electrodes TE on the substrate, and the like.

[0060] If the touch screen panel exists inside the display panel 110, it is called an embedded touch screen panel. In the case of the embedded touch screen panel, the touch screen panel may be formed inside the display panel 110 during a manufacturing process of the display panel 110.

[0061] The touch driving circuit 152 may provide a touch driving signal to at least one of the plurality of touch electrodes TE, and may 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.

[0062] The touch circuit 150 may perform touch sensing in a self-capacitance manner or a mutual-capacitance manner.

[0063] If the touch circuit 150 performs touch sensing in a self-capacitance manner, the touch circuit 150 may perform touch sensing based on capacitance between each touch electrode TE and a touch object (eg, a finger, a pen, etc.).

[0064] If the touch circuit 150 performs touch sensing in a mutual capacitance manner, the touch circuit 150 may perform touch sensing based on capacitance between the touch electrodes TE.

[0065] 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 may drive the touch driving electrodes using touch driving signals and detect touch sensing signals from the touch sensing electrodes.

[0066] According to the self-capacitance scheme, each of the plurality of touch electrodes TE may function as a touch driving electrode as well as a touch sensing electrode. The touch driving circuit 152 may drive all or some of the plurality of touch electrodes TE, and may sense all or some of the plurality of touch electrodes TE.

[0067] The touch driving circuit 152 and the touch controller 154 may be implemented as separate devices, or may be implemented as a single device.

[0068] Alternatively, the touch driving circuit 152 and the data driving circuit 130 may be implemented as separate integrated circuits. Alternatively, all or a portion of the touch driving circuit 152 and all or a portion of the data driving circuit 130 may be integrated with each other and implemented as a single integrated circuit.

[0069] The touch display device 100 according to an embodiment of the present disclosure may be a self-luminous display device, such as an organic light-emitting display device, a quantum dot display device, a micro LED display device, etc., in which the self-luminous light-emitting device is disposed on the display panel 110 .

[0070] Figure 2is a diagram schematically showing a touch electrode structure based on mutual capacitance in a touch display device according to an embodiment of the present disclosure.

[0071] Reference Figure 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 top of the encapsulation layer.

[0072] Each of the plurality of X touch electrodes X-TE may be disposed in a first direction, and each of the plurality of Y touch electrodes Y-TE may be disposed in a second direction different from the first direction.

[0073] 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. In addition, the first direction and the second direction may be orthogonal or non-orthogonal to each other. In addition, as described herein, rows and columns are relative, and rows and columns may be interchanged depending on the viewing angle.

[0074] Each of the plurality of X touch electrodes X-TE may include a plurality of electrically connected X touch electrode portions. Each of the plurality of Y touch electrodes Y-TE may include a plurality of electrically connected Y touch electrode portions.

[0075] Here, the plurality of X touch electrodes X-TE and the plurality of Y touch electrodes Y-TE are electrodes included in the plurality of touch electrodes TE and have different roles (functions). For example, the plurality of X touch electrodes X-TE may be touch drive 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 drive electrodes.

[0076] The plurality of touch lines TL may include one or more X touch lines X-TL connected to each of the plurality of X touch electrodes X-TE, and one or more Y touch lines Y-TL connected to each of the plurality of Y touch electrodes Y-TE.

[0077] The touch circuit 150 may provide a touch driving signal to the X touch electrode X-TE via the X touch line X-TL, and receive a touch sensing signal generated by the Y touch electrode Y-TE via the Y touch line Y-TL.

[0078] Figure 3 is a diagram showing a sub-pixel circuit of a touch display device according to an embodiment of the present disclosure.

[0079] Reference Figure 3 , the 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 diode ED.

[0080] Here, the light emitting diode ED may be a self-luminous light emitting diode, such as an organic light emitting diode (OLED).

[0081] In the subpixel SP according to an 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. In addition, the first switching transistor T1 and the fifth switching transistor T5 may be N-type transistors.

[0082] P-type transistors are relatively more reliable than N-type transistors. In the case of a P-type transistor, since the source can be fixed at a high potential driving voltage VDD during light emission, it is advantageous that the current flowing through the light emitting diode ED does not fluctuate due to the capacitor Cst. Therefore, it is easy to provide a stable current.

[0083] Since the P-type transistor is connected to the anode of the light emitting diode ED, the P-type transistor can deliver a constant current regardless of a change in a threshold voltage when operating in a saturation region, and thus the P-type transistor is relatively reliable.

[0084] In this sub-pixel SP structure, the N-type transistors T1 and T5 may be made of oxide transistors formed using an oxide semiconductor (e.g., transistors having a channel formed of an oxide semiconductor such as indium, gallium, zinc oxide, or IGZO), and the other P-type transistors DRT, T2 to T4, and T6 may be silicon transistors formed of a semiconductor such as silicon (e.g., transistors having a polysilicon channel formed using a low-temperature process called LTPS or low-temperature polysilicon).

[0085] Since oxide transistors are characterized by relatively lower leakage current than silicon transistors, implementing the transistor using oxide transistors has the effect of reducing or preventing leakage current from the gate of the drive transistor DRT, thereby reducing image quality defects such as flicker.

[0086] On the other hand, except for the first switch transistor T1 and the fifth switch transistor T5 corresponding to the N-type transistors, the remaining P-type transistors DRT, T2 to T4 and T6 may be made of low temperature polysilicon.

[0087] Depending on the input voltage, the source and drain of the switching transistor described below may be referred to as a drain and a source, respectively.

[0088] The first scan signal SCAN1 is provided to the gate of the first switch transistor T1. The drain of the first switch transistor T1 is connected to the gate of the drive transistor DRT.

[0089] The source of the first switch transistor T1 is connected to the drain of the drive transistor DRT.

[0090] The first switching transistor T1 is turned on by the first scan signal SCAN1 to keep the gate voltage of the driving transistor DRT constant through the storage capacitor Cst, and a first terminal of the storage capacitor Cst is fixed to the high voltage driving voltage VDD.

[0091] The first switch transistor T1 may include an N-type MOS transistor to form an oxide transistor. Since the N-type MOS transistor uses electrons instead of holes as carriers, the N-type MOS transistor has a faster mobility than the P-type MOS transistor, and thus may have a faster switching speed.

[0092] The second scan signal SCAN2 is provided to the gate of the second switch transistor T2. The data voltage Vdata or the bias voltage VOBS may be provided to the source of the second switch transistor T2. The drain of the second switch transistor T2 is connected to the source of the drive transistor DRT.

[0093] The second switch transistor T2 is turned on by the second scan signal SCAN2 to provide the data voltage Vdata to the source of the driving transistor DRT.

[0094] The light emitting signal EM is supplied to the gate of the third switching transistor T3. The high voltage driving voltage VDD is supplied to the source of the third switching transistor T3. The drain of the third switching transistor T3 is connected to the source of the driving transistor DRT.

[0095] The third switch transistor T3 is turned on by the light emitting signal EM to provide the high potential driving voltage VDD to the source of the driving transistor DRT.

[0096] The light emitting signal EM is provided to the gate of the fourth switch transistor T4. The source of the fourth switch transistor T4 is connected to the drain of the drive transistor DRT. The drain of the fourth switch transistor T4 is connected to the anode of the light emitting diode ED.

[0097] The fourth switch transistor T4 is turned on by the light emitting signal EM to provide a driving current to the anode of the light emitting diode ED.

[0098] The third scan signal SCAN3 is provided to the gate of the fifth switching transistor T5.

[0099] Here, the third scan signal SCAN3 may be the first scan signal SCAN1 provided to the sub-pixel SP at a different position. For example, if the first scan signal SCAN1 is applied to the nth gate line, the third scan signal SCAN3 may utilize 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. In other words, the third scan signal SCAN3 may utilize the first scan signal SCAN1 to change the gate line GL according to the phase of driving the display panel 110.

[0100] The regulated voltage Vini is supplied to the drain of the fifth switching transistor T5. The source of the fifth switching transistor T5 is connected to the gate of the driving transistor DRT and the storage capacitor Cst.

[0101] The fifth switch transistor T5 is turned on by the third scan signal SCAN3 to provide the stable voltage Vini to the gate of the driving transistor DRT.

[0102] The fourth scan signal SCAN4 is provided to the gate of the sixth switching transistor T6.

[0103] Here, the fourth scan signal SCAN4 may be the second scan signal SCAN2 provided to the sub-pixel SP at a different position. For example, if the second scan signal SCAN2 is applied to the nth gate line GL, the fourth scan signal SCAN4 may be the second scan signal SCAN2 applied to the n-1th gate line GL. In other words, the fourth scan signal SCAN4 may change the gate line GL according to the phase of driving the display panel 110 using the second scan signal SCAN2.

[0104] The reset voltage VAR is supplied to the source of the sixth switch transistor T6. The drain of the sixth switch transistor T6 is connected to the anode of the light emitting diode ED.

[0105] The sixth switch transistor T6 is turned on by the fourth scan signal SCAN4 to provide the reset voltage VAR to the anode of the light emitting diode ED.

[0106] The gate of the driving transistor DRT is connected to the drain of the first switching transistor T1 , and the source of the driving transistor DRT is connected to the drain of the second switching transistor T2 .

[0107] The driving transistor DRT is turned on by a voltage difference between the gate and the source, so that a driving current is applied to the light emitting diode ED.

[0108] The source and drain of the first switching transistor T1 are respectively connected to the drain and gate of the driving transistor DRT, and can perform operations of sampling and compensating a threshold voltage of the driving transistor DRT by the data voltage Vdata applied to the source of the driving transistor DRT when the first switching transistor T1 is turned on.

[0109] A first electrode of the storage capacitor Cst is applied with the high potential driving voltage VDD, and a second electrode of the storage capacitor is connected to the gate of the driving transistor DRT. The storage capacitor Cst stores the voltage of the gate of the driving transistor DRT.

[0110] The anode of the light emitting diode ED is connected to the drain of the fourth switching transistor T4 and the drain of the sixth switching transistor T6. The low potential driving voltage VSS is applied to the cathode of the light emitting diode ED.

[0111] The light emitting diode ED emits light at a predetermined brightness by a driving current flowing through the driving transistor DRT.

[0112] At this time, the stabilization voltage Vini is provided to stabilize the variation of the capacitance formed on the gate of the driving transistor DRT, and the reset voltage VAR is provided to reset the anode of the light emitting diode ED.

[0113] When the reset voltage VAR is supplied to the anode of the light emitting diode ED by the fourth switching transistor T4 located between the anode of the light emitting diode ED and the driving transistor DRT and controlled by the emission signal EM, the anode of the light emitting diode ED may be reset.

[0114] The sixth switch transistor T6 providing the reset voltage VAR is connected to the anode of the light emitting diode ED.

[0115] The third scan signal SCAN3 for driving the driving transistor DRT or initializing the driving transistor DRT and the fourth scan signal SCAN4 for controlling the reset voltage VAR to be provided to the anode of the light emitting diode ED are separated from each other, so that the operation of driving the driving transistor DRT and the operation of resetting the anode of the light emitting diode ED can be performed separately.

[0116] At this time, the sub-pixel SP can be configured so that when the switching transistors T5 and T6 providing the stable voltage Vini and the reset voltage VAR are turned on, the fourth switching transistor T4 connecting the drain of the driving transistor DRT and the anode of the light-emitting diode ED is turned off to prevent the driving current of the driving transistor DRT from flowing to the anode of the light-emitting diode ED, and the anode is not affected by any voltage except the reset voltage VAR.

[0117] As such, the sub-pixel SP consisting of seven transistors DRT, T1, T2, T3, T4, T5, and T6 and one storage capacitor Cst may be referred to as a 7T1C structure.

[0118] The 7T1C structure shown here is an example of a sub-pixel SP circuit of various structures, and the structure and number of transistors and capacitors constituting the sub-pixel SP may be changed. Each of the plurality of sub-pixels SP may have the same structure, or some of the plurality of sub-pixels SP may have different structures.

[0119] The touch display device 100 according to an 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 the display driving operation and the touch driving operation.

[0120] In the case of sensing a touch of a user's finger, it may be effective to alternate the display drive operation and the touch drive operation.

[0121] 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 that can send and receive signals to and from the display panel 110, performing a touch driving period independently of a display driving period may be effective.

[0122] Figure 4 is a diagram showing an example of performing a touch driving period independent of a display driving period in a touch display device according to an embodiment of the present disclosure.

[0123] Reference Figure 4 , the touch display device 100 according to the embodiment of the present disclosure may perform the display driving operation and the touch driving operation in different time periods, but may also perform the display driving operation and the touch driving operation at the same time.

[0124] Therefore, the touch sync signal Tsync may be used to distinguish the display driving period DP from the touch driving period TP, or the touch sync signal Tsync may only identify and indicate the touch driving period TP.

[0125] For example, 16 touch driving periods TP1 to TP16 may be one touch frame period. Here, the touch frame period may refer to a time period during which a touch of the stylus pen may be sensed once on the entire screen area.

[0126] Although it is illustrated here that the touch driving operation is performed in the high level portion of the touch synchronization signal Tsync, the touch driving operation may also be performed in the low level portion of the touch synchronization signal Tsync. The display driving operation and the touch driving operation may occur simultaneously or in a time-division manner.

[0127] In some of the touch driving periods TP1 to TP16 constituting the touch frame, a finger touch driving operation may be performed to sense a finger touch, and in some other periods, a pen touch driving operation may be performed to sense a stylus pen touch.

[0128] Figure 5 is a diagram illustrating an example operation between a touch display device and a stylus pen according to an embodiment of the present disclosure.

[0129] Reference Figure 5 According to an embodiment of the present disclosure, the touch display device 100 can send an uplink signal including various information for controlling the driving of the stylus pen 200 or various information required for the driving of the stylus pen 200 to the stylus pen 200 via a transmitting circuit during a touch driving period for sensing the touch of the stylus pen.

[0130] More specifically, the touch circuit 150 provides the uplink signal to one or more of the plurality of touch electrodes TE included in the display panel 110 .

[0131] Therefore, the stylus pen 200 approaching the display panel 110 may receive the uplink signal via the tip of the stylus pen. That is, the stylus pen 200 may receive the uplink signal via one or more of the plurality of touch electrodes TE included in the display panel 110.

[0132] In response to the uplink signal transmitted from the touch display device 100 , the stylus pen 200 outputs a downlink signal indicating the position, tilt, or various additional information of the stylus pen 200 .

[0133] The downlink signal output from the stylus pen 200 may be applied to the touch electrode TE of the display panel 110 .

[0134] The touch circuit 150 of the touch display device 100 may receive a downlink signal output from the stylus pen 200 via the touch electrode TE, and may acquire a position, a tilt, and various additional information of the stylus pen 200 based on the received downlink signal.

[0135] Here, the uplink signal may include, for example, a beacon signal or a ping signal.

[0136] The beacon signal is a control signal for the touch display device 100 to control driving of the stylus pen 200 or to notify the stylus pen 200 of necessary information, and may include various information required for driving of the stylus pen 200 .

[0137] For example, the beacon signal may include one or more of basic information of the display panel 110 (e.g., status information, identification information, in-box type, etc.), information about the driving mode of the display panel 110 (e.g., mode identification information about the display mode, stylus search mode, etc.), information about the characteristics of the downlink signal (e.g., frequency, pulse count, etc.), information about driving timing, information about driving of the multiplexer, information about the power mode (e.g., an operating mode for lower power consumption, etc.), and may also include information for synchronization between the display panel 110 and the stylus 200.

[0138] The ping signal may be a control signal for downlink signal synchronization.

[0139] 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 checking and correcting information errors.

[0140] Figure 6 is a diagram showing touch drive timing between a touch display device and a stylus pen according to an embodiment of the present disclosure.

[0141] Here, it is shown that 16 touch driving periods TP1 to TP16 are regularly repeated. In this case, the 16 touch driving periods TP1 to TP16 may be referred to as one touch frame period. In this case, one touch frame period may include a finger touch driving period in which a finger touch may be sensed.

[0142] If the touch driving operation of the stylus pen 200 occurs simultaneously with the display driving operation, one touch frame period may correspond to one frame period in which the display driving operation occurs. Alternatively, a plurality of touch frame periods may be included in one frame period.

[0143] Also shown here are downlink signals output from the stylus pen 200 according to timing predetermined by the protocol and various uplink signals provided by the touch circuit 150 to the display panel 110 .

[0144] Reference Figure 6During one touch frame period corresponding to the 16 touch drive periods TP1 to TP16, a beacon signal as one of the uplink signals may be sent from the display panel 110 to the stylus 200 at least once or twice, and a transmission period of the beacon signal may be one or two or more touch drive periods (e.g., TP1) predetermined by a protocol among the 16 touch drive periods TP1 to TP16.

[0145] Alternatively, the beacon signal may be periodically transmitted every other touch frame period, or the beacon signal may be periodically transmitted every two or more touch frame periods, or the beacon signal may be transmitted in a random touch frame period based on the occurrence of a predetermined event.

[0146] If a beacon signal is transmitted from the display panel 110 to the stylus 200, the stylus 200 may output a downlink signal in response to the beacon signal during a predetermined touch driving period (here, TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) according to a predetermined protocol.

[0147] The downlink signal output from the stylus pen 200 may be a downlink signal that allows the touch display device 100 to sense the coordinates (position) and tilt of the stylus pen 200 .

[0148] In addition, the downlink signal output from the stylus pen 200 may be a downlink signal representing data including various additional information about the stylus pen 200. The data may include, for example, pressure, ID, button information, battery information, information for error checking and correction, and the like.

[0149] The downlink signal output from the stylus pen 200 may be applied to one or more of the plurality of touch electrodes TE included in the display panel 110 .

[0150] The sixteen touch driving periods TP1 to TP16 included in one touch frame period may include one or more touch driving periods (eg, TP2, TP5, TP9, TP13) for sensing one or more of the coordinates and the tilt of the stylus pen.

[0151] In response to the touch driving periods (eg, TP2, TP5, TP9, TP13), the stylus 200 may output downlink signals associated with sensing one or more coordinates and tilt.

[0152] In this case, the downlink signal may be a signal composed of pulses that periodically swing between a high level and a low level.

[0153] Sixteen touch driving periods TP1 to TP16 included in one touch frame period may include one or more touch driving periods (eg, TP3 , TP6 , TP7 , TP14 , TP15 ) during which data may be sensed.

[0154] In response to the touch driving periods (eg, TP3, TP6, TP7, TP14, TP15), the stylus pen 200 may output a downlink signal associated with data sensing.

[0155] In this case, the downlink signal may be a signal composed of non-periodic pulses representing additional information contained in the data.

[0156] As described above, when a downlink signal is output from the stylus pen 200 according to the touch driving period defined by the protocol, the touch circuit 150 may receive the downlink signal via the display panel 110 and perform a sensing process on the stylus pen 200 based on the received downlink signal.

[0157] Here, the pen sensing process may include one or more of sensing coordinates of the stylus pen 200 , sensing a tilt of the stylus pen 200 , and recognizing additional information of the pen contained in data.

[0158] On the other hand, sixteen touch driving periods TP1 to TP16 included in one touch frame period may include one or more touch driving periods (eg, TP4, TP8, TP10, TP11, TP12, TP16) for sensing a finger touch.

[0159] During these one or more touch driving periods (e.g., TP4, TP8, TP10, TP11, TP12, TP16), the touch circuit 150 may provide a touch driving signal TDS for sensing a finger touch to all or some of the plurality of touch electrodes TE included in the display panel 110.

[0160] Such a touch driving signal TDS may be a signal swinging between a high level and a low level. That is, the touch driving signal TDS may be a modulated signal having a variable voltage level.

[0161] On the other hand, in a touch driving period (e.g., TP1, TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) for sensing a pen touch, for other touch driving periods (e.g., TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) different from the touch driving period corresponding to the beacon signal transmission period (e.g., TP1), the touch circuit 150 may provide a DC voltage with a constant voltage level to the display panel 110.

[0162] Here, the DC voltage may be a low level voltage, such as a touch drive signal, a beacon signal, etc., or a high level voltage, or any voltage between the low level voltage and the high level voltage, or a ground voltage.

[0163] The touch driving operation for sensing the touch of the stylus pen 200 performed during the stylus pen touch driving period (e.g., TP1, TP2, TP3, TP5, TP6, TP7, TP9, TP13, TP14, TP15) may be referred to as a stylus pen touch driving operation. In addition, the touch driving operation performed during the finger touch driving period (e.g., TP4, TP8, TP10, TP11, TP12, TP16) for sensing the touch of a finger may be referred to as a finger touch driving operation.

[0164] The touch driving period TP may include only the stylus pen touch driving period, only the finger touch driving period, or a combination of the stylus pen touch driving period and the finger touch driving period.

[0165] In this case, if an uplink signal sent from the touch display device 100 to the stylus 200 is included in the display driving period, a coupling capacitor may be formed on the data line at the location where the data line intersects the touch electrode to which the uplink signal is applied, and crosstalk induced in the data voltage may result in bright or dark lines in the image.

[0166] The touch display device 100 of the present disclosure may transmit an uplink signal to the entire area of ​​the display panel in a blanking period during a pen touch driving period for stylus touch sensing, and then transmit the uplink signal in different phases according to the position of the stylus. On the other hand, during a finger touch driving period for finger touch sensing, a touch driving signal TDS may be sequentially provided to the touch electrodes provided on the display panel 110.

[0167] Figure 7 and Figure 8 is a diagram showing the concept of crosstalk generated by an uplink signal during sensing of a stylus pen, and Fig. 9 is a diagram showing an example of a case where a bright line or a dark line appears on a display panel due to crosstalk generated by an uplink signal.

[0168] Reference Figures 7 to 9 , the stylus pen touch driving period for sensing the stylus pen 200 on the touch display device 100 may be separated in time from the display driving period DP for displaying a video image, but may also overlap in time.

[0169] Here, a stylus touch driving period for stylus sensing will be described.

[0170] In this structure, if the stylus pen touch driving period overlaps the display driving period DP, the pulse-formed uplink signal supplied through the touch electrode TE during the display driving period DP causes ripples to be formed in the base voltage EVSS flowing through the cathode.

[0171] These ripples are most noticeable when the uplink signal transitions from low to high or from high to low.

[0172] The ripple voltage formed on the cathode causes crosstalk to occur on the data line DL at a position where the data line intersects the touch electrode, causing a bright line or a dark line to appear at a position corresponding to the uplink signal.

[0173] The touch display device 100 of the present disclosure can operate in a global uplink mode and a local uplink mode. In the global uplink mode, an uplink signal is sent to the entire area of ​​the display panel 110 in the blanking period BP, and in the local uplink mode, uplink signals with different phases are sent in the display driving period DP according to the detected position of the stylus, thereby reducing crosstalk caused by the uplink signal and improving the image quality of the video image.

[0174] Fig.10 is a flowchart illustrating a touch driving method according to an embodiment of the present disclosure.

[0175] Reference Fig.10 , the touch driving method according to an embodiment of the present disclosure may include a stage S100 of operating in a global uplink mode during a blanking period BP, a stage S200 of determining a position of the stylus 200, and a stage S300 of operating in a local uplink mode based on the position of the stylus 200 during a display driving period DP.

[0176] Phase S100 of operating in the global uplink mode during the blanking period BP is a process of transmitting an uplink signal to the stylus pen 200 through the entire area of ​​the display panel 110 during the blanking period BP, in which a video image is not displayed during one frame period.

[0177] In the global uplink mode, an uplink signal provided to the entire area of ​​the display panel 110 during the blank period BP may have the same phase.

[0178] The blanking period BP is an interval within a frame during which a video image is not displayed. Therefore, even if an uplink signal is supplied to the entire area of ​​the display panel 110 during the blanking period BP, image quality is not degraded due to the uplink signal.

[0179] Fig.11is a diagram illustrating an example operation state of a global uplink mode in a touch driving method according to an embodiment of the present disclosure.

[0180] Reference Fig.11 , the touch driving method according to an embodiment of the present disclosure may provide an uplink signal in the form of a pulse to cover the entire area of ​​the display panel 110 during the blanking period BP.

[0181] Here, during the blank period BP, no data voltage Vdata is applied through the data line DL, and thus, the uplink signal provided during the blank period BP does not introduce crosstalk to the data voltage Vdata.

[0182] As a result, the position where the stylus pen 200 approaches and / or contacts the display panel 110 may be detected during the blanking period BP without any degradation in image quality, such as bright or dark lines.

[0183] The stage S200 of determining the position of the stylus pen 200 is a process of determining the position of the stylus pen 200 using a downlink signal transmitted from the stylus pen 200 .

[0184] In this case, the downlink signal transmitted from the stylus pen 200 may be transmitted in the blank period BP or may be transmitted in the display driving period DP.

[0185] The touch circuit 150 may detect the position of the stylus 200 or the proximity and / or contact of the stylus 200 to the approximate area of ​​the display panel 110 using the downlink signal from the stylus 200 .

[0186] Stage S300 of operating in a local uplink mode based on the position of the stylus 200 in the display driving period DP is a process of providing a first uplink signal with a first phase to a first local area based on the position of the stylus 200, and providing a second uplink signal with a second phase to a second local area based on the position of the stylus 200.

[0187] Fig.12 is a diagram illustrating an example operation state of a partial uplink mode in a touch driving method according to an embodiment of the present disclosure.

[0188] Reference Fig.12 , the touch display device 100 according to an embodiment of the present disclosure may operate in a partial uplink mode during the display driving period DP.

[0189] In the local uplink mode, the touch circuit 150 may 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 pen 200 detected in the global uplink mode.

[0190] 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 respectively can be formed along a direction crossing the data line DL to reduce crosstalk caused by coupling capacitance formed between touch electrodes crossing the data line DL.

[0191] The first local area Local A and the second local area Local B extend along the first touch electrode to which the uplink signal is applied.

[0192] The first touch electrodes extend or are arranged in a direction intersecting the data lines DL. For example, the data lines DL may extend in the second direction (eg, column direction), and the first touch electrodes may be arranged or extended in the first direction (eg, row direction).

[0193] The first local area Local A may include the first touch electrode on which the stylus pen 200 is detected. The first local area Local A may further include other first touch electrodes adjacent to the first touch electrode on which the stylus pen 200 is detected.

[0194] During the display driving period DP, the first uplink signal Uplink_P1 having the first phase is provided to the first local area Local_A.

[0195] The second local area Local B may include touch electrodes on which the stylus pen 200 is not located.

[0196] The second local area Local B may be selected to correspond to the size of the first local area Local A. In addition, the second local area Local B may be selected at a position adjacent to the first local area Local A, or may be selected at a position spaced apart from the first local area Local A at regular intervals. The second local area Local B may occupy the remaining area of ​​the display panel 110 not occupied by the first local area Local A.

[0197] During the display driving period DP, the second uplink signal Uplink_P2 having a second phase different from the first phase is provided to the second local area Local_B. The second phase may be opposite to the first phase.

[0198] In this way, if a first uplink signal Uplink_P1 having a first phase is provided through the touch electrode of the first local area during the display driving period DP, and a second uplink signal Uplink_P2 having a second phase is provided through the touch electrode of the second local area during the display driving period DP, then such inverted uplink signal can offset the crosstalk formed on the data line DL orthogonal to the touch electrode to which the uplink signal is applied, thereby reducing or preventing image quality degradation such as bright lines or dark lines.

[0199] Fig.13 is a diagram illustrating a first partial area and a second partial area in a touch driving method according to an embodiment of the present disclosure.

[0200] Reference Fig.13 , the touch driving method according to the embodiment of the present disclosure may detect the position of the stylus pen 200 based on the global uplink mode in the blanking period BP.

[0201] In the case of a mutual capacitance-based touch electrode structure, the display panel 110 may be provided with a plurality of X touch electrodes X- TE1 to X- TE8 to which touch driving signals are applied and a plurality of Y touch electrodes Y- TE1 to Y- TE6 to which touch sensing signals are transmitted.

[0202] For example, if it is detected that the stylus pen 200 is 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 .

[0203] This shows a case where the first local area Local A is selected as an area including the second X touch electrode X- TE2 and the fourth X touch electrode X- TE4 adjacent to the third X touch electrode X- TE3 on which the stylus pen 200 is placed.

[0204] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase may be provided to the first local area Local_A.

[0205] The second local area Local B may be selected to have a size corresponding to the first local area Local A.

[0206] If 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 (eg, X-TE5, X-TE6, X-TE7).

[0207] A more precise position of the stylus pen 200 may be detected through the first uplink signal Uplink_P1 provided to the first local area Local A.

[0208] The second local area LocalB may be selected at a position adjacent to or spaced apart from the first local area LocalA.

[0209] During the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase may be provided to the second local area Local_B. The second phase may be opposite to the first phase.

[0210] Fig.14 is a diagram showing another example of the first partial area and the second partial area in the touch driving method according to an embodiment of the present disclosure.

[0211] Reference Fig.14 , the touch driving method according to the embodiment of the present disclosure may detect the position of the stylus pen 200 based on the global uplink mode in the blanking period BP.

[0212] For example, if the stylus pen 200 is detected as being located on the third X touch electrode X- TE3 , the first local area Local A may be selected as an area including the second X touch electrode X- TE2 and the fourth X touch electrode X- TE4 adjacent to the third X touch electrode X- TE3 .

[0213] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase may be provided to the first local area Local_A.

[0214] The second local area Local B may be selected to have a size corresponding to the first local area Local A.

[0215] If the first local area Local A is selected as a region including three X touch electrodes X-TE2, X-TE3, and X-TE4, the second local area Local B may also be selected as a region including three X touch electrodes (eg, X-TE1, X-TE5, X-TE6).

[0216] In this case, the second local area Local B may be selected as a portion above the first local area Local A and another portion below the first local area Local A.

[0217] For example, the first X touch electrode X-TE1 may be selected from an upper portion adjacent to the first local area Local A, and the fifth and sixth X touch electrodes X-TE5 and X-TE6 may be selected from a lower portion adjacent to the first local area Local A to form a second local area Local B.

[0218] During the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase may be provided to the second local area Local_B. The second phase may be opposite to the first phase.

[0219] Fig.15 is a diagram illustrating still another example of the first partial area and the second partial area in the touch driving method according to an embodiment of the present disclosure.

[0220] Reference Fig.15 , the touch driving method according to the embodiment of the present disclosure may detect the position of the stylus pen 200 based on the global uplink mode in the blanking period BP.

[0221] At this time, the first local area Local A and the second local area Local B may be selected alternately.

[0222] For example, if the stylus pen 200 is detected as being 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.

[0223] In addition, 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 the second local area Local B.

[0224] In addition, the third X touch electrode X- TE3 and the seventh X touch electrode X- TE7 serve as the first local area LocalA.

[0225] In this way, the first local area Local A and the second local area Local B may be selected to be alternately positioned around the position of the stylus pen 200 .

[0226] Also in this case, the first local area Local A and the second local area Local B are preferably selected to have substantially the same or identical size.

[0227] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase may be provided to the first local area Local_A.

[0228] Furthermore, during the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase may be provided to the second local area Local_B. The second phase may be opposite to the first phase.

[0229] On the other hand, in addition to the first local area Local A applying the first uplink signal Uplink_P1 with the first phase and the second local area LocalB applying the second uplink signal Uplink_P2 with the second phase, the touch driving method of the present disclosure may also include a third local area applying a third uplink signal with a DC phase.

[0230] Fig.16 is a diagram illustrating an operation state of another partial uplink mode in a touch driving method according to an embodiment of the present disclosure.

[0231] Reference Fig.16 , the touch display device 100 according to an embodiment of the present disclosure may operate in a partial uplink mode during the display driving period DP.

[0232] The local uplink mode may 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 pen 200 detected in the global uplink mode.

[0233] The first local area Local A, the second local area Local B, and the third local area Local C extend along the touch electrodes to which the uplink signal is transmitted.

[0234] The first local area Local A may be a touch electrode on which the stylus pen 200 is located, or may include a touch electrode adjacent to the touch electrode on which the stylus pen 200 is located.

[0235] During the display driving period DP, the first uplink signal Uplink_P1 having the first phase is provided to the first local area Local_A.

[0236] The second local area Local B may be selected from an area in which the stylus pen 200 is not located.

[0237] The second local area Local B may be selected to correspond to the size of the first local area Local A. Also, the second local area Local B may be selected at a position adjacent to the first local area Local A, or may be selected at a position spaced apart from the first local area Local A by a certain interval.

[0238] During the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase is provided to the second local area Local B. The second phase may be opposite to the first phase.

[0239] The third local area Local C may be selected from areas not corresponding to the first local area Local A and the second local area Local B. The third local area Local C may also be selected from the remaining areas of the display panel 110 not corresponding to the first local area Local A and the second local area Local B.

[0240] During the display driving period DP, the third local area Local C may be provided with a third uplink signal Uplink_P3 having a DC phase.

[0241] In this way, during the display driving period DP, if a first uplink signal Uplink_P1 having a first phase is provided via the touch electrode in the first local area Local A, and a second uplink signal Uplink_P2 having a second phase is provided via the touch electrode in the second local area Local B, and a third uplink signal Uplink_P3 having a DC phase is provided via the touch electrode in the third local area Local C, crosstalk formed on the data lines orthogonal to the touch electrodes to which the uplink signals are applied can be offset, thereby reducing or preventing image quality degradation such as bright lines or dark lines.

[0242] Fig.17 is a diagram illustrating a first partial area, a second partial area, and a third partial area in a touch driving method according to an embodiment of the present disclosure.

[0243] Reference Fig.17 , the touch driving method according to the embodiment of the present disclosure may detect the position of the stylus pen 200 based on the global uplink mode in the blanking period BP.

[0244] For example, if the stylus pen 200 is detected as being 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.

[0245] During the display driving period DP, a first uplink signal Uplink_P1 having a first phase may be provided to the first local area Local_A.

[0246] The second local area Local B may be selected to have a size corresponding to the first local area Local A.

[0247] If the first local area Local A is selected as a region including three X touch electrodes X-TE3, X-TE4, and X-TE5, the second local area Local B may also be selected as a region including three X touch electrodes (eg, X-TE2, X-TE6, X-TE7).

[0248] In this case, the second local area Local B may be selected as a portion above the first local area Local A and another portion below the first local area Local A.

[0249] For example, the second X touch electrode X-TE2 may be selected from an upper portion adjacent to the first local area Local A, and the sixth and seventh X touch electrodes X-TE6 and X-TE7 may be selected from a lower portion adjacent to the first local area Local A to form a second local area Local B.

[0250] During the display driving period DP, a second uplink signal Uplink_P2 having a second phase different from the first phase may be provided to the second local area Local_B. The second phase may be opposite to the first phase.

[0251] The third local area Local C may be selected as a region different from the first local area Local A and the second local area Local B.

[0252] For example, the third local area Local C may be selected as the first X touch electrode X- TE1 and the eighth X touch electrode X- TE8 .

[0253] Alternatively, the third local area Local C may be located between the first local area Local A and the second local area Local B.

[0254] During the display driving period DP, the third local area Local C may be provided with a third uplink signal Uplink_P3 having a DC phase.

[0255] Fig.18 is a diagram showing a change in driving current of a touch driving method according to an embodiment of the present disclosure compared with a conventional method, Fig.19 is a graph showing a comparison result of crosstalk between a touch driving method according to an embodiment of the present disclosure and a conventional method.

[0256] Reference Fig.18, if an uplink signal having the same phase is applied to the entire area of ​​the display panel 110 during the display driving period DP, a deviation of the driving current Id flowing through the light emitting diode greatly increases along a vertical line where the data line DL is set (in (a)).

[0257] On the contrary, as in an embodiment of the present disclosure, during the display drive period DP, if a first uplink signal Uplink_P1 having a first phase is provided via the touch electrode in the first local area, and a second uplink signal Uplink_P2 having a second phase is provided via the touch electrode in the second local area, and a third uplink signal Uplink_P3 having a DC phase is provided via the touch electrode in the third local area Local C, it can be seen that the deviation of the driving current Id flowing through the light emitting diode is reduced because the crosstalk formed on the data line at the position where the data line intersects the touch electrode to which the uplink signal is applied can be offset (in (b)).

[0258] In addition, refer to Fig.19 , if an uplink signal having the same phase is applied to the entire area of ​​the display panel 110 during the display driving period DP, bright lines or dark lines may appear on the display panel 110 due to crosstalk formed on the data line at the position where the data line intersects the touch electrode to which the uplink signal is applied (in (a)).

[0259] On the contrary, as in an embodiment of the present disclosure, during the display driving period DP, if a first uplink signal Uplink_P1 having a first phase is provided via the touch electrode in the first local area, and a second uplink signal Uplink_P2 having a second phase is provided via the touch electrode in the second local area, and a third uplink signal Uplink_P3 having a DC phase is provided via the touch electrode in the third local area Local C, the crosstalk formed on the data line at the position where the data line intersects the touch electrode to which the uplink signal is applied can be offset, thereby reducing the generation of bright lines or dark lines on the display panel 110 (in (b)).

[0260] The touch display device 100 disclosed in the present invention may also be applied to a self-capacitive touch electrode structure. Figure 2 is a diagram showing a schematic configuration of a touch electrode structure based on mutual capacitance in a touch display device according to an embodiment of the present disclosure.

[0261] Fig. 20 is a diagram showing a touch electrode structure based on self-capacitance in a touch display device according to an embodiment of the present disclosure.

[0262] Reference Fig. 20According to an embodiment of the present disclosure, the touch display device 100 may be a display device including a television (TV), a monitor, a mobile device such as a tablet or a smart phone, etc., in which a touch screen panel TSP including a plurality of touch electrodes TE as touch sensors is embedded in a display panel 110.

[0263] For example, the touch display device 100 may operate a common electrode block into a plurality of sub-blocks, and may use the sub-blocks as the touch electrodes TE. The plurality of touch electrodes TE may be disposed on the display panel 110 in a matrix form.

[0264] The display panel 110 may be any type of panel, such as a liquid crystal display panel, an organic light emitting display panel, etc.

[0265] In one example, if the display panel 110 is a liquid crystal display panel, the touch display device 100 may operate a common electrode block that forms an electric field with a pixel electrode when a common voltage is applied as a plurality of common electrode blocks and may use the blocks as a plurality of touch electrodes TE.

[0266] In another example, if the display panel 110 is an organic light-emitting display panel, the touch display device 100 may include an organic light-emitting diode, which includes a first electrode, an organic light-emitting layer, a second electrode, an encapsulation layer located on the second electrode and having a sealing function, and a touch sensor metal layer located on the encapsulation layer, wherein a plurality of touch electrodes TE may be formed on the touch sensor metal layer.

[0267] The touch display device 100 may include a touch circuit 150 that drives the display panel 110 in which the touch screen panel TSP is embedded to perform touch sensing and stylus sensing using a signal received via the display panel 110 .

[0268] Such a touch circuit 150 may include: a touch driving circuit 152 that drives the display panel 110 to receive a signal via the display panel 110; and a touch controller 154 that performs passive touch sensing (finger touch sensing) and active touch sensing using the signal received via the display panel 110.

[0269] The touch driving circuit 152 may be implemented as an integrated driving circuit having a data driving circuit that drives the data lines DL.

[0270] The touch driving circuit 152 may be a chip on film (COF) type.

[0271] The film on which the touch driving circuit 152 is mounted may be bonded to each of a bonding portion of the display panel 110 and a bonding portion of a printed circuit board (PCB).

[0272] A printed circuit board (PCB) may be mounted with the touch controller 154 and the like.

[0273] 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 via a plurality of touch electrodes TE and a plurality of touch lines TL to form a display panel.

[0274] The touch display device 100 of the present disclosure can select the first local area Local A and the second local area Local B to which uplink signals with different phases are applied along the direction in which the local area intersects the data line DL, so as to reduce crosstalk caused by coupling capacitance formed between the touch electrodes TE intersecting the data line DL.

[0275] The first local area Local A and the second local area Local B extend along the touch electrode TE to which the uplink signal is applied, and may be selected in a direction where the local area intersects the data line DL. For example, the data line DL may extend along 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).

[0276] For example, in the blanking period, if the global uplink mode determines that the stylus is located in the first row, the area where the first row of touch electrodes arranged along the first direction (row direction) are located can be selected as the first local area Local A, and the area where the second row of touch electrodes adjacent to the first local area Local A are located can be selected as the second local area Local B.

[0277] Then, a local uplink mode is performed in which a plurality of local uplink signals having different phases are provided to the first local area Local A and the second local area Local B during a display driving period.

[0278] The above-mentioned embodiments of the present disclosure will be briefly described below.

[0279] A touch display device according to an embodiment of the present disclosure includes a display panel having multiple touch electrodes, a driving circuit configured to drive the display panel, a touch circuit configured to detect the position of a stylus using a downlink signal sent from a stylus, and a timing controller configured to control the driving circuit and the touch circuit, wherein the touch circuit operates in a global uplink mode of providing a global uplink signal to the entire display panel during a blanking period, and operates in a local uplink mode of providing multiple local uplink signals with different phases to multiple regions during a display driving period.

[0280] The multiple touch electrodes may include each of a set of first touch electrodes extending in a first direction and arranged in a second direction intersecting the first direction, and each of a set of second touch electrodes extending in the second direction and arranged in the first direction, wherein the touch circuit provides the global uplink signal to all of the first touch electrodes in the global uplink mode, and wherein in the local uplink mode, the touch circuit provides the multiple local uplink signals to the first touch electrodes corresponding to the multiple areas, respectively.

[0281] The global uplink signal may be provided to all the first touch electrodes in the same phase.

[0282] The first touch electrodes may extend in a direction orthogonal to the data lines.

[0283] The touch circuit may detect a first local area corresponding to the position of the stylus based on a downlink signal transmitted from the stylus in the global uplink mode.

[0284] The display driving period may overlap with a touch driving period for detecting a touch of the stylus pen.

[0285] In the local uplink mode, a first local uplink signal having a first phase may be applied to a first local area including the stylus position, and a second local uplink signal having a second phase may be applied to a second local area different from the first local area.

[0286] The second phase may be opposite to the first phase.

[0287] The first local area and the second local area may extend along the touch driving electrodes in the mutual capacitance-based touch electrode structure.

[0288] The second partial area may be located on one side or both sides of the first partial area.

[0289] The first partial area and the second partial area may have the same or substantially the same size.

[0290] The first partial area and the second partial area may be alternately positioned relative to the position of the stylus.

[0291] In the local uplink mode, a third local uplink signal having a third phase may be applied to a third local area different from the first local area and the second local area.

[0292] The third phase may be a DC phase.

[0293] The third partial area may be located outside the first partial area or the second partial area.

[0294] The multiple touch electrodes may include touch electrodes arranged in a matrix form along a first direction and a second direction intersecting the first direction, wherein the touch circuit can provide a global uplink signal to the entire touch electrodes in a global uplink mode, and the touch circuit can provide multiple local uplink signals to the first touch electrodes extending in a direction intersecting the data lines in a local uplink mode.

[0295] The global uplink signal and the local uplink signal may include a beacon signal or a ping signal.

[0296] A touch driving method for detecting the position of a stylus in a touch circuit according to an embodiment of the present disclosure may include the following steps: operating in a global uplink mode in which a global uplink signal is provided to the entire display panel during a blanking period; determining the position of the stylus using a downlink signal sent from the stylus; and operating in a local uplink mode in which multiple local uplink signals with different phases are provided to multiple regions during a display driving period.

[0297] In the global uplink mode, the global uplink signal may be applied to each of all first touch electrodes extending in a first direction intersecting the data line and disposed in a second direction intersecting the first direction.

[0298] The above description is given to enable those skilled in the art to implement and use the technical ideas of the present disclosure, and is provided in the context of specific applications and their 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 ideas of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical ideas of the present disclosure.

[0299] CROSS-REFERENCE TO RELATED APPLICATIONS

[0300] This application claims priority to Korean Patent Application No. 10-2023-0090793 filed on Jul. 13, 2023, which is hereby incorporated by reference for all purposes as if fully set forth herein.

Claims

1. A touch display device, comprising: A display panel having a plurality of touch electrodes; a driving circuit configured to drive the display panel; A touch circuit, wherein the touch circuit is configured as follows: detecting a position of the stylus relative to the display panel using a downlink signal sent from the stylus, providing a global uplink signal to the entire display panel during a blanking period when operating in a global uplink mode, and providing a plurality of local uplink signals having different phases to a plurality of regions of the display panel during a display driving period when operating in a local uplink mode; as well as A timing controller is configured to control the driving circuit and the touch circuit.

2. The touch display device according to claim 1, wherein: The plurality of touch electrodes include: a set of first touch electrodes, each of which extends in a first direction and is arranged in a second direction intersecting the first direction; and a set of second touch electrodes, each second touch electrode in the set of second touch electrodes extending in the second direction and arranged in the first direction, Wherein, the touch circuit is further configured as: When operating in the global uplink mode, providing the global uplink signal to all of the first touch electrodes in the set of the first touch electrodes, and When operating in the local uplink mode, each of the plurality of local uplink signals is provided to a respective subset of the first touch electrodes of the set of first touch electrodes corresponding to respective areas of the plurality of areas.

3. The touch display device according to claim 2, wherein: The touch circuit is further configured to provide the global uplink signal of a single phase to all of the first touch electrodes in the set of the first touch electrodes.

4. The touch display device according to claim 3, wherein: The set of first touch electrodes extends in a direction orthogonal to the data lines driven by the driving circuit.

5. The touch display device according to claim 1, wherein: The touch circuit is further configured to, when operating in the global uplink mode, detect a first local area of ​​the display panel corresponding to a position of the stylus based on the downlink signal transmitted from the stylus.

6. The touch display device according to claim 1, wherein: The display driving period overlaps with a touch driving period in which the touch circuit detects a touch of the stylus pen at the display panel.

7. The touch display device according to claim 1, wherein: The touch circuit is further configured to, when operating in the local uplink mode, providing a first local uplink signal having a first phase to a first local area of ​​the display panel including a position of the stylus pen, and A second partial uplink signal having a second phase is provided to a second partial area of ​​the display panel different from the first partial area.

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

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

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

11. The touch display device according to claim 7, wherein: The first partial area and the second partial area have the same size.

12. The touch display device according to claim 7, wherein: The first partial area and the second partial area are alternately positioned relative to the position of the stylus.

13. The touch display device according to claim 7, wherein: The touch circuit is further configured to provide a third local uplink signal having a third phase to a third local area of ​​the display panel when operating in the local uplink mode, the third local area being different from the first local area and the second local area.

14. The touch display device according to claim 13, wherein: The third phase is a DC phase.

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

16. The touch display device according to claim 1, wherein: The plurality of touch electrodes include touch electrodes arranged in a matrix along a first direction and a second direction crossing the first direction, Wherein, the display panel further includes data lines extending along the second direction, and the data lines are driven by the driving circuit. The touch circuit is further configured to provide the global uplink signal to all the touch electrodes in the plurality of touch electrodes when operating in the global uplink mode. When operating in the local uplink mode, a first local uplink signal is provided to a first touch electrode among the plurality of touch electrodes, the first touch electrode being included in a first local area of ​​the display panel, and a second local uplink signal is provided to a second touch electrode among the plurality of touch electrodes, the second touch electrode being included in a second local area of ​​the display panel, wherein the first local area and the second local area are adjacent to each other with respect to the second direction, and The second local uplink signal is a signal generated by inverting the first local uplink signal.

17. The touch display device according to claim 1, wherein: The global uplink signal, the first local uplink signal or the second local uplink signal comprises a beacon signal or a ping signal.

18. A touch driving method for detecting a position of a stylus relative to a display panel of a touch display device, the touch driving method comprising the following steps: During a blanking period when the touch circuit of the touch display device operates in a global uplink mode, providing a global uplink signal to the entire display panel by the touch circuit; determining, by the touch circuitry in response to the global uplink signal, a position of the stylus using a downlink signal sent from the stylus; as well as During a display driving period when the touch circuit operates in the local uplink mode, a plurality of local uplink signals having different phases are provided by the touch circuit to a plurality of regions of the display panel.

19. A touch display device, comprising: A display panel having a plurality of touch electrodes; a driving circuit configured to drive the display panel; A touch circuit, wherein the touch circuit is configured as follows: providing a global uplink signal to the entire display panel during a blanking period, in response to the global uplink signal, sensing the presence of the touch object based on a downlink signal transmitted from the touch object, and During a display driving period, providing a first local uplink signal having a first phase to a first area of ​​the display panel where the presence of the touch object is sensed, and providing a second local uplink signal having a second phase different from the first phase to a second area of ​​the display panel while providing the first local uplink signal to the first area; as well as A timing controller is configured to control the driving circuit and the touch circuit.

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