Touch display device and touch driving method

Abstract

The touch display device includes: a display panel including a plurality of sub-pixels; a driving circuit configured to drive the display panel; and a timing controller configured to control a normal mode in which the image is displayed or a touch mode in which the image and the touch pattern are displayed according to a touch state of the stylus.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2023-0103848, filed on August 9, 2023, which is hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0003] Embodiments of the present disclosure relate to a touch display device and a touch driving method, and more particularly, to a touch display device and a touch driving method capable of detecting a touch without an infrared pattern layer. Background Art

[0004] The development of smart society has led to an increase in demand for various types of display devices. Various display devices are being used, such as liquid crystal displays, electroluminescent displays, or quantum dot light-emitting displays.

[0005] The display device recognizes a user's finger touch or a pen touch on a display panel and performs input processing based on the recognized touch to provide more diverse functions.

[0006] As an example, a display device capable of touch recognition may include a plurality of touch electrodes arranged or embedded in a display panel, and detect the presence of a user's touch on the display panel and the coordinates of the touch by driving the touch electrodes.

[0007] Such a touch display device is on the trend of being adopted by more industries, for example, for use in large-scale touch display devices such as vehicle displays and display displays, and for use in mobile devices such as smartphones or tablet computers.

[0008] In this case, a touch function for touching the display device may use not only a passive stylus such as a finger but also an active stylus capable of transmitting and receiving signals to and from the display panel. Summary of the invention

[0009] The inventors of the present disclosure have invented a touch display device and a touch driving method capable of detecting a touch without an infrared pattern layer.

[0010] Embodiments of the present disclosure may provide a touch display device and a touch driving method that facilitate touch detection by transmitting a touch pattern through a display panel.

[0011] Embodiments of the present disclosure may provide a touch display device and a touch driving method capable of achieving process optimization and light weight by not forming a separate infrared pattern layer on a display panel.

[0012] Embodiments of the present disclosure may provide a touch display device and a touch driving method capable of minimizing luminance variation and effectively detecting a touch by controlling a driving current according to a pattern period during which a touch pattern is emitted.

[0013] An embodiment of the present disclosure may provide a touch display device, comprising: a display panel including a plurality of sub-pixels; a driving circuit configured to drive the display panel; and a timing controller configured to control a normal mode of displaying an image or a touch mode of displaying an image and a touch pattern according to a touch state of a stylus pen.

[0014] An embodiment of the present disclosure may provide a touch driving method, the method comprising: a step of determining whether a stylus is touched; a step of operating in a normal mode for displaying an image when there is no touch of the stylus; a step of operating in a touch mode for displaying an image and a touch pattern when there is a touch of the stylus; a step of determining the coordinates of the stylus in the touch mode; and a step of tracking the touch position of the stylus.

[0015] According to an embodiment of the present disclosure, a touch may be detected without an infrared pattern layer.

[0016] According to an embodiment of the present disclosure, touch detection may also be facilitated by transmitting a touch pattern through a display panel.

[0017] According to an embodiment of the present disclosure, process optimization and lightweighting may also be achieved by not forming a separate infrared pattern layer on the display panel.

[0018] According to an embodiment of the present disclosure, it is also possible to minimize brightness variation and effectively detect a touch by controlling a driving current according to a pattern period during which a touch pattern is emitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a perspective view showing a touch sensing system according to an embodiment of the present disclosure;

[0021] Figure 2is a block diagram conceptually illustrating a stylus in a touch sensing system according to an embodiment of the present disclosure;

[0022] Figure 3 is a block diagram schematically illustrating a touch display device in a touch sensing system according to an embodiment of the present disclosure;

[0023] Figure 4 is a view showing an example of a circuit constituting a sub-pixel in a touch display device according to an embodiment of the present disclosure;

[0024] Figure 5 is a conceptual diagram showing a touch driving method according to an embodiment of the present disclosure;

[0025] Figure 6 is a diagram showing an operation process of a touch mode in a touch driving method according to an embodiment of the present disclosure;

[0026] Figure 7 is a signal flow showing a scan signal in a normal mode in a touch driving method according to an embodiment of the present disclosure;

[0027] Figure 8 is a signal flow showing a scan signal in a touch mode in a touch driving method according to an embodiment of the present disclosure;

[0028] Fig. 9 is a diagram showing a change in a driving current according to a width of a scan signal in a touch driving method according to an embodiment of the present disclosure;

[0029] Fig.10 is a diagram showing a touch pattern displayed in a touch display device according to an embodiment of the present disclosure;

[0030] Fig.11 is a diagram showing a touch pattern displayed in a touch period in a touch driving method according to an embodiment of the present disclosure;

[0031] Fig.12 is a diagram illustrating an operation when a touch period is included in every two frames in a touch driving method according to another embodiment of the present disclosure;

[0032] Fig.13 is a diagram showing a flow chart of a touch driving method according to an embodiment of the present disclosure;

[0033] Fig.14 is a diagram showing a flowchart of a touch driving method according to another embodiment of the present disclosure; and

[0034] Fig.15is a conceptual diagram illustrating a process of performing a global operation and a local operation in a touch driving method according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] 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 shown by way of illustration, and wherein, even when the same or similar parts are shown in different drawings from each other, the same reference numerals and symbols can be used to represent the same or similar parts. 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 parts incorporated herein will be omitted. Terms such as "including", "having", "including", "constituting", "consisting of" and "formed by" used herein are generally intended to allow the addition of other parts, unless these terms are used together with the term "only". As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form.

[0036] Terms such as "first", "second", "A", "B", "(A)" or "(B)" may be used herein to describe elements of the present disclosure. Each of these terms is not used to limit the nature, order, sequence or number of elements, etc., but is only used to distinguish the corresponding element from other elements.

[0037] When referring to a first element being "connected or coupled to", "contacting or overlapping", etc. a second element, it should be understood that not only the first element may be "directly connected or coupled to" or "directly contacting or overlapping" the second element, but also a third element may be "interposed" between the first and second elements, or the first and second elements may be "connected or coupled to", "contacting or overlapping", etc. each other via a fourth element. Here, the second element may be included in at least one of the two or more elements that are "connected or coupled to", "contacting or overlapping", etc. each other.

[0038] When time-related terms such as “after,” “subsequently,” “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 method of manufacture, these terms may be used to describe non-sequential or non-sequential processes or operations unless the terms “directly” or “immediately” are used together.

[0039] In addition, when referring to any dimension, relative size, etc., it should be considered that the numerical value or corresponding information (such as level, range, etc.) of the element or feature includes the tolerance or error range that may be caused by various factors (such as process factors, internal or external influences, noise, etc.), even if there is no relevant description. In addition, the term "may" fully encompasses all meanings of the term "can".

[0040] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0041] Figure 1 is a perspective view showing a touch sensing system according to an embodiment of the present disclosure. Figure 2 is a block diagram conceptually illustrating a stylus pen in a touch sensing system according to an embodiment of the present disclosure. Figure 3 is a block diagram schematically illustrating a touch display device in a touch sensing system according to an embodiment of the present disclosure.

[0042] Reference Figures 1 to 3 , a touch sensing system according to an embodiment of the present disclosure may include a touch display device 100 and a stylus pen 200 .

[0043] The stylus pen 200 may include an optical sensor 210 , a touch sensor 220 , a processor 230 , a communication module 240 , a memory 250 , and a battery 260 .

[0044] The stylus pen 200 may be a smart pen or an active pen capable of generating coordinate data using an optical method.

[0045] The optical sensor 210 may be placed in front of the stylus pen 200. The optical sensor 210 may detect a touch pattern emitted from the touch display device 100. The touch pattern emitted from the touch display device 100 may have a wavelength in a visible light band, or may have a wavelength in an infrared or ultraviolet band.

[0046] The optical sensor 210 may continuously detect a touch pattern at a corresponding position following the movement of the stylus pen 200 , and provide pattern information detected from the touch pattern to the processor 230 .

[0047] The touch sensor 220 may sense a state in which the stylus pen 200 approaches the touch display device 100 or is in contact with the touch display device 100. The touch sensor 220 may sense pressure applied by the stylus pen 200 to the touch display device 100, or may sense a change in capacitance when approaching or approaching the touch display device 100. The touch sensor 220 may provide pressure information of the stylus pen 200 to the processor 230. However, this is an example, and the touch sensor 220 may be replaced with a sensor element capable of detecting contact between the stylus pen 200 and the touch display device 100 and / or a situation in which the stylus pen 200 approaches the touch display device 100 to within a predetermined distance, and the like.

[0048] The processor 230 may receive at least one piece of pattern information from the optical sensor 210. The processor 230 may convert the pattern information into a data code and generate coordinate data using the data code.

[0049] In this case, the processor 230 can quickly generate coordinate data by converting the pattern information into a one-to-one corresponding data code without complicated calculation or correction. Therefore, the touch sensing system of the present disclosure can reduce power consumption and simplify driving operation.

[0050] The processor 230 may send the generated coordinate data to the touch display device 100 through the communication module 240 .

[0051] The communication module 240 may perform wired or wireless communication with an external device. For example, the communication module 240 may transmit and receive wired or wireless signals using a communication circuit of the touch display device 100.

[0052] The memory 250 may store data required for the driving operation of the stylus pen 200. Since the stylus pen 200 may convert pattern information into corresponding data codes and may directly provide coordinate data generated thereby to the touch display device 100, the stylus pen 200 may include the memory 250 having a capacity corresponding to one piece of infrared pattern information.

[0053] The touch display device 100 according to an embodiment of the present disclosure may include a display panel 110 and a driving circuit for driving the display panel 110 .

[0054] The display panel 110 may include a display area DA in which an image is displayed and a bezel area BA in which no image is displayed. The bezel area BA may also be referred to as a non-display area.

[0055] The display panel 110 may include a plurality of sub-pixels SP for displaying an image. For example, a plurality of sub-pixels SP may be disposed in the display area DA. In some cases, at least one sub-pixel SP may be disposed in the border area BA. At least one sub-pixel SP disposed in the border area BA is also referred to as a virtual sub-pixel.

[0056] The display panel 110 may include a plurality of signal lines for driving a plurality of sub-pixels SP. For example, the plurality of signal lines may include a plurality of data lines DL and a plurality of gate lines GL. Depending on the structure of the sub-pixels SP, the signal lines may further include other signal lines in addition to the plurality of data lines DL and the plurality of gate lines GL. For example, the other signal lines may include a driving voltage line and a reference voltage line.

[0057] A plurality of data lines DL and a plurality of gate lines GL may cross each other. Each of the plurality of data lines DL may be arranged while extending in a first direction. Each of the plurality of gate lines GL may be arranged while extending in a second direction. Here, the first direction may be a column direction, and the second direction may be a row direction. In the present disclosure, the column direction and the row direction are relative. For example, the column direction may be a vertical direction, and the row direction may be a horizontal direction. As another example, the column direction may be a horizontal direction, and the row direction may be a vertical direction.

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

[0059] The data driving circuit 130 is a circuit for driving a plurality of data lines DL, and can output a data signal (also referred to as a data voltage) corresponding to an image signal 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 generate a gate signal, and output the gate signal to the plurality of gate lines GL. The gate signal may include one or more scanning signals and light emitting signals.

[0060] The timing controller 140 may start scanning according to the timing implemented in each frame, and may control data driving at an appropriate time according to scanning. The timing controller 140 may convert input image data or touch image data supplied from the outside into a data signal format corresponding to that used by the data driving circuit 130, and supply the converted image data DATA to the data driving circuit 130.

[0061] The timing controller 140 may receive a display driving control signal and input image data from an external host system. For example, the display driving control signal may include a vertical synchronization signal, a horizontal synchronization signal, an input data enable signal, and a clock signal.

[0062] The timing controller 140 may generate a data drive control signal DCS and a gate drive control signal GCS based on a display drive control signal input from a host system. The timing controller 140 may control the driving operation and driving timing of the data drive circuit 130 by supplying the data drive control signal DCS to the data drive circuit 130. The timing controller 140 may control the driving operation and driving timing of the gate drive circuit 120 by supplying the gate drive control signal GCS to the gate drive circuit 120.

[0063] The timing controller 140 may provide image data to the data driving circuit 130 in the display period, and supply a touch pattern that can be recognized by the stylus pen 200 to the data driving circuit 130 in the pattern period.

[0064] The touch pattern displayed on the display panel 110 in the pattern period may be composed of encrypted patterns divided by regions, and the stylus pen 200 may generate coordinate data by detecting the touch pattern displayed on the display panel 110 in the pattern period.

[0065] The data driving circuit 130 may include one or more source driver integrated circuits SDIC. Each source driver integrated circuit may include a shift register, a latch circuit, a digital-to-analog converter (DAC), an output buffer, etc. In some cases, each source driver integrated circuit may also include an analog-to-digital converter (ADC).

[0066] For example, each source driver integrated circuit can be connected to the display panel 110 via a tape automated bonding (TAB) method, or connected to a bonding pad of the display panel 110 via a chip on glass (COG) method or a chip on panel (COP) method, or can be implemented and connected to the display panel 110 via a chip on film (COF) method.

[0067] The gate driving circuit 120 may output a gate signal of an on-level voltage or a gate signal of an off-level voltage according to control of the timing controller 140. The gate driving circuit 120 may sequentially drive the plurality of gate lines GL by sequentially supplying the gate signal of the on-level voltage to the plurality of gate lines GL.

[0068] The gate driving circuit 120 may include one or more gate driving integrated circuits GDIC.

[0069] The gate drive circuit 120 may be connected to the display panel 110 by a TAB method, or may be connected to a bonding pad of the display panel 110 by a COG or COP method, or may be connected to the display panel 110 according to a COF method. Alternatively, the gate drive circuit 120 may be formed in a gate-in-panel (GIP) type in a border area BA of the display panel 110. The gate drive circuit 120 may be disposed on a substrate or may be connected to a substrate. In other words, a GIP-type gate drive circuit 120 may be disposed in a border area BA of a substrate. A gate drive circuit 120 of a chip on glass (COG) type or a chip on film (COF) type may be connected to a substrate.

[0070] Meanwhile, at least one of the data driving circuit 130 and the gate driving circuit 120 may be disposed in the display area DA. For example, at least one of the data driving circuit 130 and the gate driving circuit 120 may be disposed not to overlap the subpixels SP or to overlap all or some of the subpixels SP.

[0071] The data driving circuit 130 may be connected to one side (e.g., the upper side or the lower side) of the display panel 110. The data driving circuit 130 may be connected to both sides (e.g., the upper side and the lower side) of the self-emissive display panel 110, or two or more sides of the four sides of the self-emissive display panel 110, according to a driving scheme or a panel design scheme.

[0072] The gate driving circuit 120 may be connected to one side (e.g., the left side or the right side) of the display panel 110. Depending on a driving scheme or a panel design scheme, the gate driving circuit 120 may be connected to both sides (e.g., the left side and the right side) of the display panel 110, or two or more sides of the four sides of the display panel 110.

[0073] The timing controller 140 may be implemented as a component separate from the data driving circuit 130, or the timing controller 140 and the data driving circuit 130 may be integrated into an integrated circuit (IC). The timing controller 140 may be a controller used in a typical display technology, or a control device that can perform other control functions as well as the function of the timing controller, or a circuit in a control device. The timing controller 140 may be implemented as various circuits or electronic components, such as an integrated circuit (IC), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a processor.

[0074] The timing controller 140 may be mounted on a printed circuit board or a flexible printed circuit, and may be electrically connected to the data driving circuit 130 and the gate driving circuit 120 through the printed circuit board or the flexible printed circuit. The timing controller 140 may send / receive signals to / from the data driving circuit 130 according to one or more predetermined interfaces. The interface may include, for example, a low voltage differential signaling (LVDS) interface, an embedded clock point-to-point (EPI) interface, or a serial peripheral interface (SPI).

[0075] The touch display device 100 according to an embodiment of the present disclosure may be a self-emitting display device in which the display panel 110 emits light by itself. When the touch display device 100 according to an embodiment of the present disclosure is a self-emitting display device, each of the plurality of sub-pixels SP may include a light-emitting element. For example, the touch display device 100 according to an embodiment of the present disclosure may be an organic light-emitting diode display in which the light-emitting element is implemented as an organic light-emitting diode (OLED).

[0076] As another example, the touch display device 100 according to an embodiment of the present disclosure may be an inorganic light-emitting display device in which the light-emitting element is implemented as a light-emitting diode based on an inorganic material. As another example, the touch display device 100 according to an embodiment of the present disclosure may be a quantum dot display device in which the light-emitting element is implemented as a quantum dot that is a self-emitting semiconductor crystal.

[0077] The timing controller 140 may perform wired / wireless communication with the stylus pen 200 through the communication circuit 150 .

[0078] The communication circuit 150 may transmit information about a touch pattern displayed on the display panel 110 in the pattern period to the stylus pen 200. In addition, the communication circuit 150 may receive coordinate data from the stylus pen 200 and supply it to the timing controller 140.

[0079] The timing controller 140 may generate image data DATA by combining input image data supplied from the host system and coordinate data supplied from the stylus pen 200 .

[0080] The data driving circuit 130 may display the image data DATA including the coordinate data of the stylus pen 200 through the display panel 110 .

[0081] Figure 4 is a view showing an example of a circuit constituting a sub-pixel in a touch display device according to an embodiment of the present disclosure.

[0082] Reference Figure 4, in the touch display device 100 according to an embodiment of the present disclosure, the subpixel SP may include one or more transistors and capacitors, and may have a light emitting element disposed therein.

[0083] For example, the sub-pixel SP may include a driving transistor DRT, a first switching transistor SWT1, a second switching transistor SWT2, a storage capacitor Cst, and a light emitting diode ED.

[0084] The driving transistor DRT includes a first node N1, a second node N2, and a third node N3. The first node N1 of the driving transistor DRT may be a gate node to which the data voltage Vdata is applied from the data driving circuit 130 through the data line DL when the first switching transistor SWT1 is turned on.

[0085] The second node N2 of the driving transistor DRT may be electrically connected to the anode electrode of the light emitting diode ED, and may be a source node or a drain node.

[0086] The third node N3 of the driving transistor DRT may be electrically connected to the driving voltage line DVL to which the sub-pixel driving voltage EVDD is applied, and may be a drain node or a source node.

[0087] In this case, during the display driving period, the sub-pixel driving voltage EVDD required for displaying an image may be supplied to the driving voltage line DVL. For example, the sub-pixel driving voltage EVDD required for displaying an image may be 27V.

[0088] The first switch transistor SWT1 is electrically connected between the first node N1 of the drive transistor DRT and the data line DL, and (as Figure 3 The gate line GL shown in FIG. 1 is connected to the gate node. Therefore, the first switching transistor SWT1 is operated according to the first scan signal SCAN1 supplied through the gate line GL. When the first switching transistor SWT1 is turned on, the first switching transistor SWT1 transmits the data voltage Vdata supplied through the data line DL to the gate node of the driving transistor DRT, thereby controlling the operation of the driving transistor DRT.

[0089] The second switch transistor SWT2 is electrically connected between the second node N2 of the drive transistor DRT and the reference voltage line RVL, and (as Figure 3 The gate line GL shown in FIG. 1 is connected to the gate node and operates according to the second scan signal SCAN2 supplied through the gate line GL. When the second switching transistor SWT2 is turned on, the reference voltage Vref supplied through the reference voltage line RVL is transmitted to the second node N2 of the driving transistor DRT.

[0090] In other words, when the first and second switching transistors SWT1 and SWT2 are controlled, the voltage of the first and second nodes N1 and N2 of the driving transistor DRT are controlled so that current for driving the light emitting diode ED can be supplied.

[0091] The gate nodes of the first switching transistor SWT1 and the second switching transistor SWT2 may be commonly connected to one gate line GL, or may be connected to different gate lines GL. An example is shown in which the first switching transistor SWT1 and the second switching transistor SWT2 are connected to different gate lines GL, in which case the first switching transistor SWT1 and the second switching transistor SWT2 may be independently controlled by the first scanning signal SCAN1 and the second scanning signal SCAN2 transmitted through the different gate lines GL.

[0092] On the contrary, if the first and second switching transistors SWT1 and SWT2 are connected to one gate line GL, the first and second switching transistors SWT1 and SWT2 may be simultaneously controlled by the first scan signal SCAN1 or the second scan signal SCAN2 transmitted through the same gate line GL, and the aperture ratio of the subpixel SP may be increased.

[0093] The transistor provided in the sub-pixel SP may be an n-type transistor or a p-type transistor, and in the illustrated example, the transistor is an n-type transistor.

[0094] The storage capacitor Cst is electrically connected between the first node N1 and the second node N2 of the driving transistor DRT, and maintains the data voltage Vdata during one frame.

[0095] Depending on the type of the driving transistor DRT, a storage capacitor Cst may also be connected between the first node N1 and the third node N3 of the driving transistor DRT. An anode electrode of the light emitting diode ED may be electrically connected to the second node N2 of the driving transistor DRT, and a reference voltage EVSS may be applied to a cathode electrode of the light emitting diode ED.

[0096] The reference voltage EVSS may be a ground voltage or a voltage higher or lower than the ground voltage. The reference voltage EVSS may vary according to a driving state. For example, the reference voltage EVSS during display driving and the reference voltage EVSS during sensing driving may be set to be different from each other.

[0097] The first and second switching transistors SWT1 and SWT2 may be referred to as scan transistors controlled by scan signals SCAN1 and SCAN2 .

[0098] The structure of the sub-pixel SP may further include one or more transistors, or in some cases, one or more capacitors.

[0099] The touch display device 100 of the present disclosure may transmit a touch pattern through the display panel 110 in a pattern period so that the stylus pen 200 may detect the touch pattern and generate coordinate data.

[0100] Figure 5 is a conceptual diagram illustrating a touch driving method according to an embodiment of the present disclosure.

[0101] Reference Figure 5 , the touch display device 100 according to an embodiment of the present disclosure may operate in a normal mode and a touch mode.

[0102] In the normal mode, a 1-frame period divided by the vertical synchronization signal Vsync corresponds to a display period, and an image is displayed on the display panel 110 during the display period.

[0103] On the other hand, in the touch mode, 1 frame period is divided into a display period and a touch period. In the touch mode, an image is displayed on the display panel 110 in the display period, and a touch pattern is displayed on the display panel 110 in the touch period.

[0104] The touch display device 100 may operate in a normal mode when contact with the stylus pen 200 is not detected, and may operate in a touch mode when contact with the stylus pen 200 is detected.

[0105] The stylus pen 200 may detect contact / approach of the touch display device 100 through the touch sensor 220. In addition, the touch display device 100 may switch between the normal mode and the touch mode using data transmitted from the stylus pen 200 through the communication circuit 150.

[0106] Alternatively, when touch electrodes are provided on the touch display device 100 , the touch display device 100 may switch between the normal mode and the touch mode using touch sensing signals detected by the touch electrodes.

[0107] At this time, when a touch pattern is displayed on the display panel 110 during the touch period, the stylus pen 200 may generate coordinate data by detecting the touch pattern displayed on the display panel 110 using the detection sync signal Dsync.

[0108] The timing controller 140 of the touch display device 100 may divide the frame period by the vertical synchronization signal Vsync, and supply the detection synchronization signal Dsync to the stylus pen 200 through the communication circuit 150. Therefore, the stylus pen 200 may detect a touch pattern during the touch period.

[0109] The detection sync signal Dsync may be generated after a certain time for displaying a touch pattern on the display panel 110 during the touch period.

[0110] The display period may include a time interval allowing the user to recognize an image through the display panel 110. In addition, the touch period may include a time interval allowing the stylus pen 200 to detect a touch pattern.

[0111] For example, the display period in the normal mode may correspond to 1 frame period. Meanwhile, in the touch mode, the display period may have a time interval of 70% to 90% of the 1 frame period, and the touch period may have a time interval of 10% to 30% of the 1 frame period.

[0112] Figure 6 is a diagram illustrating an operation process of a touch mode in a touch driving method according to an embodiment of the present disclosure.

[0113] Reference Figure 6 , the touch driving method according to the embodiment of the present disclosure may divide 1 frame period into a display period and a touch period in a touch mode.

[0114] In the touch mode, the display period is a period in which an image is displayed through the display panel 110. The display period may correspond to the first 80% of a 1 frame period.

[0115] During a display period, a scan signal is sequentially supplied through the N gate lines, and each sub-pixel emits light having a data voltage corresponding to an image, thereby displaying the image.

[0116] The touch period is a period in which a touch pattern is displayed by the display panel 110. The touch period may correspond to the latter 20% of the 1 frame period.

[0117] During a touch period, a scan signal is sequentially supplied through the N gate lines, and each sub-pixel emits light having a voltage corresponding to a touch pattern, thereby displaying the touch pattern.

[0118] When the display period is 80% of 1 frame period and the touch period is 20% of 1 frame period, it can be said that the duty ratio of the touch period in 1 frame period is 20%.

[0119] The touch period may include a pattern display period TP1 in which a touch pattern is sequentially displayed on the display panel 110 (eg, in which the touch pattern is completely displayed), and a pattern detection period TP2 in which the stylus pen 200 detects the touch pattern displayed by the display panel 110 .

[0120] The detection synchronization signal Dsync maintains an off level during the display period and the pattern display period TP1, and transmits the detection synchronization signal Dsync at an on level during the pattern detection period TP2. Therefore, the stylus pen 200 can detect the touch pattern displayed on the display panel 110 according to the on level detection synchronization signal Dsync.

[0121] When the touch period is the latter 20% of 1 frame period, the pattern display period TP1 and the pattern detection period TP2 may be 10% of 1 frame period, respectively.

[0122] Meanwhile, for the touch driving method according to an embodiment of the present disclosure, the time interval of the display period in the normal mode may be different from the time interval of the display period in the touch mode. Therefore, the width of the scan signal used to drive the same display panel 110 may vary according to the mode.

[0123] Figure 7 is a signal flow showing a scan signal in a normal mode in a touch driving method according to an embodiment of the present disclosure, and Figure 8 is a signal flow illustrating a scan signal in a touch mode in a touch driving method according to an embodiment of the present disclosure.

[0124] Reference Figure 7 , a 1-frame period in the normal mode corresponds to a display period for displaying an image.

[0125] Therefore, the scan signals are sequentially supplied through the gate lines during the display period, and the data voltages Vdata corresponding to the images are sequentially supplied through the data lines when the sub-pixels are turned on by each of the scan signals.

[0126] For example, when the display period has a time interval of 16.7 ms and a total of 10 scan signals SCAN1 to SCAN10 are sequentially supplied, 1 scan signal may have a signal width W1 of 1.67 ms.

[0127] At the same time, refer to Figure 8 , 1 frame period in the touch mode includes a display period and a touch period.

[0128] At this time, since the display period in the touch mode is shorter than that in the normal mode, the width W2 of the second scan signal supplied in the display period in the touch mode becomes shorter than the width W1 of the first scan signal supplied in the display period in the normal mode.

[0129] Since the touch period in the touch mode is a period in which a touch pattern is displayed, it is shorter than the display period. In addition, the width W3 of the third scan signal supplied in the touch period becomes shorter than the width W2 of the second scan signal supplied in the display period in the touch mode.

[0130] At this time, when the width of the scan signal changes, the brightness of the image displayed by the display panel 110 can change. Therefore, the touch display device 100 of the present disclosure can reduce the brightness deviation by controlling the level of the driving current Id flowing through the light emitting element of the sub-pixel based on the width of the scan signal that changes with the mode change.

[0131] Fig. 9 is a graph showing a change in driving current according to a width of a scan signal in a touch driving method according to an embodiment of the present disclosure.

[0132] Reference Fig. 9 , in the touch driving method according to an embodiment of the present disclosure, a width of a scan signal in a normal mode may be different from a width of a scan signal in a touch mode.

[0133] Since a 1-frame period in the normal mode corresponds to a display period in which an image is displayed, the width W1 of the first scan signal supplied to the display panel 110 in the normal mode may be the widest width.

[0134] On the other hand, the 1 frame period in the touch mode can be divided into a display period and a touch period. Therefore, the display period in the touch mode becomes shorter than the display period in the normal mode, and the width W2 of the second scan signal supplied in the display period in the touch mode becomes shorter than the width W1 of the first scan signal supplied in the display period in the normal mode.

[0135] Furthermore, the touch period in the touch mode becomes shorter than the display period, and the width W3 of the third scan signal supplied in the touch period in the touch mode becomes shorter than the width W2 of the second scan signal supplied in the display period in the touch mode.

[0136] At this time, since the display period in the touch mode is shorter than the display period in the normal mode, a brightness deviation may occur between the image displayed by the display panel 110 in the touch mode and the image displayed by the display panel 110 in the normal mode. In consideration of this brightness deviation, the brightness deviation can be reduced by controlling the level of the driving current Id flowing through the light emitting element of the sub-pixel based on the width of the scanning signal that varies with the mode.

[0137] When the first drive current Id1 flows to the light emitting element due to the width W1 of the first scan signal supplied to the display panel 110 in the normal mode, the width W2 of the second scan signal supplied in the display period in the touch mode becomes shorter than the width W1 of the first scan signal. Therefore, in the display period in the touch mode, it is necessary to control the second drive current Id2 to flow with a higher level than the first drive current Id1.

[0138] For example, when considering that the width W1 of the first scan signal is 100%, if the width W2 of the second scan signal is 80%, the level of the second drive current Id2 can be determined to be 120% (or 125%) or more of the level of the first drive current Id1. For the above case, the level of the data voltage Vdata corresponding to the same grayscale level can be controlled according to the mode. Alternatively, the level of the sub-pixel drive voltage EVDD supplied to the display panel 110 can be controlled according to the mode. Alternatively, for the same image data, the data voltage Vdata generated from the data drive circuit 130 in the touch mode can be amplified by a predetermined ratio to reduce the brightness deviation between the normal mode and the touch mode compared to the data voltage Vdata generated from the data drive circuit 130 in the normal mode.

[0139] Meanwhile, since the touch pattern displayed by the display panel 110 in the touch period in the touch mode may have a brightness level that can be recognized by the light sensor 210 of the stylus pen 200, the touch pattern may be displayed in a single color with low brightness. Alternatively, the touch pattern may also be displayed in a smaller number of colors with lower brightness.

[0140] In this case, the third driving current Id3 flowing through the light emitting element of the sub-pixel in the touch period in the touch mode may have a lower level than the first driving current Id1 .

[0141] Fig.10 is a diagram showing a touch pattern displayed in a touch display device according to an embodiment of the present disclosure.

[0142] Reference Fig.10 , the touch pattern in the touch display device 100 according to an embodiment of the present disclosure may include a cell region D-CELL positioned between adjacent guide lines CGL.

[0143] For example, the touch pattern may include a plurality of cell regions D-CELL arranged in rows and columns, a plurality of first guide lines CGL1 disposed between adjacent cell regions D-CELL in the second direction, and a plurality of second guide lines CGL2 disposed between adjacent cell regions D-CELL in the first direction.

[0144] Each of the plurality of first guide lines CGL1 may extend in the first direction, and each of the plurality of second guide lines CGL2 may extend in the second direction.

[0145] The touch pattern may include a plurality of first guide patterns CP_CGL1 respectively indicating a plurality of first guide lines CGL1 , a plurality of second guide patterns CP_CGL2 respectively indicating a plurality of second guide lines CGL2 , and a plurality of cell patterns CP_CELL respectively disposed in the plurality of cell regions D-CELL and arranged in rows and columns.

[0146] The arrangement shape of the plurality of cell patterns CP_CELL may be different for each of the plurality of cell regions D-CELL.

[0147] The plurality of cell patterns CP_CELL included in each of the plurality of cell regions D-CELL may be arranged in a matrix form of m rows and n columns.

[0148] In each of the plurality of cell regions D-CELL, a plurality of cell patterns CP_CELL may be arranged along virtual grid lines VGL1 and VGL2 of m rows and n columns.

[0149] Each of the plurality of cell regions D-CELL may correspond to one coordinate data. The overall arrangement position of the plurality of cell patterns CP_CELL included in each of the plurality of cell regions D-CELL may represent one coordinate data. Therefore, for each of the plurality of cell regions D-CELL, the plurality of cell patterns CP_CELL may be arranged in m rows and n columns, and the arrangement positions may be slightly different.

[0150] The plurality of cell patterns CP_CELL included in each of the plurality of cell regions D-CELL may have a unique array shape (also referred to as a unique array position pattern) corresponding to unique coordinates.

[0151] A unique array position pattern of the plurality of cell patterns CP_CELL included in each of the plurality of cell regions D-CELL may be an encryption pattern representing one unique coordinate.

[0152] For example, each of the plurality of cell regions D-CELL may include 36 cell patterns CP_CELL arranged in six rows and six columns and arranged in a unique pattern to represent (encode) unique coordinates.

[0153] The first unit region D-CELL1 may include 36 unit patterns CP_CELL to represent a first coordinate. The second unit region D-CELL2 may include 36 unit patterns CP_CELL to represent a second coordinate. The third unit region D-CELL3 may include 36 unit patterns CP_CELL to represent a third coordinate. The fourth unit region D-CELL4 may include 36 unit patterns CP_CELL to represent a fourth coordinate. The fifth unit region D-CELL5 may include 36 unit patterns CP_CELL to represent a fifth coordinate.

[0154] The array positions of the 36 unit patterns CP_CELL included in the first unit area D-CELL1 may be a first encryption pattern indicating a first coordinate, the array positions of the 36 unit patterns CP_CELL included in the second unit area D-CELL2 may be a second encryption pattern indicating a second coordinate, the array positions of the 36 unit patterns CP_CELL included in the third unit area D-CELL3 may be a third encryption pattern indicating a third coordinate, the array positions of the 36 unit patterns CP_CELL included in the fourth unit area D-CELL4 may be a fourth encryption pattern indicating a fourth coordinate, and the array positions of the 36 unit patterns CP_CELL included in the fifth unit area D-CELL5 may be a fifth encryption pattern indicating a fifth coordinate.

[0155] In other words, the first coordinate corresponding to the first unit region D-CELL1, the second coordinate corresponding to the second unit region D-CELL2, the third coordinate corresponding to the third unit region D-CELL3, the fourth coordinate corresponding to the fourth unit region D-CELL4, and the fifth coordinate corresponding to the fifth unit region D-CELL5 are all different. Therefore, the array positions of the 36 unit patterns CP_CELL included in the first unit D-CELL1, the array positions of the 36 unit patterns CP_CELL included in the second unit D-CELL2, the array positions of the 36 unit patterns CP_CELL included in the third unit D-CELL3, the array positions of the 36 unit patterns CP_CELL included in the fourth unit D-CELL4, and the array positions of the 36 unit patterns CP_CELL included in the fifth unit D-CELL5 may be different from each other.

[0156] Each of the plurality of unit regions D-CELL may correspond to a partial region of the display area DA. Each unit region D-CELL may overlap with a group of two or more sub-pixels among the plurality of sub-pixels included in the display area DA. For example, the first unit region D-CELL1 may overlap with a first group including two or more first sub-pixels, and the second unit region D-CELL2 may overlap with a second group including two or more second sub-pixels. The two or more first sub-pixels included in the first group and the two or more second sub-pixels included in the second group may be different from each other.

[0157] The stylus pen 200 may recognize a touch pattern displayed in the touch display device 100 , may recognize a plurality of first guide lines CGL1 and a plurality of second guide lines CGL2 based on the recognition result, and may recognize a plurality of cell regions D-CELL separated by the plurality of first guide lines CGL1 and a plurality of second guide lines CGL2 .

[0158] The stylus pen 200 may recognize the array positions of the plurality of cell patterns CP_CELL included in at least one of the plurality of cell regions D-CELL, and may determine the position (touch position) of the stylus pen 200 based on the recognition result.

[0159] For example, when the stylus 200 touches a position Pt centered on the first unit area D-CELL1, the stylus 200 can identify the array position of multiple unit patterns CP_CELL included in each of the first unit area D-CELL1 to the fifth unit area D-CELL5 based on the sensing result of the reflected light with a difference in brightness or wavelength, and can calculate a more accurate touch position based on the difference in signal strength between the reflected light and the first coordinates to the fifth coordinates corresponding to the first unit area D-CELL1 to the fifth unit area D-CELL5.

[0160] Fig.11 is a diagram illustrating a touch pattern displayed in a touch period in a touch driving method according to an embodiment of the present disclosure.

[0161] Reference Fig.11 According to the touch driving method according to an embodiment of the present disclosure, the touch pattern displayed in the touch period may be an encrypted pattern in which sub-pixels at specific positions among a plurality of sub-pixels formed on the display panel 110 emit light.

[0162] The touch pattern may include a guide line CGL for distinguishing the cell region D-CELL in which the encryption pattern is located from the cell region D-CELL.

[0163] The guide line CGL may include guide patterns CP_CGL1 and CP_CGL2 arranged at regular intervals to distinguish the cell region D-CELL. For example, the guide line CGL may be formed such that the first guide pattern CP_CGL1 is arranged at intervals of two sub-pixels and / or the second guide pattern CP_CGL2 is arranged at intervals of two sub-pixels.

[0164] An inner space of the guide line CGL corresponds to a cell region D-CELL in which the encryption pattern is located. The cell region D-CELL may include a plurality of sub-pixels.

[0165] The cell region D-CELL may include a different cell pattern CP_CELL for each region divided by the first and second guide lines CGL1 and CGL2 .

[0166] The unit pattern CP_CELL positioned in the unit region D-CELL may correspond to a pattern value determined according to the emission position. For example, the unit pattern may correspond to a specified pattern value depending on the direction of displaying the encryption pattern in the up, down, left, and right directions starting from the intersection of the virtual grating lines in the unit region D-CELL.

[0167] In this case, each pattern value may be converted into a first bit value of an X coordinate and a second bit value of a Y coordinate. By combining the above correspondence information, coordinates on the surface of the display panel 110 where the touch pattern is formed may be determined.

[0168] Here, 5×5 encrypted patterns are set in a unit area D-CELL composed of a horizontal area and a vertical area having a predetermined length, so that a unit pattern CP_CELL having a different detection pattern distribution can be formed in any direction. The unit grating formed by these 25 patterns can represent different position coordinates on the surface of the display panel 110.

[0169] For example, when the unit area D-CELL is formed with a 5×5 encryption pattern on the display panel 110 having a UHD resolution (3840×2160), 2 25 pieces of information, and can form up to 230,400 unit areas D-CELL.

[0170] Therefore, the stylus pen 200 may detect a pattern value corresponding to a touch pattern by detecting the touch pattern emitted on the display panel 110 by using the optical sensor 210 .

[0171] Meanwhile, when the touch driving method of the present disclosure operates in the touch mode, a touch period may be included in each frame, but may also be included at regular frame intervals.

[0172] Fig.12 is a diagram illustrating an operation when a touch period is included in every two frames in a touch driving method according to another embodiment of the present disclosure.

[0173] Reference Fig.12 , a touch driving method according to another embodiment of the present disclosure may include a touch period in every two frames in a touch mode.

[0174] For example, the first frame period may include a display period and a touch period, and the second frame period may include a display-only period. In addition, the third frame period may include a display period and a touch period, and the fourth frame period may include a display-only period.

[0175] The display period is a period in which an image is displayed through the display panel 110. During the display period, a scan signal is sequentially supplied through the N gate lines, and each sub-pixel emits light having a data voltage corresponding to the image, thereby displaying the image.

[0176] In the first frame period, the display period may be the first 60% of the first frame period, and the touch period may be the last 40% of the first frame period.

[0177] The touch period is a period in which a touch pattern is displayed by the display panel 110. During the touch period, a scan signal is sequentially supplied through the N gate lines, and each sub-pixel emits light having a voltage corresponding to the touch pattern, thereby displaying the touch pattern.

[0178] The touch period may include a pattern display period TP1 in which a touch pattern is sequentially displayed on the display panel 110 and a pattern detection period TP2 in which the stylus pen 200 detects the touch pattern displayed through the display panel 110 .

[0179] The detection synchronization signal Dsync maintains an off level during the display period and the pattern display period TP1. During the pattern detection period TP2, the detection synchronization signal Dsync is sent at an on level. Therefore, the stylus pen 200 can detect the touch pattern displayed on the display panel 110 according to the detection synchronization signal Dsync at the on level.

[0180] When the touch period is the last 40% of the first frame period, the pattern display period TP1 and the pattern detection period TP2 may each be 20% of the first frame period.

[0181] Meanwhile, the second frame period may include a display-only period. Therefore, the display period is 100% of the second frame period, and only an image is displayed during the second frame period.

[0182] The third frame period may be the same as the first frame period. The display period may be the first 60% of the third frame period, and the touch period may be the last 40% of the third frame period.

[0183] The fourth frame period may include a display-only period like the second frame period.

[0184] In this way, when the display period is 60% and the touch period is 40% of the frame period in an odd frame period, and the display period is 100% of the frame period in an even frame period, it can be said that the duty ratio of the touch period in the entire frame period is 20%.

[0185] Therefore, the touch driving method of the present disclosure may include a touch period in each frame period, or may include a touch period at regular frame intervals.

[0186] A case where a touch period is included in each frame period may be referred to as a first touch pattern, and a case where a touch period is included at regular frame intervals may be referred to as a second touch pattern.

[0187] The touch drive method of the present disclosure may be operated in the first touch mode or the second touch mode, or the first touch mode and the second touch mode may be operated alternately. When the first touch mode and the second touch mode are operated alternately, alternatively, the duty cycle of the touch period in the first touch mode and the second touch mode is maintained constant.

[0188] Fig.13 is a diagram showing a flowchart of a touch driving method according to an embodiment of the present disclosure.

[0189] Reference Fig.13 The touch driving method according to an embodiment of the present disclosure may include step S100 of determining whether there is a touch of the stylus, step S200 of operating in a normal mode when there is no touch of the stylus, step S300 of operating in a touch mode when there is a touch of the stylus, step S400 of determining the coordinates of the stylus in the touch mode, and step S500 of tracking the touch position.

[0190] The step S100 of determining whether there is a touch of the stylus pen 200 is a process in which the touch display device 100 determines the contact state of the stylus pen 200. The touch display device 100 may determine the touch of the stylus pen 200 by receiving pressure information detected by the touch sensor 220 of the stylus pen 200, and may determine the touch of the stylus pen 200 through the touch electrodes provided on the display panel 110.

[0191] Step S200 of operating in the normal mode when there is no touch of the stylus pen 200 is a process of displaying an image through the display panel 110 in a state where the stylus pen 200 is not in contact with the display panel 110 or is not close to the display panel 110 .

[0192] Step S300 of operating in the touch mode when there is a touch of the stylus pen 200 is a process of displaying a touch pattern by dividing a specific frame period into a display period and a touch period when a touch of the stylus pen 200 is detected.

[0193] The touch mode may include a first touch mode in which a touch period is included in each frame period, or a second touch mode in which a touch period is included at regular intervals in a frame period. The touch display device 100 may operate in the first touch mode or the second touch mode, or may operate alternately in the first touch mode and the second touch mode.

[0194] The step S400 of determining the coordinates of the stylus pen 200 in the touch mode is a process of determining the touch coordinates of the stylus pen 200 by detecting the touch pattern. The touch coordinates may be calculated by the stylus pen 200 to be sent to the touch display device 100, or may be calculated by the touch display device 100 using data of the touch pattern sent from the stylus pen 200.

[0195] The step S500 of tracking the touch position is a process of continuously detecting coordinate data of the stylus pen 200 and displaying the touch position of the stylus pen 200 on the display panel 110 .

[0196] Meanwhile, the touch driving method of the present disclosure may improve the efficiency of touch detection and image display by displaying a touch pattern only on a partial area adjacent to the touch coordinates after the touch coordinates of the stylus pen 200 are detected.

[0197] Fig.14 is a diagram illustrating a flowchart of a touch driving method according to another embodiment of the present disclosure.

[0198] Reference Fig.14 , the touch driving method according to the embodiment of the present disclosure may include step S100 of determining whether there is a touch of the stylus pen 200, step S200 of operating in a normal mode when there is no touch of the stylus pen 200, step S300 of operating in a touch mode when there is a touch of the stylus pen 200, step S350 of a global operation of displaying a touch pattern on the entire display panel in the touch mode, step S400 of determining the coordinates of the stylus pen 200, step S450 of a local operation of displaying a touch pattern on a local area of ​​the display panel based on the coordinates of the stylus pen 200, and step S500 of tracking the touch position.

[0199] The step S100 of determining whether there is a touch of the stylus pen 200 is a process in which the touch display device 100 determines the contact state of the stylus pen 200. The touch display device 100 may determine the touch of the stylus pen 200 by receiving pressure information detected by the touch sensor 220 of the stylus pen 200, and may determine the touch of the stylus pen 200 through the touch electrodes provided on the display panel 110.

[0200] Step S200 of operating in the normal mode when there is no touch of the stylus pen 200 is a process of displaying an image through the display panel 110 in a state where the stylus pen 200 is not in contact with the display panel 110 or is not close to the display panel 110 .

[0201] Step S300 of operating in the touch mode when there is a touch of the stylus pen 200 is a process of displaying a touch pattern by dividing a specific frame period into a display period and a touch period when a touch of the stylus pen 200 is detected.

[0202] The touch mode may include a first touch mode in which a touch period is included in each frame period, or a second touch mode in which a touch period is included in a frame period at regular intervals. The touch display device 100 may operate in the first touch mode or the second touch mode, or may operate alternately in the first touch mode and the second touch mode.

[0203] The step S350 of the global operation of displaying a touch pattern on the entire display panel in the touch mode is a process of displaying a touch pattern on the entire area of ​​the display panel 110 and detecting touch coordinates of the stylus pen 200 .

[0204] The initial position of the stylus pen 200 may be detected based on the entire area of ​​the display panel 110 through the step of a global operation.

[0205] The step S400 of determining the coordinates of the stylus pen 200 is a process of determining the touch coordinates of the stylus pen 200 by detecting the touch pattern. The touch coordinates may be calculated by the stylus pen 200 to be sent to the touch display device 100, or may be calculated by the touch display device 100 using data of the touch pattern sent from the stylus pen 200.

[0206] The step of partial operation S450 of displaying a touch pattern on a partial area based on the coordinates of the stylus pen 200 displays the touch pattern in the touch period only on a partial area adjacent to the initial position of the stylus pen 200. At this time, the remaining area except the partial area displaying the touch pattern may display an image.

[0207] That is, in the partial driving process, the touch pattern is displayed only on the partial area where the stylus pen 200 is detected, and the image is displayed on the remaining area of ​​the display panel 110. Therefore, the visibility of the image to the user can be improved.

[0208] The step S500 of tracking the touch position is a process of continuously detecting coordinate data of the stylus pen 200 and displaying the touch position of the stylus pen 200 on the display panel 110 .

[0209] Fig.15 is a conceptual diagram illustrating a process of performing a global operation and a local operation in a touch driving method according to an embodiment of the present disclosure.

[0210] Reference Fig.15 , the touch display device 100 according to an embodiment of the present disclosure may operate in a normal mode and a touch mode.

[0211] In the normal mode, a 1-frame period divided by the vertical synchronization signal Vsync corresponds to a display period, and an image is displayed on the display panel 110 during the display period.

[0212] On the other hand, in the touch mode, 1 frame period is divided into a display period and a touch period. In the display period, an image is displayed on the display panel 110, and in the touch period, a touch pattern is displayed on the display panel 110.

[0213] The touch display device 100 may operate in a normal mode when contact with the stylus pen 200 is not detected, and may operate in a touch mode when contact with the stylus pen 200 is detected.

[0214] In order to detect the initial position of the stylus pen 200 in the touch mode, a touch pattern may be displayed on the entire display panel.

[0215] The stylus pen 200 may detect contact of the touch display apparatus 100 through the touch sensor 220 , and the touch display apparatus 100 may switch from the normal mode to the touch mode by using contact data transmitted from the stylus pen 200 through the communication circuit 150 .

[0216] Alternatively, when touch electrodes are provided on the touch display device 100 , the normal mode may be switched to the touch mode by using touch sensing signals detected by the touch electrodes.

[0217] At this time, when a touch pattern is displayed on the display panel 110 in the touch period, the stylus pen 200 may generate coordinate data by detecting the touch pattern displayed on the display panel 110 using the detection sync signal Dsync.

[0218] After the initial position of the stylus pen 200 is detected, a touch pattern may be displayed on a partial area according to the touch coordinates. At this time, the remaining area except the partial area displaying the touch pattern may display an image.

[0219] At this time, the detection synchronization signal Dsync may be generated to correspond to a time when the touch pattern is displayed on the display panel 110 .

[0220] The timing controller 140 of the touch display device 100 may divide the frame period by the vertical synchronization signal Vsync, and supply the detection synchronization signal Dsync to the stylus pen 200 through the communication circuit 150. This allows detection of a touch pattern in the touch period.

[0221] The detection sync signal Dsync may be generated at a time after a touch pattern is displayed on the display panel 110 within a touch period.

[0222] The following briefly describes the implementation of the above disclosure.

[0223] A touch display device according to an embodiment of the present disclosure may include: a display panel including a plurality of sub-pixels; a driving circuit configured to drive the display panel; and a timing controller configured to control a normal mode of displaying an image or a touch mode of displaying an image and a touch pattern according to a touch state of a stylus pen.

[0224] The frame period is divided into a display period and a touch period in the touch mode, and the touch mode displays a touch pattern to be recognized by the stylus pen in the touch period.

[0225] The touch pattern includes a first touch pattern in which a touch period is included in each frame period.

[0226] The touch pattern includes a second touch pattern in which a touch period is included in an interval of a plurality of frames.

[0227] The touch period is 10% to 30% of the frame period.

[0228] The touch mode alternately switches a first touch mode in which a touch period is included in each frame period and a second touch mode in which a touch period is included in intervals of a plurality of frames.

[0229] The touch period includes a pattern display period in which a scan signal is supplied from a driving circuit to a plurality of sub-pixels and a touch pattern is displayed on the display panel, and a pattern detection period in which the stylus pen detects the touch pattern.

[0230] The width of the scan signal supplied to the display panel is controlled according to the length of the touch period or the length of the display period.

[0231] The width of the scan signal in the normal mode is greater than the width of the scan signal in the display period in the touch mode.

[0232] A width of the scan signal in the display period in the touch mode is greater than a width of the scan signal in the touch period in the touch mode.

[0233] The level of the driving current flowing through the sub-pixel is controlled according to the width of the scan signal.

[0234] For the same image data, a data voltage supplied to the plurality of sub-pixels in a display period of the touch mode is greater than a data voltage supplied to the plurality of sub-pixels in a normal mode.

[0235] The touch pattern includes a unit area in which sub-pixels for displaying the encryption pattern are located, and a guide line in which sub-pixels for dividing the unit area are located.

[0236] The respective unit areas divided by the guide lines show different encryption patterns.

[0237] The guide line is an area in which guide patterns of touch patterns are arranged at regular intervals.

[0238] A global operation of detecting a touch on the entire area of ​​the display panel or a local operation of detecting a touch on a local area adjacent to touch coordinates of the stylus pen is performed in the touch mode.

[0239] In addition, the touch driving method according to an embodiment of the present disclosure may include: a step of determining whether there is a touch of the stylus; a step of operating in a normal mode for displaying an image when there is no touch of the stylus; a step of operating in a touch mode for displaying an image and a touch pattern when there is a touch of the stylus; a step of determining the coordinates of the stylus in the touch mode; and a step of tracking the touch position of the stylus.

[0240] In the step of operating in the touch mode, a first touch mode in which a touch period for displaying a touch pattern is included in each frame period and a second touch mode in which a touch period is included in intervals of a plurality of frames are alternately performed.

[0241] The step of operating in the touch mode includes a global operation for displaying a touch pattern on the entire display panel, and a local operation for displaying a touch pattern in a local area based on the coordinates of the stylus pen.

[0242] The above description has been given to enable any person skilled in the art to make and use the technical ideas of the present disclosure, and the above description has been provided in the context of a specific application and its requirements. Various modifications, additions and substitutions to the described embodiments will be readily 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 exemplary purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical ideas of the present disclosure.

Claims

1. A touch display device, comprising: A display panel, the display panel comprising a plurality of sub-pixels; a driving circuit configured to drive the display panel; as well as The timing controller is configured to control a normal mode of operation to display an image or a touch mode of operation to display an image and a touch pattern based on a touch state of the stylus pen.

2. The touch display device according to claim 1, wherein: In the touch mode, a frame period is divided into a display period and a touch period. The touch mode is configured to display the touch pattern to be recognized by the stylus pen during the touch period.

3. The touch display device according to claim 2, wherein: The touch pattern includes a first touch pattern in which the touch period is included in each frame period.

4. The touch display device according to claim 2, wherein: The touch pattern includes a second touch pattern in which the touch period is included in a plurality of frame intervals.

5. The touch display device according to claim 2, wherein: The touch period is 10% to 30% of the frame period.

6. The touch display device according to claim 2, wherein: The touch mode is configured to alternately switch between a first touch mode in which the touch period is included in each frame period and a second touch mode in which the touch period is included in a plurality of frame intervals.

7. The touch display device according to claim 2, wherein: The touch period includes: a pattern display period in which a scan signal is supplied from the drive circuit to the plurality of sub-pixels and the touch pattern is displayed on the display panel; and A pattern detection period, during which the stylus detects the touch pattern.

8. The touch display device according to claim 2, wherein: A width of a scan signal supplied to the display panel is controlled based on a length of the touch period in the display period.

9. The touch display device according to claim 8, wherein: A width of the scan signal in the normal mode is greater than a width of the scan signal in the display period in the touch mode.

10. The touch display device according to claim 8, wherein: A width of the scan signal in the display period in the touch mode is greater than a width of the scan signal in the touch period in the touch mode.

11. The touch display device according to claim 8, wherein: A level of a driving current flowing through the sub-pixel is configured to be controlled according to a width of the scan signal.

12. The touch display device according to claim 8, wherein: For the same image data, the data voltages supplied to the plurality of sub-pixels in the display period of the touch mode are configured to be greater than the data voltages supplied to the plurality of sub-pixels in the normal mode.

13. The touch display device according to claim 12, wherein: For the same image data, a data voltage supplied to the plurality of sub-pixels in the touch period of the touch mode is less than a data voltage supplied to the plurality of sub-pixels in the normal mode.

14. The touch display device according to claim 1, wherein: The touch pattern includes: A unit area where a sub-pixel for displaying an encrypted pattern is located; and The guide lines where the sub-pixels are located are used to divide the unit area.

15. The touch display device according to claim 14, wherein: Each unit area divided by the guide line displays a different encryption pattern.

16. The touch display device according to claim 14, wherein: The guide line is a region of the guide pattern in which the touch patterns are arranged at regular intervals.

17. The touch display device according to claim 1, wherein: A global operation of detecting a touch on an entire area of ​​the display panel or a local operation of detecting a touch on a local area adjacent to touch coordinates of the stylus pen is configured to be performed in the touch mode.

18. A touch driving method, comprising: Determine whether there is a touch of the stylus; When there is no touch of the stylus pen, operating in a normal mode for displaying an image; operating in a touch mode for displaying an image and a touch pattern when there is a touch of the stylus; determining coordinates of the stylus in the touch mode; as well as A touch position of the stylus is tracked.

19. A touch sensing system comprising: A display panel, the display panel comprising a plurality of sub-pixels; a stylus pen, the stylus pen sensing contact or proximity with the display panel; a driving circuit configured to drive the display panel; as well as a timing controller configured to control a normal mode of displaying an image or a touch mode of displaying an image and a touch pattern according to a touch state of the stylus; Wherein, the touch pattern includes: A unit area where a sub-pixel for displaying an encrypted pattern is located; and The guide lines where the sub-pixels are located are used to divide the unit area.

Images