Driving method, driving circuit and touch display device of touch display panel

Abstract

A driving method, a driving circuit and a touch display device of a touch display panel are provided. The driving method comprises: obtaining a stylus touch position; determining a first area on the touch display panel based on the stylus touch position; and in an uplink (UL) transmission period, sending an UL signal to a touch sensing electrode in the first area, and sending an anti-interference signal to a touch sensing electrode in at least a part of an area on the touch display panel except the first area, wherein the UL signal sent to the touch sensing electrode in the first area in the UL transmission period is for sending to the stylus.

Description

Technical Field

[0001] This disclosure relates to the field of touch technology, and more specifically, to a driving method, driving circuit, and touch display device for a touch display panel. Background Technology

[0002] In existing technologies, users can control touch display devices using their fingers or input devices.

[0003] Active pens are commonly used input devices for interacting with touch display devices. The touch display panel in a touch display device includes a display panel and touch sensors. The touch sensors include multiple touch sensing electrodes and can be integrated into the display panel structure (in-cell) or placed on the display panel as a separate touch panel (on-cell). They can sense both finger touches and active pen touches. The touch sensing module can be a separate circuit or integrated with the display driver circuit. For example, it can be integrated into a single touch sensing chip or integrated with the display driver circuit into a single Touch and Display Driver Integrated (TDDI) chip.

[0004] Currently available active pens possess two-way communication capabilities. The active pen and touch display panel can communicate bidirectionally via uplink / downlink (UL / DL) signals, providing users with greater support and convenience. The bidirectional communication provided by the active pen includes, for example, the UL signal being sent by the TDDI chip and the DL signal being sent by the active pen. The UL signal carries the encoded instructions (instructions) that the TDDI chip wants to transmit to the active pen, while the DL signal carries the encoded instructions (instructions) that the active pen wants to transmit to the TDDI chip. Figure 1A As shown, when the stylus approaches or touches the touch display panel, it receives a UL signal and responds accordingly, such as switching stylus modes and setting the frequency. Figure 1B As shown, when the active pen sends a DL signal, the capacitance value of the touch sensing electrode changes accordingly. During DL transmission, for example, the analog front-end (AFE) in the TDDI chip receives the DL signal from the touch sensing electrode. After preliminary processing, the processor within the TDDI can determine the touch position of the active pen and provide this touch position to the core processor of the touch device or touch display device (such as a mobile phone or tablet computer). Simultaneously, the TDDI chip also decodes the received DL signal to determine the instructions transmitted by the active pen to the TDDI chip.

[0005] However, with the increasing size of touch display panels, users are more likely to touch the panel simultaneously with other parts of their body besides the hand holding the pen (such as the palm or fingers of the other hand). Based on the physical characteristic of the human body as a conductor, when a user uses the active pen, the UL signal sent by the TDDI chip through the touch sensing electrodes is not only received by the active pen but also by other parts of the user's body and transmitted to the pen's casing (usually used as a ground terminal). The latter interferes with the UL signal received by the active pen, thus affecting its sensing of the UL signal and potentially causing a complete interruption of UL transmission. Summary of the Invention

[0006] The embodiments of this disclosure provide a driving method, driving circuit, and touch display device for a touch display panel, which can reduce the intensity of UL signals transmitted to the active pen from other parts of the user's body (e.g., the palm), thereby increasing the signal-to-noise ratio of the UL signals received by the active pen to ensure the normal operation of the active pen.

[0007] According to one aspect of this disclosure, a driving method for a touch display panel is provided. The touch display panel includes a plurality of touch sensing electrodes. The driving method includes: acquiring an active pen touch position; determining a first region on the touch display panel based on the active pen touch position; and during an uplink (UL) transmission period, sending a UL signal to the touch sensing electrodes in the first region, and sending an anti-interference signal to touch sensing electrodes in at least a portion of the touch display panel other than the first region, wherein the UL signal sent to the touch sensing electrodes in the first region during the UL transmission period is for sending to the active pen.

[0008] According to another aspect of this disclosure, a driving method for a touch display panel is provided. The touch display panel includes a plurality of touch sensing electrodes. The driving method includes: acquiring a human touch position; determining a human touch area on the touch display panel based on the human touch position; during an uplink (UL) transmission period, sending a UL signal to the touch sensing electrodes in the human touch area, and sending an anti-interference signal to touch sensing electrodes in at least a portion of the touch display panel other than the human touch area, wherein the UL signal sent to the touch sensing electrodes in the human touch area during the UL transmission period is intended to be transmitted to the active pen through the human body.

[0009] According to another aspect of this disclosure, a driving circuit is provided, wherein a touch display panel includes a plurality of touch sensing electrodes. The driving circuit includes: a signal generation module for generating an uplink (UL) signal and an anti-interference signal, wherein the UL signal or the anti-interference signal is selectively transmitted to each of the plurality of touch sensing electrodes during an uplink (UL) transmission period; a touch sensing module for receiving a DL signal from the plurality of touch sensing electrodes during a downlink (DL) transmission period of an active pen, the DL signal being used to determine an active pen touch position; and a control module for: acquiring the active pen touch position; determining a first area on the touch display panel based on the active pen touch position; and during the active pen UL transmission period, controlling the transmission of the UL signal to the touch sensing electrodes in the first area, and transmitting the anti-interference signal to the touch sensing electrodes in at least a portion of the touch display panel other than the first area, wherein the UL signal transmitted to the touch sensing electrodes in the first area during the UL transmission period is for transmission to the active pen.

[0010] According to another aspect of this disclosure, a driving circuit for a touch display panel is also provided. The touch display panel includes a plurality of touch sensing electrodes. The driving circuit includes: a signal generation module for generating an uplink (UL) signal, an anti-interference signal, and a touch excitation signal; a touch sensing module for sending the touch excitation signal to the plurality of touch sensing electrodes and acquiring sensing signals therefrom during a touch detection period, the sensing signals being used to determine a human touch position; and a control module for: acquiring the human touch position; determining a human touch area on the touch display panel based on the human touch position; and during an uplink (UL) transmission period, controlling the sending of the UL signal to the touch sensing electrodes within the human touch area and sending the anti-interference signal to the touch sensing electrodes in at least a portion of the area on the touch display panel other than the human touch area, wherein the UL signal sent to the touch sensing electrodes within the human touch area during the UL transmission period is intended to be transmitted to the active pen through the human body.

[0011] According to another aspect of this disclosure, a touch display device is also provided, comprising: a touch display panel including a plurality of touch sensing electrodes for performing touch sensing during a touch detection period, transmitting a UL signal to an active pen during an uplink (UL) transmission period, and receiving a DL signal from the active pen during a downlink (DL) transmission period of the active pen; and a driving circuit as described in the foregoing aspects.

[0012] In various embodiments of this disclosure, by sending anti-interference signals to touch sensing electrodes in areas where UL interference signals may be conducted to the active pen (e.g., the area corresponding to the human touch location), the intensity of UL interference signals conducted to the active pen can be reduced, thereby improving the sensing performance of the active pen. Attached Figure Description

[0013] Figure 1A-1B A schematic diagram illustrates the two-way communication process between the active pen and the touch display panel.

[0014] Figure 2 This is a schematic diagram of a touch display device 200 according to an embodiment of the present disclosure.

[0015] Figure 3 yes Figure 2 The timing diagram corresponding to the touch display device 200 shown.

[0016] Figures 4A-4B A schematic diagram illustrates the effect of human touch on the intensity of the UL signal received by the active pen when the human body touches the touch display panel.

[0017] Figures 5A-5B Flowcharts of driving methods for touch display panels according to embodiments of the present disclosure are shown.

[0018] Figures 6A-6B A schematic diagram of an implementation method for sending anti-interference signals to touch sensing electrodes in areas other than the first area is shown.

[0019] Figures 7A-7B A schematic diagram of an implementation is shown, illustrating the sending of UL signals to touch sensing electrodes in areas other than the first and second regions.

[0020] Figure 8 A schematic diagram of an implementation method for setting up a buffer area is shown.

[0021] Figure 9 A schematic flowchart of a driving method for a touch display panel according to an embodiment of the present disclosure is shown.

[0022] Figures 10A-10B It shows Figure 9 A schematic diagram of an embodiment of the driving method shown.

[0023] Figure 11 A structural block diagram of a driving circuit for a touch display panel according to an embodiment of the present disclosure is shown.

[0024] Figure 12 It shows Figure 11 The diagram shows a specific circuit implementation of the driving circuit.

[0025] Figures 13A-13D The different time periods are shown respectively. Figure 12 The selection module of the driving circuit shown determines the connection method between the touch sensing electrode and the signal generation module and the touch sensing module. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0027] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. Singular expressions may include plural expressions, and plural expressions may include singular expressions, unless clearly defined in the context. Terms such as “including” or “comprising” mean that the component or object preceding the word encompasses the components or objects listed following the word and their equivalents, without excluding other components or objects.

[0028] Furthermore, elements / components / steps with the same reference numerals represent the same or similar parts in the drawings and embodiments. Elements / components / steps with the same reference numerals in different embodiments can be referred to in the relevant descriptions.

[0029] Figure 2 This is a schematic diagram of a touch display device 200 according to an embodiment of the present disclosure. Figure 3 yes Figure 2 The timing diagram corresponding to the touch display device 200 shown.

[0030] Please refer to Figure 2 The touch display device 200 includes a driving circuit (e.g., a touch and display driver integration (TDDI) circuit) and a touch display panel. The touch display panel includes multiple pixel structures P within a display area. The touch display panel can integrate a touch sensor with the display panel in an in-cell or on-cell manner. The touch sensor includes multiple touch sensing electrodes RX, such as touch sensing electrodes RX arranged in an array. The driving circuit may include a touch sensing module 210, a gate driver 220, and a source driver 230, etc. Optionally, the gate driver 210 and / or the source driver 230 may also be arranged outside the driving circuit, for example, arranged on the touch display panel. In this disclosure, Figure 2The horizontal direction of the touch sensing electrode array shown is defined as the row direction, and the vertical direction is defined as the column direction. However, those skilled in the art know that the determination of the row direction and the column direction can be interchanged.

[0031] The touch display device 200 also includes a sensing line SL, a gate line GL, and a data line D. The touch sensing electrodes RX are electrically insulated from each other and are electrically connected to the touch sensing module 210 via the sensing line SL. Each gate line GL is connected to the gate driver 220 and to the gate of the thin-film transistor in the corresponding pixel structure P. Each data line D is connected to the source driver 230 and to the source of the thin-film transistor in the corresponding pixel structure P. The drain of the thin-film transistor is connected to the pixel electrode. For simplicity, Figure 2 The diagram does not show all the circuitry (such as timing controllers, signal generation modules, etc.), so the aforementioned drive circuitry may include other components.

[0032] During the touch detection period, a self-capacitance sensing method is used to determine whether each touch sensing electrode RX is touched. Specifically, the touch sensing module 210 can transmit a touch excitation signal to the touch sensing electrode RX via the sensing line SL, and receive a sensing signal via the sensing line SL. This sensing signal reflects whether the capacitance value on the connected touch sensing electrode RX changes, thereby determining whether a touch event has occurred. In addition, during the sensing of touch by the active pen, when the active pen sends a downlink (DL) signal during the DL transmission period, the capacitance value of the touch sensing electrode also changes. Therefore, the touch sensing module 210 receives the DL signal to determine the touch position of the active pen. Since the DL transmission period is short, the process of determining the touch position of the active pen can also be performed outside of the DL signal transmission period.

[0033] To determine the location of human body / active pen touch, the touch sensing module 210 may further include an analog front end, a multiplexer, and / or an integrator, etc., but the driving circuit of the embodiments of this disclosure may also include more circuit components. The structure of the example touch sensing module 210 will be described later.

[0034] like Figure 3 As shown, it illustrates the use of Figure 2 This is a timing diagram of a touch display device within a predetermined period, the duration of which may include the duration of a display frame or other durations. The predetermined period may be divided into at least one UL transmission period (i.e., the UL detection or decoding period of the active pen), at least one display period, at least one touch detection period, and at least one pen touch detection period (i.e., the DL transmission period of the active pen), these periods do not overlap and can be set alternately.

[0035] During each UL transmission period, the driving circuit transmits the UL signal to be sent to the active pen through multiple touch sensing electrodes; during each display period, the driving circuit drives the touch display device to display an image; during each touch detection period, the driving circuit drives the touch display device to perform touch detection (human touch) on at least a portion of the touch sensing electrodes; during each pen touch detection period, the driving circuit receives the DL signal transmitted by the active pen through the touch sensing electrodes, wherein the DL signal transmitted by the active pen is generated in response to the UL signal received from the touch sensing electrodes in the previous uplink transmission period.

[0036] Optionally, the UL signal is a variable signal capable of carrying information and can have any suitable waveform such as square wave, triangle wave, or sine wave.

[0037] As mentioned earlier, if the UL signal received by the active pen is interfered with by signals transmitted from the human body, such as the palm of the hand, the DL signal generated by the active pen may be incorrect or the active pen may be unable to generate a DL signal.

[0038] Figures 4A-4B This diagram illustrates the effect on the strength of the UL signal received by the active pen when the user's non-pen-holding hand touches the touch display panel.

[0039] like Figure 4A As shown, when the user's non-pen-holding hand does not approach or touch (collectively referred to as touching) the touch display panel, the active pen receives a UL signal (labeled as Pen). UL The basic principle is the UL signal (labeled as Panel) sent via touch sensing electrodes. UL The same applies. In this disclosure, increasing the number of touch sensing electrodes (e.g., the number of touch sensing electrode rows) is beneficial for increasing the strength of the UL signal received by the active pen.

[0040] like Figure 4B As shown, when the user's non-pen-holding hand approaches or touches (collectively referred to as touching) the touch display panel, the UL signal sent through the touch sensing electrodes is received not only by the active pen but also by the user's palm and transmitted to the active pen's casing. Therefore, the UL signal received by the active pen (Pen) UL The intensity of the UL signal (Panel) transmitted through the touch sensing electrodes is equal to the intensity of the UL signal transmitted through the touch sensing electrodes. UL The intensity of the signal and the UL signal (UL interference signal, denoted as Body) received via the palm of the hand. UL The difference in intensity of the UL signal received by the active pen (Pen) ULThe intensity of the signal will be significantly reduced, which may affect the active pen's sensing of the UL signal, and in severe cases, may cause the UL transmission to be interrupted. In addition, in some cases, the user's hand holding the pen may also touch or be close to the touch display panel, which will also affect the intensity of the UL signal received by the active pen.

[0041] Therefore, embodiments of this disclosure provide a driving method for a touch display panel that can provide different signals in zones on the touch display panel according to the touch position of a human body and / or an active pen, so as to minimize the influence of the human body on the intensity of the UL signal received by the active pen.

[0042] Figures 5A-5B Flowcharts illustrating a driving method for a touch display panel according to embodiments of the present disclosure are shown. The touch display panel may be as follows: Figure 2 The touch display panel in the touch display device shown, and the driving method can be provided by... Figure 2 The driving circuit in the middle is used to execute.

[0043] like Figure 5A As shown, in step S510, the active pen touch position is obtained.

[0044] For example, the active pen touch location can be the position where the active pen approaches or touches the touch display panel. The previously detected active pen touch location that is closest in time can be used as the currently acquired active pen touch location. For example, multiple previously detected active pen touch locations can be saved in association with the detection time to obtain the active pen touch location that is closest in time.

[0045] In step S520, a first area on the touch display panel is determined based on the location of the active pen touch.

[0046] For example, the column containing the acquired active pen touch position can be defined as the first region, or the column containing the acquired active pen touch position and the regions corresponding to all touch sensing electrodes in a first preset number of adjacent columns can be defined as the first region. In the context of this disclosure, the column containing the active pen touch position or the human body touch position refers to the column containing the touch sensing electrodes corresponding to the active pen touch position or the human body touch position.

[0047] Alternatively, considering that the active pen may move, in addition to determining the area corresponding to all touch sensing electrodes of the column where the active pen touch position is located and the adjacent first preset number of columns as the first area as described above, the touch range and / or movement speed of the active pen can be determined based on at least one active pen touch position in a previously predetermined time period, and the first area can be determined based on the touch range and / or movement speed of the active pen.

[0048] For example, if it is known that the touch range of the active pen within a previously predetermined time period corresponds to the area of ​​some touch sensing electrodes in columns 2-3, then the area corresponding to all touch sensing electrodes in columns 2-3 or 2-4 can be used as the first region. As another example, if the movement speed of the active pen is known, then the possible touch positions of the active pen in various directions from the acquired active pen touch position (the active pen touch position closest in time) can be calculated, and the columns corresponding to these possible touch positions can be determined. Then, the area corresponding to all touch sensing electrodes in these columns can be used as the first region.

[0049] It should be noted that, for example, Figure 2 In the illustrated touch sensing electrode array, although the touch position of the active pen may only involve a portion of the touch sensing electrodes in one column, by simultaneously sending the same signal to drive the touch sensing electrodes in the same column, mutual interference between adjacent touch sensing electrodes in the same column can be reduced. Furthermore, due to hardware circuitry, the mutual influence between touch sensing electrodes in adjacent columns is minimal. Therefore, the same signal (e.g., UL signal, anti-interference signal, touch excitation signal) is sent to all touch sensing electrodes in the same column. Thus, in the context of this disclosure, the first region, second region, third region, and other regions mentioned all include at least one column of touch sensing electrodes.

[0050] In step S530, during the uplink (UL) transmission period, a UL signal is sent to the touch sensing electrodes in the first area, and an anti-interference signal is sent to the touch sensing electrodes in at least a portion of the touch display panel other than the first area.

[0051] As mentioned above, the UL signal sent to the touch sensing electrodes in the first area during the UL transmission period is used to send to the active pen, and the active pen is used to receive the UL signal from the touch display panel during the UL transmission period to obtain UL information and decode it.

[0052] Optionally, the anti-interference signal may include, for example, a DC voltage signal (a signal with a fixed amplitude or a ground voltage, such as 0 volts), a high-impedance signal (HiZ), or a variable signal with an amplitude smaller than that of the UL signal (in phase and frequency with the UL signal), but is not limited thereto. The type of anti-interference signal may be determined according to the characteristics of the panel, as long as it can reduce the intensity of the UL signal (considered as a UL interference signal) transmitted from the human body (e.g., the palm) to the pen shell of the active pen.

[0053] For example, the at least a portion of the area may include the area corresponding to the location where a human body touches or is near the touch display panel. The area corresponding to the human body touch location may be the orthographic projection area of ​​the human body on the touch display panel, and its size is determined by the contact area between the human body and the touch display panel. By sending anti-interference signals to the touch sensing electrodes at least within the area corresponding to the human body touch location, the intensity of the UL signal (considered a UL interference signal) transmitted through the human body to the active pen can be reduced.

[0054] According to one embodiment, the at least part of the area includes areas other than the first area, that is, anti-interference signals can be sent to touch sensing electrodes in all areas other than the first area on the touch display panel.

[0055] For example, Figures 6A-6B A schematic diagram of this implementation is shown.

[0056] like Figure 6A and Figure 6B As shown, different patterns illustrate the signals sent to the touch sensing electrodes in the first region and other regions besides the first region. Figure 6A This is an example of sending a ground voltage signal to the touch sensing electrodes in areas other than the first area, and Figure 6B This is an example of sending a high-impedance signal (HiZ) to the touch sensing electrodes in areas other than the first area.

[0057] exist Figures 6A-6B In the illustrated embodiment, the UL signal received by the active pen is the absolute value of the difference between the UL signal sent by the touch sensing electrodes and the UL interference signal transmitted from the human body to the pen shell, which can be expressed as Pen UL =|Panel UL –Body UL |, where Panel UL The Body indicates the strength of the UL signal transmitted by the touch sensing electrodes within the first area. UL This indicates the strength of the UL interference signal transmitted to the active pen through the human body (palm). Therefore, by sending anti-interference signals to the touch sensing electrodes in areas other than the first area, although the strength of the UL signal transmitted by the touch sensing electrodes in the first area is [increased / decreased], the panel [is used to measure / control the interference signal]. UL Compared to transmitting UL signals across the entire panel area, this might involve some sacrifices, but it can reduce the strength of UL interference signals (Body). UL The intensity of the UL signal received by the active pen is reduced to a low value (e.g., 0), thus the intensity of the UL signal received by the active pen is reduced. UL Compared to the case where UL signals are sent to the touch sensing electrodes across the entire panel area ( Figures 4A-4BThe sensor size will also increase accordingly, and the sensing effect of the active pen can be improved to a certain extent.

[0058] Reference Figures 6A-6B In the described implementation, the signal strength of the UL interference signal transmitted to the active pen through the human body can be reduced, thereby improving the sensing effect of the active pen.

[0059] In addition, in reference Figures 6A-6B In the described implementation, since the UL signal is sent only to the touch sensing electrode in the first area of ​​the touch display panel, the active pen may not be able to receive a UL signal of sufficient strength, thus failing to sense the encoded data in the UL signal, causing the driving circuit (TDDI chip) and the active pen to be unable to communicate bidirectionally normally.

[0060] Therefore, as Figure 5B As shown, Figure 5A The driving method shown may also include the following steps S540-S560.

[0061] It should be noted that, in the context of this disclosure, although the steps in the flowchart of the method are shown sequentially, these steps may not be executed in the shown order. Instead, they may be executed in an overlapping, simultaneous, or reverse order, depending on the actual situation. This disclosure does not impose any restrictions on this. For example, for steps S510-560, step S540 may be executed before step S510, and step S560 may be performed simultaneously with step S530, and so on.

[0062] In step S540, the location of human touch is obtained.

[0063] For example, the location of a human body (e.g., palm) touches the screen during each touch detection period. For instance, a driving circuit (e.g., a TDDI chip) sends a touch excitation signal to the touch sensing electrodes during the touch detection period, acquires a sensing signal from the touch sensing electrodes, and determines the location of the human body touching or approaching the touch display panel based on the sensing signal. For example, in situations such as... Figure 3 In each touch detection period shown, touch detection is performed on at least a portion of the multiple touch sensing electrodes included in the touch display panel, and it is determined whether a touch event has occurred at that portion of the touch sensing electrodes, i.e. whether a human body has touched that portion of the touch sensing electrodes.

[0064] Similar to the active pen touch location, the human touch location obtained in step S540 can be the human touch location that is closest in time to the previously detected one. For example, multiple previously detected human touch locations can be saved in association with the detection time to obtain the human touch location that is closest in time.

[0065] In step S550, a second region on the touch display panel is determined based on the location of the human touch, wherein the at least part of the region in step S530 where the touch sensing electrodes are sent with anti-interference signals includes the second region.

[0066] For example, the second region includes the region corresponding to all touch sensing electrodes in the column where the human body touches the location, or it includes the region corresponding to all touch sensing electrodes in the column where the human body touches the location and the adjacent second preset number of columns.

[0067] Optionally, the second area may be one or more, depending on the location of the human touch on the touch display panel.

[0068] In step S560, during the UL transmission period, the UL signal is sent to the touch sensing electrodes in the area of ​​the touch display panel other than the first area and the at least part of the area.

[0069] Optionally, the second region may overlap with the first region, for example, when the active pen touch position and the human touch position are close together. Since it is necessary to ensure the extent of the first region to guarantee the strength of the UL signal sent from the touch display panel to the active pen, in the case of an overlapping area between the second and first regions, the second region should be understood as the area within the defined second region that does not overlap with the first region. Furthermore, sending an anti-interference signal to the touch sensing electrodes within the second region can be considered as sending an anti-interference signal to the touch sensing electrodes within the second region that does not overlap with the first region.

[0070] Optionally, when sending anti-interference signals to the touch sensing electrodes in the second region, and also sending anti-interference signals to other regions on the touch display panel besides the first region and the at least part of the region including the second region, the signal is compatible with... Figures 6A-6B The situation described is similar; the strength of the UL interference signal transmitted through the human body to the active pen can be reduced, but the active pen may not be able to receive a UL signal of sufficient strength.

[0071] Therefore, in another embodiment, a UL signal can be sent to touch sensing electrodes in areas other than the first region and the at least part of the region including the second region on the touch display panel. The at least part of the region may include only the second region, may include the second region and some regions other than the first and second regions, such as some regions adjacent to the second region, or may include all regions other than the first region as shown in 6A-6B, which is not limited in this disclosure.

[0072] For example, increasing the number of touch-sensing electrodes transmitting UL signals can enhance the strength of the UL signal received by the active pen, thus resisting interference from other noise. Optionally, the UL signal transmitted by the touch-sensing electrodes in areas other than the first region and the region including at least a portion of the second region can be the same as the UL signal transmitted by the touch-sensing electrodes in the first region. Alternatively, the UL signal transmitted by the touch-sensing electrodes in these other regions can be a variable signal with a different amplitude than the UL signal transmitted by the touch-sensing electrodes in the first region.

[0073] For example, Figures 7A-7B A schematic diagram of this implementation is shown.

[0074] Figures 7A-7B Schematic diagrams illustrating signals sent to touch-sensing electrodes in a first region, a second region, and other regions besides the first and second regions are shown using different patterns. Figure 7A This is an example of sending a ground voltage signal to the touch sensing electrodes in other areas, and Figure 7B This is an example of sending a high-impedance signal to the touch sensing electrodes in the other area. Figures 7A-7B In this context, we can take the example of at least a portion of the region including only the second region.

[0075] For example, in Figures 7A-7B In the embodiment shown, the intensity of the UL signal received by the active pen (Pen) UL It can be represented as Pen UL =|Panel UL –Body UL |, where Panel UL Body represents the intensity of the UL signal transmitted by the touch sensing electrodes in the first region and other regions besides the first and second regions. UL This indicates the strength of the UL interference signal transmitted to the active pen through the human body (palm). Therefore, by sending an anti-interference signal to the touch sensing electrodes in the second area and sending UL signals to the touch sensing electrodes in areas other than the first and second areas, the strength of the UL signal received by the active pen can be enhanced compared to sending UL signals only to the touch sensing electrodes in the first area (though there may be some sacrifice compared to sending UL signals across the entire area). When the strength of the UL signal received by the active pen... UL Compared to 6A-6B and Figures 4A-4B The situation shown is correspondingly enhanced, and sufficient strength can be guaranteed to combat other noise interference, so the sensing effect of the active pen can be further improved.

[0076] Therefore, in reference Figures 7A-7BIn the described implementation, not only can the intensity of interference signals transmitted to the active pen through the human body be reduced, but the intensity of the UL signal received by the active pen can also be ensured to be high enough to resist interference from other noises, thus further improving the sensing effect of the active pen.

[0077] Additionally, in some cases, when a human body (e.g., a palm) touches the touch display panel, and as described above, after determining the first area, a UL signal is sent to the touch sensing electrodes within the first area, and a DC voltage signal as an anti-interference signal is sent to the touch sensing electrodes in all areas other than the first area (including the second area), for example... Figure 6A As shown, if the human body touches the same area as the active pen, some UL signal may still be coupled to the human body (e.g., the palm), and then coupled to the pen shell through the human body. In this case, the strength of the UL signal received by the active pen may be reduced too much, which may cause the active pen to lose the UL signal.

[0078] Therefore, in some other embodiments of this disclosure, the problem can also be solved by setting a buffer zone near the first region.

[0079] For example, in some embodiments, the driving method 500 may further include: designating the area corresponding to the touch sensing electrodes on a third preset number of columns adjacent to the first area as a third area (buffer area); and during the UL transmission period, sending a buffer signal to the touch sensing electrodes in the third area, and sending a DC voltage signal as the anti-interference signal to the touch sensing electrodes in all areas of the touch display panel other than the first area and the buffer area, where the at least part of the area mentioned in step S530 does not include the third area.

[0080] Optionally, the buffer signal may include a high-impedance signal or a signal with an amplitude smaller than that of the UL signal.

[0081] In other words, the third region can serve as a buffer region adjacent to the first region, in which the touch sensing electrodes are sent buffer signals to buffer the reduction in the intensity of the UL signal actually received by the active pen, thereby preventing the active pen from losing the UL signal.

[0082] In this way, even if the human touch position is close to the active pen touch position, that is, the second area and the first area are close together, the strength of the UL signal actually received by the active pen will not be reduced, thus avoiding the loss of UL signal by the active pen.

[0083] As mentioned earlier, the problem of the active pen losing the UL signal usually occurs when the human body (e.g., palm) touches the active pen and the touch point are close together. However, if the human body (e.g., palm) touches the active pen and the touch point are far apart, the problem of the active pen losing the UL signal is less likely to occur. For example, if the distance between the second area and the first area is too large, that is, the human body touch point is far from the active pen touch point (or the first area), the strength of the UL signal coupled to the human body (e.g., hand) is also very low, which has little impact on the strength of the UL signal actually received by the active pen. This will not significantly affect the active pen's sensing of the UL signal. Furthermore, if the distance between the second area and the first area is too small, it may not be sufficient to set up a buffer area (at least including a third preset number of columns of touch sensing electrodes, which would provide better buffering).

[0084] In the above embodiments, the distance between the human touch position and the active pen touch position is not considered. Instead, a third region is set directly near the edge of the first region. This simplifies the determination process, saves computing power, and improves the chip's processing efficiency.

[0085] In other embodiments, the buffer area can be configured based on the distance between the human body (e.g., palm) touch location and the active pen touch location, which is also equivalent to the distance between the first and second regions. This distance can be represented by, for example, the number of electrode rows between the electrode rows where the human body touch location is located and the electrode rows where the active pen touch location is located, or the distance between the coordinates of the electrode rows where the human body touch location is located and the coordinates of the electrode rows where the active pen touch location is located, or the distance between the more precise coordinates of the human body touch location and the more precise coordinates of the active pen touch location. For example, the driving method 500 may further include: acquiring the human touch position, then determining the distance between the active pen touch position and the human touch position (or determining the distance between the first region and the second region after determining the second region), and when the distance is within a threshold range between a first threshold and a second threshold, the region corresponding to the touch sensing electrodes of a third preset number of columns adjacent to the first region can be taken as the third region, and a buffer signal is sent to the touch sensing electrodes in the third region during the UL transmission period, and a DC voltage signal as the anti-interference signal is sent to the touch sensing electrodes in all regions on the touch display panel except the first region and the third region, so that the at least part of the region (to which the anti-interference signal is sent to the touch sensing electrodes) mentioned in step S530 includes the region corresponding to the human touch position (or the second region) and does not include the third region.

[0086] Optionally, the distance between the active pen touch location and the human body touch location, or the distance between the first region and the second region, can be directly related to the number of rows of touch sensing electrodes included between them.

[0087] Additionally, as mentioned above, the buffer signal may include a high-impedance signal or a signal with an amplitude smaller than that of the UL signal.

[0088] In other words, in these implementations, a buffer area is only set when the distance between the active pen touch position and the human touch position, or the distance between the first area and the second area, meets the threshold condition.

[0089] Figure 8 A schematic diagram of an implementation method for setting up a buffer area is shown.

[0090] like Figure 8 As shown, different patterns illustrate the signals sent to the touch sensing electrodes in the first region, the second region, and the buffer region (third region).

[0091] exist Figure 8 In the process, a DC voltage signal (GND) is sent to the touch sensing electrodes in the second area of ​​human (palm) contact, a high-impedance signal (HiZ) is sent to the touch sensing electrodes in the buffer area, and a UL signal (UL) is sent to the touch sensing electrodes in the first area. The solid black line represents the change in the intensity of the UL signal received by the active pen when the human body is not in contact with or near the touch display panel, and the dashed black line represents the change in the intensity of the UL signal received by the active pen when the human body is in contact with or near the touch display panel.

[0092] from Figure 8 It can be seen that when a human body touches or approaches the touch display panel, the intensity of the UL signal received by the active pen will decrease to a certain extent, but it is still of a sufficient magnitude, and the intensity changes gradually, thus ensuring that the active pen can normally sense the UL signal.

[0093] Alternatively, the driving method 500 may also include: when the distance between the active pen touch position and the human touch position is less than a first threshold, i.e. there is not enough area space to set a third area, a buffer area may not be set.

[0094] Without setting a buffer area, the driving method described above can be referenced. For example, a UL signal can be sent to the touch sensing electrodes in the first area, and an anti-interference signal can be sent to the touch sensing electrodes in other areas outside the first area. If a buffering effect is desired, the anti-interference signal can be selected as a high-impedance signal or a signal with an amplitude smaller than the UL signal.

[0095] Optionally, the driving method 500 may further include: when the distance between the active pen touch position and the human touch position is greater than a second threshold, the strength of the UL signal coupled to the human hand is also very low, which has little impact on the strength of the UL signal actually received by the active pen. Therefore, a buffer area may not be set, and the driving circuit may send a DC voltage signal, a high-impedance signal, or a signal with an amplitude smaller than the UL signal to the touch sensing electrodes in other areas outside the first area.

[0096] Similarly, for example, a UL signal can be sent to the touch sensing electrodes within the first region, while an anti-interference signal can be sent to the touch sensing electrodes in other regions outside the first region (including the second region). The anti-interference signal can also be selected as a DC voltage signal, a high-impedance signal, or a signal with an amplitude smaller than the UL signal.

[0097] Therefore, by determining whether to set a buffer zone based on the distance between the active pen touch position and the human touch position, more precise driving can be achieved.

[0098] Therefore, in the embodiment described with reference to Figures 5-8, by sending anti-interference signals to the touch sensing electrodes in at least a portion of the area outside the first region (determined based on the active pen touch position), the signal strength of the interference signals transmitted to the active pen through the human body can be reduced, thereby improving the sensing effect of the active pen. Furthermore, by sending UL signals to the touch sensing electrodes in other areas on the touch display panel besides at least the first and second regions, the reception strength of the active pen's UL signal can be ensured to be high enough to resist interference from other noises, thus further improving the sensing effect of the active pen. In addition, by setting a buffer area near the first region, the problem of the active pen losing its UL signal when the active pen touch position and the human body touch position are close can be prevented, thereby ensuring the normal operation of the active pen.

[0099] As mentioned above, when sending anti-interference signals to touch sensing electrodes in areas other than the first area on the touch display panel, the strength of the UL signal received by the active pen may be insufficient to resist interference from other noise. Therefore, in addition to sending UL signals to touch sensing electrodes in areas other than the first and second areas, according to some other embodiments of this disclosure, different methods of sending drive signals can also achieve the effect of ensuring that the strength of the UL signal received by the active pen is sufficiently high to resist interference from other noise.

[0100] Figure 9 A schematic flowchart of a driving method 900 according to another embodiment of the present disclosure is shown.

[0101] like Figure 9As shown, in step S910, the location of human touch is obtained.

[0102] For example, as described above with reference to Figures 5-8, human touch locations can be detected during each touch detection period, and the obtained human touch locations are the most recent human touch locations detected in time.

[0103] In step S920, the human touch area on the touch display panel is determined based on the human touch location.

[0104] Optionally, the human touch area includes the area corresponding to all touch sensing electrodes in the column where the human touch location is located; or the human touch area includes the area corresponding to all touch sensing electrodes in the column where the human touch location is located and the adjacent second predetermined number of columns.

[0105] Optionally, there can be one or more human touch areas.

[0106] Then, in step S930, during the UL transmission period, a UL signal is sent to the touch sensing electrodes in the human touch area, and an anti-interference signal is sent to the touch sensing electrodes in at least a portion of the touch display panel other than the human touch area.

[0107] Similarly, the UL signal sent to the touch sensing electrodes in the human body touch area during the UL transmission period is transmitted to the active pen through the human body.

[0108] Optionally, during UL transmission, anti-interference signals can be sent to the touch sensing electrodes in all areas of the touch display panel except for the area touched by the human body. In this way, for the sensing circuit inside the active pen, the anti-interference signal and the UL signal can be regarded as signals with opposite directions.

[0109] Optionally, during UL transmission, an anti-interference signal can be sent to touch sensing electrodes on the touch display panel in an area that includes at least the area corresponding to the active pen touch position, excluding the human touch area. The area corresponding to the active pen touch position can be the first area determined in the embodiments described above with reference to Figures 5-8. In this case, the driving method 900 may further include: acquiring the active pen touch position; and determining the area corresponding to the active pen touch position based on the active pen touch position.

[0110] For example, the method for determining the region corresponding to the active pen touch position can be similar to the method for determining the first region. For instance, the region corresponding to all touch sensing electrodes in the column where the active pen touch position is located, as well as in the column with a first preset number of adjacent columns, can be determined as the region corresponding to the active pen touch position. Alternatively, considering that the active pen may move, the region corresponding to all touch sensing electrodes in the column where the active pen touch position is located, as well as in the column with a first preset number of adjacent columns, can be determined as the region corresponding to the active pen touch position. Or, based on at least one active pen touch position within a previously predetermined time period, the touch range and / or movement speed of the active pen can be determined, and the region corresponding to the active pen touch position can be determined based on the touch range and / or movement speed of the active pen.

[0111] For example, Figures 10A-10B A schematic diagram illustrating a specific implementation of this embodiment is shown.

[0112] like Figure 10A and Figure 10B As shown, different patterns illustrate the signals sent by touch-sensing electrodes to the human touch area and other areas besides the human touch area. Figure 10A This is an example of sending a ground voltage signal to touch sensing electrodes in areas other than the area touched by the human body, and Figure 10B This is an example of sending a high-impedance signal (HiZ) to touch sensing electrodes in areas other than the area touched by the human body.

[0113] Specifically, as an example, such as Figure 10A As shown, a UL signal is sent to the touch sensing electrodes within the human touch area, and a ground voltage signal is sent to the touch sensing electrodes in areas other than the human touch area. This allows the strength of the UL signal transmitted to the active pen through the touch sensing electrodes in these areas (excluding the human touch area) to be adjusted (using a panel). UL (Indicated by) the lowest, for example, close to 0, the intensity of the UL signal transmitted from the touch-sensing electrodes in the human touch area to the pen shell of the active pen (in body). UL The value of Pen is relatively large, therefore, according to the expression for the strength of the UL signal received by the active pen, Pen... UL =|Panel UL –Body UL It can be seen that Pen UL If the value is greater than 0 and the corresponding UL signal strength is relatively high, the active pen can also have a good sensing effect.

[0114] As another example, such as Figure 10BAs shown, a UL signal is sent to the touch sensing electrodes within the human touch area, and a high-impedance signal HiZ (i.e., floating) is sent to the touch sensing electrodes in areas other than the human touch area. Thus, the voltage of the touch sensing electrodes in areas other than the human touch area will fluctuate due to environmental influences. For example, the contact between the stylus and the human body can cause the voltage of the touch sensing electrode set to HiZ to change. These touch sensing electrodes may also couple a small amount of UL signal. For example, the strength of the UL signal transmitted to the stylus from the touch sensing electrodes in these areas other than the human touch area (using a panel)... UL The value (indicated by Body) will have a relatively small value; it represents the strength of the UL signal transmitted from the touch-sensing electrodes within the human touch area to the pen casing of the active pen (indicated by Body). UL The value of Pen is relatively large, therefore, according to the expression for the strength of the UL signal received by the active pen, Pen... UL =|Panel UL –Body UL It can be seen that Pen UL If the value is greater than 0 and the corresponding signal strength is relatively large, the active pen can also have a good sensing effect. Furthermore, the difference between the intensity of the UL signal received by the pen shell from the touch sensing electrode in the human body's touch area and the intensity of the UL signal received from the touch sensing electrode in the area (first area) corresponding to the active pen's touch position is reduced, which can also have a buffering effect. If the human body's touch position and the active pen's touch position are close together, it can also prevent the active pen from losing the UL signal and thus failing to complete the sensing.

[0115] Therefore, by combining Figure 9-10B The described driving method can send a UL signal to the touch sensing electrodes in the human touch area and send an anti-interference signal to the touch sensing electrodes in the area corresponding to at least the active pen touch position, so that the active pen can still receive a strong UL signal and thus resist interference from other noise.

[0116] According to another aspect of this disclosure, a driving circuit for a touch display panel is also provided. The touch display panel can be as follows: Figure 2 The touch display panel in the touch display device shown, and the driving circuit can be Figure 2 The driving circuit in it.

[0117] Figure 11 A schematic diagram of a driving circuit according to an embodiment of the present disclosure is shown. The touch display panel may be as follows: Figure 2 As shown, it has multiple touch sensing electrodes arranged in an array.

[0118] like Figure 11As shown, the driving circuit 1100 may include a signal generation module 1110, a touch sensing module 1120, and a control module 1130.

[0119] It should be noted that Figure 11 Only the circuit modules related to the driving process of touch sensing in the driving circuit are shown. If the driving circuit is a chip such as TDDI or FTDI, the driving circuit may also include circuit modules related to display driving and / or fingerprint recognition, or the circuit modules shown may also be associated with the operation of display driving and / or fingerprint recognition. In order not to obscure the inventive spirit of the embodiments of this disclosure, they are omitted here.

[0120] exist Figure 11 In this context, the signal generation module 1110 can be used to generate uplink (UL) signals and anti-interference signals.

[0121] Different signals (i.e. UL signals and anti-interference signals) generated by the signal generation module 1110 are sent to the touch sensing electrodes of the touch display panel during corresponding time periods. In other words, during the UL transmission period, either the UL signal or the anti-interference signal is selectively sent to each of the plurality of touch sensing electrodes.

[0122] The touch sensing module 1120 is used to receive DL signals from multiple touch sensing electrodes of the touch display panel during the downlink (DL) transmission period of the active pen, the DL signals being used to determine the touch position of the active pen.

[0123] For example, during the DL transmission period, the touch sensing module can receive DL signals from multiple touch sensing electrodes on the touch display panel. These DL signals are sent to the touch sensing electrodes by an active pen, and the DL information carried by the DL signals can be used to determine the active pen touch position. After the touch sensing module performs preliminary processing on the received DL signals (e.g., noise reduction, filtering, etc.), the position processing module can determine whether an active pen touch event has occurred at these touch sensing electrodes, for example, determining the active pen touch position. Optionally, the position processing module can be included in the touch sensing module 1120, or it can be included in the control module 1130, or it can be a separate module; this disclosure does not limit this.

[0124] The control module 1130 is used to: acquire the active pen touch position; determine a first area on the touch display panel based on the active pen touch position; and during the UL transmission period, control the transmission of UL signals to the touch sensing electrodes in the first area and to transmit anti-interference signals to the touch sensing electrodes in at least a portion of the touch display panel other than the first area.

[0125] In this way, by sending UL signals only to the first area on the touch display panel and sending anti-interference signals to other areas (including the area corresponding to the human touch position), the signal strength of UL interference signals transmitted to the active pen through the human body can be reduced, thereby improving the sensing effect of the active pen.

[0126] Optionally, the control module 1130 can also be used to: acquire the human touch position; determine a second area on the touch display panel based on the human touch position, wherein the at least part of the area mentioned above, excluding the first area, includes the second area; and during the UL transmission period, control the transmission of an anti-interference signal to the touch sensing electrodes in the second area, thereby avoiding the intensity of interference signals transmitted from the human body to the active pen. Optionally, to enhance the intensity of the UL signal received by the active pen, the control module can further control the transmission of UL signals to the touch sensing electrodes in the area on the touch display panel excluding the first area and the aforementioned at least part of the area including the second area.

[0127] This not only reduces the intensity of interference signals transmitted to the active pen through the human body, but also ensures that the intensity of the UL signal received by the active pen is high enough to resist interference from other noises, thus further improving the sensing effect of the active pen.

[0128] Optionally, to determine the location of a human touch, the touch sensing module 1120 can also be used to send touch excitation signals from the plurality of touch sensing electrodes during the touch detection period and receive sensing signals therefrom, and the sensing signals can be used to determine the location of a human touch. For example, in... Figure 3 Each touch driving period shown provides touch excitation signals to a portion of the touch sensing electrodes in a time-sharing or simultaneous manner, and receives sensing signals from these touch sensing electrodes. Similarly, the position processing module in the driving circuit can also determine the human touch position based on the processing result obtained by the touch sensing module after preliminary processing of the sensing signals (e.g., noise reduction, filtering, etc.). In addition, the touch excitation signals that the touch sensing module needs to send to the touch sensing electrodes when performing touch detection can also be generated by the signal generation module 1110.

[0129] In addition, in some other embodiments, to avoid the loss of UL signal due to excessive reduction in the intensity of the UL signal received by the active pen being too close to the human body's touch position, a buffer area can be set next to the first area.

[0130] Therefore, the control module 1130 is further configured to: designate the area corresponding to the touch sensing electrodes of a third preset number of columns adjacent to the first area as the third area; and during the UL transmission phase, control the sending of a buffer signal to the touch sensing electrodes in the third area, and send a DC voltage signal as the anti-interference signal to the touch sensing electrodes in all areas of the touch display panel except the first area and the buffer area, wherein at least some of the aforementioned areas do not include the third area.

[0131] Alternatively, a buffer area can be set only when the distance between the active pen touch position and the human touch position is within a threshold range to achieve more precise driving. In this case, the control module 1130 is also used to: acquire the human touch position; determine the distance between the active pen touch position and the human touch position; and when the distance is within the threshold range, take the area corresponding to the third preset number of columns of touch sensing electrodes adjacent to the first area as the third area, send a buffer signal to the touch sensing electrodes in the third area during the UL transmission period, and send a DC voltage signal as the anti-interference signal to the touch sensing electrodes in all areas of the touch display panel except the first area and the third area. In this way, the at least part of the area mentioned in step S530 includes the area corresponding to the human touch area (e.g., the second area) but does not include the third area.

[0132] More details on the above-described operation of control module 1130 can be found in the description above in conjunction with Figure 5-8, so they will not be repeated here.

[0133] Furthermore, the above-described division of the various modules in the drive circuit can be adaptively adjusted according to the actual situation, so that the drive circuit may include more or fewer modules, and this disclosure does not limit this.

[0134] Therefore, by sending anti-interference signals through the driving circuit of this embodiment to the touch sensing electrodes in at least a portion of the area outside the first area, the signal strength of the interference signals transmitted to the active pen through the human body can be reduced, thereby improving the sensing effect of the active pen. Furthermore, by sending UL signals to the touch sensing electrodes in the areas other than the first and second areas on the touch display panel, the reception strength of the UL signal of the active pen can be ensured to be high enough to resist interference from other noises, thus further improving the sensing effect of the active pen. In addition, by setting a buffer area near the first area, the problem of the active pen losing the UL signal when the active pen touch position and the human body touch position are close can be prevented, thereby ensuring the normal operation of the active pen.

[0135] Additionally, according to other embodiments, in order to increase the strength of the UL signal received by the active pen to resist other noise interference, Figure 11 The various modules shown can perform different operations and can be used to solve the problem.

[0136] For example, the signal generation module 1110 can be used to generate uplink (UL) signals, anti-interference signals, and touch excitation signals.

[0137] The touch sensing module 1120 is used to send touch excitation signals to the plurality of touch sensing electrodes and acquire sensing signals therefrom during the touch detection period, wherein the sensing signals can be used to determine the location of human touch.

[0138] The control module 1130 is configured to send a UL signal to the touch sensing electrodes within the human touch area during the UL transmission period, and to send an anti-interference signal to the touch sensing electrodes in at least a portion of the touch display panel other than the human touch area (e.g., the entire area or at least an area including the first area as described above). The UL signal sent to the touch sensing electrodes within the human touch area during the UL transmission period is transmitted to the active pen via the human body. Further details or related operations of the control module 1130 can be found in the foregoing description. Figure 9-10B The content described therein will not be repeated here.

[0139] Therefore, with the driving circuit of this embodiment, a UL signal can be sent by the touch sensing electrode in the human touch area and an anti-interference signal can be sent by the touch sensing electrode in the area corresponding to the active pen touch position, so that the active pen can still sense a large intensity UL signal and thus resist interference from other noise.

[0140] Figure 12 It shows Figure 11 The diagram shows one specific implementation of the driving circuit.

[0141] It should be noted that, although Figure 12 The present invention illustrates one specific implementation of the driving circuit, but those skilled in the art should understand that this is merely an example and should not be construed as a limitation on the design of the driving circuit. Those skilled in the art may adopt other implementation methods based on the disclosure of this invention, all of which are within the protection scope of this disclosure.

[0142] like Figure 12As shown, the signal generation module 1110 may include a UL signal generation circuit, a DC voltage signal generation circuit, and a high-impedance signal generation circuit. The UL signal generation circuit generates a UL signal under the control of the timing control signal of the timing controller. The DC voltage signal generation circuit generates a DC voltage or a grounding node, and the high-impedance signal generation circuit can be a floating node (not connected to other circuits). Furthermore, the UL signal generation circuit can also generate UL signals with different amplitudes (smaller amplitude UL signals can be used as anti-interference signals or buffer signals).

[0143] For example, Figure 12 The example structure of the UL signal generation circuit is given, in which a first switch and a second switch are connected in series between a first voltage node (high level) and a second voltage node (low level), controlled by a timing controller. The connection node of the first and second switches is used to output a UL signal in pulse form that varies between high and low levels. The data output by the timing controller is the encoded instruction to be transmitted to the active pen; therefore, the UL signal output by the UL signal generation circuit carries this encoded instruction. For example, multiple... Figure 12 The example structure in the example can be used to generate multiple UL signals with different amplitudes.

[0144] like Figure 12 As shown, for each touch sensing electrode (RX11, RX12...), the UL signal generation circuit of the signal generation module 1310 can be connected to the touch sensing electrode to send a UL signal to it. Similarly, the DC voltage signal generation circuit or the high impedance signal generation circuit can also be connected to it so that a DC voltage signal or a high impedance signal can be sent to it.

[0145] like Figure 12 As shown, for each touch sensing electrode (RX11, RX12...), the touch sensing electrode can also be connected to an analog front end in the touch sensing module, so that a touch excitation signal can be sent from the analog front end to the touch sensing electrode, or the analog front end can receive a sensing signal and / or a DL signal from the touch sensing electrode, wherein the sensing signal and / or the DL signal is used to determine the human touch position and / or the active pen touch position.

[0146] Specifically, the touch sensing module 1120 may include multiple analog front-ends (AFEs), each of which can be simultaneously connected to a row of touch sensing electrodes during the DL transmission period (e.g., via a selection module as described below) to receive DL signals from them. For example, when the analog front-end is an operational amplifier, one input (first terminal) of the operational amplifier receives a DC voltage signal, and the other input (second terminal) is connected to the selection module as described below, thereby connecting to touch sensing electrodes in the same row based on the selection of the selection module to receive DL signals from that row of touch sensing electrodes. Since the tip of the active pen typically only touches one touch sensing electrode, by connecting each analog front-end to the same row of touch sensing electrodes, the analog front-end can receive the DL signal whenever the pen tip touches any of the touch sensing electrodes in that row, without having to sequentially detect and determine whether a DL signal has been received for each row of touch sensing electrodes. This reduces the time required to receive the DL signal and improves the efficiency of bidirectional communication of the active pen.

[0147] Furthermore, each analog front end can acquire a touch excitation signal from the signal generation module 1310, thereby enabling it to send the touch excitation signal to the connected touch sensing electrode during the touch detection period and receive a sensing signal from it. For example, when the analog front end is an operational amplifier, one input terminal (first terminal) of the operational amplifier receives the touch excitation signal, and the other input terminal (second terminal) is connected to a selection module as described below, thereby connecting to a touch sensing electrode based on the selection of the selection module to send the touch excitation signal to the touch sensing electrode. The operational amplifier then receives the sensing signal from the touch sensing electrode via the selection module and its second terminal. Of course, the touch excitation signal can also be provided to the touch sensing electrode through other circuitry, and is not limited to being provided by the analog front end.

[0148] As mentioned above, the driving circuit needs to selectively provide signals to or receive signals from the touch sensing electrodes of the touch display panel, therefore a selection module can be provided in the driving circuit. Of course, in other embodiments, the selection module can also be provided in the touch display panel, and this disclosure does not limit this.

[0149] The selection module is used to selectively send UL signals or anti-interference signals (and optionally buffered signals) to each of a plurality of touch sensing electrodes on the touch display panel, or to receive sensing signals or DL ​​signals from them, under the control of a selection signal (e.g., from the control module). The selection module can be implemented through combinations of switches. In addition to enabling the selection of touch sensing electrodes as in existing multiplexers (MUX), the selection module can also transmit different signals to each touch sensing electrode connected to it during active pen-related uplink / downlink transmission periods, and can simultaneously provide the same or different signals to different touch sensing electrodes.

[0150] For example, the selection module sets up a selection submodule for each row of touch sensing electrodes, such as a many-to-many selector. Multiple connection terminals on the first side of each many-to-many selector are connected one-to-one with multiple touch sensing electrodes in a row. Multiple connection terminals on the second side of each many-to-many selector are respectively connected to the output terminals of the signal generation module (e.g., UL signal, DC voltage signal, and high-impedance signal each correspond to an output terminal) and the connection terminals of the touch sensing module (e.g., the second terminal of the operational amplifier in the analog front end). Thus, by controlling the selection signal, each touch sensing electrode can be selectively connected to the respective output terminals of the signal generation module and the connection terminals of the touch sensing module for signal transmission and reception. Furthermore, the case of setting up a selection submodule for each column of touch sensing electrodes is similar, and therefore will not be described again here.

[0151] In addition, multiple many-to-many selectors (e.g., multiplexers MUX) and multiple analog front-ends (AFEs) can be in one-to-one correspondence, that is, each row of touch sensing electrodes is connected to the same analog front-end via a many-to-many selector, but this disclosure is not limited thereto.

[0152] Depending on the design requirements, the control module can be implemented in hardware, firmware, software (i.e., program) or a combination of many of the above three forms.

[0153] In terms of hardware implementation, the control module can be implemented in logic circuits on an integrated circuit. The functions of the control module can be implemented in hardware using a hardware description language (e.g., Verilog HDL or VHDL) or other suitable programming languages. For example, the functions of the control module can be implemented in various logic blocks, modules, and circuits within one or more controllers, microcontrollers, microprocessors, application-specific integrated circuits (ASICs), digital signal processors (DSPs), field-programmable gate arrays (FPGAs), and / or other processing units.

[0154] In both software and / or firmware form, the relevant functions of the control module can be implemented in logic circuitry on an integrated circuit. For example, the control module can be implemented using a general-purpose programming language (e.g., C or C++) or other suitable programming languages. Programming code can be recorded / stored on a recording medium, which includes, for example, read-only memory (ROM), storage devices, and / or random access memory (RAM). The programming code can be accessed from the recording medium and executed by a computer, central processing unit (CPU), controller, microcontroller, or microprocessor to perform the relevant functions. For the recording medium, "non-transitory computer-readable media" such as magnetic tape, disk, card, semiconductor memory, or programming logic circuitry can be used. Additionally, the program can be provided to the computer (or CPU) via any transmission medium (e.g., a communication network or radio waves). A communication network is, for example, the Internet, wired communication, wireless communication, or other communication media.

[0155] Figures 13A-13D It shows different time periods Figure 12 The drive circuit selection module shown connects the touch sensing electrodes to the signal generation module and the touch sensing module. The figure schematically illustrates the connection of the first side of the multiple-to-multiple selector SEL1 to the first row of touch sensing electrodes (RX11, RX12...).

[0156] like Figure 13A As shown, taking touch sensing based on column-by-column scanning as an example, during the touch detection period (each touch detection period can complete a portion of the touch sensing electrodes (e.g., Figure 13AWhen a touch is sensed at a touch sensing electrode (in a certain column of the image), a many-to-many selector SEL1 can connect the first touch sensing electrode RX11 of the first row to the analog front-end AFE1 in the touch sensing module to which the many-to-many selector SEL1 is connected. Thus, the analog front-end AFE1 can send a touch excitation signal to the touch sensing electrode RX11 and receive a sensing signal from it. Simultaneously, although not shown, the other many-to-many selectors (e.g., SEL2, SEL3, ...) also connect their corresponding first touch sensing electrodes (e.g., RX21, RX31, ...) in their respective rows to the corresponding analog front-ends (e.g., AFE2, AFE3, ...). In this way, N analog front-ends can simultaneously receive N sensing signals for N touch sensing electrodes.

[0157] Then, the many-to-many selector SEL1 continues to connect the second touch sensing electrode RX12 of the first row to the analog front end AFE1. At the same time, the remaining many-to-many selectors (e.g., SEL2, SEL3, ...) also connect the second touch sensing electrode (e.g., RX22, RX32, ...) on their respective rows to their respective analog front ends (e.g., AFE2, AFE3, ...), and so on.

[0158] like Figure 13B As shown, assuming the active pen touch location has been determined to be touch sensing electrode RX22, during the UL transmission period, the many-to-many selector SEL1 can connect touch sensing electrode RX22 to the UL signal generation circuit to send a UL signal to touch sensing electrode RX22. Simultaneously, touch sensing electrodes in the same column as touch sensing electrode RX22 (RX12, RX32, etc.) or in adjacent columns (e.g., the first region mentioned earlier, or touch sensing electrodes included in other regions besides the first region and at least a portion of the second region mentioned earlier) also need to send UL signals. These touch sensing electrodes are also connected to the UL signal generation circuit. The figure shows touch sensing electrode RX12 in the same column as touch sensing electrode RX22 connected to the UL signal generation circuit. Touch sensing electrode RX11 in an adjacent column to RX22 can also be connected to the UL signal generation circuit to receive UL signals.

[0159] Meanwhile, for the remaining touch sensing electrodes that do not need to send UL signals, their corresponding many-to-many selectors will also connect them to the DC voltage generation circuit or floating node during the UL transmission period.

[0160] like Figure 13CAs shown, assuming the touch position of the active pen is determined to be the touch sensing electrode RX22 and the touch position of the human body (e.g., the palm) is at RX55, the area corresponding to the second column of touch sensing electrodes can be defined as the first area, and the area corresponding to the fifth column of touch sensing electrodes can be defined as the second area. Since the distance between the two areas is relatively close, a buffer area can be set (e.g., including two columns of touch sensing electrodes (the third and fourth columns)). Thus, during the UL transmission period, a UL signal is sent to the second column of touch sensing electrodes, a DC voltage signal (anti-interference signal) is sent to the fifth column of touch sensing electrodes, and a buffer signal (H iz) is sent to the third and fourth column of touch sensing electrodes. Figure 13C The image shows a row of touch sensing electrodes.

[0161] RX21, RX22, RX23, RX24, RX25… Therefore, the multiplexer SEL 2 connects the touch sensing electrode RX22 in column 2 to the UL signal generation circuit, connects the touch sensing electrodes RX23 and RX24 in columns 3 and 4 to the floating node, and connects the touch sensing electrode RX25 in column 5 to the DC voltage generation circuit. For the touch sensing electrodes in the remaining columns, UL signals or anti-interference signals can be sent to them, and correspondingly connected to the corresponding circuits in the signal generation module via multiplexers.

[0162] like Figure 13D As shown, during the DL transmission period of the active pen, each many-to-many selector can connect (short-circuit) its corresponding row of touch sensing electrodes. The figure shows the second row of touch sensing electrodes RX21, RX22… connected and then connected to the second terminal of the analog front-end AFE2 corresponding to the many-to-many selector SEL2. The first terminal of AFE2 is connected to a DC voltage Vref. The DL signal (if any) is received through this analog front-end.

[0163] According to another aspect of this disclosure, a touch display device is also provided. This touch display device can be... Figure 2 The touch display device shown may include: a touch display panel including a plurality of touch sensing electrodes for touch sensing during a touch detection period, transmitting a UL signal to an active pen during an uplink (UL) transmission period, and receiving a DL signal from the active pen during a downlink (DL) transmission period; and as shown in the reference... Figure 11-13D The aforementioned driving circuit.

[0164] Alternatively, the display panel and touch sensor in the touch display panel can be arranged in an on-cell or in-cell manner.

[0165] Examples of the touch display device may be mobile devices, personal computers, tablets, personal digital assistants, etc., and this disclosure does not limit them.

[0166] Those skilled in the art will understand that various modifications and variations can be made to the structure of the disclosed embodiments without departing from the scope or spirit of this disclosure. In view of the foregoing, it is intended that this disclosure cover modifications and variations of this disclosure that fall within the scope of the appended claims and their equivalents.

Claims

1. A driving method for a touch display panel, the touch display panel including a plurality of touch sensing electrodes, the driving method comprising: Obtain the location of active pen touch; A first area on the touch display panel is determined based on the location of the active pen touch; During the uplink transmission period, an uplink signal is sent to the touch sensing electrodes in the first area, and an anti-interference signal is sent to the touch sensing electrodes in a second area on the touch display panel that is different from the first area. Specifically, the uplink signal sent to the touch sensing electrodes in the first area during the uplink transmission period is used to send to the active pen. The method further includes: During the uplink transmission period, a buffered signal, different from the uplink signal and the anti-interference signal, is sent to the touch sensing electrodes in the third region, which is adjacent to the first region and located between the first region and the second region.

2. The driving method according to claim 1, wherein, Determining the first area on the touch display panel based on the location of the active pen touch includes: The area corresponding to all touch sensing electrodes in the column where the active pen touches the location and the adjacent first preset number of columns is defined as the first area; or Based on at least one active pen touch location within a previously predetermined time period, the touch range and / or movement speed of the active pen are determined, and the first region is determined based on the touch range and / or movement speed of the active pen.

3. The driving method according to claim 1 further includes: Obtain the location of human touch; The second region is determined based on the location of human touch. as well as During the uplink transmission period, the uplink signal is sent to the touch sensing electrodes in a fourth region on the touch display panel that is different from the first region, the second region, and the third region.

4. The driving method according to claim 3, wherein, The second region includes the region corresponding to all touch sensing electrodes in the column where the human body touches the location, or the region corresponding to all touch sensing electrodes in the column where the human body touches the location and the adjacent second preset number of columns.

5. The driving method according to any one of claims 1-4, wherein, The anti-interference signal sent to the touch sensing electrodes in the second region includes: DC voltage signal; or High-impedance signal; or A signal with an amplitude smaller than that of the uplink signal.

6. The driving method according to claim 1, wherein, The buffered signal includes a high-impedance signal or a signal with an amplitude smaller than the uplink signal, and the driving method further includes: The area corresponding to the touch sensing electrodes on a third preset number of columns adjacent to the first area is defined as the third area.

7. The driving method according to claim 6, further comprising: Obtain the location of human touch; Determine the distance between the active pen touch position and the human body touch position; The step of designating the area corresponding to the touch sensing electrodes on a third preset number of columns adjacent to the first area as the third area is performed in response to the distance being within a threshold range.

8. The driving method according to claim 1, further comprising: During the downlink transmission period of the active pen, a downlink signal is acquired from the active pen, wherein the downlink signal carries downlink information and is used to detect the touch position of the active pen. The location of human touch is detected during the touch detection period, and each touch detection period does not overlap with each downlink transmission period in time.

9. The driving method according to claim 3, wherein, The obtained active pen touch position and / or human touch position are the previously detected active pen touch position and / or human touch position that are closest in time.

10. A driving circuit for a touch display panel, the touch display panel including a plurality of touch sensing electrodes, the driving circuit comprising: A signal generation module is used to generate an uplink signal and an anti-interference signal, wherein the uplink signal or the anti-interference signal is selectively sent to each of the plurality of touch sensing electrodes during the uplink transmission period; as well as A touch sensing module is used to receive downlink signals from the plurality of touch sensing electrodes during the downlink transmission period of the active pen, the downlink signals being used to determine the touch position of the active pen; The control module is used for: Obtain the active pen touch position; A first area on the touch display panel is determined based on the location of the active pen touch; During the uplink transmission period of the active pen, an uplink signal is sent to the touch sensing electrodes in the first area, and an anti-interference signal is sent to the touch sensing electrodes in a second area on the touch display panel that is different from the first area. The uplink signal sent to the touch sensing electrodes in the first area during the uplink transmission period is used to send to the active pen. The signal generation module is further configured to generate a buffered signal, which is selectively sent to each of the plurality of touch sensing electrodes during the uplink transmission period. This buffered signal is distinct from both the uplink signal and the anti-interference signal. The control module is also configured to: During the uplink transmission period, the buffer signal is sent to the touch sensing electrode in the third region, which is adjacent to the first region and located between the first region and the second region.

11. The driving circuit according to claim 10, wherein, The touch sensing module is also used to send touch excitation signals to the plurality of touch sensing electrodes during the touch detection period, and to receive sensing signals from them, the sensing signals being used to determine the location of human touch, and The control module is further used for: Obtain the location of the human body touch; The second region is determined based on the location of human touch. During the uplink transmission period, the control sends the uplink signal to the touch sensing electrodes in a fourth region on the touch display panel that is different from the first region, the second region, and the third region.

12. The driving circuit according to claim 11, wherein, The second region includes the region corresponding to all touch sensing electrodes in the column where the human body touches the location, or the region corresponding to all touch sensing electrodes in the column where the human body touches the location and the adjacent second preset number of columns.

13. The driving circuit according to any one of claims 10-11, wherein, The anti-interference signal sent to the touch sensing electrodes in the second region includes: DC voltage signal; or High-impedance signal; or A signal with an amplitude smaller than that of the uplink signal.

14. The driving circuit according to claim 10, wherein, in, The buffered signal includes a high-impedance signal or a signal with an amplitude smaller than that of the uplink signal. The control module is also used for: The area corresponding to the touch sensing electrodes on a third preset number of columns adjacent to the first area is defined as the third area.

15. The driving circuit according to claim 14, wherein, The control module is also used for: Obtain the location of human touch; and Determine the distance between the active pen touch position and the human body touch position; The control module determines that the third region is executed in response to the distance being within a threshold range.

16. The driving circuit according to claim 11, wherein, The obtained active pen touch position and / or human touch position are the previously detected active pen touch position and / or human touch position that are closest in time.

17. A touch display device, comprising: The touch display panel includes multiple touch sensing electrodes for touch sensing during the touch detection period, sending uplink signals to the active pen during the uplink transmission period, and receiving downlink signals from the active pen during the downlink transmission period of the active pen. as well as The driving circuit as described in any one of claims 10-16.

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