Touch driving chip, touch display panel, driving method of touch display panel and storage medium

Abstract

The invention relates to a touch driving chip, a touch display panel, a driving method of the touch display panel and a storage medium. The touch driving chip is used for obtaining a shielding interval corresponding to a display line synchronizing signal in an asynchronous mode, and adjusting the duty ratio of a touch driving signal according to the shielding interval, so that the target time period of the touch driving signal is located outside the effective time period of the shielding interval; wherein under the condition that a target time period of the touch driving signal is located in an effective time period of the shielding interval, the touch driving signal is interfered by noise, and the target time period comprises at least one of a charging time period and a discharging time period. By the adoption of the touch driving chip, interference in the charging process and the discharging process of the touch driving signal can be reduced, the signal-to-noise ratio of the touch driving signal is increased, and therefore the stability of the touch function is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a touch driver chip, a touch display panel and a driving method thereof, and a storage medium. Background Art

[0002] The touch display panel with touch function allows users to operate the terminal by touch, making human-computer interaction more convenient.

[0003] The touch display panel includes touch electrodes and cathode layers, which are often close to each other. Therefore, the power signal in the cathode layer is likely to interfere with the touch drive signal of the touch electrode, coupling the displayed noise to the touch electrode, causing the touch function to fail. Summary of the invention

[0004] Based on this, it is necessary to provide a touch driver chip, a touch display panel and its driving method, and a storage medium to address the above-mentioned technical problems, which can reduce the interference in the charging and discharging processes of the touch driver signal and improve the signal-to-noise ratio of the touch driver signal, thereby ensuring the stability of the touch function.

[0005] In the first aspect, the present application provides a touch driver chip, which is used to obtain a shielding interval corresponding to a display row synchronization signal in an asynchronous mode, and adjust the duty cycle of the touch driver signal according to the shielding interval so that a target time period of the touch driver signal is outside an effective time period of the shielding interval; wherein, when the target time period of the touch driver signal is within the effective time period of the shielding interval, the touch driver signal is interfered by noise, and the target time period includes at least one of a charging time period and a discharging time period.

[0006] The above touch driving chip realizes touch detection and touch function by providing touch driving signals to the touch driving electrodes. By obtaining the shielding interval corresponding to the display line synchronization signal and adjusting the duty cycle of the touch driving signal according to the shielding interval, the target period of the touch driving signal can be located outside the effective period of the shielding interval, thereby reducing the interference of the charging and discharging processes of the touch driving signal, improving the signal-to-noise ratio of the touch driving signal, and ensuring the stability of the touch function.

[0007] In a second aspect, the present application provides a touch display panel, comprising: touch electrodes, a data driving component and the touch driving chip as described above, wherein the touch electrodes comprise touch driving electrodes and touch sensing electrodes;

[0008] The data driving component is used to generate a data signal in response to a row synchronization signal, and the data signal includes a jump period and a maintenance period; wherein the jump period of the data signal corresponds to the valid period of the row synchronization signal, and the maintenance period of the data signal corresponds to the invalid period of the row synchronization signal.

[0009] The above-mentioned touch display panel includes touch electrodes, data drive components and the above-mentioned touch drive chip, the touch drive chip is connected to the touch drive electrode, and touch detection is realized by providing a touch drive signal to the touch drive electrode to realize the touch function. The touch drive chip obtains the shielding interval corresponding to the display line synchronization signal, and adjusts the duty cycle of the touch drive signal according to the shielding interval, so that the target time period of the touch drive signal is located outside the effective time period of the shielding interval, reducing the interference of the charging process and the discharging process of the touch drive signal, improving the signal-to-noise ratio of the touch drive signal, ensuring the stability of the touch function, and at the same time, reducing the interference of the touch drive signal on the data signal, and improving the display effect of the touch display panel.

[0010] In a third aspect, the present application provides a method for driving a touch display panel, the driving method comprising:

[0011] In the asynchronous mode, obtaining the shielding interval corresponding to the display line synchronization signal;

[0012] The duty cycle of the touch drive signal is adjusted according to the shielding interval so that a target time period of the touch drive signal is outside an effective time period of the shielding interval; wherein, when the target time period of the touch drive signal is within the effective time period of the shielding interval, the touch drive signal is interfered by noise, and the target time period includes at least one of a charging time period and a discharging time period.

[0013] In a fourth aspect, the present application further provides a touch display panel, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned method when executing the computer program.

[0014] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method described above are implemented.

[0015] The above-mentioned display panel driving method, touch display panel and computer-readable storage medium can make the target time period of the touch drive signal outside the effective time period of the shielding interval by obtaining the shielding interval corresponding to the display line synchronization signal in the asynchronous mode and adjusting the duty cycle of the touch drive signal according to the shielding interval, thereby reducing the interference of the charging and discharging processes of the touch drive signal, improving the signal-to-noise ratio of the touch drive signal, and ensuring the stability of the touch function. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the structure of a touch display panel of conventional technology;

[0018] Figure 2 This is a schematic diagram of an application scenario of a touch driver chip in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of a touch driving chip adjusting a duty cycle of a touch driving signal in an embodiment of the present application;

[0020] Figure 4 A timing diagram of a touch driving signal and a display signal in a synchronous mode and an asynchronous mode in a conventional technology;

[0021] Figure 5 A path diagram showing noise introduction in an embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of adjusting a touch driving signal according to a shielding width in an embodiment of the present application;

[0023] Figure 7 is a schematic structural diagram of a touch display panel in an embodiment of the present application;

[0024] Figure 8 Schematic diagram of a process of driving a touch display panel in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 100-touch driver chip, 200-data driver component. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] In the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity. It is understood that when a layer or element is referred to as being "on" another layer or substrate, the layer or element may be directly on the other layer or substrate, or there may be intervening layers. In addition, it is also understood that when a layer is referred to as being "between" two layers, the layer may be the only layer between the two layers, or there may be one or more intervening layers. In addition, the same reference numerals always represent the same elements.

[0031] In the following embodiments, when a layer, region, or element is "connected", it can be interpreted that the layer, region, or element is not only directly connected but also connected through other constituent elements placed therebetween. For example, when a layer, region, element, etc. is described as being connected or electrically connected, the layer, region, element, etc. can be connected or electrically connected not only directly or directly, but also through another layer, region, element, etc. placed therebetween.

[0032] Hereinafter, although terms such as "first", "second", etc. may be used to describe various components, these components are not necessarily limited to the above terms. The above terms are only used to distinguish one component from another. It will also be understood that expressions used in the singular include plural expressions unless the expression in the singular has an obviously different meaning in the context.

[0033] When a statement such as "at least one of..." is placed after a list of elements, it modifies the entire list of elements rather than the individual elements in the list. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0034] Electronic or electrical devices and / or any other related devices or components according to the embodiments of the concepts of the present application described herein (for example, a display device including a display panel and a display panel driver, wherein the display panel driver also includes a drive controller, a gate driver, a gamma reference voltage generator, a data driver, and an emission driver) can be implemented using any appropriate hardware, firmware (such as a dedicated integrated circuit), software, or a combination of software, firmware, and hardware. For example, the various components of these devices may be formed on an integrated circuit (IC) chip or on separate IC chips. In addition, the various components of these devices may be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB), or formed on a substrate. In addition, the various components of these devices may be processes or threads that run on one or more processors in one or more computing devices to execute computer program instructions and interact with other system components to perform the various functions described herein. The computer program instructions are stored in a memory that can be implemented in a computing device using standard storage devices (e.g., such as random access memory (RAM). The computer program instructions can also be stored in other non-transitory computer-readable media (e.g., such as CD-ROMs, flash drives, etc.). Moreover, those skilled in the art should recognize that the functions of various computing devices can be combined or integrated into a single computing device, or the functions of a particular computing device can be distributed on one or more other computing devices without departing from the spirit and scope of the exemplary embodiments of the concepts of the present application.

[0035] Although exemplary embodiments of display modules and display devices including display modules have been specifically described herein, many modifications and variations will be apparent to those skilled in the art. Therefore, it will be understood that display modules and display devices including display modules constructed according to the principles of the present application may be implemented in addition to those specifically described herein. The present application is also defined in the claims and their equivalents.

[0036] As described in the background art, a touch display panel with a touch function allows a user to operate a terminal by touching it, making human-computer interaction more convenient.

[0037] However, the touch display panel includes touch electrodes and cathode layers, which are often close to each other. Therefore, the power signal in the cathode layer is likely to interfere with the touch driving signal of the touch electrode, coupling the displayed noise to the touch electrode, causing the touch function to fail.

[0038] For example, Figure 1 As shown, a flexible AMOLED (Active-matrix organic light-emitting diode) touch display screen manufactured by the Oncell process includes a touch electrode, a demux switch, a thin film encapsulation layer and a cathode layer. The touch electrode includes a touch drive electrode TX and a touch sensing electrode RX. The demux switch includes a mux1 switch and a mux2 switch. C1 is the parasitic capacitance between the touch electrode and the cathode layer, and C2 is the parasitic capacitance generated between the cathode and the data signal line. Since the TP electrode is directly manufactured on the upper surface of the thin film encapsulation layer (TFE) of the flexible AMOLED, and since the thickness of TFE is relatively thin, usually about 10um; therefore, the power signal in the cathode layer is likely to interfere with the touch drive signal of the touch electrode, coupling the displayed noise to the touch electrode, affecting the touch function.

[0039] Based on the above reasons, the inventors have found that by obtaining the shielding interval corresponding to the display line synchronization signal and adjusting the duty cycle of the touch driving signal according to the shielding interval, the target period of the touch driving signal can be located outside the effective period of the shielding interval, thereby reducing the interference of the charging and discharging processes of the touch driving signal, improving the signal-to-noise ratio of the touch driving signal, and thus ensuring the stability of the touch function.

[0040] The present application provides a touch control driver chip 100, such as Figure 2 and Figure 3 As shown, the touch driver chip 100 is used to obtain a shielding interval corresponding to a display row synchronization signal in an asynchronous mode, and adjust the duty cycle of the touch driver signal according to the shielding interval so that a target time period of the touch driver signal is outside an effective time period of the shielding interval; wherein, when the target time period of the touch driver signal is within the effective time period of the shielding interval, the touch driver signal is interfered by noise, and the target time period includes at least one of a charging time period and a discharging time period.

[0041] Among them, Figure 2 As shown, the touch driver chip 100 can be connected to the touch electrodes, which can include multiple touch driver electrodes TX and multiple touch sensing electrodes RX. The touch driver chip 100 provides touch driver signals to the touch driver electrodes TX and performs touch detection based on the signals fed back by the touch electrodes.

[0042] like Figure 4 As shown, the traditional touch driving method includes two modes: synchronous and asynchronous. Figure 4 In the sync mode, ELVSS is the cathode power supply signal, Hsync is the display line synchronization signal, Gate is the scanning signal provided to the transistor gate, and Source is the data signal. In the synchronous mode, the driving timing of the touch drive signal is synchronized with the line synchronization signal Hsync; by using the Hysnc signal as a reference, the driving timing phase of the touch drive signal can avoid the maximum noise interval of the display, thereby effectively avoiding the mutual interference between the display signal and the touch drive signal; however, in this mode, the frequency of the driving waveform of the touch drive signal will be limited, and it is usually required to be consistent with the Hsync signal frequency of the display or the harmonic frequency of the Hsync signal; therefore, it is not conducive to the tx drive to avoid the display noise of a specific frequency, resulting in a serious decrease in SNR.

[0043] In the asynchronous mode, since the driving waveform frequency of the touch driving signal is not limited by the Hsync signal frequency of the display, the selectable driving frequency is more flexible, which is more conducive to the touch driving signal driving avoiding display noise; however, usually in the asynchronous mode, it is unavoidable to encounter large display noise during touch sampling, which can easily cause the touch detection circuit to saturate and cause the SNR (Signal Noise Ratio) to be seriously reduced.

[0044] like Figure 5 As shown, Figure 5 A path diagram showing the introduction of noise in one embodiment of the present application is shown. Figure 5 In the embodiment, the Tx driving electrode inputs the touch driving signal; Cptx is the parasitic capacitance between the touch driving electrode TX and the cathode layer, Cprx is the parasitic capacitance between the touch sensing electrode RX and the cathode layer, and Cm is the mutual capacitance between the touch driving electrode Tx and the touch sensing electrode Rx. In the application, when the touch driving chip 100 collects the signal received by the touch sensing electrode Rx, it also receives the display noise, which causes the display noise to affect the touch detection.

[0045] It can be understood that the touch driving method adopted in the present application is an asynchronous mode, and in the asynchronous mode, the power supply signal in the cathode layer is likely to interfere with the touch driving signal of the touch electrode, coupling the displayed noise to the touch electrode, and affecting the touch function. In this embodiment, by obtaining the shielding interval corresponding to the display line synchronization signal, the noise interference interval can be determined, and the duty cycle of the touch driving signal can be adjusted according to the display noise interval, so that the jump period of the touch driving signal is located outside the period corresponding to the display noise interval, which can reduce the interference of the charging and discharging processes of the touch driving signal. In this way, while ensuring that the sampling integrity frequency remains unchanged, the touch sampling is avoided as much as possible from being affected by the display noise, the signal-to-noise ratio of the touch driving signal is improved, and the stability of the touch function is ensured.

[0046] It should be noted that the shielding interval can be determined by detecting the noise interference of the touch driving signal and obtaining the effective period and ineffective period of the display line synchronization signal. For example, the shielding interval can be the display noise interval (corresponding to Figure 3 The first shielding interval in the touch drive signal can be obtained by performing noise detection on the touch drive signal. For another example, the shielding interval can be a data signal update interval (corresponding to Figure 3 The second shielding interval in the display line synchronization signal is the second shielding interval in the display line synchronization signal, that is, a new frame of data writing time period. Since the data signal Data jumps (becomes larger or smaller) during the valid period of the line synchronization signal Hsync, and the data signal Data remains stable during the invalid period of the line synchronization signal Hsync, the data signal update interval can be determined based on the valid period and invalid period of the display line synchronization signal.

[0047] In applications, the effective period of the shielding interval may be the first level maintenance period. The charging period of the touch driving signal may be the period when the second level jumps to the first level, corresponding to the rising edge of the touch driving signal; the discharging period of the touch driving signal may be the period when the first level jumps to the second level, corresponding to the falling edge of the touch driving signal. It should be noted that the first level may be a high level, and the second level may be a low level.

[0048] The above touch driving chip 100 realizes touch detection and touch function by providing touch driving signals to touch driving electrodes. By obtaining the shielding interval corresponding to the display line synchronization signal and adjusting the duty cycle of the touch driving signal according to the shielding interval, the target period of the touch driving signal can be located outside the effective period of the shielding interval, thereby reducing the interference of the charging and discharging processes of the touch driving signal, improving the signal-to-noise ratio of the touch driving signal, and ensuring the stability of the touch function.

[0049] In one embodiment, Figure 3As shown, the shielding interval includes at least one of a display noise interval and a display data update interval, wherein for different types of shielding intervals, the target time period types of the touch driving signal outside the effective time period close to the shielding interval are different.

[0050] The display noise interval is the interval where the display signal has a relatively large interference with the touch driving signal, which can be obtained by detecting the touch driving signal through the touch driving chip 100. The display data update interval is the time period for writing a new frame of data, that is, when the screen is updated.

[0051] It can be understood that for different types of shielding intervals, the target time period types of the touch driving signal outside the effective time period close to the shielding interval are different, that is, the target time period close to the display noise interval is different from the target time period close to the display data update interval.

[0052] For a touch driving signal using an asynchronous scanning method, the discharge period of the touch driving signal often falls within the effective period of the data update interval, and the charging period of the touch driving signal often falls within the effective period of the display noise interval. Therefore, the duty cycle of the touch driving signal is adjusted according to the data update interval and the display noise interval in order to move the discharge period of the touch driving signal out of the effective period of the data update interval, and move the charging period of the touch driving signal out of the effective period of the display noise interval. After adjusting the duty cycle, Figure 3 As shown, the target period close to the display noise interval is the charging period, and the target period close to the data update interval is the discharging period, so that the charging period of the touch drive signal does not fall into the effective period of the display noise interval, and the discharging period does not fall into the effective period of the data update interval, reducing the interference of the display noise and the data signal on the charging and discharging processes of the touch drive signal, improving the signal-to-noise ratio of the touch drive signal, thereby ensuring the stability of the touch function. In addition, it also avoids the problem of the touch drive signal crosstalking to the power signal of the cathode layer through the parasitic capacitance, and then coupling to the data signal through the power signal of the cathode layer, causing display abnormality.

[0053] In one embodiment, Figure 3 As shown, when the shielding interval is the display noise interval, the touch driving chip 100 is used to adjust the duty cycle of the touch driving signal so that the discharge period of the touch driving signal is outside the effective period of the display noise interval, and the effective period of the touch driving signal after adjustment does not intersect with the effective period of the display noise interval.

[0054] It can be understood that for a touch drive signal using an asynchronous scanning method, in the same row scanning cycle, the charging period of the touch drive signal often falls within the effective period of the display noise interval, while the discharging period of the touch drive signal often falls outside the effective period of the display noise interval. Therefore, after adjusting the duty cycle of the touch drive signal, the charging period and the discharging period of the touch drive signal can be both outside the effective period of the display noise interval, and the effective period of the touch drive signal and the effective period of the display noise interval in the row scanning cycle do not overlap, thereby reducing the interference of the display noise on the touch drive signal and ensuring the stability of the touch function. It should be noted that the effective period of the touch drive signal can also be the first level maintenance period.

[0055] In one embodiment, Figure 3 As shown, when the shielding interval is the display data update interval, the touch driver chip 100 is used to adjust the duty cycle of the touch driver signal so that the charging period of the touch driver signal is outside the effective period of the display data update interval, and the effective period of the touch driver signal after adjustment does not intersect with the effective period of the display data update interval.

[0056] In applications, parasitic capacitance is generated between the cathode electrode and the data signal line. When the data signals in multiple data signal lines jump as a whole, the cathode electrode voltage will fluctuate and couple to the touch layer, thus generating noise that interferes with the touch sensing effect. The greater the amplitude of the data signal in the adjacent data signal lines, the stronger the interference to the touch sensing effect.

[0057] It can be understood that for a touch drive signal using an asynchronous scanning method, in the same row scanning cycle, the discharge period of the touch drive signal often falls within the effective period of the data update interval, while the charging period of the touch drive signal often falls outside the effective period of the data update interval. Therefore, after adjusting the duty cycle of the touch drive signal, the charging period and the discharge period of the touch drive signal can be located outside the effective period of the display noise interval, and the effective period of the touch drive signal and the effective period of the data update interval in the row scanning cycle do not overlap, so that the touch drive signal and the data signal do not interfere with each other, ensuring the stability of the touch function and the display effect. It should be noted that the effective period of the touch drive signal can also be the first level maintenance period.

[0058] In one embodiment, the touch driving chip 100 is further used to detect the time domain position information and noise value of the display noise in the row scanning period according to the touch driving signal, and obtain the display noise interval according to the time domain position information and the noise value.

[0059] The touch driving chip 100 can detect the interference of the touch driving signal, and can determine the time domain position information and noise value of the display noise according to the interference of the touch driving signal, and then determine the time domain position information and noise value of the display noise in the line scanning cycle in combination with the line synchronization signal. The time domain position with the largest noise value can be used as the reference time domain position, and then the display noise interval is constructed with the reference time domain position as the center time point, and the time period corresponding to the display noise interval can be predetermined.

[0060] It can be understood that the touch driver chip 100 can dynamically determine the display noise range during the operation of the display panel in the above manner, and then adjust the analog front-end settings inside the touch driver chip 100 based on the display noise range through the internal register, and adaptively adjust the duty cycle of the touch driver signal without changing the current touch driver signal scanning frequency, so that the target time period of the touch driver signal is located in the time period corresponding to the display noise range, and the rising edge and falling edge of the touch driver signal avoid the display noise range, thereby improving the signal-to-noise ratio of the touch driver signal, reducing the interference on the touch driver signal, and ensuring the stability of the touch function.

[0061] In one embodiment, during the process of adjusting the duty cycle of the touch driving signal according to the shielding interval, the frequency or period of the touch driving signal is kept unchanged.

[0062] It can be understood that by keeping the frequency or period of the touch driving signal unchanged during the process of changing the duty cycle of the touch driving signal, the main frequency point of the touch driving signal scan will not be affected, thereby ensuring the accuracy of the touch recognition process.

[0063] In one embodiment, Figure 6 As shown, the maximum width of the shielding interval is the shielding width, Tx Clock is the touch driving signal cycle width. The width of the shielding interval is greater than 0 and is less than or equal to half of the touch driving signal cycle width.

[0064] It is understandable that if the width of the shielding interval is too large, it may result in that the target period of the touch driving signal cannot be located outside the period corresponding to the display noise interval by adjusting the duty cycle of the touch driving signal. In the case where the width of the shielding interval is greater than 0 and less than or equal to half of the width of the touch driving signal cycle, the duty cycle of the touch driving signal can be adjusted to make the target period of the touch driving signal outside the effective period of the shielding interval, thereby improving the signal-to-noise ratio of the touch driving signal, reducing the interference to the touch driving signal, and ensuring the stability of the touch function.

[0065] In one embodiment, the touch driver chip 100 is also used to adjust the duty cycle of the touch driver signal according to the shielding width when it is detected that the target time period of the touch driver signal is within the effective time period of the shielding interval, so that the target time period of the touch driver signal is outside the effective time period of the shielding interval, wherein the shielding width is the maximum width of the shielding interval.

[0066] In application, it can be understood that after the touch driver chip 100 obtains the shielding interval, it can detect whether the target time period of the touch driver signal is within the effective time period of the shielding interval, and then determine whether the target time period of the driver signal is within the effective time period of the shielding interval during the operation of the display panel. In the case where it is determined that the target time period of the touch driver signal is within the effective time period of the shielding interval, by adjusting the duty cycle of the touch driver signal, the target time period of the touch driver signal can be located outside the effective time period of the shielding interval, so that the rising edge and falling edge of the touch driver signal avoid the shielding interval, thereby improving the signal-to-noise ratio of the touch driver signal, reducing the interference to the touch driver signal, ensuring the stability of the touch function, and reducing the interference of the touch driver signal to the data signal, thereby improving the display effect. In the case where the target time period of the touch driver signal is outside the effective time period of the shielding interval, there is no need to adjust the duty cycle of the touch driver signal.

[0067] Based on the same inventive concept, in one embodiment, Figure 7 As shown, the present application also provides a touch display panel, including: touch electrodes, a data driving component 200 and a touch driving chip 100 as described in the above embodiment, wherein the touch electrodes include touch driving electrodes and touch sensing electrodes.

[0068] Among them, taking mutual capacitance technology as an example, the touch electrode can include multiple touch drive electrodes TX and multiple touch sensing electrodes RX. The touch drive chip 100 provides a touch drive signal to the touch drive electrode TX and can measure the charge received on the touch sensing electrode RX pin. The touch drive electrode TX and the touch sensing electrode RX form a mutual capacitance at the intersection. The charge received on the touch sensing electrode RX is proportional to the mutual capacitance between the two electrodes. When a finger touches the display screen, it affects the coupling between the two electrodes near the touch point, thereby changing the capacitance between the two electrodes. According to the charge received on the touch sensing electrode RX, the two-dimensional capacitance change data of the touch display panel can be obtained, and the coordinates of each touch point can be calculated, and then a response can be made according to the coordinates of the touch point.

[0069] The data driving component 200 is used to generate a data signal in response to a line synchronization signal. The data signal includes a transition period and a sustain period. The transition period of the data signal corresponds to the valid period of the line synchronization signal, and the sustain period of the data signal corresponds to the invalid period of the line synchronization signal.

[0070] In applications, during the effective period of the display line synchronization signal Hsync, the data signal Data changes (increases or decreases), and during the ineffective period of the display line synchronization signal Hsync, the data signal Data remains stable. Figure 4 In the display, the effective period of the display line synchronization signal Hsync is a high level, the transition period of the data signal Data is a rising edge or a falling edge of the data signal Data, and the maintenance period of the data signal Data is when the data signal Data maintains a stable high level or a low level.

[0071] In asynchronous mode, parasitic capacitance will be generated between the cathode electrode and the data signal line. When a new frame of data is written, that is, when the screen is updated, the data signal will jump. When the data signals in multiple data signal lines jump as a whole, the cathode electrode voltage will fluctuate and couple to the touch electrode, generating noise that interferes with the touch sensing effect. The greater the amplitude of the data signal in the adjacent data signal line, the stronger the interference to the touch sensing effect. In addition, the drive signal will also be crosstalked to ELVSS through the parasitic capacitance, and then coupled to the displayed data signal through ELVSS, causing the data signal to fluctuate greatly, resulting in display abnormalities.

[0072] It can be understood that the touch driver chip 100 adjusts the duty cycle of the touch driver signal according to the data signal update interval, so that the jump period of the touch driver signal is located outside the effective period of the data signal update interval, and the charging period and the discharging period of the touch driver signal are located outside the high level maintenance period of the data signal and the effective period of the display line synchronization signal Hsync. In this way, the data signal and the line synchronization signal will not be crosstalked during the jump period due to the charging and discharging of the touch driver signal. Therefore, when the touch display panel is working, the charging of the touch electrode will not cause crosstalk to the data line to form interference horizontal stripes and the like, and at the same time, it can also avoid the interference of the touch driver signal jump on the data signal, thereby ensuring the stability of the touch function.

[0073] The above touch display panel includes touch electrodes, a data driving component 200 and a touch driving chip 100 as in the above embodiment. The touch driving chip 100 is connected to the touch driving electrode, and touch detection is realized by providing a touch driving signal to the touch driving electrode to realize the touch function. The touch driving chip 100 obtains the shielding interval corresponding to the display line synchronization signal, and adjusts the duty cycle of the touch driving signal according to the shielding interval, so that the target time period of the touch driving signal is located outside the effective time period of the shielding interval, reducing the interference of the charging process and the discharging process of the touch driving signal, improving the signal-to-noise ratio of the touch driving signal, ensuring the stability of the touch function, and at the same time, reducing the interference of the touch driving signal on the data signal, and improving the display effect of the touch display panel.

[0074] In one embodiment, the touch display panel further includes a display driver chip, and the data driver component 200 is integrated into the display driver chip.

[0075] In one embodiment, the touch display panel further includes: a base substrate, a cathode layer and a thin film encapsulation layer.

[0076] The cathode layer is located on one side of the substrate, and the cathode layer includes a cathode. The thin film encapsulation layer is located on the side of the cathode layer away from the substrate. The touch electrode is located on the surface of the thin film encapsulation layer away from the substrate.

[0077] It can be understood that the touch driver chip 100 of the present application can obtain the shielding interval corresponding to the display line synchronization signal, and adjust the duty cycle of the touch driver signal according to the shielding interval, so that the target period of the touch driver signal is located outside the effective period of the shielding interval, reducing the interference of the charging and discharging processes of the touch driver signal, improving the signal-to-noise ratio of the touch driver signal, ensuring the stability of the touch function, and at the same time, reducing the interference of the touch driver signal on the data signal, and improving the display effect of the touch display panel. Therefore, on this basis, the distance between the cathode layer and the touch electrode can be closer, and the touch electrode can be set on the surface of the thin film encapsulation layer away from the substrate, so that the cathode layer and the touch electrode are only separated by the thin film encapsulation layer.

[0078] Based on the same inventive concept, an embodiment of the present application further provides a display device (not shown), which includes the display panel in the above embodiment.

[0079] It can be understood that the display device in the embodiments of the present application can be an OLED display device, a QLED display device, electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a wearable device, an Internet of Things device, or any other product or component with a display function, and the embodiments disclosed in the present application are not limited to this.

[0080] In one embodiment, Figure 8 The present application further provides a method for driving a touch display panel, and the method includes the following steps S801 and S802.

[0081] S801: In the asynchronous mode, obtaining a masking interval corresponding to a display line synchronization signal.

[0082] Among them, the shielding interval can be determined by detecting the noise interference of the touch drive signal and obtaining the effective period and ineffective period of the display line synchronization signal. For example, the shielding interval can be a display noise interval, which can be obtained by performing noise detection on the touch drive signal. For another example, the shielding interval can be a data signal update interval, that is, a new frame of data writing time period. Since the data signal jumps (becomes larger or smaller) during the effective period of the line synchronization signal Hsync, and the data signal remains stable during the ineffective period of the line synchronization signal Hsync, the data signal update interval can be determined based on the effective period and ineffective period of the display line synchronization signal.

[0083] S802: Adjusting the duty cycle of the touch drive signal according to the shielding interval so that a target time period of the touch drive signal is outside the effective time period of the shielding interval; wherein, when the target time period of the touch drive signal is within the effective time period of the shielding interval, the touch drive signal is interfered by noise, and the target time period includes at least one of a charging time period and a discharging time period.

[0084] In applications, the effective period of the shielding interval may be the first level maintenance period. The charging period of the touch driving signal may be the period when the second level jumps to the first level, corresponding to the rising edge of the touch driving signal; the discharging period of the touch driving signal may be the period when the first level jumps to the second level, corresponding to the falling edge of the touch driving signal. It should be noted that the first level may be a high level, and the second level may be a low level.

[0085] In the asynchronous mode, since the driving waveform frequency of the touch driving signal is not limited by the Hsync signal frequency of the display, the selectable driving frequency is more flexible, which is more conducive to the touch driving signal driving to avoid display noise; however, usually in the asynchronous mode, it is unavoidable to encounter large display noise during touch sampling, which can easily cause the touch detection circuit to saturate and cause a serious decrease in SNR.

[0086] It can be understood that the touch driving method adopted in the present application is an asynchronous mode, and in the asynchronous mode, the power supply signal in the cathode layer is likely to interfere with the touch driving signal of the touch electrode, coupling the displayed noise to the touch electrode, and affecting the touch function. In this embodiment, by obtaining the shielding interval corresponding to the display line synchronization signal, the noise interference interval can be determined, and the duty cycle of the touch driving signal can be adjusted according to the display noise interval, so that the jump period of the touch driving signal is located outside the period corresponding to the display noise interval, which can reduce the interference of the charging and discharging processes of the touch driving signal. In this way, while ensuring that the sampling integrity frequency remains unchanged, the touch sampling is avoided as much as possible from being affected by the display noise, the signal-to-noise ratio of the touch driving signal is improved, and the stability of the touch function is ensured.

[0087] The driving method of the above-mentioned display panel obtains the shielding interval corresponding to the display line synchronization signal in the asynchronous mode, and adjusts the duty cycle of the touch driving signal according to the shielding interval, so that the target time period of the touch driving signal is outside the effective time period of the shielding interval, thereby reducing the interference of the charging and discharging processes of the touch driving signal, improving the signal-to-noise ratio of the touch driving signal, and thus ensuring the stability of the touch function.

[0088] In one embodiment, the driving method further includes: when the shielding interval is a display noise interval, adjusting the duty cycle of the touch driving signal so that the discharge period of the touch driving signal is outside the effective period of the display noise interval, and the effective period of the touch driving signal after adjustment does not intersect with the effective period of the display noise interval.

[0089] It can be understood that for a touch drive signal using an asynchronous scanning method, in the same row scanning cycle, the charging period of the touch drive signal often falls within the effective period of the display noise interval, while the discharging period of the touch drive signal often falls outside the effective period of the display noise interval. Therefore, after adjusting the duty cycle of the touch drive signal, the charging period and the discharging period of the touch drive signal can be both outside the effective period of the display noise interval, and the effective period of the touch drive signal and the effective period of the display noise interval in the row scanning cycle do not overlap, thereby reducing the interference of the display noise on the touch drive signal and ensuring the stability of the touch function. It should be noted that the effective period of the touch drive signal can also be the first level maintenance period.

[0090] In one embodiment, the driving method further includes: detecting the time domain position information and the noise value of the display noise in the row scanning period according to the touch driving signal; and acquiring the display noise interval according to the time domain position information and the noise value.

[0091] It can be understood that the display noise range can be dynamically determined in the operation process of the display panel through the above method, and then based on the display noise range, the analog front-end settings inside the touch driver chip are adjusted through the internal register. Without changing the current touch drive signal scanning frequency, the duty cycle of the touch drive signal is adaptively adjusted so that the target time period of the touch drive signal is located in the time period corresponding to the display noise range, and the rising edge and falling edge of the touch drive signal avoid the display noise range, thereby improving the signal-to-noise ratio of the touch drive signal, reducing the interference on the touch drive signal, and ensuring the stability of the touch function.

[0092] In one embodiment, the driving method further includes: when the shielding interval is a display data update interval, adjusting the duty cycle of the touch driving signal so that the charging period of the touch driving signal is outside the effective period of the display data update interval, and the effective period of the touch driving signal after adjustment does not intersect with the effective period of the display data update interval.

[0093] In applications, parasitic capacitance is generated between the cathode electrode and the data signal line. When the data signals in multiple data signal lines jump as a whole, the cathode electrode voltage will fluctuate and couple to the touch layer, thus generating noise that interferes with the touch sensing effect. The greater the amplitude of the data signal in the adjacent data signal lines, the stronger the interference to the touch sensing effect.

[0094] It can be understood that for a touch drive signal using an asynchronous scanning method, in the same row scanning cycle, the discharge period of the touch drive signal often falls within the effective period of the data update interval, while the charging period of the touch drive signal often falls outside the effective period of the data update interval. Therefore, after adjusting the duty cycle of the touch drive signal, the charging period and the discharge period of the touch drive signal can be located outside the effective period of the display noise interval, and the effective period of the touch drive signal and the effective period of the data update interval in the row scanning cycle do not overlap, so that the touch drive signal and the data signal do not interfere with each other, ensuring the stability of the touch function and the display effect. It should be noted that the effective period of the touch drive signal can also be the first level maintenance period.

[0095] In one embodiment, the driving method further includes: when it is detected that the target period of the touch driving signal is within the effective period of the shielding interval, adjusting the duty cycle of the touch driving signal according to the shielding width so that the target period of the touch driving signal is outside the effective period of the shielding interval. The shielding width is the maximum width of the shielding interval.

[0096] In the application, it can be understood that after obtaining the shielding interval, it is possible to detect whether the target time period of the touch drive signal is within the effective time period of the shielding interval, and then determine whether the target time period of the drive signal is within the effective time period of the shielding interval during the operation of the display panel. In the case where it is determined that the target time period of the touch drive signal is within the effective time period of the shielding interval, the duty cycle of the touch drive signal is adjusted according to the shielding width, so that the target time period of the touch drive signal is outside the effective time period of the shielding interval, and the rising and falling edges of the touch drive signal avoid the shielding interval, thereby improving the signal-to-noise ratio of the touch drive signal, reducing the interference to the touch drive signal, ensuring the stability of the touch function, and reducing the interference of the touch drive signal to the data signal, thereby improving the display effect. In the case where the target time period of the touch drive signal is outside the effective time period of the shielding interval, there is no need to adjust the duty cycle of the touch drive signal.

[0097] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the accompanying drawings may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0098] In one embodiment, the present application provides a touch display panel, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the touch display panel driving method described in any of the above embodiments are implemented.

[0099] In the embodiment of the present application, the processor may include one or more processing cores. The processor uses various interfaces and lines to connect various parts in the entire terminal, and executes various functions of the terminal 80 and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory, and calling data stored in the memory.

[0100] The above-mentioned touch display panel is a display component for displaying images, and is usually arranged on the front panel of the terminal. The touch display panel can be designed as a full screen, a curved screen, a special-shaped screen, a double-sided screen or a folding screen. The display panel can also be designed as a combination of a full screen and a curved screen, or a combination of a special-shaped screen and a curved screen, which is not limited in this embodiment.

[0101] In the embodiment of the present application, the touch display panel may include a display driver chip, a display screen and a touch driver chip. Optionally, the display screen may be an OLED display screen, which may be a low temperature polycrystalline silicon (LTPS) AMOLED display screen or a low temperature polycrystalline oxide (LTPO) AMOLED display screen. The display driver chip is used to drive the display screen to display images.

[0102] The touch driver chip is used to receive a touch operation, which is triggered by a user using a finger, a touch pen, or any other suitable object. In the embodiment of the present application, the touch driver chip is also electrically connected to the display driver chip to receive a horizontal synchronization signal sent by the display driver chip to implement the touch driver method in each of the above embodiments.

[0103] In one embodiment, a computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for driving a touch display panel as described in any of the above embodiments are implemented.

[0104] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0105] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0106] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the driving method of the touch display panel. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0107] In the embodiments provided in the present application, it should be understood that the disclosed device / user terminal and method can be implemented in other ways. For example, the device / user terminal embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0108] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software functional units.

[0109] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0110] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0111] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0112] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A touch control driver chip, characterized in that: The touch driving chip is used to obtain a shielding interval corresponding to a display row synchronization signal in an asynchronous mode, and adjust the duty cycle of the touch driving signal according to the shielding interval so that a target time period of the touch driving signal is outside an effective time period of the shielding interval; wherein, when the target time period of the touch driving signal is within the effective time period of the shielding interval, the touch driving signal is interfered by noise, and the target time period includes at least one of a charging time period and a discharging time period.

2. The touch control driver chip according to claim 1, characterized in that: The shielding interval includes at least one of a display noise interval and a display data update interval, wherein for different types of shielding intervals, the target time period of the touch driving signal outside the effective time period close to the shielding interval has different types.

3. The touch control driver chip according to claim 2, characterized in that: When the shielding interval is the display noise interval, the touch driving chip is used to adjust the duty cycle of the touch driving signal so that the discharge period of the touch driving signal is outside the effective period of the display noise interval, and the effective period of the touch driving signal after adjustment does not intersect with the effective period of the display noise interval.

4. The touch control driver chip according to claim 2, characterized in that: When the shielding interval is the display data update interval, the touch driving chip is used to adjust the duty cycle of the touch driving signal so that the charging period of the touch driving signal is outside the effective period of the display data update interval, and the effective period of the touch driving signal after adjustment does not intersect with the effective period of the display data update interval.

5. The touch control driver chip according to claim 2, characterized in that: The touch driving chip is further used to detect the time domain position information and the noise value of the display noise in the row scanning period according to the touch driving signal, and obtain the display noise interval according to the time domain position information and the noise value.

6. The touch control driver chip according to claim 1, characterized in that: In the process of adjusting the duty cycle of the touch driving signal according to the shielding interval, the frequency or period of the touch driving signal is kept unchanged.

7. The touch control driver chip according to any one of claims 1 to 6, characterized in that: The width of the shielding interval is greater than 0 and is less than or equal to half of the width of the touch driving signal cycle.

8. The touch control driver chip according to claim 1, characterized in that: The touch driving chip is also used to adjust the duty cycle of the touch driving signal according to the shielding width when it is detected that the target time period of the touch driving signal is within the effective time period of the shielding interval, so that the target time period of the touch driving signal is outside the effective time period of the shielding interval, wherein the shielding width is the maximum width of the shielding interval.

9. A touch display panel, characterized in that: include: A touch electrode, a data driving component and a touch driving chip according to any one of claims 1 to 8, wherein the touch electrode comprises a touch driving electrode and a touch sensing electrode; The data driving component is used to generate a data signal in response to a row synchronization signal, and the data signal includes a jump period and a maintenance period; wherein the jump period of the data signal corresponds to the valid period of the row synchronization signal, and the maintenance period of the data signal corresponds to the invalid period of the row synchronization signal.

10. The touch display panel according to claim 9, characterized in that: The touch display panel also includes: substrate substrate; A cathode layer, located on one side of the substrate, the cathode layer comprising a cathode; A thin film encapsulation layer, located on a side of the cathode layer away from the substrate; Wherein, the touch electrode is located on a surface of the thin film encapsulation layer away from the base substrate.

11. A method for driving a touch display panel, characterized in that: The driving method comprises: In the asynchronous mode, obtaining the shielding interval corresponding to the display line synchronization signal; The duty cycle of the touch drive signal is adjusted according to the shielding interval so that a target time period of the touch drive signal is outside an effective time period of the shielding interval; wherein, when the target time period of the touch drive signal is within the effective time period of the shielding interval, the touch drive signal is interfered by noise, and the target time period includes at least one of a charging time period and a discharging time period.

12. The method for driving a touch display panel according to claim 11, characterized in that: The driving method further includes: When the shielding interval is a display noise interval, the duty cycle of the touch driving signal is adjusted so that a discharge period of the touch driving signal is outside an effective period of the display noise interval, and the effective period of the touch driving signal after adjustment does not intersect with the effective period of the display noise interval.

13. The method for driving a touch display panel according to claim 12, wherein: The driving method further includes: Detecting the time domain position information and the noise value of the display noise in the row scanning period according to the touch driving signal; The display noise interval is acquired according to the time domain position information and the noise value.

14. The method for driving a touch display panel according to claim 11, characterized in that: The driving method further includes: When the shielding interval is a display data update interval, the duty cycle of the touch driving signal is adjusted so that a charging period of the touch driving signal is outside an effective period of the display data update interval, and the effective period of the touch driving signal after adjustment does not intersect with the effective period of the display data update interval.

15. The method for driving a touch display panel according to claim 11, characterized in that: The driving method further includes: When it is detected that the target time period of the touch drive signal is within the effective time period of the shielding interval, the duty cycle of the touch drive signal is adjusted according to the shielding width so that the target time period of the touch drive signal is outside the effective time period of the shielding interval, wherein the shielding width is the maximum width of the shielding interval.

16. A touch display panel, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 11 to 15 are implemented.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 11 to 15 are implemented.

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