Touch screen foreign matter detection method and system, display device and electronic device

Abstract

This disclosure relates to a method, system, display device, and electronic device for detecting foreign objects on a touchscreen. The touchscreen is configured with a sensor array consisting of multiple first electrodes and multiple second electrodes. The method includes: grouping the multiple second electrodes to determine at least one second electrode group; configuring the current state of each first electrode to be grounded, and configuring the current state of each second electrode in the at least one second electrode group to be one of grounded, driven, or received, forming a first mutual capacitance sensor array; ensuring that at least three second electrodes in the same second electrode group have different current states; scanning the first mutual capacitance sensor array to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group; and determining a first foreign object detection result based on the touch detection data corresponding to each second electrode group. In the embodiments of this disclosure, high-sensitivity foreign object detection is achieved by dynamically reconstructing the state of the electrodes in the sensor array.

Description

Technical Field

[0001] This disclosure relates to the field of touch technology, and in particular to a method, system, display device, and electronic device for detecting foreign objects on a touch screen. Background Technology

[0002] With the rapid development of display technology, flexible organic light-emitting diode (OLED) screens, due to their unique bendable and foldable characteristics, have been widely used in high-end electronic devices such as foldable phones, tablets, and laptops. However, this technology has also brought unprecedented challenges: during repeated opening and closing of electronic devices, the folding area of ​​the flexible OLED screen is extremely prone to being trapped by tiny foreign objects (such as dust, sand, or paper scraps) or being squeezed by other objects (such as data cables) without the user's knowledge. This can cause the flexible OLED screen to be subjected to enormous stress in certain areas, resulting in irreversible indentations, bright spots, or even permanent damage.

[0003] Flexible OLED screen modules have a sophisticated and expensive structure, and their repair or replacement costs are extremely high, significantly impacting user experience and imposing a heavy economic burden. Therefore, detecting foreign objects on flexible OLED screens before damage occurs has become a crucial and urgent technical problem to be solved in this field. Summary of the Invention

[0004] In view of this, this disclosure proposes a method, system, display device, and electronic device for detecting foreign objects on a touch screen.

[0005] According to one aspect of this disclosure, a method for detecting foreign objects on a touchscreen is provided. The touchscreen is configured with a sensing array consisting of a plurality of first electrodes and a plurality of second electrodes, each first electrode and each second electrode being electrically connected to a touch chip. The method includes:

[0006] The plurality of second electrodes are grouped to determine at least one group of second electrodes;

[0007] The current state of each of the plurality of first electrodes is configured to be grounded, and the current state of each of the at least one second electrode group is configured to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states.

[0008] The first mutual capacitance sensor array is scanned to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group.

[0009] Based on the touch detection data corresponding to each of the second electrode groups, the first foreign object detection result is determined.

[0010] In one possible implementation, the second electrodes in the same second electrode group are arranged consecutively.

[0011] In one possible implementation, the number of second electrodes in each of the second electrode groups is the same.

[0012] In one possible implementation, the current state of the second electrodes corresponding to the same position in different second electrode groups is the same.

[0013] In one possible implementation, at least one second electrode in the first mutual capacitance sensing array, which is currently in a receiving state, is included between the second electrode in the first mutual capacitance sensing array and the second electrode in the first mutual capacitance sensing array, which is currently in a driving state.

[0014] In one possible implementation, the method further includes:

[0015] The plurality of first electrodes are grouped to determine at least one first electrode group;

[0016] The current state of each of the plurality of second electrodes is configured to be grounded, and the current state of each of the at least one first electrode group is configured to be grounded, driven, or received, to form a second mutual capacitance sensing array; wherein, at least three first electrodes in the same first electrode group have different current states.

[0017] The second mutual capacitance sensor array is scanned to obtain touch detection data corresponding to each first electrode group in the at least one first electrode group;

[0018] The determination of the first foreign object detection result based on the touch detection data corresponding to each of the second electrode groups includes:

[0019] The first foreign object detection result is determined based on the touch detection data corresponding to each of the second electrode groups and the touch detection data corresponding to each of the first electrode groups.

[0020] In one possible implementation, the method further includes: configuring the current state of each of the plurality of second electrodes to a self-capacitive state to form a first self-capacitive sensing array; and scanning the first self-capacitive sensing array to obtain touch detection data corresponding to each of the second electrodes; and / or configuring the current state of each of the plurality of first electrodes to a self-capacitive state to form a second self-capacitive sensing array; and scanning the second self-capacitive sensing array to obtain touch detection data corresponding to each of the first electrodes.

[0021] The second foreign object detection result is determined based on the touch detection data corresponding to each of the second electrodes and / or the touch detection data corresponding to each of the first electrodes.

[0022] According to another aspect of this disclosure, a foreign object detection device for a touch screen is provided. The touch screen is configured with a sensing array consisting of a plurality of first electrodes and a plurality of second electrodes, each first electrode and each second electrode being electrically connected to a touch chip. The device includes:

[0023] The first module groups the plurality of second electrodes to determine at least one group of second electrodes.

[0024] The second module configures the current state of each of the plurality of first electrodes to be grounded, and configures the current state of each of the at least one second electrode group to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states.

[0025] The third module is used to scan the first mutual capacitance sensor array to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group.

[0026] The fourth module is used to determine the first foreign object detection result based on the touch detection data corresponding to each of the second electrode groups.

[0027] According to another aspect of this disclosure, a foreign object detection system for a touch screen is provided. The touch screen foreign object detection system includes a touch screen and a touch chip. The touch screen is configured with a sensing array consisting of a plurality of first electrodes and a plurality of second electrodes. Each first electrode and each second electrode are electrically connected to the touch chip. The touch chip is used for:

[0028] The plurality of second electrodes are grouped to determine at least one group of second electrodes;

[0029] The current state of each of the plurality of first electrodes is configured to be grounded, and the current state of each of the at least one second electrode group is configured to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states.

[0030] The first mutual capacitance sensor array is scanned to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group.

[0031] Based on the touch detection data corresponding to each of the second electrode groups, the first foreign object detection result is determined.

[0032] According to another aspect of this disclosure, a display device is provided, including the aforementioned touchscreen foreign object detection system.

[0033] In one possible implementation, the touchscreen includes any one of a liquid crystal display panel, an organic light-emitting diode display panel, a quantum dot light-emitting diode display panel, a mini light-emitting diode display panel, and a micro light-emitting diode display panel.

[0034] According to another aspect of this disclosure, an electronic device is provided, including the aforementioned display device.

[0035] According to another aspect of this disclosure, a non-volatile computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the above-described method.

[0036] According to another aspect of this disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the above-described method.

[0037] In various aspects of this disclosure, for a touch screen configured with a sensor array consisting of multiple first electrodes and multiple second electrodes, the multiple second electrodes are grouped to determine at least one second electrode group; the current state of each of the multiple first electrodes is configured to be grounded, and the current state of each of the at least one second electrode group is configured to be grounded, driven, or received, forming a first mutual capacitive sensor array; wherein, at least three second electrodes in the same second electrode group have different current states; the first mutual capacitive sensor array is scanned to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group; based on the touch detection data corresponding to each second electrode group, a first foreign object detection result is determined. In this way, by grouping multiple second electrodes in the touchscreen and dynamically reconstructing the current state of the first and second electrodes, a novel mutual capacitance sensing array (i.e., the first mutual capacitance sensing array) is formed. Through this dynamic reconstruction method, the high sensitivity of the mutual capacitance mode can be utilized to accurately capture the capacitance changes of the touchscreen. Without increasing the additional hardware cost, high-precision detection of foreign objects on the touchscreen (especially foldable screens) can be achieved. This allows for timely and accurate detection of foreign objects on the touchscreen before damage occurs, and can then proactively issue an alarm to the user or trigger a protection mechanism, effectively avoiding the inconvenience and economic losses caused by touchscreen damage. This is especially effective for protecting flexible OLED screens, which have delicate structures and high costs.

[0038] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0039] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this disclosure together with the specification and serve to explain the principles of this disclosure.

[0040] Figure 1 A schematic diagram of a sensor array in a touch screen according to an embodiment of the present disclosure is shown.

[0041] Figure 2 A structural diagram of a control circuit in a touch chip according to an embodiment of the present disclosure is shown.

[0042] Figure 3 The diagram shows a waveform of the control circuit when the electrode is in a grounded state according to an embodiment of the present disclosure.

[0043] Figure 4 A waveform diagram of a control circuit is shown when the electrode is in a driving state according to an embodiment of the present disclosure.

[0044] Figure 5 Another waveform diagram of the control circuit is shown when the electrode is in a driving state according to an embodiment of the present disclosure.

[0045] Figure 6 The diagram shows a waveform of the control circuit when the electrode is in the receiving state according to an embodiment of the present disclosure.

[0046] Figure 7 The diagram shows a waveform of the control circuit when the electrode is in a self-capacitive state according to an embodiment of the present disclosure.

[0047] Figure 8 A schematic diagram of a detection circuit according to an embodiment of the present disclosure is shown.

[0048] Figure 9 The diagram shows a waveform corresponding to a matrix buffer circuit according to an embodiment of the present disclosure.

[0049] Figure 10 A flowchart is shown for a foreign object detection method for a touch screen according to an embodiment of the present disclosure.

[0050] Figure 11 A flowchart is shown for another method for detecting foreign objects on a touchscreen according to an embodiment of the present disclosure.

[0051] Figure 12 A flowchart is shown for another method for detecting foreign objects on a touchscreen according to an embodiment of the present disclosure.

[0052] Figure 13 This diagram illustrates a structural diagram of a foreign object detection device for a touchscreen according to an embodiment of the present disclosure.

[0053] Figure 14This diagram illustrates a structural diagram of a foreign object detection system for a touchscreen according to an embodiment of the present disclosure. Detailed Implementation

[0054] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0055] As used herein, the terms “comprising,” “including,” “having,” or variations thereof are open-ended and include one or more of the stated features, integrals, elements, steps, components, or functions, but do not exclude the presence or addition of one or more other features, integrals, elements, steps, components, functions, or groups thereof.

[0056] When an element is referred to as “connected,” “coupled,” “responding,” or a variation thereof relative to another element, it may be directly connected, coupled, or responding to another element, or there may be an intermediate element present.

[0057] Although the terms first, second, third, etc., may be used herein to describe various elements / operations, these elements / operations should not be limited by these terms. These terms are only used to distinguish one element / operation from another. Therefore, without departing from the teachings of the inventive concept, a first element / operation in some embodiments may be referred to as a second element / operation in other embodiments.

[0058] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0059] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0060] This disclosure addresses the technical problem of screen damage caused by foreign objects on touchscreens, particularly the damage to flexible OLED foldable screens caused by foreign objects (such as sand, paper, or metal) entering the folding area during the folding process. It provides a foreign object detection method for touchscreens that fully utilizes existing touch hardware resources of electronic devices. Through an intelligent and reconfigurable electrode configuration strategy, it achieves high-precision and high-sensitivity detection of foreign objects on touchscreens, especially in the folding area of ​​flexible screens, without increasing hardware costs; thus enabling proactive foreign object protection for touchscreens. In some examples, full-coverage detection can be achieved, meaning both common-site and non-common-site foreign objects can be detected.

[0061] This disclosure does not limit the specific type of the touch screen. For example, the touch screen may include any one of the following: LCD (Liquid Crystal Display) display panel, LED (Light Emitting Diode) display panel, MiniLED (Mini Light Emitting Diode) display panel, MicroLED (Micro Light Emitting Diode) display panel, OLED (Organic Light-Emitting Diode) display panel, and quantum dot LED display panel.

[0062] The touchscreen can be a capacitive touchscreen. The touchscreen is configured with a sensor array consisting of multiple first electrodes and multiple second electrodes, each of which is electrically connected to a touch panel integrated circuit (TPIC). For example, a capacitive touchscreen can use a transparent indium tin oxide (ITO) material to form the sensor array on the surface of a glass substrate.

[0063] Figure 1 This diagram illustrates a sensor array in a touchscreen according to an embodiment of the present disclosure, such as... Figure 1 As shown, along the X direction, there are M TX electrodes (TX1, TX2, TX3...TXM) arranged in total; along the Y direction, there are N RX electrodes (RX1, RX2, RX3...RXN) arranged in total. These M TX electrodes and N RX electrodes are not electrically connected, thus forming a sensing array that intersects the X and Y directions. M and N are both positive integers, and their specific values ​​can be configured according to requirements without limitation. The M TX electrodes constitute multiple first electrodes, and the N RX electrodes constitute multiple second electrodes, or vice versa.

[0064] As an example, a capacitive touchscreen can be a self-interoperable touchscreen; a self-interoperable touchscreen includes mutual capacitance mode and self capacitance mode.

[0065] For example, the touch chip is configured with multiple control circuits, each of which is electrically connected to a single electrode to control the state of that electrode to switch between a grounded state, a driving state, a receiving state, and a self-capacitance state. Specifically, for each first electrode, the touch chip is configured with a control circuit for controlling that first electrode; for each second electrode, the touch chip is configured with a control circuit for controlling that second electrode. The grounded state indicates that the electrode does not participate in transmitting or receiving excitation signals, and the electrode in the grounded state can serve as a shield or isolation. The driving state indicates that the electrode is used to transmit excitation signals, and the electrode in the driving state is used to transmit excitation signals in mutual capacitance mode. The receiving state indicates that the electrode is used to receive induction signals, and the electrode in the receiving state is used to receive induction signals in mutual capacitance mode. The self-capacitance state indicates that the electrode performs self-transmission and self-reception, and the electrode in the self-capacitance state is used to detect its own self-capacitance to ground in self-capacitance mode.

[0066] For example, Figure 2 This diagram illustrates the structure of a control circuit in a touch chip according to an embodiment of the present disclosure, as shown below. Figure 2 As shown, the control circuit includes: HCTRL control switch, LCTRL control switch, GCTRL control switch, S3 control switch, S4 control switch, and resistor R1. One end of resistor R1 is connected to electrode A, and the other end of resistor R1 is connected to one end of each of the LCTRL, HCTRL, GCTRL, S3, and S4 control switches. The other end of the HCTRL control switch is connected to the high voltage HVDD, the other end of the LCTRL control switch is connected to the low voltage LVDD, the other end of the GCTRL control switch is grounded, the other end of the S3 control switch is connected to MPATH, and the other end of the S4 control switch is connected to AFE IN. By configuring the HCTRL, LCTRL, GCTRL, S3, and S4 control switches to be on or off, the state of control electrode A can be switched between grounded, driven, received, and self-capacitive states. MPATH is an internal signal path / connection node in the touch chip's control circuit, which is disconnected in grounded, driving, receiving, and self-capacitive states. AFE IN is the signal input port of the touch chip's internal analog front-end circuit.

[0067] As an example, for any electrode, the corresponding control circuit can be configured to have the HCTRL control switch off, the LCTRL control switch off, the GCTRL control switch on, the S3 control switch off, and the S4 control switch off, thereby grounding the electrode. Figure 3 A waveform diagram of a control circuit is shown when the electrode is in a grounded state according to an embodiment of the present disclosure. Figure 3 As shown, the HCTRL control switch corresponds to a low level, the LCTRL control switch corresponds to a low level, and the GCTRL control switch corresponds to a high level.

[0068] As another example, for any electrode, the corresponding control circuit can be configured to have the S3 control switch open and the S4 control switch open, and the HCTRL control switch, LCTRL control switch, and GCTRL control switch turned on and off in turn, thereby putting the electrode in a driving state. Figure 4 This diagram shows a waveform of a control circuit when the electrode is in a driving state according to an embodiment of the present disclosure. Figure 5 Another waveform diagram of the control circuit when the electrode is in a driving state according to an embodiment of the present disclosure is shown; wherein, Figure 4 The waveform that generates the positive excitation signal is shown. Figure 5 The waveform that generates the negative excitation signal is shown; for example... Figure 4 and Figure 5 As shown, the corresponding level of the HCTRL control switch, LCTRL control switch, and GCTRL control switch changes periodically, thereby controlling the HCTRL control switch, LCTRL control switch, and GCTRL control switch to turn on and off in turn, and generating the waveform of the excitation signal accordingly.

[0069] As another example, for any electrode, the corresponding control circuit can be configured to have the HCTRL control switch off, LCTRL control switch off, GCTRL control switch off, S3 control switch off, and S4 control switch on, thereby putting the electrode in a receiving state. Figure 6 A waveform diagram of a control circuit is shown when the electrode is in a receiving state according to an embodiment of the present disclosure. Figure 6 As shown, the HCTRL control switch corresponds to a low level, the LCTRL control switch corresponds to a low level, and the GCTRL control switch corresponds to a low level.

[0070] As another example, for any electrode, the corresponding control circuit can be configured to have the S3 control switch and the LCTRL control switch open; the HCTRL control switch and the GCTRL control switch can be turned on and off alternately, and there is a detection gap between the two control switches being turned on. The S4 control switch is turned on during this detection gap, thereby making the electrode in a self-capacitive state. Figure 7The diagram shows a waveform of the control circuit when the electrode is in a self-capacitive state according to an embodiment of the present disclosure. Figure 7 As shown, the HCTRL and GCTRL control switches change their corresponding levels periodically, thereby controlling the HCTRL and GCTRL control switches to turn on and off alternately (i.e., reset in the figure), and receiving the sensing signal during the detection gap (i.e., sensing in the figure); accordingly, the waveforms of the excitation signal and the received sensing signal are generated.

[0071] In standard touch detection, when a finger or stylus, or other touch input device, touches the touchscreen, Figure 1 The sensor array in the touchscreen shown senses changes in capacitance, and the analog front end converts the sensed signal into a voltage signal. The voltage signal is then converted into a digital signal by an analog-to-digital converter, and then the digital signal processing unit performs logical operations on the digital signal to determine the touch position. In the mutual capacitance mode of the self-interconnected touchscreen, during touch detection, the current state of the control electrodes TX1, TX2, TX3...TXM of the touch chip's control circuit is in the driving state, while the current state of the control electrodes RX1, RX2, RX3...RXN is in the receiving state. The touch chip can periodically drive and collect sensing signals. For example, the M TX electrodes in the driving state respectively input periodic excitation signals (such as sine waves or square waves) from the touch chip. The different TX electrodes inputting excitation signals are equivalent to scanning the position of the touch operation on the horizontal axis. Since the human body is a good conductor, when the user's finger clicks a certain position on the touchscreen (i.e., a touch operation is generated), the finger will form a coupling capacitance with the touchscreen, thereby changing the capacitance value of the touch point at that position. The sensing signal (voltage or current) output by the RX electrode in the receiving state corresponding to that touch point to the touch chip changes accordingly, which is equivalent to determining the position of the touch operation on the vertical axis. That is, the horizontal and vertical coordinates of the touch operation are identified by the change in the capacitance value of the touch point. In the self-capacitance mode of a self-interconnected touchscreen, during touch detection, the control circuit of the touch chip controls the current state of electrodes TX1, TX2, TX3...TXM and RX1, RX2, RX3...RXN to be in a self-capacitance state. The touch chip can input excitation signals to TX1, TX2, TX3...TXM and RX1, RX2, RX3...RXN respectively, and detect the capacitance value between each electrode and the power supply ground, thereby identifying the coordinates of the touch operation by the change in capacitance value.

[0072] For example, using the above Figure 2 Taking the control circuit shown as an example, Figure 8 A schematic diagram of a detection circuit according to an embodiment of the present disclosure is shown, as follows: Figure 8As shown, it includes: a first control circuit, a second control circuit, electrode A, electrode B, a first circuit, and a second circuit. The first control circuit is used to control the state of electrode A, and the second control circuit is used to control the state of electrode B. The first control circuit and the second control circuit have the same structure as described above. Figure 2 The control circuit shown has one end connected to electrode A and the other end connected to the first circuit, and one end connected to electrode B and the other end connected to the second circuit. The first and second circuits have the same structure, but different functions are achieved based on the states of their corresponding electrodes. For example, they can function as current amplification circuits or matrix buffer circuits. Exemplarily, both the first and second circuits can include: a first unit (Amp1 in the figure), a second unit (Amp2 in the figure), and a third unit (Amp3 in the figure). The first unit is connected to MPATH and AFE IN, and one end of the second and third units is connected to the first unit, while the other end is connected to external devices.

[0073] In conventional touch detection, electrode A and electrode B are either electrodes in the X and Y directions, respectively; for example, electrode A is TX2 and electrode B is RX3. In mutual capacitance mode, in the first control circuit, control switch S3 is open and control switch S4 is open (i.e., the first circuit is not working), and it can proceed according to... Figure 4 or Figure 5 The periodic level fluctuations control the HCTRL, LCTRL, and GCTRL switches to turn on and off alternately, thereby providing a square wave voltage to electrode A. A mutual capacitance Cm exists between electrode A and electrode B. With the HCTRL, LCTRL, and GCTRL switches off, S3 switch off, and S4 switch on in the second control circuit, the voltage output from electrode B is converted into current, which is then transmitted to the second circuit, which acts as a current amplifier. The second circuit can amplify the current to determine the detection result. Specifically, the first unit amplifies the current, the second unit further outputs the positive-phase amplified current, and the third unit further outputs the inverse-phase amplified current.

[0074] In self-capacitance mode, taking the self-capacitance detection of electrode B as an example, in the second control circuit, control switch S3 is open and control switch LCTRL is open; and according to Figure 7The illustrated level periodic fluctuation controls the HCTRL and GCTRL control switches to alternately turn on and off. During the detection gap between the two control switches, the S4 control switch is turned on, thereby providing an excitation signal to electrode B. During the detection gap, the induced signal (such as a current value) is detected by the second circuit. For example, in the self-capacitance detection of electrode B, the first control circuit can be configured as a matrix buffer circuit (MBUF). Figure 9 The diagram shows a waveform corresponding to a matrix buffer circuit according to an embodiment of the present disclosure. Figure 9 and Figure 7 The corresponding waveforms are the same, such as Figure 9 As shown, in the first control circuit, control switch S4 is open and control switch LCTRL is open, and according to... Figure 9 The HCTRL and GCTRL control switches, which are shown to periodically change level, are turned on and off alternately to eliminate the non-theoretical charge generated by the parasitic capacitance of electrode A, so that electrode B can quickly compare current anomalies.

[0075] The aforementioned conventional touch detection methods are mainly designed for detecting touches such as fingers, and their accuracy and sensitivity are poor when detecting foreign objects; this disclosure is based on... Figure 1 The state of each electrode in the central sensing array is dynamically reconstructed, thereby achieving high-precision and high-sensitivity detection of foreign objects in the folding area of ​​touch screens, especially flexible screens, without increasing hardware costs.

[0076] Furthermore, a foreign object detection mode can be configured, allowing the touchscreen foreign object detection method of this disclosure embodiment to be executed in the foreign object detection mode. For example, it can be performed by... Figure 1 The states of the TX and RX electrodes of the sensor array shown are configured to achieve high-sensitivity foreign object detection based on existing hardware resources. It should be noted that the above... Figure 1 The sensor array shown and Figures 2-9 The circuits and waveforms shown are merely examples. The touch screen foreign object detection method provided in this disclosure is still applicable to other layouts of sensor arrays, circuits, and waveforms.

[0077] For example, the triggering conditions for the foreign object detection mode can be configured according to requirements: for instance, for foldable screens, the folding can be initiated in response to a user's folding operation. Another example is that the foreign object detection mode can be triggered when the angle between the two display surfaces of the foldable screen is less than or equal to a preset angle threshold. Yet another example is that the foreign object detection mode can be periodically entered during idle periods when the user is not using the touchscreen to detect foreign objects.

[0078] For example, the foreign object detection method for touch screens provided in this disclosure can be executed on a touch chip, such as an On-Cell touch chip or an In-Cell touch chip; preferably, it can be an On-Cell touch chip. Furthermore, the touch chip can be configured independently or integrated with a display chip, i.e., using Touch and Display Driver Integration (TDDI) technology.

[0079] Figure 10 A flowchart illustrating a foreign object detection method for a touchscreen according to an embodiment of this disclosure is shown. Figure 10 As shown, the method may include the following steps:

[0080] Step 201: Group the plurality of second electrodes to determine at least one group of second electrodes.

[0081] For example, different second electrode groups contain different second electrodes, and each second electrode group includes at least three second electrodes. For example, regarding the above... Figure 1 In a sensor array, if M electrodes in the X direction are used as multiple second electrodes, the M electrodes can be grouped along the X direction to determine at least one second electrode group; if N electrodes in the Y direction are used as multiple second electrodes, the N electrodes can be grouped along the Y direction to determine at least one second electrode group.

[0082] For example, the number of second electrodes in each second electrode group can be determined based on the total number of second electrodes in the induction array. If, during the grouping process, the remaining second electrodes do not meet the grouping conditions (e.g., the number is less than three), the number of second electrodes in other second electrode groups can be adjusted so that all second electrodes can be grouped. Alternatively, the current state of the remaining second electrodes can be directly configured to the ground state.

[0083] In one possible implementation, the second electrodes within the same second electrode group are arranged consecutively. This sampling method, which groups the electrodes consecutively, traverses all the second electrodes to obtain at least one second electrode group. The consecutive arrangement of the second electrodes within these groups facilitates driving and detection by the touch chip and ensures the continuity of the detection area. For example, in the above... Figure 1 In the sensor array shown, along the X direction, electrodes TX1, TX2, and TX3 are grouped into one group, and TX4, TX5, TX6, and TX7 are grouped into another group. In this way, by traversing all M electrodes (M is greater than 7), multiple second electrode groups are obtained.

[0084] In one possible implementation, the number of second electrodes in each of the at least one second electrode group is the same. That is, each second electrode group contains the same number of second electrodes; for example, each second electrode group contains 4 second electrodes. This uniform grouping method facilitates unified planning of the scan timing, simplifies the algorithm complexity, ensures consistent data acquisition in each scan, and facilitates subsequent data processing and analysis. For example, all second electrodes can be grouped according to a preset number of second electrodes, thereby obtaining multiple second electrode groups containing the same number of second electrodes. For example, if the preset number of second electrodes is 4, in the above... Figure 1 In the sensor array shown, along the X direction, electrodes TX1, TX2, TX3, and TX4 are grouped into one group, and TX5, TX6, TX7, and TX8 are grouped into another group. In this way, by traversing all M electrodes (M is greater than 8), multiple second electrode groups are obtained, each containing 4 TX electrodes.

[0085] Step 202: Configure the current state of each of the plurality of first electrodes to be grounded, and configure the current state of each of the at least one second electrode group to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states.

[0086] In the first mutual capacitance sensing array, the current state of each first electrode is grounded, thereby activating the shielding or isolation function. Simultaneously, each second electrode is configured in a polymorphic manner to reconstruct the electrode state, ensuring that at least three second electrodes in the same second electrode group have different current states. That is, the same second electrode group includes at least a grounded second electrode, a driving second electrode, and a receiving second electrode, thus enabling the detection of induced signals within the same second electrode group.

[0087] The configuration of the state of each electrode can be implemented based on the existing structure of the touch chip. For example, for a touch chip configured with a control circuit, the current state of the corresponding electrode can be switched between grounding state, driving state, and receiving state by controlling the on and off of the switch in the control circuit corresponding to each electrode.

[0088] For example, it can be done through the above Figure 2 The control circuit of the touch chip shown is configured to switch the current state of the corresponding electrode between grounding, driving, and receiving states.

[0089] In one possible implementation, the number of second electrodes in each second electrode group is the same; and the current state of the second electrodes corresponding to the same position in different second electrode groups is the same. That is, a unified state configuration sequence is used to cyclically configure the current state of the second electrodes in each second electrode group, thereby ensuring the uniformity of detection sensitivity across the entire touchscreen and avoiding blind spots caused by configuration differences. For example, the number of second electrodes in each second electrode group is 4, as described above... Figure 1 In the sensor array shown, electrodes TX1, TX2, TX3, and TX4 are in the same second electrode group, and electrodes TX5, TX6, TX7, and TX8 are in the same second electrode group. Therefore, the current states of TX1 and TX5 are configured to be the same (e.g., both are in the ground state), the current states of TX2 and TX6 are configured to be the same (e.g., both are in the drive state), the current states of TX3 and TX7 are configured to be the same (e.g., both are in the ground state), and the current states of TX4 and TX8 are configured to be the same (e.g., both are in the receive state).

[0090] In one possible implementation, at least one second electrode in a grounded state is included between the second electrode currently in a receiving state and the second electrode currently in a driving state in the first mutual capacitance sensor array. Since the grounded electrode can act as a shield or isolation, configuring a grounded second electrode between the receiving and driving electrodes effectively prevents signal short circuits or crosstalk. If adjacent second electrodes are both in a driving or receiving state, signal conflicts may occur, preventing effective coupling between the excitation and sensing signals within the same second electrode group. Therefore, by configuring a grounded second electrode to separate the driving and receiving electrodes, the normal operation of the mutual capacitance sensor array and the accuracy of the detection data from each second electrode group are ensured. For example, in the above... Figure 1 In the sensor array shown, electrodes TX1, TX2, TX3, and TX4 are in the same second electrode group. The current state of the four electrodes can be configured sequentially as: ground state, drive state, ground state, receive state, or drive state, ground state, ground state, receive state, or ground state, receive state, ground state, drive state, or drive state, ground state, receive state, ground state, drive state, or receive state, ground state, ground state, drive state, or receive state, ground state, drive state, ground state.

[0091] Step 203: Scan the first mutual capacitance sensor array to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group.

[0092] The touch chip can obtain one frame of scan data by scanning the entire first mutual capacitance sensor array once. One frame of scan data may include touch detection data corresponding to each second electrode group. For example, the touch screen can be scanned regularly, and the scanning frequency and time can be set according to the actual application.

[0093] For example, the touch chip sends an excitation signal to the second electrode in the reconstructed first capacitive sensing array, which is currently in a driving state, and receives the sensing signal through the second electrode in a receiving state; thereby obtaining touch detection data (such as capacitance value, voltage value, current value, etc.) corresponding to each second electrode group. This touch detection data can reflect the characteristics of the second electrodes in the touch screen sensing array along their corresponding arrangement direction, for example... Figure 1 If the M TX electrodes are multiple second electrodes, then the touch detection data corresponding to each group of second electrodes can reflect the characteristics in the X direction of the sensing array.

[0094] For example, the above can be used Figure 8 The detection circuit shown scans the first mutual capacitance sensor array in mutual capacitance mode; wherein, Figure 8 Electrode A and electrode B are the second electrode in the same second electrode group, currently in the driving state and currently in the receiving state, respectively.

[0095] Step 204: Determine the first foreign object detection result based on the touch detection data corresponding to each of the second electrode groups.

[0096] For example, the collected touch detection data can be compared with a preset benchmark value. If an anomaly is detected in the touch detection data of one or more sets of second electrodes, it is determined that a foreign object is present.

[0097] By following steps 201-204 above, no additional hardware needs to be set up. Based on existing hardware resources, it is possible to detect the presence of foreign objects on the surface of the foldable screen during the folding process, thereby saving hardware costs. High-sensitivity detection is particularly effective for non-conductive foreign objects, such as plastics.

[0098] Furthermore, if a foreign object is detected, an alarm can be proactively issued to the user or a protection mechanism can be triggered. For example, a visual alarm can be issued, such as displaying a prominent warning icon or text on the screen (e.g., "Foreign object detected, please remove before folding"). A tactile alarm can also be issued, for example, triggering motor vibration to attract the user's attention. Alternatively, a voice alarm can be issued, for example, by uttering "Foreign object detected, please remove before folding" through a speaker. For example, in electrically folding devices, the motor power can be directly cut off to stop the folding action and prevent damage to the screen.

[0099] In this embodiment of the present disclosure, for a touch screen configured with a sensor array consisting of multiple first electrodes and multiple second electrodes, the multiple second electrodes are grouped to determine at least one second electrode group; the current state of each of the multiple first electrodes is configured to be grounded, and the current state of each of the at least one second electrode group is configured to be grounded, driven, or received, forming a first mutual capacitive sensor array; wherein, at least three second electrodes in the same second electrode group have different current states; the first mutual capacitive sensor array is scanned to obtain touch detection data corresponding to each of the at least one second electrode group; based on the touch detection data corresponding to each of the second electrode groups, a first foreign object detection result is determined. In this way, by grouping multiple second electrodes in the touchscreen and dynamically reconstructing the current state of the first and second electrodes, a novel mutual capacitance sensing array (i.e., the first mutual capacitance sensing array) is formed. Through this dynamic reconstruction method, the high sensitivity of the mutual capacitance mode can be utilized to accurately capture the capacitance changes of the touchscreen. Without increasing the additional hardware cost, high-precision detection of foreign objects on the touchscreen (especially foldable screens) can be achieved. This allows for timely and accurate detection of foreign objects on the touchscreen before damage occurs, and can then proactively issue an alarm to the user or trigger a protection mechanism, effectively avoiding the inconvenience and economic losses caused by touchscreen damage. This is especially effective for protecting flexible OLED screens, which have delicate structures and high costs.

[0100] Figure 11 A flowchart illustrating another method for detecting foreign objects on a touchscreen according to an embodiment of the present disclosure is shown, such as... Figure 11 As shown, it includes the following steps:

[0101] Step 301: Group the plurality of second electrodes to determine at least one group of second electrodes;

[0102] Step 302: Configure the current state of each of the plurality of first electrodes to be grounded, and configure the current state of each of the at least one second electrode group to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states.

[0103] Step 303: Scan the first mutual capacitance sensor array to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group.

[0104] Steps 301-303 above and the above Figure 10 Steps 201-203 are the same and will not be repeated here.

[0105] The first round of scanning is completed through steps 301-303 above, and the touch detection data corresponding to each second electrode group is obtained.

[0106] Step 304: Group the plurality of first electrodes to determine at least one first electrode group.

[0107] For specific grouping methods, please refer to Figure 10 The relevant statements in step 201 will not be repeated here.

[0108] Step 305: Configure the current state of each of the plurality of second electrodes to be grounded, and configure the current state of each of the at least one first electrode group to be grounded, driven, or received, to form a second mutual capacitance sensing array; wherein, at least three first electrodes in the same first electrode group have different current states.

[0109] The specific method for configuring the current state of each electrode can be found in [reference needed]. Figure 10 The relevant statements in step 202 will not be repeated here.

[0110] Step 306: Scan the second mutual capacitance sensor array to obtain touch detection data corresponding to each first electrode group in the at least one first electrode group.

[0111] For specific scanning methods, please refer to Figure 10 The relevant statements in step 203 will not be repeated here.

[0112] The touch detection data corresponding to each first electrode group can reflect the characteristics of the first electrodes in the touch screen sensing array along their corresponding arrangement direction. For example... Figure 1 If N RX electrodes are multiple first electrodes, then the touch detection data corresponding to each first electrode group can reflect the characteristics in the Y direction of the sensing array.

[0113] It should be noted that steps 304-306 above can also be performed before steps 301-303, and there is no limitation on this.

[0114] The second round of scanning is completed through steps 304-306 above, and the touch detection data corresponding to each first electrode group is obtained.

[0115] Step 307: Determine the first foreign object detection result based on the touch detection data corresponding to each of the second electrode groups and the touch detection data corresponding to each of the first electrode groups.

[0116] Since the touch detection data corresponding to each first electrode group can reflect the characteristics of the first electrodes in the touch screen sensor array along their corresponding arrangement direction, and the touch detection data corresponding to each second electrode group can reflect the characteristics of the second electrodes in the touch screen sensor array along their corresponding arrangement direction, combining the touch detection data corresponding to each second electrode group and the touch detection data corresponding to each first electrode group allows for precise location of foreign objects on the touch screen. For example, Figure 1 In a touchscreen array, N RX electrodes constitute multiple first electrodes, and M TX electrodes constitute multiple second electrodes. The touch detection data corresponding to the N RX electrodes reflects the features in the Y direction of the sensing array, while the touch detection data corresponding to the M TX electrodes reflects the features in the X direction. Through these two rounds of orthogonal scanning, the feature data of the foreign object in both the X and Y directions can be acquired. Combining these two methods allows for cross-location of the foreign object, meaning that not only is the presence of a foreign object known, but its precise location on the touchscreen can also be determined, greatly improving the accuracy and reliability of the detection.

[0117] Step 307 can be used as described above. Figure 10 Step 204: Based on the touch detection data corresponding to each of the second electrode groups, determine a possible implementation method for the first foreign object detection result.

[0118] In this embodiment, the current states of the first and second electrodes in the sensor array of the touch screen are dynamically reconstructed and two rounds of scanning are performed to obtain touch detection data corresponding to each second electrode group and touch detection data corresponding to each first electrode group. By using the touch detection data in two directions, dual verification of the presence of foreign objects and their precise positioning on the touch screen can be achieved.

[0119] Figure 12 A flowchart illustrating another method for detecting foreign objects on a touchscreen according to an embodiment of the present disclosure is shown, such as... Figure 12 As shown, it includes the following steps:

[0120] Step 401: Group the plurality of second electrodes to determine at least one group of second electrodes.

[0121] Step 402: Configure the current state of each of the plurality of first electrodes to be grounded, and configure the current state of each of the at least one second electrode group to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states.

[0122] Step 403: Scan the first mutual capacitance sensor array to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group.

[0123] Step 404: Determine the first foreign object detection result based on the touch detection data corresponding to each of the second electrode groups.

[0124] Steps 401-404 above and the above Figure 10 Steps 201-204 are the same and will not be repeated here.

[0125] For example, the above can also be performed. Figure 11 Steps 304-306 are performed to complete two rounds of scanning and determine the first foreign object detection result.

[0126] In this way, the presence of non-local foreign objects (such as plastic, paper, particles, etc.) can be detected through the above steps.

[0127] Step 405: Configure the current state of each of the plurality of second electrodes to a self-capacitive state to form a first self-capacitive sensing array; and scan the first self-capacitive sensing array to obtain touch detection data corresponding to each of the second electrodes; and / or, configure the current state of each of the plurality of first electrodes to a self-capacitive state to form a second self-capacitive sensing array; and scan the second self-capacitive sensing array to obtain touch detection data corresponding to each of the first electrodes.

[0128] The configuration of the state of each electrode can be achieved based on the existing structure of the touch chip.

[0129] For example, it can be done through the above Figure 8 The detection circuit shown, in self-capacitance mode, detects the first self-capacitive sensing array, in which... Figure 8 Electrode B is the second electrode in its current self-capacitive state, and electrode A can be the first electrode; in self-capacitive mode, the second self-capacitive sensing array is scanned. Figure 8 Electrode B is the second electrode, and electrode A can be the first electrode in its current state of self-containment.

[0130] In the first self-capacitive sensing array, the current state of each second electrode is self-capacitive. Thus, under the control of the touch chip, each second electrode detects the capacitance value between itself and the power supply ground through self-transmission and self-reception, and obtains the touch detection data corresponding to each second electrode.

[0131] In the second self-capacitive sensing array, the current state of each first electrode is self-capacitive. Thus, under the control of the touch chip, each first electrode detects the capacitance value between itself and the power supply ground independently through self-transmission and self-reception, thereby obtaining the touch detection data corresponding to each first electrode.

[0132] For example, in the above Figure 1In the sensor array shown, M TX electrodes are multiple second electrodes, and N RX electrodes are multiple first electrodes. Therefore, the current states of RX1, RX2, RX3...RXN can be configured as self-capacitive states, and N touch detection data points can be obtained through the first scan. Furthermore, the current states of TX1, TX2, TX3...TXM can be configured as self-capacitive states, and M touch detection data points can be obtained through the second scan.

[0133] Step 406: Determine the second foreign object detection result based on the touch detection data corresponding to each second electrode and / or the touch detection data corresponding to each first electrode.

[0134] For example, the collected touch detection data can be compared with a preset reference value. If an abnormality is detected in the touch detection data of one or more sets of first electrodes, it is determined that a foreign object is present; or, if an abnormality is detected in the touch detection data of one or more sets of second electrodes, it is determined that a foreign object is present.

[0135] For example, the location of the foreign object on the touch screen can be determined based on the touch detection data corresponding to each second electrode and the touch detection data corresponding to each first electrode. For instance, the intersection of the first electrode and the second electrode where the touch detection data is abnormal can be used to determine the location of the foreign object on the touch screen.

[0136] Thus, through steps 405-406 above, the presence of foreign objects (such as metal parts, charging cables, etc.) can be detected.

[0137] In this embodiment of the disclosure, a dual-mode collaborative detection strategy for co-located and non-co-located foreign objects is adopted for the self-contained capacitive touch screen. Specifically, a reconstructed mutual-capacitive sensor array is used to detect non-co-located foreign objects, while a self-capacitive sensor array is used to detect co-located foreign objects. These two detection modes complement each other, ensuring effective detection of foreign objects in various common scenarios.

[0138] This disclosure also provides a foreign object detection device for touch screens, which can be used to execute the technical solutions described in the above method embodiments.

[0139] Figure 13 This diagram illustrates a structural diagram of a foreign object detection device for a touchscreen according to an embodiment of the present disclosure. The touchscreen is configured with a sensing array consisting of a plurality of first electrodes and a plurality of second electrodes. Each first electrode and each second electrode are electrically connected to a touchscreen chip, such as... Figure 13As shown, the device includes: a first module 501, which groups the plurality of second electrodes to determine at least one second electrode group; a second module 502, which configures the current state of each first electrode in the plurality of first electrodes to be grounded, and configures the current state of each second electrode in the at least one second electrode group to be one of grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states; a third module 503, which scans the first mutual capacitance sensing array to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group; and a fourth module 504, which determines a first foreign object detection result based on the touch detection data corresponding to each second electrode group.

[0140] This disclosure also provides a foreign object detection system for touch screens, which can be used to execute the technical solutions described in the above method embodiments.

[0141] Figure 14 This diagram illustrates a structural diagram of a foreign object detection system for a touchscreen according to an embodiment of the present disclosure, as shown below. Figure 14 As shown, the touchscreen foreign object detection system includes a touchscreen and a touch chip. The touchscreen is configured with a sensor array consisting of multiple first electrodes and multiple second electrodes. Each first electrode and each second electrode is electrically connected to the touch chip. The touch chip is used to: group the multiple second electrodes to determine at least one second electrode group; configure the current state of each first electrode in the multiple first electrodes to be grounded, and configure the current state of each second electrode in the at least one second electrode group to be one of grounded, driving, or receiving, forming a first mutual capacitance sensor array; wherein at least three second electrodes in the same second electrode group have different current states; scan the first mutual capacitance sensor array to obtain touch detection data corresponding to each second electrode group in the at least one second electrode group; and determine a first foreign object detection result based on the touch detection data corresponding to each second electrode group.

[0142] In this embodiment of the present disclosure, for a touch screen configured with a sensor array consisting of multiple first electrodes and multiple second electrodes, the multiple second electrodes are grouped to determine at least one second electrode group; the current state of each of the multiple first electrodes is configured to be grounded, and the current state of each of the at least one second electrode group is configured to be grounded, driven, or received, forming a first mutual capacitive sensor array; wherein, at least three second electrodes in the same second electrode group have different current states; the first mutual capacitive sensor array is scanned to obtain touch detection data corresponding to each of the at least one second electrode group; based on the touch detection data corresponding to each of the second electrode groups, a first foreign object detection result is determined. In this way, by grouping multiple second electrodes in the touchscreen and dynamically reconstructing the current state of the first and second electrodes, a novel mutual capacitance sensing array (i.e., the first mutual capacitance sensing array) is formed. Through this dynamic reconstruction method, the high sensitivity of the mutual capacitance mode can be utilized to accurately capture the capacitance changes of the touchscreen. Without increasing the additional hardware cost, high-precision detection of foreign objects on the touchscreen (especially foldable screens) can be achieved. This allows for timely and accurate detection of foreign objects on the touchscreen before damage occurs, and can then proactively issue an alarm to the user or trigger a protection mechanism, effectively avoiding the inconvenience and economic losses caused by touchscreen damage. This is especially effective for protecting flexible OLED screens, which have delicate structures and high costs.

[0143] In some embodiments, the functions or modules of the apparatus and system provided in this disclosure can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0144] This disclosure also provides a touch chip, including the aforementioned foreign object detection device for touch screens.

[0145] This disclosure also provides a touch chip, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method.

[0146] This disclosure also provides a display device, including the above-described touchscreen foreign object detection system.

[0147] In one possible implementation, the touchscreen includes any one of a liquid crystal display panel, an organic light-emitting diode display panel, a quantum dot light-emitting diode display panel, a mini light-emitting diode display panel, and a micro light-emitting diode display panel.

[0148] This disclosure also provides an electronic device including the aforementioned display device. In some embodiments, the electronic device further includes a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the aforementioned method.

[0149] This disclosure does not limit the specific type of electronic device. Those skilled in the art can set it according to actual conditions and needs. For example, the electronic device can be user equipment (UE), mobile device, user terminal, terminal, handheld device, computing device, or vehicle-mounted device, etc. For example, some terminals include: display, smartphone or portable device, mobile phone, tablet computer, laptop computer, PDA, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, wireless terminal in vehicle network, etc.

[0150] This disclosure also provides a non-volatile computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0151] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method.

[0152] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0153] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A method for detecting foreign objects on a touchscreen, characterized in that, The touchscreen is configured with a sensor array consisting of multiple first electrodes and multiple second electrodes, each first electrode and each second electrode being electrically connected to a touch chip. The method includes: The plurality of second electrodes are grouped to determine at least one group of second electrodes; The current state of each of the plurality of first electrodes is configured to be grounded, and the current state of each of the at least one second electrode group is configured to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states. The first mutual capacitance sensor array is scanned to obtain touch detection data corresponding to each of the at least one second electrode group; Based on the touch detection data corresponding to each of the second electrode groups, the first foreign object detection result is determined.

2. The method according to claim 1, characterized in that, The second electrodes in the same second electrode group are arranged consecutively.

3. The method according to claim 1, characterized in that, The number of second electrodes in each of the second electrode groups is the same.

4. The method according to claim 3, characterized in that, The current state of the second electrode corresponding to the same position in different second electrode groups is the same.

5. The method according to claim 1, characterized in that, In the first mutual capacitance sensor array, at least one second electrode in the current state of grounding is included between the second electrode in the current state of receiving and the second electrode in the current state of driving.

6. The method according to claim 1, characterized in that, The method further includes: The plurality of first electrodes are grouped to determine at least one first electrode group; The current state of each of the plurality of second electrodes is configured to be grounded, and the current state of each of the at least one first electrode group is configured to be grounded, driven, or received, to form a second mutual capacitance sensing array; wherein, at least three first electrodes in the same first electrode group have different current states. The second mutual capacitance sensor array is scanned to obtain touch detection data corresponding to each first electrode group in the at least one first electrode group; The determination of the first foreign object detection result based on the touch detection data corresponding to each of the second electrode groups includes: The first foreign object detection result is determined based on the touch detection data corresponding to each of the second electrode groups and the touch detection data corresponding to each of the first electrode groups.

7. The method according to any one of claims 1-6, characterized in that, The method further includes: Configure the current state of each of the plurality of second electrodes to a self-capacitive state to form a first self-capacitive sensing array; and scan the first self-capacitive sensing array to obtain touch detection data corresponding to each of the second electrodes; and / or configure the current state of each of the plurality of first electrodes to a self-capacitive state to form a second self-capacitive sensing array; and scan the second self-capacitive sensing array to obtain touch detection data corresponding to each of the first electrodes; The second foreign object detection result is determined based on the touch detection data corresponding to each of the second electrodes and / or the touch detection data corresponding to each of the first electrodes.

8. A foreign object detection system for a touch screen, characterized in that, The touchscreen foreign object detection system includes a touchscreen and a touch chip. The touchscreen is configured with a sensing array consisting of multiple first electrodes and multiple second electrodes. Each first electrode and each second electrode is electrically connected to the touch chip. The touch chip is used for: The plurality of second electrodes are grouped to determine at least one group of second electrodes; The current state of each of the plurality of first electrodes is configured to be grounded, and the current state of each of the at least one second electrode group is configured to be grounded, driven, or received, forming a first mutual capacitance sensing array; wherein, at least three second electrodes in the same second electrode group have different current states. The first mutual capacitance sensor array is scanned to obtain touch detection data corresponding to each of the at least one second electrode group; Based on the touch detection data corresponding to each of the second electrode groups, the first foreign object detection result is determined.

9. A display device, characterized in that, Including the foreign object detection system for touch screens as described in claim 8.

10. The display device according to claim 9, characterized in that, The touch screen includes any one of a liquid crystal display panel, an organic light-emitting diode display panel, a quantum dot light-emitting diode display panel, a mini light-emitting diode display panel, and a micro light-emitting diode display panel.

11. An electronic device, characterized in that, Includes the display device as described in claim 9 or 10.

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