Pressure sensing circuit, control method and related device

Abstract

The embodiment of the invention provides a pressure sensing circuit, a control method and a related device, and relates to the technical field of terminals. The circuit comprises a control unit and M rows * N columns of pressure sensing units, the resistance value of the pressure-sensitive unit changes along with the change of the pressure applied to the pressure-sensitive unit; any pressure sensing unit comprises a first end and a second end, the first ends of any row of pressure sensing units are connected together, and the second ends of any row of pressure sensing units are connected together; the control unit is used for selecting the pressure sensing units according to rows and obtaining output voltages of the pressure sensing units in the selected rows; wherein the output voltage of the pressure-sensitive unit changes along with the change of the pressure on the pressure-sensitive unit. Therefore, the electronic equipment can detect the output voltage of each pressure-sensitive unit in the multi-row and multi-column pressure-sensitive units, and analyzes the output voltage of all the pressure-sensitive units to confirm the pressure-sensitive units subjected to pressure. According to the position corresponding to the pressure sensing unit and the output voltage, independent reporting of the touch operation is achieved, and then the touch functions of single click, sliding and the like are achieved.

Description

Technical Field

[0001] This application relates to the field of terminal technologies, and in particular, to a pressure sensing circuit, a control method, and related devices. Background Art

[0002] Electronic devices such as wearable devices and mobile phones achieve touch response of the display screen through capacitive sensing.

[0003] However, in an underwater environment (such as swimming, underwater photography, etc.), electronic devices such as wearable devices and mobile phones cannot achieve touch response. Summary of the Invention

[0004] Embodiments of this application provide a pressure sensing circuit, a control method, and related devices, which are applied to the field of terminal technologies. An electronic device is provided with a plurality of rows and columns of pressure sensing units. The resistance value of the pressure sensing unit changes with the change of pressure. The electronic device can detect the output voltage of each pressure sensing unit and analyze the output voltages of all the pressure sensing units to confirm the pressure sensing units that are subjected to pressure. By realizing independent reporting of touch operations according to the positions corresponding to the pressure sensing units and the output voltages, touch functions such as single click and sliding are further realized. The pressure sensing circuit can improve the waterproof, anti-mis-touch, and touch control levels of the electronic device, and realize normal touch under running water such as a faucet; it can also realize the recognition of touch operations such as touching and sliding of the electronic device completely underwater, such as swimming and diving; in addition, the electronic device can realize functions such as camera shooting and video recording in an underwater environment, such as swimming and diving, and realize the normal use of the electronic device without an additional waterproof case.

[0005] In a first aspect, an embodiment of this application proposes a pressure sensing circuit. The circuit includes: a control unit and M rows * N columns of pressure sensing units; the resistance value of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit; any one of the pressure sensing units includes a first end and a second end, the first ends of any row of pressure sensing units are commonly connected, and the second ends of any row of pressure sensing units are commonly connected; the control unit is configured to select the pressure sensing units row by row and obtain the output voltages of the pressure sensing units in the selected row; wherein, the output voltage of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit.

[0006] In this way, pressure sensing units with multiple rows and columns are set. By detecting the output voltages of the respective pressure sensing units and analyzing the output voltages of all the pressure sensing units to confirm the pressure sensing units under pressure, the recognition of touch operations is realized according to the corresponding positions of the pressure sensing units. The pressure sensing circuit can improve the waterproof, anti-mis-touch and touch control levels of the electronic device, enabling normal touch under running water such as that of a faucet; it can also realize the recognition of operations such as touching and swiping on the electronic device completely underwater, such as swimming and diving; in addition, it enables the electronic device to realize functions such as camera shooting and video recording in an underwater environment, such as swimming and diving, and enables the normal use of the electronic device without an additional waterproof case.

[0007] In a possible implementation, any one of the pressure sensing units includes: a first pressure sensing module and a first voltage dividing module; the first end of the first pressure sensing module is the first end of the pressure sensing unit, the second end of the first pressure sensing module is connected to the first end of the first voltage dividing module, and the second end of the first voltage dividing module is the second end of the pressure sensing unit; the resistance value of the first pressure sensing module changes with the change of the pressure received; the first voltage dividing module and the first pressure sensing module are used to divide the voltage across the pressure sensing unit, so that the output voltage of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit.

[0008] The pressure sensing unit is composed of two modules in series, with a simple structure and small occupied area. In this way, the electronic device can distribute more pressure sensing units, increasing the distribution density of the pressure sensing units in the electronic device and improving the accuracy of touch operation recognition.

[0009] In a possible implementation, the first pressure sensing module includes: at least one piezoresistor, and the resistance value of the piezoresistor changes with the change of the pressure received.

[0010] In this way, the change of the output voltage is realized through the piezoresistor, with a simple principle and easy to implement.

[0011] In a possible implementation, the resistance value of the first voltage dividing module changes with the change of the pressure received.

[0012] In this way, the first voltage dividing module can also change according to the pressure change, enhancing the pressure sensing of the pressure sensing unit.

[0013] In a possible implementation, the pressure sensing unit further includes: a support layer, and the support layer is used to provide a deformation space for the pressure sensing module, so that the pressure sensing module changes with the change of the pressure received by the pressure sensing module.

[0014] In this way, the pressure sensing unit has a certain deformation space and can generate deformation with the change of pressure to change the resistance value.

[0015] In a possible implementation, the first pressure sensing module is located on one side of the support layer, and the first voltage dividing module is located on the other side of the support layer.

[0016] In this way, when stacked, the projection area occupied by the pressure sensing units is relatively small, and more pressure sensing units can be arranged under the same projection area, improving the accuracy of the pressure sensing circuit in confirming the touch operation position and enhancing the sensing effect of the pressure sensing circuit.

[0017] In addition, if the first pressure sensing module can change with the applied pressure, the stacked distribution can further increase the pressure sensing of the pressure sensing units, improving the sensitivity to touch operations and enhancing the sensing effect of the pressure sensing circuit.

[0018] In a possible implementation, the first pressure sensing module and the first voltage dividing module are located on the same side of the support layer.

[0019] In this way, the pressure sensing module and the voltage dividing module are distributed in a plane, which can reduce the thickness of the pressure sensing units and is beneficial to the thinning of the electronic device. In addition, if the resistance value of the first voltage dividing module can change with the applied pressure, it can also increase the pressure sensing area of the pressure sensing units, improve the accuracy of the pressure sensing circuit in confirming the touch operation position, and enhance the sensing effect of the pressure sensing circuit.

[0020] In a possible implementation, the control unit includes: a first switch module and a first detection module; the first detection module is used to detect the output voltages of the pressure sensing units in the selected row; the first switch module includes M first output terminals, a first input terminal, and a second input terminal. The M first output terminals are respectively and correspondingly connected to the first ends of the M rows of pressure sensing units. The first input terminal is used to connect to a first voltage, and the second input terminal is used to connect to a second voltage, and the first voltage is different from the second voltage; when the second end of the first voltage dividing module is connected to the first voltage, the first switch module is used to control the M first output terminals to be connected to the second input terminal in turn to select the pressure sensing units row by row; or, when the second end of the first voltage dividing module is connected to the second voltage, the first switch module is used to control the M first output terminals to be connected to the first input terminal in turn to select the pressure sensing units row by row.

[0021] In this way, the control unit realizes the selection of a row of pressure sensing units by controlling the voltage change of multiple first output terminals. The control method is simple and easy to implement.

[0022] In a possible implementation, the second ends of the first pressure sensing modules in any column are commonly connected; the first detection module includes: N analog-to-digital converters; the N analog-to-digital converters are respectively and correspondingly connected to the second ends of the N columns of first pressure sensing modules; the N analog-to-digital converters are used to detect the output voltages of the pressure sensing units in the selected row.

[0023] In this way, each column of pressure sensing units shares one analog-to-digital converter for detection, which can reduce the number of analog-to-digital converters used, and lower the cost and occupied area of the pressure sensing circuit. In addition, the analog-to-digital converter detects the output voltage, and the method is simple and easy to implement.

[0024] In a possible implementation manner, the pressure sensing units are located on one side of the display screen to detect the pressure applied by the user on the other side of the display screen. In this way, by arranging the pressure sensing units at the display screen, the recognition of the touch operation of the display screen can be realized.

[0025] In a second aspect, an embodiment of the present application provides a pressure sensing circuit. The circuit includes: a control unit and an M-row * N-column pressure sensing unit; the resistance value of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit; any pressure sensing unit includes a first end and a second end, the first ends of any row of pressure sensing units are commonly connected, and the second ends of any column of pressure sensing units are commonly connected; the control unit is configured to select the pressure sensing units row by row and obtain the output voltages of the pressure sensing units in the selected row, or select the pressure sensing units one by one and obtain the output voltages of the selected pressure sensing units; wherein, the output voltage of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit.

[0026] In this way, a plurality of rows and columns of pressure sensing units are arranged. By detecting the output voltages of the pressure sensing units and analyzing the output voltages of all the pressure sensing units to confirm the pressure sensing units receiving pressure, and then realizing the recognition of the touch operation according to the corresponding positions of the pressure sensing units.

[0027] In a possible implementation manner, the pressure sensing circuit further includes: a second voltage dividing module; any pressure sensing unit includes: a second pressure sensing module; the control unit includes: a second switch module and a second detection module; the second detection module is configured to detect the output voltage of the selected pressure sensing unit; the second switch module includes M first output terminals, N second output terminals, a first input terminal, a second input terminal, a third input terminal and a fourth input terminal, the M first output terminals are respectively connected to the first ends of the M-row pressure sensing units, the N second output terminals are respectively connected to the second ends of the N-column pressure sensing units, the first input terminal is used for accessing a first voltage, and the second input terminal is used for accessing a second voltage; the first voltage is different from the second voltage; the second switch module is configured to control the M first output terminals to be connected to the first input terminal in turn, and control the N second output terminals to be connected to the third input terminal to realize the selection of the pressure sensing units one by one.

[0028] Among them, the third input terminal is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to a first voltage. The fourth input terminal is used to connect to a second voltage. The second switching module is used to control the M first output terminals to be connected to the second input terminal in turn, and the N second output terminals to be connected to the fourth input terminal in turn, so as to select the pressure sensing units one by one. Or, the third input terminal is used to connect to the first voltage, the fourth input terminal is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to the second voltage. The second switching module is used to control the M first output terminals to be connected to the first input terminal in turn, and the N second output terminals to be connected to the third input terminal in turn, so as to select the pressure sensing units one by one.

[0029] Multiple pressure sensing units share the voltage dividing module, which can reduce the number of voltage dividing modules in the pressure sensing circuit, reduce the cost and occupied area of the pressure sensing circuit. In this way, the electronic device can distribute more pressure sensing units, improve the distribution density of the pressure sensing units in the electronic device, and improve the accuracy of touch operation recognition.

[0030] In a possible implementation, the second pressure sensing module includes: at least one piezoresistor, and the resistance value of the piezoresistor changes with the change of the applied pressure.

[0031] In this way, the change of the output voltage is realized through the piezoresistor, and the principle is simple and easy to implement.

[0032] In a possible implementation, the second switching module includes: M first switches and N second switches; any one of the first switches includes: an output terminal and two input terminals; the output terminals of the M first switches are respectively connected to the first ends of the M rows of pressure sensing units in one-to-one correspondence; one input terminal of the M first switches is connected to the first voltage, and the other input terminal of the M first switches is connected to the second voltage; any one of the second switches includes: an output terminal and two input terminals; the output terminals of the N second switches are respectively connected to the second ends of the N columns of pressure sensing units in one-to-one correspondence; one input terminal of the N second switches is connected to the first voltage, and the other input terminal of the N second switches is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to the second voltage; or, one input terminal of the N second switches is connected to the second voltage, and the other input terminal of the N second switches is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to the first voltage.

[0033] In this way, the control unit realizes the selection of the pressure sensing units one by one by controlling the voltage changes of the multiple first output terminals and the second output terminals. The control method is simple and easy to implement.

[0034] In a possible implementation, the control unit further includes: a matrix controller; the matrix controller is used to control the switching connection of the M first output terminals and the N second output terminals, so as to select the pressure sensing units one by one.

[0035] In this way, individual selection of the pressure sensing units can be achieved.

[0036] In a possible implementation, the pressure sensing circuit includes: a second voltage dividing module; the second detection module includes: an analog-to-digital converter; the analog-to-digital converter is connected to one end of the second voltage dividing module; the analog-to-digital converter is used to detect the output voltages of the pressure sensing units in the selected row.

[0037] In this way, multiple pressure sensing units share one second voltage dividing module, and multiple pressure sensing units share one analog-to-digital converter for detecting the output voltages. The small number of voltage dividing modules and analog-to-digital converters in the pressure sensing circuit results in low cost and small occupied area of the pressure sensing circuit. In addition, the analog-to-digital converter detects the output voltage, with a simple method and easy implementation.

[0038] In a possible implementation, the pressure sensing circuit includes: N second voltage dividing modules, and the switching unit includes: N third input terminals or N fourth input terminals; one end of the N second voltage dividing modules is correspondingly connected to the N third input terminals one by one, or one end of the N second voltage dividing modules is correspondingly connected to the N fourth input terminals one by one; the second detection module includes: N analog-to-digital converters; the N analog-to-digital converters are correspondingly connected to the N second voltage dividing modules one by one; the N analog-to-digital converters are used to detect the output voltages of the selected pressure sensing units.

[0039] In this way, each column of pressure sensing units shares one second voltage dividing module, and each column of pressure sensing units shares one analog-to-digital converter for detecting the output voltages. The small number of voltage dividing modules and analog-to-digital converters in the pressure sensing circuit results in low cost and small occupied area of the pressure sensing circuit. In addition, the analog-to-digital converter detects the output voltage, with a simple method and easy implementation.

[0040] In a possible implementation, the pressure sensing circuit further includes: N third voltage dividing modules; any one pressure sensing unit includes: a third pressure sensing module; the first ends of the N third voltage dividing modules are connected to the second ends of N columns of pressure sensing units; the second end of the third voltage dividing module is connected to a first voltage or a second voltage; the control unit includes: a third switching module and a third detection module; the third detection module is used to obtain the output voltages of the pressure sensing units in the selected row; the third switching module includes M first output terminals, a first input terminal, and a second input terminal, the M first output terminals are correspondingly connected to the first ends of M rows of pressure sensing units one by one, the first input terminal is used to connect to the first voltage, and the second input terminal is used to connect to the second voltage; the first voltage is different from the second voltage.

[0041] When a first voltage is applied to the second end of the third voltage dividing module, the third switching module is configured to control the M first output ends to be connected to the second input end in turn, so as to select the pressure sensing units row by row; or, when a second voltage is applied to the second end of the third voltage dividing module, the third switching module is configured to control the M first output ends to be connected to the first input end in turn, so as to select the pressure sensing units row by row.

[0042] Multiple pressure sensing units share a voltage dividing module, which can reduce the number of voltage dividing modules in the pressure sensing circuit, reduce the cost and occupied area of the pressure sensing circuit. In this way, the electronic device can distribute more pressure sensing units, improve the distribution density of the pressure sensing units in the electronic device, and improve the accuracy of touch operation recognition.

[0043] In a possible implementation, the third pressure sensing module includes: at least one piezoresistor, and the resistance value of the piezoresistor changes with the applied pressure.

[0044] In this way, the change of the output voltage is realized through the piezoresistor, and the principle is simple and easy to implement.

[0045] In a possible implementation, the pressure sensing unit is located on one side of the display screen to detect the pressure of the user on the other side of the display screen. In this way, by setting the pressure sensing unit at the display screen, the recognition of the touch operation of the display screen can be realized.

[0046] In a fourth aspect, an embodiment of the present application provides a circuit board, which includes: the pressure sensing unit described in the first aspect or any possible implementation of the first aspect; or, the circuit board includes: the pressure sensing unit described in the second aspect or any possible implementation of the second aspect.

[0047] In a fifth aspect, an embodiment of the present application provides a chip, which includes: the control unit described in the first aspect or any possible implementation of the first aspect; or, the chip includes: the control unit described in the second aspect or any possible implementation of the second aspect.

[0048] In a sixth aspect, an embodiment of the present application provides an electronic device, which includes: the pressure sensing unit and the control unit described in the first aspect or any possible implementation of the first aspect; or, the electronic device includes: the pressure sensing unit and the control unit described in the second aspect or any possible implementation of the second aspect.

[0049] In a seventh aspect, an embodiment of the present application provides a control method. The method includes: the control unit selects the pressure sensing units row by row;

[0050] The control unit obtains the output voltages of the pressure sensing units in the selected row and transmits the output voltages of the pressure sensing units to the processor; the processor identifies the touch operation based on the output voltages of the pressure sensing units.

[0051] In a possible implementation, the control unit selects the pressure sensing units row by row, including: when a second voltage is applied to the second end of the first voltage dividing module, the control unit controls the M first output ends to be connected to the second input end in turn to select the pressure sensing units row by row; or, when a second voltage is applied to the second end of the first voltage dividing module, the control unit controls the M first output ends to be connected to the first input end in turn to select the pressure sensing units row by row.

[0052] In a ninth aspect, an embodiment of the present application provides a control method. The method includes: the control unit selects the pressure sensing units one by one; the control unit obtains the output voltages of the selected pressure sensing units and transmits the output voltages of the pressure sensing units to the processor; the processor identifies the touch operation based on the output voltages of the pressure sensing units.

[0053] In a possible implementation, the control unit selects the pressure sensing units one by one, including: when a first voltage is applied to the second end of the first voltage dividing module, the control unit controls the M first output ends to be connected to the second input end in turn, and the N second output ends to be connected to the fourth input end in turn to select the pressure sensing units one by one; or, when a second voltage is applied to the second end of the first voltage dividing module, the control unit controls the M first output ends to be connected to the first input end in turn, and the N second output ends to be connected to the third input end in turn to select the pressure sensing units one by one.

[0054] In a tenth aspect, an embodiment of the present application provides an electronic device, including a processor and a memory. The memory is used to store code instructions, and the processor is used to run the code instructions to execute the method described in the seventh aspect or any possible implementation manner of the seventh aspect, or execute the method described in the eighth aspect or any possible implementation manner of the eighth aspect.

[0055] In an eleventh aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction runs on a computer, the computer is enabled to execute the method described in the seventh aspect or any possible implementation manner of the seventh aspect, or execute the method described in the eighth aspect or any possible implementation manner of the eighth aspect.

[0056] In the eleventh aspect, an embodiment of the present application provides a computer program product including a computer program. When the computer program runs on a computer, it causes the computer to execute the method described in the seventh aspect or any possible implementation manner of the seventh aspect, or execute the method described in the eighth aspect or any possible implementation manner of the eighth aspect.

[0057] In the twelfth aspect, the present application provides a chip or a chip system. The chip or the chip system includes at least one processor and a communication interface. The communication interface and the at least one processor are interconnected by a line. The at least one processor is configured to run a computer program or instruction to execute the method described in the seventh aspect or any possible implementation manner of the seventh aspect, or execute the method described in the eighth aspect or any possible implementation manner of the eighth aspect. Among them, the communication interface in the chip can be an input / output interface, a pin, a circuit, etc.

[0058] In a possible implementation, the chip or the chip system described above in the present application further includes at least one memory, and instructions are stored in the at least one memory. The memory can be a storage unit inside the chip, such as a register, a cache, etc., or a storage unit of the chip (such as a read-only memory, a random access memory, etc.).

[0059] It should be understood that the third aspect to the twelfth aspect of the present application correspond to the technical solution of the first aspect or the technical solution of the second aspect of the present application. The beneficial effects obtained by each aspect and the corresponding feasible implementation manners are similar and will not be described in detail. Description of the Drawings

[0060] Figure 1 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

[0061] Figure 2 It is a schematic structural diagram of a pressure sensing circuit provided by an embodiment of the present application;

[0062] Figure 3 It is a schematic structural diagram of a pressure sensing unit provided by an embodiment of the present application;

[0063] Figure 4 It is a schematic structural diagram of a pressure sensing unit provided by an embodiment of the present application;

[0064] Figure 5 It is a schematic structural diagram of a pressure sensing circuit provided by an embodiment of the present application;

[0065] Figure 6 It is a schematic structural diagram of a pressure sensing unit provided by an embodiment of the present application;

[0066] Figure 7A structural schematic diagram of a pressure sensing circuit provided by an embodiment of the present application;

[0067] Figure 8 A structural schematic diagram of a pressure sensing circuit provided by an embodiment of the present application;

[0068] Figure 9 A structural schematic diagram of a control unit provided by an embodiment of the present application;

[0069] Figure 10 A structural schematic diagram of a pressure sensing circuit provided by an embodiment of the present application;

[0070] Figure 11 A flowchart of a control method provided by an embodiment of the present application;

[0071] Figure 12 A flowchart of a control method provided by an embodiment of the present application. Detailed implementation manners

[0072] For the convenience of clearly describing the technical solutions of the embodiments of the present application, the following briefly introduces some terms and technologies involved in the embodiments of the present application:

[0073] 1. Other terms

[0074] In the embodiments of the present application, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and roles. For example, the first chip and the second chip are only used to distinguish different chips, and do not limit their sequence. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and terms such as "first" and "second" do not necessarily limit being different.

[0075] It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly, using words such as "exemplary" or "for example" is intended to present related concepts in a specific manner.

[0076] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, both A and B exist simultaneously, and B exists alone, where A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (item)" or a similar expression thereof refers to any combination of these items, including any combination of a single item or plural items. For example, at least one (item) of a, b, or c may represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c may be single or multiple.

[0077] 2. Electronic device

[0078] The electronic device according to the embodiments of the present application may include a handheld device with touch function, a vehicle-mounted device, etc. For example, some electronic devices are: mobile phone, tablet computer, handheld computer, laptop computer, mobile internet device (MID), wearable device (such as smart watch, smart glasses, smart bracelet or smart jewelry, etc.), 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, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication function, computing device or other processing devices connected to a wireless modem, vehicle-mounted device, terminal device in a 5G network or terminal device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited thereto.

[0079] The electronic device in the embodiments of the present application may also be referred to as: terminal device, user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile terminal, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0080] In the embodiments of the present application, the electronic device or each network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also referred to as main memory). The operating system can be any one or more computer operating systems that implement service processing through processes. For example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system, etc. The application layer includes applications such as a browser, an address book, a word processing software, and an instant messaging software.

[0081] Electronic devices such as mobile phones achieve the recognition of touch operations such as pressing and sliding through capacitive sensing.

[0082] However, if the electronic device is in an underwater environment, the electronic device cannot achieve the recognition of touch operations such as pressing and sliding. This is because in an underwater environment, both the external water and people can be regarded as conductors, and capacitive sensing fails, so the electronic device cannot recognize touch operations.

[0083] Currently, the pressure sensor in the electronic device can be calibrated through the coordinate information provided by capacitive touch and the magnitude of the pressure can be recognized. However, the position positioning of touch operations cannot be achieved by using the pressure sensor alone.

[0084] Possible design one: The pressure sensor in the electronic device realizes pressure sensing through the Wheatstone bridge principle. The pressure sensor consists of 4 resistors. The resistance value of the piezoresistor is measured by 3 resistors with known resistance values. In this test method, at least the voltages at two positions need to be detected to measure the resistance value of the piezoresistor, and then the pressure received by the piezoresistor is measured.

[0085] It can be understood that the pressure sensor composed of four resistors has a large size and a thick thickness. If there are many such pressure sensors distributed, it will increase the size of the electronic device and the cost of the electronic device, which is not conducive to the thinning and low cost of the electronic device. In addition, in the electronic device, the number of channels of the reading chip, and in the pressure sensor that realizes pressure sensing through the Wheatstone bridge principle, it is necessary to detect the voltages at two positions and thus a double-layer wiring layout is required, and the wiring layout is complex.

[0086] In view of this, the embodiments of the present application provide a pressure sensing circuit, a control method and related devices. The electronic device is provided with a plurality of rows and columns of pressure sensing units. The resistance value of the pressure sensing unit changes with the pressure. The electronic device can detect the output voltages of each pressure sensing unit and analyze the output voltages of all the pressure sensing units to confirm the pressure sensing units that are subjected to pressure. By realizing independent reporting of touch points according to the positions corresponding to the pressure sensing units and the output voltages, touch functions such as single click and sliding are further realized.

[0087] The pressure sensing circuit can improve the waterproof, anti-mis-touch and touch control levels of the electronic device, and realize normal touch under running water such as a faucet; it can also realize the recognition of operations such as touching and sliding of the electronic device completely underwater, such as swimming and diving; in addition, it enables the electronic device to realize functions such as camera shooting and video recording in an underwater environment, such as swimming and diving, and realizes the normal use of the electronic device without an additional waterproof case.

[0088] In some embodiments, the pressure sensing units that are subjected to pressure are confirmed by comparing the output voltages of the pressure sensing units with a preset value, and thus the recognition of touch operations is realized.

[0089] Specifically, in the case of no touch operation, the pressure sensing units are not subjected to the pressure of the touch operation, the resistance values of each pressure sensing unit remain unchanged, and the output voltages of each pressure sensing unit are the same as or close to the preset value. In the case of a touch operation, a part of the pressure sensing units sense the pressure of the touch operation, the resistance values of the pressure sensing units change, and thus the output voltages corresponding to this part of the pressure sensing units are quite different from the preset value; another part of the pressure sensing units are not subjected to the pressure of the touch operation, the resistance values of the pressure sensing units remain unchanged, and thus the output voltages corresponding to this part of the pressure sensing units are the same as or close to the preset value. The position corresponding to the pressure sensing unit with an output voltage quite different from the preset value is the position of the touch operation.

[0090] In other embodiments, it is confirmed whether the pressure sensing units sense pressure by comparing the output voltages of multiple pressure sensing units, and thus the recognition of touch operations is realized.

[0091] Specifically, in the case of no touch operation, the pressure sensing unit is not under the pressure of touch operation, the resistance value of the pressure sensing unit remains unchanged, and the output voltages of each pressure sensing unit are the same or close. In the case of touch operation, some pressure sensing units sense the pressure of touch operation, the resistance value of the pressure sensing unit changes, and then the output voltage corresponding to this part of the pressure sensing unit changes; the other part of the pressure sensing units are not under the pressure of touch operation, the resistance value of the pressure sensing unit remains unchanged, and then the output voltages corresponding to this part of the pressure sensing units are the same or close.

[0092] It can be understood that in some embodiments, compared with the display screen, the area corresponding to the touch operation is relatively small. Therefore, the electronic device can count the output voltages of each pressure sensing unit, and the position corresponding to the pressure sensing unit with a relatively small frequency of the output voltage value is the position of the touch operation.

[0093] The pressure sensing circuit provided by the embodiments of the present application can be applied to an electronic device. For ease of understanding, the structure of the electronic device will be described below. Exemplarily, Figure 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

[0094] As Figure 1 shown, the electronic device includes: a display screen 10 and a rear cover 20. A middle frame 30, a pressure sensing circuit 40, and a battery 50 can be arranged between the display screen 10 and the rear cover 20. Among them, the pressure sensing circuit 40 can be arranged on the side of the middle frame 30 facing the display screen 10, and the pressure sensing circuit 40 can detect the pressure of touch operations such as clicks and swipes on the display screen.

[0095] The pressure sensing circuit 40 is used to detect touch operations on the display screen 10. In the embodiments of the present application, the pressure sensing circuit 40 includes: a plurality of pressure sensing units and a control unit. The resistance value of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit. The control unit can detect the output voltages of each pressure sensing unit. The electronic device can confirm whether the pressure sensing unit senses pressure according to the output voltages of each pressure sensing unit, and then realize the recognition of touch operations.

[0096] The structure of the pressure sensing circuit 40 can refer to the corresponding description below, and will not be elaborated here.

[0097] In the embodiments of the present application, the pressure sensing units in the pressure sensing circuit 40 can be pasted on one side of the display screen to detect the touch operations of the user on the other side of the display screen. In this way, the pressure sensing unit does not directly contact the display screen, which can reduce the mutual crosstalk of pressure sensing signals, touch signals, and display signals, and reduce the system redundancy.

[0098] The pressure sensing units in the pressure sensing circuit 40 can also be integrated in the driving panel of the display screen. In this way, the thickness of the electronic device can be further reduced, which is beneficial to the thinning of the electronic device.

[0099] In the embodiments of the present application, the pressure sensing circuit 40 may also be located at a position in the electronic device that requires touch sensing, and no specific limitation is made here.

[0100] The battery 50 may be disposed on the middle frame 30. For example, the battery 50 is disposed on a side of the middle frame 30 facing the rear cover 20; in some other embodiments, the battery 50 may also be disposed on a side of the middle frame 30 facing the display screen 10. No specific limitation is made here.

[0101] Among them, the battery 50 may be electrically connected to supply power to the pressure sensing circuit 40, the display screen 10, a processor (not shown), an internal memory (not shown), an external memory (not shown), a camera component (not shown), a communication module (not shown), and the like.

[0102] In the embodiments of the present application, the display screen 10 may be an organic light-emitting diode (OLED) display screen or a liquid crystal display (LCD). It should be understood that the display screen 10 may include a display and a touch device. The display is used to output display content to the user, and the touch device is used to receive touch events input by the user on the display screen 10.

[0103] The rear cover 20 may be a metal rear cover, a glass rear cover, a plastic rear cover, or a ceramic rear cover. In the embodiments of the present application, the material of the rear cover is not limited.

[0104] The middle frame 30 may include a metal plate 31 and a frame. Among them, the frame surrounds the outer edge of the metal plate 31. Exemplarily, the frame may include a top frame 32 and a bottom frame 33 that are oppositely disposed, and a left frame 34 and a right frame 35 that are oppositely disposed and located between the top frame 32 and the bottom frame 33. Among them, the metal plate 31 may be an aluminum plate, an aluminum alloy, or a magnesium alloy. Each frame may be a metal frame, a ceramic frame, or a glass frame. Among them, the metal middle frame 30 and the frame may be connected by welding, snap connection, or integrally formed, or the metal middle frame 30 and the frame are connected by plastic injection molding of a plastic part.

[0105] As Figure 1 shown, the electronic device may further include: a camera component and a flash (not shown), and the camera component may include a front camera component 61 and a rear camera component 62.

[0106] It should be noted that Figure 1 the structure of the electronic device shown in does not constitute a limitation on the electronic device, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements, different shapes, etc.

[0107] The following uses specific embodiments to elaborate in detail on the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The following several specific embodiments can be implemented independently or in combination with each other, and the same or similar concepts or processes may not be elaborated in some embodiments.

[0108] Figures 2 to 5 The shown pressure sensing circuit corresponds to the case where the control unit selects the pressure sensing units row by row. Figures 6 to 8 The shown pressure sensing circuit corresponds to the case where the control unit selects the pressure sensing units one by one. The following describes the pressure sensing circuit involved in the embodiments of the present application with reference to the accompanying drawings.

[0109] Exemplarily, Figure 2 is a schematic structural diagram of a pressure sensing circuit provided by an embodiment of the present application. As Figure 2 shown, the pressure sensing circuit includes: M rows * N columns of pressure sensing units 201, a control unit 202, M first traces 203, 1 second trace 204, and N third traces 205. The M first traces 203 correspond one-to-one with the M rows of pressure sensing units 201. The N third traces 205 correspond one-to-one with the N columns of pressure sensing units 201. In the embodiments of the present application,

[0110] As Figure 2 shown, each pressure sensing unit 201 includes: a first end 1a, a second end 1b, and a third end 1c. The first ends 1a of any row of pressure sensing units 201 are commonly connected through the first trace 203, and the first trace 203 is connected to the control unit 202. The second ends 1b of any row of pressure sensing units 201 are commonly connected through the second trace 204; the third ends 1c of any column of pressure sensing units 201 are commonly connected through the third trace 205, and the third trace 205 is connected to the control unit 202.

[0111] The first trace 203 and the second trace 204 are used to form a loop with the pressure sensing units in the selected row; the third trace 205 is used to transmit the output voltages of the pressure sensing units 201 in the selected row to enable the control unit 202 to detect the output voltages of the pressure sensing units 201 in this row. The second trace 204 can be multiple or one, and no specific limitation is made here.

[0112] In the embodiments of the present application, the resistance value of the pressure sensing unit 201 changes with the change of the pressure received by the pressure sensing unit 201. Exemplarily, the resistance value of the pressure sensing unit 201 can increase with the increase of the pressure received by the pressure sensing unit 201; the resistance value of the pressure sensing unit 201 can decrease with the increase of the pressure received by the pressure sensing unit 201, and no specific limitation is made here.

[0113] Figure 2In the circuit shown, the pressure sensing unit 201 may include: a pressure sensing module and a voltage dividing module. The pressure sensing module and the voltage dividing module are connected in series. The resistance value of the pressure sensing module changes with the pressure received by the pressure sensing unit 201. The pressure sensing module includes at least one pressure-variable resistor. The resistance value of the pressure-variable resistor changes with the pressure received.

[0114] The resistance value of the voltage dividing module may or may not change with the pressure received by the pressure sensing unit 201, and no specific limitation is made here. The voltage dividing module includes at least one resistor, and this resistor may or may not be a pressure-variable resistor, and no specific limitation is made here.

[0115] Exemplarily, taking the pressure sensing module including resistor A and the voltage dividing module including resistor B as an example, as Figure 3 shown, the pressure sensing unit includes: resistor A and resistor B. One end of resistor A is the first end 1a of the pressure sensing unit, the other end of resistor A is connected to one end of resistor B, the other end of resistor B is the second end 1b of the pressure sensing unit, and the other end of resistor A is the third end 1c of the pressure sensing unit. The resistance value of resistor A changes with the pressure received. The resistance value of resistor B may or may not change with the pressure received. No specific limitation is made here.

[0116] In some embodiments, the pressure sensing module and the voltage dividing module are distributed in a stacked manner (as shown in a in Figure 4 ).

[0117] In this way, when distributed in a stacked manner, the pressure sensing unit occupies a smaller projected area, and more pressure sensing units can be arranged under the same projected area, improving the accuracy of the pressure sensing circuit for confirming the touch operation position and enhancing the sensing effect of the pressure sensing circuit.

[0118] In addition, if the resistance value of the voltage dividing module can change with the pressure received, the stacked distribution can increase the pressure sensing of the pressure sensing unit, improve the sensitivity to touch operations, and enhance the sensing effect of the pressure sensing circuit.

[0119] In some other embodiments, the pressure sensing module and the voltage dividing module are distributed in a planar manner (as shown in b in Figure 4 ).

[0120] In this way, when the pressure sensing module and the voltage dividing module are distributed in a planar manner, the thickness of the pressure sensing unit can be reduced, which is beneficial to the thin and light of the electronic device. In addition, if the resistance value of the voltage dividing module can change with the pressure received, it can also increase the pressure sensing area of the pressure sensing unit, improve the accuracy of the pressure sensing circuit for confirming the touch operation position, and enhance the sensing effect of the pressure sensing circuit.

[0121] Based on the above embodiments, the pressure sensing unit 201 further includes: a support layer. The support layer is used to provide a deformation space for the pressure sensing module. In this way, the pressure sensing unit has a certain deformation space and can generate deformation with the change of pressure, resulting in a change in resistance value.

[0122] In the embodiments of the present application, the support layer can be composed of materials such as sponge and foam; the support layer can also be without using materials, leaving a part of the space to make the pressure sensing module suspended. The support layer can be located between the pressure sensing module and the voltage dividing module (as shown in a of Figure 4 ). The support layer can also be located on the same side of the pressure sensing module and the voltage dividing module (as shown in b of Figure 4 ).

[0123] Figure 2 In the circuit shown, the control unit 202 is used to select the pressure sensing unit 201 row by row and obtain the output voltage of each pressure sensing unit 201 in the selected row.

[0124] In some embodiments, the control unit 202 can select a row of pressure sensing units 201 in sequence. Exemplarily, the control unit 202 can first select the first row of pressure sensing units 201 and obtain the output voltage of the first row of pressure sensing units 201. After obtaining the output voltage of the first row of pressure sensing units 201, the control unit selects the second row of pressure sensing units 201 and obtains the output voltage of the second row of pressure sensing units 201. The control unit can select a row of pressure sensing units 201 in sequence until the output voltage of the last row of pressure sensing units 201 is obtained.

[0125] In other embodiments, the control unit 202 can also randomly select a row of pressure sensing units 201 and obtain the output voltage of each pressure sensing unit 201 in the selected row. The control unit 202 then selects a row of pressure sensing units 201 from the remaining one or more rows of pressure sensing units 201 and obtains the output voltage of each pressure sensing unit 201 in the selected row.

[0126] Figure 2 In the circuit shown, the control unit 202 can control the selection of the pressure sensing unit 201 by controlling the voltage of the first trace 203. Specifically, the control unit 202 can control the selection of the pressure sensing unit 201 in each row by controlling the voltage of the first trace 203 corresponding to each row of pressure sensing units 201.

[0127] In a possible implementation method 1, taking the grounding of the trace 204 as an example, when the voltage of the trace 203 is at a high level, a row of pressure sensing units 201 corresponding to the trace 203 is selected; when the voltage of the trace 203 is at a low level, a row of pressure sensing units 201 corresponding to the trace 203 is not selected. Exemplarily, taking the selection of the first row of pressure sensing units as an example, the control unit 202 can control the voltage of the trace 203 corresponding to the first row of pressure sensing units 201 to be at a high level, and control the voltages of the traces 203 corresponding to the second row to the last row of pressure sensing units 201 to be at a low level.

[0128] In this way, the pressure sensing units of the unselected rows remain at a low level, which can reset and calibrate the output voltages of the unselected pressure sensing units, reduce the crosstalk of the voltages at the voltage detection points of the pressure sensing units, and improve the anti-interference ability.

[0129] In a possible implementation method 2, taking the voltage at the trace 204 being at a high level as an example, when the voltage of the trace 203 is at a low level, a row of pressure sensing units 201 corresponding to the trace 203 is selected; when the voltage of the trace 203 is at a high level, a row of pressure sensing units 201 corresponding to the trace 203 is not selected. Exemplarily, taking the selection of the first row of pressure sensing units as an example, the control unit 202 can control the voltage of the trace 203 corresponding to the first row of pressure sensing units 201 to be at a low level, and control the voltages of the traces 203 corresponding to the second row to the last row of pressure sensing units 201 to be at a high level.

[0130] Next, the structure of the control unit 202 will be described.

[0131] As Figure 2 shown, the control unit 202 includes: M switches 221 and N analog-to-digital converters (ADCs) 222. The M switches 221 correspond to the M traces 203 one by one, and the N ADCs 222 correspond to the N traces 205 one by one.

[0132] Any one of the switches 221 includes: an output terminal and two input terminals. Referring to Figure 2 , the output terminal 2a of the switch 221 is connected to the trace 203, the input terminal 2b of the switch 221 is used to input the first voltage VRH, and the input terminal 2c of the switch 221 is used to input the second voltage VRL. The first voltage is different from the second voltage. Exemplarily, the first voltage is at a high level and the second voltage is at a low level. The specific values of the first voltage and the second voltage in the embodiments of the present application are not limited.

[0133] The control unit 202 can control the voltage of the trace 203 corresponding to each row of pressure sensing units 201 by controlling the M switches 221, and further realize the control of whether the pressure sensing units 201 are selected or not.

[0134] The control unit 202 can detect the output voltage of the selected pressure sensing unit through N ADCs.

[0135] Exemplarily, taking the selection of the first row of pressure sensing units 201 as an example, the control unit 202 can control the connection between the output terminal 2a and the input terminal 2b in the switch 221 corresponding to the first row of pressure sensing units 201 to access the first voltage; the control unit 202 can control the connection between the output terminal 2a and the input terminal 2c in the switches 221 corresponding to the pressure sensing units 201 in the 2nd to Mth rows to access the second voltage. In this way, the first row of pressure sensing units 201 can be selected and the output voltage of the first row of pressure sensing units 201 can be obtained.

[0136] It can be understood that in the above Figure 2 shown embodiment, the selection of the pressure sensing unit is achieved through M switches 221. The M switches 221 can also be replaced by one or more switches. Exemplarily, taking the replacement with one switch as an example, the switch can include M output terminals and 2 input terminals. The M output terminals are respectively and correspondingly connected to M trace ones 203, and the 2 input terminals are respectively used to access the first voltage and the second voltage. Or, it can be understood that the M switches 221 are a structure of a switch module, and the switch module can also be replaced by other structures, for example, one or more switches. No specific limitation is made here.

[0137] The above Figure 2 shown embodiment, the detection of the output voltage of the pressure sensing unit 201 is achieved through the ADC 222. The ADC 222 can also be replaced by any voltage detection structure. For example, the output voltage of the pressure sensing unit 201 is detected through a voltmeter; the detection of the output voltage of the pressure sensing unit 201 and a preset value is achieved through the on-off of a switching tube. Or, it can be understood that the N ADCs 222 are a structure of a detection module, and the detection module can also be replaced by other structures, for example, N voltmeters, etc. No specific limitation is made here.

[0138] In this way, the pressure sensing unit includes two modules connected in series, and the judgment of whether the pressure sensing unit is stressed is achieved by detecting the voltage at the connection of the two modules. The traces involved in the detection are fewer. In addition, the structures of the two modules are simple and occupy a small area, which can improve the distribution density of the pressure sensing units in the electronic device and improve the accuracy of touch operation recognition.

[0139] From Figure 2 it can be seen that the control unit can detect the output voltage of the M-row and N-column pressure sensing units through M trace ones, N trace threes, and 1 trace two. The pressure sensing circuit involves M + N + 1 traces, with fewer traces, low difficulty, and easy to implement.

[0140] The aboveFigures 2 to 4 In the illustrated embodiments, the pressure sensing unit includes: a pressure sensing module and a voltage dividing module. In some embodiments, the pressure sensing unit may include: a pressure sensing module and does not include a voltage dividing module.

[0141] Exemplarily, Figure 5 FIG. is a schematic structural diagram of a pressure sensing circuit provided by an embodiment of the present application. As Figure 5 shown, the pressure sensing circuit includes: a pressure sensing unit 501, a control unit 502, M first traces 503, N second traces 504, and N voltage dividing modules 505. The M first traces 503 correspond one-to-one with M rows of pressure sensing units 501. The N second traces 504 correspond one-to-one with N columns of pressure sensing units 501. The N voltage dividing modules 505 correspond one-to-one with N columns of pressure sensing units 501.

[0142] As Figure 5 shown, each pressure sensing unit 501 includes: a first end 3a and a second end 3b. The first ends 3a of any row of pressure sensing units 501 are commonly connected through the first trace 503, and the first trace 503 is connected to the control unit 502. The second ends 3b of any column of pressure sensing units 501 are commonly connected through the second trace 504, and the second trace 504 is connected to the control unit 502.

[0143] The N voltage dividing modules 505 are connected to the second ends of the N columns of pressure sensing units 501 in a one-to-one correspondence through the second traces 504. The voltage dividing module 505 is used to perform voltage division with the selected pressure sensing unit 501 to enable the output voltage of the pressure sensing unit 501 to be different under different pressures. In addition, the voltage dividing module 505 can also reduce the damage caused by the too small resistance of the pressure sensing unit 501 resulting in too large current in the pressure sensing unit 501.

[0144] The first trace 503 and the second trace 504 are used to form a loop with each pressure sensing unit in the selected row; the second trace 504 is also used to transmit the output voltage of each pressure sensing unit 501 in the selected row to enable the control unit 502 to detect the output voltage of the pressure sensing units 501 in this row.

[0145] In the embodiments of the present application, the resistance value of the pressure sensing unit 501 changes with the change of the pressure received by the pressure sensing unit 501. Exemplarily, the resistance value of the pressure sensing unit 501 may increase with the increase of the pressure received by the pressure sensing unit 501; the resistance value of the pressure sensing unit 501 may decrease with the increase of the pressure received by the pressure sensing unit 501, and no specific limitation is made here.

[0146] In the embodiments of the present application, the pressure sensing unit 501 includes a pressure sensing module. The pressure sensing module includes at least one pressure-variable resistor. The resistance value of the pressure-variable resistor changes with the change of the received pressure.

[0147] Based on the above embodiments, the pressure sensing unit 501 further includes: a support layer. The support layer is used to provide a deformation space for the pressure sensing module.

[0148] In the embodiments of the present application, the support layer may be composed of materials such as sponge and foam; the support layer may also be without materials, leaving a part of the space so that the pressure sensing module is suspended. In this way, the pressure sensing unit has a certain deformation space and can generate deformation with the change of pressure to change the resistance value. Exemplarily, as Figure 6 shown, the pressure sensing unit includes: a pressure sensing module and a support layer. If the pressure sensing unit is pasted on the display screen, the pressure sensing module is located between the display screen and the support layer.

[0149] Figure 5 In the circuit shown, the control unit 502 is used to select the pressure sensing unit 501 row by row and obtain the output voltage of each pressure sensing unit 501 in the selected row.

[0150] In the embodiments of the present application, the control unit 502 may select a row of pressure sensing units 501 in sequence, or the control unit may randomly select a row of pressure sensing units 501. The specific selection method may refer to the corresponding description above Figure 2 and will not be elaborated here.

[0151] As Figure 5 shown, the control unit 502 can control whether the pressure sensing unit 501 is selected by controlling the voltage of the first wire 503.

[0152] The specific control method may refer to the corresponding description above Figure 2 and is not limited here.

[0153] As Figure 5 shown, the control unit 502 may include: M switches 521 of the first type and N analog-to-digital converters (ADCs) 522. The M switches 521 of the first type correspond to the M first wires 503 one by one, and the N ADCs 522 correspond to the N second wires 504 one by one.

[0154] Any one of the switches 521 of the first type includes: an output end and two input ends. Refer to Figure 5 . The output end 4a of the switch 521 of the first type is connected to the first wire 503, and the input end 4b of the switch 521 of the first type is used to input the first voltage VRH; the input end 4c of the switch 521 of the first type is used to input the second voltage VRL. The first voltage is different from the second voltage. Exemplarily, the first voltage is a high level and the second voltage is a low level. The embodiments of the present application do not limit the specific values of the first voltage and the second voltage.

[0155] Refer to Figure 5 . One end of any one of the voltage dividing modules 505 is connected to the second end 3b of the pressure sensing unit 501, and the other end of any one of the voltage dividing modules 505 is connected to the first voltage or the second voltage.

[0156] The ADC 522 is used to detect the output voltage of the pressure sensing unit 501. The ADC 723 can detect the voltage at one end of the voltage dividing module 505.

[0157] Figure 5 In the shown circuit, the control unit 502 can control the voltage of the trace 503 corresponding to each row of the pressure sensing unit 501 by controlling the M switches 521, so as to realize the control of whether each pressure sensing unit 501 is selected or not.

[0158] Specifically, taking the selection of the first row of pressure sensing units 501 as an example, the control unit 502 can control the connection between the output terminal 4a and the input terminal 4b in the first row of switches 521 corresponding to the pressure sensing unit. The control unit 502 can control the connection between the output terminal 4a and the input terminal 4c in the switches 521 corresponding to the pressure sensing units in the second row to the Mth row. In this way, the first row of pressure sensing units 501 can be selected, and the output voltage of the pressure sensing unit 501 in the first column of the first row can be obtained.

[0159] It can be understood that in the above Figure 5 shown embodiment, the selection of the pressure sensing unit is realized through the M switches 521. The M switches 521 can also be replaced by one or more switches. Exemplarily, taking the replacement with one switch as an example, the switch can include M output terminals and 2 input terminals. The M output terminals are respectively connected to the M traces 503 in one-to-one correspondence, and the 2 input terminals are respectively used to access the first voltage and the second voltage. Or, it can be understood that the M switches 521 are a structure of the switch module, and the switch module can also be replaced by other structures, such as one or more switches. No specific limitation is made here.

[0160] The above Figure 5 shown embodiment, the detection of the output voltage of the pressure sensing unit 501 is realized through the ADC522. The ADC522 can also be replaced by any voltage detection structure. For example, the output voltage of the pressure sensing unit 501 is detected through a voltmeter; the detection of the output voltage of the pressure sensing unit 501 and a preset value is realized through the on-off of a switching tube. Or, it can be understood that the N ADCs 522 are a structure of the detection module, and the detection module can also be replaced by other structures, such as N voltmeters, etc. No specific limitation is made here.

[0161] Figure 5 In the shown circuit, the pressure sensing unit includes a pressure sensing module with a small occupied area, which can improve the distribution density of the pressure sensing units in the electronic device and improve the accuracy of touch operation recognition. And each column of pressure sensing units shares a voltage dividing module, further reducing the occupied area of the pressure sensing circuit.

[0162] The judgment on whether the pressure sensing unit is stressed is realized by detecting the voltage at the connection between the detection pressure sensing unit and the voltage dividing module. Each column of pressure sensing units detects one position, and the wiring is simple. As can be seen from Figure 5 , the control unit can detect the output voltage of the pressure sensing units in M rows and N columns through M wiring ones and N wiring twos. The pressure sensing circuit involves M + N wirings, with a small number of wirings, low difficulty, and easy implementation.

[0163] In the above embodiment, the control unit selects the pressure sensing units row by row to obtain the output voltages of the pressure sensing units in the selected rows. The control unit can also select the pressure sensing units column by column to obtain the output voltages of the pressure sensing units in the selected columns. This pressure sensing circuit is similar in structure and implementation principle to the Figures 2 to 5 shown pressure sensing circuit structure, and the details will not be elaborated here.

[0164] Based on the above embodiment, the control unit may further include: a power supply, a digital control module, etc. The power supply is used to provide the working voltage for the reading chip. The digital control module is used to control whether the control unit works and to control the ADC to read the output voltage of the pressure sensing unit.

[0165] In the above Figures 2 to 6 shown embodiment, the pressure sensing units are selected row by row to obtain the output voltages of the pressure sensing units in the selected rows; the following will describe in conjunction with Figures 7 to 9 a pressure sensing circuit that selects the pressure sensing units one by one to obtain the output voltages of the pressure sensing units in the selected rows.

[0166] Exemplarily, Figure 7 is a schematic structural diagram of a pressure sensing circuit provided by an embodiment of the present application. As Figure 7 shown, the pressure sensing circuit includes: a pressure sensing unit 701, a control unit 702, M wiring ones 703, N wiring twos 704, and a voltage dividing module 705. The M wiring ones 703 correspond one by one to the M rows of pressure sensing units 701. The N wiring twos 704 correspond one by one to the N columns of pressure sensing units 701.

[0167] As Figure 7 shown, each pressure sensing unit 701 includes: a first end 6a and a second end 6b. The first ends 6a of any row of pressure sensing units 701 are commonly connected through the wiring one 703, and the wiring one 703 is connected to the control unit 702. The second ends 6b of any column of pressure sensing units 701 are commonly connected through the wiring two 704, and the wiring two 704 is connected to the control unit 702.

[0168] The voltage division module 705 is connected to the control unit 702. The voltage division module 705 is used to perform voltage division with the selected pressure sensing unit 701, so that the output voltage of the pressure sensing unit 701 is different under different pressures. In addition, the voltage division module 705 can also reduce the damage caused by the too small resistance value of the pressure sensing unit 701 resulting in too large current in the pressure sensing unit 701. The voltage division module 705 can be located inside the control unit 702 or can be independent of the control unit 702. No specific limitation is made here.

[0169] The first trace 703 and the second trace 704 are used to form a loop with each pressure sensing unit in the selected row; the second trace 704 is also used to transmit the output voltage of each pressure sensing unit 701 in the selected row, so as to enable the control unit 702 to detect the output voltage of the pressure sensing unit 701 in this row.

[0170] In the embodiment of the present application, the resistance value of the pressure sensing unit 701 changes with the change of the pressure received by the pressure sensing unit 701. Exemplarily, the resistance value of the pressure sensing unit 701 can increase with the increase of the pressure received by the pressure sensing unit 701; the resistance value of the pressure sensing unit 701 can decrease with the increase of the pressure received by the pressure sensing unit 701. No specific limitation is made here.

[0171] In the embodiment of the present application, the pressure sensing unit 701 includes a pressure sensing module. The pressure sensing module includes at least one piezoresistor. The resistance value of the piezoresistor changes with the change of the received pressure. The pressure sensing unit 701 may further include a support layer, and the support layer is used to provide a deformation space for the pressure sensing module. The support layer can refer to the corresponding description above and will not be elaborated here.

[0172] Figure 7 In the shown circuit, the control unit 702 is used to select the pressure sensing unit 701 one by one and obtain the output voltage of the selected pressure sensing unit 701.

[0173] In the embodiment of the present application, the control unit 702 can select the pressure sensing unit 701 one by one according to the sorting, or can randomly select the pressure sensing unit 701. The embodiment of the present application does not make a specific limitation on the selection order of the pressure sensing unit 701 by the control unit 702.

[0174] Exemplarily, the control unit 702 can first select the pressure sensing units in the first row one by one according to the arrangement order of the rows and obtain the output voltage of each pressure sensing unit 701 in the first row. After the control unit 702 obtains the output voltage of each pressure sensing unit 701 in the first row, it selects the pressure sensing units in each row one by one according to the arrangement order of the rows to obtain the output voltage of the corresponding pressure sensing unit 701 until the output voltage of the pressure sensing unit 701 in the last column of the last row is obtained.

[0175] Exemplarily, the control unit 702 can first select each pressure sensing unit in the first column one by one according to the arrangement order of columns, and obtain the output voltages of the pressure sensing units 701 in the first column. After the control unit 702 obtains the output voltages of the pressure sensing units 701 in the first column, it selects each pressure sensing unit one by one according to the arrangement order of columns to obtain the output voltages of each pressure sensing unit 701 until the output voltage of the pressure sensing unit 701 in the last row of the last column is obtained.

[0176] As Figure 7 shown, the control unit 702 can control whether the pressure sensing unit 701 is selected by controlling the voltage of the first trace 703 and the voltage of the second trace 704.

[0177] When the voltage of the first trace 703 is high level and the voltage of the second trace 704 is low level, among the pressure sensing units 701 in the row corresponding to the first trace 703, the pressure sensing unit corresponding to the low-level second trace 704 is selected; when the voltage of the first trace 703 is low level and the voltage of the second trace 704 is high level, among the pressure sensing units 701 in the row corresponding to the first trace 703, the pressure sensing unit corresponding to the low-level second trace 704 is selected.

[0178] When the voltages of both the first trace 703 and the second trace 704 are low level, the pressure sensing unit corresponding to the low-level second trace 704 among the pressure sensing units 701 in the row corresponding to the first trace 703 is not selected. When the voltages of both the first trace 703 and the second trace 704 are high level, the pressure sensing unit corresponding to the high-level second trace 704 among the pressure sensing units 701 in the row corresponding to the first trace 703 is not selected.

[0179] As Figure 7 shown, the control unit 702 can include: M first switches 721, N second switches 722, and an analog-to-digital converter (ADC) 723. The M first switches 721 correspond to the M first traces 703 one by one, and the N second switches 722 correspond to the N second traces 704 one by one.

[0180] Any one of the first switches 721 includes: an output terminal and two input terminals. Refer to Figure 7 , the output terminal 7a of the first switch 721 is connected to the first trace 703, the input terminal 7b of the first switch 721 is used to input the first voltage VRH; the input terminal 7c of the first switch 721 is used to input the second voltage VRL. The first voltage is different from the second voltage. Exemplarily, the first voltage is high level and the second voltage is low level. The embodiments of the present application do not limit the specific values of the first voltage and the second voltage.

[0181] Any switch two 722 includes: an output terminal and two input terminals. One input terminal of switch two 722 is used to connect to the voltage dividing module, and the other input terminal is used to access the first voltage or the second voltage.

[0182] In some embodiments, one input terminal of switch two 722 is used to connect to the voltage dividing module 705, and the other input terminal is used to access the first voltage.

[0183] See Figure 7 , the output terminal 8a of switch two 722 is connected to the trace two 704, the input terminal 8b of switch two 722 is used to input the first voltage VRH; the input terminal 8c of switch two 722 is used to connect to one end of the voltage dividing module 705, and the other end of the voltage dividing module 705 is grounded.

[0184] The ADC 723 is used to detect the output voltage of the pressure sensing unit 701. The ADC 723 can detect the voltage at one end of the voltage dividing module 705.

[0185] Figure 7 In the shown circuit, the control unit 702 can control the voltage of the trace one 703 corresponding to each row of the pressure sensing units 701 by controlling the M switches one 721, and control the voltage of the trace two 704 corresponding to each column of the pressure sensing units 701 by controlling the N switches two 722, so as to realize the control of whether each pressure sensing unit 701 is selected or not.

[0186] Specifically, taking the selection of the pressure sensing unit 701 in the first row and the first column as an example, the control unit 702 can control the connection between the output terminal 7a and the input terminal 7b in the switch one 721 corresponding to the pressure sensing unit in the first row; the control unit 702 can control the connection between the output terminal 8a and the input terminal 8c in the switch two 722 corresponding to the pressure sensing unit in the first column.

[0187] The control unit 702 can control the connection between the output terminal 7a and the input terminal 7c in the switch one 721 corresponding to the pressure sensing units from the second row to the Mth row; the control unit 702 can control the connection between the output terminal 8a and the input terminal 8b in the switch two 722 corresponding to the pressure sensing units from the second column to the Nth column.

[0188] In this way, it is possible to select the pressure sensing unit 701 in the first row and the first column and obtain the output voltage of the pressure sensing unit 701 in the first row and the first column.

[0189] In other embodiments, one input terminal of switch two 722 is used to connect to the voltage dividing module 705, and the other input terminal is used to access the second voltage.

[0190] See Figure 8, the output terminal 8a of switch two 722 is connected to trace two 704, the input terminal 8b of switch two 722 is connected to one end of voltage dividing module 705, and the other end of voltage dividing module 705 inputs the first voltage VRH. The input terminal 8c of switch two 722 is used to input the second voltage VRL.

[0191] ADC 723 is used to detect the output voltage of pressure sensing unit 701. ADC 723 can detect the voltage at one end of voltage dividing module 705.

[0192] Specifically, taking the selection of the pressure sensing unit 701 in the first row and first column as an example, control unit 702 can control the connection between output terminal 7a and input terminal 7c in switch one 721 corresponding to the pressure sensing units in the first row; control unit 702 can control the connection between output terminal 8a and input terminal 8b in switch two 722 corresponding to the pressure sensing units in the first column.

[0193] Control unit 702 can control the connection between output terminal 7a and input terminal 7b in switch one 721 corresponding to the pressure sensing units in the second row to the Mth row; control unit 702 can control the connection between output terminal 8a and input terminal 8c in switch two 722 corresponding to the pressure sensing units in the second column to the Nth column.

[0194] In this way, it is possible to select the pressure sensing unit 701 in the first row and first column and obtain the output voltage of the pressure sensing unit 701 in the first row and first column. In addition, the unselected pressure sensing units remain at a low level, which can reset and calibrate the output voltages of the unselected pressure sensing units, reduce the crosstalk of the voltages at the voltage detection points of the pressure sensing units, and improve the anti-interference ability.

[0195] It can be understood that in the above Figure 7 and Figure 8 illustrated embodiments, the selection or non-selection of the pressure sensing units is achieved through M switch ones and N switch twos. The M switch ones and N switch twos can also be replaced by one or more switches. Exemplarily, taking the replacement with one switch as an example, this switch can include M + N output terminals and 4 input terminals. Among them, M output terminals are respectively and correspondingly connected to M traces one 703, N output terminals are respectively and correspondingly connected to N traces two 704, and the 4 input terminals are respectively used to access the first voltage, the second voltage, the first voltage, and the second voltage. Or, it can be understood that M switch ones 721 and N switch twos 722 are a structure of a switch module, and the switch module can also be replaced by other structures, such as one or more switches. No specific limitation is made here.

[0196] The above Figure 7 and Figure 8In the illustrated embodiment, the output voltage of the pressure sensing unit 701 is detected by an ADC. The ADC can also be replaced by any voltage detection structure. For example, the output voltage of the pressure sensing unit 701 is detected by a voltmeter; the detection of the output voltage of the pressure sensing unit 701 and a preset value is achieved by whether a switching transistor is turned on or off. Or, it can be understood that the ADC 723 is a structure of the detection module, and the detection module can also be replaced by other structures, such as a voltmeter, etc. No specific limitation is made here.

[0197] In the above embodiment, one ADC is taken as an example. It is also possible that each column of pressure sensing units corresponds to one ADC and one voltage dividing module. No specific limitation is made here.

[0198] The above Figure 7 and Figure 8 In the illustrated pressure sensing circuit, the pressure sensing unit includes a pressure sensing module with a small occupied area, which can improve the distribution density of the pressure sensing units in the electronic device and the accuracy of touch operation recognition. And the M-row and N-column pressure sensing units can share one voltage dividing module, further reducing the occupied area of the pressure sensing circuit.

[0199] The judgment of whether the pressure sensing unit is stressed is achieved by detecting the voltage at the connection between the pressure sensing unit and the voltage dividing module. Each column of pressure sensing units detects one position, and the wiring is simple. From Figure 7 or Figure 8 it can be seen that the control unit can detect the output voltages of the M-row and N-column pressure sensing units through M wire paths one and N wire paths two. The pressure sensing circuit involves M + N wire paths, with a small number of wire paths, low difficulty, and easy implementation.

[0200] Based on the above embodiment, the control unit may further include: a power supply, a digital control module, etc. The power supply is used to provide the working voltage for the reading chip. The digital control module is used to control whether the control unit 702 works and to control the ADC to read the output voltage of the pressure sensing unit.

[0201] Figures 5 to 8 In the illustrated circuit, the control unit can select the pressure sensing units one by one through a matrix controller. Specifically, the matrix controller can control the switching connections of M switches one and the switching connections of N switches two.

[0202] Exemplarily, Figure 9 is a schematic structural diagram of a control unit provided by an embodiment of the present application. As Figure 9 shown, the control unit includes: a matrix controller 901, a digital control module 902, a sample and hold module 903, an ADC 904, M switches one 905 (only one is shown in the figure), and N switches two 906 (only one is shown in the figure).

[0203] The matrix controller 901 is used to control the switching connections of M switches 905 and the switching connections of N switches 906 to achieve the selection of the pressure sensing units one by one.

[0204] Exemplarily, the matrix controller 901 can generate row selection signals to control the switching connections of M switches 905, and generate column selection signals to control the switching connections of N switches 906.

[0205] The digital control module 902 is used to control whether the matrix controller 901 works or not, and to control the ADC 904 to read voltage signals.

[0206] The sample and hold module 903 is used to stabilize the output voltage of the selected pressure sensing unit.

[0207] The ADC 904 is used to collect the output voltage of the selected pressure sensing unit.

[0208] In this way, the control unit can achieve the above-mentioned selection of the pressure sensing units one by one.

[0209] The above Figures 2 to 9 In the pressure sensing circuit shown above, the control unit can detect the output voltages of the M-row and N-column pressure sensing units. The control unit can identify touch operations on the output voltages of the M-row and N-column pressure sensing units. The control unit can also transmit the output voltages of the M-row and N-column pressure sensing units to the processor in any form such as a table or a list. The processor identifies touch operations based on the transmitted output voltages of the M-row and N-column pressure sensing units.

[0210] Exemplarily, Table 1 is a voltage reading table provided by an embodiment of the present application. The voltage reading table shown in Table 1 is an M-row and N-column cell. The M-row and N-column cells correspond one-to-one to the M-row and N-column pressure sensing units.

[0211] Table 1 Voltage Reading Table

[0212] (1，1)2V (1，2)2V ...... (1, N - 1) 2V (1, N) 2V (2，1)2V (2，2)1.8V …… (2, N - 1) 2V (2, N) 2V (3，1)2V (3，2)1.2V …… (3, N - 1) 2V (3, N) 2V …… …… …… …… …… (M - 1, 1) 2V (M - 1, 2) 2V …… (M - 1, N - 1) 2V (M - 1, N) 2V (M, 1) 2V (M, 2) 2V …… (M, N - 1) 2V (M, N) 2V

[0213] As can be seen from Table 1, most of the cells in Table 1 correspond to a voltage of 2V, the cell corresponding to the second row and the second column has a voltage of 1.8V, and the cell corresponding to the third row and the second column has a voltage of 1.2V.

[0214] Taking the identification of touch operations by the difference between the output voltages of the M-row and N-column pressure sensing units as an example, the voltages corresponding to the cell in the second row and the second column, and the cell in the third row and the second column are different, that is, the pressure sensing units in the second row and the second column, and the pressure sensing units in the third row and the third column are both under pressure. By comparing the voltage values, it can be seen that the pressure sensing unit in the third row and the third column is under greater pressure, and the position of the touch operation is closer to the position corresponding to the pressure sensing unit in the third row and the third column.

[0215] Taking the recognition of a touch operation by comparing the output voltage of an M-row and N-column pressure sensing unit with a preset value, and the preset value being 2V as an example, the voltage corresponding to the cell in the second row and second column is different from the preset value, and the voltage corresponding to the cell in the third row and second column is different from the preset value, that is, the pressure sensing units in the second row and second column, and the third row and third column are both under pressure. Compared with the voltage corresponding to the cell in the second row and second column, the difference between the voltage corresponding to the cell in the third row and third column and the preset value is greater. Therefore, the position of the touch operation is closer to the position corresponding to the pressure sensing unit in the third row and third column.

[0216] It can be understood that the electronic device can Figures 2 to 9 implement the recognition of a single position and multiple positions being stressed through the pressure sensing circuit shown above, and further can implement the position recognition of single-point or multi-point touch, and implement the recognition of touch operations such as clicking and swiping.

[0217] It can be understood that in the above Figures 2 to 8 shown embodiment, the M-row and N-column pressure sensing units can be integrated on a flexible printed circuit (FPC), and this FPC can be pasted on one side of the display screen. The control unit in the above embodiment can be integrated in a chip. The chip can include: a power supply, a digital control module, etc. The power supply is used to provide the operating voltage for reading the chip. The digital control module is used to control whether the chip works and to control the ADC to read the output voltage of the pressure sensing unit.

[0218] The voltage dividing module can be located on the FPC, or in the control unit, or independent of the FPC and the control unit. No specific limitation is made here.

[0219] In the above embodiment, the M-row and N-column pressure sensing units can also be integrated on the driving panel of the display screen. The driving panel is used to drive the pixels in the display screen to light up. Exemplarily, the M-row and N-column pressure sensing units are integrated on a thin film transistor (TFT) driving panel. No specific limitation is made here.

[0220] Exemplarily, Figure 10 is a schematic structural diagram of an electronic device provided for the implementation of this application. As Figure 10As shown in the figure, the electronic device includes: a pressure sensing unit 1001 and a control unit 1002. The resistance value of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit. In a possible implementation mode 1, any pressure sensing unit 1001 includes a first end and a second end. The first ends of any row of pressure sensing units 1001 are commonly connected, and the second ends of any row of pressure sensing units 1001 are commonly connected; the control unit 1002 is configured to select the pressure sensing units 1001 row by row and obtain the output voltages of the pressure sensing units 1001 in the selected row. The output voltage of the pressure sensing unit 1001 changes with the change of the pressure received by the pressure sensing unit 1001.

[0221] In the embodiments of the present application, the pressure sensing unit 1001 may correspond to the pressure sensing unit 201 in the above text, and the control unit 1002 may correspond to the control unit 202.

[0222] In this way, a plurality of rows and columns of pressure sensing units are provided. By detecting the output voltages of the pressure sensing units and analyzing the output voltages of all the pressure sensing units to confirm the pressure sensing units that receive pressure, the recognition of touch operations is realized according to the positions corresponding to the pressure sensing units. In addition, the first ends of a row of pressure sensing units 1001 are commonly connected, and the first ends of a row of pressure sensing units 1001 can share the same wiring connection. The second ends of a row of pressure sensing units 1001 are commonly connected, and the second ends of a row of pressure sensing units 1001 can share the same wiring connection, reducing the wiring of the pressure sensing circuit and making the wiring layout simple.

[0223] In a possible implementation mode, any pressure sensing unit includes: a first pressure sensing module and a first voltage dividing module; the first end of the first pressure sensing module is the first end of the pressure sensing unit, the second end of the first pressure sensing module is connected to the first end of the first voltage dividing module, and the second end of the first voltage dividing module is the second end of the pressure sensing unit; the resistance value of the first pressure sensing module changes with the change of the received pressure; the first voltage dividing module and the first pressure sensing module are configured to divide the voltage across the pressure sensing unit, so that the output voltage of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit.

[0224] The first pressure sensing module may correspond to the pressure sensing module of the pressure sensing unit 201 in the above text; the first voltage dividing module may correspond to the voltage dividing module of the pressure sensing unit 201 in the above text.

[0225] The pressure sensing unit is composed of two modules connected in series, the structure of the pressure sensing unit is simple, and the occupied area is small. In this way, more pressure sensing units can be distributed in the electronic device, improving the distribution density of the pressure sensing units in the electronic device and improving the accuracy of touch operation recognition.

[0226] In a possible implementation mode, the first pressure sensing module includes: at least one pressure-variable resistor, and the resistance value of the pressure-variable resistor changes with the change of the received pressure.

[0227] In this way, the output voltage is changed by the piezoresistor, and the principle is simple and easy to implement.

[0228] In a possible implementation, the resistance value of the first voltage dividing module changes with the pressure received.

[0229] In this way, the first voltage dividing module can also change according to the pressure change, improving the pressure sensing of the pressure sensing unit to the pressure.

[0230] In a possible implementation, the pressure sensing unit further includes: a support layer, and the support layer is used to provide a deformation space for the pressure sensing module, so that the pressure sensing module changes with the pressure received by the pressure sensing module.

[0231] In this way, the pressure sensing unit has a certain deformation space and can generate deformation with the pressure change to change the resistance value.

[0232] In a possible implementation, the first pressure sensing module is located on one side of the support layer, and the first voltage dividing module is located on the other side of the support layer.

[0233] In this way, when stacked, the projection area occupied by the pressure sensing unit is small, and more pressure sensing units can be arranged under the same projection area, improving the accuracy of the pressure sensing circuit for confirming the touch operation position and the sensing effect of the pressure sensing circuit.

[0234] In addition, if the first pressure sensing module can change with the pressure received, the stacked distribution can further increase the pressure sensing of the pressure sensing unit to the pressure, improving the sensitivity to the touch operation and the sensing effect of the pressure sensing circuit.

[0235] In a possible implementation, the first pressure sensing module and the first voltage dividing module are located on the same side of the support layer.

[0236] In this way, the pressure sensing module and the voltage dividing module are distributed in a plane, which can reduce the thickness of the pressure sensing unit and is beneficial to the thinning of the electronic device. In addition, if the resistance value of the first voltage dividing module can change with the pressure received, it can also increase the pressure sensing area of the pressure sensing unit, improve the accuracy of the pressure sensing circuit for confirming the touch operation position, and improve the sensing effect of the pressure sensing circuit.

[0237] In a possible implementation, the control unit includes: a first switch module and a first detection module; the first detection module is configured to detect the output voltages of the pressure sensing units in the selected row; the first switch module includes M first output terminals, a first input terminal, and a second input terminal, the M first output terminals are respectively and correspondingly connected to the first ends of the M rows of pressure sensing units, the first input terminal is configured to connect to a first voltage, the second input terminal is configured to connect to a second voltage, and the first voltage is different from the second voltage; when the second end of the first voltage dividing module is connected to the first voltage, the first switch module is configured to control the M first output terminals to be alternately connected to the second input terminal to implement row-by-row selection of the pressure sensing units; or, when the second end of the first voltage dividing module is connected to the second voltage, the first switch module is configured to control the M first output terminals to be alternately connected to the first input terminal to implement row-by-row selection of the pressure sensing units.

[0238] The first switch module may correspond to the switch module formed by switch 221 in the foregoing text, the M first output terminals may correspond to the output terminals 2a of the M switches 221, the first input terminal may correspond to the input terminal 2b of the switch 221, and the second input terminal may correspond to the input terminal 2c of the switch 221.

[0239] The first switch module may also be replaced with other structures. Specifically, reference may be made to the structure description of the replacement of switch 221 in the foregoing text, which will not be elaborated here. The first detection module may correspond to the detection module formed by ADC 222 in the foregoing text. The first detection module may also be replaced with other structures. Specifically, reference may be made to the structure description of the replacement of ADC 222 in the foregoing text, which will not be elaborated here.

[0240] In this way, the control unit realizes the selection of a row of pressure sensing units by controlling the voltage change of multiple first output terminals. The control method is simple and easy to implement.

[0241] In a possible implementation, the second ends of the first pressure sensing modules in any column are commonly connected; the first detection module includes: N analog-to-digital converters; the N analog-to-digital converters are respectively and correspondingly connected to the second ends of the N columns of first pressure sensing modules; the N analog-to-digital converters are configured to detect the output voltages of the pressure sensing units in the selected row.

[0242] The analog-to-digital converter may correspond to ADC 222 in the foregoing text.

[0243] In this way, each column of pressure sensing units shares one analog-to-digital converter for detection, which can reduce the number of analog-to-digital converters used, reduce the cost and occupied area of the pressure sensing circuit. In addition, the analog-to-digital converter detects the output voltage, and the method is simple and easy to implement. In addition, the second ends of the first pressure sensing modules in any column are commonly connected, and the third ends of a column of pressure sensing units may share the same trace connection, reducing the traces of the pressure sensing circuit, and the trace layout is simple.

[0244] In a possible implementation, the pressure sensing unit is located on one side of the display screen to detect the pressure applied by the user on the other side of the display screen. In this way, by arranging the pressure sensing unit at the display screen, the recognition of the touch operation of the display screen can be achieved.

[0245] In the second possible implementation, any one of the pressure sensing units 1001 includes a first end and a second end. The first ends of any row of pressure sensing units 1001 are commonly connected, and the second ends of any column of pressure sensing units 1001 are commonly connected. The control unit 1002 is configured to select the pressure sensing units 1001 row by row and obtain the output voltages of the pressure sensing units 1001 in the selected row, or select the pressure sensing units 1001 one by one and obtain the output voltages of the selected pressure sensing units 1001. Wherein, the output voltage of the pressure sensing unit 1001 changes with the change of the pressure received by the pressure sensing unit 1001.

[0246] In the embodiments of the present application, the pressure sensing unit 1001 may correspond to the pressure sensing unit 501 in the above text, and the control unit 1002 may correspond to the control unit 502. The control unit 1002 is configured to select the pressure sensing units row by row and obtain the output voltages of the pressure sensing units in the selected row. The output voltage of the pressure sensing unit 1001 changes with the change of the pressure received by the pressure sensing unit 1001.

[0247] Alternatively, the pressure sensing unit 1001 may correspond to the pressure sensing unit 701 in the above text, and the control unit 1002 may correspond to the control unit 702. The control unit 1002 is configured to select the pressure sensing units 1001 one by one and obtain the output voltages of the selected pressure sensing units 1001. The output voltage of the pressure sensing unit 1001 changes with the change of the pressure received by the pressure sensing unit 1001.

[0248] In this way, a plurality of rows and columns of pressure sensing units are arranged. By detecting the output voltages of the pressure sensing units and analyzing the output voltages of all the pressure sensing units to confirm the pressure sensing units under pressure, the recognition of the touch operation can be realized according to the corresponding positions of the pressure sensing units. In addition, the first ends of a row of pressure sensing units 1001 are commonly connected, and the first ends of a row of pressure sensing units 1001 can share the same wiring connection. The second ends of a column of pressure sensing units 1001 are commonly connected, and the second ends of a column of pressure sensing units 1001 can share the same wiring connection, reducing the wiring of the pressure sensing circuit and simplifying the wiring layout.

[0249] In a possible implementation, the pressure sensing circuit further includes: a second voltage dividing module; any one of the pressure sensing units includes: a second pressure sensing module; the control unit includes: a second switch module and a second detection module; the second detection module is configured to detect the output voltage of the selected pressure sensing unit; the second switch module includes M first output terminals, N second output terminals, a first input terminal, a second input terminal, a third input terminal, and a fourth input terminal. The M first output terminals are respectively connected to the first ends of the M rows of pressure sensing units one by one, and the N second output terminals are respectively connected to the second ends of the N columns of pressure sensing units one by one. The first input terminal is used to connect to a first voltage, and the second input terminal is used to connect to a second voltage; the first voltage is different from the second voltage; the second switch module is configured to control the M first output terminals to be connected to the first input terminal in turn, and control the N second output terminals to be connected to the third input terminal to select the pressure sensing units one by one.

[0250] Wherein, the third input terminal is connected to one end of the second voltage dividing module, the other end of the second voltage dividing module is connected to the first voltage, and the fourth input terminal is used to connect to the second voltage; the second switch module is configured to control the M first output terminals to be connected to the second input terminal in turn, and the N second output terminals to be connected to the fourth input terminal in turn to select the pressure sensing units one by one; or, the third input terminal is used to connect to the first voltage, the fourth input terminal is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to the second voltage; the second switch module is configured to control the M first output terminals to be connected to the first input terminal in turn, and the N second output terminals to be connected to the third input terminal in turn to select the pressure sensing units one by one.

[0251] The second switch module can correspond to the switch module composed of switch one 721 and switch two 722 in the above text. The M first output terminals can correspond to the output terminals 7a of the M switch ones 721, the first input terminal can correspond to the input terminal 7b of switch one 721, and the second input terminal can correspond to the input terminal 7c of switch one 721. The N second output terminals can correspond to the output terminals 8a of the N switch twos 722, the third input terminal can correspond to the input terminal 8b of switch two 722, and the fourth input terminal can correspond to the input terminal 8c of switch two 722. Specifically, reference can be made to the above Figure 7 and Figure 8 .

[0252] The second switch module can also be replaced with other structures. Specifically, reference can be made to the description of the replaceable structures of switch one 721 and switch two 722 in the above text, which will not be elaborated here. The second detection module can correspond to the detection module composed of ADC 723 in the above text. The second detection module can also be replaced with other structures. Specifically, reference can be made to the description of the replaced structure of ADC 723 in the above text, which will not be elaborated here.

[0253] Multiple pressure sensing units share a voltage dividing module, which can reduce the number of voltage dividing modules in the pressure sensing circuit, lower the cost and occupied area of the pressure sensing circuit. In this way, the electronic device can distribute more pressure sensing units, improve the distribution density of the pressure sensing units in the electronic device, and enhance the accuracy of touch operation recognition.

[0254] In a possible implementation manner, the second pressure sensing module includes: at least one piezoresistor, and the resistance value of the piezoresistor changes with the change of the applied pressure.

[0255] The second pressure sensing module can correspond to the pressure sensing module in the pressure sensing unit 701 in the above text.

[0256] In this way, the change of the output voltage is realized through the piezoresistor, and the principle is simple and easy to implement.

[0257] In a possible implementation manner, the second switch module includes: M first switches and N second switches; any one of the first switches includes: an output terminal and two input terminals; the output terminals of the M first switches are respectively and correspondingly connected to the first ends of the M rows of pressure sensing units; one input terminal of the M first switches is connected to a first voltage, and the other input terminal of the M first switches is connected to a second voltage; any one of the second switches includes: an output terminal and two input terminals; the output terminals of the N second switches are respectively and correspondingly connected to the second ends of the N columns of pressure sensing units; one input terminal of the N second switches is connected to a first voltage, and the other input terminal of the N second switches is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to a second voltage; or, one input terminal of the N second switches is connected to a second voltage, and the other input terminal of the N second switches is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to a first voltage.

[0258] The first switch can correspond to the switch one 721 in the above text, the second switch can correspond to the switch two 722 in the above text, and the second voltage dividing module can correspond to the voltage dividing module 705 in the above text.

[0259] In this way, the control unit realizes the selection of each pressure sensing unit one by one by controlling the voltage changes of multiple first output terminals and second output terminals. The control method is simple and easy to implement.

[0260] In a possible implementation manner, the control unit further includes: a matrix controller; the matrix controller is used to control the switching connection of the M first output terminals and the N second output terminals to realize the selection of each pressure sensing unit one by one.

[0261] In this way, the selection of each pressure sensing unit one by one can be realized.

[0262] In a possible implementation, the pressure sensing circuit includes: a second voltage dividing module; the second detection module includes: an analog-to-digital converter; the analog-to-digital converter is connected to one end of the second voltage dividing module; the analog-to-digital converter is used to detect the output voltages of the pressure sensing units in the selected row.

[0263] The first switch may correspond to switch one 721 in the above text, the second switch may correspond to switch two 722 in the above text, and the second voltage dividing module may correspond to voltage dividing module 705 in the above text.

[0264] In this way, multiple pressure sensing units share one second voltage dividing module, and multiple pressure sensing units share one analog-to-digital converter to detect the output voltages. The small number of voltage dividing modules and analog-to-digital converters in the pressure sensing circuit results in low cost and small occupied area of the pressure sensing circuit. In addition, the analog-to-digital converter detects the output voltage, with a simple method and easy to implement.

[0265] In a possible implementation, the pressure sensing circuit includes: N second voltage dividing modules, and the switch unit includes: N third input terminals or N fourth input terminals; one end of the N second voltage dividing modules is connected to the N third input terminals in one-to-one correspondence, or one end of the N second voltage dividing modules is connected to the N fourth input terminals in one-to-one correspondence; the second detection module includes: N analog-to-digital converters; the N analog-to-digital converters are connected to the N second voltage dividing modules in one-to-one correspondence; the N analog-to-digital converters are used to detect the output voltages of the selected pressure sensing units.

[0266] It can be understood that each third input terminal corresponds to an ADC respectively. Alternatively, each fourth input terminal corresponds to an ADC respectively.

[0267] In this way, each column of pressure sensing units shares one second voltage dividing module, and each column of pressure sensing units shares one analog-to-digital converter to detect the output voltages. The small number of voltage dividing modules and analog-to-digital converters in the pressure sensing circuit results in low cost and small occupied area of the pressure sensing circuit. In addition, the analog-to-digital converter detects the output voltage, with a simple method and easy to implement.

[0268] In a possible implementation, the pressure sensing circuit further includes: N third voltage dividing modules; any one pressure sensing unit includes: a third pressure sensing module; the first ends of the N third voltage dividing modules are connected to the second ends of N columns of pressure sensing units; the second end of the voltage dividing module is connected to a first voltage or a second voltage; the control unit includes: a third switch module and a third detection module; the third detection module is used to obtain the output voltages of the pressure sensing units in the selected row; the third switch module includes M first output terminals, a first input terminal, and a second input terminal, the M first output terminals are connected to the first ends of M rows of pressure sensing units in one-to-one correspondence, the first input terminal is used to connect to the first voltage, and the second input terminal is used to connect to the second voltage; the first voltage is different from the second voltage.

[0269] When a first voltage is applied to the second end of the third voltage dividing module, the third switching module is configured to control the M first output ends to be connected to the second input end in turn, so as to select the pressure sensing units row by row; or, when a second voltage is applied to the second end of the third voltage dividing module, the third switching module is configured to control the M first output ends to be connected to the first input end in turn, so as to select the pressure sensing units row by row.

[0270] The third voltage dividing module may correspond to the voltage dividing module 505 above, and the third pressure sensing module may correspond to the pressure sensing module of the pressure sensing unit 505 above. The third switching module may correspond to the switching module composed of the switch one 521 above. The M first output ends may correspond to the output ends 4a of the M switch ones 521, the first input end may correspond to the input end 4b of the switch one 521, and the second input end may correspond to the input end 4c of the switch one 521. Specifically, reference may be made to the above Figure 5 。

[0271] Multiple pressure sensing units share a voltage dividing module, which can reduce the number of voltage dividing modules in the pressure sensing circuit, reduce the cost and occupied area of the pressure sensing circuit. In this way, more pressure sensing units can be distributed in the electronic device, improving the distribution density of the pressure sensing units in the electronic device and the accuracy of touch operation recognition. In addition, the first ends of a row of pressure sensing units 1001 are commonly connected, and the first ends of a row of pressure sensing units 1001 can share the same trace connection. The second ends of a column of pressure sensing units 1001 are commonly connected, and the second ends of a column of pressure sensing units 1001 can share the same trace connection, reducing the traces of the pressure sensing circuit and simplifying the trace layout.

[0272] In a possible implementation manner, the third pressure sensing module includes: at least one piezoresistor, and the resistance value of the piezoresistor changes with the applied pressure.

[0273] In this way, the change of the output voltage is realized through the piezoresistor, and the principle is simple and easy to implement.

[0274] In a possible implementation manner, the pressure sensing unit is located on one side of the display screen to detect the pressure of the user on the other side of the display screen. In this way, the pressure sensing unit is arranged at the display screen, and the recognition of the touch operation of the display screen can be realized.

[0275] Based on the above embodiments, the control unit 1002 may process the output voltage of the pressure sensing unit to recognize the touch operation. The control unit 1002 may also transmit the output voltage of each pressure sensing unit to the processor 1003; the processor 1003 recognizes the touch operation according to the output voltage of the pressure sensing unit.

[0276] It should be noted that the module names involved in the embodiments of the present application can all be defined as other names, as long as the functions of each module can be realized, and no specific restrictions are imposed on the module names.

[0277] The embodiments of the present application provide a circuit board, which includes: the pressure sensing unit described above. The circuit board can be an FPC or any type of circuit board, and no specific limitation is made here.

[0278] The following combines Figure 11 and Figure 12 to Figure 10 describe the control method of the pressure sensing circuit shown.

[0279] Exemplarily, Figure 11 is a schematic flowchart of a control method provided by the embodiments of the present application. As Figure 11 shown, the method includes: S1101. The control unit selects the pressure sensing units row by row.

[0280] Specific reference can be made to the corresponding description above, and details will not be repeated here.

[0281] S1102. The control unit obtains the output voltages of the pressure sensing units in the selected row and transmits the output voltages of the pressure sensing units to the processor.

[0282] The control unit can transmit the output voltages of the pressure sensing units to the processor in the form of a table or any form. Specific reference can be made to the corresponding description above, and details will not be repeated here.

[0283] S1103. The processor identifies the touch operation according to the output voltages of the pressure sensing units.

[0284] In some embodiments, the processor can confirm the pressure sensing units under pressure by comparing the output voltages of the pressure sensing units with preset values, thereby realizing the identification of touch operations. Specific reference can be made to the above description, and details will not be repeated here.

[0285] In other embodiments, the processor can confirm whether the pressure sensing units sense pressure by comparing the output voltages of multiple pressure sensing units, thereby realizing the identification of touch operations. Specific reference can be made to the above description, and details will not be repeated here.

[0286] In this way, the output voltages of all the pressure sensing units are detected and analyzed to confirm the pressure sensing units under pressure, and then the identification of touch operations is realized according to the positions corresponding to the pressure sensing units.

[0287] In a possible implementation, the control unit selects the pressure sensing units row by row, including: when a second voltage is applied to the second terminal of the first voltage dividing module, the control unit controls the M first output terminals to be connected to the second input terminal in turn to implement row-by-row selection of the pressure sensing units; or, when a second voltage is applied to the second terminal of the first voltage dividing module, the control unit controls the M first output terminals to be connected to the first input terminal in turn to implement row-by-row selection of the pressure sensing units.

[0288] The first voltage dividing module and the control unit can refer to the corresponding descriptions above and will not be elaborated here.

[0289] Exemplarily, Figure 12 is a schematic flowchart of a control method provided by an embodiment of the present application. As Figure 12 shown, the method includes:

[0290] S1201. The control unit selects the pressure sensing units one by one.

[0291] Specifically, it can refer to the corresponding descriptions above and will not be elaborated here.

[0292] S1202. The control unit obtains the output voltage of the selected pressure sensing unit and transmits the output voltage of the pressure sensing unit to the processor.

[0293] The control unit can transmit the output voltage of the pressure sensing unit to the processor in the form of a table or any form. Specifically, it can refer to the corresponding descriptions above and will not be elaborated here.

[0294] S1203. The processor identifies the touch operation according to the output voltage of the pressure sensing unit.

[0295] Specifically, it can refer to S1103 and will not be elaborated here.

[0296] In this way, the output voltages of the pressure sensing units are detected, and the output voltages of all the pressure sensing units are analyzed to confirm the pressure sensing units under pressure, and then the touch operation is identified according to the positions corresponding to the pressure sensing units.

[0297] In a possible implementation, the control unit selects the pressure sensing units one by one, including: when a first voltage is applied to the second terminal of the first voltage dividing module, the control unit controls the M first output terminals to be connected to the second input terminal in turn, and the N second output terminals to be connected to the fourth input terminal in turn to implement one-by-one selection of the pressure sensing units; or, when a second voltage is applied to the second terminal of the first voltage dividing module, the control unit controls the M first output terminals to be connected to the first input terminal in turn, and the N second output terminals to be connected to the third input terminal in turn to implement one-by-one selection of the pressure sensing units.

[0298] The second voltage dividing module and the control unit can refer to the corresponding descriptions above and will not be elaborated here.

[0299] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the embodiments of this application are all information and data that have been authorized by the user or fully authorized by all parties. Moreover, the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or reject.

[0300] The control method of the embodiments of this application has been described above. Next, the device for executing the above method provided by the embodiments of this application will be described. Those skilled in the art can understand that the method and the device can be combined and cited with each other. The relevant device provided by the embodiments of this application can execute the steps in the above method.

[0301] The control method provided by the embodiments of this application can be applied to an electronic device with a touch function. The electronic device includes a terminal device. The specific device form of the terminal device and the like can refer to the above relevant description and will not be elaborated here.

[0302] The embodiments of this application provide a terminal device, which includes: a processor and a memory; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory, so that the terminal device executes the above method.

[0303] The embodiments of this application provide a chip. The chip includes a processor, and the processor is used to call a computer program in the memory to execute the technical solutions in the above embodiments. Its implementation principle and technical effects are similar to those of the above relevant embodiments and will not be elaborated here.

[0304] The embodiments of this application also provide a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the above method is implemented. The methods described in the above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the functions can be stored as one or more instructions or codes on a computer-readable medium or transmitted on a computer-readable medium. The computer-readable medium can include a computer storage medium and a communication medium, and can also include any medium that can transfer a computer program from one place to another. The storage medium can be any target medium accessible by a computer.

[0305] In one possible implementation, the computer-readable medium may include RAM, ROM, compact disc read-only memory (CD-ROM), or other optical disc storage, magnetic disk storage, or any other medium targeted to carry or store the required program code in the form of instructions or data structures and accessible by a computer. Moreover, any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of the medium. As used herein, disk and optical disc include optical disc, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically, while optical discs utilize lasers to optically reproduce data. Combinations of the above should also be included within the scope of computer-readable media.

[0306] An embodiment of the present application provides a computer program product, which includes a computer program. When the computer program is run, it causes the computer to execute the above method.

[0307] Embodiments of the present application are described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processing unit of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable devices to generate a machine, such that the instructions executed by the processing unit of the computer or other programmable data processing device generate a means for implementing the functions specified in Figure One one process or multiple processes and / or blocks Figure One one block or multiple blocks.

[0308] The above specific implementation manners further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure sensing circuit, characterized in that, Comprising: A control unit and an M-row * N-column pressure sensing unit; The resistance value of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit; Any one of the pressure sensing units includes a first end and a second end. The first ends of the pressure sensing units in any one row are commonly connected, and the second ends of the pressure sensing units in any one row are commonly connected; the control unit is configured to select the pressure sensing units row by row and obtain the output voltages of the pressure sensing units in the selected row; Wherein, the output voltage of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit.

2. The circuit according to claim 1, wherein Any one of the pressure sensing units includes: a first pressure sensing module and a first voltage dividing module; the first end of the first pressure sensing module is the first end of the pressure sensing unit, the second end of the first pressure sensing module is connected to the first end of the first voltage dividing module, and the second end of the first voltage dividing module is the second end of the pressure sensing unit; The resistance value of the first pressure sensing module changes with the change of the received pressure; The first voltage dividing module and the first pressure sensing module are used to divide the voltage across the pressure sensing unit, so that the output voltage of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit.

3. The circuit according to claim 2, wherein The first pressure sensing module includes: at least one pressure-variable resistor, and the resistance value of the pressure-variable resistor changes with the change of the received pressure.

4. The circuit according to claim 3, wherein The resistance value of the first voltage dividing module changes with the change of the received pressure.

5. The circuit according to any one of claims 2-4, characterized in that, The pressure sensing unit further includes: a support layer, and the support layer is used to provide a deformation space for the pressure sensing module, so that the pressure sensing module changes with the change of the pressure received by the pressure sensing module.

6. The circuit according to claim 5, wherein The first pressure sensing module is located on one side of the support layer, and the first voltage dividing module is located on the other side of the support layer; Or, the first pressure sensing module and the first voltage dividing module are located on the same side of the support layer.

7. The circuit according to any one of claims 2-6, wherein The control unit includes: a first switch module and a first detection module; the first detection module is used to detect the output voltages of the pressure sensing units in the selected row; The first switch module includes M first output terminals, a first input terminal and a second input terminal. The M first output terminals are respectively connected to the first ends of the M rows of pressure sensing units. The first input terminal is used to access a first voltage, and the second input terminal is used to access a second voltage. The first voltage is different from the second voltage; When the first voltage is connected to the second end of the first voltage dividing module, the first switch module is used to control the M first output terminals to be connected to the second input terminal in turn to realize row-by-row selection of the pressure sensing units; Or, when the second voltage is connected to the second end of the first voltage dividing module, the first switch module is used to control the M first output terminals to be connected to the first input terminal in turn to realize row-by-row selection of the pressure sensing units.

8. The circuit according to claim 7, wherein The second ends of the first pressure sensing modules in any one column are commonly connected; The first detection module includes: N analog-to-digital converters; the N analog-to-digital converters are respectively and correspondingly connected to the second ends of N columns of the first pressure sensing module; The N analog-to-digital converters are used to detect the output voltages of the pressure sensing units in the selected row.

9. A pressure sensing circuit, characterized in that, Including: A control unit and M rows * N columns of pressure sensing units; the resistance value of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit; Any one of the pressure sensing units includes a first end and a second end, the first ends of the pressure sensing units in any one row are commonly connected, and the second ends of the pressure sensing units in any one column are commonly connected; The control unit is configured to select the pressure sensing units row by row and obtain the output voltages of the pressure sensing units in the selected row, or select the pressure sensing units one by one and obtain the output voltages of the selected pressure sensing units; wherein, the output voltage of the pressure sensing unit changes with the change of the pressure received by the pressure sensing unit.

10. The circuit according to claim 9, wherein The pressure sensing circuit further includes: a second voltage dividing module; any one of the pressure sensing units includes: a second pressure sensing module; The control unit includes: a second switch module and a second detection module; the second detection module is used to detect the output voltage of the selected pressure sensing unit; The second switch module includes M first output terminals, N second output terminals, a first input terminal, a second input terminal, a third input terminal and a fourth input terminal, the M first output terminals are respectively and correspondingly connected to the first ends of M rows of the pressure sensing units, the N second output terminals are respectively and correspondingly connected to the second ends of the N columns of pressure sensing units, the first input terminal is used to access a first voltage, and the second input terminal is used to access a second voltage; the first voltage is different from the second voltage; The second switch module is configured to control the M first output terminals to be connected to the first input terminal in turn, and control the N second output terminals to be connected to the third input terminal to realize selecting the pressure sensing units one by one; Wherein, the third input terminal is connected to one end of the second voltage dividing module, the other end of the second voltage dividing module accesses the first voltage, and the fourth input terminal is used to access the second voltage; the second switch module is configured to control the M first output terminals to be connected to the second input terminal in turn, and the N second output terminals to be connected to the fourth input terminal in turn to realize selecting the pressure sensing units one by one; Or, the third input terminal is used to access the first voltage, the fourth input terminal is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module accesses the second voltage; the second switch module is configured to control the M first output terminals to be connected to the first input terminal in turn, and the N second output terminals to be connected to the third input terminal in turn to realize selecting the pressure sensing units one by one.

11. The circuit according to claim 10, wherein The second pressure sensing module includes: at least one pressure-variable resistor, and the resistance value of the pressure-variable resistor changes with the change of the received pressure.

12. The circuit according to claim 10 or 11, characterized in that, The second switch module includes: M first switches and N second switches; Any one of the first switches includes: an output terminal and two input terminals; the output terminals of the M first switches are respectively connected to the first ends of the M rows of pressure sensing units in one-to-one correspondence; one input terminal of the M first switches is connected to a first voltage, and the other input terminal of the M first switches is connected to a second voltage; Any one of the second switches includes: an output terminal and two input terminals; the output terminals of the N second switches are respectively connected to the second ends of the N columns of pressure sensing units in one-to-one correspondence; One input terminal of the N second switches is connected to the first voltage, the other input terminal of the N second switches is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to the second voltage; Alternatively, one input terminal of the N second switches is connected to the second voltage, the other input terminal of the N second switches is connected to one end of the second voltage dividing module, and the other end of the second voltage dividing module is connected to the first voltage.

13. The circuit according to any one of claims 10-12, characterized in that, The control unit further includes: a matrix controller; The matrix controller is configured to control the switching connection of the M first output terminals and the N second output terminals to sequentially select the pressure sensing units one by one.

14. The circuit according to any one of claims 10-13, characterized in that, The pressure sensing circuit includes: one second voltage dividing module; the second detection module includes: an analog-to-digital converter; the analog-to-digital converter is connected to one end of the second voltage dividing module; the analog-to-digital converter is configured to detect the output voltages of the pressure sensing units in the selected row; Alternatively, the pressure sensing circuit includes: N second voltage dividing modules, the switching unit includes: N third input terminals or N fourth input terminals; one end of the N second voltage dividing modules is respectively connected to the N third input terminals in one-to-one correspondence, or one end of the N second voltage dividing modules is respectively connected to the N fourth input terminals in one-to-one correspondence; the second detection module includes: N analog-to-digital converters; the N analog-to-digital converters are respectively connected to the second ends of N columns of the second pressure sensing modules in one-to-one correspondence; the N analog-to-digital converters are configured to detect the output voltages of the pressure sensing units in the selected row.

15. The circuit according to claim 9, wherein The pressure sensing circuit further includes: N third voltage dividing modules; any one of the pressure sensing units includes: a third pressure sensing module; the first ends of the N third voltage dividing modules are connected to the second ends of the N columns of pressure sensing units; the second ends of the third voltage dividing modules are connected to the first voltage or the second voltage; The control unit includes: a third switching module and a third detection module; the third detection module is configured to obtain the output voltages of the pressure sensing units in the selected row; The third switching module includes M first output terminals, a first input terminal, and a second input terminal. The M first output terminals are respectively connected to the first ends of the M rows of pressure sensing units in one-to-one correspondence. The first input terminal is configured to be connected to a first voltage, and the second input terminal is configured to be connected to a second voltage; the first voltage is different from the second voltage; When the second end of the third voltage dividing module is connected to the first voltage, the third switching module is configured to control the M first output terminals to be alternately connected to the second input terminal to sequentially select the pressure sensing units row by row; Alternatively, when the second voltage is applied to the second end of the third voltage dividing module, the third switching module is configured to control the M first output ends to be connected to the first input end in turn, so as to select the pressure sensing units row by row.

16. The circuit according to claim 15, wherein the third pressure sensing module includes: at least one piezoresistor, and the resistance value of the piezoresistor changes with the applied pressure.

17. The circuit according to any one of claims 1-16, wherein the pressure sensing units are located on one side of the display screen to detect the pressure applied by the user on the other side of the display screen.

18. A circuit board, characterized in that, Comprising: the pressure sensing units in the pressure sensing circuit according to any one of claims 1-17.

19. A chip, characterized in that, Comprising: the control unit in the pressure sensing circuit according to any one of claims 1-17.

20. An electronic device, characterized in that, Comprising: the pressure sensing units in the pressure sensing circuit according to any one of claims 1-17, and the control unit in the pressure sensing circuit according to any one of claims 1-17.

21. A control method, characterized in that, Applied to the pressure sensing circuit according to any one of claims 1-8, 15-16, the method includes: The control unit selects the pressure sensing units row by row; The control unit obtains the output voltages of the pressure sensing units in the selected row and transmits the output voltages of the pressure sensing units to the processor; The processor identifies the touch operation according to the output voltages of the pressure sensing units.

22. The method according to claim 21, wherein The control unit selects the pressure sensing units row by row, including: When the second voltage is applied to the second end of the first voltage dividing module, the control unit controls the M first output ends to be connected to the second input end in turn, so as to select the pressure sensing units row by row; Alternatively, when the second voltage is applied to the second end of the first voltage dividing module, the control unit controls the M first output ends to be connected to the first input end in turn, so as to select the pressure sensing units row by row.

23. A control method, characterized in that, Applied to the pressure sensing circuit according to any one of claims 9-14, the method includes: The control unit selects the pressure sensing units one by one; The control unit obtains the output voltage of the selected pressure sensing unit and transmits the output voltage of the pressure sensing unit to the processor; The processor identifies the touch operation according to the output voltage of the pressure sensing unit.

24. The method according to claim 23, wherein The control unit selects the pressure sensing units one by one, including: When the first voltage is applied to the second end of the second voltage dividing module, the control unit controls the M first output ends to be connected to the second input end in turn, and the N second output ends to be connected to the fourth input end in turn, so as to select the pressure sensing units one by one; Alternatively, when the second voltage is applied to the second end of the second voltage dividing module, the control unit controls the M first output ends to be connected to the first input end in turn, and the N second output ends to be connected to the third input end in turn, so as to select the pressure sensing units one by one.

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