Pressure sensor module, pressure detection device and method

Abstract

The present application provides a pressure sensor module, a pressure detection device and a method, wherein the pressure sensor module comprises: a panel, a first full-bridge circuit and a second full-bridge circuit. The first full-bridge circuit is arranged on the panel. The four bridge arms of the first full-bridge circuit are all strain resistors. The second full-bridge circuit is arranged on the panel. The second full-bridge circuit comprises a first bridge arm and a second bridge arm. The first bridge arm is not connected to the second bridge arm, and the first bridge arm and the second bridge arm are both non-strain resistors. The output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used to connect to a pressure signal detection circuit. When the panel is under pressure, the present application can correctly identify forward and lateral pressure signals through the cooperation of the first full-bridge circuit and the second full-bridge circuit, avoid misidentification, and thereby improve the reliability of identification.

Description

Technical Field

[0001] The present application relates to the technical field of pressure sensing buttons, and in particular to a pressure sensor module, a pressure detection device and a method. Background Art

[0002] Pressure-sensing buttons are new buttons based on pressure-sensing technology. They use pressure-sensing structures instead of mechanical button structures, and can convert the force applied to the pressure-sensing panel into control signals, thereby realizing corresponding control functions. Compared with mechanical buttons, pressure-sensing buttons have the advantages of high sensitivity, long service life, and small footprint. They can replace the original mechanical buttons in many fields and provide richer human-computer interaction methods for many input devices.

[0003] At present, pressure-sensitive buttons are widely used in electronic devices. The principle of implementing pressure-sensitive buttons on electronic devices is to attach the sensor to the inner wall of the middle frame, sense the deformation of the frame, and convert it into an electrical signal. It is recognized as a button through a certain algorithm. However, the deformation of the frame does not only occur when the frame is pressed, but the middle frame will also deform when the electronic device is twisted. However, existing pressure-sensitive buttons cannot correctly identify forward and lateral press signals, and there is a problem of misidentification. Summary of the invention

[0004] Based on this, it is necessary to provide a pressure sensor module, a pressure detection device and a method to address the problem that existing pressure sensing buttons cannot correctly identify forward and lateral pressure signals and have misidentification problems.

[0005] A pressure sensor module, comprising:

[0006] panel;

[0007] A first full-bridge circuit is arranged on the panel, wherein four bridge arms of the first full-bridge circuit are strain resistors; and

[0008] A second full-bridge circuit is arranged on the panel, the second full-bridge circuit comprises a first bridge arm and a second bridge arm, the first bridge arm is not connected to the second bridge arm, and the first bridge arm and the second bridge arm are both non-strain resistors;

[0009] The output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used to connect to a pressure signal detection circuit.

[0010] In one embodiment, the second full-bridge circuit further includes: a third bridge arm and a fourth bridge arm;

[0011] The third bridge arm is not connected to the fourth bridge arm, and both the third bridge arm and the fourth bridge arm are strain resistors.

[0012] In one embodiment, the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are located in the same plane.

[0013] In one embodiment, the first bridge arm and the second bridge arm are located on one side of the panel, the third bridge arm and the fourth bridge arm are located on the other side of the panel, and the two bridge arms of the first full-bridge circuit are located on one side of the panel, and the other two bridge arms of the first full-bridge circuit are located on the other side of the panel.

[0014] In one embodiment, the first end of the first bridge arm and the first end of the fourth bridge arm are both used to electrically connect to a preset positive reference voltage source, the second end of the first bridge arm is electrically connected to the first end of the third bridge arm, the second end of the fourth bridge arm is electrically connected to the first end of the second bridge arm, and the second end of the third bridge arm and the second end of the second bridge arm are both used to electrically connect to a preset negative reference voltage source.

[0015] A pressure detection device, comprising the pressure sensor module according to any one of the above embodiments, wherein the first full-bridge circuit is used to sense pressure and generate a first differential input signal, and the second full-bridge circuit is used to sense the pressure and generate a second differential input signal; and

[0016] The processor is electrically connected to the first full-bridge circuit and the second full-bridge circuit respectively, and is used to obtain the first differential input signal and the second differential input signal, and determine whether to respond to the force applied to the panel based on the first differential input signal and the second differential input signal.

[0017] In one of the embodiments, when the panel is subjected to pressure, the processor is used to determine a change amplitude of the first differential input signal based on the first differential input signal, and obtain a first change amplitude;

[0018] The processor is further configured to determine a change amplitude of the second differential input signal based on the second differential input signal, and obtain a second change amplitude;

[0019] The processor compares the first change amplitude with the second change amplitude, and determines whether to respond to the force on the panel based on the comparison result.

[0020] In one embodiment, if the first change amplitude is smaller than the second change amplitude, it is determined that the panel is being pressed by positive pressure, and the processor responds to the force on the panel.

[0021] In one embodiment, if the first change amplitude is greater than the second change amplitude, it is determined that the panel is being pressed by lateral pressure, and the processor does not respond to the force on the panel.

[0022] In one embodiment, the processor is further configured to:

[0023] When the panel is pressed by positive pressure, a touch command is output;

[0024] When the panel is pressed by lateral pressure, no touch command is output.

[0025] A pressure detection method, applied to the pressure detection device described in any one of the above embodiments, the method comprising:

[0026] Acquire the first differential input signal and the second differential input signal;

[0027] A determination is made whether to respond to a force applied to the panel based on the first differential input signal and the second differential input signal.

[0028] Compared with the prior art, the above-mentioned pressure sensor module, pressure detection device and method, when the panel is under pressure, senses the pressure through the first full-bridge circuit and generates a first differential input signal, and at the same time, cooperates through the first bridge arm and the second bridge arm (non-strain resistor) that are not connected in the second full-bridge circuit to generate a second differential input signal, and determines whether to respond to the force applied to the panel based on the first differential input signal and the second differential input signal, so that the present application can correctly identify the forward and lateral pressure signals, avoid misidentification, and thereby improve the reliability of identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a pressure sensor module provided in one embodiment of the present application;

[0030] Figure 2 A schematic diagram of the circuit structure of a first full-bridge circuit provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the circuit structure of a second full-bridge circuit provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the structure of a pressure sensor module provided in another embodiment of the present application;

[0033] Figure 5 A circuit principle block diagram of a pressure detection device provided in one embodiment of the present application;

[0034] Figure 6 This is a flow chart of a pressure button recognition method provided in one embodiment of the present application.

[0035] 10 Pressure sensor module

[0036] 100 Panels

[0037] 110 First Surface

[0038] 120 Second Surface

[0039] 20. Pressure detection device

[0040] 21 Processor

[0041] 200 First full bridge circuit

[0042] 300 Second full bridge circuit

[0043] 301 Positive reference voltage source

[0044] 302 Negative reference voltage source

[0045] 310 First bridge arm

[0046] 320 Second bridge arm

[0047] 330 Third bridge arm

[0048] 340 Fourth bridge arm DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0050] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0052] See also Figures 1 to 3In one embodiment of the present application, a pressure sensor module 10 is provided, comprising: a panel 100, a first full-bridge circuit 200 and a second full-bridge circuit 300. The first full-bridge circuit 200 is arranged on the panel 100. The four bridge arms of the first full-bridge circuit 200 are all strain resistors. The second full-bridge circuit 300 is arranged on the panel 100. The second full-bridge circuit 300 includes a first bridge arm 310 and a second bridge arm 320. The first bridge arm 310 is not connected to the second bridge arm 320, and the first bridge arm 310 and the second bridge arm 320 are both non-strain resistors. The output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used to connect to the pressure signal detection circuit.

[0053] It is understood that the material of the panel 100 is not limited, as long as it can withstand the pressure applied by the implementer. In one embodiment, the panel 100 is a rigid material, such as a metal plate, a glass plate, a plastic plate, an aluminum alloy plate or other rigid materials.

[0054] It can be understood that the specific circuit structure of the first full-bridge circuit 200 is not limited, as long as it can sense the pressure and generate the first differential input signal. In one embodiment, the first full-bridge circuit 200 includes four bridge arms, and each bridge arm is a strain resistor. In one embodiment, the four bridge arms can be located in the same plane.

[0055] It can be understood that the manner in which the first full-bridge circuit 200 is disposed on the panel 100 is not limited, as long as the first full-bridge circuit 200 is fixed to the panel 100. In one embodiment, the first full-bridge circuit 200 can be pasted on the panel 100. In one embodiment, the first full-bridge circuit 200 can also be embedded in the panel 100.

[0056] It can be understood that the second full-bridge circuit 300 is arranged on the panel 100 in any manner, as long as the second full-bridge circuit 300 is fixed to the panel 100. In one embodiment, the second full-bridge circuit 300 can be pasted on the panel 100. In one embodiment, the second full-bridge circuit 300 can also be embedded in the panel 100.

[0057] In one embodiment, the second full-bridge circuit 300 may include a first bridge arm 310 and a second bridge arm 320, and both the first bridge arm 310 and the second bridge arm 320 are non-strain resistors. At the same time, the first bridge arm 310 and the second bridge arm 320 are not connected. That is, there is no electrical connection between the first bridge arm 310 and the second bridge arm 320. In one embodiment, both the first bridge arm 310 and the second bridge arm 320 are non-strain resistors, which means that both the first bridge arm 310 and the second bridge arm 320 are ordinary resistors.

[0058] In one embodiment, the second full-bridge circuit 300 further includes: a third bridge arm 330 and a fourth bridge arm 340. The third bridge arm 330 is not connected to the fourth bridge arm 340. The third bridge arm 330 and the fourth bridge arm 340 are both strain resistors. In one embodiment, the third bridge arm 330 is not connected to the fourth bridge arm 340 means that the third bridge arm 330 is not electrically connected to the fourth bridge arm 340. In one embodiment, the pressure signal detection circuit can adopt a conventional signal detection circuit, such as a signal detector.

[0059] In this embodiment, when the panel 100 is under pressure, the pressure is sensed by the first full-bridge circuit 200 and a first differential input signal is generated. At the same time, the first bridge arm 310 and the second bridge arm 320 (non-strain resistor) that are not connected in the second full-bridge circuit 300 cooperate to sense the pressure and generate a second differential input signal using the second full-bridge circuit 300, and determine whether to respond to the force on the panel 100 based on the first differential input signal and the second differential input signal, so that the present embodiment can correctly identify the forward and lateral pressure signals, avoid misidentification, and thereby improve the reliability of identification.

[0060] In one embodiment, the first bridge arm 310, the second bridge arm 320, the third bridge arm 330 and the fourth bridge arm 340 are located in the same plane. That is, the first bridge arm 310, the second bridge arm 320, the third bridge arm 330 and the fourth bridge arm 340 can all be located on the first surface 110 of the panel 100. This arrangement can be used to determine whether to respond to the force on the panel 100.

[0061] See also Figure 4 In one embodiment, the first bridge arm 310 and the second bridge arm 320 are located on one side of the panel 100, the third bridge arm 330 and the fourth bridge arm 340 are located on the other side of the panel 100, and the two bridge arms of the first full-bridge circuit 200 are located on one side of the panel 100, and the other two bridge arms of the first full-bridge circuit 200 are located on the other side of the panel 100.

[0062] In one embodiment, the first bridge arm 310 and the second bridge arm 320 may be located on the first surface 110 of the panel 100, and the third bridge arm 330 and the fourth bridge arm 340 may be located on the second surface 120 of the panel 100. That is, the non-strain resistor in the second full-bridge circuit 300 is located on the first surface 110, and the strain resistor is located on the second surface 120. In one embodiment, the positional relationship between the non-strain resistor and the strain resistor can be interchanged. That is, the first bridge arm 310 and the second bridge arm 320 may be located on the second surface 120 of the panel 100, and the third bridge arm 330 and the fourth bridge arm 340 may be located on the first surface 110 of the panel 100.

[0063] In one embodiment, it can be known from the above embodiment that the first bridge arm 310 and the second bridge arm 320 are always located in the same plane, and the third bridge arm 330 and the fourth bridge arm 340 are always located in the same plane. In one embodiment, any two bridge arms of the first full-bridge circuit 200 can be located on one side of the panel 100 (i.e., the first surface 110 or the second surface 120), and the other two bridge arms of the first full-bridge circuit 200 can be located on the other side of the panel 100 (i.e., the second surface 120 or the first surface 110).

[0064] That is, any two bridge arms of the first full-bridge circuit 200 must be located in the same plane as the first bridge arm 310 and the second bridge arm 320, and the other two bridge arms of the first full-bridge circuit 200 must be located in the same plane as the third bridge arm 330 and the fourth bridge arm 340. This placement can also be used to determine whether the force on the panel 100 is responded to.

[0065] In one embodiment, the first end of the first bridge arm 310 and the first end of the fourth bridge arm 340 are both used to electrically connect to a preset positive reference voltage source 301. The second end of the first bridge arm 310 is electrically connected to the first end of the third bridge arm 330. The second end of the fourth bridge arm 340 is electrically connected to the first end of the second bridge arm 320. The second end of the third bridge arm 330 and the second end of the second bridge arm 320 are both used to electrically connect to a preset negative reference voltage source 302.

[0066] In one embodiment, the four bridge arms in the first full-bridge circuit 200 may also be connected in the above manner. In one embodiment, the negative reference voltage source 302 may be grounded or not grounded, which may be selected according to actual needs.

[0067] See also Figure 5Another embodiment of the present application provides a pressure detection device 20, comprising the pressure sensor module 10 described in any of the above embodiments and a processor 21. The first full-bridge circuit 200 is used to sense pressure and generate a first differential input signal. The second full-bridge circuit 300 is used to sense the pressure and generate a second differential input signal. The processor 21 is electrically connected to the first full-bridge circuit 200 and the second full-bridge circuit 300, respectively. The processor 21 is used to obtain the first differential input signal and the second differential input signal, and determine whether to respond to the force on the panel 100 based on the first differential input signal and the second differential input signal.

[0068] In one embodiment, the specific circuit structures of the first full-bridge circuit 200 and the second full-bridge circuit 300 may adopt the structures described in the above embodiments. In one embodiment, the first full-bridge circuit 200 (strain resistor) may sense the force (i.e., the pressure applied by the implementer) of the panel 100 and generate a first differential input signal. Similarly, the second full-bridge circuit 300 may sense the force of the panel 100 and generate a second differential input signal.

[0069] In one embodiment, the pressure signal detection circuit may be integrated in the processor 21. After acquiring the first differential input signal and the second differential input signal, the processor 21 may determine whether to respond to the force applied to the panel 100 based on the first differential input signal and the second differential input signal.

[0070] Specifically, it is assumed that the four bridge arms of the first full-bridge circuit 200 are R11, R12, R13 and R14 respectively; the resistance of the first bridge arm 310 is R24, the resistance of the second bridge arm 320 is R21, the resistance of the third bridge arm 330 is R22, and the resistance of the fourth bridge arm 340 is R23. Among them, R24 and R21 are ordinary resistors (i.e., non-strain resistors), and R11, R12, R13, R14, R22 and R23 are all strain resistors. At this time, the changes of the first differential input signal S1 and the second differential input signal S2 can be obtained by the following formula:

[0071] S1=(S1+)-(S1-)=VS*(R12 / (R12+R11)-R14 / (R13+R14));

[0072] S2=(S2+)-(S2-)=VS*(R22 / (R22+R24)-R21 / (R21+R23));

[0073] When the panel 100 is subjected to pressure from the Z axis (ie, positive force), it is assumed that the direction of the pressure is downward along the Z axis, that is, opposite to the direction of the Z axis arrow. Figure 1 For example, all the strain resistors (R11, R12, R13, R14, R22, R23) in the same plane have their resistance increased due to stretching, while the resistance of the non-strain resistors R23 and R24 remain unchanged. It can be seen from the above formula that since R11 and R12 increase in proportion, the S1+ (indicating the positive input of the first differential input signal) signal remains unchanged; R13 and R14 increase in proportion, the S1- (indicating the negative input of the first differential input signal) signal remains unchanged; that is, S1 remains unchanged. In other words, at this time, the first differential input signal does not change significantly. Since R22 increases and R24 remains unchanged, it can be seen that the S2+ (indicating the positive input of the second differential input signal) signal increases; since R23 increases and R21 remains unchanged, it can be seen that the S2- (indicating the negative input of the second differential input signal) signal decreases; that is, S2 increases. In other words, at this time, the second differential input signal changes significantly. Figure 4 For example, when the resistors are distributed in different planes, the strain resistors along the outer side of the force direction have larger resistance due to stretching, and the strain resistors along the inner side of the force direction have smaller resistance due to extrusion, while the resistance of the non-strain resistors R23 and R24 remains unchanged, which also causes the first differential signal S1 to change little and the second differential signal S2 to change significantly.

[0074] It can be known from the above logic that when the panel 100 is subjected to pressure from the Z axis, the first differential input signal does not change significantly, while the second differential input signal changes significantly. In other words, whether the panel 100 is subjected to pressure from the Z axis can be judged by whether the changes in the first differential input signal and the second differential input signal are significant, so that the processor 21 can determine whether to respond to the force applied to the panel 100. In one embodiment, when the panel 100 is subjected to pressure, if the first differential input signal does not change significantly, while the second differential input signal changes significantly, the processor 21 responds to the force applied to the panel 100.

[0075] When the panel 100 is subjected to pressure along the Y-axis arrow direction (i.e., lateral force), Figure 1 For example, the strain resistors (R12, R13 and R23) on the outside of the force direction increase their resistance due to stretching, and the strain resistors (R11, R14 and R22) on the inside of the force direction decrease their resistance due to being squeezed, while the resistance of the non-strain resistors R21 and R24 remains unchanged. At this time, the changes in the first differential input signal S1 and the second differential input signal S2 can be derived from the above formula. Specifically, as R11 decreases and R12 increases, the S1+ signal increases; R13 increases and R14 decreases, the S1- signal decreases; that is, S1 decreases significantly. In other words, at this time, the first differential input signal changes significantly. Since R22 decreases and R24 remains unchanged, it can be seen that the S2+ signal decreases; since R23 increases and R21 remains unchanged, it can be seen that the S2- signal decreases; that is, the change in S2 is not obvious.

[0076] It can be known from the above logic that when the panel 100 is subjected to pressure from the Y axis, the first differential input signal changes significantly, while the second differential input signal does not change significantly. In other words, whether the panel 100 is subjected to pressure from the Y axis can be judged by whether the changes in the first differential input signal and the second differential input signal are significant, so that the processor 21 can determine whether to respond to the force applied to the panel 100. In one embodiment, when the panel 100 is subjected to pressure, if the first differential input signal changes significantly, while the second differential input signal does not change significantly, the processor 21 does not respond to the force applied to the panel 100.

[0077] In this embodiment, when the panel 100 is under pressure, the pressure is sensed by the first full-bridge circuit 200 and a first differential input signal is generated. At the same time, the first bridge arm 310 and the second bridge arm 320 (non-strain resistor) that are not connected in the second full-bridge circuit 300 cooperate to sense the pressure and generate a second differential input signal using the second full-bridge circuit 300. The processor 21 determines whether to respond to the force on the panel 100 based on the first differential input signal and the second differential input signal. This allows the present embodiment to correctly identify forward and lateral pressure signals, avoid misidentification, and thereby improve the reliability of identification.

[0078] In one embodiment, when the panel 100 is subjected to pressure, the processor 21 is used to determine the change amplitude of the first differential input signal based on the first differential input signal, and obtain a first change amplitude. The processor 21 is also used to determine the change amplitude of the second differential input signal based on the second differential input signal, and obtain a second change amplitude. The processor 21 compares the first change amplitude with the second change amplitude, and determines whether to respond to the force on the panel 100 based on the comparison result.

[0079] In one embodiment, the processor 21 may compare the difference between the first change amplitude and the second change amplitude. If the first change amplitude is smaller than the second change amplitude, it is determined that the panel 100 is being pressed by a positive pressure, and the processor 21 may respond to the force applied to the panel 100. In one embodiment, if the first change amplitude is larger than the second change amplitude, it is determined that the panel 100 is being pressed by a lateral pressure, and the processor 21 may not respond to the force applied to the panel 100.

[0080] In one embodiment, when the panel 100 is pressed by positive pressure, that is, when the processor 21 responds to the force applied to the panel 100, the processor 21 may output a touch command. When the panel 100 is pressed by lateral pressure, that is, when the processor 21 does not respond to the force applied to the panel 100, the processor 21 does not output a touch command. Optionally, the touch command may be a key command or a non-key command.

[0081] See also Figure 6 Another embodiment of the present application provides a pressure detection method, which is applied to the pressure detection device 20 described in any of the above embodiments, and the method includes:

[0082] S102: Acquire the first differential input signal and the second differential input signal.

[0083] In one embodiment, the first differential input signal and the second differential input signal may be acquired by the processor 21. Specifically, the processor 21 may acquire the first differential input signal and the second differential input signal in the manner described in the above embodiment.

[0084] S104 : Determine whether to respond to the force applied to the panel 100 based on the first differential input signal and the second differential input signal.

[0085] In one embodiment, the processor 21 may determine whether to respond to the force applied to the panel 100 based on the first differential input signal and the second differential input signal. Specifically, the processor 21 may determine whether to respond to the force applied to the panel 100 based on the change amplitude of the first differential input signal and the change amplitude of the second differential input signal.

[0086] For example, when the change amplitude of the first differential input signal is smaller than the change amplitude of the second differential input signal, it can be determined that the panel 100 is being pressed by positive pressure, and the processor 21 can respond to the force applied to the panel 100. When the change amplitude of the first differential input signal is larger than the change amplitude of the second differential input signal, it can be determined that the panel 100 is being pressed by lateral pressure, and the processor 21 does not respond to the force applied to the panel 100.

[0087] In this embodiment, when the panel 100 is under pressure, the pressure is sensed by the first full-bridge circuit 200 and a first differential input signal is generated. At the same time, the first bridge arm 310 and the second bridge arm 320 (non-strain resistor) that are not connected in the second full-bridge circuit 300 cooperate to sense the pressure and generate a second differential input signal using the second full-bridge circuit 300. The processor 21 determines whether to respond to the force on the panel 100 based on the first differential input signal and the second differential input signal. This allows the present embodiment to correctly identify forward and lateral pressure signals, avoid misidentification, and thereby improve the reliability of identification.

[0088] In one embodiment, step S104 includes: determining the change amplitude of the first differential input signal based on the first differential input signal, and obtaining a first change amplitude; determining the change amplitude of the second differential input signal based on the second differential input signal, and obtaining a second change amplitude; comparing the first change amplitude with the second change amplitude, and determining whether to respond to the force applied to the panel 100 based on the comparison result.

[0089] In one embodiment, the step of comparing the first change amplitude with the second change amplitude, and determining whether to respond to the force applied to the panel 100 based on the comparison result includes: performing a difference comparison between the first change amplitude and the second change amplitude, and if the first change amplitude is smaller than the second change amplitude, it is determined that the panel 100 is being pressed by a positive pressure, and at this time, the processor 21 responds to the force applied to the panel 100. If the first change amplitude is larger than the second change amplitude, it is determined that the panel 100 is being pressed by a lateral pressure, and at this time, the processor 21 does not respond to the force applied to the panel 100.

[0090] In one embodiment, when the panel 100 is pressed by positive pressure, that is, when the processor 21 responds to the force applied to the panel 100, the processor 21 may output a touch command. When the panel 100 is pressed by lateral pressure, that is, when the processor 21 does not respond to the force applied to the panel 100, the processor 21 does not output a touch command. Optionally, the touch command may be a key command or a non-key command.

[0091] To summarize, when the panel 100 is under pressure, the present application senses the pressure through the first full-bridge circuit 200 and generates a first differential input signal. At the same time, the first bridge arm 310 and the second bridge arm 320 (non-strain resistor) that are not connected in the second full-bridge circuit 300 cooperate to generate a second differential input signal, and determines whether to respond to the force on the panel 100 based on the first differential input signal and the second differential input signal, so that the present application can correctly identify the forward and lateral pressure signals, avoid misidentification, and thereby improve the reliability of identification.

[0092] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A pressure sensor module, characterized in that: include: Panel (100); A first full-bridge circuit (200) is arranged on the panel (100), and the four bridge arms of the first full-bridge circuit (200) are all strain resistors; as well as A second full-bridge circuit (300) is arranged on the panel (100), the second full-bridge circuit (300) comprising a first bridge arm (310) and a second bridge arm (320), the first bridge arm (310) and the second bridge arm (320) are not connected, and the first bridge arm (310) and the second bridge arm (320) are both non-strain resistors; The output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used to connect to a pressure signal detection circuit; The second full-bridge circuit (300) further comprises: a third bridge arm (330) and a fourth bridge arm (340); The third bridge arm (330) is not connected to the fourth bridge arm (340), and both the third bridge arm (330) and the fourth bridge arm (340) are strain resistors; The first bridge arm (310) and the second bridge arm (320) are located on one side of the panel (100), the third bridge arm (330) and the fourth bridge arm (340) are located on the other side of the panel (100), and the two bridge arms of the first full-bridge circuit (200) are located on one side of the panel (100), and the other two bridge arms of the first full-bridge circuit (200) are located on the other side of the panel (100).

2. The pressure sensor module according to claim 1, characterized in that: The first bridge arm (310), the second bridge arm (320), the third bridge arm (330) and the fourth bridge arm (340) are located in the same plane.

3. The pressure sensor module according to claim 1, characterized in that: The first end of the first bridge arm (310) and the first end of the fourth bridge arm (340) are both used to electrically connect to a preset positive reference voltage source (301); the second end of the first bridge arm (310) is electrically connected to the first end of the third bridge arm (330); the second end of the fourth bridge arm (340) is electrically connected to the first end of the second bridge arm (320); and the second end of the third bridge arm (330) and the second end of the second bridge arm (320) are both used to electrically connect to a preset negative reference voltage source (302).

4. A pressure detection device, characterized in that: Comprising the pressure sensor module (10) according to any one of claims 1 to 3, the first full-bridge circuit (200) is used to sense pressure and generate a first differential input signal, and the second full-bridge circuit (300) is used to sense the pressure and generate a second differential input signal; as well as A processor (21) is electrically connected to the first full-bridge circuit (200) and the second full-bridge circuit (300), respectively, and is used to obtain the first differential input signal and the second differential input signal, and determine whether to respond to the force applied to the panel (100) based on the first differential input signal and the second differential input signal.

5. The pressure detection device according to claim 4, characterized in that: When the panel (100) is subjected to pressure, the processor (21) is used to determine the change amplitude of the first differential input signal based on the first differential input signal, and obtain a first change amplitude; The processor (21) is further used to determine the variation amplitude of the second differential input signal based on the second differential input signal, and obtain a second variation amplitude; The processor (21) compares the first change amplitude with the second change amplitude, and determines whether to respond to the force applied to the panel (100) based on the comparison result.

6. The pressure detection device according to claim 5, characterized in that: If the first change amplitude is smaller than the second change amplitude, it is determined that the panel (100) is being pressed by positive pressure, and the processor (21) responds to the force applied to the panel (100).

7. The pressure detection device according to claim 6, characterized in that: If the first change amplitude is greater than the second change amplitude, it is determined that the panel (100) is being pressed by lateral pressure, and the processor (21) does not respond to the force applied to the panel (100).

8. The pressure detection device according to claim 7, characterized in that: The processor (21) is also used for: When the panel (100) is pressed by positive pressure, a touch command is output; When the panel (100) is pressed by lateral pressure, no touch command is output.

9. A pressure detection method, characterized in that: Applied to the pressure detection device (20) as claimed in claim 4, the method comprises: Acquire the first differential input signal and the second differential input signal; Whether to respond to the force applied to the panel (100) is determined based on the first differential input signal and the second differential input signal.

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