Pressure sensor module, pressure detection device and method

Abstract

The present application provides a pressure sensor module, a pressure detection device and a method, including a panel, a first full-bridge circuit and a second full-bridge circuit. The first full-bridge circuit is arranged on the panel. At least one half-bridge of the first full-bridge circuit is a force-sensitive resistor. The first full-bridge circuit includes a first half-bridge and a second half-bridge. The first half-bridge is located on a first plane. The second half-bridge is located on a second plane parallel to the first plane. The second full-bridge circuit is arranged on the panel. The second full-bridge circuit includes a first bridge arm and a second bridge arm located on the first plane, and a third bridge arm and a fourth bridge arm located on the second plane. The first bridge arm and the third bridge arm are electrically connected to form a third half-bridge. The second bridge arm and the fourth bridge arm are electrically connected to form a fourth half-bridge. The first bridge arm and the second bridge arm, and / or the third bridge arm and the fourth bridge arm are force-sensitive resistors. The output end of the first full-bridge circuit and the output end of the second full-bridge circuit are both used to electrically connect the pressure signal detection circuit.

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 disposed on the panel, at least one half-bridge of the first full-bridge circuit is a force-sensitive resistor, the first full-bridge circuit includes a first half-bridge and a second half-bridge, the first half-bridge is located in a first plane, and the second half-bridge is located in a second plane parallel to the first plane; and

[0008] a second full-bridge circuit, arranged on the panel, the second full-bridge circuit comprising a first bridge arm and a second bridge arm located on the first plane, and a third bridge arm and a fourth bridge arm located on the second plane, the first bridge arm and the third bridge arm are electrically connected to form a third half bridge, the second bridge arm and the fourth bridge arm are electrically connected to form a fourth half bridge, the first bridge arm and the second bridge arm, and / or the third bridge arm and the fourth bridge arm are force-sensitive resistors;

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

[0010] In one embodiment, the bridge arms of the first half-bridge are all non-force-sensitive resistors, and the bridge arms of the second half-bridge are all force-sensitive resistors; or,

[0011] The bridge arms of the second half-bridge are all non-force-sensitive resistors, and the bridge arms of the first half-bridge are all force-sensitive resistors.

[0012] In one embodiment, the bridge arm of the first half bridge and the bridge arm of the second half bridge are both force-sensitive resistors.

[0013] In one embodiment, the first bridge arm and the second bridge arm are both the non-force-sensitive resistors, and the third bridge arm and the fourth bridge arm are both the force-sensitive resistors; or,

[0014] The first bridge arm and the second bridge arm are both the force-sensitive resistors, and the third bridge arm and the fourth bridge arm are both the non-force-sensitive resistors.

[0015] In one embodiment, the first bridge arm, the third bridge arm, the second bridge arm and the fourth bridge arm are all the force-sensitive resistors.

[0016] In one embodiment, the pressure sensor module further includes:

[0017] A supporting component is arranged on the panel, the first half bridge, the first bridge arm and the second bridge arm are all located in the first plane through the supporting component, the second half bridge, the third bridge arm and the fourth bridge arm are all located in the second plane through the supporting component, and the first bridge arm and the second bridge arm are provided with a hollow structure at the vertical projection of the supporting component.

[0018] 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

[0019] 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.

[0020] 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;

[0021] 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;

[0022] 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.

[0023] 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.

[0024] 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.

[0025] In one embodiment, the processor is further configured to:

[0026] When the panel is pressed by positive pressure, a touch command is output;

[0027] When the panel is pressed by lateral pressure, no touch command is output.

[0028] A pressure detection method, applied to the pressure detection device described in any one of the above embodiments, the method comprising:

[0029] Acquire the first differential input signal and the second differential input signal;

[0030] 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.

[0031] Compared with the prior art, the above-mentioned pressure sensor module, pressure detection device and method, when the panel is under pressure, senses pressure and generates a first differential input signal through the first full-bridge circuit composed of the first half bridge located in the first plane and the second half bridge located in the second plane, and at the same time, the first bridge arm and the second bridge arm are arranged on the first plane, the third bridge arm and the fourth bridge arm are arranged on the second plane, and the first bridge arm and the third bridge arm are electrically connected to form a third half bridge, and the second bridge arm and the fourth bridge arm are electrically connected to form a fourth half bridge. The second full-bridge circuit senses pressure and generates a second differential input signal, and determines whether the force on the panel corresponds to 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

[0032] Figure 1 A schematic diagram of the structure of a pressure sensor module provided in one embodiment of the present application;

[0033] Figure 2 A schematic diagram of the circuit structure of a first full-bridge circuit provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the circuit structure of a second full-bridge circuit provided in an embodiment of the present application;

[0035] Figure 4 A circuit principle block diagram of a pressure detection device provided in one embodiment of the present application;

[0036] Figure 5 A flow chart of a pressure detection method provided in one embodiment of the present application.

[0037] 10 Pressure sensor module

[0038] 100 First full bridge circuit

[0039] 101 First Plane

[0040] 102 Second Plane

[0041] 110 First Half Bridge

[0042] 120 Second Half Bridge

[0043] 20. Pressure detection device

[0044] 21 Processor

[0045] 200 Second full bridge circuit

[0046] 201 Positive reference voltage source

[0047] 202 Negative reference voltage source

[0048] 210 First bridge arm

[0049] 220 Second bridge arm

[0050] 230 Third bridge arm

[0051] 240 Fourth bridge arm

[0052] 300 Support components DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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.

[0056] See also Figure 1 In one embodiment of the present application, a pressure sensor module 10 is provided, comprising: a panel, a first full-bridge circuit 100 and a second full-bridge circuit 200. The first full-bridge circuit 100 is arranged on the panel. At least one half-bridge of the first full-bridge circuit 100 is a force-sensitive resistor. The first full-bridge circuit 100 comprises a first half-bridge 110 and a second half-bridge 120. The first half-bridge 110 is located on a first plane 101. The second half-bridge 120 is located on a second plane 102 parallel to the first plane 101.

[0057] The second full-bridge circuit 200 is arranged on the panel. The second full-bridge circuit 200 includes a first bridge arm 210 and a second bridge arm 220 located on the first plane 101, and a third bridge arm 230 and a fourth bridge arm 240 located on the second plane 102. The first bridge arm 210 and the third bridge arm 230 are electrically connected to form a third half bridge. The second bridge arm 220 and the fourth bridge arm 240 are electrically connected to form a fourth half bridge. The first bridge arm 210 and the second bridge arm 220, and / or the third bridge arm 230 and the fourth bridge arm 240 are force-sensitive resistors. The output end of the first full-bridge circuit 100 and the output end of the second full-bridge circuit 200 are both used to electrically connect a pressure signal detection circuit.

[0058] It is understood that the material of the panel is not limited, as long as it can withstand the pressure applied by the implementer. In one embodiment, the panel is a rigid material, such as a metal plate, a glass plate, a plastic plate, an aluminum alloy plate or other rigid materials. In one embodiment, the panel can also be made of a flexible material.

[0059] It can be understood that the manner in which the first full-bridge circuit 100 is disposed on the panel is not limited, as long as the first full-bridge circuit 100 is fixed to the panel. In one embodiment, the first full-bridge circuit 100 can be pasted on the panel. In one embodiment, the first full-bridge circuit 100 can also be embedded in the panel.

[0060] In one embodiment, at least one half-bridge of the first full-bridge circuit 100 is a force-sensitive resistor, which means that at least one of the first half-bridge 110 and the second half-bridge 120 has a bridge arm that is a force-sensitive resistor. For example, both bridge arms of the first half-bridge 110 are non-force-sensitive resistors, and both bridge arms of the second half-bridge 120 are force-sensitive resistors; or, both bridge arms of the second half-bridge 120 are non-force-sensitive resistors, and both bridge arms of the first half-bridge 110 are force-sensitive resistors; furthermore, both bridge arms of the first half-bridge 110 and both bridge arms of the second half-bridge 120 can be force-sensitive resistors. The pressure on the panel can be sensed by the force-sensitive resistors.

[0061] In one embodiment, Figure 2 As shown, the two bridge arms included in the first half bridge 110 are resistors R11 and R12. The two bridge arms included in the second half bridge 120 are resistors R13 and R14. The first end of the resistor R11 and the first end of the resistor R13 are both used to electrically connect to a preset positive reference voltage source 201. The second end of the resistor R11 is electrically connected to the first end of the resistor R12. The second end of the resistor R13 is electrically connected to the first end of the resistor R14. The second end of the resistor R12 and the second end of the resistor R14 are both used to electrically connect to a preset negative reference voltage source 202.

[0062] It can be understood that the second full-bridge circuit 200 is arranged on the panel in any manner, as long as the second full-bridge circuit 200 is fixed to the panel. In one embodiment, the second full-bridge circuit 200 can be pasted on the panel. In one embodiment, the second full-bridge circuit 200 can also be embedded in the panel.

[0063] In one embodiment, the first bridge arm 210 and the second bridge arm 220 are located in the first plane 101. That is, the first bridge arm 210, the second bridge arm 220 and the first half bridge 110 are located in the same plane. In one embodiment, the third bridge arm 230 and the fourth bridge arm 240 are located in the second plane 102. That is, the third bridge arm 230, the fourth bridge arm 240 and the second half bridge 120 are located in the same plane.

[0064] In one embodiment, the first bridge arm 210 and the third bridge arm 230 are electrically connected to form a third half bridge, which means that the first end of the first bridge arm 210 is electrically connected to the second end of the third bridge arm 230. The first end of the third bridge arm 230 is used to electrically connect a preset positive reference voltage source 201 (such as Figure 3The second end of the first bridge arm 210 is used to electrically connect to a preset negative reference voltage source 202. In one embodiment, the negative reference voltage source 202 may be grounded or not grounded, which may be selected according to actual needs.

[0065] In one embodiment, the second bridge arm 220 and the fourth bridge arm 240 are electrically connected to form a fourth half bridge, which means that the second end of the second bridge arm 220 is electrically connected to the first end of the fourth bridge arm 240. The first end of the second bridge arm 220 is used to electrically connect to a preset positive reference voltage source 201. The second end of the fourth bridge arm 240 is used to electrically connect to a preset negative reference voltage source 202.

[0066] In one embodiment, the first bridge arm 210 and the second bridge arm 220, and / or the third bridge arm 230 and the fourth bridge arm 240 are force-sensitive resistors, which means: the first bridge arm 210 and the second bridge arm 220 are force-sensitive resistors; or the third bridge arm 230 and the fourth bridge arm 240 are force-sensitive resistors; or the first bridge arm 210, the second bridge arm 220, the third bridge arm 230 and the fourth bridge arm 240 are all force-sensitive resistors. That is, at least two of the four bridge arms of the second full-bridge circuit 200 that are located in the same plane are force-sensitive resistors.

[0067] For example, the first bridge arm 210 and the second bridge arm 220 located on the first plane 101 are both the force-sensitive resistors. The third bridge arm 230 and the fourth bridge arm 240 located on the second plane 102 are both the force-sensitive resistors. The pressure on the panel can be sensed by the force-sensitive resistors. In one embodiment, the pressure signal detection circuit can adopt a conventional signal detection circuit, such as a signal detector.

[0068] In this embodiment, when the panel is under pressure, the first full-bridge circuit 100 composed of the first half-bridge 110 located on the first plane 101 and the second half-bridge 120 located on the second plane 102 senses pressure and generates a first differential input signal. At the same time, the first bridge arm 210 and the second bridge arm 220 are arranged on the first plane 101, the third bridge arm 230 and the fourth bridge arm 240 are arranged on the second plane 102, and the first bridge arm 210 and the third bridge arm 230 are electrically connected to form a third half bridge, and the second bridge arm 220 and the fourth bridge arm 240 are electrically connected to form a fourth half bridge. The second full-bridge circuit 200 senses pressure and generates a second differential input signal. Based on the first differential input signal and the second differential input signal, it is determined whether the force on the panel corresponds, so that the present embodiment can correctly identify the forward and lateral pressure signals, avoid misidentification, and thereby improve the reliability of identification.

[0069] In one embodiment, the first bridge arm 210 and the second bridge arm 220 are both the non-force sensitive resistors, and the third bridge arm 230 and the fourth bridge arm 240 are both the force sensitive resistors. Alternatively, the first bridge arm 210 and the second bridge arm 220 are both the force sensitive resistors, and the third bridge arm 230 and the fourth bridge arm 240 are both the non-force sensitive resistors.

[0070] In one embodiment, the first bridge arm 210 and the second bridge arm 220 are both the non-force sensitive resistors, which means that the first bridge arm 210 and the second bridge arm 220 are both ordinary fixed resistance resistors. At this time, the force on the panel can be sensed by the third bridge arm 230 and the fourth bridge arm 240, which are both force sensitive resistors. In one embodiment, the third bridge arm 230 and the fourth bridge arm 240 are both the non-force sensitive resistors, which means that the third bridge arm 230 and the fourth bridge arm 240 are both ordinary fixed resistance resistors. At this time, the force on the panel can be sensed by the first bridge arm 210 and the second bridge arm 220, which are both force sensitive resistors.

[0071] In one embodiment, the first bridge arm 210, the third bridge arm 230, the second bridge arm 220 and the fourth bridge arm 240 are all force-sensitive resistors. At this time, the first bridge arm 210, the third bridge arm 230, the second bridge arm 220 and the fourth bridge arm 240 can simultaneously sense the force on the panel.

[0072] In one embodiment, the pressure sensor module 10 further includes: a supporting component 300. The supporting component 300 is disposed on the panel. The first half bridge 110, the first bridge arm 210 and the second bridge arm 220 are all located on the first plane 101 through the supporting component 300. The second half bridge 120, the third bridge arm 230 and the fourth bridge arm 240 are all located on the second plane 102 through the supporting component 300. The first bridge arm 210 and the second bridge arm 220 are provided with a hollow structure at the vertical projection of the supporting component 300.

[0073] In one embodiment, the support member 300 may be flexible or rigid. Optionally, the support member 300 may be flexible, such as foam. In one embodiment, the first plane 101 may be the top outer surface or the bottom outer surface of the support member 300. The second plane 102 may be the bottom outer surface or the top outer surface of the support member 300.

[0074] In one embodiment, the first bridge arm 210 and the second bridge arm 220 are provided with a hollow structure at the vertical projection of the support component 300, which means that the first bridge arm 210 and the second bridge arm 220 are not solid at the vertical projection of the support component 300, that is, the hollow structure is provided at the projection, so that the support component 300 can be deformed when receiving pressure, thereby enabling the first full-bridge circuit 100 and the second full-bridge circuit 200 to sense the force of the panel and generate a corresponding differential input signal. In one embodiment, the specific shape of the hollow structure is not limited, as long as it can cause the support component 300 to be deformed when receiving pressure.

[0075] In one embodiment, multiple (such as three) support members 300 may be arranged at intervals (such as Figure 1 As shown), two gaps can be formed at this time. In one embodiment, the first half bridge 110 and the second half bridge 120 can be set in any one of the two gaps, and the first half bridge 110 and the second half bridge 120 are respectively located on the top outer surface and the bottom outer surface of the support component 300. Similarly, the first bridge arm 210, the second bridge arm 220, the third bridge arm 230 and the fourth bridge arm 240 can be set in another gap, and the first bridge arm 210 and the second bridge arm 220 are located on the bottom outer surface of the support component 300, and the third bridge arm 230 and the fourth bridge arm 240 are located on the top outer surface of the support component 300. With the above structure, the support component 300 can be replaced with a rigid support component, such as a metal plate, a glass plate, a plastic plate, an aluminum alloy plate or other rigid support components.

[0076] See also Figure 4 An 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 100 is used to sense pressure and generate a first differential input signal. The second full-bridge circuit 200 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 100 and the second full-bridge circuit 200, 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 based on the first differential input signal and the second differential input signal.

[0077] In one embodiment, the specific circuit structures of the first full-bridge circuit 100 and the second full-bridge circuit 200 may adopt the structures described in the above embodiments. In one embodiment, the first half-bridge 110 and / or the second half-bridge 120 (force-sensitive resistor) in the first full-bridge circuit 100 may sense the force (i.e., the pressure applied by the implementer) of the panel, and generate a first differential input signal. Similarly, the first bridge arm 210 and the second bridge arm 220, and / or the third bridge arm 230 and the fourth bridge arm 240 (force-sensitive resistor) in the second full-bridge circuit 200 may sense the force of the panel and generate a second differential input signal.

[0078] 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 on the panel based on the first differential input signal and the second differential input signal.

[0079] Specifically, it is assumed that the two bridge arms of the first half-bridge 110 are resistors R11 and R12, respectively, and the two bridge arms of the second half-bridge 120 are resistors R13 and R14, respectively; the resistance of the first bridge arm 210 is R22, the resistance of the second bridge arm 220 is R23, the resistance of the third bridge arm 230 is R24, and the resistance of the fourth bridge arm 240 is R21. Among them, R11, R12, R13, R14, R21, R22, R23 and R24 are all force-sensitive 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:

[0080] S1=(S1+)-(S1-)=VS*(R12 / (R12+R11)-R14 / (R13+R14));

[0081] S2=(S2+)-(S2-)=VS*(R22 / (R22+R24)-R21 / (R21+R23));

[0082] When the panel 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 1For example, the force-sensitive resistors (R11, R12, R22, R23) along the outside of the force direction increase their resistance due to stretching, and the force-sensitive resistors (R13, R14, R21, R24) along the inside of the force direction decrease their resistance due to extrusion. It can be seen from the above formula that since R11 and R12 increase in equal proportion, the S1+ (indicating the positive input of the first differential input signal) signal remains unchanged; R13 and R14 decrease in equal proportion, and 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 decreases, it can be seen that the S2+ (indicating the positive input of the second differential input signal) signal increases; since R23 increases and R21 increases, 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.

[0083] It can be known from the above logic that when the panel 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 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 obvious, so that the processor 21 can determine whether to respond to the force applied to the panel. In one embodiment, when the panel 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.

[0084] When the panel is subjected to pressure from the Y-axis (i.e., lateral force), the force-sensitive resistors (R11, R14, R22, R24) increase in resistance due to stretching, and the force-sensitive resistors (R12, R13, R21, R23) decrease in resistance due to extrusion. 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 increases and R12 decreases, the S1+ signal decreases; as R13 decreases and R14 increases, the S1- signal increases; that is, S1 decreases significantly. In other words, at this time, the first differential input signal changes significantly. Since R22 and R24 increase in equal proportions, it can be seen that S2+ remains unchanged; since R23 and R21 increase in equal proportions, it can be seen that the S2- signal remains unchanged; that is, S2 does not change significantly.

[0085] It can be known from the above logic that when the panel 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 is subjected to pressure from the Y axis can be determined 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. In one embodiment, when the panel 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.

[0086] In this embodiment, when the panel is under pressure, the first full-bridge circuit 100 composed of the first half-bridge 110 located on the first plane 101 and the second half-bridge 120 located on the second plane 102 senses pressure and generates a first differential input signal. At the same time, the first bridge arm 210 and the second bridge arm 220 are arranged on the first plane 101, the third bridge arm 230 and the fourth bridge arm 240 are arranged on the second plane 102, and the first bridge arm 210 and the third bridge arm 230 are electrically connected to form a third half bridge, and the second bridge arm 220 and the fourth bridge arm 240 are electrically connected to form a fourth half bridge. The second full-bridge circuit 200 senses pressure and generates a second differential input signal, and determines whether the panel is subjected to force based on the first differential input signal and the second differential input signal through the processor 21, so that the present embodiment can correctly identify the forward and lateral pressure signals, avoid misidentification, and thereby improve the reliability of identification.

[0087] In one embodiment, when the panel 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 based on the comparison result.

[0088] 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 is being pressed by a positive pressure, and the processor 21 may respond to the force on the panel. In one embodiment, if the first change amplitude is larger than the second change amplitude, it is determined that the panel is being pressed by a lateral pressure, and the processor 21 may not respond to the force on the panel.

[0089] In one embodiment, when the panel is pressed by positive pressure, that is, when the processor 21 responds to the force on the panel, the processor 21 may output a touch command. When the panel is pressed by lateral pressure, that is, when the processor 21 does not respond to the force on the panel, the processor 21 does not output a touch command. Optionally, the touch command may be a key command or a non-key command.

[0090] See also Figure 5 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. The method includes:

[0091] S102: Acquire the first differential input signal and the second differential input signal.

[0092] 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.

[0093] S104: Determine whether to respond to the force applied to the panel based on the first differential input signal and the second differential input signal.

[0094] In one embodiment, the processor 21 may determine whether to respond to the force on the panel 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 on the panel based on the change amplitude of the first differential input signal and the change amplitude of the second differential input signal.

[0095] 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 is being pressed by positive pressure, and the processor 21 can respond to the force on the panel. 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 is being pressed by lateral pressure, and the processor 21 does not respond to the force on the panel.

[0096] In the present embodiment, when the panel is under pressure, the first differential input signal and the second differential input signal are obtained, and the processor 21 determines whether the corresponding panel is subjected to force 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.

[0097] 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 on the panel based on the comparison result.

[0098] In one embodiment, the step of comparing the first change amplitude with the second change amplitude and determining whether to respond to the force on the panel based on the comparison result includes: comparing 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 is being pressed by positive pressure, and the processor 21 responds to the force on the panel. If the first change amplitude is larger than the second change amplitude, it is determined that the surface 100 is being pressed by lateral pressure, and the processor 21 does not respond to the force on the panel.

[0099] In one embodiment, when the panel is pressed by positive pressure, that is, when the processor 21 responds to the force on the panel, the processor 21 may output a touch command. When the panel is pressed by lateral pressure, that is, when the processor 21 does not respond to the force on the panel, the processor 21 does not output a touch command. Optionally, the touch command may be a key command or a non-key command.

[0100] To summarize, when the panel is under pressure, the first full-bridge circuit 100 composed of the first half-bridge 110 located on the first plane 101 and the second half-bridge 120 located on the second plane 102 senses pressure and generates a first differential input signal. At the same time, the first bridge arm 210 and the second bridge arm 220 are arranged on the first plane 101, the third bridge arm 230 and the fourth bridge arm 240 are arranged on the second plane 102, and the first bridge arm 210 and the third bridge arm 230 are electrically connected to form a third half-bridge, and the second bridge arm 220 and the fourth bridge arm 240 are electrically connected to form a fourth half-bridge. The second full-bridge circuit 200 senses pressure and generates a second differential input signal, and determines whether the force on the panel corresponds to the first differential input signal and the second differential input signal based on the first 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.

[0101] 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.

[0102] 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 detection device, It is characterized in that The invention comprises a pressure sensor module (10) and a processor (21), wherein the pressure sensor module (10) comprises: a panel, a first full-bridge circuit (100), and a second full-bridge circuit (200), wherein the first full-bridge circuit (100) is used to sense pressure and generate a first differential input signal, and the second full-bridge circuit (200) is used to sense the pressure and generate a second differential input signal; The first full-bridge circuit (100) is arranged on the panel, at least one half-bridge of the first full-bridge circuit (100) is a force-sensitive resistor, the first full-bridge circuit (100) comprises a first half-bridge (110) and a second half-bridge (120), the first half-bridge (110) is located on a first plane (101), and the second half-bridge (120) is located on a second plane (102) parallel to the first plane (101); and The second full-bridge circuit (200) is arranged on the panel, the second full-bridge circuit (200) comprises a first bridge arm (210) and a second bridge arm (220) located on the first plane (101), and a third bridge arm (230) and a fourth bridge arm (240) located on the second plane (102), the first bridge arm (210) and the third bridge arm (230) are electrically connected to form a third half bridge, the second bridge arm (220) and the fourth bridge arm (240) are electrically connected to form a fourth half bridge, and the first bridge arm (210) and the second bridge arm (220), and / or the third bridge arm (230) and the fourth bridge arm (240) are force-sensitive resistors; When the panel 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 configured to determine a 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 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 (21) responds to the force on the panel.

2. The pressure detection device according to claim 1, It is characterized in that The bridge arms of the first half-bridge (110) are all non-force-sensitive resistors, and the bridge arms of the second half-bridge (120) are all force-sensitive resistors; or, The bridge arms of the second half-bridge (120) are all non-force-sensitive resistors, and the bridge arms of the first half-bridge (110) are all force-sensitive resistors.

3. The pressure detection device according to claim 1, It is characterized in that The bridge arm of the first half-bridge (110) and the bridge arm of the second half-bridge (120) are both force-sensitive resistors.

4. The pressure detection device according to claim 2 or 3, It is characterized in that The first bridge arm (210) and the second bridge arm (220) are both non-force-sensitive resistors, and the third bridge arm (230) and the fourth bridge arm (240) are both force-sensitive resistors; or, The first bridge arm (210) and the second bridge arm (220) are both force-sensitive resistors, and the third bridge arm (230) and the fourth bridge arm (240) are both non-force-sensitive resistors.

5. The pressure detection device according to claim 2 or 3, It is characterized in that The first bridge arm (210), the third bridge arm (230), the second bridge arm (220) and the fourth bridge arm (240) are all force-sensitive resistors.

6. The pressure detection device according to claim 1, It is characterized in that Also includes: A support component (300) is arranged on the panel, the first half bridge (110), the first bridge arm (210) and the second bridge arm (220) are all located on the first plane (101) through the support component (300), the second half bridge (120), the third bridge arm (230) and the fourth bridge arm (240) are all located on the second plane (102) through the support component (300), and the first bridge arm (210) and the second bridge arm (220) are provided with a hollow structure at a vertical projection of the support component (300).

7. The pressure detection device according to claim 1, It is characterized in that 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 (21) does not respond to the force applied to the panel.

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

9. The pressure detection device according to claim 1, It is characterized in that The panel is made of rigid material or flexible material.

10. A pressure detection method, It is characterized in that Applied to the pressure detection device (20) as claimed in claim 1, the method comprises: Acquire the first differential input signal and the second differential input signal; 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.

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