CN111147061A - Pressure sensor module, pressure detection device and method - Google Patents

Abstract

The application provides a pressure sensor module, pressure detection device and method, the pressure sensor module includes: the panel, first full-bridge circuit and second full-bridge circuit. The first full-bridge circuit is arranged on the panel. And 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 with the second bridge arm, and the first bridge arm and the second bridge arm are both non-strain resistors. And the output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used for connecting a pressure signal detection circuit. This application is in when the panel bears pressure, through first full-bridge circuit with the cooperation of second full-bridge circuit can correctly discern forward and side direction and press the signal, avoids the mistake recognition phenomenon, and then improves the reliability of discernment.

Description

Pressure sensor module, pressure detection device and method

Technical Field

The application relates to the technical field of pressure sensing keys, in particular to a pressure sensor module, a pressure detection device and a pressure detection method.

Background

The forced induction button is based on the novel button of forced induction technique, adopts the forced induction structure to replace mechanical button structure, can turn into control signal with applying the power on the forced induction panel to realize corresponding control function. Compared with a mechanical key, the pressure sensing key has the advantages of high sensitivity, long service life, small occupied area and the like, can replace the original mechanical key in a plurality of fields, and provides a richer man-machine interaction mode for a plurality of input devices.

Currently, the pressure sensing key is widely applied to electronic equipment. The pressure sensing button realizes the principle on electronic equipment to be with the sensor laminating at the center inner wall, through the deformation of response frame to convert the signal of telecommunication into. Identified as a key by some algorithm. However, the deformation of the frame is not only generated when the frame is pressed, but also the middle frame is deformed when the electronic device is distorted. The existing pressure sensing key can not correctly identify the forward and lateral pressing signals, and has the problem of false identification.

Disclosure of Invention

Accordingly, it is desirable to provide a pressure sensor module, a pressure detection apparatus and a method thereof, which can solve the problem that the conventional pressure sensing key cannot correctly identify the forward and lateral pressing signals and has erroneous identification.

A pressure sensor module, comprising:

a panel;

the first full-bridge circuit is arranged on the panel, and four bridge arms of the first full-bridge circuit are all strain resistors; and

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

and the output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used for connecting a pressure signal detection circuit.

In one embodiment, the second full-bridge circuit further comprises: a third leg and a fourth leg;

the third bridge arm is not connected with the fourth bridge arm, and the third bridge arm and the fourth bridge arm are both strain resistors.

In one embodiment, the first leg, the second leg, the third leg, and the fourth leg are located in a same plane.

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, 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.

In one embodiment, the first end of the first bridge arm and the first end of the fourth bridge arm are both used for electrically connecting a preset positive reference voltage source, the second end of the first bridge arm is electrically connected with the first end of the third bridge arm, the second end of the fourth bridge arm is electrically connected with 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 for electrically connecting a preset negative reference voltage source.

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

and the processor is respectively electrically connected with the first full bridge circuit and the second full bridge circuit, is used for acquiring the first differential input signal and the second differential input signal, and determines whether to respond to the stress of the panel or not based on the first differential input signal and the second differential input signal.

In one embodiment, when the panel is under pressure, the processor is configured to determine a variation amplitude of the first differential input signal based on the first differential input signal and obtain a first variation amplitude;

the processor 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 compares the first magnitude of variation with the second magnitude of variation and determines whether to respond to the force of the panel based on the comparison.

In one embodiment, if the first variation amplitude is smaller than the second variation amplitude, it is determined that the panel is being pressed by a positive pressure, and the processor responds to the force applied to the panel.

In one embodiment, if the first variation amplitude is larger than the second variation amplitude, it is determined that the panel is being pressed by lateral pressure, and the processor does not respond to the force of the panel.

In one embodiment, the processor is further configured to:

when the panel is pressed by positive pressure, a touch instruction is output;

when the panel is pressed by lateral pressure, no touch instruction is output.

A pressure detection method applied to the pressure detection device according to any one of the above embodiments, the method comprising:

acquiring the first differential input signal and the second differential input signal;

determining whether to respond to a force of the panel based on the first differential input signal and the second differential input signal.

Compared with the prior art, the pressure sensor module, the pressure detection device and the pressure detection method have the advantages that when the panel bears pressure, the first full-bridge circuit senses the pressure and generates a first differential input signal, meanwhile, the first bridge arm and the second bridge arm (non-strain resistor) which are not connected in the second full-bridge circuit are matched, a second differential input signal is generated, and whether the stress of the panel is responded or not is determined based on the first differential input signal and the second differential input signal, so that the forward and lateral pressing signals can be correctly identified, the phenomenon of misrecognition is avoided, and the reliability of identification is improved.

Drawings

Fig. 1 is a schematic structural diagram of a pressure sensor module according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit diagram of a first full-bridge circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit diagram of a second full-bridge circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a pressure sensor module according to another embodiment of the present disclosure;

FIG. 5 is a schematic block diagram of a pressure detection apparatus according to an embodiment of the present disclosure;

fig. 6 is a flowchart of a pressure key identification method according to an embodiment of the present application.

10 pressure sensor module

100 panel

110 first surface

120 second surface

20 pressure detection device

21 processor

200 first full bridge circuit

300 second full bridge circuit

301 positive reference voltage source

302 negative reference voltage source

310 first leg

320 second bridge arm

330 third bridge arm

340 fourth leg

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, an embodiment of the present application provides a pressure sensor module 10, including: a panel 100, a first full-bridge circuit 200 and a second full-bridge circuit 300. The first full-bridge circuit 200 is disposed on the panel 100. The four arms of the first full-bridge circuit 200 are all strain resistors. The second full-bridge circuit 300 is disposed on the panel 100. The second full-bridge circuit 300 includes a first leg 310 and a second leg 320. The first leg 310 is not connected to the second leg 320, and both the first leg 310 and the second leg 320 are non-strain resistors. And the output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used for connecting a pressure signal detection circuit.

It is understood that the material of the panel 100 is not limited as long as it can withstand the pressure applied by the operator. 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 material.

It is understood that the specific circuit structure of the first full-bridge circuit 200 is not limited as long as it has the function of sensing the pressure and generating the first differential input signal. In one embodiment, the first full-bridge circuit 200 may include four legs, and each leg is a strain resistor. In one embodiment, the four legs may be located in the same plane.

It should be understood that the manner of disposing the first full-bridge circuit 200 on the panel 100 is not limited, as long as the first full-bridge circuit 200 is secured to the panel 100. In one embodiment, the first full-bridge circuit 200 may be adhered to the panel 100. In one embodiment, the first full bridge circuit 200 may be embedded on the panel 100.

It should be understood that the manner of disposing the second full-bridge circuit 300 on the panel 100 is not limited, as long as the second full-bridge circuit 300 is secured to the panel 100. In one embodiment, the second full-bridge circuit 300 may be attached to the panel 100. In one embodiment, the second full-bridge circuit 300 may be embedded on the panel 100.

In one embodiment, the second full bridge circuit 300 may include a first bridge leg 310 and a second bridge leg 320, and the first bridge leg 310 and the second bridge leg 320 are both non-strain resistors. While first leg 310 is unconnected to second leg 320. That is, there is no electrical connection between the first leg 310 and the second leg 320. In one embodiment, the non-strain resistance of both the first leg 310 and the second leg 320 means: the first leg 310 and the second leg 320 are both common resistors.

In one embodiment, the second full-bridge circuit 300 further comprises: third leg 330 and fourth leg 340. Third leg 330 is unconnected to fourth leg 340. Third leg 330 and fourth leg 340 are each a strain resistor. In one embodiment, the disconnection of third leg 330 from fourth leg 340 means: the third leg 330 and the fourth leg 340 are not electrically connected. In one embodiment, the pressure signal detection circuit may employ a conventional signal detection circuit, such as a signal detector or the like.

In this embodiment, when the panel 100 bears a pressure, the first full-bridge circuit 200 senses the pressure and generates a first differential input signal, and simultaneously, the first bridge arm 310 and the second bridge arm 320 (non-strain resistors) which are not connected in the second full-bridge circuit 300 cooperate with each other, the second full-bridge circuit 300 senses the pressure and generates a second differential input signal, and whether the stress of the panel 100 is responded is determined based on the first differential input signal and the second differential input signal, so that the present embodiment can correctly recognize forward and lateral pressing signals, avoid a false recognition phenomenon, and further improve the reliability of recognition.

In one embodiment, first leg 310, second leg 320, third leg 330, and fourth leg 340 are in the same plane. That is, first leg 310, second leg 320, third leg 330, and fourth leg 340 may all be located on first surface 110 of panel 100. Whether to respond to the stress of the panel 100 can be determined by the arrangement mode.

Referring to fig. 4, in an embodiment, the first leg 310 and the second leg 320 are located on one side of the panel 100, the third leg 330 and the fourth leg 340 are located on the other side of the panel 100, two legs of the first full-bridge circuit 200 are located on one side of the panel 100, and the other two legs of the first full-bridge circuit 200 are located on the other side of the panel 100.

In one embodiment, first leg 310 and second leg 320 can be positioned on first surface 110 of panel 100 and third leg 330 and fourth leg 340 can be positioned on second surface 120 of 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 of the unstrained resistors and the strained resistors may be interchanged. That is, first leg 310 and second leg 320 can be positioned on second surface 120 of panel 100 and third leg 330 and fourth leg 340 can be positioned on first surface 110 of panel 100.

In one embodiment, as can be seen from the above embodiments, the first leg 310 and the second leg 320 are always located on the same plane, and the third leg 330 and the fourth leg 340 are always located on the same plane. In one embodiment, any two legs of the first full-bridge circuit 200 may be located on one side of the panel 100 (i.e., the first surface 110 or the second surface 120), and the other two legs of the first full-bridge circuit 200 may be located on the other side of the panel 100 (i.e., the second surface 120 or the first surface 110).

That is, any two legs of the first full-bridge circuit 200 must be located on the same plane as the first leg 310 and the second leg 320, and the other two legs of the first full-bridge circuit 200 must be located on the same plane as the third leg 330 and the fourth leg 340. Whether to respond to the stress of the panel 100 can also be determined by the arrangement mode.

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

In one embodiment, the four legs in the first full-bridge circuit 200 may be connected as described above. In an embodiment, the negative reference voltage source 302 may be grounded or not, and may be selected according to actual requirements.

Referring to fig. 5, another embodiment of the present application provides a pressure detection apparatus 20, which includes the pressure sensor module 10 according to any one 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 configured to obtain the first differential input signal and the second differential input signal, and determine whether to respond to a force applied to the panel 100 based on the first differential input signal and the second differential input signal.

In one embodiment, the specific circuit structure of the first full-bridge circuit 200 and the second full-bridge circuit 300 may adopt the structure described in the above embodiments. In one embodiment, the force applied to the panel 100 (i.e., the pressure applied by the implementer) may be sensed by the first full-bridge circuit 200 (strain resistance) and a first differential input signal is generated. Likewise, the force applied to the panel 100 can be sensed by the second full-bridge circuit 300 and a second differential input signal can be generated.

In one embodiment, the pressure signal detection circuit may be integrated within the processor 21. The processor 21 may determine whether to respond to the force of the panel 100 based on the first differential input signal and the second differential input signal after acquiring the first differential input signal and the second differential input signal.

Specifically, it is assumed that the four legs of the first full-bridge circuit 200 are R11, R12, R13 and R14; the resistance of the first leg 310 is R24, the resistance of the second leg 320 is R21, the resistance of the third leg 330 is R22, and the resistance of the fourth leg 340 is R23. Wherein, R24 and R21 are common resistors (namely non-strain resistors), and R11, R12, R13, R14, R22 and R23 are all strain resistors. The variation of the first differential input signal S1 and the second differential input signal S2 at this time can be obtained by the following formula:

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

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

when the panel 100 is subjected to pressure from the Z-axis (i.e., a positive force), the pressure is assumed to be directed downward along the Z-axis, i.e., opposite to the Z-axis arrow. Taking fig. 1 as an example, all the strain resistors (R11, R12, R13, R14, R22, and R23) in the same plane have larger tensile resistance values, while the resistance values of the non-strain resistors R23 and R24 are not changed, and as can be seen from the above formula, the S1+ (representing the positive input of the first differential input signal) signal is not changed because the ratio of R11 to R12 is larger; the ratio of R13, R14, etc. is large, and the S1- (representing the negative input of the first differential input signal) signal is unchanged; i.e., S1 is unchanged. That is, the first differential input signal does not change significantly at this time. Since R22 becomes large and R24 does not change, it is known that the S2+ (indicating the positive input of the second differential input signal) signal becomes large; since R23 becomes large and R21 does not change, it is known that the S2- (representing the negative input of the second differential input signal) signal becomes small; i.e., S2 becomes larger. That is, the second differential input signal changes significantly at this time. Taking fig. 4 as an example, when the resistors are distributed on different planes, the strain resistors on the outer side in the force-receiving direction are all increased in tensile resistance value, the strain resistors on the inner side in the force-receiving direction are all decreased in compressive resistance value, and the resistance values of the non-strain resistors R23 and R24 are not changed, which also results in that the first differential signal S1 is not changed significantly and the second differential signal S2 is changed significantly.

From the above logic, when the panel 100 is subjected to pressure from the Z-axis, the first differential input signal does not change significantly and the second differential input signal does change significantly. That is, whether the panel 100 is pressed from the Z-axis may be determined by whether the change of the first differential input signal and the change of the second differential input signal are significant, so that the processor 21 may determine whether to respond to the force applied to the panel 100. In one embodiment, when the panel 100 is under pressure, if the first differential input signal does not change significantly and the second differential input signal does change significantly, the processor 21 responds to the force applied to the panel 100.

When the panel 100 is subjected to a pressure in the direction of the arrow of the Y axis (i.e., a lateral force), taking fig. 1 as an example, the strain resistors (R12, R13, and R23) on the outer side in the force receiving direction become larger in tensile resistance, the strain resistors (R11, R14, and R22) on the inner side in the force receiving direction become smaller in compression resistance, and the non-strain resistors R21 and R24 do not become constant in resistance. The variation of the first differential input signal S1 and the second differential input signal S2 at this time can be obtained by the above formula. Specifically, as R11 becomes smaller and R12 becomes larger, the S1+ signal becomes larger; the R13 becomes large, the R14 becomes small, and the S1-signal becomes small; i.e., S1 becomes significantly smaller. That is, the first differential input signal changes significantly at this time. Since R22 became small and R24 became unchanged, it was found that the S2+ signal became small; the S2-signal becomes smaller because R23 becomes larger and R21 becomes unchanged; i.e., S2 did not change significantly.

From the above logic, when the panel 100 is subjected to pressure from the Y-axis, the first differential input signal changes significantly and the second differential input signal does not change significantly. That is, whether the panel 100 is pressed from the Y-axis may be determined by whether the change of the first differential input signal and the change of the second differential input signal are significant, so that the processor 21 may determine whether to respond to the force applied to the panel 100. In one embodiment, when the panel 100 is under pressure, if the first differential input signal changes significantly and the second differential input signal does not change significantly, the processor 21 does not respond to the force applied to the panel 100.

In this embodiment, when the panel 100 bears a pressure, the first full-bridge circuit 200 senses the pressure and generates a first differential input signal, and simultaneously, the second full-bridge circuit 300 senses the pressure and generates a second differential input signal by matching the first bridge arm 310 and the second bridge arm 320 (non-strain resistors) which are not connected in the second full-bridge circuit 300, and the processor 21 determines whether to respond to the stress of the panel 100 based on the first differential input signal and the second differential input signal, so that the present embodiment can correctly recognize forward and lateral pressing signals, avoid a misrecognition phenomenon, and further improve the reliability of recognition.

In one embodiment, the processor 21 is configured to determine a variation amplitude of the first differential input signal based on the first differential input signal when the panel 100 is under pressure, and obtain a first variation 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 variation amplitude with the second variation amplitude, and determines whether to respond to the force applied to the panel 100 based on the comparison result.

In one embodiment, the processor 21 may compare the difference between the first variation amplitude and the second variation amplitude, and if the first variation amplitude is smaller than the second variation amplitude, it is determined that the panel 100 is being pressed by a forward pressure, and the processor 21 may respond to the force applied to the panel 100. In one embodiment, if the first variation is larger than the second variation, it may be 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.

In one embodiment, the processor 21 may output a touch instruction when the panel 100 is pressed by a positive pressure, i.e., when the processor 21 responds to the force applied to the panel 100. 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 instruction. Optionally, the touch instruction may be a key instruction or a non-key instruction.

Referring to fig. 6, another embodiment of the present application provides a pressure detection method applied to the pressure detection apparatus 20 according to any of the above embodiments, the method includes:

s102: obtaining the first differential input signal and the second differential input signal.

In one embodiment, the first differential input signal and the second differential input signal may be obtained by the processor 21. Specifically, the processor 21 may obtain the first differential input signal and the second differential input signal in the manner described in the above embodiment.

S104: determining whether to respond to a force of the panel 100 based on the first differential input signal and the second differential input signal.

In one embodiment, whether to respond to a force applied to the panel 100 may be determined by the processor 21 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 variation amplitude of the first differential input signal and the variation amplitude of the second differential input signal.

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

In this embodiment, when the panel 100 bears a pressure, the first full-bridge circuit 200 senses the pressure and generates a first differential input signal, and simultaneously, the second full-bridge circuit 300 senses the pressure and generates a second differential input signal by matching the first bridge arm 310 and the second bridge arm 320 (non-strain resistors) which are not connected in the second full-bridge circuit 300, and the processor 21 determines whether to respond to the stress of the panel 100 based on the first differential input signal and the second differential input signal, so that the present embodiment can correctly recognize forward and lateral pressing signals, avoid a misrecognition phenomenon, and further improve the reliability of recognition.

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

In one embodiment, the step of comparing the first variation amplitude with the second variation amplitude and determining whether to respond to the force applied to the panel 100 based on the comparison result comprises: comparing the difference between the first variation range and the second variation range, and if the first variation range is smaller than the second variation range, determining that the panel 100 is being pressed by a forward pressure, and the processor 21 responds to the force applied to the panel 100. If the first variation range is larger than the second variation range, it is determined that the surface 100 is being pressed by the lateral pressure, and the processor 21 does not respond to the force applied to the panel 100.

In one embodiment, the processor 21 may output a touch instruction when the panel 100 is pressed by a positive pressure, i.e., when the processor 21 responds to the force applied to the panel 100. 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 instruction. Optionally, the touch instruction may be a key instruction or a non-key instruction.

To sum up, this application is in when panel 100 bears pressure, through first full-bridge circuit 200 response pressure and produce first difference input signal, pass through simultaneously in the second full-bridge circuit 300 disconnected first bridge arm 310 with second bridge arm 320 (non-strain resistance) cooperation to produce second difference input signal, and based on first difference input signal with whether the second difference input signal is confirmed to respond to panel 100's atress, thereby make this application can correctly discern forward and side direction and press the signal, avoid the misidentification phenomenon, and then improve the reliability of discernment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. A pressure sensor module, comprising:

a panel (100);

the first full-bridge circuit (200) is arranged on the panel (100), and four bridge arms of the first full-bridge circuit (200) are all strain resistors; and

the second full-bridge circuit (300) is arranged on the panel (100), the second full-bridge circuit (300) comprises a first bridge arm (310) and a second bridge arm (320), the first bridge arm (310) is not connected with the second bridge arm (320), and the first bridge arm (310) and the second bridge arm (320) are both non-strain resistors;

and the output end of the first full-bridge circuit and the output end of the second full-bridge circuit are respectively used for connecting a pressure signal detection circuit.

2. The pressure sensor module of claim 1, wherein the second full-bridge circuit (300) further comprises: a third leg (330) and a fourth leg (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.

3. The pressure sensor module of claim 2, wherein the first leg (310), the second leg (320), the third leg (330), and the fourth leg (340) are in the same plane.

4. Pressure sensor module according to claim 2, characterized in that the first leg (310) and the second leg (320) are located on one side of the panel (100), the third leg (330) and the fourth leg (340) are located on the other side of the panel (100), and two legs of the first full-bridge circuit (200) are located on one side of the panel (100) and the other two legs of the first full-bridge circuit (200) are located on the other side of the panel (100).

5. Pressure sensor module according to claim 2, characterized in that the first end of the first bridge leg (310) and the first end of the fourth bridge leg (340) are both used for electrically connecting a preset positive reference voltage source (301), the second end of the first bridge leg (310) is electrically connected to the first end of the third bridge leg (330), the second end of the fourth bridge leg (340) is electrically connected to the first end of the second bridge leg (320), and the second end of the third bridge leg (330) and the second end of the second bridge leg (320) are both used for electrically connecting a preset negative reference voltage source (302).

6. A pressure detection device comprising the pressure sensor module (10) of any of claims 1-5, the first full-bridge circuit (200) for sensing pressure and generating a first differential input signal, the second full-bridge circuit (300) for sensing the pressure and generating a second differential input signal; and

a processor (21) electrically connected to the first full-bridge circuit (200) and the second full-bridge circuit (300), respectively, for obtaining the first differential input signal and the second differential input signal, and determining whether to respond to a force applied to the panel (100) based on the first differential input signal and the second differential input signal.

7. The pressure detection device of claim 6, wherein the processor (21) is configured to determine a magnitude of change of the first differential input signal based on the first differential input signal and obtain a first magnitude of change when the panel (100) is subjected to a pressure;

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 magnitude of change with the second magnitude of change and determines whether to respond to the force of the panel (100) based on the comparison.

8. The pressure detection device of claim 7, wherein if the first magnitude of change is less than the second magnitude of change, it is determined that the panel (100) is being pressed by a positive pressure, and the processor (21) is responsive to the force applied to the panel (100).

9. The pressure detection device of claim 8, wherein if the first magnitude of variation is greater than the second magnitude of variation, it is determined that the panel (100) is being pressed by a lateral pressure, and the processor (21) is not responsive to the force of the panel (100).

10. The pressure detection apparatus of claim 9, wherein the processor (21) is further configured to:

when the panel (100) is pressed by positive pressure, a touch instruction is output;

when the panel (100) is pressed by lateral pressure, no touch instruction is output.

11. A pressure detection method applied to the pressure detection apparatus (20) according to claim 6, the method comprising:

acquiring the first differential input signal and the second differential input signal;

determining whether to respond to a force of the panel (100) based on the first differential input signal and the second differential input signal.

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