CN111147062B - Pressure sensor module, pressure detection device and terminal equipment - Google Patents
Pressure sensor module, pressure detection device and terminal equipment Download PDFInfo
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- CN111147062B CN111147062B CN202010059723.4A CN202010059723A CN111147062B CN 111147062 B CN111147062 B CN 111147062B CN 202010059723 A CN202010059723 A CN 202010059723A CN 111147062 B CN111147062 B CN 111147062B
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- leg
- panel
- pressure
- bridge arm
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/964—Piezo-electric touch switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
Abstract
The application provides a pressure sensor module, pressure detection device and terminal equipment, include: a full bridge circuit and a switching circuit. At least two bridge arms of the full-bridge circuit are arranged on the panel. The full-bridge circuit is used for sensing the stress of the panel. And the output end of the full-bridge circuit is electrically connected with the pressure signal detection circuit. The full-bridge circuit comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm. The switching circuit is electrically connected with the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm respectively. The switching circuit is used for controlling the full bridge circuit to switch between a first connection state and a second connection state. The first connection state is that the first bridge arm is electrically connected with the second bridge arm and the fourth bridge arm is electrically connected with the third bridge arm. The second connection state is that the first bridge arm is electrically connected with the fourth bridge arm and the second bridge arm is electrically connected with the third bridge arm.
Description
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 terminal device.
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 error identification
Disclosure of Invention
In view of the above, it is desirable to provide a pressure sensor module, a pressure detection device and a terminal device, which are capable of accurately identifying forward and lateral pressing signals and thus causing erroneous identification.
A pressure sensor module, comprising:
the pressure signal detection circuit comprises a panel, a full-bridge circuit, a pressure signal detection circuit and a control circuit, wherein at least two bridge arms of the full-bridge circuit are arranged on the panel and used for sensing stress of the panel, the output end of the full-bridge circuit is used for being electrically connected with the pressure signal detection circuit, and the full-bridge circuit comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm; and
the switching circuit is respectively electrically connected with the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm and is used for controlling the full bridge circuit to be switched between a first connection state and a second connection state;
the first connection state is that the first bridge arm is electrically connected with the second bridge arm and the fourth bridge arm is electrically connected with the third bridge arm, and the second connection state is that the first bridge arm is electrically connected with the fourth bridge arm and the second bridge arm is electrically connected with the third bridge arm.
In one embodiment, the first leg, the second leg, the third leg, and the fourth leg are located on a first surface or a second surface of the panel; alternatively, the first and second electrodes may be,
the first bridge arm and the second bridge arm are positioned on a first surface of the panel, and the third bridge arm and the fourth bridge arm are positioned on a second surface of the panel;
wherein the first surface is disposed opposite the second surface.
In one embodiment, the pressure sensor module further includes:
the first bridge arm and the second bridge arm are positioned on one side of the supporting component, and the third bridge arm and the fourth bridge arm are positioned on the other side of the supporting component; or
The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm are positioned on the same side of the support component;
the first bridge arm and the second bridge arm are provided with hollow structures at the vertical projection positions of the supporting parts.
In one embodiment, the first leg, the second leg, the third leg, and the fourth leg are force sensitive resistors.
In one embodiment, the first leg and the second leg are both force sensitive resistors, and the third leg and the fourth leg are both non-force sensitive resistors; alternatively, the first and second electrodes may be,
the first bridge arm and the second bridge arm are both non-force sensitive resistors, and the third bridge arm and the fourth bridge arm are both force sensitive resistors.
A pressure detection device, comprising the pressure sensor module set of any one of the above items; and
and the processor is electrically connected with the full-bridge circuit and the switching circuit respectively and used for controlling the switching circuit to switch the full-bridge circuit between the first connection state and the second connection state.
In one embodiment, when the processor controls the switching circuit to switch the full-bridge circuit to the first connection state, the full-bridge circuit is used for sensing pressure and generating a first differential input signal;
when the processor controls the switching circuit to switch the full-bridge circuit to the second connection state, the full-bridge circuit is used for sensing the pressure and generating a second differential input signal;
the processor is used for acquiring the first differential input signal and the second differential input signal and determining whether to respond to the stress of the full bridge circuit 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 magnitude of change is greater than the second magnitude of change, it is determined that the panel is being subjected to a positive pressure and the processor is responsive to the force being applied to the panel.
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 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 key signal is output;
when the panel is pressed by lateral pressure, no key signal is output.
A terminal device, comprising the pressure detection apparatus according to any one of the above embodiments.
Compared with the prior art, the pressure sensor module, the pressure detection device and the terminal device have the advantages that when the panel bears pressure, the switching circuit controls the full-bridge circuit to switch between the first connection state (namely, the first bridge arm is electrically connected with the second bridge arm, and the fourth bridge arm is electrically connected with the third bridge arm) and the second connection state (namely, the first bridge arm is electrically connected with the fourth bridge arm, and the second bridge arm is electrically connected with the third bridge arm), so that the full-bridge circuit senses the pressure and respectively generates a first differential input signal and a second differential input signal, and determines whether to respond to the stress of the panel based on the first differential input signal and the second differential input signal, and further the application can correctly identify forward and lateral pressing signals, avoid the phenomenon of misidentification, and further improve the reliability of identification.
Drawings
Fig. 1 is a schematic circuit diagram of a pressure sensor module according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a pressure sensor module according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit connection diagram of a full bridge circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit connection diagram of a full bridge circuit according to another embodiment of the present application;
fig. 5 is a first schematic structural diagram of a pressure sensor module according to another embodiment of the present disclosure;
fig. 6 is a second schematic structural diagram of a pressure sensor module according to another embodiment of the present disclosure;
FIG. 7 is a schematic block diagram of a circuit of a pressure detection device according to an embodiment of the present disclosure;
fig. 8 is a schematic block circuit diagram of a terminal device according to an embodiment of the present application.
10. Pressure sensor module
100. Panel board
20. Pressure detection device
21. Processor with a memory having a plurality of memory cells
200. Full bridge circuit
201. Positive reference voltage source
202. Negative reference voltage source
210. First bridge arm
220. Second bridge arm
230. Third bridge arm
240. Fourth bridge arm
30. Terminal device
300. Switching circuit
400. Support member
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. 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 and fig. 2, an embodiment of the present application provides a pressure sensor module 10, including: a full bridge circuit 200 and a switching circuit 300. At least two arms of the full bridge circuit 200 are disposed on the panel 100. The full bridge circuit 20 is used for sensing the stress of the panel 100. The output end of the full bridge circuit 200 is electrically connected to the pressure signal detection circuit. Full bridge circuit 200 includes a first leg 210, a second leg 220, a third leg 230, and a fourth leg 240.
In one embodiment, the arrangement of at least two legs of the full bridge circuit 200 on the panel 100 means that: when two legs of the full bridge circuit 200 are disposed on the panel 100, the remaining legs may be disposed on or outside the panel. For example, when the remaining legs are disposed outside the panel, the remaining legs may be disposed on the main board. That is, at least two arms of the full bridge circuit 200 are disposed on the panel 100, and the remaining arms can be disposed on the main board.
In one embodiment, the full bridge circuit 20 is used for sensing the stress of the panel 100 by: the full bridge circuit 20 senses the stress of the panel 100 through a bridge arm. Specifically, the full bridge circuit 20 may sense a stress of the panel 100 through the first leg 210 and the second leg 220. That is, first leg 210 and second leg 220 are both force sensitive resistors and third leg 230 and fourth leg 240 are both non-force sensitive resistors.
In one embodiment, the full bridge circuit 20 can also sense the stress of the panel 100 through the third leg 230 and the fourth leg 240. That is, third leg 230 and fourth leg 240 are both force sensitive resistors and first leg 210 and second leg 220 are both non-force sensitive resistors. In one embodiment, full bridge circuit 20 may also sense a force applied to panel 100 through first leg 210, second leg 220, third leg 230, and fourth leg 240. That is, in this case, first leg 210, second leg 220, third leg 230, and fourth leg 240 are all force sensitive resistors.
In one embodiment, first leg 210 and third leg 230 are each electrically coupled to a predetermined positive reference voltage source 201. The fourth bridge arm 240 and the second bridge arm 220 are both electrically connected to a preset negative reference voltage source 202. In one embodiment, the negative reference voltage source 202 may be grounded or not, and may be selected according to actual requirements.
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. In one embodiment, the panel 100 may also be made of a flexible material, for example, the panel 100 is a flexible circuit board. In one embodiment, at least two legs of the full bridge circuit 200 may be adhered or embedded on the panel 100. In one embodiment, the pressure signal detection circuit may employ a conventional signal detection circuit, such as a signal detector or the like.
It is understood that the specific circuit structure of the switching circuit 300 is not limited as long as it has the function of controlling the full bridge circuit 200 to switch between the first connection state and the second connection state. In one embodiment, the switching circuit 300 may be a multiplexer. In one embodiment, the switching circuit 300 may also employ a conventional switching circuit topology. The switching circuit 300 controls the full bridge circuit 200 to switch between a first connection state and a second connection state.
Specifically, the first connection state is: first leg 210 is electrically connected to second leg 220 and fourth leg 240 is electrically connected to third leg 230 (as shown in fig. 3). The second connection state is: first leg 210 is electrically coupled to fourth leg 240 and second leg 220 is electrically coupled to third leg 230 (shown in fig. 4).
In this embodiment, when the panel 100 bears a pressure, the switching circuit 300 controls the full-bridge circuit 200 to switch between a first connection state (that is, the first bridge arm 210 is electrically connected to the second bridge arm 220, and the fourth bridge arm 240 is electrically connected to the third bridge arm 230) and a second connection state (that is, the first bridge arm 210 is electrically connected to the fourth bridge arm 240, and the second bridge arm 220 is electrically connected to the third bridge arm 230), so that the full-bridge circuit 200 senses the pressure and generates a first differential input signal and a second differential input signal respectively, and determines whether to respond to the stress of the panel 100 based on the first differential input signal and the second differential input signal, thereby enabling the present embodiment to correctly recognize forward and lateral pressing signals, avoiding a false recognition phenomenon, and further improving reliability of recognition.
In one embodiment, first leg 210, second leg 220, third leg 230, and fourth leg 240 are located on a first surface or a second surface of panel 100. Alternatively, first leg 210 and second leg 220 are positioned on a first surface of panel 100 and third leg 230 and fourth leg 240 are positioned on a second surface of panel 100 (as shown in fig. 5). Wherein the first surface is disposed opposite the second surface.
In one embodiment, the positioning of first leg 210, second leg 220, third leg 230, and fourth leg 240 on a first surface or a second surface of panel 100 means that: first leg 210, second leg 220, third leg 230, and fourth leg 240 are located on either the top or bottom exterior surface of panel 100. That is, the first surface may be a top outer surface of the panel 100 and the second surface may be a bottom outer surface of the panel 100.
Referring to fig. 6, in an embodiment, the pressure sensor module 10 further includes: the member 400 is supported. The supporting member 400 is provided to the panel 100. First leg 210 and second leg 220 are positioned on one side of support member 400 and third leg 230 and fourth leg 240 are positioned on the other side of support member 400. Alternatively, first leg 210, second leg 220, third leg 230, and fourth leg 240 are positioned on the same side of support member 400. The first bridge arm 210 and the second bridge arm 220 are provided with hollow structures at vertical projections of the support member 400.
In one embodiment, the support member 400 is a rigid material, such as a metal plate, a glass plate, a plastic plate, an aluminum alloy plate, or other rigid material. In one embodiment, the support member 400 may also be a flexible material, such as foam or the like.
In one embodiment, the fact that the first leg 210 and the second leg 220 are provided with hollow structures at the vertical projection of the support member 400 means that: the first bridge arm 210 and the second bridge arm 220 are not solid at the vertical projection of the supporting member 400, that is, the hollowed-out structures are arranged at the projection, so that the supporting member 400 deforms when receiving pressure, and the full-bridge circuit 200 can sense the stress of the panel 100 and generate corresponding differential input signals. In one embodiment, the specific shape of the hollow structure is not limited as long as the supporting member 400 can be deformed when receiving a pressure.
In one embodiment, a plurality of (e.g., two) support members 400 may be spaced apart (as shown in fig. 6), and a gap may be formed. In one embodiment, first leg 210, second leg 220, third leg 230, and fourth leg 240 can be disposed in a gap with first leg 210 and second leg 220 positioned on a bottom exterior surface of support member 400 and third leg 230 and fourth leg 240 positioned on a top exterior surface of support member 400. With such a structure as described above, the support member 400 may be replaced with a rigid support member such as a metal plate, a glass plate, a plastic plate, an aluminum alloy plate, or other rigid support member.
Referring to fig. 7, 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 processor 21 is electrically connected to the full bridge circuit 100 and the switching circuit 300, respectively. The processor 21 is configured to control the switching circuit 300 to switch the full bridge circuit 200 between the first connection state and the second connection state.
In one embodiment, the specific circuit structure of the switching circuit 300 may adopt the structure described in the above embodiments. In one embodiment, the processor 21 may control the switching circuit 300 to switch the full bridge circuit 200 between the first connection state and the second connection state. Specifically, when the panel 100 receives a pressure, the processor 21 may control the switching circuit 300 to switch the full-bridge circuit 200 to the first connection state, and at this time, the full-bridge circuit 100 may be configured to sense the pressure and generate a first differential input signal, and send the first differential input signal to the processor 21.
The processor 21 can then control the switching circuit 300 to switch the full-bridge circuit 200 to the second connection state, in which the full-bridge circuit 100 is used to sense the pressure and generate a second differential input signal, and simultaneously transmit the second differential input signal to the processor 21. 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 stress of the full bridge circuit based on the first differential input signal and the second differential input signal. Specifically, the processor 21 may obtain the first differential input signal and the second differential input signal through the pressure signal detection circuit. That is, the pressure signal detection circuit may be integrated within the processor 21.
In one embodiment, the processor 21 may determine whether to respond to the force of the panel 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, assume that the resistance of first leg 210 is R11, the resistance of second leg 220 is R12, the resistance of third leg 230 is R13, and the resistance of fourth leg 240 is R14. Wherein R11, R12, R13 and R14 are all force sensitive resistors. As shown in fig. 6, when panel 100 is subjected to a pressure along Z axis (i.e. a positive force), assuming that the pressure is in a direction downward along Z axis, i.e. opposite to the direction of arrow on Z axis, force sensitive resistors along outer side of force receiving direction (i.e. first leg 210 and second leg 220) become larger due to tensile resistance value, force sensitive resistors along inner side of force receiving direction (i.e. third leg 230 and fourth leg 240) become smaller due to compressive resistance value, and then the changes of first differential input signal S1 and second differential input signal S2 can be obtained by the following formulas:
S1＝(S1+)-(S1-)＝VS*(R14/(R14+R11)-R12/(R13+R12))；
S2＝(S2+)-(S2-)＝VS*(R12/(R11+R12)-R14/(R13+R14))；
as can be seen from the above equation, R11 becomes larger, R14 becomes smaller, and the S1+ (representing the positive input of the first differential input signal) signal becomes smaller; r13 becomes small, R12 becomes large, and the S1- (representing the negative input of the first differential input signal) signal becomes large; i.e. S1 becomes smaller. That is, the first differential input signal changes significantly at this time. Since the ratio of R11 to R12 is large, it can be seen that the S2+ (representing the positive input of the second differential input signal) signal is substantially unchanged; since the ratio of R13, R14, etc. becomes small, it is known that the S2- (representing the negative input of the second differential input signal) signal is substantially unchanged; i.e. S2 is substantially unchanged. That is, the second differential input signal does not change significantly at this time.
From the above logic, the first differential input signal changes significantly and the second differential input signal does not change significantly when the panel 100 is subjected to pressure from the Z-axis. 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 changes significantly and the second differential input signal does not change significantly, the processor 21 responds to the force applied to the panel 100.
In one embodiment, the Z-axis pressure (i.e., positive force) refers to: a pressure perpendicular to the first surface of the panel 100. In one embodiment, the Z-axis pressure refers not only to a pressure perpendicular to the first surface of the panel 100, but also to a pressure at a predetermined angle with respect to the Z-axis. The preset included angle may range from 0 to 30 °.
When the panel 100 is subjected to a pressure (i.e., a lateral force) along a direction of an arrow of the Y axis (as shown in fig. 6), the force sensitive resistors along the outer side of the force receiving direction (i.e., the second bridge arm 220 and the fourth bridge arm 240) become larger in tensile resistance value, and the force sensitive resistors along the inner side of the force receiving direction (i.e., the first bridge arm 210 and the third bridge arm 230) become smaller in compressive resistance value, so that the changes of the first differential input signal S1 and the second differential input signal S2 can be obtained by the above formula. Specifically, as the ratio of R11 to R14 is large, the S1+ signal does not change significantly; r12 becomes small, R13 becomes small and S1-signaling is not obvious; i.e. S1 is substantially unchanged. That is, the first differential input signal does not change significantly at this time. The S2+ signal becomes smaller as R11 becomes larger and R12 becomes smaller; r13 becomes small, R14 becomes large, and the S2-signal becomes large; i.e. S2 becomes smaller. That is, the first differential input signal changes significantly at this time.
From the above logic, the first differential input signal does not change significantly and the second differential input signal does change significantly when the panel is subjected to pressure from the Y-axis. 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 does not change significantly and the second differential input signal does change significantly, the processor 21 does not respond to the force applied to the panel 100.
In one embodiment, the Y-axis pressure (i.e., lateral force) refers to: a pressure parallel to the first surface of the panel 100. In one embodiment, the pressure of the Y-axis may refer to not only the pressure parallel to the first surface of the panel 100 but also the pressure at a predetermined angle with respect to the Y-axis. The preset included angle may range from 0 to 30 °.
In this embodiment, when the panel 100 bears a pressure, the switching circuit 300 controls the full-bridge circuit 200 to switch between a first connection state (that is, the first bridge arm 210 is electrically connected to the second bridge arm 220, and the fourth bridge arm 240 is electrically connected to the third bridge arm 230) and a second connection state (that is, the first bridge arm 210 is electrically connected to the fourth bridge arm 240, and the second bridge arm 220 is electrically connected to the third bridge arm 230), so that the full-bridge circuit 200 senses the pressure and generates a first differential input signal and a second differential input signal respectively, and determines whether to respond to the stress of the panel 100 based on the first differential input signal and the second differential input signal, thereby enabling the present embodiment to correctly recognize a forward pressing signal and a lateral pressing signal, avoiding a false recognition phenomenon, and further improving 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 greater than the second variation amplitude, it is determined that the panel 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 variation is smaller 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. 8, another embodiment of the present application provides a terminal device 30, which includes the pressure detection apparatus 20 according to any one of the embodiments. In one embodiment, the terminal device 30 may be a mobile terminal such as a mobile phone and a tablet computer, a wearable device such as a bracelet, a watch and an earphone, and an electronic device such as an electronic scale, an intelligent toilet, a mobile power source and a household appliance.
In one embodiment, the pressure sensor module 10 may be disposed in a housing of the terminal device 30. For example, on the inner surface of the housing of the terminal device 30, to sense the pressure applied by the user to the housing of the terminal device 30. The processor 21 may be disposed in the housing or disposed outside the housing (inside the electronic device 30), which is not limited in this application.
In one embodiment, for a cell phone, the cell phone housing includes a center frame and a back cover. The pressure sensor module 10 in the pressure detection device 20 may be disposed on the middle frame or the rear cover of the mobile phone, and electrically connected to the processor inside the mobile phone, so as to implement a pressure touch function of the side frame of the mobile phone or a pressure touch function of the rear cover of the mobile phone.
The terminal device 30 described in this embodiment can determine whether to respond to the stress of the panel 100 through the pressure detection device 20, so that the present embodiment can correctly identify the forward and lateral pressing signals, avoid the phenomenon of misrecognition, and further improve the reliability of identification.
To sum up, this application when panel 100 bears the pressure, through switching circuit 300 control full-bridge circuit 200 switches between first connection state (promptly first bridge arm 210 with second bridge arm 220 electricity just fourth bridge arm 240 with third bridge arm 230 electricity) and second connection state (promptly first bridge arm 210 with fourth bridge arm 240 electricity just second bridge arm 220 with third bridge arm 230 electricity is connected), thereby makes full-bridge circuit 200 responds to pressure produces first difference input signal and second difference input signal respectively, and is based on first difference input signal with second difference input signal confirms whether to respond to panel 100's atress, and then makes this application correctly discern forward and side direction pressing signal, avoids the misidentification phenomenon, and then improves 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 (12)
1. A pressure sensor module, comprising:
the full-bridge circuit (200) comprises a panel (100), at least two bridge arms of the full-bridge circuit (200) are arranged on the panel (100) and used for sensing stress of the panel (100), the output end of the full-bridge circuit (200) is used for being electrically connected with a pressure signal detection circuit, and the full-bridge circuit (200) comprises a first bridge arm (210), a second bridge arm (220), a third bridge arm (230) and a fourth bridge arm (240); and
a switching circuit (300) electrically connected to the first leg (210), the second leg (220), the third leg (230) and the fourth leg (240), respectively, the switching circuit (300) being configured to control the full bridge circuit (200) to switch between a first connection state and a second connection state;
the first connection state is that the first leg (210) is electrically connected to the second leg (220) and the fourth leg (240) is electrically connected to the third leg (230), and the second connection state is that the first leg (210) is electrically connected to the fourth leg (240) and the second leg (220) is electrically connected to the third leg (230).
2. The pressure sensor module of claim 1, wherein first leg (210), second leg (220), third leg (230), and fourth leg (240) are each located on a first surface or a second surface of panel (100); alternatively, the first and second electrodes may be,
said first leg (210) and said second leg (220) are located on a first surface of said panel (100), and said third leg (230) and said fourth leg (240) are located on a second surface of said panel (100);
wherein the first surface is disposed opposite the second surface.
3. The pressure sensor module of claim 1, further comprising:
-a support member (400) arranged on said panel (100), said first leg (210) and said second leg (220) being positioned on one side of said support member (400), said third leg (230) and said fourth leg (240) being positioned on the other side of said support member (400); or
-said first leg (210), said second leg (220), said third leg (230) and said fourth leg (240) are located on the same side of said support member (400);
the first bridge arm (210) and the second bridge arm (220) are provided with hollow structures at the vertical projection position of the support component (400).
4. Pressure sensor module according to any one of claims 1 to 3, characterized in that said first leg (210), said second leg (220), said third leg (230) and said fourth leg (240) are all force sensitive resistors.
5. A pressure sensor module according to any one of claims 1 to 3, characterised in that first leg (210) and second leg (220) are both force sensitive resistors and third leg (230) and fourth leg (240) are both non-force sensitive resistors; alternatively, the first and second electrodes may be,
the first leg (210) and the second leg (220) are both non-force sensitive resistors, and the third leg (230) and the fourth leg (240) are both force sensitive resistors.
6. A pressure detection device, characterized by comprising a pressure sensor module (10) according to any one of claims 1-3; and
a processor (21) electrically connected to the full bridge circuit (200) and the switching circuit (300), respectively, for controlling the switching circuit (300) to switch the full bridge circuit (200) between the first connection state and the second connection state.
7. The pressure detection apparatus of claim 6, wherein when the processor (21) controls the switching circuit (300) to switch the full bridge circuit (200) in the first connection state, the full bridge circuit (200) is configured to sense pressure and generate a first differential input signal;
when the processor (21) controls the switching circuit (300) to switch the full-bridge circuit (200) in the second connection state, the full-bridge circuit (200) is used for sensing the pressure and generating a second differential input signal;
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 full bridge circuit based on the first differential input signal and the second differential input signal.
8. The pressure detection apparatus of claim 7, 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.
9. The pressure sensing device of claim 8, wherein if the first magnitude of change is greater than the second magnitude of change, it is determined that the panel (100) is being subjected to a positive pressure, and the processor (21) is responsive to the force being applied to the panel (100).
10. The pressure detection device of claim 9, wherein if the first magnitude of variation is less 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).
11. The pressure detection apparatus of claim 10, wherein the processor (21) is further configured to:
when the panel (100) is pressed by positive pressure, a key signal is output;
when the panel (100) is pressed by lateral pressure, no key signal is output.
12. A terminal device, characterized in that it comprises a pressure detection apparatus (20) according to claim 6.
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| CN202010059723.4A CN111147062B (en) | 2020-01-19 | 2020-01-19 | Pressure sensor module, pressure detection device and terminal equipment |
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| CN202010059723.4A CN111147062B (en) | 2020-01-19 | 2020-01-19 | Pressure sensor module, pressure detection device and terminal equipment |
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| JP4657806B2 (en) * | 2004-05-31 | 2011-03-23 | ヤマハ発動機株式会社 | Physical quantity detection device provided with bridge circuit and temperature compensation method |
| TW200740099A (en) * | 2006-04-13 | 2007-10-16 | Acbel Polytech Inc | Soft-switching phase-shifting full bridge circuit |
| WO2017133016A1 (en) * | 2016-02-06 | 2017-08-10 | 深圳纽迪瑞科技开发有限公司 | Pressure sensor, electronic device, and method for manufacturing pressure sensor |
| CN106020559B (en) * | 2016-06-30 | 2018-05-29 | 华为技术有限公司 | Pressure sensitive detection device, electronic equipment and touch display screen |
| CN107688405B (en) * | 2016-08-05 | 2020-06-16 | 华为技术有限公司 | Touch pressure sensing device and electronic product |
| WO2018133054A1 (en) * | 2017-01-21 | 2018-07-26 | 深圳纽迪瑞科技开发有限公司 | Pressure-sensing structure, and electronic product |
| WO2018145304A1 (en) * | 2017-02-10 | 2018-08-16 | 深圳市汇顶科技股份有限公司 | Piezoresistive sensor, pressure measurement device and electronic device |
| CN107340931B (en) * | 2017-08-31 | 2020-10-09 | 厦门天马微电子有限公司 | Display panel and display device |
| CN107911533B (en) * | 2017-10-23 | 2020-10-09 | 芯海科技（深圳）股份有限公司 | Method for realizing function keys of comprehensive under-screen mobile terminal |
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