CN108375431A - Pressure detection circuit, pressure detection method, pressure detecting module and display device - Google Patents
Pressure detection circuit, pressure detection method, pressure detecting module and display device Download PDFInfo
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- CN108375431A CN108375431A CN201810161437.1A CN201810161437A CN108375431A CN 108375431 A CN108375431 A CN 108375431A CN 201810161437 A CN201810161437 A CN 201810161437A CN 108375431 A CN108375431 A CN 108375431A
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- 238000001514 detection method Methods 0.000 title claims abstract description 92
- 238000004146 energy storage Methods 0.000 claims abstract description 27
- 230000035945 sensitivity Effects 0.000 claims description 35
- 238000007600 charging Methods 0.000 claims description 21
- 230000006698 induction Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
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Classifications
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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
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/08—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor
Abstract
A kind of pressure detection circuit of present invention offer, pressure detection method, pressure detecting module and display device.Pressure detection circuit includes pressure detecting output end, piezoelectricity sensing unit, piezoelectric signal converting unit, current mirror, energy-storage units and output control unit, the output end of current mirror and the first end of energy-storage units connect, and the second end of the energy-storage units is connect with the first level input；The control terminal of output control unit is connect with corresponding line gating line, the connection between output end and the pressure detecting output end of the output control unit for controlling the current mirror that is turned on or off under the control of the corresponding line gating line.Present invention may apply to the detections of the multipoint pressure of array.
Description
Technical field
The present invention relates to technical field of pressure detection more particularly to a kind of pressure detection circuit, pressure detection method, pressure
Detect module and display device.
Background technology
Existing pressure detection circuit includes piezoelectricity sensing unit, storage capacitance and switching transistor, the switching transistor
Grid connect with the piezoelectricity sensing unit, also pass through resistance by the grid of the switching transistor and access a DC voltage
Source, to provide a bias voltage for the grid of the switching transistor.The drain electrode of the switching transistor is accessed high by resistance
Voltage VDD, the source electrode ground connection of the switching transistor；The first end of the storage capacitance is connect with the grid of the switching transistor, should
The other end of storage capacitance is grounded.When piezoelectricity sensing unit receives pressure, the grid voltage of the switching transistor can moment
Generate a surging so that the drain-source current Ids of the switching transistor changes with writing, and is exported to the drain electrode of the switching transistor
Voltage also therefore generate variation.Existing pressure detection circuit is only applicable to examine in real time due to that cannot maintain pressure sensitivity information
It surveys on the framework of single pressure sensitivity, if but in the case of there are multiple pressure sensitivity units, such as the multipoint pressure of array detects, just
Need the mode that pressure sensitivity information can be maintained.
Invention content
The main purpose of the present invention is to provide a kind of pressure detection circuit, pressure detection method, pressure detecting module and
Display device solves existing pressure detection circuit and is suitable for detecting in real time on the framework of single pressure sensitivity, may not apply to array
The problem of formula multipoint pressure detects.
In order to achieve the above object, the present invention provides a kind of pressure detection circuits, including pressure detecting output end, piezoelectricity
Sensing unit, piezoelectric signal converting unit, current mirror, energy-storage units and output control unit, wherein
The piezoelectricity sensing unit is used for induction pressure, and pressure signal is converted to piezoelectric signal, and passes through voltage inductance
Output end is answered to export the piezoelectric signal；
The input terminal of the piezoelectric signal converting unit answers output end to connect with the voltage inductance, the piezoelectric signal conversion
The output end of unit is connect with the input terminal of the current mirror, and the piezoelectric signal converting unit is used to turn the piezoelectric signal
It is changed to corresponding pressure sensitivity current signal, and the pressure sensitivity current signal is exported by the output end；
The output end of the current mirror is connect with the first end of the energy-storage units, the second end of the energy-storage units and the
One level input connects；
The control terminal of the output control unit is connect with corresponding line gating line, and the output control unit is used for described
Control is turned on or off between the output end and the pressure detecting output end of the current mirror under the control of corresponding line gating line
Connection.
When implementation, the pressure signal converting unit includes：
Pressure signal conversioning transistor, grid answer output end to connect with the voltage inductance, the first pole and the current mirror
Input terminal connects, and the second pole is connect with second electrical level input terminal；And
Bias voltage provides resistance, first end and direct current press bond, second end and the pressure signal conversion crystal
The grid of pipe connects；
The piezoelectricity sensing unit is including the first pole plate, the second pole plate and is located at first pole plate and second pole plate
Between piezoelectric material layer；
First pole plate is connect with third level input, and second pole plate answers output end to connect with the voltage inductance
It connects.
When implementation, the current mirror includes input transistors and output transistor, wherein
The grid of the input transistors is connect with the grid of the output transistor, the first pole of the input transistors
All connect with first voltage input terminal with the first pole of the output transistor, the second pole of the input transistors with it is described defeated
Enter the grid connection of transistor；The input terminal of the extremely described current mirror of the second of the input transistors；
The output end of the extremely described current mirror of the second of the output transistor；
The energy-storage units include：Holding capacitor, first end are connect with the output end of the current mirror, second end with it is described
First level input connects；
The output control unit includes：Output control transistor, grid are connect with the corresponding line gating line, the first pole
It is connect with the output end of the current mirror, the second pole is connect with the pressure detecting output end.
When implementation, pressure detection circuit of the present invention further includes mirrored transistor and mirror image resistance, wherein
The first end of the mirror image resistance and the direct current press bond；
The grid of the mirrored transistor is connect with the second end of the mirror image resistance, the first pole of the mirrored transistor
It is connect with the output end of the current mirror, the second pole of the mirrored transistor is connect with the second electrical level input terminal；
The resistance value of the mirror image resistance is equal to the resistance value that the bias voltage provides resistance；
The breadth length ratio of the mirrored transistor is equal to the breadth length ratio of the pressure signal conversioning transistor；
The output end that the current value of the pressure sensitivity current signal of the input terminal input of the current mirror is equal to the current mirror is defeated
The current value of the charging current signal gone out；
The mirrored transistor and the pressure signal conversioning transistor are all n-type transistor, alternatively, the mirror image crystal
Pipe and the pressure signal conversioning transistor are all p-type transistor.
When implementation, pressure detection circuit of the present invention further includes：Pressure sensing cell is exported with the pressure detecting
End connection, the voltage signal for being exported according to the pressure detecting output end detect whether the piezoelectricity sensing unit senses
Pressure, and the pressure value of the pressure is detected when detecting that the piezoelectricity sensing unit senses pressure according to the voltage signal.
The present invention also provides a kind of pressure detection methods, are applied to above-mentioned pressure detection circuit, the pressure detecting
Method includes：
In a pressure detecting stage, pressure signal is converted to piezoelectric signal, and passed through by piezoelectricity sensing unit induction pressure
Voltage inductance answers output end to export the piezoelectric signal；The piezoelectric signal is converted to corresponding pressure sensitivity by piezoelectric signal converting unit
Current signal, and the pressure sensitivity current signal is exported to the input terminal of current mirror；The current mirror will be inputted by its input terminal
Pressure sensitivity current signal is converted to charging current signal；The current mirror exports the charging current signal to institute by its output end
The first end for stating energy-storage units, to be charged for the energy-storage units by the charging current signal；Output control unit is in phase
Control the connection between the output end and pressure detecting output end of the current mirror should be disconnected under the control of row gating line；
It carves at the time of reading, the output control unit controls the conducting electric current under the control of the corresponding line gating line
Connection between the output end and pressure detecting output end of mirror；
The reading moment is tight with the finish time in the pressure detecting stage after being set to the pressure detecting stage
At the time of adjacent.
When implementation, pressure detection method of the present invention further includes：It carves at the beginning, output control unit control conducting
Connection between the output end and pressure detecting output end of the current mirror resets the current potential of the output end of the current mirror
For initial voltage；
The initial time be before being set to the pressure detecting stage with the pressure detecting stage at the beginning of
Carve close at the time of.
When implementation, the pressure detection circuit further includes pressure sensing cell；The pressure detection method further includes：
The pressure sensing cell is detected according to the voltage signal that the pressure detecting output end exports at the reading moment
Whether the piezoelectricity sensing unit senses pressure, and when detecting that the piezoelectricity sensing unit senses pressure according to the voltage
The pressure value of the signal detection pressure.
The present invention also provides a kind of pressure detecting module, including multirow gating line, multiple row read line and array arrangement
The above-mentioned pressure detection circuit of multiple lines and multiple rows；
The control terminal for the output control unit that pressure detection circuit positioned at same a line includes with gating line described in a line
Connection；
The pressure detecting output end that pressure detection circuit positioned at same row includes is connect with read line described in same row.
The present invention also provides a kind of display devices, including above-mentioned pressure detecting module.
Compared with prior art, pressure detection circuit of the present invention, pressure detection method, pressure detecting module and aobvious
Showing device can be applicable not only to the case where examinations single point pressure detecting, more can be adapted for the multipoint pressure of array
It detects (since pressure detection circuit of the present invention can maintain the piezoelectric signal that voltage inductance answers cell translation to obtain).
Description of the drawings
The structure chart of pressure detection circuit described in Fig. 1 embodiment of the present invention；
Fig. 2 is the structure chart of the pressure detection circuit described in another embodiment of the present invention；
Fig. 3 is the structure chart of the pressure detection circuit described in further embodiment of this invention；
Fig. 4 is the circuit diagram of the first specific embodiment of pressure detection circuit of the present invention；
Fig. 5 is the voltage of the first specific embodiment output node B at work of pressure detection circuit of the present invention
(horizontal axis in Fig. 5 is time t) to the schematic diagram of the drain-source current Ids of VB and T1；
Fig. 6 is the circuit diagram of the first specific embodiment of pressure detection circuit of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the pressure detection circuit described in the embodiment of the present invention includes pressure detecting output end vo u, voltage inductance
Answer unit 11, piezoelectric signal converting unit 12, current mirror 13, energy-storage units 14 and output control unit 15, wherein
The piezoelectricity sensing unit 11 is used for induction pressure, and pressure signal is converted to piezoelectric signal, and passes through piezoelectricity
Inductive output end exports the piezoelectric signal；The voltage inductance answers output end to be connect with piezoelectricity node FD；
The input terminal of the piezoelectric signal converting unit 12 answers output end to connect (that is, the piezoelectricity with the voltage inductance
The input terminal of signal conversion unit 12 is connect with the piezoelectricity node FD), the output end of the piezoelectric signal converting unit 12 with
The input terminal of the current mirror 13 connects, and the piezoelectric signal converting unit 12 is for being converted to accordingly the piezoelectric signal
Pressure sensitivity current signal, and the pressure sensitivity current signal is exported by the output end；
The input terminal of the current mirror 13 is connect with input node A, and output end and the output node B of the current mirror 13 connect
It connects；
The output end of the current mirror 13 connect that (namely the current mirror 13 is defeated with the first end of the energy-storage units 14
Outlet is connect with the output node B), the second end of the energy-storage units 14 is connect with the first level input VI1；
The control terminal of the output control unit 15 is connect with corresponding line gating line SEL, and the output control unit 15 is used
The output end and the pressure that the current mirror 13 that is turned on or off is controlled under the control in the corresponding line gating line SEL are examined
Survey the connection between output end vo u.
In the specific implementation, the first level input VI1 can be ground terminal, or low-level input, but
It is not limited, in practical operation, the voltage value of the first level of VI1 inputs can be selected according to actual conditions.
Pressure detection circuit described in the embodiment of the present invention is by piezoelectricity sensing unit 11 by received pressure signal
Piezoelectric signal is converted to, which is converted to by corresponding pressure sensitivity current signal by piezoelectric signal converting unit 12, and
The pressure sensitivity current signal is input to the input terminal of the current mirror 13, the charging current exported by the output end of current mirror 13
Signal charges to the energy-storage units 14, so as to maintain pressure together by the energy-storage units 14 and the current mirror 13
The piezoelectric signal that electric induction unit 11 is obtained in pressure detecting phase transition, quarter, (the reading moment was to be set at the time of reading
After the pressure detecting stage with finish time in the pressure detecting stage close at the time of), output control unit 15 is in phase
Should under the control of row gating line SEL the output end and pressure detecting output end of control conducting electric current mirror 13 connection, according to described
The voltage signal that pressure detecting output end exports at the reading moment judges that the voltage inductance described in the pressure detecting stage is answered
Whether unit 11 senses pressure.
Pressure detection circuit described in the embodiment of the present invention can be applicable not only to examinations single point pressure detecting
Situation more can be adapted for the multipoint pressure detection of array (since the pressure detection circuit described in the embodiment of the present invention can be with
Maintain the piezoelectric signal that voltage inductance answers cell translation to obtain).
In pressure detection circuit described in the embodiment of the present invention, the pressure sensitivity inputted by the input terminal of the current mirror 13 is electric
It is in fixed ratio between the current value for the charging current signal that the output end of the current value and the current mirror 13 that flow signal exports
The output transistor that the breadth length ratio and the current mirror 13 for the input transistors that example, the ratio and the current mirror 13 include include
Breadth length ratio between ratio have relationship.
In practical operation, the piezoelectric signal that pressure signal is converted to by the piezoelectricity sensing unit 11 is voltage difference
Signal, when the piezoelectricity sensing unit 11 is under pressure, the voltage inductance of the piezoelectricity sensing unit answers the voltage that output end exports
It can change, the voltage inductance answers the bias voltage Vi that output end exports when which is not affected by pressure with the piezoelectricity sensing unit
Between voltage difference si be the piezoelectric signal, which is converted to pressure by the piezoelectric signal converting unit 12
Inducing current signal, and the pressure sensitivity current signal is exported to the input terminal of the current mirror 13.
In the specific implementation, the piezoelectricity sensing unit 11 can be piezoelectric transducer.
The embodiment of present invention pressure detection circuit as shown in Figure 1 at work, in a pressure detecting stage, voltage inductance
11 induction pressure of unit is answered, pressure signal is converted into piezoelectric signal, and answer output end to export the piezoelectricity by voltage inductance and believe
Number；The piezoelectric signal is converted to corresponding pressure sensitivity current signal by piezoelectric signal converting unit 12, and exports the pressure sensitivity electric current
Signal to current mirror 13 input terminal；The pressure sensitivity current signal inputted by its input terminal is converted to charging by the current mirror 13
Current signal；The current mirror 13 exports the charging current signal to the first of the energy-storage units 14 by its output end
End, to be charged for the energy-storage units 14 by the charging current signal；Output control unit 15 is in corresponding line gating line SEL
Control under control disconnect the connection between the output end and pressure detecting output end vo u of the current mirror；
It carves at the time of reading, the output control unit 15 controls conducting institute under the control of the corresponding line gating line SEL
State the connection between the output end of current mirror 13 and pressure detecting output end vo u；
The reading moment is tight with the finish time in the pressure detecting stage after being set to the pressure detecting stage
At the time of adjacent.
Specifically, the pressure signal converting unit may include：
Pressure signal conversioning transistor, grid answer output end to connect with the voltage inductance, the first pole and the current mirror
Input terminal connects, and the second pole is connect with second electrical level input terminal；And
Bias voltage provides resistance, first end and direct current press bond, second end and the pressure signal conversion crystal
The grid of pipe connects；
The piezoelectricity sensing unit may include the first pole plate, the second pole plate and be located at first pole plate and described second
Piezoelectric material layer between pole plate；
First pole plate is connect with third level input, and second pole plate answers output end to connect with the voltage inductance
It connects.
In the specific implementation, the second electrical level input terminal can be ground terminal, or low-level input, but not with
This is limited, and in practical operation, the voltage value of the second electrical level of the second electrical level input terminal input can be according to actual conditions
It is selected；
In the specific implementation, the third level input can be ground terminal, or low-level input, but not with
This is limited, and in practical operation, the voltage value of the third level of the third level input input can be according to actual conditions
It is selected.
In the specific implementation, as shown in Fig. 2, the pressure signal converting unit 12 may include：
Pressure signal conversioning transistor T1, grid and the voltage inductance answer output end to connect (namely the grid and piezoelectricity of T1
Node FD connections), source electrode is connect (namely the source electrode of T1 is connect with input node A) with the input terminal of the current mirror, drain electrode with
Ground terminal GND connections (in the embodiment shown in Figure 2, second electrical level input terminal is ground terminal GND)；And
Bias voltage provides resistance Z, first end and input direct-current voltage VDCDirect current press bond, second end with it is described
The grid of pressure signal conversioning transistor T1 connects；
The piezoelectricity sensing unit 11 is including the first pole plate, the second pole plate and is located at first pole plate and second pole
Piezoelectric material layer between plate；In practical operation, the piezoelectric material layer can be made of piezoelectric ceramics, but not as
Limit；
First pole plate connects with ground terminal GND (in the embodiment shown in Figure 2, third level input is ground terminal GND)
Connect, second pole plate and the voltage inductance answer output end to connect (namely second pole plate connects with the piezoelectricity node FD
It connects).
In the embodiment shown in Figure 2, for example, in practical operation by taking T1 is n-type transistor as an example, T1 can also
For p-type transistor, type of T1 is not construed as limiting at this.
T0 is carved at the beginning, and the piezoelectricity sensing unit 11 does not receive pressure, the direct current pressure side and bias electricity
Pressure provides resistance Z and provides bias voltage Vi for the grid of the pressure signal conversioning transistor T1, so that T1 works in amplification
Area, bias voltage Vi can so that the initial drain-source current of T1 is i0 at this time, and the voltage of output node B can pass through output at this time
Control unit 15 is reset to initial voltage V0, and (output section is connected in output control unit 15 under the control of corresponding line gating line SEL
Connection between point B and pressure detecting output end vo u, initial voltage V0 is reset to by the voltage of output node B).
According to a kind of specific implementation mode, the current mirror may include input transistors and output transistor, wherein
The grid of the input transistors is connect with the grid of the output transistor, the first pole of the input transistors
All connect with first voltage input terminal with the first pole of the output transistor, the second pole of the input transistors with it is described defeated
Enter the grid connection of transistor；The input terminal of the extremely described current mirror of the second of the input transistors；
The output end of the extremely described current mirror of the second of the output transistor.
Specifically, the energy-storage units may include：Holding capacitor, first end are connect with the output end of the current mirror,
Second end is connect with first level input；
The output control unit may include：Output control transistor, grid are connect with the corresponding line gating line, the
One pole is connect with the output end of the current mirror, and the second pole is connect with the pressure detecting output end.
Preferably, the pressure detection circuit described in the embodiment of the present invention can also include mirrored transistor and mirror image resistance,
Wherein,
The first end of the mirror image resistance and the direct current press bond；
The grid of the mirrored transistor is connect with the second end of the mirror image resistance, the first pole of the mirrored transistor
It is connect with the output end of the current mirror, the second pole of the mirrored transistor is connect with the second electrical level input terminal；
The resistance value of the mirror image resistance is equal to the resistance value that the bias voltage provides resistance；
The breadth length ratio of the mirrored transistor is equal to the breadth length ratio of the pressure signal conversioning transistor；
The output end that the current value of the pressure sensitivity current signal of the input terminal input of the current mirror is equal to the current mirror is defeated
The current value of the charging current signal gone out；
The mirrored transistor and the pressure signal conversioning transistor are all n-type transistor, alternatively, the mirror image crystal
Pipe and the pressure signal conversioning transistor are all p-type transistor.
On the basis of pressure detection circuit shown in Fig. 2, as shown in figure 3, described in a preferred embodiment of the invention
Pressure detection circuit can also include mirrored transistor T5 and mirror image resistance ZJ, wherein
The first end of the mirror image resistance ZJ and the direct current press bond；The direct current pressure side is used for input direct-current
Voltage VDC；
The grid of the mirrored transistor T5 is connect with the second end of the mirror image resistance ZJ, the mirrored transistor T5's
Source electrode is connect with the output end of the current mirror 13, and the drain electrode of the mirrored transistor T5 is connect with ground terminal GND；
The resistance value of the mirror image resistance ZJ is equal to the resistance value that the bias voltage provides resistance Z；
The breadth length ratio of the mirrored transistor T5 is equal to the breadth length ratio of the pressure signal conversioning transistor T1；
The current value of the pressure sensitivity current signal of the input terminal input of the current mirror 13 is equal to the output of the current mirror 13
Hold the current value of the charging current signal of output；
The mirrored transistor T5 and pressure signal conversioning transistor T1 is n-type transistor.
The preferred embodiment of present invention pressure detection circuit as shown in Figure 3 is by using mirror image resistance ZJ and mirror image crystal
Pipe T5, carries out the elimination of bias electric current using newly-increased T5 and ZJ, and the variable-current directly generated by pressure sensitivity is toward energy-storage units
14 chargings, can simplify calculating.
Specifically, the pressure detection circuit described in the embodiment of the present invention can also include：Pressure sensing cell, with the pressure
Power detection output connects, and the voltage signal for being exported according to the pressure detecting output end detects the piezoelectricity sensing unit
Whether sense pressure, and the pressure is detected according to the voltage signal when detecting that the piezoelectricity sensing unit senses pressure
Pressure value.
In practical operation, the pressure detection circuit described in the embodiment of the present invention can also include pressure sensing cell, should
Voltage signal induction pressure that pressure sensing cell is exported according to pressure detecting output end and the pressure value for calculating the pressure, specifically
How the course of work of the first specific embodiment of the pressure detection circuit below calculations incorporated illustrates.
Illustrate pressure detection circuit of the present invention below by two specific embodiments.
As shown in figure 4, the first specific embodiment of pressure detection circuit of the present invention includes pressure detecting output end
Vou, piezoelectricity sensing unit 11, piezoelectric signal converting unit 12, current mirror 13, energy-storage units 14, output control unit 15 and pressure
Power detection unit (is not shown) in Fig. 4, wherein
The piezoelectricity sensing unit 11 is including the first pole plate, the second pole plate and is located at first pole plate and second pole
Piezoelectric material layer between plate；
First pole plate is connect with ground terminal GND, and second pole plate answers output end to connect with the voltage inductance；The pressure
Electric induction output end is connect with piezoelectricity node FD；
The pressure signal converting unit 12 includes：
Pressure signal conversioning transistor T1, grid and the voltage inductance answer output end to connect (namely the grid and piezoelectricity of T1
Node FD connections), source electrode is connect with the input terminal of the current mirror 13, and drain electrode is connect with ground terminal GND；And
Bias voltage provides resistance Z, first end and direct current press bond, second end and the pressure signal conversion crystal
The grid of pipe T1 connects；The direct current pressure side is used for input direct-current voltage VDC；
The current mirror 13 includes input transistors T2 and output transistor T3, wherein
The grid of the input transistors T2 is connect with the grid of the output transistor T3, the input transistors T2's
The source electrode of source electrode and the output transistor is all connect with the high voltage input terminal of high input voltage VDD, the input transistors
The drain electrode of T2 is connect with the grid of the input transistors T2；The drain electrode of the input transistors T2 is the defeated of the current mirror 13
Enter end；
The drain electrode of the output transistor T3 is the output end of the current mirror 13；
The energy-storage units 14 include：Holding capacitor CH, first end are connect with the drain electrode of the output transistor T3, and second
End is connect with ground terminal GND；
The output control unit 15 includes：Output control transistor is same, and grid connects with the corresponding line gating line SEL
It connects, source electrode is connect with the drain electrode of the output transistor T3, and drain electrode is connect with the pressure detecting output end vo u.
In first specific embodiment of pressure detection circuit shown in Fig. 4, the drain electrode of the input transistors T2 with it is defeated
Ingress A connections, the drain electrode of the output transistor T3 are connect with output node B.
In first specific embodiment of pressure detection circuit shown in Fig. 4, T1, T2, T3 and T4 are n-type transistor,
But in practical operation, transistor as above may be p-type transistor, is not construed as limiting to the type of transistor at this.
In first specific embodiment of pressure detection circuit shown in Fig. 4, the input terminal input of the current mirror 13
The current value of pressure sensitivity current signal be equal to the current mirror 13 output end export charging current signal current value, herein with
The mirror image of the current mirror 13 is equal to for 1 than coefficient for example, in practical operation, and the mirror image of the current mirror 13 is than system
Number can also be equal to other values.
In first specific embodiment of pressure detection circuit shown in Fig. 4, the first level input, second electrical level input
End and third level input are all ground terminal GND.
As shown in figure 5, the first specific embodiment of present invention pressure detection circuit as shown in Figure 4 is at work,
T0 is carved at the beginning, and piezoelectricity sensing unit 11 does not receive pressure, and direct voltage source is provided by the grid of Z-direction T1
Bias voltage Vi, so that T1 works in amplification region, it is initial drain-source current i0 to make the drain-source current of T1, and SEL controls T4 conductings,
And the voltage VB of output node B is reset to initial voltage V0；
Into the pressure detecting stage,
The pressure detecting stage at the beginning when (namely from initial time t0 to the first moment t1), piezoelectricity sensing unit 11
It is not affected by pressure, therefore the T2 and T3 that the drain-source current of T1 includes by current mirror 13 is transmitted to output node B, to holding capacitor
CH charges；
When piezoelectricity sensing unit 11 is under pressure (in from the first moment t1 to the period of the second moment t2, voltage inductance
Unit 11 is answered to be under pressure), the voltage of the grid of T1 starts to reduce, and the drain-source current of T1 can be made to change, at first
T1 is carved, the drain-source current of T1 is the first drain-source current i1；From the first moment t1 to the second moment t2, the drain-source current of T1 is first gradual
It is reduced to reversed peak source stream electric current ipeak, (ipeak is the drain-source current of T1 when the grid voltage of T1 reaches minimum value),
It is gradually risen again from ipeak, then in the second moment t2, the drain-source current of T1 rises to the second drain-source current i2 (electricity of i2 again
Flow valuve is equal to the current value of i0)；The voltage VB of output node is in the period (from the first moment t1 to the time of the second moment t2
Section) in gradually rise, in the first moment t1, VB is equal to the first output voltage V1；At the second moment, VB is equal to the second output voltage
V2；
In period before from the second moment t2 to third moment t3, piezoelectricity sensing unit 11 is not affected by pressure, T1's
Drain-source current is almost unchanged, and VB is gradually increasing；It is third drain-source current i3 in the drain-source current of third moment t3, T1, VB is equal to
Third output voltage；Third moment t3 is to read the moment, and the reading of the voltage of output node B is carried out at third moment t3
(this read action can be connected by T4, and by the voltage output of output node B to Vou), can so judge from initial time
Whether the piezoelectricity sensing unit 11 is under pressure between t0 to third moment t3 (namely reading the moment), without because reading the moment
Not the period between the first moment t1 to the second moment t2 and be mistaken for the piezoelectricity sensing unit 11 and be not pressed.
Specifically, the first specific embodiment of present invention pressure sensing cell as shown in Figure 4 is at work, pressure detecting
Unit (being not shown in Fig. 4) can subtract V3 (i0 × T0/C), the voltage of Vou outputs be removed direct current signal, wherein T0
For the period duration from t0 to t3, C is the capacitance of CH.When from t0 to t3, there is no pressure to be applied in voltage inductance
When answering on unit 11, V3-V0 should be equal to (i0 × T0/C), and the pressure sensing cell compares V3-V0 and (i0 × T0/C), when
When the absolute value of voltage difference between V3-V0 and (i0 × T0/C) is more than predetermined voltage difference, the pressure sensing cell is sentenced
Break within the period from t0 to t3, there are pressure to be applied in the piezoelectricity sensing unit 11.
First specific embodiment of pressure detection circuit of the present invention since piezoelectric signal can be maintained,
It can wait until to be acquired (reading) again after a certain period of time, that is, it is suitable for use on pressure sensitivity pel array, using line by line
Acquisition mode, the piezoelectric signal of entire array is remained behind, without lose transient state information.Further, since to described
The power that piezoelectricity sensing unit 11 presses is bigger, and the voltage value of available V3 is bigger, therefore pressure of the present invention is examined
First specific embodiment of slowdown monitoring circuit can utilize in the pressure value of rough detection pressure.
As shown in fig. 6, on the basis of the first specific embodiment of pressure detection circuit as shown in Figure 4 of the invention, this
Second specific embodiment of the invention pressure detection circuit further includes mirrored transistor T5 and mirror image resistance ZJ, wherein
The first end of the mirror image resistance ZJ and the direct current press bond；The direct current pressure side is used for input direct-current
Voltage VDC；
The grid of the mirrored transistor T5 is connect with the second end of the mirror image resistance ZJ, the mirrored transistor T5's
Source electrode is connect with the output node B, and the drain electrode of the mirrored transistor T5 is connect with the ground terminal GND；
The resistance value of the mirror image resistance ZJ is equal to the resistance value that the bias voltage provides resistance Z；
The breadth length ratio of the mirrored transistor T5 is equal to the breadth length ratio of the pressure signal conversioning transistor T1；
The current value of the pressure sensitivity current signal of the input terminal input of the current mirror 13 is equal to the output of the current mirror 13
Hold the current value of the charging current signal of output；
The mirrored transistor T5 and pressure signal conversioning transistor T1 is n-type transistor.
At work, direct voltage source passes through second specific embodiment of present invention pressure detection circuit as shown in FIG. 6
ZJ provides bias voltage Vi to the grid of T5, so that the drain-source current of T5 is equal to i0, is then carved at the time of reading through conducting
The voltage value that T4 is sent to Vou subtracts (i0 × T0/C) equal to V3, wherein T0 is the period duration from t0 to t3, C
For the capacitance of CH；The voltage of the outputs of Vou in this way is to eliminate the voltage after direct current signal, can simplify calculating.
Pressure detection method described in the embodiment of the present invention is applied to above-mentioned pressure detection circuit, the pressure detecting
Method includes：
In a pressure detecting stage, pressure signal is converted to piezoelectric signal, and passed through by piezoelectricity sensing unit induction pressure
Voltage inductance answers output end to export the piezoelectric signal；The piezoelectric signal is converted to corresponding pressure sensitivity by piezoelectric signal converting unit
Current signal, and the pressure sensitivity current signal is exported to the input terminal of current mirror；The current mirror will be inputted by its input terminal
Pressure sensitivity current signal is converted to charging current signal；The current mirror exports the charging current signal to institute by its output end
The first end for stating energy-storage units, to be charged for the energy-storage units by the charging current signal；Output control unit is in phase
Control the connection between the output end and pressure detecting output end of the current mirror should be disconnected under the control of row gating line；
It carves at the time of reading, the output control unit controls the conducting electric current under the control of the corresponding line gating line
Connection between the output end and pressure detecting output end of mirror；
The reading moment is tight with the finish time in the pressure detecting stage after being set to the pressure detecting stage
At the time of adjacent.
Pressure detection method described in the embodiment of the present invention further includes：It carves at the beginning, output control unit control conducting
Connection between the output end and pressure detecting output end of the current mirror resets the current potential of the output end of the current mirror
For initial voltage；
The initial time be before being set to the pressure detecting stage with the pressure detecting stage at the beginning of
Carve close at the time of.
Specifically, the pressure detection circuit further includes pressure sensing cell；The pressure detection method further includes：
The pressure sensing cell is detected according to the voltage signal that the pressure detecting output end exports at the reading moment
Whether the piezoelectricity sensing unit senses pressure, and when detecting that the piezoelectricity sensing unit senses pressure according to the voltage
The pressure value of the signal detection pressure.
Pressure detecting module described in the embodiment of the present invention includes the more of multirow gating line, multiple row read line and array arrangement
The above-mentioned pressure detection circuit of row multiple row；
The control terminal for the output control unit that pressure detection circuit positioned at same a line includes with gating line described in a line
Connection；
The pressure detecting output end that pressure detection circuit positioned at same row includes is connect with read line described in same row.
Display device described in the embodiment of the present invention includes above-mentioned pressure detecting module.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of pressure detection circuit, which is characterized in that turn including pressure detecting output end, piezoelectricity sensing unit, piezoelectric signal
Change unit, current mirror, energy-storage units and output control unit, wherein
The piezoelectricity sensing unit is used for induction pressure, and pressure signal is converted to piezoelectric signal, and is answered by voltage inductance defeated
Outlet exports the piezoelectric signal；
The input terminal of the piezoelectric signal converting unit answers output end to connect with the voltage inductance, the piezoelectric signal converting unit
Output end connect with the input terminal of the current mirror, the piezoelectric signal converting unit is for being converted to the piezoelectric signal
Corresponding pressure sensitivity current signal, and the pressure sensitivity current signal is exported by the output end；
The output end of the current mirror is connect with the first end of the energy-storage units, the second end of the energy-storage units and the first electricity
Flat input terminal connection；
The control terminal of the output control unit is connect with corresponding line gating line, and the output control unit is used for described corresponding
The company between the output end and the pressure detecting output end for the current mirror that is turned on or off is controlled under the control of row gating line
It connects.
2. pressure detection circuit as described in claim 1, which is characterized in that the pressure signal converting unit includes：
Pressure signal conversioning transistor, grid answer output end to connect with the voltage inductance, the input of the first pole and the current mirror
End connection, the second pole is connect with second electrical level input terminal；And
Bias voltage provides resistance, first end and direct current press bond, second end and the pressure signal conversioning transistor
Grid connects；
The piezoelectricity sensing unit is including the first pole plate, the second pole plate and between first pole plate and second pole plate
Piezoelectric material layer；
First pole plate is connect with third level input, and second pole plate answers output end to connect with the voltage inductance.
3. pressure detection circuit as described in claim 1, which is characterized in that the current mirror includes input transistors and output
Transistor, wherein
The grid of the input transistors is connect with the grid of the output transistor, the first pole of the input transistors and institute
The first pole for stating output transistor is all connect with first voltage input terminal, and the second pole of the input transistors is brilliant with the input
The grid of body pipe connects；The input terminal of the extremely described current mirror of the second of the input transistors；
The output end of the extremely described current mirror of the second of the output transistor；
The energy-storage units include：Holding capacitor, first end are connect with the output end of the current mirror, second end and described first
Level input connects；
The output control unit includes：Output control transistor, grid are connect with the corresponding line gating line, the first pole and institute
The output end connection of current mirror is stated, the second pole is connect with the pressure detecting output end.
4. pressure detection circuit as claimed in claim 2, which is characterized in that further include mirrored transistor and mirror image resistance,
In,
The first end of the mirror image resistance and the direct current press bond；
The grid of the mirrored transistor is connect with the second end of the mirror image resistance, the first pole of the mirrored transistor and institute
The output end connection of current mirror is stated, the second pole of the mirrored transistor is connect with the second electrical level input terminal；
The resistance value of the mirror image resistance is equal to the resistance value that the bias voltage provides resistance；
The breadth length ratio of the mirrored transistor is equal to the breadth length ratio of the pressure signal conversioning transistor；
The current value of the pressure sensitivity current signal of the input terminal input of the current mirror is equal to the output end output of the current mirror
The current value of charging current signal；
The mirrored transistor and the pressure signal conversioning transistor are all n-type transistor, alternatively, the mirrored transistor and
The pressure signal conversioning transistor is all p-type transistor.
5. the pressure detection circuit as described in any claim in Claims 1-4, which is characterized in that further include：Pressure is examined
Unit is surveyed, is connect with the pressure detecting output end, the voltage signal for being exported according to the pressure detecting output end detects
Whether the piezoelectricity sensing unit senses pressure, and when detecting that the piezoelectricity sensing unit senses pressure according to the voltage
The pressure value of the signal detection pressure.
6. a kind of pressure detection method is applied to the pressure detection circuit as described in any claim in claim 1 to 5,
It is characterized in that, the pressure detection method includes：
In a pressure detecting stage, pressure signal is converted to piezoelectric signal, and passes through piezoelectricity by piezoelectricity sensing unit induction pressure
Inductive output end exports the piezoelectric signal；The piezoelectric signal is converted to corresponding pressure sensitivity electric current by piezoelectric signal converting unit
Signal, and the pressure sensitivity current signal is exported to the input terminal of current mirror；The pressure sensitivity that the current mirror will be inputted by its input terminal
Current signal is converted to charging current signal；The current mirror exports the charging current signal to the storage by its output end
The first end of energy unit, to be that the energy-storage units charge by the charging current signal；Output control unit is in corresponding line
Control disconnects the connection between the output end and pressure detecting output end of the current mirror under the control of gating line；
It carves at the time of reading, the output control unit controls the conducting current mirror under the control of the corresponding line gating line
Connection between output end and pressure detecting output end；
The reading moment is adjacent with the finish time in the pressure detecting stage after being set to the pressure detecting stage
Moment.
7. pressure detection method as claimed in claim 6, which is characterized in that further include：It carves at the beginning, output control unit
The connection between the output end and pressure detecting output end of the current mirror is connected in control, by the output end of the current mirror
Current potential resets to initial voltage；
The initial time be before being set to the pressure detecting stage with the pressure detecting stage at the beginning of carve it is tight
At the time of adjacent.
8. pressure detection method as claimed in claims 6 or 7, which is characterized in that the pressure detection circuit further includes pressure
Detection unit；The pressure detection method further includes：
Described in the voltage signal detection that the pressure sensing cell is exported according to the pressure detecting output end at the reading moment
Whether piezoelectricity sensing unit senses pressure, and when detecting that the piezoelectricity sensing unit senses pressure according to the voltage signal
Detect the pressure value of the pressure.
9. a kind of pressure detecting module, which is characterized in that the multirow including multirow gating line, multiple row read line and array arrangement is more
Arrange the pressure detection circuit as described in any claim in claim 1 to 6；
The control terminal for the output control unit that pressure detection circuit positioned at same a line includes is connect with gating line described in same a line；
The pressure detecting output end that pressure detection circuit positioned at same row includes is connect with read line described in same row.
10. a kind of display device, which is characterized in that including pressure detecting module as claimed in claim 9.
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| CN201810161437.1A CN108375431B (en) | 2018-02-26 | 2018-02-26 | Pressure detection circuit, pressure detection method, pressure detection module and display device |
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| CN201810161437.1A CN108375431B (en) | 2018-02-26 | 2018-02-26 | Pressure detection circuit, pressure detection method, pressure detection module and display device |
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| US11411161B2 (en) | 2019-12-25 | 2022-08-09 | Industrial Technology Research Institute | Piezoelectric sensing system and piezoelectric sensing circuit |
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| CN108375431B (en) | 2020-06-30 |
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