CN101655399B - Array pressure sensing device and pressure identification method thereof - Google Patents
Array pressure sensing device and pressure identification method thereof Download PDFInfo
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- CN101655399B CN101655399B CN200810210866XA CN200810210866A CN101655399B CN 101655399 B CN101655399 B CN 101655399B CN 200810210866X A CN200810210866X A CN 200810210866XA CN 200810210866 A CN200810210866 A CN 200810210866A CN 101655399 B CN101655399 B CN 101655399B
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Abstract
The invention provides an array pressure sensing device, which is suitable for multi-point touch sensing and pressure quantization identification. The array pressure sensing device comprises a plurality of first axes, a plurality of second axes, a plurality of piezoresistive units, a third axis, a plurality of standard resistors and a control unit, wherein the second axes are in staggered arrangement with the first axes, and one piezoresistive unit is arranged between staggered positions of each first axis and each second axis; and the third axis is in staggered arrangement with the first axes, and one standard resistor is arranged between staggered positions of each first axis and the third axis. The invention also provides a pressure identification method realized by the array pressure sensing device. The pressure identification method is realized by a scanning driving flow of the control unit, and a pressure quantization gray scale identification method for a linear piezoresistive system is provided.
Description
Technical field
The invention relates to a kind of pressure-sensing device and pressure discrimination method, and particularly relevant for a kind of array pressure-sensing device and pressure discrimination method.
Background technology
Along with development of science and technology, pressure-sensing device gradually Application and Development in the middle of popular life.Such as Tekscan company the GTG pressure-sensing is applied to care and nursing identification and chair cushion pressure distribution sensing at home; The sense of touch quantification technique research of intelligence artificial bionic property electronics skin is suggested gradually; The electric resistance touch-control panel technology is gradually by commercialization, and the pressure perceptional function of the Wii Fit that multi-point touch (Multi Touch) function of mainly being released with Apple company in the application of consumer electronics and Nintendo are released is the international technology index.Therefore, large tracts of land multi-point touch, array, three-dimensional pressure identification technique will be the trends of the market of following care and nursing sensing at home and consumption electronic products.
Known with medical treatment or to analyze be that master's pressure-sensing device such as U.S. US5905209 patent and Taiwan TW351990 patent etc. disclose.In the TW351990 patent, it mainly is in a plurality of independently pressure-sensings of sole configuration unit, and each pressure-sensing unit respectively by the electric connection mode of complicacy to obtain pressure signal.With monopodia, this device will dispose the pressure-sensing unit more than 24 at least, and the complicated circuit framework that reads of arranging in pairs or groups.If need to strengthen the area of sensing, certainly will to dispose more pressure-sensing unit again, so can make hardware cost too expensive, sensing apparatus can't be applied to large-area manufacturing to satisfy the demands simultaneously.
In addition, like the disclosed technical scheme of U.S. US5010772 patent, it is made into the shape of mattress with the array type capacity sensing apparatus, with human pressure's on the induction mattress distribution.Yet; This turntable driving framework receives the influence of leakage current of the faint electric power storage of electric capacity itself easily and causes mistake detecting and the identification of array type capacity sensor when turntable driving; And the accuracy of electric signal corresponding pressure of amplifying sensing architecture through electric charge is low, and needs through the pairing pressure size of circuit corrective capacity variable quantity.
Known is that master's pressure-sensing device such as U.S. US5505072 patent is disclosed with the induction pressure multiple point touching; The dynamic response sweep circuit of this array pressure sensor; Utilize the FEEDBACK CONTROL of test signal and reference potential to realize the sensing circuit of different sensitivity and spatial resolution, and control test scan signal pin array formula pressure sensor operating space and do scanning motion.Structural deformation amount when the pressure drag sensor is stressed changes; Obtain the electric signal of indivedual sensors by the rear end sensing circuit; This electric signal is the change in voltage that produces through sensor resistance variations that structural deformation own causes, and aforesaid way is able to solve place, indivedual sensors place and distributes with sensor pressure gradient on every side.Yet this patent disclosed driving sensing circuit framework and rear end calculation method are too numerous and diverse, have more rear end pressure variety calculation delay issue.
Known disclosed with touch sensor and touch control device such as U.S. US5159159 patent; The two-dimensions coordinate setting of this touch sensor and the big or small sensing circuit of the pressure that bears; Be to utilize X axis and staggered array resistance sensing device and the intermediate course of Y axis to be resistance-variable branch pressure drag material, through deciding current drives scanning or deciding the driven scan mode and realize touching the sensing of locating with the identification of pressure GTG.Yet disclosed X axis of this patent and Y axis utilize in regular turn to be decided current drives scanning or decide the driven scan method and can't realizes that the resistance-type multiple point touching locatees, and the ability of the pressure GTG identification of multiple point touching.
Figure 1A is the decomposing schematic representation of a kind of electric resistance touch-control device of known technology.Please refer to Figure 1A, known array pressure-sensing device 100 mainly is made up of with a plurality of resistance units 130 of infrabasal plate 120 clampings upper substrate 110, and this array resistance contactor control device 100 is the structure for three-wire type.In addition, three horizontal X axis 112 are disposed on the upper substrate 110, and three longitudinally Y axis 122 be disposed on the infrabasal plate 120, and these nine pressure drag unit 130 are the resistance units that are disposed at X axis 112 and Y axis 122 confluces respectively.
But in the ordinary course of things, resistance unit normally the electricity group unit 130 ' of full slice system shown in the array pressure-sensing device 100 ' of Figure 1A '.Yet, explain orally for asking convenient, below still describe with the pressure drag unit 130 of Figure 1A, those skilled in the art are when can understanding easily understanding.
Under the situation that resistance unit 130 be not stressed, between X axis 112 and the Y axis 122 state that presents directions X and Y direction resistance balance.Yet, when resistance unit 130 affords pressure, just can cause the resistance unbalance between X axis 112 and the Y axis 122 because of the pressure size makes directions X or Y direction demonstrate different resistance change.Therefore, under the resistance unbalance state,, just can draw the voltage matrix and the Y direction voltage matrix of directions X when in regular turn X axis 112 or Y axis 122 being carried out zero potential scanning.X shaft voltage matrix and Y shaft voltage matrix are carried out coordinate coding and coordinate computation method, just can obtain the position coordinates and the resistance value of these resistance units 130, again through anti-coordinate and the resistance value size that pushes away resistance unit 130 suffered pressure of this resistance value.
For conveniently understanding above stated specification, Figure 1B illustrates this electric resistance touch-control manipulated or operated apparatus in addition.Please refer to Figure 1A～1B, in regular turn X axis 112 is scanned, promptly respectively to X axis 112a, 112b, 112c input voltage signal V, 2V, 3V in regular turn.When to X axis 112a input voltage signal V, just can carry out the voltage input and measure by Y axis 122.With Y axis 122a is example, and its equivalent circuit diagram can be shown in Fig. 1 C.When to X axis 112a input voltage signal V, can measure voltage signal from Y axis 122a
, R wherein
11Be the resistance value of resistance unit 130a, and R
pIt is the comprehensive effective resistance value of other eight pressure drag unit.
Similar aforementioned, then can measure voltage signal
,
from Y axis 122b, 122c respectively.In addition; When to X axis 112b input voltage signal 2V; Just can measure voltage signal
,
,
from Y axis 122a, 122b, 122c respectively; And when to X axis 112c input voltage signal 3V, just can measure voltage signal
,
,
respectively from Y axis 122a, 122b, 122c.These voltages just can constitute the X matrix and as shown in the formula expression:
Above-mentioned explanation scans Y axis 122 in regular turn, just can measure voltage signal respectively by the X axis and constitute the X matrix, afterwards X matrix and Y matrix is carried out coordinate coding and coordinate computation, just can extrapolate the coordinate position of resistance unit 130, with resistance sizes.Yet preceding method only can be oriented a sensing apparatus position that is under pressure, and still can't accurately the force value size be revealed the pressure distribution of electric resistance touch-control panel through the high gray numerical table.If will further ask for the force value of corresponding precisely low error distributes; Then the resolution of the analog-digital converter of microcontroller need improve; The back-end code computing is with more complicated difficulty simultaneously; Make the electric resistance touch-control sensing apparatus can't be generalized to large tracts of land, multiple wire system turntable driving and the identification of high gray pressure, more can't effectively promote the highly sensitive induction of electric resistance touch-control device.
Summary of the invention
In view of this, technical matters to be solved by this invention is to provide a kind of array pressure-sensing device, is suitable for multiple point touching sensing and pressure and quantizes identification.This array pressure-sensing device and measuring resistance can be passed through MEMS (Micro Electro Mechanical System; MEMS) technology, complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor; CMOS) technology or screen printing technology process can't extra increase manufacturing costs through above-mentioned standard process techniques.
In addition, another purpose of the present invention provides a kind of pressure discrimination method, and utilizes aforesaid array pressure-sensing device to carry out the GTG identification that pressure quantizes.This pressure discrimination method has the first axle of turntable driving in regular turn, second axis and the 3rd axis that three kinds of logic states such as noble potential output, electronegative potential output and high impedance input realize the array pressure-sensing device respectively through the IO port that control module possesses three step responses.Through the hardware structure of this kind array turntable driving flow process and measuring resistance, the GTG discrimination method of the pressure quantification of a kind of linear pressure drag system ([A] [X]=[0]) is proposed.
For realizing above-mentioned or other purposes; The present invention proposes a kind of array pressure device for identifying; Be suitable for multiple point touching sensing and pressure and quantize identification, this array pressure-sensing device comprises a plurality of first axles, a plurality of second axis, a plurality of pressure drags unit, the 3rd axis, a plurality of measuring resistance and control module.Second axis is interconnected with first axle, and between each first axle and each second axis staggered place, disposes a pressure drag unit, and pressure drag unit resistance value of when bearing different pressures itself will have different changes.The 3rd axis is interconnected with first axle, and between each first axle and the 3rd axis staggered place, disposes a measuring resistance, and measuring resistance has resistance value fixing and accurate (resistance error is less than 1%) when bearing different pressures.Control module has a plurality of IO ports (I/O port); And these IO ports are to be coupled to first axle, second axis and the 3rd axis respectively; And control module carries out the scanning and driving flow process of tristate logic (TSL) combination to first axle, second axis and the 3rd axis through IO port, make following disclosed array pressure-sensing device have following advantage at least:
Realize the advantage of multi-point touch (Multi Touch).
Solving the electric resistance touch-control device can't the large-area scanning driving problems.
Significantly promote the high gray identification capability and the high sensitivity touch-control sensing of large tracts of land array pressure contactor control device.
In one embodiment of this invention, above-mentioned tristate logic (TSL) turntable driving flow process comprises noble potential output, electronegative potential output and high impedance input, and electronegative potential output for example is electrical potential minimum of system or ground connection.In addition; When being scanned up to specific pressure drag unit; And this pressure drag unit is specific first axle of correspondence and the second specific axis staggered place; Second axis is carried out turntable driving in regular turn, and driven second axis is that noble potential output drives, and remaining second axis is electronegative potential output or ground connection; And all the other not driven first axles and the 3rd axis carry out electronegative potential output or ground connection, simultaneously control module can carry out the high impedance input in regular turn to first axle sense conditions to measure the voltage signal of corresponding this pressure drag unit dividing potential drop.Similarly; When being scanned up to certain criteria resistance, and this measuring resistance is corresponding specific first axle and the 3rd axis, and the 3rd axis is carried out turntable driving in regular turn; Driven second axis is noble potential output; Remaining second axis is electronegative potential output or ground connection, and all the other not driven first axles carry out electronegative potential output, and control module carries out the high impedance input to measure the voltage signal of corresponding this measuring resistance dividing potential drop in regular turn to first axle simultaneously.After the measuring resistance turntable driving of accomplishing on all pressure drag unit arranged side by side on corresponding arbitrary first axle and corresponding this axis; The measured voltage signal of these pressure drag unit and measuring resistance dividing potential drop forms voltage dividing potential drop matrix; And the resistance value of these pressure drag unit and measuring resistance forms conductance matrix; And voltage dividing potential drop matrix and the conductance matrix matrix that equals zero that multiplies each other, this system of linear equations will constitute linear pressure drag Simultaneous Equations (linear pressure drag module).
In one embodiment of this invention; Above-mentioned control module for example is microcontroller (microcontroller; MCU), fpga chip, asic chip or SoIC embedded chip etc., any control module that possesses the IO port (I/O Port) of tristate logic (TSL) combination.
In one embodiment of this invention, above-mentioned array pressure-sensing device more can comprise a plurality of sensing circuits, and these sensing circuits are to be coupled between first axle and the IO port.In addition, sensing circuit for example is transistor, buffer amplifier circuit, current driving circuit (Constant Current Circuit).
For realizing above-mentioned or other purposes; The present invention proposes a kind of pressure discrimination method in addition; Be suitable for quantizing with aforesaid array pressure-sensing device the pressure discrimination method of array pressure apparatus, this pressure discrimination method comprises the following steps: to measure all the pressure drag unit arranged side by side on corresponding arbitrary first axle and the voltage signal of measuring resistance dividing potential drop; Voltage voltage division signal with these pressure drag unit and measuring resistance forms voltage dividing potential drop matrix; Form conductance matrix with the resistance value of these pressure drag unit and measuring resistance, and the multiply each other matrix that equals zero of voltage dividing potential drop matrix and conductance matrix will form the pressure drag simultaneous equations; Find the solution the pressure drag simultaneous equations and obtain the resistance value of pressure drag unit when being stressed, the pressure/strength/sense of touch conversion with corresponding resistance value at last shows; The rest may be inferred, and all pressure drag unit arranged side by side on remaining first axle are solved by same mode by the resistance value that is stressed in the measured pressure drag simultaneous equations that obtains under the scanning of high impedance input and the combination of electronegative potential output logic in regular turn.
In one embodiment of this invention, above-mentioned step of measuring the voltage signal of all pressure drag unit dividing potential drops arranged side by side on corresponding arbitrary first axle comprises: first axle is carried out the high impedance input in regular turn, and remaining first axle carries out electronegative potential output; In regular turn first second axis being carried out noble potential output drives; Remaining second axis and the 3rd axis are carried out electronegative potential output; This moment, driven first axle was under the high impedance input state, was able to measure the voltage signal of the pressure drag unit dividing potential drop of corresponding this second axis intervening portion.
In one embodiment of this invention; The step of the voltage signal of the above-mentioned measuring resistance of measuring corresponding arbitrary first axle comprises: at first; Second axis is carried out turntable driving in regular turn, and driven second axis is that noble potential output drives, and remaining second axis is electronegative potential output; Simultaneously driven first axle is carried out the high impedance input, remaining first axle is carried out electronegative potential output; The 3rd axis is carried out electronegative potential output, and driven first axle carries out the voltage signal that the high impedance input state is able to measurement standard resistance.
In one embodiment of this invention, above-mentioned electronegative potential output for example is system's potential minimum or ground connection.
In one embodiment of this invention; The resulting linear pressure drag Simultaneous Equations of above-mentioned turntable driving flow process (linear pressure drag module); And the step of finding the solution this simultaneous equations can adopt the method for solving of Gaussian elimination (GaussianElimination), Gauss-Jordon's elimination method (Gauss-Jordan Elimination) or iteration technique simultaneous equationss such as (IterativeMethods), solves the unknown resistance value of all pressure drag units arranged side by side on this first axle.
Be primarily aimed at Gaussian elimination explanation enforcement means in one embodiment of this invention, the quantity of the second above-mentioned axis is N-1, and then voltage dividing potential drop matrix is N * N matrix, and conductance matrix is N * 1 matrix.In addition, each element representation of the i of voltage dividing potential drop matrix row is A
Ij, and i is between 1～N-1, j between 1～N, when j is not equal to i, elements A
IjEqual the negative value of voltage signal of pressure drag unit dividing potential drop of second axis of corresponding j bar, and when j equals i, elements A
IiEqual the voltage signal of pressure drag unit dividing potential drop that noble potential outputting drive voltage signal deducts second axis of corresponding i bar.In addition, each element representation of the N of voltage dividing potential drop matrix row is A
Nj, and j is between 1～N, and when j is not equal to N, elements A
NjEqual the negative value of the voltage signal of this measuring resistance dividing potential drop, and when j equals N, elements A
NNEqual the voltage signal that noble potential outputting drive voltage signal deducts this measuring resistance.Moreover each element representation of conductance matrix is X
i, and i is between 1～N, and when i is not equal to N, element X
iEqual the inverse of pressure drag unit of second axis of corresponding i bar, and when i equals N, element X
NEqual the inverse of measuring resistance.
In sum; In array pressure-sensing device of the present invention and pressure discrimination method thereof; Be to equal zero matrix to form the pressure drag simultaneous equations through voltage dividing potential drop matrix and conductance matrix are multiplied each other; Wherein the pressure drag simultaneous equations has comprised the measuring resistance of fixing and accurate (resistance error is less than 1%), and this measuring resistance is the correction parameter in the linear pressure drag Simultaneous Equations.Then in the process that Gaussian elimination is found the solution; Be with the correction parameter of this measuring resistance in delivered pressure GTG identification flow process; Calculated the resistance value that solves all unknown pressure drag unit since using; Above-mentioned this kind linear number mathematical operations is very simple, and can directly carry out the turntable driving of array pressure-sensing device and the GTG identification work that pressure quantizes through microprocessor (MCU), more significantly reduces the time of microprocessor or rear end computer identification calculation.In addition; Array pressure-sensing device of the present invention can be in the manufacturing step of making the pressure drag unit; Produce measuring resistance simultaneously; Manufacturing cost that so promptly can extra increase array pressure-sensing device, pressure drag unit and measuring resistance can be passed through MEMS (Micro Electro Mechanical System, MEMS) manufacturing, complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor; CMOS) manufacturing or printing technology manufacturing approach realize through above-mentioned standard fabrication technique.
For let above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended accompanying drawing, elaborates as follows.
Description of drawings
Figure 1A and Figure 1A ' are the decomposing schematic representation of two kinds of array pressure-sensing devices of known technology;
Figure 1B illustrates the circuit diagram of the array pressure-sensing device of Figure 1A in addition;
Fig. 1 C is the local equivalent circuit diagram of the array pressure-sensing device of Figure 1A;
Fig. 2 is the synoptic diagram according to the array pressure identification system of one embodiment of the invention;
Fig. 3 A, 3C, 3E are for scan the synoptic diagram of second axis and the 3rd axis in during certain first axle of scanning in regular turn;
Fig. 3 B, 3D, 3F are respectively the synoptic diagram of the equivalent circuit diagram of Fig. 3 A, 3C, 3E;
Fig. 4 is the schematic flow sheet according to the pressure discrimination method of one embodiment of the invention;
Fig. 5 is the synoptic diagram according to the array pressure-sensing device of another embodiment of the present invention;
Fig. 6 A～6D is the synoptic diagram according to four kinds of array pressure-sensing devices of another embodiment of the present invention;
Fig. 7 A, 7B are the synoptic diagram according to two kinds of array pressure-sensing devices of another embodiment of the present invention.
Wherein, Reference numeral
100,100 ': the array pressure-sensing device
110: upper substrate
112,112a, 112b, 112c:X axis
120: infrabasal plate
The 122:Y axis
130,130 ': the pressure drag unit
200,200a, 600a, 600b, 600c, 600d, 700a, 700b: array pressure-sensing device
210,210a～210c: first axle
220,220a～220b: second axis
230,230a～230i: pressure drag unit
240: the three axis
250,250a～250c: measuring resistance
260: control module
262: IO port
264: analog-digital converter
670a, 670b, 670c, 670d: sensing circuit
672b, 672c: amplifier
674b, 674c, 674d: multiplexer
672d: switching device shifter
770a, 770b: buffering drive circuit
Vdriven: driving voltage
R11, R12, R13, R1N, R21, R22, R23, R2N, R31, R32, R33, RMi, RM2, RM3, RMN, Rp: resistance value
I11, I12, I13: electric current
Embodiment
For making the object of the invention, structure, characteristic and function thereof are had further understanding, will and cooperate embodiment to specify as follows with reference to accompanying drawing, but following accompanying drawing and embodiment are merely aid illustration, the present invention be not limited to accompanying drawing and embodiment.
Fig. 2 is the synoptic diagram according to the array pressure-sensing device of one embodiment of the invention, and for asking simple clear expression, and Fig. 2 is that to express the present invention with the mode of circuit diagram be how multi-point touch and the notion that quantizes pressure, and describes with the structure of three-wire type earlier.Please refer to Fig. 2, array pressure-sensing device 200 of the present invention comprises a plurality of first axles 210 (210a, 210b, 210c), a plurality of second axis 220 (220a, 220b), a plurality of pressure drags unit 230, the 3rd axis 240, a plurality of measuring resistance 250 and control module 260.First axle 210 can be horizontal plain conductor (being similar known X axis); And second axis 220 can be plain conductor (being similar known Y axis) longitudinally, and first axle 210 and second axis 220 are that to form grid with crisscross mode staggered.But the present invention does not limit the relative configuration relation between the first axle 210 and second axis 220, and those skilled in the art are when can change a little, and it still belongs within the category of the present invention.
Accept above-mentionedly, pressure drag unit 230 is to be configured in this latticed staggered place to couple the first axle 210 and second axis 220, and in other words, pressure drag unit 230 is to be configured between the staggered place of the first axle 210 and second axis 220.Generally speaking, pressure drag unit 230 can be considered the insulation open-circuit condition when not bearing pressure, that is is to present the state that opens circuit between the corresponding first axle 210 and second axis 220.When pressure drag unit 230 affords pressure, just can change the architectural characteristic of pressure drag own and become conducting state, with resistance the conducting corresponding first axle 210 and second axis 220.In addition, pressure drag unit 230 can have different resistance values because of bearing different force value, and resistance value and force value have corresponding relation, can calculate the suffered force value in all pressure drag unit 230 by resistance value.
It should be noted that; After narration in; Resistance value how to obtain these pressure drag unit 230 all only is described; And those skilled in the art are converted into corresponding force value when understanding the resistance value of still needing pressure drag unit 230 easily, thus the resistance value of pressure drag unit 230 force value suffered with it to can be considered be the parameter of equivalence.In addition; In the process of scanning array formula pressure-sensing device 200, no matter whether array pressure-sensing device 200 accepts ambient pressure, all can measure the state of pressure drag unit 230; If pressure drag unit 230 is an off state, represent that then pressure drag unit 230 is not stressed state.Therefore no matter whether stressed scanning array formula pressure-sensing device 200 is, but all array formula pressure-sensing device 200 scans.
Please, similar aforementioned again with reference to figure 2, the 3rd axis 240 also can be longitudinally plain conductor (being similar known Y axis) and with first axle 210 intersections, and measuring resistance 250 is to be configured between the staggered place of first axle 210 and the 3rd axis 240.Because measuring resistance 250 has fixing resistance value, so the first axle 210 of correspondence and the 3rd axis 240 are the states that present the resistance conducting, and measuring resistance can not have different resistance values because of bearing different pressures, temperature with humidity.
In addition; Control module 260 has a plurality of IO ports 262; And these IO ports 262 are to be coupled to first axle 210, second axis 220 and the 3rd axis 240 respectively, and control module 260 is to carry out tristate logic (TSL) through 262 pairs of first axles of IO port 210, second axis 220 and the 3rd axis 240 to make up turntable driving array pressure-sensing device 200 in regular turn.
Detailed, this tristate logic (TSL) makes up with respect to the angle of control module 260 and can be divided into: 1. noble potential is exported 2. electronegative potentials and is exported the input of 3. high impedances.Carrying out noble potential output or electronegative potential output is the drive signal that control module 260 is externally exported specific noble potential or electronegative potential; In the present embodiment; The voltage signal of noble potential output for example is driving voltage Vdriven; And the voltage signal of electronegative potential output for example is system's potential minimum, also can be ground connection simultaneously.But the present invention does not limit the size of these voltage signals.In addition, carrying out high impedance input and be meant from the specific voltage signal of outer Input Control Element 260, in other words, is to accuse the voltage signal of system unit 260 from the extraneous dividing potential drop of IO port 262 measurements.
The mode of turntable driving flow process of the present invention below will be detailed, and cooperate the theory of mathematical operation that mode how to ask for pressure drag unit 230 resistance values is described.Be convenient explanation; The resistance value of these pressure drag unit 230a, 230b, 230c, 230d, 230e, 230f representes with R11, R12, R21, R22, R31, R32 respectively, and the resistance value of measuring resistance 250a, 250b, 250c is represented with R13, R23, R33 respectively.Generally speaking, when pressure drag unit 230 did not receive ambient pressure, it is infinitely great that its resistance value can be considered.In addition, the resistance value of pressure drag unit 230 is a unknown parameter to be asked for, and the resistance value of measuring resistance 250 is regarded as fixed value and be known parameters.
Scan mode with present embodiment; Be to scan first axle 210 (210a, 210b, 210c) in regular turn; And scan second axis 220 (220a, 220b) and the 3rd axis 240 in during being scanned up to certain first axle 210 in regular turn; The whole array pressure-sensing device 200 of turntable driving is accomplished in the tristate logic (TSL) of control module IO port combination whereby in regular turn.Fig. 3 A, 3C, 3E are for scan the synoptic diagram of second axis and the 3rd axis in during certain first axle of scanning in regular turn; Particularly; During scanning first axle 210a; Fig. 3 A, 3C, 3E scan the second axis 220a, 220b and the 3rd axis 240 respectively in regular turn; And Fig. 3 B, 3D, 3F are respectively the equivalent circuit diagrams of certain specific pressure drag unit of scanning among Fig. 3 A, 3C, the 3E; And, respectively above-mentioned first axle 210 (210a, 210b, 210c), these second axis 220 (220a, 220b) and the state of the 3rd axis 240 being indicated in the opposite side of relative chip 260 for asking expression convenient, those skilled in the art unlikelyly obscure when understanding easily.
Please be earlier with reference to figure 3A and Fig. 3 B; And this is the situation of the scanning first axle 210a and the second axis 220a; Also be the situation of scanning pressure drag unit 230a, wherein pressure drag unit 230a is corresponding first axle 210a and the second axis 220a and be coupled between the first axle 210a and the second axis 220a.In Fig. 3 A and Fig. 3 B; Control module 260 is that first axle 210a is carried out the high impedance input sensing; Drive and the second axis 220a is carried out noble potential output, and remaining first axle 210b, 210c, remaining second axis 220b and the 3rd axis 240 are carried out electronegative potential output.In detail, control module 260 provides the second axis 220a driving voltage Vdriven, and with first axle 210b, 210c, the second axis 220b and the 3rd axis 240 ground connection, measures the voltage signal V11 of corresponding pressure drag unit 230a dividing potential drop whereby.
The equivalent electrical circuit of aforementioned turntable driving pressure drag unit 230a can be shown in Fig. 3 B, and driving voltage Vdriven can divide hydraulic circuit to form in the face of the pressure drag unit 230b and the measuring resistance 250a of parallel connection behind process pressure drag unit 230a.In addition, according to the Ke Xihefu current law, the electric current I 12 of the electric current I 11 of the pressure drag unit 230a that flows through, the pressure drag unit 230b that flows through has specific equality relation with the electric current I 13 of the measuring resistance 250a that flows through and representes as follows:
I
11＝I
12+I
13 (2)
I wherein
11=(V
Driven-V
11)/R
11, I
12=(V
11-0)/R
12, I
13=(V
11-0)/R
13
Formula (2) rewriting just can be obtained following equality:
Driving voltage Vdriven and resistance value R13 known parameters wherein, and voltage signal V11 is measurable known parameters for setting, and resistance value R11, R12 are parameter to be asked for.
Then; Just scan the first axle 210a and the second axis 220b and shown in Fig. 3 C and Fig. 3 D; Similar aforementioned; Control module 260 provides the second axis 220b driving voltage Vdriven, and with first axle 210b, 210c, the second axis 220a and the 3rd axis 240 ground connection, whereby to measure the voltage signal V12 of corresponding pressure drag unit 230b dividing potential drop.
The equivalent electrical circuit of aforementioned scan mode can be shown in Fig. 3 D, and driving voltage Vdriven can divide hydraulic circuit to form in the face of the pressure drag unit 230a and the measuring resistance 250a of parallel connection behind process pressure drag unit 230b.In addition, according to the Ke Xihefu current law, then can obtain following equality:
Come, please refer to Fig. 3 E and Fig. 3 F, this is the situation of scanning first axle 210a and the 3rd axis 250a, also is the situation of scanning standard resistance 250a.In Fig. 3 E and Fig. 3 F; Control module 260 is that first axle 210a is carried out the high impedance input sensing; Drive and the 3rd axis 250a is carried out noble potential output, and remaining first axle 210b, 210c and the second axis 220a, 220b are carried out electronegative potential output.In detail, control module 260 provides the second axis 220b driving voltage Vdriven, and with first axle 210b, 210c and the second axis 220a, 220b ground connection, whereby to measure the voltage signal V13 of corresponding measuring resistance 250a dividing potential drop.
The equivalent electrical circuit of aforementioned scan mode can be shown in Fig. 3 F, and driving voltage Vdriven can divide hydraulic circuit to form in the face of pressure drag unit 230a, the 230b of parallel connection behind process measuring resistance 250a.In addition, according to the Ke Xihefu current law, then can obtain following equality:
Please be simultaneously with reference to formula (3), formula (4), formula (5), the mode of its matrix capable of using is represented the pressure drag simultaneous equations that is made up of these equalities.That is the voltage signal construction of the present invention's pressure drag capable of using unit 230a, 230b and measuring resistance 250a dividing potential drop goes out voltage dividing potential drop matrix [A]; And the construction reciprocal that utilizes the resistance value of pressure drag unit 230a, 230b and measuring resistance 250a goes out conductance matrix [X], and then voltage dividing potential drop matrix [X] multiplies each other with conductance matrix and can equal zero matrix [0] to represent this pressure drag simultaneous equations.Particularly, voltage dividing potential drop matrix [A], conductance matrix [X] and relation thereof can be represented as follows
[A][X]＝[0] (8)
Generally speaking, if the resistance value R13 of measuring resistance 250a is a unknown parameter, then the resistance simultaneous equations of formula (8) can cause the situation of infinitely separating because free dimension is spent Gao Erhui more.Yet the present invention utilizes measuring resistance 250a accurately to determine in advance to decide resistance value R13 size, so as to reducing a free dimension resistance value R13 capable of using counter inquire into pressure drag unit 230a, the resistance value R11 of 230b, R12.
In the present embodiment, the pressure drag simultaneous equations of finding the solution formula (8) utilizes Gaussian elimination to find the solution through known correction parameter (250a).Particularly, be to make voltage dividing potential drop matrix [A] abbreviation is become upper triangular matrix, just can extrapolate pressure drag unit 230a, the resistance value R11 of 230b, R12 from last leu preface.But not limit be so that where formula is found the solution formula (8) in the present invention, and those skilled in the art are when understanding easily.
It should be noted that; In an embodiment of the present invention with the array pressure-sensing device on three rank as illustrative example (voltage dividing potential drop matrix [A] is a third-order matrix); According to the error of resistance value that the inventive method calculates only in 5%; Need the complicated Current Negative Three-Point Capacitance sensing circuit of deciding compared to known technology for the turntable driving of array pressure drag sensing apparatus, monitoring flow is crossed the size of current of resistance-type sensing element at any time, reaches the driving effect of resistance-type sensor.The present invention will significantly promote the turntable driving of large tracts of land array pressure-sensing device, the GTG identification error of adherence pressure quantification simultaneously.
Accept above-mentioned; Source of error of the present invention mainly is analog-digital converter (ADC Converter, 10bit) error of precision and control module 260 IO port driving force three kinds of identifications that hardware problem causes such as (25mA) from the resistance value error of measuring resistance 250 (1% precision standard resistance), control module 260 itself.How to improve the method for identification error, will explain respectively following:
One, adopts the littler measuring resistance of error, with the accuracy that improves the identification of pressure GTG.
Two, adopt the control module with more high-precision analog digital sensor, the error that makes control module carry out high impedance input measurement electric signal reduces.
Three, promote through the driving force of buffer circuit with control module 260 IO ports, the ability of tending to act can drive array pressure drag unit to make IO port have enough.
In addition, the present invention only need accomplish the first axle 210 (210a, 210b, 210c) of the specific row of scanning, just can ask for the resistance value of the pressure drag unit 230 of corresponding arbitrary first axle 210.Must all scan the back to horizontal longitudinal axis compared to known technology and the beginning can carry out computing, the present invention more can reach the effect of multiple point touching sensing and instant computing.
Please again with reference to figure 2; After accomplishing scanning first axle 210a, just then scan first axle 210b, and then scanning first axle 210c; And the mode of scanning first axle 210b, 210c all the mode with aforementioned scanning first axle 210a is identical, repeat no more at this.After all first axles 210 are all accomplished scanning, just accomplish scanning array formula pressure-sensing device 200.Just repeat afterwards just can obtain the pressure distribution state on the array pressure-sensing device 200 immediately with aforementioned manner scanning array formula pressure-sensing device 200.
Although in the process of above stated specification scanning array formula pressure-sensing device 200 structures, the pressure discrimination method of explanation correspondence in the lump.But for making those skilled in the art can more know above stated specification, Fig. 4 illustrates the schematic flow sheet of the pressure discrimination method of one embodiment of the invention in addition.Need to prove; Pressure discrimination method of the present invention is not only applicable to the array pressure-sensing device 200 of previous embodiment; More be suitable for all array pressure-sensing devices, and, describe with certain embodiments for asking explanation convenient according to spirit of the present invention.
Please refer to Fig. 4 and Fig. 3 A～3E, shown in step S11 and measure the pressure drag unit of corresponding arbitrary first axle and the voltage signal of measuring resistance.Present embodiment is to be example with first axle 210a; And that corresponding first axle 210a is pressure drag unit 230a, 230b and measuring resistance 250a, so will measure the voltage signal V13 of voltage signal V11, V12 and the measuring resistance 250a dividing potential drop of pressure drag unit 230a, 230b dividing potential drop.
The mode of measuring voltage signal V11, the V12 of pressure drag unit 230a, 230b can be of preamble.210a carries out the high impedance input sensing to this first axle; And remaining first axle 210b, 210c are carried out electronegative potential output; And in regular turn one of them second axis 220 is carried out noble potential output driving, and remaining second axis 220 and the 3rd axis 240 are carried out electronegative potential output.With Fig. 3 A, be the second axis 220a to be carried out noble potential output drive, and being carried out electronegative potential with the 3rd axis 240, exports the second axis 220b, with the voltage signal V11 of the pressure drag unit 230a dividing potential drop of measuring the corresponding second axis 220a.With Fig. 3 C, be the second axis 220b to be carried out noble potential output drive, and being carried out electronegative potential with the 3rd axis 240, exports the second axis 220a, with the voltage signal V12 of the pressure drag unit 230b dividing potential drop of measuring the corresponding second axis 220b.
The mode of measuring the voltage signal V13 of measuring resistance 250a can be of preamble.With Fig. 3 E; First axle 210a is carried out the high impedance input sensing; And remaining first axle 210b, 210c are carried out electronegative potential output; And the 3rd axis 240 is carried out noble potential export driving, and the second axis 220a, 220b are carried out electronegative potential output, to measure the voltage signal V13 of measuring resistance 250a dividing potential drop.
Please again with reference to figure 4; Then shown in step S12～S13; With the voltage signal V11 of these pressure drag unit 230a, 230b dividing potential drop, V12 therewith the voltage signal V13 of measuring resistance 250a dividing potential drop form voltage dividing potential drop matrix [A]; And with these pressure drag unit 230a, the 230b resistance value conductance matrix [X] that forms reciprocal of measuring resistance 250a therewith, wherein voltage dividing potential drop matrix [A] can be joined aforementioned formula (6) and the formula (7) made with conductance matrix [X].
Accept above-mentionedly, voltage dividing potential drop matrix [A] and conductance matrix [X] multiply each other and can equal zero matrix (shown in aforementioned formula (8)) to form pressure drag simultaneous equations (shown in aforementioned formula (3)～formula (5)).Shown in step S14, find the solution this pressure drag simultaneous equations at last to obtain these pressure drag unit 230a, the resistance value R11 of 230b, R12.
The present invention is that construction goes out voltage dividing potential drop matrix in the process of a certain first axle of turntable driving, and voltage dividing potential drop order of matrix number be the quantity that depends on second axis and the 3rd axis with.In other words, the present invention's quantity of not limiting first axle quantity that must be same as second axis and the 3rd axis with.Below, will promote above stated specification to generalized case, and cooperate the tonometric method of the present invention that illustrates.
Fig. 5 is the synoptic diagram according to the array pressure-sensing device of another embodiment of the present invention.Please refer to Fig. 5, the array pressure-sensing device 200a of present embodiment is similar with the array pressure-sensing device 200 of Fig. 2, and its difference only is that first axle 210 is different with the quantity of second axis 220.Therefore particularly, the quantity of first axle 210 is the M bar, and the quantity of second axis 220 is the N-1 bar, the quantity of second axis 220 and the 3rd axis 240 and be the N bar.
Through the calculation of deriving, voltage dividing potential drop matrix [A] then can constitute N * N matrix thus, and conductance matrix [X] then can constitute N * 1 matrix.In addition, each element in the voltage dividing potential drop matrix [A] can be expressed as elements A
Ij, wherein i, j be respectively expression laterally with ordinal number longitudinally, and each element in the conductance matrix [X] can be expressed as element X
i, wherein i is the horizontal ordinal number of expression.
With first axle 210a is example, and voltage dividing potential drop matrix [A] can be represented as follows with conductance matrix [X]:
V11～V13 wherein ... For measuring corresponding pressure group unit 230g～230i ... Voltage signal; V1N is the voltage signal of measuring corresponding measuring resistance 250d dividing potential drop; R11～R13 ... Be pressure group unit 230g～230i ... Resistance value; R1N ... Be the resistance value of measuring resistance 250d, Vdriven is that the voltage signal that noble potential output drives is a driving voltage.
Please refer to formula (9), the element on diagonal line, other elements are identical in every row.With the part of pressure group unit (from first row to the row second from the bottom), the element of voltage dividing potential drop matrix [A] can be expressed as Aij, and i is between 1～N-1, and j is between 1～N.When j is not equal to i, elements A
IjEqual the negative value of voltage signal of pressure drag unit dividing potential drop of second axis of first axle and the j bar of corresponding i bar, and when j equals i, elements A
IiThe drive voltage signal Vdriven that equals noble potential output deducts the voltage signal of pressure drag unit dividing potential drop of second axis of corresponding i bar.
With the part (last row) of measuring resistance, the element of the N of voltage dividing potential drop matrix [A] row can be expressed as A
Nj, and j is between 1～N.When j is not equal to N, elements A
NjEqual the negative value of the voltage signal V1N of measuring resistance 250d dividing potential drop, and when j equals N, elements A
NNThe drive voltage signal Vdriven that equals noble potential output deducts the voltage signal V1N of measuring resistance 250d.
Please refer to formula (10), the element of conductance matrix [X] can be expressed as X
i, and i is between 1～N.When i is not equal to N, element X
iEqual the inverse of resistance value of pressure drag unit of second axis of corresponding i bar, and when i equals N, element X
NEqual the inverse of the resistance value of measuring resistance 250d.
In the present embodiment; For asking convenient the 3rd axis 240 is disposed at last column; But the 3rd axis 240 also can be interspersed between these second axis 220, and those skilled in the art just repeat no more in this when revising voltage dividing potential drop matrix according to above stated specification easily.
In addition, although the voltage signal of noble potential of the present invention output and electronegative potential output is respectively driving voltage and ground connection (zero potential), yet the present invention does not limit the size of these voltage signals.When the voltage signal of noble potential output and electronegative potential output is respectively Vhigh and Vlow, still can be according to above stated specification rewriting formula (9) as follows:
It should be noted that in array pressure-sensing device of the present invention the mode of pressure drag unit and measuring resistance printing capable of using coating and forming at the same time promptly need not to increase manufacturing step and the effective cost of manufacture of array of controls formula pressure-sensing device whereby.In addition; The present invention is the kind of limiting controling unit not; For example; Control module can be microcontroller, and (microcontroller MCU), fpga chip, asic chip or SoIC embedded chip, and allly has the chip of the input and output of tristate logic (TSL) combination all to can be used in the array pressure-sensing device of the present invention.
In addition, the more configurable sensing circuit of the present invention is so that control module more can accurately be measured the corresponding pressure drag unit or the voltage signal of measuring resistance.Fig. 6 A is the synoptic diagram according to the array pressure-sensing device of another embodiment of the present invention.Please refer to Fig. 6 A; The array pressure-sensing device 600a of present embodiment is similar with the array pressure-sensing device 200 of Fig. 2; Its difference only is that array pressure-sensing device 600a more sets up a plurality of sensing circuit 670a between first axle 210 and IO port 262, and sensing circuit 670a for example is that amplifier is so that control module more can effectively carry out the high impedance input sensing to first axle 210.Subsidiary one carries, and under the situation of setting up sensing circuit 670a, the two ends of first axle 210 all will be connected to control module 260, and those skilled in the art just repeat no more in this when understanding easily.
Fig. 6 B is the synoptic diagram according to the array pressure-sensing device of another embodiment of the present invention.Please refer to Fig. 6 B; The array pressure-sensing device 600b of present embodiment is similar with the array pressure-sensing device 600a of Fig. 6 A; Its difference only is that sensing circuit 670b comprises a plurality of amplifier 672b and a multiplexer 674b in detail; First axle 210 is to be couple to amplifier 672b earlier, and these amplifiers 672b is couple to multiplexer 674b, and multiplexer 674b is couple to control module 260 through IO port 262 again.
Similar aforementioned, Fig. 6 C, 6D are the synoptic diagram according to two kinds of array pressure-sensing devices of another embodiment of the present invention.Please refer to Fig. 6 C, 6D; The array pressure-sensing device 600c of present embodiment, 600d are similar with the array pressure-sensing device 600b of Fig. 6 B; Its difference only is that the sensing circuit 670c of Fig. 6 C comprises an amplifier 672c and a multiplexer 674c, and the sensing circuit 670d of Fig. 6 D comprises a plurality of switch 672d and multiplexer 674d.
With Fig. 6 C, first axle 210 is to be couple to multiplexer 674c earlier, and multiplexer 674c is couple to amplifier 672c, and amplifier 672c is couple to control module 260 through IO port 262 again.With Fig. 6 D; The difference of itself and Fig. 6 B only is amplifier 672b is substituted by switch 672d; And switch 672d belongs to many-to-one switching device shifter; Make this many-to-one switching device shifter of IO port control of control module 260 negligible amounts capable of using, through this switching device shifter with the more first axle 210 of controlling the size.In addition, switch 672d is used for conducting first axle to be driven 210, and is conducting first axle 210a at Fig. 6 D, and with remaining first axle 210b, 210c ground connection.
It should be noted that; In aforementioned all embodiment; All can between second axis 220 and control module 260, set up buffer circuit again; With the driving force of the IO port 262 that strengthens control module 260, and more set up buffer circuit 770a with corresponding IO port 262 at second axis 220 like the array pressure-sensing device 700a of Fig. 7 A.Certainly, the moving circuit 770a of one of them buffer zone is disposed between the 3rd axis 240 and the corresponding IO port 262 more simultaneously.In the present embodiment, buffer circuit 770a can be big current driving element or driving circuits such as transistor, buffering integrated component (Buffer IC), constant-current circuit, and those skilled in the art just no longer detail the structure of buffer circuit when understanding easily in this.In addition, buffer circuit is built in the control module 260 in also can be directly, and shown in the buffering drive circuit 770b of the array pressure-sensing device 700b of Fig. 7 B.
Subsidiary one carry be; In Fig. 7 A and Fig. 7 B, control module 260 also can in modeling intend digital quantizer 264 (Analog-to-Digital Converter, ADC); Voltage signal with simulation converts digital numerical value into conveniently to carry out computing; Those skilled in the art work as and can understand easily, and the structure of changing the array pressure-sensing device a little according to aforesaid explanation, but it all belongs within the category of the present invention.
In sum, array pressure-sensing device of the present invention and pressure discrimination method thereof have advantage at least:
One, according to the error of resistance value that the inventive method calculates in 5%, the scanning drive method of invention whereby can significantly promote the array number of array resistance sensing device.In addition, if promote the degree of accuracy (measuring resistance error less than 1% in) of measuring resistance again, can further reduce the calculation error of the resistance value of pressure drag unit.
Two, pressure drag simultaneous equations of the present invention is the once polynomial form of N dimension, and it is found the solution simple and can significantly reduce microprocessor (MCU) or computer data operation time.When particularly transferring to this pressure drag simultaneous equations with matrix representation, the Gaussian elimination of linear number mathematical operations more capable of using is found the solution rapidly, and reaches the requirement of standardized calculation.
Three, when scanned arbitrary first axially after; Just can begin to calculate the resistance value of corresponding this first axial pressure drag unit; Can begin to carry out computing and need not the array pressure-sensing device all have been scanned the beginning, whereby to promote the effect of the instant computing of instant scanning.
Four, pressure drag unit and measuring resistance can together be made, cost of manufacture that so promptly can extra increase array pressure-sensing device.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. an array pressure-sensing device is suitable for multiple point touching sensing and pressure and quantizes identification, it is characterized in that this array pressure-sensing device comprises:
A plurality of first axles;
A plurality of second axis, interconnected with said first axle;
A plurality of pressure drags unit, and pressure drag unit of configuration between each first axle and each the second axis staggered place, and said pressure drag unit has different resistance values when bearing different pressures;
One the 3rd axis, interconnected with said first axle;
A plurality of measuring resistances, and measuring resistance of configuration between each first axle and the 3rd axis staggered place, and said measuring resistance has identical resistance value when bearing different pressures; And
One control module; Have a plurality of IO ports; And said IO port is to be coupled to said first axle, said second axis and the 3rd axis respectively, and this control module carries out the turntable driving flow process of tristate logic (TSL) combination to said first axle, said second axis and the 3rd axis through said IO port.
2. array pressure-sensing device according to claim 1 is characterized in that, this tristate logic (TSL) combination comprises noble potential output, electronegative potential output and high impedance input.
3. array pressure-sensing device according to claim 2; It is characterized in that; When being scanned up to specific pressure drag unit, and the corresponding specific first axle and the second specific axis in this pressure drag unit, and this control module carries out the input of this high impedance to driven this first axle; This second axis is carried out this noble potential output to be driven; And all the other not driven first axles are carried out electronegative potential export, remaining second axis and the 3rd axis carry out this electronegative potential output, and driven first axle is in order to measure the voltage signal of corresponding this pressure drag unit.
4. array pressure-sensing device according to claim 3; It is characterized in that; When being scanned up to certain criteria resistance; And corresponding specific first axle and the 3rd axis of this measuring resistance, and this control module carries out this high impedance input to driven this first axle, and the 3rd axis is carried out this noble potential output driving; And remaining first axle and said second axis carried out this electronegative potential output, driven first axle is in order to measure the voltage signal of corresponding this measuring resistance.
5. array pressure-sensing device according to claim 4; It is characterized in that; After the said pressure drag unit of accomplishing corresponding arbitrary first axle and the scanning of this measuring resistance; The voltage signal of said pressure drag unit and this measuring resistance forms a voltage dividing potential drop matrix, and the inverse of the resistance value of said pressure drag unit and this measuring resistance forms a conductance matrix, makes this voltage dividing potential drop matrix and this conductance matrix matrix that equals zero that multiplies each other.
6. array pressure-sensing device according to claim 1 is characterized in that this control module possesses a plurality of buffering drive circuits, and said buffering drive circuit is to be coupled between said second axis and the corresponding IO port.
7. a pressure discrimination method is applicable to the described array pressure-sensing device of claim 1 pressure sensor, and it is characterized in that, this pressure discrimination method comprises:
Measure the said pressure drag unit of corresponding arbitrary first axle and the voltage signal of this measuring resistance;
Voltage signal with said pressure drag unit and this measuring resistance forms a voltage dividing potential drop matrix;
Form a conductance matrix so that the value of the resistance of said pressure drag unit and this measuring resistance is reciprocal, and this voltage dividing potential drop matrix and this conductance matrix multiply each other and equal zero matrix to form a pressure drag simultaneous equations; And
Find the solution this pressure drag simultaneous equations to obtain the resistance value of said pressure drag unit.
8. pressure discrimination method according to claim 7 is characterized in that, the step of voltage signal of measuring the said pressure drag unit of corresponding arbitrary first axle comprises:
This first axle is carried out high impedance input, and remaining first axle is carried out electronegative potential output; And
In regular turn second axis corresponding to this pressure drag unit is carried out noble potential output, and remaining second axis and the 3rd axis are carried out this electronegative potential export, to measure voltage signal pressure drag unit that should first axle.
9. pressure discrimination method according to claim 7 is characterized in that, the step of voltage signal of measuring this measuring resistance of corresponding arbitrary first axle comprises:
This first axle is carried out high impedance input, and remaining first axle is carried out electronegative potential output; And
The 3rd axis is carried out noble potential output, and said second axis is carried out this electronegative potential output, to measure the voltage signal of this measuring resistance.
10. pressure discrimination method according to claim 7 is characterized in that, the step of finding the solution this resistance simultaneous equations is to adopt Gaussian elimination, Gauss-Jordon's elimination method or iteration technique.
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| CN105675024B (en) * | 2016-01-04 | 2018-01-02 | 东南大学 | A kind of data read method, the device of resistive sensor array |
| CN105808010B (en) * | 2016-03-31 | 2018-11-30 | 京东方科技集团股份有限公司 | A kind of substrate, display device and its Pressure identification method |
| CN106441649B (en) * | 2016-08-25 | 2018-11-16 | 中南大学 | The method with measurement pressure is positioned with communicate-type piezoresistance sensor array |
| CN108267239A (en) * | 2018-01-23 | 2018-07-10 | 广东美的厨房电器制造有限公司 | System for detecting temperature, cooking appliance and temperature checking method |
| CN110044525A (en) * | 2019-04-26 | 2019-07-23 | 西安建筑科技大学 | A kind of flexible resistive dot matrix pressure detecting system, method and apparatus |
| CN111060235B (en) * | 2019-12-31 | 2021-11-05 | 北京航空航天大学 | Device and method for detecting static force applied by finger of user and finger shaking |
| CN113237579B (en) * | 2021-05-06 | 2022-10-14 | 南京邮电大学 | Flexible pressure sensor based on graphene array and preparation method thereof |
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