CN105094461B - Touch pressure detection device and method - Google Patents
Touch pressure detection device and method Download PDFInfo
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- CN105094461B CN105094461B CN201510404868.2A CN201510404868A CN105094461B CN 105094461 B CN105094461 B CN 105094461B CN 201510404868 A CN201510404868 A CN 201510404868A CN 105094461 B CN105094461 B CN 105094461B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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Abstract
The invention discloses a kind of touch pressure detection device and method, described device includes optical transmitting set and photodetector, wherein：Optical transmitting set is irradiated to the body part of touch action for emitting light；Photodetector obtains the touch pressure that body part generates for receiving the reflected reflected light of body part, according to the intensity of reflected light.The present invention to the body part for having touch action by emitting light, and it receives through the reflected reflection light of blood in body part, the touch pressure that body part generates is obtained according to the intensity of reflected light, realizes and utilizes volumetric blood to detect touch pressure optically.This mode has the advantages that detection sensitivity is high, realizes simple in structure, small volume, is lower-cost relative to traditional capacitance detecting method and varistor detection method.
Description
Technical field
The present invention relates to technical field of pressure detection, more particularly, to a kind of touch pressure detection method and device.
Background technology
In daily life, people touch touch panel to be operated using mobile terminal usually using finger, such as
Unlocked by fingerprint is carried out using finger, and the touch control operations such as presses, click, double-clicking.In many application scenarios, if it is possible to examine
The touch pressure of finger is measured, the operating function of terminal can be enriched according to touch pressure, while can also be passed through
System handles to promote the experience effect of user.For example, user when being consulted a map with mobile terminal, can utilize finger to touch
The variation of pressure zooms in or out；For another example, new key mode can be defined using the difference of touch pressure (as used
Weight is gently pressed instead of clicking, double-clicking), new game function (be such as used for racing car acceleration, high jump and squat down) is developed, pressure is utilized
Power testing result control motor does touch feedback etc..
Two kinds nothing more than of the method for existing detection finger touch pressure, one is capacitance detecting method, another kind is pressure-sensitive
Resistance detection method.
Wherein, capacitance detecting method, that is, when finger pressing being utilized to carry the panel of sensor, finger dynamics are bigger, and finger connects
The area of contacting surface plate is bigger, and the bigger principle of the capacitance between below the panel detecting electrode judges finger according to capacitance size
Pressure size.This detection method has following defect：
1) volume is big：The area of detecting electrode or distributed areas should be at least suitable with finger area, are otherwise difficult to detect；
2) poor sensitivity：Finger contact area is not very big with pressure change, and also very little, detection are clever for the variable quantity of capacitance
Sensitivity is limited.
3) dispersion is big：Individual finger size itself has differences, and leads to different user, identical pressing dynamics, but detect
Result difference is big.
And varistor detection method installs piezoresistive pressure sensor that is, in target detection below the panel, works as press surface
When plate, panel can have small stroke with pressing dynamics, and the varistor resistance value installed thereunder is caused to change,
To according to the big small quantization pressing dynamics of change in resistance.This detection method has the following problems：
(1) realize that structure is difficult：Sensor as aforementioned needs small stroke to detect pressure change, needs very smooth peace
Mounted in below the panel so that structure implementation method is extremely difficult.
(2) it is easy to be influenced by equipment modes of emplacement：If on mobile terminals by pressure checking device installation, working as movement
When the angle change of terminal panel relative CG line, since the gravity of panel influences, measurement error can be brought.
(3) of high cost：The cost and infrastructure cost of sensor can cause final scheme cost higher.
In conclusion the technical solution of touch pressure is detected in existing technology, with complicated, volume is larger, real
Existing disadvantage of high cost, detection sensitivity is low.
Invention content
The main purpose of the present invention is to provide a kind of touch pressure detection device and methods, it is desirable to provide a kind of structure letter
The touch pressure detection scheme that list, small volume, cost are relatively low, detection sensitivity is high.
To achieve these objectives, the present invention proposes a kind of touch pressure detection device, including optical transmitting set and photodetector,
In：
The optical transmitting set is irradiated to the body part of touch action for emitting light；
The photodetector, for receiving the reflected reflected light of the body part, according to the strong of the reflected light
Degree obtains the touch pressure that the body part generates.
The present invention proposes a kind of touch pressure detection method simultaneously, includes the following steps：
Emit light to the body part for having touch action；
Receive the reflected reflected light of blood in the body part；
The touch pressure that the body part generates is obtained according to the intensity of the reflected light；
Wherein, the touch pressure and the volumetric blood in the body part are in inverse correlation, strong with the reflected light
Degree is proportionate.
A kind of touch pressure detection device provided by the present invention, by emitting light to the body part for having touch action
Line, and receive through the reflected reflection light of blood in body part, obtaining body part according to the intensity of reflected light generates
Touch pressure, realize and detect touch pressure optically.This mode is relative to traditional capacitance detecting method and pressure-sensitive
Resistance detection method has the advantages that detection sensitivity is high, realizes simple in structure, small volume, is lower-cost.
Description of the drawings
Fig. 1 is that the touch pressure detection device of the embodiment of the present invention is applied to the schematic diagram of mobile terminal；
Fig. 2 is the structural schematic diagram of one embodiment of touch pressure detection device of the present invention；
Fig. 3 is the module diagram of the optical transmitting set of the touch pressure detection device of the embodiment of the present invention；
Fig. 4 is the module diagram of the photodetector of the touch pressure detection device of the embodiment of the present invention；
Fig. 5 is the connection diagram of each unit module of the touch pressure detection device of the embodiment of the present invention；
Fig. 6 is the schematic diagram of the input signal of pre-processing module and output signal in Fig. 5；
Fig. 7 is the circuit connection diagram of the optical transmitting set of the touch pressure detection device of the embodiment of the present invention；
Fig. 8 is the circuit connection diagram of the photodetector of the touch pressure detection device of the embodiment of the present invention；
Fig. 9 A are the relation schematic diagrams of volumetric blood and touch pressure in the embodiment of the present invention；
Fig. 9 B are the relation schematic diagrams of electrical signal intensity and volumetric blood in the embodiment of the present invention；
Fig. 9 C are the relation schematic diagrams of electrical signal intensity and touch pressure in the embodiment of the present invention；
Figure 10 is the flow chart of one embodiment of touch pressure detection method of the present invention；
Figure 11 is the flow chart of step S13 in Figure 10.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Referring to Fig. 1, showing for the key area 130 of mobile terminal is applied to for touch pressure detection device 120 of the invention
It is intended to.
Fig. 2 is one preferred embodiment of touch pressure detection device of the present invention, and described device 120 includes cover board 128, bottom plate
125, optical transmitting set 122 and photodetector 124, optical transmitting set 122 and photodetector 124 be placed in cover board 128 and bottom plate 125 it
Between, cover board 128 is used to touch for the body part 110 (such as finger or other body parts) of user, and light can be protected to send out
Emitter 122 and photodetector 124, bottom plate 125 is for carrying optical transmitting set 122 and photodetector 124.Wherein：
Optical transmitting set 122：For emitting light 121, the light 121 of transmitting has specific wavelength, can penetrate cover board
128 irradiations touch the body part 110 of cover board 128.
Photodetector 124：For receiving 110 reflected reflected light 123 of body part, according to the strong of reflected light 123
Degree obtains touch pressure of the body part 110 to cover board 128.
Can also be variously-shaped shell it should be noted that cover board 128 is not limited to plane；It can be in terms of material
Selection can penetrate the material of specific wavelength light, such as transparent cover plate, black PE materials, so that optical transmitting set 122 emitted
Light can pass through.
Touch pressure detection device 120 also can only include optical transmitting set 122 and photodetector 124, and body part 110 can be straight
Contact touch optical transmitting set 122 or it is tangible encapsulation optical transmitting set 122 and photodetector 124 pcb board on.
Further, further include a shading piece 126, which is set to optical transmitting set 122 and photodetector 124
Between, to stop that the light 121 of the transmitting of optical transmitting set 122 shines directly into photodetector 124 and influences accuracy of detection.
When light 121 is irradiated to the body part 110 (below by taking finger as an example) of people, body part 110 can absorb one
Some light reflects a part of light 123, including the light by Tissue reflectances such as skin, blood, bones.By skin and
The light of the Tissue reflectance of bone is substantially stationary, will not change with the variation of pressure；By the light of the Tissue reflectance of blood
Can be different and different with the volumetric blood in body part 110, i.e. body part 110 is different to the pressure of cover board 128, wherein
Volumetric blood can be different, the light intensity of reflection is also just different.
When the volumetric blood of body part 110 is higher, the light of absorption it is more and reflect light 123 it is fewer, it is on the contrary
The light more than 123 that the light then absorbed reflects less.Inventor has found through carefully studying, when the touch of user's finger 110 is set
When standby surface (cover board 128 that can such as penetrate specific wavelength light), the volumetric blood that finger 110 touches position can become
Change, as the light that it is absorbed that reduces for touching position volumetric blood is also reduced, light, that is, reflected light 123 of reflection then increases,
I.e.：Touch pressure 118 increases, and volumetric blood is reduced, and the intensity of reflected light 123 increases.As it can be seen that touch pressure 118 holds with blood
Product is in inverse correlation, is proportionate with the intensity of reflected light 123.Intensity by detecting reflected light 123 can detect blood in finger 110
The variation of liquid volume, and then detect touch pressure 118.
Wherein, volumetric blood refers to blood volume summation included in blood vessel.As shown in Fig. 2, blood is by static blood
111 and dynamic blood (112,114) composition.Static blood 111 refers to the blood not changed with heart contraction and diastole, dynamic blood
The pulsatile blood that can change with heart contraction and diastole in liquid (112,114) Digital arteries capillary.Static blood 111 1
As the level that keeps relative stability, and the volume of dynamic blood (112,114) can be sent out when finger is acted on by touch pressure 118
Changing, when finger 110 applies touch pressure 118, arterial capillary is squeezed, this pressure and heart conveying blood
116 collective effect of pressure is in capillary so that the volumetric blood of capillary reaches new balance.Each pressure value corresponds to one
Volumetric blood value measures volumetric blood variation, can obtain pressure change.Although dynamic blood (112,114) volume with
Heart fluctuation also changes in generating period, but this small fluctuation, relative to the volumetric blood caused by touch pressure 118
Variation can be ignored.
The 121 preferred blood of light that optical transmitting set 122 emits is easy to the light absorbed, can such as select feux rouges, infrared light
Or green light etc., such as the infrared light of the feux rouges of 625nm, 840nm, 525nm green light, or above-mentioned light can be selected
Combination.Blood is stronger to the absorbability of the light 121 of transmitting, then with the intensity of its reflected light 123 of the variation of volumetric blood
Variation is bigger, then detection result is better, and accuracy of detection is higher.
As shown in figure 3, optical transmitting set 122 includes luminescence unit 202 and luminous controling unit 204, luminous controling unit 204
Luminous intensity for controlling luminescence unit 202 and lighting timings, luminescence unit 202 are used for the control in luminous controling unit 204
System is lower to emit light.202 preferred light emitting diode of luminescence unit.
Photodetector 124 can utilize intensity of reflected light and the positively related relationship of touch pressure, according to the intensity of reflected light
Quantify touch pressure.
Preferably, photodetector 124 can convert reflected light signal to electric signal, weighed using the intensity of electric signal
The intensity of reflected light is measured, the intensity of electric signal and the intensity of reflected light are proportionate, and electric signal increases with the enhancing of reflected light
By force, weaken with the decrease of reflected light.
As shown in figure 4, photodetector 124 includes photoelectric sensor 206 and analysis and processing unit 207, wherein：Photoelectric sensing
Device 206 converts reflected light signal to electric signal for incuding and receiving reflected light；Analysis and processing unit 207 is used for telecommunications
Number carry out analyzing processing, the intensity of electric signal is obtained, according to the strength quantifies touch pressure of electric signal.
As shown in figure 5, for the connection diagram of each unit module in optical transmitting set 122 and photodetector 124.Wherein, divide
It includes sequentially connected pre-processing module 208, data acquisition module 210,212 and of data processing module to analyse processing unit 207
Feedback regulation module 214, pre-processing module 208 are also connect with photoelectric sensor 206 and feedback regulation module 214 respectively, number
It is also connect with the luminous controling unit of optical transmitting set 122 204 according to processing module 212.Wherein：
Pre-processing module 208：Small electric signal for being converted to photoelectric sensor 206 is handled, including filter
Except the fixed reference signal in electric signal and processing is amplified to electric signal.
As shown in fig. 6, the input signal of prime processing signal 208 includes fixed reference signal and reflection pressure oscillation
Signal.Fixed reference signal refers to the signal that will not change with the variation of volumetric blood, is body such as dash area in figure
The constant signal that the Tissue reflectances such as the bone in position are returned, is presented as direct current signal in electric signal；And it is reflected by blood
Signal be then presented as that AC signal in electric signal, this part signal are to detect having for touch pressure under finger pressure effect
With part.Pre-processing module 208 may be used the realization of the devices such as amplifier, integrator and filter out and enlarging function.It is filtering out
After fixed reference signal, amplification reflects the signal of pressure oscillation and output so that post-module can be only for useful signal portion
Divide and is handled.
Data acquisition module 210：It, will be electric for carrying out analog-to-digital conversion to treated the electric signal of pre-processing module 208
Signal is converted to digital signal by analog signal.ADC (Analog-to-Digital may be used in data acquisition module 210
Converter, analog-digital converter) realize analog-digital conversion function.
Data processing module 212：For the digital signal that analyzing and processing data acquisition module 210 acquires, number letter is obtained
Number intensity touched and pressed according to the strength quantifies of digital signal using the positive correlation of digital signal strength and touch pressure
The testing result of power.MCU (Microcontroller Unit, micro-control unit) may be used in data processing module 212.
Further, since body different parts (such as different fingers), different human body under stress volumetric blood variation or blood
Light-absorbing characteristic may be not quite similar, therefore data processing module 212 controls feedback regulation also according to analysis and processing result
The adjusting pre-processing module 208 of module 214 filters out parameter, so that testing result is more accurate, while also controlling light emitting control
Unit 204 adjusts luminous intensity, the lighting timings etc. of luminescence unit 202, to ensure to exist through the reflected signal of body part
In the effective dynamic range of pre-processing module 208.DAC (Digital to analog may be used in feedback regulation module 214
Converter, digital analog converter) filter out the adjusting of parameter.
As shown in fig. 7, a kind of circuit diagram of specific implementation for optical transmitting set 122.Wherein, light emitting control list
Member 204 includes drive current source 304, and drive current source 304 is under the control of control signal 306, and driving luminescence unit 202 is (such as
Light emitting diode) it shines, control signal 306 can be single pulse signal, can also be consecutive pulse or other are customized
Signal format.
As shown in figure 8, (data are wherein omitted in the circuit diagram for a kind of specific implementation of photodetector 124
Processing module 212).The reflected reflection photogenerated induced current of body part, induced electricity are passed through in the induction of photoelectric sensor 206
Stream is converted to voltage signal after pre-processing module 208 carries out a series of processing, is then sent to data acquisition module 210
(ADC).Wherein, pre-processing module 208 includes trsanscondutance amplifier 314, feedback resistance 312 and capacitance 310 in parallel, and mutual conductance is put
The reference voltage (Vref) of big device 314 is adjustable, and feedback resistance 312 can be selected according to the signal strength of photoelectric sensor 206
Suitable resistance value, capacitance 310 are limited the capacitance of bandwidth, can be operated in limiting circuit in rational bandwidth range.Feedback regulation
Module (DAC) is preferably connected by the end in the same direction of a filter (Filter) and trsanscondutance amplifier 314.Data processing module 212
Mutual conductance is adjusted according to the strength control feedback regulation module (DAC) of the collected electric signal of data acquisition module 210 (ADC) 316
The reference voltage Vref (filtering out parameter) that amplifier 314 is held in the same direction, to ensure that the output of trsanscondutance amplifier 314 will not be saturated.
As shown in figure 9, being detected for touch pressure, the volumetric blood at touch position and above-mentioned touch pressure detection device
Electric signal between correspondence.Wherein：
As shown in Figure 9 A, it is the correspondence of volumetric blood and touch pressure：In conjunction with referring to Fig. 2, finger 110 applies pressure
When 118, arterial capillary is squeezed, and the pressure 118 of application is with 116 collective effect of pressure of heart conveying blood in capillary
Blood vessel, flowing into the blood 112 at finger touch position can be obviously reduced so that the volumetric blood of capillary reaches new balance.
Each pressure value corresponds to a volumetric blood value, and pressure is bigger, and volumetric blood is smaller.
As shown in Figure 9 B, it is the relationship signal for the electrical signal intensity that volumetric blood is detected with touch pressure detection device
Figure.In conjunction with referring to Fig. 2, when volumetric blood becomes small under the effect of finger pressure 118, blood emits optical transmitting set 122
The absorbability of light 121 reduces, so that 123 intensity of reflection light that photodetector 124 receives increases, the electricity of conversion
Signal is smaller with increase, i.e. volumetric blood, and electric signal is bigger.It can be seen that the intensity of reflected light 123 and touch pressure 118
Correlation.
As shown in Figure 9 C, it is the variation relation for the electric signal that touch pressure is detected with touch pressure detection device.By with
Upper analysis is known, as touch pressure increases, touch the body part of cover board capillary be under pressure extruding and make the body
Volumetric blood in body region becomes smaller, so that the blood at the position weakens the absorbability of light, intensity of reflected light increases
By force, finally so that the electric signal enhancing that photodetector detects, thus the electric signal that detects of touch pressure detection device with touch
It touches pressure and positive correlation is presented.
The touch pressure detection device of the present invention, can be applied to various electronic equipments, such as can be applied to mobile phone, tablet
The mobile terminals such as computer；And can different from mobile terminal components combine, apply the different location in mobile terminal, such as
The touch panel of mobile terminal, the position of home keys, the position etc. of fingerprint Identification sensor.
The touch pressure detection device of the present invention by emitting light to the body part for having touch action, and receives warp
The reflected reflection light of blood in body part obtains the touch pressure that body part generates according to the intensity of reflected light,
It realizes and detects touch pressure optically.This mode relative to traditional capacitance detecting method and varistor detection method,
Have the advantages that detection sensitivity is high, realizes simple in structure, small volume, is lower-cost.
Referring to Figure 10, proposes one embodiment of touch pressure detection method of the present invention, the described method comprises the following steps：
S11, the light to the body part transmitting for touching it through cover board with specific wavelength.
The light of transmitting is preferably easily to the feux rouges for the 625nm being absorbed by the blood, the infrared light of 840nm or 525nm's
Green light etc., or be the combination of above-mentioned light.
S12, the reflected reflected light of body part is received.
In this step S12, after the light of transmitting is irradiated to body part (such as finger), a part of light is inhaled by body part
Receive, another part light then reflects by body part, receives the part light reflected, including by skin, blood,
The light of the Tissue reflectances such as bone.
Preferably, the device that the light emitted in order to prevent is directly received reflected light receives and influences accuracy of detection,
Can shading piece be set between the device and the device for receiving reflection light of transmitting light.
S13, touch pressure of the body part to cover board is obtained according to the intensity of reflected light.
In this step S13, using the positive correlation of touch pressure and the intensity of reflected light, according to the intensity of reflected light
Quantify the testing result of touch pressure.
In some embodiments it is possible to directly detect the strong of reflected light using light intensity detection device in the prior art
Then degree utilizes the positive correlation of intensity of reflected light and touch pressure, according to the inspection of the strength quantifies touch pressure of reflected light
Survey result.
In embodiments of the present invention, reflected light signal can be converted to electric signal, is weighed using the intensity of electric signal anti-
Penetrate the intensity of light；Then analyzing processing is carried out to electric signal, according to the strength quantifies touch pressure of electric signal.Specifically such as Figure 11 institutes
Show, includes the following steps：
S131, reflected light signal is converted to electric signal.
Specifically, photoelectric sensor can be utilized to incude reflected light, and convert reflected light signal to electric signal.
Fixed reference signal in S132, filtering electric signal is simultaneously amplified processing to electric signal.
Specifically, may be used the devices such as amplifier, integrator realize electric signal filter out and enlarging function.
Wherein, fixed reference signal refers to the signal that will not change with the variation of volumetric blood, is in body part
The constant signal that the Tissue reflectances such as bone are returned, is presented as direct current signal in electric signal, and by the reflected signal of blood
The AC signal being then presented as in electric signal.
S133, electric signal is converted into digital signal by analog signal.
Specifically, ADC may be used to realize the analog-to-digital conversion of electric signal.
S134, analyzing processing digital signal, according to the strength quantifies touch pressure of digital signal.
Specifically, the digital signal of MCU analyzing and processing data acquisition modules acquisition may be used, the strong of digital signal is obtained
Degree, using the positive correlation of digital signal strength and touch pressure, according to the inspection of the strength quantifies touch pressure of digital signal
Survey result.
S135, adjusted according to analysis and processing result filter out fixed reference signal filter out parameter.
Due to body different parts (such as different fingers), different human body under stress volumetric blood variation or blood absorption light
The characteristic of line may be not quite similar, therefore filter out parameter also according to analysis and processing result to adjust, so that testing result is more accurate
Really, described to filter out parameter such as voltage parameter etc..
At the same time it can also control luminous intensity, the lighting timings of device etc. of transmitting light according to analysis and processing result, with
Ensure through the reflected signal of body part in the effective dynamic range that device works.
The touch pressure detection method of the present invention by emitting light to the body part for having touch action, and receives warp
The reflected reflection light of blood in body part obtains the touch pressure that body part generates according to the intensity of reflected light,
It realizes and detects touch pressure optically.This mode relative to traditional capacitance detecting method and varistor detection method,
Have the advantages that detection sensitivity is high, realizes simple in structure, small volume, is lower-cost.
It should be noted that：The touch pressure detection method that above-described embodiment provides and touch pressure detection device embodiment
Belong to same design, the technical characteristic in device embodiment is corresponding in embodiment of the method to be applicable in, and which is not described herein again.
It should be understood that these are only the preferred embodiment of the present invention, the scope of the claims of the present invention cannot be therefore limited,
It is every to utilize equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is applied directly or indirectly in
Other related technical areas are included within the scope of the present invention.
Claims (10)
1. a kind of touch pressure detection device, which is characterized in that including optical transmitting set and photodetector, wherein：
The optical transmitting set is irradiated to the body part of touch action for emitting light；
The photodetector is obtained for receiving the reflected reflected light of the body part according to the intensity of the reflected light
The touch pressure for taking the body part to generate；
Wherein, the volumetric blood of the touch pressure and dynamic blood in the body part is in inverse correlation, with the reflected light
Intensity be proportionate；
The photodetector includes photoelectric sensor and analysis and processing unit；
The photoelectric sensor turns for receiving the reflected reflected light of blood in the body part, and by reflected light signal
Electric signal is turned to, the intensity of the reflected light is weighed with the intensity using the electric signal；
The analysis and processing unit includes sequentially connected pre-processing module, data acquisition module and data processing module, institute
Pre-processing module is stated also to connect with the photoelectric sensor, wherein：
The pre-processing module, for filtering out the fixed reference signal in the electric signal and being carried out to the electric signal after filtering out
Enhanced processing；
The data acquisition module, for the electric signal to be converted to digital signal by analog signal；
The data processing module, for digital signal described in analyzing processing, described in strength quantifies according to the digital signal
The touch pressure that body part generates；
Wherein, the fixed reference signal refers to the signal that will not change with the variation of volumetric blood, it is described filter out after electricity
Signal is the signal for reflecting touch pressure fluctuation.
2. touch pressure detection device according to claim 1, which is characterized in that further include cover board and bottom plate, the light
Transmitter and the photodetector are placed between the cover board and the bottom plate, and the body part touches the cover board；It is described
The light of optical transmitting set transmitting has specific wavelength, can penetrate the cover board and irradiate the body part.
3. touch pressure detection device according to claim 1, which is characterized in that
The analysis and processing unit is used to carry out analyzing processing to the electric signal, according to the strength quantifies of the electric signal
The touch pressure that body part generates.
4. touch pressure detection device according to claim 3, which is characterized in that the analysis and processing unit further includes anti-
Adjustment module is presented, the feedback regulation module is connect with the data processing module and the pre-processing module respectively, according to
The analysis and processing result of the data processing module, adjust the pre-processing module filters out parameter.
5. touch pressure detection device according to claim 4, which is characterized in that the pre-processing module includes：
Trsanscondutance amplifier, feedback resistance and feedback capacity, the feedback resistance and the feedback capacity are in parallel, and are connected across institute
State the inverting input and output end of trsanscondutance amplifier.
6. touch pressure detection device according to claim 1, which is characterized in that the optical transmitting set includes luminescence unit
And luminous controling unit, the luminous controling unit is used to control the luminous intensity and lighting timings of the luminescence unit, described
Luminescence unit under the control of the luminous controling unit for emitting light.
7. touch pressure detection device according to claim 6, which is characterized in that the luminous controling unit includes driving
Current source, the drive current source drive the luminescence unit to shine under the control of pulse signal.
8. according to claim 1-7 any one of them touch pressure detection devices, which is characterized in that the optical transmitting set transmitting
Light include one or more of feux rouges, infrared light and green light.
9. according to claim 1-7 any one of them touch pressure detection devices, which is characterized in that the touch pressure detection
Device further includes the shading piece being set between the optical transmitting set and the photodetector.
10. a kind of touch pressure detection method, which is characterized in that include the following steps：
Emit light to the body part for having touch action；
Receive the reflected reflected light of blood in the body part；
The touch pressure that the body part generates is obtained according to the intensity of the reflected light；
Wherein, the volumetric blood of the touch pressure and dynamic blood in the body part is in inverse correlation, with the reflected light
Intensity be proportionate；
The intensity according to the reflected light obtains the touch pressure that the body part generates：
It converts reflected light signal to electric signal, the intensity of the reflected light is weighed with the intensity using the electric signal；
It filters out the fixed reference signal in the electric signal and is amplified processing to filtering out rear electric signal；
The electric signal is converted into digital signal by analog signal；
Digital signal described in analyzing processing, the touch pressure that body part described in strength quantifies according to the digital signal generates
Power, and adjusted according to analysis and processing result filter out the fixed reference signal filter out parameter；
Wherein, the fixed reference signal refers to the signal that will not change with the variation of volumetric blood, it is described filter out after electricity
Signal is the signal for reflecting touch pressure fluctuation.
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| CN201510404868.2A CN105094461B (en) | 2015-07-10 | 2015-07-10 | Touch pressure detection device and method |
| PCT/CN2015/094640 WO2017008420A1 (en) | 2015-07-10 | 2015-11-16 | Touch pressure detection device and method |
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|---|---|---|---|
| CN201510404868.2A CN105094461B (en) | 2015-07-10 | 2015-07-10 | Touch pressure detection device and method |
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| CN105573555B (en) * | 2016-01-28 | 2018-06-29 | 京东方科技集团股份有限公司 | A kind of pressure touch structure, touch-control display panel, display device |
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