CN105094461A - Apparatus and method for testing touch pressure - Google Patents
Apparatus and method for testing touch pressure Download PDFInfo
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- CN105094461A CN105094461A CN201510404868.2A CN201510404868A CN105094461A CN 105094461 A CN105094461 A CN 105094461A CN 201510404868 A CN201510404868 A CN 201510404868A CN 105094461 A CN105094461 A CN 105094461A
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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 an apparatus and a method for testing touch pressure, wherein the apparatus comprises a light emitter and a light detector; the light emitter is used for emitting light to illuminate a body position with touch actions; the light detector is used for receiving reflection light reflected by the body position; and the touch pressure of produced by the body position is acquired based on the intensity of the reflection light. Through emitting light to the body position with the touch actions and receiving the reflection light reflected by blood in the body position, and acquiring the touch pressure produced by the body position based on the intensity of the reflection light, the touch pressure detected by utilizing blood volume in an optics way is realized; and compared with the traditional capacitance detection method and voltage-sensitive resistance detection method, the method provided herein has the advantages of high detection sensitivity, simple structure, small volume and low cost.
Description
Technical field
The present invention relates to technical field of pressure detection, especially relate to a kind of touch pressure detection method and device.
Background technology
In daily life, people, at use mobile terminal, usually use finger touch contact panel to operate, such as, use finger to carry out unlocked by fingerprint, and press, click, the touch control operation such as double-click.In many application scenarioss, if the touch pressure of finger can be detected, just can enrich the operating function of terminal according to touch pressure, also can be promoted the experience effect of user simultaneously by some system process.Such as, user, when consulting a map with mobile terminal, can utilize the change of finger touch pressure to zoom in or out; And for example, the difference of touch pressure can be utilized to define new key mode (replacement is clicked as gently pressed by weight, double-click etc.), develop new game function (as racing car acceleration, high jump and squat down), utilize pressure sensing result to control motor and do tactile feedback etc.
The method of existing detection finger touch pressure two kinds nothing more than, one is capacitance detecting method, and another kind is voltage dependent resistor (VDR) detection method.
Wherein, capacitance detecting method, when namely utilizing the panel of finger presses with sensor, finger dynamics is larger, and the area of finger contact panel is larger, and the principle that electric capacity between lower panels detecting electrode is larger, judges finger pressure size according to capacitance size.This detection method has following defect:
1) volume is large: the area of detecting electrode or distributed areas should be at least suitable with finger area, otherwise are difficult to detect;
2) poor sensitivity: finger contact area is not very greatly along with pressure changes, and the variable quantity of electric capacity is also very little, and detection sensitivity is limited.
3) dispersion is large: individual finger size itself there are differences, and cause different user, identical pressing dynamics, but testing result difference is large.
And voltage dependent resistor (VDR) detection method, namely at target detection lower panels, piezoresistive pressure sensor is installed, in time pressing panel, panel can have small stroke along with pressing dynamics, the voltage dependent resistor (VDR) resistance of installing thereunder is caused to change, thus according to change in resistance large small quantization pressing force degree.There is following problem in this detection method:
(1) realize structure difficulty: sensor as aforementioned needs small stroke to carry out detected pressures change, need very smooth to be arranged on lower panels, make structure implementation method very difficult.
(2) be easily subject to the impact of equipment modes of emplacement: if installed on mobile terminals by pressure checking device, when the angle change of mobile terminal panel relative CG line, due to the gravity effect of panel, can measuring error be brought.
(3) cost is high: the cost of sensor and infrastructure cost can cause final plan cost higher.
In sum, in existing technology, detect the technical scheme of touch pressure, have complex structure, volume comparatively large, realize the shortcoming that cost is high, detection sensitivity is low.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of touch pressure pick-up unit and method, aims to provide the touch pressure detection scheme that a kind of structure is simple, small volume, cost are lower, detection sensitivity is high.
To achieve these objectives, the present invention proposes a kind of touch pressure pick-up unit, comprises optical transmitting set and photodetector, wherein:
Described optical transmitting set, for emission of light, is irradiated to the body part of touch action;
Described photodetector, for receiving the reflected light that described body part reflects, obtains the touch pressure of described body part generation according to the intensity of described reflected light.
The present invention proposes a kind of touch pressure detection method simultaneously, comprises the following steps:
To the body part emission of light having touch action;
Receive the reflected light that in described body part, blood reflects;
The touch pressure of described body part generation is obtained according to the intensity of described reflected light;
Wherein, the volumetric blood in described touch pressure and described body part is inverse correlation, is proportionate with the intensity of described reflected light.
A kind of touch pressure pick-up unit provided by the present invention, by to the body part emission of light having touch action, and receive the reflection ray that blood reflects in body part, obtain the touch pressure of body part generation according to the intensity of reflected light, achieve and detect touch pressure to be optically.This mode relative to traditional capacitance detecting method and voltage dependent resistor (VDR) detection method, have detection sensitivity high, realize that structure is simple, small volume, lower-cost advantage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the touch pressure pick-up unit of the embodiment of the present invention is applied to mobile terminal;
Fig. 2 is the structural representation of touch pressure pick-up unit one embodiment of the present invention;
Fig. 3 is the module diagram of the optical transmitting set of the touch pressure pick-up unit of the embodiment of the present invention;
Fig. 4 is the module diagram of the photodetector of the touch pressure pick-up unit of the embodiment of the present invention;
Fig. 5 is the connection diagram of each unit module of the touch pressure pick-up unit of the embodiment of the present invention;
Fig. 6 is the input signal of prime processing module and the schematic diagram of output signal in Fig. 5;
Fig. 7 is the circuit connection diagram of the optical transmitting set of the touch pressure pick-up unit of the embodiment of the present invention;
Fig. 8 is the circuit connection diagram of the photodetector of the touch pressure pick-up unit of the embodiment of the present invention;
Fig. 9 A is the relation schematic diagram of volumetric blood and touch pressure in the embodiment of the present invention;
Fig. 9 B is the relation schematic diagram of electrical signal intensity and volumetric blood in the embodiment of the present invention;
Fig. 9 C is the relation schematic diagram of electrical signal intensity and touch pressure in the embodiment of the present invention;
Figure 10 is the process flow diagram of touch pressure detection method one embodiment of the present invention;
Figure 11 is the process flow diagram of step S13 in Figure 10.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
See Fig. 1, be applied to the schematic diagram of the key area 130 of mobile terminal for touch pressure pick-up unit 120 of the present invention.
Fig. 2 is touch pressure pick-up unit one preferred embodiment of the present invention; described device 120 comprises cover plate 128, base plate 125, optical transmitting set 122 and photodetector 124; optical transmitting set 122 and photodetector 124 are placed between cover plate 128 and base plate 125; cover plate 128 touches for the body part 110 (as finger or other position of health) for user; and can protect optical transmitting set 122 and photodetector 124, base plate 125 is for carrying optical transmitting set 122 and photodetector 124.Wherein:
Optical transmitting set 122: for emission of light 121, the light 121 of transmitting has specific wavelength, can irradiate the body part 110 touching cover plate 128 through cover plate 128.
Photodetector 124: for receiving the reflected light 123 that body part 110 reflects, obtains the touch pressure of body part 110 pairs of cover plates 128 according to the intensity of reflected light 123.
It should be noted that, cover plate 128 is not defined as plane, also can be the shell of various shape; Material aspect can be selected through the material of specific wavelength light, as transparent cover plate, black PE material etc., can to pass through with the light enabling optical transmitting set 122 launch.
Touch pressure pick-up unit 120 also only can comprise optical transmitting set 122 and photodetector 124, and body part 110 can directly touch optical transmitting set 122, or tangible on the pcb board encapsulating optical transmitting set 122 and photodetector 124.
Further, also comprise a shading piece 126, this shading piece 126 is arranged between optical transmitting set 122 and photodetector 124, to stop that the light 121 that optical transmitting set 122 is launched shines directly into photodetector 124 and affects accuracy of detection.
When light 121 is irradiated to the body part 110 (below for finger) of people, body part 110 can absorb a part of light, antireflection part light 123, comprising the light by Tissue reflectance such as skin, blood, bones.Substantially fixing by the light of the Tissue reflectance of skin and bone, can not change along with the change of pressure; Can be different along with the volumetric blood difference in body part 110 by the light of the Tissue reflectance of blood, namely the pressure of body part 110 pairs of cover plates 128 is different, and volumetric blood wherein can be different, and the light intensity of reflection is also with regard to difference.
When the volumetric blood of body part 110 is higher, the light of absorption is more and light 123 that is reflection is fewer, on the contrary the light then the absorbed light more than 123 of reflection less.Inventor is through carefully studying discovery, when user points 110 touch apparatus surfaces the cover plate 128 of specific wavelength light (if through), the volumetric blood that finger 110 touches position can change, along with its light absorbed of reduction touching position volumetric blood also reduces, the light of reflection and reflected light 123 increase, that is: touch pressure 118 increases, and volumetric blood reduces, and the intensity of reflected light 123 increases.Visible, touch pressure 118 and volumetric blood are inverse correlation, are proportionate with the intensity of reflected light 123.The change of volumetric blood in finger 110 can be detected by the intensity of detection of reflected light 123, and then detect touch pressure 118.
Wherein, volumetric blood refers to the blood volume summation comprised in blood vessel.As shown in Figure 2, blood is made up of static blood 111 and dynamic blood (112,114).Static blood 111 refers to the blood do not changed with heart contraction and diastole, the pulsatile blood that can change along with heart contraction and diastole in dynamic blood (112,114) Digital arteries capillary.The level that static blood 111 generally keeps relative stability, and dynamic blood (112,114) volume can be subject to changing when touch pressure 118 acts at finger, when finger 110 applies touch pressure 118, arterial capillary is squeezed, pressure 116 acting in conjunction of this pressure and heart pumping blood, in capillary, makes the balance that the volumetric blood of capillary reaches new.The corresponding volumetric blood value of each force value, measures volumetric blood change, just can obtain pressure change.Although dynamic blood (112,114) volume is along with heart fluctuation is also in generating period change, and this small fluctuation, changes negligible relative to the volumetric blood caused by touch pressure 118.
The preferred blood of light 121 that optical transmitting set 122 is launched is easy to the light absorbed, and as selected ruddiness, infrared light or green glow etc., as ruddiness, the infrared light of 840nm, the green glow etc. of 525nm of 625nm, or can select the combination of above-mentioned light.The receptivity of blood to the light 121 launched is stronger, then the Strength Changes along with its reflected light 123 of change of volumetric blood is larger, then Detection results is better, and accuracy of detection is higher.
As shown in Figure 3, optical transmitting set 122 comprises luminescence unit 202 and luminous controling unit 204, and luminous controling unit 204 is for controlling luminous intensity and the lighting timings of luminescence unit 202, and luminescence unit 202 is for emission of light under the control of luminous controling unit 204.Luminescence unit 202 is light emitting diode preferably.
Photodetector 124 can utilize intensity of reflected light and the positively related relation of touch pressure, according to the strength quantifies touch pressure of reflected light.
As preferably, reflected light signal can be converted into electric signal by photodetector 124, and utilize the intensity of electric signal to weigh the intensity of reflected light, the intensity of electric signal and the intensity of reflected light are proportionate, electric signal strengthens along with the enhancing of reflected light, weakens along with weakening of reflected light.
As shown in Figure 4, photodetector 124 comprises photoelectric sensor 206 and analysis and processing unit 207, wherein: reflected light signal, for responding to and receiving reflected light, is converted into electric signal by photoelectric sensor 206; Analysis and processing unit 207, for carrying out analyzing and processing to electric signal, obtains the intensity of electric signal, according to the strength quantifies touch pressure of electric signal.
As shown in Figure 5, be the connection diagram of each unit module in optical transmitting set 122 and photodetector 124.Wherein, analysis and processing unit 207 comprises the prime processing module 208, data acquisition module 210, data processing module 212 and the feedback regulation module 214 that connect successively, prime processing module 208 is also connected with photoelectric sensor 206 and feedback regulation module 214 respectively, and data processing module 212 is also connected with the luminous controling unit 204 of optical transmitting set 122.Wherein:
Prime processing module 208: the small electric signal for transforming photoelectric sensor 206 processes, comprises the fixed reference signal in filtering electric signal and carries out amplification process to electric signal.
As shown in Figure 6, the input signal of prime processing signals 208 comprises the signal of fixed reference signal and reflection pressure surge.Fixed reference signal refers to the signal that can not change with the change of volumetric blood, as dash area in figure, is the constant signal that the Tissue reflectance such as the bone in body part are returned, is presented as direct current signal in electric signal; The signal reflected by blood is then presented as the AC signal in electric signal under finger pressure effect, and this part signal is the useful part detecting touch pressure.Prime processing module 208 can adopt the device such as amplifier, integrator to realize filtering and enlarging function.In filtering after fixed reference signal, amplify the signal of reflection pressure surge and export, post-module can only be processed for useful signal part.
Data acquisition module 210: carry out analog to digital conversion for the electric signal after processing prime processing module 208, electric signal is converted to digital signal by simulating signal.Data acquisition module 210 can adopt ADC (Analog-to-DigitalConverter, analog to digital converter) to realize analog-digital conversion function.
Data processing module 212: the digital signal gathered for analyzing and processing data acquisition module 210, obtains the intensity of digital signal, utilizes the positive correlation of digital signal strength and touch pressure, according to the testing result of the strength quantifies touch pressure of digital signal.Data processing module 212 can adopt MCU (MicrocontrollerUnit, micro-control unit).
In addition, due to health different parts (as difference finger), different human body, volumetric blood change or the characteristic of blood absorption light may be not quite similar under stress, therefore data processing module 212 also controls according to analysis processing result the filtering parameter that feedback regulation module 214 regulates prime processing module 208, to make testing result more accurate, also control the luminous intensity, lighting timings etc. that luminous controling unit 204 regulates luminescence unit 202, to ensure that the signal reflected through body part is in the effective dynamic range of prime processing module 208 simultaneously.Feedback regulation module 214 can adopt DAC (Digitaltoanalogconverter, digital to analog converter) to carry out the adjustment of filtering parameter.
As shown in Figure 7, be the circuit diagram of a kind of specific implementation of optical transmitting set 122.Wherein, luminous controling unit 204 comprises drive current source 304, drive current source 304 is under the control of control signal 306, drive luminescence unit 202 (as light emitting diode) luminous, control signal 306 can be individual pulse signal, also can be consecutive pulse, or other self-defining signal formats.
As shown in Figure 8, be the circuit diagram (wherein eliminating data processing module 212) of a kind of specific implementation of photodetector 124.Photoelectric sensor 206 is responded to the reflected light reflected through body part and is generated induction current, and induction current is converted to voltage signal after prime processing module 208 carries out a series of process, is then delivered to data acquisition module 210 (ADC).Wherein, prime processing module 208 comprises trsanscondutance amplifier 314 in parallel, feedback resistance 312 and electric capacity 310, the reference voltage (Vref) of trsanscondutance amplifier 314 is adjustable, feedback resistance 312 can select suitable resistance according to the signal intensity of photoelectric sensor 206, electric capacity 310 is limited the electric capacity of bandwidth, can be operated in rational bandwidth range by limiting circuit.Feedback regulation module (DAC) is connected with the end in the same way of trsanscondutance amplifier 314 preferably by a wave filter (Filter).The reference voltage Vref (i.e. filtering parameter) that strength control feedback regulation module (DAC) of the electric signal 316 that data processing module 212 collects according to data acquisition module 210 (ADC) regulates trsanscondutance amplifier 314 to hold in the same way, can not be saturated to ensure that trsanscondutance amplifier 314 exports.
As shown in Figure 9, for touch pressure, touch corresponding relation between electric signal that the volumetric blood at position and above-mentioned touch pressure pick-up unit detect.Wherein:
As shown in Figure 9 A, corresponding relation for volumetric blood and touch pressure: combine see Fig. 2, when finger 110 applies pressure 118, arterial capillary is squeezed, pressure 116 acting in conjunction of applied pressure 118 and heart pumping blood is in capillary, the blood 112 flowing into finger touch position can obviously reduce, and makes the balance that the volumetric blood of capillary reaches new.The corresponding volumetric blood value of each force value, pressure is larger, and volumetric blood is less.
As shown in Figure 9 B, the relation schematic diagram of the electrical signal intensity detected for volumetric blood and touch pressure pick-up unit.In conjunction with see Fig. 2, when volumetric blood diminishes under finger pressure 118 acts on, blood reduces the receptivity of the light 121 that optical transmitting set 122 is launched, thus reflection ray 123 intensity making photodetector 124 receive increases, the electric signal transformed is along with increase, namely volumetric blood is less, and electric signal is larger.As can be seen here, the intensity of reflected light 123 and touch pressure 118 correlation.
As shown in Figure 9 C, the variation relation of the electric signal detected for touch pressure and touch pressure pick-up unit.Known by above analysis, along with touch pressure increases, the capillary touching the body part of cover plate is under pressure and extrudes and the volumetric blood in this body part is diminished, and then the receptivity of the blood at this position to light is weakened, intensity of reflected light strengthens, the electric signal that finally makes photodetector detect strengthens, and therefore the electric signal that detects of touch pressure pick-up unit and touch pressure present positive correlation.
Touch pressure pick-up unit of the present invention, can be applied to various electronic equipment, as being applied to the mobile terminal such as mobile phone, panel computer; And can combine from the different parts on mobile terminal, be applied in the diverse location of mobile terminal, as the contact panel of mobile terminal, the position of home key, the position etc. of fingerprint Identification sensor.
Touch pressure pick-up unit of the present invention, by to the body part emission of light having touch action, and receive the reflection ray that blood reflects in body part, obtain the touch pressure of body part generation according to the intensity of reflected light, achieve and detect touch pressure to be optically.This mode relative to traditional capacitance detecting method and voltage dependent resistor (VDR) detection method, have detection sensitivity high, realize that structure is simple, small volume, lower-cost advantage.
See Figure 10, propose touch pressure detection method one embodiment of the present invention, said method comprising the steps of:
S11, to launch to the body part touching it through cover plate there is the light of specific wavelength.
The light launched preferably is easy to the green glow etc. of the ruddiness of the 625nm be absorbed by the blood, the infrared light of 840nm or 525nm, or is the combination of above-mentioned light.
The reflected light that S12, reception body part reflect.
In this step S12, after the light launched is irradiated to body part (as finger), a part of light is absorbed by body part, another part light then reflect by body part, receive by the part light reflected, comprising the light by Tissue reflectance such as skin, blood, bones.
Preferably, affect accuracy of detection in order to the device preventing the light launched directly to be received reflected light receives, shading piece can be set between the device of emission of light and the device receiving reflection ray.
S13, obtain body part to the touch pressure of cover plate according to the intensity of reflected light.
In this step S13, utilize the positive correlation of the intensity of touch pressure and reflected light, carry out the testing result according to the strength quantifies touch pressure of reflected light.
In certain embodiments, the intensity of light intensity pick-up unit direct-detection reflected light of the prior art can be utilized, then utilize the positive correlation of intensity of reflected light and touch pressure, according to the testing result of the strength quantifies touch pressure of reflected light.
In embodiments of the present invention, reflected light signal can be converted into electric signal, utilize the intensity of electric signal to weigh the intensity of reflected light; Then analyzing and processing is carried out to electric signal, according to the strength quantifies touch pressure of electric signal.Specifically as shown in figure 11, comprise the following steps:
S131, reflected light signal is converted into electric signal.
Concrete, photoelectric sensor can be utilized to respond to reflected light, and reflected light signal is converted into electric signal.
Fixed reference signal in S132, filtering electric signal also carries out amplification process to electric signal.
Concrete, the device such as amplifier, integrator can be adopted to realize filtering and the enlarging function of electric signal.
Wherein, fixed reference signal refers to the signal that can not change with the change of volumetric blood, be the constant signal that the Tissue reflectance such as the bone in body part are returned, in electric signal, be presented as direct current signal, the signal reflected by blood is then presented as the AC signal in electric signal.
S133, electric signal is converted to digital signal by simulating signal.
Concrete, ADC can be adopted to realize the analog to digital conversion of electric signal.
S134, analyzing and processing digital signal, according to the strength quantifies touch pressure of digital signal.
Concrete, the digital signal that MCU analyzing and processing data acquisition module gathers can be adopted, obtain the intensity of digital signal, utilize the positive correlation of digital signal strength and touch pressure, according to the testing result of the strength quantifies touch pressure of digital signal.
S135, regulate the filtering parameter of filtering fixed reference signal according to analysis processing result.
Due to health different parts (as difference finger), different human body, volumetric blood change or the characteristic of blood absorption light may be not quite similar under stress, therefore also filtering parameter is regulated according to analysis processing result, to make testing result more accurate, described filtering parameter is as voltage parameter etc.
Meanwhile, the luminous intensity, lighting timings etc. of the device of emission of light can also be controlled according to analysis processing result, to ensure that the signal reflected through body part is in the effective dynamic range of device work.
Touch pressure detection method of the present invention, by to the body part emission of light having touch action, and receive the reflection ray that blood reflects in body part, obtain the touch pressure of body part generation according to the intensity of reflected light, achieve and detect touch pressure to be optically.This mode relative to traditional capacitance detecting method and voltage dependent resistor (VDR) detection method, have detection sensitivity high, realize that structure is simple, small volume, lower-cost advantage.
It should be noted that: the touch pressure detection method that above-described embodiment provides and touch pressure pick-up unit embodiment belong to same design, the technical characteristic in device embodiment is all corresponding in embodiment of the method to be suitable for, and repeats no more here.
Should be understood that; these are only the preferred embodiments of the present invention; can not therefore limit the scope of the claims of the present invention; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (13)
1. a touch pressure pick-up unit, is characterized in that, comprises optical transmitting set and photodetector, wherein:
Described optical transmitting set, for emission of light, is irradiated to the body part of touch action;
Described photodetector, for receiving the reflected light that described body part reflects, obtains the touch pressure of described body part generation according to the intensity of described reflected light.
2. touch pressure pick-up unit according to claim 1, is characterized in that, also comprises cover plate and base plate, and described optical transmitting set and described photodetector are placed between described cover plate and described base plate, and described body part touches described cover plate; The light that described optical transmitting set is launched has specific wavelength, can irradiate described body part through described cover plate.
3. touch pressure pick-up unit according to claim 1, is characterized in that, described photodetector comprises photoelectric sensor and analysis and processing unit,
Reflected light signal for receiving the reflected light that in described body part, blood reflects, and is converted into electric signal by described photoelectric sensor, with the intensity utilizing the intensity of described electric signal to weigh described reflected light;
Described analysis and processing unit is used for carrying out analyzing and processing to described electric signal, the touch pressure that body part produces according to the strength quantifies of described electric signal;
Wherein, the volumetric blood in described touch pressure and described body part is inverse correlation, is proportionate with the intensity of described reflected light.
4. touch pressure pick-up unit according to claim 3, it is characterized in that, described analysis and processing unit comprises the prime processing module, data acquisition module and the data processing module that connect successively, and described prime processing module is also connected with described photoelectric sensor, wherein:
Described prime processing module, for the fixed reference signal in electric signal described in filtering and to described electric signal carry out amplification process;
Described data acquisition module, for being converted to digital signal by described electric signal by simulating signal;
Described data processing module, for digital signal described in analyzing and processing, the touch pressure that body part produces according to the strength quantifies of described digital signal.
5. touch pressure pick-up unit according to claim 4, it is characterized in that, described analysis and processing unit also comprises feedback regulation module, described feedback regulation module is connected with described data processing module and described prime processing module respectively, according to the analysis processing result of described data processing module, regulate the filtering parameter of described prime processing module.
6. the touch pressure pick-up unit according to claim 4 or 5, is characterized in that, described prime processing module comprises:
Trsanscondutance amplifier, feedback resistance and feedback capacity, described feedback resistance and the parallel connection of described feedback capacity, and be connected across inverting input and the output terminal of described trsanscondutance amplifier.
7. touch pressure pick-up unit according to claim 1, it is characterized in that, described optical transmitting set comprises luminescence unit and luminous controling unit, described luminous controling unit is for controlling luminous intensity and the lighting timings of described luminescence unit, and described luminescence unit is used for emission of light under the control of described luminous controling unit.
8. touch pressure pick-up unit according to claim 7, is characterized in that, described luminous controling unit comprises drive current source, and described drive current source drives described luminescence unit luminous under the control of pulse signal.
9. the touch pressure pick-up unit according to any one of claim 1-8, is characterized in that, the light that described optical transmitting set is launched comprise in ruddiness, infrared light and green glow one or more.
10. the touch pressure pick-up unit according to any one of claim 1-8, is characterized in that, described touch pressure pick-up unit also comprises the shading piece be arranged between described optical transmitting set and described photodetector.
11. 1 kinds of touch pressure detection methods, is characterized in that, comprise the following steps:
To the body part emission of light having touch action;
Receive the reflected light that in described body part, blood reflects;
The touch pressure of described body part generation is obtained according to the intensity of described reflected light;
Wherein, the volumetric blood in described touch pressure and described body part is inverse correlation, is proportionate with the intensity of described reflected light.
12. touch pressure detection methods according to claim 11, is characterized in that, the touch pressure that the described intensity according to described reflected light obtains the generation of described body part comprises:
Reflected light signal is converted into electric signal, with the intensity utilizing the intensity of described electric signal to weigh described reflected light;
Analyzing and processing is carried out to described electric signal, the touch pressure that body part produces according to the strength quantifies of described electric signal.
13. touch pressure detection methods according to claim 12, is characterized in that, describedly carry out analyzing and processing to described electric signal, and the touch pressure that body part produces according to the strength quantifies of described electric signal, comprising:
Fixed reference signal in electric signal described in filtering also carries out amplification process to described electric signal;
Described electric signal is converted to digital signal by simulating signal;
Digital signal described in analyzing and processing, the touch pressure that body part produces according to the strength quantifies of described digital signal, and the filtering parameter regulating fixed reference signal described in filtering according to analysis processing result.
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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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| CN105094461B (en) | 2018-07-27 |
| WO2017008420A1 (en) | 2017-01-19 |
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