CN207924689U - A kind of photoelectric sensor and the photosensor arrays with it - Google Patents
A kind of photoelectric sensor and the photosensor arrays with it Download PDFInfo
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Abstract
L Q T signal detection circuits are used the utility model is related to a kind of optical sensor and with its photosensor arrays, i.e., optical signalling detection process is divided into the process of the process and Q T of L Q；Light intensity signal is converted into charge signal by the process of L Q to integrating capacitor transfer charge；The process of Q T determines the charging time used in integrating capacitor by detecting comparison circuit overturning output switching activity signal；Final T is as system output, and L Q T-types signal deteching circuit system output is more linear compared with the prior art.
Description
Technical field
The utility model is related to a kind of photoelectric sensor and with its photosensor arrays, more particularly to one kind " L-
Q-T " type photosensor arrays.
Background technology
Fingerprint sensor is broadly divided into two classes, i.e. optical fingerprint sensor and capacitive fingerprint sensing device at present.Condenser type
Fingerprint sensor is by measuring the big of the connection capacitance formed between fingerprint valley, crestal line and plane sensing electrode array element
Small difference is come to fingerprint imaging.When the dielectric layer between sensing electrode array and finger is thicker, capacitance can decay, sensing
The imaging of device also can be fuzzyyer.Due to the development of technology, Jie of the commercial fingerprint sensor between sensing electrode and target electrode
Matter layer thickness increases to 100um magnitudes from 10um magnitudes.What is more, it is contemplated that the integrality of the industrial design of mobile phone screen,
Wish that fingerprint sensor can be directed through screen glass, that is, the chemically reinforced glass of 1 millimeter -2 millimeters of thickness.So light
The penetration power for learning fingerprint sensor has very big advantage compared with capacitive fingerprint sensing device.But traditional optical finger print sensing
Device is applied has the prodigious disadvantage i.e. thickness of optical fingerprint sensor usually larger when on the smart machines such as mobile phone.Because
Optical fingerprint sensor usually requires to place a finger on optical mirror slip, and finger in the built-in light irradiation, makes light from equipment bottom
Portion's directive prism, and projected after prism reflects；The light of injection is rolled on the rough strain line of finger surface fingerprint
The angle penetrated and the bright and dark light reflected back are just different, form light intensity spatial distribution image；Then prism is used again
Image projection is focused on charge connector part with devices such as lens, obtains multi-grayscale fingerprint image.Due to needing to use three
The structures such as prism and lens, lead to optical length, and general thickness is big, are unfavorable for the industrial design of mobile phone.
The one kind that proposes of NEC provides light source irradiation finger on the outside of optical sensor, and is received in finger using CCD
It diffuses to form fingerprint image.
Above two scheme is suitable for optical fingerprint sensor and is not suitable for being integrated in the situation of glass cover-plate bottom
OLED screen curtain bottom.
Utility model content
The purpose of this utility model is to provide for being suitable for the photoelectric transfer electrification of optical finger print under OLED screen in summary
Road and photosensor arrays and optical signal reading circuit.
OLED screen curtain itself can be used as light source and have translucency, itself can illuminate fingerprint as light source, because away from
From and the reason of light refraction make the reflective light intensity of crestal line, the reflected light of valley line weak to form light and dark fingerprint.Institute
It states that light penetrates glass through fingerprint diffusing reflection and OLED screen curtain enters sensor, can be captured by optical sensor.
If directly by optical sensor be arranged bottom of screen so, reflect and it is irreflexive due to each pixel
Image quality is finally influenced by the very big light of optical range；
And due to OLED luminous intensities are high and the reflectivity of finger it is uncertain therefore need it is big and high-precision using dynamic range
The light that the circuit detection pixel of degree receives.
The utility model provides a kind of " L-Q-T " type photoelectric sensor, and specific practice is：
Photoelectric sensor includes photosensitive circuit, charge integrating circuit and comparison circuit, and the photosensitive circuit will be for that will obtain
To optical signal be converted to electric signal；The output end of the input terminal connection photosensitive circuit of the integrating circuit, circuit of output terminal connect
Connect the input terminal of comparison circuit；The input terminal of the comparison circuit is connected to the output end of the integrating circuit, output end connection
To the output end of photoelectric sensor.
The photosensitive circuit includes light sensitive component, and the light sensitive component is for obtaining optical signalling and believing the optics of acquisition
Number be converted to electric signal；Load circuit, for providing power supply to the light sensitive component；Selecting switch；The load circuit it is defeated
Outlet connects the input terminal of the light sensitive component；The input terminal of the light sensitive component connects the output end of the load circuit, defeated
Outlet is connected to the input terminal of the selecting switch；The input terminal of the selecting switch connects the output end of the light sensitive component,
Output end is connected to the output end of the photosensitive circuit.
Further, photosensitive circuit includes photosensitive circuit array, and photosensitive circuit array includes light sensitive component, for receiving mesh
The transmitting light of finger reflection is marked, and the optical signal received is converted into electric signal output.Due to the ridge of target finger and paddy with
The distance of contact surface is different, and the intensity for emitting light is also different, cause electric signal with the variation of light respective change.It is described
The output end of light sensitive component is electrically connected to selecting switch, and the output end of selecting switch is connected to the input terminal of bus, bus it is defeated
Outlet is connected to the input terminal of integrating circuit, and the output end of integrating circuit is connected to the input terminal of comparison circuit, comparison circuit
Output of the output end as sensor.
Preferably, the light sensitive component is photodiode.
By the way that the reference voltage connected in integrating circuit is arranged so that there are one initial charge values for integrating capacitor tool.When this
When the value of reference voltage changes to the value of the reference voltage in comparison circuit, comparison circuit overturns output signal, which turns over
Time T=(the Qend-Qrst)/I turnedL, ILBe considered as in certain period of time by electric current average, then time quantum is certain
Numerical intervals approximately linear.The sensing process of sensor be exactly " receive the size of light signal strength --- integrating capacitor charge
Speed difference --- comparison circuit flip-flop transition successively ", that is, " L-Q-T " process.
For analysis circuit equation, " L-Q-T " is decomposed into " L-Q " transfer process and " Q-T " transfer process." L-Q " is converted
Process includes resetting integrating circuit and to two parts of integrating capacitor transfer charge.
In one embodiment, the process for resetting integrating circuit is exactly that integrating capacitor is charged to the first reference voltage.
It is VREF1, integration capacitor value Cr to enable the value of the first reference voltage.The quantity of electric charge so originated in integrating capacitor is Qr.rst=
VREF1*Cr。
In another embodiment, it is VREF1 to enable the value of the first reference voltage, and the value of the second reference voltage is VREF2,
Integration capacitor value is Cr, then quantity of electric charge Qr.rst=(VREF2-VREF1) the * Cr originated in integrating capacitor.
When integrating circuit is using another reset circuit, i.e., integrating capacitor and the first initialisation switch are coupled to amplification
When between device negative input end and output end, the level at integrating capacitor both ends is all VREF1, then the charge originated in integrating capacitor
Measure Qr.rst=0.
When to integrating capacitor transfer charge referring to that sensing pixels receive optical signal, photodiode will produce induced electricity
Stream, induced current are integrated capacitance by bus and are collected into, and the quantity of electric charge in integrating capacitor can gradually increase therewith.
In another embodiment, during integrating capacitor collects induced current, adjustment circuit also can be to integral electricity
Hold injection charge, the polarity of the charge is general but is not limited to the opposite charge generated with induced current, to make integrating capacitor
Charge variation speed will not be too fast so that the light that the dynamic range of photoelectric sensor is big and high-precision circuit detection pixel receives
Line.
The transfer process of Q-T is as follows：
In the transfer process of Q-T, after the optical signal that is received in sensing pixels is converted to electric signal, constantly to integral electricity
Charge inducing is shifted in integrating capacitor in road, meanwhile, integral adjustment circuit can shift compensation charge to integrating capacitor, general to mend
Charge is repaid with charge inducing polarity on the contrary, to make the output of integrating circuit generate unidirectional variation, the output end of integrating circuit connects
It is connected to comparison circuit, when third reference voltage of the output of integrating circuit by comparing circuit, comparison circuit output can be overturn,
The time of overturning is exactly the output of fingerprint sensor.It is VREF3 to enable the value of third reference voltage, then comparison circuit output switching activity
At the time of integrating capacitor quantity of electric charge Qr.end=(VREF3-VREF1) * Cr.
Adjustment circuit is set to the average current that integrating circuit injects as IC, the flip-flop transition of comparison circuit is T=
(Qr.end-Qr.rst)/(IL-IC) so, can be obtained by analysis, the utility model proposes circuit structure there are many work
Operation mode, can be according to cost, power consumption, sensitivity etc. demand, the first reference voltage of rational design, the second reference voltage,
Third reference voltage etc..
Description of the drawings
Fig. 1 is photoelectric sensor circuit schematic diagram provided by the utility model.
Fig. 2 a-2c are the photosensitive circuit schematic diagram in photoelectric sensor in the utility model.
Fig. 3 a are time diagram in the utility model.
Fig. 3 b are another time diagram in the utility model.
Fig. 4 a are one schematic diagram of embodiment of integrating circuit in the utility model.
Fig. 4 b are two schematic diagram of embodiment of integrating circuit in the utility model.
Fig. 4 c are three schematic diagram of embodiment of integrating circuit in the utility model.
Fig. 5 is the circuit diagram of comparison circuit in the utility model.
Fig. 6 photoelectric sensor circuit schematic diagrams provided by the utility model, wherein including adjustment circuit.
Fig. 7 a are one schematic diagram of the utility model adjustment circuit embodiment.
Fig. 7 b are two schematic diagram of integrating circuit embodiment in the utility model.
Fig. 7 c are three schematic diagram of the utility model integrating circuit embodiment.
Fig. 7 d the utility model adjustment circuit example IV schematic diagrames, wherein including adjustment circuit switch work schedule signal
Figure.
Fig. 8 is the comparison diagram that integrating circuit exports potential curve and comparator reference voltage 3.
Specific implementation mode
Fig. 1, photosensor arrays 10 are please referred to, light-sensing element array 10 is used to convert optical signals into electric signal,
The row of photosensitive element battle array 10 convert optical signals into electric signal and form fingerprint image in optical fingerprint sensor.The utility model provides
Optical fingerprint sensor include photosensitive circuit 10, bus 50, charge integrating circuit 20 and comparison circuit 30.Photosensitive circuit 10 wraps
The composition of light sensitive component array 16 is included, the output end of photosensitive circuit 10 is connected to the input terminal of bus 50；Bus 50 is connected to multiple
The input terminal of the output end and integrating circuit 20 of light sensitive component 16；The input terminal of integrating circuit 20 is connected to bus 50, output end
It is connected to the input terminal of comparison circuit 30；The input terminal of comparison circuit 30 is connected to the output end of integrating circuit 20, comparison circuit
30 output end is the output end of sensor.
Fig. 2 a are the circuit diagram of photosensitive circuit in the utility model.Photosensitive circuit includes load circuit 15, the photosensitive electricity
Road 10 further includes initialisation switch 17, the output end out of the first port of the initialisation switch 17 and the light sensitive component
Connection, second port are grounded Verf.Light sensitive component 16 is generally photodiode, selecting switch 17 and initialisation switch 18.It is negative
Carry the input terminal of the output end connection light sensitive component 16 of circuit 15；The output of the input terminal connection load circuit 15 of light sensitive component 16
End, output end connect the input terminal of selecting switch 17；The output end of the input terminal connection light sensitive component 16 of selecting switch 17.Initially
The output end of the input termination light sensitive component 16 of Switching 18, output termination reference voltage.
It is another embodiment schematic diagram of the utility model photosensitive circuit in Fig. 2 b, plurality of light sensitive component 16 is total
With selecting switch 17, initialisation switch 18 and reset reference level Verf.The first port of light sensitive component connects load circuit, light
The first port of the second port connection secondary switch 171 of rod element, the second port of secondary switch 171 connect selecting switch 17
First port, selecting switch 17 second port connection photosensitive circuit output end, the second end of corresponding secondary switch 171
The first port of mouth connection initialisation switch 18, the second port connection reference voltage Verf of initialisation switch.
Initialisation switch 18 is used for the output of light sensitive component 16 to terminate to reference voltage Verf, keeps light sensation circuit parasitic electric
The quantity of electric charge of appearance is all consistent when each selecting switch is opened.
The work schedule schematic diagram of Fig. 3 a and Fig. 3 b are please referred to, there are two types of modes for the work schedule of photosensitive circuit, please refer to
Each course of work selecting switch of the first way of Fig. 3 a displayings only switchs once, the lasting inflow bus of induced current,
It include specifically step：
1. being closed initialisation switch 18, the output of light sensitive component is terminated to reference voltage Verf；
2. disconnecting initialisation switch 18；
3. being closed selecting switch 17.
The course of work of the second way of Fig. 3 b displayings is please referred to, selecting switch 17 has multiple open and close mistakes
Journey, when selecting switch 17 is closed, induced current and the charge inducing meeting accumulated in parasitic capacitance on photosensitive circuit
Bus is flowed into, when selecting switch 17 disconnects, induced current is accumulated in pixel parasitic capacitance；Specifically, including step：
1. being closed initialisation switch 18, the output of light sensitive component is terminated to reference voltage Verf；
2. disconnecting initialisation switch 18；
3. being closed selecting switch 17, induced current is persistently sent to bus；
4. disconnecting selecting switch 17, induced current is accumulated in pixel parasitic capacitance；
5. repeating 3-4.
The first port of first initialisation switch connects the first reference voltage, and second port connects integrating capacitor.
Fig. 4 a are the embodiment one of integrating circuit in the utility model, and charge integrating circuit 20 includes first integral capacitance
Cr, the first initialisation switch and the first reference voltage Verf1.The first port of first initialisation switch 21 connects first reference
Voltage verf1, second port meet the output end out of the integrating circuit；The first port of first initialisation switch connects
First reference voltage verf1, second port connect integrating capacitor Cr.The first port of integrating capacitor cr connects the defeated of integrating circuit 33
Outlet out, second port ground connection；The first port of first initialisation switch 21 meets the first reference voltage Verf1, and second port connects
The output end out of integrating circuit 20；First reference voltage verf1 connects the first port of the first initialisation switch 21.
Fig. 4 b are the embodiment two of integrating circuit in the utility model, and integrating circuit 20 includes second point of capacitance cr of product, the
Two initialisation switch 21, the second reference voltage and the first amplifier Amp.The first port of second integral capacitance cr is connected to amplification
The negative input end of device 22, second port are connected to the output end out of amplifier Amp.The first port of second initialisation switch 21
It is connected to the negative input end 22 of the first amplifier Amp, second port is connected to the output end out of amplifier Amp.First amplifier
The positive input terminal 23 of Amp is connect with the second reference voltage verf1, and negative input end 22 is connect with the input terminal in of integrating circuit 20,
Output end out is connect with the output end out of integrating circuit 20.The positive input terminal of second reference voltage verf1 and amplifier Amp
23 connections.
Fig. 4 c are the embodiment three of integrating circuit, and integrating circuit 20 includes third integral capacitance cr, third initialisation switch
25, the 4th initialisation switch 24 and follows out first reference voltage verf1, the second reference voltage Verf2, the second amplifier Amp
Close 26.
The negative input end 22 of the first port connection amplifier Amp of third integral capacitance cr, at the beginning of second port connection the 4th
The first port of beginning Switching 24.
The positive input terminal 23 of second amplifier Amp is connect with the first reference voltage verf1, negative input end 22 and integrating circuit
20 input terminal in connections, output end are connect with the output end out of integrating circuit 20.
First reference voltage verf1 connects with the second port 25 of third initialisation switch and the positive input terminal of amplifier 23
It connects.
Second reference voltage verf2 is connect with the second port of the 4th initialisation switch 24.
The first port of third initialisation switch 25 is connect with the first port of third integral capacitance cr, second port connection
First reference voltage verf1.
The second port of the first port connection third integral capacitance cr of 4th initialisation switch 24, second port connection the
Two reference voltage verf2.
The first port of switch 26 is followed to be connect with the second port of integrating capacitor cr, second port and integrating circuit 20
Output end out connections.
Fig. 5 is the circuit diagram of comparison circuit in the utility model.As shown in fig. 6, comparison circuit 34 includes comparator Comp
With third reference voltage verf3.
The negative input end 31 of comparator Comp is connect with 30 input terminal in of comparison circuit, and positive input terminal and 32 thirds refer to
Voltage verf3 connections, the output end out of output termination comparison circuit 30.
Third reference voltage verf3 is connect with the positive input terminal of comparator 32.
Fig. 6 is the photoelectric sensor schematic diagram with adjustment circuit 40, and adjustment circuit 40 has a variety of different embodiment party
Formula.Photoelectric sensor includes integral adjustment circuit, and the output end of the integral adjustment circuit and the input terminal of integrating circuit connect,
Electric current or charge compensation are carried out for the integrating capacitor to the integrating circuit.
As shown in Figure 7a, the first embodiment of integral adjustment circuit 40 is that integral adjustment circuit as an electrical current accumulates charge
Parallel circuit carries out linear compensation, and integral adjustment circuit includes current source and conducting switch 41, the first end of the conducting switch 41
Mouth connection current source, second port connect the output end of current source.Current source is to integrating capacitor cr injecting compensating electric currents, to rise
It is acted on to charge compensation.The wherein size of current of current source, direction can be adjusted.When switch 41 is closed, current source start to
Integrating capacitor cr injecting compensating electric currents.
Therefore integral adjustment circuit carries out linear compensation to integrating circuit.
Fig. 7 b are to integrate the embodiment two of adjustment circuit, including compensating switch 41, compensating electric capacity Cc, compensating electric capacity are initial
The first port of the switch 41 of 42. compensating electric capacity of Switching is connect with input port in, the second port and benefit of compensating switch 41
Repay the first port connection of capacitance Cc, the second port of compensating electric capacity and the 4th reference voltage verf4.The first of compensating electric capacity Cc
The first port of the initialisation switch 42 of port and compensating electric capacity connects, and the second port of initialisation switch 42 is with the 5th with reference to electricity
Press verf5 connections.The second embodiment of integral adjustment circuit does electric charge transfer using compensating electric capacity Cc to integrating capacitor cr, to
Play the role of charge compensation.Its process steps is：
1. disconnecting 41 closure switch 42 of switch, charge to compensating electric capacity；
2. disconnecting switch 42；
3. closure switch 41, compensating electric capacity Cc injects charge to integrating capacitor；
4. disconnecting switch 41；
5. returning to step 1；
Fig. 7 c are integral adjustment circuit embodiments three, and compensation is only that with adjustment circuit difference is integrated shown in Fig. 7 b
The second port of capacitance Cc is connect with driver Driver, and the driving capability of level driver is adjustable, can be by adjusting level
Driver adjusts the initial charge amount of compensating electric capacity Cc, that is, realizes the adjustment for compensating integrating capacitor the quantity of electric charge；Fig. 7 c displayings
Integral adjustment circuit it is identical as the process steps of circuit compensation in Fig. 7 b, details are not described herein.
Fig. 7 d are integral adjustment circuit example IV schematic diagrames comprising the 5th reference voltage verf5, the 6th reference voltage
Verf6, the 7th reference voltage verf7, compensating switch 41, initialisation switch 42, the first driving switch 43, the second driving switch
44.The input port in connections of 41 second port of compensating switch and compensation circuit, the first port connection compensation electricity of compensating switch
Hold the second port of Cc, while the first port of 41 second port of compensating switch connection initialisation switch 42.Initialisation switch 42
First port connect with the second port of compensating switch 41, the second port of initialisation switch connects the 5th reference voltage
verf5.The second port of compensating electric capacity Cc is connect with the second port of the first driving switch 43 and the second driving switch respectively, the
One driving switch 43 is connected with the second port of the second driving switch 44.The 7th ginseng of first port connection of first driving switch 43
Voltage verf7 is examined, the first port of the second driving switch 44 connects the 6th reference voltage verf6.The second of compensation circuit is implemented
Example does electric charge transfer using compensating electric capacity Cc to integrating capacitor cr, to play the role of charge compensation.Its process steps is：
1. being closed 42/44 switch, charge to compensating electric capacity；
2. disconnecting 41/43 switch；
3. being closed 41/43 switch, charge is injected to integrating capacitor；
4. disconnecting 42/44 switch；
5. returning to step 1.
Wherein, after to compensating electric capacity Cc chargings, the quantity of electric charge in compensating electric capacity Cc is (VREF5-VREF6) * Cc, vector product
After dividing capacitance Cc injection charges, the quantity of electric charge in compensating electric capacity Cc is (VREF1-VREF7) * Cc, so, the electricity of single compensation
Lotus amount Δ Q=(VREF1-VREF7) * Cc- (VREF5-VREF6) * Cc, the process need to be repeated several times.Cc capacitances can be adjusted
The size of value adjusts the quantity of electric charge compensated every time；VREF1, VREF5, VREF6, the reference voltage levels such as VREF7 can also be adjusted
To adjust the quantity of electric charge compensated every time.
It should be noted that Fig. 7 b to Fig. 7 d are adjusted the charge of integrating capacitor using compensating electric capacity Cc, because
This described integral adjustment circuit carries out discreteness compensation with form of electrical charges to charge integrating circuit.
Wherein Fig. 8 is integrating circuit output voltage characteristic curve, and abscissa indicates that voltage unit, ordinate indicate that the time is single
Position.Its bend is integrating circuit output end voltage characteristic curve, and four oblique lines correspond to different photodiode integrals respectively
Device output voltage characteristic curve is expressed as L1, L2, L3, L4.Horizontal line is comparator reference voltage Verf3 characteristic curves.
As can be seen from the figure add up constantly in integrating capacitor with charge, output voltage (L1, L2, L3, L4) constantly declines final
Intersect with horizontal reference voltage Verf3, comparator output signal is overturn at this time.For different output voltage (L1, L2,
L3, L4) occur above-mentioned intersection time it is different, that is, it is different to reflect the light intensity that different photodiodes are subject to, in the ridge of finger
Line position light intensity is that cross events are short greatly, long in the small corresponding cross events of valley line position light intensity of finger.Meanwhile in integral electricity
Integral process is adjusted using adjustment circuit in the integral process of road, the charge opposite with the electric current that photoelectric sensor generates is logical
Cross adjustment circuit injection integrating circuit so that the integrating rate of integrating circuit is slack-off, corresponding integrating circuit output voltage characteristic
Slope of a curve becomes smaller, and extends the time of integration of integrating circuit, and adjustment circuit can occasionally increase the charge adjustment of integrating circuit
The dynamic range of photoelectric sensor.Correspondingly, determining that integrating capacitor is made by detecting comparison circuit overturning output switching activity signal
Charging time；Final T is as system output, and L-Q-T types signal deteching circuit system output is more linear compared with the prior art.
Claims (12)
1. a kind of photoelectric sensor, including photosensitive circuit, charge integrating circuit and comparison circuit, which is characterized in that
The photosensitive circuit is used to the optical signal got being converted to electric signal；
The output end of the input terminal connection photosensitive circuit of the integrating circuit, circuit of output terminal connect the input terminal of comparison circuit；
The input terminal of the comparison circuit is connected to the output end of the integrating circuit, and output end is connected to the defeated of photoelectric sensor
Outlet.
2. a kind of photoelectric sensor as described in claim 1, which is characterized in that the photosensitive circuit includes light sensitive component, institute
Light sensitive component is stated for obtaining optical signalling and the optical signalling of acquisition being converted to electric signal；Load circuit is used for described
Light sensitive component provides power supply；Selecting switch；
The output end of the load circuit connects the input terminal of the light sensitive component；
The input terminal of the light sensitive component connects the output end of the load circuit, and output end is connected to the defeated of the selecting switch
Enter end；
The input terminal of the selecting switch connects the output end of the light sensitive component, and output end is connected to the defeated of the photosensitive circuit
Outlet.
3. a kind of photoelectric sensor as claimed in claim 2, which is characterized in that the light sensitive component is photoelectricity
Diode.
4. a kind of photoelectric sensor as claimed in claim 2, which is characterized in that the photosensitive circuit further includes
Initialisation switch, the first port of the initialisation switch are connect with the output end of the light sensitive component, and second port connects
Ground.
5. a kind of photoelectric sensor as described in claim 1, which is characterized in that the charge integrating circuit includes first integral
Capacitance, the first initialisation switch and the first reference voltage：
The first port of the integrating capacitor connects the output end of the integrating circuit, second port ground connection；
The first port of first initialisation switch connects first reference voltage, and second port connects the defeated of the integrating circuit
Outlet；
The first port of first initialisation switch connects the first reference voltage, and second port connects integrating capacitor.
6. a kind of photoelectric sensor as described in claim 1, which is characterized in that the integrating circuit includes
Second integral capacitance, the second initialisation switch, the second reference voltage and the first amplifier：
The first port of the second integral capacitance is connected to the negative input end of the first amplifier, and second port is connected to first and puts
The output end of big device；
The first port of second initialisation switch is connected to the negative input end of the first amplifier, and second port is connected to first
The output end of amplifier；
The positive input terminal of first amplifier is connect with the second reference voltage, the input terminal connection of negative input end and integrating circuit, defeated
The output end of outlet and integrating circuit connects；
Second reference voltage is connect with the positive input terminal of the first amplifier.
7. a kind of photoelectric sensor as described in claim 1, which is characterized in that the integrating circuit includes third
Integrating capacitor, third initialisation switch, the 4th initialisation switch, the first reference voltage, the second reference voltage, the second amplification
Device and follow switch：
The first port of the third integral capacitance connects the negative input end of the second amplifier, the 4th initialization of second port connection
The first port of switch；
The positive input terminal of second amplifier is connect with the first reference voltage, and the input terminal of negative input end and integrating circuit connects
It connects, the output end connection of output end and integrating circuit；
The positive input terminal of first reference voltage and the second port and second amplifier of the third initialisation switch
Connection；
Second reference voltage is connect with the second port of the 4th initialisation switch；
The first port of the third initialisation switch is connect with the first port of the third integral capacitance, second port connection
First reference voltage；
The first port of 4th initialisation switch connects the second port of the third integral capacitance, and second port connects institute
State the second reference voltage；
The first port for following switch is connect with the second port of the third integral capacitance, second port and the integral
The output end of circuit connects.
8. a kind of photoelectric sensor according to claim 1, which is characterized in that the comparison circuit includes
Comparator and third reference voltage：
The negative input end of the comparator and the input terminal of comparison circuit connect, and positive input terminal is connect with third reference voltage, defeated
Outlet connects the output end of comparison circuit；
The third reference voltage, connect with the positive input terminal of the comparator.
9. a kind of photoelectric sensor as described in claim 1, which is characterized in that further include integral adjustment circuit, the integral
The input terminal of the output end of adjustment circuit and integrating circuit connects, for the integrating capacitor to the integrating circuit carry out electric current or
Charge compensation.
10. a kind of photoelectric sensor as claimed in claim 9, which is characterized in that the integral adjustment circuit is as an electrical current
Linear compensation is carried out to charge integrating circuit, integral adjustment circuit includes that current source and conducting switch, and the of the conducting switch
Single port connects current source, and second port connects the output end of current source.
11. a kind of photoelectric sensor as claimed in claim 9, which is characterized in that the integral adjustment circuit is with form of electrical charges
Discreteness compensation is carried out to charge integrating circuit, current source includes compensating electric capacity and switching circuit：The compensating electric capacity has one
A initial charge value, and each charge compensation is realized by the switching circuit so that the compensating electric capacity by mending every time
It repays the charge value after process and generates difference with the initial charge value.
12. a kind of photosensor arrays, including photosensitive circuit, bus, charge integrating circuit and comparison circuit, feature exist
In,
The photosensitive circuit includes light sensitive component array, and the output end of photosensitive circuit is connected to the input terminal of the bus；
The bus connects the output end of multiple light sensitive components and the input terminal of integrating circuit；
The input terminal of the integrating circuit is connected to bus, and output end is connected to the input terminal of comparison circuit；
The input terminal of the comparison circuit is connected to the output end of the integrating circuit, and output end is the output end of sensor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107704827A (en) * | 2017-09-30 | 2018-02-16 | 苏州迈瑞微电子有限公司 | A kind of photoelectric sensor and there are its photosensor arrays |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107704827A (en) * | 2017-09-30 | 2018-02-16 | 苏州迈瑞微电子有限公司 | A kind of photoelectric sensor and there are its photosensor arrays |
| CN107704827B (en) * | 2017-09-30 | 2024-03-12 | 苏州迈瑞微电子有限公司 | Photoelectric sensor and photoelectric sensor array with same |
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