CN209044629U - Photosensitive circuit, photosensitive device and electronic equipment - Google Patents
Photosensitive circuit, photosensitive device and electronic equipment Download PDFInfo
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- CN209044629U CN209044629U CN201790000326.1U CN201790000326U CN209044629U CN 209044629 U CN209044629 U CN 209044629U CN 201790000326 U CN201790000326 U CN 201790000326U CN 209044629 U CN209044629 U CN 209044629U
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
A kind of photosensitive circuit (22), photosensitive device (20) and electronic equipment, the photosensitive circuit (22) includes: sensing unit, corresponding photoreceptor signal is converted to for receiving optical signal, and by the optical signal received, to execute light sensing；Signal output unit (223), the electric signal generated when for sensing unit to be executed light sensing is converted to two different electric signals, and exports.Photosensitive device packet (20) includes above-mentioned multiple photosensitive circuits (22), and electronic equipment includes the photosensitive device.
Description
Technical field
The utility model relates to a kind of for sensing the photosensitive circuit, photosensitive device and electronic equipment of biological information.
Background technique
Currently, fingerprint recognition, has been increasingly becoming the standard configuration component of the electronic products such as mobile terminal.Since optical fingerprint is known
Other specific capacitance formula fingerprint recognition has stronger penetration capacity, therefore it is following that optical fingerprint identification, which is applied to mobile terminal,
Development trend.So, still have much room for improvement applied to the existing optical fingerprint identification structure of mobile terminal.
Utility model content
The utility model embodiment aims to solve at least one of the technical problems existing in the prior art.For this purpose, this reality
Need to provide a kind of photosensitive circuit, photosensitive device and electronic equipment with novel embodiment.
A kind of photosensitive circuit of the utility model embodiment, comprising:
Sensing unit is converted to corresponding photoreceptor signal for receiving optical signal, and by the optical signal received, to execute
Light sensing；
Signal output unit, it is different that the electric signal generated when for the sensing unit to be executed light sensing is converted to two
Electric signal, and export.
The utility model embodiment is by signal output unit, so that sensing unit executes the telecommunications generated when light sensing
It number is exported in a manner of two paths of differential signals, to realize the amplification of electric signal, improves the sensing precision of photosensitive device.
In some embodiments, the signal output unit is further used for: executing light sensation according to the sensing unit
One scheduled constant electric signal is converted to two different electric signals by the electric signal generated when survey.
In some embodiments, the scheduled constant electric signal is a constant current signal.In this way, making signal defeated
The two paths of differential signals of unit output is current signal out, and the output of opposite voltage signal improves the anti-interference energy of signal
Power further improves the sensing precision of photosensitive device.
In some embodiments, the sensing unit includes switch unit and photosensitive unit；Wherein,
The switch unit is swept for receiving a reference signal and one first scanning drive signal receiving first
When retouching driving signal, by the reference signal transmission to the photosensitive unit；
The photosensitive unit is arrived for receiving the reference signal that the switch unit transmits in the first predetermined time
Up to when start execute light sensing.
In the photosensitive circuit of the utility model embodiment, control whether that the photosensitive unit is driven to hold by switch unit
Row light sensing, so not only realizes the independent control of photosensitive unit, and also achieve photosensitive unit generation electric signal and
When, effectively export, to improve the sensing precision of photosensitive device.
In some embodiments, the photosensitive unit include the first branch circuit and the second branch circuit, described first
The optical signal received is converted to corresponding electric signal for receiving optical signal by branch circuit；Second branch circuit is used for
The voltage of second branch circuit first end is maintained to the amplitude of the reference signal.
In some embodiments, first branch circuit includes an at least sensor devices, and the sensor devices include
First electrode, the reference signal transmitted for receiving the switch unit.
In some embodiments, the sensor devices are photodiode, and the cathode of the photodiode is institute
The first electrode for stating sensor devices, the reference signal transmitted for receiving the switch unit, the photodiode
Anode receives a fixed telecommunication number.
In some embodiments, first branch circuit further comprises first capacitor, the of the first capacitor
One pole plate is grounded for receiving the reference signal that the switch unit transmits, the second pole plate of the first capacitor,
And the first capacitor forms discharge loop with the sensor devices when executing light sensing.
The utility model embodiment increases the capacitance of entire photosensitive unit by setting first capacitor, thus
The velocity of discharge of photodiode is reduced, so that the read access time of the voltage signal on photodiode cathode is more sufficient,
To improve the sensing precision of target object.
In some embodiments, the first capacitor is a variable capacitance or the first capacitor is by multiple electricity
Hold the capacitor array of composition.Since first capacitor is set as variable capacitance, adjusted by the capacity of the first capacitor, it can be with
The sensitive time for adjusting photosensitive pixel, to adapt to the variation of environment light, to obtain accurate photoreceptor signal.
In some embodiments, second branch circuit includes one second capacitor, the first pole of second capacitor
Plate connects the switch unit, and the second pole plate of second capacitor receives a fixed telecommunication number.
In some embodiments, the switch unit includes the first transistor and second transistor, and described first
Transistor include the first coordination electrode, the first transmission electrode and the second transmission electrode, second transistor include the second coordination electrode,
Third transmission electrode, the 4th transmission electrode；First coordination electrode and the second coordination electrode, which are used to receive described first, sweeps
Driving signal is retouched, first transmission electrode and third transmission electrode are used to receive the reference signal, second transmission
Electrode is connect with the first end of first branch circuit, the first end of the 4th transmission electrode and second branch circuit
Connection.
In some embodiments, the signal output unit is further used for receiving an output control signal and a perseverance
Constant current signal, and when receiving the output control signal, the constant current signal is converted into two different electric currents
Signal, and export.
In some embodiments, the signal output unit includes third transistor and conversion circuit；The third is brilliant
Body pipe includes third coordination electrode, the 5th transmission electrode and the 6th transmission electrode, and the third coordination electrode is described for receiving
Output control signal, the 5th transmission electrode connect for receiving the constant electric signal, the 6th transmission electrode and the conversion circuit
It connects；The conversion circuit is used for the according to the electric signal of the first end of first branch circuit and second branch circuit
The constant current signal is converted to two different current signals, and exported by the electric signal of one end.
In some embodiments, the conversion circuit includes differential pair tube, and the two different current signal amplitude
The sum of be equal to the constant current signal amplitude.
In some embodiments, the conversion circuit includes the 4th transistor and the 5th transistor, and the described 4th is brilliant
Body pipe includes the 4th coordination electrode, the 7th transmission electrode and the 8th transmission electrode, and the 5th transistor includes the 5th coordination electrode, the
Nine transmission electrodes, the tenth transmission electrode；4th coordination electrode of the 4th transistor and the first of first branch circuit
End connection, the 7th transmission electrode are connect with the 6th transmission electrode of the third transistor, and the 8th transmission electrode is for exporting one
Current signal；5th coordination electrode of the 5th transistor is connect with the first end of second branch circuit, and the described 9th
Transmission electrode is connect with the 6th transmission electrode of the third transistor, and the tenth transmission electrode is for exporting another current signal.
In some embodiments, the switch unit further comprises the 6th transistor, and the 6th transistor includes the
Six coordination electrodes, the 11st transmission electrode, the 12nd transmission electrode, the 6th coordination electrode are driven for receiving one second scanning
Dynamic signal, the 11st transmission electrode are connect with the first pole plate of the first capacitor, the 12nd transmission electrode and institute
The first electrode connection of sensor devices is stated, the first pole plate of the first capacitor is connect with the signal output unit.
In the utility model embodiment, switch unit is used not only for driving photosensitive unit and executes light sensing, but also controls
Photosensitive unit processed terminates light sensing, and photosensitive unit is executed the electric signal that light sensing generates and is latched, therefore in difference
Capable photosensitive pixel can be performed simultaneously light sensing or even all photosensitive pixels are performed simultaneously light sensing, to give photoreceptor signal
Output control provide time enough and flexibility.
In some embodiments, the switch unit includes the first transistor and second transistor, and described first
Transistor include the first coordination electrode, the first transmission electrode and the second transmission electrode, second transistor include the second coordination electrode,
Third transmission electrode, the 4th transmission electrode；First coordination electrode and the second coordination electrode, which are used to receive described first, sweeps
Driving signal is retouched, first transmission electrode and third transmission electrode are used to receive the reference signal, second transmission
Electrode is connect with the first pole plate of first capacitor in first branch circuit, the 4th transmission electrode and second branch
The first end of circuit connects.
The utility model embodiment, which solves photosensitive pixel, to be terminated after executing light sensing, the process that photoreceptor signal is read
In, there is a problem of that electric leakage is unbalance in photosensitive pixel, to improve the sensing precision of photosensitive device.
In some embodiments, the first capacitor is used for when the photosensitive unit terminates light sensing, photosensitive to this
Unit executes the photoreceptor signal generated when light sensing and is latched.
When first capacitor is used not only for executing light sensing in the utility model embodiment, discharge back with sensor devices formation
Road, but also when terminating light sensing, the electric signal that light sensing generates will be executed and latched.In this way, the utility model is implemented
The photosensitive pixel structure of mode is simple, and occupies little space.
The utility model embodiment provides a kind of photosensitive device, the photosensitive electricity including multiple above-mentioned any one embodiments
Road
The utility model photosensitive device includes above-mentioned multiple photosensitive circuits by setting, so that each photosensitive circuit can be only
Vertical control, to realize the sensing of the biological information to the target object in contact with or close to photosensitive device.In addition, due to photosensitive
Device has above-mentioned photosensitive circuit, therefore the photosensitive device has the technical effect of above-mentioned photosensitive circuit, to improve photosensitive
The sensing precision of device.
In some embodiments, the photosensitive device further comprises being electrically connected respectively with the multiple photosensitive circuit
Photosensitive driving unit and signal processing unit；The photosensitive driving unit is for driving the photosensitive circuit to execute light sensation
The electric signal generated when surveying, and executing light sensing according to the photosensitive circuit, is converted to two not for a scheduled constant electric signal
Same electric signal, and export；The signal processing unit is used for the two different electric signals for exporting the multiple photosensitive circuit
It reads, and is believed according to the predetermined biological characteristic of the signal acquisition of reading in contact with or close to the target object above the photosensitive device
Breath.
In some embodiments, the photosensitive device is a sensitive chip.
In some embodiments, the photosensitive device is for sensing finger print information.
The utility model embodiment provides a kind of electronic equipment, the photosensitive device including above-mentioned any one embodiment.
The additional aspect and advantage of the utility model embodiment will be set forth in part in the description, partially will be under
Become obvious in the description in face, or is recognized by the practice of the utility model embodiment.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model embodiment are from combination following accompanying drawings to embodiment
Description in will be apparent and be readily appreciated that, in which:
Fig. 1 is the array distribution schematic diagram of photosensitive pixel in the photosensitive device of one embodiment of the utility model；
Fig. 2 is the electrical block diagram of one embodiment of photosensitive pixel shown in FIG. 1；
Fig. 3 is signal timing diagram of the photosensitive pixel shown in Fig. 2 when executing light sensing, at each node；
Fig. 4 is in the photosensitive device of one embodiment of the utility model, and photosensitive pixel and scan line, data line and signal are joined
Examine the connection relationship structure between line, and the photosensitive pixel be Fig. 2 shows photosensitive pixel structure；
Fig. 5 is the structural block diagram of one embodiment of photosensitive driving unit shown in Fig. 4；
Fig. 6 is the electrical block diagram of another embodiment of photosensitive pixel shown in FIG. 1；
Fig. 7 is signal timing diagram of the photosensitive pixel shown in fig. 6 when executing light sensing, at each node；
Fig. 8 is the electrical block diagram of the another embodiment of photosensitive pixel shown in FIG. 1；
Fig. 9 is photosensitive pixel and scan line, data line and signal in the photosensitive device of another embodiment of the utility model
Connection structure between reference line, and the photosensitive pixel is the photosensitive pixel structure shown in Fig. 6；
Figure 10 is the structural block diagram of one embodiment of photosensitive driving unit shown in Fig. 9；
Figure 11 is the structural schematic diagram of photosensitive panel in the photosensitive device of one embodiment of the utility model；
Figure 12 is the structural schematic diagram of electronic equipment applied by the photosensitive device of one embodiment of the utility model；
Figure 13 is diagrammatic cross-section of the electronic equipment shown in Figure 12 along I-I line, and Figure 13 shows the portion of electronic equipment
Separation structure；
Figure 14 is the display area of the display panel of one embodiment of the utility model and the sensing region of photosensitive panel
Corresponding position schematic diagram；
Figure 15 is the structural schematic diagram of electronic equipment applied by the photosensitive device of one embodiment of the utility model；
Figure 16 is diagrammatic cross-section of the electronic equipment shown in figure 15 along II-II line, and Figure 16 shows electronic equipment
Part-structure.
Specific embodiment
The embodiments of the present invention is described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein
Same or similar label indicates same or similar element or element with the same or similar functions from beginning to end.Lead to below
It crosses the embodiment being described with reference to the drawings to be exemplary, is only used for explaining the utility model, and should not be understood as practical to this
Novel limitation.
In the description of the present invention, it should be understood that term " first ", " second " are used for description purposes only, and
It cannot be understood as indicating or implying relative importance or implicitly indicate the quantity of indicated technical characteristic.It defines as a result,
The feature of " first ", " second " can explicitly or implicitly include one or more feature.In the utility model
Description in, the meaning of " plurality " is two or more, unless otherwise specifically defined." contact " or " touch " packet
Include directly contact or mediate contact.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected or can be in communication with each other；It can be directly connected, it can also be in
Between medium be indirectly connected, can be the connection inside two elements or the interaction relationship of two elements.For this field
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
Following disclosure provides many different embodiments or example is used to realize the different structure of the utility model.
In order to simplify the disclosure of the utility model, hereinafter to the component of specific examples and being set for describing.Certainly, they are only
Example, and purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals
And/or reference letter, this repetition are for purposes of simplicity and clarity, itself not indicate discussed various embodiments
And/or the relationship between setting.In addition, the example of various specific techniques and material that the utility model provides, but this
Field those of ordinary skill can be appreciated that the application of other techniques and/or the use of other materials.
Further, described feature, structure can be incorporated in one or more embodiment party in any suitable manner
In formula.In the following description, many details are provided to provide and fully understand to the embodiments of the present invention.
However, one of ordinary skill in the art would recognize that, without one or more in the specific detail, or using other knots
Structure, constituent element etc. can also practice the technical solution of the utility model.In other cases, it is not shown in detail or describes known knot
Structure or operation are to avoid fuzzy the utility model.
The utility model embodiment proposes a kind of photosensitive device being set in electronic equipment, is especially set to electronics and sets
Below standby display screen.The display screen, which is such as, but not limited to OLED display panel etc., has the display device for issuing optical signal.Electricity
When sub- equipment works, display screen issues optical signal, is shown with executing corresponding image.At this point, if thering is target object to contact or touch
The electronic equipment is touched, the optical signal that display screen issues reflects after reaching target object, and reflected optical signal passes through aobvious
It is received after display screen by photosensitive device, the optical signal received is converted to electric signal corresponding with optical signal by photosensitive device, with root
According to the electric signal that the photosensitive device generates, the predetermined biological information of target object is formed.
The biological information of above-mentioned target object is such as, but not limited to the skins lines such as fingerprint, palmmprint, ear line, sole letter
The other biologicals characteristic information such as breath and heart rate, blood oxygen concentration, vein.Target object is such as, but not limited to human body, or
The object of other suitable types.
In some embodiments, which also can be set the light source for biological information sensing.When this
When electronic equipment executes biological information sensing, which issues corresponding optical signal, such as infrared light, to realize to mesh
Mark the sensing of the information such as heart rate, blood oxygen concentration, the vein of object.
Electronic equipment for example but is not limited to consumer electrical product, household formula electronic product, vehicular electronic product, gold
Melt the electronic product of the suitable types such as end product.Wherein, consumer electrical product for example mobile phone, tablet computer, notebook electricity
Brain, tabletop display, computer all-in-one machine etc..Household formula electronic product for example intelligent door lock, TV, refrigerator, wearable device etc..
Vehicular electronic product for example automatic navigator, vehicle-carrying DVD etc..Financial terminal product for example ATM machine, self-service transacting business end
End etc..
Fig. 1 is please referred to, Fig. 1 shows the array distribution structure of photosensitive pixel in a photosensitive device, the photosensitive device 20 packet
Multiple photosensitive pixels 22 are included, multiple photosensitive pixel 22 carries out array distribution by linescan method, to form photosensitive array 201.Tool
Body, which includes multirow photosensitive pixel and multiple row photosensitive pixel, and every row photosensitive pixel is spaced apart in X direction,
Each column photosensitive pixel is spaced apart along Y-direction.When photosensitive device 20 carries out image sensing, can be driven line by line from X-direction
Each row photosensitive pixel 22 executes light sensing, then reads from Y-direction the electric signal that each photosensitive pixel 22 executes light sensing and generates.
Certainly, each photosensitive pixel 22 for forming photosensitive array 201 is not limited to vertical relation shown in fig. 1, and in addition or other are advised
Then mode is distributed or non-regular is distributed.
In some embodiments, each photosensitive pixel 22 includes sensing unit and signal output unit.Wherein, described
Sensing unit, when receiving light sensing control signal, executes light sensing for receiving light sensing control signal.Executing light sensation
When survey, the optical signal received is converted to corresponding electric signal for receiving optical signal by the sensing unit；The signal
The electric signal that output unit is used to generate when the sensing unit is executed light sensing is converted to two different electric signals, and defeated
Out.Further, which is used for when receiving output control signal, when executing light sensing according to sensing unit
One scheduled constant electric signal is converted to two different electric signals, and exported by the electric signal of generation.Optionally, the constant electricity
Signal is, for example, a constant current signal.
Specifically, referring to figure 2., Fig. 2 shows a kind of circuit structures of a photosensitive pixel 22 in Fig. 1.The light-sensitive image
Element 22 is referred to as photosensitive circuit.A photosensitive pixel 22 in the utility model embodiment has first input end In1, the
Two input terminal In2, third input terminal In3, the 4th input terminal In4 and one first output end Out1, second output terminal Out2.
It includes the first scanning drive signal that light sensing, which controls signal,.Specifically, which includes that sensing unit and signal export
Unit 223.Sensing unit specifically includes switch unit 221, photosensitive unit 222.Wherein, switch unit 221 is inputted by third
In3 is held to receive a reference signal Vref, in addition, switch unit 221 also receives one first turntable driving by first input end In1
Signal, and reference signal Vref is transmitted to photosensitive unit 222 when receiving the first scanning drive signal, to drive photosensitive list
Member 222 works, and photosensitive unit 222 is converted to the optical signal received when receiving optical signal for receiving optical signal
Corresponding electric signal.Signal output unit 223 receives an output control signal by the second input terminal In2, and passes through the 4th
Input terminal In4 receives a constant electric signal, to execute light sensing according to photosensitive unit 222 when receiving output control signal
When the electric signal that generates constant electric signal is converted into two different electric signals, and from the first output end Out1 and second output terminal
Out2 output.
Optionally, above-mentioned first scanning drive signal and output control signal are a pulse signal, and the first scanning is driven
The duration of high level signal was the first predetermined time in dynamic signal, and the duration of high level is the in output control signal
Two predetermined times.Accordingly, it when switch unit 221 receives the first scanning drive signal, is closed according to high level signal, according to
Low level signal disconnects.Therefore, photosensitive unit 222 receives the reference signal Vref that switch unit 221 transmits, and first
When predetermined time reaches, start to execute light sensing.
In some embodiments, photosensitive unit 222 includes the first branch circuit 2221 and the second branch circuit 2222.Its
In, the first branch circuit 2221 receives optical signal for executing light sensing, and the optical signal received is converted to accordingly
Electric signal；Second branch circuit 2222 is used to maintain the electric signal of the first end of the second branch circuit 2222 described with reference to letter
The amplitude of number Vref.
In some embodiments, the first branch circuit 2221 includes an at least sensor devices.The sensor devices include one
First electrode and second electrode, first electrode is for receiving the reference signal Vref that switch unit 221 transmits, second electrode
For receiving a predetermined electrical signals, such as earth signal NGND.Photoreceptor is applied to by reference to signal Vref and fixed telecommunication number
Two electrodes of part form the reverse drive voltages of driving sensor devices, so that sensor devices be driven to work.The sensor devices are for example
But it is not limited to photodiode D1, changes ground, which can also be light resistance, phototriode, thin film transistor (TFT)
Etc..It should be noted that the quantity of sensor devices may be 2,3 etc..By taking photodiode D1 as an example, the photoelectricity
Diode D1 includes anode and cathode, wherein anode receives a fixed telecommunication number, such as ground signalling NGND；Cathode is as photosensitive
The first electrode of device, the reference signal Vref transmitted for receiving switch unit 221.As long as it should be noted that ginseng
When examining corresponding with the predetermined voltage signals both ends for being applied to photodiode D1 signal Vref, the both ends photodiode D1 can be made
Backward voltage is formed, so that photodiode be driven to execute light sensing.
When switch unit 221 is closed, reference signal Vref is transmitted to two pole of photoelectricity by the switch unit 221 of closure
The cathode of pipe D1, due to having an equivalent capacity inside photodiode D1, reference signal Verf is to photodiode D1
Internal equivalent capacity charges, so that the voltage Vp on the cathode of photodiode D1 is gradually increasing and is reaching ginseng
It is remained unchanged after examining the voltage value of signal Vref.At this point, the voltage difference at the both ends photodiode D1 is up to driving two pole of photoelectricity
The backward voltage of pipe D1 work, i.e. photodiode D1 are in running order.Since the first scanning drive signal is predetermined first
When time reaches, low level is switched to by high level, then switch unit 221 disconnects, and discharge loop is formed inside photodiode D1.
If there is optical signal to be irradiated to photodiode D1 at this time, the reverse current of photodiode D1 is increased rapidly, thus photoelectricity
Voltage Vp on the negative pole node of diode D1 will change, that is, be gradually reduced.Moreover, because the intensity of optical signal is bigger,
The reverse current that photodiode D1 is generated is also bigger, then the decrease speed of the voltage Vp on the negative pole node of photodiode D1
It is faster.
Further, the first branch circuit 2221 further includes first capacitor c1.First capacitor c1 is for executing light sensing
When, discharge loop is formed with sensor devices, to obtain corresponding photoreceptor signal.Specifically, as shown in Fig. 2, first capacitor c1
It is arranged in parallel with sensor devices, i.e. the first pole plate of first capacitor c1 is connect with the cathode of photodiode D1, first capacitor c1
The second pole plate ground connection.When reference signal Vref is transmitted to the cathode of photodiode D1, also first capacitor c1 is filled
Electricity, and when switch unit 221 disconnects, first capacitor c1 and photodiode D1 formation discharge loop, and first capacitor c1
The voltage (i.e. voltage Vp) of first pole plate is also gradually reduced with discharge time.By the way that first capacitor c1 is arranged, photosensitive list is increased
The capacitance of member 222, to reduce the voltage decrease speed on photodiode D1 cathode, it is ensured that get effective
Photoreceptor signal improves photosensitive device 20 to the sensing precision of target object.It should be noted that defining photodiode D1 here
Cathode and first capacitor c1 the first pole plate be the first branch circuit 2221 first end, the anode and the of photodiode D1
The second pole plate of one capacitor c1 is the second end of the first branch circuit 2221.
Further, above-mentioned first capacitor c1 is variable capacitance, such as the capacitor array formed by multiple capacitors, and this is more
A capacitor is arranged in parallel, by controlling whether multiple capacitor accesses the volume change to realize first capacitor c1.Due to first
Capacitor c1 is set as variable capacitance, therefore is adjusted by the capacity of first capacitor c1, adapts to the variation of optical signal received,
To obtain accurate and effective photoreceptor signal.Specifically, if the intensity of the optical signal received is bigger, first capacitor c1's
Capacity is bigger, if the intensity of the optical signal received is smaller, the capacity of first capacitor c1 is smaller.
In some embodiments, the second branch circuit 2222 includes at least one second capacitor c2.In second capacitor c2
First pole plate is for receiving the reference signal Vref that switch unit 221 transmits, and the second pole plate is for receiving a fixed telecommunication
Number, such as earth signal NGND.Reference signal Vref charges to the second capacitor c2, so that the first pole of the second capacitor c2
Voltage Vn on plate is gradually increasing and remains unchanged after the amplitude for reaching reference signal Vref.It should be noted that fixed here
The first pole plate of the second capacitor c2 of justice is the first end of the second branch circuit 2222, and the second pole plate of the second capacitor c2 is second point
The second end of branch circuit 2222.
Further, in some embodiments, switch unit 221 includes the first transistor T1 and second transistor T2.
The first transistor T1 and second transistor T2 be such as, but not limited to triode, metal-oxide-semiconductor, in thin film transistor (TFT) any one or
It is several.By taking metal-oxide-semiconductor as an example, the first transistor T1 includes the first coordination electrode C1, the first transmission electrode S1 and the second transmission electricity
Pole S2, wherein the first coordination electrode C1 is the grid of metal-oxide-semiconductor, the first transmission electrode S1 is the drain electrode of metal-oxide-semiconductor, the second transmission electrode
S2 is the source electrode of metal-oxide-semiconductor.Second transistor T2 includes the second coordination electrode C2, third transmission electrode S3, the 4th transmission electrode S4,
Wherein the second coordination electrode C2 is the grid of metal-oxide-semiconductor, and third transmission electrode S3 is the drain electrode of metal-oxide-semiconductor, and the 4th transmission electrode S4 is
The source electrode of metal-oxide-semiconductor.
First coordination electrode C1 and the second coordination electrode C2 are connect with first input end In1, for receiving the first scanning
Driving signal；First transmission electrode S1 and third transmission electrode S3 are connect with third input terminal In3, for receiving reference signal
Vref；Second transmission electrode S2 is connect with the first end of the first branch circuit 2221 of photosensitive unit 222, in first crystal
When pipe T1 is connected, reference signal Vref is transmitted to the first branch circuit 2221 of photosensitive unit 222；4th transmission electrode S4 with
The first end of second branch circuit 2222 of photosensitive unit 222 connects, and is used in second transistor T2 conducting, by reference signal
Vref is transmitted to the second branch circuit 2222 of photosensitive unit 222.
In some embodiments, the signal output unit 223 in present embodiment includes third transistor T3 and conversion
Circuit 2231.Third transistor T3 be such as, but not limited to triode, metal-oxide-semiconductor, in thin film transistor (TFT) any one or it is several.
By taking metal-oxide-semiconductor as an example, third transistor T3 includes third coordination electrode C3, the 5th transmission electrode S5 and the 6th transmission electrode S6,
Middle third coordination electrode C3 is the grid of metal-oxide-semiconductor, and the 5th transmission electrode S5 is the drain electrode of metal-oxide-semiconductor, and the 6th transmission electrode S6 is MOS
The source electrode of pipe.Third coordination electrode C3 is connect with the second input terminal In2, for receiving output control signal；5th transmission electrode
S5 is connect with the 4th input terminal In4, for receiving constant current signal an Is, the 6th transmission electrode S6 and the conversion circuit
2231 connections.The third transistor T3 controls signal conduction according to the output, and constant current signal Is is transmitted to institute
State conversion circuit 2231.
Further, conversion circuit 2231 includes differential pair tube, and there are three input terminals and two outputs for differential pair tube tool
End, wherein an input terminal is connect with the 6th transmission electrode S6 of third transistor T3, is transmitted across for receiving third transistor T3
The constant current signal Is come；Other two input terminal is correspondingly connected with first end (i.e. two pole of photoelectricity of the first branch circuit 2221
The cathode of pipe D1 and the first pole plate of first capacitor c1) and the second branch circuit 2222 first end (i.e. the of the second capacitor c2
One pole plate)；Two output ends are according to the electric signal Vp of the first end of the first branch circuit 2221 and the second branch circuit 2222
Constant current signal Is is converted to two different current signal Ip and In, and the two different electricity by the electric signal Vn of first end
Flow the amplitude that the sum of signal amplitude is equal to constant current signal Is.
Specifically, which includes the 4th transistor T4 and the 5th transistor T5.4th transistor T4 and
5th transistor T5 be such as, but not limited to triode, in metal-oxide-semiconductor any one or it is several.By taking metal-oxide-semiconductor as an example, the 4th crystal
Pipe T4 includes the 4th coordination electrode C4, the 7th transmission electrode S7 and the 8th transmission electrode S8, wherein the 4th coordination electrode C4 is MOS
The grid of pipe, the 7th transmission electrode S7 are the drain electrode of metal-oxide-semiconductor, and the 8th transmission electrode S8 is the source electrode of metal-oxide-semiconductor.5th transistor T5
Including the 5th coordination electrode C5, the 9th transmission electrode S9, the tenth transmission electrode S10, wherein the 5th coordination electrode C5 is metal-oxide-semiconductor
Grid, the 9th transmission electrode S9 are the drain electrode of metal-oxide-semiconductor, and the tenth transmission electrode S10 is the source electrode of metal-oxide-semiconductor.
First end (such as the first capacitor c1 of the 4th coordination electrode C4 of 4th transistor T4 and the first branch circuit 2221
The first pole plate) connection；7th transmission electrode S7 is connect with the 6th transmission electrode S6 of third transistor T3, for receiving third
The constant current signal Is that transistor T3 is transmitted；8th transmission electrode S8 is connect with the first output end Out1, for exporting
One current signal Ip.The first end (such as second of the 5th coordination electrode C5 of 5th transistor T5 and the second branch circuit 2222
The first pole plate of capacitor c2) connection；9th transmission electrode S9 is connect with the 6th transmission electrode S6 of third transistor T3, for connecing
Receive the constant current signal Is that third transistor T3 is transmitted；Tenth transmission electrode S10 is connect with second output terminal Out2, is used
In another current signal In of output.
Further, the 4th transistor T4 and the 5th transistor T5 form a differential pair tube, when the of the 4th transistor T4
When voltage Vp on four coordination electrode C4 and the voltage Vn on the 5th coordination electrode C5 of the 5th transistor T5 are equal, the differential pair
Pipe is in equilibrium state, and the tenth transmission electrode S10 of the 8th transmission electrode S8 and the 5th transistor T5 of the 4th transistor T4 are defeated
The equal current signal of amplitude out.As the voltage Vp and the 5th transistor T5 on the 4th coordination electrode C4 of the 4th transistor T4
For voltage Vn on 5th coordination electrode C5 there are when pressure difference, which exports the different differential electric signal of two amplitudes.Pass through
The different differential electric signal of two amplitude is input to two input terminals of difference amplifier, it is hereby achieved that corresponding amplification electricity
Signal.
Referring to figure 3., the photosensitive pixel 22 that Fig. 3 shows Fig. 2 executes signal sequence when light sensing at each node, wherein
Vp is the voltage signal on the first pole plate of photodiode D1 cathode and first capacitor c1；Vn is second the first pole plate of capacitor c2
On voltage signal；The current signal that the 8th transmission electrode S8 that Ip is the 4th transistor T4 is exported, In are the 5th transistor T5
The tenth transmission electrode S10 output current signal.
The t1 moment inputs the first scanning drive signal, the first transistor T1 and second transistor by first input end In1
T2 is connected according to high level signal.
When the first transistor T1 conducting, reference signal Vref is transmitted through the first transmission electrode S1 and the second transmission electrode S2
To photodiode D1 cathode and first capacitor c1 the first pole plate on.Since there is an equivalent electricity inside photodiode D1
Hold, therefore reference signal Verf charges to the equivalent capacity inside photodiode D1, so that photodiode D1
Cathode on voltage Vp be gradually increasing and remained unchanged after the voltage value for reaching reference signal Vref.In addition, reference signal
Vref also charges to first capacitor c1, so that the voltage on the first pole plate of first capacitor c1 is gradually increasing and is reaching
It is remained unchanged after to the voltage value of reference signal Vref.
When second transistor T2 conducting, reference signal Vref is transmitted through third transmission electrode S3 and the 4th transmission electrode S4
To the first pole plate of the second capacitor c2, thus charge to the second capacitor c2, the electricity on the second pole plate of the second capacitor c2
Pressure Vn is gradually increasing and remains unchanged after the voltage value for reaching reference signal Vref.
At the t2 moment, the first scanning drive signal switchs to low level signal by high level signal, therefore first input end In1 becomes
For low level signal, the first transistor T1 and second transistor T2 are turned off.When the first transistor T1 cut-off when, equivalent capacity and
Discharge loop is formed between first capacitor c1 and photodiode D1.Photosensitive unit 222 starts to execute light sensing.At this point, if light
There is optical signal irradiation on electric diode D1, then generates the current signal directly proportional to optical signal inside photodiode D1, therefore
Voltage Vp on photodiode D1 cathode is gradually decreased.Moreover, optical signal is stronger, the speed that voltage Vp is reduced is faster.When
When two-transistor T2 ends, since the second capacitor c2 can not form discharge loop, on the first pole plate of the second capacitor c2
Voltage Vn is remained unchanged.
At the t3 moment, by the second input terminal In2 input/output control signal, third transistor T3 is led according to high level signal
Logical, constant current signal Is is transmitted to conversion circuit 2231.Conversion circuit 2231 is exported according to the pressure difference of voltage Vp and voltage Vn
The different current signal of two amplitudes.With the decline of voltage Vp, the pressure difference between voltage Vn and voltage Vp is increasing, thus
Differential pair tube exports the different current signal of two amplitudes.As shown in figure 3, the current signal Ip of the first output end Out1 output
Amplitude declines with the decline of voltage Vp again after gradually rising up to the corresponding current value of voltage Vp by low level, due to differential pair tube
Characteristic, the amplitude of current signal In of second output terminal Out2 output gradually rises up to the corresponding electric current of voltage Vn by low level
Rise after value with the decline of current signal Ip.Moreover, if the two paths of differential signals exports after being input in difference amplifier
Electric signal then compare electric signal all the way and be exaggerated one times, to have the function that signal amplifies.
At the t4 moment, output control signal switchs to low level signal by high level signal, therefore the second input terminal In2 becomes low
Level signal, then third transistor T3 ends, and the first output end Out1 and second output terminal Out2 stop output electric signal, becomes
Low level signal.The second predetermined time Δ t1 is defined as between above-mentioned t4 moment and t3 moment, during this period of time, by from
Corresponding current signal is obtained at one output end Out1 and second output terminal Out2, and according to the two-way current signal, can be obtained
Photosensitive unit 222 executes light sensing and the size of photoreceptor signal that generates, and then generate the biological information of target object.
Further, above-mentioned second predetermined time Δ t1 can be fixed value, or changing value.Due to two pole of photoelectricity
The optical signal that pipe D1 is received is bigger, and the reduction speed of voltage Vp is faster, therefore, to realize accurately and effectively obtaining for photoreceptor signal
It takes, the size of Δ t1 is adjusted according to the intensity of the optical signal received.Specifically, light signal strength is bigger, then Δ t1 is shorter；Light
Signal strength is smaller, then Δ t1 is longer.
Further, the interval between above-mentioned t3 moment and t2 moment cannot be too long, can not be too short, to guarantee photosensitive letter
It number timely and effectively exports.Because when the t2 moment, photosensitive unit 222 starts to execute light sensing, i.e., corresponding electric signal will be generated,
The timely output of interval time too long possible photoreceptor signal, interval time, too short possible photosensitive unit 222 had not enough time to
The photoreceptor signal of effect, the electric signal that can control the generation of photosensitive unit 222 timely and effectively export.
The photosensitive pixel 22 of the utility model embodiment is controlled by the output of photoreceptor signal, can guarantee photoreceptor signal and
When effectively export, and by conversion circuit 2231 so that photosensitive unit 222 execute light sensing and the current signal that generates with
The mode of two paths of differential signals exports, to realize the amplification of electric signal, improves the sensing precision of photosensitive device 20.Separately
Outside, since the two paths of differential signals is current signal, the output of opposite voltage signal improves the anti-interference ability of signal,
Further improve the sensing precision of photosensitive device 20.
Further, it is shown in the photosensitive device of another embodiment of the utility model referring to Fig. 4, Fig. 4, photosensitive pixel
With the connection structure between scan line, data line and signal reference line, and the photosensitive pixel be Fig. 3 shown in circuit structure.
Photosensitive device 20 further comprises the scanline groups being electrically connected with multiple photosensitive pixels 22, data line group, signal reference line group.
Wherein, scanline groups include by a plurality of first scanline groups at the first scanline groups and by a plurality of second scanline groups at
Two scanline groups, data line group include a plurality of first data line, a plurality of second data line, a plurality of third data line, signal reference
Line group includes a plurality of signal reference line.By taking the photosensitive array 201 in Fig. 1 as an example, in the photosensitive array 201, a line in X-direction
Photosensitive pixel includes spaced n photosensitive pixel 22, and the column photosensitive pixel in Y-direction includes spaced m sense
Light pixel 22, therefore the photosensitive array 201 includes m*n photosensitive pixel altogether.The scanline groups that are connect with photosensitive pixel 22, number
It is correspondingly arranged according to the quantity of line group, signal reference line group.Specifically, the first scanline groups include m articles of the first scan line, m articles
Two scan lines, and first scan line of m item is alternatively arranged along Y-direction, such as G11, G12 ... G1m, second scan line of m item
It is alternatively arranged along Y-direction, such as G21, G22 ... G2m.Signal reference line group includes m bars reference line, and the m bars is joined
Line is examined to be alternatively arranged along Y-direction, such as L1, L2 ... Lm.Data line group includes the first data line of n item, the second data line of n item, n
Third data line, and first data line of n item is alternatively arranged in X direction, such as S11, S12 ... S1n；Second data of n item
Line is also alternatively arranged in X direction, such as S21, S22 ... S2n；The n third data line is also alternatively arranged in X direction, such as
S31,S32,…S3n.Certainly, the scanline groups, data line group of photosensitive device 20 and signal reference line group may be other rule
Then mode is distributed or non-regular is distributed.In addition, due to the first scan line, the second scan line, signal reference line and the first number
Pass through insulation material between each route for all having electric conductivity according to line, the second data line, third data line, therefore being in the crossed position
Material is isolated.
Specifically, the first scan line of m item correspondence is connect with the first input end In1 of multiple photosensitive pixels 22, and m item second is swept
It retouches line correspondence to connect with the second input terminal In2 of multiple photosensitive pixels 22, m bars reference line correspondence and multiple photosensitive pixels 22
The In3 connection of third input terminal, the first data line of n item correspondence is connect with the first output end Out1 of multiple photosensitive pixels 22, n item
Second data line is corresponding to be connect with the second output terminal Out2 of multiple photosensitive pixels 22, third data line and photosensitive pixel 22 the
Four input terminal In4 connections.Wherein, the first scan line, the second scan line, signal reference line are drawn from X-direction, the first data
Line and the second data line are then drawn from Y-direction.
In some embodiments, photosensitive device 20 further comprises photosensitive driving circuit, which is used for
One first scanning drive signal is provided to multiple photosensitive pixels, to drive the multiple photosensitive pixel to execute light sensing；Described
Photosensitive multiple pixels start after executing light sensing, provide one and export control signal to the multiple photosensitive pixel, so that light-sensitive image
Element receives a constant electric signal, and the electric signal that generates when executing light sensing according to the multiple photosensitive pixel, by constant telecommunications
Number two different electric signals are converted to, and exported.
Specifically, since photosensitive pixel 22 is in array distribution, photosensitive driving circuit is further used for: line by line or interlacing
Drive that multiple photosensitive pixels execute light sensings line by line or interlacing provides the first scanning drive signal to the multiple photosensitive pixel, with
It drives the multiple photosensitive pixel line by line or interlacing executes light sensing.In this way, can once drive one by the photosensitive driving circuit
Row photosensitive pixel is performed simultaneously light sensing, to accelerate sensed speed.
In some embodiments, please continue to refer to Fig. 4, which includes a photosensitive driving unit 24, sense
The first scan line, the second scan line in electro-optical device 20, signal reference line are connected to the photosensitive driving unit 24.Please refer to figure
5, Fig. 5 show the functional module of the photosensitive driving unit of one embodiment of the utility model.The photosensitive driving unit 24 includes
First driving circuit 241 of the first scanning drive signal is provided, the second driving circuit 242 of output control signal is provided and is provided
The reference circuit 243 of reference signal Vref.Each circuit of the photosensitive driving unit 24 can be integrated in a control by silicon technology
In chip, each circuit of certain photosensitive driving unit 24 can also be formed separately from different control chips.For example, first
Driving circuit 241 and the second driving circuit 242 are formed together on the same substrate with photosensitive pixel 22, and reference circuit 243 then leads to
A connection piece (for example, flexible circuit board) is crossed to connect with a plurality of signal reference line of photosensitive device 20.
In some embodiments, for reference circuit 243 for providing reference signal Vref, which passes through sense
The first switch (for example, the first transistor T1 in switch unit shown in Fig. 2 221) of light pixel 22 optionally with it is described
First branch circuit 2221 of photosensitive unit 222 is electrically connected.In first switch closure, reference signal Vref passes through closure
First switch be transmitted to the first branch circuit 2221 of corresponding photosensitive unit 222.Meanwhile the reference circuit 243 also passes through
The second switch (for example, second transistor T2 in switch unit shown in Fig. 2 221) of photosensitive pixel 22 optionally with institute
The second branch circuit 2222 for stating photosensitive unit 222 is electrically connected.In second switch closure, reference signal Vref is by closing
The second switch of conjunction is transmitted to the second branch circuit 2222 of corresponding photosensitive unit 222.
First scan line of the first driving circuit 241 and photosensitive device 20 is electrically connected, for providing the first scanning respectively
Driving signal gives the first switch and the second switch, to control first switch and the second switch closure, and in the first pre- timing
Between when reaching, control first switch and the second switch disconnects, so that photosensitive unit 222 be driven to start to execute light sensing.Optionally,
First scanning drive signal be a pulse signal, and in the pulse signal high level duration be the first predetermined time,
Such as t2-t1 shown in Fig. 3.First switch and the second switch is closed all in accordance with high level signal, is disconnected according to low level signal.
Second scan line of the second driving circuit 242 and photosensitive device 20 is electrically connected, in driving photosensitive unit 222
Start execute light sensing after, that is, first switch and the second switch disconnects and reach the 4th predetermined time (as shown in Figure 3
When t3-t2), provide export control signal give third switch, with control third switch (such as third transistor T3 shown in Fig. 2)
Closure, and when reaching the second predetermined time, control third switch disconnects, so that conversion circuit 2231 is according to photosensitive unit 222
The electric signal that light sensing generates is executed, constant current signal is converted into two different current signals, and export.Optionally, should
Output control signal is a pulse signal, and the duration of high level is the second predetermined time, such as Fig. 3 in the pulse signal
Shown in t4-t3.Third switch is closed according to high level signal, is disconnected according to low level signal.
In some embodiments, please continue to refer to Fig. 4, which further comprises signal processing unit
25, the data line group in photosensitive device 20 shown in Fig. 4 is all connected with the signal processing unit 25.Specifically, third data line example
A constant-current source (not shown) is such as connected, the constant-current source is for providing a constant current signal；First data line and the second number
A signal processing circuit (not shown) is for example connected according to line.Certainly, which can also be with photosensitive driving
Unit 24 is integrated in a processing chip.When the signal processing unit 25 is used to execute light sensing to the photosensitive unit 222
The electric signal of generation is read out, and is obtained according to the electric signal of reading in contact with or close to the target object of the photosensitive device
Predetermined biological information.The signal processing unit 25 can be integrated in a detection chip by silicon technology.It is understood that
It is that, in order to collect accurately and effectively electric signal, within second scheduled time, which can be to photosensitive unit
The electric signal generated when 222 execution light sensing is repeatedly read.
In some embodiments, which includes multiple treatment channels, optionally, each treatment channel
It is correspondingly connected with first data line, the second data line.So, change ground, can also each treatment channel be correspondingly connected at least
Two the first data lines, at least two the second data lines, by way of time-sharing multiplex, first data are read in selection every time
Electric signal on line and second data line, the then telecommunications on another the first data line of reselection and the second data line
Number, and so on, until the electric signal on all first data lines and the second data line is read.So, it is possible to reduce place
The number for managing channel, to save the cost of photosensitive device 20.
Fig. 6 is please referred to, Fig. 6 has gone out another circuit structure of a photosensitive pixel 22 in Fig. 1.The utility model embodiment party
A photosensitive pixel 22 in formula has first input end In1 ', the second input terminal In2 ', third input terminal In3 ', the 4th input terminal
In4 ', the 5th input terminal In5 and one first output end Out1 ', second output terminal Out2 '.It includes that light sensing, which controls signal,
One scanning drive signal and the second scanning drive signal.The photosensitive pixel 22 includes 221 ' of switch unit, 222 ' of photosensitive unit
With 223 ' of signal output unit.Wherein, 221 ' of switch unit receives a reference signal Vref by third input terminal In3 ', separately
Outside, 221 ' of switch unit also passes through first input end In1 ' one first scanning drive signal of reception, and passes through the 5th input terminal
In5 receives one second scanning drive signal, and when receiving the first scanning drive signal and the second scanning drive signal, will join
2222 ' of 2221 ' of the first branch circuit and the second branch circuit that signal Vref is transmitted separately to 222 ' of photosensitive unit is examined, with driving
222 ' of photosensitive unit executes light sensing.When 222 ' of photosensitive unit executes light sensing, for receiving optical signal, and light letter is being received
Number when the optical signal received is converted into corresponding electric signal.Light sensing is executed in 222 ' of photosensitive unit and continues one in advance
Terminate light sensing after fixing time, and is latched to the photoreceptor signal that light sensing generates is executed.Light sensing control signal is provided
Meanwhile output control signal being provided, i.e. 223 ' of signal output unit receives a constant current signal by the 4th input terminal In4 '
Is, and the output is received by the second input terminal In2 ' and controls signal, so that constant current signal Is is transmitted to conversion electricity
2231 ' of road, 2231 ' of conversion circuit are according to 2222 ' of electric signal and the second branch circuit of the first end of 2221 ' of the first branch circuit
First end electric signal, constant current signal Is is converted into two different current signals, and corresponding from the first output end
Out1 ', second output terminal Out2 ' output.
Optionally, the first scanning drive signal and the second scanning drive signal, output control signal are a pulse signal,
And first duration of high level signal in scanning drive signal be the first predetermined time, high level letter in output control signal
Number duration be the second predetermined time, the duration of high level signal is the pre- timing of third in the second scanning drive signal
Between, and the third predetermined time was greater than for the first predetermined time.
Specifically, the structure of 222 ' of photosensitive unit in present embodiment and 223 ' of signal output unit with it is shown in Fig. 2
Photosensitive unit 222 is consistent with the structure of signal output unit 223, and details are not described herein.221 ' of switch unit is in addition to including Fig. 2 institute
Outside 221 structure of switch unit shown, the 6th transistor T6 is still further comprised.6th transistor T6 is such as, but not limited to three poles
Pipe, metal-oxide-semiconductor, in thin film transistor (TFT) any one or it is several.By taking metal-oxide-semiconductor as an example, the 6th transistor T6 includes the 6th control
Electrode C6, the 11st transmission electrode S11 and the 12nd transmission electrode S12, wherein the 6th coordination electrode C6 is the grid of metal-oxide-semiconductor,
11st transmission electrode S11 is the drain electrode of metal-oxide-semiconductor, and the 12nd transmission electrode S12 is the source electrode of metal-oxide-semiconductor.6th coordination electrode C6
It is connect with the 5th input terminal In5, for receiving the second scanning drive signal；11st transmission electrode S11's and first capacitor c1
The first electrode (such as cathode of photodiode) of the connection of first pole plate, the 12nd transmission electrode S12 and sensor devices connects.
And the first pole plate of first capacitor c1 is used for 223 ' of connection signal output unit, i.e. the first pole plate of first capacitor c1 and conversion
The 4th coordination electrode C4 connection of 4th transistor T4 in 2231 ' of circuit.
Fig. 7 is please referred to, the photosensitive pixel 22 that Fig. 7 shows Fig. 6 executes signal sequence when light sensing, and wherein Vp is first
Voltage on voltage on the first pole plate of capacitor c1, that is, photodiode D1 cathode；Vn is the first of the second capacitor c2
Voltage on pole plate；In is the current signal of the first output end Out1 ' output, and Ip is the electric current of second output terminal Out2 ' output
Signal.
The t1 moment inputs the first scanning drive signal by first input end In1 ', while defeated by the 5th input terminal In5
Enter the second scanning drive signal.The first transistor T1 and second transistor T2 are connected according to high level signal, the 6th transistor T6
It is connected according to high level signal.
When the first transistor T1 conducting, reference signal Vref is transmitted through the first transmission electrode S1 and the second transmission electrode S2
To the cathode of photodiode D1.Due to having an equivalent capacity inside photodiode D1, Verf pairs of reference signal
Equivalent capacity inside photodiode D1 charges, so that the voltage on the cathode of photodiode D1 is gradually increasing
And it is remained unchanged after the voltage value for reaching reference signal Vref.Meanwhile when the 6th transistor T6 conducting, reference signal Vref
It is transmitted on the first pole plate of first capacitor c1 after the first transistor T1, then through the 6th transistor T6, thus to the first electricity
Hold c1 to charge, the voltage Vp on the first pole plate of first capacitor c1 is gradually increasing and in the voltage for reaching reference signal Vref
It is remained unchanged after value.
When second transistor T2 conducting, reference signal Vref is transmitted through third transmission electrode S3 and the 4th transmission electrode S4
To the first pole plate of the second capacitor c2, thus charge to the second capacitor c2, the electricity on the first pole plate of the second capacitor c2
Pressure Vn is gradually increasing and remains unchanged after the voltage value for reaching reference signal Vref.
T2 moment, the first scanning drive signal switch to low level by high level, and the second scanning drive signal remains as high electricity
Ordinary mail number.Therefore, first input end In1 ' becomes low level signal, and the 5th input terminal In5 remains as high level signal, then and first
Transistor T1 and second transistor T2 are turned off, and the 6th transistor T6 is still connected, at this time first capacitor c1 and photodiode
D1 forms discharge loop, i.e. first capacitor c1 discharges to photodiode D1, the electricity on the first pole plate of first capacitor c1
Pressure Vp is gradually reduced.If no optical signal irradiation on photodiode D1, the electric current inside photodiode D1 is very weak, so
Voltage Vp on the first pole plate of first capacitor c1 is held essentially constant；If having optical signal irradiation, light on photodiode D1
The current signal directly proportional to optical signal is generated inside electric diode D1, and optical signal is stronger, what photodiode D1 was generated
Electric current is bigger, therefore the decrease speed of the voltage Vp on the first pole plate of first capacitor c1 is faster.When second transistor T2 ends
When, the second capacitor c2 can not form discharge loop, then the voltage Vn on the first pole plate of the second capacitor c2 will remain unchanged as, that is, tie up
It is constant to hold reference signal Vref.
T3 moment, the second scanning drive signal switch to low level signal by high level signal.Therefore, the 5th input terminal In5
Become low level signal, the 6th transistor T6 cut-off, first capacitor c1 can not form discharge loop, then the first of first capacitor c1
Voltage Vp on pole plate will be remained unchanged, and so then latch 222 ' of the photosensitive unit photoreceptor signal obtained.
At the t4 moment, by the second input terminal In2 ' input/output control signal, which controls signal as high level letter
Number.Since output control signal is high level signal, third transistor T3 conducting, 2231 ' of conversion circuit is by constant current signal
Two electric signals are converted to, and are exported.If voltage Vp is consistent with the amplitude of voltage Vn, at the differential pair tube of 2231 ' of conversion circuit
In equilibrium state, the electric signal of the first output end Out1 ' output and the electric signal of second output terminal Out2 output are equal.If voltage
The amplitude of Vp and voltage Vn are inconsistent, that is, there is certain difference, then the differential pair tube of 2231 ' of conversion circuit exports two amplitudes
Different current signals.And the sum of amplitude of two current signals is equal to the amplitude of constant current signal.Due to photosensitive unit
After 222 ' execute light sensing, the electric signal Vp of 2221 ' first end of the first branch circuit is gradually reduced, and the second branch circuit
The electric signal Vn of 2222 ' first ends then maintains Vref constant, then between electric signal Vn and electric signal Vp there are pressure difference, and electric signal
Vp declines more, then pressure difference is bigger.As shown in fig. 7, due to since the t3 moment, the 6th transistor T6 cut-off, voltage Vp because
First capacitor cl remains unchanged, and voltage Vn also remains unchanged because of the second capacitor c2.Therefore, t4 moment third transistor t3 is connected,
The amplitude of the current signal Ip of first output end Out1 ' output is corresponding with the amplitude of electric signal Vp, second output terminal Out2 output
Current signal In it is corresponding with the amplitude of electric signal Vn.Moreover, because the voltage of electric signal Vp declines, therefore current signal In
Current amplitude when amplitude compares equilibrium state rises, under the current amplitude when amplitude of current signal Ip is compared to equilibrium state
Drop.The electric signal that two paths of differential signals Ip, In exports after being input in difference amplifier is then compared electric signal all the way and is exaggerated
One times, to have the function that signal amplifies.
At the t5 moment, output control signal switchs to low level signal by high level signal, therefore the second input terminal In2 ' becomes
Low level signal, third transistor T3 cut-off, then the first output end Out1 ' and second output terminal Out2 ' stops output electric signal,
Become low level signal.It, will be defeated from the first output end Out1 ' and second in this period between t5 moment and t4 moment
Corresponding current signal is read at outlet Out2 ', and according to the two-way current signal, be can be obtained 222 ' of photosensitive unit and executed light
The current signal for sensing and generating, and then obtain the biological information of target object.
Further, in the third predetermined time Δ t2 between above-mentioned t3 moment and t2 moment, 222 ' of photosensitive unit is executed
Light sensing, and latch the electric signal generated when executing light sensing at the t3 moment.Moreover, third predetermined time Δ t2
It can be fixed value, or changing value.Since the optical signal that photodiode D1 is received is bigger, the reduction speed of voltage Vp
Degree is faster, therefore, for the accurately and effectively acquisition for realizing photoreceptor signal, adjusts Δ t2's according to the intensity of the optical signal received
Size.Specifically, light signal strength is bigger, then Δ t2 is shorter；Light signal strength is smaller, then Δ t2 is longer.
Further, since the photoreceptor signal generated when 222 ' of photosensitive unit executes light sensing is latched, the t4 moment
Interval between the t3 moment can be with flexible setting, and all 222 ' of photosensitive unit may be performed simultaneously light sensing, so that
Control sequential is simple, and the time of entire photosensitive reading is short, is conducive to shorten the sensing time, improves user experience.Optionally,
To prevent from reading the charge leakage of latch signal in waiting process, terminates to execute light sensing and arrive in each 222 ' of photosensitive unit
When up to the 5th predetermined time (such as t4-t3), the signal output of latch is controlled.
Since in the utility model embodiment, 221 ' of switch unit is used not only for driving 222 ' of photosensitive unit and executes light sensation
The electricity generated when surveying, but also control 222 ' of photosensitive unit to terminate to execute light sensing, and 222 ' of photosensitive unit being executed light sensing
Signal is latched, therefore can be performed simultaneously light sensing or even all photosensitive pixels simultaneously in the photosensitive pixel that do not go together
Light sensing is executed, so that the output control to photoreceptor signal provides time enough and flexibility.In addition, photosensitive pixel 22
By the structure of differential pair tube, so that 222 ' of photosensitive unit executes light sensing and the current signal that generates is with two paths of differential signals
Mode exports, so that the amplification of electric signal is realized, along with the two paths of differential signals is current signal with respect to voltage signal
Output, improve the anti-interference ability of signal, therefore improve the sensing precision of photosensitive device 20.
In some embodiments, referring to Fig. 8, the difference with the photosensitive pixel 22 shown in Fig. 6 is: the utility model is real
It applies in the photosensitive pixel 22 in mode, the first pole plate of the second transmission electrode S2 and first capacitor c1 of the first transistor T1 connect
It connects.After the first transistor T1 and second transistor T2 cut-off, due to the characteristic of transistor, even if transistor is in cut-off shape
State, which can also have certain leaky, therefore the Partial charge on the second capacitor c2 will be from second transistor T2
Place leaks out, and thus will cause to leak electricity unbalance.In this regard, the utility model embodiment is connected to the first electricity by the first transistor T1
Hold the first pole plate of c1, so that after the first transistor T1 and second transistor T2 cut-off, even if there are leaky, first
The electric leakage of capacitor c1 and the second capacitor c2 are consistent, that is, solve the problems, such as that electric leakage is unbalance, improve the sensing essence of photosensitive device 20
Degree.
Further, referring to Fig. 9, photosensitive device 20 further include the scanline groups being electrically connected with multiple photosensitive pixels 22,
Data line group, signal reference line group.Wherein, scanline groups include by a plurality of first scanline groups at the first scanline groups, by
A plurality of second scanline groups at the second scanline groups and by a plurality of third scanline groups at third scanline groups, data line group
Including multiple data lines, signal reference line group includes a plurality of signal reference line.By taking the photosensitive array 201 in Fig. 1 as an example, photosensitive battle array
In column 201, X-direction lastrow photosensitive pixel includes spaced n photosensitive pixel 22, the column photosensitive pixel in Y-direction
Including spaced m photosensitive pixel 22, therefore the photosensitive array 201 includes m*n photosensitive pixel 22 altogether.Accordingly,
First scanline groups include the first scan line of m item, and first scan line of m item is alternatively arranged along Y-direction, such as G11, G12 ...
G1m；Second scanline groups include the second scan line of m item, and second scan line of m item is also alternatively arranged along Y-direction, such as G21,
G22,…G2m；Third scanline groups include m third scan line, and the m third scan line is also alternatively arranged along Y-direction, example
As G31, G32 ... G3m；Signal reference line group includes m bars reference line, and the m bars reference line is arranged along Y-direction interval
Column, such as L1, L2 ... Lm；Data line group includes n data line, and the n data line is alternatively arranged in X direction, such as Sn1,
Sn2,…Sn-1,Sn.Certainly, the scanline groups, data line group of photosensitive device 20 and signal reference line group may be other rule
Then mode is distributed or non-regular is distributed.In addition, due to the first scan line, the second scan line, third scan line, signal reference
Line and data line are conductive, therefore the first scan line, the second scan line, the third scan line, signal being in the crossed position
It is isolated between reference line and data line by insulating materials.
Specifically, the first scan line is connect with the first input end In1 ' of photosensitive pixel 22, the second scan line and light-sensitive image
Second input terminal In2 ' connection of element 22, signal reference line are connect with the third input terminal In3 ' of photosensitive pixel 22, third scanning
Line is connect with the 5th input terminal In5 of photosensitive pixel 22, and the first output end Out1 ' of the first data line and photosensitive pixel 22 connects
It connects, the second data line is connect with the second output terminal Out2 ' of photosensitive pixel 22, and the 4th of third data line and photosensitive pixel 22 is defeated
Enter to hold In4 ' connection.Wherein, in order to be routed conveniently, the first scan line, the second scan line, third scan line, signal reference line are equal
It is drawn from X-direction, the first data line, the second data line, third data line are drawn from Y-direction.
In some embodiments, the photosensitive driving circuit of photosensitive device 20 is further used for: providing one first scanning and drives
Dynamic signal and the second scanning drive signal give multiple photosensitive pixels, so that the multiple photosensitive pixel is reached in the first predetermined time
When start execute light sensing, the third predetermined time reach when terminate execute light sensing, by the photosensitive pixel execute light sensing
When the electric signal that generates latch；After the photosensitive pixel terminates to execute light sensing, output control signal is provided, so that photosensitive
Constant electric signal is converted to two different electric signals, and export according to the electric signal of latch by pixel.
Further, multiple photosensitive pixels 22 are in array distribution, which is further used for: line by line or interlacing
First scanning drive signal and the second scanning drive signal are provided to the multiple photosensitive pixel, to drive the multiple sense
Light pixel is line by line or interlacing executes light sensing；Alternatively, providing first scanning drive signal and the second turntable driving letter simultaneously
Number give all photosensitive pixels, to drive all photosensitive pixels to be performed simultaneously light sensing.In this way, passing through the photosensitive driving circuit
A line photosensitive pixel or even all photosensitive pixels can be once driven to be performed simultaneously light sensing, to accelerate sensed speed.
Further, with continued reference to Fig. 9, which includes a photosensitive driving unit 24, the first scan line, the
Two scan lines, third scan line, signal reference line are connected to the photosensitive driving unit 24.Specifically, Figure 10 is please referred to, the sense
Optical drive unit 24 includes 241 ' of the first driving circuit for providing the first scanning drive signal, provides the second of output control signal
242 ' of driving circuit, 243 ' of electrical reference signal road for providing reference signal Vref and the third for providing the second scanning drive signal are driven
Dynamic circuit 244.Wherein, each circuit of the photosensitive driving unit 24 can be integrated in a control chip by silicon technology, certainly
Each circuit of the photosensitive driving unit 24 can also be formed separately.For example, 241 ' of the first driving circuit and the second driving circuit
242 ', third driving circuit 244 and photosensitive pixel 22 are formed together on the same substrate, and 243 ' of electrical reference signal road then passes through soft
Property circuit board is connect with a plurality of signal reference line on photosensitive device 20.
In some embodiments, for providing reference signal Vref, 243 ' of the reference circuit passes through 243 ' of reference circuit
Photosensitive pixel 22 the 4th switch (for example, the first transistor T1 in 221 ' of switch unit shown in fig. 6) optionally with
2221 ' of the first branch circuit of 222 ' of photosensitive unit is electrically connected.When the 4th closes the switch, reference signal Vref is logical
The 4th switch for crossing closure is transmitted to 2222 ' of the first branch circuit of 222 ' of photosensitive unit.Meanwhile 243 ' of the reference circuit is also logical
Cross the 5th switch (for example, second transistor T2 in 221 ' of switch unit shown in fig. 6) of photosensitive pixel 22 optionally
It is electrically connected with 2222 ' of the second branch circuit of 222 ' of photosensitive unit.When the 5th closes the switch, reference signal Vref
2222 ' of the second branch circuit of 222 ' of photosensitive unit is transmitted to by the 5th switch of closure.
First scan line of 241 ' of the first driving circuit and photosensitive device 20 is electrically connected, for providing the first turntable driving
Signal is electrically connected to the 4th switch and the 5th switch, third driving circuit 244 and the third scan line of photosensitive device 20, is used for
The first driving circuit provide the first scanning drive signal while, provide the second scanning drive signal to the 7th switch (such as
The 6th transistor T6 of 221 ' of switch unit shown in fig. 6), it is closed the switch with the 4th switch of control, the 5th switch and the 7th, and
When reaching the first predetermined time, the 4th switch of control and the 5th switch are disconnected, so that 222 ' of photosensitive unit be driven to start to execute
Light sensing；When reaching the third predetermined time, the 7th switch of control is disconnected, so that controlling 222 ' of photosensitive unit terminates to execute light sensation
It surveys, and is latched by the photoreceptor signal that first capacitor c1 generates 222 ' of the photosensitive unit.
Second scan line of 242 ' of the second driving circuit and photosensitive device 20 is electrically connected, in control photosensitive unit
222 terminate after executing light sensing, such as disconnect and reach the 5th predetermined time (t4 moment as shown in Figure 7) in seven switches, mention
For exporting control signal to the 6th switch, to control the 6th switch, (such as the third of 223 ' of signal output unit shown in fig. 6 is brilliant
Body pipe T3) closure, and when reaching the second predetermined time, the 6th switch of control disconnects.In second predetermined time, conversion circuit
The electric signal that 2231 ' are generated when executing light sensing according to 222 ' of photosensitive unit, is converted to two different electricity for constant current signal
Signal is flowed, and is exported.
In some embodiments, please continue to refer to Fig. 9, which further comprises signal processing unit
25, the data line in photosensitive device 20 shown in Fig. 9 is all connected with the signal processing unit 25, which can pass through
Silicon technology is integrated in a detection chip.Certainly, which can also be integrated in photosensitive driving unit 24
In one processing chip.Specifically, the signal processing unit 25 is for reading photosensitive pixel 22 from the first output end Out1 ' and the
The current signal of two output end Out2 ' output, and the mesh in contact with or close to the photosensitive device is obtained according to the electric signal of reading
Mark the predetermined biological information of object.It is understood that due to the telecommunications generated when 222 ' of photosensitive unit executes light sensing
It number is latched, therefore provides more sufficient time and flexibility to the signal-obtaining of signal processing unit 25, while also saving
The sensing time has been saved, sensed speed is accelerated.In addition, in order to collect accurately and effectively electric signal, within second scheduled time,
The electric signal that the signal processing unit 25 generates when can execute light sensing to 222 ' of photosensitive unit is repeatedly read.
In some embodiments, which includes multiple treatment channels, optionally, each treatment channel
It is correspondingly connected with a data line.So, change ground, can also each treatment channel be correspondingly connected at least two data lines, pass through
The mode of time-sharing multiplex, the electric signal on a data line is read in selection every time, then the electricity on another data line of reselection
Signal, and so on, until the electric signal on all data lines is read.So, it is possible to reduce the number for the treatment of channel, from
And save the cost of photosensitive device 20.
In some embodiments, Figure 11 is please referred to, Figure 11 shows the photoreceptor cartridge of another embodiment of the utility model
The structure set.The photosensitive device 20 further comprises a photosensitive panel 200, which includes a substrate 26 again, multiple
Photosensitive pixel 22 is set in the substrate 26.Optionally, which is in array distribution.The photosensitive pixel 22 is for receiving
The optical signal that top is come, and the optical signal received is converted into corresponding electric signal, therefore multiple photosensitive pixels 22 is photosensitive
Region deviding forms sensing region 203, and the region other than sensing region 203 is then non-sensing region 202.In order to facilitate route cloth
If the non-sensing region 202 is for being arranged driving circuit needed for photosensitive pixel 22 executes light sensing, or the electron-donating company of setting
The line bonding area of fitting connection.The even whole circuits of the partial circuit of above-mentioned photosensitive driving circuit may be provided in substrate 26.
For example, the first driving circuit 241 and the second driving circuit 242, reference circuit 243 are equal by taking photosensitive device 20 shown in Fig. 4 as an example
It is formed in substrate 26.Alternatively, the first driving circuit 241, the second driving circuit 242, reference circuit 243 are by being electrically connected part
(for example, flexible circuit board) and photosensitive pixel 22 are electrically connected.
In some embodiments, above-mentioned signal processing unit 25 can be that selection is formed in substrate according to the type of substrate 26
On 26, or selection is for example electrically connected by being electrically connected part (for example, flexible circuit board) and photosensitive pixel 22.For example, working as
When the substrate 26 is silicon base, the signal processing unit 25 be may be optionally formed in substrate 26, and also alternative such as passes through
Flexible circuit board and photosensitive pixel 22 are electrically connected；When the substrate 26 is dielectric base, the signal processing unit 25 is then
It needs for example to be electrically connected by flexible circuit board and photosensitive pixel 22.
In some embodiments, which is a sensitive chip, for sensing in contact with or close to photosensitive device
The biological information of 20 target object.Optionally, which is a fingerprint sensing chip, for sensing user hand
The fingerprint image of finger.
Further, 2 and Figure 13, Figure 12 show the knot of the electronic equipment of one embodiment of the utility model referring to Fig.1
Structure, Figure 13 shows electronic equipment shown in Figure 12 along the cross-section structure of I-I line, and Figure 13 illustrates only the portion of electronic equipment
Separation structure.The electronic equipment includes above-mentioned any one photosensitive device for implementing structure, and not only image for electronic equipment was shown, but also
It is sensed for the biological information to the target object in contact with or close to electronic equipment.
Electronic equipment for example but is not limited to consumer electrical product, household formula electronic product, vehicular electronic product, gold
Melt the electronic product of the suitable types such as end product.Wherein, consumer electrical product for example mobile phone, tablet computer, notebook electricity
Brain, tabletop display, computer all-in-one machine etc..Household formula electronic product for example intelligent door lock, TV, refrigerator, wearable device etc..
Vehicular electronic product for example automatic navigator, vehicle-carrying DVD etc..Financial terminal product for example ATM machine, self-service transacting business end
End etc..For electronic equipment shown in Figure 12 by taking the mobile terminal of cell phone type as an example, right above-mentioned biological sensing mould group is equally applicable to it
Its suitable electronic product, it is not limited to the mobile terminal of cell phone type.
Specifically, the front of the mobile terminal 3 is equipped with a display device (not shown), which includes a display surface
Plate 300 is equipped with cover sheet 400 above the display panel 300.Optionally, the screen of the display panel 300 accounts for relatively high, such as
80% or more.Screen accounting refers to that the display area 305 of display panel 300 accounts for the ratio of the front surface region of mobile terminal 3.This is photosensitive
Photosensitive panel 200 is a panel construction being adapted to display panel 300 in device 20 (referring to fig. 4 and Fig. 9), and is correspondingly arranged at
The lower section of the display panel 300.If the display panel 300 is flexible curved surface shape, which is also flexible curved surface
Shape.Therefore, the photosensitive panel 200 and planar structure is not only indicated, or curved-surface structure.In this way, being convenient for photosensitive panel 200
Stacking with display panel 300 assembles.
Since photosensitive panel 200 is located at 300 lower section of display panel, display panel 300 has to be reflected for target object
The transmission region that optical signal back passes through, so that photosensitive panel 200 can receive the light letter across display panel 300
Number, and the optical signal received is converted into electric signal, it is obtained according to the electric signal after conversion in contact with or close to electronic equipment
The predetermined biological information of target object.
In the utility model embodiment, the electronic equipment is in addition to photosensitive device 20 described in above embodiment
Effect outside, also using display panel 300 issue optical signal realize target object biological information sense, do not need volume
Outer setting light source to not only save the cost of electronic equipment, and also achieves docking touching or touch display panel 300
Target object carries out biological information sensing in display area 305.In addition, after the photosensitive device 20 can be separately made, then
The assembling for carrying out electronic equipment, to accelerate the preparation of electronic equipment.
When mobile terminal 3 is in bright screen state and is in biological information sensing modes, the display panel 300 hair
Optical signals.When an object is in contact with or close to the viewing area, which receives is believed by the reflected light of the object
Number, the optical signal received is converted as corresponding electric signal, and is believed according to the predetermined biological characteristic that the electric signal obtains the object
Breath, for example, information in fingerprint.To which the photosensitive device 20 can be realized to the mesh in contact with or close to display area any position
Mark object is sensed.
In some embodiments, display panel 300 is such as, but not limited to OLED display device, as long as being able to achieve display effect
Fruit and have the display device of the transmission region passed through for optical signal in the protection scope of the utility model.In addition, display surface
Plate 300 can be bottom emitting structure, emission structure at top, transparent two sides structure, moreover, the display screen can be the hard of rigid
Screen, or the flexible screen of flexible material.
In some embodiments, photosensitive panel 200 is for executing any position in the display area to display panel 300
Target object biological information sensing.For example, specifically, such as incorporated by reference to referring to Fig.1 2, Figure 13 and Figure 14, display surface
Plate 300 have a display area 305 and non-display area 306, the display area 305 by display panel 300 all display pictures
The light emitting region of element 32 is defined, and the region other than display area 305 is non-display area 306, and non-display area 306 is for being arranged
The line bonding area for driving the circuits such as the display driver circuit of display pixel 32 or setting to connect for flexible circuit board.Photosurface
Plate 200 have a sensing region 203 and non-sensing region 204, the sensing region 203 by photosensitive panel 200 all light-sensitive images
The sensing region of element 22 defines, and the region other than sensing region 203 is non-sensing region 204, and non-sensing region 204 is for being arranged
The photosensitive driving unit 24 for driving photosensitive pixel 22 to execute light sensing waits circuits or the line bonding for flexible circuit board connection
Area.The shape of sensing region 203 is consistent with the shape of display area 305, and the size of sensing region 203 is greater than or equal to display
The size in region 305, so that photosensitive panel 200 can be in contact with or close to any position in the display area of display panel 300 305
The sensing of the predetermined biological information for the target object set.Further, the area of photosensitive panel 200 is less than or equal to display
The area of panel 300, and the shape of photosensitive panel 200 is consistent with the shape of display panel 300, is so convenient for electronic equipment group
Dress.So, ground is changed, in some embodiments, the area of photosensitive panel 200 can also be greater than the area of display panel 300.
In some embodiments, the sensing region 203 of the photosensitive panel 200 also may be less than display panel 300
Display area 305, to realize the predetermined biological characteristic letter of the target object of the regional area of 300 display area 305 of display panel
The sensing of breath.
Further, display device is further used for executing touch-sensing, when the display device detects target object
Touch or close to after, the position for controlling the display panel corresponding touch area shine.
So, ground is changed, in some embodiments, please refers to Figure 15 and Figure 16, Figure 15 shows the utility model
The structure of the electronic equipment of one embodiment, Figure 16 show electronic equipment shown in figure 15 along the cross-section structure of II-II line, and
And Figure 16 illustrates only the part-structure of electronic equipment.The photosensitive mould group of the utility model embodiment is applied to a mobile terminal
3, the front of the mobile terminal is equipped with a display panel 300, is equipped with cover sheet 400 above the display panel 300.The display surface
The screen of plate 300 account for it is relatively high, such as 80% or more.It is mobile whole that screen accounting refers to that the actual displayed region 305 of display panel 300 accounts for
The ratio of the front surface region at end.One is equipped with for target object at lower position in the actual displayed region 305 of the display panel 300
The biological sensing region S of touch, to carry out the biological information sensing of target object, such as target object is finger, then should
Biological sensing region S is fingerprint identification region, to carry out fingerprint recognition.Accordingly, fingerprint knowledge is corresponded to below display panel 300
The position of other region S is equipped with a photosensitive device 20, which is used for when finger is placed in fingerprint identification region S, obtains
Take the fingerprint image of the finger.It is understood that being set in display panel 300 lower position is for the hand-held movement of user
When terminal, facilitate the position of finger touch display panel 300.It is of course also possible to be set to the other positions for facilitating finger to touch.
In some embodiments, electronic equipment further comprises a touch sensor (not shown), passes through the touching
Touch area of the target object on cover sheet 400 can be determined by touching sensor.The touch sensor uses capacitance touch sense
Survey technology, naturally it is also possible to by other means, such as resistive touch sensing, pressure-sensitive touch-sensing etc..The touch
Sensor is used to the touch area of the target object is determined, with driving when a target object contacts the cover sheet 400
The display pixel of corresponding touch area is lighted and photosensitive pixel executes light sensing.
In some embodiments, the touch sensor perhaps with the cover sheet 400 is integrated or and photosurface
Plate 200 is integrated, or integrated with display panel 300.By integrated touch sensor, the touching to target object is not only realized
Detection is touched, and also reduces the thickness of electronic equipment, is conducive to electronic equipment and develops towards lightening direction.
In the description of this specification, reference term " embodiment ", " certain embodiments ", " schematically implementation
What the description of mode ", " example ", " specific example " or " some examples " etc. meant to describe in conjunction with the embodiment or example
Particular features, structures, materials, or characteristics are contained at least one embodiment or example of the utility model.In this explanation
In book, schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, the specific spy of description
Sign, structure, material or feature can be combined in any suitable manner in any one or more embodiments or example.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-mentioned embodiment party
Formula is exemplary, and should not be understood as limiting the present invention, and those skilled in the art are in the utility model
Above embodiment can be changed, be modified in range, replacement and variant.
Claims (23)
1. a kind of photosensitive circuit, it is characterised in that: include:
Sensing unit is converted to corresponding photoreceptor signal for receiving optical signal, and by the optical signal received, to execute light sensation
It surveys；
Signal output unit, the electric signal generated when for the sensing unit to be executed light sensing are converted to two different telecommunications
Number, and export.
2. photosensitive circuit as described in claim 1, it is characterised in that: the signal output unit is further used for, according to institute
It states sensing unit and executes the electric signal generated when light sensing, a scheduled constant electric signal is converted into two different electric signals.
3. photosensitive circuit as claimed in claim 2, it is characterised in that: the scheduled constant electric signal is constant current letter
Number.
4. photosensitive circuit as described in claim 1, it is characterised in that: the sensing unit includes switch unit and photosensitive list
Member；Wherein,
The switch unit drives for receiving a reference signal and one first scanning drive signal, and receiving the first scanning
When dynamic signal, by the reference signal transmission to the photosensitive unit；
The photosensitive unit is used to receive the reference signal that the switch unit transmits, and when reaching the first predetermined time
Start to execute light sensing.
5. photosensitive circuit as claimed in claim 4, it is characterised in that: the photosensitive unit includes the first branch circuit and second
The optical signal received is converted to corresponding electric signal for receiving optical signal by branch circuit, first branch circuit；
Second branch circuit is used to maintain the voltage of the second branch circuit first end the amplitude of the reference signal.
6. photosensitive circuit as claimed in claim 5, it is characterised in that: first branch circuit includes an at least photoreceptor
Part, the sensor devices include first electrode, the reference signal transmitted for receiving the switch unit.
7. photosensitive circuit as claimed in claim 6, it is characterised in that: the sensor devices are photodiode, and the light
The cathode of electric diode is the first electrode of the sensor devices, the reference letter transmitted for receiving the switch unit
Number, the anode of the photodiode receives a fixed telecommunication number.
8. photosensitive circuit as claimed in claim 6, it is characterised in that: first branch circuit further comprises the first electricity
Holding, the first pole plate of the first capacitor is for receiving the reference signal that the switch unit transmits, and described first
Second pole plate of capacitor is grounded, and the first capacitor forms discharge loop with the sensor devices when executing light sensing.
9. photosensitive circuit as claimed in claim 8, it is characterised in that: the first capacitor is variable capacitance or described the
One capacitor is the capacitor array being made of multiple capacitors.
10. photosensitive circuit as claimed in claim 5, it is characterised in that: second branch circuit includes one second capacitor, institute
The first pole plate for stating the second capacitor connects the switch unit, and the second pole plate of second capacitor receives a fixed telecommunication number.
11. photosensitive circuit as claimed in claim 5, it is characterised in that: the switch unit includes the first transistor and second
Transistor, and the first transistor includes the first coordination electrode, the first transmission electrode and the second transmission electrode, the second crystal
Pipe includes the second coordination electrode, third transmission electrode, the 4th transmission electrode；First coordination electrode and the second coordination electrode are equal
For receiving first scanning drive signal, first transmission electrode and third transmission electrode are used to receive the reference
Signal, second transmission electrode are connect with the first end of first branch circuit, the 4th transmission electrode and described the
The first end of two branch circuit connects.
12. the photosensitive circuit as described in any one of claim 5-11, it is characterised in that: the signal output unit is into one
Step controls signal and a constant current signal for receiving an output, and when receiving the output control signal, by institute
It states constant current signal and is converted to two different current signals, and export.
13. photosensitive circuit as claimed in claim 12, it is characterised in that: the signal output unit include third transistor and
Conversion circuit；The third transistor includes third coordination electrode, the 5th transmission electrode and the 6th transmission electrode, the third control
Electrode processed is for receiving the output control signal, and the 5th transmission electrode is for receiving the constant electric signal, the 6th transmission electricity
Pole is connect with the conversion circuit；The conversion circuit is used for electric signal and the institute of the first end according to first branch circuit
The constant current signal is converted to two different current signals by the electric signal for stating the first end of the second branch circuit, and defeated
Out.
14. photosensitive circuit as claimed in claim 13, it is characterised in that: the conversion circuit includes differential pair tube, and described
The sum of two different current signal amplitudes are equal to the amplitude of the constant current signal.
15. photosensitive circuit as claimed in claim 13, it is characterised in that: the conversion circuit includes the 4th transistor and the 5th
Transistor, and the 4th transistor includes the 4th coordination electrode, the 7th transmission electrode and the 8th transmission electrode, the 5th transistor
Including the 5th coordination electrode, the 9th transmission electrode, the tenth transmission electrode；4th coordination electrode of the 4th transistor with it is described
The first end of first branch circuit connects, and the 7th transmission electrode is connect with the 6th transmission electrode of the third transistor, and the 8th
Transmission electrode is for exporting a current signal；The of 5th coordination electrode of the 5th transistor and second branch circuit
One end connection, the 9th transmission electrode are connect with the 6th transmission electrode of the third transistor, and the tenth transmission electrode is used for
Export another current signal.
16. photosensitive circuit as claimed in claim 8, it is characterised in that: the switch unit further comprises the 6th transistor,
6th transistor includes the 6th coordination electrode, the 11st transmission electrode, the 12nd transmission electrode, and the 6th coordination electrode is used
In receiving one second scanning drive signal, the 11st transmission electrode is connect with the first pole plate of the first capacitor, described
12nd transmission electrode is connect with the first electrode of the sensor devices, and the first pole plate and the signal of the first capacitor are defeated
Unit connects out.
17. photosensitive circuit as claimed in claim 16, it is characterised in that: the switch unit includes the first transistor and second
Transistor, and the first transistor includes the first coordination electrode, the first transmission electrode and the second transmission electrode, the second crystal
Pipe includes the second coordination electrode, third transmission electrode, the 4th transmission electrode；First coordination electrode and the second coordination electrode are equal
For receiving first scanning drive signal, first transmission electrode and third transmission electrode are used to receive the reference
Signal, second transmission electrode are connect with the first pole plate of first capacitor in first branch circuit, the 4th transmission
Electrode is connect with the first end of second branch circuit.
18. photosensitive circuit as claimed in claim 16, it is characterised in that: the first capacitor is used in the photosensitive unit knot
When beam light sensing, the photoreceptor signal generated when executing light sensing to the photosensitive unit is latched.
19. a kind of photosensitive device, it is characterised in that: including multiple photosensitive electricity as described in any one of claim 1-18
Road.
20. photosensitive device as claimed in claim 19, it is characterised in that: the photosensitive device further comprise respectively with it is described
The photosensitive driving unit and signal processing unit that multiple photosensitive circuits are electrically connected；The photosensitive driving unit is for driving institute
The electric signal generated when stating photosensitive circuit and execute light sensing, and executing light sensing according to the photosensitive circuit, by a scheduled perseverance
Determine electric signal and be converted to two different electric signals, and exports；The signal processing unit is used for the multiple photosensitive circuit is defeated
The different electric signal of two out is read, and according to the signal acquisition of reading in contact with or close to the object above the photosensitive device
The predetermined biological information of body.
21. photosensitive device as claimed in claim 19, it is characterised in that: the photosensitive device is a sensitive chip.
22. photosensitive device as claimed in claim 19, it is characterised in that: the photosensitive device is for sensing finger print information.
23. a kind of electronic equipment, it is characterised in that: including the photosensitive device as described in any one of claim 19-22.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/120406 WO2019127578A1 (en) | 2017-12-30 | 2017-12-30 | Photosensitive circuit, photosensitive apparatus, and electronic device |
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| Publication Number | Publication Date |
|---|---|
| CN209044629U true CN209044629U (en) | 2019-06-28 |
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| CN201790000326.1U Active CN209044629U (en) | 2017-12-30 | 2017-12-30 | Photosensitive circuit, photosensitive device and electronic equipment |
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| CN (1) | CN209044629U (en) |
| WO (1) | WO2019127578A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1235172C (en) * | 2002-02-20 | 2006-01-04 | 佳能株式会社 | Image input device |
| US7623689B2 (en) * | 2003-11-18 | 2009-11-24 | Canon Kabushiki Kaisha | Image pick-up apparatus including luminance control of irradiation devices arranged in a main scan direction |
| KR101376228B1 (en) * | 2013-07-17 | 2014-04-01 | 실리콘 디스플레이 (주) | Fingerprint sensor capable of sensing fingerprint by optical method and capacitive method |
| CN105336752B (en) * | 2014-06-23 | 2018-08-21 | 上海箩箕技术有限公司 | Area array sensor device and forming method thereof |
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