CN209055953U - Photosensitive driving circuit and photosensitive device, electronic equipment - Google Patents
Photosensitive driving circuit and photosensitive device, electronic equipment Download PDFInfo
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- CN209055953U CN209055953U CN201790000319.1U CN201790000319U CN209055953U CN 209055953 U CN209055953 U CN 209055953U CN 201790000319 U CN201790000319 U CN 201790000319U CN 209055953 U CN209055953 U CN 209055953U
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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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- Transforming Light Signals Into Electric Signals (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
A kind of photosensitive driving circuit, photosensitive device (20) and electronic equipment, photosensitive driving circuit is for successively driving multiple photosensitive pixels (22) to execute light sensing；After photosensitive pixel (22) starts to execute light sensing, control photosensitive pixel (22) executes the electric signal output generated when light sensing.Photosensitive device (20) includes multiple photosensitive pixels (22) and above-mentioned photosensitive driving circuit, and electronic equipment includes the photosensitive device (20).
Description
Technical field
The photosensitive driving circuit and photosensitive device, electronics that the utility model relates to a kind of for sensing biological information are set
It is standby.
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 driving circuit, photosensitive device and electronic equipment with novel embodiment.
A kind of photosensitive driving circuit of the utility model embodiment, for successively driving the multiple photosensitive pixel to execute
Light sensing；After the photosensitive pixel starts to execute light sensing, controls the photosensitive pixel and execute the electric signal generated when light sensing
Output.
The light sensing method of the utility model embodiment not only can control the photosensitive pixel light sensing time, but also
It is exported in time, effectively by the electric signal that output control signal realizes photosensitive unit generation, to improve sensing precision.
In addition, the output of the photoreceptor signal of photosensitive pixel is controlled by output control signal, so that the signal of photosensitive pixel and output end
Isolation, the photoreceptor signal for avoiding other circuit loads from influencing photosensitive pixel further mention to obtain accurate photoreceptor signal
High sensing precision.
In some embodiments, the multiple photosensitive pixel in array distribution in a substrate, and in the substrate also
Equipped with a plurality of the first scan line being electrically connected respectively with the multiple photosensitive pixel；The photosensitive driving circuit includes:
First driving circuit, it is corresponding to be electrically connected with first scan line, for line by line or interlacing provides one first and sweeps
Driving signal is retouched to the multiple photosensitive pixel, to drive the multiple photosensitive pixel line by line or interlacing execution light sensing.
In some embodiments, first driving circuit is further used for:
First scanning drive signal is being provided to the photosensitive pixel of current line, and the output is provided and controls signal
To the photosensitive pixel of the current line, to drive the photosensitive pixel of the current line to execute light sensing, and controls and produced when executing light sensing
After raw electric signal output, then first scanning drive signal is provided to the photosensitive pixel of next line.
When photosensitive device in the utility model embodiment executes light sensing, light sensation is executed in the photosensitive pixel of current line
The photosensitive pixel that the photoreceptor signal generated when surveying, and executing light sensing was read and then carried out next line executes light sensing, such as
This does not interfere with each other the reading of the photoreceptor signal of every a line photosensitive pixel, it is hereby achieved that accurate photoreceptor signal.In addition,
Since the time that photosensitive device executes light sensing needs is longer, so can be used as test pattern use.
In some embodiments, first driving circuit is further used for:
When providing first scanning drive signal to the photosensitive pixel of current line and reaching a predetermined time, institute is provided
The first scanning drive signal is stated to the photosensitive pixel of next line；The predetermined time is an at least clock cycle.
The utility model embodiment rolls photosensitive mode by photosensitive device, so that the photosensitive device executes primary light
The time of sensing is shorter, and the time of the photoreceptor signal to be read such as all photosensitive pixels is also consistent, that is, solves charge and let out
Leakage is influenced on caused by photoreceptor signal acquisition, to improve sensing precision.
In some embodiments, a plurality of second be electrically connected with the multiple photosensitive pixel is additionally provided in the substrate
Scan line；The photosensitive driving circuit further comprises: the second driving circuit, and second driving circuit correspondence is swept with described second
Line electric connection is retouched, for providing described defeated when each photosensitive pixel starts to execute light sensing and reached for four predetermined times
Control signal gives the photosensitive pixel out, to control the electric signal output generated when the photosensitive pixel executes light sensing.
In some embodiments, second driving circuit is further used for: controlling the photosensitive pixel and executes light sensation
The electric signal generated when survey exports and continued for the second predetermined time.
In some embodiments, second predetermined time carries out dynamic tune according to the intensity of the optical signal received
It is whole.
In some embodiments, the intensity of the optical signal received is bigger, and the second predetermined time is shorter；It is described to connect
The intensity of the optical signal received is smaller, and the second predetermined time is longer.
When the utility model embodiment is read according to the electric signal that the intensity of optical signal adjusts photosensitive pixel generation in time
Between, it ensure that the accurate reading of electric signal, to improve sensing precision.
In some embodiments, the data line being electrically connected with the multiple photosensitive pixel is additionally provided in the substrate；
The photosensitive driving circuit further comprises signal processing unit, and the signal processing unit electrically connects with the multiple data lines
It connects, the electric signal for exporting to the photosensitive pixel is read out, and is obtained according to the electric signal of reading in contact with or close to institute
State the predetermined biological information of the target object of photosensitive pixel.
In some embodiments, the photosensitive driving circuit is formed on the substrate or is electrically connected part by one
It is electrically connected with the multiple photosensitive pixel；Alternatively, a part of circuit of the photosensitive driving circuit is formed on the substrate,
Another part circuit is electrically connected by a connection piece and the multiple photosensitive pixel.
A kind of photosensitive device that the utility model embodiment provides, including multiple photosensitive pixels and above-mentioned any one reality
The photosensitive driving circuit of mode is applied, which is used to that the multiple photosensitive pixel to be driven to execute light sensing, and in institute
It states photosensitive pixel to start after executing light sensing, controls the photosensitive pixel and execute the electric signal output generated when light sensing.
In some embodiments, the photosensitive device is fingerprint acquisition apparatus, for acquiring the finger print information of finger.
In some embodiments, the photosensitive device is a biology sensing chip, for obtaining near to or in contact with described
The predetermined biological information of the target object of photosensitive device.
The a kind of electronic equipment that the utility model embodiment provides, the photoreceptor cartridge including above-mentioned any one embodiment
It sets.
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 signal timing diagram for the embodiment that photosensitive device shown in Fig. 4 executes light sensing；
Fig. 7 is the signal timing diagram for another embodiment that photosensitive device shown in Fig. 4 executes light sensing；
Fig. 8 is the electrical block diagram of another embodiment of photosensitive pixel shown in FIG. 1；
Fig. 9 is signal timing diagram of the photosensitive pixel shown in Fig. 8 when executing light sensing, at each node；
Figure 10 is photosensitive pixel and scan line, data line and signal in the photosensitive device of one embodiment of the utility model
Connection relationship structure between reference line, and the photosensitive pixel is the photosensitive pixel structure shown in Fig. 8；
Figure 11 is the structural block diagram of one embodiment of photosensitive driving unit shown in Fig. 10；
Figure 12 is the structural schematic diagram of photosensitive panel in the photosensitive device of one embodiment of the utility model；
Figure 13 is the flow diagram of the light sensing method of the photosensitive device of one embodiment of the utility model；
Figure 14 is the structural schematic diagram of electronic equipment applied by the photosensitive device of one embodiment of the utility model；
Figure 15 is diagrammatic cross-section of the electronic equipment shown in Figure 14 along I-I line, and Figure 15 shows the portion of electronic equipment
Separation structure；
Figure 16 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 17 is the structural schematic diagram of electronic equipment applied by the photosensitive device of one embodiment of the utility model；
Figure 18 is diagrammatic cross-section of the electronic equipment shown in Figure 17 along II-II line, and Figure 18 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 sensing unit receives optical signal, and the optical signal received is converted to corresponding photoreceptor signal, i.e. electric signal；
The signal output unit controls signal for receiving output, and when receiving the output control signal, by the sensing
Unit executes the photoreceptor signal output generated when light sensing.
Specifically, referring to Fig. 2, Fig. 2 shows a kind of circuit structures of a photosensitive pixel 22 in Fig. 1.Therefore, this is photosensitive
Pixel 22 is alternatively 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 and one first output end Out1.It includes the first turntable driving that light sensing, which controls signal,
Signal.Photosensitive pixel 22 includes sensing unit and signal output unit 223, and sensing unit includes switch unit 221 and photosensitive again
Unit 222, photosensitive unit 222 are connected between switch unit 221 and signal output unit 223.Switch unit 221 passes through third
Input terminal In3 receives a reference signal Vref, in addition, switch unit 221 also receives one first scanning by first input end In1
Driving signal, and reference signal Vref is transmitted to photosensitive unit 222 when receiving the first scanning drive signal, to drive sense
Light unit 222 works.Photosensitive unit 222 turns the optical signal received for receiving optical signal, and when receiving optical signal
It is changed to corresponding electric signal.Signal output unit 223 receives output control signal by the second input terminal In2, and according to output
The electric signal that control signal generates photosensitive unit 222 is exported from the first output end Out1.
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 was the first predetermined time in dynamic signal, and the duration of high level is second pre- in output control signal
It fixes time.
In some embodiments, photosensitive unit 222 include a sensor devices, the sensor devices include a first electrode and
Second electrode, first electrode is for receiving the reference signal Vref that switch unit 221 transmits, and second electrode is for receiving one
Fixed telecommunication number.It is applied to two electrodes of sensor devices by reference to signal Vref and fixed telecommunication number, forms driving photoreceptor
The driving voltage of part.The sensor devices are such as, but not limited to photodiode D1, change 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.
Deng.By taking photodiode D1 as an example, photodiode D1 includes anode and cathode, wherein anode receives a predetermined electrical signals,
Such as ground signalling NGND；First electrode of the cathode as sensor devices, the reference transmitted for receiving switch unit 221
Signal Vref.It should be noted that as long as reference signal Vref is corresponding with the prearranged signals to be applied to the two of photodiode D1
When end, the both ends photodiode D1 can be made to form backward voltage, so that photodiode D1 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 Vg on the cathode of photodiode D1 is gradually increasing and pre- first
It fixes time when reaching, voltage Vg reaches the voltage value of reference signal Vref and remains unchanged.At this point, the both ends photodiode D1
Voltage difference is up to the backward voltage of driving photodiode work, i.e. photodiode D1 is in running order.Due to first
Scanning drive signal switchs to low level signal when reaching the first predetermined time, by high level signal, and switch unit 221 is according to low
Level signal disconnects, then discharge loop is formed inside photodiode D1.At this point, if thering is optical signal to be irradiated to the photodiode
The reverse current of D1, photodiode D1 increase rapidly, so that the voltage Vg on the negative pole node of photodiode D1 is sent out therewith
Changing is 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 Vg on the negative pole node of photodiode D1 is faster.
Further, photosensitive unit 222 further includes first capacitor c1.When first capacitor c1 is used to execute light sensing, with
Sensor devices form discharge loop, to obtain corresponding photoreceptor signal.Specifically, as shown in Fig. 2, first capacitor c1 with it is photosensitive
Device is arranged in parallel, i.e. the first pole plate of first capacitor c1 is connect with the cathode of photodiode D1, and the second of first capacitor c1
Pole plate meets a predetermined electrical signals, such as earth signal NGND.When reference signal Vref is transmitted to the cathode of photodiode D1,
It charges to first capacitor c1, and when switch unit 221 disconnects, first capacitor c1 and photodiode D1 formation are discharged back
Road, and the voltage (i.e. voltage Vg) of the first pole plate of first capacitor c1 is also gradually reduced.By the way that first capacitor c1 is arranged, increase
The capacitance of photosensitive unit 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.
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, switch unit 221 includes a first transistor T1, and the first transistor T1 is for example but not
Be 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
First coordination electrode C1, the first transmission electrode S1 and the second transmission electrode S2, wherein the first coordination electrode is the grid of metal-oxide-semiconductor,
First transmission electrode S1 is the drain electrode of metal-oxide-semiconductor, and the second transmission electrode S2 is the source electrode of metal-oxide-semiconductor.First coordination electrode C1 and first
Input terminal In1 connection, for receiving the first scanning drive signal；First transmission electrode S1 is connect with third input terminal In3, is used for
Receive reference signal Vref；Second transmission electrode S2 is connect with the cathode of photodiode D1 in photosensitive unit 222.When passing through the
When one input terminal In1 inputs the first scanning drive signal, the first transistor T1 is connected according to the first scanning drive signal, with reference to letter
Number Vref is loaded into the cathode and first capacitor c1 of photodiode D1 through the first transmission electrode S1, the second transmission electrode S2
First pole plate；The first transistor T1 is connected and ends after continuing for the first predetermined time, first capacitor c1 and photodiode D1 shape
At discharge loop, start to execute light sensing.
In some embodiments, signal output unit 223 includes a second transistor T2 and buffer circuit.Buffer circuit
Electric signal for generating photosensitive unit 222 buffers.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, second transistor T2 includes the second coordination electrode C2, third
Transmission electrode S3 and the 4th transmission electrode S4, wherein the second coordination electrode C2 is the grid of metal-oxide-semiconductor, third transmission electrode S3 is
The drain electrode of metal-oxide-semiconductor, the 4th transmission electrode S4 are the source electrode of metal-oxide-semiconductor.Second coordination electrode C2 is connect with the second input terminal In2, is used
Control signal is exported in receiving；The third transmission electrode S3 is connect with the buffer circuit, for receiving buffer circuit output
Electric signal；4th transmission electrode S4 is connect with the first output end Out1, for by by the buffer circuit buffering after electricity
Signal output.
Further, buffer circuit is connected between photosensitive unit 222 and second transistor T2, is used for the photosensitive list
Electric signal after 222 conversion of member is buffered, and in second transistor T2 conducting, exports the electric signal of buffering.The present embodiment
In, which includes a third transistor T3, and it is brilliant that third transistor T3 is such as, but not limited to triode, metal-oxide-semiconductor, film
In body pipe 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, the 6th transmission electrode S6, wherein third coordination electrode C3 is the grid of metal-oxide-semiconductor, and the 5th transmission electrode S5 is metal-oxide-semiconductor
Drain electrode, the 6th transmission electrode S6 are the source electrode of metal-oxide-semiconductor.Third coordination electrode C3 is connect with the cathode of photodiode D1, is used for
It receives photodiode D1 and executes the electric signal generated when light sensing；5th transmission electrode S5 is for receiving a voltage signal Vcc；
6th transmission electrode S6 is connect with the third transmission electrode S3 of second transistor T2, for exporting in second transistor T2 conducting
The electric signal of buffering.
In above-mentioned third transistor T3, the voltage Vs of the 6th transmission electrode S6 changes with the voltage Vg of third coordination electrode C3
And change, no matter how the circuit load of i.e. the 6th transmission electrode S6 connection changes, do not affect the electricity of the 6th transmission electrode S6
Pressure.Moreover, because transistor characteristic, a low threshold voltage, the threshold voltage are third crystal to voltage Vs always than voltage Vg
The threshold voltage of pipe T3.Therefore, buffer circuit plays the role of buffering isolation, generates when photosensitive unit 222 is executed light sensing
Electric signal be isolated, avoid other circuit loads from influencing the photoreceptor signal that photosensitive units 222 generate, to ensure that sense
Light pixel 22 accurately executes light sensing, improves photosensitive device 20 to the sensing precision of target object.
Referring to figure 3., Fig. 3 shows the signal sequence when execution of photosensitive pixel 22 light sensing shown in Fig. 2 at each node,
Wherein Vg is the voltage on photodiode D1 cathode, is also the voltage on the third coordination electrode C3 of third transistor T3；Vs
For the voltage on the 6th transmission electrode S6 of third transistor T3.
The t1 moment inputs the first scanning drive signal by first input end In1, so that the first transistor T1 is connected and holds
Continuous first predetermined time (i.e. t2-t1) ends afterwards, and within first predetermined time, reference signal Vref is through the first transmission electrode S1
The cathode of photodiode D1 and the first pole plate of first capacitor c1 are transmitted to the second transmission electrode S2.Due to two pole of photoelectricity
There is an equivalent capacity, therefore reference signal Verf charges to the equivalent capacity inside photodiode D1 inside pipe D1,
So that the voltage Vg on the cathode of photodiode D1 is gradually increasing and protects after the voltage value for reaching reference signal Vref
It holds constant.In addition, since first capacitor c1 is in parallel with photodiode D1, reference signal Vref also to first capacitor c1 into
Row charging, so that the voltage on the first pole plate is gradually increasing and keeps not after the voltage value for reaching reference signal Vref
Become.
T2 moment, the first scanning drive signal become low level signal from high level, i.e. first input end In1 becomes low electricity
Ordinary mail number, the first transistor T1 cut-off, forms discharge loop between equivalent capacity and first capacitor c1 and photodiode D1.If
There is optical signal irradiation on photodiode D1, then generates the current signal directly proportional to optical signal inside photodiode D1, because
Voltage Vg on this photodiode D1 cathode is gradually decreased.Moreover, optical signal is stronger, the speed that voltage Vg is reduced is faster.Separately
Outside, due to the voltage follow characteristic of third transistor T3, the voltage Vs on the 6th transmission electrode S6 of third transistor T3 is with light
Voltage Vg on electric diode D1 cathode changes and changes, and voltage Vs Vth lower than voltage Vg always, the Vth are that third is brilliant
The threshold voltage of body pipe T3.It should be noted that first predetermined time with guarantee in photosensitive unit 22 photodiode and
First capacitor c1 charges to reference signal Vref.
T3 moment, that is, photosensitive unit 222 start after executing light sensing and reaching for the 4th predetermined time (i.e. t3-t2),
By the second input terminal In2 input/output control signal, second transistor T2 is connected according to high level signal, at this time third crystal
Third transmission electrode S3 and fourth transmission electrode S4 of the voltage Vs through second transistor T2 on the 6th transmission electrode S6 of pipe T3,
It is exported from the first output end Out1.The voltage of first output end Out1 output first gradually rises up to the 6th transmission electricity from low level
Voltage Vs on the S6 of pole, followed by the voltage Vs on the 6th transmission electrode S6 variation and change.It should be noted that this
Four predetermined times were at least one clock cycle, and the 4th predetermined time cannot be too long, certainly can not be too short, to guarantee to feel
Light unit 222 executes the photoreceptor signal generated when light sensing and can effectively and in time export.
T4 moment, output control signal become low level signal from high level signal, i.e. the second input terminal In2 becomes low electricity
The voltage of ordinary mail number, second transistor T2 cut-off, the first output end Out1 output is gradually reduced or remains unchanged.Under guaranteeing
Effective output of secondary signal, the first output end Out1 output voltage need to gradually decrease down low level.When the above-mentioned t4 moment is with t3
This period between quarter, that is, the voltage Vs in the second predetermined time Δ t1, on the 6th transmission electrode S6 of third transistor T3
(that is, voltage Vg on photodiode D1 cathode) will be exported from the first output end Out1, therefore defeated by reading first
The voltage signal of outlet Out1 can be obtained the size for the photoreceptor signal that photodiode D1 is generated because receiving optical signal,
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 decrease speed of voltage Vg is faster, so that the decrease speed of voltage Vs is also faster, therefore,
For the accurately and effectively acquisition for realizing photoreceptor signal, the size of Δ t1 is adjusted according to the intensity of the optical signal received.Specifically,
Light signal strength is bigger, then the second predetermined time Δ t1 is shorter；Light signal strength is smaller, then the second predetermined time Δ t1 is longer.
In some embodiments, photosensitive pixel 22 and each scan line, number in photosensitive device 20 are shown referring to Fig. 4, Fig. 4
According to the connection structure of line and signal reference line, and the photosensitive pixel be Fig. 2 shows circuit structure.The photosensitive device 20 into one
Step includes the scanline groups being electrically connected with multiple photosensitive pixels 22, data line group, signal reference line group.Wherein, scanline groups
Including by a plurality of first scanline groups at the first scanline groups and by a plurality of second scanline groups at the second scanline groups, number
It include multiple data lines according to line group, signal reference line group includes a plurality of signal reference line.By taking the photosensitive array 201 in Fig. 1 as an example,
In photosensitive array 201, X-direction lastrow photosensitive pixel includes spaced n photosensitive pixel 22, the column sense in Y-direction
Light pixel includes spaced m photosensitive pixel 22, therefore the photosensitive array 201 includes m*n photosensitive pixel 22 altogether.It is right
Ying Di, the 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 further 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；Signal reference line group includes m bars reference line, and the m bars reference line is along Y-direction interval
Arrangement, 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
S1,S2,…Sn-1,Sn.Certainly, the scanline groups, data line group of photosensitive device 20 and signal reference line group may be other
Regular fashion distribution or non-regular distribution.In addition, due to the first scan line, the second scan line, signal reference line and data
Line is conductive, therefore leads between the first scan line, the second scan line, signal reference line and the data line being in the crossed position
Insulating materials is crossed to be 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, n data line correspondence is connect with the first output end Out1 of multiple photosensitive pixels 22.Wherein, it is
Wiring is convenient, and the first scan line, the second scan line, signal reference line are drawn from X-direction, and data line draws from Y-direction
Out.
In some embodiments, photosensitive device 20 further comprises photosensitive driving circuit, which is used for
The multiple photosensitive pixel 22 is successively driven to execute light sensing；After the photosensitive pixel 22 starts to execute light sensing, control should
Photosensitive pixel 22 executes the electric signal output generated when light sensing.
Further, please continue to refer to Fig. 4, which includes a photosensitive driving unit 24, photosensitive device 20
In the first scan line, the second scan line, signal reference line be connected to the photosensitive driving unit 24.Referring to figure 5., Fig. 5 shows
The structure of photosensitive 24 1 embodiment of driving unit in Fig. 4 is gone out.The photosensitive driving unit 24 includes providing the first turntable driving
The ginseng of first driving circuit 241 of signal, the second driving circuit 242 that output control signal is provided and offer reference signal Vref
Examine circuit 243.Each circuit of the photosensitive driving unit 24 can be integrated in a control chip by silicon technology, this is photosensitive certainly
Each circuit of driving unit 24 can also be formed separately from different control chips.For example, the first driving circuit 241 and second
Driving circuit 242 and photosensitive pixel 22 are formed together on the same substrate, and reference circuit 243 is then by a connection piece (for example, soft
Property circuit board) it is connect with a plurality of signal reference line on 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
Photosensitive unit 222 is electrically connected.In first switch closure, the first switch that reference signal Vref then passes through closure is transferred to
Corresponding photosensitive unit 222.
First scan line of the first driving circuit 241 and photosensitive device 20 is electrically connected, for line by line or interlacing provides the
One scanning drive signal to control first switch closure, and is arrived to the first switch in photosensitive pixel 22 in the first predetermined time
Up to when, control first switch disconnect, thus drive photosensitive unit 222 start execute light sensing.
Second scan line of the second driving circuit 242 and photosensitive device 20 is electrically connected, for opening in each photosensitive pixel
When beginning to execute light sensing and reached for four predetermined times, i.e., first switch disconnects and reached for the 4th predetermined time (for example, Fig. 3 institute
The t3-t2 shown) when, it provides and exports control signal to the second switch in photosensitive pixel 22 (for example, signal shown in Fig. 2 exports
Second transistor T2 in unit 223), control second switch closure, so that photosensitive unit 222 executes the electricity generated when light sensing
Signal output.
Further, in some embodiments, the first driving circuit 241 is further used for: sweeping providing described first
Driving signal is retouched to the photosensitive pixel of current line, and described export is provided and controls signal to the photosensitive pixel of the current line, with
It drives the photosensitive pixel of the current line to execute light sensing, and controls the photosensitive pixel and execute the electric signal output generated when light sensing
Afterwards, then first scanning drive signal is provided to the photosensitive pixel of next line.Need to illustrate when, the sense of next line here
Light pixel is not limited to a line photosensitive pixel adjacent with the photosensitive pixel of current line, can also refer to the photosensitive pixel of interlacing.
Specifically, timing when photosensitive device shown in Fig. 4 executes light sensing, the photoreceptor cartridge are shown referring to Fig. 6, Fig. 6
Set that use is photosensitive line by line, the mode read line by line executes light sensing.t1Moment provides the first scanning drive signal to the 1st row
Photosensitive pixel, to drive the 1st row photosensitive pixel to execute light sensing, t2Moment provides and exports control signal to the light-sensitive image of the 1st row
Element exports photoreceptor signal to control the photosensitive pixel of the 1st row；t3Moment provides the first scanning drive signal to the photosensitive of the 2nd row
Pixel, to drive the 2nd row photosensitive pixel to execute light sensing, t4Moment, provide export control signal to the 2nd row photosensitive pixel,
With the photosensitive pixel output photoreceptor signal ... and so on for controlling the 2nd row, t2m-1, the first scanning drive signal is provided to m row
Photosensitive pixel, with drive m row photosensitive pixel execute light sensing, t2mMoment provides and exports control signal to the photosensitive of m row
Pixel exports photoreceptor signal to control the photosensitive pixel of m row.
When photosensitive device in the utility model embodiment executes light sensing, light sensation is executed in the photosensitive pixel of current line
The photosensitive pixel that the photoreceptor signal generated when surveying, and executing light sensing was read and then carried out next line executes light sensing, such as
This does not interfere with each other the reading of the photoreceptor signal of every a line photosensitive pixel, it is hereby achieved that accurate photoreceptor signal.In addition,
Since the time that photosensitive device executes light sensing needs is longer, so can be used as test pattern use.
Further, in some embodiments, the first driving circuit 241 is further used for: scanning and drives in offer first
Signal is moved to the photosensitive pixel of current line and when reaching a predetermined time, provides first scanning drive signal to next line
Photosensitive pixel；The predetermined time is an at least clock cycle.
Specifically, due in photosensitive pixel 22 photoreceptor signal by output control signal control exported, no
The light sensing time of the photosensitive pixel of colleague can be overlapped, i.e., when the photosensitive pixel of current line executes light sensing, can provide the
One scanning drive signal to next line photosensitive pixel, with drive the photosensitive pixel execute light sensing.Need to illustrate when, here
The photosensitive pixel of next line be not limited to a line photosensitive pixel adjacent with the photosensitive pixel of current line, can also refer to the sense of interlacing
Light pixel.
Timing when photosensitive device shown in Fig. 4 executes light sensing is shown referring to Fig. 7, Fig. 7, the photosensitive device is using rolling
Dynamic light, the mode read line by line execute light sensing.t11At the moment, provide the first scanning drive signal to the photosensitive pixel of the 1st row,
To drive the 1st row photosensitive pixel to execute light sensing, t12At the moment, provide the first scanning drive signal to the photosensitive pixel of the 2nd row, with
The 2nd row photosensitive pixel is driven to execute light sensing, t13Moment provides the first scanning drive signal to the photosensitive pixel of the 3rd row, to drive
Dynamic 3rd row photosensitive pixel executes light sensing, and so on, t1mMoment provides the first scanning drive signal to the light-sensitive image of m row
Element, to drive m row photosensitive pixel to execute light sensing.Light sensing is executed in the photosensitive pixel of every a line and reaches the predetermined time
When, it provides and exports control signal to the photosensitive pixel of the row.Such as, t21Moment, which provides, exports control signal to the light-sensitive image of the 1st row
Element, to control the photoreceptor signal output of the 1st row photosensitive pixel, t22Moment provide export control signal to the 2nd row photosensitive pixel,
To control the photoreceptor signal output of the 2nd row photosensitive pixel.
It is waited it follows that the photosensitive device 20 is executed with the time of this light sensing shorter and all photosensitive pixel
The time for reading photoreceptor signal is also consistent, that is, solves charge leakage on influence caused by photoreceptor signal acquisition, to improve
Sense precision.
In some embodiments, please continue to refer to Fig. 4, which further comprises signal processing unit
25, the data line in photosensitive device 20 shown in Fig. 4 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, which is used to generate when executing light sensing to the photosensitive unit 222
Electric signal is read out, and obtains the predetermined life in contact with or close to the target object of the photosensitive panel according to the electric signal of reading
Object characteristic information.It is understood that in order to collect accurately and effectively electric signal, within second scheduled time, at the signal
The electric signal that reason unit 25 generates when can execute light sensing to photosensitive unit 222 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.
Fig. 8 is please referred to, Fig. 8 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 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 223 ' of sensing unit and signal output unit.Sensing unit specifically includes switch unit
221 ', 222 ' of photosensitive unit.Wherein, 221 ' of switch unit receives a reference signal Vref by third input terminal In3 ', in addition,
221 ' of switch unit also passes through first input end In1 ' and receives one first scanning drive signal, and is receiving the first turntable driving
When signal, reference signal Vref is transmitted to 222 ' of photosensitive unit, to drive 222 ' of photosensitive unit to execute light sensing, signal output
223 ' of unit passes through the second input terminal In2 ' and receives an output control signal, and constant by the 4th input terminal In4 reception one
Electric signal Is, with when receiving output control signal, the electric signal generated when executing light sensing according to 222 ' of photosensitive unit will
Constant electric signal Is is converted to two different electric signals, and exports from the first output end Out1 ' and second output terminal Out2.
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 221 ' of switch unit receives the first scanning drive signal, is closed according to high level signal, root
It is disconnected according to low level signal.Therefore, the reference signal Vref that 222 ' of photosensitive unit reception, 221 ' of switch unit is transmitted, and
When first predetermined time reached, start to execute light sensing.
In some embodiments, 222 ' of photosensitive unit includes the first branch circuit 2221 and the second branch circuit 2222.
Wherein, 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 the electric signal of the first end of the second branch circuit 2222 maintaining the reference
The amplitude of signal Vref.Specifically, 222 ' of the photosensitive unit is similar with the structure of photosensitive unit 222 shown in Fig. 2, the photosensitive list
222 ' are other than the structure of photosensitive unit 222 shown in Fig. 2 for member, further include one second capacitor c2, and sensor devices and the first electricity
Hold the first branch circuit 2221 that c1 is 222 ' of photosensitive unit, the second capacitor c2 is the second branch circuit of 222 ' of photosensitive unit
2222。
About the first branch circuit 2221, the cathode of photodiode D1 and the first pole plate of first capacitor c1 are defined here
For the first end of the first branch circuit 2221, the anode of photodiode D1 is the first branch with the second pole plate of first capacitor c1
The second end of circuit 2221.The working principle of first branch circuit 2221 please refers to previously mentioned implementation.Second branch circuit
In 2222, the first pole plate is for receiving the reference signal Vref that 221 ' of switch unit is transmitted, the second pole in the second capacitor c2
Plate is for receiving a fixed telecommunication number, such as earth signal NGND.Reference signal Vref charges to the second capacitor c2, to make
The voltage Vn obtained on the first pole plate of the second capacitor c2 is gradually increasing and remains unchanged after the amplitude for reaching reference signal Vref.
It should be noted that the first pole plate for defining the second capacitor c2 here is the first end of the second branch circuit 2222, the second capacitor
The second pole plate of c2 is the second end of the second branch circuit 2222.
Further, in some embodiments, switch unit 221 includes the 4th transistor T4 and the 5th transistor T5.
4th transistor T4 and the 5th transistor T5 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 4th transistor T4 includes the 4th coordination electrode C4, the 7th transmission electrode S7 and the 8th transmission electricity
Pole S8, wherein the 4th coordination electrode C4 is the grid of metal-oxide-semiconductor, the 7th transmission electrode S7 is the drain electrode of metal-oxide-semiconductor, the 8th transmission electrode
S8 is the source electrode of metal-oxide-semiconductor.5th transistor T5 includes the 5th coordination electrode C5, the 9th transmission electrode S9, the tenth transmission electrode
S10, wherein the 5th coordination electrode C5 is the grid of metal-oxide-semiconductor, the 9th transmission electrode S9 is the drain electrode of metal-oxide-semiconductor, the tenth transmission electrode
S10 is the source electrode of metal-oxide-semiconductor.
4th coordination electrode C4 and the 5th coordination electrode C5 are connect with first input end In1 ', for receiving the first scanning
Driving signal；7th transmission electrode S7 and the 9th transmission electrode S9 is connect with third input terminal In3 ', for receiving with reference to letter
Number Vref；8th transmission electrode S8 is connect with the first end of the first branch circuit 2221 of 222 ' of photosensitive unit, for the 4th
When transistor T4 is connected, reference signal Vref is transmitted to the first branch circuit 2221 of 222 ' of photosensitive unit；Tenth transmission electricity
Pole S10 is connect with the first end of the second branch circuit 2222 of 222 ' of photosensitive unit, is used in the 5th transistor T5 conducting, will
Reference signal Vref is transmitted to the second branch circuit 2222 of 222 ' of photosensitive unit.
In some embodiments, 223 ' of signal output unit in present embodiment includes the 6th transistor T6 and conversion
Circuit 2231.6th transistor T6 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 6th transistor T6 includes the 6th coordination 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, the 11st transmission electrode S11 is the drain electrode of metal-oxide-semiconductor, the 12nd transmission
Electrode S12 is the source electrode of metal-oxide-semiconductor.6th coordination electrode C6 is connect with the second input terminal In2 ', for receiving output control signal；
11st transmission electrode S11 is connect with the 4th input terminal In4, for receiving a constant current signal Is, the 12nd transmission electrode
S12 is connect with the conversion circuit 2231.The 6th transistor T6 controls signal conduction according to output, and constant current is believed
Number Is is transmitted to the 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 a, wherein input terminal is connect with the 12nd transmission electrode S12 of the 6th transistor T6, for receiving the 6th transistor T6 transmission
The constant current signal Is to come over；Other two input terminal is correspondingly connected with first end (the i.e. photoelectricity two of the first branch circuit 2221
The cathode of pole pipe D1 and the first pole plate of first capacitor c1) and the second branch circuit 2222 first end (i.e. the second capacitor c2's
First pole plate)；Two output ends are according to the electric signal Vp and the second branch circuit 2222 of the first end of the first branch circuit 2221
First end electric signal Vn, constant current signal Is is converted into two different current signal Ip and In, and this is two different
The sum of current signal amplitude is equal to the amplitude of constant current signal Is.
Specifically, which includes the 7th transistor T7 and the 8th transistor T8.7th transistor T7 and
8th transistor T8 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 7th crystal
Pipe T7 includes the 7th coordination electrode C7, the 13rd transmission electrode S13 and the 14th transmission electrode S14, wherein the 7th coordination electrode
C7 is the grid of metal-oxide-semiconductor, and the 13rd transmission electrode S13 is the drain electrode of metal-oxide-semiconductor, and the 14th transmission electrode S14 is the source of metal-oxide-semiconductor
Pole.8th transistor T8 includes the 8th coordination electrode C8, the 15th transmission electrode S15, the 16th transmission electrode S16, wherein the
Eight coordination electrode C8 are the grid of metal-oxide-semiconductor, and the 15th transmission electrode S15 is the drain electrode of metal-oxide-semiconductor, and the 16th transmission electrode S16 is
The source electrode of metal-oxide-semiconductor.
The 7th coordination electrode C7 of 7th transistor T7 and the first end of the first branch circuit 2221 are (such as first capacitor c1
First pole plate) connection；13rd transmission electrode S13 is connect with the 12nd transmission electrode S12 of the 6th transistor T6, for receiving
The constant current signal Is that 6th transistor T6 is transmitted；14th transmission electrode S14 is connect with the first output end Out1 ',
For exporting a current signal Ip.The 8th coordination electrode C8 of 8th transistor T8 and the first end of the second branch circuit 2222
(such as the first pole plate of the second capacitor c2) connection；The 12nd transmission electrode of 15th transmission electrode S15 and the 6th transistor T6
S12 connection, the constant current signal Is transmitted for receiving the 6th transistor T6；16th transmission electrode S16 and second
Output end Out2 connection, for exporting another current signal In.
Further, the 7th transistor T7 and the 8th transistor T8 form a differential pair tube, when the of the 7th transistor T7
When voltage Vp on seven coordination electrode C7 and the voltage Vn on the 8th coordination electrode C8 of the 8th transistor T8 are equal, the differential pair
Pipe is in equilibrium state, the 16th transmission electrode of the 14th transmission electrode S14 and the 8th transistor T8 of the 7th transistor T7
The equal current signal of S16 output amplitude.Voltage Vp and the 8th crystal on the 7th coordination electrode C7 of the 7th transistor T7
For voltage Vn on the 8th coordination electrode C8 of pipe T8 there are when pressure difference, which exports the different difference telecommunications of two amplitudes
Number.By the way that the different differential electric signal of two amplitude to be input to two input terminals of difference amplifier, it is hereby achieved that accordingly
Amplification electric signal.
Fig. 9 is please referred to, the photosensitive pixel 22 that Fig. 9 shows Fig. 8 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 14th transmission electrode S14 that Ip is the 7th transistor T7 is exported, In are the 8th transistor
The current signal of the 16th transmission electrode S16 output of T8.
The t1 moment inputs the first scanning drive signal, the 4th transistor T4 and the 5th crystal by first input end In1 '
Pipe T5 is connected according to high level signal.
When the 4th transistor T4 conducting, reference signal Vref is transmitted through the 7th transmission electrode S7 and the 8th transmission electrode S8
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 the 5th transistor T5 conducting, reference signal Vref is passed through the 9th transmission electrode S9 and the tenth transmission electrode S10
It transports on the first pole plate of the second capacitor c2, to charge to the second capacitor c2, on the second pole plate of the second capacitor c2
Voltage 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 4th transistor T4 and the 5th transistor T5 are turned off.When the 4th transistor T4 cut-off when, equivalent capacity and
Discharge loop is formed between first capacitor c1 and photodiode D1.222 ' of photosensitive unit 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 five transistor T5 end, 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, the 6th transistor T6 is according to high level signal
Conducting, constant current signal Is are transmitted to conversion circuit 2231.Conversion circuit 2231 is defeated according to the pressure difference of voltage Vp and voltage Vn
The different current signal of two amplitudes out.With the decline of voltage Vp, the pressure difference between voltage Vn and voltage Vp is increasing, from
And differential pair tube exports the different current signal of two amplitudes.As shown in figure 9, the current signal of the first output end Out1 ' output
The amplitude of Ip declines with the decline of voltage Vp, due to the characteristic of differential pair tube, the current signal of second output terminal Out2 output
The amplitude of In is gradually risen up to rise with the decline of current signal Ip after the corresponding current value of voltage Vn by low level.Moreover,
Electric signal all the way, which is compared, if the electric signal exported after the two paths of differential signals is input in difference amplifier is exaggerated one times, from
And signal is haved the function that and has amplified.
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 the 6th transistor T6 ends, and the first output end Out1 ' and second output terminal Out2 stop output electric signal,
Become 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 to pass through
Corresponding current signal is obtained from the first output end Out1 ' and second output terminal Out2, and according to the two-way current signal, i.e.,
It can get the size of photoreceptor signal that 222 ' of photosensitive unit executes light sensing and generates, and then generate the biological characteristic of target object
Information.
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, the intensity of optical signal is bigger, then Δ t1 is shorter；
The intensity of optical signal 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, 222 ' of photosensitive unit starts to execute light sensing, i.e., it will generate corresponding telecommunications
Number, the timely output of interval time too long possible photoreceptor signal, interval time, too short possibility 222 ' of photosensitive unit had not enough time to produce
Raw effective photoreceptor signal, the electric signal that can control 222 ' of photosensitive unit generation 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, 0, Figure 10 is shown in the photosensitive device of another embodiment of the utility model referring to Fig.1, light-sensitive image
Element and the connection structure between scan line, data line and signal reference line, and the photosensitive pixel is the circuit knot shown in Fig. 8
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
The second scanline groups, data line group includes 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, in X-direction
A line photosensitive pixel includes spaced n photosensitive pixel 22, and the column photosensitive pixel in Y-direction includes spaced m
A photosensitive pixel 22, therefore the photosensitive array 201 includes m*n photosensitive pixel altogether.The scan line being connect with photosensitive pixel 22
Group, data line group, the quantity of signal reference line group are correspondingly arranged.Specifically, the first scanline groups include the first scan line of m item, m
The second scan line of item, and first scan line of m item is alternatively arranged along Y-direction, such as G11, G12 ... G1m, the m item second scanning
Line is also alternatively arranged along Y-direction, such as G21, G22 ... G2m.Signal reference line group includes m bars reference line, and the m item is believed
Number reference line is alternatively arranged along Y-direction, such as L1, L2 ... Lm.Data line group includes the first data line of n item, the second data of n item
Line, n third data line, and first data line of n item is alternatively arranged in X direction, such as S11, S12 ... S1n；The n item second
Data 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, example
As S31, S32 ... S3n.Certainly, the scanline groups, data line group of photosensitive device 20 and signal reference line group may be other
Regular fashion distribution or non-regular distribution.In addition, due to the first scan line, the second scan line, signal reference line and first
Data line, the second data line, third data line all have electric conductivity, therefore pass through insulation between each route 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, m item second
Scan line correspondence is connect with the second input terminal In2 ' of multiple photosensitive pixels 22, m bars reference line correspondence and multiple light-sensitive images
The third input terminal In3 ' connection of element 22, corresponding the first output end Out1 ' with multiple photosensitive pixels 22 of the first data line of n item connect
It connects, the second data line of n item is corresponding to be connect with the second output terminal Out2 of multiple photosensitive pixels 22, third data line and photosensitive pixel
22 the 4th input terminal In4 connection.Wherein, the first scan line, the second scan line, signal reference line are drawn from X-direction, the
One 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
The multiple photosensitive pixel is successively driven to execute light sensing；After the photosensitive pixel starts to execute light sensing, it is photosensitive to control this
Pixel executes the electric signal output generated when light sensing.
In some embodiments, please continue to refer to Figure 10, 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
11, Figure 11 show the functional module of the photosensitive driving unit of one embodiment of the utility model.The photosensitive driving unit 24 wraps
Include provide the first scanning drive signal 241 ' of the first driving circuit, provide output control signal 242 ' of the second driving circuit and
243 ' of reference circuit of reference signal Vref is provided.Each circuit of the photosensitive driving unit 24 can be integrated in one by silicon technology
It controls 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 242 ' of the second driving circuit and photosensitive pixel 22 are formed together on the same substrate, reference circuit
243 ' then pass through a connection piece (for example, flexible circuit board) and connect with a plurality of signal reference line of 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 third switch (for example, the 4th transistor T4 in 221 ' of switch unit shown in Fig. 8) optionally with
The first branch circuit 2221 of 222 ' of photosensitive unit is electrically connected.When third closes the switch, reference signal Vref is logical
The third switch for crossing closure is transmitted to the first branch circuit 2221 of corresponding 222 ' of photosensitive unit.Meanwhile the reference circuit
The 4th switch (for example, the 5th transistor T5 in 221 ' of switch unit shown in Fig. 8) that 243 ' also pass through photosensitive pixel 22 can
Selectively it is electrically connected with the second branch circuit 2222 of 222 ' of photosensitive unit.When the 4th closes the switch, the reference
Signal Vref is transmitted to the second branch circuit 2222 of corresponding 222 ' of photosensitive unit by the 4th switch of closure.
First scan line of 241 ' of the first driving circuit and photosensitive device 20 is electrically connected, for line by line or interlacing provides the
One scanning drive signal is to the third switch and the 4th switch in the multiple photosensitive pixel 22, to control third switch and the 4th
It closes the switch, and when reaching the first predetermined time, control third switch and the 4th switch disconnect, to drive photosensitive unit
222 ' start to execute light sensing.
Second scan line of 242 ' of the second driving circuit and photosensitive device 20 is electrically connected, in driving photosensitive unit
222 ' start after executing light sensing, such as third switch and the 4th switch disconnects and to reach for the 4th predetermined time (shown in Fig. 9
When t3-t2), provides and export control signal to the 5th switch (such as the 6th crystal in 223 ' of signal output unit shown in Fig. 8
Pipe T6), it is closed the switch with control the 5th, and when reaching the second predetermined time, the 5th switch of control disconnects, thus conversion circuit
2231 electric signals generated when executing light sensing according to 222 ' of photosensitive unit, are converted to two different electric currents for constant current signal
Signal, and export.
Further, control mode and above-mentioned first driving circuit of 241 ' of the first driving circuit to multiple photosensitive pixels 22
The control mode of 241 pairs of multiple photosensitive pixels 22 is consistent.That is, providing first scanning drive signal to the photosensitive of current line
Pixel, and the control signal that exports is provided to the photosensitive pixel of the current line, it is executed with controlling the photosensitive pixel of the current line
After the electric signal output generated when light sensing, then first scanning drive signal is provided to the photosensitive pixel of next line, thus
It realizes the photosensitive line by line of photosensitive pixel 22, reads line by line；Alternatively, providing the first scanning drive signal to the light-sensitive image of current line
Element and when reaching a predetermined time, provides first scanning drive signal to the photosensitive pixel of next line；The predetermined time
It is to be read line by line to realize that the rolling of photosensitive pixel 22 is photosensitive an at least clock cycle.
In some embodiments, please continue to refer to Figure 10, which further comprises signal processing unit
25, the data line group in photosensitive device 20 shown in Fig. 10 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 222 ' of photosensitive unit
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
222 ' execute the electric signal generated when light sensing and are 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.
In some embodiments, Figure 12 is please referred to, Figure 12 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.Above-mentioned photosensitive driving circuit is used for
It drives multiple photosensitive pixel to execute light sensing, and controls photosensitive pixel and execute the electric signal output generated when light sensing.The sense
When light pixel 22 executes light sensing, the optical signal come for receiving top, and the optical signal received is converted into corresponding electricity
Signal, therefore the photosensitive region of multiple photosensitive pixels 22 defines to form sensing region 203, the region other than sensing region 203 is then
For non-sensing region 202.In order to facilitate route arrangement, which executes light sensing for photosensitive pixel 22 to be arranged
Required driving circuit, such as above-mentioned photosensitive driving circuit.Alternatively, the non-sensing region 202 is for being arranged electron-donating connector
The line bonding area of connection.For example, for the photosensitive driving circuit shown in Figure 11, the driving of 241 ' of the first driving circuit and second
242 ' of circuit, 243 ' of reference circuit are both formed in substrate 26.Alternatively, 241 ' of the first driving circuit, 242 ' of the second driving circuit,
243 ' of reference circuit is electrically connected by being electrically connected part (for example, flexible circuit board) and photosensitive pixel 22.
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, it is based on above-mentioned photosensitive device, the utility model embodiment also provides a kind of light sensation of photosensitive device
Survey method.3, Figure 13 shows the specific step of the light sensing method of the photosensitive device of one embodiment of the utility model referring to Fig.1
Suddenly, the photosensitive device light sensing method the following steps are included:
Step S21 successively provides the first scanning drive signal to the multiple photosensitive pixel, so that the photosensitive pixel exists
When first predetermined time reached, start to execute light sensing；
Step S22 is provided after the photosensitive pixel starts to execute light sensing and is exported control signal to the multiple photosensitive
Pixel controls the photosensitive pixel and executes the electric signal output generated when light sensing.
Further, above-mentioned steps S21 is specific can include: line by line or interlacing driving provides first scanning drive signal
To the multiple photosensitive pixel, to drive the photosensitive pixel to execute light sensing.So it may be implemented once to drive a line photosensitive
Pixel executes light sensing, to accelerate sensed speed.
Specifically, based on shown in Fig. 4 photosensitive device 20 and photosensitive pixel structure shown in Fig. 2, step S21 is specific
Are as follows: the first scanning drive signal is successively provided to the first switch in multiple photosensitive pixels 22 (for example, switch shown in Fig. 2 is single
The first transistor T1 in member 221), to control first switch closure, and when reaching the first predetermined time, control first switch
It disconnects, so that photosensitive unit 222 be driven to start to execute light sensing.
Step S22 specifically: after the first switch of switch unit 221 disconnects, provide and export control signal to multiple senses
The second switch (for example, second transistor T2 in signal output unit shown in Fig. 2 223) of light pixel 22, control second are opened
It closes and closes, so that photosensitive unit 222 executes the electric signal output generated when light sensing.
Based on photosensitive device shown in Fig. 10 and photosensitive pixel structure shown in Fig. 8, step S11 specifically: successively mention
It is switched to the third in the multiple photosensitive pixel 22 (for example, 221 ' of switch unit shown in Fig. 8 for the first scanning drive signal
In the 4th transistor T4) and the 4th switch (for example, the 5th transistor T5 in 221 ' of switch unit shown in Fig. 8), with control
Third switch processed and the 4th closes the switch, and when reaching the first predetermined time, and control third switch and the 4th switch disconnect, from
And 222 ' of photosensitive unit is driven to start to execute light sensing.
Step S22 specifically: third switch and the 4th switch disconnect and reach the 4th predetermined time (t3- shown in Fig. 9
When t2), provides and export control signal to the 5th switch (such as the 6th transistor in 223 ' of signal output unit shown in Fig. 8
T6), closed the switch with control the 5th, and when reaching the second predetermined time, the 5th switch of control disconnects, thus conversion circuit
2231 electric signals generated when executing light sensing according to 222 ' of photosensitive unit, are converted to two different electric currents for constant current signal
Signal, and export.
Further, in some embodiments, above-mentioned steps S21 further comprises: driving providing first scanning
Signal is moved to the photosensitive pixel of current line, and provides the control signal that exports to the photosensitive pixel of the current line, is somebody's turn to do with control
After the photosensitive pixel of current line executes the electric signal output generated when light sensing, then first scanning drive signal is provided under
The photosensitive pixel of a line.Need to illustrate when, the photosensitive pixel of next line here is not limited to the photosensitive pixel phase with current line
Adjacent a line photosensitive pixel, can also refer to the photosensitive pixel of interlacing.
Specifically, with continued reference to Fig. 6, the photosensitive device use is photosensitive line by line, and the mode read line by line executes light sensing.t1
Moment provides the first scanning drive signal to the photosensitive pixel of the 1st row, to drive the 1st row photosensitive pixel to execute light sensing, t2When
It carves, provides and export control signal to the photosensitive pixel of the 1st row, export photoreceptor signal to control the photosensitive pixel of the 1st row；t3When
It carves, provides the first scanning drive signal to the photosensitive pixel of the 2nd row, to drive the 2nd row photosensitive pixel to execute light sensing, t4When
It carves, provides and export control signal to the photosensitive pixel of the 2nd row, to control the photosensitive pixel output photoreceptor signal ... of the 2nd row with this
Analogize, t2m-1, the first scanning drive signal is provided to the photosensitive pixel of m row, to drive m row photosensitive pixel to execute light sensation
It surveys, t2mMoment provides and exports control signal to the photosensitive pixel of m row, exports photosensitive letter to control the photosensitive pixel of m row
Number.
When photosensitive device in the utility model embodiment executes light sensing, light sensation is executed in the photosensitive pixel of current line
The photosensitive pixel that the photoreceptor signal generated when surveying, and executing light sensing was read and then carried out next line executes light sensing, such as
This does not interfere with each other the reading of the photoreceptor signal of every a line photosensitive pixel, it is hereby achieved that accurate photoreceptor signal.In addition,
Since the time that photosensitive device executes light sensing needs is longer, so can be used as test pattern use.
Further, in some embodiments, above-mentioned steps S21 further comprises: providing the first turntable driving letter
Number to current line photosensitive pixel and when reaching a predetermined time, provide first scanning drive signal to the photosensitive of next line
Pixel；The predetermined time is an at least clock cycle.
Specifically, due in photosensitive pixel 22 photoreceptor signal by output control signal control exported, no
The light sensing time of the photosensitive pixel of colleague can be overlapped, i.e., when the photosensitive pixel of current line executes light sensing, can provide the
One scanning drive signal to next line photosensitive pixel, with drive the photosensitive pixel execute light sensing.Need to illustrate when, here
The photosensitive pixel of next line be not limited to a line photosensitive pixel adjacent with the photosensitive pixel of current line, can also refer to the sense of interlacing
Light pixel.
With continued reference to Fig. 7, the photosensitive device is photosensitive using rolling, and the mode read line by line executes light sensing.t11Moment mentions
The photosensitive pixel of the 1st row is given, for the first scanning drive signal to drive the 1st row photosensitive pixel to execute light sensing, t12Moment provides
First scanning drive signal gives the photosensitive pixel of the 2nd row, to drive the 2nd row photosensitive pixel to execute light sensing, t13Moment provides
One scanning drive signal gives the photosensitive pixel of the 3rd row, to drive the 3rd row photosensitive pixel to execute light sensing, and so on, t1mWhen
It carves, provides the first scanning drive signal to the photosensitive pixel of m row, to drive m row photosensitive pixel to execute light sensing.Each
When capable photosensitive pixel executes light sensing and reaches the predetermined time, provides and export control signal to the photosensitive pixel of the row.For example,
t21Moment, which provides, exports control signal to the photosensitive pixel of the 1st row, to control the photoreceptor signal output of the 1st row photosensitive pixel, t22
Moment, which provides, exports control signal to the photosensitive pixel of the 2nd row, to control the photoreceptor signal output of the 2nd row photosensitive pixel.
It is waited it follows that the photosensitive device 20 is executed with the time of this light sensing shorter and all photosensitive pixel
The time for reading photoreceptor signal is also consistent, that is, solves charge leakage on influence caused by photoreceptor signal acquisition, to improve
Sense precision.
Further, 4 and Figure 15, Figure 14 show the knot of the electronic equipment of one embodiment of the utility model referring to Fig.1
Structure, Figure 15 shows electronic equipment shown in Figure 14 along the cross-section structure of I-I line, and Figure 15 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 14 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 Figure 10), and is correspondingly arranged
In 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 4, Figure 15 and Figure 16, 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 photosensitive panel 200
With the assembling of display panel 300.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 17 and Figure 18, Figure 17 shows the utility model
The structure of the electronic equipment of one embodiment, Figure 18 show electronic equipment shown in Figure 17 along the cross-section structure of II-II line, and
And Figure 18 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 (14)
1. a kind of photosensitive driving circuit, it is characterised in that: the photosensitive driving circuit is for successively driving the multiple light-sensitive image
Element executes light sensing；After the photosensitive pixel starts to execute light sensing, generated when controlling photosensitive pixel execution light sensing
Electric signal output.
2. photosensitive driving circuit as described in claim 1, it is characterised in that: the multiple photosensitive pixel is in array distribution in one
A plurality of the first scan line being electrically connected respectively with the multiple photosensitive pixel is additionally provided in substrate, and in the substrate；It is described
Photosensitive driving circuit includes:
First driving circuit, it is corresponding to be electrically connected with first scan line, it is used for line by line or interlacing provides one first scanning and drives
Dynamic signal gives the multiple photosensitive pixel, to drive the multiple photosensitive pixel line by line or interlacing execution light sensing.
3. photosensitive driving circuit as claimed in claim 2, it is characterised in that: first driving circuit is further used for:
First scanning drive signal is being provided to the photosensitive pixel of current line, and is providing the control signal that exports to this
The photosensitive pixel of current line, to drive the photosensitive pixel of the current line to execute light sensing, and generated when control execution light sensing
After electric signal output, then first scanning drive signal is provided to the photosensitive pixel of next line.
4. photosensitive driving circuit as claimed in claim 2, it is characterised in that: first driving circuit is further used for:
When providing first scanning drive signal to the photosensitive pixel of current line and reaching a predetermined time, described the is provided
Photosensitive pixel of one scanning drive signal to next line；The predetermined time is an at least clock cycle.
5. photosensitive driving circuit as claimed in claim 2, it is characterised in that: be additionally provided in the substrate it is a plurality of with it is the multiple
The second scan line that photosensitive pixel is electrically connected；The photosensitive driving circuit further comprises: the second driving circuit, second drive
Dynamic circuit is corresponding to be electrically connected with second scan line, for starting to execute light sensing in each photosensitive pixel and reaching the 4th
When the predetermined time, the control signal that exports is provided and gives the photosensitive pixel, to control generation when the photosensitive pixel executes light sensing
Electric signal output.
6. photosensitive driving circuit as claimed in claim 5, it is characterised in that: second driving circuit is further used for: control
The electric signal generated when making the photosensitive pixel execution light sensing exports and continued for the second predetermined time.
7. photosensitive driving circuit as claimed in claim 6, it is characterised in that: second predetermined time is according to the light received
The intensity of signal carries out dynamic adjustment.
8. photosensitive driving circuit as claimed in claim 7, it is characterised in that: the intensity of the optical signal received is bigger,
Second predetermined time is shorter；The intensity of the optical signal received is smaller, and the second predetermined time is longer.
9. photosensitive driving circuit as claimed in claim 2, it is characterised in that: be additionally provided in the substrate with it is the multiple photosensitive
The data line that pixel is electrically connected；The photosensitive driving circuit further comprises signal processing unit, the signal processing unit
It is electrically connected with the multiple data lines, the electric signal for exporting to the photosensitive pixel is read out, and according to reading
Electric signal obtains the predetermined biological information in contact with or close to the target object of the photosensitive pixel.
10. photosensitive driving circuit as claimed in claim 9, it is characterised in that: the photosensitive driving circuit is formed in the base
On bottom or part is electrically connected by one and the multiple photosensitive pixel is electrically connected；Alternatively, the one of the photosensitive driving circuit
Partial circuit is formed on the substrate, and another part circuit is electrically connected by a connection piece and the multiple photosensitive pixel.
11. a kind of photosensitive device, it is characterised in that: including multiple photosensitive pixels and as described in any one of claim 1-10
Photosensitive driving circuit, the photosensitive driving circuit is for driving the multiple photosensitive pixel to execute light sensing, and in the sense
Light pixel starts after executing light sensing, controls the photosensitive pixel and executes the electric signal output generated when light sensing.
12. photosensitive device as claimed in claim 11, it is characterised in that: the photosensitive device is fingerprint acquisition apparatus, is used for
Acquire the finger print information of finger.
13. photosensitive device as claimed in claim 11, it is characterised in that: the photosensitive device is a biology sensing chip, is used
In obtain near to or in contact with the photosensitive device target object predetermined biological information.
14. a kind of electronic equipment, it is characterised in that: including the photosensitive device as described in any one of claim 11-13.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/120400 WO2019127572A1 (en) | 2017-12-30 | 2017-12-30 | Photosensitive drive circuit, photosensitive apparatus and electronic device |
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| CN209055953U true CN209055953U (en) | 2019-07-02 |
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| CN201790000319.1U Active CN209055953U (en) | 2017-12-30 | 2017-12-30 | Photosensitive driving circuit and photosensitive device, electronic equipment |
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| WO (1) | WO2019127572A1 (en) |
Cited By (2)
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|---|---|---|---|---|
| CN111785231A (en) * | 2020-07-09 | 2020-10-16 | 深圳市华星光电半导体显示技术有限公司 | Light sensing driving circuit and driving method thereof, display panel and display device |
| CN112183254A (en) * | 2017-12-30 | 2021-01-05 | 深圳信炜科技有限公司 | Photosensitive drive circuit, photosensitive device and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3997739B2 (en) * | 2001-10-01 | 2007-10-24 | コニカミノルタホールディングス株式会社 | Solid-state imaging device |
| KR101376228B1 (en) * | 2013-07-17 | 2014-04-01 | 실리콘 디스플레이 (주) | Fingerprint sensor capable of sensing fingerprint by optical method and capacitive method |
| CN105528598B (en) * | 2014-09-29 | 2019-03-29 | 上海箩箕技术有限公司 | Optical fingerprint sensor |
| CN105574472B (en) * | 2014-10-14 | 2019-05-28 | 上海箩箕技术有限公司 | Face battle array fingerprint sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112183254A (en) * | 2017-12-30 | 2021-01-05 | 深圳信炜科技有限公司 | Photosensitive drive circuit, photosensitive device and electronic equipment |
| CN111785231A (en) * | 2020-07-09 | 2020-10-16 | 深圳市华星光电半导体显示技术有限公司 | Light sensing driving circuit and driving method thereof, display panel and display device |
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