CN108140121A - The light sensing method of photosensitive device - Google Patents
The light sensing method of photosensitive device Download PDFInfo
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- CN108140121A CN108140121A CN201780002288.8A CN201780002288A CN108140121A CN 108140121 A CN108140121 A CN 108140121A CN 201780002288 A CN201780002288 A CN 201780002288A CN 108140121 A CN108140121 A CN 108140121A
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- 230000003287 optical effect Effects 0.000 claims description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000008280 blood Substances 0.000 claims description 4
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- 230000005540 biological transmission Effects 0.000 description 77
- 108091008695 photoreceptors Proteins 0.000 description 46
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- Transforming Light Signals Into Electric Signals (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The present invention discloses a kind of light sensing method of photosensitive device, and photosensitive device includes multiple photosensitive pixels, which includes：The first scanning drive signal is successively provided to the multiple photosensitive pixel, so that the photosensitive pixel when reaching the first predetermined time, starts to perform light sensing；After the photosensitive pixel starts to perform light sensing, provide and export control signal to the multiple photosensitive pixel, the electric signal output that the photosensitive pixel is controlled to be generated when performing light sensing.
Description
Technical field
The present invention relates to a kind of for sensing the light sensing method of the photosensitive device of biological information.
Background technology
At present, 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 of mobile terminal identification structure.
Invention content
Embodiment of the present invention is intended at least solve one of technical problem in the prior art.For this purpose, the present invention is real
The mode of applying needs to provide a kind of light sensing method of photosensitive device.
A kind of light sensing method of photosensitive device of embodiment of the present invention, the photosensitive device include multiple light-sensitive images
Element, it is characterised in that：The light sensing method includes the following steps：
The first scanning drive signal is successively provided to the multiple photosensitive pixel, so that the photosensitive pixel is predetermined first
When time reaches, start to perform light sensing；
After the photosensitive pixel starts to perform light sensing, provide and export control signal to the multiple photosensitive pixel, control
It makes the photosensitive pixel and performs the electric signal output generated during light sensing.
The light sensing method of embodiment of the present invention can not only control the photosensitive pixel light sensing time, but also pass through
Output control signal realize photosensitive unit generation electric signal in time, effectively export, so as to improve sensing precision.Separately
Outside, pass through output control signal control photosensitive pixel photoreceptor signal output so that the signal of photosensitive pixel and output terminal every
From other circuit loads is avoided to influence the photoreceptor signal of photosensitive pixels, so as to obtain accurate photoreceptor signal, are further improved
Sensing precision.
In some embodiments, the multiple photosensitive pixel is in array distribution；It is described to successively provide the first turntable driving
Signal gives the step of the multiple photosensitive pixel to further comprise：
Line by line or interlacing provides first scanning drive signal to the multiple photosensitive pixel, to drive the multiple sense
Light pixel performs light sensing line by line.
In some embodiments, it is described line by line or interlacing provides first scanning drive signal to the multiple photosensitive
In the step of pixel, photosensitive pixel of first scanning drive signal to current line is being provided, and the output control is provided
Signal gives the photosensitive pixel of the current line, with the electric signal output that the photosensitive pixel of the current line is controlled to be generated when performing light sensing
Afterwards, then photosensitive pixel of first scanning drive signal to next line is provided.
When photosensitive device in embodiment of the present invention performs light sensing, light sensing is performed in the photosensitive pixel of current line,
And the photosensitive pixel execution light sensing that the photoreceptor signal generated during light sensing was read and then carried out next line is performed, so
So that the reading per the photoreceptor signal of a line photosensitive pixel is not interfere with each other, it is hereby achieved that accurate photoreceptor signal.In addition, by
The time that a light sensing needs are performed in photosensitive device is longer, so can be used as test pattern.
In some embodiments, it is described line by line or interlacing provides first scanning drive signal to the multiple photosensitive
In the step of pixel, when providing the first scanning drive signal to the photosensitive pixel of current line and reaching a predetermined time, provide
First scanning drive signal is to the photosensitive pixel of next line；The predetermined time is an at least clock cycle.
Embodiment of the present invention rolls photosensitive mode by photosensitive device so that the photosensitive device performs a light sensing
The photoreceptor signal to be read such as time shorter and all photosensitive pixel time it is also consistent, that is, solve charge leakage pair
Influence caused by photoreceptor signal acquires, so as to improve sensing precision.
In some embodiments, it when each photosensitive pixel starts execution light sensing and reached for four predetermined times, provides
The control signal that exports is to the photosensitive pixel, with the electric signal output that the photosensitive pixel is controlled to be generated when performing light sensing.
In some embodiments, the output control signal generates for controlling during the photosensitive pixel execution light sensing
Electric signal output and continued for the second predetermined time.
In some embodiments, second predetermined time according to the intensity of the optical signal received into Mobile state tune
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.
Embodiment of the present invention adjusts the electric signal read access time of photosensitive pixel generation according to the intensity of optical signal in time, protects
The accurate reading of electric signal is demonstrate,proved, so as to improve sensing precision.
In some embodiments, the light sensing method further comprises：
The electric signal generated when performing light sensing according to the multiple photosensitive pixel of reading, obtains in contact with or close to described
The predetermined biological information of the object of photosensitive device.
In some embodiments, the predetermined biological information includes fingerprint, fingerprint, palmmprint, ear line, sole, the heart
One or more of rate, blood oxygen concentration, vein.
The additional aspect and advantage of embodiment of the present invention will be set forth in part in the description, partly will be from following
Become apparent in description or recognized by the practice of embodiment of the present invention.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of embodiment of the present invention retouch embodiment from reference to accompanying drawings below
It will be apparent and be readily appreciated that in stating, wherein：
Fig. 1 be an embodiment of the present invention photosensitive device in photosensitive pixel array distribution schematic diagram；
Fig. 2 is the electrical block diagram of one embodiment of photosensitive pixel shown in FIG. 1；
Fig. 3 be photosensitive pixel shown in Fig. 2 when performing light sensing, the signal timing diagram at each node；
Fig. 4 is photosensitive pixel and scan line, data line and signal reference line in the photosensitive device of an embodiment of the present invention
Between connection relation structure, and the photosensitive pixel be Fig. 2 shows photosensitive pixel structure；
Fig. 5 is the structure 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 performs light sensing；
Fig. 7 is the signal timing diagram for another embodiment that photosensitive device shown in Fig. 4 performs light sensing；
Fig. 8 is the electrical block diagram of another embodiment of photosensitive pixel shown in FIG. 1；
Fig. 9 be photosensitive pixel shown in Fig. 8 when performing light sensing, the signal timing diagram at each node；
Figure 10 is in the photosensitive device of an embodiment of the present invention, and photosensitive pixel is referred to scan line, data line and signal
Connection relation structure between line, and the photosensitive pixel is the photosensitive pixel structure shown in Fig. 8；
Figure 11 is the structure diagram of one embodiment of photosensitive driving unit shown in Fig. 10；
Figure 12 be an embodiment of the present invention photosensitive device in photosensitive panel structure diagram；
Figure 13 is the flow diagram of the light sensing method of the photosensitive device of an embodiment of the present invention；
Figure 14 is the structure diagram for the electronic equipment that the photosensitive device of an embodiment of the present invention is applied；
Figure 15 is diagrammatic cross-section of the electronic equipment along I-I lines shown in Figure 14, and Figure 15 shows the portion of electronic equipment
Separation structure；
Figure 16 is that the display area of the display panel of an embodiment of the present invention is corresponding with the sensing region of photosensitive panel
Position view；
Figure 17 is the structure diagram for the electronic equipment that the photosensitive device of an embodiment of the present invention is applied；
Figure 18 is diagrammatic cross-section of the electronic equipment along II-II lines shown in Figure 17, and Figure 18 shows electronic equipment
Part-structure.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that term " first ", " second " are only used for description purpose, and cannot
It is interpreted as indicating or implies relative importance or imply the quantity of the technical characteristic indicated by indicating.Define as a result, " the
One ", one or more feature can be expressed or be implicitly included to the feature of " second ".In description of the invention
In, " multiple " are meant that two or more, unless otherwise specifically defined." contact " or " touch " is including direct
Contact or mediate contact.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or electrical connection or can be in communication with each other；It can be directly connected, it can also be by between intermediary
It connects connected, can be the interaction relationship of connection inside two elements or two elements.For the ordinary skill of this field
For personnel, 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 for realizing the different structure of the present invention.In order to
Simplify disclosure of the invention, hereinafter to the component of specific examples and being set for describing.Certainly, they are merely examples, and
And it is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter,
This repetition is for purposes of simplicity and clarity, itself not indicate between discussed various embodiments and/or setting
Relationship.In addition, the present invention provides various specific techniques and material example, but those of ordinary skill in the art can be with
Recognize 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 fully understand embodiments of the present invention so as to provide.So
And one of ordinary skill in the art would recognize that, without one or more in the specific detail or using other structures,
Constituent element etc. can also put into practice technical scheme of the present invention.In other cases, it is not shown in detail or describes known features or behaviour
Make to avoid the fuzzy present invention.
Embodiment of the present invention proposes a kind of photosensitive device being set in electronic equipment, is especially set to electronic equipment
Below display screen.The display screen, which is such as, but not limited to OLED display panel etc., has the display device for sending out optical signal.Electronics is set
During standby work, display screen sends out optical signal, is shown with performing corresponding image.It if should at this point, there is target object to contact or touch
Electronic equipment, the optical signal that display screen is sent out reflect after reaching target object, and reflected optical signal passes through display screen
It is received afterwards by photosensitive device, the optical signal received is converted to electric signal corresponding with optical signal by photosensitive device, should with basis
The electric signal that photosensitive device generates forms the predetermined biological information of target object.
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 can also set the light source sensed for biological information.When this
When electronic equipment performs biological information sensing, which sends out corresponding optical signal, such as infrared light, so as to fulfill 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 is as being mobile phone, tablet computer, notebook electricity
Brain, tabletop display, computer all-in-one machine etc..Household formula electronic product is such as intelligent door lock, TV, refrigerator, Wearable.
Vehicular electronic product is such as automatic navigator, vehicle-carrying DVD.Financial terminal product such as the end for ATM machine, self-service transacting business
End etc..
Fig. 1 is please referred to, Fig. 1 shows the array distribution structure of photosensitive pixel in a photosensitive device, which wraps
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 often 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 line by line be driven from X-direction
Each row photosensitive pixel 22 performs light sensing, then the electric signal that each photosensitive pixel 22 performs light sensing and generates is read from Y-direction.
Certainly, each photosensitive pixel 22 of formation photosensitive array 201 is not limited to the 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, it is described
Sensing unit, when receiving light sensing control signal, performs light sensing for receiving light sensing control signal.Performing light sensation
During 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 performs the photoreceptor signal output generated during light sensing.
Specifically, with reference 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 embodiment of the present invention has first input end In1, second defeated
Enter to hold In2, third input terminal In3 and one first output terminal Out1.Light sensing controls signal to believe including the first turntable driving
Number.Photosensitive pixel 22 includes sensing unit and signal output unit 223, and sensing unit includes switch unit 221 and photosensitive list again
Member 222, photosensitive unit 222 is connected between switch unit 221 and signal output unit 223.Switch unit 221 is defeated by third
Enter to hold In3 to receive a reference signal Vref, driven in addition, switch unit 221 also receives one first scanning by first input end In1
Dynamic signal, and reference signal Vref is transmitted to photosensitive unit 222 when receiving the first scanning drive signal, it is photosensitive to drive
Unit 222 works.Photosensitive unit 222 converts the optical signal received when receiving optical signal for receiving optical signal
For corresponding electric signal.Signal output unit 223 receives output control signal by the second input terminal In2, and is controlled according to output
Signal processed exports the electric signal that photosensitive unit 222 generates from the first output terminal 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 output controls the duration of high level in signal pre- for second
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 reception one
Fixed telecommunication number.Two electrodes of sensor devices are applied to by reference to signal Vref and fixed telecommunication number, form 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, and wherein anode receives a predetermined electrical signals,
Such as ground signalling NGND；First electrode of the cathode as sensor devices, for receiving the reference that switch unit 221 transmits
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
During end, photodiode D1 both ends can be made to form backward voltage, so as to which photodiode D1 be driven to perform 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
Fix time arrival when, voltage Vg reaches the voltage value of reference signal Vref and remains unchanged.At this point, photodiode D1 both ends
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.If at this point, there is optical signal to be irradiated to the photodiode
D1, the reverse current of photodiode D1 increase rapidly, so as to which 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 the first capacitance c1.When first capacitance c1 is used to perform light sensing, with
Sensor devices form discharge loop, to obtain corresponding photoreceptor signal.Specifically, as shown in Fig. 2, the first capacitance c1 with it is photosensitive
Device is arranged in parallel, i.e. the first pole plate of the first capacitance c1 is connect with the cathode of photodiode D1, and the second of the first capacitance 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 the first capacitance c1, and when switch unit 221 disconnects, the first capacitance c1 and photodiode D1 formation is discharged back
Road, and the voltage (i.e. voltage Vg) of the first pole plate of the first capacitance c1 is also gradually reduced.By setting the first capacitance c1, increase
The capacitance of photosensitive unit 222, so as to reduce the voltage decrease speed on photodiode D1 cathode, it is ensured that get
Effective photoreceptor signal improves sensing precision of the photosensitive device 20 to target object.
Further, above-mentioned first capacitance c1 is variable capacitance, such as the capacitor array formed by multiple capacitances, and this is more
A capacitance is arranged in parallel, and the volume change of the first capacitance c1 is realized by the way that multiple capacitance is controlled whether to access.Due to first
Capacitance c1 is set as variable capacitance, therefore is adjusted by the capacity of first capacitance c1, adapts to the variation of optical signal received,
So as to obtain accurate and effective photoreceptor signal.Specifically, if the intensity of the optical signal received is bigger, the first capacitance c1's
Capacity is bigger, if the intensity of the optical signal received is smaller, the capacity of the first capacitance 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 in triode, metal-oxide-semiconductor, 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 connections, 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
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 the first capacitance 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, the first capacitance c1 and photodiode D1 shapes
Into discharge loop, start to perform light sensing.
In some embodiments, signal output unit 223 includes a second transistor T2 and buffer circuit.Buffer circuit
For by the electric signal that photosensitive unit 222 generates into row buffering.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 terminal Out1, for by by the buffer circuit buffering after electricity
Signal exports.
Further, buffer circuit is connected between photosensitive unit 222 and second transistor T2, for by the photosensitive list
First 222 transformed electric signals export the electric signal of buffering into row buffering, and when second transistor T2 is connected.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 are 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 performs the electric signal generated during light sensing；5th transmission electrode S5 is for one voltage signal Vcc of reception；
6th transmission electrode S6 is connect with the third transmission electrode S3 of second transistor T2, for being exported when second transistor T2 is connected
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 connections changes, do not affect the electricity of the 6th transmission electrode S6
Pressure.Moreover, because transistor characteristic, than voltage Vg, a low threshold voltage, the threshold voltage are third crystal to voltage Vs always
The threshold voltage of pipe T3.Therefore, buffer circuit plays the role of buffering isolation, is generated when photosensitive unit 222 is performed light sensing
Electric signal be isolated, other circuit loads is avoided to influence the photoreceptor signal that photosensitive units 222 generate, so as to ensure that sense
Light pixel 22 accurately performs light sensing, improves sensing precision of the photosensitive device 20 to target object.
Fig. 3 is please referred to, Fig. 3 shows the signal sequence at each node when photosensitive pixel 22 shown in Fig. 2 performs light sensing,
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 so that the first transistor T1 is connected and holds by first input end In1
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 the first capacitance 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 is protected after the voltage value for reaching reference signal Vref
It holds constant.In addition, since the first capacitance c1 is in parallel with photodiode D1, reference signal Vref also to the first capacitance c1 into
Row charging, so that the voltage on the first pole plate is gradually increasing and is kept 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-offs, discharge loop is formed between equivalent capacity and the first capacitance c1 and photodiode D1.If
There is optical signal irradiation on photodiode D1, then the current signal directly proportional to optical signal is generated inside photodiode D1, because
Voltage Vg on this photodiode D1 cathode is continuously 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 lower Vth than voltage Vg always, and the Vth is brilliant for third
The threshold voltage of body pipe T3.It should be noted that first predetermined time with ensure in photosensitive unit 22 photodiode and
First capacitance c1 charges to reference signal Vref.
T3 moment, that is, photosensitive unit 222 start to perform light sensing and after reaching for the 4th predetermined time (i.e. t3-t2),
By the second input terminal In2 input/output control signals, 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 terminal Out1.The voltage of first output terminal Out1 outputs first gradually rises up to the 6th transmission electricity from low level
Voltage Vs on the S6 of pole changes followed by the variation of the voltage Vs on the 6th transmission electrode S6.It should be noted that this
Four predetermined times were at least one clock cycle, and the 4th predetermined time cannot be long, certainly can not be too short, to ensure to feel
Light unit 222 performs the photoreceptor signal generated during 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
Ordinary mail number, second transistor T2 cut-offs, the voltage of the first output terminal Out1 outputs are gradually reduced or remain unchanged.Under ensureing
Effective output of secondary signal, the first output terminal Out1 output voltages need to gradually decrease down low level.When the above-mentioned t4 moment is with t3
This period between quarter, that is, in the second predetermined time Δ t1, the voltage Vs 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 terminal Out1, therefore defeated by reading first
The voltage signal of outlet Out1, you can the size of photoreceptor signal that photodiode D1 is generated when receiving optical signal is obtained,
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, also faster so as to the decrease speed of voltage Vs, therefore,
To realize the accurately and effectively acquisition of 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, with reference to Fig. 4, Fig. 4 shows photosensitive pixel 22 and each scan line, number in photosensitive device 20
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, data line group, the signal reference line group that are electrically connected with multiple photosensitive pixels 22.Wherein, scanline groups
Including by a plurality of first scanline groups into the first scanline groups with by a plurality of second scanline groups into the second scanline groups, number
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, and the row in Y-direction are felt
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 items, and first scan line of m items is alternatively arranged along Y-direction, such as G11,
G12、…G1m；Second scanline groups further include the second scan line of m items, and second scan line of m items is also alternatively arranged along Y-direction,
Such as G21, G22 ... G2m；Signal reference line group includes m bars reference lines, and the m bars reference line is along Y-direction interval
Arrangement, such as L1, L2 ... Lm；Data line group includes n data lines, and the n data lines are alternatively arranged in X direction, such as
S1、S2、…Sn-1、Sn.Certainly, the scanline groups of photosensitive device 20, data line group and signal reference line group may be other
Regular fashion is distributed 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 items correspondence is connect with the first input end In1 of multiple photosensitive pixels 22, and m items second are swept
It retouches line correspondence to connect with the second input terminal In2 of multiple photosensitive pixels 22, m bars reference line corresponds to and multiple photosensitive pixels 22
The In3 connections of third input terminal, n data lines correspondence connect with the first output terminal 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
Go out.
In some embodiments, photosensitive device 20 further comprises photosensitive driving circuit, which is used for
The multiple photosensitive pixel 22 is driven to perform light sensing successively；After the photosensitive pixel 22 starts to perform light sensing, control should
Photosensitive pixel 22 performs the electric signal output generated during 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.Fig. 5 is please referred to, 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
First driving circuit 241 of signal, the second driving circuit 242 that output control signal is provided and the ginseng that reference signal Vref is provided
Examine circuit 243.Each circuit of the photosensitive driving unit 24 can be integrated in by silicon technology in a control chip, 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 is formed on the same substrate together with photosensitive pixel 22, 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.When first switch is closed, reference signal Vref is then transferred to by the first switch of closure
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 first switch to be controlled to be closed, and is arrived to the first switch in photosensitive pixel 22 in the first predetermined time
Up to when, control first switch disconnect, so as to drive photosensitive unit 222 start perform light sensing.
Second scan line of the second driving circuit 242 and photosensitive device 20 is electrically connected, for being opened in each photosensitive pixel
When beginning performs light sensing and reached for four predetermined times, i.e., first switch disconnects and reached for the 4th predetermined time (for example, Fig. 3 institutes
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 is closed, so that photosensitive unit 222 performs the electricity generated during light sensing
Signal exports.
Further, in some embodiments, the first driving circuit 241 is further used for：It is swept providing described first
It retouches drive signal and exports photosensitive pixel of the control signal to the current line to the photosensitive pixel of current line and offer are described, with
The photosensitive pixel of the current line is driven to perform light sensing, and the electric signal output that the photosensitive pixel is controlled to be generated when performing light sensing
Afterwards, then photosensitive pixel of first scanning drive signal to next line is provided.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, with reference to Fig. 6, Fig. 6 shows sequential when photosensitive device shown in Fig. 4 performs light sensing, the photoreceptor cartridge
Put that use is photosensitive line by line, the mode read line by line performs light sensing.t1Moment provides the first scanning drive signal to the 1st row
Photosensitive pixel, the 1st row photosensitive pixel to be driven to perform light sensing, t2Moment provides and exports light-sensitive image of the control signal to the 1st row
Element, the photosensitive pixel of the 1st row to be controlled to export photoreceptor signal；t3Moment provides the first scanning drive signal to the photosensitive of the 2nd row
Pixel, the 2nd row photosensitive pixel to be driven to perform light sensing, t4Moment provides and exports photosensitive pixel of the control signal to the 2nd row,
With the photosensitive pixel output photoreceptor signal ... of the 2nd row of control, t2m-1, the first scanning drive signal is provided to m rows
Photosensitive pixel, with drive m rows photosensitive pixel perform light sensing, t2mMoment provides and exports control signal to the photosensitive of m rows
Pixel, the photosensitive pixel of m rows to be controlled to export photoreceptor signal.
When photosensitive device in embodiment of the present invention performs light sensing, light sensing is performed in the photosensitive pixel of current line,
And the photosensitive pixel execution light sensing that the photoreceptor signal generated during light sensing was read and then carried out next line is performed, so
So that the reading per the photoreceptor signal of a line photosensitive pixel is not interfere with each other, it is hereby achieved that accurate photoreceptor signal.In addition, by
The time that a light sensing needs are performed in photosensitive device is longer, so can be used as test pattern.
Further, in some embodiments, the first driving circuit 241 is further used for：It is driven providing the first scanning
When moving signal to the photosensitive pixel of current line and reaching a predetermined time, first scanning drive signal is provided 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 performs light sensing, can provide the
One scanning drive signal to next line photosensitive pixel, with drive the photosensitive pixel perform 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, the sense of interlacing can also be referred to
Light pixel.
With reference to Fig. 7, Fig. 7 shows sequential when photosensitive device shown in Fig. 4 performs light sensing, and the photosensitive device is using rolling
Dynamic light, the mode read line by line perform light sensing.t11Moment provides photosensitive pixel of first scanning drive signal to the 1st row,
The 1st row photosensitive pixel to be driven to perform light sensing, t12Moment provides photosensitive pixel of first scanning drive signal to the 2nd row, with
The 2nd row photosensitive pixel is driven to perform light sensing, t13Moment provides photosensitive pixel of first scanning drive signal to the 3rd row, to drive
Dynamic 3rd row photosensitive pixel performs light sensing, and so on, t1mMoment provides light-sensitive image of first scanning drive signal to m rows
Element, m rows photosensitive pixel to be driven to perform light sensing.Light sensing is performed in the photosensitive pixel of every a line and reaches the predetermined time
When, it provides and exports photosensitive pixel of the control signal to the row.Such as, t21Moment, which provides, exports light-sensitive image of the control signal to the 1st row
Element, the photoreceptor signal of the 1st row photosensitive pixel to be controlled to export, t22Moment, which provides, exports photosensitive pixel of the control signal to the 2nd row,
The photoreceptor signal of the 2nd row photosensitive pixel to be controlled to export.
It follows that the photosensitive pixel waiting that the time of the photosensitive device 20 light sensing of execution is shorter and all
The time for reading photoreceptor signal is also consistent, that is, solves influence caused by charge leakage acquires photoreceptor signal, so as 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 for what is generated when performing 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 perform 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, ground is changed, each treatment channel at least two data lines can also be correspondingly connected with, pass through
The electric signal on a data line is read in the mode of time-sharing multiplex, every time selection, 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.In embodiment of the present invention
A photosensitive pixel 22 have first input end In1 ＇, the second input terminal In2 ＇, third input terminal In3 ＇, the 4th input terminal In4,
And one first output terminal Out1 ＇, second output terminal Out2.Light sensing control signal includes the first scanning drive signal.Specifically
Ground, the photosensitive pixel 22 include 223 ＇ of sensing unit and signal output unit.Sensing unit specifically includes 221 ＇ of switch unit, sense
222 ＇ of light unit.Wherein, 221 ＇ of switch unit receives a reference signal Vref by third input terminal In3 ＇, in addition, switch is single
221 ＇ of member also receive one first scanning drive signal by first input end In1 ＇, and are receiving the first scanning drive signal
When, reference signal Vref is transmitted to 222 ＇ of photosensitive unit, 222 ＇ of photosensitive unit to be driven to perform light sensing, signal output unit
223 ＇ receive an output control signal by the second input terminal In2 ＇ and receive a constant telecommunications by the 4th input terminal In4
Number Is, with when receiving output control signal, the electric signal generated when performing light sensing according to 222 ＇ of photosensitive unit will be constant
Electric signal Is is converted to two different electric signals, and is exported from the first output terminal 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 receptions, 221 ＇ of switch unit is transmitted, and
When first predetermined time reached, start to perform 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, and the optical signal received is converted to accordingly for performing light sensing
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 capacitance c2, and sensor devices and the first electricity
Hold the first branch circuit 2221 that c1 is 222 ＇ of photosensitive unit, the second capacitance 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 the first capacitance c1 are defined here
For the first end of the first branch circuit 2221, the second pole plate of the anode of photodiode D1 and the first capacitance c1 are the first branch
The second end of circuit 2221.The operation principle of first branch circuit 2221 please refers to previously mentioned implementation.Second branch circuit
In 2222, the first pole plate is used to receive the reference signal Vref that 221 ＇ of switch unit is transmitted, the second pole in the second capacitance c2
Plate is for fixed telecommunication No. one of reception, such as earth signal NGND.Reference signal Vref charges to the second capacitance c2, so as to make
The voltage Vn obtained on the first pole plate of the second capacitance c2 is gradually increasing and is remained unchanged after the amplitude for reaching reference signal Vref.
It should be noted that the first pole plate for defining the second capacitance c2 here is the first end of the second branch circuit 2222, the second capacitance
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 in triode, metal-oxide-semiconductor, 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, drain electrodes of the 7th transmission electrode S7 for 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, drain electrodes of the 9th transmission electrode S9 for 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
Drive 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, for when the 5th transistor T5 is connected, inciting somebody to action
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 in triode, metal-oxide-semiconductor, 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, and the 12nd transmits
Electrode S12 is the source electrode of metal-oxide-semiconductor.6th coordination electrode C6 is connect with the second input terminal In2 ＇, and control signal is exported for receiving；
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
First pole plate of the cathode of pole pipe D1 and the first capacitance c1) and the second branch circuit 2222 first end (i.e. the second capacitance c2's
First pole plate)；Two output terminals 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 in triode, 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 the first capacitance 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 terminal 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 capacitance c2) connects；The 12nd transmission electrode of 15th transmission electrode S15 and the 6th transistor T6
S12 connections, for receiving the constant current signal Is that the 6th transistor T6 is transmitted；16th transmission electrode S16 and second
Output terminal Out2 connections, 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 amplitudes.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 during 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, Fig. 9 shows the signal sequence at each node when the photosensitive pixel 22 of Fig. 8 performs light sensing, wherein
Vp is the voltage signal on photodiode D1 cathode and first the first pole plates of capacitance c1；Vn is second the first pole plates of capacitance 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 outputs 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 is connected, reference signal Vref is transmitted through the 7th transmission electrode S7 and the 8th transmission electrode S8
To photodiode D1 cathode and the first capacitance c1 the first pole plate on.Due to having 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 the first capacitance c1 so that the voltage on the first pole plate of the first capacitance c1 be gradually increasing and up to
It is remained unchanged after to the voltage value of reference signal Vref.
When the 5th transistor T5 is connected, 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 capacitance c2, so as to charge to the second capacitance c2, on the second pole plate of the second capacitance c2
Voltage Vn is gradually increasing and is remained 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 ends, equivalent capacity and
Discharge loop is formed between first capacitance c1 and photodiode D1.222 ＇ of photosensitive unit starts to perform light sensing.If at this point, light
There is optical signal irradiation on electric diode D1, then the current signal directly proportional to optical signal is generated inside photodiode D1, therefore
Voltage Vp on photodiode D1 cathode is continuously decreased.Moreover, optical signal is stronger, the speed that voltage Vp is reduced is faster.When
When five transistor T5 end, since the second capacitance c2 can not form discharge loop, on the first pole plate of the second capacitance c2
Voltage Vn is remained unchanged.
At the t3 moment, by the second input terminal In2 ＇ input/output control signals, 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
Go out two different current signals of amplitude.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 terminal Out1 ＇ outputs
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 outputs
The amplitude of In is gradually risen up to the decline of current signal Ip rise after the corresponding current values of voltage Vn by low level.And
And one is exaggerated compared to electric signal all the way if the electric signal exported after the two paths of differential signals is input in difference amplifier
Times, so as to have the function that signal amplifies.
T4 moment, output control signal switch to low level signal, therefore the second input terminal In2 ＇ become by high level signal
Low level signal, then the 6th transistor T6 cut-offs, the first output terminal 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, is passed through
Obtain corresponding current signal at the first output terminal Out1 ＇ and second output terminal Out2, and according to the two-way current signal, i.e.,
The size of photoreceptor signal that 222 ＇ of photosensitive unit performs light sensing and generates can be obtained, and then generates 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 long, can not be too short, to ensure photosensitive letter
It number timely and effectively exports.Because during the t2 moment, 222 ＇ of photosensitive unit starts to perform light sensing, will generate corresponding telecommunications
Number, the timely output of interval time long possible photoreceptor signal, interval time, too short possible 222 ＇ of photosensitive unit had not enough time to produce
Raw effective photoreceptor signal can control the electric signal that 222 ＇ of photosensitive unit is generated timely and effectively to export.
The photosensitive pixel 22 of embodiment of the present invention is controlled by the output of photoreceptor signal, can guarantee that photoreceptor signal has in time
The output of effect, and pass through conversion circuit 2231 so that the current signal that photosensitive unit 222 performs light sensing and generates is with two-way
The mode of differential signal exports, it is achieved thereby that the amplification of electric signal, improves the sensing precision of photosensitive device 20.In addition, by
It is current signal in the two paths of differential signals, with respect to the output of voltage signal, improves the antijamming capability of signal, further
Improve the sensing precision of photosensitive device 20.
Further, with reference to Figure 10, Figure 10 is shown in the photosensitive device of another embodiment of the present invention, photosensitive pixel with
Connection structure between scan line, data line and signal reference line, and the photosensitive pixel is the circuit structure shown in Fig. 8.Sense
Electro-optical device 20 further comprises the scanline groups, data line group, signal reference line group being electrically connected with multiple photosensitive pixels 22.Its
In, scanline groups include by a plurality of first scanline groups into the first scanline groups with by a plurality of second scanline groups into second
Scanline groups, data line group include a plurality of first data line, a plurality of second data line, a plurality of third data line, signal reference line
Group includes a plurality of signal reference line.By taking the photosensitive array 201 in Fig. 1 as an example, in the photosensitive array 201, a line sense in X-direction
Light pixel includes spaced n photosensitive pixel 22, and it is a photosensitive that the row photosensitive pixel in Y-direction includes spaced m
Pixel 22, therefore the photosensitive array 201 includes m*n photosensitive pixel altogether.Scanline groups, the data being connect with photosensitive pixel 22
Line group, the quantity of signal reference line group are correspondingly arranged.Specifically, the first scanline groups include the first scan line of m items, m items second
Scan line, and first scan line of m items is alternatively arranged along Y-direction, such as G11, G12 ... G1m, second scan line of m items also edge
Y-direction is alternatively arranged, such as G21, G22 ... G2m.Signal reference line group includes m bars reference lines, and the m bars refers to
Line is alternatively arranged along Y-direction, such as L1, L2 ... Lm.Data line group includes the first data line of n items, the second data line of n items, n items
Third data line, and first data line of n items is alternatively arranged in X direction, such as S11, S12 ... S1n；Second data line of n items
Also it is alternatively arranged in X direction, such as S21, S22 ... S2n；The n third data line is also alternatively arranged in X direction, such as S31,
S32、…S3n.Certainly, the scanline groups of photosensitive device 20, data line group and signal reference line group may be other rule sides
Formula is distributed or non-regular distribution.In addition, due to the first scan line, the second scan line, signal reference line and the first data line,
Second data line, third data line are respectively provided with electric conductivity, thus between each circuit being in the crossed position by insulating materials into
Row isolation.
Specifically, the first scan line of m items correspondence is connect with the first input end In1 ＇ of multiple photosensitive pixels 22, m items second
Scan line correspondence is connect with the second input terminal In2 ＇ of multiple photosensitive pixels 22, and m bars reference line corresponds to and multiple light-sensitive images
The third input terminal In3 ＇ connections of element 22, the first data line of n items is corresponded to be connected with the first output terminal Out1 ＇ of multiple photosensitive pixels 22
It connects, the second data line of n items correspondence is connect with the second output terminal Out2 of multiple photosensitive pixels 22, third data line and photosensitive pixel
22 the 4th input terminal In4 connections.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 driven to perform light sensing successively；After the photosensitive pixel starts to perform light sensing, control this photosensitive
Pixel performs the electric signal output generated during 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 function module of the photosensitive driving unit of an embodiment of the present invention.The photosensitive driving unit 24 includes carrying
242 ＇ of the second driving circuit of 241 ＇ of the first driving circuit, offer output control signal for the first scanning drive signal and offer
243 ＇ of reference circuit of reference signal Vref.Each circuit of the photosensitive driving unit 24 can be integrated in a control by silicon technology
In chip, each circuit of certain photosensitive driving unit 24 can also be formed separately from different control chips.For example, first
241 ＇ of driving circuit and 242 ＇ of the second driving circuit is formed on the same substrate together with photosensitive pixel 22, and 243 ＇ of reference circuit is then
It is connect by a connection piece (for example, flexible PCB) 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 is switched and is closed, reference signal Vref leads to
Cross the first branch circuit 2221 that the third switch being closed is transmitted to corresponding 222 ＇ of photosensitive unit.Meanwhile the reference circuit
243 ＇ can also by the 4th switch (for example, the 5th transistor T5 in 221 ＇ of switch unit shown in Fig. 8) of photosensitive pixel 22
Selectively the second branch circuit 2222 with 222 ＇ of photosensitive unit is electrically connected.When the 4th switch is closed, 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 gives third switch and the 4th switch in the multiple photosensitive pixel 22, to control third switch and the 4th
Switch is closed, and when reaching the first predetermined time, and control third switch and the 4th switch disconnect, so as to drive photosensitive unit
222 ＇ start to perform light sensing.
Second driving circuit, 242 ＇ and the second scan line of photosensitive device 20 are electrically connected, in driving photosensitive unit
222 ＇ start after performing 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), provide 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, and with the 5th switch of control when reaching the second predetermined time, the 5th switch of control disconnects, so as to conversion circuit
2231 electric signals generated when performing light sensing according to 222 ＇ of photosensitive unit, two different electric currents are converted to by constant current signal
Signal, and export.
Further, control modes 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 described export is provided and controls photosensitive pixel of the signal to the current line, the photosensitive pixel of the current line to be controlled to perform
After the electric signal output generated during light sensing, then photosensitive pixel of first scanning drive signal to next line is provided, so as to
It realizes the photosensitive line by line of photosensitive pixel 22, reads line by line；Alternatively, providing light-sensitive image of first scanning drive signal to current line
Element and when reaching a predetermined time, provides photosensitive pixel of first scanning drive signal to next line；The predetermined time
It it is an at least clock cycle, the rolling so as to fulfill photosensitive pixel 22 is photosensitive, reads line by line.
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 one constant current signal of offer；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 perform 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 by silicon technology in a detection chip.It is appreciated that
It is that, in order to collect accurately and effectively electric signal, within second scheduled time, which can be to photosensitive unit
222 ＇ perform the electric signal generated during 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, ground is changed, 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 of channel is managed, so as to save the cost of photosensitive device 20.
In some embodiments, Figure 12 is please referred to, Figure 12 shows the photosensitive device of another embodiment of the present invention
Structure.The photosensitive device 20 further comprises a photosensitive panel 200, and the photosensitive panel 200 is multiple photosensitive again including a substrate 26
Pixel 22 is set in the substrate 26.Optionally, which is in array distribution.Above-mentioned photosensitive driving circuit is used to drive
Multiple photosensitive pixel performs light sensing, and the electric signal output that photosensitive pixel is controlled to be generated when performing light sensing.The light-sensitive image
When element 22 performs light sensing, for receiving the optical signal that top is come, and the optical signal received is converted into corresponding electric signal,
Therefore the photosensitive region of multiple photosensitive pixels 22 defines to form sensing region 203, and the region other than sensing region 203 is then non-sense
Survey region 202.In order to facilitate route arrangement, which is used to that photosensitive pixel 22 to be set to perform needed for light sensing
Driving circuit, such as above-mentioned photosensitive driving circuit.Alternatively, the non-sensing region 202 is used to set electron-donating connector connection
Line bonding area.For example, by taking the photosensitive driving circuit shown in Figure 11 as an example, 241 ＇ of the first driving circuit and the second driving circuit
242 ＇, 243 ＇ of reference circuit are both formed in substrate 26.Alternatively, 241 ＇ of the first driving circuit, 242 ＇ of the second driving circuit, reference
243 ＇ of circuit is electrically connected by being electrically connected part (for example, flexible PCB) with 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 PCB) with photosensitive pixel 22.For example, work as
When the substrate 26 is silicon base, the signal processing unit 25 may be optionally formed in substrate 26, and also alternative such as passes through
Flexible PCB is electrically connected with photosensitive pixel 22；When the substrate 26 is dielectric base, the signal processing unit 25 is then
It needs for example to be electrically connected by flexible PCB 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, based on above-mentioned photosensitive device, embodiment of the present invention also provides a kind of light sensing side of photosensitive device
Method.The specific steps of the light sensing method of the photosensitive device of an embodiment of the present invention are shown with reference to Figure 13, Figure 13, this is photosensitive
The light sensing method of device includes the following steps：
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 perform light sensing；
Step S22 after the photosensitive pixel starts to perform light sensing, is provided and is exported control signal to the multiple photosensitive
Pixel, the electric signal output that the photosensitive pixel is controlled to be generated when performing light sensing.
Further, above-mentioned steps S21 specifically may include：Line by line or interlacing driving provides first scanning drive signal
To the multiple photosensitive pixel, the photosensitive pixel to be driven to perform light sensing.It can so realize that primary driving a line is photosensitive
Pixel performs light sensing, so as 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
For：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), first switch to be controlled to be closed, and when reaching the first predetermined time, control first switch
It disconnects, so as to which photosensitive unit 222 be driven to start to perform light sensing.
Step S22 is specially：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 performs the electric signal output generated during light sensing.
It is specially based on photosensitive device shown in Fig. 10 and photosensitive pixel structure shown in Fig. 8, step S11：It carries successively
It is switched for the first scanning drive signal to the third in the multiple photosensitive pixel 22 (for example, 221 ＇ of switch unit shown in Fig. 8
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 and the 4th switch processed are closed, 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 perform light sensing.
Step S22 is specially：Third switchs and the 4th switch disconnects and reaches the 4th predetermined time (t3- shown in Fig. 9
When t2), provide and export control signal to the 5th switch (such as the 6th transistor in 223 ＇ of signal output unit shown in Fig. 8
T6), it is closed, and with the 5th switch of control when reaching the second predetermined time, the 5th switch of control disconnects, so as to conversion circuit
2231 electric signals generated when performing light sensing according to 222 ＇ of photosensitive unit, two different electric currents are converted to by constant current signal
Signal, and export.
Further, in some embodiments, above-mentioned steps S21 further comprises：It is driven providing first scanning
Photosensitive pixel of the signal to current line is moved, and described export is provided and controls photosensitive pixel of the signal to the current line, it should with control
After the photosensitive pixel of current line performs the electric signal output generated during 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 performs light sensing.t1
Moment provides photosensitive pixel of first scanning drive signal to the 1st row, the 1st row photosensitive pixel to be driven to perform light sensing, t2When
It carves, provides and export photosensitive pixel of the control signal to the 1st row, the photosensitive pixel of the 1st row to be controlled to export photoreceptor signal；t3When
It carves, photosensitive pixel of first scanning drive signal to the 2nd row is provided, the 2nd row photosensitive pixel to be driven to perform light sensing, t4When
It carves, provides and export photosensitive pixel of the control signal to the 2nd row, the photosensitive pixel of the 2nd row to be controlled to export photoreceptor signal ... with this
Analogize, t2m-1, photosensitive pixel of first scanning drive signal to m rows is provided, m rows photosensitive pixel to be driven to perform light sensation
It surveys, t2mMoment provides and exports photosensitive pixel of the control signal to m rows, the photosensitive pixel of m rows to be controlled to export photosensitive letter
Number.
When photosensitive device in embodiment of the present invention performs light sensing, light sensing is performed in the photosensitive pixel of current line,
And the photosensitive pixel execution light sensing that the photoreceptor signal generated during light sensing was read and then carried out next line is performed, so
So that the reading per the photoreceptor signal of a line photosensitive pixel is not interfere with each other, it is hereby achieved that accurate photoreceptor signal.In addition, by
The time that a light sensing needs are performed in photosensitive device is longer, so can be used as test pattern.
Further, in some embodiments, above-mentioned steps S21 further comprises：First turntable driving letter is being provided
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 performs light sensing, can provide the
One scanning drive signal to next line photosensitive pixel, with drive the photosensitive pixel perform 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, the sense of interlacing can also be referred to
Light pixel.
With continued reference to Fig. 7, the photosensitive device is photosensitive using rolling, and the mode read line by line performs light sensing.t11Moment carries
The photosensitive pixel of the 1st row is given for the first scanning drive signal, the 1st row photosensitive pixel to be driven to perform light sensing, t12Moment provides
First scanning drive signal gives the photosensitive pixel of the 2nd row, the 2nd row photosensitive pixel to be driven to perform light sensing, t13Moment provides
One scanning drive signal gives the photosensitive pixel of the 3rd row, the 3rd row photosensitive pixel to be driven to perform light sensing, and so on, t1mWhen
It carves, photosensitive pixel of first scanning drive signal to m rows is provided, m rows photosensitive pixel to be driven to perform light sensing.Each
When capable photosensitive pixel performs light sensing and reaches the predetermined time, provide and export photosensitive pixel of the control signal to the row.For example,
t21Moment, which provides, exports photosensitive pixel of the control signal to the 1st row, the photoreceptor signal of the 1st row photosensitive pixel to be controlled to export, t22
Moment, which provides, exports photosensitive pixel of the control signal to the 2nd row, the photoreceptor signal of the 2nd row photosensitive pixel to be controlled to export.
It is waited for it follows that the photosensitive device 20 performs photosensitive pixel shorter with the time of this light sensing and all
The time for reading photoreceptor signal is also consistent, that is, solves influence caused by charge leakage acquires photoreceptor signal, so as to improve
Sense precision.
Further, the structure of the electronic equipment of an embodiment of the present invention, figure are shown with reference to Figure 14 and Figure 15, Figure 14
15 show cross-section structure of the electronic equipment along I-I lines shown in Figure 14, and Figure 15 illustrates only the part knot of electronic equipment
Structure.The electronic equipment includes above-mentioned any one photosensitive device for implementing structure, is not only shown for the image of electronic equipment, but also be used for
The biological information of target object in contact with or close to electronic equipment is sensed.
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 is as being mobile phone, tablet computer, notebook electricity
Brain, tabletop display, computer all-in-one machine etc..Household formula electronic product is such as intelligent door lock, TV, refrigerator, Wearable.
Vehicular electronic product is such as automatic navigator, vehicle-carrying DVD.Financial terminal product such as the end for ATM machine, self-service transacting business
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 module 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 300,300 top of display panel are equipped with cover sheet 400.Optionally, the screen accounting of the display panel 300 is higher, such as
More than 80%.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 represented, or curved-surface structure.In this way, 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 transformed electric signal in contact with or close to electronic equipment
The predetermined biological information of target object.
In embodiment of the present invention, the electronic equipment is in addition to the effect with the photosensitive device 20 described in the above embodiment
Outside fruit, the biological information for also realizing target object using the optical signal that display panel 300 is sent out senses, and does not need to additionally set
Light source is put, so as to not only save the cost of electronic equipment, and also achieves the display for docking tactile or touch display panel 300
Target object carries out biological information sensing in region 305.In addition, after the photosensitive device 20 can be separately made, then carry out
The assembling of electronic equipment, so as to accelerate the preparation of electronic equipment.
When mobile terminal 3 is in bright screen state and is in biological information sensing modes, which sends out
Optical signals.When an object is in contact with or close to the viewing area, which receives by the reflected light letter of the object
Number, the optical signal received is converted as corresponding electric signal, and the predetermined biological characteristic letter of the object is obtained according to the electric signal
Breath, for example, information in fingerprint.So as 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 display effect can be realized
Fruit and with the display device of transmission region passed through for optical signal in protection scope of the present invention.In addition, display panel 300
Can be bottom emitting structure, emission structure at top, transparent two sides structure, moreover, the display screen can be the hard screen of rigid,
It can be the flexible screen of flexible material.
In some embodiments, photosensitive panel 200 is used to perform to any position in the display area of display panel 300
Target object biological information sensing.For example, specifically, such as incorporated by reference to reference to Figure 14, 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 zone of element 32 defines, and the region other than display area 305 is non-display area 306, and non-display area 306 is used to set
Drive the line bonding area of the circuits such as the display driver circuit of display pixel 32 or setting for flexible PCB connection.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 used to set
Drive the 24 grade circuits of photosensitive driving unit or the line bonding for flexible PCB connection that photosensitive pixel 22 performs light sensing
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 the 305 arbitrary position of display area of display panel 300
The sensing of the predetermined biological information for the target object put.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, 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 more than
The area of display panel 300.
In some embodiments, the sensing region 203 of the photosensitive panel 200 is alternatively less than display panel 300
Display area 305, to realize that the predetermined biological characteristic of the target object of the regional area of 300 display area 305 of display panel is believed
The sensing of breath.
Further, display device is further used for performing touch-sensing, when the display device detects target object
Touch or close to after, the position for controlling the display panel corresponding touch area shines.
So, ground is changed, in some embodiments, please refers to Figure 17 and Figure 18, it is real Figure 17 shows the present invention one
The structure of the electronic equipment of mode is applied, Figure 18 shows cross-section structure of the electronic equipment along II-II lines shown in Figure 17, Er Qietu
18 illustrate only the part-structure of electronic equipment.The photosensitive module of embodiment of the present invention is applied to a mobile terminal 3, the movement
The front of terminal is equipped with a display panel 300, which is equipped with cover sheet 400.The display panel 300
It is higher to shield accounting, such as more than 80%.Screen accounting refers to that the actual displayed region 305 of display panel 300 is accounting for mobile terminal just
The ratio in face region.One is equipped in the actual displayed region 305 of the display panel 300 at lower position for target object touch
Biological sensing region S, to carry out the biological information of target object sensing, such as target object is finger, then the biology is felt
Survey region S is fingerprint recognition region, to carry out fingerprint recognition.Accordingly, corresponding fingerprint identification area domain in 300 lower section of display panel
The position of S is equipped with a photosensitive device 20, which is used for when finger is positioned over fingerprint recognition region S, obtains the hand
The fingerprint image of finger.It is understood that it is for user's hand-held mobile terminal to be set in display panel 300 lower position
When, facilitate the position of finger touch display panel 300.It is of course also possible to it is set to the other positions that finger is facilitated to touch.
In some embodiments, electronic equipment further comprises a touch sensor (not shown), is touched by this
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, when a target object contacts the cover sheet 400, determine the touch area of the target object, with driving
The display pixel of corresponding touch area is lighted and photosensitive pixel performs light sensing.
In some embodiments, the touch sensor either with the cover sheet 400 is integrated or and photosurface
Plate 200 is integrated or integrated with display panel 300.By integrated touch sensor, not only realize and target object is touched
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 ", " is schematically implemented " certain embodiments "
The description of mode ", " example ", " specific example " or " some examples " etc. means with reference to the embodiment or example description
Particular features, structures, materials, or characteristics are contained at least one embodiment or example of the present invention.In this specification
In, 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 in an appropriate manner combine in any one or more embodiments or example.
Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiment is
Illustratively, it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be right
The above embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of light sensing method of photosensitive device, the photosensitive device includes multiple photosensitive pixels, it is characterised in that：The light
Method for sensing includes the following steps：
The first scanning drive signal is successively provided to the multiple photosensitive pixel, so that the photosensitive pixel is in the first predetermined time
During arrival, start to perform light sensing；
After the photosensitive pixel starts to perform light sensing, provide and export control signal to the multiple photosensitive pixel, control institute
It states photosensitive pixel and performs the electric signal output generated during light sensing.
2. the light sensing method of photosensitive device as described in claim 1, it is characterised in that：The multiple photosensitive pixel is in array
Distribution；First scanning drive signal that successively provides further comprises to the step of the multiple photosensitive pixel：
Line by line or interlacing provides first scanning drive signal to the multiple photosensitive pixel, to drive the multiple light-sensitive image
Element performs light sensing line by line.
3. the light sensing method of photosensitive device as claimed in claim 2, it is characterised in that：It is described line by line or interlacing provide described in
First scanning drive signal was given in the step of the multiple photosensitive pixel, was providing first scanning drive signal to current line
Photosensitive pixel, and provide it is described export control signal to the current line photosensitive pixel, to control the light-sensitive image of the current line
After element performs the electric signal output generated during light sensing, then provide light-sensitive image of first scanning drive signal to next line
Element.
4. the light sensing method of photosensitive device as claimed in claim 2, it is characterised in that：It is described line by line or interlacing provide described in
First scanning drive signal was given in the step of the multiple photosensitive pixel, was providing sense of first scanning drive signal to current line
Light pixel and when reaching a predetermined time, provides photosensitive pixel of first scanning drive signal to next line；It is described predetermined
Time is an at least clock cycle.
5. the light sensing method of photosensitive device as claimed in claim 4, it is characterised in that：Each photosensitive pixel starts to perform light
When sensing and reaching for four predetermined times, the control signal that exports is provided and gives the photosensitive pixel, the photosensitive pixel to be controlled to hold
The electric signal output generated during row light sensing.
6. the light sensing method of photosensitive device as claimed in claim 5, it is characterised in that：The output control signal is used to control
The photosensitive pixel is made to perform the electric signal output generated during light sensing and continued for the second predetermined time.
7. the light sensing method of photosensitive device as claimed in claim 6, it is characterised in that：Second predetermined time is according to connecing
The intensity of the optical signal received is adjusted into Mobile state.
8. the light sensing method of photosensitive device as claimed in claim 7, it is characterised in that：The optical signal received it is strong
Degree is bigger, and the second predetermined time is shorter；The intensity of the optical signal received is smaller, and the second predetermined time is longer.
9. the light sensing method of photosensitive device as described in claim 1, it is characterised in that：The light sensing method is further wrapped
It includes：
The electric signal generated when performing light sensing according to the multiple photosensitive pixel of reading, obtains in contact with or close to described photosensitive
The predetermined biological information of the object of device.
10. the light sensing method of photosensitive device as claimed in claim 9, it is characterised in that：The predetermined biological information
Including one or more of fingerprint, fingerprint, palmmprint, ear line, sole, heart rate, blood oxygen concentration, vein.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/120404 WO2019127576A1 (en) | 2017-12-30 | 2017-12-30 | Light sensing method for photosensitive device |
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