CN106375687B - pixel sensing device and control method - Google Patents
pixel sensing device and control method Download PDFInfo
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- CN106375687B CN106375687B CN201610720385.8A CN201610720385A CN106375687B CN 106375687 B CN106375687 B CN 106375687B CN 201610720385 A CN201610720385 A CN 201610720385A CN 106375687 B CN106375687 B CN 106375687B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
- H04N25/75—Circuitry for providing, modifying or processing image signals from the pixel array
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- Transforming Light Signals Into Electric Signals (AREA)
Abstract
The invention discloses a pixel sensing device which comprises a transistor, a capacitor, a photodiode, a first resetting unit, a second resetting unit, a transmission unit, a control unit and a reading unit. The transistor comprises a first end, a control end and a second end. The photodiode includes an anode terminal and a cathode terminal, and senses the light source to output a signal voltage. The first reset unit resets the voltage of the cathode terminal according to the first reset signal. The second reset unit outputs a reset voltage to the control terminal according to the second reset signal. The transmission unit transmits the signal voltage of the cathode terminal to the control terminal according to the transmission signal, and couples the signal voltage to the second terminal through the capacitor. The control unit is used for providing power supply voltage to the first end according to the control signal. The reading unit reads current according to the reading signal.
Description
Technical field
The present invention about a kind of sensing device and its control method, and in particular to a kind of pixels sense device and
Its control method.
Background technique
It include multiple transistors and capacitor in general active pixel sensor, to sense light source and correspondingly generate electric current.
However, after due to the influence or long-time operation of processing procedure, the critical voltage of multiple transistors in each active pixel sensor
(Vth) can be not identical, in this case, even if giving each active pixel sensor identical irradiation amount, each active pixel
Electric current caused by sensor still suffers from difference, leads to the electric current read error.
It can be seen that above-mentioned existing mode, it is clear that there are still inconvenient and defects, and have much room for improvement.It is above-mentioned in order to solve
Problem, related fields there's no one who doesn't or isn't painstakingly seeks solution, but does not develop solution appropriate yet for a long time.
Summary of the invention
Summary of the invention be intended to provide the content of present invention simplify abstract so that reader have to the content of present invention it is basic
Understand.The invention content is not the complete overview of the content of present invention, and its be not intended to point out the embodiment of the present invention it is important/
Key element defines the scope of the present invention.
One purpose of the content of present invention is to provide a kind of pixels sense device and its control method, and using improves existing skill
The problem of art.
In order to achieve the above object, a technology aspect of the content of present invention is about a kind of pixels sense device, this pixels sense dress
It sets comprising the first transistor, first capacitor, photodiode, the first reset cell, the second reset cell, transfer unit, control
Unit, reading unit, first capacitor and the second capacitor.The first transistor includes first end, control terminal and second end.First is brilliant
Body is effective to export an electric current.First capacitor is coupled between the control terminal of the first transistor and second end.Photodiode packet
Containing anode tap and cathode terminal, this photodiode is to sense light source with output signal voltage.First reset cell is coupled to light
The cathode terminal of electric diode, to reset the voltage of cathode terminal according to the first reset signal.Second reset cell is coupled to
The control terminal of one transistor, to according to the second reset signal with to control terminal export reset voltage.Transfer unit is coupled to yin
Extremely between control terminal, this transfer unit to according to transmitting signal the signal voltage of cathode terminal is transferred to control terminal,
And through first capacitor coupled signal voltage to second end.Control unit is coupled to the first end of the first transistor, to basis
Control signal supplies voltage to first end to provide power supply.Reading unit is coupled to the second end of the first transistor, to basis
Signal is read to read electric current.Second capacitor is coupled between control unit and reading unit.
In order to achieve the above object, another technology aspect of the content of present invention is about a kind of control method, this control method is used
To control pixels sense device.Pixels sense device include transistor, capacitor and photodiode, transistor include first end,
Control terminal and second end, photodiode include anode tap and cathode terminal, and capacitor is coupled between control terminal and second end.This control
Method processed comprises the steps of: during compensation, and the voltage of cathode terminal is reset according to the first reset signal；The root during compensation
According to the second reset signal reset voltage is written to control terminal；In a data address period, according to transmitting signal with by photoelectricity two
The signal voltage of the cathode terminal output of pole pipe is transferred to control terminal, and through capacitively coupled signal voltage to second end；In reading
Period supplies voltage to first end to provide power supply according to control signal, wherein transistor during reading according to control terminal with
Voltage between second end is to export electric current；And during reading, according to reading signal to read electric current.
Therefore, technology contents according to the present invention, the embodiment of the present invention is by providing a kind of pixels sense device and control
Method, using improves pixels sense device causes the electric current read to have because the critical voltage (Vth) of transistor in it is different
The problem of institute's error.
After refering to following description, the technical staff in the technical field of the invention, which works as, can will readily appreciate that the present invention
Essence spirit and other goals of the invention and the technology used in the present invention means and state sample implementation.
Detailed description of the invention
For above and other purpose, feature, advantage and embodiment of the invention can be clearer and more comprehensible, Detailed description of the invention is such as
Under:
Fig. 1 is the schematic diagram that a kind of pixels sense device is painted according to one embodiment of the invention.
Fig. 2 is to be painted a kind of control waveform diagram according to the embodiment of the present invention.
Fig. 3 is the detailed circuit schematic that pixels sense device is painted according to present invention embodiment shown in FIG. 1.
Fig. 4 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.
Fig. 5 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.
Fig. 6 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.
Fig. 7 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.
Fig. 8 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.
Fig. 9 is the flow chart for being painted a kind of control method according to another embodiment of the present invention.
According to usual operation mode, various features are not drawn to scale with element in figure, drafting mode be in order to
Specific features and element related to the present invention are presented in optimal manner.In addition, between different attached drawings, with the same or similar
Component symbol censures similar elements/components.
Wherein, appended drawing reference:
110: the first reset cells
120: the second reset cells
130: transfer unit
140: control unit
150: reading unit
500: integral unit
900: method
910~970: step
C1~C3: capacitor
D: first end
EM: control signal
G: control terminal
IOUT: electric current
N: cathode terminal
PD: photodiode
P1~P5: period
Reset1~Reset2: reset signal
S: second end
Select: signal is read
SW: switch
T1~T6: transistor
TX: transmitting signal
VDD: power supply supplies voltage
Vref: reference voltage
Vrst: reset voltage
Vsig: signal voltage
Vss: voltage
Vth: critical voltage
Specific embodiment
In order to keep the narration of the content of present invention more detailed with it is complete, below for state sample implementation of the invention and specific
Embodiment proposes illustrative description；But this not implements or uses the unique forms of the specific embodiment of the invention.Embodiment party
The feature of multiple specific embodiments is covered in formula and to construction and the method and step for operating these specific embodiments and its
Sequentially.However, can also reach identical or impartial function and sequence of steps using other specific embodiments.
Unless this specification is defined otherwise, technology belonging to the meaning and the present invention of science and technology vocabulary used herein is led
Technical staff in domain understands identical as usual meaning.In addition, in the case of getting along well context conflict, this specification institute
Singular noun covers the complex number type of the noun；And also cover the singular type of the noun when used plural noun.
In addition, about " coupling " used herein, can refer to two or multiple element mutually directly make entity or be electrically connected with
Touching, or mutually put into effect indirectly body or in electrical contact is also referred to as two or multiple element mutual operation or movement.
Fig. 1 is the schematic diagram that a kind of pixels sense device is painted according to one embodiment of the invention.As shown, pixels sense
Device includes the first transistor T1, first capacitor C1, the second capacitor C2, photodiode PD, the first reset cell 110, second
Reset cell 120, transfer unit 130, control unit 140 and reading unit 150.The first transistor T1 includes first end D, control
Hold G and second end S.Photodiode PD includes anode tap and cathode terminal N.
In in connection relationship, the first reset cell 110 is coupled to the cathode terminal N of photodiode PD, and can receive power supply
Supply voltage VDDAnd the first reset signal Reset1.The cathode terminal N and first that transfer unit 130 is coupled to photodiode PD is brilliant
Between the control terminal G of body pipe T1, and it can receive transmitting signal TX.Second reset cell 120 is coupled to the control of the first transistor T1
End G processed, and can receive reset voltage VrstAnd the second reset signal Reset2.First capacitor C1 is coupled to the first transistor T1's
Between control terminal G and second end S.Control unit 140 is coupled to the first end D of the first transistor T1, and can receive power supply supply
Voltage VDDAnd control signal EM.Reading unit 150 is coupled to the second end S and external integral unit 500 of the first transistor T1
Between, and can receive and read signal Select.Second capacitor C2 is coupled between control unit 140 and reading unit 150.
For make the embodiment of the present invention pixels sense device mode of operation it can be readily appreciated that referring to Figure 2 together, for according to
A kind of control waveform diagram is painted according to the embodiment of the present invention.As shown in figure Fig. 1 and Fig. 2, photodiode PD is to sense light
Source is with output signal voltage.First reset cell 110 to during compensation P2 according to the first reset signal Reset1 to reset
The voltage of cathode terminal N.Second reset cell 120 to during compensation P2 according to the second reset signal Reset2 to control terminal
Reset voltage V is written in Grst, so that second end S is gradually in reset voltage VrstDeduct the critical voltage of transistor T1.During integral
P3 is that photodiode PD exposes the time of integration.
In addition, transfer unit 130 in data address period P4 according to transmitting signal TX with by the signal of cathode terminal N electricity
Pressure is transferred to control terminal G, and through first capacitor C1 coupled signal voltage to second end S.The P5 during reading, control unit
140 to provide power supply supply voltage V according to control signal EMDDTo first end D, the first transistor T1 according to control terminal G with
Voltage between second end S is to export electric current, and reading unit 150 is to according to reading signal Select to read above-mentioned electric current.
In this way, due to the pixels sense of this case be installed on it is above-mentioned during, to the first transistor T1 reset with
And compensation, the critical voltage of the electric current for exporting the first transistor T1 with itself is unrelated, therefore, is able to be effectively improved pixel sense
Device is surveyed because of the critical voltage (V of transistor in itth) it is different and cause the electric current read error the problem of.
Also referring to Fig. 1 and Fig. 2, for example, the first reset cell 110 during compensation P2 according to the of high levels
One reset signal Reset1 is to reset the voltage of cathode terminal N.Then, the second reset cell 120 during compensation P2 according to a high position
The second quasi- reset signal Reset2 is to be written reset voltage V to control terminal Grst, poor to form first voltage in second end S
(Vrst-Vth)。
Then, photodiode PD senses light source to generate signal voltage V in its cathode terminal Nsig, transfer unit 130 is in number
According to address period P4 according to the transmitting signal TX of high levels with by the signal voltage V of cathode terminal NsigIt is transferred to control terminal G, and thoroughly
Cross first capacitor C1 coupled signal voltage VsigTo second end S, to form the poor (V of first voltage in second end Srst-Vth) and second
Voltage difference (Vsig-Vrst) * a voltage and ((Vrst-Vth)+(Vsig-Vrst)*a).Then, the P5 during reading, control unit 140
To provide power supply supply voltage V according to the control signal EM of high levelsDDTo first end D, at this point, the first transistor T1
According to above-mentioned voltage and ((Vrst-Vth)+(Vsig-Vrst) * a) to export electric current IOUT, above-mentioned parameter a is the capacitor of first capacitor C1
Value and the capacitance of first capacitor C1 and the second capacitor C2 and ratio, relational expression is as follows:
The electric current I generated according to aforesaid operationsOUTIt will be with critical voltage VthIt is unrelated, illustrate as after.
Firstly, the current formula of transistor is as follows:
Voltage V between the control terminal G and second end S of the P5 during reading, the first transistor T1GSFor Vsig-((Vrst-
Vth)+(Vsig-Vrst) * a), by above-mentioned voltage VGSIt brings formula 1 into, obtains the electric current I of the first transistor T1OUTIt is as follows:
After above-mentioned formula 2 is arranged, following formula is obtained:
By formula 3 it is found that even if influence or long-time of the transistor used in active pixel sensor based on processing procedure are grasped
After work, and lead to critical voltage VthDifference, the electric current I that the reading unit 150 of the pixels sense device of this case exportsOUTReally with
The critical voltage V of the first transistor T1thIt is unrelated, therefore, it is able to be effectively improved in the prior art based on critical voltage VthIt is different and
Cause the electric current read error the problem of.
Referring to Fig. 2, P2 overlaps with the part P3 during integral during compensation.Therefore, the pixels sense device of this case is upper
Compensation and integration operation can be performed simultaneously by stating in the period that overlaps, to promote the execution efficiency of pixels sense device.
Also referring to Fig. 1 and Fig. 2, control unit 140 is in baseline P1 according to control signal EM to write to first end D
Enter power supply supply voltage VDD, reading unit 150 is in baseline P1 according to reading signal Select to second end S write-in reference electricity
Press Vref.In one embodiment, baseline P1 overlaps with the part P5 during reading.In another embodiment, referring to Fig. 2, just
P1 and P5 during reading can be same period during beginning, that is, the pixels sense device of this case can be performed simultaneously initialization and read
Current practice, to promote the execution efficiency of pixels sense device.
Fig. 3 is the detailed circuit schematic that pixels sense device is painted according to present invention embodiment shown in FIG. 1.As schemed
Showing, the first reset cell 110 includes second transistor T2, this second transistor T2 includes first end, control terminal and second end, the
The first end of two-transistor T2 is to receive power supply supply voltage VDD, the control terminal of second transistor T2 is to receive the first resetting
Signal Reset1, the second end of second transistor T2 are coupled to the cathode terminal N of photodiode PD.In addition, the second reset cell
120 include third transistor T3, this third transistor T3 includes first end, control terminal and second end, and the of third transistor T3
One end is to receive reset voltage Vrst, for the control terminal of third transistor T3 to receive the second reset signal Reset2, third is brilliant
The second end of body pipe T3 is coupled to the control terminal G of the first transistor T1.Furthermore transfer unit 130 includes the 4th transistor T4, this
4th transistor T4 includes first end, control terminal and second end, and the first end of the 4th transistor T4 is coupled to photodiode PD
The control terminal of cathode terminal N, the 4th transistor T4 be coupled to the to receive transmitting signal TX, the second end of the 4th transistor T4
The control terminal G of one transistor T1.
In addition, control unit 140 includes the 5th transistor T5, this 5th transistor T5 includes first end, control terminal and the
Two ends, the first end of the 5th transistor T5 is to receive power supply supply voltage VDD, the control terminal of the 5th transistor T5 is to receive
Control signal EM.The second end of 5th transistor T5 is coupled to the first end D of the first transistor T1.On the other hand, reading unit
150 include the 6th transistor T6, this 6th transistor T6 includes first end, control terminal and second end, and the of the 6th transistor T6
The control terminal that one end is coupled to the second end S, the 6th transistor T6 of the first transistor T1 reads signal Select to receive, the
The second end of six transistor T6 is coupled to the inverting input terminal of external integral unit 500.In addition, the second capacitor C2 is coupled to
Between the first end of five transistor T5 and the second end S of the first transistor T1, and it is couple to the first end of the 6th transistor T6.This
Outside, integral unit 500 includes amplifier, third capacitor C3 and switch SW.Third capacitor C3 is coupled to the anti-phase input of amplifier
Between end and output end.Switch SW is also coupled between the inverting input terminal of amplifier and output end.The anti-phase input of amplifier
End is coupled to the second end of the 6th transistor T6, and the non-inverting input of amplifier is to receive reference voltage Vref。
Fig. 4 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.Also referring to
Fig. 2 and Fig. 4 is high levle signal in baseline P1, reading signal Select, and the 6th transistor T6 is according to reading signal
Select and be connected, meanwhile, the inverting input terminal of the amplifier of integral unit 500 and non-inverting input equipotential and be ginseng
Examine voltageVref, therefore, the 6th transistor T6 can be by the reference voltage V of inverting input terminalrefThe second of the first transistor T1 is written
Hold S.In addition, control signal EM is high levle signal, the 5th transistor T5 is connected according to control signal EM, to provide power supply confession
Answer voltage VDDTo first end D.Furthermore remaining signal is all low level calibration signal, therefore, second transistor T2, third transistor T3,
4th transistor T4 is all not turned on.During this, photodiode PD can be used to sense light source and generate letter in its cathode terminal N
Number voltage, however, since second transistor T2 and the 4th transistor T4 are all not turned on, the cathode of photodiode PD
Hold N can be to ground terminal VSSElectric discharge, and photodiode PD will not transmit the control terminal G of signal voltage to the first transistor T1.Again
Person, third transistor T3 are not turned on, therefore, reset voltage VrstIt will not be transferred to the control terminal G of the first transistor T1, accordingly,
The first transistor T1 according to control terminal G and second end S voltage difference and do not turn on.
Fig. 5 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.Also referring to
Fig. 2 and Fig. 5, the P2 during compensation, the first reset signal Reset1 are high levle signal, and second transistor T2 is according to the first resetting
Signal Reset1 and be connected, by power supply supply voltage VDDThe cathode terminal N of photodiode PD is written.In addition, control signal EM
It is still high levle signal, the 5th transistor T5 is connected according to control signal EM, to provide power supply supply voltage VDDTo first
Hold D.Furthermore remaining signal is all low level calibration signal, therefore, third transistor T3, the 4th transistor T4 and the 6th transistor T6
All it is not turned on.During this, since the 4th transistor T4 is all not turned on, photodiode PD will not transmit signal
Voltage to the first transistor T1 control terminal G.Furthermore third transistor T3 is not turned on, therefore, reset voltage VrstIt will not pass
Be handed to the control terminal G of the first transistor T1, accordingly, the first transistor T1 according to control terminal G and second end S voltage difference and do not lead
It is logical.In addition, the 6th transistor T6 is not turned on, therefore, the reverse side of integral unit 500 not will receive voltage, and its switch SW
Short circuit, accordingly, integral unit 500 not will do it integral to read any signal.
Fig. 6 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.Also referring to
Fig. 2 and Fig. 6, the P2 during compensation, the second reset signal Reset2 are high levle signal, and third transistor T3 is according to the second resetting
Signal Reset2 and be connected, with to the first transistor T1 control terminal G be written reset voltage Vrst, to form first in second end S
Voltage difference (Vrst-Vth).In addition, control signal EM is still high levle signal, the 5th transistor T5 is led according to control signal EM
It is logical, to provide power supply supply voltage VDDTo first end D.Furthermore remaining signal is all low level calibration signal, therefore, second transistor
T2, the 4th transistor T4 and the 6th transistor T6 are all not turned on.During this, photodiode PD can be used to sense light source and
Signal voltage is generated in its cathode terminal N, however, since second transistor T2 and the 4th transistor T4 are all not turned on, light
The cathode terminal N of electric diode PD can be to ground terminal VSSElectric discharge.In addition, the 6th transistor T6 is not turned on, and therefore, integral unit
500 reverse side not will receive voltage, and the SW short circuit of its switch, and accordingly, it is any to read that integral unit 500 not will do it integral
Signal.
Fig. 7 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.Also referring to
Fig. 2 and Fig. 7 senses light source in data address period P4, photodiode PD to generate signal voltage V in its cathode terminal Nsig, pass
Delivery signal TX is high-order calibration signal, and the 4th transistor T4 is connected according to transmitting signal TX, by the cathode of photodiode PD
Hold the signal voltage V of NsigIt is transferred to the control terminal G of the first transistor T1, and penetrates first capacitor C1 coupled signal voltage VsigExtremely
Second end S, to form the poor (V of first voltage in the second end S of the first transistor T1rst-Vth) and the poor (V of second voltagesig-Vrst)*
The voltage and ((V of arst-Vth)+(Vsig-Vrst)*a).Furthermore remaining signal is all low level calibration signal, therefore, second transistor
T2, third transistor T3, the 5th transistor T5, the 6th transistor T6 are all not turned on.In addition, the 6th transistor T6 is not led
Logical, therefore, the reverse side of integral unit 500 not will receive voltage, and its switch SW is short-circuit, and accordingly, integral unit 500 will not be into
Row integral is to read any signal.
Fig. 8 is the operation chart that pixels sense device is painted according to present invention embodiment shown in Fig. 3.Also referring to
Fig. 2 and Fig. 8, the P5 during reading, control signal EM are high-order calibration signal, and the 5th transistor T5 is led according to control signal EM
It is logical, to provide power supply supply voltage VDDTo the first end D of the first transistor T1, at this point, the first transistor T1 can be according to control
Hold the voltage V of GsigWith the voltage and ((V of second end Srst-Vth)+(Vsig-Vrst) * a) to export electric current IOUT, according to aforesaid operations
And the electric current I generatedOUTIt will be with critical voltage VthIt is unrelated.Furthermore reading signal Select is high levle signal, the 6th transistor
T6 is connected according to signal Select is read, to read electric current IOUT.The ginseng of the voltage sum of above-mentioned the first transistor T1 second end S
Number a be the capacitance of first capacitor C1 and the capacitance of first capacitor C1 and the second capacitor C2 and ratio, relational expression is as follows:
The electric current I generated according to aforesaid operationsOUTIt will be with critical voltage VthIt is unrelated, illustrate as after.
Firstly, the current formula of transistor is as follows:
Voltage V between the control terminal G and second end S of the P5 during reading, the first transistor T1GSFor Vsig-((Vrst-
Vth)+(Vsig-Vrst) * a), by above-mentioned voltage VGSIt brings formula 1 into, obtains the electric current I of the first transistor T1OUTIt is as follows:
After above-mentioned formula 2 is arranged, following formula is obtained:
By formula 3 it is found that even if influence or long-time of the transistor used in active pixel sensor based on processing procedure are grasped
After work, and lead to critical voltage VthDifference, the electric current I of the 6th transistor T6 output of the pixels sense device of this caseOUTReally with
The critical voltage V of the first transistor T1thIt is unrelated, therefore, it is able to be effectively improved in the prior art based on critical voltage VthIt is different and
Cause the electric current read error the problem of.In addition, remaining signal is all low level calibration signal, therefore, second transistor T2,
Third transistor T3, the 4th transistor T4 are all not turned on.During this, the switch SW open circuit of integral unit 500, and by the 6th
Transistor T6 receives electric current IOUTAnd integration operation is carried out to it, it is strong will correspond to the light source that photodiode PD is sensed
The electric current I of degreeOUTRead into external circuit.In addition, photodiode PD in still can be used to sense light source at this time and in its cathode
N is held to generate signal voltage, however, since second transistor T2 and the 4th transistor T4 are all not turned on, photodiode
The cathode terminal N of PD can be to ground terminal VSSElectric discharge.
Fig. 9 is the flow chart for being painted a kind of control method according to another embodiment of the present invention.As shown, this is controlled
Method 900 can be used to control pixels sense device as shown in Figure 1, and it includes following steps:
Step 910: in baseline, according to reading signal reference voltage is written to second end；
Step 920: in baseline, according to control signal to supply voltage to first end write-in power supply；
Step 930: during compensation, the voltage of cathode terminal is reset according to the first reset signal；
Step 940: according to the second reset signal reset voltage is written to control terminal during compensation；
Step 950: during integral, photodiode exposes and generates signal voltage in the cathode terminal of photodiode；
Step 960: in data address period, the signal for being exported the cathode terminal of photodiode according to transmitting signal is electric
Pressure is transferred to control terminal, and through capacitively coupled signal voltage to second end；
Step 970: during reading, supplying voltage to first end to provide power supply according to control signal, wherein transistor
According to the voltage between its control terminal and second end to export electric current during reading；And
Step 980: during reading, according to reading signal to read electric current.
To make the control method 900 of the embodiment of the present invention it can be readily appreciated that also referring to Fig. 1, Fig. 2 and Fig. 9.In step
In 910, in baseline P1, be written by reading unit 150 according to reading signal Select with the second end S to transistor T1
Reference voltage Vref.In step 920, in baseline P1, by control unit 140 according to control signal EM to transistor
The first end D write-in power supply of T1 supplies voltage VDD.In step 930, the P2 during compensation, by the first reset cell 110
The voltage of the cathode terminal N of photodiode PD is reset according to the first reset signal Reset1.In step 940, during compensation
Reset voltage is written with the control terminal G to transistor T1 according to the second reset signal Reset2 by the second reset cell 120 in P2
Vrst, so that the second end S of transistor T1 is gradually in the poor (V of first voltagerst-Vth).In step s 950, the P3 during integral, light
Electric diode PD exposure integral simultaneously generates signal voltage in cathode terminal N.In one embodiment, referring to Fig. 2, compensation during P2 with
The part P3 overlaps during integral.
In step 960, in data address period P4, by transfer unit 130 according to transmitting signal TX with by photoelectricity two
The signal voltage V of the cathode terminal N output of pole pipe PDsigIt is transferred to control terminal G, and penetrates capacitor C1 coupled signal voltage VsigTo
Two end S, to form the poor (V of first voltage in second end Srst-Vth) and the poor (V of second voltagesig-Vrst) * a voltage and ((Vrst-
Vth)+(Vsig-Vrst)*a).In step 970, the P5 during reading, by control unit 140 according to control signal EM to provide
Power supply supplies voltage VDDTo first end D, in addition, the voltage V of the P5 during reading, transistor T1 according to control terminal GsigWith second
Hold the voltage and ((V of Srst-Vth)+(Vsig-Vrst) * a) to export electric current, the electric current that is generated according to aforesaid operations will with it is critical
Voltage VthIt is unrelated.In step 980, the P5 during reading, by reading unit 150 according to reading signal Select to read electricity
Stream.The voltage of above-mentioned the first transistor T1 second end S and parameter a be first capacitor C1 capacitance and first capacitor C1 and the
The ratio of the capacitance sum of two capacitor C2, relational expression are as follows:
The electric current I generated according to aforesaid operationsOUTIt will be with critical voltage VthIt is unrelated, illustrate as after.
Firstly, the current formula of transistor is as follows:
Voltage V between the control terminal G and second end S of the P5 during reading, the first transistor T1GSFor Vsig-((Vrst-
Vth)+(Vsig-Vrst) * a), by above-mentioned voltage VGSIt brings formula 1 into, obtains the electric current I of the first transistor T1OUTIt is as follows:
After above-mentioned formula 2 is arranged, following formula is obtained:
By formula 3 it is found that even if the transistor used in the pixels sense device that control method 900 is controlled is based on processing procedure
Influence or long-time operation after, and lead to critical voltage VthDifference, via this case control method 900 to pixels sense device
Control, so that the electric current I that the 6th transistor T6 of pixels sense device is exportedOUTReally with the critical voltage of the first transistor T1
VthIt is unrelated, therefore, it is able to be effectively improved in the prior art based on critical voltage VthIt is different and the electric current read is caused to be missed
The problem of difference.
Those of ordinary skill in the art is when it can be appreciated that each step in control method 900 was executed according to it
Function is named, be only in order to make the technology of this case more obvious and easy to understand, be not limited to this and etc..Each step is given
To be integrated into same step or be split into multiple steps, or either step is replaced into another step and is executed, all still fallen within
The embodiment of the content of present invention.
By aforementioned present invention embodiment it is found that the application present invention has following advantages.The embodiment of the present invention is by offer
A kind of pixels sense device and control method, using improves pixels sense device leads because the critical voltage of transistor in it is different
Cause the electric current that reads error the problem of.
Although disclosing specific embodiments of the present invention in embodiment above, however, it is not to limit the invention, this
The technical staff of technical field that the present invention belongs to, in the case of not departing from the principle of the present invention and spirit, when can be carried out respectively to it
It kind changes and modification, therefore protection scope of the present invention is when being subject to subsidiary claims protection scope institute defender.
Claims (13)
1. a kind of pixels sense device, characterized by comprising:
One the first transistor includes a first end, a control terminal and a second end, to export an electric current；
One first capacitor is coupled between the control terminal of the first transistor and the second end；
One photodiode includes an anode tap and a cathode terminal, to sense a light source to export a signal voltage；
One first reset cell is coupled to the cathode terminal of the photodiode, to according to one first reset signal to reset
The voltage of the cathode terminal；
One second reset cell is coupled to the control terminal of the first transistor, to according to one second reset signal to this
Control terminal exports a reset voltage；
One transfer unit is coupled between the cathode terminal and the control terminal, to according to a transmitting signal with by the cathode terminal
The signal voltage is transferred to the control terminal, and couples the signal voltage to the second end through the first capacitor；
One control unit is coupled to the first end of the first transistor, to provide power supply confession according to a control signal
Answer voltage to the first end；
One reading unit is coupled to the second end of the first transistor, to read signal according to one to read the electric current；With
And
One second capacitor, is coupled between the control unit and the reading unit.
2. pixels sense device as described in claim 1, which is characterized in that the control unit is according to the control signal to this
Power supply supply voltage is written in first end, and a reference voltage is written to the second end according to the reading signal in the reading unit.
3. pixels sense device as described in claim 1, which is characterized in that first reset cell includes:
One second transistor includes:
One first end, to receive power supply supply voltage；
One control terminal, to receive first reset signal；And
One second end is coupled to the cathode terminal.
4. pixels sense device as described in claim 1, which is characterized in that second reset cell includes:
One third transistor includes:
One first end, to receive the reset voltage；
One control terminal, to receive second reset signal；And
One second end is coupled to the control terminal of the first transistor.
5. pixels sense device as described in claim 1, which is characterized in that the transfer unit includes:
One the 4th transistor includes:
One first end is coupled to the cathode terminal；
One control terminal, to receive the transmitting signal；And
One second end is coupled to the control terminal of the first transistor.
6. pixels sense device as described in claim 1, which is characterized in that the control unit includes:
One the 5th transistor includes:
One first end, to receive power supply supply voltage；
One control terminal, to receive the control signal；And
One second end is coupled to the first end of the first transistor.
7. pixels sense device as described in claim 1, which is characterized in that the reading unit includes:
One the 6th transistor includes:
One first end is coupled to the second end of the first transistor；
One control terminal, to receive the reading signal；And
One second end.
8. a kind of control method, to control a pixels sense device, which is characterized in that the pixels sense device includes a crystal
Pipe, a capacitor and a photodiode, the transistor include a first end, a control terminal and a second end, the photodiode
Comprising an anode tap and a cathode terminal, wherein the capacitor is coupled between the control terminal and the second end, wherein the control method
Include:
During a compensation, the voltage of the cathode terminal is reset according to one first reset signal；
According to one second reset signal a reset voltage is written to the control terminal during the compensation；
A signal voltage in a data address period, according to a transmitting signal to export the cathode terminal of the photodiode
It is transferred to the control terminal, and through capacitive coupling signal voltage to the second end；
During one reads, supply voltage to the first end to provide a power supply according to a control signal, wherein the transistor in
According to the voltage between the control terminal and the second end to export an electric current during the reading；And
During the reading, signal is read to read the electric current according to one.
9. control method as claimed in claim 8, which is characterized in that also include:
A baseline before during the compensation, according to the control signal power supply supply voltage is written to the first end.
10. control method as claimed in claim 9, which is characterized in that also include:
In the baseline, according to the reading signal a reference voltage is written to the second end.
11. control method as claimed in claim 8, which is characterized in that during the compensation according to second reset signal with
The step of reset voltage is written to the control terminal includes:
The reset voltage is provided during the compensation to the control terminal, it is poor to form a first voltage in the second end, wherein should
First voltage difference is the voltage difference of the reset voltage and a critical voltage.
12. control method as claimed in claim 11, which is characterized in that in the data address period, according to the transmitting signal
It is transferred to the control terminal with the signal voltage for exporting the cathode terminal of the photodiode, and penetrates the capacitive coupling letter
The step of number voltage to second end, include:
In the data address period through the capacitive coupling signal voltage to the second end, in the second end formed this first
One voltage of voltage difference and second voltage difference and, the second voltage difference for the signal voltage and the reset voltage voltage difference.
13. control method as claimed in claim 12, which is characterized in that the transistor is during the reading according to the control terminal
The step of voltage between the second end is to export the electric current includes:
The transistor is during the reading according to the voltage and to export the electric current.
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| TW105121615A TWI592917B (en) | 2016-07-07 | 2016-07-07 | Pixel sensing device and method for controlling the same |
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| CN109215580B (en) * | 2018-09-18 | 2020-05-05 | 昆山国显光电有限公司 | Pixel circuit structure and driving method thereof |
| TWI745014B (en) * | 2020-08-07 | 2021-11-01 | 友達光電股份有限公司 | Optical sensing circuit and touch display apparatus including the same |
| CN113469076B (en) * | 2020-08-17 | 2023-04-21 | 友达光电股份有限公司 | Fingerprint sensing device and display equipment comprising same |
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| CN1368825A (en) * | 2001-02-05 | 2002-09-11 | 凌阳科技股份有限公司 | Active pixel sensor with separation of resetting transistor with voltage source of other circuits |
| CN1791184A (en) * | 2004-12-14 | 2006-06-21 | 原相科技股份有限公司 | Active pixel sensor and image sensing module for simplifying transistor structure |
| CN104469189A (en) * | 2013-09-12 | 2015-03-25 | 恒景科技股份有限公司 | Imaging processing circuit |
| CN104867434A (en) * | 2015-05-07 | 2015-08-26 | 北京大学深圳研究生院 | Photoelectric sensor and display panel |
| CN105654907A (en) * | 2016-02-18 | 2016-06-08 | 友达光电股份有限公司 | Pixel circuit and driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4762030B2 (en) * | 2006-03-31 | 2011-08-31 | 三洋電機株式会社 | Photodetector |
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- 2016-07-07 TW TW105121615A patent/TWI592917B/en active
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|---|---|---|---|---|
| CN1368825A (en) * | 2001-02-05 | 2002-09-11 | 凌阳科技股份有限公司 | Active pixel sensor with separation of resetting transistor with voltage source of other circuits |
| CN1791184A (en) * | 2004-12-14 | 2006-06-21 | 原相科技股份有限公司 | Active pixel sensor and image sensing module for simplifying transistor structure |
| CN104469189A (en) * | 2013-09-12 | 2015-03-25 | 恒景科技股份有限公司 | Imaging processing circuit |
| CN104867434A (en) * | 2015-05-07 | 2015-08-26 | 北京大学深圳研究生院 | Photoelectric sensor and display panel |
| CN105654907A (en) * | 2016-02-18 | 2016-06-08 | 友达光电股份有限公司 | Pixel circuit and driving method |
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| TWI592917B (en) | 2017-07-21 |
| TW201802783A (en) | 2018-01-16 |
| CN106375687A (en) | 2017-02-01 |
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