CN109872683A - A kind of pixel circuit, display panel and driving method - Google Patents
A kind of pixel circuit, display panel and driving method Download PDFInfo
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Abstract
The application provides a kind of pixel circuit, display panel and driving method, to provide a kind of Novel pixel circuit structure for being integrated with fingerprint recognition driving circuit and pixel-driving circuit.The pixel circuit, it include: the pixel-driving circuit and ultrasonic fingerprint recognition driving circuit for being coupled to same first power end, wherein, the ultrasound fingerprint recognition circuit includes: lines recognition means, the first resetting sub-circuit, acquisition sub-circuit, the first charging sub-circuit and reads sub-circuit, in reset phase, public voltage signal end is connected the first reset signal that the first resetting sub-circuit is configured to respond to the first reset signal end with first node；In acquisition phase, the lines recognition means received signal is transferred to the first node by the first scanning signal that the acquisition sub-circuit is configured to respond to the first scanning signal end, and the first charging sub-circuit is configured as the signal storage to the first node.
Description
Technical field
This application involves technical field of semiconductors more particularly to a kind of pixel circuits, display panel and driving method.
Background technique
In recent years, with the high speed development of technology, the mobile product with bio-identification function progresses into the life of people
In work living, fingerprint technique is applied to the modes such as secure payment and other user experiences by feat of its unique identities characteristic, standby
It is paid close attention to by people.Push type and slide fingerprint identification technology based on silicon-based technology have been integrated into mobile product, similar
Fingerprint identification function is all applied in mobile phone by apple, the cell phone manufacturers such as Huawei, but fingerprint device generally more is placed on non-show
Show region, and need to be separately provided by touching region, the following core concerned by people is the fingerprint identification technology in display area.
The fingerprint recognition mode of vibration of ultrasonic wave, can increase the accuracy of fingerprint recognition, because ultrasonic technology can be with
The corium information below of finger is detected, is referred to compared to more other optical finger prints and capacitance type fingerprint identification technology, ultrasonic wave
It is stronger that line knows technology anti-interference ability, therefore can achieve more accurate identification method.
But there are the integrated level of fingerprint recognition driving circuit and pixel-driving circuit difference to ask for the display device of the prior art
Topic.
Summary of the invention
The application provides a kind of pixel circuit, display panel and driving method, and being integrated with fingerprint recognition to provide one kind drives
The Novel pixel circuit structure of dynamic circuit and pixel-driving circuit.
The embodiment of the present application provides a kind of pixel circuit, comprising: is coupled to the pixel-driving circuit of same first power end
With ultrasonic fingerprint recognition driving circuit, wherein the ultrasound fingerprint recognition circuit includes: lines recognition means, the first resetting
Circuit, acquisition sub-circuit, the first charging sub-circuit and reading sub-circuit；
In reset phase, the first resetting sub-circuit is configured to respond to the first resetting letter at the first reset signal end
Number public voltage signal end is connected with first node；In acquisition phase, the acquisition sub-circuit is configured to respond to first
The lines recognition means received signal is transferred to the first node by first scanning signal at scanning signal end, and described
One charging sub-circuit is configured as the current potential storage to the first node；In the stage of reading, the reading sub-circuit is configured
To read the institute of the first charging sub-circuit storage according to the current potential of the current potential of the first node and first power end
State signal.
In a kind of possible embodiment, the first end of the first resetting sub-circuit and first reset signal end
Coupling, second end and the public voltage signal end couple, and third end and the first node couple；
The first end of the acquisition sub-circuit and first scanning signal end couple, second end and the lines identifier
Part coupling, third end and the first node couple；
One end and ground of the first charging sub-circuit couple, and the other end and the first node couple；
The first end for reading sub-circuit and the first node couple, and second end and first power end couple,
Third end and reading signal wire coupling.
In a kind of possible embodiment, the reading sub-circuit includes: that first switch transistor, the first source follow drive
Dynamic transistor, rectifier diode；
First source follows the grid of driving transistor and the first node to couple, the first pole and first power supply
First pole of end coupling, the second pole and the first switch transistor couples；
The grid of the first switch transistor and the first signal control terminal couple, the second pole and the reading signal wire coupling
It connects；
One end of the rectifier diode and first power end couple, and the other end and the first node couple.
In a kind of possible embodiment, the first resetting sub-circuit includes: second switch transistor；
The grid of the second switch transistor and first reset signal end couple, the first pole and the common voltage
Signal end coupling, the second pole and the first node couple.
In a kind of possible embodiment, the acquisition sub-circuit includes: third switching transistor；
The grid of the third switching transistor and first scanning signal end couple, and the first pole and the lines identify
Device coupling, the second pole and the first node couple.
In a kind of possible embodiment, the first charging sub-circuit includes: first capacitor device；
One end and ground of the first capacitor device couple, and the other end and the first node couple.
In a kind of possible embodiment, the pixel-driving circuit includes: the second resetting sub-circuit, charge control
Circuit, the second source follow driving transistor, the second charging sub-circuit, light emitting control sub-circuit and luminescent device；
In the reset phase, the second resetting sub-circuit is configured to respond to second weight at the second reset signal end
Ground is connected confidence number with second node；In the acquisition phase, the charge control sub-circuit is configured to respond to second
Data signal end is connected second scanning signal at scanning signal end with the second node, and the second charging sub-circuit is matched
It is set to the current potential storage to the second node；In light emitting phase, the light emitting control sub-circuit is configured as according to described
The current potential of the current potential of two nodes and first power end controls second source and follows photophore described in driving transistor driving
Part shines.
In a kind of possible embodiment, the first end of the second resetting sub-circuit and second reset signal end
Coupling, second end and ground couple, and third end and the second node couple；
The first end of the charge control sub-circuit and second scanning signal end couple, and second end and the data are believed
Number end coupling, third end and the second node couple；
Second source follows the grid of driving transistor and the second node to couple, the first pole and third node coupling
It connects, the second pole and fourth node couple, and the third node is also coupled with the charge control sub-circuit, and the fourth node is also
It is coupled with the light emitting control sub-circuit；
One end and second source end of the second charging sub-circuit couple, and the other end and the second node couple；
The first end of the light emitting control sub-circuit and first power end couple, second end and the second node coupling
It connects, third end and the luminescent device couple.
In a kind of possible embodiment, second reset signal is identical as first reset signal；Described
Two scanning signals are identical as first scanning signal.
The embodiment of the present application also provides a kind of display panel, including the pixel circuit as described in provided by the embodiments of the present application.
The embodiment of the present application also provides a kind of driving method of pixel circuit as described in provided by the embodiments of the present application, packet
It includes:
Reset phase loads the first reset signal to the first reset signal end, resets sub-circuit for common electrical by first
Pressure signal end is connected with first node；
In acquisition phase, the first scanning signal is loaded to the first scanning signal end, by acquiring sub-circuit for the lines
Recognition means received signal is transferred to the first node, by the first charging sub-circuit to the electricity of the first node
Pressure storage；
In the stage of reading, Xiang Suoshu first control signal end loads first control signal, by reading sub-circuit according to institute
The current potential of first node and the current potential of the first power end are stated, the signal of the first charging sub-circuit storage is read.
In a kind of possible embodiment, further includes:
In the reset phase, the second reset signal is loaded to the second reset signal end, it will by the second resetting sub-circuit
Second node and ground are connected；
In the acquisition phase, the second scanning signal is loaded to the second scanning signal end, it will by charge control sub-circuit
Data signal end is connected with the second node, is stored by current potential of the second charging sub-circuit to the second node；
In the light emitting phase, by light emitting control sub-circuit according to the second node, the electricity of first power end
Position, the second source of control follow driving light emission drive transistor device to shine.
The embodiment of the present application has the beneficial effect that: pixel circuit provided by the embodiments of the present application, comprising: is coupled to same
The pixel-driving circuit of one power end and ultrasonic fingerprint recognition driving circuit, wherein the ultrasound fingerprint recognition circuit includes: line
Road recognition means, the first resetting sub-circuit, acquisition sub-circuit, the first charging sub-circuit and sub-circuit is read, in reset phase,
The first resetting sub-circuit is configured to respond to first reset signal at the first reset signal end for public voltage signal end
It is connected with first node；In acquisition phase, the acquisition sub-circuit is configured to respond to the first of the first scanning signal end and sweeps
It retouches signal and the lines recognition means received signal is transferred to the first node, the first charging sub-circuit is configured
For the current potential storage to the first node；In the stage of reading, the reading sub-circuit is configured as according to the first node
Current potential and first power end current potential, read it is described first charging sub-circuit storage signal, that is, the embodiment of the present application
In, ultrasonic fingerprint recognition driving circuit and pixel-driving circuit are connected to same first power end, when carrying out lines identification, surpass
Sound fingerprint recognition driving circuit can be compatible with the coherent signal of pixel-driving circuit, make fingerprint recognition driving circuit and pixel driver
Circuit is integrated, and realizes the integrated of ultrasonic fingerprint recognition driving circuit and pixel-driving circuit.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of ultrasonic fingerprint recognition driving circuit provided by the embodiments of the present application；
Fig. 2 is a kind of structural schematic diagram of specific ultrasonic fingerprint recognition driving circuit provided by the embodiments of the present application；
A kind of Fig. 3 structural schematic diagram of pixel circuit provided by the embodiments of the present application；
A kind of Fig. 4 structural schematic diagram of specific pixel circuit provided by the embodiments of the present application；
Fig. 5 is a kind of structural schematic diagram of display panel provided by the embodiments of the present application；
Fig. 6 is a kind of flow diagram of the driving method of pixel circuit provided by the embodiments of the present application；
Fig. 7 is a kind of timing diagram of pixel circuit provided by the embodiments of the present application；
Fig. 8 is the electrical block diagram provided by the embodiments of the present application in reset phase；
Fig. 9 is the electrical block diagram provided by the embodiments of the present application in acquisition phase；
Figure 10 is the electrical block diagram provided by the embodiments of the present application at the stage of reading；
Figure 11 is the electrical block diagram provided by the embodiments of the present application in light emitting phase.
Specific embodiment
The realization process of the embodiment of the present application is described in detail with reference to the accompanying drawings of the specification.It should be noted that
Same or similar label indicates same or similar element or element with the same or similar functions from beginning to end.Lead to below
It crosses the embodiment being described with reference to the drawings to be exemplary, is only used for explaining the application, and should not be understood as the limitation to the application.
Referring to Fig. 1, the embodiment of the present application provides a kind of pixel circuit, comprising: is coupled to same first power end Vdd's 1
Pixel-driving circuit and ultrasonic fingerprint recognition driving circuit, wherein ultrasonic fingerprint recognition circuit includes: lines recognition means Z, the
One resetting sub-circuit, acquisition sub-circuit, the first charging sub-circuit and reading sub-circuit；
In reset phase, the first resetting sub-circuit is configured to respond to the first weight of the first reset signal end Reset 1
Public voltage signal end Vcom is connected confidence number with first node A；In acquisition phase, acquires sub-circuit and be configured to respond to
Lines recognition means Z received signal is transferred to first node A by the first scanning signal of the first scanning signal end Scan 1, the
One charging sub-circuit is configured as the signal storage to first node A；In the stage of reading, reads sub-circuit and be configured as according to the
The current potential of the current potential of one node A and the first power end Vdd 1 reads the signal of the first charging sub-circuit storage.The signal is specific
It can be current value, current potential, the quantity of electric charge or other types of signal.
In the specific implementation, the first end of the first resetting sub-circuit and the first reset signal end Reset 1 are coupled, second end
It is coupled with public voltage signal end Vcom, third end and first node A are coupled；The first end and the first scanning for acquiring sub-circuit are believed
Number end Scan 1 is coupled, and second end and lines recognition means Z are coupled, and third end and first node A are coupled；First charging sub-circuit
One end and ground couple, the other end and first node A are coupled；The first end and first node A for reading sub-circuit couple, second end
It is coupled with the first power end Vdd 1, third end and reading signal wire ReadLine coupling.
Pixel circuit provided by the embodiments of the present application, comprising: be coupled to the pixel driver electricity of same first power end Vdd 1
Road and ultrasonic fingerprint recognition driving circuit, wherein ultrasonic fingerprint recognition circuit includes: lines recognition means, the first resetting son electricity
Road, acquisition sub-circuit, the first charging sub-circuit and reading sub-circuit, in reset phase, the first resetting sub-circuit is configured as
Public voltage signal end is connected with first node in response to first reset signal at the first reset signal end；In acquisition phase,
Acquisition sub-circuit is configured to respond to first scanning signal at the first scanning signal end for lines recognition means received signal
It is transferred to first node, the first charging sub-circuit is configured as the signal storage to first node；In the stage of reading, son electricity is read
Road is configured as the current potential of current potential and the first power end according to first node, reads the signal of the first charging sub-circuit storage,
That is, in the embodiment of the present application, ultrasonic fingerprint recognition driving circuit and pixel-driving circuit are connected to same first power end, into
When row lines identifies, ultrasonic fingerprint recognition driving circuit can be compatible with the coherent signal of pixel-driving circuit, drive fingerprint recognition
Dynamic circuit is integrated with pixel-driving circuit, realizes integrating for ultrasonic fingerprint recognition driving circuit and pixel-driving circuit.
In the specific implementation, display panel may include multiple lines recognition means, and each lines recognition means specifically may be used
To include the emission electrode being oppositely arranged and receiving electrode and the piezoelectric film between emission electrode and receiving electrode.
Wherein, when carrying out fingerprint recognition, ultrasonic signal emission is first carried out, that is, the receiving electrode Rx of all lines recognition means is loaded
(e.g., one fixed current potential (e.g., all adding 0 voltage), the emission electrode Tx of all lines recognition means load the voltage of alternation simultaneously
The voltage of positive and negative 5V), piezoelectric film can deformation occurs, and then generates sound wave, passes.When reception, all lines identifiers
The fixed current potential of emission electrode Tx load one of part, the receiving electrode Rx of all lines recognition means is received respectively handles digital reflex time
Ultrasonic signal, that is, when receive handle acoustic signals that digital reflex returns to piezoelectric film when, AC voltage can be converted into, reception
Electrode Rx can receive output signal.Since the paddy spinal reflex energy of finger is different, and then the signal being reflected back is different, realizes fingerprint
Detection.In the embodiment of the present application, acquisition sub-circuit by the signal that lines recognition means are got be transferred to first node it
Before, the emission electrode transmitting ultrasonic signal of lines recognition means can be first passed through, that is, specifically can be in reset phase and acquisition rank
Between section, alternating voltage signal is loaded by the emission electrode of lines recognition means.
In the specific implementation, shown in Figure 2, for the reading sub-circuit in the embodiment of the present application, specifically can wrap
Include: first switch transistor T1, the first source follow driving transistor Q1, rectifier diode S；Wherein, the first source follows driving brilliant
The grid and first node A of body pipe Q1 couples, and the first pole and the first power end Vdd 1 are coupled, the second pole and first switch crystal
The first pole of pipe T1 couples；The grid of first switch transistor T1 and the first signal control terminal EM 1 are coupled, the second pole and reading
Signal wire ReadLine coupling；One end of rectifier diode S and the first power end Vdd 1 are coupled, the other end and first node A coupling
It connects.In the embodiment of the present application, read sub-circuit specifically include first switch transistor T1, the first source follow driving transistor Q1 with
And rectifier diode S, and then can make to read sub-circuit under the control of the first signal control terminal EM 1, it realizes the first charging
The current potential of sub-circuit storage is read.Rectifier diode S can will reflect back into the square-wave signal (or sine wave) come and be cut
Take and accumulate, when first switch transistor T1 is opened, different read lines can read different current value or current potential or
Person's quantity of electric charge.
In the specific implementation, shown in Figure 2, the first resetting sub-circuit can specifically include: second switch transistor T2；
Wherein, the grid of second switch transistor T2 and the first reset signal end Reset 1 are coupled, the first pole and public voltage signal end
Vcom coupling, the second pole and first node A are coupled.In the embodiment of the present application, the first resetting sub-circuit includes second switch crystal
Pipe T2, and then the current potential of first node A can be reset according to the signal of the first reset signal end Reset 1, to avoid
When carrying out ultrasonic fingerprint recognition, when first node A retains other signals, interference is generated to fingerprint recognition.Wherein, common voltage
Signal end Vcom can be identical as the signal of the common voltage terminal of pixel-driving circuit, that is, ultrasonic fingerprint recognition driving circuit can
To be compatible with the public voltage signal of pixel-driving circuit.
In the specific implementation, shown in Figure 2, acquisition sub-circuit can specifically include: third switching transistor T3；Its
In, the grid of third switching transistor T3 and the first scanning signal end Scan 1 are coupled, the first pole and lines recognition means Z coupling
It connects, the second pole and first node A are coupled.In the embodiment of the present application, acquisition sub-circuit includes third switching transistor T3, Jin Erke
So that the lines recognition means Z signal received is transferred to first node according to the first scanning signal by acquisition sub-circuit.First
First scanning signal at scanning signal end, for opening sweeping for grid line line by line when can specifically be shown with pixel-driving circuit
It is identical to retouch signal, that is, ultrasonic fingerprint recognition driving circuit can also be compatible with the scanning signal of pixel-driving circuit.
In the specific implementation, shown in Figure 2, the first charging sub-circuit specifically includes: first capacitor device C1；Wherein,
One end and ground of one capacitor C1 couples, and the other end and first node A are coupled.In the embodiment of the present application, the first charging sub-circuit
Including first capacitor device C1, and then may be implemented to store the current potential of first node A.
In the specific implementation, shown in Figure 3 for the pixel-driving circuit in the embodiment of the present application, it specifically can be with
Include: the second resetting sub-circuit, charge control sub-circuit (can specifically include charge control sub-circuit 1 and charge control son
Circuit 2), the second source follow driving transistor Q2, the second charging sub-circuit, light emitting control sub-circuit (to can specifically include luminous
Control sub-circuit 1 and light emitting control sub-circuit 2) and luminescent device OLED；In reset phase, the second resetting sub-circuit is matched
Ground is connected the second reset signal being set in response to the second reset signal end Reset 2 with second node B；In acquisition phase,
Charge control sub-circuit is configured to respond to the second scanning signal of the second scanning signal end Scan 2 for data signal end
Vdate is connected with second node B, and the second charging sub-circuit is configured as the current potential storage to second node B；In light emitting phase,
Light emitting control sub-circuit is configured as the current potential of current potential and the first power end Vdd 1 according to second node B, the second source of control with
It shines with driving light emission drive transistor device.
Specifically, the first end of the second resetting sub-circuit and the second reset signal end Reset 2 are coupled, second end and ground coupling
It connects, third end and second node B are coupled；The first end of charge control sub-circuit and the second scanning signal end Scan 2 are coupled, the
Two ends and data signal end Vdate are coupled, and third end and second node B are coupled；Second source follows the grid of driving transistor Q2
Coupled with second node B, the first pole and third node C are coupled, and the second pole and fourth node D are coupled, third node C also with charging
Sub-circuit coupling is controlled, fourth node D is also coupled with light emitting control sub-circuit；One end of second charging sub-circuit and second source
Vdd2 coupling is held, the other end and second node B are coupled；The first end of light emitting control sub-circuit and the first power end Vdd 1 are coupled,
Second end and second node B are coupled, and third end and luminescent device OLED are coupled.
In the embodiment of the present application, pixel-driving circuit is with ultrasonic fingerprint recognition driving circuit in identical reset phase to phase
The node answered carries out current potential resetting, charges in identical acquisition phase to corresponding node, the second reset signal specifically may be used
With identical as the first reset signal, the second scanning signal specifically can be identical as the first scanning signal, realizes ultrasonic fingerprint recognition
The integration of the high added value function of driving circuit and pixel-driving circuit.
In the specific implementation, shown in Figure 4, the second resetting sub-circuit includes the 4th switching transistor T4；Wherein, the 4th
The grid of switching transistor T4 and the second reset signal end Reset 2 are coupled, and the first pole and ground couple, the second pole and second node
B coupling.In the embodiment of the present application, the second resetting sub-circuit includes the 4th switching transistor T4, is led in the 4th switching transistor T4
When logical, and then the resetting of the current potential to second node B may be implemented.
In the specific implementation, shown in Figure 4, charge control sub-circuit can specifically include: the 5th switching transistor T5,
6th switching transistor T6；The grid of 5th switching transistor T5 and the second scanning signal end Scan 2 are coupled, the first pole and number
It is coupled according to signal end Vdate, the second pole and third node C are coupled；The grid and third scanning signal of 6th switching transistor T6
Scan 3 is held to couple, the first pole and fourth node D are coupled, and the second pole and second node B are coupled, wherein third scanning signal end
The signal of Scan 3 is identical as the signal of the second scanning signal end Scan 2.In the embodiment of the present application, charge control sub-circuit packet
The 5th switching transistor T5 and the 6th switching transistor T6 is included, and then follows driving brilliant in the 5th switching transistor T5, the second source
When body pipe Q2, the 6th switching transistor T6 are connected, it may be implemented to be charged from data signal end Vdate to second node B.
In the specific implementation, shown in Figure 4, the second charging sub-circuit includes the second capacitor C2；Second capacitor C2
One end and second source end Vdd 2 couple, the other end and second node B are coupled.In the embodiment of the present application, the second charging son electricity
Road includes the second capacitor C2, and then may be implemented to store the current potential of second node B.
In the specific implementation, shown in Figure 4, light emitting control sub-circuit can specifically include: the 7th switching transistor T7,
8th switching transistor T8；The grid and second signal control terminal EM 2 of 7th switching transistor T7 couples, the first pole and first
Power end Vdd 1 is coupled, and the second pole and third node C are coupled；The grid and third signal control terminal of 8th switching transistor T8
EM 3 is coupled, and the first pole and fourth node D are coupled, and the second pole and luminescent device OLED are coupled, wherein third signal control terminal EM
3 signal is identical as the signal of second signal control terminal EM 2.In the embodiment of the present application, light emitting control sub-circuit is opened including the 7th
Transistor T7, the 8th switching transistor T8 are closed, in the 7th switching transistor T7, the 8th switching transistor T8 conducting, Ke Yigen
According to the current potential of the first power end Vdd 1 and second node B, driving transistor Q2 driving luminescent device OLED is followed by the second source
It shines.
The embodiment of the present application also provides a kind of display panel, including such as pixel circuit provided by the embodiments of the present application.
In the specific implementation, shown in Figure 5, lines recognition means Z is located at the gap location of adjacent luminescent device OLED, often
One lines recognition means Z includes the emission electrode 33 being oppositely arranged and receiving electrode 31 and is located at emission electrode 33 and receives
Piezoelectric film 32 between electrode 31, wherein receiving electrode 31 and 2 same layer of source-drain electrode are arranged, emission electrode 33 and grid (Fig. 5
In be not shown) same layer setting；Alternatively, receiving electrode 31 and grid same layer are arranged, emission electrode 33 and source-drain electrode same layer are arranged；Or
Person, receiving electrode 31 and one of source-drain electrode, grid same layer are arranged, and emission electrode 33 and 41 same layer of pixel electrode are arranged.This
Apply in embodiment, receiving electrode and grid same layer are arranged, and emission electrode and source-drain electrode same layer are arranged；Alternatively, receiving electrode with
The setting of source-drain electrode same layer, emission electrode and grid same layer are arranged；Alternatively, receiving electrode and one of source-drain electrode, grid same layer
Setting, emission electrode and pixel electrode same layer are arranged, and then can be while making thin film transistor (TFT) and pixel electrode, shape
At lines recognition means, and then it can simplify the manufacture craft for being integrated with the display panel of lines recognition means.
Referring to described in Fig. 6, the embodiment of the present application also provides a kind of driving such as pixel circuit provided by the embodiments of the present application
Method, comprising:
Step S101, reset phase loads the first reset signal to the first reset signal end, passes through the first resetting sub-circuit
Public voltage signal end is connected with first node.
Step S102, in acquisition phase, the first scanning signal is loaded to the first scanning signal end, it will by acquisition sub-circuit
Lines recognition means received signal is transferred to first node, is stored by signal of the first charging sub-circuit to first node.
Step S103, in the stage of reading, first control signal is loaded to first control signal end, by reading sub-circuit root
According to the current potential of first node and the current potential of the first power end, the signal of the first charging sub-circuit storage is read.
In the specific implementation, the driving method in the embodiment of the present application, further includes:
In reset phase, the second reset signal is loaded to the second reset signal end, resets sub-circuit for second by second
Node and ground are connected；
In acquisition phase, the second scanning signal is loaded to the second scanning signal end, by charge control sub-circuit by data
Signal end is connected with second node, is stored by current potential of the second charging sub-circuit to second node；
The second source is controlled by light emitting control sub-circuit according to second node, the current potential of the first power end in light emitting phase
Driving light emission drive transistor device is followed to shine.
In the specific implementation, data signal end is equal in the voltage that acquisition phase loads, and the first power end is in light emitting phase
The voltage of load and the second source follow the sum of the threshold voltage of driving transistor.In the embodiment of the present application, data signal end is being adopted
The collection stage voltage of load is equal to, and voltage and the second source that the first power end load in light emitting phase follow the threshold for driving transistor
The sum of threshold voltage, that is, charge control sub-circuit is V to the current potential that second node fills in acquisition phasedata+Vth, by the second source with
It is available with driving transistor Q2 saturation current formula:
I=K (VGS-Vth)2=K [(Vdata+Vth)-Vdd-Vth]2
=K (Vdd-Vdata)2
Operating current I by can see luminescent device at this time in above formula has not been followed driving transistor by the second source
Threshold voltage VthInfluence, only and VddAnd VdataIt is related.Thoroughly solve source follow driving transistor TFT due to manufacturing process and
Prolonged operation causes threshold voltage (Vth) drift the problem of, guarantee the accuracy of signal data.
Below for the clearer driving method for understanding pixel circuit provided by the embodiments of the present application, given below with Fig. 7
For signal timing diagram out, carried out in conjunction with driving method of Fig. 8-Figure 11 to the pixel-driving circuit of the embodiment of the present application detailed
It illustrates.
Shown in Figure 8 in reset phase, Reset 1, Reset 2 (the Reset signal i.e. in Fig. 8 right figure) are loaded
Low level signal, second switch transistor T2 are connected with the 4th switching transistor T4, and other transistors disconnect, common voltage letter
Number end Vcom be connected with first node A, and the potential of first node A is Vcom reference voltage, and second node B is grounded, and potential is
Vint.Second switch transistor T2 and the 4th switching transistor T4 are specifically as follows p-type switching transistor.
Shown in Figure 9 in acquisition phase, Scan 1, Scan 2, Scan 3 (the Scan signal i.e. in Fig. 9 right figure) are equal
Low level signal is loaded, other transistors of third switching transistor T3 conducting, ultrasonic fingerprint recognition driving circuit are closed, when super
Sound wave by finger reflect simultaneously be received electrode RX receive when, piezoelectric film PVDF can side generation induced electromotive force, first
The potential change of node A is the voltage after the reflection of ultrasonic wave finger, and the voltage is stored in the both ends C1, this stage is to generate to surpass
Sound wave feedback voltage, while preparing for next compensated stage.
Meanwhile for pixel-driving circuit, the 5th switching transistor T5, the second source follow driving transistor Q2 and the 6th
Switching transistor T6 conducting, other transistors disconnect, since second node B meets low potential Vint before, second source of stage
Driving transistor Q2 is followed to open, Vdata signal starts to charge to second node B by T5 → Q2 → T6, always by the
Until two node B are charged to Vdata+Vth (meeting the pressure difference between the two poles of the earth of M3 grid source is Vth), after charging finishes, second
The current potential of node B can maintain always Vdata+Vth.Third switching transistor T3 opens the light with the 5th switching transistor T5, the 6th
Transistor T6 is specifically as follows p-type switching transistor.
In the stage of reading, shown in Figure 10, the first signal control terminal EM 1 loads low level signal, first switch crystal
Pipe T1 conducting, the first source follow driving transistor Q1 conducting, read signal wire ReadLine can read different current value or
Person's current potential or the quantity of electric charge.The reason of stage and display stage distinguish is also to consider to distinguish with show-timezone, in this way
Signal interference is reduced, promotes signal-to-noise ratio (SNR) to greatest extent.
Shown in Figure 11 in light emitting phase, EM 2, EM 3 (that is, EM signal in Figure 11 right figure) load low level
Signal, the second source at this time follow the potential access Vdd 1 of the source electrode of driving transistor Q2, and electric current passes through T7 → Q2 → T8, by
Second source follows driving transistor Q2 saturation current formula available:
I=K (VGS-Vth)2=K [(Vdata+Vth)-Vdd-Vth]2
=K (Vdd-Vdata)2
Operating current I by can see luminescent device at this time in above formula has not been followed driving transistor by the second source
Threshold voltage VthInfluence, only and VddAnd VdataIt is related.Source follower TFT is thoroughly solved due to manufacturing process and prolonged
Operation causes threshold voltage (Vth) drift the problem of, guarantee signal data accuracy generate OLED current driving OLED device hair
Light.
The embodiment of the present application has the beneficial effect that: pixel circuit provided by the embodiments of the present application, comprising: is coupled to same
The pixel-driving circuit of one power end and ultrasonic fingerprint recognition driving circuit, wherein ultrasonic fingerprint recognition circuit includes: that lines is known
Other device, the first resetting sub-circuit, acquisition sub-circuit, the first charging sub-circuit and read sub-circuit, in reset phase, first
Resetting sub-circuit is configured to respond to first reset signal at the first reset signal end for public voltage signal end and first segment
Point conducting；In acquisition phase, acquires sub-circuit and be configured to respond to first scanning signal at the first scanning signal end for lines
Recognition means received signal is transferred to first node, and the first charging sub-circuit is configured as the signal storage to first node；
In the stage of reading, the current potential that sub-circuit is configured as current potential and the first power end according to first node is read, first is read and fills
The signal of electronic circuit storage, that is, in the embodiment of the present application, ultrasonic fingerprint recognition driving circuit is connected to pixel-driving circuit
Same first power end, when carrying out lines identification, ultrasonic fingerprint recognition driving circuit can be compatible with the phase of pixel-driving circuit
OFF signal integrates fingerprint recognition driving circuit with pixel-driving circuit, realizes ultrasonic fingerprint recognition driving circuit and picture
Plain driving circuit integrates.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (12)
1. a kind of pixel circuit characterized by comprising the pixel-driving circuit for being coupled to same first power end refers to ultrasound
Line identifies driving circuit, wherein the ultrasound fingerprint recognition circuit includes: lines recognition means, the first resetting sub-circuit, acquisition
Sub-circuit, the first charging sub-circuit and reading sub-circuit；
In reset phase, the first reset signal that the first resetting sub-circuit is configured to respond to the first reset signal end will
Public voltage signal end is connected with first node；
In acquisition phase, the first scanning signal that the acquisition sub-circuit is configured to respond to the first scanning signal end will be described
Lines recognition means received signal is transferred to the first node, and the first charging sub-circuit is configured as to described first
The signal of node stores；
In the stage of reading, the sub-circuit that reads is configured as according to the current potential of the first node and first power end
Current potential reads the signal of the first charging sub-circuit storage.
2. pixel circuit as described in claim 1, which is characterized in that
The first end of the first resetting sub-circuit and first reset signal end couple, and second end and the common voltage are believed
Number end coupling, third end and the first node couple；
The first end of the acquisition sub-circuit and first scanning signal end couple, second end and the lines recognition means coupling
It connects, third end and the first node couple；
One end and ground of the first charging sub-circuit couple, and the other end and the first node couple；
The first end for reading sub-circuit and the first node couple, and second end and first power end couple, third
End is coupled with signal wire is read.
3. pixel circuit as claimed in claim 2, which is characterized in that the reading sub-circuit include: first switch transistor,
First source follows driving transistor, rectifier diode；
First source follows the grid of driving transistor and the first node to couple, the first pole and the first power end coupling
It connects, the first pole of the second pole and the first switch transistor couples；
The grid of the first switch transistor and the first signal control terminal couple, and the second pole and the reading signal wire couple；
One end of the rectifier diode and first power end couple, and the other end and the first node couple.
4. pixel circuit as claimed in claim 2, which is characterized in that the first resetting sub-circuit includes: second switch crystalline substance
Body pipe；
The grid of the second switch transistor and first reset signal end couple, the first pole and the public voltage signal
End coupling, the second pole and the first node couple.
5. pixel circuit as claimed in claim 2, which is characterized in that the acquisition sub-circuit includes: third switching transistor；
The grid of the third switching transistor and first scanning signal end couple, the first pole and the lines recognition means
Coupling, the second pole and the first node couple.
6. pixel circuit as claimed in claim 2, which is characterized in that the first charging sub-circuit includes: first capacitor device；
One end and ground of the first capacitor device couple, and the other end and the first node couple.
7. pixel circuit as claimed in any one of claims 1 to 6, which is characterized in that the pixel-driving circuit includes: second
Resetting sub-circuit, charge control sub-circuit, the second source follow driving transistor, the second charging sub-circuit, light emitting control sub-circuit
And luminescent device；
In the reset phase, the second resetting sub-circuit is configured to respond to the second resetting letter at the second reset signal end
Number ground is connected with second node；In the acquisition phase, the charge control sub-circuit is configured to respond to the second scanning
Data signal end is connected second scanning signal of signal end with the second node, and the second charging sub-circuit is configured as
Current potential storage to the second node；In light emitting phase, the light emitting control sub-circuit is configured as according to second section
The current potential of point and the current potential of first power end control second source and follow luminescent device hair described in driving transistor driving
Light.
8. pixel circuit as claimed in claim 7, which is characterized in that
The first end of the second resetting sub-circuit and second reset signal end couple, and second end and ground couple, third end
It is coupled with the second node；
The first end of the charge control sub-circuit and second scanning signal end couple, second end and the data signal end
Coupling, third end and the second node couple；
Second source follows the grid of driving transistor and the second node to couple, and the first pole and third node couple, the
Two poles and fourth node couple, and the third node is also coupled with the charge control sub-circuit, the fourth node also with institute
State the coupling of light emitting control sub-circuit；
One end and second source end of the second charging sub-circuit couple, and the other end and the second node couple；
The first end of the light emitting control sub-circuit and first power end couple, and second end and the second node couple,
Third end and the luminescent device couple.
9. pixel circuit as claimed in claim 7, which is characterized in that second reset signal and first reset signal
It is identical；Second scanning signal is identical as first scanning signal.
10. a kind of display panel, which is characterized in that including such as described in any item pixel circuits of claim 1-9.
11. a kind of driving method of such as described in any item pixel circuits of claim 1-9 characterized by comprising
Reset phase loads the first reset signal to the first reset signal end, is believed common voltage by the first resetting sub-circuit
Number end is connected with first node；
In acquisition phase, the first scanning signal is loaded to the first scanning signal end, is identified the lines by acquisition sub-circuit
Device received signal is transferred to the first node, is deposited by the first charging sub-circuit to the voltage of the first node
Storage；
In the stage of reading, first control signal is loaded to first control signal end, by reading sub-circuit according to the first segment
The current potential of point and the current potential of the first power end read the current potential of the first charging sub-circuit storage.
12. driving method as claimed in claim 11, which is characterized in that further include:
In the reset phase, the second reset signal is loaded to the second reset signal end, resets sub-circuit for second by second
Node and ground are connected；
In the acquisition phase, the second scanning signal is loaded to the second scanning signal end, by charge control sub-circuit by data
Signal end is connected with the second node, is stored by current potential of the second charging sub-circuit to the second node；
In light emitting phase, by light emitting control sub-circuit according to the second node, the current potential of first power end, control the
Two sources follow driving light emission drive transistor device to shine.
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| CN201910244758.2A CN109872683B (en) | 2019-03-28 | 2019-03-28 | Pixel circuit, display panel and driving method |
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