CN110189698A - Pixel circuit and its driving method, display device - Google Patents
Pixel circuit and its driving method, display device Download PDFInfo
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- CN110189698A CN110189698A CN201910579057.4A CN201910579057A CN110189698A CN 110189698 A CN110189698 A CN 110189698A CN 201910579057 A CN201910579057 A CN 201910579057A CN 110189698 A CN110189698 A CN 110189698A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The disclosure is directed to a kind of pixel circuit and its driving method, display device, the pixel circuit includes: drive sub-circuits, data write-in sub-circuit, compensation sub-circuit, light emitting control sub-circuit, the first energy storage sub-circuit and the second energy storage sub-circuit；Drive sub-circuits are connected to the first power end, first node and second node；Sub-circuit is written for responding the first scanning signal and by data signal transmission to the first node in data；Compensation sub-circuit is used to that the first power supply signal to be transmitted to the first node in response to compensating control signal；Light emitting control sub-circuit is used to be transmitted to the signal of the second node in response to LED control signal the first end of the light-emitting component；First energy storage sub-circuit is connected between the first node and the second node；Second energy storage sub-circuit is connected between first power end and the second node.
Description
Technical field
This disclosure relates to which field of display technology, fills in particular to a kind of pixel circuit and its driving method, display
It sets.
Background technique
With the development of technology and progress, the use of OLED display are gradually extensive.OLED display usually passes through
It is luminous that pixel circuit drives light-emitting component to carry out, and pixel circuit generates driving current by driving transistor.
In display device manufacturing process, due to the influence of manufacturing technology and technique, all driving crystal are not can guarantee
The parameter of pipe is consistent, and then the technical parameter that will lead to different driving transistors is different, such as threshold voltage and mobility.By
In threshold voltage shift and the difference of mobility, so that the electric current of different crystal pipe is different, and then cause each light-emitting component bright
It spends inhomogenous, influences display effect.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
The disclosure is designed to provide a kind of pixel circuit and its driving method, display device, and then at least certain journey
It solves to lead to each light-emitting component brightness disproportionation one due to threshold voltage shift and the difference of mobility on degree, influences display effect
The problem of fruit.
According to the disclosure in a first aspect, providing a kind of pixel circuit, the pixel circuit includes:
Drive sub-circuits are connected to the first power end, first node and second node；
Sub-circuit is written in data, data signal end, the first scanning signal end and the first node is separately connected, for ringing
Answer the first scanning signal and by data signal transmission to the first node；
Sub-circuit is compensated, first power end, compensation control terminal and the first node is separately connected, is mended for responding
It repays control signal and the first power supply signal is transmitted to the first node；
Light emitting control sub-circuit is separately connected the first end of the second node, light emitting control end and light-emitting component, is used for
The signal of the second node is transmitted to the first end of the light-emitting component in response to LED control signal；
First energy storage sub-circuit, is connected between the first node and the second node；
Second energy storage sub-circuit is connected between first power end and the second node.
According to an embodiment of the disclosure, the pixel circuit further include:
Sub-circuit is initialized, initializing signal end, first scanning signal end and the light-emitting component are separately connected
Initializing signal is transmitted to the first end of the light-emitting component for responding first scanning signal by first end.
According to an embodiment of the disclosure, the drive sub-circuits include:
Transistor is driven, first end is connected to first power end, and second end is connected to the second node, control terminal
Connect the first node.
According to an embodiment of the disclosure, the data write-in sub-circuit includes:
The first transistor, first end are connected to the data signal end, and second end is connected to the first node, control terminal
It is connected to first scanning signal end, is connected for responding first scanning signal, by the data signal transmission
To the first node.
According to an embodiment of the disclosure, the compensation sub-circuit includes:
Second transistor, first end are connected to first power end, and second end is connected to the first node, control terminal
It is connected to the compensation control terminal, is connected for responding the compensating control signal, first power supply signal is transmitted
To the first node.
According to an embodiment of the disclosure, the light emitting control sub-circuit includes:
Third transistor, first end are connected to the second node, and second end is connected to the first end of the light-emitting component,
Control terminal connects the light emitting control end, is connected for responding the LED control signal, by the letter of the first node
Number it is transmitted to the first end of the light-emitting component.
According to an embodiment of the disclosure, the first energy storage sub-circuit includes:
First storage capacitor is connected between the first node and the second node；
The second energy storage sub-circuit includes:
Second storage capacitor is connected between first power end and the second node.
According to an embodiment of the disclosure, the initialization sub-circuit includes:
4th transistor, first end are connected to the initializing signal end, and second end is connected to the of the light-emitting component
One end, control terminal are connected to first scanning signal end, are connected for responding first scanning signal, will be described first
Beginningization signal is transmitted to the first end of the light-emitting component.
According to the second aspect of the disclosure, a kind of driving method of pixel circuit is provided for above-mentioned pixel circuit, institute
Stating driving method includes:
Using the first scanning signal, compensating control signal and LED control signal, data is connected, sub-circuit is written, shutdown is mended
Sub-circuit and light emitting control sub-circuit are repaid, so that the first energy storage sub-circuit is written in data-signal；
Using first scanning signal, the compensating control signal and the LED control signal, the data are turned off
Sub-circuit is written, the compensation sub-circuit is connected, turns off the light emitting control sub-circuit, with by first power supply signal and
The second energy storage sub-circuit compensates the drive sub-circuits；
Using first scanning signal, the compensating control signal and the LED control signal, the data are turned off
Sub-circuit and the compensation sub-circuit is written, the light emitting control sub-circuit is connected, to drive the light-emitting component to shine.
According to an embodiment of the disclosure, when the pixel circuit further includes initialization sub-circuit, the driving side
Method further include:
Using first scanning signal, the compensating control signal and the LED control signal, the data are connected
Sub-circuit, the initialization sub-circuit and the light emitting control sub-circuit is written, turns off the compensation sub-circuit, will initialize
Signal be transmitted to the light-emitting component first end and the second node.
According to the third aspect of the disclosure, a kind of display device is provided, the display device includes above-mentioned pixel circuit.
The pixel circuit that the disclosure provides mends drive sub-circuits by compensation sub-circuit and the second energy storage sub-circuit
It repays, eliminates influence of the threshold voltage shift to driving current, and solve driving current caused by transistor mobility difference
It is inconsistent and the problem of make light-emitting component brightness disproportionation one, promote display quality.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Detailed description of the invention
Its example embodiment is described in detail by referring to accompanying drawing, the above and other feature and advantage of the disclosure will become
It is more obvious.
Fig. 1 is a kind of circuit diagram for pixel circuit that disclosure exemplary embodiment provides；
Fig. 2 is the circuit diagram for another pixel circuit that disclosure exemplary embodiment provides；
Fig. 3 is a kind of driver' s timing figure for pixel circuit that disclosure exemplary embodiment provides；
Fig. 4 is a kind of flow chart of the driving method for pixel circuit that disclosure exemplary embodiment provides；
Fig. 5 is the flow chart of the driving method for another pixel circuit that disclosure exemplary embodiment provides.
In figure:
100, drive sub-circuits；200, sub-circuit is written in data；300, sub-circuit is compensated；400, light emitting control sub-circuit；
500, the first energy storage sub-circuit；600, the second energy storage sub-circuit；700, sub-circuit is initialized.
Vdd, the first power supply signal；Vss, second source signal；Vdata, data-signal；Sn, the first scanning signal；Bn,
Compensating control signal；EM, LED control signal；Vint, initializing signal；DT, driving transistor；T1, the first transistor；T2,
Second transistor；T3, third transistor；T4, the 4th transistor；C1, the first storage capacitor；C2, the second storage capacitor.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be real in a variety of forms
It applies, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will be comprehensively and complete
It is whole, and the design of example embodiment is comprehensively communicated to those skilled in the art.Identical appended drawing reference indicates in figure
Same or similar part, thus repetition thereof will be omitted.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner
In example.In the following description, many details are provided to provide and fully understand to embodiment of the disclosure.However,
It will be appreciated by persons skilled in the art that can be with technical solution of the disclosure without one in the specific detail or more
It is more, or can be using other methods, constituent element, material, device, step etc..In other cases, it is not shown in detail or describes
Known features, method, apparatus, realization, material or operation are to avoid fuzzy all aspects of this disclosure.
Block diagram shown in the drawings is only functional entity, not necessarily must be corresponding with physically separate entity.
I.e., it is possible to realize these functional entitys using software form, or these are realized in the module of one or more softwares hardening
A part of functional entity or functional entity, or realized in heterogeneous networks and/or processor device and/or microcontroller device
These functional entitys.
Disclosure exemplary embodiment provides a kind of pixel circuit first, as shown in Figure 1, the pixel circuit includes: to drive
Mover circuit 100, data write-in sub-circuit 200, compensation sub-circuit 300,400 first energy storage sub-circuit of light emitting control sub-circuit
500 and the second energy storage sub-circuit 600；Drive sub-circuits 100 are connected to the first power end, first node N1 and second node
N2；Data write-in sub-circuit 200 is separately connected data signal end, the first end scanning signal Sn and the first node N1, is used for
It responds the first scanning signal Sn and data-signal Vdata is transmitted to the first node N1；Compensation sub-circuit 300 is separately connected
First power end, the compensation control terminal and first node N1, in response to compensating control signal Bn and by the first power supply
Signal Vdd is transmitted to the first node N1；Light emitting control sub-circuit 400 is separately connected the second node N2, light emitting control
The first end at end and light-emitting component, for being transmitted to the signal of the second node N2 described in response to LED control signal EM
The second end of the first end of light-emitting component, light-emitting component connects second source signal Vss；First energy storage sub-circuit 500 is connected to
Between the first node N1 and the second node N2；Second energy storage sub-circuit 600 is connected to first power end and institute
It states between second node N2.
The pixel circuit that the embodiment of the present disclosure provides passes through compensation sub-circuit 300 and 600 pairs of the second energy storage sub-circuit drivings
Sub-circuit 100 compensates, on the one hand by the threshold voltage write-in energy storage son electricity of data voltage, the first supply voltage and transistor
Influence of the threshold voltage shift to driving current is eliminated on road；Another aspect is driven caused by solving transistor mobility difference
Streaming current is inconsistent and the problem of make light-emitting component brightness disproportionation one, promote display quality.
Further, the pixel circuit further includes initialization sub-circuit 700, and initialization sub-circuit 700 is separately connected just
Beginningization signal end, the end the first scanning signal Sn and the light-emitting component first end, for respond it is described first scanning letter
Number Sn and the first end that initializing signal Vint is transmitted to the light-emitting component.By initialization sub-circuit 700 to pixel electricity
Road is initialized, and prevents display device from phenomena such as image retention or smear occur.
Each synthesizer part of the pixel circuit provided the disclosure is described in detail below:
As shown in Fig. 2, the drive sub-circuits 100 include driving transistor DT, the first end connection of driving transistor DT
In first power end, the second end of transistor DT is driven to be connected to the second node N2, drives the control of transistor DT
End connects the first node N1.
The data write-in sub-circuit 200 includes the first transistor T1, and the first end of the first transistor T1 is connected to described
Data signal end, the second end of the first transistor T1 are connected to the first node N1, the control terminal connection of the first transistor T1
In the end the first scanning signal Sn, the first transistor T1, will be described for responding the first scanning signal Sn and being connected
Data-signal Vdata is transmitted to the first node N1.
The compensation sub-circuit 300 includes second transistor T2, and the first end of second transistor T2 is connected to described first
Power end, the second end of second transistor T2 are connected to the first node N1, and the control terminal of second transistor T2 is connected to institute
Compensation control terminal is stated, second transistor T2 believes first power supply for responding the compensating control signal Bn and being connected
Number Vdd is transmitted to the first node N1.
The light emitting control sub-circuit 400 includes third transistor T3, and the first end of third transistor T3 is connected to described
Second node N2, the second end of third transistor T3 are connected to the first end of the light-emitting component, the control of third transistor T3
End connects the light emitting control end, and third transistor T3 is for responding the LED control signal EM and being connected, by described the
The signal of one node N1 is transmitted to the first end of the light-emitting component.
The first energy storage sub-circuit 500 includes that the first storage capacitor C1, the first storage capacitor C1 is connected to described first
Between node N1 and the second node N2；The second energy storage sub-circuit 600 includes the second storage capacitor C2, the second energy storage electricity
Hold C2 to be connected between first power end and the second node N2.
The initialization sub-circuit 700 includes the 4th transistor T4, and the first end of the 4th transistor T4 is connected to described first
Beginningization signal end, the second end of the 4th transistor T4 are connected to the first end of the light-emitting component, the control of the 4th transistor T4
End is connected to the end the first scanning signal Sn, and the 4th transistor T4 is used to respond the first scanning signal Sn and be connected, with
The initializing signal Vint is transmitted to the first end of the light-emitting component.
Wherein, each transistor provided in the embodiment of the present disclosure all has a control terminal, first end and second end.Specifically
, it can be source electrode, second end can be drain electrode that the control terminal of each transistor, which can be grid, first end,；Alternatively, each crystalline substance
It can be drain electrode, second end can be source electrode that the control terminal of body pipe, which can be grid, first end,.In addition, each transistor may be used also
Think enhancement transistor or depletion mode transistor, this example embodiment is not especially limited this.
On this basis, all transistors can be N-type TFT, and the driving voltage of each transistor is high electricity
Ordinary telegram pressure；In the case, the first power supply signal Vdd can be high level signal, and the second source signal Vss can be with
For low level signal, the first end of the light-emitting component is the anode of OLED, and the second end of the luminous member is the cathode of OLED.
Alternatively, all transistors can be P-type TFT, the driving voltage of each transistor is low level electricity
Pressure；In the case, the first power supply signal Vdd can be low level signal, and the second source signal Vss can be height
Level signal, the first end of the light-emitting component are the cathode of OLED, and the second end of the light-emitting component is the anode of OLED.
It is described in detail below with reference to the course of work of the timing diagram shown in Fig. 3 to the pixel-driving circuit in Fig. 2.
By taking all transistors are N-type transistor as an example, the first power supply signal Vdd is high level signal, and second source signal Vss is low
Level signal；Wherein, light-emitting component is Organic Light Emitting Diode OLED, and the first end of light-emitting component is the anode of OLED, is shone
The second end of element is the cathode of OLED.
First period t1 (initial phase): LED control signal EM is high level, and the first scanning signal Sn is high level,
Compensating control signal Bn is low level, and the first transistor T1, third transistor T3, the 4th transistor T4 and driving transistor DT are led
It is logical, second transistor T2 shutdown, the voltage VN1 of first node N1, second node N2 voltage VN2, light-emitting component first end third
The voltage VN3 of node N3.Wherein, VN1=Vdata；VN2=VN3=Vint.
Second period t2 (data write phase): LED control signal EM is low level, and the first scanning signal Sn is high electricity
Flat, compensating control signal Bn is low level, and the first transistor T1, the 4th transistor T4 and driving transistor DT conducting, third are brilliant
Body pipe T3 and second transistor T2 shutdown, the voltage VN1 of first node N1, the N2 voltage VN2 of second node, light-emitting component first
Hold the voltage VN3 of third node N3.Wherein, VN1=Vdata；VN2=Vdata-Vth；VN3=Vint.
Third period t3 (compensated stage): LED control signal EM is low level, and the first scanning signal Sn is low level, is mended
Repaying control signal Bn is high level, second transistor T2 and driving transistor DT conducting, the first transistor T1, third transistor T3
It is turned off with the 4th transistor T4, the voltage VN2 of the voltage VN1 of first node N1, second node N2, light-emitting component first end third
The voltage VN3 of node N3.
Wherein, VN1=Vdd；VN3=Vint.
At this point,
Due to usual Vdd > Vdata, and Vgd < Vth at this time, therefore can consider driving transistor in compensated stage
DT charges to second node N2, and the charging time is determined by the rising edge of compensating control signal Bn and the relative time of failing edge
Fixed, i.e. the turn-on time of second transistor T2 determines, at the end of data are written:
Vg=Vdd；
Wherein, δ V (μn) it is the function that driving transistor DT charges to second node N2, δ V (μ n) is by second transistor T2
Turn-on time and driving transistor DT μ value determine.Second transistor T2 turn-on time includes the electricity of the first power supply signal Vdd
Hold coupling write time and δ V (μn) rise time, therefore δ V (μn) and μnIt is positively correlated.
4th period t4 (light emitting phase): LED control signal EM is high level, and the first scanning signal Sn is low level, is mended
Repaying control signal Bn is low level, third transistor T3 and driving transistor DT conducting, the first transistor T1, second transistor T2
It is turned off with the 4th transistor T4.Although second node N2 current potential will receive the influence of light-emitting component first end potential change at this time,
But first node N1 point is floating state, so the Vgs difference at this time based on second transistor T2 state is constant.
Therefore,
So corresponding OLED current are as follows:
Wherein, Vdd is the first power supply signal, and Vdata is data-signal, and Vth is driving transistor DT threshold voltage, Vint
For initializing signal, μnTo drive transistor DT mobility, COXIt is the insulation capacitor of unit area, W/L is driving transistor DT
Breadth length ratio, C1 be the first storage capacitor, C2 be the second storage capacitor, Vs be driving transistor DT source voltage；Vgs is driving
Transistor DT gate source voltage.
Due to COX, W/L is constant, therefore can enableK is a constant, is enabled
V (n) is determined under same data voltage and the first supply voltage.
Therefore IOLED=k μn[V(n)-δV(μn)]2。
As available from the above equation, due to δ V (μn) and μnIt is positively correlated, will lead to μ when driving transistor mobility lownIt is less than
Target value, still-δ V (μn) larger, it will lead to μ when driving transistor mobility highnGreater than target, still-δ V (μn)
It is smaller, so when IOLEDValue it is close with target current value, solve to a certain extent driving current it is inconsistent and make shine member
The problem of part brightness disproportionation one, promotes display quality.
It should be understood that all transistors are N-type transistor in above-mentioned specific embodiment；But this field skill
Art personnel are easy the pixel-driving circuit according to provided by the disclosure and obtain the pixel driver that all transistors are P-type transistor
Circuit.In a kind of illustrative embodiments of the disclosure, all transistors can be P-type transistor, at this time the first power supply
Signal Vdd is low level signal, and the cathode of OLED is connect with third transistor T3, and the anode of OLED is connect with high level signal.
It is had the advantage that using full P-type TFT for example strong to noise suppressed power；Such as due to being low level conducting, and fill
Low level is easy to accomplish in fulgurite reason；Such as P-type TFT processing procedure is simple, relative price is lower；Such as p-type film crystal
The stability of pipe is more preferable etc..Certainly, pixel-driving circuit provided by the disclosure is also readily modified as CMOS
(Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor) circuit etc., does not limit to
Provided pixel-driving circuit in this present embodiment, which is not described herein again.
It should be noted that although being referred to several sub-circuits of pixel circuit, this division in the above detailed description
It is not enforceable.In fact, according to embodiment of the present disclosure, the feature and function of two or more above-described sub-circuits
It can be embodied in a sub-circuit.Conversely, the feature and function of an above-described sub-circuit can further be drawn
It is divided by multiple sub-circuits and embodies.
The pixel circuit that the embodiment of the present disclosure provides passes through compensation sub-circuit 300 and 600 pairs of the second energy storage sub-circuit drivings
Sub-circuit 100 compensates, on the one hand by the threshold voltage write-in energy storage son electricity of data voltage, the first supply voltage and transistor
Influence of the threshold voltage shift to driving current is eliminated on road；Another aspect is driven caused by solving transistor mobility difference
Streaming current is inconsistent and the problem of make light-emitting component brightness disproportionation one, promote display quality.
Disclosure exemplary embodiment also provides a kind of driving method of pixel circuit, for above-mentioned pixel circuit, such as
Shown in Fig. 4, the driving method includes:
Step S510 is connected data and writes using the first scanning signal Sn, compensating control signal Bn and LED control signal EM
Enter sub-circuit 200, shutdown compensation sub-circuit 300 and light emitting control sub-circuit 400, so that the first storage of data-signal Vdata write-in
It can sub-circuit 500；
Step S520 utilizes the first scanning signal Sn, the compensating control signal Bn and the LED control signal
EM turns off the data write-in sub-circuit 200, the compensation sub-circuit 300 is connected, turns off the light emitting control sub-circuit 400,
To compensate the drive sub-circuits 100 by the first power supply signal Vdd and the second energy storage sub-circuit 600；
Step S530 utilizes the first scanning signal Sn, the compensating control signal Bn and the LED control signal
EM turns off the data write-in sub-circuit 200 and the compensation sub-circuit 300, the light emitting control sub-circuit 400 is connected, with
The light-emitting component is driven to shine.
The driving method for the pixel circuit that the embodiment of the present disclosure provides passes through compensation sub-circuit 300 and the second energy storage son electricity
Road 600 compensates drive sub-circuits 100, on the one hand by data voltage, the threshold voltage of the first supply voltage and transistor
Energy storage sub-circuit is written, eliminates influence of the threshold voltage shift to driving current；On the other hand transistor mobility is solved not
With caused by driving current it is inconsistent and the problem of make light-emitting component brightness disproportionation one, promote display quality.
Further, when the pixel circuit further includes initialization sub-circuit 700, as shown in figure 5, the driving method
Further include:
Step S540 utilizes the first scanning signal Sn, the compensating control signal Bn and the LED control signal
The data write-in sub-circuit 200, the initialization sub-circuit 700 and the light emitting control sub-circuit 400, shutdown is connected in EM
The compensation sub-circuit 300, by initializing signal Vint be transmitted to the light-emitting component first end and the second node
N2。
When the drive sub-circuits 100 include driving transistor DT, the data write-in sub-circuit 200 includes first crystal
Pipe T1, the compensation sub-circuit 300 include second transistor T2, and the light emitting control sub-circuit 400 includes third transistor T3,
The initialization sub-circuit 700 includes the 4th transistor T4, and the first energy storage sub-circuit 500 includes the first storage capacitor C1,
When the second energy storage sub-circuit 600 includes the second storage capacitor C2, by taking all transistors are N-type transistor as an example.
In step S540, LED control signal EM is high level, and the first scanning signal Sn is high level, compensation control letter
Number Bn is low level, and the first transistor T1, third transistor T3, the 4th transistor T4 and driving transistor DT conducting, second is brilliant
Body pipe T2 shutdown, the voltage VN1 of first node N1, second node N2 voltage VN2, the electricity of light-emitting component first end third node N3
Press VN3.Wherein, VN1=Vdata；VN2=VN3=Vint.
In step S510, LED control signal EM is low level, and the first scanning signal Sn is high level, compensation control letter
Number Bn is low level, and the first transistor T1, the 4th transistor T4 and driving transistor DT conducting, third transistor T3 and second are brilliant
Body pipe T2 shutdown, the voltage VN1 of first node N1, second node N2 voltage VN2, the electricity of light-emitting component first end third node N3
Press VN3.Wherein, VN1=Vdata；VN2=Vdata-Vth；VN3=Vint.
In step S520, LED control signal EM is low level, and the first scanning signal Sn is low level, compensation control letter
Number Bn is high level, second transistor T2 and driving transistor DT conducting, the first transistor T1, third transistor T3 and the 4th brilliant
Body pipe T4 shutdown, the voltage VN1 of first node N1, second node N2 voltage VN2, the electricity of light-emitting component first end third node N3
Press VN3.
Wherein, VN1=Vdd；VN3=Vint.
At this point,
Due to usual Vdd > Vdata, and Vgd < Vth at this time, therefore can consider driving transistor in compensated stage
DT charges to second node N2, and the charging time is determined by the rising edge of compensating control signal Bn and the relative time of failing edge
Fixed, i.e. the turn-on time of second transistor T2 determines, at the end of data are written:
Vg=Vdd；
Wherein, δ V (μn) it is the function that driving transistor DT charges to second node N2, δ V (μn) by second transistor T2's
The μ value of turn-on time and driving transistor DT determine.Second transistor T2 turn-on time includes the capacitor of the first power supply signal Vdd
Couple write time and δ V (μn) rise time, therefore δ V (μn) and μnIt is positively correlated.
In step S530, LED control signal EM is high level, and the first scanning signal Sn is low level, compensation control letter
Number Bn is low level, third transistor T3 and driving transistor DT conducting, the first transistor T1, second transistor T2 and the 4th brilliant
Body pipe T4 shutdown.Although second node N2 current potential will receive the influence of light-emitting component first end potential change at this time, first
Node N1 point is floating state, so the Vgs difference at this time based on second transistor T2 state is constant.
Therefore,
So corresponding OLED current are as follows:
Due to COX, W/L is constant, therefore can enableK is a constant, is enabledV (n) is determined under same data voltage and the first supply voltage.
Therefore IOLED=k μn[V(n)-δV(μn)]2。
As available from the above equation, due to δ V (μn) and μnIt is positively correlated, will lead to μ when driving transistor mobility lownIt is less than
Target value, still-δ V (μn) larger, it will lead to μ when driving transistor mobility highnGreater than target, still-δ V (μn)
It is smaller, so when IOLEDValue it is close with target current value, solve to a certain extent driving current it is inconsistent and make shine member
The problem of part brightness disproportionation one, promotes display quality.
Disclosure exemplary embodiment also provides a kind of display device, and the display device includes above-mentioned pixel circuit.
The display device includes: multi-strip scanning line, for providing the first scanning signal Sn；Multiple data lines, for providing data-signal
Vdata；A plurality of compensating control signal Bn line, for providing compensating control signal Bn；Multiple pixel-driving circuits, are electrically connected to
Scan line, data line and the compensating control signal Bn line stated；The pixel-driving circuit of at least one of them includes for this example reality
Apply any of the above-described pixel-driving circuit in mode.Pass through 600 pairs of driving son electricity of compensation sub-circuit 300 and the second energy storage sub-circuit
Road 100 compensates, and eliminates influence of the threshold voltage shift to driving current, and solves transistor mobility difference and cause
Driving current it is inconsistent and the problem of make light-emitting component brightness disproportionation one, promote display quality.Wherein, the display device example
It such as may include that mobile phone, tablet computer, television set, laptop, Digital Frame, navigator are any having a display function
Products or components.
It should be noted that although describing each step of method in the disclosure in the accompanying drawings with particular order,
This does not require that or implies must execute these steps in this particular order, or have to carry out step shown in whole
Just it is able to achieve desired result.Additional or alternative, it is convenient to omit multiple steps are merged into a step and held by certain steps
Row, and/or a step is decomposed into execution of multiple steps etc..
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
His embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Adaptive change follow the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure or
Conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by claim
It points out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the attached claims.
Claims (11)
1. a kind of pixel circuit, which is characterized in that the pixel circuit includes:
Drive sub-circuits are connected to the first power end, first node and second node；
Sub-circuit is written in data, is separately connected data signal end, the first scanning signal end and the first node, for responding the
Scan signal and by data signal transmission to the first node；
Sub-circuit is compensated, first power end, compensation control terminal and the first node are separately connected, for responding compensation control
Signal processed and the first power supply signal is transmitted to the first node；
Light emitting control sub-circuit is separately connected the first end of the second node, light emitting control end and light-emitting component, for responding
LED control signal and the first end that the signal of the second node is transmitted to the light-emitting component；
First energy storage sub-circuit, is connected between the first node and the second node；
Second energy storage sub-circuit is connected between first power end and the second node.
2. pixel circuit as described in claim 1, which is characterized in that the pixel circuit further include:
Sub-circuit is initialized, the first of initializing signal end, first scanning signal end and the light-emitting component is separately connected
Initializing signal is transmitted to the first end of the light-emitting component for responding first scanning signal by end.
3. pixel circuit as described in claim 1, which is characterized in that the drive sub-circuits include:
Transistor is driven, first end is connected to first power end, and second end is connected to the second node, control terminal connection
The first node.
4. pixel circuit as described in claim 1, which is characterized in that the data are written sub-circuit and include:
The first transistor, first end are connected to the data signal end, and second end is connected to the first node, control terminal connection
In first scanning signal end, be connected for responding first scanning signal, by the data signal transmission to institute
State first node.
5. pixel circuit as described in claim 1, which is characterized in that the compensation sub-circuit includes:
Second transistor, first end are connected to first power end, and second end is connected to the first node, control terminal connection
In the compensation control terminal, is connected for responding the compensating control signal, first power supply signal is transmitted to institute
State first node.
6. pixel circuit as described in claim 1, which is characterized in that the light emitting control sub-circuit includes:
Third transistor, first end are connected to the second node, and second end is connected to the first end of the light-emitting component, control
End connects the light emitting control end, is connected for responding the LED control signal, and the signal of the second node is passed
Transport to the first end of the light-emitting component.
7. pixel circuit as described in claim 1, which is characterized in that the first energy storage sub-circuit includes:
First storage capacitor is connected between the first node and the second node；
The second energy storage sub-circuit includes:
Second storage capacitor is connected between first power end and the second node.
8. pixel circuit as claimed in claim 2, which is characterized in that the initialization sub-circuit includes:
4th transistor, first end are connected to the initializing signal end, and second end is connected to the first end of the light-emitting component,
Control terminal is connected to first scanning signal end, is connected for responding first scanning signal, by the initialization
Signal is transmitted to the first end of the light-emitting component.
9. a kind of driving method of pixel circuit, which is characterized in that the described in any item pixel circuits of claim 1-8 are used for,
The driving method includes:
Using the first scanning signal, compensating control signal and LED control signal, data is connected, sub-circuit, shutdown compensation is written
Circuit and light emitting control sub-circuit, so that the first energy storage sub-circuit is written in data-signal；
Using first scanning signal, the compensating control signal and the LED control signal, the data write-in is turned off
The compensation sub-circuit is connected in sub-circuit, turns off the light emitting control sub-circuit, to pass through first power supply signal and described
Second energy storage sub-circuit compensates the drive sub-circuits；
Using first scanning signal, the compensating control signal and the LED control signal, the data write-in is turned off
Sub-circuit and the compensation sub-circuit, are connected the light emitting control sub-circuit, to drive the light-emitting component to shine.
10. driving method as claimed in claim 9, which is characterized in that when the pixel circuit further includes initialization sub-circuit
When, the driving method further include:
Using first scanning signal, the compensating control signal and the LED control signal, the data write-in is connected
Sub-circuit, the initialization sub-circuit and the light emitting control sub-circuit, turn off the compensation sub-circuit, by initializing signal
Be transmitted to the light-emitting component first end and the second node.
11. a kind of display device, which is characterized in that the display device includes the described in any item pixel electricity of claim 1-8
Road.
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