CN109801596A - A kind of pixel circuit, display panel and its driving method - Google Patents
A kind of pixel circuit, display panel and its driving method Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of pixel circuit, display panel and its driving method, is related to field of display technology, the uniformity of display panel brightness can be improved.A kind of pixel circuit, initialization are configured under the control of the signal at enable signal end with emission control circuit, the voltage at initial voltage end are written to the anode of light-emitting component, light-emitting component is made to be in reverse biased；Compensation circuit is configured under the control of the signal at the first scanning signal end, and the voltage at first voltage end is written to first node in compensated stage, and the grid for driving transistor is made extremely to be connected with second, carries out threshold voltage compensation to driving transistor；Write circuit is configured under the control of the signal at the second scanning signal end, and the voltage of data terminal is written to first node in data write phase；Drive circuitry arrangement is the grid for coupling first node to by the variation of compensated stage to data write phase in data write phase in driving transistor；And it shines in light emitting phase driving light-emitting component.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel circuits, display panel and its driving method.
Background technique
Organic electroluminescent LED (Organic Light Emitting Diode, OLED) display is to study at present
One of the hot spot in field is compared with liquid crystal display (Liquid Crystal Display, LCD), and OLED has low energy consumption, life
The advantages that producing at low cost, self-luminous, fast wide viewing angle and corresponding speed.Wherein, pixel circuit design is OLED display core skill
Art content has important research significance.
Different using stable voltage control brightness from LCD, OLED belongs to electric current driving, and stable electric current is needed to control
It shines.Due to manufacturing process and device aging etc., the threshold voltage vt h of the driving transistor of pixel circuit can be made to exist not
Uniformity, which results in the galvanoluminescence variations for flowing through each pixel OLED, so that display brightness is uneven, to influence
The display effect of whole image.
Summary of the invention
The embodiment of the present invention provides a kind of pixel circuit, display panel and its driving method, and display panel can be improved
The uniformity of brightness.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
On the one hand, a kind of pixel circuit is provided, comprising: initialization with emission control circuit, compensation circuit, driving circuit,
Write circuit and light-emitting component；Initialization and emission control circuit and enable signal end, initial voltage end, the light-emitting component and
The driving circuit is connected；The initialization is configured to the control in the signal at the enable signal end with emission control circuit
Under, the voltage at the initial voltage end is written to the anode of the light-emitting component, the light-emitting component is made to be in reverse biased
State；The driving circuit is connected with the light-emitting component in light emitting phase, and the initial voltage end is made to shine with described
The connection of element anode disconnects；The compensation circuit and the first scanning signal end, first voltage end, first node and the drive
The driving transistor of dynamic circuit is connected；The compensation circuit is configured to the control in the signal at first scanning signal end
Under, the voltage at the first voltage end is written to first node in compensated stage, and make it is described driving transistor grid with
Second is extremely connected, to carry out threshold voltage compensation to the driving transistor；First pole of the driving transistor and the second electricity
Pressure side electrical connection；Said write circuit is connected with the second scanning signal end, data terminal and the first node；Said write
Circuit configuration is that the voltage of data terminal is written in data write phase under the control of the signal at second scanning signal end
To the first node；The driving circuit is also connected with the first node；The drive circuitry arrangement is to write in data
Enter the stage by the first node by the variation of compensated stage to data write phase be coupled to it is described driving transistor grid；
And the light-emitting component is driven to shine in light emitting phase；The cathode of the light-emitting component is connected with tertiary voltage end.
Optionally, the initialization and emission control circuit include initialization sub-circuit and light emitting control sub-circuit；It is described
Initialization sub-circuit is connected with enable signal end, the initial voltage end and the light-emitting component；The initialization sub-circuit
It is configured under the control of the signal at the enable signal end, the light-emitting component is written into the voltage at the initial voltage end
Anode makes the light-emitting component be in reverse bias condition；And make the initial voltage end and the luminous member in light emitting phase
The connection of part anode disconnects.The light emitting control sub-circuit and enable signal end, the driving circuit and the light-emitting component phase
Connection；The light emitting control sub-circuit is configured under the control of the signal at the enable signal end, is made in light emitting phase described
Driving circuit is connected with the light-emitting component.
Optionally, the driving circuit further includes first capacitor in addition to including the driving transistor；The driving crystal
The grid of pipe is connected with the compensation circuit, and the first pole is connected with the second voltage end, the second pole and compensation electricity
Road is connected with the light emitting control sub-circuit；The first end of the first capacitor is connected with the first node, second end
It is connected with the grid of the driving transistor.
Further alternative, the driving circuit further includes the second capacitor；Described in the first end connection of second capacitor
Second voltage end, second end connect the first node.
Optionally, the initialization sub-circuit includes the first transistor；Make described in the grid connection of the first transistor
Energy signal end, the first pole connect the initial voltage end, and the second pole connects the anode of the light-emitting component.
Optionally, the light emitting control sub-circuit includes second transistor；Described in the grid connection of the second transistor
Enable signal end, the first pole connect the driving circuit, and the second pole connects the anode of the light-emitting component.
Optionally, the compensation circuit includes third transistor and the 4th transistor；The grid of the third transistor connects
First scanning signal end is connect, the first pole connects the first voltage end, and the second pole connects the first node；Described 4th
The grid of transistor connects first scanning signal end, and the first pole connects the second pole of the driving transistor, and the second pole connects
Connect the grid of the driving transistor.
Optionally, said write circuit includes the 5th transistor；The grid connection described second of 5th transistor is swept
Signal end is retouched, the first pole connects the data terminal, and the second pole connects the first node.
On the other hand, a kind of display panel, including viewing area are provided, the viewing area includes above-mentioned pixel circuit.
Another aspect provides a kind of driving method of above-mentioned display panel, comprising: in the initial phase of a frame, just
Beginningization and emission control circuit are written to light-emitting component under the control of the signal at enable signal end, by the voltage at initial voltage end
Anode, so that light-emitting component is in reverse bias condition；In the compensated stage of a frame, compensation circuit is at the first scanning signal end
Under the control of signal, the voltage at first voltage end is written to first node, and makes the grid and the second pole phase that drive transistor
Even, to carry out threshold voltage compensation to the driving transistor；In the data write phase of a frame, write circuit is in the second scanning
Under the control of the signal of signal end, the voltage of data terminal is written to the first node；Driving circuit is by first node by mending
The variation for repaying the stage to data write phase is coupled to the grid of the driving transistor；In the light emitting phase of a frame, initialization
With emission control circuit under the control of the signal at enable signal end, connect driving circuit with the light-emitting component, by driving
Light-emitting component described in circuit drives shines, and disconnects the connection of the initial voltage end and the emissive element anode.
Optionally, in the initial phase of a frame, the control of initialization and emission control circuit in the signal at enable signal end
Under system, the voltage at initial voltage end is written to the anode of light-emitting component, light-emitting component is made to be in reverse bias condition, comprising:
In the initial phase of a frame, sub-circuit is initialized under the control of the signal at enable signal end, by the voltage at initial voltage end
It is written to the anode of light-emitting component, light-emitting component is made to be in reverse bias condition.In the light emitting phase of a frame, initializes and shine
Control circuit connects driving circuit with the light-emitting component, is driven by driving circuit under the control of the signal at enable signal end
It moves the light-emitting component to shine, and disconnects the connection of the initial voltage end and the emissive element anode, comprising: in a frame
Light emitting phase, light emitting control sub-circuit makes driving circuit and the light-emitting component under the control of the signal at enable signal end
Connection, drives the light-emitting component to shine by driving circuit；And initializing sub-circuit makes the initial voltage end and the hair
The connection of optical element anode disconnects.
The embodiment of the present invention provides a kind of pixel circuit, display panel and its driving method, initialization and light emitting control electricity
The stage in addition to light emitting phase of Lu Yi frame is written to the anode of light-emitting component by the voltage for exporting initial voltage end,
Light-emitting component can be made to be in reverse bias condition, to effectively prevent to show in process caused by long-term positive bias in light-emitting component
Space charge accumulation in light-emitting component organic layer prevents light-emitting component performance degradation.On this basis, compensation circuit is by mending
Voltage write-in first node of the stage by first voltage end is repaid, and the grid for driving transistor is made extremely to be connected with second, to driving
Transistor carries out threshold voltage compensation, and driving circuit can be made when driving light-emitting component to carry out luminous, flow through the electricity of light-emitting component
Stream is unrelated with the driving threshold voltage of transistor, to eliminate influence of the threshold voltage to light emission luminance, improves display surface
The uniformity of plate brightness.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention；
Fig. 3 a is a kind of concrete structure schematic diagram of the modules of pixel circuit shown in Fig. 2；
Fig. 3 b is a kind of concrete structure schematic diagram of the modules of pixel circuit shown in Fig. 2；
The timing diagram for each signal that Fig. 4 is used when being for driving pixel circuit shown in Fig. 3 b；
Fig. 5 a- Fig. 5 d is equivalent circuit diagram when pixel circuit shown in Fig. 3 b corresponds to different situations；
Fig. 6 is a kind of driving method flow diagram for driving display panel provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of pixel circuit, as shown in Figure 1, comprising: initialization with emission control circuit 10,
Compensation circuit 20, driving circuit 30, write circuit 40 and light-emitting component L.
Initialization and emission control circuit 10 and enable signal end EM, initial voltage end Vin, light-emitting component L and the driving
Circuit 30 is connected；Initialization is configured under the control of the signal of enable signal end EM with emission control circuit 10, will be initial
Voltage end VinVoltage be written to the anode of light-emitting component L, so that light-emitting component L is in reverse bias condition；Make in light emitting phase
Driving circuit 30 is connected with light-emitting component L, and makes initial voltage end VinConnection with light-emitting component L anode disconnects.
The drive of compensation circuit 20 and the first scanning signal end S1, first voltage end V1, first node A and driving circuit 30
Dynamic transistor Td is connected；Compensation circuit 20 is configured under the control of the signal of the first scanning signal end S1, in compensated stage
The voltage of first voltage end V1 is written to first node A, and the grid for driving transistor S1 is made extremely to be connected with second, to drive
Dynamic transistor Td carries out threshold voltage compensation；Wherein, the first pole of transistor Td is driven to be electrically connected with second voltage end V2.
Write circuit 40 and the second scanning signal end S2, data terminal VdataAnd first node A is connected；Write circuit 40
It is configured under the control of the signal of the second scanning signal end S2, in data write phase by data terminal VdataVoltage be written to
First node A.
Driving circuit 30 is also connected with first node A；Driving circuit 30 is configured to first segment in data write phase
Point A is coupled to the grid of driving transistor Td by the variation of compensated stage to data write phase；And it drives and sends out in light emitting phase
Optical element L shines.
The cathode of light-emitting component L is connected with tertiary voltage end V3.In some embodiments, light-emitting component L is OLED member
Part.
First voltage end V1 and second voltage end V2 can be high level, and the two voltage can be equal, can also be unequal.
Tertiary voltage end V3 is low level."high" herein, " low " only indicate the relative size relationship between the voltage of input.Third electricity
Pressure side V3 can also be grounded.
The embodiment of the present invention provides a kind of pixel circuit, and initialization removes light emitting phase in a frame with emission control circuit 10
Except stage by by initial voltage end VinThe voltage of output is written to the anode of light-emitting component L, and light-emitting component L can be made to be in
Reverse bias condition, to effectively prevent to show light-emitting component L organic layer caused by long-term positive bias in process in light-emitting component L
Interior space charge accumulation prevents light-emitting component L performance degradation.On this basis, compensation circuit 20 by compensated stage by
First node is written in the voltage of one voltage end V1, and the grid for driving transistor Td is made extremely to be connected with second, to driving transistor
Td carries out threshold voltage compensation, and driving circuit 30 can be made when driving light-emitting component L to carry out luminous, flow through the electricity of light-emitting component L
Stream is unrelated with the driving threshold voltage of transistor Td, to eliminate influence of the threshold voltage to light emission luminance, improves display
The uniformity of panel luminance.
Optionally, as shown in Fig. 2, initialization includes initialization sub-circuit 101 and light emitting control with emission control circuit 10
Sub-circuit 102.
Initialize sub-circuit 101 and enable signal end EM, initial voltage end VinIt is connected with light-emitting component L；Initial beggar
Circuit 101 is configured under the control of the signal of enable signal end EM, by initial voltage end VinVoltage write-in light-emitting component L
Anode makes light-emitting component L be in reverse bias condition；And make the initial voltage end V in light emitting phaseinWith the light-emitting component
The connection of L anode disconnects.
It is understood that initializing sub-circuit 101 in other stages for removing light emitting phase, all by initial voltage end Vin's
The anode of light-emitting component L is written in voltage, and light-emitting component L is made to be in reverse bias condition.
Light emitting control sub-circuit 102 is connected with enable signal end EM, driving circuit 30 and light-emitting component L；Light emitting control
Sub-circuit 102 is configured under the control of the signal of enable signal end EM, makes driving circuit 30 and light-emitting component L in light emitting phase
Connection.
Optionally, as shown in Figure 3a, driving circuit 30 further includes first capacitor C1 in addition to including driving transistor Td.
The grid of driving transistor Td is connected with compensation circuit 20, and the first pole is connected with second voltage end V2, and second
Pole is connected with compensation circuit 20 and light emitting control sub-circuit 102.
The first end of first capacitor C1 is connected with first node A, and second end is connected with the grid of driving transistor Td.
It should be noted that driving circuit 30 can also include multiple driving transistor Td in parallel, and/or in parallel multiple
First capacitor C1.Above-mentioned is only to driving circuit 30 for example, other structures identical with 30 function of driving circuit
This is no longer going to repeat them, but protection scope of the present invention all should belong to.
Optionally, as shown in Figure 3b, driving circuit 30 further includes the second capacitor C2.
The first end of second capacitor C2 connects second voltage end V2, and second end connects first node A.
Since the first end of the second capacitor C2 is connected with second voltage end V2, and the fixed electricity of second voltage end V2 output
Pressure, therefore, when the second terminal potential of the second capacitor C2, that is, the voltage jump that the current potential of first node A is inputted by compensated stage to
After the voltage of data write phase, the after the jump voltage of maintenance that the second capacitor C2 can make first node A stable.
It is understood that can be improved applied by the pixel circuit when driving circuit 30 does not include the second capacitor C2
The aperture opening ratio of display panel.
Optionally, as best shown in figures 3 a and 3b, initialization sub-circuit 101 includes the first transistor T1.
The grid of the first transistor T1 connects enable signal end EM, and the first pole connects initial voltage end Vin, the connection of the second pole
The anode of light-emitting component L.
It should be noted that initialization sub-circuit 101 can also include that the multiple switch in parallel with the first transistor T1 is brilliant
Body pipe.Above-mentioned is only to initialization sub-circuit 101 for example, other knots identical with initialization 101 function of sub-circuit
This is no longer going to repeat them for structure, but protection scope of the present invention all should belong to.
Optionally, as best shown in figures 3 a and 3b, light emitting control sub-circuit 102 includes second transistor T2.
The grid of second transistor T2 connects enable signal end EM, and the first pole connects driving circuit 30, the second pole connection hair
The anode of optical element L.
When driving circuit 30 is above structure, the first pole of second transistor T2 and the second pole phase of driving transistor Td
Connection.
As shown in Figure 3a and Figure 3b shows, since the initial phase and light emitting phase of the pixel circuit course of work are two ranks
Section, thus, under the control of the signal of enable signal end EM output, it should ensure that initialization sub-circuit 101 is opened in initial phase
It opens, corresponding light emitting control sub-circuit 102 is closed, and light emitting control sub-circuit 102 is opened in light emitting phase, initializes sub-circuit
101 close.
Based on this, the transistor (the first transistor T1 as escribed above) and light emitting control that sub-circuit 101 includes are initialized
The type for the transistor (second transistor T2 as escribed above) that sub-circuit 102 includes is different.
It should be noted that light emitting control sub-circuit 102 can also include the multiple switch in parallel with second transistor T2
Transistor.Above-mentioned is only to light emitting control sub-circuit 102 for example, other and 102 function phase of light emitting control sub-circuit
This is no longer going to repeat them for same structure, but protection scope of the present invention all should belong to.
Optionally, as best shown in figures 3 a and 3b, compensation circuit 20 includes third transistor T3 and the 4th transistor T4.
The grid of third transistor T3 connects the first scanning signal end S1, and the first pole connects first voltage end V1, the second pole
Connect first node A.
The grid of 4th transistor T4 connects the first scanning signal end S1, and the connection of the first pole drives the second of transistor Td
Pole, the grid of the second pole connection driving transistor Td.
First voltage end V1 is used to charge to first capacitor C1, and only dynamic power consumption does not have quiescent dissipation, and only first
Constantly for low level, first voltage end V1 just charges to first capacitor C1 scanning signal end S1, and second voltage end V2 needs to tie up
Hold OLED light it is luminous, thus, first voltage end V1 compared to second voltage end V2 power consumption it is lower, resistance drop (IR drop) effect
It should be also minimum.
It should be noted that compensation circuit 20 can also include the multiple switch transistor in parallel with third transistor T3,
And/or the multiple switch transistor in parallel with the 4th transistor T4.It is above-mentioned be only to compensation circuit 20 for example, its
This is no longer going to repeat them for his structure identical with 20 function of compensation circuit, but protection scope of the present invention all should belong to.
Optionally, as best shown in figures 3 a and 3b, write circuit 40 includes the 5th transistor T5.
The grid of 5th transistor T5 connects the second scanning signal end S2, and the first pole connects data terminal Vdata, the second pole connects
Meet first node A.
It should be noted that write circuit 40 can also include the multiple switch transistor in parallel with the 5th transistor T5.
Above-mentioned is only to write circuit 40 for example, other structures identical with 40 function of write circuit are no longer gone to live in the household of one's in-laws on getting married one by one herein
It states, but protection scope of the present invention all should belong to.
The first pole of above-mentioned the first transistor T1 to the 5th transistor T5 can be drain electrode, the second pole can be source electrode, or
Person, first can extremely make source electrode, the second pole can be drain electrode, the invention is not limited in this regard.
In addition, the above-mentioned transistor in pixel circuit can be divided into enhanced according to the difference of transistor conductivity mode
Transistor and depletion mode transistor, this is not limited by the present invention.
Based on the above-mentioned description to physical circuit, below in conjunction with Fig. 4 and Fig. 3 b specifically driving to above-mentioned pixel circuit
Journey is described in detail.
Second transistor T2, third transistor T3, the 4th transistor T4, the 5th transistor T5 are P-type transistor, and first
Transistor T1 is N-type transistor, and driving transistor Td is P-type transistor.
As shown in figure 4, the pixel circuit each frame show process can be divided into initial phase P1, compensated stage P2,
Data write phase P3 and light emitting phase P4.
Initial phase P1, enable signal end EM input high level signal, the scanning letter of the first scanning signal end S1 and second
Number end S2 all input high level signal.Based on this, the equivalent circuit diagram of pixel circuit shown in Fig. 3 b is as shown in Figure 5 a.First is brilliant
Body pipe T1 conducting, second transistor T2, third transistor T3, the 4th transistor T4 and the 5th transistor T5 cut-off.
The conducting of the first transistor T1, so that initial voltage end VinVoltage be written to the anode of light-emitting component L, due to first
Beginning voltage end VinVoltage (be denoted as V less than the voltage of tertiary voltage end V3dd3), i.e. Vin<Vdd3, so that the cathode potential of OLED
Higher than anode potential, OLED is in reverse bias condition, the space charge accumulation of OLED device organic layer is prevented, to restore
The feature of OLED.
Compensated stage P2, enable signal end EM input high level signal, the first scanning signal end S1 input low level signal,
Second scanning signal end S2 input high level signal.Based on this, the equivalent circuit diagram of pixel circuit shown in Fig. 3 b such as Fig. 5 b institute
Show.The first transistor T1, third transistor T3, the 4th transistor T4 conducting, second transistor T2 and the 5th transistor T5 are cut
Only.
The voltage of first voltage end V1 (is denoted as V by the conducting of third transistor T3dd1) it is written to first node A, first
The voltage of node A is VA=Vdd1。
The conducting of 4th transistor T4 drives transistor Td so that the second pole of driving transistor Td is electrically connected with grid
The first pole be electrically connected with second voltage end V2 so that the voltage of second voltage end V2 (is denoted as Vdd2) it is written to driving crystalline substance
The first pole of body pipe Td, conducting driving transistor Td to driving transistor Td grid (that is, second node B in Fig. 3 b) into
Row charging.When driving the gate source voltage (i.e. grid and the first electrode potential is poor) of transistor Td to be its threshold voltage, crystal is driven
Pipe Td no longer meets opening condition, is in close state, and the second of driving transistor Td extremely terminates the charging process of grid.This
When, Vg-Vs=- | Vth |, Vs=Vdd2, that is, the voltage Vg=V of the grid of driving transistor Tddd2-|Vth|.That is, the first electricity
The voltage for holding the second end of C1 is Vdd2-|Vth|。
Write phase P3, enable signal end EM input high level signal, the first scanning signal end S1 input high level signal,
Second scanning signal end S2 input low level signal.Based on this, the equivalent circuit diagram of pixel circuit shown in Fig. 3 b such as Fig. 5 c institute
Show.The first transistor T1, the 5th transistor T5 conducting, second transistor T2, third transistor T3 and the 4th transistor T4 are cut
Only.
The conducting of 5th transistor T5, by data terminal VdataData voltage be written to first node A, first node A's
Voltage is by V on last stagedd1Jump is Vdata, variable quantity Vdata-Vdd1, and second node B is in floating, according to electricity
Hold the constant characteristic of the voltage difference at both ends, it is known that, it is V in the first end voltage variety of first capacitor C1data-Vdd1The case where
Under, second end can also change accordingly, and the voltage of second node B is coupled as Vdd2-|Vth|+Vdata-Vdd1。
In addition, in initial phase P1, compensated stage P2 and write phase P3, since second transistor T2 is in cut-off shape
State, therefore, light-emitting component L remain turned-off.
Light emitting phase P4, enable signal end EM input low level signal, the first scanning signal end S1 and the second scanning signal
Hold S2 input high level signal.Based on this, the equivalent circuit diagram of pixel circuit shown in Fig. 3 b is as fig 5d.Second transistor
T2 conducting, the first transistor T1, third transistor T3, the 4th transistor T4 and the 5th transistor T5 cut-off.
Due to the effect of first capacitor C1, the voltage of second node B keeps V on last stagedd2-|Vth|+Vdata-Vdd1,
And driving the first electrode potential of transistor Td is Vdd2, therefore driving the gate source voltage of transistor Td is Vgs=Vdd2-|Vth|+
Vdata-Vdd1-Vdd2=-| Vth |+Vdata-Vdd1.Due to VdataVoltage be lower than Vdd1, there is Vgs=- | Vth |+Vdata-Vdd1<-|
Vth |, therefore transistor Td is driven to open, in saturation open state.Then flow through the electric current Is of driving transistor Td are as follows:
Is=1/2 × K × [Vgs- (- ︱ Vth ︱)]2
=1/2 × K × [Vdata- ︱ Vth ︱-Vdd1(- ︱ Vth ︱)]2
=1/2 × K × (Vdata–Vdd1)2
Wherein, K=W/L × C × u, W/L are the breadth length ratio for driving transistor Td, and C is driving transistor Td unit area
Channel capacitance, u are the carrier mobility for driving transistor Td channel.
It follows that flowing through the electric current and data voltage end V of driving transistor TddataThere is provided for realizing display
The voltage V of data voltage and first voltage end V1dd1It is related, flow through the electric current of driving transistor Td and the threshold of driving transistor Td
The voltage of threshold voltage and second voltage end V2 are unrelated.To, on the one hand, eliminate the threshold voltage vt h of driving transistor Td
Influence to light-emitting component L light emission luminance improves the homogeneity of light-emitting component L brightness, on the other hand, first voltage end V1 phase
Power consumption than second voltage end V2 is lower, and resistance voltage drop effect is also minimum, preferably maintains the stabilization of OLED current.
The embodiment of the present invention also provides a kind of display panel, including several sub-pixels, and each sub-pixel includes above-mentioned
It anticipates a kind of pixel circuit.
Display panel provided in an embodiment of the present invention has identical with the pixel circuit that present invention provides
Beneficial effect, details are not described herein again.
The embodiment of the present invention also provides a kind of driving method of display panel, for driving above-mentioned display panel, such as Fig. 6
Shown, which includes:
S10, in the initial phase of a frame, the control of initialization and emission control circuit 10 in the signal of enable signal end EM
Under system, by initial voltage end VinVoltage be written to the anode of light-emitting component L, so that light-emitting component L is in reverse bias condition.
S20, in the compensated stage of a frame, compensation circuit 20 is under the control of the signal of the first scanning signal end S1, by
One voltage end VinVoltage be written to first node A, and make drive transistor Td grid be extremely connected with second, with to drive crystalline substance
Body pipe Td carries out threshold voltage compensation.
S30, the data write phase in a frame, write circuit 40 under the control of the signal of the second scanning signal end S2,
By data terminal VdataVoltage be written to the first node A；Driving circuit 30 is write first node A by compensated stage to data
The variation for entering the stage is coupled to the grid of the driving transistor Td.
S40, in the light emitting phase of a frame, the control of initialization and emission control circuit 10 in the signal of enable signal end EM
Under, it connects driving circuit 30 with the light-emitting component L, drives the light-emitting component L to shine by driving circuit 30, and make initial
Voltage end VinConnection with light-emitting component L anode disconnects.
The embodiment of the present invention provides a kind of driving method of display panel, and initialization is with emission control circuit 10 in a frame
Stage in addition to light emitting phase is by by initial voltage end VinThe voltage of output is written to the anode of light-emitting component L, can make to send out
Optical element L is in reverse bias condition, shines caused by long-term positive bias to effectively prevent to show in light-emitting component L in process
Space charge accumulation in element L organic layer prevents light-emitting component L performance degradation.On this basis, compensation circuit 20 is by mending
Voltage write-in first node A of the stage by first voltage end V1 is repaid, and the grid for driving transistor Td is made extremely to be connected with second, it is right
It drives transistor Td to carry out threshold voltage compensation, driving circuit 30 can be made when driving light-emitting component L to carry out luminous, flowed through luminous
The electric current of element L is unrelated with the driving threshold voltage of transistor Td, to eliminate influence of the threshold voltage to light emission luminance, mentions
The high uniformity of display panel brightness.
It optionally, include initialization sub-circuit 101 and light emitting control son electricity in above-mentioned initialization and emission control circuit 10
S10 in the case where road 102, in above-mentioned driving method, comprising:
In the initial phase P1 of a frame, sub-circuit 101 is initialized under the control of the signal of enable signal end EM, it will be first
Beginning voltage end VinVoltage be written to the anode of light-emitting component L, so that light-emitting component L is in reverse bias condition.
S40 in above-mentioned driving method, comprising:
In the light emitting phase P4 of a frame, light emitting control sub-circuit 102 makes to drive under the control of the signal of enable signal end EM
Dynamic circuit 30 is connected with light-emitting component L, drives light-emitting component L to shine by driving circuit 30；And initializing sub-circuit 101 makes institute
State initial voltage end VinConnection with the light-emitting component L anode disconnects.
It include that driving transistor Td, first capacitor C1 or driving circuit 30 include driving transistor in driving circuit 30
Td, first capacitor C1 and the second capacitor C2, initialization sub-circuit 101 include the first transistor T1, and compensation circuit 20 includes third
Transistor T3 and the 4th transistor T4, write circuit 40 include the 5th transistor T5, and light emitting control sub-circuit 102 includes second brilliant
In the case where body pipe T2, driving method is same as described above, and details are not described herein.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (11)
1. a kind of pixel circuit characterized by comprising initialization with emission control circuit, compensation circuit, driving circuit, write
Enter circuit and light-emitting component；
Initialization and emission control circuit and enable signal end, initial voltage end, the light-emitting component and the driving circuit phase
Connection；The initialization is configured under the control of the signal at the enable signal end with emission control circuit, will be described initial
The voltage of voltage end is written to the anode of the light-emitting component, and the light-emitting component is made to be in reverse bias condition；In luminous rank
Section connects the driving circuit with the light-emitting component, and makes the connection at the initial voltage end and the emissive element anode
It disconnects；
The compensation circuit and the driving of the first scanning signal end, first voltage end, first node and the driving circuit are brilliant
Body pipe is connected；The compensation circuit is configured under the control of the signal at first scanning signal end, is incited somebody to action in compensated stage
The voltage at the first voltage end is written to first node, and the grid of the driving transistor is made extremely to be connected with second, with right
The driving transistor carries out threshold voltage compensation；First pole of the driving transistor is electrically connected with second voltage end；
Said write circuit is connected with the second scanning signal end, data terminal and the first node；Said write circuit is matched
It is set under the control of the signal at second scanning signal end, is written to the voltage of data terminal in data write phase described
First node；
The driving circuit is also connected with the first node；The drive circuitry arrangement in data write phase by institute
State the grid that first node is coupled to the driving transistor by the variation of compensated stage to data write phase；And in luminous rank
Section drives the light-emitting component to shine；
The cathode of the light-emitting component is connected with tertiary voltage end.
2. pixel circuit according to claim 1, which is characterized in that the initialization includes initial with emission control circuit
Beggar's circuit and light emitting control sub-circuit；
The initialization sub-circuit is connected with enable signal end, the initial voltage end and the light-emitting component；It is described initial
Beggar's circuit configuration is that the hair is written in the voltage at the initial voltage end under the control of the signal at the enable signal end
The anode of optical element makes the light-emitting component be in reverse bias condition；And make the initial voltage end and institute in light emitting phase
The connection for stating emissive element anode disconnects；
The light emitting control sub-circuit is connected with enable signal end, the driving circuit and the light-emitting component；It is described to shine
Control sub-circuit is configured under the control of the signal at the enable signal end, makes the driving circuit and described in light emitting phase
Light-emitting component connection.
3. pixel circuit according to claim 2, which is characterized in that it includes the driving transistor that the driving circuit, which removes,
It outside, further include first capacitor；
The grid of the driving transistor is connected with the compensation circuit, and the first pole is connected with the second voltage end, the
Two poles are connected with the compensation circuit and the light emitting control sub-circuit；
The first end of the first capacitor is connected with the first node, and second end is connected with the grid of the driving transistor
It connects.
4. pixel circuit according to claim 2, which is characterized in that the driving circuit further includes the second capacitor；
The first end of second capacitor connects the second voltage end, and second end connects the first node.
5. pixel circuit according to claim 2, which is characterized in that the initialization sub-circuit includes the first transistor；
The grid of the first transistor connects the enable signal end, and the first pole connects the initial voltage end, and the second pole connects
Connect the anode of the light-emitting component.
6. pixel circuit according to claim 2, which is characterized in that the light emitting control sub-circuit includes the second crystal
Pipe；
The grid of the second transistor connects the enable signal end, and the first pole connects the driving circuit, the connection of the second pole
The anode of the light-emitting component.
7. pixel circuit according to claim 1 or 2, which is characterized in that the compensation circuit include third transistor and
4th transistor；
Grid connection first scanning signal end of the third transistor, the first pole connection first voltage end, second
Pole connects the first node；
The grid of 4th transistor connects first scanning signal end, and the first pole connects the second of the driving transistor
Pole, the second pole connect the grid of the driving transistor.
8. pixel circuit according to claim 1 or 2, which is characterized in that said write circuit includes the 5th transistor；
The grid of 5th transistor connects second scanning signal end, and the first pole connects the data terminal, and the second pole connects
Connect the first node.
9. a kind of display panel, including viewing area, which is characterized in that the viewing area includes described in claim any one of 1-8
Pixel circuit.
10. a kind of driving method of display panel described in claim 9 characterized by comprising
In the initial phase of a frame, initialization and emission control circuit, will be initial under the control of the signal at enable signal end
The voltage of voltage end is written to the anode of light-emitting component, and light-emitting component is made to be in reverse bias condition；
In the compensated stage of a frame, compensation circuit is under the control of the signal at the first scanning signal end, by the electricity at first voltage end
Pressure is written to first node, and the grid for driving transistor is made extremely to be connected with second, to carry out threshold value to the driving transistor
Voltage compensation；
In the data write phase of a frame, write circuit is under the control of the signal at the second scanning signal end, by the electricity of data terminal
Pressure is written to the first node；Driving circuit couples institute by the variation of compensated stage to data write phase for first node
State the grid of driving transistor；
In the light emitting phase of a frame, initialization and emission control circuit make driving electricity under the control of the signal at enable signal end
Road is connected with the light-emitting component, drives the light-emitting component to shine by driving circuit, and make the initial voltage end with it is described
The connection of emissive element anode disconnects.
11. driving method according to claim 10, which is characterized in that
In the initial phase of a frame, initialization and emission control circuit, will be initial under the control of the signal at enable signal end
The voltage of voltage end is written to the anode of light-emitting component, and light-emitting component is made to be in reverse bias condition, comprising:
In the initial phase of a frame, sub-circuit is initialized under the control of the signal at enable signal end, by initial voltage end
Voltage is written to the anode of light-emitting component, and light-emitting component is made to be in reverse bias condition；
In the light emitting phase of a frame, initialization and emission control circuit make driving electricity under the control of the signal at enable signal end
Road is connected with the light-emitting component, drives the light-emitting component to shine by driving circuit, and make the initial voltage end with it is described
The connection of emissive element anode disconnects, comprising:
In the light emitting phase of a frame, light emitting control sub-circuit makes driving circuit and institute under the control of the signal at enable signal end
Light-emitting component connection is stated, drives the light-emitting component to shine by driving circuit；And initializing sub-circuit makes the initial voltage
End and the connection of the emissive element anode disconnect.
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| CN201910101494.5A CN109801596A (en) | 2019-01-31 | 2019-01-31 | A kind of pixel circuit, display panel and its driving method |
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| CN201910101494.5A CN109801596A (en) | 2019-01-31 | 2019-01-31 | A kind of pixel circuit, display panel and its driving method |
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| CN201910101494.5A Pending CN109801596A (en) | 2019-01-31 | 2019-01-31 | A kind of pixel circuit, display panel and its driving method |
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| CN111105749A (en) * | 2020-01-15 | 2020-05-05 | 京东方科技集团股份有限公司 | Pixel circuit, pixel driving method and display device |
| CN111696486A (en) * | 2020-07-14 | 2020-09-22 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof, display substrate and display device |
| CN112382237A (en) * | 2020-11-27 | 2021-02-19 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display substrate and display device |
| CN112992075A (en) * | 2021-03-01 | 2021-06-18 | 锐芯微电子股份有限公司 | Pixel driving circuit, pixel driving method, pixel structure and display device |
| CN113112959A (en) * | 2021-04-08 | 2021-07-13 | 京东方科技集团股份有限公司 | Pixel circuit, display panel, display device and driving method of pixel circuit |
| CN113571000A (en) * | 2021-08-06 | 2021-10-29 | 厦门天马微电子有限公司 | Display panel and display device |
| WO2022011777A1 (en) * | 2020-07-14 | 2022-01-20 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit and display device |
| WO2022078076A1 (en) * | 2020-10-12 | 2022-04-21 | Oppo广东移动通信有限公司 | Pixel driving circuit and method, and display device |
| WO2022188427A1 (en) * | 2021-03-09 | 2022-09-15 | 京东方科技集团股份有限公司 | Display substrate and driving method therefor, and display device |
| CN115171608A (en) * | 2022-09-08 | 2022-10-11 | 惠科股份有限公司 | Driving circuit, driving method and display panel |
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| CN111105749A (en) * | 2020-01-15 | 2020-05-05 | 京东方科技集团股份有限公司 | Pixel circuit, pixel driving method and display device |
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| CN112382237A (en) * | 2020-11-27 | 2021-02-19 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display substrate and display device |
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| WO2022257284A1 (en) * | 2021-06-09 | 2022-12-15 | 上海闻泰信息技术有限公司 | Gate circuit and optical sensor circuit |
| CN113571000A (en) * | 2021-08-06 | 2021-10-29 | 厦门天马微电子有限公司 | Display panel and display device |
| CN113571000B (en) * | 2021-08-06 | 2024-03-01 | 厦门天马微电子有限公司 | Display panel and display device |
| CN115171608A (en) * | 2022-09-08 | 2022-10-11 | 惠科股份有限公司 | Driving circuit, driving method and display panel |
| WO2024051204A1 (en) * | 2022-09-08 | 2024-03-14 | 惠科股份有限公司 | Driving circuit, driving method, and display panel |
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