CN104715712B - A kind of pixel circuit and its driving method and application - Google Patents
A kind of pixel circuit and its driving method and application Download PDFInfo
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Abstract
A kind of pixel circuit and its driving method of the present invention are electrically connected with the first capacitor between the anode of Organic Light Emitting Diode and the grid of the driving transistor；When responding same data-signal, the carrier mobility of the driving transistor of each pixel circuit differs each pixel circuit, and the electric current for flowing through Organic Light Emitting Diode is caused to be not quite similar, and influences the uniformity of each pixel unit luminosity；Voltage change is fed back to the grid of driving transistor by the first capacitor in parallel with driving transistor, since all transistors are the identical field-effect tube of raceway groove polarity, it can play the role of the electric current that negative-feedback regu- lation flows into Organic Light Emitting Diode anode, so as to which the current compensation that Organic Light Emitting Diode is flowed through in each pixel is consistent, effectively solve the problems, such as due to the uneven display effect so as to influence using its organic light-emitting display device of Organic Light Emitting Diode caused by the difference of carrier mobility.
Description
Technical field
The present invention relates to display technology fields, and in particular to one kind can effectively improve display device response characteristic and show
The pixel circuit and its driving method of uniform pixel qualities and the display device of the application pixel circuit.
Background technology
Flat-panel monitor has the characteristics that fully planarize, light, thin, power saving, is the inexorable trend of image display development
And research focus.In various types of panel display apparatus, due to active array organic light emitting display device（English full name is
Active Matrix Organic Light Emitting Display, abbreviation AMOLED）Use self luminous organic light emission
Diode（English full name is Organic Light Emitting Diode, abbreviation OLED）Image is shown, when there is response
Between it is short, be driven using low-power consumption, the characteristic of relatively better brightness and colour purity, so organic light-emitting display device is
Through the focus for becoming next generation display device.
For large-scale active array organic light emitting display device, including be located at scan line and data cable intersection region it is more
A pixel unit.Each pixel unit includes Organic Light Emitting Diode and for driving the pixel of the Organic Light Emitting Diode electric
Road, pixel circuit then further comprise switching transistor, the components such as driving transistor and storage.
Difference and switch between the pixel characteristic of active array organic light emitting display device transistor easily driven is brilliant
The influence of the unfavorable factors such as the leakage current of body pipe, thus the quality uniformity of the image of active array organic light emitting display device and
Uniformity is difficult to be guaranteed, in particular with the continuous increase of active matrix panel display apparatus size, pixel unit quantity
Increase, this problem becomes especially prominent.
As shown in Figure 1, traditional active array organic light emitting display device generally includes scan line Sn1, data cable Dm, electricity
Source line ELVDD and ELVSS and it is connected to these lines and the pixel unit being arranged in matrix.Each pixel unit is usual
It is used to keep the capacitor of data voltage including an Organic Light Emitting Diode OLED, two thin film transistor (TFT)s and one；Its
In a thin film transistor (TFT) be for transmitting the switching transistor T2 of data-signal, one is for being had according to data-signal driving
The driving transistor T3 of machine light emitting diode OLED.
Although the display device of conventional active matrix/organic light emitting described in Fig. 1 has the advantages that low-power consumption, due to film
The reason in the preparation process of transistor, it is difficult to which so that all thin film transistor (TFT)s have in active array organic light emitting display device
The carrier mobility of driving transistor is different in identical carrier mobility, particularly different pixels unit so that is adding
When entering identical gate drive voltage, it is inconsistent to flow through the electric current of Organic Light Emitting Diode, causes organic hair in different pixels unit
The brightness of optical diode is inconsistent；Each pixel unit generates the light with different brightness, seriously when responding same data-signal
Influence the display effect of active array organic light emitting display device.
The content of the invention
For this purpose, it is to be solved by this invention be different pixels unit pixel circuit in driving transistor carrier mobility
Rate is not quite similar, easily influence display effect the technical issues of, a kind of pixel circuit that can compensate different pixels unit is provided
Driving method and the application of the pixel circuit and the pixel circuit of middle driving transistor carrier mobility differential.
In order to solve the above technical problems, the technical solution adopted by the present invention is as follows：
A kind of pixel circuit of the present invention, be electrically connected by data cable with data driver, by scan line with sweeping
Driver electrical connection is retouched, each pixel circuit further comprises the first power supply, second source, is sequentially connected in the first power supply and the
Driving transistor and Organic Light Emitting Diode between two power supplys, each pixel circuit further include：
First capacitor, be connected electrically in the Organic Light Emitting Diode anode and the driving transistor grid it
Between.
Each pixel circuit further includes：
The first transistor is connected electrically between the 7th transistor and first capacitor, the grid of the first transistor
Pole is electrically connected to three scan line；
7th transistor is connected electrically between the first transistor and the 3rd power supply, the grid of the 7th transistor
It is electrically connected to the three scan line;
3rd power supply is adjusted generation, the 3rd power supply and the driving transistor grid by external drive circuit in real time
Voltage absolute value of the difference between pole is equal to the absolute of the voltage difference between first power supply and the driving transistor grid
It is worth equal.
First power supply is high level voltage source, and the second source is low level voltage source.
Each pixel circuit further includes：
Second transistor is connected electrically between data cable and driving transistor, and the grid of the second transistor is electrically connected
It is connected to the second scan line;
4th transistor is connected electrically between the first transistor and the 8th transistor, the grid of the 4th transistor
Pole is electrically connected to the second scan line；
8th transistor is connected electrically between the 4th transistor and the driving transistor.
Each pixel circuit further includes：
5th transistor is connected electrically between the first power supply and the driving transistor, the grid of the 5th transistor
It is electrically connected to the first scan line;
6th transistor is connected electrically between the driving transistor and the anode of Organic Light Emitting Diode, and the described 6th
The grid of transistor is electrically connected to first scan line.
The source electrode of 4th transistor be electrically connected to the driving transistor grid and first capacitor with
The pole plate of the first transistor electrical connection.
The second capacitor, and second capacitor are also electrically connected between first power supply and first capacitor
The pole plate being electrically connected with first capacitor is also electrically connected to the grid of the driving transistor.
All transistors are the identical field-effect tube of raceway groove polarity.
A kind of driving method of pixel circuit of the present invention, the scan period of every row pixel unit is divided into
Initial phase, programming phases and glow phase, include the following steps：
S1, in the initial phase, scanner driver exports low level scanning signal to three scan line, conducting first
Transistor and the 7th transistor so that the voltage of the 3rd power supply is supplied to driving transistor as resetting voltage；
S2, in the programming phases, the scanner driver exports low level scanning signal to the second scan line, conducting the
Two-transistor, the 4th transistor and the 8th transistor, since the driving transistor is initialised in the initial phase, institute
With driving transistor forward conduction, charge to the first capacitor；
S3, in the glow phase, the scanner driver exports low level scanning signal to the first scan line, conducting the
Five transistors and the 6th transistor, driving current is along the first power supply through the 5th transistor, the driving transistor, described
Six transistors and Organic Light Emitting Diode flow to second source, current line pixel unit luminescence display image.
3rd power supply is adjusted generation, the 3rd power supply and the driving transistor grid by external drive circuit in real time
Voltage absolute value of the difference between pole is equal to the absolute of the voltage difference between first power supply and the driving transistor grid
It is worth equal.
First power supply is high level voltage source, and the second source is low level voltage source.
In step S2, also charge after the driving transistor forward conduction to the second capacitor.
A kind of active array organic light emitting display device of the present invention, including the pixel circuit.
The above technical solution of the present invention has the following advantages over the prior art：
1st, a kind of pixel circuit and its driving method of the present invention, anode and the drive in Organic Light Emitting Diode
The first capacitor is electrically connected between the grid of dynamic transistor；Each pixel circuit is when responding same data-signal, if each pixel
The carrier mobility of the driving transistor of circuit differs, and the electric current for flowing through Organic Light Emitting Diode is caused to be not quite similar, this
When so that the voltage loaded in Organic Light Emitting Diode anode is also different；Pass through first electricity in parallel with driving transistor
Voltage change is fed back to the grid of driving transistor by container, since all transistors are the identical field-effect tube of raceway groove polarity,
When the gate drive voltage increase of driving transistor, the voltage difference between source-drain electrode reduces so that flows into organic light-emitting diodes
The electric current of tube anode reduces, when the gate drive voltage of driving transistor is reduced, the voltage difference increase between source-drain electrode so that
Flowing into the electric current of Organic Light Emitting Diode anode increases, so as to which the electric current that Organic Light Emitting Diode is flowed through in each pixel unit be mended
It repays unanimously, effectively solve influences display since oled luminance caused by the difference of carrier mobility is uneven imitates
The problem of fruit.
2nd, a kind of pixel circuit and its driving method of the present invention, due to the driving transistor threshold of different pixels circuit
Threshold voltage is not quite similar, and causes the electric current for flowing into Organic Light Emitting Diode inconsistent so that current each pixel unit luminosity
Uniformity be deteriorated, picture quality is uneven；The pixel circuit has threshold voltage compensation transistor（4th transistor and
Eight transistors）, threshold voltage compensation transistor stores the information of threshold voltage to the first capacitor, for compensating driving crystal
The threshold voltage variation of pipe, so as to improve the light characteristic of current pixel unit, so that display device is shown with equilibrium
The image of picture quality.
3rd, a kind of pixel circuit and its driving method of the present invention, due to the leakage of the 4th transistor and the 8th transistor
Electric current so that the gate drive voltage loaded in driving transistor grid changes in the voltage of the glow phase of each frame,
So that the bad stability of pixel unit brightness, serious so as to cause image flicker；The pixel circuit has leakage compensated
Transistor（The first transistor and the 7th transistor）, leakage compensated transistor be used for the pixel light emission stage compensate due to threshold value
Voltage compensated crystal pipe（4th transistor and the 8th transistor）Leakage current cause driving transistor grid voltage variation,
So as to improve the blinking characteristic of pixel unit, so that display device shows the image with low flicker picture quality.
4th, a kind of active array organic light emitting display device of the present invention, all transistors are ditch in pixel circuit
Polarity identical field-effect tube in road is electrically connected between the anode of Organic Light Emitting Diode and the grid of the driving transistor
First capacitor；For each pixel circuit when responding same data-signal, first capacitor in parallel with driving transistor is by voltage
Variation feeds back to the grid of driving transistor, so as to flow through the current compensation one of Organic Light Emitting Diode in each pixel unit
It causes, effectively solves to influence asking for display effect since Organic Light Emitting Diode caused by the difference of carrier mobility is uneven
Topic；The pixel circuit also has threshold voltage compensation transistor（4th transistor and the 8th transistor）, threshold voltage compensation
Transistor stores the information of threshold voltage to the first capacitor, for the threshold voltage variation of compensation for drive transistor, thus
Improve the light characteristic of current pixel unit, so that display device shows the image with balanced picture quality；The picture
Plain circuit has leakage compensated transistor（The first transistor and the 7th transistor）, leakage compensated transistor is in pixel
Glow phase is compensated since the leakage current of threshold voltage compensation transistor causes the variation of the grid voltage of driving transistor, so as to
The blinking characteristic of pixel unit can be improved, so that display device shows the image with low flicker picture quality.In addition, by
The leakage current of driving transistor grid is reduced in the pixel circuit, it is thereby possible to reduce storage capacitance in pixel circuit
Capacitance, so as to reduce capacity area so that the space of a whole page area of pixel circuit reduces, and can realize and improve the active square
The purpose of battle array organic light-emitting display device resolution ratio.
Description of the drawings
In order to make the content of the present invention more clearly understood, below according to specific embodiments of the present invention and combine
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the pixel circuit figure of conventional active matrix/organic light emitting display device in the prior art；
Fig. 2 is pixel circuit figure described in the embodiment of the present invention 1；
Fig. 3 is pixel circuit figure described in the embodiment of the present invention 2；
Fig. 4 is the oscillogram for driving the method for pixel circuit in Fig. 2 and Fig. 3；
Fig. 5 is the structural map of active array organic light emitting display device described in the embodiment of the present invention 3.
Reference numeral is expressed as in figure：T1- the first transistors, T2- second transistors, T3- driving transistors, T4- the 4th
Transistor, the 5th transistors of T5-, the 6th transistors of T6-, the 7th transistors of T7-, the 8th transistors of T8-, N1- first nodes,
N2- section points, the 3rd nodes of N3-, the first capacitors of C1-, the second capacitors of C2-, COLEDThe parasitism of-Organic Light Emitting Diode
Capacitance, Dm- m column data lines, Sn- line ns scan line, the first scan line of Sn1- line ns, the second scan line of Sn2- line ns,
Sn3- line ns three scan line, the 4th scan line of Sn4- line ns, OLED- Organic Light Emitting Diodes, the first power supplys of ELVDD-,
ELVSS-second source, the 3rd power supplys of ELVL-, t1- initial phases, t2- programming phases, t3- glow phases, 110- pixel lists
Member, 120- scanner drivers, 130- data drivers.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Certain exemplary embodiments according to the present invention are described referring to the drawings.Here, it is described as when by first element
When ' attach ' to second element, first element can be directly connected to second element or by between one or more add ons
Second element is connected in succession.Further, for the sake of clarity, be concisely omitted be not for fully understanding the present invention must
Some elements of palpus.In addition, identical reference numeral refers to identical element always.
Embodiment 1
The present embodiment provides a kind of pixel circuit and its driving method, as shown in figure 5, the pixel circuit passes through data cable
Dm is electrically connected with data driver 130, is electrically connected by scan line Sni (i 1,2,3) with scanner driver 120；Each pixel
Unit 110 is initialised in the initial phase t1 of the scan line Sni scan control signals provided, programming phases t2 receive from
The data model that data cable Dm is provided is shown in glow phase t3 by emitting the light with brightness corresponding with data-signal
Image；Suitable level is transitted to after scan control signal is provided in glow phase t3, scan line Sni, so as to each
The Organic Light Emitting Diode set in pixel unit 110 provides electric current.
As shown in Fig. 2, each pixel circuit further comprises the first power supply ELVDD and second source of external access
ELVSS, the first power supply ELVDD and second source ELVSS are used as the driving power of pixel circuit, and the pixel circuit further includes suitable
The secondary driving transistor T3 being connected between the first power supply ELVDD and second source ELVSS and Organic Light Emitting Diode OLED.
External 3 scan lines of pixel circuit：First scan line Sn1, the second scan line Sn2, three scan line Sn3；
The external 1 data line Dm of pixel circuit.
The pixel circuit further includes：
First be connected electrically between the grid of the Organic Light Emitting Diode OLED anodes and the driving transistor T3
Capacitor C1；The first transistor T1 being connected electrically between the 7th transistor T7 and the first capacitor C1, described first is brilliant
The grid of body pipe T1 is electrically connected to three scan line Sn3；Second be connected electrically between data cable Dm and driving transistor T3
The grid of transistor T2, the second transistor T2 are electrically connected to the second scan line Sn2;It is connected electrically in the first transistor T1
And the 8th the 4th transistor T4 between transistor T8, the grid of the 4th transistor T4 are electrically connected to the second scan line Sn2；
The 5th transistor T5 being connected electrically between the first power supply ELVDD and the driving transistor T3, the 5th transistor T5's
Grid is electrically connected to the first scan line Sn1;It is connected electrically in the anode of the driving transistor T3 and Organic Light Emitting Diode OLED
Between the 6th transistor T6, the grid of the 6th transistor T6 is electrically connected to the first scan line Sn1；It is connected electrically in institute
The 7th transistor T7 between the first transistor T1 and the 3rd power supply ELVL is stated, the grid of the 7th transistor T7 is electrically connected to
The three scan line Sn3;The 8th transistor being connected electrically between the 4th transistor T4 and the driving transistor T3
T8。
Wherein, first node N1 is electrically connected drain electrode and the 8th crystal of the source electrode, the 5th transistor T5 of driving transistor T3
The source electrode of pipe T8；
The drain electrode of the grid, the 4th transistor T4 of section point N2 electrical connection driving transistors T3 and the first capacitor C1
The pole plate being electrically connected with the first transistor T1；
3rd node N3 is electrically connected the drain electrode of the 6th transistor T6, the anode and the first capacitance of Organic Light Emitting Diode OLED
Pole plates of the device C1 away from the first transistor T1；
Fourth node N4 is electrically connected the drain electrode of second transistor T2, the drain electrode of driving transistor T3 and the 6th transistor T6's
Source electrode.
In Fig. 2, COLEDFor the parasitic capacitance of Organic Light Emitting Diode.
First power supply ELVDD is high level voltage source, and second source ELVSS is low level voltage source；3rd power supply ELVL
Adjust generation in real time by external drive circuit so that the voltage absolute value of the difference of the 3rd power supply ELVL and section point N2 are equal to the
Voltage absolute value of the difference between one power supply ELVDD and section point N2 is equal.I.e. described 3rd power supply ELVL and the driving
Voltage absolute value of the difference between transistor T3 grids be equal to the first power supply ELVDD and the driving transistor T3 grids it
Between voltage absolute value of the difference it is equal.
Fig. 4 shows the oscillogram of the method for pixel circuit in driving Fig. 2, for the ease of showing, will be shown in FIG. 4 one
The drive signal of pixel circuit is supplied to during frame, the scan period of every row pixel unit 110 is divided into initial phase t1, is compiled
Journey（programming）Stage t2 and glow phase t3.
In the initial phase t1, scanner driver 120 exports low level scanning signal to three scan line Sn3, leads
Logical the first transistor T1 and the 7th transistor T7 so that the voltage of the 3rd power supply ELVL is supplied to section point as resetting voltage
N2；The first transistor T1 and the 7th transistor T7 is provided during the initialization time section of pixel unit 110 to section point N2
Constant voltage.
In the present embodiment, resetting voltage is arranged to the 3rd power supply ELVL, so as to which section point N2 can quilt in each frame
Consistently it is reset to the 3rd power supply ELVL.
In the programming phases t2, scanner driver 120 exports low level scanning signal to the second scan line Sn2, and second
Transistor T2 is connected between the drain electrode of data cable Dm and third transistor T3, and the grid of second transistor T2 is connected to scan line
Sn2, second transistor T2 are turned on, so as to which the data-signal provided from data cable Dm is supplied to pixel unit 110.
Third transistor T3 is connected between first node N1 and the 6th transistor T6, the grid connection of third transistor T3
To section point N2, third transistor T3 controls flow to the amplitude of the driving current of Organic Light Emitting Diode OLED.
4th transistor T4 is connected between the source electrode of the 8th transistor T8 and section point N2, the grid of the 4th transistor T4
Pole is connected to scan line Sn2.In the programming phases t2, the 4th transistor T4 and the 8th transistor T8 are turned on jointly, thus will
The source electrode of third transistor T3 is connected with section point N2.
The threshold voltage of driving transistor T3 in each pixel circuit is not quite similar, and causes to flow into Organic Light Emitting Diode
The electric current of OLED is inconsistent so that the uniformity of current each pixel unit luminosity is deteriorated, and picture quality is uneven；This implementation
The example pixel circuit includes having threshold voltage compensation transistor, the 4th transistor T4 and the 8th transistor T8, threshold voltage
It compensates transistor to store the information of threshold voltage to the first capacitor C1, become for the threshold voltage of compensation for drive transistor T3
Change, so as to improve the light characteristic of current pixel unit, so that display device shows the image with balanced picture quality.
5th transistor T5 is connected between the first power supply ELVDD and first node N1, and the grid of the 5th transistor T5 connects
It is connected to scan line Sn1；6th transistor T6 is connected between third transistor T3 and Organic Light Emitting Diode OLED, the 6th crystal
The grid connection scan line Sn1 of pipe T6.
In the glow phase t3, the scanner driver exports low level scanning signal to the first scan line Sn1, conducting
The source electrode of 5th transistor T5 and the 6th transistor T6, third transistor T3 are connected to the first power supply ELVDD, driving transistor
T3 is connected to Organic Light Emitting Diode OLED, so as to which driving transistor T3 is supplied to Organic Light Emitting Diode OLED driving electricity
Stream.High level scan control signal is being supplied to the period of scan line Sn1, the 6th transistor T6 cut-offs thus prevent
Driving current is provided to Organic Light Emitting Diode OLED.
First capacitor C1 is connected between section point N2 and the 3rd node N3.In initial phase t1, pass through first
Transistor T1 and the 7th transistor T7 provides the 3rd supply voltage ELVL to initialize the first capacitor C1；Thereafter, in programming rank
Section t2, will be with passing through second transistor T2, and the data that third transistor T3, the 8th transistor T8 and the 4th transistor T4 are provided are believed
Number corresponding voltage is stored in the first capacitor C1；Finally, in glow phase t3, i.e. pixel circuit 110 enters normal luminous
Show the period, Organic Light Emitting Diode OLED begins to send out light corresponding with data voltage, Organic Light Emitting Diode OLED sun
The variation of pole tension feeds back to the grid of driving transistor T3 by the first capacitor C1 in parallel therewith.Due to all transistors
For the identical field-effect tube of raceway groove polarity, such as all p-type field-effect tube or all N-type field-effect tube, work as driving transistor
During the gate drive voltage increase of T3, the voltage difference between source-drain electrode reduces so that flows into Organic Light Emitting Diode OLED anodes
Electric current reduce, when the gate drive voltage of driving transistor T3 is reduced, the voltage difference increase between source-drain electrode so that flow into
The electric current of Organic Light Emitting Diode OLED anodes increases, so as to flow through Organic Light Emitting Diode OLED in each pixel unit 110
Current compensation it is consistent, effectively solve due to Organic Light Emitting Diode in each pixel unit caused by the difference of carrier mobility
OLED brightness irregularities influence the problem of display effect.
Due to the 4th transistor T4 and the 8th transistor T8, there are leakage currents so that load in driving transistor T3 grids
Voltage of the gate drive voltage in the glow phase t3 of each frame changes so that the bad stability of pixel unit brightness,
It is serious so as to cause image flicker.But pixel circuit described in the present embodiment has leakage compensated transistor, i.e. first crystal
Pipe T1 and the 7th transistor T7, leakage compensated transistor are used in pixel light emission stage t3 compensation since threshold voltage compensation is brilliant
Body pipe（4th transistor T4 and the 8th transistor T8）Leakage current cause driving transistor T3 grid voltage variation, so as to
The blinking characteristic of pixel unit can be improved, so that display device shows the image with low flicker picture quality.
Embodiment 2
The present embodiment provides a kind of pixel circuit and its driving method, as shown in figure 3, the pixel circuit and its driving side
Method uniquely the difference is that, second is electrically connected between the 5th transistor T5 source electrodes and the drain electrode of the first transistor T1 with embodiment 1
Capacitor C2.
Second capacitor C2 is electrically connected to section point N2, the first capacitor C1 with the first transistor T1 pole plates being electrically connected
The anode voltage negative feedback of Organic Light Emitting Diode OLED can be played simultaneously with the second capacitor C2, it is therefore, described organic
The voltage of light emitting diode OLED anodes feedback is multiplied by C1/ (C1+C2) factor, thus can be by setting the second capacitance
The capacitance of device C2 controls the voltage of Organic Light Emitting Diode OLED anodes feedback, and control that can be more flexible flows into
The electric current of the Organic Light Emitting Diode OLED, so as to which the electricity of Organic Light Emitting Diode OLED will be flowed through in each pixel unit 110
Stream compensation is consistent, effectively solves due to Organic Light Emitting Diode OLED in each pixel unit caused by the difference of carrier mobility
Brightness irregularities influence the problem of display effect.
Embodiment 3
The present embodiment provides a kind of active array organic light emitting display device of pixel circuit described in Application Example 1,
As shown in figure 5, active array organic light emitting display device includes described in the present embodiment：Several pixel units 110, scanner driver
120 and data driver 130.The pixel unit 110 is arranged in the intersection of scan line Sni and data cable Dm in the matrix form
Region, and pass through data cable Dm and be electrically connected with data driver 130, be electrically connected by scan line Sni with scanner driver 120.
The initial phase t1 that each pixel unit 110 provides scan control signal in scan line Sni is initialised, and
Pixel unit 110 is in the programming of the scan line Sni scan control signals provided（programming）Stage t2 receives from data cable
The data-signal that Dm is provided;Suitable electricity is transitted to after glow phase t3, the scan control signal provided in scan line Sn
It is flat, so as to provide electric current to the Organic Light Emitting Diode OLED set in each pixel unit 110 so that pixel unit 110
Transmitting shows image with the light with data-signal corresponding bright.
Meanwhile pixel unit 110 receives the first power supply ELVDD, second source ELVSS and the 3rd power supply ELVL, the first electricity
Source ELVDD and second source ELVSS are used separately as high level voltage source and low level voltage source；First power supply ELVDD and second
Power supply ELVSS is used as the driving power of pixel unit 110.
Scanner driver 120 is generated to be provided with external（For example, it is provided from timing control unit）Scan control signal phase
The scan control signal answered, by the scan control signal generated by scanning monitor 120 respectively by line n scan line Sn1 extremely
Sn3 is sequentially supplied to pixel unit 110.
Data driver 130 is generated to be provided with external（For example, it is provided from timing control unit）Data and data control
The corresponding data-signal of signal.To data cable D1 to Dm and scanning signal be passed through by the data-signal that data driver 130 generates
It is provided synchronously to pixel unit 110.
A kind of active array organic light emitting display device described in the present embodiment, all transistors are ditch in pixel circuit
The identical field-effect tube of road polarity, it is electric between the anode of Organic Light Emitting Diode OLED and the grid of the driving transistor T3
It is connected with the first capacitor C1；Each pixel circuit is when responding same data-signal, the in parallel with driving transistor T3 first electricity
Voltage change is fed back to the grid of driving transistor T3 by container C1, so as to flow through Organic Light Emitting Diode in each pixel unit
The current compensation of OLED is consistent, effectively solves since Organic Light Emitting Diode OLED caused by the difference of carrier mobility is uneven
The problem of even influence display effect；The pixel circuit also has threshold voltage compensation transistor（4th transistor T4 and the 8th
Transistor T8）, threshold voltage compensation transistor stores the information of threshold voltage to the first capacitor C1, brilliant for compensating driving
The threshold voltage variation of body pipe T3, so as to improve the light characteristic of current pixel unit, has so that display device is shown
The image of balanced picture quality；The pixel circuit has leakage compensated transistor（The first transistor T1 and the 7th transistor
T7）, leakage compensated transistor is used to make due to the leakage current of threshold voltage compensation transistor in pixel light emission stage t3 compensation
Into the variation of the grid voltage of driving transistor T3, so as to improve the blinking characteristic of pixel unit, so that display device
Image of the display with low flicker picture quality.Further, since the pixel circuit reduces the leakage of driving transistor T3 grids
Electric current, it is thereby possible to reduce in pixel circuit storage capacitance capacitance, so as to reduce capacity area so that pixel electricity
The space of a whole page area on road reduces, and can realize the purpose for improving the active array organic light emitting display device resolution ratio.
Obviously, the above embodiments are merely examples for clarifying the description, and is not intended to limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation thus extended out or
Variation is still in the protection scope of this invention.
Claims (11)
1. a kind of pixel circuit, be electrically connected by data cable (Dm) with data driver (130), by scan line (Sni) with sweeping
Retouch driver (120) electrical connection, each pixel circuit further comprises the first power supply (ELVDD), second source (ELVSS), suitable
The secondary driving transistor (T3) being connected between the first power supply (ELVDD) and second source (ELVSS) and Organic Light Emitting Diode
(OLED), which is characterized in that each pixel circuit further includes：
First capacitor (C1) is connected electrically in the anode of the Organic Light Emitting Diode (OLED) and the driving transistor (T3)
Grid between；
Each pixel circuit further includes：
The first transistor (T1) is connected electrically between the 7th transistor (T7) and first capacitor (C1), and described first is brilliant
The grid of body pipe (T1) is electrically connected to three scan line (Sn3)；
7th transistor (T7) is connected electrically between the first transistor (T1) and the 3rd power supply (ELVL), and the described 7th is brilliant
The grid of body pipe (T7) is electrically connected to the three scan line (Sn3)；
3rd power supply (ELVL) is adjusted generation, the 3rd power supply (ELVL) and the driving by external drive circuit in real time
Voltage absolute value of the difference between transistor (T3) grid is equal to first power supply (ELVDD) and the driving transistor (T3)
Voltage absolute value of the difference between grid is equal；
Each pixel circuit further includes：
Second transistor (T2) is connected electrically between data cable (Dm) and driving transistor (T3), the second transistor
(T2) grid is electrically connected to the second scan line (Sn2)；
4th transistor (T4) is connected electrically between the first transistor (T1) and the 8th transistor (T8), and the described 4th is brilliant
The grid of body pipe (T4) is electrically connected to the second scan line (Sn2)；
8th transistor (T8), is connected electrically between the 4th transistor (T4) and the driving transistor (T3).
2. pixel circuit according to claim 1, which is characterized in that first power supply (ELVDD) is high level voltage
Source, the second source (ELVSS) are low level voltage source.
3. pixel circuit according to claim 2, which is characterized in that each pixel circuit further includes：
5th transistor (T5) is connected electrically between the first power supply (ELVDD) and the driving transistor (T3), and the described 5th is brilliant
The grid of body pipe (T5) is electrically connected to the first scan line (Sn1)；
6th transistor (T6), be connected electrically in the driving transistor (T3) and Organic Light Emitting Diode (OLED) anode it
Between, the grid of the 6th transistor (T6) is electrically connected to first scan line (Sn1).
4. pixel circuit according to claim 3, which is characterized in that the source electrode of the 4th transistor (T4) is electrically connected to
The pole that the grid and first capacitor (C1) of the driving transistor (T3) are electrically connected with the first transistor (T1)
Plate.
5. pixel circuit according to claim 3, which is characterized in that first power supply (ELVDD) and the described first electricity
The second capacitor (C2), and second capacitor (C2) and first capacitor (C1) are also electrically connected between container (C1)
The pole plate of electrical connection is also electrically connected to the grid of the driving transistor (T3).
6. according to any pixel circuits of claim 1-5, which is characterized in that all transistors are raceway groove polarity phase
Same field-effect tube.
7. the driving method of any pixel circuits of a kind of claim 1-6, which is characterized in that by every row pixel unit
Scan period is divided into initial phase (t1), programming (programming) stage (t2) and glow phase (t3), including walking as follows
Suddenly：
S1, at the initial phase (t1), scanner driver exports low level scanning signal to three scan line (Sn3), leads
Logical the first transistor (T1) and the 7th transistor (T7) so that the voltage of the 3rd power supply (ELVL) is supplied to drive as resetting voltage
Dynamic transistor (T3)；
S2, at the programming phases (t2), the scanner driver exports low level scanning signal to the second scan line (Sn2),
Second transistor (T2), the 4th transistor (T4) and the 8th transistor (T8) are turned on, since the driving transistor (T3) is in institute
It states initial phase (t1) to be initialised, so driving transistor (T3) forward conduction, charges to the first capacitor (C1)；
S3, at the glow phase (t3), the scanner driver exports low level scanning signal to the first scan line (Sn1),
The 5th transistor (T5) and the 6th transistor (T6) are turned on, driving current is along the first power supply (ELVDD) through the 5th transistor
(T5), the driving transistor (T3), the 6th transistor (T6) and Organic Light Emitting Diode (OLED) flow to second source
(ELVSS), current line pixel unit luminescence display image.
8. the driving method of pixel circuit according to claim 7, which is characterized in that the 3rd power supply (ELVL) is by outer
Portion's driving circuit adjusts generation, the voltage difference between the 3rd power supply (ELVL) and the driving transistor (T3) grid in real time
Absolute value be equal to voltage absolute value of the difference phase between first power supply (ELVDD) and the driving transistor (T3) grid
Deng.
9. the driving method of the pixel circuit according to claim 7 or 8, which is characterized in that first power supply (ELVDD)
For high level voltage source, the second source (ELVSS) is low level voltage source.
10. the driving method of pixel circuit according to claim 9, which is characterized in that in step S2, the driving crystal
It also charges after managing (T3) forward conduction to the second capacitor (C2).
11. a kind of active array organic light emitting display device, which is characterized in that including any pixels of claim 1-6
Circuit.
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| CN107818754A (en) * | 2016-09-12 | 2018-03-20 | 昆山国显光电有限公司 | Image element circuit and active matrix/organic light emitting display |
| KR102481514B1 (en) * | 2018-08-02 | 2022-12-27 | 삼성디스플레이 주식회사 | Display device and method of compensating degradation of the same |
| CN112771603B (en) * | 2018-09-28 | 2023-07-11 | 夏普株式会社 | Display device and driving method thereof |
| CN110047383B (en) * | 2019-04-29 | 2021-06-22 | 昆山国显光电有限公司 | Display panel and display device |
| TWI713011B (en) * | 2019-08-27 | 2020-12-11 | 友達光電股份有限公司 | Pixel circuit |
| TWI693589B (en) * | 2019-09-16 | 2020-05-11 | 友達光電股份有限公司 | Pixel circuit |
| CN112701751B (en) * | 2020-12-22 | 2023-04-14 | 维沃移动通信有限公司 | Power supply circuit, power supply method and electronic equipment |
| GB2615719A (en) | 2021-04-26 | 2023-08-16 | Boe Technology Group Co Ltd | Pixel circuit, pixel driving method and display device |
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| KR100805597B1 (en) * | 2006-08-30 | 2008-02-20 | 삼성에스디아이 주식회사 | Pixel, organic light emitting display device and driving method thereof |
| KR20090042405A (en) * | 2007-10-26 | 2009-04-30 | 엘지디스플레이 주식회사 | Organic light emitting display |
| JP5360684B2 (en) * | 2009-04-01 | 2013-12-04 | セイコーエプソン株式会社 | Light emitting device, electronic device, and pixel circuit driving method |
| CN102110407B (en) * | 2009-12-28 | 2012-12-12 | 京东方科技集团股份有限公司 | Pixel driving circuit, electric discharge method, data read-in method and drive display method |
| CN102708785B (en) * | 2011-05-18 | 2015-06-24 | 京东方科技集团股份有限公司 | Pixel unit circuit, working method therefore and organic light emitting diode (OLED) display device |
| CN102346999B (en) * | 2011-06-27 | 2013-11-06 | 昆山工研院新型平板显示技术中心有限公司 | AMOLED (Active Matrix/Organic Light-Emitting Diode) pixel circuit and driving method thereof |
| CN102651194B (en) * | 2011-09-06 | 2014-02-19 | 京东方科技集团股份有限公司 | Voltage driving pixel circuit, driving method thereof and display panel |
| CN103366682B (en) * | 2013-07-25 | 2015-06-17 | 京东方科技集团股份有限公司 | Alternating current drive OLED (Organic Light Emitting Diode) circuit, driving method and display device |
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Effective date of registration: 20201209 Address after: No.146 Tianying Road, high tech Zone, Chengdu, Sichuan Province Patentee after: Chengdu CHENXIAN photoelectric Co.,Ltd. Address before: NO.320 Fuchunjiang Road, Optoelectronic Industrial Park, Kunshan Development Zone, Suzhou City, Jiangsu Province Patentee before: Kunshan New Flat Panel Display Technology Center Co.,Ltd. Patentee before: KunShan Go-Visionox Opto-Electronics Co.,Ltd. |