CN105336292B - Oled pixel compensation circuit and oled pixel driving method - Google Patents
Oled pixel compensation circuit and oled pixel driving method Download PDFInfo
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Abstract
The invention discloses a kind of OLED pixel compensation circuit and OLED pixel driving method, including：Threshold value compensation module, the threshold voltage of the load drive module is obtained for observing and receives the data voltage of outside, and then the data voltage is compensated to obtain driving voltage and be stored using the threshold voltage；Drive module is loaded, the driving voltage exported for reception by the threshold value compensation module and the driving current that the driving voltage is converted to driving Organic Light Emitting Diode.This method with the influence of brightness of the change of the supply voltage of compensation pixel compensation circuit to Organic Light Emitting Diode, can also not only reduce the leakage current of the transistor in cut-off state in OLED pixel compensation circuit to being influenceed caused by the grid voltage of driving transistor so as to reduce influence of the leakage current of transistor to picture quality.
Description
Technical field
The present invention relates to a kind of pixel compensation circuit and image element driving method, espespecially a kind of picture for OLED display
Plain compensation circuit and image element driving method.
Background technology
OLED display has a small volume, it is simple in construction, from main light emission, brightness is high, image quality is good, visible angle is big, power consumption
The advantages that low and response time is short, thus cause extensive concern, most probably turn into the Display Technique of future generation of substitution liquid crystal.
Although OLED display has above-mentioned advantage, also extend many problems in its application process, such as
The change of the material property for the thin film transistor (TFT) (ThinFilmTransistor, TFT) that OLED is used as switch or driving element
The different uneven phenomenon that Display panel can be caused with material aging degree difference.It can cause after other OLED long-time uses
OLED aging, the problem of threshold voltage rises, luminous efficiency declines can be produced with the aging of device.
In order to solve the above problems, some producers are introducing pixel compensation circuit in OLED pixel, and Fig. 1 show existing
A kind of OLED pixel compensation circuit in technology, the circuit can be with the threshold voltage V of compensation for drive transistorthIt is bright to OLED pixel
The influence of degree.Pixel compensation circuit shown in Fig. 1 includes a compensating electric capacity C31, compensating electric capacity C31For storing OLED pictures
The data voltage V of elementdataWith the threshold voltage V of driving transistorth.The compensating electric capacity C when OLED pixel is in dispaly state31It is interior
The voltage of storage is applied to driving transistor T31Grid, compensating electric capacity C when OLED pixel is in luminance in theory31
The voltage at both ends keeps constant, but due to some transistors its source electrode and leakage in cut-off state in OLED pixel compensation circuit
Still there is a small amount of leakage current between pole, these leakage currents can cause compensating electric capacity C31The voltage of memory storage changes.Compensation electricity
Hold C31The change of both end voltage can cause driving transistor T36Grid voltage changes, driving transistor T36Grid voltage
The size of current for flowing through OLED both ends can be influenceed so as to cause pixel intensity to produce change beyong contemplation by changing, and this pixel is bright
The change of degree can have adverse effect on to the picture quality of OLED display.
The content of the invention
It is an object of the invention to provide a kind of OLED pixel compensation circuit and OLED pixel driving method, it can not only
Compensate the threshold voltage V of different driving transistorthInconsistent the problem of causing OLED display image uneven, further exist
The OLED pixel compensation circuit can also solve the driving electricity of driving transistor when OLED pixel compensation circuit is in dispaly state
Pressure changes the problem of causing OLED brightness to free change.
In order to solve the above problems, the present invention provide a kind of OLED pixel compensation circuit it include：Load drive module with
And threshold value compensation module, wherein：
The threshold value compensation module, the threshold voltage of the load drive module is obtained for observing and receives outside
Data voltage, and then the data voltage is compensated to obtain driving voltage and be stored using the threshold voltage；
The load drive module, for receiving the driving voltage that is exported by the threshold value compensation module and by institute
State the driving current that driving voltage is converted to driving Organic Light Emitting Diode.
The present invention it is OLED pixel compensation circuit further improvement is that：It also includes：Initialization module；
The threshold value compensation module is connected with load drive module, data signal end and first scanning end, for seeing
Measure the threshold voltage of the load drive module and be controlled by first scanning end and receive the data signal end
Data voltage；
The load drive module is connected with light emitting control end and the threshold value compensation module, described luminous for being controlled by
Control terminal and receive the driving voltage exported by the threshold value compensation module and the driving voltage be converted into driving
The driving current of Organic Light Emitting Diode；
The initialization module is connected with the second scanning end, reset power and the threshold value compensation module, for
When the signal of two scanning ends is effective the driving voltage stored by the threshold value compensation module is removed using the reset power.
The present invention it is OLED pixel compensation circuit further improvement is that：The load drive module includes driving crystal
Pipe, second transistor and third transistor, the source electrode of the second transistor are connected to first power supply, the connection of its grid
In the light emitting control end, it, which drains, is connected to the source electrode of the driving transistor；The source electrode of the driving transistor is connected to
The first node, it, which drains, is connected to the source electrode of the third transistor；The grid of the third transistor and described luminous
Control terminal connects, and it, which drains, is connected to the anode of Organic Light Emitting Diode, and the negative electrode of the Organic Light Emitting Diode is connected to the
Two power supplys；Threshold voltage of the threshold voltage of the driving transistor as the load drive module.
The present invention it is OLED pixel compensation circuit further improvement is that：The threshold value compensation module also includes first and mended
Electric capacity, the second compensating electric capacity, the 4th transistor, the 5th transistor and the 6th transistor are repaid, wherein：4th transistor
Grid is connected to first scanning end, and its source electrode is connected to the data signal end, and its drain electrode is connected to the first node；
The grid of 5th transistor is connected to first scanning end, and its source electrode is connected to the section point, its connection that drains
In the source electrode of the 6th transistor；The grid of 6th transistor is connected to first scanning end, and its drain electrode is connected to described
The drain electrode of driving transistor；The section point connects with the grid of the driving transistor；The one of first compensating electric capacity
End is connected to first power supply, and its other end is connected to the 3rd node, and one end of second compensating electric capacity is connected to described
3rd node, its other end are connected to the section point, and first compensating electric capacity and second compensating electric capacity are used for
Store the driving voltage.
The present invention it is OLED pixel compensation circuit further improvement is that：The initialization module includes the 7th crystal
Pipe, the 8th transistor and the 9th transistor, wherein：The source electrode of 7th transistor is connected to the 3rd node, its grid
Pole is connected to the second scanning end, and it, which drains, is connected to the source electrode of the 8th transistor；The grid connection of 8th transistor
In second scanning end, its drain electrode is connected to the reset power；The source electrode of 9th transistor is connected to the reset
Power supply, its grid are connected to second scanning end, and it, which drains, is connected to the anode of the Organic Light Emitting Diode.
The present invention it is OLED pixel compensation circuit further improvement is that：The second transistor, third transistor,
Four transistors, the 5th transistor, the 6th transistor, the 7th transistor, the 8th transistor, the 9th transistor and driving transistor
It is P-channel thin film transistor (TFT).
The present invention it is OLED pixel compensation circuit further improvement is that：First power supply, second source and institute
It is dc source to state reset power, and the voltage of the first power supply output is more than the voltage of reset power output, and
The voltage of the reset power output is more than the voltage of second source output.
The present invention a kind of OLED pixel driving method suitable for above-mentioned OLED pixel compensation circuit is also provided, it include with
Lower step：
S1, compensation process：Data voltage outside the threshold value compensation module reception, simultaneously threshold value compensation module sight
Survey the threshold voltage of the load drive module and the data voltage is compensated using the threshold voltage observed to obtain
Driving voltage is simultaneously stored；
S2, luminescence display process：The load drive module receives the driving electricity of the threshold value compensation module output
Pressure, and the driving voltage is converted into the driving current for driving organic light-emitting diode.
The present invention a kind of OLED pixel driving method suitable for above-mentioned OLED pixel compensation circuit is also provided, it include with
Lower step：
S1, reseting procedure：Initialization module removes the drive stored in threshold value compensation module under the control of the second scanning end
Dynamic voltage；
S2, compensation process：The threshold value compensation module is controlled by the first scanning end and receives the data electricity of data signal end
Press, simultaneously the threshold value compensation module observes the threshold voltage of the load drive module and using the threshold value observed
Voltage compensates the data voltage to obtain driving voltage and be stored；
S3, luminescence display process：The load drive module is controlled by light emitting control end and receives the valve value compensation mould
The driving voltage of block output, and the driving voltage is converted into the driving electricity for driving organic light-emitting diode
Stream.
The present invention it is OLED pixel driving method further improvement is that：Flowed through in the reseting procedure described organic
The electric current of light emitting diode is less than the glow current of the Organic Light Emitting Diode.
The present invention a kind of OLED pixel driving method suitable for above-mentioned OLED pixel compensation circuit is also provided, it include with
Lower step：
S1, reseting procedure：Second scanning end controls the 7th transistor, the 8th brilliant pipe and the 9th transistor turns,
Initialization module removes the threshold voltage and data voltage stored in threshold value compensation module under the control of the second scanning end；
S2, compensation process：First scanning end controls the 4th transistor, the 5th transistor and the 6th transistor turns, drives
Dynamic transistor is in diode-connected, and threshold value compensation module receives the data voltage of data signal end, simultaneously valve value compensation mould
The threshold voltage of block observation driving transistor and using data voltage described in the threshold voltage compensation observed to be driven
Voltage, and the driving voltage is stored in first compensating electric capacity and second compensating electric capacity；
S3, luminescence display process：Light emitting control end controls second transistor and third transistor to turn on, the 4th transistor,
5th transistor and the 6th transistor are off state, first compensating electric capacity, second compensating electric capacity and
The voltage superposition of one power supply to the driving transistor grid, now, it is described load drive module in the driving crystal
Pipe receives the driving voltage of the threshold value compensation module output, and the driving voltage is converted to for driving organic light-emitting diodes
The luminous driving current of pipe.
The present invention it is OLED pixel driving method further improvement is that：Flowed through in the reseting procedure described organic
The electric current of light emitting diode is less than the glow current of the Organic Light Emitting Diode.
The first compensating electric capacity and the second compensating electric capacity are included in the OLED pixel compensation circuit of the present invention, on the one hand these should
Compensating electric capacity can be with the voltage of memory data signal and the threshold voltage V of driving transistor in compensation processth, on the other hand
First compensating electric capacity and the second compensating electric capacity can be reduced in OLED pixel compensation circuit in cut-off during the luminescence display
The leakage current of the transistor of state caused by the grid voltage of driving transistor on influenceing so as to reduce the leakage current pair of transistor
The influence of picture quality.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of OLED pixel compensation circuit of the prior art；
Fig. 2 is the circuit diagram of the OLED pixel compensation circuit of the present invention；
Fig. 3 is the timing diagram of the drive signal of pixel compensation circuit in OLED pixel driving method of the present invention；
Fig. 4 is in circuit state during reseting procedure for OLED pixel compensation circuit in OLED pixel driving method of the present invention
Figure；
Fig. 5 is in circuit state during compensation process for OLED pixel compensation circuit in OLED pixel driving method of the present invention
Figure；
Fig. 6 is the circuit shape that OLED pixel compensation circuit is in luminescence display process in OLED pixel driving method of the present invention
State figure；
Fig. 7 is in luminescence display mistake for the OLED pixel compensation circuit of OLED pixel compensation circuit of the present invention and prior art
Current vs' figure of driving transistor is flowed through during journey.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is further detailed explanation.
As shown in Fig. 2 the OLED pixel compensation circuit of the present invention includes：Load drive module 10, threshold value compensation module 20
And initialization module 30, wherein：
Threshold value compensation module 20 and load drive module 10, data signal end DmAnd the first scanning end SnConnection.Threshold value is mended
Repay module 20 be used for observe load drive module 10 threshold voltage VthAnd it is controlled by the first scanning end SnAnd receive data letter
Number end DmData voltage, and then utilize threshold voltage VthTo compensate the data voltage to obtain driving voltage and be deposited
Storage；
Load drive module 10 and light emitting control end EnAnd threshold value compensation module 20 connects.Load drive module 10 is used for
It is controlled by light emitting control end EnAnd receive the driving voltage exported by threshold value compensation module 20 and driving voltage is converted into drive
The driving current of dynamic Organic Light Emitting Diode；
The scanning end S of initialization module 30 and secondn-1, reset power VintAnd threshold value compensation module 20 connects.Initialization
Module 30 is used in the second scanning end Sn-1Signal it is effective when use reset power VintRemove stored by threshold value compensation module 20
Driving voltage.
As shown in Fig. 2 load drive module 10 includes driving transistor T1, second transistor T2And third transistor T3,
Second transistor T2Source electrode be connected to the first power supply EELVDD, its grid is connected to light emitting control end En, its drain electrode is connected to drive
Dynamic transistor T1Source electrode；Driving transistor T1Source electrode be connected to first node a, its drain electrode is connected to third transistor T3's
Source electrode；Third transistor T3Grid and light emitting control end EnConnection, it, which drains, is connected to the anode of Organic Light Emitting Diode, has
The negative electrode of machine light emitting diode is connected to second source ELVSS；Driving transistor T1Threshold voltage as load drive module 10
Threshold voltage Vth.As light emitting control end EnDriving transistor T when the signal of output is effective1Driving voltage is converted into driving has
The electric current of machine light emitting diode.
As shown in Fig. 2 threshold value compensation module 20 and data signal end DmAnd the first scanning end SnConnection, valve value compensation mould
Block 20 includes the first compensating electric capacity C1, the second compensating electric capacity C2, the 4th transistor T4, the 5th transistor T5And the 6th transistor
T6, wherein：4th transistor T4Grid be connected to the first scanning end Sn, its source electrode is connected to data signal end Dm, its company of drain electrode
It is connected to first node a；5th transistor T5Grid be connected to the first scanning end Sn, its source electrode is connected to section point b, and it leaks
Pole is connected to the 6th transistor T6Source electrode；6th transistor T6Grid be connected to the first scanning end Sn, its drain electrode is connected to drive
Dynamic transistor T1Drain electrode；Section point b and driving transistor T1Grid connection；First compensating electric capacity C1One end be connected to
First power supply ELVDD, its other end is connected to the 3rd node c, the second compensating electric capacity C2One end be connected to the 3rd node c, its is another
One end is connected to section point b.Threshold value compensation module 20 is used to observing and storing driving transistor T1Threshold voltage Vth, and
Use the threshold voltage V observedthMend from repaying data signal end DmThe data voltage of acquisition, the data voltage after compensation is as drive
Dynamic voltage is stored in the first compensating electric capacity C1And the second compensating electric capacity C2In.As light emitting control end EnWhen the signal of output is effective,
Driving voltage is output to load drive module 10 by threshold value compensation module 20 from section point b.
As shown in Fig. 2 initialization module 30 includes the 7th transistor T7, the 8th transistor T8And the 9th transistor T9, its
In：7th transistor T7Source electrode be connected to the 3rd node c, its grid is connected to the second scanning end Sn-1, it, which drains, is connected to the
Eight transistor T8Source electrode；8th transistor T8Grid be connected to the second scanning end Sn-1, its drain electrode is connected to reset power
Vint；9th transistor T9Source electrode be connected to reset power Vint, its grid is connected to the second scanning end Sn-1, its connection that drains
In the anode of Organic Light Emitting Diode.As the second scanning end Sn-1Signal it is effective when initialization module 30 utilize reset power Vint
Remove the first compensating electric capacity C1And the second compensating electric capacity C2The driving voltage of middle storage.
As shown in Fig. 2 second transistor T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th crystal
Pipe T6, the 7th transistor T7, the 8th transistor T8, the 9th transistor T9And driving transistor T1It is P-channel thin film transistor (TFT).
First power supply ELVDD, second source ELVSSAnd reset power VintIt is dc source, the first power supply ELVDDThe voltage of output is big
In reset power VintThe voltage of output, and reset power VintThe voltage of output is more than second source ELVSSThe voltage of output.
As shown in figure 3, the OLED pixel driving method of the present embodiment passes through the first scanning end Sn, the second scanning end Sn-1With
And light emitting control end EnThe transistor in OLED pixel compensation circuit is controlled to turn on or turn off according to predetermined sequential.This implementation
The method of example includes following three steps：
S1, reseting procedure：T in corresponding diagram 31State, now the second scanning end Sn-1Control the 7th transistor T7, the 8th brilliant pipe
T8And the 9th transistor T9Conducting, initialization module 30 is in the second scanning end Sn-1Control under remove threshold value compensation module 20 in
The driving voltage of storage；
S2, compensation process：T in corresponding diagram 32State, the first scanning end SnControl the 4th transistor T4, the 5th transistor T5
And the 6th transistor T6Conducting, driving transistor T1In diode-connected, threshold value compensation module 20 receives data signal end Dm's
Data voltage, while threshold value compensation module 20 observes driving transistor T1Threshold voltage VthAnd use the threshold value electricity observed
Press VthOffset data voltage, the data voltage after compensation are stored in the first compensation electricity of threshold value compensation module 20 as driving voltage
Hold C1And the second compensating electric capacity C2In；
S3, luminescence display process：T in corresponding diagram 33State, light emitting control end EnControl second transistor T2With the 3rd crystal
Pipe T3Conducting, the 4th transistor T4, the 5th transistor T5And the 6th transistor T6It is off state, the first compensating electric capacity C1、
Second compensating electric capacity C2And the first power supply ELVDDVoltage superposition to driving transistor T1Grid, now load drive module
10 receive the driving voltage that threshold value compensation module 20 exports, driving transistor T1Driving voltage is converted into driving organic light emission two
The electric current of pole pipe is so as to driving organic light-emitting diode.
As shown in Figure 3 and Figure 4, the first scanning end S when OLED pixel compensation circuit is in reseting procedurenAnd luminous control
End E processednFor high level, the second scanning end Sn-1For low level.Now by the first scanning end SnControl the 4th transistor T4, it is the 5th brilliant
Body pipe T5And the 6th transistor T6Shut-off；By the second scanning end Sn-17th transistor T of control7, the 8th transistor T8And
9th transistor T9Conducting；By light emitting control end EnThe second transistor T of control2With third transistor T3Shut-off.
When OLED pixel compensation circuit is in reseting procedure, the 7th transistor T7, the 8th transistor T8And the 9th crystal
Pipe T9It is in the conduction state, now from the first power supply ELVDD, the first compensating electric capacity C1, the 7th transistor T7, the 8th transistor T8, arrive
Reset power VintBetween form a path, now the first power supply ELVDDTo the first compensating electric capacity C1Charging is until the first compensation electricity
Hold C1The voltage V at both endsC1=ELVDD–Vint.In the process due to the transistor that section point b is connected all in cut-off shape
State, so the second compensating electric capacity C2The voltage at both ends does not change, due to the second compensating electric capacity C2One end be connected to Section three
Point c thus in reseting procedure driving transistor T1Grid voltage (section point b voltage) be equal to reset power VintAdd
Second compensating electric capacity C2The voltage V at both endsbc.Additionally, due to the 9th transistor T9Conducting from reset power Vint, the 9th transistor
T9, Organic Light Emitting Diode to second source ELVSSBetween form another path, the last luminescence display process in this path
In be accumulated in the electric charge at Organic Light Emitting Diode both ends and be released and due to flowing through Organic Light Emitting Diode in this process
Electric current very little so Organic Light Emitting Diode will not light.
As shown in Figure 3 and Figure 5, the second scanning end S when OLED pixel compensation circuit is in compensation processn-1It is and luminous
Control terminal EnFor high level, the first scanning end SnFor low level, the second scanning end Sn-1For high level.Now by the first scanning end Sn
Control the 4th transistor T4, the 5th transistor T5And the 6th transistor T6Conducting；By the second scanning end Sn-1The 7th of control is brilliant
Body pipe T7, the 8th transistor T8And the 9th transistor T9Shut-off；By light emitting control end EnThe second transistor T of control2With the 3rd
Transistor T3Shut-off.First scanning S when switching from reseting procedure to compensation processnEnd and the second scanning end Sn-1Voltage difference when
For low level.
When OLED pixel compensation circuit is in the state of compensation process, due to the 5th transistor T5And the 6th transistor
T6Conducting, so now driving transistor T1In diode-connected, so-called diode-connected is exactly driving transistor T1Grid
With drain electrode short circuit.Now in the first power supply ELVDD, the first compensating electric capacity C1, the second compensating electric capacity C2, driving transistor T1, the 4th
Transistor T4And data signal end DmBetween formed a current path.Now the first compensating electric capacity C1And second compensation electricity
Hold C2Pass through the first power supply ELVDDWith data signal end DmElectric discharge, flows through the electric current of above-mentioned current path with the first compensating electric capacity C1
And the second compensating electric capacity C2The reduction of both end voltage and reduce.The turn-on condition of above-mentioned current path is：The D of data signal endm
It is more than driving transistor T with section point b electrical potential difference1Threshold voltage Vth.First compensating electric capacity C1And second compensation electricity
Hold C2Discharged along above-mentioned current path until driving transistor T1Untill being not turned on.In summary, the first compensating electric capacity C1And the
Two compensating electric capacity C2The voltage U of section point when electric discharge is completedb=UDm-Vth.So far the observation of threshold value compensation module 20 driving crystal
Pipe T1Threshold voltage VthAnd use the threshold voltage V observedthOffset data voltage, the data voltage after compensation are stored in
First compensating electric capacity C1And the second compensating electric capacity C2In.
As shown in Figure 3 and Figure 6, the first scanning end S when OLED pixel compensation circuit is in luminescence display processnAnd the
Two scanning end Sn-1For high level, light emitting control end EnFor low level.Now by the first scanning end SnControl the 4th transistor T4,
Five transistor T5And the 6th transistor T6Shut-off；By the second scanning end Sn-17th transistor T of control7, the 8th transistor T8
And the 9th transistor T9Shut-off；By light emitting control end EnThe second transistor T of control2With third transistor T3Conducting.
When OLED pixel compensation circuit is in luminescence display state, due to second transistor T2And third transistor T3
Conducting and the first compensating electric capacity C1And the second compensating electric capacity C2On voltage and the first power supply ELVDDVoltage superposition to drive
Transistor T1Grid, a path is formed in OLED pixel compensation circuit：From the first power supply ELVDD, second transistor T2, driving
Transistor T1, third transistor T3, Organic Light Emitting Diode to second source ELVSS；For this path, if driving transistor
T1Grid voltage UbWith its source voltage ULVDDDifference be more than driving transistor T1Threshold voltage VthWhen driving transistor T1
Conducting.Due to now Organic Light Emitting Diode OLED and driving transistor T1Concatenation, so flowing through Organic Light Emitting Diode OLED
Electric current be equal to flow through driving transistor T1Electric current.In summary, as driving transistor T1Machine light emitting diode is flowed through during conducting
OLED electric current and section point b voltage UbMeet following relation：
IOLED=0.5 μpCOX(W/L)(ULVDD-Ub-Vth)2(formula 1.1)
String is due to the first compensating electric capacity C in addition1And the second compensating electric capacity C2The signal voltage of storage is superimposed to section point
B, it follows that the voltage U at first node bb：
Ub=UDm-Vth(formula 1.2)
Bringing formula 1.2 into formula 1.1 can obtain：
IOLED=0.5 μpCOX(W/L)(ULVDD-UDm)2(formula 1.3)
Understand to flow through Organic Light Emitting Diode OLED electric current I from formula 1.3OLEDThe only voltage U with data signal endDmAnd
Supply voltage ULVDDIt is relevant, and with driving transistor T1Threshold voltage VthIt is unrelated.It is apparent from, Organic Light Emitting Diode OLED's is bright
Spend the electric current I by flowing through Organic Light Emitting Diode OLEDOLEDDetermine, so the compensation by OLED pixel compensation circuit of the present invention
Driving transistor T can be eliminated afterwards1Threshold voltage VthInfluence of the error to machine light emitting diode OLED.A more step,
Due to the 7th transistor T7And the 8th transistor T8Concatenation, the 3rd node c during this considerably reduce in luminescence display state
Leakage current, and the first compensating electric capacity C1With the second compensating electric capacity C2It is connected in series to this and improves OLED pixel compensation
Circuit is from the equiva lent impedance at the 3rd node c.So when OLED pixel compensation circuit of the present invention is in luminescence display state its
Driving transistor T1Grid voltage it is more stable, so as to effectively improve the picture quality of OLED display.
Fig. 7 show the OLED pixel compensation circuit of OLED pixel compensation circuit of the present invention and prior art as shown in Figure 1
Current vs' figure of driving transistor is flowed through during in luminescence display process, Fig. 7 includes what electric current e and electric current f was changed over time
Curve, the electric current e of where the dotted line signifies that are that its driving crystalline substance is flowed through when pixel compensation circuit of the invention is in luminescence display process
Body pipe T1Driving current, another electric current f represented using solid line be in as existing OLED pixel compensation circuit as shown in figure
Its driving transistor T is flowed through during luminescence display process31Driving current.Fig. 7 extension electric current e shown over time is with the time
Variation tendency be far smaller than electric current f, because the electric current for flowing through driving transistor is determined by the grid voltage of driving transistor, institute
The pixel compensation circuit of the present invention is demonstrated with Fig. 7 can effectively be reduced because transistor drain current is to the electricity that is stored in compensating electric capacity
The influence of pressure.Because the brightness of Organic Light Emitting Diode is determined by the electric current for flowing through driving transistor, thus Fig. 7 another it is aobvious and
The conclusion being clear to is that the pixel compensation circuit of the present invention can improve Organic Light Emitting Diode brightness during luminescence display
Stability, and this stability can improve the picture quality of OLED display.
The present invention is described in detail above in association with accompanying drawing embodiment, those skilled in the art can be according to upper
State and bright many variations example is made to the present invention.Thus, some details in embodiment should not form limitation of the invention, this
Invention will be used as protection scope of the present invention using the scope that appended claims define.
Claims (5)
- A kind of 1. OLED pixel compensation circuit, for driving Organic Light Emitting Diode, it is characterised in that including：Load driving mould Block, threshold value compensation module and initialization module, wherein：The threshold value compensation module, the threshold voltage of the load drive module is obtained for observing and receives the data of outside Voltage, and then the data voltage is compensated to obtain driving voltage and be stored using the threshold voltage；The load drive module, for receiving the driving voltage that is exported by the threshold value compensation module and by the drive Dynamic voltage conversion is the driving current of driving Organic Light Emitting Diode；The threshold value compensation module is connected with load drive module, data signal end and first scanning end, for observing Obtain the threshold voltage of the load drive module and be controlled by first scanning end and receive the data signal end Data voltage；The load drive module is connected with light emitting control end and the threshold value compensation module, for being controlled by the luminous control End processed and receiving the driving voltage exported by the threshold value compensation module and the driving voltage is converted into driving has The driving current of machine light emitting diode；The initialization module is connected with the second scanning end, reset power and the threshold value compensation module, for being swept second Retouch end signal it is effective when the driving voltage stored by the threshold value compensation module is removed using the reset power；Its In,The load drive module includes driving transistor, second transistor and third transistor, the second transistor Source electrode is connected to the first power supply, and its grid is connected to the light emitting control end, and it, which drains, is connected to the source of the driving transistor Pole；The source electrode of the driving transistor is connected to first node, and it, which drains, is connected to the source electrode of the third transistor；Described The grid of three transistors connects with the light emitting control end, and it, which drains, is connected to the anode of Organic Light Emitting Diode, described organic The negative electrode of light emitting diode is connected to second source；The threshold voltage of the driving transistor is as the load drive module Threshold voltage；The threshold value compensation module also include the first compensating electric capacity, the second compensating electric capacity, the 4th transistor, the 5th transistor and 6th transistor, wherein：The grid of 4th transistor is connected to first scanning end, and its source electrode is connected to the data Signal end, its drain electrode are connected to the first node；The grid of 5th transistor is connected to first scanning end, its source Pole is connected to section point, and it, which drains, is connected to the source electrode of the 6th transistor；The grid of 6th transistor is connected to described First scanning end, it, which drains, is connected to the drain electrode of the driving transistor；The grid of the section point and the driving transistor Pole connects；One end of first compensating electric capacity is connected to first power supply, and its other end is connected to the 3rd node, and described One end of two compensating electric capacities is connected to the 3rd node, and its other end is connected to the section point, the first compensation electricity Hold and second compensating electric capacity is used to store the driving voltage；The initialization module includes the 7th transistor, the 8th transistor and the 9th transistor, wherein：7th transistor Source electrode be connected to the 3rd node, its grid is connected to the second scanning end, and its drain electrode is connected to the 8th transistor Source electrode；The grid of 8th transistor is connected to second scanning end, and its drain electrode is connected to the reset power；Described The source electrode of nine transistors is connected to the reset power, and its grid is connected to second scanning end, and its drain electrode is connected to described The anode of Organic Light Emitting Diode.
- 2. OLED pixel compensation circuit as claimed in claim 1, it is characterised in that：The second transistor, third transistor, 4th transistor, the 5th transistor, the 6th transistor, the 7th transistor, the 8th transistor, the 9th transistor and driving crystal Pipe is P-channel thin film transistor (TFT).
- 3. OLED pixel compensation circuit as claimed in claim 1, it is characterised in that：First power supply, second source and The reset power is dc source, and the voltage of the first power supply output is more than the voltage of reset power output, and And the voltage of the reset power output is more than the voltage of second source output.
- A kind of 4. OLED pixel driving method suitable for OLED pixel compensation circuit as claimed in claim 1, it is characterised in that Including：S1, reseting procedure：Second scanning end controls the 7th transistor, the 8th brilliant pipe and the 9th transistor turns, initially Change module and the threshold voltage and data voltage stored in threshold value compensation module is removed under the control of the second scanning end；S2, compensation process：First scanning end controls the 4th transistor, the 5th transistor and the 6th transistor turns, driving crystalline substance Body pipe is in diode-connected, and threshold value compensation module receives the data voltage of data signal end, and simultaneously threshold value compensation module is seen Survey the threshold voltage of driving transistor and using data voltage described in the threshold voltage compensation observed to obtain driving voltage, And the driving voltage is stored in first compensating electric capacity and second compensating electric capacity；S3, luminescence display process：Light emitting control end controls second transistor and third transistor conducting, the 4th transistor, the 5th Transistor and the 6th transistor are off state, first compensating electric capacity, second compensating electric capacity and the first electricity The voltage superposition in source is to the grid of the driving transistor, and now, the driving transistor in the load drive module connects The driving voltage of the threshold value compensation module output is received, and the driving voltage is converted to for driving Organic Light Emitting Diode hair The driving current of light.
- 5. OLED pixel driving method as claimed in claim 4, it is characterised in that：Have described in being flowed through in the reseting procedure The electric current of machine light emitting diode is less than the glow current of the Organic Light Emitting Diode.
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| US10475371B2 (en) * | 2016-11-14 | 2019-11-12 | Int Tech Co., Ltd. | Pixel circuit in an electroluminescent display |
| CN106710529B (en) * | 2016-12-19 | 2019-02-05 | 上海天马有机发光显示技术有限公司 | A kind of pixel-driving circuit, driving method and organic light emitting display panel |
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| CN107038992B (en) | 2017-05-23 | 2019-06-18 | 上海和辉光电有限公司 | A kind of pixel circuit, driving method and display |
| CN109036284B (en) * | 2017-06-12 | 2020-09-01 | 上海和辉光电有限公司 | Pixel compensation circuit and display device |
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| CN107316613B (en) * | 2017-07-31 | 2019-07-09 | 上海天马有机发光显示技术有限公司 | Pixel circuit, its driving method, organic light emitting display panel and display device |
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| CN111445848B (en) * | 2020-04-30 | 2021-10-08 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display substrate |
| CN111445856B (en) * | 2020-05-13 | 2021-04-09 | 京东方科技集团股份有限公司 | Driving circuit, driving method, display panel and display device |
| JP2021196396A (en) * | 2020-06-09 | 2021-12-27 | 武漢天馬微電子有限公司 | Display device |
| CN111627387B (en) | 2020-06-24 | 2022-09-02 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof, display panel and display device |
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Address after: 201506, No. nine, No. 1568, Jinshan Industrial Zone, Shanghai, Jinshan District Patentee after: Shanghai Hehui optoelectronic Co., Ltd Address before: 201508, building two, building 100, 1, Jinshan Industrial Road, 208, Shanghai, Jinshan District Patentee before: EverDisplay Optronics (Shanghai) Ltd. |