CN106856087B - Pixel circuit and its driving method and organic light emitting display - Google Patents
Pixel circuit and its driving method and organic light emitting display Download PDFInfo
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- CN106856087B CN106856087B CN201510889502.9A CN201510889502A CN106856087B CN 106856087 B CN106856087 B CN 106856087B CN 201510889502 A CN201510889502 A CN 201510889502A CN 106856087 B CN106856087 B CN 106856087B
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Abstract
In pixel circuit provided by the invention and its driving method and organic light emitting display, the initialization voltage that the data voltage and third power supply that the electric current that the 6th transistor in the pixel circuit as driving element is exported is provided by data line provide determines, and it is unrelated with the external threshold voltage of supply voltage and the 6th transistor, therefore it can be avoided the brightness disproportionation as caused by threshold voltage deviation and IR change in pressure drop, the image with uniform luminance can be shown using the organic light emitting display of the pixel circuit and its driving method.
Description
Technical field
The present invention relates to technical field of flat panel display, in particular to a kind of pixel circuit and its driving method and organic light emission
Display.
Background technique
Organic light emitting display (OLED) is a kind of emerging flat-panel monitor, has actively luminous, contrast height, response
Many advantages, such as speed is fast, frivolous is known as that the display of new generation of liquid crystal display (LCD) can be replaced.
Referring to FIG. 1, its structural schematic diagram for the pixel circuit of the organic light emitting display of the prior art.Such as Fig. 1 institute
Show, existing pixel circuit 10 includes switching transistor T1, driving transistor T2 and storage capacitance Cs, the switching transistor T1
Grid connect with driving line Sn, the source electrode of the switching transistor T1 connect with data line Dm, described to drive transistor T2
The drain electrode of grid, switching transistor T1 is connected with the first substrate of storage capacitance Cs, it is described driving transistor T2 source electrode and deposit
The second substrate that storage holds Cs is connect with the first power supply ELVDD, the drain electrode of the driving transistor T2 and the organic light emission
The anode of diode OLED connects, and the cathode of the Organic Light Emitting Diode OLED is connect with second source ELVSS.
Wherein, the switching transistor T1 and driving transistor T2 is thin film transistor (TFT) (TFT).By driving line Sn to beat
When opening the switching transistor T1, the data voltage Vdata that data line Dm is provided is stored via the switching transistor T1 to depositing
Storage holds Cs, so that controlling the driving transistor T2 generates electric current, to drive the Organic Light Emitting Diode OLED to shine.This
When, flow through the calculation formula of the driving transistor T2 the current between the source and the drain Ion are as follows:
Ion=K × and (Vsg2- | Vth |)2
Wherein, K is electron mobility, breadth length ratio, the product of unit-area capacitance three of thin film transistor (TFT), and Vsg2 is driving
The source gate voltage of transistor T2, i.e. voltage difference between source electrode and grid, Vth are the threshold voltage for driving transistor T2.
Since the source voltage Vs2 of driving transistor T2 is equal to the first supply voltage VDD that the first power supply ELVDD is provided,
It drives the grid voltage Vg2 of transistor T2 to be equal to the data voltage Vdata that data line Dm is provided, therefore drives the source of transistor T2
Gate voltage Vsg2 is equal to VDD-Vdata.Flow through the driving transistor T2 the current between the source and the drain Ion can according to
Lower formula is calculated:
Ion=K × and (VDD-Vdata- | Vth |)2
It can be seen that the electric current for flowing through Organic Light Emitting Diode OLED will receive the threshold voltage vt h of driving transistor T2
With the influence for the supply voltage VDD for being actually applied to the pixel circuit 10.When the threshold voltage and power supply of driving transistor T2
When voltage VDD changes, the electric current for flowing through Organic Light Emitting Diode OLED will have greatly changed, and cause described organic
Light emitting diode OLED still launches the data-signal of same brightness the light of different brightness.
Currently, due to the limitation of manufacturing process, the threshold value electricity of the thin film transistor (TFT) of each pixel in organic light emitting display
Pressure is inevitably present difference, and organic light emitting display is caused brightness disproportionation phenomenon occur.Moreover, connecting the pixel circuit
There are certain impedances for 10 power supply cabling, and when a current flows through, power supply cabling, which will affect, is actually reached the pixel circuit
10 power supply positive pressure VDD, the power supply positive pressure VDD for causing each pixel circuit 10 to receive is inconsistent, and then aggravates brightness disproportionation
Phenomenon.Therefore, existing organic light emitting display is difficult the image that display has uniform luminance.
Base this, how to solve existing organic light emitting display because driving transistor threshold voltage deviation and power supply walk
Brightness disproportionation caused by line impedence, at those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
The purpose of the present invention is to provide a kind of pixel circuit and its driving method and organic light emitting displays, existing to solve
Some organic light emitting displays walk brightness disproportionation caused by line impedence because of the threshold voltage deviation and power supply of driving transistor.
To solve the above problems, the present invention provides a kind of pixel circuit, comprising:
The first transistor is connected between third node and fourth node, and grid is connected to the second driving line；
Second transistor is connected between fourth node and the anode of Organic Light Emitting Diode, and grid is connected to first
Drive line；
Third transistor is connected between second node and third node, and grid is connected to the second driving line；
4th transistor, is connected between data line and first node, and grid is connected to the second driving line；
5th transistor is connected between third power supply and third node, and grid is connected to the first driving line；
6th transistor is connected between the first power supply and fourth node, and grid is connected to second node；
7th transistor is connected between first node and third node, and grid is connected to third driving line；
Storage is connected between first node and second node；And
Organic Light Emitting Diode, anode are connect with the drain electrode of the second transistor, and cathode is connect with second source.
Optionally, in the pixel circuit, first power supply is high potential pixel power, and the second source is
Low potential pixel power, first power supply and second source are used as the driving power of the Organic Light Emitting Diode.
Optionally, in the pixel circuit, for the third power supply for providing reference voltage, the reference voltage is small
In the data voltage that the data line provides.
Optionally, in the pixel circuit, the first transistor to the 7th transistor is p-type film crystal
Pipe.
Optionally, in the pixel circuit, the first driving line traffic control second transistor and the 5th transistor
On and off, the on and off of the second driving line traffic control the first transistor, third transistor and the 4th transistor, institute
State the on and off of third driving the 7th transistor of line traffic control.
It optionally, further include the second capacitor in the pixel circuit, second capacitor is connected to described
Between two driving lines and second node, for improving the grid voltage of the 6th transistor.
Optionally, in the pixel circuit, the 6th transistor is as driving transistor, the 6th transistor
It is provided to data voltage that the electric current of the Organic Light Emitting Diode is provided by the data line and the third power supply provides
Reference voltage determine, and with first power supply provide the first supply voltage, second source provide second source voltage with
And the 6th transistor threshold voltage it is unrelated.
Correspondingly, the present invention also provides a kind of driving method of pixel circuit, the driving method packet of the pixel circuit
Include first time period, second time period, third period and the 4th period, wherein
In first time period, the driving signal that the first driving line provides keeps low level, the driving that the second driving line provides
Signal becomes low level from high level, and the driving signal that third driving line provides becomes high level, write-in data letter from low level
Number, while second node is initialized；
In second time period, the driving signal that the first driving line provides becomes high level from low level, and the second driving line mentions
The driving signal of confession remains low level, and the driving signal that third driving line provides remains high level, and stopping initialization is simultaneously right
The threshold voltage of 6th transistor is sampled；
In the third period, the driving signal that the first driving line provides keeps high level, the driving that the second driving line provides
Signal becomes high level from low level, and the driving signal that third driving line provides remains high level, stops write-in data-signal；
In the 4th period, the driving signal that the first driving line and third driving line provide becomes low level from high level,
The driving signal that second driving line provides remains high level, by the 6th transistor output current to drive the organic light emission
LED lighting.
Optionally, in the driving method of the pixel circuit, while being initialized to second node, to institute
The anode for stating Organic Light Emitting Diode is initialized.
Correspondingly, the organic light emitting display includes institute as above the present invention also provides a kind of organic light emitting display
The pixel circuit stated.
In pixel circuit provided by the invention and its driving method and organic light emitting display, make in the pixel circuit
The data voltage and third power supply provided by the electric current that the 6th transistor of driving element exports by data line provides initial
Change voltage to determine, and unrelated with the external threshold voltage of supply voltage and the 6th transistor, thus can be avoided by
Brightness disproportionation caused by threshold voltage deviation and IR change in pressure drop, using the pixel circuit and its organic hair of driving method
Optical display unit can show the image with uniform luminance.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the pixel circuit of the organic light emitting display of the prior art；
Fig. 2 is the structural schematic diagram of the pixel circuit of the embodiment of the present invention one；
Fig. 3 is the timing diagram of the driving method of the pixel circuit of the embodiment of the present invention one；
Fig. 4 is the structural schematic diagram of the pixel circuit of the embodiment of the present invention two.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to a kind of pixel circuit proposed by the present invention and its driving method and organic
Active display is described in further detail.According to following explanation and claims, advantages and features of the invention will be more clear
Chu.It should be noted that attached drawing is all made of very simplified form and using non-accurate ratio, only to conveniently, lucidly
Aid in illustrating the purpose of the embodiment of the present invention.
[embodiment one]
Referring to FIG. 2, its structural schematic diagram for the pixel circuit of the embodiment of the present invention one.The pixel circuit 20 wraps
It includes:
The first transistor M1 is connected between third node N3 and fourth node N4, and grid is connected to the second driving line
S2；
Second transistor M2 is connected between fourth node N4 and the anode of Organic Light Emitting Diode OLED, and grid connects
It is connected to the first driving line S1；
Third transistor M3 is connected between second node N2 and third node N3, and grid is connected to the second driving line S2；
4th transistor M4 is connected between data line DATA and first node N1, and grid is connected to the second driving line
S2；
5th transistor M5 is connected between third power supply VREF and third node N3, and grid is connected to the first driving
Line S1；
6th transistor M6 is connected between the first power supply ELVDD and fourth node N4, and grid is connected to second node
N2；
7th transistor M7 is connected between first node N1 and third node N3, and grid is connected to third driving line
S3；
Storage C1 is connected between first node N1 and second node N2；And
Organic Light Emitting Diode OLED, anode are connect with the drain electrode of the second transistor M2, cathode and the second electricity
Source ELVSS connection.
Specifically, the first power supply ELVDD is high potential pixel power, the second source ELVSS is low potential picture
Plain power supply, the first power supply ELVDD and second source ELVSS are used as the driving power of the Organic Light Emitting Diode OLED.
It should be appreciated that high potential pixel power herein is that is, described first power supply for low potential pixel power herein
The potential of ELVDD is relative to second source ELVSS higher, and the potential of the second source ELVSS is relative to the first power supply ELVDD
It is lower.For third power supply VREF for providing reference voltage Vref, the reference voltage Vref is the DC voltage with fixed value.
In the present embodiment, the reference voltage Vref is less than or equal to the data voltage Vdata that data line DATA is provided.
As shown in Fig. 2, the pixel circuit 20 is a kind of 7T1C type circuit structure, including 7 transistors and 1 capacitor
Device.Wherein, storage C1 is connected between first node N1 and second node N2, for storing data signal, and the 6th is brilliant
Driving transistor of the body pipe M6 as pixel controls offer corresponding to the voltage of second node N2 to Organic Light Emitting Diode
The driving current of OLED, the Organic Light Emitting Diode OLED issue the light of corresponding brightness according to the driving current, thus aobvious
Diagram picture, other transistors are switching transistor.
In the present embodiment, the first transistor M1 to the 7th transistor M7 is P-type TFT.
With continued reference to FIG. 2, the pixel circuit 20 controls the crystalline substance of second transistor M2 and the 5th by the first driving line S1
The on and off of body pipe M5 controls the first transistor M1, third transistor M3 and the 4th transistor by the second driving line S2
The on and off of M4 drives line S3 to control the on and off of the 7th transistor M7 by third, and described first drives line S1
For controlling the transmission of initialization voltage, the second driving line S2 is used to control write-in and the driving transistor threshold of data voltage
The sampling of threshold voltage, the third driving line S3 are used to initialize and stablize the voltage of first node N1.
When the driving signal that the first driving line S1 is provided transits to low level, second transistor M2 and the 5th transistor M5
It is both turned on, at this point, the initialization voltage Vref that third power supply VREF is provided is applied to third node N3 by the 5th transistor M5.
When the driving signal that the second driving line S2 is provided transits to low level, the first transistor M1, third transistor M3
It is both turned on the 4th transistor M4, the data-signal that data line DATA is provided is provided to first node via the 4th transistor M4
N1。
When the driving signal that third driving line S3 is provided transits to low level, the 7th transistor M7 conducting, third power supply
The initialization voltage Vref that VREF is provided is applied to first node N1 by the 5th transistor M5 and the 7th transistor M7.
In the present embodiment, the 6th transistor M6 is provided to the driving current of the Organic Light Emitting Diode OLED by data line
DATA provide data voltage Vdata and third power supply VREF provide initialization voltage Vref determine, and with the first power supply
The second source voltage and third transistor M3 that the first supply voltage VDD, the second source ELVSS that ELVDD is provided are provided
Threshold voltage is unrelated.Therefore, even if the threshold voltage of driving transistor deviation occurs or is actually applied to the pixel circuit
20 supply voltage changes, and will not all impact to the electric current for flowing through Organic Light Emitting Diode OLED.Using the picture
Plain circuit 20 can be avoided brightness disproportionation phenomenon, improve the display quality of display.
Correspondingly, the present invention also provides a kind of driving methods of pixel circuit.Incorporated by reference to referring to figs. 2 and 3, the picture
The driving method of plain circuit includes:
Scan period includes first time period T1, second time period T2, third period T3 and the 4th period T4；Its
In,
In first time period T1, the driving signal that the first driving line S1 is provided keeps low level, and the second driving line S2 is provided
Driving signal low level is become from high level, the driving signal that third driving line S3 is provided becomes high level from low level, writes
Enter data-signal, while second node N2 is initialized；
In second time period T2, the driving signal that the first driving line S1 is provided becomes high level, the second driving from low level
The driving signal that line S2 is provided remains low level, and the driving signal that third driving line S3 is provided remains high level, stops just
Beginningization simultaneously samples the threshold voltage of the 6th transistor M6；
In third period T3, the driving signal that the first driving line S1 is provided keeps high level, and the second driving line S2 is provided
Driving signal high level is become from low level, the driving signal that third driving line S3 is provided remains high level, stops write-in
Data-signal；
In the 4th period T4, the driving signal that the first driving line S1 and third driving line S3 are provided becomes low from high level
Level, the driving signal that the second driving line S2 is provided remain high level, export electric current by the 6th transistor M6 to drive
Organic Light Emitting Diode OLED is stated to shine.
Specifically, in first time period T1, since the second driving line S2 driving signal provided becomes low electricity from high level
It is flat, become leading from cut-off by the second driving line S2 the first transistor M1, third transistor M3 and the 4th transistor M4 controlled
Logical, first node N1 is written via the 4th transistor M4 in the data voltage Vdata that data line DATA is provided.At the same time, due to
The driving signal that first driving line S1 is provided keeps low level, and the second transistor M2 and the 5th controlled by the first driving line S1 is brilliant
Body pipe M5 is on state, and the initialization voltage Vref that third power supply VREF is provided is brilliant via the 5th transistor M5 and third
Body pipe M3 is provided to second node N2 (i.e. the grid of the 6th transistor M6), while the initialization voltage that third power supply VREF is provided
Vref is provided to the sun of Organic Light Emitting Diode OLED via the 5th transistor M5, the first transistor M1 and second transistor M2
Pole.
First time period T1 is initialization time section, during this period using third power supply VREF respectively to organic light-emitting diodes
The grid of the anode of pipe OLED and the 6th transistor M6 are initialized, and extend Organic Light Emitting Diode OLED's by initialization
Service life, while the stress of the 6th transistor M6 grid voltage is reduced, it is ready for the write-in of next time series data.
After initialization, the voltage of the second node N2 is Vref.
In second time period T2, since the first driving line S1 driving signal provided becomes high level from low level, by the
The second transistor M2 and the 5th transistor M5 of one driving line S1 control are become ending from conducting, what third power supply VREF was provided
Initialization voltage Vref can not initialize second node N2 and fourth node N4 via the 5th transistor M5, due to second
The driving signal that driving line S2 is provided remains low level, the first transistor M1, the third crystal controlled by the second driving line S2
Pipe M3 and the 4th transistor M4 is on state, and the data voltage Vdata that data line DATA is provided is continued on through by the 4th crystalline substance
First node N1 is written in body pipe M4.
Second time period T2 is programming time section, the corresponding voltage of the data-signal for during this period providing data line DATA
It is stored in storage C1.At this point, the voltage of first node N1 is Vdata, the voltage of second node N2 is VDD- | Vth
|.Wherein, Vth is the threshold voltage of the 6th transistor M6.
In third period T3, since the second driving line S2 driving signal provided becomes high level from low level, by the
The first transistor M1, third transistor M3 and the 4th transistor M4 of two driving line S2 controls are become ending from conducting, data
The data voltage Vdata that line DATA is provided, which can not be continued on through, is written first node N1 by the 4th transistor M4.Simultaneously because first
The driving signal that driving line S1 and third driving line S3 are provided remains high level, the second crystal controlled by the first driving line S1
Pipe M2 and the 5th transistor M5 and the 7th transistor M7 for being driven line S3 to be controlled by third continues to keep off state, first segment
The voltage of point N1 and second node N2 remain unchanged.At this point, the voltage of first node N1 is Vdata, the voltage of second node N2
For VDD- | Vth |.
In the 4th period T4, since the first driving line S1 and third drive the driving signal of line S3 offer by high level
Become low level, drives line by the first driving line S1 second transistor M2 controlled and the 5th transistor M5 conducting and by third
7th transistor M7 of S3 control is become being connected from cut-off, and the initialization voltage Vref that third power supply VREF is provided is via the 5th
Transistor M5 and the 7th transistor M7 is provided to first node N1, and the voltage of first node N1 becomes Vref from Vdata.Due to depositing
The electricity of the coupling of storage container C1, first node N1 and second node N2 remain unchanged, so the electricity of second node N2
Buckling is VDD- | Vth |+(Vref-Vdata).Simultaneously because second transistor M2 is connected, the 6th transistor M6 has been connected to
Machine light emitting diode OLED, the 6th transistor M6 provide driving current to Organic Light Emitting Diode OLED.
4th period T4 is fluorescent lifetime section, and Organic Light Emitting Diode OLED launches light corresponding with driving current.
At this point, the source voltage of the 6th transistor M6 is VDD, the grid voltage of the 6th transistor M6 is equal to the voltage of second node N2,
That is VDD- | Vth |+(Vref-Vdata).Therefore, the source gate voltage Vsg of the 6th transistor M6 (the i.e. described 6th transistor M6's
Voltage difference between source electrode and grid) calculation formula are as follows:
Vsg=VDD- (VDD- | Vth |+(Vref-Vdata)) formula 1；
Flow through the calculation formula of the electric current Ion of the Organic Light Emitting Diode OLED are as follows:
Ion=K × and (Vsg- | Vth |)2Formula 2；
Wherein, K is electron mobility, breadth length ratio, the product of unit-area capacitance three of transistor.
It can be obtained according to formula 1 and formula 2:
Ion=K × (Vdata-Vref)2Formula 3；
Expression formula based on formula 3 is it is found that flow through Ion, the electric current and data voltage of the Organic Light Emitting Diode OLED
Vdata, initialization voltage Vref and constant K are related, brilliant with the second source ELVSS second source voltage provided and the 6th
The threshold voltage vt h of body pipe M6 and the first supply voltage VDD are not related.Therefore, even if the threshold value electricity of the 6th transistor M6
Deviation occurs in pressure Vth or supply voltage VDD changes all will not be to the electric current for flowing through the Organic Light Emitting Diode OLED
Ion is impacted.Therefore, it can be avoided the threshold voltage by thin film transistor (TFT) using the pixel circuit 20 and its driving method
Brightness disproportionation caused by deviation and mains voltage variations, and then improve the display quality of display.That is, the pixel
Circuit 20 compensates for the variation and IR change in pressure drop of threshold voltage.
Moreover, the pixel circuit 20 complete compensation during, to driving transistor grid voltage and organic hair
The anode voltage of optical diode OLED is initialized, and slows down driving transistor and Organic Light Emitting Diode OLED declines
Subtract, extends the display life of entire screen body.
The course of work of first time period T1, second time period T2, third period T3 and the 4th period T4 are repeated, it is complete
At image display function.
[embodiment two]
Referring to FIG. 4, its structural schematic diagram for the pixel circuit of the embodiment of the present invention two.The pixel circuit 30 wraps
It includes:
The first transistor M1 is connected between third node N3 and fourth node N4, and grid is connected to the second driving line
S2；
Second transistor M2 is connected between fourth node N4 and the anode of Organic Light Emitting Diode OLED, and grid connects
It is connected to the first driving line S1；
Third transistor M3 is connected between second node N2 and third node N3, and grid is connected to the second driving line S2；
4th transistor M4 is connected between data line DATA and first node N1, and grid is connected to the second driving line
S2；
5th transistor M5 is connected between third power supply VREF and third node N3, and grid is connected to the first driving
Line S1；
6th transistor M6 is connected between the first power supply ELVDD and fourth node N4, and grid is connected to second node
N2；
7th transistor M7 is connected between first node N1 and third node N3, and grid is connected to third driving line
S3；
Storage C1 is connected between first node N1 and second node N2；
Second capacitor C2 is connected between the driving of second node N2 and second line S2；And
Organic Light Emitting Diode OLED, anode are connect with the drain electrode of the second transistor M2, cathode and the second electricity
Source ELVSS connection.
Specifically, as shown in figure 4, the pixel circuit 30 is a kind of 7T2C type circuit structure, including 7 transistors and 2
A capacitor.
The present embodiment and embodiment one the difference is that: the pixel circuit 30 further includes the second capacitor C2, institute
It states the second capacitor C2 to be connected between the driving of second node N2 and second line S2, for improving the grid electricity of the 6th transistor M6
Pressure, and then reduce the leakage current of the 6th transistor M6.Had using the organic light emitting display of the pixel circuit 30 higher
Contrast, display performance are more preferable.
Correspondingly, the organic light emitting display includes institute as above the present invention also provides a kind of organic light emitting display
The pixel circuit stated.It specifically please refers to above, details are not described herein again.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment emphasis is said
Bright is the difference from other embodiments, and same or similar part may refer to each other between each embodiment.
To sum up, in pixel circuit provided by the invention and its driving method and organic light emitting display, the pixel electricity
The data voltage and third power supply that the electric current that the 6th transistor in road as driving element is exported is provided by data line provide
Initialization voltage determine, it is and unrelated with the external threshold voltage of supply voltage and the 6th transistor, therefore can
The brightness disproportionation as caused by threshold voltage deviation and IR change in pressure drop is avoided, using the pixel circuit and its driving method
Organic light emitting display can show the image with uniform luminance.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (10)
1. a kind of pixel circuit characterized by comprising
The first transistor is connected between third node and fourth node, and grid is connected to the second driving line；
Second transistor is connected between fourth node and the anode of Organic Light Emitting Diode, and grid is connected to the first driving
Line；
Third transistor is connected between second node and third node, and grid is connected to the second driving line；
4th transistor, is connected between data line and first node, and grid is connected to the second driving line；
5th transistor is connected between third power supply and third node, and grid is connected to the first driving line；
6th transistor is connected between the first power supply and fourth node, and grid is connected to second node；
7th transistor is connected between first node and third node, and grid is connected to third driving line；
Storage is connected between first node and second node；And
Organic Light Emitting Diode, anode are connect with the drain electrode of the second transistor, and cathode is connect with second source.
2. pixel circuit as described in claim 1, which is characterized in that first power supply is high potential pixel power, described
Second source is low potential pixel power, the driving electricity of first power supply and second source as the Organic Light Emitting Diode
Source.
3. pixel circuit as described in claim 1, which is characterized in that the third power supply is described for providing reference voltage
Reference voltage is less than or equal to the data voltage that the data line provides.
4. pixel circuit as described in claim 1, which is characterized in that the first transistor to the 7th transistor is p-type
Thin film transistor (TFT).
5. pixel circuit as described in claim 1, which is characterized in that the first driving line traffic control second transistor and the 5th
The on and off of transistor, the conducting of the second driving the line traffic control the first transistor, third transistor and the 4th transistor
And cut-off, the on and off of third driving the 7th transistor of line traffic control.
6. pixel circuit as described in claim 1, which is characterized in that further include the second capacitor, second capacitor connects
It connects between the second driving line and second node, for improving the grid voltage of the 6th transistor.
7. pixel circuit as described in claim 1, which is characterized in that the 6th transistor is described as driving transistor
6th transistor is provided to the data voltage and the third that the electric current of the Organic Light Emitting Diode is provided by the data line
The second of the first supply voltage, second source offer that the reference voltage that power supply provides is determined, and provided with first power supply
The threshold voltage of supply voltage and the 6th transistor is unrelated.
8. a kind of driving method of the pixel circuit as described in any one of claims 1 to 7, which is characterized in that the scan period
Including first time period, second time period, third period and the 4th period, wherein
In first time period, the driving signal that the first driving line provides keeps low level, the driving signal that the second driving line provides
Low level is become from high level, the driving signal that third driving line provides becomes high level from low level, data-signal is written, together
When second node is initialized；
In second time period, the driving signal that the first driving line provides becomes high level from low level, what the second driving line provided
Driving signal remains low level, and the driving signal that third driving line provides remains high level, continues to write to the data letter
Number, stop initializing and sampling the threshold voltage of the 6th transistor；
In the third period, the driving signal that the first driving line provides keeps high level, the driving signal that the second driving line provides
High level is become from low level, the driving signal that third driving line provides remains high level, stops write-in data-signal；
In the 4th period, driving signal that the first driving line and third driving line provide becomes low level from high level, and second
The driving signal that driving line provides remains high level, by the 6th transistor output current to drive the organic light-emitting diodes
Pipe shines.
9. the driving method of pixel circuit as claimed in claim 8, which is characterized in that is initialized to second node
Meanwhile the anode of the Organic Light Emitting Diode is initialized.
10. a kind of organic light emitting display characterized by comprising the pixel electricity as described in any one of claims 1 to 7
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510889502.9A CN106856087B (en) | 2015-12-07 | 2015-12-07 | Pixel circuit and its driving method and organic light emitting display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510889502.9A CN106856087B (en) | 2015-12-07 | 2015-12-07 | Pixel circuit and its driving method and organic light emitting display |
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| Publication Number | Publication Date |
|---|---|
| CN106856087A CN106856087A (en) | 2017-06-16 |
| CN106856087B true CN106856087B (en) | 2019-03-08 |
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| CN108564920B (en) * | 2018-04-26 | 2019-11-05 | 上海天马有机发光显示技术有限公司 | A kind of pixel circuit and display device |
| CN110070830B (en) * | 2019-04-19 | 2021-08-06 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN110176214B (en) * | 2019-05-29 | 2020-11-03 | 昆山龙腾光电股份有限公司 | Pixel driving circuit and organic electroluminescent display |
| CN111402809B (en) * | 2020-05-27 | 2022-05-17 | 武汉天马微电子有限公司 | Display panel and display device |
| CN111710297B (en) * | 2020-06-22 | 2022-03-11 | 昆山国显光电有限公司 | Pixel driving circuit, driving method thereof and display panel |
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| CN103021333A (en) * | 2012-12-11 | 2013-04-03 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit of organic light emitting display and driving method of pixel circuit |
| CN104050917A (en) * | 2014-06-09 | 2014-09-17 | 上海天马有机发光显示技术有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
| CN104464607A (en) * | 2013-09-17 | 2015-03-25 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit of organic luminescence display, and driving method thereof |
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| JP2005202070A (en) * | 2004-01-14 | 2005-07-28 | Sony Corp | Display device and pixel circuit |
| KR101097325B1 (en) * | 2009-12-31 | 2011-12-23 | 삼성모바일디스플레이주식회사 | A pixel circuit and a organic electro-luminescent display apparatus |
| KR101682690B1 (en) * | 2010-07-20 | 2016-12-07 | 삼성디스플레이 주식회사 | Pixel and Organic Light Emitting Display Device Using the same |
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| CN103021333A (en) * | 2012-12-11 | 2013-04-03 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit of organic light emitting display and driving method of pixel circuit |
| CN104464607A (en) * | 2013-09-17 | 2015-03-25 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit of organic luminescence display, and driving method thereof |
| CN104050917A (en) * | 2014-06-09 | 2014-09-17 | 上海天马有机发光显示技术有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
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