CN108735152A - Driving circuit, pixel circuit, its driving method and display device - Google Patents
Driving circuit, pixel circuit, its driving method and display device Download PDFInfo
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- CN108735152A CN108735152A CN201810524833.6A CN201810524833A CN108735152A CN 108735152 A CN108735152 A CN 108735152A CN 201810524833 A CN201810524833 A CN 201810524833A CN 108735152 A CN108735152 A CN 108735152A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
Abstract
The present invention relates to a kind of driving circuit, pixel circuit, its driving method and display device, which includes transistor M1, transistor M2, transistor M3, transistor M4, transistor M5, transistor M6 and capacitance C1.The driving circuit is in the initial phase, the data-signal flows through the anode that the transistor M4, the transistor M6, the transistor M5, the transistor M3 are added in the Organic Light Emitting Diode OLED, to initialize the anode voltage of Organic Light Emitting Diode OLED.The data-signal flows through the transistor M4, the transistor M5 is added on the substrate of capacitance C1, so that the dump energy electric discharge that previous frame picture point time is stored in capacitance C1 is eliminated, avoids different so as to cause last driving current to making a difference to threshold voltage sampling in the current frame pixel time.
Description
Technical field
The present invention relates to OLED pixel drive areas, more particularly to a kind of driving circuit, pixel circuit, its driving method
And display device.
Background technology
Organic light emitting display be a kind of application Organic Light Emitting Diode (Organic Light-Emitting Diode,
OLED) as the display of luminescent device, Thin Film Transistor-LCD (Thin Film Transistor- are compared
Liquid Crystal Display, TFT-LCD), have many advantages, such as that high contrast, wide viewing angle, low-power consumption, volume are thin.
The brightness of OLED is the electric current generated by driving thin film transistor (TFT) (Thin Film Transistor, TFT) circuit
Size determines.
Traditional technology is mainly by introducing the means of new TFT to realize the initialization of OLED and capacitance, such as 7T1C pictures
Plain driving circuit or 8T1C pixel-driving circuits.And 6T1C pixel-driving circuits cannot achieve OLED current initialization.
Invention content
Based on this, it is necessary to cannot achieve the skill of OLED current initialization for 6T1C pixel-driving circuits in traditional technology
Art problem provides a kind of driving circuit, pixel circuit, its driving method and display device.
A kind of driving circuit, for driving Organic Light Emitting Diode OLED, including：Transistor M1, transistor M2, transistor
M3, transistor M4, transistor M5, transistor M6, capacitance C1；The control terminal of the transistor M4 is for inputting the first scanning letter
Number, the first pole of the transistor M4 is used for input data signal, and the second pole of the transistor M4 connects the transistor M6's
First pole；For the control terminal of the transistor M6 for inputting the second scanning signal, the second pole of the transistor M6 connects the crystalline substance
The second pole of body pipe M5；The first pole of the transistor M5 connects the first pole and the second of the transistor M2 of the transistor M3
Pole, the control terminal of the transistor M5 is for inputting the first scanning signal；The first pole of the transistor M2 connects the transistor
Second pole of the second pole of M1 and the transistor M4, the control of the transistor M2 terminate the second pole of the transistor M5 with
The one end the capacitance C1, another termination power supply signal VDD of the capacitance C1；The control terminal of the transistor M1 is for defeated
Enter third scanning signal, the first pole of the transistor M1 meets the power supply signal VDD；The control terminal of the transistor M3 is used for
The 4th scanning signal is inputted, the second pole of the transistor M3 is used to connect the input terminal of the Organic Light Emitting Diode OLED.
The transistor M1, the transistor M3, the transistor M4, the transistor in one of the embodiments,
The breadth length ratio of M5 and the transistor M6 are equal.
The transistor M1, the transistor M2, the transistor M3, the transistor in one of the embodiments,
M4, the transistor M5 and the transistor M6 are low-temperature polysilicon film transistor, oxide semiconductor thin-film transistor
And any one of amorphous silicon film transistor.
The transistor M1, the transistor M2, the transistor M3, the transistor in one of the embodiments,
M4, the transistor M5 and the transistor M6 are P-type TFT.
A kind of pixel circuit based on the driving circuit in any of the above-described embodiment, including：Transistor M1, transistor
M2, transistor M3, transistor M4, transistor M5, transistor M6, capacitance C1 and Organic Light Emitting Diode OLED；The transistor
The control terminal of M4 is used for input data signal, the crystal for inputting the first scanning signal, the first pole of the transistor M4
The second pole of pipe M4 connects the first pole of the transistor M6；The control terminal of the transistor M6 is used to input the second scanning signal,
The second pole of the transistor M6 connects the second pole of the transistor M5；The first pole of the transistor M5 meets the transistor M3
The first pole and the transistor M2 the second pole, the control terminal of the transistor M5 is for inputting the first scanning signal；It is described
The first pole of transistor M2 connects the second pole of the second pole and the transistor M4 of the transistor M1, the control of the transistor M2
System terminates the second pole and the one end the capacitance C1 of the transistor M5, another termination power supply signal of the capacitance C1
VDD；The control terminal of the transistor M1 connects the power supply letter for inputting third scanning signal, the first pole of the transistor M1
Number VDD；The control terminal of the transistor M3 connects described organic for inputting the 4th scanning signal, the second pole of the transistor M3
The input terminal of light emitting diode OLED；The output termination power ground VSS of the Organic Light Emitting Diode OLED.
A kind of driving method, the driving method include successively based on the driving circuit in any of the above-described embodiment：
Initial phase, first scanning signal, second scanning signal end, the 4th scanning signal and described
Data-signal is low level signal, and the third scanning signal is high level signal, in the initial phase, the data
Signal, for initializing the driving circuit；
Memory phase, first scanning signal are low level signal, second scanning signal, third scanning letter
Number, the 4th scanning signal and the data-signal be high level signal；
Glow phase, first scanning signal, second scanning signal and the data-signal are high level letter
Number, the third scanning signal and the 4th scanning signal are low level signal.
A kind of driving method of pixel circuit, the driving method based on the pixel circuit in above-described embodiment, according to
It is secondary to include：
Initial phase, first scanning signal, second scanning signal, the 4th scanning signal and the number
It is believed that number being low level signal, the third scanning signal is high level signal, in the initial phase, the data letter
Number, for initializing the Organic Light Emitting Diode OLED and resetting the capacitance C1；
Memory phase, first scanning signal are low level signal, second scanning signal, third scanning letter
Number, the 4th scanning signal and the data-signal be high level signal, the data-signal, for writing offset voltage
Enter the capacitance C1；
Glow phase, first scanning signal, second scanning signal and the data-signal are high level letter
Number, the third scanning signal and the 4th scanning signal are low level signal, the power supply signal, for being supplied to
Organic Light Emitting Diode OLED is stated so that the Organic Light Emitting Diode OLED shines.
A kind of display device, including：Scanner driver, for applying scanning signal to scan line；Data driver is used for
Apply data-signal to data line；Pixel circuit is connected between scan line and data line, and the pixel circuit includes crystal
Pipe M1, transistor M2, transistor M3, transistor M4, transistor M5, transistor M6, capacitance C1 and Organic Light Emitting Diode OLED；
The control terminal of the transistor M4 is believed for inputting the first scanning signal, the first pole of the transistor M4 for input data
Number, the second pole of the transistor M4 connects the first pole of the transistor M6；The control terminal of the transistor M6 is for inputting the
Two scanning signals, the second pole of the transistor M6 connect the second pole of the transistor M5；The first pole of the transistor M5 connects
The control terminal of second pole of the first pole of the transistor M3 and the transistor M2, the transistor M5 is swept for inputting first
Retouch signal；The first pole of the transistor M2 connects the second pole of the second pole and the transistor M4 of the transistor M1, described
The control of transistor M2 terminates the second pole and the one end the capacitance C1 of the transistor M5, another termination institute of the capacitance C1
State power supply signal VDD；For inputting third scanning signal, the first pole of the transistor M1 connects the control terminal of the transistor M1
The power supply signal VDD；The control terminal of the transistor M3 is for inputting the 4th scanning signal, the second pole of the transistor M3
Connect the input terminal of the Organic Light Emitting Diode OLED；The output termination power ground VSS of the Organic Light Emitting Diode OLED.
Transistor M4, the transistor M5 described in the transistor M1, the transistor M3 in one of the embodiments,
And the breadth length ratio of the transistor M6 is equal.
The transistor M1, the transistor M2, the transistor M3, the transistor in one of the embodiments,
M4, the transistor M5 and the transistor M6 be low-temperature polysilicon film transistor, oxide semiconductor thin-film transistor with
And any one of amorphous silicon film transistor.
Above-mentioned driving circuit, pixel circuit, its driving method and display device, the driving circuit, for driving organic hair
Optical diode OLED, including：Transistor M1, transistor M2, transistor M3, transistor M4, transistor M5, transistor M6, capacitance
C1.By the way that in initial phase, data-signal flows through transistor M4, transistor M6, transistor M5, transistor M3 and is added in organic hair
The anode of optical diode OLED, realizes the initialization of the anode of Organic Light Emitting Diode OLED, data-signal flow through transistor M4,
Transistor M5 is added on the substrate of capacitance C1, is reset for capacitance.
Description of the drawings
Fig. 1 is the circuit diagram of the driving circuit in the application one embodiment；
Fig. 2 is the circuit diagram of the driving circuit using P-type TFT in the application one embodiment；
Fig. 3 is the sequence diagram of driving method in the application one embodiment；
Fig. 4 is the circuit diagram of pixel circuit in the application one embodiment；
Fig. 5 is the simulation result schematic diagram that voltage is reset in the application one embodiment.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.Many details are elaborated in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case of violating intension of the present invention, therefore the present invention is not limited by following public specific embodiment.
In one embodiment, Fig. 1 is referred to, the application provides a kind of driving circuit, for driving organic light-emitting diodes
Pipe OLED.The driving circuit includes：Transistor M1, transistor M2, transistor M3, transistor M4, transistor M5, transistor M6,
Capacitance C1.Wherein, transistor M1 to M6 includes control terminal, the first pole 1 and the second pole 2.The control terminal of transistor M4 is connected to
First scanning end S1, for inputting the first scanning signal.The first pole of transistor M4 is used for input data signal.Transistor M4's
Second pole connects the first pole of transistor M6.The control terminal of transistor M6 is connected to the second scanning end S2, for inputting the second scanning
Signal.The second pole of transistor M6 connects the second pole of transistor M5, the first pole of transistor M5 connect the first pole of transistor M3 with
The control terminal of the second pole of transistor M2, transistor M5 is connected to the first scanning end S1, for inputting the first scanning signal.Crystal
The first pole of pipe M2 connects the second pole of transistor M1 and the second pole of transistor M4.The control termination transistor M5's of transistor M2
Second pole and the one end capacitance C1, another termination power supply signal VDD of capacitance C1.The control terminal of transistor M1 is connected to third scanning
S3 is held, for inputting third scanning signal.The first pole of transistor M1 meets power supply signal VDD.The control terminal of transistor M3 connects
To the 4th scanning end S4, for inputting the 4th scanning signal.The second pole of transistor M3 is for connecting Organic Light Emitting Diode
The input terminal of OLED.
In the present embodiment, transistor M1, transistor M3, transistor M4, transistor M5 and transistor M6 are driving circuits
In switching transistor.Transistor M2 is the driving transistor in driving circuit.Capacitance C1 is storage capacitor, is connected to transistor
Between the control terminal of M2 and the first pole of transistor M1.First scanning signal controlling transistor M4, transistor M5 shutdown or
Conducting, the shutdown or conducting of the second scanning signal controlling transistor M2, transistor M6.Third scanning signal controlling transistor M1
Shutdown or conducting.The shutdown or conducting of 4th scanning signal controlling transistor M3.When transistor M4, transistor M6, crystalline substance
When body pipe M5, transistor M2, transistor M3 conductings, data voltage Vdata flows through transistor M4, transistor M6, transistor M5, crystalline substance
Body pipe M3 is added in the anode of OLED, to initialize the anode voltage of Organic Light Emitting Diode OLED.Meanwhile data voltage
Vdata flows through transistor M4, transistor M5 is added in the grid of driving transistor M2, and previous frame picture point time is made to be stored in capacitance C1
In dump energy electric discharge eliminate, avoid in the current frame pixel time to threshold voltage sampling make a difference so as to cause last
Driving current it is different.
In one embodiment, the breadth length ratio of transistor M1, transistor M3, transistor M4, transistor M5 and transistor M6
It is equal.It in this way can be to avoid the Organic Light Emitting Diode OLED brightness irregularities caused by the size difference of switching transistor
The inaccurate technical problem with gray scale.
In one embodiment, transistor M1, transistor M2, transistor M3, transistor M4, transistor M5 and transistor M6
For any one of low-temperature polysilicon film transistor, oxide semiconductor thin-film transistor and amorphous silicon film transistor.
P-type TFT may be used in transistor M1, transistor M2, transistor M3, transistor M4, transistor M5 and transistor M6,
N-type TFT can also be used.When using P-type TFT as transistor types in driving circuit, to need
The control terminal input low level signal for the transistor to be connected；In use N-type TFT as the crystal in pixel circuit
When tubing type, to the control terminal input high level signal for the transistor that needs are connected.
In one embodiment, refer to Fig. 2, transistor M1 that driving circuit provided by the present application uses, transistor M2,
Transistor M3, transistor M4, transistor M5 and transistor M6 are P-type TFT.It is possible to understand, control
End can be the grid of transistor M1 to M6, and first extremely can be the source electrode of transistor M1 to M6, and second extremely can be transistor
The drain electrode of M1 to M6.
In one embodiment, the application provides the driving method based on the driving circuit in any of the above-described embodiment, should
Driving method includes successively：
Initial phase T1, the first scanning signal, the second scanning signal, the 4th scanning signal and data-signal are low electricity
Ordinary mail number, third scanning signal are high level signal.In initial phase T1, data-signal can initialize driving circuit.
Memory phase T2, the first scanning signal are low level signal, and the second scanning signal, third scanning signal, the 4th sweep
It is high level signal to retouch signal and data-signal.
Glow phase T3, the first scanning signal, the second scanning signal and data-signal are high level signal, third scanning
Signal and the 4th scanning signal are low level signal.
Fig. 3 is referred to, Fig. 3 is the corresponding signal timing diagram of the driving method, wherein signal timing diagram includes initialization rank
Section T1, memory phase T2 and glow phase T3.Specifically the course of work is as follows：
In initial phase T1, the first scanning signal, the second scanning signal, the 4th scanning signal and data-signal are low
Level signal.Transistor M4, transistor M5, transistor M6, transistor M2, transistor M3 are both turned on.Third scanning signal is height
Level signal, transistor M1 shutdowns.Then data-signal can initialize the grid of transistor M2 in driving circuit, and be capacitance
C1 is reset.
In memory phase T2, the first scanning signal is low level signal, transistor M4, transistor M5 conductings.Second scanning
Signal, third scanning signal, the 4th scanning signal and data-signal are high level signal, transistor M6, transistor M1, crystal
Pipe M3 shutdowns.Data-signal flows through the first pole that transistor M4 is added in transistor M2, and transistor M2 conductings correspond to data-signal
Voltage store to the capacitance C1 being connect with the control terminal of transistor M2.
In glow phase T3, the first scanning signal, the second scanning signal and data-signal are high level signal, transistor
M4, transistor M5, transistor M6 are respectively turned off.Third scanning signal and the 4th scanning signal are low level signal, transistor
M1, transistor M3 conductings.Capacitance C1 keeps the grid voltage of transistor M2, driving transistor M2 to open.Power supply signal VDD is from crystalline substance
The first pole of body pipe M1 inputs, and electric current is through transistor M1, transistor M2 and transistor M3 so that Organic Light Emitting Diode OLED hairs
Light.
In one embodiment, Fig. 4 is referred to, the application provides a kind of driving circuit based in any of the above-described embodiment
Pixel circuit, which includes transistor M1, transistor M2, transistor M3, transistor M4, transistor M5, transistor
M6, capacitance C1 and Organic Light Emitting Diode OLED.
Wherein, the control terminal of transistor M4 is for inputting the first scanning signal, and the first pole of transistor M4 is for inputting number
It is believed that number, the second pole of transistor M4 connects the first pole of transistor M6.The control terminal of transistor M6 is for inputting the second scanning letter
Number, the second pole of transistor M6 connects the second pole of transistor M5, and the first pole of transistor M5 connects the first pole and the crystalline substance of transistor M3
The second pole of body pipe M2, the control terminal of transistor M5 is for inputting the first scanning signal.The first pole of transistor M2 connects transistor
The second pole of M1 and the second pole of transistor M4, the second pole and the one end capacitance C1 of the control termination transistor M5 of transistor M2,
Another termination power supply signal VDD of capacitance C1.The control terminal of transistor M1 is for inputting third scanning signal, and the of transistor M1
One pole meets power supply signal VDD.For the control terminal of transistor M3 for inputting the 4th scanning signal, the second pole of transistor M3 is connected to machine
The input terminal of light emitting diode OLED.The output termination power ground VSS of Organic Light Emitting Diode OLED.
In one embodiment, the application provides a kind of driving method of pixel circuit, and driving method is based on above-mentioned implementation
Pixel circuit in example, the driving method include successively：
Initial phase T1, the first scanning signal, the second scanning signal, the 4th scanning signal and data-signal are low electricity
Ordinary mail number, third scanning signal are high level signal.Data-signal, for initializing Organic Light Emitting Diode OLED and resetting electricity
Hold C1.
Memory phase T2, the first scanning signal are low level signal, and the second scanning signal, third scanning signal, the 4th sweep
It is high level signal, data-signal, for capacitance C1 to be written in offset voltage to retouch signal and data-signal.
Glow phase T3, the first scanning signal, the second scanning signal and data-signal are high level signal, third scanning
Signal and the 4th scanning signal are low level signal, power supply signal, for being supplied to Organic Light Emitting Diode OLED so as to have
Machine light emitting diode OLED shines.
It is worked with reference to the driving method pixels illustrated circuit of the pixel circuit and pixel circuit in above-described embodiment
Journey.
Reset signal is kept in initial phase T1, data-signal Vdata.First scanning letter of the first scanning end S1 outputs
Number it is low level, transistor M4, transistor M5 conducting.Second scanning signal of the second scanning end S2 outputs is low level, crystal
Pipe M6, transistor M2 conductings.The third scanning signal of third scanning end S3 outputs is high level, transistor M1 shutdowns.4th sweeps
The 4th scanning signal for retouching end S4 outputs is low level, transistor M3 conductings.Then data voltage signal Vdata flows through transistor
M4, transistor M6, transistor M5, transistor M3 are added in the anode of Organic Light Emitting Diode OLED, to initialize organic light emission
The anode voltage of diode OLED reduces the potential barrier between anode and hole transmission layer.Data voltage signal Vdata flows through crystal
Pipe M4, transistor M5 are added in the grid of driving transistor M2, and previous frame picture point time is made to be stored in the dump energy in capacitance C1
Electric discharge is eliminated, and is avoided to making a difference so as to cause last driving current not to threshold voltage sampling in the current frame pixel time
Together.At this point, the third scanning signal of third scanning end S3 is high level, transistor M1 shutdowns.There is no driving current to flow through organic
Light emitting diode OLED, to which it does not shine.
Wherein, Fig. 4 and Fig. 5 are referred to, the voltage at initial phase T1, node NET3 and node NET5 is set to respectively
When being set to -3V respectively for the current potential of -3V and -3V, i.e. capacity substrate and the anode of Organic Light Emitting Diode OLED, it may be implemented
The purpose of clearing.It should be noted that the voltage at node NET3 and node NET5 is properly termed as resetting voltage, in the present embodiment
The voltage value mentioned only is a numerical value for meeting emulation, not as the limitation to the application.Capacitance can be made to reset and will be had
The voltage that machine light emitting diode OLED both end voltages are decreased to less than threshold voltage vt h belongs to the range for resetting voltage.
It is low level, transistor M4, transistor M5 in the first scanning signal of memory phase T2, the first scanning end S1 outputs
Conducting；Second scanning signal of the second scanning end S2 output is low level, transistor M6 shutdowns, the of the S3 outputs of third scanning end
Three scanning signals are high level, transistor M1 shutdowns；4th scanning signal of the 4th scanning end S4 outputs is high level, transistor
M3 is turned off；Data voltage signal Vdata flows through the source electrode that transistor M4 is added in driving transistor M2, and driving transistor M2 is opened.
Data voltage signal Vdata flows through transistor M4, transistor M2, transistor M5, and capacitance C1 is written in offset voltage.
At this point, the grid voltage of transistor M2 is Vdata- | Vth |, wherein Vth is the threshold voltage of transistor M2, and
The value of the threshold voltage is negative value, then the grid voltage Vdata+Vth of transistor M2.
It is high level, transistor M4, transistor M5 in the first scanning signal of glow phase T3, the first scanning end S1 outputs
Shutdown.Second scanning signal of the second scanning end S2 outputs is high level, transistor M6 shutdowns.The of third scanning end S3 output
Three scanning signals are low level, transistor M1 conductings.4th scanning signal of the 4th scanning end S4 outputs is low level, transistor
M3 is connected.Capacitance C1 keeps the grid voltage of transistor M2, driving transistor M2 to open.
At this point, power supply signal VDD is inputted from the source electrode of transistor M1, through transistor M1, the source electrode of transistor M2 is reached, i.e.,
The source voltage of transistor M2 is：Vs=VDD；
The grid voltage of transistor M2 is：Vdata+Vth；
The source gate pressure drop of transistor M2 is：Vsg=Vs-Vg=VDD- (VDATA+Vth)；
Driving current size in transistor M2：I=K* (Vsg+Vth)2=K* (VDD-VDATA)2；Wherein, K=1/2*
μ*Cox*W/L.μ is the electron mobility of thin film transistor (TFT), CoxIt is the gate oxide capacitance of thin film transistor (TFT) unit area, W is
The channel width of thin film transistor (TFT), L are the channel lengths of thin film transistor (TFT).
Therefore, the driving current size that can be obtained in the first transistor T1 is：
I=1/2* μ * Cox*W/L*(VDD-VDATA)2
It can be obtained from above-mentioned formula, the threshold voltage vt h of the driving current size in transistor M2 and transistor M2
Size is unrelated, to realize threshold voltage compensation, driving current is made to become a constant, so that Organic Light Emitting Diode OLED
Brightness stability.
In the present embodiment, simulation result is as shown in the table, by following table it is found that when threshold voltage changes in ± 0.1V or so
When, the change rate of electric current is 0.09%, improves the consistency that screen body is shown.That is, flowing through Organic Light Emitting Diode
The driving current of OLED is not influenced substantially by threshold voltage vt h, realizes the compensation of threshold voltage vt h.
| Threshold voltage (Vth) | Driving current (nA) |
| -1.2 | 74.76 |
| -1.3 | 74.83 |
| -1.4 | 74.851 |
In one embodiment, the application provides a kind of display device, which includes：Scanner driver is used for
Scanning signal is inputted to scan line.Data driver, for applying data-signal to data line.Pixel circuit is connected and sweeps
It retouches between line and data line.Wherein, pixel circuit includes transistor M1, transistor M2, transistor M3, transistor M4, transistor
M5, transistor M6, capacitance C1 and Organic Light Emitting Diode OLED.The control terminal of transistor M4 is used to input the first scanning signal,
The first pole of transistor M4 is used for input data signal, and the second pole of transistor M4 connects the first pole of transistor M6.Transistor M6
Control terminal for inputting the second scanning signal, the second pole of transistor M6 connects the second pole of transistor M5, the of transistor M5
One pole connects the first pole of transistor M3 and the second pole of transistor M2, and the control terminal of transistor M5 is for inputting the first scanning letter
Number.The first pole of transistor M2 connects the second pole of transistor M1 and the second pole of transistor M4, and the control termination of transistor M2 is brilliant
The second pole of body pipe M5 and the one end capacitance C1, another termination power supply signal VDD of capacitance C1.The control terminal of transistor M1 is for defeated
Enter third scanning signal, the first pole of transistor M1 meets power supply signal VDD.The control terminal of transistor M3 is for inputting the 4th scanning
Signal, the second pole of transistor M3 connect the input terminal of Organic Light Emitting Diode OLED.The output end of Organic Light Emitting Diode OLED
Meet power ground VSS.
In one embodiment, transistor M1, transistor M3, transistor M4, crystal in display device provided by the present application
The breadth length ratio of pipe M5 and transistor M6 are equal.It can be filled in this way to avoid the display caused by the size difference of switching transistor
The inaccurate technical problem of the uniform gray scale of brightness disproportionation set.
In one embodiment, transistor M1, transistor M2, transistor M3, crystal in display device provided by the present application
Pipe M4, transistor M5 and transistor M6 are low-temperature polysilicon film transistor, oxide semiconductor thin-film transistor and amorphous
Any one of silicon thin film transistor.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of driving circuit, for driving Organic Light Emitting Diode OLED, which is characterized in that including：Transistor M1, transistor
M2, transistor M3, transistor M4, transistor M5, transistor M6 and capacitance C1；
The control terminal of the transistor M4 is used for input data for inputting the first scanning signal, the first pole of the transistor M4
Signal, the second pole of the transistor M4 connect the first pole of the transistor M6；
For the control terminal of the transistor M6 for inputting the second scanning signal, the second pole of the transistor M6 connects the transistor
The second pole of M5；
The first pole of the transistor M5 connects the second pole of the first pole and the transistor M2 of the transistor M3, the crystal
The control terminal of pipe M5 is for inputting the first scanning signal；
The first pole of the transistor M2 connects the second pole of the second pole and the transistor M4 of the transistor M1, the crystal
The control of pipe M2 terminates the second pole and the one end the capacitance C1 of the transistor M5, another termination electricity of the capacitance C1
Source signal VDD；
The control terminal of the transistor M1 connects the power supply letter for inputting third scanning signal, the first pole of the transistor M1
Number VDD；
For the control terminal of the transistor M3 for inputting the 4th scanning signal, the second pole of the transistor M3 is described for connecting
The input terminal of Organic Light Emitting Diode OLED.
2. driving circuit according to claim 1, which is characterized in that the transistor M1, the transistor M3, the crystalline substance
The breadth length ratio of body pipe M4, the transistor M5 and the transistor M6 are equal.
3. driving circuit according to claim 1, which is characterized in that the transistor M1, the transistor M2, the crystalline substance
Body pipe M3, the transistor M4, the transistor M5 and the transistor M6 are low-temperature polysilicon film transistor, oxide
Any one of semiconductor thin-film transistor and amorphous silicon film transistor.
4. driving circuit according to claim 1, which is characterized in that the transistor M1, the transistor M2, the crystalline substance
Body pipe M3, the transistor M4, the transistor M5 and the transistor M6 are P-type TFT.
5. a kind of pixel circuit based on any driving circuit of Claims 1-4, which is characterized in that including：Transistor
M1, transistor M2, transistor M3, transistor M4, transistor M5, transistor M6, capacitance C1 and Organic Light Emitting Diode OLED；
The control terminal of the transistor M4 is used for input data for inputting the first scanning signal, the first pole of the transistor M4
Signal, the second pole of the transistor M4 connect the first pole of the transistor M6；
For the control terminal of the transistor M6 for inputting the second scanning signal, the second pole of the transistor M6 connects the transistor
The second pole of M5；
The first pole of the transistor M5 connects the second pole of the first pole and the transistor M2 of the transistor M3, the crystal
The control terminal of pipe M5 is for inputting the first scanning signal；
The first pole of the transistor M2 connects the second pole of the second pole and the transistor M4 of the transistor M1, the crystal
The control of pipe M2 terminates the second pole and the one end the capacitance C1 of the transistor M5, another termination electricity of the capacitance C1
Source signal VDD；
The control terminal of the transistor M1 connects the power supply letter for inputting third scanning signal, the first pole of the transistor M1
Number VDD；
For the control terminal of the transistor M3 for inputting the 4th scanning signal, the second pole of the transistor M3 connects organic hair
The input terminal of optical diode OLED；
The output termination power ground VSS of the Organic Light Emitting Diode OLED.
6. a kind of driving method, the driving method is based on any driving circuit of Claims 1-4, which is characterized in that
Include successively：
Initial phase, first scanning signal, second scanning signal end, the 4th scanning signal and the data
Signal is low level signal, and the third scanning signal is high level signal, in the initial phase, the data letter
Number, for initializing the driving circuit；
Memory phase, first scanning signal be low level signal, second scanning signal, the third scanning signal,
4th scanning signal and the data-signal are high level signal；
Glow phase, first scanning signal, second scanning signal and the data-signal are high level signal, institute
It is low level signal to state third scanning signal and the 4th scanning signal.
7. a kind of driving method of pixel circuit, the driving method are existed based on the pixel circuit described in claim 5, feature
In including successively：
Initial phase, first scanning signal, second scanning signal, the 4th scanning signal and data letter
Number it is low level signal, the third scanning signal is high level signal, in the initial phase, the data-signal,
For initializing the Organic Light Emitting Diode OLED and resetting the capacitance C1；
Memory phase, first scanning signal be low level signal, second scanning signal, the third scanning signal,
4th scanning signal and the data-signal are high level signal, the data-signal, for offset voltage to be written
The capacitance C1；
Glow phase, first scanning signal, second scanning signal and the data-signal are high level signal, institute
It is low level signal to state third scanning signal and the 4th scanning signal, the power supply signal, described is had for being supplied to
Machine light emitting diode OLED is so that the Organic Light Emitting Diode OLED shines.
8. a kind of display device, which is characterized in that including：
Scanner driver, for applying scanning signal to scan line；
Data driver, for applying data-signal to data line；
Pixel circuit is connected between scan line and data line, it is characterised in that：
The pixel circuit includes transistor M1, transistor M2, transistor M3, transistor M4, transistor M5, transistor M6, electricity
Hold C1 and Organic Light Emitting Diode OLED；
The control terminal of the transistor M4 is used for input data for inputting the first scanning signal, the first pole of the transistor M4
Signal, the second pole of the transistor M4 connect the first pole of the transistor M6；
For the control terminal of the transistor M6 for inputting the second scanning signal, the second pole of the transistor M6 connects the transistor
The second pole of M5；
The first pole of the transistor M5 connects the second pole of the first pole and the transistor M2 of the transistor M3, the crystal
The control terminal of pipe M5 is for inputting the first scanning signal；
The first pole of the transistor M2 connects the second pole of the second pole and the transistor M4 of the transistor M1, the crystal
The control of pipe M2 terminates the second pole and the one end the capacitance C1 of the transistor M5, another termination electricity of the capacitance C1
Source signal VDD；
The control terminal of the transistor M1 connects the power supply letter for inputting third scanning signal, the first pole of the transistor M1
Number VDD；
For the control terminal of the transistor M3 for inputting the 4th scanning signal, the second pole of the transistor M3 connects organic hair
The input terminal of optical diode OLED；
The output termination power ground VSS of the Organic Light Emitting Diode OLED.
9. display device according to claim 8, which is characterized in that the transistor M1, the transistor M3, the crystalline substance
The breadth length ratio of body pipe M4, the transistor M5 and the transistor M6 are equal.
10. display device according to claim 8, which is characterized in that the transistor M1, the transistor M2, described
Transistor M3, the transistor M4, the transistor M5 and the transistor M6 are low-temperature polysilicon film transistor, oxide
Any one of semiconductor thin-film transistor and amorphous silicon film transistor.
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