CN109003575A - Pixel circuit and its driving method, display base plate - Google Patents
Pixel circuit and its driving method, display base plate Download PDFInfo
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- CN109003575A CN109003575A CN201810949164.7A CN201810949164A CN109003575A CN 109003575 A CN109003575 A CN 109003575A CN 201810949164 A CN201810949164 A CN 201810949164A CN 109003575 A CN109003575 A CN 109003575A
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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]
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Abstract
The present invention provides a kind of pixel circuit and its driving method, display base plate, belong to field of display technology, cannot be considered in terms of high brightness and high contrast both of which when at least partly can solve the problems, such as in the prior art to drive organic light-emitting diode pixel circuit.Pixel circuit of the invention, including the first driving transistor, the second driving transistor, Organic Light Emitting Diode；The grid of the first driving transistor connects the first data terminal, the first pole connects the first power end, and the second pole connects the first pole of the Organic Light Emitting Diode；The grid of the second driving transistor connects the second data terminal, and the first pole connects second source end, and the second pole connects the second pole of the Organic Light Emitting Diode.
Description
Technical field
The invention belongs to field of display technology, and in particular to a kind of pixel circuit, a kind of pixel circuit driving method and
A kind of display base plate.
Background technique
It is general to utilize driving transistor in the pixel circuit in existing Organic Light Emitting Diode (OLED) display panel
(such as silicon substrate driving transistor) removes driving organic light-emitting diode.Simplest circuit can be regarded as driving transistor and have
Machine light emitting diode, which is connected between power supply and ground, (to be connect with Organic Light Emitting Diode anode with driving transistor, minus earth
For), the two is equivalent to two resistance, wherein the equivalent resistance of driving transistor is variable, therefore can be by adjusting driving transistor
Equivalent resistance change its partial pressure, that is, change OLED anode voltage, wherein driving transistor resistance is by its grid source electricity
The voltage difference of pressure difference influences.
Curved relationship between the brightness of light and the voltage difference at its two poles of the earth that Organic Light Emitting Diode issues.Wherein, usually
By changing the voltage of voltage (practical is that gate source voltage is poor) changeable Organic Light Emitting Diode anode of driving transistor gate,
To adjust the voltage difference (because Organic Light Emitting Diode minus earth) between Organic Light Emitting Diode yin-yang the two poles of the earth indirectly,
Namely adjust the brightness of Organic Light Emitting Diode.But since the maximum pressure difference that bears between driving three pole of transistor is limited,
Therefore the adjusting range of the voltage difference between its source and drain the two poles of the earth is limited (i.e. the partial pressure of driving transistor is limited), in power supply
In the case that voltage is fixed, the variation range that will lead to the voltage difference at yin-yang the two poles of the earth of Organic Light Emitting Diode is limited.
It is corresponding to be compared with high brightness and height according to the relation curve of the light emission luminance of OLED and the voltage difference at its yin-yang the two poles of the earth
Two kinds of different modes are spent, the constant interval of the voltage difference between OLED yin-yang the two poles of the earth is different.Such as under high brightness mode,
The voltage difference at OLED yin-yang the two poles of the earth changes within the scope of A-B, and under high contrast mode, the voltage difference at OLED yin-yang the two poles of the earth is in C-D
Variation in range.If to meet two kinds of display effects of high brightness and high comparison simultaneously, in the case where supply voltage is fixed,
The amplitude of variation of voltage difference between OLED yin-yang the two poles of the earth is very big, and drive transistor source leaks the variation width of the voltage difference between the two poles of the earth
Degree will also become much larger, and there is the breakdown risk of driving transistor.Therefore, it is readily appreciated that in conventional design, under both of which
Supply voltage be it is different, this causes organic light-emitting diode pixel circuit to can be only in one mode.
Summary of the invention
The present invention at least partly solves to cannot be considered in terms of high brightness when driving existing organic light-emitting diode pixel circuit
The problem of with height comparison, provide a kind of pixel circuit and its driving method, display base plate.
According to the first aspect of the invention, a kind of pixel circuit, including the first driving transistor, the second driving crystal are provided
Pipe, Organic Light Emitting Diode；
The grid of the first driving transistor connects the first data terminal, the first pole connects the first power end, and the second pole connects
Connect the first pole of the Organic Light Emitting Diode；
The grid of the second driving transistor connects the second data terminal, and the first pole connects second source end, and the second pole connects
Connect the second pole of the Organic Light Emitting Diode.
Optionally, the pixel circuit further includes the first reset unit and the second reset unit；
First reset unit connects the first pole and the first reset signal end of the Organic Light Emitting Diode, is used for
The voltage of the first pole of the Organic Light Emitting Diode is resetted under the control at the first reset signal end；
Second reset unit connects the second pole and the second reset signal end of the Organic Light Emitting Diode, is used for
The voltage of the second pole of the Organic Light Emitting Diode is resetted under the control at the second reset signal end.
Optionally, first reset unit includes the first reset transistor, and second reset unit includes second multiple
Bit transistor；
The grid of first reset transistor connects the first reset signal end, and the first pole connects initial voltage and provides end,
Second pole connects the first pole of the Organic Light Emitting Diode；
The grid of second reset transistor connects the second reset signal end, and the first pole connects initial voltage and provides end,
Second pole connects the second pole of the Organic Light Emitting Diode.
Optionally, the pixel circuit further includes first switch unit, the first storage unit, second switch unit and second
Storage unit；
First pole of first storage unit connects level pressure source, the second pole connects the described first grid for driving transistor；
First pole of second storage unit connects level pressure source, the second pole connects the described second grid for driving transistor；
The first switch unit connects first grid control signal end, for the signal control according to first grid control signal end
The grid for making the first driving transistor is connect with the first data terminal；
The second switch unit connects second gate control signal end, for the signal control according to second gate control signal end
The grid for making the second driving transistor is connect with the second data terminal.
Optionally, the first switch unit includes first switch transistor, and grid connects first grid control signal end,
First pole connects first data terminal, and the second pole connects the grid of the first driving transistor；
The second switch unit includes second switch transistor, and grid connects second gate control signal end, the first pole
Second data terminal is connected, the second pole connects the grid of the second driving transistor.
Optionally, the pixel circuit further includes the first luminous controling unit and the second luminous controling unit；
First luminous controling unit connects the first LED control signal end, for being believed according to first light emitting control
Number end signal control the first power end and it is described first driving transistor the first pole conducting；
Second luminous controling unit connects the second LED control signal end, for being believed according to second light emitting control
Number end signal control second source end and it is described second driving transistor the first pole conducting.
Optionally, first luminous controling unit includes the first light emitting control transistor, and grid connection first shines
Control signal end, the first pole connect first power supply, and the second pole connects the first pole of the first driving transistor；
Second luminous controling unit includes the second light emitting control transistor, and grid connects the second LED control signal
End, the first pole connect the second source, and the second pole connects the first pole of the second driving transistor.
According to the second aspect of the invention, a kind of driving method of pixel circuit is provided, first aspect present invention is applied to
Provided pixel circuit, the driving method include:
First voltage is provided to first power end, provides second voltage to the second source end；
In light emitting phase, the first data voltage is provided to the grid of the first driving transistor, to second driving
The grid of transistor provides the second data voltage.
Optionally, which further includes reseting stage and charging stage before light emitting phase,
In reseting stage, effective voltage is provided with by institute to first reset signal end and second reset signal end
The voltage of the first pole and the second pole of stating Organic Light Emitting Diode is reset to initial voltage, to the first gate control signal
End, the second gate control signal end, first LED control signal end, second LED control signal end provide in vain
Voltage；
In the charging stage, to the first grid control signal end and the second gate control signal end provide effective voltage with
The grid that the grid of the first driving transistor is connect with first data terminal and drives transistor for described second
It is connect with second data terminal, provides the first data voltage to first data terminal, provide the to second data terminal
Two data voltages, to first reset signal end, second reset signal end, first LED control signal end, institute
It states the second LED control signal end and dead voltage is provided；
Grid first data voltage of offer in light emitting phase, driving transistor to described first, to described second
It includes: to provide in light emitting phase to first LED control signal end that the grid of driving transistor, which provides the second data voltage,
Effective voltage is connected with the first pole for controlling the first power end and the first driving transistor, is believed to second light emitting control
Number end provides effective voltage to control the first pole conducting at second source end and the second driving transistor, multiple to described first
Position signal end, second reset signal end, the first grid control signal end and the second gate control signal end provide nothing
Imitate voltage.
According to the third aspect of the invention we, a kind of display base plate, including multiple pixel circuits are provided, the pixel circuit is
Provided pixel circuit according to a first aspect of the present invention.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of pixel circuit of the embodiment of the present invention；
Fig. 2 is the driver' s timing figure of circuit diagram shown in corresponding diagram 1；
Wherein, appended drawing reference are as follows: M4, the first driving transistor；M7, the second driving transistor；D1, organic light-emitting diodes
Pipe；VdataA, the first data terminal；VdataB, the second data terminal；R1, the first reset unit；R2, the second reset unit；Rst1,
First reset signal end；Rst2, the second reset signal end；M3, the first reset transistor；M8, the second reset transistor；Gate1,
First grid control signal end；Gate1B, the first reverse phase gate control signal end；Gate2, second gate control signal end；Gate2B,
Two reverse phase gate control signal ends；Sw1, first switch unit；Sw2, second switch unit；St1, the first storage unit；St2,
Two storage units；Vcom1, the first common voltage terminal；Vcom2, the second common voltage terminal；M1, first switch transistor；M2,
Two switching transistors；M9, third switching transistor；M10, the 4th switching transistor；L1, the first luminous controling unit；L2, second
Luminous controling unit；EM1, the first LED control signal end；EM2, the second LED control signal end；M5, the first light emitting control are brilliant
Body pipe；M6, the second light emitting control transistor；C1, the first storage capacitance；C2, the second storage capacitance；P1, reseting stage；P2, it fills
The electric stage；P3, light emitting phase.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Present invention is further described in detail for formula.
It is readily appreciated that, for NMOS tube, the effective voltage of gate voltage is high voltage, for PMOS tube, gate voltage
Effective voltage is low-voltage.
Embodiment 1:
The present embodiment provides a kind of pixel circuits, as shown in Figure 1, including the first driving transistor M4, the second driving crystal
Pipe M7, Organic Light Emitting Diode D1；The grid of first driving transistor M4 connects the first data terminal VdataA, the first pole connection the
One power end VDD1, the second pole connect the first pole of Organic Light Emitting Diode D1；The grid connection the of second driving transistor M7
Two data terminal VdataB, the first pole connect second source end VDD2, and the second pole connects the second pole of Organic Light Emitting Diode D1.
That is to say the first data terminal VdataA voltage signal control first driving the first pole transistor M4 and the second pole (
That is grid source the two poles of the earth) between conduction, the second data terminal VdataB voltage signal control second driving the first pole transistor M7
With the conduction between the second pole (namely grid source the two poles of the earth), transistor M4, You Jifa are driven from the first power end VDD1 through first
Optical diode D1, the second driving transistor M7, second source end VDD2 form an access.
The variation range of the permission of source and drain the two poles of the earth voltage difference of first driving transistor M4 is with the second driving transistor M7's
The superimposed maximum variation model for just obtaining two pole tension of Organic Light Emitting Diode D1 of the permission variation range of source and drain the two poles of the earth voltage difference
It encloses.In the case that voltage difference between the first power end VDD1 and second source end VDD2 is sufficiently large, Organic Light Emitting Diode
The adjustable range of voltage difference between D1 yin-yang the two poles of the earth is improved.In this way, being conducive to realize that high brightness and height are right simultaneously
Than two kinds of display patterns of degree.
In the embodiment shown in fig. 1, extremely its anode of the first of Organic Light Emitting Diode D1, Organic Light Emitting Diode D1
Second extremely its cathode.
Optionally, pixel circuit further includes the first reset unit R1 and the second reset unit R2；First reset unit R1 connects
The first pole and the first reset signal end Rst1 for meeting Organic Light Emitting Diode D1, for the control in the first reset signal end Rst1
Under the voltage of the first pole of Organic Light Emitting Diode D1 is resetted；Second reset unit R2 connection Organic Light Emitting Diode D1
The second pole and the second reset signal end Rst2, under the control of the second reset signal end Rst2 to Organic Light Emitting Diode
The voltage of the second pole of D1 is resetted.
It that is to say through the first reset unit R1 according to the signal of the first reset signal end Rst1 to Organic Light Emitting Diode
The voltage of the first pole of D1 is reset, by the second reset unit R2 according to the signal of the second reset signal end Rst2 to organic
The voltage of the second pole of light emitting diode D1 is reset.
It should be noted that the timing or both of the first reset signal end Rst1 and the second reset signal end Rst2 say the two
The period to play a role is usually identical, therefore the port that the two is also possible to be connected is (in the identical feelings of the two effective voltage
Under condition), to receive identical drive voltage signal from extraneous driving circuit.
Specifically, as shown in Figure 1, the first reset unit R1 includes the first reset transistor M3, the second reset unit R2 packet
Include the second reset transistor M8；The grid of first reset transistor M3 connects the first reset signal end Rst1, and the connection of the first pole is just
Beginning voltage provides end, and the second pole connects the first pole of Organic Light Emitting Diode D1；The grid connection the of second reset transistor M8
Two reset signal end Rst2, the first pole connect initial voltage and provide end, and the second pole connects the second pole of Organic Light Emitting Diode D1.
First reset signal end Rst1 controls the first reset transistor M3 conducting, to provide initial voltage to the voltage at end
The first pole of Organic Light Emitting Diode D1 is written, the second reset signal end Rst2 controls the second reset transistor M8 conducting, thus
Initial voltage is provided to the second pole of the voltage write-in Organic Light Emitting Diode D1 at end.
In the embodiment shown in figure 1, it is the first common voltage terminal Vcom1 that initial voltage, which provides end,.
Optionally, pixel circuit further includes first switch cell S w1, the first storage unit St1, second switch cell S w2
With the second storage unit St2；The first pole of first storage unit St1 connects level pressure source, the second pole connects the first driving transistor M4's
Grid；The first pole of second storage unit St2 connects level pressure source, the second pole connects the grid of the second driving transistor M7；First switch
Cell S w1 connection first grid control signal end Gate1, for according to the signal of first grid control signal end Gate1 control first
The grid of driving transistor M4 is connect with the first data terminal VdataA；Second switch cell S w2 connection second gate control signal end
Gate2, for the grid and the second data according to the second driving of the signal of second gate control signal end Gate2 control transistor M7
Hold VdataB connection.
It that is to say the voltage of the grid by the first driving of the first storage unit St1 storage transistor M4, it is single by the second storage
The voltage of the grid of first the second driving of St2 storage transistor M7.First driving transistor M4 grid whether with the first data terminal
VdataA connection is to receive control of the data voltage by first switch cell S w1, the grid of the second driving transistor M7
Whether it connect to receive control of the data voltage by second switch cell S w2 with the second data terminal VdataB.
Specifically, as shown in Figure 1, the first storage unit St1 is the first storage capacitance C1, the level pressure source that wherein one end connects
It is the second storage capacitance C2 for the first common voltage terminal Vcom1 (e.g. 0V), the second storage unit St2, wherein one end connects
Level pressure source be the second common voltage terminal Vcom2 (e.g. -5V).Certainly, the level pressure source that two storage capacitances are connected can also
To be identical voltage.
Specifically, as shown in Figure 1, first switch cell S w1 includes first switch transistor M1, grid connects the first grid
Control signal end Gate1, the first pole connect the first data terminal VdataA, the grid of the first driving of the second pole connection transistor M4；
Second switch cell S w2 includes second switch transistor M2, and grid connects second gate control signal end Gate2, and the first pole connects
Connect the second data terminal VdataB, the grid of the second driving of the second pole connection transistor M7.
That is whether first grid control signal end Gate1 control first switch transistor M1 is connected, to determine the first data
The gate turn-on for holding VdataA whether to drive transistor M4 with first, it is brilliant that second gate control signal end Gate2 controls second switch
Whether body pipe M2 is connected, to determine the gate turn-on whether the second data terminal VdataB drives transistor M7 with second.
In the embodiment shown in figure 1, first switch transistor M1, first switch transistor M1 are NMOS tube, are
Guarantee that voltage is not detracted after first switch cell S w1 and second switch cell S w2, corresponding first switch transistor M1 is also
The 4th switch is also provided with provided with third switching transistor M9 (a specially PMOS tube), corresponding second switch transistor M2
Transistor M10 (a specially PMOS tube).The two poles of the earth of third switching transistor M9 are separately connected first switch transistor M1's
The two poles of the earth, grid connect the first reverse phase gate control signal end Gate1B.The two poles of the earth of 4th switching transistor M10 are separately connected second
The two poles of the earth of switching transistor M2, grid connect the second reverse phase gate control signal end Gate2B.
In corresponding driving circuit, the signal that is exported to the first reverse phase gate control signal end Gate1B should with to the first grid-control
The signal phase of signal end Gate1 output processed is on the contrary, the signal Ying Yuxiang exported to the second reverse phase gate control signal end Gate2B
The signal phase of second gate control signal end Gate2 output is opposite.
Optionally, pixel circuit further includes the first luminous controling unit L1 and the second luminous controling unit L2；First shines
Control unit L1 connection the first LED control signal end EM1, for according to the signal of the first LED control signal end EM1 control the
The conducting of first pole of one power end and the first driving transistor M4；Second luminous controling unit L2 the second light emitting control of connection letter
Number end EM2, for controlling second source end and the second driving transistor M7 according to the signal of the second LED control signal end EM2
The conducting of first pole.
It that is to say that the first luminous controling unit L1 controls the first power end according to the signal of the first LED control signal end EM1
Whether be connected with the first pole of the first driving transistor M4, the second luminous controling unit L2 is according to the second LED control signal end
Whether the signal control second source end of EM2 and the first pole of the second driving transistor M7 are connected.
Specifically, as shown in Figure 1, the first luminous controling unit L1 includes the first light emitting control transistor M5, grid connects
The first LED control signal end EM1 is met, the first pole connects the first power supply, and the second pole connection first drives the first of transistor M4
Pole；Second luminous controling unit L2 includes the second light emitting control transistor M6, and grid connects the second LED control signal end
EM2, the first pole connect second source, the first pole of the second driving of the second pole connection transistor M7.
That is to say whether the first light emitting control transistor M5 and the second light emitting control transistor M6 simultaneously turn on, determine from
First power end is brilliant through the first light emitting control transistor M5, the first driving transistor M4, Organic Light Emitting Diode D1, the second driving
Body pipe M7, the second light emitting control transistor M6 to second source route whether be connected.
If the first light emitting control transistor M5 and the second light emitting control transistor M6 are NMOS tube or PMOS tube (Fig. 1
In for being PMOS tube), then corresponding driving circuit should be to the first LED control signal end EM1 and the second light emitting control
Signal end EM2 exports the signal with phase, what the two can be connected to.The control if the first light emitting control transistor M5 and second shines
Transistor M6 processed is different types of transistor (such as a NMOS tube, a PMOS tube), then corresponding driving circuit is answered
To the signal of the first LED control signal end EM1 and the second LED control signal end EM2 output reverse phase.
It should be appreciated that Fig. 1 is only a specific circuit diagram for realizing inventive concept of the invention.Those skilled in the art
Unit can also be deformed or increased and decreased to every kind of unit, such as in the driving transistor of first switch cell S w1 and first
Threshold voltage compensation unit is inserted between M4, the voltage of the first data terminal VdataA is compensated etc..
Embodiment 2:
The present embodiment provides a kind of driving methods of pixel circuit, are applied to the electricity of pixel provided by the embodiment of the present invention 1
Road, the driving method include: to provide first voltage to the first power end, provide second voltage to second source end；In luminous rank
Section P3, provides the first data voltage to the grid of the first driving transistor M4, provides the to the grid of the second driving transistor M7
Two data voltages.
According to Such analysis it is known that as long as the difference of first voltage and second voltage is sufficiently large, due to two driving transistors
The voltage at yin-yang the two poles of the earth of (the first driving transistor M4 and the second driving transistor M7) co- controlling Organic Light Emitting Diode D1,
So Organic Light Emitting Diode D1 voltage difference of the two ends amplitude of variation can be improved, i.e. realization high brightness high contrast shows mould
Formula.
For the organic light-emitting diode display substrate without scanning, the first data terminal of real-time update VdataA is only needed
Data voltage and the second data terminal VdataB data voltage can be realized display picture update, any time is all luminous
Stage P3.For needing to scan the Organic Light Emitting Diode D1 display base plate of (such as progressive scan), then need one
The period of display is divided into light emitting phase P3 and non-luminescent stage (such as aftermentioned reseting stage P1 and charging stage P2)
It referring to Fig.1, with the voltage of the first power end VDD1 is 6V in introduced below, the voltage of second source end VDD2 is-
1V, it is 0V that the first common voltage, which provides the common voltage that end Vcom1 is provided, and the second common voltage provides the end Vcom2 public affairs provided
Common voltage is illustrated for being -5V.Voltage after the label of timing middle port shown in Fig. 2 is the low-voltage and height electricity of corresponding ports
The specific value of pressure, Fig. 2 are the timing diagram of circuit shown in corresponding diagram 1.
Optionally, which further includes reseting stage P1 and charging stage P2 before light emitting phase P3.
In reseting stage P1, effective voltage is provided to incite somebody to action to the first reset signal end Rst1 and the second reset signal end Rst2
The first pole of Organic Light Emitting Diode D1 and the voltage of the second pole are reset to initial voltage, to first grid control signal end
Gate1, second gate control signal end Gate2, the first LED control signal end EM1, the second LED control signal end EM2 provide nothing
Imitate voltage.
At this stage, only the first reset transistor M3, the second reset transistor M8 are connected, to Organic Light Emitting Diode D1 two
The voltage of pole is reset.
In charging stage P2, effectively electricity is provided to first grid control signal end Gate1 and second gate control signal end Gate2
Grid of the pressure the grid of the first driving transistor M4 to connect with the first data terminal VdataA and drive transistor M7 for second
Pole is connect with the second data terminal VdataB, the first data voltage is provided to the first data terminal VdataA, to the second data terminal
VdataB provides the second data voltage, to the first reset signal end Rst1, the second reset signal end Rst2, the first light emitting control letter
Number end EM1, the second LED control signal end EM2 provide dead voltage.
At this stage, only first switch transistor M1, second switch transistor M2 are connected, thus to the first storage capacitance C1
Data voltage is written with the non-constant pressure end of the second storage capacitance C2.
Scheme as a further preference, as shown in Figure 1, being additionally provided with third switching transistor M9 in the pixel circuit
(its first pole and the second pole are separately connected the first pole and the second pole of first switch transistor M1, and grid connects the first reverse phase grid-control
Signal end Gate1B processed) and the 4th switching transistor M10 (its first pole and the second pole are separately connected second switch transistor M2's
First pole and the second pole, grid meet the second reverse phase gate control signal end Gate2B).It is appreciated that the first reverse phase gate control signal
The signal for holding Gate1B is opposite, the second reverse phase gate control signal end with the phase of first grid control signal end Gate1
The signal of Gate2B is opposite with the phase of second gate control signal end Gate2.
Namely at this stage, only first switch transistor M1, second switch transistor M2, third switching transistor M9,
Four switching transistor M10 conducting.
In light emitting phase P3, effective voltage is provided to control the first power end VDD1 to the first LED control signal end EM1
With the first pole conducting of the first driving transistor M4, effective voltage is provided to control second to the second LED control signal end EM2
The first pole conducting of the driving of power end VDD2 and second transistor M7, to the first reset signal end Rst1, the second reset signal end
Rst2, first grid control signal end Gate1 and second gate control signal end Gate2 provide dead voltage.
At this stage, only the first light emitting control transistor M5, the first driving transistor M4, Organic Light Emitting Diode D1, the
Two driving transistor M7, the second light emitting control transistor M6 are conductings, and Organic Light Emitting Diode D1 shines.
Theoretically, as long as the voltage of the voltage of the first power end VDD1, second source end VDD2 determines each transistor and have
The parameter of machine light emitting diode D1 determines, then when the voltage for being supplied to the first data terminal VdataA, the second data terminal VdataB
After determination, the voltage difference at the both ends Organic Light Emitting Diode D1 is also determined that, the brightness of the light issued also determines that.Engineering
On generally by experiment method, adjust the first data terminal VdataA and the second data terminal VdataB voltage, measure the picture
The brightness of the sub-pixel (or display base plate, display panel etc. of sub-pixel composition) of plain railway superstructures, when the brightness meets
In gamma curve when the brightness requirement of certain grayscale, then by this time the first data voltage and the second data voltage be recorded as it is corresponding should
The combination of the driving voltage of grayscale so repeats, the first data voltage and the second data electricity until finding corresponding all grayscale
The combination of pressure.
Embodiment 3:
The present embodiment provides a kind of display base plates, including multiple pixel circuits, and the pixel circuit is according to 1 institute of embodiment
The pixel circuit of offer.
Also pixel circuit provided by embodiment 1 is arranged and provides phase in the display base plate, and for each data terminal
The data line answered, to receive external driving voltage.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of pixel circuit, which is characterized in that including the first driving transistor, the second driving transistor, organic light-emitting diodes
Pipe；
The grid of the first driving transistor connects the first data terminal, the first pole connects the first power end, and the second pole connects institute
State the first pole of Organic Light Emitting Diode；
The grid of the second driving transistor connects the second data terminal, and the first pole connects second source end, and the second pole connects institute
State the second pole of Organic Light Emitting Diode.
2. pixel circuit according to claim 1, which is characterized in that the pixel circuit further include the first reset unit and
Second reset unit；
First reset unit connects the first pole and the first reset signal end of the Organic Light Emitting Diode, for first
The voltage of the first pole of the Organic Light Emitting Diode is resetted under the control at reset signal end；
Second reset unit connects the second pole and the second reset signal end of the Organic Light Emitting Diode, for second
The voltage of the second pole of the Organic Light Emitting Diode is resetted under the control at reset signal end.
3. pixel circuit according to claim 2, which is characterized in that first reset unit includes the first reset crystal
Pipe, second reset unit include the second reset transistor；
The first reset signal end of grid connection of first reset transistor, the first pole connection initial voltage offer end, second
Pole connects the first pole of the Organic Light Emitting Diode；
The second reset signal end of grid connection of second reset transistor, the first pole connection initial voltage offer end, second
Pole connects the second pole of the Organic Light Emitting Diode.
4. pixel circuit according to claim 3, which is characterized in that
The pixel circuit further includes first switch unit, the first storage unit, second switch unit and the second storage unit；
First pole of first storage unit connects level pressure source, the second pole connects the described first grid for driving transistor；
First pole of second storage unit connects level pressure source, the second pole connects the described second grid for driving transistor；
The first switch unit connects first grid control signal end, for controlling institute according to the signal of first grid control signal end
The grid for stating the first driving transistor is connect with the first data terminal；
The second switch unit connects second gate control signal end, for controlling institute according to the signal of second gate control signal end
The grid for stating the second driving transistor is connect with the second data terminal.
5. pixel circuit according to claim 4, which is characterized in that the first switch unit includes first switch crystal
Pipe, grid connect first grid control signal end, and the first pole connects first data terminal, the second pole connection first driving
The grid of transistor；
The second switch unit includes second switch transistor, and grid connects second gate control signal end, the connection of the first pole
Second data terminal, the second pole connect the grid of the second driving transistor.
6. pixel circuit according to claim 5, which is characterized in that
The pixel circuit further includes the first luminous controling unit and the second luminous controling unit；
First luminous controling unit connects the first LED control signal end, for according to first LED control signal end
Signal control the first power end and it is described first driving transistor the first pole conducting；
Second luminous controling unit connects the second LED control signal end, for according to second LED control signal end
Signal control second source end and it is described second driving transistor the first pole conducting.
7. pixel circuit according to claim 6, which is characterized in that
First luminous controling unit includes the first light emitting control transistor, and grid connects the first LED control signal end,
First pole connects first power supply, and the second pole connects the first pole of the first driving transistor；
Second luminous controling unit includes the second light emitting control transistor, and grid connects the second LED control signal end,
First pole connects the second source, and the second pole connects the first pole of the second driving transistor.
8. a kind of driving method of pixel circuit, which is characterized in that applied to picture described in -7 any one according to claim 1
Plain circuit, the driving method include:
First voltage is provided to first power end, provides second voltage to the second source end；
In light emitting phase, the first data voltage is provided to the grid of the first driving transistor, to the second driving crystal
The grid of pipe provides the second data voltage.
9. driving method according to claim 8, which is characterized in that the pixel circuit is according to claim 7
Pixel circuit, which further includes reseting stage and charging stage before light emitting phase,
In reseting stage, effective voltage is provided to have described to first reset signal end and second reset signal end
First pole of machine light emitting diode and the voltage of the second pole are reset to initial voltage, to the first grid control signal end, institute
Second gate control signal end, first LED control signal end, second LED control signal end offer dead voltage are provided；
In the charging stage, effective voltage is provided with by institute to the first grid control signal end and the second gate control signal end
The grid for stating the first driving transistor connect with first data terminal and by it is described second driving transistor grid and institute
The connection of the second data terminal is stated, provides the first data voltage to first data terminal, provides the second number to second data terminal
According to voltage, to first reset signal end, second reset signal end, first LED control signal end, described
Two LED control signal ends provide dead voltage；
It is described to provide the first data voltage to the grid of the first driving transistor in light emitting phase, to second driving
It includes: to provide to first LED control signal end effective in light emitting phase that the grid of transistor, which provides the second data voltage,
Voltage is connected with the first pole for controlling the first power end and the first driving transistor, to second LED control signal end
Effective voltage is provided to control the first pole conducting at second source end and the second driving transistor, resets letter to described first
Number end, second reset signal end, the first grid control signal end and the second gate control signal end provide invalid electricity
Pressure.
10. a kind of display base plate, including multiple pixel circuits, which is characterized in that the pixel circuit is according to claim 1-7
Pixel circuit described in any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810949164.7A CN109003575B (en) | 2018-08-20 | 2018-08-20 | Pixel circuit, driving method thereof and display substrate |
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| CN201810949164.7A CN109003575B (en) | 2018-08-20 | 2018-08-20 | Pixel circuit, driving method thereof and display substrate |
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| CN109003575B CN109003575B (en) | 2020-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019205728A1 (en) * | 2018-04-27 | 2019-10-31 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
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| CN109003575B (en) | 2020-04-24 |
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