CN102930819B - Display and driving method thereof - Google Patents
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- CN102930819B CN102930819B CN201110229785.6A CN201110229785A CN102930819B CN 102930819 B CN102930819 B CN 102930819B CN 201110229785 A CN201110229785 A CN 201110229785A CN 102930819 B CN102930819 B CN 102930819B
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Abstract
A display comprises a plurality of organic light emitting diode pixels. Each organic light emitting diode pixel comprises an organic light emitting diode, a driving transistor, a switch transistor, a first compensating block and a second compensating block, wherein each driving transistor is provided with a first end coupled to an anode end of the corresponding organic light emitting diode, a second end for receiving a work voltage and a control end for receiving a data voltage; each switch transistor is provided with a first end coupled to a control end of the corresponding driving transistor, a second end for receiving a data voltage and a control end for receiving a first control signal; each first compensating block is coupled to the first end and the control end of the corresponding driving transistor; and each second compensating block is coupled to the first end of the corresponding driving transistor and receives the corresponding first control signal and the corresponding data voltage.
Description
[technical field]
The invention relates to a kind of display and driving method thereof.
[background technology]
Please refer to Fig. 1, it illustrates the circuit diagram of traditional active-matrix Organic Light Emitting Diode (active matrixorganic light emitting diode, AMOLED) picture element.Driving transistors MOS_dri in AMOLED picture element 10 is that N-type drives pattern, and it mostly applies amorphous silicon (a-Si) and indium gallium zinc oxide (IGZO) backplane technology.Although the critical voltage of amorphous silicon and indium gallium zinc oxide transistor component has initial high uniform characteristic, but it still can produce deterioration (degradation) and cannot maintain the output electric current same with prima facies after assembly operation a period of time, causes display brightness uneven (mura) or other problem.
In addition, the negative electrode of the OLED 12 in AMOLED picture element 10 is possess the transparency but the higher indium tin oxide (ITO) of work function, therefore in device process, need separate procedure process to reduce the work function of ITO to obtain the OLED assembly of tool reliability and better characteristic, improve the complexity of overall manufacturing process.
[summary of the invention]
This exposure relates to a kind of display and driving method thereof, make each Organic Light Emitting Diode of display (organic light emitting diode, OLED) picture element export identical current value when identical data inputs by critical voltage compensation mechanism and can not increase along with the time and decay.
According to the first aspect of this exposure, propose a kind of display, comprise a panel.Panel comprises multiple Organic Light Emitting Diode picture element, and each Organic Light Emitting Diode picture element comprises an Organic Light Emitting Diode, a driving transistors, a switching transistor, one first compensation block and one second compensation block.Driving transistors has a first end to be coupled to an anode tap of Organic Light Emitting Diode, one second end to receive an operating voltage and a control end to receive a data voltage.Switching transistor has a first end to be coupled to the control end of driving transistors, one second end to receive data voltage and a control end to receive one first control signal.First compensates first end and the control end that block is coupled to driving transistors.Second compensates the first end that block is coupled to driving transistors, and receives the first control signal and data voltage.
According to the second aspect of this exposure, propose a kind of driving method of display, display comprises a panel.Panel comprises multiple Organic Light Emitting Diode picture element, and each Organic Light Emitting Diode picture element comprises an Organic Light Emitting Diode, a driving transistors, a switching transistor, one first compensation block and one second compensation block.Driving transistors has a first end to be coupled to an anode tap of Organic Light Emitting Diode, one second end to receive an operating voltage and a control end to receive a data voltage.Switching transistor has a first end to be coupled to the control end of driving transistors, one second end to receive data voltage and a control end to receive one first control signal.First compensates first end and the control end that block is coupled to driving transistors.Second compensates the first end that block is coupled to driving transistors, and receives the first control signal and data voltage.The driving method of display comprises the following steps.In a reset phase, reset the first compensation block and make the first compensation block have a reference voltage and data voltage, and the first control signal compensates block cut-off driving transistors by switching transistor and second.In a compensated stage, second compensates block makes driving transistors suspension joint open to discharge cut-off again by ground to the low level voltage of the first end of driving transistors, first compensates block retains the voltage of first end of the driving transistors after ending and a voltage difference of reference voltage and data voltage.In a glow phase, conducting Organic Light Emitting Diode, make the voltage of the first end of driving transistors be a driving voltage, first compensates the control end that the voltage difference of the voltage of the first end of reference voltage in compensated stage and driving transistors and driving voltage are fed back to driving transistors by block.
According to the third aspect of this exposure, propose a kind of display, comprise a panel.Panel comprises multiple Organic Light Emitting Diode picture element, and each Organic Light Emitting Diode picture element comprises an Organic Light Emitting Diode, a driving transistors, a switching transistor, one first compensation block and one second compensation block.Driving transistors has a first end to be coupled to an anode tap of Organic Light Emitting Diode, one second end to receive an operating voltage and a control end to receive a data voltage.Switching transistor has a first end to be coupled to the control end of driving transistors, one second end to receive data voltage and a control end to receive one first control signal.First compensates the second end and the control end that block is coupled to driving transistors.Second compensates the second end that block is coupled to driving transistors, and receives the first control signal and data voltage.
In order to have better understanding to the above-mentioned of this exposure and other side, an embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below:
[accompanying drawing explanation]
Fig. 1 illustrates the circuit diagram of traditional active-matrix Organic Light Emitting Diode picture element.
Fig. 2 illustrates the circuit diagram of the OLED picture element according to one first embodiment.
Fig. 3 illustrates the driver' s timing figure of the OLED picture element according to the first embodiment.
Fig. 4 illustrates the circuit diagram of the OLED picture element according to one second embodiment.
Fig. 5 illustrates the circuit diagram of the OLED picture element according to one the 3rd embodiment.
Fig. 6 illustrates the driver' s timing figure of the OLED picture element according to the 3rd embodiment.
Fig. 7 illustrates the circuit diagram of the OLED picture element according to one the 4th embodiment.
Fig. 8 illustrates the circuit diagram of the OLED picture element according to one the 5th embodiment.
[primary clustering symbol description]
10:AMOLED picture element
12、210、710、810：OLED
200,300,700,800:OLED picture element
220,720,820: the first block is compensated
230,330,730,830: the second block is compensated
[embodiment]
The display that this exposure proposes and driving method thereof, make each Organic Light Emitting Diode of display (organic light emitting diode, OLED) picture element export identical current value when identical data inputs by critical voltage compensation mechanism and can not increase along with the time and decay.
Display comprises a panel, a gate drive unit and one source pole pole driver element.Panel comprises multiple Organic Light Emitting Diode picture element.Gate drive unit is in order to this little Organic Light Emitting Diode picture element of activation.Source electrode pole driver element is in order to drive this little Organic Light Emitting Diode picture element.Next hereby explain for N-type MOS transistor, be so not limited to this, N-type MOS transistor or BJT transistor can also be used, look closely actual design demand and determine.Please refer to Fig. 2, it illustrates the circuit diagram of the OLED picture element according to one first embodiment.OLED picture element 200 comprises OLED 210, driven MOS transistor MOS_dri, a switch mos transistor MOS_sw, one first and compensates block 220 and one second compensation block 230.Driven MOS transistor MOS_dri has a first end (node S) to be coupled to the anode tap of OLED 210, one second end to receive an operating voltage ELVDD and a control end (node G) to receive a data voltage Data.Switch mos transistor MOS_sw has a first end to be coupled to the control end of driven MOS transistor MOS_dri, one second end to receive data voltage Data and a control end to receive one first control signal Sn.
First compensates first end and the control end that block 220 is coupled to driven MOS transistor MOS_dri.Second compensates the first end that block 230 is coupled to driven MOS transistor MOS_dri, and receives the first control signal Sn and data voltage Data.In a reset phase, first compensates block 220 is reset and has reference voltage REF and data voltage Data, and the first control signal Sn ends driven MOS transistor MOS_dri by switch mos transistor MOS_sw and second compensation block 230.
In a compensated stage, second compensates block 230 makes driven MOS transistor MOS_dri suspension joint open (floating on) to discharge cut-off again by ground to the low level voltage of the first end of driven MOS transistor MOS_dri, first compensates block 220 retains the voltage of first end of the driven MOS transistor MOS_dri after ending and a voltage difference of reference voltage REF and data voltage Data.In a glow phase, first compensates block 220 conducting driven MOS transistor MOS_dri with driving OLED 210, and the voltage difference maintaining the voltage of the first end of reference voltage and driven MOS transistor MOS_dri in compensated stage is with the control end of the driven MOS transistor MOS_dri of the voltage back of the first end by the driven MOS transistor MOS_dri after conducting to conducting.
In Fig. 2, second compensates block 230 comprises one first MOS transistor T1, and the first MOS transistor T1 has a first end to be coupled to the first end of driven MOS transistor MOS_dri, one second end to receive data voltage Data and a control end to receive the first control signal Sn.First compensates block 220 comprises one second MOS transistor T2, one second electric capacity C2, one the 3rd electric capacity C3 and the 3rd MOS transistor T3.Second MOS transistor T2 has a first end to receive a reference voltage REF and a control end to receive one first enable signal En.Wherein, the level of reference voltage REF is higher than the level of data voltage Data.
Second electric capacity C2 has a first end (node A) to be coupled to one second end of the second MOS transistor T2 and one second end to be coupled to the first end of driven MOS transistor MOS_dri.3rd electric capacity C3 has a first end to be coupled to second end of the second MOS transistor T2 and one second end to be coupled to the control end of driven MOS transistor MOS_dri.3rd MOS transistor T3 have a first end to be coupled to the first end of the 3rd electric capacity C3, one second end receives one second enable signal XEn or one second control signal Sn ' with the second end and a control end that are coupled to the 3rd electric capacity C3.
Please refer to Fig. 3, it illustrates the driver' s timing figure of the OLED picture element according to the first embodiment.In reset phase t1, the first enable signal En conducting second MOS transistor T2, node A is refitted in reference voltage REF; First control signal Sn actuating switch MOS transistor MOS_sw and the first MOS transistor T1, make data voltage Data be pacified ingress G and node S, driven MOS transistor MOS_dri is cut off.Now, the cathode voltage ELVSS that a cathode terminal of OLED 210 receives is rocked to a noble potential to end OLED 210.In addition, from Fig. 2 and Fig. 3, in reset phase, there is not current path therefore can not cause meaningless power consumption in OLED picture element 200, also can not produce power electric pressure drop (IR drop) when being applied to large scale display device.
In compensated stage t2, the first control signal Sn cutoff switch MOS transistor MOS_sw, the current potential of node G is maintained at data voltage Data, and the current potential of node A is maintained at reference voltage REF.First control signal Sn ends the first MOS transistor T1 and is rocked to the cathode voltage ELVSS cut-off OLED 210 of noble potential, the current potential of node S is coupled to low level voltage V (s) by by the stray capacitance Cgs1 of the first MOS transistor T1, this low level voltage can obtain in formula (1) estimation, and wherein Cp is the shunt capacitance that node S-phase is closed.
V(s)＝Data+(Low-High)×(Cgs1/(Cgs1+C2+Cp))(1)
The lock source electrode pressure reduction of driven MOS transistor MOS_dri and the difference of critical voltage can be estimated by formula (2) and obtain.
Vgs-Vt＝V(g)-V(s)-Vt
＝Data-{Data+(Low-High)×(Cgs1/(Cgs1+C2+Cp))}-Vt
＝(High-Low)×(Cgs1/(Cgs1+C2+Cp))-Vt(2)
Assuming that Low is-10 volts, High is 10 volts, and Cgs1 and C2 is 0.2pr, and ignores shunt capacitance Cp, then formula (2) can be reduced to Vgs-Vt=10-Vt.If critical voltage Vt is less than 10 volts, then low level voltage V (s) makes driven MOS transistor MOS_dri be in suspension joint opening, and starts to be discharged to cut-off state.Now, the current potential of node S is a stopping potential Data-Vt.The voltage difference of node A and node S equal (REF-Data+Vt) can keep by the second electric capacity C2.
Compensated stage t2 can be defined by the second enable signal XEn or the second control signal Sn ' in fact.In this exposure, compensated stage t2 separates with data write cycle (reset phase t1), make the make-up time can be appropriately adjusted and a data write cycle (sweep trace opening time) can not be limited to, add the accuracy of compensation, therefore be more suitable for being applied to large scale and high-resolution display device.
In glow phase t3, first enable signal En ends the second MOS transistor T2, the second enable signal XEn or the second control signal Sn ' conducting the 3rd MOS transistor T3, node A and node G carries out a charge share (charge sharing) and driven MOS transistor MOS_dri is switched on, cathode voltage ELVSS returns back to electronegative potential, and the current potential of node S is fed back to node A to keep the voltage difference (REF-Data+Vt) during compensated stage t2 by the second electric capacity C2.Now, the current potential of node S is Voled, and the current potential of node A is (REF+Voled-Data+Vt), and node G is identical with the current potential of node A.Therefore, the lock source electrode pressure reduction of driven MOS transistor MOS_dri is Vgs=(REF-Data+Vt).The output current I_dri of driven MOS transistor MOS_dri is such as formula shown in (3), and wherein Kp is 1/2 (μ) (Cox) (W/L), and μ is carrier mobility, and Cox is unit area capacitance, and W/L is breadth length ratio.
I_dri＝Kp×(Vgs-Vt)
2＝Kp×(REF-Data)
2(3)
Can find that from formula (3) the output current I_dri of driven MOS transistor MOS_dri and the voltage of critical voltage Vt and OLED 210 have nothing to do.That is the OLED picture element 200 of this exposure can compensate the critical voltage variation of driven MOS transistor MOS_dri, export identical current value when identical data inputs and can not increase along with the time and decay; Meanwhile, the OLED picture element 200 of this exposure can also compensate the voltage variation of OLED 210, and the output current when identical data inputs can not increase with the voltage of OLED210 and change.
Please refer to Fig. 4, it illustrates the circuit diagram of the OLED picture element according to one second embodiment.OLED picture element 300 comprises OLED 210, driven MOS transistor MOS_dri, a switch mos transistor MOS_sw, one first and compensates block 220 and one second compensation block 330.The circuit structure of OLED picture element 300 and operation principles are similar to OLED picture element 200, and both do not exist together and are only that the second compensation block 330 of OLED picture element 300 more comprises one first electric capacity C1.First electric capacity C1 has a first end and is coupled to the control end that the first end of driven MOS transistor MOS_dri and one second end are coupled to the first MOS transistor T1.Wherein, in compensated stage, first control signal Sn cutoff switch MOS transistor MOS_sw and the first MOS transistor T1, the first electric capacity C1 replace stray capacitance Cgs1 in Fig. 2 by the ground of the first end of driven MOS transistor MOS_dri to low level voltage V (s).C1 replaces the Cgs1 in formula (1) and formula (2), and also supposes that C1 is 0.2pf.The driver' s timing of OLED picture element 300 as shown in Figure 3, no longer repeats in this.
Please refer to Fig. 5 and Fig. 6, Fig. 5 illustrates the circuit diagram of the OLED picture element according to one the 3rd embodiment, and Fig. 6 illustrates the driver' s timing figure of the OLED picture element according to the 3rd embodiment.OLED picture element 500 comprises OLED 210, driven MOS transistor MOS_dri, a switch mos transistor MOS_sw, one first and compensates block 220,1 second compensation block 330 and one the 4th MOS transistor T4.The circuit structure of OLED picture element 500 is similar to OLED picture element 300, both differences are in and more comprise the 4th MOS transistor T4 in OLED picture element 500, and the 4th MOS transistor T4 has a first end to be coupled to the anode tap of OLED 210, one second end to be coupled to the first end of driven MOS transistor MOS_dri and a control end to receive the second enable signal XEn.As shown in Figure 6, the 4th MOS transistor T4 with being in, in reset phase t1 and compensated stage t2, OLED 210 and node S isolates, and are electrically connected OLED 210 and node S in glow phase t3.Thus, cathode voltage ELVSS does not need swing and can be maintained at an electronegative potential.In addition, be only controlled by the second enable signal XEn will contribute to the aperture opening ratio of picture element entirety if limit the 3rd MOS transistor in OLED picture element 500.
In addition, as previously mentioned, this exposure can also adopt N-type MOS transistor.Please refer to Fig. 7, illustrate the circuit diagram of the OLED picture element according to one the 4th embodiment.OLED picture element 700 comprises OLED 710, driven MOS transistor MOS_dri, a switch mos transistor MOS_sw, one first and compensates block 720,1 second compensation block 730 and one the 4th MOS transistor T4.The circuit structure of OLED picture element 700 is similar to OLED picture element 500, and its driver' s timing is same as Fig. 6.
In addition, please refer to Fig. 8, it illustrates the circuit diagram of the OLED picture element according to one the 5th embodiment.OLED picture element 800 comprises OLED 810, driven MOS transistor MOS_dri, a switch mos transistor MOS_sw, one first and compensates block 820,1 second compensation block 830 and one the 4th MOS transistor T4.The circuit structure of OLED picture element 800 is similar to OLED picture element 500, and its driver' s timing is same as Fig. 6, and different places is only the level of the level of reference voltage REF lower than data voltage Data.
In addition, this exposure more proposes a kind of driving method of OLED picture element, and OLED picture element comprises an OLED, a driving transistors, a switching transistor, one first compensation block and one second compensation block.Driving transistors has a first end to be coupled to the anode tap of OLED, one second end to receive an operating voltage and a control end to receive a data voltage.Switching transistor has a first end to be coupled to the control end of driving transistors, one second end to receive data voltage and a control end to receive one first control signal.First compensates first end and the control end that block is coupled to driving transistors.Second compensates the first end that block is coupled to driving transistors, and receives the first control signal and data voltage.
The driving method of OLED picture element comprises the following steps.In a reset phase, reset the first compensation block and make the first compensation block have a reference voltage and data voltage, and the first control signal compensates block cut-off driving transistors by switching transistor and second.In a compensated stage, second compensates block makes driving transistors suspension joint open to discharge cut-off again by ground to the low level voltage of the first end of driving transistors, first compensates block retains the voltage of first end of the driving transistors after ending and a voltage difference of reference voltage and data voltage.In a glow phase, conducting OLED, make the voltage of the first end of driving transistors be a driving voltage, first compensates the control end that the voltage difference of the voltage of the first end of reference voltage in compensated stage and driving transistors and driving voltage are fed back to driving transistors by block.
The principle of operation of the driving method of above-mentioned OLED picture element has been specified in Fig. 2 ~ Fig. 6 and related content thereof, therefore no longer repeats in this.
Display disclosed by this exposure above-described embodiment and driving method thereof, Organic Light Emitting Diode (the organic light emitting diode of display, OLED) picture element has the ability of self-sensing critical voltage by critical voltage compensation mechanism, and is fed back to the driving voltage of driving transistors and makes each OLED picture element export identical current value when identical data inputs and can not increase along with the time and decay; Simultaneously, also be there is by OLED voltage compensation mechanism the ability of self-sensing OLED voltage, and be fed back to the driving voltage of driving transistors and make the output current of each OLED picture element when identical data inputs to increase with OLED voltage and to change.
In addition, for each OLED picture element, there is not current path therefore can not cause meaningless power consumption, also can not produce power electric pressure drop when being applied to large scale display device in the display of this exposure and driving method thereof in reset phase.Further, in this exposure, compensated stage separates with data write cycle, makes the make-up time can be appropriately adjusted and can not be limited to the single scanning line opening time, therefore accurate compensation effect can be reached, be more suitable for being applied to large scale and high-resolution display device.
In sum, although the present invention discloses as above with multiple embodiment, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (18)
1. a display, comprising:
One panel, comprises a plurality of Organic Light Emitting Diode picture element, and each Organic Light Emitting Diode picture element comprises:
One Organic Light Emitting Diode;
One driving transistors, has a first end to be coupled to an anode tap of this Organic Light Emitting Diode, one second end to receive an operating voltage and a control end to receive a data voltage;
One switching transistor, has a first end to be coupled to this control end of this driving transistors, one second end to receive this data voltage and a control end to receive one first control signal;
One first compensates block, is coupled to this first end and this control end of this driving transistors; And
One second compensates block, is coupled to this first end of this driving transistors, and receives this first control signal and this data voltage, wherein:
In a reset phase, this first compensation block is reset and has a reference voltage and data voltage, and this first control signal ends this driving transistors by this switching transistor and this second compensation block;
In a compensated stage, this second compensates block and is made by ground to the low level voltage of this first end of this driving transistors this driving transistors suspension joint open to discharge cut-off again, and this first compensates block and retain the voltage of this first end of this driving transistors after ending and a voltage difference of this reference voltage and this data voltage;
In a glow phase, this Organic Light Emitting Diode is switched on, make the voltage of this first end of this driving transistors be a driving voltage, this voltage difference of the voltage of this first end of this reference voltage and this driving transistors in this compensated stage and this driving voltage are fed back to this control end of this driving transistors by this first compensation block.
2. display according to claim 1, is characterized in that, this second compensation block comprises:
One the first transistor, has a first end to be coupled to this first end of this driving transistors, one second end to receive this data voltage and a control end to receive this first control signal;
Wherein, in this reset phase, this this switching transistor of the first control signal conducting and this first transistor make this driving transistors be cut off;
In this compensated stage, this first control signal ends this switching transistor and this first transistor, and the current potential of this first end of this driving transistors is coupled to this low level voltage by the stray capacitance of this first transistor.
3. display according to claim 2, is characterized in that, this second compensation block more comprises:
One first electric capacity, has a first end and is coupled to this control end that this first end of this driving transistors and one second end are coupled to this first transistor;
Wherein, in this compensated stage, this first control signal ends this switching transistor and this first transistor, and the current potential of this first end of this driving transistors first is capacitively coupled to this low level voltage by this.
4. display according to claim 1, is characterized in that, this first compensation block comprises:
One transistor seconds, has a first end to receive this reference voltage and a control end to receive one first enable signal;
One second electric capacity, has a first end to be coupled to one second end of this transistor seconds and one second end to be coupled to this first end of this driving transistors;
One the 3rd electric capacity, has a first end to be coupled to this second end of this transistor seconds and one second end to be coupled to this control end of this driving transistors; And
One third transistor, have a first end to be coupled to this first end of the 3rd electric capacity, one second end receives one second enable signal or one second control signal with this second end and a control end of being coupled to the 3rd electric capacity;
Wherein, in this reset phase, this this transistor seconds of the first enable signal conducting, this second enable signal or this second control signal end this third transistor, and this first end of this second electric capacity has this reference voltage;
In this compensated stage, this second electric capacity retains this voltage difference;
In this glow phase, this first enable signal ends this transistor seconds, this second enable signal or this this third transistor of the second control signal conducting, this driving transistors is switched on, and the second electric capacity passes through this voltage difference with this control end of this driving transistors after the voltage back of this first end by this driving transistors after conducting to conducting.
5. display according to claim 1, is characterized in that, a cathode terminal of this Organic Light Emitting Diode receives a cathode voltage, and in this reset phase and this compensated stage, this cathode voltage is rocked to a noble potential to end this Organic Light Emitting Diode.
6. display according to claim 1, is characterized in that, a cathode terminal of this Organic Light Emitting Diode receives a fixed negative pole voltage, and this Organic Light Emitting Diode picture element more comprises:
One the 4th transistor, has a first end to be coupled to this anode tap of this Organic Light Emitting Diode, one second end to be coupled to this first end of this driving transistors and a control end to receive one second enable signal;
Wherein, in this reset phase and this compensated stage, this second enable signal ends the 4th transistor, and in this glow phase, this second enable signal conducting the 4th transistor.
7. the driving method of a display, this display comprises a panel, this panel comprises a plurality of Organic Light Emitting Diode picture element, each Organic Light Emitting Diode picture element comprises an Organic Light Emitting Diode, one driving transistors, one switching transistor, one first compensates block and one second compensates block, this driving transistors has a first end to be coupled to an anode tap of this Organic Light Emitting Diode, one second end is to receive an operating voltage, and one control end to receive a data voltage, this switching transistor has a first end to be coupled to this control end of this driving transistors, one second end is to receive this data voltage, and one control end to receive one first control signal, this the first compensation block is coupled to this first end and this control end of this driving transistors, this the second compensation block is coupled to this first end of this driving transistors, and receive this first control signal and this data voltage, the driving method of this display comprises:
In a reset phase, reset this first compensation block and make this first compensation block have a reference voltage and this data voltage, and this first control signal ends this driving transistors by this switching transistor and this second compensation block;
In a compensated stage, this second compensates block and is made by ground to the low level voltage of this first end of this driving transistors this driving transistors suspension joint open to discharge cut-off again, and this first compensates block and retain the voltage of this first end of this driving transistors after ending and a voltage difference of this reference voltage and this data voltage; And
In a glow phase, this Organic Light Emitting Diode of conducting, make the voltage of this first end of this driving transistors be a driving voltage, this voltage difference of the voltage of this first end of this reference voltage and this driving transistors in this compensated stage and this driving voltage are fed back to this control end of this driving transistors by this first compensation block.
8. the driving method of display according to claim 7, it is characterized in that, this the second compensation block comprises a first transistor, this the first transistor has a first end to be coupled to this first end of this driving transistors, one second end to receive this data voltage and a control end to receive this first control signal, and the driving method of this Organic Light Emitting Diode picture element more comprises:
In this reset phase, this this switching transistor of the first control signal conducting and this first transistor make this driving transistors be cut off; And
In this compensated stage, this first control signal ends this switching transistor and this first transistor, and the current potential of this first end of this driving transistors is coupled to this low level voltage by the stray capacitance of this first transistor.
9. the driving method of display according to claim 8, it is characterized in that, this the second compensation block more comprises one first electric capacity, this first electric capacity has a first end and is coupled to this control end that this first end of this driving transistors and one second end are coupled to this first transistor, and the driving method of this Organic Light Emitting Diode picture element more comprises:
In this compensated stage, this first control signal ends this switching transistor and this first transistor, and the current potential of this first end of this driving transistors first is capacitively coupled to this low level voltage by this.
10. the driving method of display according to claim 7, it is characterized in that, this the first compensation block comprises a transistor seconds, one second electric capacity, one the 3rd electric capacity and a third transistor, this transistor seconds has a first end to receive this reference voltage, and one control end to receive one first enable signal, this second electric capacity has a first end to be coupled to one second end of this transistor seconds, and one second end to be coupled to this first end of this driving transistors, 3rd electric capacity has a first end to be coupled to this second end of this transistor seconds, and one second end to be coupled to this control end of this driving transistors, this third transistor has a first end to be coupled to this first end of the 3rd electric capacity, one second end is to be coupled to this second end of the 3rd electric capacity, and one control end receive one second enable signal or one second control signal, the driving method of this Organic Light Emitting Diode picture element more comprises:
In this reset phase, this this transistor seconds of the first enable signal conducting, this second enable signal or this second control signal end this third transistor, and this first end of this second electric capacity has this reference voltage;
In this compensated stage, this second electric capacity retains this voltage difference; And
In this glow phase, this first enable signal ends this transistor seconds, this second enable signal or this this third transistor of the second control signal conducting, this driving transistors is switched on, and the second electric capacity passes through this voltage difference with this control end of this driving transistors after the voltage back of this first end by this driving transistors after conducting to conducting.
The driving method of 11. displays according to claim 7, is characterized in that, a cathode terminal of this Organic Light Emitting Diode receives a cathode voltage, and the driving method of this Organic Light Emitting Diode picture element more comprises:
In this reset phase and this compensated stage, this cathode voltage is rocked to a noble potential to end this Organic Light Emitting Diode.
The driving method of 12. displays according to claim 7, it is characterized in that, one cathode terminal of this Organic Light Emitting Diode receives a fixed negative pole voltage, this Organic Light Emitting Diode picture element more comprises one the 4th transistor, 4th transistor has a first end to be coupled to this anode tap of this Organic Light Emitting Diode, one second end to be coupled to this first end of this driving transistors and a control end to receive one second enable signal, and the driving method of this Organic Light Emitting Diode picture element more comprises:
In this reset phase and this compensated stage, this second enable signal ends the 4th transistor; And
In this glow phase, this second enable signal conducting the 4th transistor.
13. 1 kinds of displays, comprising:
One panel, comprises a plurality of Organic Light Emitting Diode picture element, and each Organic Light Emitting Diode picture element comprises:
One Organic Light Emitting Diode;
One driving transistors, has a first end to be coupled to an anode tap of this Organic Light Emitting Diode, one second end to receive an operating voltage and a control end to receive a data voltage;
One switching transistor, has a first end to be coupled to this control end of this driving transistors, one second end to receive this data voltage and a control end to receive one first control signal;
One first compensates block, is coupled to this second end and this control end of this driving transistors; And
One second compensates block, is coupled to this second end of this driving transistors, and receives this first control signal and this data voltage, wherein:
In a reset phase, this first compensation block is reset and has a reference voltage and data voltage, and this first control signal ends this driving transistors by this switching transistor and this second compensation block;
In a compensated stage, this second compensates block and is made by ground to the low level voltage of this second end of this driving transistors this driving transistors suspension joint open to discharge cut-off again, and this first compensates block and retain the voltage of this second end of this driving transistors after ending and a voltage difference of this reference voltage and this data voltage;
In a glow phase, this Organic Light Emitting Diode is switched on, make the voltage of this second end of this driving transistors be a driving voltage, this voltage difference of the voltage of this second end of this reference voltage and this driving transistors in this compensated stage and this driving voltage are fed back to this control end of this driving transistors by this first compensation block.
14. displays according to claim 13, is characterized in that, this second compensation block comprises:
One the first transistor, has a first end to be coupled to this second end of this driving transistors, one second end to receive this data voltage and a control end to receive this first control signal;
Wherein, in this reset phase, this this switching transistor of the first control signal conducting and this first transistor make this driving transistors be cut off;
In this compensated stage, this first control signal ends this switching transistor and this first transistor, and the current potential of this second end of this driving transistors is coupled to this low level voltage by the stray capacitance of this first transistor.
15. displays according to claim 14, is characterized in that, this second compensation block more comprises:
One first electric capacity, has a first end and is coupled to this control end that this second end of this driving transistors and one second end are coupled to this first transistor;
Wherein, in this compensated stage, this first control signal ends this switching transistor and this first transistor, and the current potential of this second end of this driving transistors first is capacitively coupled to this low level voltage by this.
16. displays according to claim 13, is characterized in that, this first compensation block comprises:
One transistor seconds, has a first end to receive this reference voltage and a control end to receive one first enable signal;
One second electric capacity, has a first end to be coupled to one second end of this transistor seconds and one second end to be coupled to this second end of this driving transistors;
One the 3rd electric capacity, has a first end to be coupled to this second end of this transistor seconds and one second end to be coupled to this control end of this driving transistors; And
One third transistor, have a first end to be coupled to this first end of the 3rd electric capacity, one second end receives one second enable signal or one second control signal with this second end and a control end of being coupled to the 3rd electric capacity;
Wherein, in this reset phase, this this transistor seconds of the first enable signal conducting, this second enable signal or this second control signal end this third transistor, and this first end of this second electric capacity has this reference voltage;
In this compensated stage, this second electric capacity retains this voltage difference;
In this glow phase, this first enable signal ends this transistor seconds, this second enable signal or this this third transistor of the second control signal conducting, this driving transistors is switched on, and the second electric capacity passes through this voltage difference with this control end of this driving transistors of voltage back to conducting of this second end by this driving transistors after conducting.
17. displays according to claim 13, is characterized in that, a cathode terminal of this Organic Light Emitting Diode receives a cathode voltage, and in this reset phase and this compensated stage, this cathode voltage is rocked to a noble potential to end this Organic Light Emitting Diode.
18. displays according to claim 13, is characterized in that, a cathode terminal of this Organic Light Emitting Diode receives a fixed negative pole voltage, and this Organic Light Emitting Diode picture element more comprises:
One the 4th transistor, has a first end to receive this operating voltage, one second end to be coupled to this second end of this driving transistors and a control end to receive one second enable signal;
Wherein, in this reset phase and this compensated stage, this second enable signal ends the 4th transistor, and in this glow phase, this second enable signal conducting the 4th transistor.
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| EP3457393A4 (en) * | 2016-05-11 | 2019-11-06 | BOE Technology Group Co., Ltd. | Pixel circuit, driving method, array substrate, display panel and display device |
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| KR20170074618A (en) | 2015-12-22 | 2017-06-30 | 엘지디스플레이 주식회사 | Sub-pixel of organic light emitting display device and organic light emitting display device including the same |
| CN105845080B (en) * | 2016-05-26 | 2019-09-06 | 上海天马有机发光显示技术有限公司 | A kind of organic light emitting display panel and display equipment |
| KR102458407B1 (en) * | 2017-11-29 | 2022-10-31 | 삼성디스플레이 주식회사 | Pixel and display device having the same |
| CN108376534B (en) * | 2018-03-12 | 2024-04-09 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display panel |
| CN108492785B (en) * | 2018-03-30 | 2019-12-03 | 京东方科技集团股份有限公司 | A kind of pixel-driving circuit and its driving method, display device |
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Address after: 518100 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 4, building 1, building Applicant after: Qunkang Technology (Shenzhen) Co., Ltd. Applicant after: Innolux Display Group Address before: 518100 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 4, building 1, building Applicant before: Qunkang Technology (Shenzhen) Co., Ltd. Applicant before: Chimei Optoelectronics Co., Ltd. |
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