CN105139802A - AMOLED pixel driving circuit and method realizing voltage and current mixed programming - Google Patents
AMOLED pixel driving circuit and method realizing voltage and current mixed programming Download PDFInfo
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- 229920001621 AMOLED Polymers 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 239000010409 thin film Substances 0.000 claims description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
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Abstract
The invention provides an AMOLED pixel driving circuit and method realizing voltage and current mixed programming. The AMOLED pixel driving circuit comprises a driving transistor, a first switch transistor, a second switch transistor, a third switch transistor, a capacitor and an organic light-emitting diode. In the programming stage, pixel units are programmed row by row, the first and second switch transistors are switched on in the programming process, the third switch transistor is switched off, a current flows from the driving transistor, the first and second switch transistors to a fixed current signal, and after the programming is finished, the first and second switch transistors are switched off, and the programming of a next row is started; and in a light-emitting stage, the first and second switch transistors are switched off, the third switch transistor is switched on, the current flows from the driving transistor and the third switch transistor to the organic light-emitting diode, and the organic light-emitting diode is driven for emitting light. Through a voltage and current mixed programming mode, comprehensive compensation is carried out on each non-ideal factor of AMOLED pixels, and the programming speed is relatively high, so that the AMOLED pixel driving circuit and method are good in display effect and high in response speed.
Description
Technical Field
The invention relates to the technical field of display driving, in particular to a voltage and current hybrid programming AMOLED pixel driving circuit and method.
Background
In recent years, Active-matrix organic light-emitting diode (AMOLED) displays have become a strong competitor to next generation display technologies. The AMOLED has the advantages of fast response time, high contrast, large visual angle and the like.
As shown in fig. 1, the most basic light emitting pixel structure of the AMOLED is a 2T1C structure (two transistors and one capacitor), and the pixel of 2T1C structure includes: driving transistor T connected to organic light emitting diode DdDriving transistor TdIs connected to the gate via a capacitor C, while driving a transistor TdThe gate of the switching transistor T1 is connected with the drain of the switching transistor T1, the gate is connected with the SCAN signal SCAN, and the source is connected with the data signal Vdata. The input data signal V is stored by the capacitor C during operationdataFinally through the drive transistor TdGenerating a driving current to control the brightness of the organic light emitting diode D. In actual operation, the current flowing through the organic light emitting diode D is not limited by the input numberAccording to signal VdataIs also controlled by, for example, the drive transistor TdThreshold voltage drift, mobility drift, aging of the organic light emitting diode, voltage drop generated by parasitic resistance on a power supply and other factors, so that the uniformity of display is poor.
The current solution to the display uniformity is to add additional transistors in the pixels to compensate for the above-mentioned non-ideal factors, but to compensate for the above factors, a larger number of transistors need to be added, so that the area of the organic light emitting diode is reduced and the light emitting efficiency of the pixels is reduced under the condition that the pixel size is fixed. In some pixel structures with a small number of transistors, the compensation factor cannot be achieved.
Therefore, another better compensation method is to use current programming, and the pixel directly copies the input current to the organic light emitting diode to control the brightness of the light. FIG. 2 shows a current input type pixel structure including a driving transistor T having a drain connected to an organic light emitting diode DdDriving transistor TdIs connected to the power supply VDD through the switching transistor T2, and the gate of the switching transistor T2 is connected to the control signal EM; drive transistor TdIs connected to the drain through a switching transistor T3 and is also connected to the source through a capacitor C; drive transistor TdIs further connected to the source of the switching transistor T1, the drain of the switching transistor T1 is connected to the data signal IdataAnd a gate connected to the gate of the switching transistor T3 and to the SCAN signal SCAN. As shown in fig. 2 to 3, during the programming process, the control signal EM is at a high level, and the switching transistor T2 is turned off; the SCAN signal SCAN is low, the switching transistor T1 and the switching transistor T3 are turned on, IdataFlow-through driving transistor TdAnd an organic light emitting diode D, and a driving transistor TdV ofGSThe voltage is stored on the capacitor C; then, in the light emitting stage, the control signal EM is at a low level, and the switching transistor T2 is turned off; the SCAN signal SCAN is high, and the switching transistor T1 and the switching transistor T3 are turned on directly by V stored in the capacitor CGSVoltage-driving the driving crystalPipe TdAnd accurate driving current is generated.
However, the general current input type pixel has a problem of IdataSince the input current is small when the luminance is small, the speed of programming the pixel is slow, and the programming time is long, which may result in the overall resolution of the screen being reduced or the response speed being reduced. Otherwise, the programming operation cannot be completed within a predetermined time, and the display accuracy is lowered.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a voltage-current hybrid programming AMOLED pixel driving circuit and method, which are used to solve the problems of poor pixel display uniformity, low resolution, slow response speed, low display accuracy, and the like in the prior art.
To achieve the above and other related objects, the present invention provides a voltage-current hybrid programming AMOLED pixel driving circuit, comprising:
the driving transistor, the first switching transistor, the second switching transistor, the third switching transistor, the capacitor and the organic light emitting diode; wherein,
a first electrode of the driving transistor is connected with a first power supply signal, a grid electrode of the driving transistor is connected with a first end of the capacitor, a first electrode of the first switching transistor and a second electrode of the second switching transistor, a second electrode of the driving transistor is connected with a second electrode of the first switching transistor and a first electrode of the third switching transistor, and a second end of the capacitor is connected with a data signal;
the grid electrode of the first switch transistor is connected with a first control signal;
the grid electrode of the second switching transistor is connected with the first control signal, and the first electrode of the second switching transistor is connected with a fixed current signal;
the grid electrode of the third switching transistor is connected with a second control signal, the second electrode of the third switching transistor is connected with the first end of the organic light-emitting diode, and the second end of the organic light-emitting diode is connected with a second power supply signal.
Preferably, the first electrode is a source electrode, the second electrode is a drain electrode, the driving transistor, the first switching transistor, the second switching transistor and the third switching transistor are P-type transistors, and the first end of the organic light emitting diode is an anode and the second end of the organic light emitting diode is a cathode.
Preferably, the first electrode is a drain electrode, the second electrode is a source electrode, the driving transistor, the first switching transistor, the second switching transistor and the third switching transistor are N-tubes, the first end of the organic light emitting diode is a cathode, and the second end of the organic light emitting diode is an anode.
Preferably, the first switch transistor, the second switch transistor and the third switch transistor are one of a polysilicon thin film transistor, an amorphous silicon thin film transistor, a zinc oxide-based thin film transistor or an organic thin film transistor.
To achieve the above and other related objects, the present invention provides a driving method of an AMOLED pixel driving circuit with voltage-current hybrid programming, including at least:
and (3) programming stage: programming the pixel units row by row, wherein the first switch transistor and the second switch transistor are turned on during programming, the third switch transistor is turned off, current flows from the driving transistor, the first switch transistor and the second switch transistor to the fixed current signal, and after the programming is finished, the first switch transistor and the second switch transistor are turned off to start the programming of the next row;
a light emitting stage: the first switching transistor and the second switching transistor are turned off, the third switching transistor is turned on, current flows from the driving transistor and the third switching transistor to the organic light emitting diode, and the driving transistor drives the organic light emitting diode to emit light.
Preferably, in the programming stage, the gate voltage of the driving transistor satisfies the following relation:
wherein, VAIs the gate voltage of the drive transistor, VDDIs the supply voltage, VthIs the threshold voltage of the drive transistor, IfixIs the value of the fixed current signal, mu is the carrier mobility, COXIs the gate oxide capacitance per unit area, L is the channel length of the driving transistor, and W is the channel width of the driving transistor.
Preferably, in the light emitting stage, the gate voltage of the driving transistor satisfies the following relation:
wherein, VA' is the gate voltage, V, of the drive transistorDDIs the supply voltage, VthIs the threshold voltage of the drive transistor, IfixIs the value of the fixed current signal, mu is the carrier mobility, COXIs the gate oxide capacitance per unit area, L is the channel length of the driving transistor, W is the channel width of the driving transistor, Vref is the value of the data signal during the light emission phase, and D1 is the value of the data signal during the programming phase.
Preferably, in the light emitting stage, the current flowing through the organic light emitting diode satisfies the following relation:
wherein, IOLEDIs the current flowing through the organic light emitting diode, VDDIs the supply voltage, VthIs the threshold voltage of the drive transistor, mu is the carrier mobility, COXIs gate oxide capacitance per unit area, L is channel length of the drive transistor, W is channel width of the drive transistor, IfixIs the value of the fixed current signal, Δ VD1Is the difference of the data signals in the light emitting phase and the programming phase.
As described above, the voltage-current hybrid programming AMOLED pixel driving circuit and method of the present invention have the following advantages:
the voltage-current hybrid programming AMOLED pixel driving circuit and method provided by the invention compensate various non-ideal factors of the AMOLED pixel in a voltage-current hybrid programming mode, have a high programming speed, and ensure both the display effect and the response speed.
Drawings
Fig. 1 shows a schematic diagram of a pixel structure of 2T1C in the prior art.
Fig. 2 is a schematic diagram of a current input type pixel structure in the prior art.
Fig. 3 is a timing diagram of a current input pixel structure in the prior art.
Fig. 4 is a schematic structural diagram of the voltage-current hybrid-programmed AMOLED pixel driving circuit according to the present invention.
Fig. 5 is a timing diagram of the voltage-current hybrid-programmed AMOLED pixel driving circuit according to the present invention.
Description of the element reference numerals
TdDriving transistor
T1-T3 switching transistor
C capacitor
D organic light emitting diode
VdataData signal
IdataData signal
SCAN, SCAN [1] to SCAN [ n ] SCAN signals
EM control signal
IfixFixed current signal
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 4-5. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 4, the present invention provides a voltage-current hybrid programming AMOLED pixel driving circuit, which at least includes:
drive transistor TdA first switching transistor T1, a second switching transistor T2, a third switching transistor T3, a capacitor C and an organic light emitting diode D; wherein,
the driving transistor TdA gate electrode connected to a first terminal of the capacitor C, a first electrode of the first switching transistor T1 and a second electrode of the second switching transistor T2, a second electrode connected to a second electrode of the first switching transistor T1 and a first electrode of the third switching transistor T3, and a second terminal of the capacitor C connected to a data signal Vdata；
The gate of the first switching transistor T1 is connected to a first control signal, in this embodiment, a SCAN signal SCAN;
the gate of the second switching transistor T2 is connected to the SCAN signal SCAN, and the first electrode is connected to the fixed current signal Ifix；
The first control signals of each row of the pixel units are the first SCAN signal SCAN [1], the second SCAN signal SCAN [2], the third SCAN signal SCAN [3] … … nth SCAN signal SCAN [ n ];
the gate of the third switching transistor T3 is connected to a second control signal EM, which is a square wave signal and is used to control the operating state of the voltage-current hybrid-programmed AMOLED pixel driving circuit; the second electrode of the third switching transistor T3 is connected to the first terminal of the organic light emitting diode D, and the second terminal of the organic light emitting diode D is connected to the second power signal.
Specifically, if the first electrode is a source and the second electrode is a drain, the driving transistor T is turned ondThe first switch transistor T1, the second switch transistor T2, and the third switch transistor T3 are P-type transistors, and the first end of the organic light emitting diode D is an anode and the second end is a cathode; if the first electrode is a drain and the second electrode is a source, the driving transistor TdThe first switching transistor T1, the second switching transistor T2, and the third switching transistor T3 are N-tubes, and the first end of the organic light emitting diode D is a cathode and the second end thereof is an anode.
Specifically, the first switching transistor T1, the second switching transistor T2, and the third switching transistor T3 are used as switching transistors, and any type of transistors may be selected to perform a switching function, including one of a polysilicon thin film transistor, an amorphous silicon thin film transistor, a zinc oxide-based thin film transistor, or an organic thin film transistor.
The invention also provides a driving method of the voltage-current hybrid programming AMOLED pixel driving circuit, and in the embodiment, the driving transistor TdThe first switch transistor T1, the second switch transistor T2, and the third switch transistor T3 are P-type transistors, the first electrode is defined as a source electrode, the second electrode is defined as a drain electrode, and the first end of the organic light emitting diode D is an anode and the second end is a cathode. In this embodiment, the first power signal is a power voltage VDD, and the second power signal is a ground GND. The driving method of the voltage-current hybrid programming AMOLED pixel driving circuit at least comprises the following steps:
and (3) programming stage: the first and second switching transistors T1 and T2 are turned on, the third switching transistor T3 is turned off, and current flows from the driving transistor TdThe firstThe switching transistor T1 and the second switching transistor T2 flow to the fixed current signal Ifix。
Specifically, as shown in fig. 3 to 4, the second control signal EM is at a high level, and the third switching transistor T3 is turned off. In the present embodiment, taking the first row of the pixel unit as an example, the first SCAN signal SCAN [1]]The first and second switching transistors T1 and T2 are turned on for a low level pulse, and the data signal V is turned ondataIs D1. Current is passed from the drive transistor TdThe first and second switching transistors T1 and T2 flow to the fixed current signal IfixThe said constant current signal IfixFor a fixed large current, the driving transistor TdThe gate voltage of (i.e., node a in fig. 4) satisfies the following relationship:
namely, it is <math>
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Wherein, VAIs the gate voltage of the driving transistor Td; vDDIs the supply voltage; vthIs the threshold voltage of the driving transistor Td, less than 0; i isfixIs the value of the fixed current signal; μ is the carrier mobility; cOXIs a gate oxide capacitance per unit area; l is a channel length of the driving transistor Td; w is a channel width of the driving transistor Td.
After the first row of the pixel units is programmed, the first SCAN signal SCAN [1] returns to the high level, the first switch transistor T1 and the second switch transistor T2 are turned off, the first control signal sends out low-level pulses row by row, and the second row and the third row are programmed sequentially.
A light emitting stage: the first and second switching transistors T1 and T2 are turned off, the third switching transistor T3 is turned on, and current flows from the driving transistor TdThe third switching transistor T3 flows to the organic light emitting diode D, and the driving transistor Td drives the organic light emitting diode D to emit light.
Specifically, as shown in fig. 3 to 4, the second control signal EM is at a low level, and the third switching crystal is at a low levelThe pipe T3 is opened. In the present embodiment, taking the first row of the pixel unit as an example, the first SCAN signal SCAN [1]]At a high level, the first and second switching transistors T1 and T2 are turned off, and at this time, the data signal VdataVoltage V at a fixed levelref. The left side of the capacitor C and the data signal VdataConnected, the voltage jumps from D1 to VrefAnd the right side is connected with the node A and is in a floating state, so that the voltage can be coupled and jump, and the driving transistor TdThe gate voltage of (i.e., node a in fig. 4) eventually becomes:
current is passed from the drive transistor TdThe third switching transistor T3 flows to the organic light emitting diode D, the driving transistor TdDriving the organic light emitting diode D to emit light, wherein the current flowing through the organic light emitting diode D satisfies the following relation:
wherein, IOLEDΔ V is the current flowing through the organic light emitting diode DD1Is the difference of the data signals in the light emitting phase and the programming phase.
Accordingly, the current finally flowing through the organic light emitting diode D and the driving transistor T are determineddThreshold voltage V ofthThe power supply voltage VDD and the turn-on threshold voltage of the OLED D are independent of each otherCan compensate the change of the carrier mobility mu to a certain degree, and finally the current I flowing through the organic light-emitting diode DOLEDControl ofThe voltage is Vref-D1, i.e. Δ VD1Is determined, therefore, by controlling Δ VD1The lighting operation of the panel can be realized.
The voltage and current hybrid programming AMOLED pixel driving circuit and method provided by the invention have the advantages of good display effect and high response speed because the voltage and current hybrid programming AMOLED pixel driving circuit and method comprehensively compensate various non-ideal factors of the AMOLED pixel in a voltage and current hybrid programming mode and have higher programming speed.
In summary, the present invention provides a voltage-current hybrid programming AMOLED pixel driving circuit and method, including: the driving circuit comprises a driving transistor, a first switching transistor, a second switching transistor, a third switching transistor, a capacitor and an organic light emitting diode. And (3) programming stage: programming the pixel units row by row, wherein the first switch transistor and the second switch transistor are turned on during programming, the third switch transistor is turned off, current flows from the driving transistor, the first switch transistor and the second switch transistor to the fixed current signal, and after the programming is finished, the first switch transistor and the second switch transistor are turned off to start the programming of the next row; a light emitting stage: the first switching transistor and the second switching transistor are turned off, the third switching transistor is turned on, current flows from the driving transistor and the third switching transistor to the organic light emitting diode, and the driving transistor drives the organic light emitting diode to emit light. The voltage and current hybrid programming AMOLED pixel driving circuit and method provided by the invention have the advantages of good display effect and high response speed because the voltage and current hybrid programming AMOLED pixel driving circuit and method comprehensively compensate various non-ideal factors of the AMOLED pixel in a voltage and current hybrid programming mode and have higher programming speed. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. An AMOLED pixel drive circuit with voltage-current hybrid programming, the AMOLED pixel drive circuit comprising at least:
the driving transistor, the first switching transistor, the second switching transistor, the third switching transistor, the capacitor and the organic light emitting diode; wherein,
a first electrode of the driving transistor is connected with a first power supply signal, a grid electrode of the driving transistor is connected with a first end of the capacitor, a first electrode of the first switching transistor and a second electrode of the second switching transistor, a second electrode of the driving transistor is connected with a second electrode of the first switching transistor and a first electrode of the third switching transistor, and a second end of the capacitor is connected with a data signal;
the grid electrode of the first switch transistor is connected with a first control signal;
the grid electrode of the second switching transistor is connected with the first control signal, and the first electrode of the second switching transistor is connected with a fixed current signal;
the grid electrode of the third switching transistor is connected with a second control signal, the second electrode of the third switching transistor is connected with the first end of the organic light-emitting diode, and the second end of the organic light-emitting diode is connected with a second power supply signal.
2. The voltage-current hybrid programmed AMOLED pixel drive circuit of claim 1, wherein: the first electrode is a source electrode, the second electrode is a drain electrode, the driving transistor, the first switch transistor, the second switch transistor and the third switch transistor are P tubes, the first end of the organic light emitting diode is an anode, and the second end of the organic light emitting diode is a cathode.
3. The voltage-current hybrid programmed AMOLED pixel drive circuit of claim 1, wherein: the first electrode is a drain electrode, the second electrode is a source electrode, the driving transistor, the first switch transistor, the second switch transistor and the third switch transistor are N tubes, the first end of the organic light emitting diode is a cathode, and the second end of the organic light emitting diode is an anode.
4. The voltage-current hybrid programmed AMOLED pixel drive circuit of claim 1, wherein: the first switch transistor, the second switch transistor and the third switch transistor are one of a polycrystalline silicon thin film transistor, an amorphous silicon thin film transistor, a zinc oxide-based thin film transistor or an organic thin film transistor.
5. A driving method of an AMOLED pixel driving circuit with voltage-current hybrid programming according to any one of claims 1-4, wherein the driving method comprises:
and (3) programming stage: programming the pixel units row by row, wherein the first switch transistor and the second switch transistor are turned on during programming, the third switch transistor is turned off, current flows from the driving transistor, the first switch transistor and the second switch transistor to the fixed current signal, and after the programming is finished, the first switch transistor and the second switch transistor are turned off to start the programming of the next row;
a light emitting stage: the first switching transistor and the second switching transistor are turned off, the third switching transistor is turned on, current flows from the driving transistor and the third switching transistor to the organic light emitting diode, and the driving transistor drives the organic light emitting diode to emit light.
6. The voltage-current hybrid programmed AMOLED pixel driving method of claim 5, wherein: in a programming phase, the gate voltage of the driving transistor satisfies the following relation:
wherein, VAIs the gate voltage of the drive transistor, VDDIs the supply voltage, VthIs the threshold voltage of the drive transistor, IfixIs the value of the fixed current signal, mu is the carrier mobility, COXIs the gate oxide capacitance per unit area, L is the channel length of the driving transistor, and W is the channel width of the driving transistor.
7. The voltage-current hybrid programmed AMOLED pixel driving method of claim 5, wherein: in the light emitting stage, the gate voltage of the driving transistor satisfies the following relation:
wherein, VA' is the gate voltage, V, of the drive transistorDDIs the supply voltage, VthIs the threshold voltage of the drive transistor, IfixFor the fixed current signalValue of (a), mu is the carrier mobility, COXIs the gate oxide capacitance per unit area, L is the channel length of the driving transistor, W is the channel width of the driving transistor, Vref is the value of the data signal during the light emission phase, and D1 is the value of the data signal during the programming phase.
8. The voltage-current hybrid programmed AMOLED pixel driving method of claim 5, wherein: in the light emitting stage, the current flowing through the organic light emitting diode satisfies the following relation:
wherein, IOLEDIs the current flowing through the organic light emitting diode，VDDIs the supply voltage, VthIs the threshold voltage of the drive transistor, mu is the carrier mobility, COXIs gate oxide capacitance per unit area, L is channel length of the drive transistor, W is channel width of the drive transistor, IfixIs the value of the fixed current signal, Δ VD1Is the difference of the data signals in the light emitting phase and the programming phase.
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| CN111710304A (en) * | 2020-07-17 | 2020-09-25 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
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Application publication date: 20151209 |