CN103123773A - Amoled pixel driving circuit - Google Patents
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- CN103123773A CN103123773A CN2011103721569A CN201110372156A CN103123773A CN 103123773 A CN103123773 A CN 103123773A CN 2011103721569 A CN2011103721569 A CN 2011103721569A CN 201110372156 A CN201110372156 A CN 201110372156A CN 103123773 A CN103123773 A CN 103123773A
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- 229920001621 AMOLED Polymers 0.000 title claims abstract description 59
- 238000004020 luminiscence type Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 23
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- 239000011159 matrix material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 108010076504 Protein Sorting Signals Proteins 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 238000005401 electroluminescence Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 238000005424 photoluminescence Methods 0.000 description 1
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Abstract
The invention provides an AMOLED pixel driving circuit, which comprises: the AMOLED pixel driving circuit comprises a driving transistor T0, a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a first capacitor C1 and an organic light emitting element OLED, wherein the driving transistor T0 is used for determining a driving current of the AMOLED pixel driving circuit, and the organic light emitting element OLED is used for emitting light to display in response to the driving current. The AMOLED pixel driving circuit can realize the compensation of the threshold voltage offset of the driving transistor, thereby improving the light emitting uniformity and the display quality of an OLED device.
Description
Technical field
The present invention relates to OLED pixel-driving circuit technical field, relate in particular to a kind of AMOLED pixel-driving circuit.
Background technology
OLED, be Organic Light Emitting Diode (Organic Light-Emitting Diode), be called again Organic Electricity laser writer (Organic Electroluminescence Display), refer to luminous organic material under current drives, by the phenomenon of carrier injection and composite guide photoluminescence.The OLED principle of luminosity is respectively as anode and the negative electrode of device with ITO pixel electrode and metal electrode, under certain current drives, electronics and hole are injected into electronics and hole transmission layer from negative electrode and anode respectively, electronics and hole move to luminescent layer through electronics and hole transmission layer respectively, and meet in luminescent layer, form exciton and light emitting molecule is excited, the latter sends visible light through radiative relaxation.
The type of drive of OLED is divided into the active matrix drive (active driving, Active Matrix, AM) that passive-matrix drives (passive drive, Passive matrix, PM) and uses thin film transistor (TFT) (Thin Film Transistor, TFT).In the passive type driving method, anode select the parallel drive row, and in active driving method, TFT is connected to ITO pixel electrode separately and keeps the voltage of driving with the capacitor that the grid that is connected to TFT is arranged perpendicular to negative electrode.
As shown in Figure 1, traditional AMOLED pixel-driving circuit comprises OLED element, driving transistors M1, switching transistor M2 and capacitor C, wherein, the threshold voltage of capacitor C storing driver transistor M1, the source electrode of one end attended operation voltage Vdd and driving transistors M1, the drain electrode of other end connecting valve transistor M2 and the grid of driving transistors M1; The grid of switching transistor M2 connects sweep trace S, source electrode connection data voltage Vdata, and drain electrode connects the grid of driving transistors M1, and the break-make of switching transistor M2 is controlled by sweep trace S, and then controls the input of data voltage Vdata; Driving transistors M1 source electrode attended operation voltage Vdd, drain electrode connects the anode of OLED element, and the negative electrode of OLED connects reference voltage Vss.Data voltage Vdata is fed to the grid of driving transistors M1 by switching transistor M2, to control break-make and the size of current of driving transistors M1, luminous and strong and weak to control the OLED element.Flow through when the OLED element the is luminous electric current I of OLED element
OLEDBe the electric current of driving transistors M1 corresponding to gate source voltage Vgs, electric current I
OLED1 expression of following equation can be arranged.
[equation 1] I
OLED=k (Vgs-Vth)
2=k (Vdd-Vdata-|Vth|)
2
Can find out from equation 1, in above-mentioned AMOLED pixel-driving circuit, electric current I
OLEDThe threshold voltage vt h that depends on driving transistors M1, therefore the variation of the threshold voltage in driving transistors can cause OLED element non-uniform light, affects gray scale and the picture quality of OLED display panel.
Summary of the invention
The object of the present invention is to provide a kind of AMOLED pixel-driving circuit, the threshold voltage shift of energy compensation for drive transistor, the uniformity of luminance of raising OLED device.
For addressing the above problem, the invention provides a kind of AMOLED pixel-driving circuit, comprising:
The first transistor, its first electrode is connected to data-signal, and the second electrode connects the source electrode of a driving transistors;
Transistor seconds, its first electrode connects the bottom crown of the first electric capacity, and the second electrode connects the drain electrode of described driving transistors;
The 3rd transistor, its first electrode connects the drain electrode of described driving transistors, and the second electrode connects an organic illuminating element;
The 4th transistor, its first electrode is connected the source electrode of described driving transistors jointly with the 5th transistorized the second electrode, the described the 5th transistorized the first electrode is connected the top crown of described the first electric capacity jointly with the 6th transistorized the second electrode, the described the 4th transistorized the second electrode connects the first power supply signal, and the described the 6th transistorized the first electrode connects the second source signal.
Further, driving transistors is used for determining the drive current of AMOLED pixel-driving circuit;
The 4th transistor is used for controlling the source electrode that the first power supply signal transfers to driving transistors;
The 3rd transistor is used in the future self-driven current delivery to organic illuminating element;
Organic illuminating element is used for the response drive current and luminescence display;
The 6th transistor is used for controlling the top crown that the second source signal transfers to the first electric capacity;
The 5th transistor is used for controlling the first power supply signal and transfers to the top crown of the first electric capacity and control the top crown that data-signal transfers to the first electric capacity;
The first transistor is used for controlling the transmission of data-signal;
Transistor seconds is used for controlling the grid of driving transistors and the break-make of drain electrode.
Further, described transistor seconds is single gridistor or double gate transistor.
Further, the first to the 5th transistor is the PMOS pipe, and driving transistors is the PMOS pipe, and the 6th transistor is the NMOS pipe.
Further, described the first transistor to the six transistors are respectively by six external drive signal controlling.
Further, described six external drive signals are provided by six sweep traces of AMOLED pixel-driving circuit outside respectively.
Further, the 4th transistor and the 5th transistor are the NMOS pipe, and driving transistors, the first transistor, transistor seconds, the 3rd transistor and the 6th transistor are the PMOS pipe.
Further, the described the 3rd transistorized grid connects first and drives signal, and described the 4th transistor, the 5th transistor and the 6th transistorized grid connect second and drive signal, and described the first transistor is connected grid and is connected the 3rd and drive signal with transistor seconds.
Further, the described the 3rd transistorized grid connects first and drives signal, and described the first transistor, transistor seconds, the 4th transistor, the 5th transistor and the 6th transistorized grid all connect second and drive signal.
Further, described each transistor is the low temperature polycrystalline silicon transistor.
Further, described AMOLED pixel-driving circuit also comprises the second electric capacity, its top crown is connected the bottom crown of described the first electric capacity jointly with the grid of described driving transistors, its bottom crown connects the grid of transistor seconds, be used for raising in described glow phase the grid potential of described driving transistors, reduce the brightness of the black attitude of described organic illuminating element.
Further, the driving sequential of described AMOLED pixel-driving circuit comprises:
Initial phase, the described AMOLED pixel-driving circuit of initialization;
Data input detection-phase detects the threshold voltage of driving transistors and is stored on described the first electric capacity;
Glow phase, the AMOLED pixel-driving circuit produces drive current and provides to organic illuminating element, is used for driving the luminescence display of organic illuminating element.
Further, at initial phase, the negative electrode low-voltage of organic illuminating element transfers to the grid of driving transistors by the 3rd transistor, control its conducting; The first power supply signal transfers to the top crown of the first electric capacity by the 6th transistor.
Further, at data input detection-phase, described data-signal transfers to the bottom crown of the first electric capacity by the first transistor, driving transistors and transistor seconds; The first power supply signal is transported to the top crown of the first electric capacity by the 6th transistor; Described driving transistors ends when the pressure reduction of its grid and source electrode equals its threshold voltage, and during the driving transistors cut-off, its threshold voltage is stored on the first electric capacity.
Further, in glow phase, the first power supply signal transfers to the source electrode of driving transistors by the 4th transistor; The first power supply signal transfers to the top crown of the first electric capacity by the 4th transistor and the 5th transistor; Driving transistors is used for determining the size of drive current, and the 3rd transistor transfers to organic illuminating element with described drive current.
Compared with prior art, AMOLED pixel-driving circuit advantage provided by the present invention is:
1. pixel-driving circuit provided by the invention can be eliminated the threshold voltage of driving transistors to the impact of drive current, makes the demonstration of organic light emitting display more all even stable;
2. pixel-driving circuit provided by the invention in the situation that each transistorized type rationally is set, can reduce drive wire, and driving method, circuit design that makes image element circuit etc. is more convenient;
3. pixel-driving circuit provided by the invention second electric capacity of connecting between the grid of the first electric capacity and transistor seconds, can raise at described glow phase D3 the grid potential of described driving transistors T0, reduce the brightness of the black attitude of described organic illuminating element OLED, improve organic illuminating element OLED display quality;
The transistor that pixel-driving circuit provided by the invention is arranged between driving transistors source electrode and drain electrode is set to double gate transistor, effectively reduces the leakage current of driving transistors, has further improved the reliability of image element circuit.
Description of drawings
Fig. 1 is the structural representation of traditional AMOLED pixel-driving circuit
Fig. 2 is the structural representation of the AMOLED pixel-driving circuit of the embodiment of the present invention one;
Fig. 3 is the driving sequential chart of the AMOLED pixel-driving circuit of the embodiment of the present invention one;
Fig. 4 A to 4C is the current path schematic diagram in each stage under the driving sequential of Fig. 2 of the AMOLED pixel-driving circuit of the embodiment of the present invention one;
Fig. 5 is the structural representation of the AMOLED pixel-driving circuit of the embodiment of the present invention two;
Fig. 6 is the driving sequential chart of the AMOLED pixel-driving circuit of the embodiment of the present invention two.
Embodiment
Below in conjunction with the drawings and specific embodiments, the AMOLED pixel-driving circuit that the present invention proposes is described in further detail.
Embodiment one
As shown in Figure 2, the present embodiment provides a kind of AMOLED pixel-driving circuit, comprise: driving transistors T0, the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4, the 5th transistor T 5, the 6th transistor T 6, the first capacitor C 1 and organic illuminating element OLED, wherein, driving transistors T0 is used for determining the drive current of AMOLED pixel-driving circuit, and organic illuminating element OLED is used for the response drive current and luminescence display.
In the present embodiment, each transistor is the low temperature polycrystalline silicon transistor, and (T1～T5) is the PMOS pipe to the first transistor to the five transistors, driving transistors T0 is the PMOS pipe, and the 6th transistor T 6 is the NMOS pipe, and the first electrode of the first transistor T1 is connected to data-signal Vdata, the second electrode connects the source electrode of driving transistors T0, grid connects first and drives signal S11, is used for response first and drives signal S11, and data-signal Vdata is transferred to first node n1; Its first electrode of transistor seconds T2 connects the bottom crown of the first capacitor C 1, the second electrode connects the drain electrode of described driving transistors T0, bigrid connects second and drives signal S12, is used for response second and drives signal S12, controls the grid of driving transistors T0 and the break-make of drain electrode; The first electrode of the 3rd transistor T 3 connects the drain electrode of described driving transistors T0, the second electrode connects the end of organic illuminating element OLED, grid connects the 3rd and drives signal S13, be used for response the 3rd and drive signal S13, the drive current of self-driven transistor T 0 transfers to organic illuminating element OLED in the future; The second electrode of the 4th transistor T 4 connects the first power supply signal PVDD, the first electrode is connected the source electrode of described driving transistors T0 with the second electrode of the 5th transistor T 5 by first node n1, the grid of the 4th transistor T 4 connects the moving signal S14 of 4 wheel driven, be used for the moving signal S14 of response 4 wheel driven, control the source electrode that the first power supply signal PVDD transfers to driving transistors T0; The first electrode of described the 5th transistor T 5 is connected the top crown of described the first capacitor C 1 with the second electrode of the 6th transistor T 6 jointly by Section Point n2, grid connects the 5th and drives signal S15, be used for response the 5th and drive signal S15, control the first power supply signal PVDD and transfer to the top crown of the first electric capacity and control the top crown that data-signal Vdata transfers to the first capacitor C 1; The first electrode of described the 6th transistor T 6 connects second source signal VREF, and grid connects the 6th and drives signal S16, is used for response the 6th and drives signal S16, controls the top crown that second source signal VREF transfers to the first capacitor C 1.
In the present embodiment, described first drives signal S11, second drives signal S12, the 3rd and drives signal S13, the moving signal S14 of 4 wheel driven, the 5th and drive signal S15 and the 6th and drive signal S16 and provided by six sweep traces of AMOLED pixel-driving circuit outside respectively.
Fig. 3 is the driving signal timing diagram that is applied to the AMOLED pixel-driving circuit of the embodiment of the present invention shown in Figure 2, under driving signal sequence shown in Figure 3, the driving sequential of described AMOLED pixel-driving circuit comprises: initial phase D1, data input detection-phase D2 and glow phase D3.
At first, as shown in Fig. 4 A, at initial phase D1, the first driving signal S11 is low level, the second driving signal S12 is low level, the 3rd driving signal S13 is low level, and the moving signal S14 of 4 wheel driven is high level, and the 5th driving signal S15 is high level, the 6th driving signal S16 is high level, therefore, the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 6th transistor T 6 are opened, and the 4th transistor T 4, the 5th transistor T 5 are turned off.Section Point n2 is also that the current potential of the top crown of the first capacitor C 1 is reset by the 6th transistor T 6, voltage for second source signal VREF, the 3rd node n3 also namely the current potential of the bottom crown of the first capacitor C 1 reset by transistor seconds T2, equal the current potential PVEE of the end of the organic illuminating element OLED that the 3rd transistor T 3 connects.At this moment, the current potential of the first capacitor C 1 top crown equals second source signal VREF, and the current potential of bottom crown equals the first power supply signal PVEE, has completed thus the initialization of described AMOLED pixel-driving circuit.
secondly, as shown in Figure 4 B, at data input detection-phase D2, the first driving signal S11 is low level, the second driving signal S12 is low level, the 3rd driving signal S13 is high level, the moving signal S14 of 4 wheel driven is high level, the 5th driving signal S15 is high level, the 6th driving signal S16 is high level, therefore, the first transistor T1, transistor seconds T2, the 6th transistor T 6 is opened, the 3rd transistor T 3, the 4th transistor T 4, the 5th transistor T 5 is turned off, this moment, the source electrode because of driving transistors T0 was that node n3 is the low-voltage of second source signal VREF, so driving transistors T0 also is in opening.The current potential of first node n1 equals the data-signal Vdata of current input, transistor seconds T2 is opened, grid and the drain electrode short circuit of driving transistors T0 have been caused, the grid potential of driving transistors T0 is drawn high by data-signal Vdata gradually, electrology characteristic according to driving transistors itself, being drawn high when the grid voltage of driving transistors T0 the electricity that equals source electrode to the current potential of its grid is when deducting poor (being Vdata-Vth) of its threshold voltage vt h, driving transistors T0 cut-off; T1 is opened due to the first transistor, the source electrode of driving transistors T0 is connected to data-signal Vdata, so driving transistors T0 is when cut-off, the source electrode (being the current potential of first node n1) that the current potential of its grid (i.e. the current potential of the 3rd node n3) equals driving transistors T0 deducts the threshold voltage vt h of driving transistors T0, the current potential Vn30 of the grid of driving transistors T0 is by equation 2 expressions, that is:
[equation 2] Vn30=Vdata-Vth
Because the 6th transistor T 6 is opened, second source signal VREF is applied to the first capacitor C 1 top crown, and the current potential of the first capacitor C 1 top crown (being the current potential of Section Point n2) equals the input of second source signal VREF, that is:
[equation 3] Vn20=VREF
Then, as shown in Fig. 4 C, at glow phase D3, the first driving signal S11 is high level, and the second driving signal S12 is high level, the 3rd driving signal S13 is low level, the moving signal S14 of 4 wheel driven is low level, and the 5th driving signal S15 is low level, and the 6th driving signal S16 is low level, therefore the 3rd transistor T 3, the 4th transistor T 4, the 5th transistor T 5 are opened, and the first transistor T1, transistor seconds T2, the 6th transistor T 6 are turned off.The current potential of Section Point n2 resets to the first power supply signal PVDD by the 4th transistor T 4 and the 5th transistor T 5, that is:
[equation 4] Vn2=PVDD
Because the voltage difference VC=Vn30-Vn20 between bottom crown on the first capacitor C 1 is constant, so when the current potential of Section Point n2 becomes Vn2=PVDD by the Vn20=VREF saltus step, the current potential of the 3rd node n3 is also that the current potential of the grid of driving transistors T0 is Vn3 by the corresponding saltus step of Vn30, and Vn3 can be represented by the equation 5 that equation [2], equation [3] and equation [4] draw:
[equation 5] Vn3=Vn2+VC=PVDD+Vdata-Vth-VREF
And this moment, because the 4th transistor T 4 is opened, the first power supply signal PVDD is applied to the source electrode of driving transistors T0 by the 4th transistor T 4 and first node n1, and the gate source voltage Vgs of driving transistors T0 can be by equation 6 expressions, that is:
[equation 6] Vgs=Vn1-Vn3=PVDD-(PVDD+Vdata-Vth-VREF)
＝VREF-Vdata+Vth
At glow phase D3, as shown in Fig. 4 C, the 3rd transistor T 3 is opened, and this moment, driving transistors T0 also opened, will be corresponding to the drive current I of the gate source voltage Vgs of driving transistors T0
OLEDBe fed to organic illuminating element OLED, cause organic illuminating element OLED luminous, the drive current I that driving transistors T0 produces
OLEDBy equation 7 expressions, that is:
[equation 7] I
OLED=k (Vgs-Vth)
2=k (VREF-Vdata+Vth-Vth)
2=k (VREF-Vdata)
2
In this equation, I
OLEDThe flow through electric current of organic illuminating element OLED of expression, Vgs represents the gate source voltage of driving transistors T0, and Vth represents the threshold voltage of driving transistors T0, and Vdata represents data-signal (also can claim data voltage), VREF represents the input voltage of second source signal, and k represents constant.Can find out from equation 7, because do not consider the threshold voltage of driving transistors T0, but based on data signal Vdata and second source signal VREF determine drive current I
OLEDSo, can stably drive organic illuminating element OLED luminous and show.
In other embodiments, described the first transistor to the six transistors can also be the transistors of other types, are not limited to this specific embodiment; Described the first transistor to the six transistors are controlled respectively by external signal S11 to S16, described external signal S11 to S16 is provided by 6 sweep traces of AMOLED pixel-driving circuit outside respectively, described external signal S11 to S16 can also coordinate the driving sequential of external circuit, be initial phase D1, data input detection-phase D2 and glow phase D3 can have the interval between three time periods.
As preferred implementation, transistor seconds T2 is double gate transistor in the present embodiment.The effect of transistor seconds T2 is to control the break-make of the electric current between the grid of driving transistors T0 and drain electrode, and generally, transistor still has 10 in the situation that grid applies low-voltage
-12～10
-13The leakage current of V, for fear of the impact on circuit of the leakage current of driving transistors T0, transistor seconds T2 is set to double gate transistor, can effectively reduce leakage current, further improves the reliability of image element circuit.
As preferred implementation, also comprise the second capacitor C 2 in the AMOLED of the present embodiment pixel-driving circuit, its top crown is connected the bottom crown of described the first capacitor C 1 jointly with the grid of described driving transistors T0, its bottom crown connects the grid of transistor seconds T2, be used for raising at described glow phase D3 the grid potential of described driving transistors T0, reduce the brightness of the black attitude of organic illuminating element OLED, improve organic illuminating element OLED display quality.Please refer to particularly Fig. 2, when the second signal that drives signal S12 rises to noble potential from electronegative potential, the current potential of the 4th node n4 is raised, according to principle of charge conservation, the voltage difference at the second capacitor C 2 two ends will be consistent, therefore the 3rd node n3 current potential also corresponding raising be that the grid potential of driving transistors T0 also will improve, the grid that can make driving transistors T0 if the current potential of the 3rd node n3 improves Δ V in the end luminous stage slightly high, can reduce the brightness (Vdata=5V during black attitude) of black attitude, following formula represents:
Ioled
＝k(PVDD-(Vdata-|Vth|+PVDD-Vreff)-|Vth|+ΔV)
2
＝k(Vreff-Data+ΔV)
2
Embodiment two
As shown in Figure 5, the present embodiment provides a kind of AMOLED pixel-driving circuit, comprise: driving transistors T0, the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4, the 5th transistor T 5, the 6th transistor T 6, the first capacitor C 1 and organic illuminating element OLED, wherein, driving transistors T0 is used for determining the drive current of AMOLED pixel-driving circuit, and organic illuminating element OLED is used for the response drive current and luminescence display.
In the present embodiment, each transistor is the low temperature polycrystalline silicon transistor, and the 4th transistor T 4 and the 5th transistor T 5 are the NMOS pipe, and driving transistors T0, the first transistor T1, transistor seconds T2, the 3rd transistor T 3 and the 6th transistor T 6 are the PMOS pipe.The first electrode of the first transistor T1 is connected to data-signal Vdata, and the second electrode connects the source electrode of driving transistors T0, and grid connects second and drives signal S32, is used for response second and drives signal S32, and data-signal Vdata is transferred to first node n1; Transistor seconds T2 is double gate transistor, its first electrode connects the bottom crown of the first capacitor C 1, the second electrode connects the drain electrode of described driving transistors T0, bigrid connects second and drives signal S32, be used for response second and drive signal S32, control the grid of driving transistors T0 and the break-make of drain electrode; The first electrode of the 3rd transistor T 3 connects the drain electrode of described driving transistors T0, the second electrode connects the end of organic illuminating element OLED, grid connects first and drives signal S21, is used for response first and drives signal S21, and self-driven current delivery is to organic illuminating element OLED in the future; The second electrode of the 4th transistor T 4 connects the first power supply signal PVDD, the second electrode is connected the source electrode of described driving transistors T0 with the second electrode of the 5th transistor T 5 by first node n1, grid connects second and drives signal S32, be used for response second and drive signal S32, control the source electrode that the first power supply signal PVDD transfers to driving transistors T0; The first electrode of described the 5th transistor T 5 is connected the top crown of described the first capacitor C 1 with the second electrode of the 6th transistor T 6 jointly by Section Point n2, grid connects second and drives signal S32, be used for response second and drive signal S32, control the first power supply signal PVDD and transfer to the top crown of the first electric capacity and control the top crown that data-signal Vdata transfers to the first capacitor C 1; The first electrode of described the 6th transistor T 6 connects second source signal VREF, and grid connects second and drives signal S32, is used for response second and drives signal S32, controls the top crown that second source signal VREF transfers to the first capacitor C 1.
In the present embodiment, described first drives signal S21 and second drives signal S32 and is provided by two sweep traces of AMOLED pixel-driving circuit outside respectively.
Fig. 6 is the driving signal timing diagram that is applied to the AMOLED pixel-driving circuit of the embodiment of the present invention shown in Figure 5 four, under driving signal sequence shown in Figure 5, the driving sequential of described AMOLED pixel-driving circuit comprises: initial phase D1, data input detection-phase D2 and glow phase D3.
The present embodiment only is that from the difference of embodiment one transistorized type is different and it is different to control each transistorized driving signal, each transistor is at initial phase D1, it is constant that situation is opened in the shutoff of data input detection-phase D2 and glow phase D3, therefore, at glow phase D3, the 3rd transistor T 3 is opened, will be corresponding to the drive current I of the gate source voltage Vgs of driving transistors T0
OLEDBe fed to organic illuminating element OLED, cause organic illuminating element OLED luminous, the drive current I that driving transistors T0 produces
OLED=k (Vgs-Vth)
2=k (VREF-Vdata)
2, wherein, I
OLEDThe flow through electric current of organic illuminating element OLED of expression, Vgs represents the gate source voltage of driving transistors T0, and Vth represents the threshold voltage of driving transistors T0, and Vdata represents data-signal (also can claim data voltage), VREF represents the input voltage of second source signal, and k represents constant.This shows, the present embodiment is not considered the threshold voltage of driving transistors T0 equally, but based on data signal Vdata and second source signal VREF determine drive current I
OLEDSo, can stably drive organic illuminating element OLED luminous and show.
The AMOLED pixel-driving circuit that this enforcement provides is by arranging each transistorized type, the driving signal that makes its use try one's best few, driving method, circuit design that makes pixel-driving circuit etc. is more convenient, but the present invention is not limited to the restriction of above specific embodiment, those skilled in the art give also can pass through additive method on the basis of the disclosure of invention, each transistor types and the type of drive of pixel-driving circuit rationally are set, reduce the driving signal of pixel-driving circuit, reach the purpose of simplifying circuit.
In sum, AMOLED pixel-driving circuit provided by the present invention, access and disconnection by the first to the 6th transistorized switch and first, second power supply signal, make the drive current size that transfers to organic illuminating element only relevant with the second source signal with data-signal, and then realized the threshold voltage compensation of driving transistors, improved uniformity of luminance and the display quality of OLED device.
Claims (14)
1. an AMOLED pixel-driving circuit, is characterized in that, comprising:
The first transistor, its first electrode is connected to data-signal, and the second electrode connects the source electrode of a driving transistors;
Transistor seconds, its first electrode connects the bottom crown of the first electric capacity, and the second electrode connects the drain electrode of described driving transistors;
The 3rd transistor, its first electrode connects the drain electrode of described driving transistors, and the second electrode connects an organic illuminating element;
The 4th transistor, its first electrode is connected the source electrode of described driving transistors jointly with the 5th transistorized the second electrode, the described the 5th transistorized the first electrode is connected the top crown of described the first electric capacity jointly with the 6th transistorized the second electrode, the described the 4th transistorized the second electrode connects the first power supply signal, and the described the 6th transistorized the first electrode connects the second source signal.
2. AMOLED pixel-driving circuit as claimed in claim 1 is characterized in that:
Driving transistors is used for determining the drive current of AMOLED pixel-driving circuit;
The 4th transistor is used for controlling the source electrode that the first power supply signal transfers to driving transistors;
The 3rd transistor is used in the future, and self-driven transistorized drive current transfers to organic illuminating element;
Organic illuminating element is used for the response drive current and luminescence display;
The 6th transistor is used for controlling the top crown that the second source signal transfers to the first electric capacity;
The 5th transistor is used for controlling the first power supply signal and transfers to the top crown of the first electric capacity and control the top crown that data-signal transfers to the first electric capacity;
The first transistor is used for controlling the transmission of data-signal;
Transistor seconds is used for controlling the grid of driving transistors and the break-make of drain electrode.
3. AMOLED pixel-driving circuit as claimed in claim 1, it is characterized in that: described transistor seconds is single gridistor or double gate transistor.
4. AMOLED pixel-driving circuit as claimed in claim 1, is characterized in that, the first transistor to the five transistors are the PMOS pipe, and driving transistors is the PMOS pipe, and the 6th transistor is the NMOS pipe.
5. AMOLED pixel-driving circuit as claimed in claim 4, is characterized in that, described the first transistor to the six transistors are respectively by six external drive signal controlling.
6. AMOLED pixel-driving circuit as claimed in claim 5, is characterized in that, described six external drive signals are provided by six sweep traces of AMOLED pixel-driving circuit outside respectively.
7. AMOLED pixel-driving circuit as claimed in claim 1, is characterized in that, the 4th transistor and the 5th transistor are the NMOS pipe, and driving transistors, the first transistor, transistor seconds, the 3rd transistor and the 6th transistor are the PMOS pipe.
8. AMOLED pixel-driving circuit as claimed in claim 7, it is characterized in that, the described the 3rd transistorized grid connects first and drives signal, and described the first transistor, transistor seconds, the 4th transistor, the 5th transistor and the 6th transistorized grid all connect second and drive signal.
9. AMOLED pixel-driving circuit as claimed in claim 1, is characterized in that, described each transistor is the low temperature polycrystalline silicon transistor.
10. AMOLED pixel-driving circuit as claimed in claim 1, it is characterized in that, also comprise the second electric capacity, its top crown is connected the bottom crown of described the first electric capacity jointly with the grid of described driving transistors, its bottom crown connects the grid of transistor seconds, be used for raising in described glow phase the grid potential of described driving transistors, reduce the brightness of the black attitude of described organic illuminating element.
11. AMOLED pixel-driving circuit as described in any one in claim 1 to 10 is characterized in that, the driving sequential of described AMOLED pixel-driving circuit comprises:
Initial phase, the described AMOLED pixel-driving circuit of initialization;
Data input detection-phase detects the threshold voltage of driving transistors and is stored on described the first electric capacity;
Glow phase, the AMOLED pixel-driving circuit produces drive current and provides to organic illuminating element, is used for driving the luminescence display of organic illuminating element.
12. AMOLED pixel-driving circuit as claimed in claim 11 is characterized in that, at initial phase, the negative electrode low-voltage of organic illuminating element transfers to the grid of driving transistors by the 3rd transistor, control its conducting; The first power supply signal transfers to the top crown of the first electric capacity by the 6th transistor.
13. AMOLED pixel-driving circuit as claimed in claim 11 is characterized in that, at data input detection-phase, described data-signal transfers to the bottom crown of the first electric capacity by the first transistor, driving transistors and transistor seconds; The first power supply signal is transported to the top crown of the first electric capacity by the 6th transistor; Described driving transistors ends when the pressure reduction of its grid and source electrode equals its threshold voltage.
14. AMOLED pixel-driving circuit as claimed in claim 11 is characterized in that, in glow phase, the first power supply signal transfers to the source electrode of driving transistors by the 4th transistor; The first power supply signal transfers to the top crown of the first electric capacity by the 4th transistor and the 5th transistor; Driving transistors is used for determining the size of drive current, and the 3rd transistor transfers to organic illuminating element with described drive current.
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