CN103123773B - AMOLED pixel-driving circuit - Google Patents

AMOLED pixel-driving circuit Download PDF

Info

Publication number
CN103123773B
CN103123773B CN201110372156.9A CN201110372156A CN103123773B CN 103123773 B CN103123773 B CN 103123773B CN 201110372156 A CN201110372156 A CN 201110372156A CN 103123773 B CN103123773 B CN 103123773B
Authority
CN
China
Prior art keywords
transistor
driving
electrode
amoled pixel
driving circuit
Prior art date
Application number
CN201110372156.9A
Other languages
Chinese (zh)
Other versions
CN103123773A (en
Inventor
曾章和
丛姗姗
钱栋
顾寒昱
孔祥梓
Original Assignee
上海天马微电子有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海天马微电子有限公司 filed Critical 上海天马微电子有限公司
Priority to CN201110372156.9A priority Critical patent/CN103123773B/en
Publication of CN103123773A publication Critical patent/CN103123773A/en
Application granted granted Critical
Publication of CN103123773B publication Critical patent/CN103123773B/en

Links

Abstract

The present invention provides a kind of AMOLED pixel-driving circuit, including: drive transistor T0, the first transistor T1, transistor seconds T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, the first electric capacity C1 and organic illuminating element OLED, wherein, driving transistor T0 for determining the driving electric current of AMOLED pixel-driving circuit, organic illuminating element OLED is used for responding driving electric current and luminescence display.The AMOLED pixel-driving circuit of the present invention can achieve the compensation to drive transistor threshold voltage skew, and then improves uniformity of luminance and the display quality of OLED.

Description

AMOLED pixel-driving circuit

Technical field

The present invention relates to OLED pixel drive circuit technical field, particularly relate to a kind of AMOLED pixel-driving circuit.

Background technology

OLED, i.e. Organic Light Emitting Diode (OrganicLight-EmittingDiode), it is also called Organic Electricity laser writer (OrganicElectroluminescenceDisplay), refer to that luminous organic material, under electric current drives, is injected by carrier and the phenomenon of composite guide photoluminescence.OLED principle of luminosity is respectively as the anode of device and negative electrode with ITO pixel electrode and metal electrode, under certain electric 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 respectively through electronics and hole transmission layer, and meet in luminescent layer, forming exciton and make light emitting molecule excite, the latter sends visible ray through radiative relaxation.

The type of drive of OLED is divided into passive-matrix to drive (passive drive, Passivematrix, PM) and the active matrix drive (active matrix driving of use thin film transistor (TFT) (ThinFilmTransistor, TFT), ActiveMatrix, AM).In passive type driving method, anode is perpendicular to negative electrode, selects parallel drive row, and in active driving method, TFT is connected to respective ITO pixel electrode and to have the capacitor of the grid being connected to TFT to maintain the voltage of driving.

As shown in Figure 1, traditional AMOLED pixel-driving circuit includes OLED element, drives transistor M1, switching transistor M2 and capacitor C, wherein, capacitor C storage drives the threshold voltage of transistor M1, one end attended operation voltage Vdd and the source electrode of driving transistor M1, the drain electrode of other end connecting valve transistor M2 and the grid of driving transistor M1;The grid of switching transistor M2 connects scan line S, and source electrode connects data voltage Vdata, and drain electrode connects the grid driving transistor M1, and the break-make of switching transistor M2 is controlled by scan line S, and then controls the input of data voltage Vdata;Driving transistor M1 source electrode attended operation voltage Vdd, drain electrode to connect the anode of OLED element, the negative electrode of OLED connects reference voltage Vss.Data voltage Vdata is fed to drive the grid of transistor M1 by switching transistor M2, to control to drive break-make and the size of current of transistor M1, luminous and strong and weak to control OLED element.The electric current I of OLED element is flowed through during OLED element luminescenceOLEDFor driving transistor M1 corresponding to the electric current of gate source voltage Vgs, electric current IOLEDEquation 1 below can be had to represent.

[equation 1] IOLED=k (Vgs-Vth)2=k (Vdd-Vdata-| Vth |)2

From equation 1 it can be seen that above-mentioned AMOLED pixel-driving circuit, electric current IOLEDDepending on the threshold voltage vt h driving transistor M1, therefore the change of the threshold voltage in driving transistor can cause OLED element non-uniform light, affects gray scale and the picture quality of OLED display panel.

Summary of the invention

It is an object of the invention to provide a kind of AMOLED pixel-driving circuit, the threshold voltage shift of energy compensation for drive transistor, improve the uniformity of luminance of OLED.

For solving the problems referred to above, the present invention provides a kind of AMOLED pixel-driving circuit, including:

The first transistor, its first electrode is connected to data signal, and the second electrode connects the source electrode of a driving transistor;

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 transistor;

Third transistor, its first electrode connects the drain electrode of described driving transistor, and the second electrode connects an organic illuminating element;

4th transistor, second electrode of its first electrode and the 5th transistor connects the source electrode of described driving transistor jointly, described first electrode of the 5th transistor and the second electrode of the 6th transistor connect the top crown of described first electric capacity jointly, second electrode of described 4th transistor connects the first power supply signal, and the first electrode of described 6th transistor connects second source signal.

Further, drive transistor for determining the driving electric current of AMOLED pixel-driving circuit;

4th transistor is for controlling the first power supply signal transmission to the source electrode driving transistor;

Third transistor is streamed to organic illuminating element for self-driven electricity in the future;

Organic illuminating element is used for responding driving electric current and luminescence display;

6th transistor transmits the top crown to the first electric capacity for controlling second source signal;

5th transistor is for controlling the top crown of the first power supply signal transmission to the first electric capacity and controlling data signal transmission to the top crown of the first electric capacity;

The first transistor is for controlling the transmission of data signal;

Transistor seconds is for controlling to drive grid and the break-make of drain electrode of transistor.

Further, described transistor seconds is single gridistor or double gate transistor.

Further, the first to the 5th transistor is PMOS, and driving transistor is PMOS, and the 6th transistor is NMOS tube.

Further, described the first transistor is controlled by six external drive signals respectively to the 6th transistor.

Further, described six external drive signals are provided by six scan lines outside AMOLED pixel-driving circuit respectively.

Further, the 4th transistor and the 5th transistor are NMOS tube, and driving transistor, the first transistor, transistor seconds, third transistor and the 6th transistor is PMOS.

Further, the grid of described third transistor connects the first driving signal, and the grid of described 4th transistor, the 5th transistor and the 6th transistor connects two driving signal, and the grid of described the first transistor and transistor seconds connects the 3rd driving signal.

Further, the grid of described third transistor connects the first driving signal, and the grid of described the first transistor, transistor seconds, the 4th transistor, the 5th transistor and the 6th transistor is all connected with two driving signal.

Further, described each transistor is low-temperature polycrystalline silicon transistor.

Further, described AMOLED pixel-driving circuit also includes the second electric capacity, its top crown is connected the bottom crown of described first electric capacity jointly with the grid of described driving transistor, its bottom crown connects the grid of transistor seconds, for raising the grid potential of described driving transistor in described glow phase, reduce the brightness of the black state of described organic illuminating element.

Further, the driver' s timing of described AMOLED pixel-driving circuit includes:

Initial phase, initializes described AMOLED pixel-driving circuit;

Data input detection-phase, detects and drives the threshold voltage of transistor and store to described first electric capacity;

Glow phase, AMOLED pixel-driving circuit produces and drives electric current and provide to organic illuminating element, for driving the luminescence display of organic illuminating element.

Further, at initial phase, the negative electrode low-voltage of organic illuminating element, by the grid of third transistor transmission to driving transistor, controls its conducting;First power supply signal is transmitted to the top crown to the first electric capacity by the 6th transistor.

Further, inputting detection-phase in data, described data signal transmits the bottom crown to the first electric capacity by the first transistor, driving transistor and transistor seconds;First power supply signal transports to the top crown to the first electric capacity by the 6th transistor;Described driving transistor is cut-off when the pressure reduction of its grid and source electrode is equal to its threshold voltage, and when driving transistor cutoff, its threshold voltage is stored on the first electric capacity.

Further, in glow phase, the first power supply signal is by the source electrode of the 4th transistor transmission to driving transistor;First power supply signal transmits the top crown to the first electric capacity by the 4th transistor and the 5th transistor;Driving transistor for determining the size driving electric current, described driving electricity is streamed to organic illuminating element by third transistor.

Compared with prior art, AMOLED pixel-driving circuit advantage provided by the present invention is:

1. the pixel-driving circuit that the present invention provides can eliminate the threshold voltage the driving transistor impact on driving electric current, and the display making OLED is the most even stable;

2. the pixel-driving circuit that the present invention provides is in the case of the type rationally arranging each transistor, it is possible to reduce drives line, makes the driving method of image element circuit, circuit design etc. more convenient;

3. the pixel-driving circuit that the present invention provides is connected second electric capacity between the first electric capacity and the grid of transistor seconds, the grid potential of described driving transistor T0 can be raised in described glow phase D3, reduce the brightness of the described black state of organic illuminating element OLED, improve organic illuminating element OLED display quality;

The transistor being arranged between drive transistor source pole and drain electrode is set to double gate transistor by the pixel-driving circuit that the present invention provides, and effectively reduces the leakage current driving transistor, further increases the reliability of image element circuit.

Accompanying drawing explanation

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 driver' s timing figure 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 driver' s timing 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 driver' s timing figure of the AMOLED pixel-driving circuit of the embodiment of the present invention two.

Detailed description of the invention

The AMOLED pixel-driving circuit proposed the present invention below in conjunction with the drawings and specific embodiments is described in further detail.

Embodiment one

As shown in Figure 2, the present embodiment provides a kind of AMOLED pixel-driving circuit, including: drive transistor T0, the first transistor T1, transistor seconds T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, the first electric capacity C1 and organic illuminating element OLED, wherein, driving transistor T0 for determining the driving electric current of AMOLED pixel-driving circuit, organic illuminating element OLED is used for responding driving electric current and luminescence display.

In the present embodiment, each transistor is low-temperature polycrystalline silicon transistor, and the first transistor is all PMOS to the 5th transistor (T1~T5), driving transistor T0 is PMOS, and the 6th transistor T6 is NMOS tube, and first electrode of the first transistor T1 is connected to data signal Vdata, second electrode connects the source electrode driving transistor T0, grid connects the first driving signal S11, for response the first driving signal S11, by data signal Vdata transmission to primary nodal point n1;Its first electrode of transistor seconds T2 connects the bottom crown of the first electric capacity C1, second electrode connects the drain electrode of described driving transistor T0, bigrid connects two driving signal S12, for response two driving signal S12, controls to drive grid and the break-make of drain electrode of transistor T0;First electrode of third transistor T3 connects the drain electrode of described driving transistor T0, second electrode connects one end of organic illuminating element OLED, grid connects the 3rd driving signal S13, for response the 3rd driving signal S13, the driving electricity of the most self-driven transistor T0 is streamed to organic illuminating element OLED;Second electrode of the 4th transistor T4 connects the first power supply signal PVDD, second electrode of the first electrode and the 5th transistor T5 connects the source electrode of described driving transistor T0 by primary nodal point n1, the grid of the 4th transistor T4 connects fourth drive signal S14, for responding fourth drive signal S14, control the first power supply signal PVDD transmission to the source electrode driving transistor T0;First electrode of described 5th transistor T5 and second electrode of the 6th transistor T6 connect the top crown of described first electric capacity C1 jointly by secondary nodal point n2, grid connects the 5th driving signal S15, for response the 5th driving signal S15, the top crown and control data signal Vdata that control the first power supply signal PVDD transmission to the first electric capacity transmit the top crown to the first electric capacity C1;First electrode of described 6th transistor T6 connects second source signal VREF, and grid connects the 6th and drives signal S16, for response the 6th driving signal S16, controls second source signal VREF and transmits the top crown to the first electric capacity C1.

In the present embodiment, described first drives signal S11, two driving signal S12, the 3rd driving signal S13, fourth drive signal S14, the 5th driving signal S15 and the 6th to drive signal S16 to be provided by six articles of scan lines outside AMOLED pixel-driving circuit respectively.

Fig. 3 is applied to the driving signal timing diagram of the AMOLED pixel-driving circuit of the embodiment of the present invention one shown in Fig. 2, under the driving signal sequence shown in Fig. 3, the driver' s timing of described AMOLED pixel-driving circuit includes: initial phase D1, data input detection-phase D2 and glow phase D3.

First, as shown in Figure 4 A, at initial phase D1, the first driving signal S11 is low level, two driving signal S12 is low level, 3rd driving signal S13 is low level, and fourth drive signal S14 is high level, and the 5th driving signal S15 is high level, 6th driving signal S16 is high level, therefore, the first transistor T1, transistor seconds T2, third transistor T3, the 6th transistor T6 are opened, and the 4th transistor T4, the 5th transistor T5 are turned off.The current potential of the top crown of secondary nodal point n2 namely the first electric capacity C1 is reset by the 6th transistor T6, voltage for second source signal VREF, the current potential of the bottom crown of the 3rd node n3 namely the first electric capacity C1 is reset by transistor seconds T2, equal to the current potential PVEE of one end of the organic illuminating element OLED that third transistor T3 connects.Now, the current potential of the first electric capacity C1 top crown is equal to second source signal VREF, and the current potential of bottom crown is equal to the first power supply signal PVEE, this completes the initialization of described AMOLED pixel-driving circuit.

Secondly, as shown in Figure 4 B, detection-phase D2 is inputted in data, first driving signal S11 is low level, two driving signal S12 is low level, 3rd driving signal S13 is high level, fourth drive signal S14 is high level, 5th driving signal S15 is high level, 6th driving signal S16 is high level, therefore, the first transistor T1, transistor seconds T2, 6th transistor T6 is opened, third transistor T3, 4th transistor T4, 5th transistor T5 is turned off, now because driving the low-voltage that source electrode i.e. node n3 is second source signal VREF of transistor T0, so driving transistor T0 to be also at opening.The current potential of primary nodal point n1 is equal to data signal Vdata being currently entered, transistor seconds T2 is opened, cause grid and the drain electrode short circuit driving transistor T0, the grid potential driving transistor T0 is drawn high by data signal Vdata gradually, according to the electrology characteristic driving transistor itself, when the current potential that the grid voltage driving transistor T0 is pulled to its grid is difference (i.e. the Vdata-Vth) deducting its threshold voltage vt h equal to the electricity of source electrode, drive transistor T0 cut-off;Owing to the first transistor T1 is opened, the source electrode driving transistor T0 is connected to data signal Vdata, so driving transistor T0 when cut-off, the current potential (current potential of the i.e. the 3rd node n3) of its grid deducts the threshold voltage vt h driving transistor T0 equal to the source electrode (i.e. the current potential of primary nodal point n1) driving transistor T0, the current potential Vn30 driving the grid of transistor T0 is represented by equation 2, it may be assumed that

[equation 2] Vn30=Vdata-Vth

Owing to the 6th transistor T6 is opened, second source signal VREF is applied to the first electric capacity C1 top crown, the input equal to second source signal VREF of the current potential (i.e. the current potential of secondary nodal point n2) of the first electric capacity C1 top crown, it may be assumed that

[equation 3] Vn20=VREF

Then, as shown in Figure 4 C, in glow phase D3, the first driving signal S11 is high level, and two driving signal S12 is high level, 3rd driving signal S13 is low level, fourth drive signal S14 is low level, and the 5th driving signal S15 is low level, and the 6th driving signal S16 is low level, therefore third transistor T3, the 4th transistor T4, the 5th transistor T5 are opened, and the first transistor T1, transistor seconds T2, the 6th transistor T6 are turned off.The current potential of secondary nodal point n2 resets to the first power supply signal PVDD by the 4th transistor T4 and the 5th transistor T5, it may be assumed that

[equation 4] Vn2=PVDD

Owing on the first electric capacity C1, voltage difference VC=Vn30-Vn20 between bottom crown is constant, so when the current potential of secondary nodal point n2 is become Vn2=PVDD by Vn20=VREF saltus step, the current potential of the current potential of the 3rd node n3 namely the grid of driving transistor T0 is Vn3 by the corresponding saltus step of Vn30, and the equation 5 that Vn3 can be drawn by equation [2], equation [3] and equation [4] represents:

[equation 5] Vn3=Vn2+VC=PVDD+Vdata-Vth-VREF

And now, owing to the 4th transistor T4 is opened, the first power supply signal PVDD is applied to drive the source electrode of transistor T0 by the 4th transistor T4 and primary nodal point n1, drive the gate source voltage Vgs of transistor T0 can be represented by equation 6, it may be assumed that

[equation 6] Vgs=Vn1-Vn3=PVDD-(PVDD+Vdata-Vth-VREF)

=VREF-Vdata+Vth

In glow phase D3, as shown in Figure 4 C, third transistor T3 is opened, and now drives transistor T0 to be also on, and would correspond to drive the driving electric current I of the gate source voltage Vgs of transistor T0OLEDIt is fed to organic illuminating element OLED, causes organic illuminating element OLED luminous, drive the driving electric current I that transistor T0 producesOLEDRepresented by equation 7, it may be assumed that

[equation 7] IOLED=k (Vgs-Vth)2=k (VREF-Vdata+Vth-Vth)2=k (VREF-Vdata)2

In this equation, IOLEDRepresent the electric current flowing through organic illuminating element OLED, Vgs represents the gate source voltage driving transistor T0, and Vth represents the threshold voltage driving transistor T0, and Vdata represents data signal (also can claim data voltage), VREF represents the input voltage of second source signal, and k represents constant.From equation 7 it can be seen that because do not consider drive transistor T0 threshold voltage, but based on data signal Vdata and second source signal VREF determine driving electric current IOLED, so organic illuminating element OLED luminescence and display can be stably driven with.

In other embodiments, described the first transistor can also is that other kinds of transistor to the 6th transistor, however it is not limited to this specific embodiment;Described the first transistor is controlled to the 6th transistor respectively by external signal S11 to S16, described external signal S11 to S16 is provided by 6 scan lines outside AMOLED pixel-driving circuit respectively, described external signal S11 to S16 can also coordinate the driver' s timing of external circuit, i.e. initial phase D1, data input detection-phase D2 and can have interval between tri-time periods of glow phase D3.

Preferably, transistor seconds T2 is double gate transistor in the present embodiment.The effect of transistor seconds T2 is the break-make controlling to drive the electric current between the grid of transistor T0 and drain electrode, and generally, transistor still has 10 in the case of grid applies low-voltage-12~10-13The leakage current of V, in order to avoid driving the leakage current impact on circuit of transistor T0, is set to double gate transistor by transistor seconds T2, can effectively reduce leakage current, improve the reliability of image element circuit further.

Preferably, the second electric capacity C2 is also included in the AMOLED pixel-driving circuit of the present embodiment, its top crown is connected the bottom crown of described first electric capacity C1 jointly with the grid of described driving transistor T0, its bottom crown connects the grid of transistor seconds T2, for raising the grid potential of described driving transistor T0 in described glow phase D3, reduce the brightness of the black state of organic illuminating element OLED, improve organic illuminating element OLED display quality.Specifically refer to Fig. 2, when the signal of two driving signal S12 rises to high potential from electronegative potential, the current potential of fourth node n4 is raised, according to principle of charge conservation, the voltage difference at the second electric capacity C2 two ends to keep consistent, therefore the 3rd node n3 current potential is raised the most accordingly and is i.e. driven the grid potential of transistor T0 also to improve, if the current potential of the 3rd node n3 improves Δ V, the grid that can make driving transistor T0 is slightly higher in the last luminous stage, can reduce the brightness (Vdata=5V during black state) of black state, equation below represents:

Ioled

=k (PVDD-(Vdata-| Vth |+PVDD-Vreff)-| Vth |+Δ V)2

=k (Vreff-Data+ Δ V)2

Embodiment two

As shown in Figure 5, the present embodiment provides a kind of AMOLED pixel-driving circuit, including: drive transistor T0, the first transistor T1, transistor seconds T2, third transistor T3, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6, the first electric capacity C1 and organic illuminating element OLED, wherein, driving transistor T0 for determining the driving electric current of AMOLED pixel-driving circuit, organic illuminating element OLED is used for responding driving electric current and luminescence display.

In the present embodiment, each transistor is low-temperature polycrystalline silicon transistor, and the 4th transistor T4 and the 5th transistor T5 is NMOS tube, and driving transistor T0, the first transistor T1, transistor seconds T2, third transistor T3 and the 6th transistor T6 is PMOS.First electrode of the first transistor T1 is connected to data signal Vdata, and the second electrode connects the source electrode driving transistor T0, and grid connects two driving signal S32, for response two driving signal S32, by data signal Vdata transmission to primary nodal point n1;Transistor seconds T2 is double gate transistor, its first electrode connects the bottom crown of the first electric capacity C1, and the second electrode connects the drain electrode of described driving transistor T0, and bigrid connects two driving signal S32, for responding two driving signal S32, control to drive grid and the break-make of drain electrode of transistor T0;First electrode of third transistor T3 connects the drain electrode of described driving transistor T0, second electrode connects one end of organic illuminating element OLED, grid connects the first driving signal S21, and for response the first driving signal S21, the most self-driven electricity is streamed to organic illuminating element OLED;Second electrode of the 4th transistor T4 connects the first power supply signal PVDD, second electrode of the second electrode and the 5th transistor T5 connects the source electrode of described driving transistor T0 by primary nodal point n1, grid connects two driving signal S32, for responding two driving signal S32, control the first power supply signal PVDD transmission to the source electrode driving transistor T0;First electrode of described 5th transistor T5 and second electrode of the 6th transistor T6 connect the top crown of described first electric capacity C1 jointly by secondary nodal point n2, grid connects two driving signal S32, for responding two driving signal S32, the top crown and control data signal Vdata that control the first power supply signal PVDD transmission to the first electric capacity transmit the top crown to the first electric capacity C1;First electrode of described 6th transistor T6 connects second source signal VREF, and grid connects two driving signal S32, for response two driving signal S32, controls second source signal VREF and transmits the top crown to the first electric capacity C1.

In the present embodiment, described first drives signal S21 and two driving signal S32 to be provided by two articles of scan lines outside AMOLED pixel-driving circuit respectively.

Fig. 6 is applied to the driving signal timing diagram of the AMOLED pixel-driving circuit of the embodiment of the present invention four shown in Fig. 5, under the driving signal sequence shown in Fig. 5, the driver' s timing of described AMOLED pixel-driving circuit includes: initial phase D1, data input detection-phase D2 and glow phase D3.

The present embodiment is different from the type differing only in transistor of embodiment one and to control the driving signal of each transistor different, 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, in glow phase D3, third transistor T3 is opened, and would correspond to drive the driving electric current I of the gate source voltage Vgs of transistor T0OLEDIt is fed to organic illuminating element OLED, causes organic illuminating element OLED luminous, drive the driving electric current I that transistor T0 producesOLED=k (Vgs-Vth)2=k (VREF-Vdata)2, wherein, IOLEDRepresent the electric current flowing through organic illuminating element OLED, Vgs represents the gate source voltage driving transistor T0, and Vth represents the threshold voltage driving transistor T0, and Vdata represents data signal (also can claim data voltage), VREF represents the input voltage of second source signal, and k represents constant.It can thus be seen that the present embodiment does not the most consider to drive the threshold voltage of transistor T0, but determine driving electric current I based on data signal Vdata and second source signal VREFOLED, so organic illuminating element OLED luminescence and display can be stably driven with.

The AMOLED pixel-driving circuit that this enforcement provides is by arranging the type of each transistor, it is made to use the fewest driving signal, make the driving method of pixel-driving circuit, circuit design etc. more convenient, but the present invention is not limited to the restriction of embodiments above, those skilled in the art can also pass through additive method on the basis of giving the disclosure of invention, each transistor types and the type of drive of pixel-driving circuit are rationally set, reduce the driving signal of pixel-driving circuit, reach to simplify the purpose of circuit.

In sum, AMOLED pixel-driving circuit provided by the present invention, by the switch of the first to the 6th transistor and the access of first, second power supply signal and disconnection, make transmission only relevant with data signal and second source signal to the driving size of current of organic illuminating element, and then achieve the threshold voltage compensation driving transistor, improve uniformity of luminance and the display quality of OLED.

Claims (14)

1. an AMOLED pixel-driving circuit, it is characterised in that including:
The first transistor, its first electrode is connected to data signal, and the second electrode connects the source electrode of a driving transistor;
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 transistor;
Third transistor, its first electrode connects the drain electrode of described driving transistor, and the second electrode connects an organic illuminating element;
4th transistor, second electrode of its first electrode and the 5th transistor connects the source electrode of described driving transistor jointly, described first electrode of the 5th transistor and the second electrode of the 6th transistor connect the top crown of described first electric capacity jointly, second electrode of described 4th transistor connects the first power supply signal, and the first electrode of described 6th transistor connects second source signal.
2. AMOLED pixel-driving circuit as claimed in claim 1, it is characterised in that:
Drive transistor for determining the driving electric current of AMOLED pixel-driving circuit;
4th transistor is for controlling the first power supply signal transmission to the source electrode driving transistor;
Third transistor is streamed to organic illuminating element for the driving electricity of self-driven transistor in the future;
Organic illuminating element is used for responding driving electric current and luminescence display;
6th transistor transmits the top crown to the first electric capacity for controlling second source signal;
5th transistor is for controlling the top crown of the first power supply signal transmission to the first electric capacity and controlling data signal transmission to the top crown of the first electric capacity;
The first transistor is for controlling the transmission of data signal;
Transistor seconds is for controlling to drive grid and the break-make of drain electrode of transistor.
3. AMOLED pixel-driving circuit as claimed in claim 1, it is characterised in that: described transistor seconds is single gridistor or double gate transistor.
4. AMOLED pixel-driving circuit as claimed in claim 1, it is characterised in that the first transistor is PMOS to the 5th transistor, and driving transistor is PMOS, and the 6th transistor is NMOS tube.
5. AMOLED pixel-driving circuit as claimed in claim 4, it is characterised in that described the first transistor to the 6th transistor is controlled by six external drive signals respectively.
6. AMOLED pixel-driving circuit as claimed in claim 5, it is characterised in that described six external drive signals are provided by six scan lines outside AMOLED pixel-driving circuit respectively.
7. AMOLED pixel-driving circuit as claimed in claim 1, it is characterised in that the 4th transistor and the 5th transistor are NMOS tube, driving transistor, the first transistor, transistor seconds, third transistor and the 6th transistor is PMOS.
8. AMOLED pixel-driving circuit as claimed in claim 7, it is characterized in that, the grid of described third transistor connects the first driving signal, and the grid of described the first transistor, transistor seconds, the 4th transistor, the 5th transistor and the 6th transistor is all connected with two driving signal.
9. AMOLED pixel-driving circuit as claimed in claim 1, it is characterised in that described each transistor is low-temperature polycrystalline silicon transistor.
10. AMOLED pixel-driving circuit as claimed in claim 1, it is characterized in that, also include the second electric capacity, its top crown is connected the bottom crown of described first electric capacity jointly with the grid of described driving transistor, its bottom crown connects the grid of transistor seconds, for raising the grid potential of described driving transistor in glow phase, reduce the brightness of the black state of described organic illuminating element.
The 11. AMOLED pixel-driving circuits as according to any one of claim 1 to 10, it is characterised in that the driver' s timing of described AMOLED pixel-driving circuit includes:
Initial phase, initializes described AMOLED pixel-driving circuit;
Data input detection-phase, detects and drives the threshold voltage of transistor and store to described first electric capacity;
Glow phase, AMOLED pixel-driving circuit produces and drives electric current and provide to organic illuminating element, for driving the luminescence display of organic illuminating element.
12. AMOLED pixel-driving circuits as claimed in claim 11, it is characterised in that at initial phase, the negative electrode low-voltage of organic illuminating element, by the grid of third transistor transmission to driving transistor, controls its conducting;First power supply signal is by the top crown of the 6th transistor transmission to the first electric capacity.
13. AMOLED pixel-driving circuits as claimed in claim 11, it is characterised in that input detection-phase in data, described data signal transmits the bottom crown to the first electric capacity by the first transistor, driving transistor and transistor seconds;First power supply signal transports to the top crown of the first electric capacity by the 6th transistor;Described driving transistor is cut-off when the pressure reduction of its grid and source electrode is equal to its threshold voltage.
14. AMOLED pixel-driving circuits as claimed in claim 11, it is characterised in that in glow phase, the first power supply signal is by the source electrode of the 4th transistor transmission to driving transistor;First power supply signal transmits the top crown to the first electric capacity by the 4th transistor and the 5th transistor;Driving transistor for determining the size driving electric current, described driving electricity is streamed to organic illuminating element by third transistor.
CN201110372156.9A 2011-11-21 2011-11-21 AMOLED pixel-driving circuit CN103123773B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110372156.9A CN103123773B (en) 2011-11-21 2011-11-21 AMOLED pixel-driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110372156.9A CN103123773B (en) 2011-11-21 2011-11-21 AMOLED pixel-driving circuit

Publications (2)

Publication Number Publication Date
CN103123773A CN103123773A (en) 2013-05-29
CN103123773B true CN103123773B (en) 2016-08-03

Family

ID=48454735

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110372156.9A CN103123773B (en) 2011-11-21 2011-11-21 AMOLED pixel-driving circuit

Country Status (1)

Country Link
CN (1) CN103123773B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103943060B (en) * 2013-06-28 2016-03-16 上海天马微电子有限公司 The driving method of organic light emitting display and image element circuit thereof, image element circuit
CN104576744A (en) * 2013-10-24 2015-04-29 中国科学院苏州纳米技术与纳米仿生研究所 Carbon nanotube thin-film transistor, AMOLED (active matrix organic light emitting diode) pixel flexible driving circuit and manufacturing method thereof
TWI512740B (en) * 2014-05-07 2015-12-11 Au Optronics Corp Shift register apparatus and voltage regulating device thereof
CN104021764B (en) 2014-06-18 2016-06-29 上海和辉光电有限公司 A kind of luminous signal control circuit
CN104658482B (en) * 2015-03-16 2017-05-31 深圳市华星光电技术有限公司 AMOLED pixel-driving circuits and image element driving method
CN104732927B (en) * 2015-04-09 2017-10-03 京东方科技集团股份有限公司 A kind of image element circuit and its driving method and display device
CN104978931B (en) 2015-07-09 2017-11-21 上海天马有机发光显示技术有限公司 Load device and method, display panel, the display of data voltage signal
CN105405397A (en) * 2015-10-14 2016-03-16 上海天马有机发光显示技术有限公司 Pixel circuit and driving method thereof, and organic light-emitting display apparatus
CN105469741B (en) * 2016-02-03 2018-03-02 上海天马微电子有限公司 A kind of image element circuit, driving method and display device
CN105654901B (en) 2016-03-15 2018-05-25 深圳市华星光电技术有限公司 The compensation circuit of liquid crystal display device and its Organic Light Emitting Diode
CN105702210B (en) * 2016-04-25 2018-03-27 上海天马微电子有限公司 Organic light emissive pixels drive circuit and its driving method
CN106128360B (en) * 2016-09-08 2018-11-13 京东方科技集团股份有限公司 Pixel circuit, display panel, display equipment and driving method
CN106875893B (en) 2017-03-07 2019-03-15 京东方科技集团股份有限公司 Pixel circuit and display device with the pixel circuit
CN110111741B (en) * 2019-04-18 2020-09-01 深圳市华星光电半导体显示技术有限公司 Pixel driving circuit and display panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101739947A (en) * 2008-11-26 2010-06-16 三星移动显示器株式会社 Organic light emitting display device and method of driving the same
CN101866614A (en) * 2009-04-17 2010-10-20 三星移动显示器株式会社 The organic light-emitting display device of pixel and this pixel of use
CN101908316A (en) * 2009-06-05 2010-12-08 三星移动显示器株式会社 Pixel and organic light emitting display using the same
CN102144252A (en) * 2009-11-19 2011-08-03 松下电器产业株式会社 Display panel device, display device and method for controlling same
CN102194405A (en) * 2010-03-17 2011-09-21 三星移动显示器株式会社 Pixel and organic light emitting display device using the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2518276A1 (en) * 2005-09-13 2007-03-13 Ignis Innovation Inc. Compensation technique for luminance degradation in electro-luminance devices
KR20070111638A (en) * 2006-05-18 2007-11-22 엘지.필립스 엘시디 주식회사 Pixel circuit of organic light emitting display
KR20100009219A (en) * 2008-07-18 2010-01-27 삼성모바일디스플레이주식회사 Pixel and organic light emitting display device using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101739947A (en) * 2008-11-26 2010-06-16 三星移动显示器株式会社 Organic light emitting display device and method of driving the same
CN101866614A (en) * 2009-04-17 2010-10-20 三星移动显示器株式会社 The organic light-emitting display device of pixel and this pixel of use
CN101908316A (en) * 2009-06-05 2010-12-08 三星移动显示器株式会社 Pixel and organic light emitting display using the same
CN102144252A (en) * 2009-11-19 2011-08-03 松下电器产业株式会社 Display panel device, display device and method for controlling same
CN102194405A (en) * 2010-03-17 2011-09-21 三星移动显示器株式会社 Pixel and organic light emitting display device using the same

Also Published As

Publication number Publication date
CN103123773A (en) 2013-05-29

Similar Documents

Publication Publication Date Title
TWI618046B (en) Pixel
CN106558287B (en) Organic light emissive pixels driving circuit, driving method and organic light emitting display panel
CN103886831B (en) Oganic light-emitting display device and the method being used for driving this equipment
US10032838B2 (en) AMOLED pixel driving circuit and pixel driving method
CN104050916B (en) The pixel compensation circuit of a kind of OLED and method
CN103077680B (en) A kind of OLED pixel-driving circuit
CN103971640B (en) A kind of pixel-driving circuit and driving method thereof and display device
US9514686B2 (en) Organic light emitting display device
CN107358915B (en) Pixel circuit, driving method thereof, display panel and display device
JP5611312B2 (en) Organic light emitting diode display device and driving method thereof
CN103778889B (en) Organic light emitting diode circuit and driving method thereof
KR101401606B1 (en) Pixel unit circuit, pixel array, panel and method for driving panel
CN103871362B (en) Oled
CN106205490B (en) Organic light emitting display
CN104465715B (en) Image element circuit, driving method, display panel and display device
KR101859474B1 (en) Pixel circuit of organic light emitting diode display device
CN104409047B (en) Pixel driving circuit, pixel driving method and display device
US9728138B2 (en) Organic light emitting display device and method of driving the same
KR101015339B1 (en) Pixel and Organic Light Emitting Display Using The Pixel
JP5198374B2 (en) Signal drive device
US9390652B2 (en) Organic light emitting display device and driving method thereof
DE102016211533A1 (en) Organic light emitting diode driver circuit, display panel and display device
US8159421B2 (en) Organic light emitting diode display
CN104485071B (en) Image element circuit and its driving method and active matrix/organic light emitting display
KR101152580B1 (en) Pixel and Organic Light Emitting Display Device Using the Same

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model