CN102346999A - AMOLED (Active Matrix/Organic Light-Emitting Diode) pixel circuit and driving method thereof - Google Patents
AMOLED (Active Matrix/Organic Light-Emitting Diode) pixel circuit and driving method thereof Download PDFInfo
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Abstract
The invention discloses an AMOLED (Active Matrix/Organic Light-Emitting Diode) pixel circuit and a driving method thereof. The AMOLED pixel circuit comprises pixel units which are distributed in an n-row, m-column matrix, the pixel units are connected with a data driver through data lines and a scanning driver through scanning lines, each pixel unit comprises an organic light-emitting diode (OLED), and n and m are natural numbers; each row pixel unit comprises a first scanning control line Sn1, a second scanning control line Sn2 and a third scanning control line Sn3; the OLED is connected between the drain of a sixth transistor T6 and a second power supply ELVSS; and each row pixel unit also comprises threshold voltage compensation transistors T4 and T8 and leakage current compensation transistors T1 and T7. By arranging the threshold voltage compensation transistors and the leakage current compensation transistors, the response characteristic of the active matrix OLED is improved, and thereby images with uniform image quality can be displayed.
Description
Technical field
The present invention relates to a kind of image element circuit and driving method thereof, relate in particular to a kind of AMOLED image element circuit and driving method thereof.
Background technology
In recent years, developed and compared various types of panel display apparatus that cathode-ray tube (CRT) is in light weight and volume is little.
In various types of panel display apparatus; Because active array organic light emitting display device uses self luminous Organic Light Emitting Diode (OLED) to come display image; Usually has the response time weak point; Use low-power consumption to drive, the characteristic of better relatively brightness and colour purity is so organic light-emitting display device has become the focus of display device of future generation.Organic Light Emitting Diode can use passive-matrix (PM) to drive, and also can use active matrix drive (AM).Compare PM and drive, the information capacity that the AM driving has demonstration is bigger, and power consumption is lower, and device lifetime is long, the picture contrast advantages of higher, and the PM driving is applicable to cheaply, simple display device.
For large-scale active array organic light emitting display device, comprise a plurality of pixels of the intersection region that is positioned at sweep trace and data line.Each pixel comprises Organic Light Emitting Diode and the image element circuit that is used to drive said Organic Light Emitting Diode.Image element circuit generally includes switching transistor, driving transistors and holding capacitor.
The characteristic of the pixel of active matrix organic light-emitting diode is activated the influence of unfavorable factor of the leakage current of difference and switching transistor between the transistor, and is therefore relatively poor through the quality uniformity and the consistance of so a plurality of pixel images displayed.
Fig. 1 is the circuit diagram of the conventional pixel of active array organic light emitting display device.Among Fig. 1, the transistor that comprises in the image element circuit 112 is the PMOS transistor.
Referring to Fig. 1, the conventional pixel of active matrix organic light-emitting diode display device includes OLED OLED, has been connected to data line Dm and scan control line Sn with the enter the palace a second time image element circuit 112 of OLED of control organic light emission.
The anode of organic diode OLED is connected to image element circuit 112, and the negative electrode of Organic Light Emitting Diode OLED is connected to second source ELVSS.Organic Light Emitting Diode OLED sends the light with the corresponding brightness of the electric current that provided with image element circuit 112.
When scan control line Sn provides sweep signal, image element circuit 112 is controlled the magnitude of current of supplying with Organic Light Emitting Diode OLED corresponding to the data-signal of supplying with data line Dm.For this reason; Image element circuit 112 comprises between the transistor seconds T2 (being driving transistors) that is connected between the first power supply ELVDD and the Organic Light Emitting Diode OLED anode, the grid that is connected transistor seconds T2 and the data line Dm the first transistor T1 (being switching transistor) and is connected the grid of transistor seconds T2 and the first capacitor C1 between the first power supply ELVDD that wherein the grid of the first transistor T1 is connected to scan control line Sn.
The grid of the first transistor T1 is connected to scan control line Sn, and the source electrode of the first transistor T1 (or drain electrode) is connected to data line Dm.The drain electrode of the first transistor T1 (or source electrode) is connected to the terminal of the first capacitor C1.When from scan control line Sn when the first transistor T1 provides scan control signal, the first transistor T1 conducting, and be supplied to the first capacitor C1 from the data-signal of data line Dm supply.At this moment, corresponding with data-signal voltage is stored the first capacitor C1.
The grid of transistor seconds T2 is connected to the terminal of the first capacitor C1, and the source electrode of transistor seconds T2 is connected to the first power supply ELVDD.The drain electrode of transistor seconds T2 is connected to the anode of Organic Light Emitting Diode OLED.Transistor seconds T2 is to controlling through the electric current that Organic Light Emitting Diode OLED flows to second source ELVSS from the first power supply ELVDD, and this electric current is corresponding to the voltage that is stored among the first capacitor C1.
The terminal of the first capacitor C1 is connected to the grid of transistor seconds T2, and another terminal of the first capacitor C1 is connected to the first power supply ELVDD.The voltage corresponding with data-signal is filled into the first capacitor C1.
Conventional pixel shows the image with predetermined luminance through controlling the brightness of Organic Light Emitting Diode corresponding to the voltage that is charged among the first capacitor C1 to Organic Light Emitting Diode OLED supply of current, and is as shown in Figure 1.Yet in this traditional active matrix organic LED display device, because the threshold voltage variation of transistor seconds T2 and the leakage current of the first transistor T1, very difficult demonstration has image of uniform luminescence.
For example in different pixels because the difference of the threshold voltage of transistor seconds T2; Make that the electric current that when adding identical gate drive voltage, flows through Organic Light Emitting Diode OLED is inconsistent; Inconsistent according to the brightness that becomes Organic Light Emitting Diode OLED; The same data-signal of each pixel response produces the light with different brightness, thereby being difficult to show has image of uniform luminescence.
For another example because the leakage current of the first transistor T1 causes the grid voltage of transistor seconds T2 to change; Cause the electric current that flows through Organic Light Emitting Diode OLED to change; The brightness of the Organic Light Emitting Diode OLED that causes changes during the fluorescent lifetime section, and causes that image quality worsens.
Summary of the invention
Technical matters to be solved by this invention provides a kind of AMOLED image element circuit and driving method thereof, improves the response characteristic of active matrix organic light-emitting diode, shows the image with uniform image quality.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of AMOLED image element circuit; Comprise and be the pixel cell that the capable m column matrix of n distributes; Said pixel cell links to each other with data driver through data line; Link to each other with scanner driver through sweep trace, each pixel cell includes OLED OLED, and n, m are natural number; Wherein:
Every capable pixel cell comprises the first scan control line Sn1, the second scan control line Sn2 and the 3rd scan control line Sn2; Said Organic Light Emitting Diode OLED is connected between 6 drain electrodes of the 6th transistor T and the second source ELVSS; Every capable pixel cell also comprises:
The first transistor T1 is connected between Section Point N2 and the 7th transistor T 7 source electrodes, and its grid connects the 3rd scan control line Sn3; Transistor seconds T2 is connected between the drain electrode of data line Dm and the 3rd transistor T 3, and its grid is connected to the second scan control line Sn2; The 3rd transistor T 3 is connected between first node N1 and the 6th transistor T 6 source electrodes, and its grid is received Section Point N2; The first capacitor C1 is connected between the Section Point N2 and the first power supply ELVDD;
The 4th transistor T 4 is connected between the source electrode of grid and the 8th transistor T 8 of the 3rd transistor T 3, and its grid is connected to the second scan control line Sn2; The 5th transistor T 5 is connected between the first power supply ELVDD and the first node N1, and its grid is connected to the first scan control line Sn1; The 6th transistor T 6 is connected between 3 drain electrodes of the 3rd transistor T and the Organic Light Emitting Diode OLED anode, and its grid is connected to the first scan control line Sn1; The 7th transistor T 7 is connected between the first transistor T1 drain electrode and the 3rd power supply ELVL, and its grid is connected to the 3rd scan control line Sn3; The 8th transistor T 8 is connected between 4 drain electrodes of the 4th transistor T and the first node N1, and its grid is connected to the second scan control line Sn2;
Said the 3rd power supply ELVL is produced by the external drive circuit real-time regulated, and the absolute value of the voltage difference of said the 3rd power supply ELVL and Section Point N2 equals the absolute value of the voltage difference of the Section Point N2 and the first power supply ELVDD.
The present invention also provides a kind of above-mentioned AMOLED image element circuit driving method for solving the problems of the technologies described above, and wherein, said method comprises the steps:
The line-scanning period of every capable pixel is divided into very first time section t1, second time period t 2 and the 3rd time period t 3;
At first, during very first time section t1, scanner driver output low level control signal to the three scan control line Sn3 open the first transistor T1 and the 7th transistor T 7, and the current potential with Section Point N2 in each frame resets to the 3rd power supply ELVL;
Thereafter, during second time period t 2 of time period that is set to programme, scanner driver output low level control signal is opened transistor seconds T2, the 8th transistor T 8 and the 4th transistor T 4 to the second scan control line Sn2; Because Section Point N2 is initialised during very first time section t1; So the 3rd transistor T 3 conductings; To first capacitor C1 charging, the magnitude of voltage when final charging finishes is from the difference between the threshold voltage of the data-signal Vdata of data line Dm and the 3rd transistor T 3;
At last; During the 3rd time period t 3; Scanner driver output low level control signal is to the first scan control line Sn1; Open the 5th transistor T 5 and the 6th transistor T 6, drive current flows to second source ELVSS, the normal luminous display image of current line pixel along the first power supply ELVDD through the path of the 5th transistor T 5, the 3rd transistor T 3, the 6th transistor T 6 and Organic Light Emitting Diode OLED.
The present invention contrasts prior art has following beneficial effect: AMOLED image element circuit provided by the invention and driving method thereof; Have threshold voltage compensation transistor and leakage compensated transistor through setting; Thereby improve the response characteristic of active matrix organic light-emitting diode, show image with uniform image quality.
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Description of drawings
Fig. 1 is existing active matrix organic light-emitting diode pixel equivalent circuit figure;
Fig. 2 is an active array organic light emitting display device structural representation of the present invention;
Fig. 3 is the pixel equivalent circuit figure of active array organic light emitting display device of the present invention;
Fig. 4 is the pixel drive signal oscillogram of active array organic light emitting display device of the present invention.
Among the figure:
10 display units, 20 scanner drivers, 30 data drivers
101 pixels
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description.
Fig. 2 is an active array organic light emitting display device structural representation of the present invention.
See also Fig. 2, active array organic light emitting display device of the present invention comprises: display unit 10, scanner driver 20 and data driver 30; Said display unit 10 comprises a plurality of pixels 101, and said a plurality of pixels 101 are with the intersection region of matrix arrangement at scan control line Sn1, Sn2 and Sn3 and data line D1 to Dm.
Each pixel 101 is connected to scan control line (for example, Sn1, Sn2 and Sn3) and data line (said data line is connected to the row pixel 101 that pixel 101 itself belongs to).For example, will be positioned at i pixels 101 capable and the j row and be connected to i scan control line Si1, Si2 and Si3 and j data line Dj, i, j are natural number.
Each pixel 101 is initialised during the very first time section of scan control signal is provided at the scan control line, and second time period of the scan control signal that provides at the scan control line of pixel 101 is accepted the data-signal that provides from data line.Pixel 101 has with the corresponding brightness light of data-signal through emission and comes display image during the 3rd time period; During said the 3rd time period; After the scan control signal that the scan control line provides, transit to suitable level, thereby electric current is provided to the Organic Light Emitting Diode that in each pixel 101, is provided with.
Simultaneously, display unit 10 receive from outside (for example) from power supply provide from the first power supply ELVDD, second source ELVSS and the 3rd power supply ELVL.The first power supply ELVDD and second source ELVSS are used separately as high level voltage source and low level voltage source.The first power supply ELVDD and second source ELVSS are as the driving power of pixel 101.The 3rd power supply ELVL is used for replenishing the 3rd transistor gate because the variation of the voltage that leakage current causes.
Scanner driver 20 results from the corresponding scan control signal of scan control signal that the outside provides (for example, providing from timing control unit).To sequentially offer pixel 101 through scan control line S1 to Sn respectively by the scan control signal that scanning monitor 20 produces.
Data driver 30 generations and outside provide the data and the corresponding data-signal of data controlling signal of (for example, providing from timing control unit).To synchronously offer pixel 101 through data line D1 to Dm with sweep signal by the data-signal that data driver 30 produces.
Fig. 3 is the pixel equivalent circuit figure of active array organic light emitting display device of the present invention.
Please continue with reference to Fig. 3, the pixel 101 of the embodiment of the invention comprises: Organic Light Emitting Diode OLED is connected between the first power supply ELVDD and the second source ELVSS; The first transistor T1 and the 7th transistor T 7, during scan control signal offered the scan control line Sn3 time period, said the first transistor T1 and the 7th transistor T 7 offered Section Point N2 with the 3rd supply voltage ELVL; Pixel-driving circuit is connected between the first power supply ELVDD and the Organic Light Emitting Diode, is used for to Organic Light Emitting Diode OLED drive current being provided.
During scan control signal is offered the time period of scan control line Sn3, the first transistor T1 and 7 conductings of the 7th transistor T, thus the voltage of the 3rd power supply ELVL is offered Section Point N2.
That is, the first transistor T1 and the 7th transistor T 7 provide constant voltage to Section Point N2 during the initialization time of pixel 101 section.Among the embodiment of the demonstration in Fig. 3, resetting voltage is set to the 3rd power supply ELVL.
Transistor seconds T2 is connected between the drain electrode of data line Dm and the 3rd transistor T 3, and the grid of transistor seconds T2 is connected to scan control line Sn2.In the time period that scan control signal is offered scan control line Sn2, transistor seconds T2 conducting, thus will offer pixel 101 from the data-signal that data line Dm provides.
The 3rd transistor T 3 is connected between first node N1 and the 6th transistor T 6, and the grid of the 3rd transistor T 3 is connected to Section Point N2.The control of the 3rd transistor T 3 flows to the amplitude of the drive current of Organic Light Emitting Diode OLED accordingly during the fluorescent lifetime section of pixel 101 from the data-signal that provides with transistor seconds T2.
The 4th transistor T 4 is connected between the source electrode and Section Point N2 of the 8th transistor T 8, and the grid of the 4th transistor T 4 is connected to scan control line Sn2.During scan control signal is offered the time period of scan control line Sn2, the 4th transistor T 4 and the 8 common conductings of the 8th transistor T, thus the source electrode of the 3rd transistor T 3 is connected with Section Point N2.
The 5th transistor T 5 is connected between the first power supply ELVDD and the first node N1, and the grid of the 5th transistor T 5 is connected to scan control line Sn1.When the scan control signal that provides from the scan control line transits to low level, 5 conductings of the 5th transistor T, then the source electrode of the 3rd transistor T 3 is connected to the first power supply ELVDD.
The 6th transistor T 6 is connected between the 3rd transistor T 3 and the Organic Light Emitting Diode OLED.The grid of the 6th transistor T 6 connects scan control line Sn1.In the time period that the high level scan control signal is offered scan control line Sn1, the 6th transistor T 6 ends, thereby can prevent that drive current is provided for Organic Light Emitting Diode OLED.During scan control signal transits to low level fluorescent lifetime section, 6 conductings of the 6th transistor T, thus the 3rd transistor is connected to Organic Light Emitting Diode OLED, and the 3rd transistor T 3 offers the Organic Light Emitting Diode drive current.
The 7th transistor T 7 provides constant voltage through the first transistor T1 to Section Point N2 during the initialization time of pixel 101 section.The 7th transistor T 7 is connected between the first transistor T1 and the 3rd power supply ELVL; The grid of the 7th transistor T 7 is connected to the 3rd scan control signal Sn3; When the scan control signal that provides from scan control line Sn3 transits to low level, 7 conductings of the 7th transistor T, the first transistor T1 is connected to the 3rd power supply ELVL; Among the embodiment of the demonstration in Fig. 3, resetting voltage is set to the 3rd power supply ELVL.
The 8th transistor T 8 is connected between the drain electrode and first node N1 of the 4th transistor T 4, and the grid of the 8th transistor T 8 is connected to scan control line Sn2.During scan control signal being offered the scan control line Sn2 time period, the 4th transistor T 4 and the 8 common conductings of the 8th transistor T, thus the source electrode of the 3rd transistor T 3 is connected with Section Point N2.
The first capacitor C1 is connected between the Section Point N2 and the first power supply ELVDD.During scan control signal being offered the scan control line Sn3 time period, provide the 3rd supply voltage ELVL to come the initialization first capacitor C1 through the first transistor T1 and the 7th transistor T 7.Thereafter, during scan control signal being offered the scan control line S2 time period, will with through transistor seconds T2, the data-signal correspondent voltage that the 3rd transistor T 3, the eight transistor Ts 8 and the 4th transistor T 4 provide is stored among the first capacitor C1.
Organic Light Emitting Diode OLED is connected between image element circuit 112 and the second source ELVSS.During the fluorescent lifetime section of pixel 101, Organic Light Emitting Diode OLED will launch and the corresponding light of drive current that provides through the first power supply ELVDD, the 5th transistor T 5, the 3rd transistor T 3 and the 6th transistor T 6.
In pixel 101, because driving transistors (for example, the 3rd transistor T 3) threshold voltage inconsistent, the electric current that causes flowing through Organic Light Emitting Diode OLED is inconsistent.The consistance meeting variation of pixel 101 brightness, the quality of image can be inhomogeneous.
Be provided with the 4th transistor T 4 and the 8th transistor T 8, be used for variations in threshold voltage, prevent above-described problem at the initialization time of each frame section compensating during driving transistors (for example, the 3rd transistor T 3).
In pixel 101; Because the leakage current of the 4th transistor T 4 and the 8th transistor T 8, Section Point N2 voltage voltage during the fluorescent lifetime section of each frame changes, concretely; The electric current of the first power supply ELVDD is through the 4th transistor T 4 and the 8th transistor T 8; Flow into Section Point N2, the capacitor C1 stored voltage of winning is raise, thereby the electric current that causes flowing through Organic Light Emitting Diode OLED changes.The stability meeting variation of pixel 101 brightness, image flicker is serious.
Be provided with the first transistor T1 and the 7th transistor T 7 with the 4th transistor T 4 and the 8th transistor T 8 symmetries; And tertiary voltage source ELVL; Be used for preventing above-described problem at fluorescent lifetime section compensating during the 4th transistor T 4 of each frame and the leakage current of the 8th transistor T 8.The 4th transistor T 4, the 8th transistor T 8 and the first transistor T1 and the 7th transistor T 7 are on all four; The rising of the first capacitor stores voltage that the first transistor T1 and the 7th transistor T 7 can reduce to cause through the leakage current that the first power supply ELVDD, the 4th transistor T 4 and the 8th transistor T 8 flow into.The voltage of the 3rd power supply ELVL is lower than the voltage of Section Point N2, and voltage difference is VD1; The voltage of the first power supply ELVDD is higher than the voltage of Section Point N2, and voltage difference is VD2; VD1 equals VD2, thereby makes the leakage current that flows into Section Point N2 through the first power supply ELVDD, the 4th transistor T 4 and the 8th transistor T 8 equal the leakage current through the 3rd power supply ELVL, the first transistor T1 and the 7th transistor T 7 outflow Section Point N2.Thereby improved the characteristic of the flicker of pixel 101, and shown image with balanced picture quality.
Fig. 4 is the pixel drive signal oscillogram of active array organic light emitting display device of the present invention.
Please continue with reference to Fig. 4, line-scanning period of every capable pixel is divided into very first time section t1, second time period t 2 and the 3rd time period t 3, time period t 0 is a switching interval, avoids the circuit sequence conflict, and duty makes a mistake.During being set to the very first time section t1 of initialization time section, at first low level scan control signal Sn3 is offered pixel 101; Therefore, the first transistor T1 and the conducting of the 7th transistor T 7 through low level scan control signal Sn3.Thereby the voltage of the 3rd power supply ELVL is provided for Section Point N2; Here, the 3rd power supply ELVL is designed to be lower than the desired value of Section Point N2 during every frame fluorescent lifetime section, makes the absolute value of voltage difference of the 3rd power supply ELVL and Section Point N2 equal the absolute value of the voltage difference of the Section Point N2 and the first power supply ELVDD; (for example 0V can adopt existing various real-time regulated circuit to said the 3rd power supply ELVL, and is identical with the mode that produces ELVDD and ELVSS voltage signal by the generation of external drive circuit real-time regulated; The type of adoptable power supply chip comprises the chip that boosts, step-down chip, voltage reversal chip; The DC-DC converter, LDO or the like is when active array organic light emitting display device dispatches from the factory; Or carry out adjustment in use for some time as required; Detail no longer one by one at this), the first power supply ELVDD is high level 5V, second source ELVSS is low level-5V.
In the embodiments of the invention that in Fig. 3, show; During very first time section t1; Can the voltage of the 3rd power supply ELVL be offered Section Point N2 as resetting voltage through the first transistor T1 and the 7th transistor T 7, thereby Section Point N2 can be reset to the 3rd power supply ELVL consistently in each frame.
Be set to programme second time period t 2 of time period during, low level scan control signal Sn2 offered pixel 101 thereafter; Then, transistor seconds T2, the 8th transistor T 8 and the 4th transistor T 4 respond low level scan control signal Sn2 and conducting; The 3rd transistor T 3 conductings that are connected with the 4th transistor T 4 and by diode through the 8th transistor T 8 (when the 8th transistor T 8 and 4 conductings of the 4th transistor T, 3 conductings of the 3rd transistor T, equivalence are a diode current flow job); Because Section Point N2 is initialised during very first time section t1, so the 3rd transistor T 3 is connected by diode at forward (source electrode or the drain electrode that link to each other with the high level first power supply ELVDD).
The data-signal Vdata that therefore, will offer data line Dm through transistor seconds T2, the 8th transistor T 8 and the 4th transistor T 4 offers Section Point N2; At this moment because the 3rd transistor T 3 connected by diode, so and the difference correspondent voltage between the threshold voltage of data-signal Vdata and the 3rd transistor T 3 be provided for Section Point N2; The voltage that offers Section Point N2 charges to the first capacitor C1.
Thereafter, during being set to the 3rd time period t 3 of fluorescent lifetime section, scan control signal Sn1 transits to low level; Then, the 5th transistor T 5 and the 6th transistor T 6 conducting through scan control signal Sn1; Therefore, drive current flows to second source ELVSS along the first power supply ELVDD through the path of the 5th transistor T 5, the 3rd transistor T 3, the 6th transistor T 6 and Organic Light Emitting Diode OLED.
Here, the 3rd transistor T 3 is stored among the first capacitor C1 in response to the threshold voltage correspondent voltage that offers the 3rd transistor T 3, so the threshold voltage for the 3rd transistor T 3 compensates during the 3rd time period t 3.
In sum; AMOLED pixel provided by the invention (for example has the threshold voltage compensation transistor; The 4th transistor T 4 and the 8th transistor T 8); Said threshold voltage compensation transistor at start time section t1 with the information stores of threshold voltage to the first capacitor C1, thereby improve the light characteristic of pixel, can show image with balanced picture quality; Each pixel (for example has the leakage compensated transistor; The first transistor T1 and the 7th transistor T 7); Said leakage compensated transistor is used in the glow phase t3 of pixel compensation because the variation of the grid voltage of the driving transistors (for example, the 3rd transistor T 3) that the leakage current of threshold voltage compensation transistor (for example, the 4th transistor T 4 and the 8th transistor T 8) causes; Thereby can improve the blinking characteristic of pixel, show image with low flicker picture quality.
Though the present invention discloses as above with preferred embodiment; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little modification and perfect, so protection scope of the present invention is when being as the criterion with what claims defined.
Claims (2)
1. AMOLED image element circuit; Comprise being the pixel cell that the capable m column matrix of n distributes, said pixel cell links to each other with data driver through data line, links to each other with scanner driver through sweep trace; Each pixel cell includes OLED OLED, and n, m are natural number; It is characterized in that:
Every capable pixel cell comprises the first scan control line Sn1, the second scan control line Sn2 and the 3rd scan control line Sn2; Said Organic Light Emitting Diode OLED is connected between 6 drain electrodes of the 6th transistor T and the second source ELVSS;
Every capable pixel cell also comprises:
The first transistor T1 is connected between Section Point N2 and the 7th transistor T 7 source electrodes, and its grid connects the 3rd scan control line Sn3; Transistor seconds T2 is connected between the drain electrode of data line Dm and the 3rd transistor T 3, and its grid is connected to the second scan control line Sn2; The 3rd transistor T 3 is connected between first node N1 and the 6th transistor T 6 source electrodes, and its grid is received Section Point N2; The first capacitor C1 is connected between the Section Point N2 and the first power supply ELVDD;
The 4th transistor T 4 is connected between the source electrode of grid and the 8th transistor T 8 of the 3rd transistor T 3, and its grid is connected to the second scan control line Sn2; The 5th transistor T 5 is connected between the first power supply ELVDD and the first node N1, and its grid is connected to the first scan control line Sn1; The 6th transistor T 6 is connected between 3 drain electrodes of the 3rd transistor T and the Organic Light Emitting Diode OLED anode, and its grid is connected to the first scan control line Sn1; The 7th transistor T 7 is connected between the first transistor T1 drain electrode and the 3rd power supply ELVL, and its grid is connected to the 3rd scan control line Sn3; The 8th transistor T 8 is connected between 4 drain electrodes of the 4th transistor T and the first node N1, and its grid is connected to the second scan control line Sn2;
Said the 3rd power supply ELVL is produced by the external drive circuit real-time regulated, and the absolute value of the voltage difference of said the 3rd power supply ELVL and Section Point N2 equals the absolute value of the voltage difference of the Section Point N2 and the first power supply ELVDD.
2. an AMOLED image element circuit driving method as claimed in claim 1 is characterized in that said method comprises the steps:
The line-scanning period of every capable pixel is divided into very first time section t1, second time period t 2 and the 3rd time period t 3;
At first, during very first time section t1, scanner driver output low level control signal to the three scan control line Sn3 open the first transistor T1 and the 7th transistor T 7, and the current potential with Section Point N2 in each frame resets to the 3rd power supply ELVL;
Thereafter, during second time period t 2 of time period that is set to programme, scanner driver output low level control signal is opened transistor seconds T2, the 8th transistor T 8 and the 4th transistor T 4 to the second scan control line Sn2; Because Section Point N2 is initialised during very first time section t1; So the 3rd transistor T 3 conductings; To first capacitor C1 charging, the magnitude of voltage when final charging finishes is from the difference between the threshold voltage of the data-signal Vdata of data line Dm and the 3rd transistor T 3;
At last; During the 3rd time period t 3; Scanner driver output low level control signal is to the first scan control line Sn1; Open the 5th transistor T 5 and the 6th transistor T 6, drive current flows to second source ELVSS, the normal luminous display image of current line pixel along the first power supply ELVDD through the path of the 5th transistor T 5, the 3rd transistor T 3, the 6th transistor T 6 and Organic Light Emitting Diode OLED.
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