CN105551426B - AMOLED pixel cells and its driving method, AMOLED display device - Google Patents

AMOLED pixel cells and its driving method, AMOLED display device Download PDF

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Publication number
CN105551426B
CN105551426B CN201410593849.4A CN201410593849A CN105551426B CN 105551426 B CN105551426 B CN 105551426B CN 201410593849 A CN201410593849 A CN 201410593849A CN 105551426 B CN105551426 B CN 105551426B
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transistor
source
scan control
control line
grid
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CN105551426A (en
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杨楠
朱晖
胡思明
汪锐
黄秀颀
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Kunshan New Flat Panel Display Technology Center Co Ltd
Kunshan Guoxian Photoelectric Co Ltd
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Kunshan New Flat Panel Display Technology Center Co Ltd
Kunshan Guoxian Photoelectric Co Ltd
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Abstract

The invention provides a kind of AMOLED pixel cells and its driving method, AMOLED display device, and the grid of third transistor is initialized by initialization unit;Voltage corresponding to data-signal is stored to capacitor by data write unit;Realize that organic light emitting diode lights by luminous controling unit, influence of the difference of leakage current or threshold voltage to capacitor is thus avoid, so that AMOLED display device brightness uniformity.Further, by reducing voltage source, AMOLED pixel cells are simplified.

Description

AMOLED pixel cells and its driving method, AMOLED display device
Technical field
The present invention relates to flat panel display technology field, more particularly to a kind of AMOLED pixel cells and its driving side Method, AMOLED display device.
Background technology
In recent years, various types of FPD in light weight and small volume compared to for cathode-ray tube have been developed Device.In various types of panel display apparatus, because active array organic light emitting display device (AMOLED) use is spontaneous The Organic Light Emitting Diode (OLED) of light carrys out display image, generally has the response time short, is driven using low-power consumption, relatively More preferable brightness and the characteristic of colour purity, so organic light-emitting display device has become the focus of display device of future generation.
For large-scale active array organic light emitting display device, including positioned at the more of the intersection region of scan line and data wire Individual pixel.Each pixel includes Organic Light Emitting Diode and the image element circuit for driving the Organic Light Emitting Diode.Pixel Circuit generally includes switching transistor, driving transistor and storage.The pixel of active array organic light emitting display device Characteristic be driven difference and switching transistor between transistor leakage current unfavorable factor influence, therefore pass through this The quality uniformity and uniformity for the image that multiple pixels of sample are shown are poor.
Fig. 1 is refer to, it is the circuit diagram of the conventional pixel of active array organic light emitting display device.As shown in figure 1, have The conventional pixel 10 of source matrix organic light-emitting display device includes Organic Light Emitting Diode (OLED) 14, and is already attached to number According to line Dm and scan control line Sn to control the image element circuit 12 of organic light emitting diode (OLED) 14.
Specifically, image element circuit 12 includes being connected to the first power supply ELVDD and the anode of Organic Light Emitting Diode (OLED) 14 Between second transistor M2 (i.e. driving transistor), be connected to second transistor M2 grid and data wire Dm between first Transistor M1 (i.e. switching transistor) and the capacitor being connected between second transistor M2 grid and the first power supply ELVDD Cs, wherein the first transistor M1 grid are connected to scan control line Sn.The anode connection of Organic Light Emitting Diode (OLED) 14 Negative electrode to image element circuit 12, and Organic Light Emitting Diode (OLED) 14 is connected to second source ELVSS.Organic light-emitting diodes Pipe (OLED) 14 sends the light with brightness corresponding with the electric current that image element circuit 12 is provided.
When providing scanning signal to scan control line Sn, image element circuit 12 corresponds to supply data wire Dm data-signal To control the magnitude of current of supply Organic Light Emitting Diode (OLED) 14.Specifically, the first transistor M1 grid is connected to scanning Control line Sn, and the first transistor M1 source electrode (or drain electrode) is connected to data wire Dm, the first transistor M1 drain electrode (or source Pole) it is connected to a capacitor Cs terminal.When providing scan control signal from scan control line Sn to the first transistor M1, The first transistor M1 is turned on, and is supplied to capacitor Cs from the data-signal of data wire Dm supplies.A capacitor Cs end Son is connected to second transistor M2 grid, and capacitor Cs another terminal is connected to the first power supply ELVDD.With data Voltage corresponding to signal is charged into capacitor Cs.Now, voltage corresponding with data-signal is stored in capacitor Cs.
Second transistor M2 grid is connected to a capacitor Cs terminal, and second transistor M2 source electrode connection To the first power supply ELVDD, second transistor M2 drain electrode is connected to the anode of Organic Light Emitting Diode (OLED) 14.Second crystal Pipe M2 is controlled to the electric current for flowing to second source ELVSS by Organic Light Emitting Diode (OLED) 14 from the first power supply ELVDD System, the electric current correspond to the voltage being stored in capacitor Cs.
Conventional pixel 10 corresponding to the voltage being filled with capacitor Cs to Organic Light Emitting Diode (OLED) 14 by supplying Induced current controls the brightness of Organic Light Emitting Diode (OLED) 14, image of the display with predetermined luminance.However, in this biography In the active array organic light emitting display device of system, due to second transistor M2 threshold voltage variation and the first transistor M1 Leakage current, it is difficult to show the image with uniform luminance.
Such as in different pixels due to second transistor M2 threshold voltage difference so that add identical grid It is inconsistent that the electric current of Organic Light Emitting Diode (OLED) is flowed through during driving voltage, causes Organic Light Emitting Diode (OLED) brightness Inconsistent, each same data-signal of pixel response, produce with different brightness light, so as to be difficult display have uniformly it is bright The image of degree.
Therefore, Publication No. CN1577453A application for a patent for invention " organic light emitting device pixel circuit and its driving side A kind of image element circuit is disclosed in method ", specifically refer to Fig. 2.The image element circuit has threshold voltage compensation effect, but the pixel Circuit includes three supply voltages VDD, Vinit and VSS, and voltage source is on the high side, so as to cause the image element circuit more complicated;Simultaneously Image element circuit initialization relies on Vinit, and what is be connected with driving transistor T31 grids has two branch roads, respectively by switch Pipe T33 and T34, so as to form two electric leakage circulation roads so that leakage current is bigger during dark-state.
Therefore it provides the AMOLED pixel cells and AMOLED display device of a kind of brightness uniformity are still that this area urgently solves A great problem certainly.
The content of the invention
It is an object of the invention to provide a kind of AMOLED pixel cells and its driving method, AMOLED display device, with Solve the problems, such as existing AMOLED display device brightness irregularities.
In order to solve the above technical problems, the present invention provides a kind of AMOLED pixel cells, the AMOLED pixel cells with Scan control line, data wire connect with power supply, and the AMOLED pixel cells include:Image element circuit and with the image element circuit connect The organic light emitting diode connect;The image element circuit includes:Capacitor, the initialization unit being connected with the capacitor, data Writing unit and luminous controling unit;Wherein,
The data write unit includes second transistor, third transistor and the 4th transistor, the second transistor Source/drain be connected with the source/drain of the third transistor, the grid of the second transistor and the 4th crystal The grid connection of pipe, the grid of the third transistor are connected with the drain/source of the 4th transistor;
The luminous controling unit includes third transistor, the 5th transistor and the 6th transistor, the third transistor Source/drain be connected with the source/drain of the 5th transistor, the drain/source of the third transistor and described the The source/drain connection of six transistors;
The initialization unit includes one or more transistors, and one or more of transistors are connected to the 3rd crystal Between tube grid and Organic Light Emitting Diode anode.
Optionally, in described AMOLED pixel cells, the power supply includes the first power supply and second source, the picture Plain circuit is connected to the first power supply;The Organic Light Emitting Diode is connected to second source.
Optionally, in described AMOLED pixel cells, the scan control line includes the second scan control line and the Three scan control lines, the drain/source of the second transistor are connected to data wire;The grid of 4th transistor is connected to Second scan control line;The drain/source of 5th transistor is connected to the first power supply, and the grid of the 5th transistor connects It is connected to the 3rd scan control line;The grid of 6th transistor is connected to the 3rd scan control line.
Optionally, in described AMOLED pixel cells, the scan control line also includes the first scan control line, institute Stating the transistor in initialization unit includes the first transistor and the 4th transistor, the source/drain of the first transistor with The source/drain connection of 4th transistor, the grid of the first transistor are connected to the first scan control line.
Optionally, in described AMOLED pixel cells, the scan control line also includes the first scan control line, institute Stating the transistor in initialization unit includes the first transistor, and the grid of the first transistor is connected to the first scan control Line.
Optionally, in described AMOLED pixel cells, the transistor in the initialization unit includes the 4th crystal Pipe and the 6th transistor, the source/drain of the 4th transistor are connected with the source/drain of the 6th transistor.
The present invention also provides a kind of driving method of AMOLED pixel cells, the driving method of the AMOLED pixel cells Including:
Initial phase:Initialization unit turns on, and second source is by the transistor in initialization unit to the 3rd crystal The grid initialization of pipe;
Data write phase:Scan control signal is supplied to the second scan control line, data write unit conducting, by data Voltage corresponding to signal is stored to capacitor;
Glow phase:Scan control signal is supplied to the 3rd scan control line, luminous controling unit conducting, organic light emission two Pole tube light-emitting.
Optionally, in the driving method of described AMOLED pixel cells, in initial phase, scan control signal carries The first scan control line and the second scan control line are supplied, second source is by the first transistor and the 4th transistor, to the 3rd The grid initialization of transistor.
Optionally, in the driving method of described AMOLED pixel cells, in initial phase, scan control signal carries The first scan control line is supplied, by the first transistor, second source initializes to the grid of third transistor.
Optionally, in the driving method of described AMOLED pixel cells, in initial phase, scan control signal carries The second scan control line and the 3rd scan control line are supplied, second source is by the 4th transistor and the 6th transistor, to the 3rd The grid initialization of transistor.
Optionally, in the driving method of described AMOLED pixel cells, in data write phase, scan control signal The second scan control line is supplied to, will be electric corresponding to data-signal by second transistor, third transistor and the 4th transistor Pressure is stored to capacitor;In glow phase, scan control signal is supplied to the 3rd scan control line, passes through third transistor, Five transistors and the 6th transistor, organic light emitting diode light.
The present invention also provides a kind of AMOLED display device, and the AMOLED display device includes:It is multiple as described above AMOLED pixel cells, scanner driver and data driver;Multiple AMOLED pixel unit arrays arrangements, each AMOLED pictures Plain unit is connected with the scanner driver, and each AMOLED pixel cells are connected with the data driver.
In AMOLED pixel cells provided by the invention and its driving method, AMOLED display device, pass through initialization Unit initializes to the grid of third transistor;Voltage corresponding to data-signal is stored to electric capacity by data write unit Device;Realize that organic light emitting diode lights by luminous controling unit, thus avoid the difference of leakage current or threshold voltage Influence to capacitor so that AMOLED display device brightness uniformity.Further, by reducing voltage source, simplify AMOLED pixel cells.
Brief description of the drawings
Fig. 1 is the circuit diagram of the conventional pixel of active array organic light emitting display device;
Fig. 2 is the circuit diagram of AMOLED pixel cells of the prior art;
Fig. 3 is the circuit diagram of the AMOLED pixel cells of the embodiment of the present invention one;
Fig. 4 is the drive signal timing diagram of the AMOLED pixel cells of the embodiment of the present invention one;
Fig. 5 is the circuit diagram of the AMOLED pixel cells of the embodiment of the present invention two;
Fig. 6 is the drive signal timing diagram of the AMOLED pixel cells of the embodiment of the present invention two;
Fig. 7 is the circuit diagram of the AMOLED pixel cells of the embodiment of the present invention three;
Fig. 8 is the drive signal timing diagram of the AMOLED pixel cells of the embodiment of the present invention three;
Fig. 9 is the mount structure schematic diagram of the AMOLED display device of the embodiment of the present invention four.
Embodiment
Below in conjunction with the drawings and specific embodiments to AMOLED pixel cells proposed by the present invention and its driving method, AMOLED display device is described in further detail.According to following explanation and claims, advantages and features of the invention will Become apparent from.It should be noted that accompanying drawing uses using very simplified form and non-accurately ratio, only to convenient, bright The purpose of the embodiment of the present invention is aided in illustrating clearly.
【Embodiment one】
Fig. 3 is refer to, it is the circuit diagram of the AMOLED pixel cells of the embodiment of the present invention one.It is as shown in figure 3, described AMOLED pixel cells 30 include:Image element circuit 32 and the organic light emitting diode 34 being connected with the image element circuit 32;It is described AMOLED pixel cells are used for and the first scan control line Sn1, the second scan control line Sn2, the 3rd scan control line Sn3 and the One power supply ELVDD, second source ELVSS and data wire Dm connections;The image element circuit 32 includes:Capacitor Cs, it is and described Initialization unit, data write unit and the luminous controling unit of capacitor Cs connections;Wherein,
The data write unit includes second transistor M2, third transistor M3 and the 4th transistor M4, and described second Transistor M2 source/drain is connected with the source/drain of the third transistor M3, the grid of the second transistor M2 with The grid connection of the 4th transistor M4, the drain/source of the grid of the third transistor M3 and the 4th transistor M4 Pole connects;
The luminous controling unit includes third transistor M3, the 5th transistor M5 and the 6th transistor M6, and the described 3rd Transistor M3 source/drain is connected with the source/drain of the 5th transistor M5, and the drain electrode of the third transistor M3/ Source electrode is connected with the source/drain of the 6th transistor M6.
In the embodiment of the present application, the initialization unit includes the first transistor M1 and the 4th transistor M4, and described One transistor M1 and the 4th transistor M4 are connected between third transistor M3 grids and Organic Light Emitting Diode anode, specifically Ground, the first transistor M1 source/drain are connected with the source/drain of the 4th transistor M4, the first transistor M1 Grid be connected to the first scan control line Sn1, the 4th transistor M4 grid and be connected to the second scan control line Sn2.
Further, the image element circuit 32 is connected to the first power supply ELVDD;The Organic Light Emitting Diode 34 is connected to Second source ELVSS.The drain/source of the second transistor M2 is connected to data wire Dm;The leakage of the 5th transistor M5 Pole/source electrode is connected to the first power supply ELVDD, and the grid of the 5th transistor M5 is connected to the 3rd scan control line Sn3;It is described 6th transistor M6 grid is connected to the 3rd scan control line Sn3.
For the ease of describing the potential change of some nodes in the image element circuit 32, by capacitor Cs and third transistor M3 grid, the 4th transistor M4 drain/source between tie point be set to first node N1;By second transistor M2 source Tie point between the source/drain of pole/drain electrode, third transistor M3 source/drain and the 5th transistor M5 is set to second Node N2.
In the embodiment of the present application, the first transistor M1, second transistor M2, third transistor M3, the 4th crystal Pipe M4, the 5th transistor M5 and the 6th transistor M6 are PMOS transistor or are nmos pass transistor.
Subsequently, will be with the first transistor M1, second transistor M2, third transistor M3, the 4th transistor M4, Five transistor M5 and the 6th transistor M6 are the working condition of narration AMOLED pixel cells 30 exemplified by PMOS transistor.
In the embodiment of the present application, the driving method of the AMOLED pixel cells 30 includes:
Initial phase:Scan control signal is supplied to the first scan control line and the second scan control line, initialization list Member conducting, second source are initialized by the transistor in initialization unit to the grid of third transistor;
Data write phase:Scan control signal is supplied to the second scan control line, data write unit conducting, by data Voltage corresponding to signal is stored to capacitor;
Glow phase:Scan control signal is supplied to the 3rd scan control line, luminous controling unit conducting, organic light emission two Level pipe is luminous.
Specifically, incorporated by reference to Fig. 4 and Fig. 3, wherein, Fig. 4 is the driving of the AMOLED pixel cells of the embodiment of the present invention one Signal timing diagram, the drive signal during a frame is illustrate only herein.
Specifically, during the first time period t1 of initial phase is arranged to, the first scan control line Sn1 and second is swept Control line Sn2 access low level signals are retouched, now, the first transistor M1 and the 4th transistor M4 conductings, so as to second source ELVSS voltage is provided to first node N1, and first node N1 current potentials are dragged down, that is, passes through the first transistor M1, the 4th crystalline substance Body pipe M4 and Organic Light Emitting Diode 34 are initialized to third transistor M3 grid.
Then, during the second time period t2 of data write phase is arranged to, the second scan control line Sn2 continues to access Low level signal, now, second transistor M2 and the 4th transistor M4 respond the low level letter that the second scan control line Sn2 is accessed Number and turn on.Third transistor M3 conductings are made (here, equivalent to one two poles of third transistor M3 by the 4th transistor M4 Pipe).Because first node N1 is initialised during first time period t1, so third transistor M3 is positive as diode Connection.Thus, by by second transistor M2, third transistor M3 and the 4th transistor the M4 corresponding voltages of data-signal Vm It is stored in capacitor Cs.
Here, third transistor M3 is in response to being supplied to the third transistor M3 corresponding voltage of threshold voltage to be stored in electricity In container Cs, so being compensated during second time period t2 for third transistor M3 threshold voltage.
Then, during the 3rd time period t 3 of glow phase is arranged to, the 3rd scan control line Sn3 accesses signal by height Level transition is to low level.Then, the 5th transistor M5 is led by responding the 3rd scan control line Sn3 low level signal It is logical.Thus, driving current along the first power supply ELVDD by the 5th transistor M5, third transistor M3, the 6th transistor M6, have The path of machine Light-Emitting Diode 34 flows to second source ELVSS, i.e. Organic Light Emitting Diode (OLED) 34 is luminous.
Wherein, flowing through the electric current of organic light emitting diode 34 can approximately be expressed as:
IOLED=1/2*K* [Vsg- | Vth |] ^2
=1/2*K* [Vdd- (Vdata- | Vth |)-| Vth |] ^2
=1/2*K* [Vdd-Vdata] ^2
Wherein, K is coefficient, and Vsg represents the gate source voltage of driving transistor, and Vth represents the threshold voltage of driving transistor, Vdd represents the first power supply ELVDD voltages, and Vdata represents data-signal Vm voltages.It is visible according to above-mentioned formula, the present embodiment The influence of the luminous threshold voltage for being not driven transistor of organic light emitting diode 34.
Here, high level scan control signal is being supplied to the 3rd scan control line Sn3 period, the 6th transistor M6 ends, so as to prevent driving current to be provided to Organic Light Emitting Diode (OLED) 34.In addition, it is connected with capacitor Cs Leakage current paths there was only one, so as to reduce leakage current.
As fully visible, the grid of third transistor is initialized by initialization unit;By data write unit by number It is believed that number corresponding to voltage store to capacitor;Realize that organic light emitting diode lights by luminous controling unit, thus avoid Influence of the difference of leakage current or threshold voltage to capacitor, so that AMOLED display device brightness uniformity. Further, by reducing voltage source, AMOLED pixel cells are simplified.
【Embodiment two】
Fig. 5 is refer to, it is the circuit diagram of the AMOLED pixel cells of the embodiment of the present invention two.It is as shown in figure 5, described AMOLED pixel cells 40 include:Image element circuit 42 and the organic light emitting diode 44 being connected with the image element circuit 42;It is described AMOLED pixel cells are used for and the first scan control line Sn1, the second scan control line Sn2, the 3rd scan control line Sn3 and the One power supply ELVDD, second source ELVSS and data wire Dm connections;The image element circuit 42 includes:Capacitor Cs, it is and described Initialization unit, data write unit and the luminous controling unit of capacitor Cs connections;Wherein,
The data write unit includes second transistor M2, third transistor M3 and the 4th transistor M4, and described second Transistor M2 source/drain is connected with the source/drain of the third transistor M3, the grid of the second transistor M2 with The grid connection of the 4th transistor M4, the drain/source of the grid of the third transistor M3 and the 4th transistor M4 Pole connects;
The luminous controling unit includes third transistor M3, the 5th transistor M5 and the 6th transistor M6, and the described 3rd Transistor M3 source/drain is connected with the source/drain of the 5th transistor M5, and the drain electrode of the third transistor M3/ Source electrode is connected with the source/drain of the 6th transistor M6.
In the embodiment of the present application, the initialization unit includes the first transistor M1, the first transistor M1 connections Between third transistor M3 grids and Organic Light Emitting Diode anode, specifically, the first transistor M1 grid is connected to One scan control line Sn1.
Further, the image element circuit 42 is connected to the first power supply ELVDD;The Organic Light Emitting Diode 44 is connected to Second source ELVSS.The drain/source of the second transistor M2 is connected to data wire Dm;The grid of the 4th transistor M4 Pole is connected to the second scan control line Sn2;The drain/source of the 5th transistor M5 is connected to the first power supply ELVDD, described 5th transistor M5 grid is connected to the 3rd scan control line Sn3;The grid of the 6th transistor M6 is connected to the 3rd and swept Retouch control line Sn3.It is for the ease of describing the potential change of some nodes in the image element circuit 42, capacitor Cs and first is brilliant Body pipe M1 source/drain, third transistor M3 grid, the 4th transistor M4 drain/source between tie point be set to First node N1;By second transistor M2 source/drain, third transistor M3 source/drain and the 5th transistor M5 Tie point between source/drain is set to section point N2.
In the embodiment of the present application, the first transistor M1, second transistor M2, third transistor M3, the 4th crystal Pipe M4, the 5th transistor M5 and the 6th transistor M6 are PMOS transistor or are nmos pass transistor.
Subsequently, will be with the first transistor M1, second transistor M2, third transistor M3, the 4th transistor M4, Five transistor M5 and the 6th transistor M6 are the working condition of narration AMOLED pixel cells 40 exemplified by PMOS transistor.
In the embodiment of the present application, the driving method of the AMOLED pixel cells 40 includes:
Initial phase:Scan control signal is supplied to the first scan control line, initialization unit conducting, and second source leads to The transistor crossed in initialization unit initializes to the grid of third transistor;
Data write phase:Scan control signal is supplied to the second scan control line, data write unit conducting, by data Voltage corresponding to signal is stored to capacitor;
Glow phase:Scan control signal is supplied to the 3rd scan control line, luminous controling unit conducting, organic light emission two Level pipe is luminous.
Specifically, incorporated by reference to Fig. 6 and Fig. 5, wherein, Fig. 6 is the driving of the AMOLED pixel cells of the embodiment of the present invention two Signal timing diagram, the drive signal during a frame is illustrate only herein.
Specifically, during the first time period t1 of initial phase is arranged to, the first scan control line Sn1 accesses low electricity Ordinary mail number, now, the first transistor M1 conductings, so as to which second source ELVSS voltage is provided to first node N1, by the One node N1 current potentials drag down, i.e., third transistor M3 grid are entered by the first transistor M1 and Organic Light Emitting Diode 44 Initialization is gone.
Then, during the second time period t2 of data write phase is arranged to, the second scan control line Sn2 accesses low electricity Ordinary mail number, now, second transistor M2 and the 4th transistor M4 respond the low level signal of the second scan control line Sn2 accesses and Conducting.Third transistor M3 is set to turn on (here, equivalent to one diode of third transistor M3) by the 4th transistor M4. Because first node N1 is initialised during first time period t1, so third transistor M3 is connected as diode by forward direction Connect.Thus, the corresponding voltages of data-signal Vm by second transistor M2, third transistor M3 and the 4th transistor M4 are deposited Storage is in capacitor Cs.
Here, third transistor M3 is in response to being supplied to the third transistor M3 corresponding voltage of threshold voltage to be stored in electricity In container Cs, so being compensated during second time period t2 for third transistor M3 threshold voltage.
Then, during the 3rd time period t 3 of glow phase is arranged to, the 3rd scan control line Sn3 accesses signal by height Level transition is to low level.Then, the 5th transistor M5 is led by responding the 3rd scan control line Sn3 low level signal It is logical.Thus, driving current along the first power supply ELVDD by the 5th transistor M5, third transistor M3, the 6th transistor M6, have The path of machine Light-Emitting Diode 44 flows to second source ELVSS, i.e. Organic Light Emitting Diode (OLED) 44 is luminous.
Wherein, flowing through the electric current of organic light emitting diode 44 can approximately be expressed as:
IOLED=1/2*K* [Vsg- | Vth |] ^2
=1/2*K* [Vdd- (Vdata- | Vth |)-| Vth |] ^2
=1/2*K* [Vdd-Vdata] ^2
Wherein, K is coefficient, and Vsg represents the gate source voltage of driving transistor, and Vth represents the threshold voltage of driving transistor, Vdd represents the first power supply ELVDD voltages, and Vdata represents data-signal Vm voltages.It is visible according to above-mentioned formula, the present embodiment The influence of the luminous threshold voltage for being not driven transistor of organic light emitting diode 44.
Here, high level scan control signal is being supplied to the 3rd scan control line Sn3 period, the 6th transistor M6 ends, so as to prevent driving current to be provided to Organic Light Emitting Diode (OLED) 44.In addition, it is connected with capacitor Cs Leakage current paths there was only one, so as to reduce leakage current.
As fully visible, the grid of third transistor is initialized by initialization unit;By data write unit by number It is believed that number corresponding to voltage store to capacitor;Realize that organic light emitting diode lights by luminous controling unit, thus avoid Influence of the difference of leakage current or threshold voltage to capacitor, so that AMOLED display device brightness uniformity. Further, by reducing voltage source, AMOLED pixel cells are simplified.
【Embodiment three】
Fig. 7 is refer to, it is the circuit diagram of the AMOLED pixel cells of the embodiment of the present invention three.It is as shown in fig. 7, described AMOLED pixel cells 50 include:Image element circuit 52 and the organic light emitting diode 54 being connected with the image element circuit 52;It is described AMOLED pixel cells are used for and the second scan control line Sn2, the 3rd scan control line Sn3 and the first power supply ELVDD, the second electricity Source ELVSS and data wire Dm connections;The image element circuit 52 includes:Capacitor Cs, it is connected with the capacitor Cs initial Change unit, data write unit and luminous controling unit;Wherein,
The data write unit includes second transistor M2, third transistor M3 and the 4th transistor M4, and described second Transistor M2 source/drain is connected with the source/drain of the third transistor M3, the grid of the second transistor M2 with The grid connection of the 4th transistor M4, the drain/source of the grid of the third transistor M3 and the 4th transistor M4 Pole connects;
The luminous controling unit includes third transistor M3, the 5th transistor M5 and the 6th transistor M6, and the described 3rd Transistor M3 source/drain is connected with the source/drain of the 5th transistor M5, and the drain electrode of the third transistor M3/ Source electrode is connected with the source/drain of the 6th transistor M6.
In the embodiment of the present application, the initialization unit includes the 4th transistor M4 and the 6th transistor M6, and described Four transistor M4 and the 6th transistor M6 are connected between third transistor M3 grids and Organic Light Emitting Diode anode, specifically Ground, the 4th transistor M4 source/drain are connected with the source/drain of the 6th transistor M6, the 4th transistor M4 Grid be connected to the second scan control line Sn2, the grid of the 6th transistor M6 is connected to the 3rd scan control line Sn3.
Further, the image element circuit 52 is connected to the first power supply ELVDD;The Organic Light Emitting Diode 54 is connected to Second source ELVSS.The drain/source of the second transistor M2 is connected to data wire Dm;The leakage of the 5th transistor M5 Pole/source electrode is connected to the first power supply ELVDD, and the grid of the 5th transistor M5 is connected to the 3rd scan control line Sn3.
For the ease of describing the potential change of some nodes in the image element circuit 52, by capacitor Cs and third transistor M3 grid, the 4th transistor M4 drain/source between tie point be set to first node N1;By second transistor M2 source Tie point between the source/drain of pole/drain electrode, third transistor M3 source/drain and the 5th transistor M5 is set to second Node N2.
In the embodiment of the present application, second transistor M2, third transistor M3, the 4th transistor M4, the 5th transistor M5 And the 6th transistor M6 be PMOS transistor or be nmos pass transistor.
Subsequently, will with the second transistor M2, third transistor M3, the 4th transistor M4, the 5th transistor M5 and 6th transistor M6 is the working condition of narration AMOLED pixel cells 30 exemplified by PMOS transistor.
In the embodiment of the present application, the driving method of the AMOLED pixel cells 50 includes:
Initial phase:Scan control signal is supplied to the second scan control line and the 3rd scan control line, initialization list Member conducting, second source are initialized by the transistor in initialization unit to the grid of third transistor;
Data write phase:Scan control signal is supplied to the second scan control line, data write unit conducting, by data Voltage corresponding to signal is stored to capacitor;
Glow phase:Scan control signal is supplied to the 3rd scan control line, luminous controling unit conducting, organic light emission two Level pipe is luminous.
Specifically, incorporated by reference to Fig. 8 and Fig. 7, wherein, Fig. 8 is the driving of the AMOLED pixel cells of the embodiment of the present invention three Signal timing diagram, the drive signal during a frame is illustrate only herein.
Specifically, during the first time period t1 of initial phase is arranged to, the second scan control line Sn2 and the 3rd is swept Control line Sn3 access low level signals are retouched, now, the 4th transistor M4 and the 6th transistor M6 conductings, so as to second source ELVSS voltage is provided to first node N1, and first node N1 current potentials are dragged down, that is, passes through the 4th transistor M4, the 6th crystalline substance Body pipe M6 and Organic Light Emitting Diode 54 are initialized to third transistor M3 grid.
Then, during the second time period t2 of data write phase is arranged to, the second scan control line Sn2 continues to access Low level signal, now, second transistor M2 and the 4th transistor M4 respond the low level letter that the second scan control line Sn2 is accessed Number and turn on.Third transistor M3 conductings are made (here, equivalent to one two poles of third transistor M3 by the 4th transistor M4 Pipe).Because first node N1 is initialised during first time period t1, so third transistor M3 is positive as diode Connection.Thus, by by second transistor M2, third transistor M3 and the 4th transistor the M4 corresponding voltages of data-signal Vm It is stored in capacitor Cs.
Here, third transistor M3 is in response to being supplied to the third transistor M3 corresponding voltage of threshold voltage to be stored in electricity In container Cs, so being compensated during second time period t2 for third transistor M3 threshold voltage.
Then, during the 3rd time period t 3 of glow phase is arranged to, the 3rd scan control line Sn3 accesses signal by height Level transition is to low level.Then, the 5th transistor M5 is led by responding the 3rd scan control line Sn3 low level signal It is logical.Thus, driving current along the first power supply ELVDD by the 5th transistor M5, third transistor M3, the 6th transistor M6, have The path of machine Light-Emitting Diode 54 flows to second source ELVSS, i.e. Organic Light Emitting Diode (OLED) 54 is luminous.
Wherein, flowing through the electric current of organic light emitting diode 54 can approximately be expressed as:
IOLED=1/2*K* [Vsg- | Vth |] ^2
=1/2*K* [Vdd- (Vdata- | Vth |)-| Vth |] ^2
=1/2*K* [Vdd-Vdata] ^2
Wherein, K is coefficient, and Vsg represents the gate source voltage of driving transistor, and Vth represents the threshold voltage of driving transistor, Vdd represents the first power supply ELVDD voltages, and Vdata represents data-signal Vm voltages.It is visible according to above-mentioned formula, the present embodiment The influence of the luminous threshold voltage for being not driven transistor of organic light emitting diode 54.
Here, high level scan control signal is being supplied to the 3rd scan control line Sn3 period, the 6th transistor M6 ends, so as to prevent driving current to be provided to Organic Light Emitting Diode (OLED) 54.In addition, it is connected with capacitor Cs Leakage current paths there was only one, so as to reduce leakage current.
As fully visible, the grid of third transistor is initialized by initialization unit;By data write unit by number It is believed that number corresponding to voltage store to capacitor;Realize that organic light emitting diode lights by luminous controling unit, thus avoid Influence of the difference of leakage current or threshold voltage to capacitor, so that AMOLED display device brightness uniformity. Further, by reducing voltage source, AMOLED pixel cells are simplified.
【Example IV】
Accordingly, the present embodiment also provides a kind of AMOLED display device.Specifically, refer to Fig. 9, it is real for the present invention Apply the mount structure schematic diagram of the AMOLED display device of example.As shown in figure 9, the AMOLED display device includes:It is multiple as above Described AMOLED pixel cells (can think AMOLED pixel cells 30, AMOLED pixel cells 40 or AMOLED pixels Unit 50), scanner driver 60 and data driver 70;Multiple AMOLED pixel unit arrays arrangements, each AMOLED pixels Unit is connected (for AMOLED pixel cells 30 and AMOLED pixel cells 40, each with the scanner driver 60 AMOLED pixel cells are connected by three scan control lines with scanner driver;For AMOLED pixel cells 50, often Individual AMOLED pixel cells are connected by two scan control lines with scanner driver 60), each AMOLED pixel cells with The data driver 70 connects (i.e. each AMOLED pixel cells are connected by data wire with data driver 70).
Wherein, scanner driver 60 produces believes with the outside scan control for providing (for example, being provided from timing control unit) Number corresponding scan control signal.Scan control signal scan control line will sequentially it be supplied to as caused by scanning monitor 30 AMOLED pixel cells.
Data driver 70 produces corresponding to the outside data controlling signal for providing (for example, being provided from timing control unit) Data-signal.The data-signal as caused by data driver 70 is provided synchronously to by data wire and scan control signal AMOLED pixel cells.
Each AMOLED pixel cells are initialized by initialization unit to the grid of third transistor;Write by data Unit stores voltage corresponding to data-signal to capacitor;Realize that organic light emitting diode lights by luminous controling unit, Influence of the difference of leakage current or threshold voltage to capacitor is thus avoid, so as to finally cause AMOLED display dresses Put brightness uniformity.Further, by reducing voltage source, AMOLED pixel cells are simplified.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims Scope.

Claims (9)

1. a kind of AMOLED pixel cells, the AMOLED pixel cells are used to be connected with scan control line, data wire and power supply, Characterized in that, the AMOLED pixel cells include:Image element circuit and the organic light emission two level being connected with the image element circuit Pipe;The image element circuit includes:Capacitor, the initialization unit being connected with the capacitor, data write unit and luminous control Unit processed;Wherein,
The data write unit includes second transistor, third transistor and the 4th transistor, the source of the second transistor Pole/drain electrode is connected with the source/drain of the third transistor, the grid of the second transistor and the 4th transistor Grid is connected, and the grid of the third transistor is connected with the drain/source of the 4th transistor;
The luminous controling unit includes third transistor, the 5th transistor and the 6th transistor, the source of the third transistor Pole/drain electrode is connected with the source/drain of the 5th transistor, and the drain/source of the third transistor is brilliant with the described 6th The source/drain connection of body pipe;
The initialization unit includes one or more transistors, and one or more of transistors are connected to third transistor grid Between pole and Organic Light Emitting Diode anode;
The power supply includes the first power supply and second source, and the image element circuit is connected to the first power supply;The organic light emission two Pole pipe is connected to second source;
The scan control line includes the second scan control line and the 3rd scan control line, the drain/source of the second transistor Pole is connected to data wire;The grid of 4th transistor is connected to the second scan control line;The drain electrode of 5th transistor/ Source electrode is connected to the first power supply, and the grid of the 5th transistor is connected to the 3rd scan control line;6th transistor Grid is connected to the 3rd scan control line;
The scan control line also includes the first scan control line, and the transistor in the initialization unit includes the first transistor And the 4th transistor, the source/drain of the first transistor are connected with the source/drain of the 4th transistor, described The grid of one transistor is connected to the first scan control line.
2. a kind of AMOLED pixel cells, the AMOLED pixel cells are used to be connected with scan control line, data wire and power supply, Characterized in that, the AMOLED pixel cells include:Image element circuit and the organic light emission two level being connected with the image element circuit Pipe;The image element circuit includes:Capacitor, the initialization unit being connected with the capacitor, data write unit and luminous control Unit processed;Wherein,
The data write unit includes second transistor, third transistor and the 4th transistor, the source of the second transistor Pole/drain electrode is connected with the source/drain of the third transistor, the grid of the second transistor and the 4th transistor Grid is connected, and the grid of the third transistor is connected with the drain/source of the 4th transistor;
The luminous controling unit includes third transistor, the 5th transistor and the 6th transistor, the source of the third transistor Pole/drain electrode is connected with the source/drain of the 5th transistor, and the drain/source of the third transistor is brilliant with the described 6th The source/drain connection of body pipe;
The initialization unit includes one or more transistors, and one or more of transistors are connected to third transistor grid Between pole and Organic Light Emitting Diode anode;
The power supply includes the first power supply and second source, and the image element circuit is connected to the first power supply;The organic light emission two Pole pipe is connected to second source;
The scan control line includes the second scan control line and the 3rd scan control line, the drain/source of the second transistor Pole is connected to data wire;The grid of 4th transistor is connected to the second scan control line;The drain electrode of 5th transistor/ Source electrode is connected to the first power supply, and the grid of the 5th transistor is connected to the 3rd scan control line;6th transistor Grid is connected to the 3rd scan control line;
The scan control line also includes the first scan control line, and the transistor in the initialization unit includes first crystal Pipe, the grid of the first transistor are connected to the first scan control line.
3. a kind of AMOLED pixel cells, the AMOLED pixel cells are used to be connected with scan control line, data wire and power supply, Characterized in that, the AMOLED pixel cells include:Image element circuit and the organic light emission two level being connected with the image element circuit Pipe;The image element circuit includes:Capacitor, the initialization unit being connected with the capacitor, data write unit and luminous control Unit processed;Wherein,
The data write unit includes second transistor, third transistor and the 4th transistor, the source of the second transistor Pole/drain electrode is connected with the source/drain of the third transistor, the grid of the second transistor and the 4th transistor Grid is connected, and the grid of the third transistor is connected with the drain/source of the 4th transistor;
The luminous controling unit includes third transistor, the 5th transistor and the 6th transistor, the source of the third transistor Pole/drain electrode is connected with the source/drain of the 5th transistor, and the drain/source of the third transistor is brilliant with the described 6th The source/drain connection of body pipe;
The initialization unit includes one or more transistors, and one or more of transistors are connected to third transistor grid Between pole and Organic Light Emitting Diode anode;
The power supply includes the first power supply and second source, and the image element circuit is connected to the first power supply;The organic light emission two Pole pipe is connected to second source;
The scan control line includes the second scan control line and the 3rd scan control line, the drain/source of the second transistor Pole is connected to data wire;The grid of 4th transistor is connected to the second scan control line;The drain electrode of 5th transistor/ Source electrode is connected to the first power supply, and the grid of the 5th transistor is connected to the 3rd scan control line;6th transistor Grid is connected to the 3rd scan control line;
Transistor in the initialization unit includes the 4th transistor and the 6th transistor, and the source electrode of the 4th transistor/ Drain electrode is connected with the source/drain of the 6th transistor.
It is 4. a kind of such as the driving method of AMOLED pixel cells according to any one of claims 1 to 3, it is characterised in that bag Include:
Initial phase:Initialization unit turns on, and second source is by the transistor in initialization unit to third transistor Grid initializes;
Data write phase:Scan control signal is supplied to the second scan control line, data write unit conducting, by data-signal Corresponding voltage is stored to capacitor;
Glow phase:Scan control signal is supplied to the 3rd scan control line, luminous controling unit conducting, Organic Light Emitting Diode It is luminous.
5. the driving method of AMOLED pixel cells as claimed in claim 4, it is characterised in that in initial phase, scanning Control signal is supplied to the first scan control line and the second scan control line, second source to pass through the first transistor and the 4th crystal Pipe, the grid of third transistor is initialized.
6. the driving method of AMOLED pixel cells as claimed in claim 4, it is characterised in that in initial phase, scanning Control signal is supplied to the first scan control line, and second source is initialized by the first transistor to the grid of third transistor.
7. the driving method of AMOLED pixel cells as claimed in claim 4, it is characterised in that in initial phase, scanning Control signal is supplied to the second scan control line and the 3rd scan control line, and second source passes through the 4th transistor and the 6th crystal Pipe, the grid of third transistor is initialized.
8. the driving method of the AMOLED pixel cells as described in claim 4-7 any claims, it is characterised in that in number According to write phase, scan control signal is supplied to the second scan control line, brilliant by second transistor, third transistor and the 4th Body pipe, voltage corresponding to data-signal is stored to capacitor;In glow phase, scan control signal is supplied to the 3rd scanning control Line processed, lighted by third transistor, the 5th transistor and the 6th transistor, organic light emitting diode.
A kind of 9. AMOLED display device, it is characterised in that including:It is multiple such as according to any one of claims 1 to 3 AMOLED pixel cells, scanner driver and data driver;Multiple AMOLED pixel unit arrays arrangements, each AMOLED pictures Plain unit is connected with the scanner driver, and each AMOLED pixel cells are connected with the data driver.
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