CN104050914B - Pixel-driving circuit, display unit and image element driving method - Google Patents
Pixel-driving circuit, display unit and image element driving method Download PDFInfo
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- CN104050914B CN104050914B CN201410211395.XA CN201410211395A CN104050914B CN 104050914 B CN104050914 B CN 104050914B CN 201410211395 A CN201410211395 A CN 201410211395A CN 104050914 B CN104050914 B CN 104050914B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention provides a kind of pixel-driving circuit, display unit and image element driving method. This pixel-driving circuit comprises holding wire, control line, power subsystem and driver element, also comprises compensating unit, and holding wire, control line, power subsystem and driver element are connected with compensating unit respectively; Power subsystem and driver element are respectively used to light-emitting component power supply is provided and drives; Holding wire and control line are respectively used to provide data-signal and control signal for compensating unit; Compensating unit is for carrying out threshold voltage compensation according to data-signal and control signal to driver element. This pixel-driving circuit is by arranging compensating unit, make the operating current of driver element no longer be subject to the impact of its threshold voltage, thereby eliminate the threshold voltage of driver element to the impact of its operating current, thoroughly solve the problem of the threshold voltage shift that driver element causes due to manufacturing process and long-time operation, and then guaranteed that the display brightness of light-emitting component is even.
Description
Technical field
The present invention relates to Display Technique field, be specifically related to a kind of pixel-driving circuit, demonstrationDevice and image element driving method.
Background technology
OLED (AMOLED) is the focus of current flat-panel monitor research fieldOne of, compared with liquid crystal display (LCD), OLED have low energy consumption, production cost low,The advantages such as self-luminous, wide visual angle and fast response time, at present, in mobile phone, PDA, digital phaseThe demonstration field OLED such as machine have started to replace traditional LCD display. Wherein, pixel is drivenMoving is the core technology content of AMOLED display, has important Research Significance.
Utilize stable Control of Voltage brightness different from TFT-LCD, OLED belongs to current drives,Need stable electric current to control luminous. As shown in Figure 1, traditional AMOLED pixel driverCircuit adopts 2T1C pixel-driving circuit. This circuit only has 1 drive TFT (being T2),A switching TFT (being T1) and a memory capacitance Cs composition. When scan line gating (is sweptRetouch) when certain a line, Vscan is low level signal, T1 conducting, data-signal Vdata writesMemory capacitance Cs, after this line scanning finishes, Vscan becomes high level signal, and T1 turn-offs,The grid voltage being stored on Cs drives T2 pipe, makes its generation current carry out driving OLED, protectsCard OLED continues luminous within a frame shows. Drive TFT (being T2) is in the time reaching capacityCurrent formula is IOLED＝K(VGS-Vth)2。
Due to the reason such as manufacturing process and device aging, the threshold value of the drive TFT of each pixelVoltage (Vth) can drift about, this has just caused the electric current that flows through each OLED pixel because of VthVariation and change; In addition, because the threshold voltage of the drive TFT of each pixel exists unevenEven property, can directly cause the electric current that flows through each pixel OLED to change, and makes to showBrightness disproportionation, thus the display effect of whole image affected.
Summary of the invention
For the above-mentioned technical problem existing in prior art, the invention provides a kind of pixel and driveMoving circuit, display unit and image element driving method. This pixel-driving circuit is single by compensation is setUnit, makes the operating current of driver element no longer be subject to the impact of its threshold voltage, drives thereby eliminatedThe impact of the threshold voltage of moving cell on its operating current, has thoroughly solved driver element due to workThe problem of the threshold voltage shift that skill processing procedure and long-time operation cause, and then guarantee light-emitting componentDisplay brightness even, and promoted the display effect of whole image.
The invention provides a kind of pixel-driving circuit, for light-emitting component is driven; BagDraw together holding wire, control line, power subsystem and driver element, also comprise compensating unit, described letterNumber line, described control line, described power subsystem and described driver element are single with described compensation respectivelyUnit connects;
Described power subsystem and described driver element are respectively used to described light-emitting component that electricity is providedPress and drive, making described light-emitting component luminous;
Described holding wire and described control line are respectively used to provide data letter for described compensating unitNumber and control signal;
Described compensating unit is for driving described according to described data-signal and described control signalMoving cell carries out threshold voltage compensation.
Preferably, described control line comprises the first scan line, the second scan line and the 3rd scanningLine; Described power subsystem comprises the first power end and second source end; Described driver element comprisesDriving tube; Described compensating unit comprises: the first switching tube, second switch pipe, the 3rd switching tube,The 4th switching tube and electric capacity;
The grid of described the first switching tube is connected with described three scan line, described the first switchFirst utmost point of pipe is connected with described the first power end, second utmost point of described the first switching tube respectively withSecond utmost point of described second switch pipe and first utmost point of described driving tube are connected;
The grid of described second switch pipe respectively with described the second scan line and described the 4th switchThe grid of pipe connects, and first utmost point of described second switch pipe is connected with described holding wire, and described theSecond utmost point of two switching tubes is respectively with second utmost point of described the first switching tube and described driving tubeFirst utmost point connects;
The grid of described the 3rd switching tube is connected with described the first scan line, described the 3rd switchFirst utmost point of pipe is connected with described holding wire, second utmost point of described the 3rd switching tube and described electric capacityFirst the utmost point connect;
The grid of described the 4th switching tube respectively with the grid and described of described second switch pipeTwo scan lines connect, first utmost point of described the 4th switching tube respectively with the grid of described driving tube andDescribed electric capacity second the utmost point connect, second utmost point of described the 4th switching tube respectively with described luminous unitFirst utmost point of part and second utmost point of described driving tube are connected; Second utmost point of described light-emitting component and instituteStating second source end connects;
First utmost point of described electric capacity is connected with second utmost point of described the 3rd switching tube, described electric capacitySecond utmost point be connected with the grid of described driving tube and first utmost point of described the 4th switching tube respectively.
Preferably, described compensating unit also comprises the 5th switching tube, described the 5th switching tubeGrid is connected with the grid of described three scan line and described the first switching tube respectively, and the described the 5thFirst utmost point of switching tube respectively with of second utmost point of described driving tube and described the 4th switching tubeTwo utmost points connect, and second utmost point of described the 5th switching tube is connected with first utmost point of described light-emitting component.
Preferably, described the first switching tube, described second switch pipe, described the 3rd switching tube,Described the 4th switching tube, described the 5th switching tube and described driving tube are P type film crystalPipe.
Preferably, in the charging stage of described pixel-driving circuit, described the first scan line andDescribed the second scan line gating, described three scan line turn-offs, described second switch pipe, described inThe 3rd switching tube and described the 4th switching tube are opened, described the first switching tube and described the 5th switchPipe turn-offs, so that the described data-signal that described holding wire provides enters the grid of described driving tubeRow charging, and make the grid of described driving tube obtain the electricity that can compensate its threshold voltagePress.
Preferably, in the driving stage of described pixel-driving circuit, described the first scan line is protectedHold gating, described the second scan line turn-offs, described three scan line gating, described the first switchPipe, described the 3rd switching tube and described the 5th switching tube are opened, described second switch pipe and described inThe 4th switching tube turn-offs, and on described holding wire, is applied with and described charging stage phase in the driving stageSame data-signal.
Preferably, in the driving stage of described pixel-driving circuit, described the first scan line is protectedHold gating, described the second scan line turn-offs, described three scan line gating, described the first switchPipe, described the 3rd switching tube and described the 5th switching tube are opened, described second switch pipe and described inThe 4th switching tube turn-offs, and on described holding wire, is applied with in the described charging stage in the driving stageOn data-signal basis, carry out the data-signal of saltus step.
Preferably, the data-signal of described charging stage and the data-signal of saltus step superimposed afterThe absolute value of data-signal be greater than the absolute value of the data-signal of described charging stage.
Preferably, described the first switching tube, described second switch pipe, described the 3rd switching tube,Described the 4th switching tube, described the 5th switching tube and described driving tube are N-type film crystalPipe.
Preferably, described the first power end provides operating voltage, and described second source end providesReference voltage, described operating voltage is greater than described reference voltage, first utmost point of described light-emitting componentFor positive pole, the second negative pole very of described light-emitting component.
Preferably, described the first power end provides reference voltage, and described second source end providesOperating voltage, described operating voltage is greater than described reference voltage, first utmost point of described light-emitting componentFor negative pole, described light-emitting component second very anodal.
The present invention also provides a kind of display unit, comprises light-emitting component, also comprises above-mentioned pixelDrive circuit, described pixel-driving circuit is connected with described light-emitting component, for to described luminousElement drives.
The present invention also provides a kind of image element driving method, and described image element driving method is by above-mentionedPixel-driving circuit is realized, and described image element driving method comprises:
Described power subsystem under the control of described control line for described light-emitting component provide electricitySource;
Described driver element drives described light-emitting component under the control of described control lineMoving, so that described light-emitting component is luminous;
Described holding wire is believed for described compensating unit provides data under the control of described control lineNumber;
Described compensating unit carries out threshold value to described driver element under the control of described control lineVoltage compensation.
Preferably, in the described charging stage, described compensating unit is in the control of described control lineUnder and according to described data-signal, described driver element is charged;
In the described driving stage, described compensating unit carries out threshold voltage to described driver elementCompensation.
Beneficial effect of the present invention: pixel-driving circuit provided by the present invention, by arrangingCompensating unit, compensating unit can be according to the control on data-signal and control line on holding wireSignal carries out threshold voltage compensation to driver element, makes the operating current of driver element no longer be subject to itThe impact of threshold voltage, thus the threshold voltage of driver element eliminated to the shadow of its operating currentRing, thoroughly solved the threshold voltage that driver element causes due to manufacturing process and long-time operationThe problem of drift, and then guarantee that the display brightness of light-emitting component is even, and promoted whole imageDisplay effect.
Display unit provided by the present invention, by adopting above-mentioned pixel-driving circuit, canMake the display brightness of this display unit more even, thereby promoted the demonstration effect of this display unitReally.
Brief description of the drawings
Fig. 1 is the structural representation of pixel-driving circuit in prior art;
Fig. 2 is the structural representation of pixel-driving circuit in the embodiment of the present invention 1;
Fig. 3 is pixel-driving circuit in Fig. 2 schematic diagram in the charging stage;
Fig. 4 is the driving sequential chart of the pixel-driving circuit in Fig. 2;
Fig. 5 is pixel-driving circuit in Fig. 2 schematic diagram in the stage of driving.
Detailed description of the invention
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with attachedFigure and detailed description of the invention are to a kind of pixel-driving circuit provided by the present invention, display unit and pixelDriving method is described in further detail.
Embodiment 1:
The present embodiment provides a kind of pixel-driving circuit, for light-emitting component is driven,Make light-emitting component luminous; Comprise holding wire, control line, power subsystem and driver element, also bagDraw together compensating unit, holding wire, control line, power subsystem and driver element respectively with compensating unitConnect; Power subsystem and driver element are respectively used to light-emitting component power supply is provided and drivesMoving; Holding wire and control line are respectively used to provide data-signal and control signal for compensating unit;Compensating unit is for carrying out threshold voltage benefit according to data-signal and control signal to driver elementRepay.
As shown in Figure 2, control line comprises the first scan line EM, the second scan line Scan (1)With three scan line Scan (2); Power subsystem comprises the first power end U1 and second source endU2; Driver element comprises driving tube T6; Compensating unit comprises: the first switch transistor T 1, secondSwitch transistor T 2, the 3rd switch transistor T 3, the 4th switch transistor T 4 and capacitor C.
The grid of the first switch transistor T 1 is connected with three scan line Scan (2), the first switching tubeFirst utmost point of T1 is connected with the first power end U1, second utmost point of the first switch transistor T 1 respectively withSecond utmost point of second switch pipe T2 is connected with first utmost point of driving tube T6.
The grid of second switch pipe T2 respectively with the second scan line Scan (1) and the 4th switching tubeThe grid of T4 connects, and first utmost point of second switch pipe T2 is connected with holding wire, second switch pipeSecond utmost point of T2 connects with second utmost point of the first switch transistor T 1 and first utmost point of driving tube T6 respectivelyConnect.
The grid of the 3rd switch transistor T 3 is connected with the first scan line EM, the 3rd switch transistor T 3First utmost point is connected with holding wire, and first utmost point of second utmost point of the 3rd switch transistor T 3 and capacitor C connectsConnect.
The grid of the 4th switch transistor T 4 scans with the grid and second of second switch pipe T2 respectivelyLine Scan (1) connects, first utmost point of the 4th switch transistor T 4 respectively with the grid of driving tube T6 andCapacitor C second the utmost point connect, second utmost point of the 4th switch transistor T 4 respectively with light-emitting component OLEDFirst utmost point and second utmost point of driving tube T6 be connected; Second utmost point and second of light-emitting component OLEDPower end U2 connects.
First utmost point of capacitor C is connected with second utmost point of the 3rd switch transistor T 3, second of capacitor CThe utmost point is connected with the grid of driving tube T6 and first utmost point of the 4th switch transistor T 4 respectively.
In the present embodiment, compensating unit also comprises the 5th switch transistor T 5, the five switch transistor T 5Grid be connected with the grid of three scan line Scan (2) and the first switch transistor T 1 respectively,First utmost point of five switch transistor T 5 is respectively with second utmost point of driving tube T6 and the 4th switch transistor T 4Second utmost point connects, and second utmost point of the 5th switch transistor T 5 is connected with first utmost point of light-emitting component OLED.
Wherein, the first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th are openedClose pipe T4, the 5th switch transistor T 5 and driving tube T6 and be P type thin film transistor (TFT), so energyEnough reduce the manufacturing process of OLED; In addition the control in above-mentioned pixel-driving circuit,Line processed only has three, and the energy consumption that can save this pixel-driving circuit can also reduce circuit simultaneouslyBetween interference.
It should be noted that, in the present embodiment, the first switch transistor T 1, second switch pipe T2,The 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and driving tube T6 also canThink the switching tube (as N-type thin film transistor (TFT)) of the other types with gating switch function alsoThere is same effect. In the time of the gate turn-on of thin film transistor (TFT), its first utmost point and second utmost point itBetween conducting. In the time that the voltage of first utmost point of thin film transistor (TFT) is high, electric current flows to second from first utmost pointThe utmost point; In the time that the voltage of second utmost point of thin film transistor (TFT) is high, electric current flows to first utmost point from second utmost point.
The specific works process of this pixel-driving circuit is: as shown in Figure 3 and Figure 4, and at pictureElement drive circuit charging stage (being also 1 stage in Fig. 4), the first scan line EM andThe second scan line Scan (1) gating, three scan line Scan (2) turn-offs, second switch pipe T2,The 3rd switch transistor T 3 and the 4th switch transistor T 4 are opened, the first switch transistor T 1 and the 5th switching tubeT5 turn-offs, so that the grid (be A point) of the data-signal that holding wire provides to driving tube T6Charge, and make the grid of driving tube T6 obtain the electricity that can compensate its threshold voltagePress.
In this charging stage, holding wire provides data-signal Vdata, make first utmost point of capacitor CB point is reset and is met VdataSignal, if B point electromotive force is Vp, now, second utmost point of capacitor C is AThe electromotive force of point is also Vp，VpCan make driving tube T6 conducting, thereby make A point start charging, fillThe electricity sense of current is along the i1 direction in Fig. 3, until A point is charged to Vp-Vth(this voltage is energyThe voltage that the threshold voltage of driving tube T6 is compensated), now, the pressure reduction that A, B are 2For Vth. In this process, because three scan line Scan (2) turn-offs, so in whole chargingIn process, do not have electric current to pass through light-emitting component OLED (being that light-emitting component OLED can be not luminous),Thereby indirectly reduce the life consumption of light-emitting component OLED.
As shown in Fig. 5 and Fig. 4, (be also in Fig. 4 in the driving stage of pixel-driving circuit2 stages), first scan line EM keep gating, second scan line Scan (1) turn-off,Three scan line Scan (2) gating, the first switch transistor T 1, the 3rd switch transistor T 3 and the 5th are openedClose pipe T5 and open, second switch pipe T2 and the 4th switch transistor T 4 are turn-offed, and on holding wire, are drivingThe data-signal V that the moving stage was applied with in the charging stagedataOn basis, carry out the data letter of saltus stepNumber Δ Vdata。
In this driving stage, first utmost point of capacitor C is that the B electromotive force of ordering is by original VpBecomeVp+ΔVdata, because second utmost point of capacitor C is that A point is floating, therefore to maintain A, B2 original pressure reduction (are Vth), the grid of driving tube T6 is that the electromotive force that A is ordered can occur etc.Press saltus step, A point potential jump is Vp+ΔVdata-Vth; Meanwhile, in this driving stage, driveFirst utmost point of moving pipe T6 accesses the operating voltage V of the first power end U1dd, electric current is along i2'sDirection by the first switch transistor T 1, driving tube T6 and the 5th switch transistor T 5, makes luminous unit successivelyPart OLED starts luminous.
In this driving stage, the data-signal V of charging stagepData-signal Δ V with saltus stepdataData-signal after superimposed is Vp+ΔVdataAbsolute value be greater than the data-signal of charging stageVpAbsolute value. So can guarantee that driving tube T6 thoroughly opened in the driving stage, and inSaturation state so that light-emitting component OLED with show time normal brightness carry out luminous.
Current formula while reaching capacity according to driving tube T6 can obtain:
IOLED＝K(VGS–Vth)2
＝K[Vdd–(Vp+△Vdata–Vth)–Vth]2
＝K(Vdd–Vp–△Vdata)2
In above-mentioned current formula, VGSRefer to gate source voltage when driving tube T6 reaches capacity (The voltage being equivalent between first utmost point and the grid of driving tube T6 is Vdd-(Vp+△Vdata–Vth)。
Derivation result by above-mentioned current formula can find out, in the driving stage, and driving tube T6Operating current IOLEDBe not subject to its threshold voltage VthImpact, only with on holding wire applyData-signal is relevant, thereby the threshold voltage of having eliminated driving tube T6 is to its operating current IOLEDImpact, thoroughly solved the threshold that driving tube T6 causes due to manufacturing process and long-time operationThe problem of threshold voltage drift, and then guarantee that the display brightness of light-emitting component OLED is even, and carryRise the display effect of whole image.
In addition, as can be seen from Figure 4, the compensation of driving tube T6 threshold voltage has only continuedIn two stages (being charging stage 1 and driving stage 2), this has shortened whole pixel driver electricityThe working time on road, can complete expeditiously the driving of whole circuit.
In the present embodiment, the first power end U1 provides operating voltage Vdd, second source end U2Reference voltage V is providedSS, light-emitting component OLED's is first very anodal, light-emitting component OLEDThe second negative pole very. Under normal circumstances, operating voltage Vdd> reference voltage VSS, soCan guarantee that light-emitting component OLED is normally luminous. In the present embodiment, reference voltage VSSFor ground connectionVoltage, thinks reference voltage VSSFor zero potential.
It should be noted that, in above-mentioned pixel-driving circuit, can be also that the first power end is carriedSupply reference voltage, second source end provides operating voltage, the first negative pole very of light-emitting component,Light-emitting component second very anodal. Due to common operating voltage > reference voltage, so electric currentCan flow to from the second source end of high potential the first power end of low potential, therefore, light-emitting componentBoth positive and negative polarity wiring also just in time contrary, in a word, as long as guarantee have electric current to pass through in light-emitting component,Can be luminous.
Embodiment 2:
The present embodiment provides a kind of pixel-driving circuit, as different from Example 1, and at pictureIn the driving stage of element drive circuit, the first scan line keeps gating, and the second scan line turn-offs, theThree scan line gating, the first switching tube, the 3rd switching tube and the 5th switching tube are opened, and second opensClose pipe and the 4th switching tube and turn-off, on holding wire, be applied with identical with the charging stage in the driving stageData-signal.
In this driving stage, the electromotive force of first utmost point of electric capacity is still Vp, correspondingly, driveThe electromotive force of the grid of moving pipe is Vp-Vth, the current formula while reaching capacity according to driving tube is passableObtain:
IOLED＝K(VGS–Vth)2
＝K[Vdd–(Vp–Vth)–Vth]2
＝K(Vdd–Vp)2
Can be found out by above-mentioned current formula, in the present embodiment, at driving stage, driving tubeOperating current IOLEDEqually be not subject to its threshold voltage VthImpact, only with on holding wire executeThe data-signal adding is relevant, thereby the threshold voltage of having eliminated driving tube is to its operating current IOLEDImpact, thoroughly solved the threshold value electricity that driving tube causes due to manufacturing process and long-time operationPress the problem of drift, and then guarantee that the display brightness of light-emitting component is even, and promoted whole figureThe display effect of picture.
In the present embodiment, other structures of pixel-driving circuit are in the same manner as in Example 1, hereinRepeat no more.
The beneficial effect of embodiment 1-2: the pixel-driving circuit in embodiment 1-2, passes throughCompensating unit is set, and compensating unit can be according on the data-signal on holding wire and control lineControl signal was charged to the grid of driving tube in the charging stage, and the grid of driving tube is obtainedThe voltage that can compensate its threshold voltage, carries out threshold voltage in the driving stage to driving tubeCompensation, even if the operating current of driving tube is no longer subject to the impact of its threshold voltage, thereby has eliminatedThe impact of the threshold voltage of driving tube on its operating current, has thoroughly solved driving tube due to techniqueThe problem of the threshold voltage shift that processing procedure and long-time operation cause, and then guarantee light-emitting componentDisplay brightness is even, and has promoted the display effect of whole image.
Embodiment 3:
The present embodiment provides a kind of display unit, comprises light-emitting component, also comprises embodiment 1-2Pixel-driving circuit in arbitrary, pixel-driving circuit is connected with light-emitting component, for to luminousElement drives.
Pixel-driving circuit in arbitrary by employing embodiment 1-2, can make this demonstration dressThe display brightness of putting is more even, thereby has promoted the display effect of this display unit.
Embodiment 4:
The present embodiment provides a kind of image element driving method, and this image element driving method passes through embodimentPixel-driving circuit during 1-2 is arbitrary is realized, and image element driving method comprises: power subsystem is in controlUnder the control of line processed for light-emitting component provides power supply; Driver element under the control of control line to send outOptical element drives, so that light-emitting component is luminous; Holding wire is benefit under the control of control lineRepay unit data-signal is provided; Compensating unit carries out threshold to driver element under the control of control lineThreshold voltage compensation.
In the present embodiment, in the charging stage, compensating unit is under the control of control line and rootAccording to data-signal, driver element is charged; In the driving stage, compensating unit is to driver elementCarry out threshold voltage compensation. This has shortened the time of pixel driver, can complete expeditiously wholeThe driving of individual circuit.
This image element driving method enters driver element under the control of control line by compensating unitRow threshold voltage compensation, makes the operating current of driver element no longer be subject to the impact of its threshold voltage,Thereby eliminate the threshold voltage of driver element to the impact of its operating current, thoroughly solved and drivenThe problem of the threshold voltage shift that moving cell causes due to manufacturing process and long-time operation, and thenThe display brightness of guaranteeing light-emitting component is even, and has promoted the display effect of whole image.
Be understandable that, above embodiment is only used to illustrate principle of the present invention and adoptsIllustrative embodiments, but the present invention is not limited thereto. For the ordinary skill in this areaPersonnel, without departing from the spirit and substance in the present invention, can make various modification andImprove, these modification and improvement are also considered as protection scope of the present invention.
Claims (13)
1. a pixel-driving circuit, for driving light-emitting component; Comprise holding wire,Control line, power subsystem and driver element, is characterized in that, also comprises compensating unit, described inHolding wire, described control line, described power subsystem and described driver element respectively with described compensationUnit connects;
Described power subsystem and described driver element are respectively used to described light-emitting component that electricity is providedPress and drive, making described light-emitting component luminous;
Described holding wire and described control line are respectively used to provide data letter for described compensating unitNumber and control signal;
Described compensating unit is for driving described according to described data-signal and described control signalMoving cell carries out threshold voltage compensation;
Described control line comprises the first scan line, the second scan line and three scan line; DescribedPower subsystem comprises the first power end and second source end; Described driver element comprises driving tube;Described compensating unit comprises: the first switching tube, second switch pipe, the 3rd switching tube, the 4th are openedClose pipe and electric capacity;
The grid of described the first switching tube is connected with described three scan line, described the first switchFirst utmost point of pipe is connected with described the first power end, second utmost point of described the first switching tube respectively withSecond utmost point of described second switch pipe and first utmost point of described driving tube are connected;
The grid of described second switch pipe respectively with described the second scan line and described the 4th switchThe grid of pipe connects, and first utmost point of described second switch pipe is connected with described holding wire, and described theSecond utmost point of two switching tubes is respectively with second utmost point of described the first switching tube and described driving tubeFirst utmost point connects;
The grid of described the 3rd switching tube is connected with described the first scan line, described the 3rd switchFirst utmost point of pipe is connected with described holding wire, second utmost point of described the 3rd switching tube and described electric capacityFirst the utmost point connect;
The grid of described the 4th switching tube respectively with the grid and described of described second switch pipeTwo scan lines connect, first utmost point of described the 4th switching tube respectively with the grid of described driving tube andDescribed electric capacity second the utmost point connect, second utmost point of described the 4th switching tube respectively with described luminous unitFirst utmost point of part and second utmost point of described driving tube are connected; Second utmost point of described light-emitting component and instituteStating second source end connects;
First utmost point of described electric capacity is connected with second utmost point of described the 3rd switching tube, described electric capacitySecond utmost point be connected with the grid of described driving tube and first utmost point of described the 4th switching tube respectively.
2. pixel-driving circuit according to claim 1, is characterized in that, described benefitRepay unit and also comprise the 5th switching tube, the grid of described the 5th switching tube is swept with the described the 3rd respectivelyRetouch line and be connected with the grid of described the first switching tube, first utmost point of described the 5th switching tube respectively withSecond utmost point of described driving tube is connected with second utmost point of described the 4th switching tube, described the 5th switchSecond utmost point of pipe is connected with first utmost point of described light-emitting component.
3. pixel-driving circuit according to claim 2, is characterized in that, describedOne switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, instituteState the 5th switching tube and described driving tube and be P type thin film transistor (TFT).
4. pixel-driving circuit according to claim 3, is characterized in that, describedThe charging stage of pixel-driving circuit, described the first scan line and described the second scan line gating,Described three scan line turn-offs, described second switch pipe, described the 3rd switching tube and the described the 4thSwitching tube is opened, and described the first switching tube and described the 5th switching tube turn-off, so that described signalThe described data-signal that line provides charges to the grid of described driving tube, and makes described drivingThe grid of pipe obtains the voltage that can compensate its threshold voltage.
5. pixel-driving circuit according to claim 4, is characterized in that, describedIn the driving stage of pixel-driving circuit, described the first scan line keeps gating, described the second scanningLine turn-offs, described three scan line gating, described the first switching tube, described the 3rd switching tube andDescribed the 5th switching tube is opened, and described second switch pipe and described the 4th switching tube turn-off, described inOn holding wire, be applied with the data-signal identical with the described charging stage in the driving stage.
6. pixel-driving circuit according to claim 4, is characterized in that, describedIn the driving stage of pixel-driving circuit, described the first scan line keeps gating, described the second scanningLine turn-offs, described three scan line gating, described the first switching tube, described the 3rd switching tube andDescribed the 5th switching tube is opened, and described second switch pipe and described the 4th switching tube turn-off, described inOn holding wire, be applied with on the data-signal basis in the described charging stage and carry out in the driving stageThe data-signal of saltus step.
7. pixel-driving circuit according to claim 6, is characterized in that, described in fillThe absolute value of the data-signal after the electricity data-signal in stage and the data-signal of saltus step are superimposedBe greater than the absolute value of the data-signal of described charging stage.
8. pixel-driving circuit according to claim 2, is characterized in that, describedOne switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, instituteState the 5th switching tube and described driving tube and be N-type thin film transistor (TFT).
9. according to the pixel-driving circuit described in claim 2-8 any one, its feature existsIn, described the first power end provides operating voltage, and described second source end provides reference voltage,Described operating voltage is greater than described reference voltage, described light-emitting component first very anodal, instituteState the second negative pole very of light-emitting component.
10. according to the pixel-driving circuit described in claim 2-8 any one, its featureBe, described the first power end provides reference voltage, and described second source end provides operating voltage,Described operating voltage is greater than described reference voltage, the first negative pole very of described light-emitting component, instituteState the second very anodal of light-emitting component.
11. 1 kinds of display unit, comprise light-emitting component, it is characterized in that, also comprise rightRequire the pixel-driving circuit described in 1-10 any one, described pixel-driving circuit with described inLight-emitting component connects, for described light-emitting component is driven.
12. 1 kinds of image element driving methods, is characterized in that, described image element driving method passes throughPixel-driving circuit described in claim 1-10 any one is realized, described pixel driver sideMethod comprises:
Described power subsystem under the control of described control line for described light-emitting component provide electricitySource;
Described driver element drives described light-emitting component under the control of described control lineMoving, so that described light-emitting component is luminous;
Described holding wire is believed for described compensating unit provides data under the control of described control lineNumber;
Described compensating unit carries out threshold value to described driver element under the control of described control lineVoltage compensation.
13. image element driving methods according to claim 12, is characterized in that, in instituteState the charging stage of pixel-driving circuit, described compensating unit under the control of described control line,And according to described data-signal, described driver element is charged;
In the driving stage of described pixel-driving circuit, described compensating unit is single to described drivingUnit carries out threshold voltage compensation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410211395.XA CN104050914B (en) | 2014-05-19 | 2014-05-19 | Pixel-driving circuit, display unit and image element driving method |
| PCT/CN2014/086491 WO2015176425A1 (en) | 2014-05-19 | 2014-09-15 | Pixel drive circuit, display device, and pixel drive method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410211395.XA CN104050914B (en) | 2014-05-19 | 2014-05-19 | Pixel-driving circuit, display unit and image element driving method |
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| CN104050914A CN104050914A (en) | 2014-09-17 |
| CN104050914B true CN104050914B (en) | 2016-05-18 |
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| CN201410211395.XA Active CN104050914B (en) | 2014-05-19 | 2014-05-19 | Pixel-driving circuit, display unit and image element driving method |
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| WO (1) | WO2015176425A1 (en) |
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| CN104361857A (en) * | 2014-11-04 | 2015-02-18 | 深圳市华星光电技术有限公司 | Pixel driving circuit of organic light-emitting display |
| US9424782B2 (en) * | 2014-12-31 | 2016-08-23 | Lg Display Co., Ltd. | Organic light emitting display |
| CN107591124B (en) * | 2017-09-29 | 2019-10-01 | 上海天马微电子有限公司 | Pixel compensation circuit, organic light emitting display panel and organic light emitting display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006525539A (en) * | 2003-05-02 | 2006-11-09 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Active matrix OLED display with threshold voltage drift compensation |
| CN100373435C (en) * | 2003-09-22 | 2008-03-05 | 统宝光电股份有限公司 | Active array organic light emitting diode pixel driving circuit and driving method thereof |
| US7196682B2 (en) * | 2003-09-29 | 2007-03-27 | Wintek Corporation | Driving apparatus and method for active matrix organic light emitting display |
| KR101209055B1 (en) * | 2005-09-30 | 2012-12-06 | 삼성디스플레이 주식회사 | Display device and driving method thereof |
| KR100902221B1 (en) * | 2008-01-28 | 2009-06-11 | 삼성모바일디스플레이주식회사 | Pixel and organic light emitting display device using same |
| KR101056302B1 (en) * | 2009-03-26 | 2011-08-11 | 삼성모바일디스플레이주식회사 | Organic light emitting display |
| KR101056317B1 (en) * | 2009-04-02 | 2011-08-11 | 삼성모바일디스플레이주식회사 | Pixel and organic light emitting display device using same |
| CN102270425B (en) * | 2010-06-01 | 2013-07-03 | 北京大学深圳研究生院 | Pixel circuit and display device |
| CN101996579A (en) * | 2010-10-26 | 2011-03-30 | 华南理工大学 | Pixel driving circuit and method of active organic electroluminescent display |
| CN202394497U (en) * | 2011-11-15 | 2012-08-22 | 四川虹视显示技术有限公司 | Pixel driving circuit |
| CN102411893B (en) * | 2011-11-15 | 2013-11-13 | 四川虹视显示技术有限公司 | Pixel driving circuit |
| CN102903333B (en) * | 2012-10-25 | 2015-05-06 | 昆山工研院新型平板显示技术中心有限公司 | Pixel circuit of organic light emitting display |
| CN102915703B (en) * | 2012-10-30 | 2014-12-17 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof |
| CN103000134A (en) * | 2012-12-21 | 2013-03-27 | 北京京东方光电科技有限公司 | Pixel circuit, driving method of pixel circuit and display device |
| CN103137071A (en) * | 2013-03-04 | 2013-06-05 | 陈鑫 | Novel active pixel driving circuit with capacity for threshold value compensation |
| CN103474025B (en) * | 2013-09-06 | 2015-07-01 | 京东方科技集团股份有限公司 | Pixel circuit and displayer |
| CN203966515U (en) * | 2014-05-19 | 2014-11-26 | 京东方科技集团股份有限公司 | Pixel-driving circuit and display device |
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2014
- 2014-05-19 CN CN201410211395.XA patent/CN104050914B/en active Active
- 2014-09-15 WO PCT/CN2014/086491 patent/WO2015176425A1/en active Application Filing
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| WO2015176425A1 (en) | 2015-11-26 |
| CN104050914A (en) | 2014-09-17 |
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