CN103295519A - Displayer and pixel driving method - Google Patents
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Abstract
The invention provides a displayer and a pixel driving method. The displayer comprises a pixel driving circuit. The pixel driving circuit comprises a first switching element, a second switching element, a third switching element and a fourth switching element. The first switching element comprises a first terminal, a second terminal and a control terminal. The second terminal is connected to a first node and a light-emitting element in a coupled mode, and the control terminal is connected to a second node in a coupled mode. The second switching element comprises a first terminal, a second terminal and a control terminal, wherein the first terminal is connected to a first signal source in a coupled mode, the second terminal is connected to the first terminal of the first switching element in a coupled mode, and the control terminal is connected to a first scanning signal line in a coupled mode. The third switching element comprises a first terminal, a second terminal and a control terminal, wherein the first terminal is connected to a second signal source in a coupled mode, the second terminal is connected to the second node in a coupled mode, and the control terminal is connected to a second scanning signal line in a coupled mode. The fourth switching element comprises a first terminal, a second terminal and a control terminal, wherein the first terminal is connected to a third node in a coupled mode, the second terminal is connected to a grounding terminal in a coupled mode, and the control terminal is connected to the second scanning signal line in a coupled mode.
Description
Technical field
This exposure is relevant for a kind of display, particularly relevant for a kind of pixel-driving circuit.
Background technology
The pixel of organic light emitting diode display (Organic Light Emitting Display) generally is with thin film transistor (TFT) (Thin Film Transistor, TFT) the collocation storage capacitors stores electric charge, with control Organic Light Emitting Diode (Organic Light Emitting Diode, brightness performance OLED).Please refer to Fig. 1, it is the synoptic diagram of conventional pixel circuit.Image element circuit 100 is to comprise that (N-type) thin film transistor (TFT) 102, storage capacitors 104 are that example explains with Organic Light Emitting Diode 106.The two ends cross-over connection of storage capacitors 104 is between the grid G and source S of thin film transistor (TFT) 102, and its electric capacity cross-pressure is to be denoted as Vgs.The anode of Organic Light Emitting Diode 106 couples the source S of thin film transistor (TFT) 102, and its current potential is denoted as VOLED.Described structure is to flow through the size of current of thin film transistor (TFT) 102 by electric capacity cross-pressure Vgs (also being grid source cross-pressure) control, namely flows through electric current I OLED=K* (Vgs-Vth) ^2 of Organic Light Emitting Diode 106.And electric capacity cross-pressure Vgs is the voltage difference between the current potential VOLED of data-signal Vdata and Organic Light Emitting Diode anode tap.Therefore, the brightness performance by providing different data-signal Vdata just can control light emitting diode 106.
Yet thin film transistor (TFT) 102 can produce the skew (Shift) of critical voltage Vth when practical operation.This side-play amount is relevant with manufacturing process, the running time of thin film transistor (TFT) and the size of current that flows through etc.So to all pixels on the whole display panel, because of the difference of each thin film transistor (TFT) 102 on ON time, conducting electric current and manufacturing process, can cause this a little thin film transistor (TFT)s 102 that drive usefulness, critical voltage side-play amount to each other is all inequality, and then makes the luminosity of each pixel not keep identical corresponding relation with received pixel voltage.So just can make the inhomogeneous phenomenon of picture brightness.Therefore, therefore need a kind of pixel-driving circuit and image element driving method badly, solve the problem of the critical voltage skew of thin film transistor (TFT).
Summary of the invention
In view of this, this exposure provides a kind of display, comprising: a pixel-driving circuit comprises: one first on-off element, and one second end and the control end that have one first end, are coupled to a first node and a light-emitting component are coupled to a Section Point; One second switch element has one first end and is coupled to first end and the control end that one first signal source, one second end be coupled to first on-off element and is coupled to one first scan signal line; One the 3rd on-off element has that one first end is coupled to a secondary signal source, one second end is coupled to Section Point and a control end is coupled to one second scan signal line; One the 4th on-off element has that one first end is coupled to one the 3rd node, one second end is coupled to an earth terminal and a control end is coupled to second scan signal line; One first capacitor is coupled between Section Point and the 3rd node; And one second capacitor, be coupled between first node and the 3rd node.
This exposure also provides a kind of driving pixel method, be applied in the pel array, comprise: when a reset cycle, according to three, four on-off element of second sweep signal by all pixels, and according to the second switch element of first all pixels of sweep signal conducting, make the stored voltage of first, second capacitor pass through the accurate position of first, second on-off element earial drainage to a low-voltage; During a compensation cycle behind reset cycle, impose accurate of the accurate position of one first reference voltage and one second reference voltage respectively at the control end of first on-off element of all pixels and first end, make the on-off element of winning increase the accurate position of voltage quasi position to a compensation of first node according to the accurate position of first reference voltage, wherein the accurate position of second reference voltage is more than or equal to the accurate position of first reference voltage, and the accurate position of compensation subtracts critical voltage for the accurate position of reference voltage; When the data behind compensation cycle are written into the cycle, by the second switch element, make the 3rd on-off element according to second sweep signal accurate position of the reference voltage in secondary signal source is written in first capacitor with corresponding data-signal according to first sweep signal; And when data are written into a light period of all after dates, produce a drive current to light-emitting component by first on-off element according to the stored voltage quasi position of first capacitor, in order to drive light-emitting component.
Display provided by the present invention and driving pixel method can effectively solve the problem of the critical voltage skew of thin film transistor (TFT).
Description of drawings
Fig. 1 is the synoptic diagram of conventional pixel circuit;
Fig. 2 is an embodiment of the pixel-driving circuit of this exposure;
Fig. 3 is sweep signal SS1, the SS2 of this exposure and the sequential chart of signal source PVDD1, PVDD2;
Fig. 4 is another embodiment of the pixel-driving circuit of this exposure;
Fig. 5 is sweep signal SS1, the SS2 of this exposure and the sequential chart of signal source PVDD3;
Fig. 6 is a display panel of this exposure;
Fig. 7 is an electronic installation of this exposure;
Fig. 8 is a process flow diagram of the image element driving method of this exposure;
Fig. 9 is the sequential chart of general gradual driving circuit; And
Figure 10 is the sequential chart of the pixel-driving circuit of this exposure.
Drawing reference numeral:
100: image element circuit;
102: thin film transistor (TFT);
104: storage capacitors;
106: Organic Light Emitting Diode;
Vgs: grid source cross-pressure;
S: source electrode;
D: drain electrode;
G: grid;
IOLED: electric current;
VOLED: current potential;
200,400: pixel-driving circuit;
T1～T4: on-off element;
C1, C2: capacitor;
N1～N3: node;
Scan1, Scan2: scan signal line;
SS1, SS2: sweep signal;
PVDD1, PVDD2, PVDD3: signal source;
D1～D4: first end;
S1～S4: second end;
G1～G4: control end;
ED: light-emitting component;
Vdata: data-signal;
Vth: critical voltage;
Vref: the accurate position of reference voltage;
Vlow, Vss: the accurate position of low-voltage;
VDD, Vdd: the accurate position of high voltage;
Id: drive current;
P1: reset cycle;
P2: compensation cycle;
P3: data are written into the cycle;
P4: light period;
600: display panel;
610: pel array;
620: scanner driver;
630: data driver;
640: the reference signal generator;
700: electronic installation;
710: shell;
720: power supply unit;
SSP: gate switching cycle.
Embodiment
For described and other purposes of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below:
Below explanation is to carry out optimal mode of the present invention.Those skilled in the art should be able to know under the prerequisite that does not break away from spirit of the present invention and framework, when doing a little change, replacement and displacement.Category of the present invention is when deciding with claim.
Fig. 2 is an embodiment of the pixel-driving circuit 200 of this exposure.As shown in Figure 2, pixel-driving circuit 200 makes light-emitting element E D come luminous according to drive current Id in order to produce drive current Id to a light-emitting element E D.In this exposure embodiment, light-emitting element E D be Organic Light Emitting Diode (Organic Light Emitting Diode, OLED).Pixel-driving circuit 200 comprises on-off element T1～T4, capacitor C1～C2.In this exposure embodiment, on-off element T1～T4 can be indium gallium zinc oxide film transistor (InGaZnO thin film transistor, IGZO TFT), but be not limited thereto, the on-off element T1～T4 of this exposure can realize with any N-type thin film transistor (TFT).
Specifically, on-off element T1 has the second end S2, the second end S1 (source electrode) that the first end D1 (drain electrode) is coupled to on-off element T2 and is coupled to a node N2 and a light-emitting element E D and control end G1 (grid) and is coupled to a node N1.On-off element T2 has the first end D2 (drain electrode) and is coupled to the first end D1 and the control end G2 (grid) that a signal source PVDD1, the second end S2 (source electrode) be coupled to on-off element T1 and is coupled to one scan signal wire scan2.On-off element T3 has one first end D3 (drain electrode) and is coupled to that a signal source PVDD2, one second end S3 (source electrode) are coupled to node N1 and a control end G3 (grid) is coupled to one scan signal wire Scan1.On-off element (T4) has one first end D4 (drain electrode) and is coupled to that a node N3, one second end S4 (source electrode) are coupled to an earth terminal and a control end G4 (grid) is coupled to scan signal line scan1.Capacitor C1 is coupled between node N1 and the node N3.Capacitor C2 is coupled between node N2 and the node N3.
Fig. 3 is sweep signal SS1, the SS2 of this exposure and the sequential chart of signal source PVDD1, PVDD2, in order to pixels illustrated driving circuit 200.As Fig. 2 and shown in Figure 3, a picture frame cycle comprises that in regular turn a reset cycle P1, a compensation cycle P2, data are written into cycle P3 and a light period P4.When pixel-driving circuit 200 operates in reset cycle P1, the sweep signal SS2 that scan signal line Scan2 exports is the accurate position of high voltage VDD, and the sweep signal SS1 that scan signal line Scan1 exports is the accurate position of low-voltage Vlow, make on-off element T3, T4 operate in closed condition (cut-off state), on-off element T2 operates in opening (conducting state).Because the last one-period of reset cycle P1 is the cause of light period, capacitor C1 still has the voltage quasi position (for example accurate position of reference voltage Vref+ data-signal Vdata) of last one-period, makes on-off element T1 operate in conducting state at this moment.Because signal source PVDD1, PVDD2 are the accurate position of low-voltage Vlow, therefore on-off element T1 and T2 with the voltage quasi position of node N2 toward signal source PVDD1 (the accurate position of low-voltage) earial drainage to the accurate Vlow of low-voltage, and because the continuous characteristic of electric capacity both end voltage, make the voltage quasi position of node N1 by equivalent coupled (effective coupling) to the accurate position of low-voltage Vlow, therefore on-off element T1 changes cut-off state into by conducting state, and node N1 and N2 all are reset to the accurate position of low-voltage Vlow.In preferred embodiment, the accurate position of the high voltage of SS1 and SS2 can be higher than the height point of PVDD1 and PVDD1 and press accurate position, and the accurate position of the low-voltage of SS1 and SS2 can be lower than the low spot of PVDD1 and PVDD1 and press accurate position.
During compensation cycle P2 behind the reset cycle P1, the accurate position of scan signal line Scan1 and Scan2 output HIGH voltage makes on-off element T2～T4 all operate in conducting state.Signal source PVDD2 is the accurate position of reference voltage Vref, and signal source PVDD1 is the voltage quasi position (for example accurate position of high voltage VDD) that is higher than the accurate position of reference voltage Vref, make on-off element T3 that the voltage quasi position of node N1 is increased to the accurate position of reference voltage Vref, to such an extent as to on-off element T1 by cut-off state change into opening (because Vref＞Vth), and the node N2 that will be the accurate position of low-voltage Vlow originally is increased to accurate an of compensation, and wherein position, the accurate position of compensation is that the accurate position of a reference voltage Vref subtracts critical voltage Vth (being Vref-Vth).Therefore the voltage quasi position difference of node N1 and N2 be on-off element T1 a critical voltage Vth (that is, VN1-VN2=Vth).
It is noted that, (meaning is Vref＜Vth+Voled0) to the accurate position of reference voltage Vref, and (meaning is VDD＞Vret) and suits greater than the voltage quasi position of the accurate Vref of reference voltage and data-signal Vdata that (meaning is VDD＞Vref+Vdata) the accurate position of high voltage VDD greater than the accurate position of reference voltage Vref less than the sum total of the critical voltage Voled0 of critical voltage Vth and light-emitting element E D.
When the data behind compensation cycle P2 are written into cycle P3, sweep signal SS2 changes the accurate position of low-voltage Vlow into by the accurate position of high voltage VDD, make that on-off element T2 is closed condition (turn off state), and on-off element T3 is according to the sweep signal SS1 of scan signal line Scan1, and the accurate position of the reference voltage Vref of signal source PVDD2 is written among the capacitor C1 with corresponding data-signal Vdata.After data-signal Vdata was written into capacitor C1, sweep signal SS1 was the accurate position of low-voltage Vlow, makes on-off element T3 and T4 operate in closed condition.Therefore, after data-signal Vdata was written into capacitor C1, the voltage quasi position of node N2 remained on Vref-Vth, and the voltage quasi position of node N1 is Vref+Vdata.
During light period P4 after data are written into cycle P3, sweep signal SS2 and SS1 are respectively the accurate position of high voltage VDD and the accurate Vlow of low-voltage, make on-off element T3 and T4 operate in closed condition, and on-off element T2 operates in conducting state.Signal source PVDD1 is the accurate position of high voltage VDD, and the voltage quasi position of signal source PVDD2 can be any voltage quasi position.In the embodiment of this exposure, signal source PVDD2 is the accurate position of low-voltage Vlow.Because signal source PVDD1 is the accurate position of high voltage VDD, makes on-off element T1 operate in a state of saturation (saturation state), in order to produce a drive current Id to light-emitting element E D according to the stored voltage quasi position of capacitor C1.Therefore light-emitting element E D just can come luminous according to drive current Id.
Specifically, when light-emitting element E D was conducting state, the voltage quasi position of node N2 changed Voled1 into by Vref-Vth, the critical voltage when wherein Voled1 is conducting state for light-emitting element E D.And because the continuous characteristic of electric capacity both end voltage, so the voltage quasi position of node N1 changes (Vdata+Vref)+(Voled1-(Vref-Vth))=Vdata+Voled1+Vth into by Vdata+Vth.The grid source cross-pressure of on-off element T1 is Vgs=(Vdata+Voled1+Vth)-(Voled1)=(Vdata+Vth).Because grid source cross-pressure Vgs=Vdata+Vth＞Vth of on-off element T1, the source of drawing cross-pressure Vds=VDD-Voled1＞Vgs-Vth of on-off element T1, therefore on-off element T1 operates in state of saturation, and drive current Id is only relevant with the grid voltage of on-off element T1.Drive current Id formula is as described below:
Id＝K(Vgs-Vth)
2
＝K(Voled1+Vdata+Vth-Voled1-Vth)
2
＝K(Vdata)
2
Wherein K is the gain coefficient of on-off element T1.Clearly, when light-emitting element E D is conducting state, the open circuit critical voltage Voled1 of the critical voltage Vth of drive current Id and on-off element T1 and light-emitting element E D is irrelevant, only relevant with data-signal Vdata, therefore pixel-driving circuit 200 can not produce the phenomenon of brightness irregularities because of the critical voltage variation of transistor and light-emitting component.
Fig. 4 is another embodiment of the pixel-driving circuit of this exposure.As shown in Figure 4, pixel-driving circuit 400 is similar to pixel-driving circuit 200, difference is that the first end D3 of on-off element T3 is coupled to the first end D2 of on-off element T2, and the voltage quasi position of signal source PVDD1 and PVDD2 is identical and couple pixel-driving circuit 400 by single data signal line.In other words, the signal source PVDD1 of Fig. 1 and PVDD2 are merged into signal source PVDD3, and a pixel has only single data signal line.
Fig. 5 is sweep signal SS1, the SS2 of this exposure and the sequential chart of signal source PVDD3, in order to pixels illustrated driving circuit 400.The sweep signal SS1 of the sweep signal SS1 of Fig. 5 and the sequential of SS2 and Fig. 3 is identical with the sequential of SS2, and when difference was that pixel-driving circuit 400 operates in reset cycle P1, the voltage quasi position of signal source PVDD3 was the accurate position of low-voltage Vlow.When compensation cycle P2, the voltage quasi position of signal source PVDD3 is that reference voltage is pressed accurate position Vref.When data were written into cycle P3, the voltage quasi position of signal source PVDD3 was that reference voltage presses accurate position Vref to add data-signal Vdata.When light period P4, the voltage quasi position of signal source PVDD3 is the accurate position of high voltage VDD.The method of operating of other elements is (for example explanation of Fig. 3) as previously mentioned, just repeats no more at this.The benefit that signal source PVDD1 and PVDD2 is merged into signal source PVDD3 is to reduce the quantity of data signal line, in order to reduce complexity and the cost of circuit design.
Fig. 6 is a display panel of the present invention.As shown in Figure 6, display panel (also claiming display) 600 comprises a pel array 610, one scan driver 620, a data driver 630 and a reference signal generator 640.For example, pel array 610 comprises a plurality of pixels, each pixel comprise as shown in Figure 2 pixel-driving circuit 200 or pixel-driving circuit 400 shown in Figure 4.
Scanner driver 620 is in order to provide sweep signal to pel array 610, makes the driven or forbidden energy of scan signal line, and data driver 630 is in order to provide the pixel-driving circuit of data-signal to the pel array 610.Reference signal generator 640 is in order to providing the pixel-driving circuit 200 of reference signal to pel array 610 (or pixel-driving circuit 400), and also can be integrated in the scanner driver 620.Be noted that display panel 600 can be an Organic Light Emitting Diode (OLED) display panel, but also can be applicable to the display panel of other kind, for example liquid crystal (LCD) display panel.
In addition, if pel array 610 comprises pixel-driving circuit shown in Figure 2 200, then each row of pel array 610 comprises two different data signal lines, in order to respectively signal source PVDD1 and PVDD2 are coupled to pixel-driving circuit 200.If pel array 610 comprises pixel-driving circuit shown in Figure 4 400, then each row of pel array 610 only need comprise the single scanning signal wire, in order to signal source PVDD3 is coupled to pixel-driving circuit 400.
Figure 7 shows that an electronic installation of the present invention.As shown in the figure, electronic installation 700 is to use display panel shown in Figure 6 600, and this electronic installation 700 for example can be a personal digital assistant (PDA), notebook computer, panel computer, mobile phone, display etc.
Generally speaking, electronic installation 700 comprises a shell 710, a display panel 600 and a power supply unit 720, though electronic installation 700 also contains other element, does not add tired stating in this.In the action, power supply unit 720 makes that in order to supply power to display panel 600 display panel 600 can show image.
Fig. 8 is a process flow diagram of the image element driving method of this exposure, is applicable to pel array 610.As shown in Figure 8, when pel array 610 operates in reset cycle P1, enter step S81, on-off element T3 and T4 by all pixels, and the on-off element T2 of all described pixels of conducting makes the stored voltage of capacitor C1 and C2 pass through on-off element T1 and the accurate position of T2 earial drainage to a low-voltage.During compensation cycle P2 after pel array 610 operates in reset cycle P1, enter step S82, control end G1 and the first end D1 at the on-off element T1 of all pixels impose a reference voltage accurate position Vref and the accurate position of reference voltage Vref1 respectively, make on-off element T1 increase the accurate position of voltage quasi position to a compensation of node N2 according to the accurate position of reference voltage Vref, wherein the accurate position of reference voltage Vref1 is more than or equal to the accurate position of reference voltage Vref, and the accurate position of compensation subtracts critical voltage Vth (Vref-Vth) for the accurate position of reference voltage Vref.Therefore, the control end G1 of on-off element T1 and the voltage quasi position of the second end S1 differ a critical voltage Vth value, and the critical voltage variation Vth that makes the on-off element T1 of all pixels cause is compensated simultaneously.In other words, because step S82 is the critical voltage variation of all on-off element T1 in the synchroballistic pel array 610, so pixel-driving circuit 200 and 400 is synchroballistic formula pixel-driving circuit.
When the data after pel array 610 operates in compensation cycle P2 are written into cycle P3, enter step S83, according to scan signal line Scan2 cutoff switch elements T 2, make the on-off element T3 of all pixels be written among the capacitor C1 according to reference voltage accurate position Vref and the corresponding data-signal Vdata that corresponding sweep signal SS1 exports signal source PVDD2 in regular turn.During light period P4 after pel array 610 operates in data to be written into cycle P3, enter step S84, produce drive current Id synchronously to light-emitting element E D by the on-off element T1 of all pixels according to the stored voltage quasi position of capacitor C1.Therefore, the light-emitting element E D of all pixels is simultaneously shinny according to drive current Id.In other words, pixel-driving circuit 200 and 400 is synchronous light-emitting formula pixel-driving circuit.
Fig. 9 is the general sequential chart of gradual (progressive emission) driving circuit, and Figure 10 is the sequential chart of the pixel-driving circuit of this exposure, and R is the light period of right visual field, and L is the light period of left visual field.As shown in Figure 9, each row light period is approximately less than 4ms, and gate (shutter) switching cycle SSP (whole picture frame is for hiding China ink during the cycle) is approximately 2.5ms.As shown in figure 10, because the pixel-driving circuit of this exposure is synchronous light-emitting (simultaneous emission) formula and synchroballistic formula pixel-driving circuit, so fluorescent lifetime is greater than 4ms, and gate switching cycle SSP is approximately 4ms.Compared to gradual driving circuit, it is longer that the picture frame of the pixel-driving circuit of this exposure hides from view the cycle, and the glasses shutter that therefore is conducive to fast gate-type stereo display glasses switches.
In sum, because display panel 600, the pixel-driving circuit 200 and 400 of this exposure are synchronous light-emitting formula driving circuit, so the more progressive illuminated driving circuit of light period comes longly.In addition because the critical voltage variation of display panel 600 all pixels of synchroballistic of this exposure, so full frame to hide from view more progressive illuminated driving circuit of cycle long, therefore fast gate-type glasses have time enough to switch in deceiving picture.Because the N-type thin film transistor (TFT) is used in this exposures, therefore can use high-res, low power consumption, reaction velocity soon and indium gallium zinc oxide film transistor that color saturation is high drives light-emitting component.In addition, because voltage source of 400 need of pixel-driving circuit of this exposure does not need extra data signal line, therefore reduce complexity and the manufacturing cost of circuit.
More than the feature of the many embodiment of narration makes the person of ordinary skill in the field can know the form of understanding this instructions.The person of ordinary skill in the field can understand its can utilize disclosure of the present invention for the basis with design or change other manufacturing process and structure is finished the purpose that is same as described embodiment and/or reached the advantage that is same as described embodiment.The person of ordinary skill in the field also can understand the equivalent constructions that does not break away from the spirit and scope of the present invention and can change arbitrarily without departing from the spirit and scope of the present invention, substitute and retouching.
Claims (15)
1. a display is characterized in that, described display comprises:
One pixel-driving circuit comprises:
One first on-off element, one second end and the control end that have one first end, are coupled to a first node and a light-emitting component are coupled to a Section Point;
One second switch element has one first end and is coupled to first end and the control end that one first signal source, one second end be coupled to described first on-off element and is coupled to one first scan signal line;
One the 3rd on-off element has that one first end is coupled to a secondary signal source, one second end is coupled to described Section Point and a control end is coupled to one second scan signal line;
One the 4th on-off element has that one first end is coupled to one the 3rd node, one second end is coupled to an earth terminal and a control end is coupled to described second scan signal line;
One first capacitor is coupled between described Section Point and described the 3rd node; And
One second capacitor is coupled between described first node and described the 3rd node.
2. display as claimed in claim 1, it is characterized in that, when a reset cycle, described second switch element operates in conducting state according to one first sweep signal of described first scan signal line, and described the 3rd on-off element, the 4th on-off element operates in cut-off state according to one second sweep signal of described second scan signal line, make described first on-off element, the second switch element is according to described first signal source, the secondary signal source is discharged to the accurate position of described low-voltage with the voltage quasi position of described first node, and described first capacitor, second capacitor is discharged to the accurate position of described low-voltage with described Section Point.
3. display as claimed in claim 2, it is characterized in that, during a compensation cycle behind described reset cycle, described second switch element, the 3rd on-off element and the 4th on-off element are respectively according to described first sweep signal, second sweep signal operates in conducting state, make described the 3rd on-off element increase to the accurate position of described reference voltage and open described first on-off element according to the voltage quasi position of described secondary signal source with described Section Point, so that described first on-off element increases to the accurate position of a compensation according to described first signal source with described first node, the accurate position of wherein said reference voltage is less than the sum total of one second critical voltage of described first critical voltage and described light-emitting component, the accurate position of described high voltage is greater than the accurate position of described reference voltage, and the accurate position of described compensation subtracts described critical voltage for the accurate position of described reference voltage.
4. display as claimed in claim 3, it is characterized in that, when the data behind described compensation cycle are written into the cycle, described second switch element operates in cut-off state according to described first sweep signal, makes described the 3rd on-off element according to described second sweep signal accurate position of the described reference voltage in secondary signal source is written in described first capacitor with corresponding data-signal.
5. display as claimed in claim 4, it is characterized in that, when described data are written into a light period of all after dates, described the 3rd on-off element, the 4th on-off element according to described second sweep signal for operating in cut-off state, described second switch element operates in conducting state according to described first sweep signal, make described first on-off element operate in a state of saturation according to described first signal source, and produce a drive current to described light-emitting component, in order to drive described light-emitting component according to the stored voltage quasi position of described first capacitor.
6. display as claimed in claim 5, it is characterized in that, first end of described the 3rd on-off element is coupled to first end of described second switch element, makes that the voltage quasi position in described first signal source, secondary signal source is identical and couples by single data signal line and described pixel-driving circuit.
7. display as claimed in claim 5 is characterized in that, described first, second signal source is coupled to first end of described second switch element and first end of described the 3rd on-off element respectively by the first different data signal line, second data signal line.
8. display as claimed in claim 1 is characterized in that, described first on-off element, second switch element, the 3rd on-off element and the 4th on-off element are the N-type transistor.
9. the driving pixel method of a display as claimed in claim 1 is characterized in that, described driving pixel method comprises:
When a reset cycle, according to described three on-off element, four on-off element of described second sweep signal by all described pixels, and according to the described second switch element of described first all described pixels of sweep signal conducting, make the stored voltage of described first capacitor, second capacitor by described first on-off element, the accurate position of second switch element earial drainage to a low-voltage;
During a compensation cycle behind described reset cycle, impose accurate of the accurate position of one first reference voltage and one second reference voltage respectively at the control end of described first on-off element of all described pixels and first end, make described first on-off element increase the accurate position of voltage quasi position to a compensation of described first node according to the accurate position of described first reference voltage, the accurate position of wherein said second reference voltage is more than or equal to the accurate position of described first reference voltage, and the accurate position of described compensation subtracts described critical voltage for the accurate position of described reference voltage;
When the data behind described compensation cycle are written into the cycle, by described second switch element, make described the 3rd on-off element according to described second sweep signal accurate position of the described reference voltage in secondary signal source is written in described first capacitor with corresponding data-signal according to described first sweep signal; And
When described data are written into a light period of all after dates, produce a drive current to described light-emitting component, in order to drive described light-emitting component by described first on-off element according to the stored voltage quasi position of described first capacitor.
10. driving pixel method as claimed in claim 9 is characterized in that the step when described reset cycle more comprises:
According to the voltage quasi position of described first node, by described first capacitor, second capacitor with the voltage quasi position equivalent coupled of described Section Point to the accurate position of described low-voltage.
11. driving pixel method as claimed in claim 10 is characterized in that the step when described compensation cycle more comprises:
According to described first, second sweep signal described second switch element of conducting, the 3rd on-off element and the 4th on-off element respectively, make described the 3rd on-off element according to described second sweep signal voltage quasi position of described Section Point be increased to the accurate position of described reference voltage.
12. driving pixel method as claimed in claim 11 is characterized in that, the step during described light period more comprises:
End described the 3rd on-off element, the 4th on-off element according to described second sweep signal; And
According to the described second switch element of the described first sweep signal conducting, make described first on-off element operate in state of saturation according to described first signal source, and produce a drive current to described light-emitting component according to the stored voltage quasi position of described first capacitor.
13. driving pixel method as claimed in claim 12, it is characterized in that, first end of described the 3rd on-off element is coupled to first end of described second switch element, makes described first signal source, secondary signal source couple by identical one first data signal line and described pixel.
14. driving pixel method as claimed in claim 12, it is characterized in that, by the first different data signal line, second data signal line described first signal source, secondary signal source are coupled to first end of described second switch element and first end of described the 3rd on-off element respectively.
15. driving pixel method as claimed in claim 9 is characterized in that described first on-off element, second switch element, the 3rd on-off element and the 4th on-off element are the N-type transistor.
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