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CN101192373B - Organic light emitting display and its organic light emitting pixel with voltage compensation technology - Google Patents

Organic light emitting display and its organic light emitting pixel with voltage compensation technology Download PDF

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Publication number
CN101192373B
CN101192373B CN2006101639535A CN200610163953A CN101192373B CN 101192373 B CN101192373 B CN 101192373B CN 2006101639535 A CN2006101639535 A CN 2006101639535A CN 200610163953 A CN200610163953 A CN 200610163953A CN 101192373 B CN101192373 B CN 101192373B
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film transistor
thin film
voltage
capacitor
coupled
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CN101192373A (en
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曾名骏
郭鸿儒
黄建翔
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Qijing Photoelectric Co ltd
Chi Mei Optoelectronics Corp
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Qijing Photoelectric Co ltd
Chi Mei Optoelectronics Corp
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Abstract

The invention discloses an organic light emitting display and an organic light emitting pixel with a voltage compensation technology. The first thin film transistor receives a first voltage, and a second terminal of the first thin film transistor is coupled to a gate thereof and a first terminal of the first capacitor. The second thin film transistor receives a second voltage, and a gate of the second thin film transistor is coupled to the gate of the first thin film transistor. The third thin film transistor is coupled to the first capacitor and receives a pixel voltage and a scanning signal. The reset circuit sets the first end of the first capacitor to a first voltage level. An anode of the organic light emitting diode is coupled to the second terminal of the second thin film transistor, and a cathode of the organic light emitting diode receives the third voltage. The compensation speed of the temporary voltage can be improved, and the defect of uneven picture display of the existing organic light-emitting display can be overcome.

Description

OLED and have the organic light emission pixel of voltage compensation technology
Technical field
The invention relates to a kind of OLED, and particularly relevant for OLED and have the organic light emission pixel of voltage compensation technology.
Background technology
The pixel of OLED (Organic Light Emitting Display) is generally with a thin film transistor (TFT) (Thin Film Transistor; TFT) collocation electric capacity comes storage assembly; With control Organic Light Emitting Diode (Organic Light Emitting Diode, brightness performance OLED).Yet above-mentioned thin film transistor (TFT) can produce critical voltage (Threshold Voltage, skew Vth) (shift) after long-time the use.This side-play amount and thin film transistor (TFT) running time and the size of current that is flow through are relevant.
In procedure for displaying, owing to be used for driving the thin film transistor (TFT) of Organic Light Emitting Diode in each pixel, the electric current during its conducting all is not quite similar.So that the thin film transistor (TFT) critical voltage side-play amount to each other that can cause these to drive usefulness is all inequality.Therefore, make the luminosity of each pixel not keep identical corresponding relation with received pixel data.So just, can make the uneven phenomenon of display frame.
In order to address the above problem, traditional organic light emission pixel has been used a kind of voltage compensation technology.Please with reference to Fig. 1, it is the circuit diagram of traditional organic light emission pixel.Organic light emission pixel 100 comprises thin film transistor (TFT) MP1, MP2, MP3, MP4, MP5, storage capacitors Cst and Organic Light Emitting Diode OLED.Thin film transistor (TFT) MP3 is controlled by sweep signal Scan.Thin film transistor (TFT) MP1 bridges between thin film transistor (TFT) MP3 and storage capacitors Cst.It is shinny that thin film transistor (TFT) MP2 drives Organic Light Emitting Diode OLED according to the capacitance voltage of storage capacitors Cst when the thin film transistor (TFT) MP4 conducting.Thin film transistor (TFT) MP5 is controlled by reset signal Rst.Thin film transistor (TFT) MP4 is controlled by enable signal Enb.
Tradition organic light emission pixel 100 is utilized the critical voltage Vth2 of the thin film transistor (TFT) MP1 payment thin film transistor (TFT) MP2 identical with thin film transistor (TFT) MP2 element characteristic when writing pixel data Data.Further, thin film transistor (TFT) MP3 conducting when sweep signal Scan activation makes pixel data Data charge to storage capacitors Cst via thin film transistor (TFT) MP3 and MP1.The voltage compensation characteristic of thin film transistor (TFT) MP1 utilization simultaneously itself makes X point current potential (being the grid potential of thin film transistor (TFT) MP2) than the low voltage level of Y point current potential (being the critical voltage Vth1 of thin film transistor (TFT) MP1), and then makes the source electrode of thin film transistor (TFT) MP2 and gate terminal voltage difference increase Vth1.Corresponding to critical voltage Vth2, critical voltage Vth1 (its size is equal to critical voltage Vth2 in fact) makes the source electrode of thin film transistor (TFT) MP2 and the voltage difference between grid just be equal to Vdd and pixel voltage Vdata voltage difference.Further, make electric current I through Organic Light Emitting Diode OLED OLEDBe relevant to pixel voltage Vdata exactly.
In above-mentioned compensation technique, be do voltage compensation in the data write phase action to remove the error that critical voltage Vth2 is produced.Yet in that oled panel is towards the epoch of high-res and large-sized application development now, the data write time will significantly reduce.But its not die of electric current needs the long make-up time during thin film transistor (TFT) MP1 conducting, so will make thin film transistor (TFT) MP1 possibly can't normally operate and cause the compensation mechanism inefficacy.From another point of view; In traditional its circuit design of bucking voltage technology; The current potential of nodes X, Y must guarantee all to reach steady state (SS) in the stage of " data write " in advance, otherwise when picture shows the stage, has the problem (charges haring issue) that electric charge is shared.But the conventional voltage compensation technique possibly not have to arrive the state of the stable Vth2 of counteracting owing to deficiency of time has caused nodes X.Therefore under this state, thin film transistor (TFT) MP1 remains the situation of conducting, electric charge has taken place shared and make display brightness can't reach the desired display brightness of pixel voltage Vdata.
Summary of the invention
In view of this, the object of the invention is exactly to be the organic light emission pixel that a kind of OLED is provided and has voltage compensation technology, faces voltage compensation speed in order to improvement.
According to the object of the invention; A kind of driving method of pixel is proposed; Be characterized in; This pixel has one first electric capacity, a first film transistor, one second thin film transistor (TFT) and an Organic Light Emitting Diode, and one first end of this first electric capacity couples the grid of this second film transistor, and transistorized one first termination of this first film is received one first voltage; Transistorized one second end of this first film is coupled to this first end of the transistorized grid of this first film and this first electric capacity; One first termination of this second thin film transistor (TFT) is received one second voltage, and one second end of this second thin film transistor (TFT) is in order to export the anode of a pixel current to this Organic Light Emitting Diode, and the negative electrode of this Organic Light Emitting Diode receives a tertiary voltage.This driving method comprises: by this Organic Light Emitting Diode; In this Organic Light Emitting Diode between the off period; One the 4th voltage this first end in this first electric capacity is provided; And one second end of one the 5th voltage in this first electric capacity, this first film transistor turns of voltage official post between the 4th voltage and this first voltage be provided; Between the off period and the voltage level of this second end of this first electric capacity when remaining on the 5th voltage, remove the 4th voltage in this Organic Light Emitting Diode so that the voltage level of this first end of this first electric capacity is changed into one first voltage level because of the effect of this second thin film transistor (TFT); Between the off period and after the voltage level of this first end of this first electric capacity rises to this first voltage level, change this second end that a pixel voltage to this first electric capacity is provided in this Organic Light Emitting Diode; And this Organic Light Emitting Diode of conducting is so that the 3rd thin film transistor (TFT) is exported this pixel current to this Organic Light Emitting Diode according to the voltage level of this first end of this first electric capacity.
According to the object of the invention; Propose a kind of organic light emission pixel, comprise first electric capacity, the first film transistor, second thin film transistor (TFT), the 3rd thin film transistor (TFT), reset circuit and Organic Light Emitting Diode with OLED of voltage compensation technology.The first film transistor receives first voltage, and transistorized second end of the first film is coupled to grid of itself and first end of first electric capacity.Second thin film transistor (TFT) receives second voltage, and the grid of second thin film transistor (TFT) is coupled to the transistorized grid of the first film.The 3rd thin film transistor (TFT) is coupled to first electric capacity, and receives a pixel voltage and one scan signal.First end that reset circuit is set first electric capacity is first voltage level.The anode idol of Organic Light Emitting Diode is connected to second end of second thin film transistor (TFT), and the negative electrode of Organic Light Emitting Diode receives tertiary voltage.Wherein, first voltage level is lower than the voltage level of first voltage.
According to the object of the invention, a kind of OLED also is provided, be characterized in that comprise: at least one pixel comprises: one first electric capacity; One the first film transistor, transistorized one first termination of this first film is received one first voltage, and transistorized one second end of this first film is coupled to one first end of the transistorized grid of this first film and this first electric capacity; One second thin film transistor (TFT), one first termination of this second thin film transistor (TFT) is received one second voltage, and the grid of this second thin film transistor (TFT) is coupled to the transistorized grid of this first film; One the 3rd thin film transistor (TFT), one first termination of the 3rd thin film transistor (TFT) is received a pixel voltage, and one second end of the 3rd thin film transistor (TFT) is coupled to one second end of this first electric capacity, and the grid of the 3rd thin film transistor (TFT) is in order to receive the one scan signal; One reset circuit is one first voltage level in order to this first end of setting this first electric capacity; And an Organic Light Emitting Diode, the anode idol of this Organic Light Emitting Diode is connected to one second end of this second thin film transistor (TFT), and the negative electrode of this Organic Light Emitting Diode receives a tertiary voltage; And a driver element, in order to drive this pixel, this driver element comprises: a data drive circuit, in order to export this pixel voltage; Scan driving circuit is in order to export this sweep signal; And a sequential control circuit, be this first voltage level in order to this first end of controlling this this first electric capacity of reset circuit setting; Wherein, this first voltage level is lower than the voltage level of this first voltage, and this driving circuit is more in order to provide this first voltage, this second voltage and this tertiary voltage.
For letting above-mentioned purpose of the present invention, characteristic and the advantage can be more obviously understandable, below specially lift a preferred embodiment, and cooperate appended graphicly, elaborate.
Description of drawings
It is a kind of internal circuit diagram with organic light emission pixel of conventional voltage compensation technique that Fig. 1 illustrates.
It is the internal circuit diagram according to the organic light emission pixel with voltage compensation technology of first embodiment of the invention that Fig. 2 illustrates.
It is the sequential chart according to the organic light emission pixel of first embodiment of the invention that Fig. 3 illustrates.
Fig. 4 is a kind of embodiment of reset circuit among Fig. 2.
Fig. 5 is the another kind of embodiment of reset circuit among Fig. 2.
It is according to first embodiment of the invention that Fig. 6 illustrates, the internal circuit diagram with organic light emission pixel of second storage capacitors.
Fig. 7 is a kind of embodiment of the 5th thin film transistor (TFT) among Fig. 2.
Fig. 8 is the another kind of embodiment of the 5th thin film transistor (TFT) among Fig. 2.
Fig. 9 is another embodiment of the 5th thin film transistor (TFT) among Fig. 2.
It is the internal circuit diagram according to the organic light emission pixel with voltage compensation technology of second embodiment of the invention that Figure 10 illustrates.
It is the sequential chart according to the organic light emission pixel of second embodiment of the invention that Figure 11 illustrates.
Figure 12 is a kind of embodiment example of reset circuit among Figure 10.
Figure 13 is the another kind of embodiment example of reset circuit among Figure 10.
It is according to second embodiment of the invention that Figure 14 illustrates, the internal circuit diagram with organic light emission pixel of second storage capacitors.
Figure 15 is a kind of embodiment of the 5th thin film transistor (TFT) among Figure 10.
Figure 16 is the another kind of embodiment of the 5th thin film transistor (TFT) among Figure 10.
Figure 17 is another embodiment of the 5th thin film transistor (TFT) among Figure 10.
The main element symbol description is following among the figure:
100,202,702,802,902,1020,1402,1502,1602,1702: the organic light emission pixel;
200,700,800,900,1000,1400,1500,1600,1700: OLED;
201,701,801,901,1001,1401,1501,1601,1701: driver element;
204,704,804,904,1004,1404,1504,1604,1704: data drive circuit;
206,706,806,906,1006,1406,1506,1606,1706: scan drive circuit
208,708,808,908,1008,1408,1508,1608,1708: sequential control circuit;
210,710,810,910,1010,1410,1510,1610,1710: reset circuit;
MP1, MP2, MP3, MP4, MP5: thin film transistor (TFT);
T1, T2, T3, T4, T5: thin film transistor (TFT);
Cst, C1, C2: storage capacitors;
OLED: Organic Light Emitting Diode.
Embodiment
The present invention proposes a kind of OLED and has the organic light emission pixel of voltage compensation technology, faces voltage compensation speed in order to improvement.
First embodiment
Please with reference to Fig. 2, it is the synoptic diagram of the OLED of first embodiment of the invention.OLED 200 comprises driver element 201 and organic light emission pixel 202.Driver element 201 is in order to driving pixels 202, and it comprises data drive circuit 204, scan drive circuit 206 and sequential control circuit 208.To export the 5th voltage to organic light emission pixel 202, wherein, the 5th voltage is pixel voltage Vdata or low level voltage Preset to data drive circuit 204 according to image data.Scan drive circuit 206 is in order to output scanning signal Scan.Sequential control circuit 208 is in order to export the first control signal Enb to the, four thin film transistor (TFT) T4, also in order to export the second control signal Rst to reset circuit 210.Driver element 201 also provides the first voltage Lock, the second voltage Vdd, tertiary voltage Vss and the 4th voltage INI.Organic light emission pixel 202 comprises first capacitor C 1, the first film transistor T 1, the second thin film transistor (TFT) T2, the 3rd thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4, reset circuit 210 and Organic Light Emitting Diode OLED.Thin film transistor (TFT) T1, T2, T3 and T4 are example with PMOS, are drawn among Fig. 2.
Plain voltage Vdata of the first termination reproduced image of the 3rd thin film transistor (TFT) T3 or low level voltage Preset, its second end are coupled to second end (be among Fig. 2 indicated node Y1) of first capacitor C 1, and its grid is in order to receive sweep signal Scan.One first termination of the first film transistor T 1 is received the first voltage Lock, and one of which second end and grid couple and be coupled to one first end (be among Fig. 2 indicated nodes X 1) of first capacitor C 1.One first termination of the second thin film transistor (TFT) T2 is received the second voltage Vdd.The grid of the second thin film transistor (TFT) T2 is coupled to the grid of the first film transistor T 1.One first end of the 4th thin film transistor (TFT) T4 couples one second end of the second thin film transistor (TFT) T2, and one second end of the 4th thin film transistor (TFT) T4 is coupled to the anode of Organic Light Emitting Diode OLED.The grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The negative electrode of Organic Light Emitting Diode OLED receives tertiary voltage Vss.Reset circuit 210 is the first voltage level V1 in order to first end (being nodes X 1) of setting first capacitor C 1, and it is made up of the 5th thin film transistor (TFT) T5.The 5th thin film transistor (TFT) T5 for example is PMOS, and its first end is coupled to the first end X1 of first capacitor C 1, and second termination is received the 4th voltage INI and its grid receives the second control signal Rst.What wherein, need pay special attention to is the voltage level that the above-mentioned first voltage level V1 is lower than the first voltage Lock.
Please with reference to Fig. 3, it is the sequential chart of the organic light emission pixel of first embodiment of the invention.At zeroth order section 0Stage when (promptly showing last picture); The voltage level of sweep signal Scan ends the 3rd thin film transistor (TFT) T3; The voltage level of the second control signal Rst makes the 5th thin film transistor (TFT) T5 end, and the voltage level of the first control signal Enb makes the 4th thin film transistor (TFT) T4 conducting.So the voltage of node Y1 is the pixel voltage Vdata ' of last picture, and the voltage of nodes X 1 is the voltage X ' of last picture.The voltage X ' of nodes X 1 is greater than first voltage.The first voltage Lock makes the first film transistor T 1 end, and voltage X ' also makes the second thin film transistor (TFT) T2 conducting and produces electric current I simultaneously OLEDElectric current I OLEDBe Kp* (Vsg-Vtp2) 2Vsg is the voltage difference between the second thin film transistor (TFT) T2 grid and source electrode, and it is Vdd-X '.Vtp2 is the critical voltage (Threshold Voltage) of the second thin film transistor (TFT) T2.Electric current I OLEDIt is shinny to see through the 4th thin film transistor (TFT) T4 driving Organic Light Emitting Diode OLED.
Then; When phase one I Stage; The voltage level of the second control signal Rst changes into the 5th thin film transistor (TFT) T5 conducting, the voltage level of sweep signal Scan to make the 3rd thin film transistor (TFT) T3 conducting, and the first control signal Enb changes into the 4th thin film transistor (TFT) T4 is ended.At this moment, data drive circuit 204 provides a low level voltage Preset.The 3rd thin film transistor (TFT) T3 that low level voltage Preset sees through conducting makes the voltage of node Y1 be preset low level voltage Preset, and for example-1～0 volt, and the voltage of nodes X 1 is the 4th voltage INI because of the 5th thin film transistor (TFT) T5 conducting.In this stage, by low level voltage Preset and the 4th voltage INI first capacitor C 1 of resetting.
When subordinate phase II Stage, the voltage level of the second control signal Rst changes into ends the 5th thin film transistor (TFT) T5, and the sweep signal Scan and the first control signal Enb still keep the voltage level of previous stage.So the 3rd thin film transistor (TFT) T3 still is a conducting state, the 4th thin film transistor (TFT) T4 is still for ending.At this moment, the voltage of node Y1 still is low level voltage Preset, and the voltage of nodes X 1 is because the 5th thin film transistor (TFT) T5 is the second voltage level V2 by rising to the effect of the first film transistor T 1.The second voltage level V2 is the critical voltage Vtp1 that the first voltage Lock deducts the first film transistor T 1.
During phase III III Stage (data write phase), the voltage level of the first control signal Enb changes into makes the 4th thin film transistor (TFT) T4 conducting, and the second control signal Rst still keeps with subordinate phase identical with the voltage level of sweep signal Scan.This moment, data drive circuit 204 changed output pixel voltage Vdata.It is pixel voltage Vdata that the 3rd thin film transistor (TFT) T3 that pixel voltage Vdata sees through conducting makes the voltage of node Y1.And the voltage of nodes X 1 has also been brought up to Lock-Vtp1+Vdata-Preset via the effect of first capacitor C 1, thereby makes the first film transistor T 1 end.At this moment, be the current potential that the second voltage Vdd deducts nodes X 1 at grid and the voltage difference Vsg between source electrode of the second thin film transistor (TFT) T2, i.e. Vdd-(Lock-Vtp1+Vdata-Preset).This stage focuses on, because of the 4th thin film transistor (TFT) T4 conducting makes the second thin film transistor (TFT) T2 produce corresponding conducting electric current I corresponding to the voltage difference Vsg between grid and source electrode OLEDThe conducting electric current I OLED=Kp* (Vsg-Vtp2) 2Voltage difference Vsg between grid and source electrode is Vdd-(Lock-Vtp1+Vdata-Preset.So electric current I OLED=Kp* (Vdd-(Lock-Vtp1+Vdata-Preset)-Vtp2) 2So, be similar to Vtp2 because of Vtp1 again.So, electric current I OLEDCan be regarded as Kp* (Vdd-Lock-Vdata+Preset) 2Organic Light Emitting Diode is corresponding to this electric current I OLEDProduce corresponding brightness.
(show the existing picture stage) during stage IV Stage; Make except the voltage level of sweep signal Scan changes into this moment the 3rd thin film transistor (TFT) T3 by and no longer import pixel potential into, other each element operation situations and node voltage all are same as phase III IIIStage.
From the above; When the subordinate phase II Stage, image element circuit 202 has been accomplished the action of critical voltage Vtp2 compensation, thus avoided old technology in; The thin film transistor (TFT) of former responsible critical voltage compensating movement; Be the thin film transistor (TFT) MP1 among Fig. 1, make that because the conducting electric current is faint the speed of compensation mechanism is slower, cause at the stable yet completion voltage compensation of data write phase to have caused electric charge to be shared.And then make data voltage and picture brightness that the awkward situation of error to a certain degree arranged.On the other hand,, also can quicken the running of compensation mechanism, improve the time of compensation by the control of first voltage Lock size.And because element that this instance comprised is less, so be fit to the application of small size panel, like handheld device etc.
In addition, above-mentioned reset circuit 210 also can be realized by the different circuits structure.As shown in Figure 4, it is the circuit diagram of an example of reset circuit.Reset circuit 210 ' is made up of the 5th thin film transistor (TFT) T5; Wherein first end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1, and its second end is coupled to the grid of the 5th thin film transistor (TFT) T5 and receives the second control signal Rst.Perhaps, also can be as shown in Figure 5, it is another routine circuit diagram of reset circuit.Reset circuit 210 " also constitute by the 5th thin film transistor (TFT) T5.So, first end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1, and its second end is coupled to the other end of first capacitor C 1, and its grid then receives the second control signal Rst.
And organic light emission pixel 202 also can couple one second capacitor C 2 more, and is as shown in Figure 6, and in the organic light emission pixel 202, first end of second capacitor C 2 is coupled to node Y1, and the other end of second capacitor C 2 receives the second voltage Vdd.Second capacitor C 2 can be used to help to keep the stable of voltage difference between nodes X 1 and node Y1.
Except that this, above-mentioned the 4th thin film transistor (TFT) T4 is in order to Control current I OLEDWhether flow to Organic Light Emitting Diode OLED, its allocation position is except as shown in Figure 2, and the allocation position of the 4th thin film transistor (TFT) T4 also can be as shown in Figure 7.Fig. 7 is the synoptic diagram of the second routine OLED of present embodiment.In the organic light emission pixel 702; The 4th thin film transistor (TFT) T4 is configurable between the second voltage Vdd and the second thin film transistor (TFT) T2; Promptly first termination of the 4th thin film transistor (TFT) T4 is received the second voltage Vdd; Second end of the 4th thin film transistor (TFT) T4 is coupled to first end (being source electrode) of the second thin film transistor (TFT) T2, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
Perhaps, but also bridge joint outer in the organic light emission pixel of the 4th thin film transistor (TFT) T4 with Control current I OLEDWhether flow to Organic Light Emitting Diode OLED.As shown in Figure 8, it is the synoptic diagram of the 3rd routine OLED of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 802 outsides; Promptly first end of the 4th thin film transistor (TFT) T4 is coupled to the negative electrode of Organic Light Emitting Diode OLED; Second end of the 4th thin film transistor (TFT) T4 is coupled to tertiary voltage Vss, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The 4th thin film transistor (TFT) T4 bridge joint also can be between the second voltage Vdd and the second thin film transistor (TFT) T2 in the outer position of organic light emission pixel.As shown in Figure 9, it is the synoptic diagram of the 4th routine OLED of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 902 outsides; First end of the 4th thin film transistor (TFT) T4 is coupled to first end of the second thin film transistor (TFT) T2; Second end of the 4th thin film transistor (TFT) T4 is coupled to the first voltage Vdd, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
Second embodiment
The place that this enforcement is different from first embodiment is the structure of reset circuit.Reset circuit changes the two ends of being formed and be electrically connected at respectively first electric capacity by two thin film transistor (TFT)s, to be used for first electric capacity and the current potential of setting on the nodes X 1 of resetting.
Please with reference to Figure 10, it is the synoptic diagram of the OLED of second embodiment of the invention.OLED 1000 also comprises driver element 1001 and organic light emission pixel 1002.1001 of driver elements comprise data drive circuit 1004, scan drive circuit 1006 and time schedule controller 1008.And organic light emission pixel 1002 also comprises first capacitor C 1, the first film transistor T 1, the second thin film transistor (TFT) T2, the 3rd thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4, reset circuit 1010 and Organic Light Emitting Diode OLED.Thin film transistor (TFT) T1, T2, T3 and T4 are example with PMOS, are drawn among Figure 10.The structure of OLED 1000 as the structure shown in first embodiment, in this just no longer stating more.
What so need pay special attention to is that reset circuit 1010 is made up of one the 5th thin film transistor (TFT) T5 and one the 6th thin film transistor (TFT) T6.The 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6 for example are PMOS.First end of the 5th thin film transistor (TFT) T5 is coupled to one first end (being nodes X 1) of first capacitor C 1, and second termination is received the 4th voltage INI and its grid receives the second control signal Rst1; First end of the 6th thin film transistor (TFT) is coupled to one second end (being node Y1) of first capacitor C 1, and second end also receives the 4th voltage INI and its grid receives the 3rd control signal Rst2.Wherein, the first voltage level V1 is lower than the voltage level of the first voltage Lock.
Please with reference to Figure 11, it is the sequential chart of the organic light emission pixel of second embodiment of the invention.At zeroth order section 0Stage ' when (showing last picture); The output voltage position of sweep signal Scan is accurate to end the 3rd thin film transistor (TFT) T3, and the voltage level of the second control signal Rst1 and the 3rd control signal Rst2 all ends the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6.So the voltage of node Y1 is the pixel voltage Vdata ' of last picture, and the voltage of nodes X 1 is the voltage X ' of last pixel.The voltage X ' of nodes X 1 makes the first film transistor T 1 end greater than the first voltage Lock, and voltage X ' also makes the second thin film transistor (TFT) T2 conducting and produces electric current I simultaneously OLEDElectric current I OLEDFor Kp* (Vdd-Y '-Vtp2) 2Vsg is the voltage difference between the second thin film transistor (TFT) T2 grid and source electrode, and it is Vdd-Y '.Vtp2 is the critical voltage (Threshold Voltage) of the second thin film transistor (TFT) T2.Electric current I OLEDIt is shinny to see through the 4th thin film transistor (TFT) T4 driving Organic Light Emitting Diode OLED.
Then; When phase one IStage '; The voltage level of sweep signal Scan changes into ends the 3rd thin film transistor (TFT) T3, and the voltage level of the second control signal Rst1 and the 3rd control signal Rst2 changes into and makes the 5th thin film transistor (TFT) T5 and the equal conducting of the 6th thin film transistor (TFT) T6.So this moment, the voltage of nodes X 1 and node Y1 was the 4th voltage INI, for example be-2V～-1V.In this stage, by the 4th voltage INI first capacitor C 1 of resetting.
When subordinate phase II Stage '; The voltage level of the second control signal Rst1 transfers to ends the 5th thin film transistor (TFT) T5, and that the voltage level of the first control signal Enb, sweep signal Scan and the 3rd control signal Rst2 is still kept is identical with phase one IStage '.So this moment, the voltage of node Y1 still was INI, and the voltage of nodes X 1 has risen to the second voltage level V2 because the 5th thin film transistor (TFT) T5 ends with the effect of the first film transistor T 1.The second voltage level V2 is the critical voltage Vtp1 that the first voltage Lock deducts the first film transistor T 1.In other words, this stage uses so that the voltage level of the first end X1 of first capacitor C 1 is Lock-Vtp1.
During phase III III Stage ' (data write phase); The voltage level of the first control signal Enb changes into makes the 4th thin film transistor (TFT) T4 conducting; The voltage level of the 3rd control signal Rst2 changes into ends the 6th thin film transistor (TFT) T6; Sweep signal Scan voltage level changes into makes the 3rd thin film transistor (TFT) T3 conducting, and the second control signal Rst1 still keeps voltage level originally.This moment, data drive circuit 1004 changed output pixel voltage Vdata.It is pixel voltage Vdata that the 3rd thin film transistor (TFT) T3 that pixel voltage Vdata sees through conducting makes the voltage of node Y1.And the voltage of nodes X 1 has also been brought up to Lock-Vtp1+Vdata-INI via the effect of first capacitor C 1, thereby makes the first film transistor T 1 end.At this moment, be the current potential that the second voltage Vdd deducts nodes X 1 at grid and the voltage difference Vsg between source electrode of the second thin film transistor (TFT) T2, i.e. Vdd-(Lock-Vtp1+Vdata-INI).On, so Vsg-Vtp=Vdd-(Lock-Vtp+Vdata-INI)-Vtp=Vdd-Lock-Vdata+INI is electric current I OLED=Kp* (Vdd-(Lock-Vtp1+Vdata-INI)-Vtp2) 2So, be similar to Vtp2 because of Vtp1 again.So, electric current I OLEDCan be regarded as Kp* (Vdd-Lock-Vdata+INI) 2Organic Light Emitting Diode is corresponding to this electric current I OLEDProduce corresponding brightness.
During stage IV Stage ' (picture shows the stage); Make except the voltage level of sweep signal Scan changes into this moment the 3rd thin film transistor (TFT) T3 by and no longer import pixel potential into, other each element operation situations and node voltage all are same as phase III III Stage '.
From the above; When the subordinate phase II Stage ', image element circuit 1002 has been accomplished the action of critical voltage Vtp2 compensation, thus avoided old technology in; The thin film transistor (TFT) of former responsible critical voltage compensating movement; Be the thin film transistor (TFT) MP1 among Fig. 1, make that because the conducting electric current is faint the speed of compensation mechanism is slower, cause at the stable yet completion voltage compensation of data write phase to have caused electric charge to be shared.And then make data voltage and picture brightness that the awkward situation of error to a certain degree arranged.On the other hand,, also can quicken the running of compensation mechanism, improve the time of compensation by the control of first voltage Lock size.And because element that this instance comprised is more, so be fit to the application of large size panel, like display device etc.
In addition, above-mentioned reset circuit 1010 also can be realized by different circuits.Shown in figure 12, it is the circuit diagram of an example of reset circuit.Reset circuit 1010 ' is made up of the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6; Wherein first end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1; Its second termination is received the 4th voltage INI; The grid of the 5th thin film transistor (TFT) T5 receives the second control signal Rst1; First end of the 6th thin film transistor (TFT) T6 is coupled to second end (being node Y1) of first capacitor C 1, and its second end is coupled to second end of the 5th thin film transistor (TFT) T5, and the grid of the 6th thin film transistor (TFT) T6 receives the 3rd control signal Rst2.Perhaps, also can be shown in figure 13, it is another routine circuit diagram of reset circuit.Reset circuit 1010 " also constitute by the 5th thin film transistor (TFT) T5 and the 6th thin film transistor (TFT) T6.So; First end of the 5th thin film transistor (TFT) T5 is coupled to first end (being nodes X 1) of first capacitor C 1; Its second end is coupled to the grid of the 5th thin film transistor (TFT) T5 and receives the second control signal Rst1; First end of the 6th thin film transistor (TFT) T6 is coupled to second end (being node Y1) of first capacitor C 1, and its second end is coupled to the grid of the 6th thin film transistor (TFT) T6 and receives the 3rd control signal Rst2.
And organic light emission pixel 1002 also can couple one second capacitor C 2 more, and is shown in figure 14, and in the organic light emission pixel 1402, first end of second capacitor C 2 is coupled to node Y1, and the other end of second capacitor C 2 receives the second voltage Vdd.Second capacitor C 2 can be used to help to keep the stable of voltage difference between nodes X 1 and node Y1.
In addition, above-mentioned the 4th thin film transistor (TFT) T4 is in order to Control current I OLEDWhether flow to Organic Light Emitting Diode OLED, its allocation position is except shown in figure 10, and the allocation position of the 4th thin film transistor (TFT) T4 also can be shown in figure 15.Figure 15 is the synoptic diagram of the second routine OLED of present embodiment.In the organic light emission pixel 1502, first termination of the 4th thin film transistor (TFT) T4 is received the second voltage Vdd, and second end of the 4th thin film transistor (TFT) T4 is coupled to first end of the second thin film transistor (TFT) T2, and the grid of the 4th thin film transistor (TFT) T4 also receives the first control signal Enb.
But the 4th thin film transistor (TFT) T4 is bridge joint outer with Control current I in the organic light emission pixel also OLEDWhether flow to Organic Light Emitting Diode OLED.Shown in figure 16, be the synoptic diagram of the 3rd routine OLED of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 1602 outsides; First end of the 4th thin film transistor (TFT) T4 is coupled to the negative electrode of Organic Light Emitting Diode OLED; Second end of the 4th thin film transistor (TFT) T4 is coupled to tertiary voltage Vss, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The 4th thin film transistor (TFT) T4 bridge joint also can be between the second voltage Vdd and the second thin film transistor (TFT) T2 in the outer position of organic light emission pixel.Shown in figure 17, it is the synoptic diagram of the 4th routine OLED of present embodiment.The 4th thin film transistor (TFT) T4 bridge joint is in organic light emission pixel 1702 outsides; First end of the 4th thin film transistor (TFT) T4 is coupled to first end of the second thin film transistor (TFT) T2; Second end of the 4th thin film transistor (TFT) T4 is coupled to the first voltage Vdd, and the grid of the 4th thin film transistor (TFT) T4 receives the first control signal Enb.
The organic light emission pixel of the OLED that the above embodiment of the present invention disclosed with voltage compensation technology; Can make the compensation mechanism speed improvement; And because compensation mechanism faster can remedy existing low temperature polycrystalline silicon (LTPS) technology and cause active organic light-emitting display (AMOLED) picture to show the shortcoming of uneven (Mura).
In sum; Though the present invention discloses as above with preferred embodiment; Right its is not in order to limiting the present invention, anyly is familiar with this technological personnel, do not breaking away from the spirit and scope of the present invention; When can doing various changes and retouching, so protection scope of the present invention is when being as the criterion with what claims defined.

Claims (24)

1.一种像素的驱动方法，其特征在于，该像素具有一第一电容、一第一薄膜晶体管、一第二薄膜晶体管与一有机发光二极管，该第一电容的一第一端耦接该第二膜晶体管的栅极，该第一薄膜晶体管的一第一端接收一第一电压，该第一薄膜晶体管的一第二端耦接至该第一薄膜晶体管的栅极及该第电容的该第一端，该第二薄膜晶体管的一第一端接收一第二电压，该第二薄膜晶体管的一第二端用以输出一像素电流至该有机发光二极管的阳极，该有机发光二极管的阴极接收一第三电压，该驱动方法包括： 1. A pixel driving method, characterized in that the pixel has a first capacitor, a first thin film transistor, a second thin film transistor and an organic light emitting diode, and a first end of the first capacitor is coupled to the The gate of the second thin film transistor, a first end of the first thin film transistor receives a first voltage, a second end of the first thin film transistor is coupled to the gate of the first thin film transistor and the first capacitor The first end, a first end of the second thin film transistor receives a second voltage, a second end of the second thin film transistor is used to output a pixel current to the anode of the organic light emitting diode, the organic light emitting diode The cathode receives a third voltage, and the driving method includes: 截止该有机发光二极管； turning off the organic light emitting diode; 于该有机发光二极管截止期间，提供一第四电压于该第一电容的该第一端，以及提供一第五电压于该第一电容的一第二端，该第四电压与该第一电压间的电压差使该第一薄膜晶体管导通； During the cut-off period of the organic light emitting diode, a fourth voltage is provided at the first terminal of the first capacitor, and a fifth voltage is provided at a second terminal of the first capacitor, the fourth voltage and the first voltage The voltage difference between turns on the first thin film transistor; 于该有机发光二极管截止期间且该第一电容的该第二端的电压位准保持在该第五电压时，移除该第四电压以使该第一电容的该第一端的电压位准因该第二薄膜晶体管的作用改变为一第一电压位准； When the organic light emitting diode is off and the voltage level of the second terminal of the first capacitor is maintained at the fifth voltage, the fourth voltage is removed so that the voltage level of the first terminal of the first capacitor is due to the function of the second thin film transistor is changed to a first voltage level; 于该有机发光二极管截止期间且于该第一电容的该第一端的电压位准上升到该第一电压位准后，改提供一像素电压至该第一电容的该第二端；以及 providing a pixel voltage to the second terminal of the first capacitor during the off period of the organic light emitting diode and after the voltage level of the first terminal of the first capacitor rises to the first voltage level; and 导通该有机发光二极管以使该第三薄膜晶体管依据该第一电容的该第一端的电压位准输出该像素电流至该有机发光二极管。 The organic light emitting diode is turned on so that the third thin film transistor outputs the pixel current to the organic light emitting diode according to the voltage level of the first terminal of the first capacitor. 2.如权利要求1所述的驱动方法，其特征在于，提供该第五电压的步骤由一数据驱动电路与一第三薄膜晶体管执行，该第三薄膜晶体管的一第一端接收该数据驱动电路所输出的该第五电压，该第三薄膜晶体管的一第二端耦接至该第一电容的该第二端，该第三薄膜晶体管的栅极用以接收一扫描信号，当该扫描信号的电压位准使该第三薄膜晶体管导通时，该第三薄膜晶体管提供该第五电压至该第一电容的该第二端。 2. The driving method according to claim 1, wherein the step of providing the fifth voltage is performed by a data driving circuit and a third thin film transistor, a first terminal of the third thin film transistor receives the data driving For the fifth voltage output by the circuit, a second end of the third thin film transistor is coupled to the second end of the first capacitor, and the gate of the third thin film transistor is used to receive a scanning signal. When the scanning When the voltage level of the signal turns on the third thin film transistor, the third thin film transistor provides the fifth voltage to the second terminal of the first capacitor. 3.如权利要求1所述的驱动方法，其特征在于，截止该有机发光二极管的步骤由一第四薄膜晶体管实现，该第四薄膜晶体管的一第一端与一第二端串联于该像素电流所流过的路径上，该第一端为源极或漏极，该第二端为漏 极或源极。 3. The driving method according to claim 1, wherein the step of turning off the organic light emitting diode is realized by a fourth thin film transistor, a first terminal and a second terminal of the fourth thin film transistor are connected in series with the pixel On the path through which the current flows, the first end is the source or the drain, and the second end is the drain or the source. 4.如权利要求1所述的驱动方法，其特征在于，该第五电压的电压位准实质上等于该第四电压的电压位准。 4. The driving method according to claim 1, wherein a voltage level of the fifth voltage is substantially equal to a voltage level of the fourth voltage. 5.一种有机发光像素，其特征在于，包括： 5. An organic light-emitting pixel, characterized in that it comprises: 一第一电容； a first capacitor; 一第一薄膜晶体管，该第一薄膜晶体管的一第一端接收一第一电压，该第一薄膜晶体管的一第二端耦接至该第一薄膜晶体管的栅极及该第一电容的一第一端； A first thin film transistor, a first end of the first thin film transistor receives a first voltage, a second end of the first thin film transistor is coupled to the gate of the first thin film transistor and a first capacitor first end; 一第二薄膜晶体管，该第二薄膜晶体管的一第一端接收一第二电压，该第二薄膜晶体管的栅极耦接至该第一薄膜晶体管的栅极； a second thin film transistor, a first terminal of the second thin film transistor receives a second voltage, the gate of the second thin film transistor is coupled to the gate of the first thin film transistor; 一第三薄膜晶体管，该第三薄膜晶体管的一第一端接收一像素电压，该第三薄膜晶体管的一第二端耦接至该第一电容的一第二端，该第三薄膜晶体管的栅极用以接收一扫描信号； A third thin film transistor, a first end of the third thin film transistor receives a pixel voltage, a second end of the third thin film transistor is coupled to a second end of the first capacitor, and a second end of the third thin film transistor The grid is used to receive a scanning signal; 一重置电路，用以设定该第一电容的该第一端为一第一电压位准；以及 a reset circuit for setting the first terminal of the first capacitor to a first voltage level; and 一有机发光二极管，该有机发光二极管的阳极偶接至该第二薄膜晶体管的一第二端，该有机发光二极管的阴极接收一第三电压； An organic light emitting diode, the anode of the organic light emitting diode is coupled to a second terminal of the second thin film transistor, and the cathode of the organic light emitting diode receives a third voltage; 其中，该第一电压位准低于该第一电压的电压位准。 Wherein, the first voltage level is lower than the voltage level of the first voltage. 6.如权利要求5所述的有机发光像素，其特征在于，该有机发光像素还包括： 6. The organic light emitting pixel according to claim 5, further comprising: 一第四薄膜晶体管，该第四薄膜晶体管的一第一端耦接至该第二薄膜晶体管的该第二端，该第四薄膜晶体管的一第二端耦接至该有机发光二极管的阳极，该第四薄膜晶体管的栅极接收一第一控制信号。 a fourth thin film transistor, a first terminal of the fourth thin film transistor is coupled to the second terminal of the second thin film transistor, a second terminal of the fourth thin film transistor is coupled to the anode of the organic light emitting diode, The gate of the fourth thin film transistor receives a first control signal. 7.如权利要求5所述的有机发光像素，其特征在于，该有机发光像素还包括： 7. The organic light emitting pixel according to claim 5, further comprising: 一第四薄膜晶体管，该第四薄膜晶体管的一第一端接收该第二电压，该第四薄膜晶体管的一第二端耦接至该第二薄膜晶体管的该第一端，该第四薄膜晶体管的栅极接收一第一控制信号。 A fourth thin film transistor, a first terminal of the fourth thin film transistor receives the second voltage, a second terminal of the fourth thin film transistor is coupled to the first terminal of the second thin film transistor, the fourth thin film transistor The gate of the transistor receives a first control signal. 8.如权利要求5所述的有机发光像素，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 8. The organic light emitting pixel according to claim 5, wherein the reset circuit is further used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端接收一第四电压，该第五薄膜晶体管的栅极接收一第二控制信号。 A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor receives a fourth voltage, the fifth thin film transistor The gate of the gate receives a second control signal. 9.如权利要求5所述的有机发光像素，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 9. The organic light emitting pixel according to claim 5, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端耦接该第五薄膜晶体管的栅极并接收一第二控制信号。 A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor is coupled to the gate of the fifth thin film transistor and Receive a second control signal. 10.如权利要求5所述的有机发光像素，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 10. The organic light emitting pixel according to claim 5, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端耦接至该第一电容的该第二端，该第五薄膜晶体管的栅极接收一第二控制信号。 A fifth thin film transistor, a first terminal of the fifth thin film transistor is coupled to the first terminal of the first capacitor, a second terminal of the fifth thin film transistor is coupled to the second terminal of the first capacitor terminal, the gate of the fifth thin film transistor receives a second control signal. 11.如权利要求5所述的有机发光像素，其特征在于，该有机发光像素还包括： 11. The organic light emitting pixel according to claim 5, further comprising: 一第二电容，该第二电容的一第一端耦接至该第一电容的该第二端，该第二电容的一第二端接收该第二电压。 A second capacitor, a first terminal of the second capacitor is coupled to the second terminal of the first capacitor, and a second terminal of the second capacitor receives the second voltage. 12.如权利要求5所述的有机发光像素，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 12. The organic light emitting pixel according to claim 5, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端接收一第四电压，该第五薄膜晶体管的栅极接收一第二控制信号； A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor receives a fourth voltage, the fifth thin film transistor The gate of the gate receives a second control signal; 一第六薄膜晶体管，该第六薄膜晶体管的一第一端耦接至该第一电容的该第二端，该第六薄膜晶体管的一第二端接收该第四电压，该第六薄膜晶体管的栅极接收一第三控制信号。 A sixth thin film transistor, a first end of the sixth thin film transistor is coupled to the second end of the first capacitor, a second end of the sixth thin film transistor receives the fourth voltage, the sixth thin film transistor The gate of the gate receives a third control signal. 13.如权利要求5所述的有机发光像素，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 13. The organic light emitting pixel according to claim 5, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端接收一第四电压，该第五薄膜晶体 管的栅极接收一第二控制信号； A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor receives a fourth voltage, the fifth thin film transistor The gate of the tube receives a second control signal; 一第六薄膜晶体管，该第六薄膜晶体管的一第一端耦接至该第一电容的该第二端，该第六薄膜晶体管的一第二端耦接至该第五薄膜晶体管的该第二端，该第六薄膜晶体管的栅极接收一第三控制信号。 A sixth thin film transistor, a first end of the sixth thin film transistor is coupled to the second end of the first capacitor, a second end of the sixth thin film transistor is coupled to the first end of the fifth thin film transistor Two terminals, the gate of the sixth thin film transistor receives a third control signal. 14.如权利要求5所述的有机发光像素，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 14. The organic light emitting pixel according to claim 5, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端耦接该第五薄膜晶体管的栅极并接收一第二控制信号； A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor is coupled to the gate of the fifth thin film transistor and receiving a second control signal; 一第六薄膜晶体管，该第六薄膜晶体管的一第一端耦接至该第一电容的该第二端，该第六薄膜晶体管的一第二端耦接该第六薄膜晶体管的栅极并接收一第三控制信号。 A sixth thin film transistor, a first end of the sixth thin film transistor is coupled to the second end of the first capacitor, a second end of the sixth thin film transistor is coupled to the gate of the sixth thin film transistor and Receive a third control signal. 15. 一种有机发光显示器，其特征在于，包括： 15. An organic light emitting display, comprising: 至少一像素，包括： At least one pixel, including: 一第一电容； a first capacitor; 一第一薄膜晶体管，该第一薄膜晶体管的一第一端接收一第一电压，该第一薄膜晶体管的一第二端耦接至该第一薄膜晶体管的栅极及该第一电容的一第一端； A first thin film transistor, a first end of the first thin film transistor receives a first voltage, a second end of the first thin film transistor is coupled to the gate of the first thin film transistor and a first capacitor first end; 一第二薄膜晶体管，该第二薄膜晶体管的一第一端接收一第二电压，该第二薄膜晶体管的栅极耦接至该第一薄膜晶体管的栅极； a second thin film transistor, a first terminal of the second thin film transistor receives a second voltage, the gate of the second thin film transistor is coupled to the gate of the first thin film transistor; 一第三薄膜晶体管，该第三薄膜晶体管的一第一端接收一像素电压，该第三薄膜晶体管的一第二端耦接至该第一电容的一第二端，该第三薄膜晶体管的栅极用以接收一扫描信号； A third thin film transistor, a first end of the third thin film transistor receives a pixel voltage, a second end of the third thin film transistor is coupled to a second end of the first capacitor, and a second end of the third thin film transistor The grid is used to receive a scan signal; 一重置电路，用以设定该第一电容的该第一端为一第一电压位准；以及 a reset circuit for setting the first terminal of the first capacitor to a first voltage level; and 一有机发光二极管，该有机发光二极管的阳极偶接至该第二薄膜晶体管的一第二端，该有机发光二极管的阴极接收一第三电压；以及 An organic light emitting diode, the anode of the organic light emitting diode is coupled to a second terminal of the second thin film transistor, and the cathode of the organic light emitting diode receives a third voltage; and 一驱动单元，用以驱动该像素，该驱动单元包括： A driving unit, used to drive the pixel, the driving unit includes: 一数据驱动电路，用以输出该像素电压； a data driving circuit for outputting the pixel voltage; 一扫描驱动电路，用以输出该扫描信号；及  A scan driving circuit, used to output the scan signal; and 一时序控制电路，用以控制该重置电路设定该第一电容的该第一端为该第一电压位准； a timing control circuit, used to control the reset circuit to set the first terminal of the first capacitor to the first voltage level; 其中，该第一电压位准低于该第一电压的电压位准，该驱动电路更用以提供该第一电压、该第二电压与该第三电压。 Wherein, the first voltage level is lower than the voltage level of the first voltage, and the driving circuit is further used to provide the first voltage, the second voltage and the third voltage. 16.如权利要求15所述的有机发光显示器，其特征在于，该像素还包括： 16. The OLED according to claim 15, wherein the pixel further comprises: 一第四薄膜晶体管，该第四薄膜晶体管的一第一端耦接至该第二薄膜晶体管的该第二端，该第四薄膜晶体管的一第二端耦接至该有机发光二极管的阳极，该第四薄膜晶体管的栅极接收由该时序控制电路输出的一第一控制信号。 a fourth thin film transistor, a first terminal of the fourth thin film transistor is coupled to the second terminal of the second thin film transistor, a second terminal of the fourth thin film transistor is coupled to the anode of the organic light emitting diode, The gate of the fourth thin film transistor receives a first control signal output by the timing control circuit. 17.如权利要求15所述的有机发光显示器，其特征在于，该像素还包括： 17. The OLED according to claim 15, wherein the pixel further comprises: 一第四薄膜晶体管，该第四薄膜晶体管的一第一端接收该第二电压，该第四薄膜晶体管的一第二端耦接至该第二薄膜晶体管的该第一端，该第四薄膜晶体管的栅极接收由该时序控制电路输出的一第一控制信号。 A fourth thin film transistor, a first terminal of the fourth thin film transistor receives the second voltage, a second terminal of the fourth thin film transistor is coupled to the first terminal of the second thin film transistor, the fourth thin film transistor The gate of the transistor receives a first control signal output by the timing control circuit. 18.如权利要求15所述的有机发光显示器，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 18. The organic light emitting display according to claim 15, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端接收一第四电压，该第五薄膜晶体管的栅极接收一第二控制信号，该时序控制电路输出该第二控制信号，该驱动单元用以提供该第四电压。 A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor receives a fourth voltage, the fifth thin film transistor The gate of the gate receives a second control signal, the timing control circuit outputs the second control signal, and the driving unit is used to provide the fourth voltage. 19.如权利要求15所述的有机发光显示器，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 19. The organic light emitting display according to claim 15, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端耦接该第五薄膜晶体管的栅极，该第五薄膜晶体管的栅极接收一第二控制信号，该时序控制电路输出该第二控制信号。 a fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor is coupled to the gate of the fifth thin film transistor, The gate of the fifth thin film transistor receives a second control signal, and the timing control circuit outputs the second control signal. 20.如权利要求15所述的有机发光显示器，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 20. The organic light emitting display as claimed in claim 15, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端耦接至该第一电容的该第二端，该 第五薄膜晶体管的栅极接收一第二控制信号，该时序控制电路输出该第二控制信号。 A fifth thin film transistor, a first terminal of the fifth thin film transistor is coupled to the first terminal of the first capacitor, a second terminal of the fifth thin film transistor is coupled to the second terminal of the first capacitor terminal, the gate of the fifth thin film transistor receives a second control signal, and the timing control circuit outputs the second control signal. 21.如权利要求15所述的有机发光显示器，其特征在于，该像素还包括： 21. The organic light emitting display according to claim 15, wherein the pixel further comprises: 一第二电容，该第二电容的一第一端耦接至该第一电容的该第二端，该第二电容的一第二端接收该第二电压。 A second capacitor, a first terminal of the second capacitor is coupled to the second terminal of the first capacitor, and a second terminal of the second capacitor receives the second voltage. 22.如权利要求15所述的有机发光显示器，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 22. The organic light emitting display according to claim 15, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端接收一第四电压，该第五薄膜晶体管的栅极接收一第二控制信号； A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor receives a fourth voltage, the fifth thin film transistor The gate of the gate receives a second control signal; 一第六薄膜晶体管，该第六薄膜晶体管的一第一端耦接至该第一电容的该第二端，该第六薄膜晶体管的一第二端接收该第四电压，该第六薄膜晶体管的栅极接收一第三控制信号，该时序控制电路输出该第二控制信号与该第三控制信号，该驱动电路更用以提供该第四电压。 A sixth thin film transistor, a first end of the sixth thin film transistor is coupled to the second end of the first capacitor, a second end of the sixth thin film transistor receives the fourth voltage, the sixth thin film transistor The gate of the gate receives a third control signal, the timing control circuit outputs the second control signal and the third control signal, and the driving circuit is further used to provide the fourth voltage. 23.如权利要求15所述的有机发光显示器，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 23. The organic light emitting display according to claim 15, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端接收一第四电压，该第五薄膜晶体管的栅极接收一第二控制信号； A fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor receives a fourth voltage, the fifth thin film transistor The gate of the gate receives a second control signal; 一第六薄膜晶体管，该第六薄膜晶体管的一第一端耦接至该第一电容的该第二端，该第六薄膜晶体管的一第二端耦接至该第五薄膜晶体管的该第端，该第六薄膜晶体管的栅极接收一第三控制信号，该时序控制电路输出该第二控制信号与该第三控制信号，该驱动电路更用以提供该第四电压。 A sixth thin film transistor, a first end of the sixth thin film transistor is coupled to the second end of the first capacitor, a second end of the sixth thin film transistor is coupled to the first end of the fifth thin film transistor terminal, the gate of the sixth thin film transistor receives a third control signal, the timing control circuit outputs the second control signal and the third control signal, and the driving circuit is further used to provide the fourth voltage. 24.如权利要求15所述的有机发光显示器，其特征在于，该重置电路还用以重置该第一电容，该重置电路包括： 24. The organic light emitting display according to claim 15, wherein the reset circuit is also used to reset the first capacitor, the reset circuit comprising: 一第五薄膜晶体管，该第五薄膜晶体管的一第一端耦接至该第一电容的该第一端，该第五薄膜晶体管的一第二端耦接该第五薄膜晶体管的栅极，该第五薄膜晶体管的栅极接收一第二控制信号； a fifth thin film transistor, a first end of the fifth thin film transistor is coupled to the first end of the first capacitor, a second end of the fifth thin film transistor is coupled to the gate of the fifth thin film transistor, The gate of the fifth thin film transistor receives a second control signal; 一第六薄膜晶体管，该第六薄膜晶体管的一第一端耦接至该第一电容的 该第二端，该第六薄膜晶体管的一第二端耦接该第六薄膜晶体管的栅极，该第六薄膜晶体管的栅极接收一第三控制信号，该时序控制电路输出该第二控制信号与该第三控制信号。  A sixth thin film transistor, a first end of the sixth thin film transistor is coupled to the second end of the first capacitor, a second end of the sixth thin film transistor is coupled to the gate of the sixth thin film transistor, The gate of the sixth thin film transistor receives a third control signal, and the timing control circuit outputs the second control signal and the third control signal. the
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