CN102945654B - Organic light emitting display, driving circuit thereof and method of driving the same - Google Patents
Organic light emitting display, driving circuit thereof and method of driving the same Download PDFInfo
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Abstract
The invention provides a method for driving a driving circuit of an organic light emitting display. Each pixel of the driving circuit comprises three transistors, a capacitor and an organic light emitting diode. First, a reference voltage is provided to charge a first terminal of the capacitor, and a reset voltage is provided to discharge a second terminal of the capacitor. Then, the discharging of the second end of the capacitor is stopped, and a driving voltage signal is provided to one end of one of the transistors by using the control element so as to charge the second end of the capacitor. Subsequently, the first terminal of the capacitor is charged with the data voltage, and the supply of the driving voltage signal is stopped, respectively. Then, the first end of the capacitor is floated and the organic light emitting diode is driven.
Description
[technical field]
The present invention system about a kind of OLED and its drive circuit with and driving method, espespecially a kind ofly respectively look likeElement has three transistorized OLED and its drive circuit and drives the method for this drive circuit.
[background technology]
In recent years, Organic Light Emitting Diode (organiclight-emittingdisplay, OLED) display graduallyGradually become popular emerging flat-panel screens, owing to having, self-luminous, wide viewing angle, reaction time are fast, high-luminous-efficiency, low operationThe advantage such as voltage, plate thickness is thin, can be made into flexibility panel and processing procedure is simple, has therefore been widely used in variousPlane shows on product.
The pixel system of tradition OLED controls and drives work with a switching transistor and a driving transistorsFor the Organic Light Emitting Diode of display unit. But driving transistors, after long-time use, can produce the inclined to one side of critical voltageMove. And in the time of OLED display frame, the position of each driving transistors is not identical with the operating time, makesThe side-play amount of the critical voltage of each driving transistors also can be different. Moreover, the drive current system of Organic Light Emitting DiodeBe a square proportional relation with the difference of the grid of driving transistors and the voltage difference of source electrode and critical voltage. Thus, work as differenceThe pixel in region receives while having the pixel data of identical voltage, due to the difference of the critical voltage of driving transistors, makesIn these pixels, the value of drive current that is provided to Organic Light Emitting Diode is inconsistent, has caused Organic Light Emitting Diode to existThe brightness producing while receiving the voltage of same pixel data is different, thereby makes picture that OLED shows notEvenly.
Therefore, existing development is for increasing by a compensating circuit in each pixel, to utilize two electric capacity of four transistor AND gatesDrive Organic Light Emitting Diode, and compensate the error of critical voltage. But, along with the size of organic light emitting display face version is dwindled,The aperture opening ratio of pixel can reduce, and the increase of compensating circuit more can limit the aperture opening ratio of each pixel significantly. In view of this, promoteThe aperture opening ratio of the pixel of OLED, and maintain the real target of making great efforts for industry of the uniformity of shown picture.
[summary of the invention]
One of main purpose of the present invention is to provide a kind of OLED, its drive circuit and drives it to driveThe method of moving circuit, to promote the aperture opening ratio of pixel of OLED.
In order to achieve the above object, the invention provides a kind of method of the drive circuit that drives OLED. DriveCircuit includes multiple pixels and a control element, and each pixel packets contains a first transistor, a transistor seconds, oneThree transistors, an electric capacity and an Organic Light Emitting Diode, wherein control element is electrically connected to the first end of transistor seconds.First, provide respectively a reference voltage to being electrically connected to the first end charging of each electric capacity of control end of each transistor seconds,And provide one to reset voltage to being electrically connected to the second end of each transistor seconds and the anode of each Organic Light Emitting DiodeThe second end electric discharge of each electric capacity. Then, stop the electric discharge of the second end of each electric capacity, and utilize control element that one driving electricity is providedPress the first end of signal to each transistor seconds, with second of the each electric capacity to the second end that is electrically connected to each transistor secondsEnd charging. Subsequently, utilize respectively the first end charging of a data voltage to each electric capacity, and stop providing drive voltage signal.Then, the first end of the each electric capacity of suspension joint, and drive Organic Light Emitting Diode.
In order to achieve the above object, the invention provides a kind of OLED, include a substrate, many data wires,Many reset pressure-wire, multi-strip scanning line, many drive voltage line, many reset holding wire and multiple pixel. Data wire edgeA first direction and be sequentially arranged on substrate, and each data wire is used for transmitting a reference voltage or a data voltage. Reset electricityLine ball is sequentially arranged on substrate along this first direction, and respectively resets pressure-wire and reset voltage for transmitting one. Scan line edgeA second direction that is different from first direction and be arranged on substrate, for transmitting one scan signal. Drive voltage line is alongTwo directions are arranged on this substrate, for transmitting a drive voltage signal. Reset holding wire and be arranged in substrate along second directionUpper, reset signal for transmitting one. Pixel is an array mode and is arranged on substrate, and each data wire, respectively resets pressure-wire, eachScan line and each drive voltage line are around each pixel. Each pixel packets contains a first transistor, a transistor seconds, the 3rdTransistor, an electric capacity and an Organic Light Emitting Diode. The first transistor is arranged on substrate, and has a first end and electrically connectBe connected to corresponding data wire, one second end and a control end and be electrically connected to corresponding scan line. Transistor seconds is establishedBe placed on substrate, and there is a first end and be electrically connected to corresponding drive voltage line, one second end and a control end electricityProperty is connected to the second end of the first transistor. The 3rd transistor is arranged on substrate, and has a first end and be electrically connected to phaseCorresponding reset the second end and the control end that pressure-wire, one second end be electrically connected to transistor seconds and be electrically connected toThe corresponding holding wire of reseting. Electric capacity is arranged on substrate, and has a first end and be electrically connected to second of the first transistorEnd and one second end are electrically connected to the 3rd transistorized the second end. Organic Light Emitting Diode is arranged on substrate, and hasThe second end and a negative electrode that one anode is electrically connected to transistor seconds are electrically connected to a low-tension supply.
In order to achieve the above object, the invention provides a kind of drive circuit of OLED, include multiple pixelsAn and control element. Each pixel packets contain a first transistor, a transistor seconds, one the 3rd transistor, an electric capacity andOne Organic Light Emitting Diode. The first transistor has a first end for receiving a data voltage or a reference voltage, one secondEnd and a control end are used for receiving one scan signal. Transistor seconds has a first end for receiving a driving voltage letterNumber, one second end and a control end be electrically connected to the second end of the first transistor. The 3rd transistor has a first end and usesReset voltage, one second end and be electrically connected to the second end of transistor seconds and a control end for receiving one in receiving oneReset signal. Electric capacity has a first end and is electrically connected to the second end of the first transistor, and one second end is electrically connected toThe second end of the 3rd transistorized the second end and transistor seconds. Organic Light Emitting Diode has an anode and is electrically connected to secondTransistorized the second end and a negative electrode are electrically connected to a low-tension supply. Control element is electrically connected to first of transistor secondsEnd, for providing drive voltage signal.
Each pixel of OLED of the present invention can only be used three transistor AND gate one electric capacity can reach drivingOrganic Light Emitting Diode 130, and compensate the skew of the critical voltage that transistor seconds produces, can effectively reduce by this transistorQuantity, and can reduce the shared area of transistor, therefore the aperture opening ratio of each pixel can effectively promote.
[brief description of the drawings]
Fig. 1 be first embodiment of the invention OLED on look schematic diagram.
Fig. 2 is that Fig. 1 is in the enlarged diagram of region A.
Fig. 3 be the OLED of first embodiment of the invention each pixel region on look schematic diagram.
Fig. 4 is the drive circuit signal of the OLED of the first embodiment of the invention pixel that is positioned at same rowFigure.
Fig. 5 is the driving method flow chart of the drive circuit of the OLED of first embodiment of the invention.
Fig. 6 is data-signal of the present invention, sweep signal, drive voltage signal and the signal of reseting the time sequential routine of signalFigure.
Fig. 7 be second embodiment of the invention OLED on look schematic diagram.
[main element symbol description]
100 OLED 102 substrates
102b surrounding zone, 102a viewing area
102c pixel region 102d fanout area
104 data wires 106 are reseted pressure-wire
108 scan lines 110 are reseted holding wire
112 drive voltage line 114 pixels
116a first control element 116b the second control element
118 first direction 120 second directions
122 the first transistor 122a first grids
122b the first source electrode 122c first drains
122d the first semiconductor layer 124 transistor secondses
124a second grid 124b the second source electrode
124c second 124d the second semiconductor layer that drains
126 the 3rd transistor 126a the 3rd grids
126b the 3rd source electrode 126c the 3rd drain electrode
126d the 3rd semiconductor layer 128 electric capacity
130 Organic Light Emitting Diode 130a anodes
130b negative electrode 130c luminescent layer
132 low-tension supply 134 first perforation
136 second perforation 200 OLED
202 scan line 202a odd-numbered scan lines
202b even-line interlace line 204 is reseted holding wire
204a odd number is reseted holding wire 204b even number and is reseted holding wire
206 drive voltage line 206a odd number drive voltage line
206b even number drive voltage line C1 first end
C2 second end D1 the second end
D2 second end D3 the second end
EM drive voltage signal G1 control end
G2 control end G3 control end
S1 first end S2 first end
S3 first end Sscan sweep signal
Sdata data-signal Sreset resets signal
Vsus resets voltage
[detailed description of the invention]
Please refer to Fig. 1, in the OLED that Fig. 1 is first embodiment of the invention, look schematic diagram, and Fig. 2 is figure1 in the enlarged diagram of region A. As shown in Figure 1, OLED 100 includes a substrate 102, for example: glass, mouldThe transparency carriers such as glue or quartz, and substrate 102 has a viewing area 102a and a surrounding zone 102b around viewing area 102a.102a system in viewing area is for display frame, and the substrate 102 of viewing area 102a has multiple pixels of arranging in an array modeDistrict 102c, but be not limited to this. And 102b system in surrounding zone is used for arranging peripheral circuit and control element, and surrounding zone 102bSubstrate 102 has multiple fanout areas (fanoutregion) 102d, extends to surrounding zone in order to arrange from viewing area 102aThe circuit of 102b. In addition, OLED 100 separately includes many data wires 104, many and resets pressure-wire 106, manyScan line 108, many are reseted holding wire 110 and many drive voltage line 112, multiple pixel 114, multiple the first control element116a and multiple the second control element 116b. Wherein, each the first control element 116a is arranged at the substrate 102 of surrounding zone 102bUpper, and with corresponding data wire 104 with reset pressure-wire 106 and be electrically connected, and each the first control element 116a can be respectivelyOne data driving chip, for example: be integrated with data drive circuit and the driving chip of reseting Voltag driving circuit, for differenceProvide a data-signal, for example: a reference voltage or a data voltage, to each data wire 104, and provide respectively one to reset voltageTo respectively reseting pressure-wire 106, but be not limited to this. Each the second control element 116b is arranged on the substrate 102 of surrounding zone 102b, andWith corresponding scan line 108, drive voltage line 112 and reset holding wire 110 and be electrically connected, and each the second control element 116bCan be respectively a driving chip, for example, be integrated with scan drive circuit, drive voltage circuit and reset the grid of signal drive circuitThe utmost point drives chip, for providing respectively one scan signal to each scan line 108, provide a drive voltage signal to respectively driving respectivelyMoving pressure-wire 112 and provide respectively one to reset signal to and respectively reset holding wire 110, but the invention is not restricted to this. And, each numberBe used for data signal to each pixel 114 according to linear system. Respectively reset pressure-wire 106 and reset voltage to each pixel 114 for transmitting.Each scan line 108 is for transmitting sweep signal to each pixel 114. Each drive voltage line is used for transmitting drive voltage signal to each pictureElement 114. Respectively reset holding wire 110 transmission and reset signal to each pixel 114. The first control element of the present invention and second is controlled unitPart is not limited to above-mentioned driving chip, also can be other control chips. In other embodiment of the present invention, each drive voltage lineDrive voltage signal also can drive chips provide by other different from grid drive chip.
In the present embodiment, each data wire 104 with respectively reset pressure-wire 106 sequentially along an alternately row of first direction 118List on substrate 102, and extend to the substrate 102 of fanout area 102d from viewing area 102a, with the first control element 116aBe electrically connected. Each scan line 108, each drive voltage line 112 with respectively reset holding wire 110 and be sequentially different from first direction along one118 second direction 120 alternative arrangements are on substrate 102, and with each data wire 104 and respectively reset pressure-wire 106 and mutually hand overMistake, and extend to the substrate 102 of fanout area 102d from viewing area 102a, to be electrically connected with the second control element 116b. AndAnd each pixel 114 is on the substrate 102 being arranged at respectively in each pixel region 102c, and by each data wire 104, respectively reset voltage112 of line 106, each scan line 108 and each drive voltage line around.
As shown in Figure 2, each the second control element 116b has multiple connection pad 116c, and correspondence extends to the second control unit respectivelyEach scan line 108 of part 116b below, each drive voltage line 112 and respectively reset holding wire 110, and each connection pad 116c is by weldingMode respectively with each scan line 108, each drive voltage line 112 with respectively reset holding wire 110 and be electrically connected.
The pixel of the present embodiment will be further described below. Please refer to Fig. 3 and Fig. 4, Fig. 3 is first embodiment of the inventionOn each pixel region of OLED, look schematic diagram, and Fig. 4 OLED that is first embodiment of the inventionBe positioned at the drive circuit schematic diagram of the pixel of same row. As shown in Figure 3 and Figure 4, each pixel 114 includes a first transistor122, transistor seconds 124, one the 3rd transistor 126, an electric capacity 128 and an Organic Light Emitting Diode 130. The first transistor122 have a first grid 122a drains as a first end S1, one first as a control end G1, one first source electrode 122b122c is as one second end D1 and one first semiconductor layer 122d. Transistor seconds 124 has a second grid 124a conductOne control end G2, one second source electrode 124b as a first end S2, one second drain electrode 124c as one second end D2 and one theTwo semiconductor layer 124d. The 3rd transistor 126 has one the 3rd grid 126a and does as a control end G3, one the 3rd source electrode 126bBe that a first end S3, one the 3rd drain electrode 126c are as one second end D3 and one the 3rd semiconductor layer 126d. And, electric capacity 128There are two electrodes, respectively as a first end C1 and one second end C2. Moreover Organic Light Emitting Diode 130 has an anode130a, a negative electrode 130b and a luminescent layer 130c.
In each the first transistor 122, control end G1 system is electrically connected with corresponding scan line 108, sweeps for receivingRetouch signal, first end S1 system is electrically connected with corresponding data wire 104, for receiving data-signal, and the second end D1 and theThe control end G2 of two-transistor 124, the first end C1 of electric capacity 128 are electrically connected. In each transistor seconds 124, first end S2System is electrically connected with corresponding drive voltage line 112, for receiving drive voltage signal, and the second end D2 and each organic light emissionThe second end D3 of the anode 130a of diode 130, the second end C2 of electric capacity 128 and the 3rd transistor 126 is electrically connected. InIn three transistors 126, control end G3 with reset holding wire 110 and be electrically connected, reset signal for receiving, and first end S3 is with heavyIf pressure-wire 106 is electrically connected, reset voltage for receiving. And the negative electrode 130b of Organic Light Emitting Diode 130 is electrically connectedTo for a low-tension supply 132 of a low-voltage is provided, and Organic Light Emitting Diode 130 separately has a parasitic capacitance 130d, electricityProperty is connected between the anode 130a and negative electrode 130b of Organic Light Emitting Diode 130.
In the present embodiment, scan line 108, first grid 122a, second grid 124a, reset holding wire 110, the 3rd gridUtmost point 126a and drive voltage line 112 are formed by a first metal layer, wherein, and scan line 108 and first grid 122a phaseConnect, and reset holding wire 110 and be connected with the 3rd grid 126a. And a part of second grid 124a is as electric capacity 128The electrode of first end C1. In addition, data wire 104, the first source electrode 122b, the first drain electrode 122c, the second drain electrode 124c, the 3rd drain electrode126c, the second source electrode 124b, reset pressure-wire 106, the 3rd source electrode 126b system is formed by one second metal level. Wherein, dataLine 104 is connected with the first source electrode 122b. Second drain electrode 124c with the 3rd drain electrode 126c be connected, and second drain 124c onePart is as the electrode of electric capacity 128 second end C2. Reseting pressure-wire 106 is connected with the 3rd source electrode 126b. Moreover, the first drain electrode122c system is electrically connected with second grid 124a by one first perforation 134, and the second drain electrode 124b system is by one second perforation136 are electrically connected with drive voltage line 112. The first semiconductor layer 122d system is arranged at first grid 122a and the first source electrode 122bAnd first drain electrode 122c between. The second semiconductor layer 124d system is arranged at second grid 124a and the second source electrode 124b and theBetween two drain electrode 124c. The 3rd semiconductor layer 126d system is arranged at the 3rd grid 126a and the 3rd source electrode 126b and the 3rd drain electrodeBetween 126c. In addition, the anode 130a of Organic Light Emitting Diode 130, luminescent layer 130c and negative electrode 130b are sequentially stacked in secondOn drain electrode 124c. OLED 100 that it should be noted that the present embodiment does not include a high-voltage power-line, and eachPixel is only used three transistors can reach the skew that drives Organic Light Emitting Diode 130 and compensation transistor critical voltageEffect, and then can maintain the uniformity of shown picture.
Below by the driving method of drive circuit of OLED of the present embodiment is described in further detail, to reachTo the effect that only uses three transistor driving Organic Light Emitting Diodes. And, in order to clearly demonstrate the driving electricity of each row pixelThe driving method on road, below describes as an example of same row pixel example, but the present invention is not limited to this, different lines picture of the present inventionThe drive circuit of element can drive in the same manner. Please refer to Fig. 5 and Fig. 6, and in the lump with reference to figure 4. Fig. 5 is the present inventionThe driving method flow chart of the drive circuit of the OLED of one embodiment, and Fig. 6 is data-signal of the present invention, sweepsRetouch signal, drive voltage signal and reset the schematic diagram in the time sequential routine of signal. As shown in Figures 4 to 6, the present embodiment is organicThe driving method of the drive circuit of active display includes:
Step S10: provide respectively reference voltage Vref to being electrically connected to control end G2 each of each transistor seconds 124The first end C1 charging of electric capacity 128, and provide and reset voltage Vreset to being electrically connected to second of each transistor seconds 124The second end C2 electric discharge of each electric capacity 128 of the anode 130a of end D2 and each Organic Light Emitting Diode 130;
Step S12: stop the electric discharge of the second end C2 of each electric capacity 128, and utilize the second control element 116b to provide and driveMoving voltage signal EM is to the first end S2 of each transistor seconds 124, with to the second end that is electrically connected to each transistor seconds 124The second end C2 charging of each electric capacity 128 of D2;
Step S14: utilize respectively the first end C1 charging of data voltage Vdata to each electric capacity 128, and stop providing and driveMoving voltage signal EM; And
Step S16: the first end C1 of the each electric capacity 128 of suspension joint, and drive Organic Light Emitting Diode 130. And, provide toSweep signal Sscan, the data-signal Sdata of the drive circuit of OLED 100, reset signal Sreset and drivingVoltage signal EM consist predominantly of one reset period TD1, a critical voltage compensation period TD2, data write period TD3 andOne luminous period TD4, and to reset voltage Vsus be DC voltage.
In step S10, the drive circuit system of OLED 100 operates in and resets period TD1, and sweep signalSscan and data-signal Sdata are complementary signal, that is sweep signal Sscan and data-signal Sdata have same frequencyRate, but there is the phase difference of 180 degree, making in the time that sweep signal is logic high levle, data-signal is reference voltage, and works asWhen sweep signal is logic low level, data-signal is the data voltage for display frame, and data voltage is greater than with reference to electricityPress. Therefore, reseting in period TD1, in the time that sweep signal is logic high levle, each the first transistor 122 of same row pixelBe unlocked, and because the first end S1 of each the first transistor 122 is electrically connected to each data wire, make to provide to each first crystalThe reference voltage Vref of each data-signal Sdata of the first end S1 of pipe 122 can be by each the first transistor 122 to each the first crystalline substanceThe second end D1 charging of body pipe 122, that is the first end C1 of each electric capacity 128 is charged. Meanwhile, reseting in period TD1, resetSignal Sreset is logic high levle, and drive voltage signal EM is logic low level, therefore each the 3rd crystalline substance of same row pixelBody pipe 126 can be unlocked, and respectively resets pressure-wire because the first end S3 of each the 3rd transistor 126 is electrically connected to, and makes to carryFor respectively reseting voltage Vsus and can put the second end D3 of each the 3rd transistor 126 to the first end S3 of each the 3rd transistor 126Electricity, that is the second end C2 of each electric capacity 128 is discharged. Hence one can see that, and in reseting period TD1, each electric capacity 128 is utilization referenceVoltage Vref and the action of reseting voltage Vsus the voltage of first end C1 and the second end C2 is reset (reset), objectTo drive the data voltage Vdata of new picture correctly to write in order to allow. Now, the voltage of the first end C1 of each electric capacity 128For reference voltage Vref, and the voltage of the second end C2 is for reseting voltage Vsus. In addition, the negative electrode of each Organic Light Emitting Diode is electricalBe connected to low-voltage, and reset voltage Vsus system and be less than low-voltage, making to reset voltage Vsus can be to electricity in reseting period TD1Hold the second end C2 electric discharge of 128. In the present embodiment, sweep signal Sscan has multiple logic Gao Zhun in reseting period TD1Position period and multiple logic low level period, and data-signal Sdata has multiple reference voltage periods in reseting period TD1With multiple data voltage period, but the present invention is not limited to this, and in other embodiment of the present invention, sweep signal is in the time resetingDuan Yike only has unity logic high levle, and data-signal only has the single reference voltage period.
In step S12, the drive circuit system of OLED 100 operates in critical voltage compensation period TD2. ThisTime, sweep signal Sscan and data-signal Sdata system is with to reset period TD1 identical, and therefore reference voltage Vref is still to each electricityHold 128 first end C1 charging, make the voltage of the control end G2 of each transistor seconds 124 can be reference voltage Vref, and logicalCross reference voltage Vref and open each transistor seconds 124. Meanwhile, reset signal Sreset and be converted to logic low level, make eachThe second end C2 of electric capacity 128 presents floating because each the 3rd transistor 126 is closed, and then stop each electric capacity 128The second end C2 electric discharge. But, drive voltage signal EM system is converted to logic high levle from logic low level, and because of each the second crystalPipe 124 is in opening, so the voltage of the second end C2 of each electric capacity 128 is to be decided by drive voltage signal EM, and drivesMoving voltage signal EM can be to being electrically connected to the second end C2 charging of each electric capacity 128 of the second end D2 of each transistor seconds 124.Because the control end G2 of each transistor seconds 124 and the critical voltage of the second end D2 are Vt, therefore when each transistor seconds 124When the voltage of the second end D2 is charged to Vref-Vt by drive voltage signal EM, each transistor seconds 124 can be closed, and driving hasThe electric current I of OLEDOLEDReduce to zero. Now, the voltage of the second end D2 of each transistor seconds 124 can be according to following sideFormula determines:
Vs=Vref-Vt；
Wherein:
Vs is the voltage of the second end C2 of each transistor seconds 124;
Vref is reference voltage; And
Vt is the critical voltage (thresholdvoltage) of each transistor seconds 124.
In step S14, the drive circuit system of OLED 100 operates in data and writes period TD3. Now,Sweep signal Sscan not with data-signal Sdata complementation, and in the time that sweep signal Sscan is logic high levle, data letterNumber Sdata can be data voltage Vdata, and each the first transistor 122 can be in opening, makes to provide to each first crystalEach data voltage Vdata of the first end S1 of pipe 122 first end C1 charging to each electric capacity 128 respectively. By this, each the second crystalline substanceThe voltage of the control end G2 of body pipe 124 can be respectively each data voltage Vdata. And, write in period TD3 in data, resetSignal Sreset is still in logic low level, and drive voltage signal EM is converted to logic low level, drives electricity to stop providingPress signal to each transistor seconds 124. It is worth mentioning that, data voltage Vdata is by the control end G2 of transistor seconds 122Control the electric current I that drives Organic Light Emitting Diode 130OLEDSize, and electric current IOLEDSize be corresponding Organic Light Emitting Diode130 GTG value. Therefore, when data-signal Sdata is converted to data voltage Vdata from reference voltage Vref, and electric capacity 128When the second end C2 system is floating, the voltage V of the second end D2 of transistor seconds 124SCan determine according to following equation:
VS=Vref-Vt+a(Vdara-Vref)，
Wherein:
Vdata is data voltage;
C1 is the capacitance of electric capacity 128; And
C2 is the equivalent capacitance value of Organic Light Emitting Diode 130, i.e. the capacitance of parasitic capacitance 130c.
In step S16, the drive circuit system of OLED 100 operates in luminous period TD4. Now, scanningSignal Sscan system is converted to logic low level, and each the first transistor 124 is closed, and the first end of the each electric capacity 128 of suspension jointC1. Therefore, the voltage of the first end C1 of each electric capacity 128 is still data voltage Vdata, makes transistor seconds 124 still for opening shapeState. Meanwhile, drive voltage signal EM is converted to logic high levle, and because the first end S2 of each transistor seconds 124 electrically connectsBe connected to drive voltage line, therefore provide to the driving electricity of the first end S2 of each transistor seconds 124 from the second control element 116bPress signal EM to drive each Organic Light Emitting Diode 130 by each transistor seconds 124. Now, the control of each transistor seconds 124The voltage V of system end G2GAnd the voltage V of the second end S2 of each transistor seconds 124SCan determine according to following equation:
VG=Vdata+Vt-Vref-a(Vdata-Vref)+OVSS+VOLED，
Vs=OVSS+VOLED；
Wherein:
VGBe the voltage of the control end G1 of each transistor seconds 124;
OVSS is the voltage of the negative electrode 130b of each Organic Light Emitting Diode 130, i.e. low-voltage; And
VOLED is the cross-pressure of each Organic Light Emitting Diode 130.
Because the voltage VG of control end G2 and the voltage VS of the second end S2 of each transistor seconds 124 are all known, so eachThe control end G2 of transistor seconds 124 and the voltage difference VGS of the second end S2 can determine according to following equation:
VGS=VG-VS
=Vdata+Vt-Vref-a(Vdata-Vref)+OVSS+VOLED
-OVSS-VOLED
=(1-a)(Vdata-Vref)+Vt
Therefore, now drive the electric current I OLED of Organic Light Emitting Diode to determine according to following equation:
IOLED=k(VGS-Vt)2=k[(1-a)(Vdata-Vref)]2
Hence one can see that, by the electric current I OLED of each Organic Light Emitting Diode and the critical voltage Vt of transistor seconds 124 withLow-voltage OVSS is irrelevant.
From the above, the OLED 100 of the present embodiment can be utilized above-mentioned driving method, and arranges in pairs or groups threeTransistor AND gate one electric capacity can reach and drive Organic Light Emitting Diode 130, and compensates the critical voltage that transistor seconds producesSkew. By this, each pixel of the OLED 100 of the present embodiment only needs to configure three transistor AND gate one electric capacity, andCan effectively reduce number of transistors, and can reduce the shared area of transistor, the aperture opening ratio of each pixel can effectively be promoted. AndAnd the OLED 100 of the present embodiment more can not include a high-voltage power-line, and more effectively reduction configures circuit,Therefore also can promote the aperture opening ratio of each pixel.
OLED of the present invention is not limited with above-described embodiment. Below will continue disclose of the present invention otherEmbodiment or change shape, so for the purpose of simplifying the description and highlight each embodiment or change the difference between shape, hereinafter uses identicalLabel mark similar elements, and no longer counterweight partly repeats again.
Please refer to Fig. 7, in the OLED that Fig. 7 is second embodiment of the invention, look schematic diagram. As Fig. 7 instituteShow, the scan line of the present embodiment, reset putting in order of holding wire and drive voltage line and be and the putting in order of the first embodimentDifferent. In the present embodiment, the scan line 202 of OLED 200 can divide into odd-numbered scan lines 202a and even number is sweptRetouch line 202b, and each odd-numbered scan lines 202a and each even-line interlace line 202b are sequentially along second direction 120 alternative arrangements. ResetHolding wire 204 can divide into that odd number is reseted holding wire 204a and even number is reseted holding wire 204b, and each odd number is reseted holding wire204a and each even number are reseted holding wire 204b sequentially along second direction 120 alternative arrangements. Drive voltage line 206 can be divided into veryNumber drive voltage line 206a and even number drive voltage line 206b, and each odd number drive voltage line 206a and each even number drive voltage line206b is sequentially along second direction 120 alternative arrangements. And each odd-numbered scan lines 202a, each odd number are reseted holding wire 204a, eachOdd number drive voltage line 206a, each even number drive voltage line 206b, each even number are reseted holding wire 204b and each even-line interlace line202b is sequentially along second direction 120 alternative arrangements. By this, the structure in the pixel region 102c of two adjacent columns is with first direction118 are mirror symmetry.
In sum, each pixel of OLED of the present invention can only be used three transistor AND gate one electric capacityReach and drive Organic Light Emitting Diode 130, and compensate the skew of the critical voltage that transistor seconds produces, can effectively fall by thisLow number of transistors, and can reduce the shared area of transistor, therefore the aperture opening ratio of each pixel can effectively promote. And, thisBright OLED more can not include a high-voltage power-line, and more effectively reduction configures circuit, therefore also can promoteThe aperture opening ratio of each pixel.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change withModify, all should belong to covering scope of the present invention.
Claims (15)
1. drive a method for the drive circuit of OLED, this drive circuit includes multiple pixels and a controlElement processed, and respectively this pixel packets contains a first transistor, a transistor seconds, one the 3rd transistor, an electric capacity and one and hasOLED, wherein this control element is electrically connected to the first end of described transistor seconds, and the method includes:
Provide respectively a reference voltage to fill being electrically connected to the respectively first end of respectively this electric capacity of the control end of this transistor secondsElectricity, and provide one to reset voltage to being electrically connected to the second end of each this transistor seconds and each this Organic Light Emitting DiodeThe second end electric discharge of respectively this electric capacity of anode, correctly to write a data voltage that drives new picture;
Stop the respectively electric discharge of the second end of this electric capacity, and utilize this control element provide a drive voltage signal to respectively this secondTransistorized first end, to charge to being electrically connected to respectively the second end of respectively this electric capacity of the second end of this transistor seconds;
Utilize respectively this data voltage to the respectively first end charging of this electric capacity, and stop providing this drive voltage signal; And
Suspension joint is the first end of this electric capacity respectively, and drives described Organic Light Emitting Diode;
Wherein, this drive voltage signal include reset period, a critical voltage compensation period, data write the period andOne luminous period, reseting this drive voltage signal of period at this is logic low level, at critical voltage compensation this driving electricity of periodPress signal system to be converted to logic high levle from logic low level, write this drive voltage signal of period in data and be converted to logic lowLevel, is converted to logic high levle in this drive voltage signal of luminous period from logic low level.
2. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, divides and you can well imagineSupply respectively this reference voltage to include the step of the respectively first end charging of this electric capacity:
Open described the first transistor; And
Provide respectively respectively this reference voltage to the each first end of this first transistor, with to being electrically connected each this first transistorThe first end charging of respectively this electric capacity of the second end.
3. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, this is providedReseting voltage includes the step of respectively this second end electric discharge of this electric capacity:
Open respectively the 3rd transistor; And
Provide this to reset voltage to each the 3rd transistorized first end, with to being electrically connected respectively the 3rd transistorized the second endThis second end electric discharge of respectively this electric capacity.
4. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, stops eachThe step of the electric discharge of this of this electric capacity the second end includes closes respectively the 3rd transistor.
5. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, respectively profitThe step of respectively this first end charging of this electric capacity is included with each this data voltage:
Open described the first transistor; And
Provide respectively respectively this data voltage to the each first end of this first transistor, with to being electrically connected each this first transistorThis first end charging of respectively this electric capacity of the second end.
6. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, suspension joint is eachThe step of the first end of this electric capacity includes closes described the first transistor.
7. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, drives instituteThe step of stating Organic Light Emitting Diode includes utilizes this control element that extremely respectively this transistor seconds of this drive voltage signal is providedFirst end, to drive respectively this Organic Light Emitting Diode by each this transistor seconds.
8. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, respectively this numberBe greater than respectively this reference voltage according to voltage.
9. the method for the drive circuit of driving OLED according to claim 1, is characterized in that, described in haveThe negative electrode of OLED is electrically connected to a low-voltage, and this is reseted voltage and is less than this low-voltage.
10. an OLED, includes:
One substrate;
Many data wires, are sequentially arranged on this substrate along a first direction, and respectively this data wire is used for transmitting one with reference to electricityPress or a data voltage, described data voltage drives new picture in order to correctly to write;
Reset pressure-wire for many, be sequentially arranged on this substrate along this first direction, and respectively this resets pressure-wire for transmittingOne resets voltage;
Multi-strip scanning line, is arranged on this substrate along a second direction that is different from this first direction, for transmitting one scanSignal;
Many drive voltage line, are arranged on this substrate along this second direction, for transmitting a drive voltage signal;
Reset holding wire for many, be arranged on this substrate along this second direction, reset signal for transmitting one; And
Multiple pixels, are an array mode and are arranged on this substrate, and respectively this data wire, respectively this resets pressure-wire, respectively this scanningLine and each this drive voltage line are around each this pixel, and respectively this pixel packets contains:
One the first transistor, is arranged on this substrate, and has a first end and be electrically connected to this corresponding data wire, oneTwo ends and a control end are electrically connected to this corresponding scan line;
One transistor seconds, is arranged on this substrate, and have a first end be electrically connected to this corresponding drive voltage line,One second end and a control end are electrically connected to the second end of this first transistor;
One the 3rd transistor, is arranged on this substrate, and have a first end be electrically connected to corresponding this reset pressure-wire,One second end is electrically connected to the second end of this transistor seconds and a control end and is electrically connected to corresponding this and resets letterNumber line;
One electric capacity, is arranged on this substrate, and has a first end and be electrically connected to second end and of this first transistorThe second end is electrically connected to the 3rd transistorized the second end; And
One Organic Light Emitting Diode, is arranged on this substrate, and has an anode and be electrically connected to second of this transistor secondsEnd is electrically connected to a low-tension supply with a negative electrode;
Wherein, this drive voltage signal include reset period, a critical voltage compensation period, data write the period andOne luminous period, reseting this drive voltage signal of period at this is logic low level, at critical voltage compensation this driving electricity of periodPress signal system to be converted to logic high levle from logic low level, write this drive voltage signal of period in data and be converted to logic lowLevel, is converted to logic high levle in this drive voltage signal of luminous period from logic low level.
11. OLED according to claim 10, is characterized in that, this OLED does not includeOne high-voltage power-line.
12. OLED according to claim 10, is characterized in that, separately include multiple driving chips, electricityProperty be connected to described drive voltage line, and described driving chip provides this drive voltage signal to described drive voltage line.
13. OLED according to claim 10, is characterized in that, separately include multiple grids and drive coreSheet, described grid drive chip is electrically connected to described scan line, in order to provide this sweep signal to described scan line, and described inDescribed in being electrically connected to, grid drive chip resets holding wire, in order to provide this to reset holding wire described in resetting signal to.
The drive circuit of 14. 1 kinds of OLED, includes:
Multiple pixels, respectively this pixel packets contains:
One the first transistor, has a first end for receiving a data voltage or a reference voltage, one second end and a controlSystem end is used for receiving one scan signal, and described data voltage drives new picture in order to correctly to write;
One transistor seconds, has a first end electrical for receiving a drive voltage signal, one second end and a control endBe connected to this second end of this first transistor;
One the 3rd transistor, has that a first end one is reseted voltage for receiving, one second end is electrically connected to this second crystalThis of pipe the second end and a control end are used for receiving one and reset signal;
One electric capacity, have a first end and be electrically connected to this second end of this first transistor, and one second end is electrically connectedTo this second end of the 3rd transistorized this second end and this transistor seconds; And
One Organic Light Emitting Diode, has this second end and the negative electrode that an anode is electrically connected to this transistor seconds and electrically connectsBe connected to a low-tension supply; And
One control element, is electrically connected to the described first end of described transistor seconds, for this drive voltage signal is provided;
Wherein, this drive voltage signal include reset period, a critical voltage compensation period, data write the period andOne luminous period, reseting this drive voltage signal of period at this is logic low level, at critical voltage compensation this driving electricity of periodPress signal system to be converted to logic high levle from logic low level, write this drive voltage signal of period in data and be converted to logic lowLevel, is converted to logic high levle in this drive voltage signal of luminous period from logic low level.
The drive circuit of 15. OLED according to claim 14, is characterized in that, this control element is oneGrid drive chip.
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| TW101137477A TWI460706B (en) | 2012-10-11 | 2012-10-11 | Organic light-emitting display and driving circuit thereof and method of driving the same |
| TW101137477 | 2012-10-11 |
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| CN103839520B (en) | 2014-02-28 | 2017-01-18 | 京东方科技集团股份有限公司 | Pixel circuit, method for driving pixel circuit, display panel and display device |
| CN104778925B (en) * | 2015-05-08 | 2019-01-01 | 京东方科技集团股份有限公司 | OLED pixel circuit, display device and control method |
| CN106023892B (en) | 2016-08-03 | 2019-01-18 | 京东方科技集团股份有限公司 | The driving method of organic light-emitting display device |
| CN106448553B (en) * | 2016-11-29 | 2018-10-23 | 京东方科技集团股份有限公司 | Display base plate, display device and display control method |
| CN107170366B (en) * | 2017-07-21 | 2020-04-17 | 厦门天马微电子有限公司 | Display panel and display device |
| CN107301845A (en) * | 2017-08-23 | 2017-10-27 | 深圳市华星光电半导体显示技术有限公司 | Pixel-driving circuit and its driving method |
| TWI669700B (en) * | 2018-07-26 | 2019-08-21 | 友達光電股份有限公司 | Pixel circuit and display panel |
| TWI666625B (en) * | 2018-08-02 | 2019-07-21 | 友達光電股份有限公司 | Display panel and display panel driving method |
| TWI725768B (en) * | 2020-03-12 | 2021-04-21 | 友達光電股份有限公司 | Light emitting element driving circuit and related display panel |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1870095A (en) * | 2006-06-09 | 2006-11-29 | 广辉电子股份有限公司 | Panel module and its electric saving method |
| CN101029984A (en) * | 2007-04-11 | 2007-09-05 | 友达光电股份有限公司 | Crystal-liquid display device and its pulse-wave adjusting circuit |
| TW201137823A (en) * | 2010-04-16 | 2011-11-01 | Au Optronics Corp | Pixel circuit relating to organic light emitting diode and display using the same and driving method thereof |
| CN202167995U (en) * | 2011-07-20 | 2012-03-14 | 日银Imp微电子有限公司 | Intelligent power module for three-phase bridge drive |
| TW201218163A (en) * | 2010-10-22 | 2012-05-01 | Au Optronics Corp | Driving circuit for pixels of an active matrix organic light-emitting diode display and method for driving pixels of an active matrix organic light-emitting diode display |
| CN102436793A (en) * | 2011-11-18 | 2012-05-02 | 友达光电股份有限公司 | Pixel circuit and driving method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI397887B (en) * | 2009-12-31 | 2013-06-01 | Au Optronics Corp | Driving device of light emitting unit |
| KR101871188B1 (en) * | 2011-02-17 | 2018-06-28 | 삼성디스플레이 주식회사 | Organic Light Emitting Display and Driving Method Thereof |
| KR101860860B1 (en) * | 2011-03-16 | 2018-07-02 | 삼성디스플레이 주식회사 | Organic Light Emitting Display and Driving Method Thereof |
-
2012
- 2012-10-11 TW TW101137477A patent/TWI460706B/en active
- 2012-12-11 CN CN201210531713.1A patent/CN102945654B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1870095A (en) * | 2006-06-09 | 2006-11-29 | 广辉电子股份有限公司 | Panel module and its electric saving method |
| CN101029984A (en) * | 2007-04-11 | 2007-09-05 | 友达光电股份有限公司 | Crystal-liquid display device and its pulse-wave adjusting circuit |
| TW201137823A (en) * | 2010-04-16 | 2011-11-01 | Au Optronics Corp | Pixel circuit relating to organic light emitting diode and display using the same and driving method thereof |
| TW201218163A (en) * | 2010-10-22 | 2012-05-01 | Au Optronics Corp | Driving circuit for pixels of an active matrix organic light-emitting diode display and method for driving pixels of an active matrix organic light-emitting diode display |
| CN202167995U (en) * | 2011-07-20 | 2012-03-14 | 日银Imp微电子有限公司 | Intelligent power module for three-phase bridge drive |
| CN102436793A (en) * | 2011-11-18 | 2012-05-02 | 友达光电股份有限公司 | Pixel circuit and driving method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI460706B (en) | 2014-11-11 |
| TW201415442A (en) | 2014-04-16 |
| CN102945654A (en) | 2013-02-27 |
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