CN102945654A - 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 organic light emitting display and its driving circuit with and driving method, the method that espespecially a kind of each pixel has three transistorized organic light emitting display and its driving circuit and drives this driving circuit.
[background technology]
In recent years, Organic Light Emitting Diode (organic light-emitting display, OLED) display becomes popular emerging flat-panel screens gradually, because have that autoluminescence, wide viewing angle, reaction time are fast, high-luminous-efficiency, low operating voltage, plate thickness are thin, can be made into the advantages such as flexibility panel and processing procedure are simple, therefore be widely used in various planes and shown on the products.
The pixel system of tradition organic light emitting display controls and the Organic Light Emitting Diode that drives as display unit with a switching transistor and a driving transistors.Yet, driving transistors after long-time the use, the skew that can produce critical voltage.And when organic light emitting display display frame, the position of each driving transistors is not identical with the running time, so that the side-play amount of the critical voltage of each driving transistors also can be different.Moreover the drive current system of Organic Light Emitting Diode and the grid of driving transistors and the voltage difference of source electrode and the difference of critical voltage are a square proportional relation.Thus, when the pixel reception of zones of different has the pixel data of identical voltage, because the difference of the critical voltage of driving transistors, so that in these pixels, the value of drive current that is provided to Organic Light Emitting Diode is inconsistent, the brightness that has caused Organic Light Emitting Diode to produce when receiving the voltage of same pixel data is different, thereby so that the picture that organic light emitting display shows is inhomogeneous.
Therefore, existing development drives Organic Light Emitting Diode for increasing by a compensating circuit in each pixel to utilize two electric capacity of four transistor AND gates, and the error of compensation 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, promote the aperture opening ratio of the pixel of organic light emitting display, and keep the real target of making great efforts for industry of the homogeneity of shown picture.
[summary of the invention]
One of fundamental purpose of the present invention is the method that a kind of organic light emitting display, its driving circuit is provided and drives its driving circuit, with the aperture opening ratio of the pixel that promotes organic light emitting display.
In order to achieve the above object, the invention provides a kind of method that drives the driving circuit of organic light emitting display.Driving circuit includes a plurality of pixels and a control element, and each pixel packets contains a first transistor, a transistor seconds, one the 3rd transistor, an electric capacity and an Organic Light Emitting Diode, and wherein control element is electrically connected to the first end of transistor seconds.At first, the first end charging of each electric capacity of the control end of one reference voltage to being electrically connected to each transistor seconds is provided respectively, and provides one to reset voltage the second end of being electrically connected to each transistor seconds the second end with each electric capacity of the anode of each Organic Light Emitting Diode is discharged.Then, stop the discharge of the second end of each electric capacity, and utilize control element that the first end of one drive voltage signal to each transistor seconds is provided, with the second end charging to each electric capacity of the second end of being electrically connected to each transistor seconds.Subsequently, utilize respectively a data voltage to the first end charging of each electric capacity, and stop to provide drive voltage signal.Then, the first end of 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 organic light emitting display, include a substrate, many data lines, many reset pressure-wire, multi-strip scanning line, many drive voltage line, many reset signal wire and a plurality of pixel.Data line sequentially is arranged on the substrate along a first direction, and each data line is used for transmitting a reference voltage or a data voltage.Reset pressure-wire and sequentially be arranged on the substrate along this first direction, and respectively reset pressure-wire and reset voltage for transmitting one.Sweep trace is arranged on the substrate along a second direction that is different from first direction, is used for transmitting the one scan signal.Drive voltage line is arranged on this substrate along second direction, is used for transmitting a drive voltage signal.Reset signal wire and be arranged on the substrate along second direction, be used for transmitting one and reset signal.Pixel is an array mode and is arranged on the substrate, and each data line, respectively resets pressure-wire, each sweep trace and each drive voltage line around each pixel.Each pixel packets contains a first transistor, a transistor seconds, one the 3rd transistor, an electric capacity and an Organic Light Emitting Diode.The first transistor is arranged on the substrate, and has a first end and be electrically connected to corresponding data line, one second end and a control end and be electrically connected to corresponding sweep trace.Transistor seconds is arranged on the substrate, and has a first end and be electrically connected to the second end that corresponding drive voltage line, one second end and a control end are electrically connected to the first transistor.The 3rd transistor is arranged on the substrate, and has a first end and be electrically connected to and corresponding reset the second end and the control end that pressure-wire, one second end be electrically connected to transistor seconds and be electrically connected to the corresponding signal wire of reseting.Electric capacity is arranged on the substrate, and has the second end and one second end that a first end is electrically connected to the first transistor and be electrically connected to the 3rd transistorized the second end.Organic Light Emitting Diode is arranged on the substrate, and has the second end and the negative electrode that an anode is electrically connected to transistor seconds and be electrically connected to a low-tension supply.
In order to achieve the above object, the invention provides a kind of driving circuit of organic light emitting display, include a plurality of pixels and a control element.Each pixel packets contains a first transistor, a transistor seconds, one the 3rd transistor, an electric capacity and an Organic Light Emitting Diode.The first transistor has a first end and is used for receiving the one scan signal for receiving a data voltage or a reference voltage, one second end and a control end.Transistor seconds has a first end and is used for receiving the second end that a drive voltage signal, one second end and a control end are electrically connected to the first transistor.The 3rd transistor has a first end and be used for to receive one and reset voltage, one second end and be electrically connected to the second end of transistor seconds and a control end and be used for receiving one and reset signal.Electric capacity has the second end that a first end is electrically connected to the first transistor, and one second end is electrically connected to the second end of the 3rd transistorized the second end and transistor seconds.Organic Light Emitting Diode has the second end and the negative electrode that an anode is electrically connected to transistor seconds and is electrically connected to a low-tension supply.Control element is electrically connected to the first end of transistor seconds, is used for providing drive voltage signal.
Each pixel of organic light emitting display of the present invention can only be used three transistor AND gate one electric capacity to reach and drive Organic Light Emitting Diode 130, and the skew of the critical voltage that produces of compensation transistor seconds, can effectively reduce number of transistors by this, and can reduce the shared area of transistor, so the aperture opening ratio of each pixel can promote effectively.
[description of drawings]
Fig. 1 be first embodiment of the invention organic light emitting display on look schematic diagram.
Fig. 2 is that Fig. 1 is in the enlarged diagram of regional A.
Fig. 3 be first embodiment of the invention organic light emitting display each pixel region on look schematic diagram.
Fig. 4 is the driving circuit schematic diagram of the organic light emitting display of the first embodiment of the invention pixel that is positioned at same row.
Fig. 5 is the driving method process flow diagram of driving circuit of the organic light emitting display of first embodiment of the invention.
Fig. 6 is data-signal of the present invention, sweep signal, drive voltage signal and resets the schematic diagram in the time sequential routine of signal.
Fig. 7 be second embodiment of the invention organic light emitting display on look schematic diagram.
[main element symbol description]
100 organic light emitting display, 102 substrates
102b surrounding zone, 102a viewing area
104 data lines 106 are reseted pressure-wire
108 sweep traces 110 are reseted signal wire
112 drive voltage line, 114 pixels
116a the first control element 116b the second control element
118 first directions, 120 second directions
122 the first transistor 122a first grids
122b the first source electrode 122c the first drain electrode
122d the first semiconductor layer 124 transistor secondses
124a second grid 124b the second source electrode
124c the second drain electrode 124d the second semiconductor layer
126 the 3rd transistor 126a the 3rd grid
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
134 first perforation of 132 low-tension supplies
136 second perforation, 200 organic light emitting display
202 sweep trace 202a odd-numbered scan lines
202b even-line interlace line 204 is reseted signal wire
The 204a odd number is reseted signal wire 204b even number and is reseted signal wire
206 drive voltage line 206a odd number drive voltage line
206b even number drive voltage line C1 first end
C2 the second end D1 the second end
D2 the 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
[embodiment]
Please refer to Fig. 1, Fig. 1 be first embodiment of the invention organic light emitting display on look schematic diagram, and Fig. 2 is that Fig. 1 is in the enlarged diagram of regional A.As shown in Figure 1, organic light emitting display 100 includes a substrate 102, such as: the transparency carriers such as glass, plastic cement or quartz, and substrate 102 has a viewing area 102a and a surrounding zone 102b around viewing area 102a.Viewing area 102a system is used for display frame, and the substrate 102 of viewing area 102a has a plurality of pixel region 102c that arrange in an array mode, but is not limited to this.And surrounding zone 102b system is used for peripheral circuit and control element are set, and the substrate 102 of surrounding zone 102b has a plurality of fanout areas (fan out region) 102d, in order to the circuit that extends to surrounding zone 102b from viewing area 102a to be set.In addition, organic light emitting display 100 includes in addition many data lines 104, many and resets pressure-wire 106, multi-strip scanning line 108, many and reset signal wire 110 and many drive voltage line 112, a plurality of pixel 114, a plurality of the first control element 116a and a plurality of the second control element 116b.Wherein, each first control element 116a is arranged on the substrate 102 of surrounding zone 102b, and with corresponding data line 104 with reset pressure-wire 106 and be electrically connected, and each first control element 116a can be respectively a data driving chip, for example: be integrated with data drive circuit and the driving chip of reseting Voltag driving circuit, to be used for providing a respectively data-signal, for example: a reference voltage or a data voltage, to each data line 104, and provide respectively one to reset voltage to respectively reseting pressure-wire 106, but be not limited to this.Each second control element 116b is arranged on the substrate 102 of surrounding zone 102b, and with corresponding sweep trace 108, drive voltage line 112 with reset signal wire 110 and be electrically connected, and each second control element 116b can be respectively one and drive chip, for example be integrated with scan drive circuit, drive voltage circuit and the grid drive chip of reseting signal drive circuit, to be used for providing the one scan signal to each sweep trace 108 respectively, provide respectively a drive voltage signal to each drive voltage line 112 and provide respectively one to reset signal to and respectively reset signal wire 110, but the invention is not restricted to this.And each data linear system is used for data signal to each pixel 114.Respectively reset pressure-wire 106 and reset voltage to each pixel 114 for transmitting.Each sweep trace 108 is used for transmitting sweep signal to each pixel 114.Each drive voltage line is used for transmitting drive voltage signal to each pixel 114.Respectively reset signal wire 110 transmission and reset signal to each pixel 114.The first control element of the present invention and the second control element are not limited to above-mentioned driving chip, also can be other control chips.In other embodiment of the present invention, the drive voltage signal of each drive voltage line also can provide by other driving chips different from grid drive chip.
In the present embodiment, each data line 104 with respectively reset pressure-wire 106 sequentially along a first direction 118 alternative arrangements on substrate 102, and extend to from viewing area 102a on the substrate 102 of fanout area 102d, to be electrically connected with the first control element 116a.Each sweep trace 108, each drive voltage line 112 and respectively reset signal wire 110 and sequentially be different from second direction 120 alternative arrangements of first direction 118 on substrate 102 along one, and with each data line 104 and respectively to reset pressure-wire 106 interlaced, and extend to from viewing area 102a on the substrate 102 of fanout area 102d, to be electrically connected with the second control element 116b.And each pixel 114 is on the substrate 102 that is arranged at respectively in each pixel region 102c, and by each data line 104, respectively reset 112 of pressure-wire 106, each sweep trace 108 and each drive voltage line around.
As shown in Figure 2, each second control element 116b has a plurality of connection pad 116c, correspondingly respectively extend to each sweep trace 108, each drive voltage line 112 of the second control element 116b below and respectively reset signal wire 110, and each connection pad 116c by welding manner respectively with each sweep trace 108, each drive voltage line 112 and respectively reset signal wire 110 and be electrically connected.
Below will further describe the pixel of the present embodiment.Please refer to Fig. 3 and Fig. 4, Fig. 3 be first embodiment of the invention organic light emitting display each pixel region on look schematic diagram, and Fig. 4 is the driving circuit schematic diagram that the organic light emitting display of first embodiment of the invention is positioned at the pixel of same row.As shown in Figure 3 and Figure 4, each pixel 114 includes a first transistor 122, transistor seconds 124, one the 3rd transistor 126, an electric capacity 128 and an Organic Light Emitting Diode 130.The first transistor 122 has a first grid 122a and drains 122c as one second end D1 and one first semiconductor layer 122d as a control end G1, one first source electrode 122b as a first end S1, one first.Transistor seconds 124 has a second grid 124a and drains 124c as one second end D2 and one second semiconductor layer 124d as a control end G2, one second source electrode 124b as a first end S2, one second.The 3rd transistor 126 has one the 3rd grid 126a and drains 126c as one second end D3 and one the 3rd semiconductor layer 126d as a control end G3, one the 3rd source electrode 126b as a first end S3, the 3rd.And electric capacity 128 has two electrodes, respectively as a first end C1 and one second end C2.Moreover Organic Light Emitting Diode 130 has an anode 130a, a negative electrode 130b and a luminescent layer 130c.
In each the first transistor 122, control end G1 is electrically connected with corresponding sweep trace 108, be used for receiving sweep signal, first end S1 is electrically connected with corresponding data line 104, be used for reception of data signal, and the first end C1 electric connection of the control end G2 of the second end D1 and transistor seconds 124, electric capacity 128.In each transistor seconds 124, first end S2 is electrically connected with corresponding drive voltage line 112, be used for receiving drive voltage signal, and the anode 130a of the second end D2 and each Organic Light Emitting Diode 130, the second end C2 of electric capacity 128 and the second end D3 electric connection of the 3rd transistor 126.In the 3rd transistor 126, control end G3 is electrically connected with reseting signal wire 110, be used for receiving and reset signal, and first end S3 is electrically connected with reseting pressure-wire 106, is used for receiving and resets voltage.And, the negative electrode 130b of Organic Light Emitting Diode 130 is electrically connected to be used to the low-tension supply 132 that a low-voltage is provided, and Organic Light Emitting Diode 130 has a stray capacitance 130d in addition, is electrically connected between the anode 130a and negative electrode 130b of Organic Light Emitting Diode 130.
In the present embodiment, sweep trace 108, first grid 122a, second grid 124a, reset signal wire 110, the 3rd grid 126a and drive voltage line 112 and formed by a first metal layer, wherein, sweep trace 108 is connected with first grid 122a, and resets signal wire 110 and be connected with the 3rd grid 126a.And the part of second grid 124a is as the electrode of electric capacity 128 first end C1.In addition, data line 104, the first source electrode 122b, the first drain electrode 122c, the second drain electrode 124c, the 3rd drain electrode 126c, the second source electrode 124b, reset pressure-wire 106, the 3rd source electrode 126b system is formed by one second metal level.Wherein, data line 104 is connected with the first source electrode 122b.The second drain electrode 124c is connected with the 3rd drain electrode 126c, and the part of the second drain electrode 124c 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 electrode 122c system is electrically connected with second grid 124a by one first perforation 134, and the second drain electrode 124b system is electrically connected by one second perforation 136 and drive voltage line 112.The first semiconductor layer 122d system is arranged between first grid 122a and the first source electrode 122b and the first drain electrode 122c.The second semiconductor layer 124d system is arranged between second grid 124a and the second source electrode 124b and the second drain electrode 124c.The 3rd semiconductor layer 126d system is arranged between the 3rd grid 126a and the 3rd source electrode 126b and the 3rd drain electrode 126c.In addition, the anode 130a of Organic Light Emitting Diode 130, luminescent layer 130c and negative electrode 130b sequentially are stacked on the second drain electrode 124c.It should be noted that, the organic light emitting display 100 of the present embodiment does not include a high-voltage power-line, and each pixel only uses three transistors can reach the effect of the skew that drives Organic Light Emitting Diode 130 and compensation transistor critical voltage, and then can keep the homogeneity of shown picture.
The driving method of driving circuit of the organic light emitting display of the present embodiment below will be described in further detail, to reach the effect of only using three transistor driving Organic Light Emitting Diodes.And, for the driving method of the driving circuit that clearly demonstrates each row pixel, below do description as an example of same row pixel example, but the present invention being not limited to this, the driving circuit of different lines pixel of the present invention 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 driving method process flow diagram of driving circuit of the organic light emitting display of first embodiment of the invention, and Fig. 6 is data-signal of the present invention, sweep signal, drive voltage signal and resets the schematic diagram in the time sequential routine of signal.To shown in Figure 6, the driving method of the driving circuit of the organic light emitting display of the present embodiment includes such as Fig. 4:
Step S10: the first end C1 charging of each electric capacity 128 of the control end G2 of reference voltage Vref to being electrically connected to each transistor seconds 124 is provided respectively, and provides and reset voltage Vreset the second end D2 of being electrically connected to each transistor seconds 124 and the second end C2 of each electric capacity 128 of the anode 130a of each Organic Light Emitting Diode 130 are discharged;
Step S12: stop the discharge of the second end C2 of each electric capacity 128, and utilize the second control element 116b that the first end S2 of drive voltage signal EM to each transistor seconds 124 is provided, with the second end C2 charging to each electric capacity 128 of the second end D2 of being electrically connected to each transistor seconds 124;
Step S14: utilize respectively data voltage Vdata to the first end C1 charging of each electric capacity 128, and stop to provide drive voltage signal EM; And
Step S16: the first end C1 of each electric capacity 128 of suspension joint, and drive Organic Light Emitting Diode 130.And, sweep signal Sscan, data-signal Sdata to the driving circuit of organic light emitting display 100 are provided, reset signal Sreset and drive voltage signal EM consist predominantly of one reset period TD1, critical voltage compensation period TD2, data write period TD3 and a luminous period TD4, and to reset voltage Vsus be dc voltage.
In step S10, the driving circuit system of organic light emitting display 100 operates in and resets period TD1, and sweep signal Sscan and data-signal Sdata are complementary signal, that is, sweep signal Sscan and data-signal Sdata have same frequency, but the phase differential with 180 degree, so that when sweep signal is the logic high levle, data-signal is reference voltage, and when sweep signal is the logic low level, data-signal is the data voltage for display frame, and data voltage is greater than reference voltage.Therefore, in reseting period TD1, when sweep signal is the logic high levle, each the first transistor 122 of same row pixel is unlocked, and because the first end S1 of each the first transistor 122 is electrically connected to each data line, so that provide to the reference voltage Vref of each data-signal Sdata of the first end S1 of each the first transistor 122 can be by the second end D1 charging of 122 pairs of each the first transistors 122 of each the first transistor, that is to the first end C1 charging of each electric capacity 128.Simultaneously, in reseting period TD1, reseting signal Sreset is the logic high levle, and drive voltage signal EM is the logic low level, therefore each the 3rd transistor 126 of same row pixel can be unlocked, and because the first end S3 of each the 3rd transistor 126 is electrically connected to and respectively resets pressure-wire so that provide to the voltage Vsus that respectively resets of the first end S3 of each the 3rd transistor 126 can be to the second end D3 discharge of each the 3rd transistor 126, that is to the second end C2 discharge of each electric capacity 128.Hence one can see that, in reseting period TD1, each electric capacity 128 is to utilize reference voltage Vref and reset voltage Vsus the voltage of first end C1 and the second end C2 is done the action that resets (reset), and purpose is that the data voltage Vdata that drives new picture in order to allow can correctly write.At this moment, the voltage of the first end C1 of each electric capacity 128 is 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 electrically connected to low-voltage, and resets voltage Vsus system less than low-voltage, can discharge by the second end C2 to electric capacity 128 in reseting period TD1 so that reset voltage Vsus.In the present embodiment, sweep signal Sscan has a plurality of logic high levle periods and a plurality of logic low level period in reseting period TD1, and data-signal Sdata has a plurality of reference voltage periods and a plurality of data voltage period in reseting period TD1, but the present invention is not limited to this, in other embodiment of the present invention, sweep signal also can only have the unity logic high levle in reseting the period, and data-signal then only has the single reference voltage period.
In step S12, the driving circuit of organic light emitting display 100 system operates in critical voltage compensation period TD2.At this moment, sweep signal Sscan and data-signal Sdata system is with to reset period TD1 identical, therefore reference voltage Vref is still charged to the first end C1 of each electric capacity 128, so that the voltage of the control end G2 of each transistor seconds 124 can be reference voltage Vref, and open each transistor seconds 124 by reference voltage Vref.Simultaneously, reset signal Sre set and be converted to the logic low level, so that the second end C2 of each electric capacity 128 presents floating because each the 3rd transistor 126 is closed, and then stop the second end C2 of each electric capacity 128 is discharged.But, drive voltage signal EM system is converted to the logic high levle from the logic low level, and because each transistor seconds 124 is in opening, so the voltage of the second end C2 of each electric capacity 128 system is decided by drive voltage signal EM, and drive voltage signal EM can be to the second end C2 charging of each electric capacity 128 of the second end D2 of being electrically connected to 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 the driven voltage signal EM of voltage of the second end D2 of each transistor seconds 124 is charged to Vref-Vt, each transistor seconds 124 can be closed, and drives the electric current I of Organic Light Emitting Diode
OLEDReduce to zero.At this moment, the voltage of the second end D2 of each transistor seconds 124 can determine according to following equation:
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 (threshold voltage) of each transistor seconds 124.
In step S14, the driving circuit of organic light emitting display 100 system operates in data and writes period TD3.At this moment, sweep signal Sscan is not complementary with data-signal Sdata, and when sweep signal S scan is the logic high levle, data-signal Sdata can be data voltage Vdata, and each the first transistor 122 can be in opening so that provide to each data voltage Vdata of the first end S1 of each the first transistor 122 can be respectively to the first end C1 charging of each electric capacity 128.By this, the voltage of the control end G2 of each transistor seconds 124 can be respectively each data voltage Vdata.And, write among the period TD3 in data, reset signal Sreset and still be in the logic low level, and drive voltage signal EM is converted to the logic low level, to stop to provide drive voltage signal to each transistor seconds 124.It is worth mentioning that, data voltage Vdata drives the electric current I of Organic Light Emitting Diode 130 by the control end G2 control of transistor seconds 122
OLEDSize, and electric current I
OLEDSize be the GTG value of corresponding Organic Light Emitting Diode 130.Therefore, when data-signal Sdata is converted to data voltage Vdata from reference voltage Vref, and the second end C2 of electric capacity 128 system is when being floating, the voltage V of the second end D2 of transistor seconds 124
SCan determine according to following equation:
V
S=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 stray capacitance 130c.
In step S16, the driving circuit of organic light emitting display 100 system operates in luminous period TD4.At this moment, sweep signal Sscan system is converted to the logic low level, so that each the first transistor 124 is closed, and the first end C1 of each electric capacity 128 of suspension joint.Therefore, the voltage of the first end C1 of each electric capacity 128 is data voltage Vdata still, makes transistor seconds 124 still be opening.Simultaneously, drive voltage signal EM is converted to the logic high levle, and because the first end S2 of each transistor seconds 124 is electrically connected to drive voltage line, therefore provides to the drive voltage signal EM of the first end S2 of each transistor seconds 124 and can drive each Organic Light Emitting Diode 130 by each transistor seconds 124 from the second control element 116b.At this moment, the voltage V of the control end G2 of each transistor seconds 124
GAnd the voltage V of the second end S2 of each transistor seconds 124
SCan determine according to following equation:
V
G=Vdata+Vt-Vref-a(Vdata-Vref)+OVSS+VOLED ，
V
s=OVSS+VOLED；
Wherein:
V
GBe 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 the control end G2 of each transistor seconds 124 and the voltage VS of the second end S2 are all known, so the voltage difference VGS of the control end G2 of each transistor seconds 124 and the second end S2 can determine according to following equation:
V
GS=V
G-V
S
=Vdata+Vt-Vref-a(Vdata-Vref)+OVSS+VOLED
-OVSS-VOLED
=(1-a)(Vdata-Vref)+Vt
Therefore, the electric current I OLED that drives Organic Light Emitting Diode this moment can determine according to following equation:
I
OLED=k(V
GS-Vt)
2=k[(1-a)(Vdata-Vref)]
2
Hence one can see that, has nothing to do by the electric current I OLED of each Organic Light Emitting Diode and critical voltage Vt and the low-voltage OVSS of transistor seconds 124.
From the above, the organic light emitting display 100 of the present embodiment can be utilized above-mentioned driving method, and three transistor AND gate one electric capacity of arranging in pairs or groups can reach and drive Organic Light Emitting Diode 130, and the skew of the critical voltage that produces of compensation transistor seconds.By this, each pixel of the organic light emitting display 100 of the present embodiment only need configure three transistor AND gate one electric capacity, and can effectively reduce number of transistors, and can reduce the shared area of transistor, so that the aperture opening ratio of each pixel can effectively promote.And the organic light emitting display 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.
Organic light emitting display of the present invention is not limited with above-described embodiment.Hereinafter will continue to disclose other embodiments of the invention or change shape, so for the purpose of simplifying the description and highlight each embodiment or change difference between the shape hereinafter use same numeral mark similar elements, and no longer counterweight again part give unnecessary details.
Please refer to Fig. 7, Fig. 7 be second embodiment of the invention organic light emitting display on look schematic diagram.As shown in Figure 7, the sweep trace of the present embodiment, to reset signal wire be different with putting in order of the first embodiment from putting in order of drive voltage line.In the present embodiment, the sweep trace 202 of organic light emitting display 200 can be divided into odd-numbered scan lines 202a and even-line interlace line 202b, and each odd-numbered scan lines 202a and each even-line interlace line 202b are sequentially along second direction 120 alternative arrangements.Reset signal wire 204 and can divide into that odd number is reseted signal wire 204a and even number is reseted signal wire 204b, and each odd number is reseted signal wire 204a and each even number is reseted signal wire 204b sequentially along second direction 120 alternative arrangements.Drive voltage line 206 can be divided into odd number 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 line 206b are sequentially along second direction 120 alternative arrangements.And each odd-numbered scan lines 202a, each odd number are reseted signal wire 204a, each odd number drive voltage line 206a, each even number drive voltage line 206b, each even number and are reseted signal wire 204b and each even-line interlace line 202b sequentially along second direction 120 alternative arrangements.By this, the system of the structure in the pixel region 102c of two adjacent columns is mirror symmetry with first direction 118.
In sum, each pixel of organic light emitting display of the present invention can only be used three transistor AND gate one electric capacity to reach and drive Organic Light Emitting Diode 130, and the skew of the critical voltage that produces of compensation transistor seconds, can effectively reduce number of transistors by this, and can reduce the shared area of transistor, so the aperture opening ratio of each pixel can promote effectively.And organic light emitting display of the present invention 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.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (15)
1. method that drives the driving circuit of organic light emitting display, this driving circuit includes a plurality of pixels and a control element, and respectively this pixel packets contains a first transistor, a transistor seconds, one the 3rd transistor, an electric capacity and an Organic Light Emitting Diode, wherein this control element is electrically connected to the first end of described transistor seconds, and the method includes:
One reference voltage is provided respectively, and the first end of respectively this electric capacity of the control end of this transistor seconds charges to being electrically connected to respectively, and provides one to reset voltage to being electrically connected to respectively second end and respectively the second end discharge of respectively this electric capacity of the anode of this Organic Light Emitting Diode of this transistor seconds;
Stop the respectively discharge of the second end of this electric capacity, and utilize this control element that the extremely respectively first end of this transistor seconds of one drive voltage signal is provided, so that the second end of respectively this electric capacity of the second end of this transistor seconds charges to being electrically connected to respectively;
Utilize respectively a data voltage to the respectively first end charging of this electric capacity, and stop to provide this drive voltage signal; And
Suspension joint is the first end of this electric capacity respectively, and drives described Organic Light Emitting Diode.
2. the method for the driving circuit of driving organic light emitting display according to claim 1 is characterized in that, provides respectively this reference voltage respectively that the step of the respectively first end charging of this electric capacity is included:
Open described the first transistor; And
Provide respectively respectively this reference voltage to the first end of this first transistor respectively, with to being electrically connected the respectively first end charging of respectively this electric capacity of the second end of this first transistor.
3. the method for the driving circuit of driving organic light emitting display according to claim 1 is characterized in that, provides this to reset voltage the step of this second end discharge of this electric capacity is respectively included:
Open respectively the 3rd transistor; And
Provide this to reset extremely respectively the 3rd transistorized first end of voltage, so that this second end of respectively this electric capacity of the 3rd transistorized the second end discharges to being electrically connected respectively.
4. the method for the driving circuit of driving organic light emitting display according to claim 1 is characterized in that, the step that stops the respectively discharge of this second end of this electric capacity includes closes respectively the 3rd transistor.
5. the method for the driving circuit of driving organic light emitting display according to claim 1 is characterized in that, utilizes respectively this data voltage respectively that the step of respectively this first end charging of this electric capacity is included: to open described the first transistor; And
Provide respectively respectively this data voltage to the first end of this first transistor respectively, with to being electrically connected respectively this first end charging of respectively this electric capacity of the second end of this first transistor.
6. the method for the driving circuit of driving organic light emitting display according to claim 1 is characterized in that, the suspension joint respectively step of the first end of this electric capacity includes and closes described the first transistor.
7. the method for the driving circuit of driving organic light emitting display according to claim 1, it is characterized in that, the step that drives described Organic Light Emitting Diode includes utilizes this control element that the extremely respectively first end of this transistor seconds of this drive voltage signal is provided, and this transistor seconds drives respectively this Organic Light Emitting Diode to pass through respectively.
8. the method for the driving circuit of driving organic light emitting display according to claim 1 is characterized in that, respectively this data voltage is greater than this reference voltage respectively.
9. the method for the driving circuit of driving organic light emitting display according to claim 1 is characterized in that, the negative electrode of described Organic Light Emitting Diode is electrically connected to a low-voltage, and this resets voltage less than this low-voltage.
10. organic light emitting display includes:
One substrate;
Many data lines sequentially are arranged on this substrate along a first direction, and respectively this data line is used for transmitting a reference voltage or a data voltage;
Reset pressure-wire for many, sequentially be arranged on this substrate along this first direction, and respectively this is reseted pressure-wire and be used for to transmit one and reset voltage;
The multi-strip scanning line is arranged on this substrate along a second direction that is different from this first direction, is used for transmitting the one scan signal;
Many drive voltage line are arranged on this substrate along this second direction, are used for transmitting a drive voltage signal;
Reset signal wire for many, be arranged on this substrate along this second direction, be used for transmitting one and reset signal; And
A plurality of pixels are an array mode and are arranged on this substrate, and respectively this data line, respectively this resets pressure-wire, respectively this sweep trace and this drive voltage line respectively are around this pixel respectively, 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 line, one second end and a control end and be electrically connected to this corresponding sweep trace;
One transistor seconds is arranged on this substrate, and has a first end and be electrically connected to the second end that this corresponding drive voltage line, one second end and a control end are electrically connected to this first transistor;
One the 3rd transistor is arranged on this substrate, and has a first end and be electrically connected to corresponding this and reset pressure-wire, one second end and be electrically connected to the second end of this transistor seconds and a control end and be electrically connected to corresponding this and reset signal wire;
One electric capacity is arranged on this substrate, and has the second end and one second end that a first end is electrically connected to this first transistor and be electrically connected to the 3rd transistorized the second end; And
One Organic Light Emitting Diode is arranged on this substrate, and has the second end and the negative electrode that an anode is electrically connected to this transistor seconds and be electrically connected to a low-tension supply.
11. organic light emitting display according to claim 10 is characterized in that, this organic light emitting display does not include a high-voltage power-line.
12. organic light emitting display according to claim 10 is characterized in that, other includes a plurality of driving chips, is electrically connected to described drive voltage line, and described driving chip provides this drive voltage signal to described drive voltage line.
13. organic light emitting display according to claim 10, it is characterized in that, other includes a plurality of grid drive chip, described grid drive chip is electrically connected to described sweep trace, in order to provide this sweep signal to described sweep trace, and described grid drive chip is electrically connected to the described signal wire of reseting, and resets signal to the described signal wire of reseting in order to this to be provided.
14. the driving circuit of an organic light emitting display includes:
A plurality of pixels, respectively this pixel packets contains:
One the first transistor has a first end and is used for receiving the one scan signal for receiving a data voltage or a reference voltage, one second end and a control end;
One transistor seconds has a first end and is used for receiving this second end that a drive voltage signal, one second end and a control end are electrically connected to this first transistor;
One the 3rd transistor has a first end and be used for to receive one and reset voltage, one second end and be electrically connected to this second end of this transistor seconds and a control end and be used for receiving one and reset signal;
One electric capacity has this second end that a first end is electrically connected to this first transistor, and one second end is electrically connected to 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 is electrically connected to a low-tension supply; And
One control element is electrically connected to the described first end of described transistor seconds, is used for providing this drive voltage signal.
15. the driving circuit of organic light emitting display according to claim 14 is characterized in that, this control element is a grid drive chip.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| TW101137477 | 2012-10-11 | ||
| TW101137477A TWI460706B (en) | 2012-10-11 | 2012-10-11 | Organic light-emitting display and driving circuit thereof and method of driving the same |
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| CN102945654A true CN102945654A (en) | 2013-02-27 |
| CN102945654B CN102945654B (en) | 2016-05-11 |
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Also Published As
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| TWI460706B (en) | 2014-11-11 |
| CN102945654B (en) | 2016-05-11 |
| TW201415442A (en) | 2014-04-16 |
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