CN104299570A - Pixel circuit, drive method thereof, array substrate and display panel - Google Patents

Pixel circuit, drive method thereof, array substrate and display panel Download PDF

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Publication number
CN104299570A
CN104299570A CN201410611987.0A CN201410611987A CN104299570A CN 104299570 A CN104299570 A CN 104299570A CN 201410611987 A CN201410611987 A CN 201410611987A CN 104299570 A CN104299570 A CN 104299570A
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China
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signal
transistor
image
circuit
electrically
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CN201410611987.0A
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Chinese (zh)
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CN104299570B (en
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李元
钱栋
吴桐
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厦门天马微电子有限公司
天马微电子股份有限公司
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Abstract

The invention discloses a pixel circuit, a drive method of the pixel circuit, an array substrate and a display panel. The pixel circuit comprises a first transistor, a second transistor, an organic light-emitting diode and a voltage stabilization unit. According to the pixel circuit, because the voltage stabilization unit is arranged between the second electrode of the first transistor and the grid electrode of the second transistor serving as a driving tube, even through second signals received by a second signal input end are unsteady because of capacitive coupling and electric leakage on the periphery of the pixel circuit or attenuation in one frame of display, steady voltage signals can be obtained after the signals pass through the voltage stabilization unit, the voltage signals are applied to the grid electrode of the second transistor, the second transistor can be stably controlled, and therefore the open second transistor can obtain steady drain electrode current, the current flowing through the organic light-emitting diode can be more stable, and the display effect of the display panel can be improved.

Description

A kind of image element circuit and driving method, array base palte and display panel

Technical field

The present invention relates to display technique field, particularly relate to a kind of image element circuit and driving method, array base palte and display panel.

Background technology

In the image element circuit of display panel, active matrix organic light-emitting diode (Active Matrix Organic Light Emitting Diode, be called for short AMOLED) can luminescence be by thin film transistor (TFT) (the Thin Film Transistor as driving tube, being called for short TFT) drive current that produces in the saturated condition drives, therefore, the display effect of Organic Light Emitting Diode can be affected on the control of driving tube.

Can be divided into analog-driven and digital drive to the type of drive of driving tube, wherein analog-driven can be realized by current signal, and digital drive then can be realized by voltage signal.By applying the voltage signal only with high level and low level two kinds of voltage statuss to driving tube, driving tube can be controlled open or close, further control organic light-emitting diode or stopping luminescence, and then utilize the mode of field sequence to realize the control of gray scale.

Fig. 1 is the structural representation of the image element circuit of prior art.As shown in Figure 1, the image element circuit of prior art comprises NMOS tube N1, PMOS P1, capacitor C0 and Organic Light Emitting Diode D0, wherein, the source electrode of NMOS tube N1 is electrically connected with data signal input SOURCE, the grid of NMOS tube N1 is electrically connected with sweep signal input end GATE, the drain electrode of NMOS tube N1 is electrically connected with the first end of capacitor C0 and the grid of PMOS P1, second end of capacitor C0 and the source electrode of PMOS P1 meet the first power supply PVDD, the drain electrode of PMOS P1 meets second source PVEE by Organic Light Emitting Diode D0, the voltage of described second source PVEE is less than the voltage of described first power supply PVDD.Wherein PMOS P1 in image element circuit as driving tube; Data signal input SOURCE has the data-signal (only having the voltage signal of high level and low level two kinds of voltage statuss) of digital drive function for receiving; Sweep signal input end GATE is for receiving sweep signal; Capacitor C0 plays the effect of memory capacitance, at NMOS tube N1 from after opening becomes closed condition, continues open and make Organic Light Emitting Diode D0 continuous illumination to make PMOS P1.

In the image element circuit shown in Fig. 1, on the one hand, in a frame display, fluctuation is there is because the data-signal being applied to the grid of PMOS P1 can be subject to the capacity coupled impact of this image element circuit periphery in display panel, on the other hand, because electric leakage and data-signal there will be the situations such as decay in a frame display, therefore, data-signal can be caused unstable to the control of PMOS P1, cause the electric current flowing through Organic Light Emitting Diode D0 unstable further, thus the display effect of display panel can be affected.

Summary of the invention

In view of this, the embodiment of the present invention provides a kind of image element circuit and driving method, array base palte and display panel, unstable with the data-signal solving the grid being applied to driving tube in prior art, cause the technical matters of the electric current instability flowing through Organic Light Emitting Diode.

First aspect, the embodiment of the present invention provides a kind of image element circuit, comprising: the first transistor, transistor seconds, Organic Light Emitting Diode and voltage regulation unit;

The grid of described the first transistor is electrically connected with the first signal input part of image element circuit, and the first pole is electrically connected with the secondary signal input end of image element circuit, and the second pole is electrically connected with the grid of described transistor seconds by described voltage regulation unit;

First pole of described transistor seconds is connected with the first power electric, and the second pole is electrically connected with the anode of described Organic Light Emitting Diode;

The negative electrode of described Organic Light Emitting Diode is electrically connected with second source, and the voltage of wherein said second source is less than the voltage of described first power supply;

Wherein, described voltage regulation unit is stablized for keeping the current potential of the grid being applied to described transistor seconds.

Second aspect, the embodiment of the present invention also provides a kind of array base palte, comprises the image element circuit described in above-mentioned first aspect.

The third aspect, the embodiment of the present invention also provides a kind of display panel, comprises the array base palte described in above-mentioned second aspect.

Fourth aspect, the embodiment of the present invention also provides a kind of driving method of image element circuit, and described driving method is performed by the image element circuit described in first aspect, comprising:

First signal controls the first transistor and opens, and the signal that secondary signal exports after voltage regulation unit process controls transistor seconds and opens, and makes organic light-emitting diode;

Described first signal controls described the first transistor and closes, and opens, make described organic light-emitting diode through transistor seconds described in the signal Sustainable Control that described voltage regulation unit exports;

Described first signal controls described the first transistor and opens, and the signal that described secondary signal exports after described voltage regulation unit process controls described transistor seconds and closes, and described Organic Light Emitting Diode is stopped luminous.

The image element circuit that the embodiment of the present invention provides and driving method thereof, array base palte and display panel, by arranging voltage regulation unit between second pole and the grid as the transistor seconds of driving tube of the first transistor, the secondary signal that secondary signal input end receives, even if due to the capacitive coupling being subject to image element circuit periphery, leak electricity or in a frame display, occur the reasons such as decay and produce instability, after voltage regulation unit, stable voltage signal can be obtained, this voltage signal applies the grid of transistor seconds, can stably control transistor seconds, the transistor seconds that can make like this to be under opening obtains stable drain current, make the electric current flowing through Organic Light Emitting Diode more stable, thus the display effect of display panel can be improved.

Accompanying drawing explanation

By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:

Fig. 1 is the structural representation of the image element circuit of prior art;

Fig. 2 is the structural representation of a kind of image element circuit that the embodiment of the present invention provides;

Fig. 3 is the structural representation of the another kind of image element circuit that the embodiment of the present invention provides;

Fig. 4 is the structural representation of another image element circuit that the embodiment of the present invention provides;

Fig. 5 is the structural representation of another image element circuit that the embodiment of the present invention provides;

Fig. 6 is the structural representation of a kind of array base palte that the embodiment of the present invention provides;

Fig. 7 is the structural representation of a kind of display panel that the embodiment of the present invention provides;

Fig. 8 is the schematic flow sheet of the driving method of a kind of image element circuit that the embodiment of the present invention provides;

Fig. 9 is the oscillogram of the voltage signal that in Fig. 3, the first signal input part and secondary signal input end receive.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.

The embodiment of the present invention provides a kind of image element circuit.Fig. 2 is the structural representation of a kind of image element circuit that the embodiment of the present invention provides.As shown in Figure 2, described image element circuit comprises: the first transistor M1, transistor seconds M2, Organic Light Emitting Diode D1 and voltage regulation unit 10; The grid of described the first transistor M1 is electrically connected with the first signal input part S1 of image element circuit, first pole M11 is electrically connected with the secondary signal input end S2 of image element circuit, and the second pole M12 is electrically connected with the grid of described transistor seconds M2 by described voltage regulation unit 10; First pole M21 of described transistor seconds is electrically connected with the first power supply PVDD, and the second pole M22 is electrically connected with the anode of described Organic Light Emitting Diode D1; The negative electrode of described Organic Light Emitting Diode D1 is electrically connected with second source PVEE, and the voltage of wherein said second source PVEE is less than the voltage of described first power supply PVDD; Wherein, described voltage regulation unit 10 is stablized for keeping the current potential of the grid being applied to described transistor seconds M2.

In embodiments of the present invention, described first signal input part S1 receives the first signal, described first signal is pulse signal, and this first signal is applied to the grid of the first transistor M1, is controlled unlatching or the closedown of the first transistor M1 by the change of low and high level; Described secondary signal input end receives secondary signal, described secondary signal is digital signal, wherein, described digital signal is the voltage signal with high level and low level two kinds of voltage statuss, under the first transistor M1 is in opening, described secondary signal, after the process of voltage regulation unit 10, is applied to the grid of transistor seconds M2, then controls unlatching or the closedown of transistor seconds M2 by the change of low and high level.In actual use, the sweep signal that the first signal can produce for scan drive circuit, the data-signal that secondary signal can produce for data drive circuit.

It should be noted that, above-mentioned transistor seconds M2 is the driving tube in image element circuit, for driving, Organic Light Emitting Diode D1 is luminous or stopping is luminous, therefore, by to the unlatching of transistor seconds M2 or the control of closedown, can realize luminous to Organic Light Emitting Diode D1 or stop luminous control.In addition, for the first pole M11 of above-mentioned the first transistor M1, can be set as source electrode or drain electrode, accordingly, its second pole M12 can be set as drain electrode or source electrode; Identical with it, for the first pole M21 of above-mentioned transistor seconds M2, can be set as source electrode or drain electrode, accordingly, its second level M22 can be set as drain electrode or source electrode.

By arranging voltage regulation unit 10 between the second pole M12 and the grid as the transistor seconds M2 of driving tube of the first transistor M1, if as the secondary signal of digital signal owing to being subject to the capacitive coupling of image element circuit periphery, electric leakage or the reason such as appearance decay and produce wild effect in a frame display, after process by voltage regulation unit 10, stable voltage signal can be become, this voltage signal applies the grid of transistor seconds M2, can stably control transistor seconds M2.Because transistor seconds M2 is operated in saturation region under the state of opening, according to the relation of its drain current and gate source voltage, if its grid voltage is stablized (source voltage is in fig. 2 constant voltage), it just can be made to obtain stable drain current, and this drain current flows through its electric current when being organic light-emitting diode, therefore, keep the grid voltage of transistor seconds M2 to stablize, the electric current flowing through Organic Light Emitting Diode D1 can be made more stable.

Fig. 3 is the structural representation of the another kind of image element circuit that the embodiment of the present invention provides.See Fig. 3, as one of the image element circuit in Fig. 2 preferred embodiment, voltage regulation unit 10 can comprise the first phase inverter TR1 and the first capacitor C1; The input end of described first phase inverter TR1 and the first end of described first capacitor C1 are electrically connected, and be electrically connected with the second pole M12 of described the first transistor M1, the output terminal of described first phase inverter TR1 is electrically connected with the grid of described transistor seconds M2, and second end of described first capacitor C1 is electrically connected with the 3rd signal input part S3 of image element circuit.

Particularly, first capacitor C1 plays the effect of memory capacitance, at the first transistor M1 from after opening becomes closed condition, the voltage that the first end of the first capacitor C1 stores can make transistor seconds M2 continue open and make Organic Light Emitting Diode D1 continuous illumination, by arranging the first phase inverter TR1 in voltage regulation unit 10, because secondary signal is digital signal, namely there is the voltage signal of high level and low level two kinds of voltage statuss, even if this secondary signal has unstable situation to occur, after the process of the first phase inverter TR1, stable voltage signal can be obtained, such as, in figure 3, secondary signal be not quietly or float high level signal time, after the first phase inverter TR1, stable low level signal can be obtained, in like manner, after the first transistor M1 becomes closed condition by opening, even if the voltage of the first end of the first capacitor C1 has unstable situation to occur, after the process through the first phase inverter TR1, stable voltage signal can be obtained equally, therefore, the voltage signal obtained after the first phase inverter TR1 process is applied to the grid of transistor seconds M2, can stably control transistor seconds M2, the transistor seconds M2 that can make like this to be under opening obtains stable drain current, thus the electric current flowing through Organic Light Emitting Diode D1 can be made more stable.

In figure 3,3rd signal input part S3 receives the 3rd signal, 3rd signal can be constant high level signal or constant low level signal, and the level value of described constant high level signal can be 5V to 15V, and the level value of described constant low level signal can be-15V to-5V.But, also according to actual design or needs, the level value of constant high level signal and the level value of constant low level signal can be selected.Except the 3rd signal being applied to except second end of the first capacitor C1 by the 3rd signal input part S3 shown in Fig. 3, also can by the second termination first power supply PVDD or second source PVEE of the first capacitor C1, apply power supply signal namely to second end of the first capacitor C1, wherein the magnitude of voltage of the first power supply PVDD can be 3V to 7V, the magnitude of voltage of second source PVEE can get negative value usually, also according to actual design or needs, the magnitude of voltage of corresponding power supply can be selected.In addition, apply other constant voltage signal also can to second end of the first capacitor C1, in this no limit.

Constant voltage signal is applied by giving second end of the first capacitor C1, under the first transistor M1 is in opening, secondary signal is after the anti-phase process of the first phase inverter TR1, be applied to the grid of transistor seconds M2, transistor seconds M2 is opened and drives Organic Light Emitting Diode D1 luminous, meanwhile, secondary signal can be charged to the first end of the first capacitor C1, and makes the voltage of first end reach secondary signal to recharge here the voltage in stage; At the first transistor M1 under opening becomes closed condition, the voltage of the first end of the first capacitor C1 can continue transistor seconds M2 is opened and drive Organic Light Emitting Diode D1 luminous.

Fig. 4 is the structural representation of another image element circuit that the embodiment of the present invention provides.See Fig. 4, as the image element circuit in Fig. 2 another preferred embodiment, voltage regulation unit 10 can comprise latch, wherein, described latch comprise reverse parallel connection electrical connection the second phase inverter TR2 and the 3rd phase inverter TR3; The first end F1 of described latch is electrically connected with the second pole M12 of described the first transistor M1, and the second end F2 of described latch is electrically connected with the grid of described transistor seconds M2.

Particularly, the latch be electrically connected to form by the second phase inverter TR2 and the 3rd phase inverter TR3 reverse parallel connection, after the second phase inverter TR2 outputs signal, 3rd phase inverter TR3 by this output signal after anti-phase process, feed back to the input end of the second phase inverter TR2, make the level of the input end of the second phase inverter TR2 and the voltage signal of output terminal remain contrary; When the first transistor M2 closes, due to the effect of the 3rd phase inverter TR3, the input end of the second phase inverter TR2 continues there is voltage signal, and therefore, the latch role in Fig. 4 is identical with the first capacitor C1 role with the first phase inverter TR1 in Fig. 3.

Under the first transistor M1 is in opening, secondary signal is through the second phase inverter TR2, because secondary signal is digital signal, namely there is the voltage signal of high level and low level two kinds of voltage statuss, even if this secondary signal has unstable situation to occur, after the process through the second phase inverter TR2, stable voltage signal can be obtained, in like manner, after the first transistor M1 becomes closed condition by opening, even if the voltage of the input end of the second phase inverter TR2 has unstable situation to occur, after the process through the second phase inverter TR2, stable voltage signal can be obtained equally, therefore, the voltage signal obtained after the second phase inverter TR2 process is applied to the grid of transistor seconds M2, can stably control transistor seconds M2, the transistor seconds M2 that can make like this to be under opening obtains stable drain current, thus the electric current flowing through Organic Light Emitting Diode D1 can be made more stable.

After the first transistor M1 becomes closed condition by opening, in order to enable the first end F1 of the latch in Fig. 4 have the voltage signal more continued, can a capacitor be set in pixel single channel.Fig. 5 is the structural representation of another image element circuit that the embodiment of the present invention provides.See Fig. 5, on the basis of Fig. 4, voltage regulation unit can also comprise the second capacitor C2, and the described first end of the second capacitor C2 is electrically connected with the first end F1 of described latch, and second end of described second capacitor C2 is electrically connected with the 3rd signal input part S3 of image element circuit.About the principle of work of the second capacitor C2, please refer to the associated description of the principle of work of the first capacitor C1 in Fig. 3, therefore not to repeat here.

In Figure 5,3rd signal input part S3 receives the 3rd signal, 3rd signal can be constant high level signal or constant low level signal, and the level value of described constant high level signal can be 5V to 15V, and the level value of described constant low level signal can be-15V to-5V.But, also according to actual design or needs, the level value of constant high level signal and the level value of constant low level signal can be selected.Except the 3rd signal being applied to except second end of the second capacitor C2 by the 3rd signal input part S3 shown in Fig. 5, also can by the second termination first power supply PVDD or second source PVEE of the second capacitor C2, apply power supply signal namely to second end of the second capacitor C2, wherein the magnitude of voltage of the first power supply PVDD can be 3V to 7V, the magnitude of voltage of second source PVEE can get negative value usually, also according to actual design or needs, the magnitude of voltage of corresponding power supply can be selected.In addition, apply other constant voltage signal also can to second end of the second capacitor C2, in this no limit.

It should be noted that, in the image element circuit shown in above-mentioned Fig. 2 to Fig. 5, the first transistor M1 is NMOS tube, transistor seconds M2 is PMOS, wherein, when the first signal is the voltage signal of high level, the first transistor M1 opens, when first signal is low level voltage signal, the first transistor M1 closes; When after voltage regulation unit 10 processes, the digital signal of gained is low level voltage signal, transistor seconds M2 opens, and when the digital signal of gained is the voltage signal of high level, transistor seconds M2 closes.This is only the embodiment chosen the type of the first transistor and transistor seconds, in another embodiment, the first transistor and transistor seconds can be all NMOS tube, now, when first signal is the voltage signal of high level, the first transistor M1 opens, otherwise then the first transistor M1 closes, and when after voltage regulation unit 10 processes, the digital signal of gained is the voltage signal of high level, transistor seconds M2 opens, otherwise then transistor seconds M2 closes; Or the first transistor and transistor seconds can be all PMOS, now, when first signal is low level voltage signal, the first transistor M1 opens, otherwise then the first transistor M1 closes, and when after voltage regulation unit 10 processes, the digital signal of gained is low level voltage signal, transistor seconds M2 opens, otherwise then transistor seconds M2 closes; Or the first transistor can be PMOS, and transistor seconds can be NMOS tube, now, when the first signal is low level voltage signal, the first transistor M1 opens, otherwise, then the first transistor M1 closes, and when after voltage regulation unit 10 processes, the digital signal of gained is the voltage signal of high level, transistor seconds M2 opens, otherwise then transistor seconds M2 closes.In the actual design of image element circuit, can choose the type of the first transistor and transistor seconds as required, as long as correspondingly arrange the first signal and secondary signal, the type of the first transistor and transistor seconds not limited at this.

The embodiment of the present invention also provides a kind of array base palte.Fig. 6 is the structural representation of a kind of array base palte that the embodiment of the present invention provides.See Fig. 6, described array base palte comprises: scan drive circuit 21, data drive circuit 22, m bar sweep trace (S1, S2 ..., Sm), n bar data line (D1, D2 ..., Dn) and multiple image element circuit 23; Wherein, the structure of described image element circuit 23 adopts the image element circuit described in each embodiment above-mentioned, does not repeat them here.

Particularly, the scan drive circuit 21 shown in Fig. 6, for each bar sweep trace (S1, S2 ..., Sm) sweep signal is provided; Data drive circuit 22, for pieces of data line (D1, D2 ..., Dn) data-signal is provided; Image element circuit 23 is separately positioned in the pixel region that sweep trace and data line intersect to form, wherein, first signal input part of each image element circuit 23 is electrically connected with corresponding sweep trace, the first signal that this first signal input part receives is sweep signal, the secondary signal input end of each image element circuit 23 is electrically connected with corresponding data line, and the secondary signal that this secondary signal input end receives is data-signal.

The embodiment of the present invention also provides a kind of display panel.Fig. 7 is the structural representation of a kind of display panel that the embodiment of the present invention provides.See Fig. 7, described display panel comprises: first substrate 31 and the second substrate 32 be oppositely arranged with first substrate 31, wherein, described first substrate 31 can be color membrane substrates, packaged glass (Cover Glass) or cover-plate glass (Cover Lens) etc., and described second substrate 32 is the array base palte described in above-described embodiment.

It should be noted that, above-mentioned display panel can have touch controllable function, also can not have touch controllable function, when actual fabrication, can carry out Choice and design according to concrete needs.Wherein, touch controllable function can be electromagnetic touch function, capacitive touch function or electromagnetism capacitive touch function etc.

Above-mentioned display panel adopt drive driving tube by digital signal and and then control the luminescence of Organic Light Emitting Diode or stop luminous image element circuit, such display panel can be used for making display device or the electronic equipment of less than 3.5 cun, wrist-watch etc.

The embodiment of the present invention also provides a kind of driving method of image element circuit, and this driving method can be performed by the image element circuit described in each embodiment above-mentioned.Fig. 8 is the schematic flow sheet of the driving method of a kind of image element circuit that the embodiment of the present invention provides.As shown in Figure 8, the driving method of image element circuit comprises:

S41, the first signal control the first transistor and open, and the signal that secondary signal exports after voltage regulation unit process controls transistor seconds and opens, and makes organic light-emitting diode;

S42, described first signal control described the first transistor and close, and open, make described organic light-emitting diode through transistor seconds described in the signal Sustainable Control that described voltage regulation unit exports;

S43, described first signal control described the first transistor and open, and the signal that described secondary signal exports after described voltage regulation unit process controls described transistor seconds and closes, and described Organic Light Emitting Diode are stopped luminous.

Because the driving method of described image element circuit can be performed by the image element circuit described in each embodiment above-mentioned, therefore, in order to this driving method can be understood better, next, just for the image element circuit shown in Fig. 3, and the oscillogram of the voltage signal that the first signal input part and secondary signal input end receive in this image element circuit shown in composition graphs 9, described driving method is described further.About other each embodiment of image element circuit, about the associated description of the image element circuit shown in Fig. 3 below please refer to, do not repeat them here.Wherein, in fig .9, SS1 represents the first signal that the first signal input part receives, and SS2 represents the secondary signal that secondary signal input end receives.

See Fig. 3 and Fig. 9, in the T1 stage, first signal SS1 of high level controls the first transistor M1 and opens, the first transistor M1 of secondary signal SS2 through opening of high level, be transferred to the first end of the first capacitor C1 and the input end of the first phase inverter TR1, after the anti-phase process of the first phase inverter TR1, obtain low level voltage signal, this voltage signal controls transistor seconds M2 and opens, first power supply PVDD and Organic Light Emitting Diode D1 conducting, make Organic Light Emitting Diode D1 luminous, meanwhile, the first end of secondary signal to the first capacitor C1 of high level charges, and make its first end obtain the voltage of secondary signal.

In the T2 stage, the first signal SS1 becomes low level by the high level in T1 stage, and the first transistor M1 is closed, and secondary signal SS2 becomes low level by the high level in T1 stage, but can not be transferred to the input end of the first phase inverter TR1; In this stage, the first end of the first capacitor C1 provides voltage signal for the input end of the first phase inverter TR1, this voltage signal is high level, after anti-phase process by the first phase inverter TR1, obtain low level voltage signal, this voltage signal controls transistor seconds M2 and opens, thus makes Organic Light Emitting Diode D1 can be luminous constantly.

In the T3 stage, first signal SS1 becomes high level by the low level in T2 stage, control the first transistor M1 to open, secondary signal SS2 still keeps low level during T2 stage, and be transferred to the first end of the first capacitor C1 and the input end of the first phase inverter TR1 by the first transistor M1, after the anti-phase process of the first phase inverter TR1, obtain the voltage signal of high level, this voltage signal controls transistor seconds M2 and closes, thus make Organic Light Emitting Diode D1 luminous, meanwhile, the first end of low level secondary signal to the first capacitor C1 charges, and make its first end obtain the voltage of secondary signal.

It should be noted that, secondary signal is digital signal, and namely secondary signal is the voltage signal with high level and low level two kinds of voltage statuss, at above-mentioned T1, in T2 and the T3 stage, owing to being subject to the capacitive coupling of image element circuit periphery, leak electricity or in a frame display, occur the reasons such as decay and make the voltage of secondary signal or the first capacitor first end produce wild effect, after process by the first phase inverter TR1, stable voltage signal can be become, this voltage signal applies the grid of transistor seconds M2, can stably control transistor seconds M2, the transistor seconds M2 that can make like this to be under opening obtains stable drain current, thus the electric current flowing through Organic Light Emitting Diode D1 can be made more stable.

The image element circuit that the embodiment of the present invention provides and driving method thereof, array base palte and display panel, by arranging voltage regulation unit between second pole and the grid as the transistor seconds of driving tube of the first transistor, the secondary signal that secondary signal input end receives, even if due to the capacitive coupling being subject to image element circuit periphery, leak electricity or in a frame display, occur the reasons such as decay and produce instability, after voltage regulation unit, stable voltage signal can be obtained, this voltage signal applies the grid of transistor seconds, can stably control transistor seconds, the transistor seconds that can make like this to be under opening obtains stable drain current, make the electric current flowing through Organic Light Emitting Diode more stable, thus the display effect of display panel can be improved.

Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.

Claims (11)

1. an image element circuit, is characterized in that, comprising: the first transistor, transistor seconds, Organic Light Emitting Diode and voltage regulation unit;
The grid of described the first transistor is electrically connected with the first signal input part of image element circuit, and the first pole is electrically connected with the secondary signal input end of image element circuit, and the second pole is electrically connected with the grid of described transistor seconds by described voltage regulation unit;
First pole of described transistor seconds is connected with the first power electric, and the second pole is electrically connected with the anode of described Organic Light Emitting Diode;
The negative electrode of described Organic Light Emitting Diode is electrically connected with second source, and the voltage of wherein said second source is less than the voltage of described first power supply;
Wherein, described voltage regulation unit is stablized for keeping the current potential of the grid being applied to described transistor seconds.
2. image element circuit according to claim 1, is characterized in that, described voltage regulation unit comprises the first phase inverter and the first capacitor;
The input end of described first phase inverter and the first end of described first capacitor are electrically connected, and be electrically connected with the second pole of described the first transistor, the output terminal of described first phase inverter is electrically connected with the grid of described transistor seconds, and the second end of described first capacitor is electrically connected with the 3rd signal input part of described first power supply, described second source or image element circuit.
3. image element circuit according to claim 1, is characterized in that, described voltage regulation unit comprises latch, and wherein, described latch comprises the second phase inverter and the 3rd phase inverter of reverse parallel connection electrical connection;
The first end of described latch is electrically connected with the second pole of described the first transistor, and the second end of described latch is electrically connected with the grid of described transistor seconds.
4. image element circuit according to claim 3, it is characterized in that, described voltage regulation unit also comprises the second capacitor, the first end of described second capacitor is electrically connected with the first end of described latch, and the second end of described second capacitor is electrically connected with the 3rd signal input part of described first power supply, described second source or image element circuit.
5. the image element circuit according to claim 2 or 4, is characterized in that, described 3rd signal input part receives the 3rd signal, and described 3rd signal is constant high level signal or constant low level signal.
6. the image element circuit according to any one of claim 1-4, is characterized in that, described first signal input part receives the first signal, and described first signal is pulse signal;
Described secondary signal input end receives secondary signal, and described secondary signal is digital signal.
7. the image element circuit according to any one of claim 1-4, is characterized in that, described the first transistor is NMOS tube or PMOS.
8. the image element circuit according to any one of claim 1-4, is characterized in that, described transistor seconds is NMOS tube or PMOS.
9. an array base palte, is characterized in that, comprises the image element circuit according to any one of claim 1-8.
10. a display panel, is characterized in that, comprises array base palte as claimed in claim 9.
The driving method of 11. 1 kinds of image element circuits, the image element circuit of described driving method according to any one of claim 1-8 performs, and it is characterized in that, comprising:
First signal controls the first transistor and opens, and the signal that secondary signal exports after voltage regulation unit process controls transistor seconds and opens, and makes organic light-emitting diode;
Described first signal controls described the first transistor and closes, and opens, make described organic light-emitting diode through transistor seconds described in the signal Sustainable Control that described voltage regulation unit exports;
Described first signal controls described the first transistor and opens, and the signal that described secondary signal exports after described voltage regulation unit process controls described transistor seconds and closes, and described Organic Light Emitting Diode is stopped luminous.
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