CN103325339B - Image element circuit and driving method thereof, organic electroluminescence display panel and display unit - Google Patents

Image element circuit and driving method thereof, organic electroluminescence display panel and display unit Download PDF

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Publication number
CN103325339B
CN103325339B CN201310250040.7A CN201310250040A CN103325339B CN 103325339 B CN103325339 B CN 103325339B CN 201310250040 A CN201310250040 A CN 201310250040A CN 103325339 B CN103325339 B CN 103325339B
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described
transistor
connected
driving transistors
signal input
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CN201310250040.7A
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Chinese (zh)
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CN103325339A (en
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青海刚
祁小敬
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412Digitisers structurally integrated in a display
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G09G3/3241Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0404Matrix technologies
    • G09G2300/0417Special arrangements specific to the use of low carrier mobility technology
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0819Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243Details of the generation of driving signals
    • G09G2310/0251Precharge or discharge of pixel before applying new pixel voltage
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00Aspects of interface with display user

Abstract

The invention provides a kind of image element circuit and driving method thereof, organic electroluminescence display panel and display unit, wherein, in this image element circuit, be provided with driving transistors, the first electric capacity, Organic Light Emitting Diode, the first control module and driver element, this image element circuit is by being directly inputted to data voltage the grid of driving transistors, the grid potential of driving transistors is fixed, utilize the self discharge of memory capacitance that the threshold voltage of driving transistors is kept in memory capacitance simultaneously, in an electrode of memory capacitance, introduce fixed potential and eliminate the impact of circuit internal resistance on glow current, thereby improve the inhomogeneities of panel picture disply.

Description

Image element circuit and driving method thereof, organic electroluminescence display panel and display unit

Technical field

The present invention relates to organic light emitting display field, relate in particular to a kind of image element circuit and driving method thereof, organic electroluminescence display panel and display unit.

Background technology

AMOLED(active matrix organic light-emitting diode: ActiveMatrixOrganicLightEmittingDiode) why can be luminous, normally by DTFT(driving transistors) drive current that produces in the time of saturation state drives.

At present, the main production method of AMOLED display floater is to utilize LTPS(low temperature polycrystalline silicon) TFT(thin film transistor (TFT)) technology makes. But, immature due to LTPS technique, even if same technological parameter, the Vth(transistor threshold voltage of the TFT of the display floater diverse location of making) also there is larger difference, Vth also has drift simultaneously.

And in existing traditional AMOLED drive circuit, in the drive current computing formula that DTFT produces, conventionally comprise the Vth of TFT. So described above, because the Vth of the TFT of display floater diverse location in prior art exists larger difference, cause the drive current of AMOLED under same gray scale voltage different, therefore caused display floater diverse location brightness meeting variant, caused display floater brightness homogeneity poor.

In addition, the application of touch function in various display floaters especially mobile display is more and more wider, almost become the standard configuration of Intelligent mobile equipment, existing technique is that display floater and touch panel are separately made, and then fit, such technological process makes to show the function panel complex process of touch-screen, and cost is high, is also unfavorable for the lightening of demonstration.

Summary of the invention

The invention provides a kind of image element circuit and driving method thereof, organic electroluminescence display panel and display unit, can eliminate the impact of image element circuit internal resistance on light emission drive current, can improve uniformity and the reliability of organic electroluminescence display panel brightness.

The invention provides scheme as follows:

The embodiment of the present invention provides a kind of image element circuit, comprising: driving transistors, the first electric capacity, Organic Light Emitting Diode, the first control module and driver element; Wherein:

The drain electrode of described driving transistors and the anodic bonding of described Organic Light Emitting Diode;

The negative electrode of described Organic Light Emitting Diode is connected with second electrical level signal input part;

Described the first control module is connected with the first sweep signal input, data wire, fixed voltage input, described the first electric capacity first end, the grid of described driving transistors, described driver element respectively, for under the first sweep signal control, be fixed voltage by the control of Electric potentials of described the first electric capacity first end, data voltage is inputed to the grid of described driving transistors, utilize the first electric capacity, by the self discharge of driving transistors, the current potential of first electric capacity the second end is remained to data voltage and drive transistor threshold voltage sum;

Driver element is connected with grid and source electrode, described first control module of LED control signal input, the first level signal input, described first electric capacity the second end, described driving transistors respectively, for under LED control signal control, utilize the pressure reduction at described the first electric capacity two ends as the gate source voltage of driving transistors, drive Organic Light Emitting Diode luminous.

Preferably, described the first control module comprises:

The 6th transistor and the 7th transistor; Wherein:

Described the 6th transistorized source electrode is connected with described fixed voltage input, described the 6th transistorized grid is connected with described the first sweep signal input, and described the 6th transistorized drain electrode is connected in node m with described the first electric capacity first end, driver element respectively;

The 7th transistorized source electrode is connected with described data wire, and described the 7th transistorized grid is connected with described the first sweep signal input, and described the 7th transistorized drain electrode is connected in node g with described drive transistor gate, described driver element respectively.

Preferably, described driver element comprises:

The 3rd transistor and the 5th transistor; Wherein:

Described the 3rd transistorized source electrode is connected with described the first level signal input, described the 3rd transistorized grid is connected with described LED control signal input, and described the 3rd transistorized drain electrode is connected in node n with the source electrode of described first electric capacity the second end, driving transistors respectively;

Described the 5th transistorized source electrode is connected with described node g, and described the 5th transistorized grid is connected with described LED control signal input, and described the 5th transistorized drain electrode is connected with described node m.

Preferably, described image element circuit also comprises:

For eliminating not the 4th transistor of compound carrier of described Organic Light Emitting Diode luminescent layer interface;

Described the 4th transistorized drain electrode is connected with described second electrical level signal input part, and described the 4th transistorized grid is connected with described the first sweep signal input, the anodic bonding of described the 4th transistorized source electrode and described Organic Light Emitting Diode.

Preferably, described image element circuit also comprises: induction electrode, amplifier transistor, the second electric capacity, charhing unit and the second control module; Wherein:

Described induction electrode is connected in node p with the grid of described charhing unit, the second electric capacity first end, amplifier transistor respectively;

The source electrode of described amplifier transistor is connected with described the first level input, and described second control module of drain electrode of described amplifier transistor connects;

The second end of described the second electric capacity is connected with the second sweep signal input;

Described charhing unit is connected with the first sweep signal input, the first level input and described node p respectively, under the first sweep signal control, is described the second capacitor charging;

Described the second control module is connected with the drain electrode of described the second sweep signal input, the line of induction, described amplifier transistor respectively, for under described the second sweep signal control, and amplifier transistor amplifying signal electric current is transferred to chip by the second control module is touched determining whether.

Preferably, described charhing unit comprises:

Transistor seconds;

The source electrode of described transistor seconds is connected with described the first level signal input, and the grid of described transistor seconds is connected with described the first sweep signal input, and the drain electrode of described transistor seconds is connected with described node p.

Preferably, described the second control module comprises:

The first transistor;

The source electrode of described the first transistor is connected with the drain electrode of described amplifier transistor, the grid of described the first transistor and described the second sweep signal input, and the drain electrode of described the first transistor is connected with the described line of induction.

Preferably, the transistor that described image element circuit comprises is P transistor npn npn;

Described the first level signal input is connected with high level;

Described second electrical level signal input part is connected with low level.

The embodiment of the present invention also provides a kind of image element driving method that drives the described image element circuit that the invention described above embodiment provides, and comprising:

First stage, the first control module is fixed voltage by the control of Electric potentials of the first electric capacity first end, data voltage is inputed to the grid of driving transistors, utilize the first electric capacity to make the current potential of first electric capacity the second end remain data voltage and drive transistor threshold voltage sum by the self discharge of driving transistors, driver element is in cut-off state;

Second stage, the first control module, driver element and driving transistors are all in cut-off state;

Phase III, the first control module is in cut-off state, and driver element, under LED control signal control, utilizes the pressure reduction at the first electric capacity two ends as the gate source voltage of driving transistors, drives Organic Light Emitting Diode luminous.

Preferably, in the first stage, the 6th transistor, the 7th transistor are in conducting state, and the 3rd transistor, the 5th transistor are in cut-off state;

In second stage, the 3rd transistor, the 5th transistor, the 6th transistor, the 7th transistor are all in cut-off state;

In the phase III, the 3rd transistor, the 5th transistor are in conducting state, and the 6th transistor, the 7th transistor are in cut-off state.

Preferably, in the first stage, the 4th transistor is in conducting state;

In second stage, the 4th transistor is in cut-off state;

In the phase III, the 4th transistor is in cut-off state.

Preferably, in the first stage, the first sweep signal is low level, and LED control signal is high level;

In second stage, the first sweep signal is high level, and LED control signal is high level;

In the phase III, the first sweep signal is high level, and LED control signal is low level.

Preferably, described method also comprises:

First stage, it is the second capacitor charging that charhing unit utilizes the first level signal, and amplifier transistor and the second control module are in cut-off state;

Second stage and phase III, charhing unit is in cut-off state, and the touch signal current delivery that the second control module amplifies amplifier transistor is to the line of induction.

Preferably, in the first stage, transistor seconds is in conducting state, and the first transistor is in cut-off state;

In second stage, transistor seconds in cut-off state, the first transistor in conducting state;

In the phase III, transistor seconds in cut-off state, the first transistor in conducting state.

Preferably, in the first stage, the first sweep signal is low level, and the second sweep signal is high level;

In second stage, the first sweep signal is high level, and the second sweep signal is low level;

In the phase III, the first sweep signal is high level, and the second sweep signal is low level.

The embodiment of the present invention also provides a kind of organic electroluminescence display panel, and it specifically can comprise the described image element circuit that the invention described above embodiment provides.

The embodiment of the present invention also provides a kind of display unit, and it specifically can comprise the described organic electroluminescence display panel that the invention described above embodiment provides.

Can find out from the above, image element circuit provided by the invention and driving method thereof, organic electroluminescence display panel and display unit, by arranging driving transistors, the first electric capacity, Organic Light Emitting Diode, the first control module and driver element; Described the first control module is connected with the first sweep signal input, data wire, fixed voltage input, described the first electric capacity first end, the grid of described driving transistors, described driver element respectively, for under the first sweep signal control, be fixed voltage by the control of Electric potentials of described the first electric capacity first end, utilize the first electric capacity, by driving transistors self discharge, the current potential of described first electric capacity the second end is remained to data voltage and drive transistor threshold voltage sum; Driver element is connected with grid and source electrode, described first control module of LED control signal input, the first level input, described first electric capacity the second end, described driving transistors respectively, for under LED control signal control, utilize the pressure reduction at described the first electric capacity two ends as the gate source voltage of driving transistors, drive Organic Light Emitting Diode luminous. This image element circuit is by being directly inputted to data voltage the grid of driving transistors, the grid potential of driving transistors is fixed, utilize the self discharge of memory capacitance that the threshold voltage of driving transistors is kept in memory capacitance simultaneously, in an electrode of memory capacitance, introduce fixed potential and eliminate the impact of circuit internal resistance on glow current, thereby improved the inhomogeneities of panel picture disply.

Brief description of the drawings

The image element circuit structure schematic diagram one that Fig. 1 provides for the embodiment of the present invention;

The image element circuit structure schematic diagram two that Fig. 2 provides for the embodiment of the present invention;

The image element circuit structure schematic diagram three that Fig. 3 provides for the embodiment of the present invention;

The pixel circuit drive method schematic flow sheet that Fig. 4 provides for the embodiment of the present invention;

The image element circuit driving signal timing diagram that Fig. 5 provides for the embodiment of the present invention;

The pixel circuit section schematic equivalent circuit one that Fig. 6 provides for the embodiment of the present invention;

The pixel circuit section schematic equivalent circuit two that Fig. 7 provides for the embodiment of the present invention;

The pixel circuit section schematic equivalent circuit three that Fig. 8 provides for the embodiment of the present invention;

The pixel circuit section schematic equivalent circuit four that Fig. 9 provides for the embodiment of the present invention.

Detailed description of the invention

For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing of the embodiment of the present invention, the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiment. Based on described embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain, belongs to the scope of protection of the invention.

Unless otherwise defined, technical term used herein or scientific terminology should be and in field, have the ordinary meaning that the personage of general technical ability understands under the present invention. " first ", " second " and the similar word that in patent application specification of the present invention and claims, use do not represent any order, quantity or importance, and are just used for distinguishing different parts. Equally, the similar words such as " " or " " do not represent restricted number yet, but represent to exist at least one. " connection " or " being connected " etc. similarly word be not defined in connection physics or machinery, but can comprise electrical connection, no matter be directly or indirectly. " on ", D score, " left side ", " right side " etc. are only for representing relative position relation, after being described the absolute position of object and changing, this relative position relation also correspondingly changes.

The embodiment of the present invention provides a kind of image element circuit, and as shown in Figure 1, it is specifically to comprise: driving transistors DTFT, the first capacitor CST, Organic Light Emitting Diode OLED, the first control module 11 and driver element 12; Wherein:

The anodic bonding of the drain electrode of driving transistors DTFT and Organic Light Emitting Diode OLED;

The negative electrode of Organic Light Emitting Diode OLED is connected with second electrical level signal input part;

The first control module 11, respectively with the first sweep signal G(n) input, data wire (DataLine, i.e. data voltage Vdata input), fixed voltage Vref input, the first capacitor CST, driving transistors DTFT, driver element 12 connect, under the first sweep signal control, by the first capacitor CSTThe control of Electric potentials of first end is fixed voltage Vref, data voltage Vdata is inputed to the grid of driving transistors T6, utilizes the first capacitor CSTMake the first capacitor C by the self discharge of driving transistors DTFTSTThe current potential of the second end remains data voltage Vdata and drive transistor threshold voltage Vthd sum;

Driver element 12, respectively with LED control signal EM(n) input, the first level input, the first capacitor CST, driving transistors DTFT, the first control module 11 connect, and under LED control signal control, utilizes the first capacitor CSTThe pressure reduction at two ends, as driving transistors DTFT gate source voltage, drives Organic Light Emitting Diode OLED luminous.

The image element circuit that the embodiment of the present invention provides, by directly data voltage Vdata being input to the grid of driving transistors DTFT, fixes driving transistors DTFT grid potential, utilizes memory capacitance C simultaneouslySTSelf discharge the threshold voltage vt hd of driving transistors DTFT is kept to the first capacitor CSTIn, the first capacitor CSTAn electrode in introduce fixed potential (for example fixed voltage Vref) to eliminate the impact of circuit internal resistance on glow current, thereby make the OLED drive current at diverse location place in organic electroluminescence display panel consistent, can improve uniformity and the reliability of organic electroluminescence display panel brightness.

In the present invention's one specific embodiment, as shown in Figure 2, the first control module 11 specifically can comprise:

The 6th transistor T 6 and the 7th transistor T 7; Wherein:

The source electrode of the 6th transistor T 6 is connected with fixed voltage Vref input, the grid of the 6th transistor T 6 and the first sweep signal G(n) input is connected, the drain electrode of the 6th transistor T 6 respectively with the first capacitor CSTFirst end, driver element 12 are connected in node m;

The source electrode of the 7th transistor T 7 is connected with data wire, the grid of the 7th transistor T 7 and the first sweep signal G(n) input is connected, and the drain electrode of the 7th transistor T 7 is connected in node g with driving transistors DTFT grid, driver element 12 respectively.

In the present invention's one specific embodiment, as shown in Figure 2, driver element 12 specifically can comprise:

The 3rd transistor T 3 and the 5th transistor T 5; Wherein:

The source electrode of the 3rd transistor T 3 is connected with the first level signal input, the grid of the 3rd transistor T 3 and LED control signal EM(n) input is connected, the drain electrode of the 3rd transistor T 3 respectively with the first capacitor CSTThe source electrode of the second end, driving transistors DTFT is connected in node n;

The source electrode of the 5th transistor T 5 is connected with described node g, the grid of the 5th transistor T 5 and LED control signal EM(n) input is connected, and the drain electrode of the 5th transistor T 5 is connected with described node m.

The first related level signal of the embodiment of the present invention is specifically as follows direct current high level signal VDD, can be also other regularly signals of input high level; And second electrical level signal can be direct current low level signal VSS, can be also that other can the low level signal of timing output.

In the present invention's one specific embodiment, as shown in Figure 3, the image element circuit that the embodiment of the present invention provides specifically can also comprise:

Induction electrode (SE:SenseElectrode) 13, amplifier transistor ATFT, the second capacitor CP, charhing unit 14 and the second control module 15; Wherein:

Induction electrode 13 respectively with charhing unit 14, the second capacitor CPThe grid of first end, amplifier transistor ATFT is connected in node p;

The source electrode of amplifier transistor ATFT is connected with the first level input, and drain electrode the second control module 15 of amplifier transistor ATFT connects;

The second capacitor CPThe second end and the second sweep signal G(n+1) input is connected;

Charhing unit 14 respectively with the first sweep signal G(n) input, the first level input and node p be connected, at the first sweep signal G(n) control under, for stating the second capacitor CPCharging;

The second control module 15 respectively with the second sweep signal G(n+1) drain electrode of input, the line of induction (SenseLine), amplifier transistor ATFT is connected, for at the second sweep signal G(n+1) control under, the touch signal current delivery that amplifier transistor ATFT is amplified is to the line of induction, so that chip determines whether is touched.

Visible, the image element circuit that the embodiment of the present invention provides, all right integrated touch circuit for detecting, control signal in AMOLED light emission drive circuit that this touch circuit for detecting is multiplexing, the coupling capacitance touching in circuit for detecting is charged, and utilize amplifier tube transistor (AmplifyTFT, be ATFT) amplify touching the touch signal producing, in not increasing circuit structure and Operating Complexity, well realize touch circuit integrated on panel, thereby can realize internally-arranged type touch-screen and Organic Light Emitting Diode and drive show integrated, be conducive to reduce thickness and the weight of display floater, and can reduce the cost of display floater.

In the present invention's one specific embodiment, as shown in Figure 2, charhing unit 14 specifically can comprise:

Transistor seconds T2;

Concrete, the source electrode of transistor seconds T2 is connected with the first level signal input, the grid of transistor seconds T2 and the first sweep signal G(n) input is connected, and the drain electrode of transistor seconds T2 is connected with node p.

In the present invention's one specific embodiment, as shown in Figure 2, the second control module 15 specifically can comprise:

The first transistor T1;

Concrete, the source electrode of the first transistor T1 is connected with the drain electrode of amplifier transistor ATFT, the grid of the first transistor T1 and the second sweep signal G(n+1) input, the drain electrode of the first transistor T1 is connected with the described line of induction.

In the present invention's one specific embodiment, the image element circuit that the embodiment of the present invention provides specifically can also comprise:

For eliminating not the 4th transistor T 4 of compound carrier of Organic Light Emitting Diode OLED luminescent layer interface.

Concrete, as shown in Figure 2, the drain electrode of the 4th transistor T 4 is connected with second electrical level signal input part, the grid of the 4th transistor T 4 and the first sweep signal G(n) input is connected, the anodic bonding of the source electrode of the 4th transistor T 4 and Organic Light Emitting Diode OLED.

The 4th transistor T 4 that the embodiment of the present invention is related, when opening, the first scan line make the anode of Organic Light Emitting Diode OLED be shorted to such as VSS of second electrical level input, thereby can eliminate the not compound carrier of Organic Light Emitting Diode OLED internal illumination bed boundary accumulation, reduce the built in field of Organic Light Emitting Diode OLED due to the formation of charge accumulation, delay the aging of Organic Light Emitting Diode OLED.

In an alternate embodiment of the present invention, the transistor that the invention described above embodiment is related, comprises the first transistor T1 to the seven transistor Ts 7, and driving transistors DTFT, amplifier transistor ATFT, specifically all can be P transistor npn npn, and source in above-mentioned transistor, drain interchangeable.

The embodiment of the present invention also provides a kind of pixel circuit drive method that drives the image element circuit that the invention described above embodiment provides. As shown in Figure 4, the pixel circuit drive method that the embodiment of the present invention provides specifically can comprise:

Step 41, i.e. the first stage, the first control module 11 is by the first capacitor CSTThe control of Electric potentials of first end is fixed voltage Vref, data voltage Vdata is inputed to the grid of driving transistors DTFT, utilizes the first capacitor CSTMake the first capacitor C by driving transistors DTFT self dischargeSTThe current potential of the second end remains data voltage Vdata and driving transistors DTFT threshold voltage vt hd sum, and driving transistors DTFT is in conducting state, and driver element 12 is in cut-off state;

Step 42, i.e. second stage, the first control module 11, driver element 12 and driving transistors DTFT are all in cut-off state;

Step 43, i.e. the phase III, the first control module 11 is in cut-off state, driver element 12 is at LED control signal EM(n) control under, utilize the first capacitor CSTThe pressure reduction at two ends, as the gate source voltage of driving transistors DTFT, drives Organic Light Emitting Diode OLED luminous.

The pixel circuit drive method that the embodiment of the present invention provides, by directly data voltage Vdata being input to the grid of driving transistors DTFT, fixes driving transistors DTFT grid potential, utilizes the first capacitor C simultaneouslySTThe driving transistors DTFT self discharge of passing through the threshold voltage vt hd of driving transistors DTFT is kept to the first capacitor CSTIn, memory capacitance CSTAn electrode in introduce fixed potential (for example fixed voltage Vref) to eliminate the impact of circuit internal resistance on glow current, thereby make the OLED drive current at diverse location place in organic electroluminescence display panel consistent, can improve uniformity and the reliability of organic electroluminescence display panel brightness.

In the present invention's one specific embodiment, the pixel circuit drive method that the embodiment of the present invention provides specifically can also comprise the following steps:

First stage, it is the second capacitor C that charhing unit 14 utilizes the first level signalPCharging, amplifier transistor ATFT and the second control module 15 are in cut-off state;

Second stage, charhing unit 14 and amplifier transistor ATFT be in cut-off state, the second control module 15 amplifier transistor ATFT is amplified by touch signal current delivery to the line of induction.

Phase III, charhing unit 14 is in cut-off state, and the second control module 15 and amplifier transistor ATFT are in conducting state.

Visible, the pixel circuit drive method that the embodiment of the present invention provides, control signal in all right multiplexing AMOLED light emission drive circuit, the coupling capacitance touching in circuit for detecting is charged, and utilize amplifier tube transistor (AmplifyTFT, be ATFT) amplify touching the touch signal producing, thus in driving Organic Light Emitting Diode OELD luminous, realize the detecting to touch signal.

In the present invention's one specific embodiment, the pixel circuit drive method that the embodiment of the present invention provides specifically can also comprise the following steps:

In the first stage, the 4th transistor T 4 is in conducting state;

In second stage, the 4th transistor T 4 is in cut-off state;

In the phase III, the 4th transistor T 4 is in cut-off state.

The pixel circuit drive method that the embodiment of the present invention provides, when opening, the first scan line make the anode of Organic Light Emitting Diode OLED be shorted to such as VSS of second electrical level input, thereby can eliminate the not compound carrier of Organic Light Emitting Diode OLED internal illumination bed boundary accumulation, reduce the built in field of Organic Light Emitting Diode OLED due to the formation of charge accumulation, delay the aging of Organic Light Emitting Diode OLED.

Below, the sequential chart shown in 5 by reference to the accompanying drawings, the specific implementation process of the pixel circuit drive method that the embodiment of the present invention is provided is described.

In this embodiment, the first level signal is VDD, and second electrical level signal is VSS.

The specific implementation process of this embodiment can comprise:

In the first stage: the first sweep signal G (n) is low level, the second sweep signal G (n+1) is high level, LED control signal EM (n) is high level, transistor seconds T2, the 6th transistor T 6, the 7th transistor T 7 is opened in conducting state, the first transistor T1, the 3rd transistor T 3, the 5th transistor T 5 is closed in cut-off state, the drain electrode of amplifier transistor ATFT is in off state, the first level signal VDD is the second capacitor C p charging by transistor seconds T2 to coupling capacitance, now another utmost point of the second capacitor C p electric capacity is that the current potential of node q is that the current potential of the second sweep signal G (n+1) is high level VGH. now the part equivalent circuit diagram of image element circuit can be as shown in Figure 6, and wherein direction shown in arrow is the sense of current.

And due to the first capacitor C st normal when luminous the current potential of n node be the first level signal VDD, after the 3rd transistor T 3 is closed, the grid potential of driving transistors DTFT is fixed as the data voltage Vdata of data wire (Dataline) input, still in certain opening, therefore the n node of the first capacitor C st can discharge by driving transistors DTFT, until the current potential of n node drops to data voltage Vdata and driving transistors TDTFTThreshold voltage | Vthd| sum, due to the 6th transistor T 6 conducting states, the current potential of the m node of the first capacitor C st is fixed as fixed potential Vref always, therefore the voltage at the first last two ends of capacitor C st is: Vcst=Vn-Vm=Vdata+|Vthd|-Vref; And the voltage at the second capacitor C p two ends is: Vcp=Vp-Vq=VDD-VGH. Now the part equivalent circuit diagram of image element circuit can be as shown in Figure 7.

Simultaneously because the 4th transistor T 4 is in conducting state, the anode of Organic Light Emitting Diode OLED is connected with second electrical level signal VSS, being present in hole transmission layer/luminescent layer (or luminescent layer/electron transfer layer) interface in glow phase has like this accumulated not compound unnecessary hole (or electronics) and has been consumed, reduce the built in field of Organic Light Emitting Diode OLED due to the formation of charge accumulation, delay the aging of OLED.

Second stage: the first sweep signal G (n) saltus step is high level, the second sweep signal G (n+1) voltage jump is low level, LED control signal EM (n) is still high level, therefore, the first transistor T1 and amplifier transistor ATFT are in conducting state, transistor seconds T2 to the seven transistor Ts 7 are all in cut-off state, driving transistors DTFT. Due to transistor seconds T2 cut-off, the second capacitor C p electric capacity p point is unsettled, therefore in the time that the second sweep signal G (n+1) jump in potential is low level, by the coupling of the second capacitor C p, node p is that the grid potential of amplifier transistor ATFT also can be followed downward saltus step. How many as for saltus step, in two kinds of situation, if there is finger (Finger) to touch, owing to can forming coupling capacitance Cf between finger and induction electrode SE, the current potential that therefore p is ordered is:

Vp=VDD+(VGL-VGH)*Cp/(Cp+Cf);

For amplifier transistor TATFTGate source voltage Vsg be:

Vsg=Vs-Vg=VDD-[VDD+(VGL-VGH)*Cp/(Cp+Cf)]=(VGH-VGL)*Cp/(Cp+Cf);

Therefore by the induced-current size of line of induction Senseline be:

Ise=Ka(Vsg-|Vtha|)2=Ka(Vsg-|Vtha|)2=Ka[(VGH-VGL)*Cp/(Cp+Cf)-|Vtha|]2

Vtha is the threshold voltage of amplifier transistor ATFT herein; Ka is the amplifier transistor ATFT constant relevant with design with technique.

If there is no finger touch, the current potential that p is ordered is:

Vp=VDD-(VGH-VGL);

For amplifier transistor TATFTGate source voltage Vsg be:

Vsg=Vs-Vg=VDD-[VDD-(VGH-VGL)]=VGH-VGL;

Induced-current size by line of induction Senseline is:

Ise=Ka(Vsg-|Vtha|)2=Ka(Vsg-|Vtha|)2=Ka[(VGH-VGL)-|Vtha|]2

Can judge by electric current whether this place has finger touch thus, touch the Isense-line in the difference between current differnce Fig. 5 causing.

Now the part equivalent circuit diagram of image element circuit can be as shown in Figure 8.

Meanwhile, the first control module 11, driver element 12 and driving transistors DTFT are all in cut-off state

Phase III: the first sweep signal G (n) is that high level, the second sweep signal G (n+1) and LED control signal EM (n) are low level, therefore, transistor seconds T2, the 4th transistor T 4, the 6th transistor T 6, the 7th transistor T 7 are in cut-off state, and the first transistor T1, the 3rd transistor T 3, the 5th transistor T 5 are in conducting state. Because the 5th transistor T 5 is opened, the 6th transistor T 6 is closed, the m point of the first capacitor C st is no longer connected with fixed potential, and be connected with the grid of driving transistors DTFT, because the grid of driving transistors DTFT is in vacant state, even if be therefore connected (because the 3rd transistor T 3 is opened) at the n of the first capacitor C st o'clock with the first level signal VDD, the voltage at the first capacitor C st two ends still can not change, for driving transistors DTFT, gate source voltage:

Vsg=Vs-Vg=Vcst=Vdata+|Vthd|-Vref;

Wherein, | Vthd| is the threshold voltage of driving transistors DTFT.

Therefore the glow current size that is Organic Light Emitting Diode OLED by the saturation current of driving transistors DTFT is:

Ioled=kd(Vsg-|Vthd|)2=k(Vdata+|Vthd|-Vref-|Vthd|)2=k(Vdata-Vref)2

Wherein, Kd is with technique and drives the relevant constant of design.

Drive current size is only relevant with fixed voltage Vref size with data voltage Vdata as can be seen here, and driving transistors TDTFTThreshold voltage | it doesn't matter for Vthd|, and this image element circuit has also overcome the impact of internal resistance on glow current simultaneously.

Now the part equivalent circuit diagram of image element circuit can be as shown in Figure 9.

The luminous driving of one-row pixels and the judgement of touch-control have been completed by the above stage.

The image element circuit providing based on the embodiment of the present invention, the embodiment of the present invention also provides a kind of organic electroluminescence display panel, and this organic electroluminescence display panel specifically can comprise the image element circuit that the invention described above embodiment provides.

The embodiment of the present invention also provides a kind of display unit, and this display unit specifically can comprise the organic electroluminescence display panel that the invention described above embodiment provides.

This display unit is specifically as follows the display unit such as liquid crystal panel, LCD TV, liquid crystal display, oled panel, OLED display, plasma display or Electronic Paper.

Image element circuit of the present invention, organic electroluminescence display panel and display unit are particularly suitable for LTPS(low temperature polycrystalline silicon technology) GOA circuit requirements under processing procedure, also applicable to the GOA circuit under amorphous silicon technology.

Image element circuit provided by the invention and driving method thereof, organic electroluminescence display panel and display unit, by directly data voltage Vdata being input to the grid of driving transistors DTFT, fix driving transistors DTFT grid potential, utilizes the first capacitor C simultaneouslySTSelf discharge the threshold voltage vt hd of driving transistors DTFT is kept to the first capacitor CSTIn, the first capacitor CSTAn electrode in introduce fixed potential (for example fixed voltage Vref) to eliminate the impact of circuit internal resistance on glow current, thereby make the OLED drive current at diverse location place in organic electroluminescence display panel consistent, can improve uniformity and the reliability of organic electroluminescence display panel brightness.

Simultaneously, in image element circuit provided by the invention, be also provided with touch signal circuit for detecting, control signal in AMOLED light emission drive circuit that this touch circuit for detecting is multiplexing, the coupling capacitance touching in circuit for detecting is charged, and utilize amplifier tube transistor (AmplifyTFT, be ATFT) touch signal of touch screen generation is amplified, in not increasing circuit structure and Operating Complexity, well realize touch circuit integrated on panel, thereby can realize internally-arranged type touch-screen and Organic Light Emitting Diode and drive show integrated, be conducive to reduce thickness and the weight of display floater, and can reduce the cost of display floater.

In addition, image element circuit provided by the invention can also be provided with for eliminating not the 4th transistor T 4 of compound carrier of Organic Light Emitting Diode OLED luminescent layer interface, when opening, the first scan line make the anode of Organic Light Emitting Diode OLED be shorted to such as VSS of second electrical level input, thereby can eliminate the not compound carrier of Organic Light Emitting Diode OLED internal illumination bed boundary accumulation, reduce the built in field of Organic Light Emitting Diode OLED due to the formation of charge accumulation, delay the aging of Organic Light Emitting Diode OLED.

Be pointed out that, the image element circuit that the embodiment of the present invention provides is applicable to the thin film transistor (TFT) of the techniques such as non-crystalline silicon, polysilicon, oxide. Meanwhile, although in above-described embodiment, be illustrated as an example of single employing P type thin film transistor (TFT) example, but foregoing circuit can also adopt single N-type thin film transistor (TFT) or CMOS pipe circuit easily instead; In addition, touch controllable function part can also be removed, change this driving touch-control circuit into pure pixel light emission drive circuit. And, although be illustrated as an example of active matrix organic light-emitting diode example in above-described embodiment, but the invention is not restricted to use the display unit of active matrix organic light-emitting diode, also can be applied to the display unit that uses other various light emitting diodes.

The above is only embodiments of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (16)

1. a pixel circuit drive method, is characterized in that, described image element circuit comprises: drive crystalPipe, the first electric capacity, Organic Light Emitting Diode, the first control module and driver element; Wherein:
The drain electrode of described driving transistors and the anodic bonding of described Organic Light Emitting Diode;
The negative electrode of described Organic Light Emitting Diode is connected with second electrical level signal input part;
Described the first control module respectively with the first sweep signal input, data wire, fixed voltage input,Described the first electric capacity, described driving transistors, described driver element connect, in the first sweep signal controlUnder system, be fixed voltage by the control of Electric potentials of described the first electric capacity first end, described in data voltage is inputed toThe grid of driving transistors, utilizes the first electric capacity to make the first electric capacity second by the self discharge of driving transistorsThe current potential of end remains data voltage and drive transistor threshold voltage sum;
Described driver element respectively with LED control signal input, the first level signal input, describedOne electric capacity, described driving transistors, described the first control module connect, in LED control signal controlUnder, utilize the pressure reduction at described the first electric capacity two ends as the gate source voltage of driving transistors, drive organic light emissionLED lighting;
Described method comprises:
First stage, the first control module is fixed voltage by the control of Electric potentials of the first electric capacity first end, by numberInput to the grid of driving transistors according to voltage, utilize the first electric capacity to make by the self discharge of driving transistorsThe current potential of first electric capacity the second end is data voltage and drive transistor threshold voltage sum, driver element inCut-off state;
Second stage, the first control module, driver element and driving transistors are all in cut-off state;
Phase III, the first control module and driving transistors are in cut-off state, and driver element is in luminous controlUnder signal controlling processed, utilize the pressure reduction at the first electric capacity two ends as the gate source voltage of driving transistors, driving hasOLED is luminous.
2. the method for claim 1, is characterized in that, described the first control module comprises:
The 6th transistor and the 7th transistor; Wherein:
Described the 6th transistorized source electrode is connected with described fixed voltage input, described the 6th transistorized gridThe utmost point is connected with described the first sweep signal input, described the 6th transistorized drain electrode respectively with described the first electricityAppearance first end, driver element are connected in first node;
The 7th transistorized source electrode is connected with described data wire, described the 7th transistorized grid and described firstSweep signal input connect, described the 7th transistorized drain electrode respectively with described drive transistor gate, instituteState driver element and be connected in Section Point.
3. method as claimed in claim 2, is characterized in that, described driver element comprises:
The 3rd transistor and the 5th transistor; Wherein:
Described the 3rd transistorized source electrode is connected with described the first level signal input, described the 3rd transistorGrid be connected with described LED control signal input, described the 3rd transistorized drain electrode is respectively with describedThe source electrode of one electric capacity the second end, driving transistors is connected in the 3rd node;
Described the 5th transistorized source electrode is connected with described Section Point, described the 5th transistorized grid and instituteState LED control signal input and connect, described the 5th transistorized drain electrode is connected with described first node.
4. the method for claim 1, is characterized in that, also comprises:
For eliminating not the 4th transistor of compound carrier of described Organic Light Emitting Diode luminescent layer interface;
Described the 4th transistorized drain electrode is connected with described second electrical level signal input part, described the 4th transistorGrid be connected with described the first sweep signal input, described the 4th transistorized source electrode and described organicThe anodic bonding of optical diode.
5. the method for claim 1, is characterized in that, also comprises: induction electrode, amplification crystalline substanceBody pipe, the second electric capacity, charhing unit and the second control module; Wherein:
Described induction electrode respectively with the grid of described charhing unit, the second electric capacity first end, amplifier transistorBe connected in the 4th node;
The source electrode of described amplifier transistor is connected with described the first level input, the leakage of described amplifier transistorExtremely described the second control module connects;
The second end of described the second electric capacity is connected with the second sweep signal input;
Described charhing unit respectively with the first sweep signal input, the first level input and the described the 4thNode connects, and under the first sweep signal control, is described the second capacitor charging;
Described the second control module respectively with described the second sweep signal input, the line of induction, described amplification crystalline substanceThe drain electrode of body pipe connects, under described the second sweep signal control, and the touch that induction electrode is sensedSignal amplifies by amplifier transistor, and amplifier transistor amplifying signal electric current is passed through to the second control moduleBeing transferred to chip is touched determining whether.
6. method as claimed in claim 5, is characterized in that, described charhing unit comprises:
Transistor seconds;
The source electrode of described transistor seconds is connected with described the first level signal input, described transistor secondsGrid be connected with described the first sweep signal input, the drain electrode of described transistor seconds and described Section fourPoint connects.
7. method as claimed in claim 5, is characterized in that, described the second control module comprises:
The first transistor;
The source electrode of described the first transistor is connected with the drain electrode of described amplifier transistor, described the first transistorGrid and described the second sweep signal input, the drain electrode of described the first transistor is connected with the described line of induction.
8. the method as described in claim 2-7 any one, is characterized in that, in described image element circuit, wrapsThe transistor of drawing together is P transistor npn npn;
Described the first level signal input is connected with high level;
Described second electrical level signal input part is connected with low level.
9. the method for claim 1, is characterized in that, in the first stage, the 6th transistor,The 7th transistor is in conducting state, and the 3rd transistor, the 5th transistor are in cut-off state;
In second stage, the 3rd transistor, the 5th transistor, the 6th transistor, the 7th transistor all inCut-off state;
In the phase III, the 3rd transistor, the 5th transistor be in conducting state, the 6th transistor, the 7thTransistor is in cut-off state.
10. the method for claim 1, is characterized in that, in the first stage, and the 4th transistor placeIn conducting state;
In second stage, the 4th transistor is in cut-off state;
In the phase III, the 4th transistor is in cut-off state.
11. methods as claimed in claim 9, is characterized in that, in the first stage, and the first sweep signalFor low level, LED control signal is high level;
In second stage, the first sweep signal is high level, and LED control signal is high level;
In the phase III, the first sweep signal is high level, and LED control signal is low level.
12. the method for claim 1, is characterized in that, also comprise:
First stage, it is the second capacitor charging that charhing unit utilizes the first level signal, amplifier transistor andTwo control modules are in cut-off state;
Second stage and phase III, charhing unit is in cut-off state, and the second control module will amplify crystalThe touch signal current delivery that pipe amplifies is to the line of induction.
13. methods as claimed in claim 12, is characterized in that, in the first stage, and transistor secondsIn conducting state, the first transistor is in cut-off state;
In second stage, transistor seconds in cut-off state, the first transistor in conducting state;
In the phase III, transistor seconds in cut-off state, the first transistor in conducting state.
14. methods as claimed in claim 13, is characterized in that, in the first stage, and the first scanning letterNumber be low level, the second sweep signal is high level;
In second stage, the first sweep signal is high level, and the second sweep signal is low level;
In the phase III, the first sweep signal is high level, and the second sweep signal is low level.
15. 1 kinds of organic electroluminescence display panels, is characterized in that, described organic electroluminescence display panel adopts instituteThe pixel circuit drive method of stating claim 1-14 any one drives.
16. 1 kinds of display unit, is characterized in that, comprise that organic light emission as claimed in claim 15 is aobviousShow panel.
CN201310250040.7A 2013-06-21 2013-06-21 Image element circuit and driving method thereof, organic electroluminescence display panel and display unit CN103325339B (en)

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